CN117998661A

CN117998661A - Communication method and device

Info

Publication number: CN117998661A
Application number: CN202211379740.1A
Authority: CN
Inventors: 李君瑶; 杨帆; 张天虹; 黄海宁
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-11-04
Filing date: 2022-11-04
Publication date: 2024-05-07
Also published as: WO2024093685A1

Abstract

The application provides a communication method and a device, relates to the technical field of communication, and can improve the communication performance of equipment. The method comprises the following steps: the first device initializes a first channel occupation time COT; the first device sends first sharing indication information to the second device, wherein the first sharing indication information is used for indicating part or all of frequency domain resources in a first frequency domain resource, and the part or all of frequency domain resources are used for sharing to the second device, and the first frequency domain resource is a frequency domain resource occupied by the first device in the first COT; or the first frequency domain resource is a frequency domain resource included in the first COT.

Description

Communication method and device

Technical Field

The present application relates to the field of communications, and in particular, to a communication method and apparatus.

Background

Currently, a terminal can access a channel for transmission. For example, the terminal may perform listen before talk (listen before talk, LBT) to access the channel. Specifically, the device performs channel detection to determine whether the channel is idle within a period of time, and when detecting that the channel is idle within a period of time, the device can access the channel and transmit the channel successfully. If the channel is occupied (the channel is not idle), the LBT fails and the device cannot access the channel for transmission.

Due to uncertainty in channel conditions, it is difficult for a terminal to access a channel in some cases. For example, in the case of poor channel environment, the terminal is likely to fail to access the channel, which affects the communication performance of the terminal.

Disclosure of Invention

The embodiment of the application provides a communication method and a communication device, which can improve the communication performance of equipment.

In order to achieve the above purpose, the application adopts the following technical scheme:

In a first aspect, the present application provides a communication method, where the method may be applied to a first device, and the first device may be a stand-alone device, or be a module, a chip, an apparatus, etc. in the device, where the method includes:

The first device initializes a first channel occupation time COT; the first device sends first sharing indication information to the second device, wherein the first sharing indication information is used for indicating part or all of frequency domain resources in a first frequency domain resource, and the part or all of frequency domain resources are used for sharing to the second device, and the first frequency domain resource is a frequency domain resource occupied by the first device in the first COT; or the first frequency domain resource is a frequency domain resource included in the first COT.

By the method, the first device can determine the shared resource range during COT sharing, so that the first device can share part or all of the resources in the shared resource range to the second device, on one hand, the resource utilization efficiency of the system can be improved, and on the other hand, the success rate of the second device accessing the channel and the communication performance can be improved.

Optionally, the frequency domain resources included in the first COT may refer to all resources in a channel where the frequency domain resources occupied in the first COT are located.

The resources occupied by the first device may refer to frequency domain resources for the first device to transmit itself or resources for sharing to other devices. Occupancy may also be replaced by reservation or selection or use or for transmission.

In the present application, the channel may be replaced with RB set.

Optionally, the part or all of the frequency domain resources refer to one or more sub-channels contained in the first frequency domain resources.

Alternatively, the information of the frequency domain resource may be indicated by the location information of the indication channel and/or the location information of the sub-channel. Wherein the location information may include at least one of: index, number, start position, end position, offset value. Wherein, the index, the starting position and the ending position can be the conceptual index or position of the physical time slot or the conceptual index or position of the logical time slot. The offset value may be an offset value relative to the COT starting slot or the starting slot of the occupied resource.

Alternatively, the index may be indicated by any of FRIV, bitmap, bit information (binary state value), and the like.

In the present application, the first device sends first sharing indication information to the second device, where the first sharing indication information is used to indicate part or all of frequency domain resources in the first frequency domain resource, which means that the first device has permission to share resources in the COT, and may be further understood as at least one of the following ways:

1. the first device may indicate to the second device a shared resource that is a portion of the frequency domain resources within the at least one first frequency domain resource.

2. The frequency domain range of the first COT is a first frequency domain resource.

3. The frequency domain range that the first device has permission to share is the first frequency domain resource.

4. The first device does not desire to share frequency domain resources other than the first frequency domain resource to other devices (e.g., the second device).

5. The second device does not expect to receive that the first device shares at least one frequency domain resource other than the first frequency domain resource

In one possible design, the first device occupies less frequency domain resources within the first COT than the first COT includes, i.e., there may be other devices that use the frequency domain resources within the first COT with the first device.

In one possible design, the first shared indication information further includes at least one of the following information: information of the shared time domain resource and identification information of the second equipment;

optionally, the identification information of the second device includes at least one of a device ID, a source ID, and a destination ID.

Wherein the shared time domain resources comprise time domain resources within the first COT. The first device does not necessarily reserve this portion of the resources, so long as the first device is within the range of the COT. Therefore, the method can be limited in COT, and the instruction can be supplemented: optionally, time domain resources are selected or reserved for the first device.

In one possible design, the frequency domain resource occupied by the first device within the first COT is a frequency domain resource occupied by the first device in a first time slot within the first COT.

In this manner, the frequency domain range of the first device's initial COT is limited to the range of the first frequency domain resource. Considering that there may be cases where multiple devices initiate COTs on different frequency domain resources of the same time slot, different devices may differ with respect to whether or not the COTs sharing condition is satisfied, whether or not to intend to share the COTs to other devices, and how to share, which may cause the sharing device to receive different COTs sharing indication information, which may cause the sharing device to fail to determine whether or not to use the shared resources, how to determine CPE, and so on. The above problem can be solved by dividing the frequency domain range of the COT, i.e. the frequency domain range that can be shared, for different initial devices.

Or in one possible design, the frequency domain resources occupied by the first device within the first COT are frequency domain resources occupied by the first device over a time slot in which the number of frequency domain resources occupied by the first device within the first COT is the minimum. In this manner, the first device can share fewer frequency domain resources to other devices. Since the frequency domain resources used by the UEs in different time slots may be different, a minimum frequency domain range is defined for each UE of the FDM, so that it is possible to avoid confusion in the co sharing authority and the indication information caused by the authority of the two UEs to the overlapped frequency domain resources.

Or the frequency domain resource occupied by the first device in the first COT is the frequency domain resource occupied by the first device on the time slot with the largest frequency domain resource occupied by the first device in the first COT. Therefore, the first device can share more frequency domain resources to other devices, transmission of the other devices by using the shared resources is facilitated, and communication performance of the other devices is improved.

In one possible design, the second frequency domain resource is a frequency domain resource occupied by the first device on a first time slot within the first COT, the third frequency domain resource is a frequency domain resource occupied by a third device on a first time slot of the initialized second COT, and the second frequency domain resource is frequency division multiplexed with the third frequency domain resource. Therefore, the resources of the first equipment and the second equipment can be subjected to frequency division multiplexing, and the frequency spectrum utilization rate of the system is improved.

In other words, the first device and the second device constitute an initial FDM, i.e., the two devices FDM on the first slot of the initial COT. Or it may be understood that the second frequency domain resource and the third frequency domain resource are located in the same time slot; or the first time slot in the first COT and the first time slot in the second COT are the same time slot.

Or the above design can be expressed as: the first COT includes first time domain resources in a time domain; the second COT including a second time domain resource in a time domain; the first time unit of the first time domain resource is the same as the first time unit of the second time domain resource. For example, the first time unit of the first time domain resource may be the first time slot of the initial COT of the first device and the first time unit of the second time domain resource may be the first time slot of the initial COT of the third device.

Therefore, aiming at the scene and the requirement of frequency division multiplexing transmission among different devices in the initial COT in a channel, the frequency domain range and the COT sharing authority of the COT of the different devices can be determined, and the COT sharing indication information of which initial device should be followed by the sharing device is definitely transmitted by using COT resources, so that the normal operation of an SL-U FDM mechanism is ensured, and the resource utilization efficiency and the channel access efficiency of the system are improved.

Alternatively, the first sharing indication information may be COT sharing indication information.

In one possible design, the fourth frequency domain resource is a frequency domain resource occupied by the first device within the first COT, and the fifth frequency domain resource is a frequency domain resource occupied by a third device within the initialized second COT;

The fourth frequency domain resource and the fifth frequency domain resource are included in a sixth frequency domain resource; the sixth frequency domain resource is used for transmission by the second device;

And/or the sixth frequency domain resource further comprises a seventh frequency domain resource, wherein the seventh frequency domain resource is located in the same channel (channel) as the fourth frequency domain resource and the fifth frequency domain resource and is different from the fourth frequency domain resource and the fifth frequency domain resource.

The fourth frequency domain resource refers to a resource which is not occupied/initialized by the device. For example, as in fig. 9B (a), taking the first device as device 1 as an example, the fourth frequency domain resource is subchannel 1 not occupied/initialized by device 1.

In the present application, the first device is mainly taken as the device 1, but the first device is not limited to the device 1, and the device 1 has the same meaning as the first device or the device 1 is an example of the first device without additional description.

The seventh resource of the sixth resources is optional. If the sixth resource does not include the seventh resource, it means that the resource acquired by the sharing device (such as the second device) from the initial device is less than or equal to the resource occupied by the initial device. In this way, the probability of resource conflicts between devices can be reduced. If the sixth resource includes the seventh resource, it means that the shared device obtains a larger resource from the initial device than the resource occupied by the initial device. Thus, the sharing device can acquire more resources, and the communication performance of the sharing device can be improved.

Optionally, the resource for transmission by the second device is located in a time domain range of the first COT and/or the second COT.

Alternatively, there may be two or more devices of the initial FDM.

Optionally, the frequency domain resources occupied by the first device and the third device are also practically applicable to the various explanation/understanding manners in the foregoing design.

Alternatively, in defining the relationship between frequency domain resources, it is not constrained whether the frequency domain resources are located in the same time slot.

In one possible design, the method further comprises: allowing the second device to transmit using the shared resource when at least one of the following conditions is satisfied:

And the first device and the third device both instruct the second device to use the shared resource for transmission through the shared indication information. All the initial devices indicate sharing to share, so that confusion caused by the fact that one initial device allows sharing and the other initial device does not allow sharing is avoided. In addition, the following can be avoided: if device 1 is shared for device 3 to transmit, the same resources are used for its own transmissions because device 2 is not allowed to share, device 2 and device 3 will collide.

Or any one of the first device and the third device instructs the second device to use the shared resource for transmission through the sharing instruction information. Thus, the shared resource can be indicated by fewer initial devices, and the signaling overhead can be reduced.

Or the first device instructs the second device to use the shared resource for transmission through the shared instruction information. In this case, the first device is a home device, and the first device performs COT sharing by collectively instructing one home device among the plurality of initial devices, so that resource conflicts between the devices can be reduced as much as possible.

Allowing the second device to transmit using the shared resource may also be expressed as: the first device may receive a transmission sent by the second device on the shared resource. Accordingly, the second device may be described from the perspective of the opposite second device as allowing transmission on the shared resource or the second device may be transmitting on the shared resource.

In one possible design, the first device is a home device, the first device satisfying at least one of the following first conditions:

the first device is a device that first reserves resources among a plurality of initial devices.

The first device is a device which reserves resources in the mode of transmitting MCSt according to a plurality of continuous time slots first in the plurality of initial devices. In this way, considering that when a device reserves more slots, there may be a need to share resources to other devices, a device that reserves or selects more slots may be considered a home device.

The first device is a device with the reserved resource having the longest duration in the time domain among the plurality of initial devices. In this way, considering that when a device reserves more slots, there may be a need to share resources to other devices, a device that reserves or selects more slots may be considered a home device.

The first device is a device that allows sharing of resources to other devices.

The first device is the device of the plurality of initial devices having the highest channel access priority CAPC. Optionally CAPC is indicated in the SCI at reservation, or CAPC of the initial COT, or SCI of the first slot within the transmitted COT, or in the COT sharing information.

The first device is a device with highest physical layer priority among the plurality of initial devices. Optionally, the physical layer priority may also be called traffic priority.

The first device is a device with the longest channel occupation duration COT in the plurality of initial devices. In this way, considering that when a device reserves more slots, there may be a need to share resources to other devices, a device that reserves or selects more slots may be considered a home device.

The first device is the device with the lowest index of sub-channel occupation in the plurality of initial devices, the first device is the device with the longest cyclic prefix extension CPE in the plurality of initial devices, the first device is the device with the largest sub-channel occupation in the plurality of initial devices, and the first device is the device with L1 priority in the plurality of initial devices;

Wherein the plurality of initial devices includes the first device and the third device.

In one possible design, the first device instructs the second device to use the shared resource for transmission through the shared indication information, and the first device does not exclude the time-frequency domain resource of the second device when selecting the resource.

In one possible design, the third device excludes the time-frequency domain resource of the second device (i.e. selects or reserves other frequency domain resources of the time slot in which the second device is located) when the third device selects the resource, without the first device indicating, through the shared indication information, that the second device uses the shared resource for transmission.

In this way, in different scenarios, the first device can exclude or not exclude resources of the second device through the resource selection process so as not to generate a resource collision with the second device.

In one possible design, sending the first shared indication information to the second device includes:

when the second condition is met, the first sharing indication information is sent;

The second condition includes at least one of the following conditions:

the channel access priority of the second device is higher than that of the first device and/or the third device;

the second device is multicast or broadcast in the broadcast type, and the target device comprises the first device and the third device;

The target device of the second device comprises at least one of the first device and the third device;

The access channel priority of the second device is higher than that of the first device; in this manner, the first device is a home device;

the target device of the second device comprises the first device, which in this design is a home device.

Thus, the first device can share the resources in the COT to the second device under the second condition so as to improve the communication performance of the second device.

In one possible design, the time domain resource included in the first COT is a first time domain resource, the time domain resource included in the second COT is a second time domain resource, the duration of the first time domain resource is longer than the duration of the second time domain resource, any frequency domain resource on a third time domain resource may be shared by the first device to the second device, where the third time domain resource is a resource that is not overlapped in the time domain between the first time domain resource and the second time domain resource.

Thus, for the resources of the first device and the second device, which do not overlap in time domain resources, the COT sharing authority of the frequency domain resources belongs to more devices (such as the first device) of the time domain resources. Thus, the number of shared resources can be increased, which contributes to improving the communication performance of the shared device.

In a second aspect, a communication method is provided, which is applicable to a second device, and the second device may be a stand-alone device, or be a module, a chip, an apparatus, etc. in the device, where the method includes:

The second equipment receives first sharing indication information from the first equipment, wherein the first sharing indication information comprises information of part or all of frequency domain resources in first frequency domain resources, and the part or all of frequency domain resources are used for sharing the frequency domain resources to the second equipment for transmission, and the first frequency domain resources are frequency domain resources occupied by the first equipment in an initial first COT; or the first frequency domain resource is a frequency domain resource included in the first COT;

The second device transmits on the portion or all of the resources.

In one possible design, the frequency domain resource occupied by the first device within the first COT is a frequency domain resource occupied by the first device in a first time slot within the first COT; or the first equipment occupies the frequency domain resources on the time slot with the least frequency domain resources occupied in the first COT; or the first device occupies the frequency domain resources on the time slot with the largest frequency domain resources occupied in the first COT.

In one possible design, the second frequency domain resource is a frequency domain resource occupied by the first device on a first time slot within the first COT, the third frequency domain resource is a frequency domain resource occupied by a third device on a first time slot of the initialized second COT, and the second frequency domain resource is frequency division multiplexed with the third frequency domain resource.

In one possible design, the method further comprises:

The second device receives second sharing indication information from the first device; the second shared indication information includes information of a fourth frequency domain resource, which is a frequency domain resource occupied by the first device within the first COT,

The second device receives third sharing indication information from the third device; the third sharing indication information comprises information of a fifth frequency domain resource, wherein the fifth frequency domain resource is a frequency domain resource occupied by third equipment in the initialized second COT;

the second device transmits on the fourth frequency domain resource and the fifth frequency domain resource.

In one possible design, the fourth frequency domain resource and the fifth frequency domain resource are included in a sixth frequency domain resource; the sixth frequency domain resource is used for transmission by the second device; and/or the sixth frequency domain resource further comprises a seventh frequency domain resource, wherein the seventh frequency domain resource is located in the same channel (channel) as the fourth frequency domain resource and the fifth frequency domain resource and is different from the fourth frequency domain resource and the fifth frequency domain resource.

In one possible design, the method further comprises: the second device may transmit using the shared resource when at least one of the following conditions is satisfied:

Receiving sharing indication information from the first device and the third device, wherein the sharing indication information is used for indicating the second device to use shared resources for transmission; optionally, the sharing indication information of the first device and the third device is used to indicate the fourth frequency domain resource and the fifth frequency domain resource, respectively;

receiving sharing indication information from any one of the first device and the third device;

the sharing indication information is received from the first device, in such a way that the first device is a home device.

Optionally, the receiving the sharing indication information may be understood that the first device or the third device indicates that the second device allows transmission using the shared resource.

In the present application, the sharing instruction information, the COT sharing instruction information, the first sharing instruction information, the second sharing instruction information, and the like may be replaced with each other.

In one possible design, the first device satisfies at least one of the following first conditions:

The first device is a device which reserves resources first in a plurality of initial devices, the first device is a device which reserves resources first in the plurality of initial devices according to a mode of transmitting MCSt in a plurality of continuous time slots, the first device is a device which reserves resources and has the longest duration in a time domain in the plurality of initial devices, and the first device is a device which allows the resources to be shared to other devices;

wherein the plurality of initial devices includes the first device and the third device. In this manner, the first device is a home device.

In one possible design, the second device instructs the fourth device to use the shared resource for transmission through the shared indication information, where the second device does not exclude the time-frequency domain resource of the fourth device when selecting the resource.

In one possible design, receiving the first shared indication information includes:

when the second condition is met, receiving the first sharing indication information;

The second condition includes at least one of the following conditions:

The access channel priority of the second device is higher than that of the first device;

the target device of the second device comprises the first device.

In a third aspect, a communication method is provided, the method being applicable to a first device, the first device being a stand-alone device, or being a module, chip, apparatus or the like in a device, the method comprising:

The method comprises the steps that a first device determines CPE information, determines a starting position and/or a channel access type of transmission according to the CPE information, and performs channel access according to the starting position and/or the channel access type of the transmission.

In this way, the CPE can be flexibly configured for the first device, so that the probability of resource collision between devices can be reduced, and the flexibility of adopting different CPEs and/or corresponding LBT types between different devices or different transmissions is increased.

In one possible design, the first device determines CPE information comprising: the first device obtains first information, where the first information is used to determine CPE information. Optionally, the first device receives second indication information for indicating CPE information.

Optionally, different access types associate different first information and/or different time slots associate different first information.

In this way, different CPEs can be flexibly configured for the equipment according to different situations, such as different time-domain patterns or types 1/types 2, so that the probability of resource collision between the equipment can be reduced, and the flexibility of adopting different CPEs and/or corresponding LBT types between different equipment or different transmissions is increased.

In one possible design, the first device determines CPE information comprising: the first CPE determines, when at least one of a first condition is satisfied, the first CPE determines from second information, the second information being configured or preconfigured, the first condition comprising: the first transmission is CG transmission; or the first transmission is a primary transmission; or FDM is not allowed in the resource pool; or no other transmission is performed on other frequency domain resources on the time slot where the resource of the first transmission is located; or the resources of the first transmission include all of the frequency domain resources within the channel.

Thus, the first device may determine the CPE in different manners under different situations/scenarios, increasing flexibility.

In one possible design, the first device determines CPE information comprising: the first device receives third information and/or fourth information; the first device determines the CPE information according to the third information and/or the fourth information; the third information is used for indicating CPE information by the second equipment, and the fourth information is used for indicating CPE information by the third equipment.

In one possible design, the CPE information indicated by the third information is CPE applicable to the initial COT of the second device or to resources reserved by the second device, or the CPE information includes: CPE associated with the initial COT of the second device or a time slot within a resource reserved by the second device.

In one possible design, CPE information may be indicated separately per time slot, which may be the same or different.

In one possible design, the CPE information indicated by the fourth information is a CPE applicable to the third device initial COT or a resource reserved by the third device, or the CPE information includes a CPE associated with a time slot within the third device initial COT or a resource reserved by the third device. Alternatively, each time slot indicates a CPE, respectively, and may be the same or different.

In this way, the first device may dynamically indicate CPE information, and different sharing devices may determine CPE according to the indication, increasing flexibility in taking different CPE and/or corresponding LBT type between different devices or different transmissions.

In a fourth aspect, a communication method is provided, the method being applicable to a network device or an initial device, where the network device or the initial device may be a stand-alone device, or a module, a chip, an apparatus, etc. in the device, the method comprising:

and sending second indicating information, wherein the second indicating information is used for indicating CPE information. CPE information is used to determine the starting location of the transmission and/or the channel access type. CPE information is CPE that may be used to determine a resource pool and/or to determine CPE within a COT

Optionally, CPE information is carried on at least one of RRC, first level or second level SCI.

Alternatively, CPE information may be indicated separately per time slot, which may be the same or different.

In a fifth aspect, a communication method is provided, the method being applicable to a first device, which may be a stand-alone device, or a module, chip, apparatus, etc. in a device, the method comprising:

The first device initiates a first COT that transmits the first S-SSB in the selected or reserved resource, or in the COT initiated according to the selected or reserved resource.

In one possible design, before the sending the first S-SSB, it is determined that at least one of the following conditions is satisfied:

Mode 1 (condition 1): the resources selected or reserved by the first device include all frequency domain resources in the channel.

That is, when the resource of the device 1 does not form FDM with the resource of the other device, the device 1 is allowed to transmit S-SSB on the resource. In this way, no other devices FDM with device 1 exist in the entire channel, and thus no interference is caused to other devices.

Mode 2 (condition 2): when the resource pool (pre) configuration of the first device does not allow FDM, or does not allow FDM of the first time slot in the initial COT.

Mode 3 (condition 3): when the transmission of the first device does not actually generate FDM on any time slot in the COT or the reserved resource, or when the first time slot of the COT or the reserved resource does not generate FDM, or when different devices do not generate other transmissions on the same time domain resource FDM, or other frequency domain resources on the time slot where the transmission resource is located; or the transmitted resources include all of the frequency domain resources within the channel.

When the condition 3 is satisfied, it means that the resource of the first device does not form FDM with the resource of the other device, and thus no resource conflict occurs.

Alternatively, the FDM actually occurs may be understood that there are no other transmissions on other frequency domain resources in the time slot where the resource is located, or there are no FDM transmissions in the time slot, or there are no other devices in the time slot where the resource is located.

Mode 4: the frequency domain resource of the candidate resource selected by the first device, or the frequency domain resource of the reserved resource, is the maximum frequency domain resource number or the maximum frequency domain range required to be used for random transmission in the COT, or the frequency domain resource number required to be used by the S-SSB, or all frequency domain resources in the channel, such as all sub-channels in the channel.

Or the frequency domain resource (quantity) of the candidate resource for resource selection by the first device, or the frequency domain resource of the reserved resource is the frequency domain resource quantity (sub-channel) needed to be used by the S-SSB.

Or the frequency domain resource (quantity) of the candidate resource for resource selection by the first device, or the frequency domain resource of the reserved resource is all frequency domain resources (sub-channels) in the channel. Therefore, the first equipment can obtain as many frequency domain resources as possible, and the transmission performance of the first equipment is improved.

Optionally, the candidate resource or the reserved resource is located in a time slot used for transmitting the S-SSB.

Alternatively, if the device 1 is ready to transmit the S-SSB in the selected or reserved resources, or in the initial COT according to the selected or reserved resources, the device 1 performs resource selection or resource reservation while reserving the frequency domain resources that are needed to be used by the S-SSB at least on the time slot in which the S-SSB is transmitted. In this way, when the device 1 selects or reserves the resource, at least the time slot in which the S-SSB is located is selected or reserved, and when other devices select or reserve the resource, the time slot in which the S-SSB is located will be excluded, i.e. other devices do not transmit in the time slot in which the S-SSB is located. In this way, the resource of the S-SSB of the device 1 and the resource of other devices will not collide, and interference of the device 1 to other devices can be avoided.

Or alternatively reserved for the subchannels that S-SSB needs to use. For example, assuming that the S-SSB needs to use 2 sub-channels as the S-SSB occupies the same frequency domain resources per slot, device 1 may select or reserve 2 sub-channels. Subsequently, device 1 may transmit S-SSBs on these 2 sub-channels, or initialize the COT according to the selected or reserved 2 sub-channels, and transmit S-SSBs within the COT.

Or alternatively, the device 1 may reserve resources for S-SSB as much as possible according to the maximum frequency domain resources or the maximum frequency domain range that any transmission needs to use within the COT.

For example, COT exists for transmissions 1-5, where transmission 5 requires the most frequency domain resources to use, and assuming 5 sub-channels 1-5, device 1 may select or reserve 5 sub-channels to be able to reserve as much resources as possible for S-SSB.

Or alternatively, the device 1 reserves all sub-channels within the entire channel.

Or alternatively, if in the IRB scenario, the S-SSB needs to occupy the continuous frequency domain resource, the device 1 may reserve all sub-channels where the S-SSB occupies the resource.

In a sixth aspect, a communication method is provided, the method being applicable to a second device, which may be a stand-alone device, or a module, chip, apparatus or the like in a device, the method comprising:

the second device receives the first S-SSB on the second resource.

Optionally, the second resource is a resource selected or reserved for the first device, or is a COT that the first device is initializing with the resource according to the selection or reservation.

In a seventh aspect, a communication method is provided, which is applicable to a second device, which may be a stand-alone device, or a module, chip, apparatus or the like in a device, the method comprising:

and determining a third resource and transmitting data or S-SSB on the third resource.

Optionally, the third resource does not overlap with the first resource, or the third resource does not overlap with all resources on the time slot excluding the first resource.

The first device selects or reserves any time-frequency resource for transmission, and/or the first device selects or reserves time-frequency resource for sending S-SSB, and/or the first device selects or reserves time-frequency resource for first resource in time domain for transmission. The selection or reservation may also be replaced by for transmission, occupancy, etc.

Optionally, the second device excludes the first resource, or excludes all resources on the time slot where the first resource is located further includes: receiving first indication information from the first device, wherein the first indication information is used for indicating at least one of the following:

1bit identification information for indicating that other devices are not allowed to select a resource FDM with themselves, or for indicating that S-SSBs are to be transmitted within the resource or the COT range;

The first device transmits time domain resource and/or frequency domain resource information of the S-SSB.

In an eighth aspect, a communication method is provided, the method being applicable to a first device, which may be a stand-alone device, or a module, chip, apparatus, etc. in a device, the method comprising:

the S-SSB is sent on the first resource.

A ninth aspect provides a communication method applied to a first device, where the first device may be a stand-alone device, or be a module, a chip, an apparatus, etc. in the device, the method includes:

The first device performs channel access and the first device transmits or receives S-SSB and/or data.

In one possible design, for a multi-channel scenario, if the first slot is a (pre) configured S-SSB slot and is located within the COT, the first slot being located outside the resource pool, the first device determines a fourth resource for transmitting the S-SSB by at least one of:

Alternatively, if the device intends to transmit an S-SSB in the first time slot, the S-SSB is independently transmitted on each channel for data transmission or on each channel within the resource pool, except for the channel where the (pre) configured S-SSB frequency domain location is located.

Alternatively, if the device intends to receive the S-SSB in the first slot, the device discards the reception of the S-SSB for the first slot.

Optionally, the device shares part or all of the frequency domain resources of the first time slot on each channel for data transmission to other devices or for its own data transmission. Alternatively, if the S-SSB is not intended to be transmitted nor received in the first time slot, the S-SSB may be transmitted on each channel used for data transmission.

In one possible design, for a multi-channel scenario, if the first slot is a (pre) configured S-SSB slot and is located within the COT, the first slot being located within the resource pool, the first device determines a fourth resource for transmitting the S-SSB by at least one of:

alternatively, if the device intends to transmit an S-SSB in the first time slot, then either the S-SSB is transmitted independently or the data is transmitted on each channel for data transmission or on each channel within the resource pool, except for the channel where the (pre) configured S-SSB frequency domain location is located

Alternatively, if the device intends to receive the S-SSB in the first time slot. Alternatively, the device shares part or all of the frequency domain resources of the time slot on each channel used for data transmission to other devices except for the channel on which the (pre) configured S-SSB frequency domain location is located. Alternatively, if the S-SSB is not intended to be transmitted nor received in the first slot, the S-SSB should be transmitted on each channel for data transmission, or data should be transmitted, or part or all of the frequency domain resources of that slot on each channel should be shared to other devices

Thus, in a multi-channel scenario, there is guaranteed to be data/S-SSB transmission or reception on each channel to avoid COT interruption.

In one possible design, the frequency domain of 11 RBs is extended to 12 RBs, where the highest or lowest 1RB is zero-filled (set to zero), and the other 11 RBs are sent according to the existing structure.

Optionally, the manner is applicable to at least one of PSBCH, S-PSS, S-SSS. Optionally, 3 REs are additionally spread in the frequency domain on the basis of 11RB, 11×12+3=134 REs just satisfy 2MHz at 15kHz, the 3 REs are adjacent to one end of the highest frequency domain or one end of the lowest frequency domain of the existing structure 11RB, and the 3 REs are zero-filled. Optionally, the manner is applicable to at least one of PSBCH, S-PSS, S-SSS.

Optionally, PSBCH interface transmission, S-PSS/S-SSS continuous transmission; or S-SSB is applicable to temporary exemptions.

When the subcarrier spacing is 15kHz, compared with the S-PSS/S-SSS in the OCB scheme of "PSBCH interface transmission," or the S-SSB (PSBCH/S-PSS/S-SSS) of the frequency domain continuous transmission, the bandwidth on the unlicensed spectrum is less than 2MHz, which does not meet the OCB requirement. By the method, PSBCH, S-PSS and S-SSS can meet the 2MHz bandwidth requirement of OCB.

In a tenth aspect, a communication method is provided, applied to a second device, where the second device may be a stand-alone device, or be a module, a chip, an apparatus, etc. in the device, and the method includes:

the second device receives or transmits S-SSB and/or data.

In one possible design, for a multi-channel scenario, if the first slot is a (pre) configured S-SSB slot and is located within the COT, the first slot being located outside the resource pool, the first device determines a fourth resource for the S-SSB by at least one of:

In one possible design, the frequency domain of 11 RBs is extended to 12 RBs, where the highest or lowest 1RB is zero filled (set to zero), and the other 11 RBs are sent according to the existing structure (see table 7 below);

Optionally, the manner is applicable to at least one of PSBCH, S-PSS, S-SSS. Optionally, the frequency domain is additionally extended by 3 REs on the basis of 11RB (11×12+3=134 REs just satisfy 2MHz at 15 kHz), the 3 REs are adjacent to one end of the highest frequency domain or one end of the lowest frequency domain of the existing structure 11RB, and the 3 REs are zero-padded. Optionally, the manner is applicable to at least one of PSBCH, S-PSS, S-SSS.

An eleventh aspect provides a communication method applied to a first device, the method comprising:

determining parameters of channel access according to a first propagation type and/or the first enabling information; the first propagation type is a propagation type associated with first side line information, and/or the first enabling information is enabling information associated with the first side line information;

And transmitting the first side line information on the channel.

In this way, if the first side information is to be transmitted, the channel access parameter is determined according to the first propagation type and/or the first enabling information associated with the first side information, so that the channel access parameter can reflect the current channel condition, and the more accurate channel access parameter is obtained, thereby facilitating the first device to access the channel and improving the communication performance.

Optionally, the seventh aspect further comprises the first device determining a first propagation type and/or said first enabling information. For example, the first propagation type and/or the first enabling information need to be determined before parameters of the channel access are determined from the first propagation type and/or the first enabling information.

Optionally, the first side line information is side line data information, and the first propagation type is a propagation type indicated by side line control information corresponding to the side line data information; and/or the first side line information is side line data information, and the first enabling information is enabling information indicated by side line control information corresponding to the side line data information; and/or the first side line information is side line feedback information, and the first propagation type is a propagation type indicated by side line control information corresponding to side line data information associated with the feedback information; the first side line information is side line feedback information, and the first enabling information is enabling information indicated by side line control information corresponding to side line data information associated with the feedback information. Optionally, the sidestream data information associated with the feedback information is second sidestream information.

Optionally, the sidestream data information includes a PSSCH, and sidestream control information corresponding to the sidestream data information is a first-order SCI and/or a second-order SCI, and sidestream feedback information is PSFCH.

Optionally, the first enabling information is indicated by a second order SCI of the first device. The first propagation type is indicated by the second order SCI of the first device.

Optionally, transmitting the first side information on the accessed channel includes: the channel for transmitting the first side information access is for transmitting the first side information according to the first CAPC access channel. Optionally, a value of the contention window is determined according to the value of the first CAPC.

Optionally, a value CWp of the contention window is determined from the value p of the first CAPC. The value p of the first CAPC belongs to at least any one of {1,2,3,4 }. Wherein the first CAPC is CAPC of the first device access channel and/or the sidestream control information of the first device indicates.

Optionally, the first propagation type and/or the first enabling information comprises: at least any one of HARQ de-enabling, HARQ enabled unicast, HARQ enabled and ACK/NACK based multicast, HARQ enabled and NACK only based multicast.

Optionally, the first propagation type includes at least any one of unicast, ACK/NACK-based multicast (also referred to as multicast option 2 or multicast option 2), NACK-only multicast (also referred to as multicast option 1 or multicast option 1), ACK-only multicast, broadcast

Optionally, the first enabling information includes at least any one of HARQ enabling, HARQ disabling, collision indication enabling, collision indication disabling.

In one possible design, there is at least one transmission within the reference duration, the at least one transmission being associated with at least one propagation type; determining parameters of channel access according to a first broadcast type in at least one broadcast type; and/or at least one transmission within the reference duration, the at least one transmission associated with at least one enabling information; and determining parameters of channel access according to first enabling information in the at least one enabling information. In this way, when there is at least one transmission, the parameters of the channel access can be determined according to the first propagation type and/or the first enabling information associated with the at least one transmission, so as to obtain more accurate channel access parameters.

Optionally, the presence of at least one transmission within the reference duration may also be understood as the presence of at least one second sidestream information within the reference duration.

Before the first device determines the channel access parameters (e.g., determines the contention window CWp), there is at least one transmission within the reference duration, which is associated with at least one propagation type and/or enabling information. The determined CWp values for the transmissions of the different propagation types may be the same or different. Similarly, the determined CWp values for the transmission of different enabling information may or may not be the same. Thus, a unified method of determining CWp is needed. The first device determines CWp, according to the propagation type of the first transmission (i.e., the first side information) of the first COT, is a simple and straightforward method, and can obtain the channel access parameters that more reflect the channel condition.

Optionally, the reference duration in the time domain satisfies at least any one of: the reference duration is after the last adjustment CWp, the reference duration is before the determination CWp, the reference duration starting time slot is the first time slot of the second COT, and the reference duration starting time slot is the time slot in which the first HARQ enabled transmission of the second COT is located.

In one possible design, the parameters of the channel access include a contention window value CWp or listen before talk LBT type.

The first device determines at least any one of the above-mentioned channel access parameters according to the first propagation type and/or the first enabling information. And adaptively adjusting the channel access parameters according to the characteristics of the transmitted sidestream information. Wherein the value of the channel access parameter is related to the difficulty of channel access.

Taking the channel access parameter as the contention window CWp as an example, CWp is adjusted to avoid collisions with other UEs. E.g., poor channel conditions, the value of CWp is increased and multiple listens for a period of time if the channel is idle. As another example, if the channel conditions are good, then the value of CWp is reduced and there is less listening to whether the channel is idle for a period of time. As another example, if it is not known whether the channel condition has changed after the last adjustment CWp, the value of CWp is not changed.

Taking the channel access parameter as the LBT Type as an example, the Type 1LBT (Type 1 LBT) requires a longer channel access time, but is less likely to collide with other device resources. Type 2LBT (Type 2 LBT) requires only a very short channel access time, but has limitations of applicable conditions. Further, the channel monitoring duration corresponding to the type 2A LBT, the type 2B LBT and the type 2B LBT are different. Determining a specific LBT type according to the first propagation type and/or the first enabling information may further guarantee flexibility and reliability of device access to the channel.

Optionally, the method further comprises: the first device determines a contention window CWp based on the first propagation type and/or the first enabling information associated with the first side-row information. The first device initiates a first COT according to the channel access parameters associated with the first side information. For example, the access channel may be based on the value CWp of the contention window (determined based on the first propagation type and/or first enabling information associated with the first side-stream information), or the first COT may be initiated based on the value CWp of the contention window.

Optionally, determining the LBT type according to the first propagation type and/or the first enabling information comprises: determining that the LBT type is one of type 1 channel access or type 2 channel access according to the first propagation type and/or the first enabling information; or determining that the LBT type is one of type 2A channel access, type 2B channel access and type 2C channel access according to the first propagation type and/or the first enabling information; or determining that the LBT type is one of type 2A channel access and type 2B channel access according to the first propagation type and/or the first enabling information; or determining that the LBT type is one of type 1 channel access, type 2A channel access, type 2B channel access and type 2C channel access according to the first propagation type and/or the first enabling information. The first device transmits first side line information according to the determined LBT type access channel.

In one possible design, the first sidestream information is first sidestream information sent on the channel after accessing the channel.

The first device accesses the channel using the parameters associated with the first side-line information, or the first device initiates the first COT using the parameters associated with the first side-line information. That is, the first device determines the channel access parameters based on the parameters associated with the first side information. This may allow the first device to adapt the channel access parameters according to the characteristics of the transmitted first side information.

Optionally, "the first sidestream information is first sidestream information transmitted after the accessed channel" may be further understood as at least any one of the following:

The first side information is a first transmission after accessing the channel, or the first side information is a transmission on a time slot where the first device accesses the channel, and/or the first side information is a transmission on a first time slot after the first device accesses the channel, and/or the first side information is a transmission on a second time slot after the first device accesses the channel, or the first side information is a first TB after accessing the channel, or the first side information is a first HARQ enabled transmission after accessing the channel, or the first side information is a first transmission in the first COT, or the first side information is a first TB in the first COT, or the first side information is a transmission on a first time slot in the first COT, or the first side information is a transmission on a second time slot in the first COT, or the first side information is a first HARQ enabled TB in the first COT, or CPAC of the first side information is CAPC of the initial COT.

The first side information may be further understood as a first TB, and both may be synonymously replaced.

In one possible design, determining parameters of channel access according to a first propagation type and/or the first enabling information includes:

determining first feedback information according to the first propagation type and/or the first enabling information;

Determining parameters of channel access according to first feedback information, wherein the first feedback information is feedback information associated with second side information in reference duration, and the second side information and the first side information meet at least any one of the following: the second propagation type associated with the second sidestream information is the same as the first propagation type of the first sidestream information; the second enabling information associated with the second side line information is identical to the first enabling information of the first side line information; the second source identification ID of the second side line information is the same as the first source ID of the first side line information; the second destination ID of the second side line information is the same as the first destination ID of the first side line information; the second HARQ process of the second lateral information is the same as the first HARQ process of the first lateral information; the first sidestream information is at least any one of retransmission, periodic transmission and periodic transmission of the second sidestream information; the first side line information is at least any one of retransmission reserved transmission, periodic reserved transmission and periodic reserved retransmission reserved transmission of the second side line information; the reserved resource indicated by the side line control information of the second side line information transmits the first side line information; the second sidestream information and the first sidestream information are both transmitted by the first device.

The feedback information may reflect the quality of the channel condition. For example, if the first device receives an ACK, it indicates that the receiving UE of the first device may decode the received data, which represents good channel conditions. For another example, if the first device receives a NACK, it indicates that the receiving UE of the first device cannot properly decode the received data, which represents poor channel conditions. For another example, after the last adjustment CWp, the first device does not receive any HARQ information, and the first device cannot determine whether the channel condition is changed, and does not change the value of CWp.

The fact that the second side line information meets at least any one of the above means that the service types of the first side line information and the second side line information are the same, so that according to feedback information associated with the second side line information with the same service type, channel access parameters which are more accurate and can reflect channel conditions more can be determined, and the method and the device are beneficial to improving the access channel of the first device.

Optionally, the first feedback information is feedback information associated with second sidestream information within a reference duration, including: the first feedback information is feedback information associated with second side information in at least one transmission within the reference duration.

Optionally, the second sidestream information is located within a reference duration; and/or, the second sidestream information is transmitted within a second COT; and/or the second sidestream information is first sidestream information transmitted within the second COT.

Optionally, the reference duration is associated with a second COT. For example, the starting position of the reference duration is the starting position of the second COT, or the starting position of the reference duration is the starting position of the first HARQ enabled side transmission within the second COT.

In one possible design, the second sidestream information is a plurality of pieces, and the plurality of pieces of second sidestream information includes third sidestream information and fourth sidestream information; the method further comprises the steps of:

The adjustment result corresponding to the third side line information is to adjust the value of the competition window to the minimum value, the adjustment result corresponding to the fourth side line information is to keep the value of the competition window, and the value of the competition window is determined to be adjusted to the minimum value; or the adjustment result corresponding to the third side line information is to adjust the value of the contention window to the minimum value, the adjustment result corresponding to the fourth side line information is to increase the value of the contention window to a larger candidate value, and the value of the contention window is determined to be adjusted to the minimum value; or the adjustment result corresponding to the third side line information is to keep the value of the contention window, the adjustment result corresponding to the fourth side line information is to increase the value of the contention window to a larger candidate value, and the value of the contention window is determined.

Optionally, in other schemes, the second side line information is a plurality of pieces, and the adjustment result corresponding to the first feedback information of at least one piece of second side line information is to adjust the value of the contention window to a minimum value, and determine to adjust the value of the contention window to the minimum value; or the second side line information is a plurality of pieces, the adjustment result corresponding to the first feedback information of all the second side line information is to increase the value of the contention window to a larger candidate value, and the value of the contention window is determined to be adjusted to be the minimum value.

That is, when the plurality of CWp adjustment results corresponding to the plurality of second sidestream information are different, the CWp is preferentially adjusted to the minimum value of the plurality of adjustment results, so that the first device can quickly access the channel.

Or in one possible design, when the plurality CWp of adjustment results corresponding to the plurality of second side row information are different, preferentially adjusting CWp to be the maximum value of the plurality of adjustment results.

In one possible design, the reference duration is determined based on a second channel occupancy time, COT, and the channel access priority CAPC for initializing the second COT is greater than or equal to first CPAC, wherein the first CAPC is CAPC of the first side row information association.

CAPC relates to the difficulty level of channel access, e.g. CAPC is small, and the channel is easier to access; CAPC is large, it is difficult to access the channel. Or CAPC has a small value, the channel can be accessed in a short time; CAPC is large, a long time is required to access the channel. Based on CAPC initial COT, which is the same as the first side information, it is better able to reflect whether the channel is currently easier to access or not, CWp is more accurate to adjust. Thus, a more accurate CWp can be obtained by adjusting CWp the feedback information associated with the sidelink transmission of the first propagation type and/or the first enabling information for the same (greater than or less than or equal to) reference duration of the CAPC initial COT as the first sidelink information. Collisions with transmissions of other devices in the resource pool can be better avoided.

Optionally, at least one of the following conditions is satisfied, the first device adjusts CWp according to the first feedback information associated with the second sidestream information for the reference duration: first CAPC is equal to second CAPC, first CAPC is greater than second CAPC first CAPC is less than second CAPC. Wherein the first CAPC is CAPC of the first side information association. Wherein the value of the first CAPC is p. The first device may determine CWp that the first CAPC is associated with. The first device may initiate a first COT according to the first CAPC, the first COT bearing the first side-information.

Wherein the second CAPC is CAPC of the second side row information association. The value of the second CAPC is p. The second CAPC may be indicated by side control information of the second side communication, or may be indicated by COT indication information of the second COT.

Optionally, "first CAPC is CAPC associated with first side information" may also be understood as: the first CAPC is CAPC of the initial first COT, the first side information is the first transmission within the first COT, or the first side information is the transmission within the first COT.

In one possible design, the method further comprises: and when the following third condition is met, determining the channel access parameter according to the value configured to the first device by the network device, or determining the channel access parameter according to the value pre-configured to the first device, or determining the channel access parameter according to a pre-defined value, or not adjusting the channel access parameter.

The third condition includes at least one of the following conditions: no sidestream information is detected for the reference duration; no second sidestream information is detected for the reference duration; no first feedback information is detected; the propagation type of sidestream information within a reference duration is not the first propagation type; the enabling information of the side row information within the reference duration is not the first enabling information.

The third condition may also be expressed as: the second sidestream information transmission without the first propagation type and/or the first enabling information may be understood as: a second sidestream information transmission without the first propagation type for the reference duration; and/or, a second sidestream information transmission without first enabling information for a reference duration; and/or, no feedback information corresponding to the second sidestream information of the first propagation type is transmitted in the second time; and/or, the feedback information corresponding to the second side line information without the first enabling information is transmitted in the second time.

Alternatively, the parameter of the non-adjustment channel access may be, for example, non-adjustment CWp.

Optionally, the first device determines CWp based on feedback information associated with the transmission of the reference duration propagation type for the ACK/NACK-based multicast, if the transmission of the ACK/NACK-based multicast is detected within the reference duration.

Optionally, no transmission with a propagation type of ACK/NACK based multicast is detected within the reference duration, a transmission with a propagation type of unicast is detected within the reference duration, and the first device determines CWp according to feedback information associated with the transmission with the propagation type of unicast for the reference duration.

Optionally, the first device determines CWp according to feedback information associated with the transmission of the multicast with the reference duration propagation type being NACK-only based, if no transmission of the multicast with the propagation type being ACK/NACK-based or a transmission with the propagation type being unicast is detected within the reference duration.

Thus, under the third condition, the first device determines the channel access parameter according to the method of the design, and when the third condition is not met, the first device can determine the channel access parameter according to the method in each design, thereby being beneficial to the first device to access the channel.

Optionally, when there are a plurality of second sidestream information, CWp is determined according to the propagation type of the plurality of second sidestream information and/or the priority of the enabling information.

Optionally, the first propagation type has the highest priority. That is, the propagation type associated with the second sidestream information is the same as the first propagation type associated with the first sidestream information, and CWp is determined from the first propagation type; or preferentially determined CWp according to the first propagation type.

Optionally, the priority of the first enabling information is highest. That is, the enabling information associated with the second side line information is the same as the first enabling information associated with the first side line information, and CWp is determined according to the first enabling information; or preferably in accordance with the first enabling information CWp.

Optionally, the propagation type of the transmission association within the reference duration is the same as the first propagation type associated with the first side information, and the first propagation type has the highest priority. The highest priority of the first propagation type may also be understood as being determined CWp based on the first propagation type.

Optionally, the transmission-associated enabling information within the reference duration is the same as the first enabling information associated with the first side-line information, and the priority of the first enabling information is highest. The highest priority of the first enabling information may also be understood as determining CWp based on the first enabling information.

In a twelfth aspect, there is provided a communication method, the method comprising:

And when the network equipment configures the value of the parameter of the channel access and the third condition is met, the first equipment determines the value of the parameter of the channel access according to the value configured by the network equipment.

The third condition may be referred to the design of the related aspect, and is not described herein.

In a thirteenth aspect, there is provided a communication method comprising:

Determining parameters of channel access according to a first broadcast type in at least one broadcast type; and/or determining parameters of channel access according to first enabling information in the at least one enabling information. At least one transmission within the reference duration, the at least one transmission associated with at least one enabling information; and/or there is at least one transmission within the reference duration, the at least one transmission being associated with at least one propagation type; the first propagation type is a propagation type associated with first side line information, and/or the first enabling information is enabling information associated with the first side line information;

And transmitting the first side line information.

The first side information in this aspect can be referred to the first information in the above aspects.

In a fourteenth aspect, a technical solution of the present application provides a communication device, including: an input device, a display screen, one or more processors, memory, and one or more computer programs; wherein the processor is coupled to the input device, the processor and the memory, the one or more computer programs being stored in the memory, the processor executing the one or more computer programs stored in the memory when the communication device is operating, to cause the communication device to perform the method as described in any of the designs of the above.

In a fifteenth aspect, the present application provides an apparatus comprising a processor and a memory for storing computer program code, the computer program code comprising computer instructions which, when executed by the processor, perform a method as described in any one of the possible designs of the application.

In a sixteenth aspect, the present application provides a computer readable storage medium comprising computer instructions which, when run on a communication device, cause the communication device to perform the method as described in any one of the possible designs of the above.

In a seventeenth aspect, the present application provides a computer program product for, when run on a communication device, causing the communication device to perform the method as described in any one of the possible designs of the above.

In an eighteenth aspect, embodiments of the present application provide a communications apparatus, which may implement a method implemented by a first device in any one of the above aspects or any one of the possible designs thereof, or implement a method implemented by a second device in any one of the above aspects or any one of the possible designs thereof, or implement a method implemented by a third device in any one of the above aspects or any one of the possible designs thereof. The apparatus comprises corresponding units or means for performing the above-described methods. The units comprised by the device may be implemented in software and/or hardware. The apparatus may be, for example, a stand-alone device, or a component or baseband chip, a system-on-chip, or a processor, etc. that may support implementation of the above methods in a device.

Illustratively, the communications apparatus includes a processor configured to support the communications apparatus to perform the corresponding functions of the terminal device in the methods shown above. The communication device may also include a memory, which may be coupled to the processor, that holds the program instructions and data necessary for the communication device. Optionally, the communication device further comprises an interface circuit for supporting communication between the communication device and other terminal equipment.

Illustratively, when the communication apparatus is to implement the first device function:

The communication means may comprise modular components of a transceiver unit (or communication module, transceiver module) and a processing unit (or processing module), etc., which modules may perform the corresponding functions of the first device in any of the above aspects or any of the possible designs thereof, or in the second aspect or any of the possible designs thereof. When the communication apparatus is a first device, the transceiver unit may be a transmitter and a receiver, or a transceiver obtained by integrating the transmitter and the receiver. The transceiver unit may include an antenna, a radio frequency circuit, etc., and the processing unit may be a processor, such as a baseband chip, etc. When the communication apparatus is a component having the above-described first device function, the transceiver unit may be a radio frequency unit, and the processing unit may be a processor. When the communication device is a chip system, the transceiver unit may be an input/output interface of the chip system, and the processing unit may be a processor of the chip system, for example: a central processing unit (central processing unit, CPU).

The transceiver unit may be configured to perform the actions of receiving and/or transmitting performed by the first device in any aspect or any possible design thereof. The processing unit may be operative to perform actions other than the receiving and transmitting performed by the first device in any aspect or any possible design thereof.

In a nineteenth aspect, a communication system is provided, which includes the first device and the third device according to any one of the aspects. Or comprises a second device, a first device and a third device.

In a twentieth aspect, a circuit is provided, coupled to a memory, for performing the method shown in any one of the above aspects or any one of its possible embodiments. The circuitry may include chip circuitry.

Drawings

FIGS. 1A-1G are schematic views of a related art scenario;

FIGS. 2A-2D are schematic diagrams illustrating a system architecture according to an embodiment of the present application;

Fig. 3 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 4 is a schematic flow chart of a communication method according to an embodiment of the present application;

Fig. 5A and fig. 5B are schematic diagrams of an application scenario provided in an embodiment of the present application;

Fig. 6 to 8 are schematic diagrams of application scenarios provided in the embodiments of the present application;

fig. 9A to fig. 9C are schematic diagrams of an application scenario provided in an embodiment of the present application;

fig. 9D is a schematic flow chart of a communication method according to an embodiment of the present application;

fig. 10 to fig. 13 are schematic diagrams of an application scenario provided in an embodiment of the present application;

Fig. 14 to 17 are schematic flow diagrams of a communication method according to an embodiment of the present application;

FIG. 18A is a schematic diagram of an application scenario provided by an embodiment of the present application;

fig. 18B is a flow chart of a communication method according to an embodiment of the present application;

Fig. 19-20 are schematic diagrams of application scenarios provided in embodiments of the present application;

Fig. 21 to fig. 22 are schematic flow diagrams of a communication method according to an embodiment of the present application;

fig. 23 is a schematic structural diagram of a communication device according to an embodiment of the present application;

Fig. 24 is a schematic structural diagram of a chip system according to an embodiment of the present application.

Detailed Description

The terms "first" and "second" and the like in the description and in the drawings are used for distinguishing between different objects or between different processes of the same object and not for describing a particular order of objects.

"At least one" means one or more,

"Plurality" means two or more.

"And/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural.

The character "/" generally indicates that the context associated object is an "or" relationship, e.g., a/B may represent a or B.

Furthermore, references to the terms "comprising" and "having" and any variations thereof in the description of the present application are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed but may optionally include other steps or elements not listed or inherent to such process, method, article, or apparatus.

It should be noted that, in the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the embodiment of the present application, sometimes a subscript such as W1 may be wrongly expressed in a non-subscript form such as W1, and the meaning of the subscript is consistent when the distinction is not emphasized.

The explanations of terms, expressions in each embodiment of the application apply to other embodiments of the application.

The various embodiments of the present approach may be implemented independently or in combination based on some inherent association.

In each embodiment of the present solution, different implementations may be implemented in combination or separately.

The description of resources in embodiments of the present disclosure may refer to time domain resources, and/or frequency domain resources, and/or time-frequency resources, unless specifically indicated. The time domain resource granularity may be any of a radio frame, a subframe, a slot, a mini-slot, a symbol, a second, a millisecond, a microsecond, etc. The frequency domain resource granularity may be any of RE, RB, interlace, sub-channels, RB set, sub-carriers, hz, kHz, MHz, etc.

The description of resource overlapping in the embodiments of the present solution may refer to overlapping time domain resources, overlapping frequency domain resources, and/or overlapping time-frequency domain resources (i.e. overlapping simultaneously in the frequency domain). In addition, the two parts can be partially overlapped or completely overlapped. Resource conflict is the same.

Embodiments of the present application may extend to FDM for a number of devices exceeding 2 for the description of FDM for device 1 and device 2.

In some embodiments, actions performed in accordance with CAPC may instead be performed in accordance with physical layer priorities. For example, determining the home device according to CAPC may be replaced with: and determining the home equipment according to the physical layer priority.

First, technical terms related to the embodiments of the present application are described:

1、LBT

1.1Type1 LBT

Two channel access modes are included in the NR-U (unlicensed spectrum), dynamic (dynamic) and semi-static (SEMISTATIC) channel access, respectively. Dynamic channel access can be applied to the situations of transmission of SL terminals and heterogeneous system terminals on unlicensed spectrum and the like. The dynamic channel access includes two channel access types, type1 channel access (also referred to as Type1 LBT) and Type2 channel access (also referred to as Type2 LBT), respectively.

Wherein type1 LBT is based on a back-off, and the back-off time may be related to a channel access priority (CHANNEL ACCESS priority class, CAPC), and the device may access the channel if it detects that the channel is idle for a long time.

Type1 LBT may include two processes: channel sensing (transfer duration) and cyclic sensing of duration Td.

1.2Type2 LBT

Type 2LBT contains three types, type 2A, type 2B, type C. Compared with the situation that the device for executing the Type1 LBT needs to listen for a longer time, the device for executing the Type 2LBT can access the channel when listening to the channel for a shorter time (such as 16us or 25 us), and the success rate of accessing the channel is improved compared with the Type1 LBT.

In some schemes, type2 LBT may be applied in the COT sharing scenario below.

Type 2A channel access: the device transmits immediately after perceiving that the channel is idle for at least the perceiving interval T _short =25 us.

Type 2B channel access: the device transmits immediately after perceiving that the channel is idle within tf=16us.

Type 2C channel access: the device may transmit without channel awareness for a maximum of 584us.

2. Retransmission reservation and period reservation:

In the NR mechanism, three fields, frequency domain resource indication (freq device ncy resource assignment), time domain resource indication (time resource assignment), resource reservation period (resource reservation period), may indicate resource reservation for retransmission and/or periodic transmission.

3. Channel occupancy time (channel occupancy time, COT)

After the devices such as the eNB/gNB/device execute the channel access process, a COT can be initialized, and the COT has a certain duration. COT may be shared for transmission between eNBs/gNB/devices(s).

4. COT sharing (sharing): after the device executes the channel type 1 access process and initializes the COT, the device may share the resources that the device does not need to use to other devices. In some schemes, other devices that are required to be shared have a transceiving relationship with the current device. For example, if other devices transmit unicast traffic, the receiving device should be the present device; if other devices transmit multicast/broadcast traffic, the receiving device should include the device. Other devices need to first perform a channel access procedure before transmitting using the COT.

5.1 Initial COT device

I.e. the device of the initial COT. The plurality of initial devices refer to initial devices that initially COT in the same slot in the time domain, and FDM (frequency domain resources are different) in the frequency domain. The different frequency domain resources are located within the same channel (channel) or different channels.

5.2, FDM transmission: refers to 2 transmissions that overlap in the time domain and do not overlap in the frequency domain. Alternatively, FDM may be classified into FDM at the time of initial COT and FDM within COT. Where FDM within a COT may include FDM of a device of an initial COT (which may be referred to as an initial device) continuous transmission (FDM due to device continuous transmission) or FDM of a COT shared transmission (between a shared device and an initial device/between shared devices).

5.3, Time GAP (GAP)

In some scenarios, a terminal may receive and transmit information in two consecutive time slots, respectively, or a terminal may receive and transmit information in the same time slot, respectively. Therefore, a symbol for the terminal to perform transmission/reception conversion is required. For example, the terminal may receive and transmit the PSSCH respectively in two consecutive slots, or the terminal may receive and transmit the PSSCH and PSFCH respectively in the same slot, requiring a symbol for the terminal to perform a transmit-receive conversion, that is, a processing time required for the radio frequency to convert the receiving action into the transmitting action, or a processing time required for the transmitting action to be switched into the receiving action.

6. Cyclic prefix extension (cyclic prefix extension, CPE)

CPE refers to redundant transmissions that occur prior to the actual useful channel/signal transmission. Often some redundant information or duplication of useful channels/signals. In unlicensed spectrum transmissions, such as NR-U, SL-U, it is often considered that the moment when the LBT ends is not necessarily always adjacent in time domain to the resources of the actual useful transmission, so that there may be a channel loss or other risk, and thus the temporal adjacency is guaranteed by transmitting CPEs at corresponding intervals. The CPE may be configured or instructed according to signaling.

The application scene of the CPE comprises the following two scenes:

Scene 1: as shown in fig. 1A, when the device initiates COT, the CPE (e.g., CPE 1) is sent prior to transmission of the Type1 LBT. CPE sent prior to transmission of Type1 LBT may be referred to as an initial CPE, e.g., CPE1 shown in fig. 1A may be referred to as an initial CPE of the initial device.

Scene 2: as shown in fig. 1A, in the COT, when the interval between the transmissions (such as transmission 1 and transmission 2) of the initial device (the device initializing the COT) itself does not satisfy the requirement of LBT type 2A, 2B, 2C for the interval between the two transmissions, a certain length of CPE (CPE 2) needs to be transmitted before the actual useful transmission (such as transmission 2) to satisfy the interval requirement.

Illustratively, the sum of the CPE duration and the LBT duration is one symbol duration. Still taking fig. 1A as an example, assuming that the last symbol of slot 1 is used as GAP, the initial device transmits CPE after performing LBT type 2A. The CPE carries part of the information that is actually to be sent in transmission 2, corresponding to transmission 2 being sent in advance. The sum of the duration of the CPE and the duration of LBT type 2A is the duration of the last symbol (e.g., 72 us). Therefore, the interval between the transmission 1 and the CPE (carrying the part of information to be transmitted in the transmission 2) can be ensured to be LBT duration, which is equivalent to sending the information in the transmission 2 in advance, so that the actual interval between the transmission 1 and the transmission 2 (sending in advance) can be reduced, and the interval requirement (LBT duration) between two adjacent transmissions can be satisfied.

Or in other scenarios, when the interval between the transmission of the initial device itself and the transmission of the shared device (the shared resource is acquired from the initial device and is used for transmission) does not meet the requirement of LBT type 2A, 2B, 2C for the interval between two transmissions, a CPE with a certain length needs to be sent before the actual useful transmission to meet the interval requirement.

In the embodiment of the present application, CPE used by a device in the COT may be referred to as CPE in the COT. The CPE within the COT may include a CPE used by an initial device within the COT and a CPE used by a shared device within the COT.

In some scenarios, as shown in fig. 1B, taking the first device as device 1 and the third device as device 2 as an example, device 1 performs LBT of 16us, device 2 performs LBT of 25us, and device 1 starts to transmit CPE after completing LBT access channel. At this time, since device 1 has started transmitting CPE, device 2 is still performing LBT, and device 2 detects that the channel is busy, LBT fails, and cannot access the channel. It follows that when there are multiple devices, only the longest CPE terminal can access and transmit, and the CPE short terminal cannot access due to blocking (blocking).

7. (Pre) configuration scheduling (configured grant, CG) transmissions

In the transmission mode, some resources need to be preconfigured, and when data arrives, the device can directly transmit on the configured resources without performing other actions such as resource selection.

8. The resource:

Specifically, time-frequency resources. According to the Rel-16/Rel-17NR protocol, the scheduling granularity of PSCCH/PSSCH is in units of one slot in the time domain and one or more subchannels in succession in the frequency domain. The transmitting device may transmit sidestream information on the resource. The sidestream information includes at least one of PSCCH, PSSCH, PSFCH, DM-RS, CSI-RS, PT-RS, S-SSB, SCI, first order SCI, second order SCI, CPE (CP extension, cyclic Prefix extension). The PSCCH carries a first order SCI, the PSCCH carries a second order SCI and/or data, and PSFCH carries feedback information. Wherein the PSCCH/PSSCH comprises a PSCCH and/or a PSSCH.

8.1 Physical sidelink Control Channel (PHYSICAL SIDELINK Control Channel, PSCCH)

The PSCCH carries a first order SCI. For ease of description, PSCCH and SCI are meant to be the same unless otherwise indicated. In the time domain, the PSCCH occupies two or three OFDM symbols starting from the second sidelink symbol; in the frequency domain, the PRBs carrying the PSCCH start from the lowest PRB of the lowest subchannel of the associated PSCCH, and the number of PRBs occupied by the PSCCH is within the subband range of one PSCCH. The PSCCH consists of {10,12,15,20,25} RBs, with specific values indicated by RRC signaling or pre-configured.

8.2 Physical sidestream shared channel (PHYSICAL SIDELINK SHARED CHANNEL, PSSCH)

The PSSCH carries at least 2 of a second order SCI, a MAC CE, and data. SCI may refer to first order SCI and/or second order SCI. For convenience of description, SCI refers to any one of first-order SCI, second-order SCI, first-order SCI, and second-order SCI when distinction is not made. In the time domain, on the resources without PSFCH, there are 12 symbols for carrying the PSSCH; on the PSFCH resources, there are 9 symbols for carrying the PSSCH. In the frequency domain, consecutive LsubCh subchannels are occupied. In addition, in one slot, the first OFDM symbol replicates information transmitted on the second symbol for automatic gain control (Automatic Gain Control, AGC).

8.3 Physical sidestream Feedback Channel (PHYSICAL SIDELINK feed back Channel, PSFCH)

PSFCH carry feedback information. On the PSFCH resources, the penultimate and third OFDM symbols carry PSFCH. The signal on the third last symbol is a repetition of the signal on the second last symbol for the receiving device to make AGC adjustments.

8.4 GAP symbol

In addition, the device may receive and transmit the PSSCH in two consecutive slots, respectively, or the device may receive and transmit the PSSCH and PSFCH in the same slot, respectively. Therefore, an additional symbol is required for the transmit/receive conversion of the device after the PSSCH and after PSFCH symbols.

8.5 AGC symbol

The symbol is located at the beginning of the transmission, e.g., symbol 0 of the PSCCH/PSSCH transmission, e.g., symbol 11 of PSFCH transmissions. Since the AGC adjustment cannot be performed while receiving and decoding data. The signal on the AGC symbol is thus a replica of the signal content on the next symbol. Since the SL transmission keeps the power on each symbol equal, the content of the remaining symbols can be received based on the results of the automatic gain control of the AGC symbols.

9. Resource pool and RB set

NR SL communication is based on resource pool (resource pool). By resource pool is meant a block of time-frequency resources dedicated to SL communication. The resource pool contains contiguous frequency domain resources. The time domain resources contained in the resource pool can be continuous or discontinuous. The different resource pools are distinguished by RRC signaling. The device receives on the receive resource pool and transmits on the transmit resource pool. If the resource pools have the same resource pool index, the time-frequency resources of the resource pools may be considered to be fully overlapping.

In SL-U, since the frequency band is shared by multiple forms of devices, for example, SL devices transmit on the same frequency band as Wi-Fi devices, bluetooth devices. Thus, the SL resource pool can also be understood as: a set of resources that can be used for SL transmissions. In this embodiment, the resource pool may also be referred to as one or more RB sets (RBs set), one or more channels (channels), one or more working channels (Operating channel), one or more nominal channel (Nominal Channel Bandwidth) bandwidths (bandwith). Wherein the meanings of the channel and RB sets may be interchanged. I.e. resource pool, channel, bandwidth, RB set are all used to represent the set of resources that can be used for SL transmission.

In Rel-16, RBs that are contiguous in the frequency domain constitute a subchannel. In SL-U, the frequency domain of the resource may be either contiguous RB (contiguous RB) or interleaved RB (interlaced RB). For example, the basic unit of frequency domain resource allocation is a subchannel, where the subchannel is composed of consecutive RBs or interleaved RBs. As another example, the basic unit of frequency domain resource allocation is a subchannel or an interlace, where a subchannel is composed of consecutive RBs and an interlace is composed of interleaved RBs. An example of interleaving is shown in fig. 1D.

10. Sidelink parameter set

The subcarrier spacing supported by R16 NR SL and the corresponding CP length are shown in table 1. In order to reduce the complexity of device implementation, only one CP length type and one subcarrier spacing are configured on one sidelink carrier. The RB numbers are shown in table 2 under different SCS in different maximum transmission bandwidths.

Under the CP-OFDM architecture, a single subcarrier on a single OFDM symbol is the smallest unit of time-frequency resources, and is called a Resource Element (RE) in a protocol. One RB refers to a frequency domain resource unit consisting of 12 consecutive subcarriers. The minimum unit of scheduling may also be RB, for example PSFCH scheduling units are 1 symbol in the time domain and one RB in the frequency domain. The above mentioned frequency domain granularity of the scheduling of PSCCH/pscsch is a subchannel or interlace, 1 subchannel is composed of {10,12,15,20,25,50,75,100} PRBs, and specific values are indicated by RRC signaling or preconfigured.

Table 1 subcarrier spacing supported in different frequency ranges

TABLE 2 number of RBs within maximum transmission bandwidth

The bandwidth of the resource pool may be at least one of {5,10,15,20,25,30,40,50,60,70,80,90,100} mhz. Under different SCS, the maximum transmission bandwidth corresponds to different RB numbers, as shown in table 2. The RB set has the same meaning as a channel, and is a frequency domain unit of COT. For example, COT includes M1 RB sets in the frequency domain, m= {1,2,3,4,5}.

The relationship of the resource pool to the RB set is explained as follows. The resource pool includes one or more RB sets. One or more COTs may be transmitted within the resource pool. For example, as shown in fig. 1C, RB set 0 transmits COT1, RB set 1, and RB set 2 transmits COT2. The frequency domain unit of the COT is one or more RB sets. Wherein the set of RBs may also be referred to as a channel.

The bandwidth of the resource pool is c×20mhz, and C is a positive integer, such as c= {1,2,3,4,5}. There is at least one channel in the resource pool. For example, the resource pool includes one channel, the channel bandwidth is 20MHz, and the resource pool bandwidth is 20MHz. For another example, the resource pool includes 2 channels, the channel bandwidth is 20MHz, and the resource pool bandwidth is 40MHz. For another example, the resource pool includes 5 channels, the channel bandwidth is 20MHz, and the resource pool bandwidth is 100MHz.

The frequency domain bandwidth of the RB set is 20MHz. The bandwidth of the resource pool is c×20Mhz or c×20+c2mhz, and C is a positive integer, such as c= {1,2,3,4,5}. For example, the bandwidth of the resource pool is 20MHz, and the resource pool contains 1 RB set. For another example, the bandwidth of the resource pool is 50MHz, and the resource pool contains 2 RB sets, which may or may not be adjacent in the frequency domain.

The device may transmit PSCCH and/or PSSCH on 1 RB set in the resource pool. The device is exemplified by transmitting PSCCH on a interlaces and PSSCH on B interlaces. The RB of the smallest index in the a interlaces is the same RB as the RB of the smallest index in the B interlaces. For example, a=1, b=4.

The device may transmit PSCCH and/or PSSCH on adjacent D sets of RBs in the resource pool. The device transmits PSCCH on A interlaces on the RB set with the minimum RB set index; the device transmits the PSSCH on D RB sets, in total, on B interlaces. For example, a=1, b=4, d=2, and the RB set index is 0 and 1, respectively, the device transmits the PSCCH on the RB set index of 0.

A guard band may also be included in the resource pool, as indicated by the 1C shading. There is a guard band of 5, 6 or 7 RBs between each RB set. Taking the 100MHz transmission bandwidth of 1C, table 3, 30kHz SCS as an example, there are 273 RBs in total in the 100MHz transmission bandwidth. Wherein RB set 0 to RB set 4 respectively comprise 50, 49, 50 and 50 RBs, and a guard bandwidth of 6 RBs is provided between each RB set. The guard bandwidth is used to avoid interference with each other transmitted by different devices on adjacent RB sets.

TABLE 3 RB set for wideband transmission and guard band

The frequency domain of the COT includes one or more RB sets. The frequency domain for COT includes multiple RB sets, and COT also includes guard bands in between the multiple RB sets. For example, COT1 shown in FIG. 1C, COT1 includes resources in RB set 0, excluding resources in guard bands adjacent to the RB set. Also for example, COT2 shown in FIG. 1C, COT2 includes resources in RB set 1 and RB set 2, and also includes resources in the guard band between RB set 1 and RB set 2.

11. Interlacing (Interace or INTERLACED RESOURCE BLOCKS)

The protocol defines a plurality of interleaved resource blocks (Multiple interlaces of resource blocks), hereinafter referred to as interlaces. Interlace M is made up of common resource blocks (CRB, common resource block) { M, m+m,2m+m, 3m+m, … }. Where M is the number of interlaces and there is M ε {0,1, …, M-1}. Optionally, the value of M is related to SCS. For example, when μ=0 (i.e., the subcarrier spacing is 15 kHz), M takes a value of 10. For another example, when μ=1 (i.e., the subcarrier spacing is 30 kHz), M takes a value of 5.

CRBThe relationship with interleaved resource blocks, BWP i and interlace m satisfies: /(I) Wherein/>The common resource block indicating the start of BWP is the number of CBRs relative to the common resource block 0. When there is no risk of confusion, the index μmay be omitted. The device expects BWP i to contain no less than 10 common resource blocks in the interlace. For convenience of description, the common resource block CRB may be understood as RB.

The resource allocation pattern includes two patterns, continuous and staggered. The interlacing can also be called interlacing, progressive and comb teeth. The 1 interlace includes N discontinuous RBs, and the transmission bandwidth includes M interlaces. Alternatively, the intervals between RBs within an interlace may be the same or different. For example, within 1 interlace, the interval of RBs may be M RBs. For example, as shown in fig. 1D, the horizontal axis represents the frequency domain, the unit is RB, the vertical axis represents the time domain, and the unit is symbol. Within the 20MHz frequency bandwidth, there are 51 Resource Blocks (RBs), i.e., 51 color lattices, at 30KHz subcarrier spacing. Of the 51 resource blocks, 10 or 11 equally spaced resource blocks form one interlace, totaling 5 interlaces. 11 yellow RBs correspond to interlace 0 and 10 green, blue, red, violet RBs correspond to interlace 1, interlace 2, interlace 3, interlace 4, respectively. In addition, the RB may also be referred to as PRB (physical resource block), i.e., physical resource blocks.

Taking the 20MHz transmission bandwidth as an example, the number of interlaces M and the number of PRBs in an interlace N are listed in the table. The combination of at least one interlace number M and RB number N in the interlace may be determined according to a configuration or a pre-configuration.

Table 4 combinations of number M of interlaces and number N of PRBs in interlaces under different SCS at 20mhz transmission bandwidth

The subchannels may also be formed of Contiguous RBs (CRBs).

12. Priority level

The traffic priority of the device is specifically the device transmit priority (transmission priority).

Priority, which may also be referred to as traffic priority, L1 priority (L1 priority), physical layer priority, priority carried in SCI of first order, priority carried in SCI 2-C, priority corresponding to PSSCH associated with SCI, transmission priority, priority for transmitting PSSCH, priority for selecting resources, priority for logical channel, priority for highest level of logical channel.

Wherein the priority levels have some correspondence with the priority values, e.g. a higher priority level corresponds to a lower priority value or a lower priority level corresponds to a lower priority value. Taking the example that the priority value corresponding to the higher priority level is lower, the range of the priority value can be an integer of 1-8 or an integer of 0-7. If the range of the priority value is 1-8, the priority value is 1, which represents the highest priority.

In unlicensed spectrum, there is a concept of CAPC. CAPC may also be translated into a channel access priority class. CAPC to relate the importance of the SL information for the first type LBT. For example CAPC is the priority p in the first type LBT. Optionally, CAPC terminal device may also be used to determine if the second SL information is transmitted within the initial COT of CAPC associated with the first SL information.

Where the CAPC level has some correspondence with the CAPC value, for example, the higher the CAPC level, the lower the CAPC value, or the lower the CAPC level, the lower the CAPC value. CAPC values can be integers from 1 to 4. When a lower CAPC value represents a higher rank CAPC, then a value of CAPC of 1 represents the highest rank CAPC. When a lower CAPC value represents a lower grade CAPC, then a value of CAPC of 1 represents the lowest grade CAPC.

In the present application, priority may refer to both traffic priority and channel access priority CAPC.

13. Time unit and frequency domain unit

The time domain resources include symbols (symbols), slots (slots), mini slots (mini-slots), partial slots (partial slots), subframes (sub-frames), radio frames (frames), sensing slots (sensing slots), and the like.

The frequency domain resources include Resource Elements (REs), resource Blocks (RBs), RB sets (RBs sets), subchannels (sub-channels), resource pools (resource pools), bandwidth parts (BWP), carriers (carriers), channels (interlaces), and the like.

For ease of description, the resources for transmitting the PSCCH/PSSCH are described herein with time domain resources as slots, frequency domain resources as subchannels, or interlaces.

14. Unlicensed Spectrum (Unlicensed Spectrum) or Shared Spectrum (Shared Spectrum)

According to the regulations for radio frequency division in the people's republic of China, in order to fully, reasonably and effectively utilize radio frequency spectrum resources, the normal operation of radio services is ensured, and the frequency bands are prevented from being divided by mutual interference among various radio services, radio stations and systems. The 2/3/4/4G technology is authorized spectrum, which needs to be applied by telecom operators for use, and has small interference and safety.

WiFi, bluetooth, zigbee, etc. technologies use unlicensed spectrum in order to act as a complementary tool for operators to enhance their service offerings. Licensed spectrum communication can be used without application and free. Communication over unlicensed spectrum may be subject to certain regulations, such as Listen-Before-Talk (LBT) and OCB (Occupied Channel Bandwidth) requirements, for ensuring access fairness between various devices operating over the spectrum. On unlicensed spectrum, various technologies such as NR-U, SL-U, wiFi, bluetooth, zigbee, etc. may be transmitted on the spectrum. Thus, unlicensed spectrum may also be referred to as shared spectrum. In this patent, the meaning of "unlicensed spectrum" and "shared spectrum" are the same and can be replaced with each other.

SL communication over unlicensed spectrum is referred to as SL-U. Any one of Wi-Fi equipment, bluetooth equipment, and Zigbee equipment may be simply referred to as a heterogeneous system device for SL equipment (the specification needs to define a "heterogeneous system device").

15. CO and COT

Channel occupancy (CO, channel occupancy) refers to the transmission of a device on one or more channels after performing a channel access procedure.

The device occupies channel transmission for a continuous period of time after performing Type1 channel access, referred to as channel occupancy time (COT, channel Occupancy Time). The frequency domain unit of the COT is a channel, and the time domain unit is ms or a time slot. In this patent, COT may be a time concept, i.e., the time of SL transmission; but also a resource concept, i.e. the time-frequency resource occupied by SL transmissions. In the present invention, COT and CO are the same concept unless further distinguished. Devices may transmit on multiple channels, either adjacent or not. In the present invention, the device transmitting on multiple channels can be understood as: the transmission of the device occupies 1 COT, and the COT occupies a plurality of channels in the frequency domain; or the transmission of the device occupies a plurality of COTs, each of which occupies 1 channel in the frequency domain.

The network device or the terminal device transmits in the COT after the success of the Type1 LBT access channel. This COT may be referred to as the initial COT of the network device or the terminal device. The first type of LBT is performed at a different CAPC, which can also be referred to as initial COT based on CAPC =p. Wherein the initial is INITIATED, INITIAL, INITIALIZATION or initial. The initial COT may also be translated into a created COT.

COT may be shared for transmission between devices (COT sharing). The device that initiated the COT may share the COT to other devices, i.e., for SL transmissions by other devices. The initial COT device and the COT sharing device occupy the channel for a continuous period of time to transmit COT sharing, and the corresponding conditions need to be met, for example, the initial COT device is a receiving device or a transmitting device of the COT sharing device, and for example, the initial COT device and the COT sharing device are members of the same group.

The transmission of the device cannot exceed the limit of the maximum channel occupation time (MCOT, maximum Channel Occupancy Time), denoted T _cot,p. The values of T _cot,p are different for different CAPC, as shown in table 5 or table 6. For 1 device to access a channel and transmit within the COT, the transmission time does not exceed the maximum channel occupation time T _cot,p. For multiple devices to transmit within the COT, the transmission times of the devices of the initial COT and the devices sharing the COT do not exceed the maximum channel occupation time T _cot,p. p is CAPC of the device of the initial COT; or p is CAPC with the smallest CAPC value in the device for COT transmission.

16. Channel access procedure

Access over unlicensed spectrum requires listen before talk (listen before talk, LBT). I.e. it is determined that the channel is idle for a period of time, the device is able to transmit in the channel. There are two channel access modes in the NR-U, dynamic (dynamic) and semi-static (SEMISTATIC) channel access, respectively. The device employs a dynamic or semi-static channel access method based on configuration or pre-configuration determination. Dynamic channel access may also be referred to as FBE (Frame Based Equipment) channel access. Or can also be understood as: the FBE accesses the channel through a dynamic access mode. Semi-static channel access may also be referred to as LBE (Load Based Equipment) channel access. Or can also be understood as: LBE accesses the channel through a semi-static access mode. In SL-U, both (or one) of these channel access methods should also be followed.

16.1 Dynamic channel Access

Dynamic channel access is suitable for the scene that SL terminals and heterogeneous system terminals transmit on unlicensed spectrum. The dynamic channel access includes two channel access types, type1 channel access and Type2 channel access, respectively. Wherein, type1 LBT is based on back-off, the back-off time is CAPC, and the channel needs to be idle for a long time to be accessed. Type2 channel access includes three types, type 2A, type 2B, type C. Type2 LBT requires only a short time (e.g., 16us or 25 us) for the channel to be idle for the device to access the channel. The COT sharing method is mainly used in COT sharing and has corresponding execution conditions, such as that the device for initial COT and the device for sharing COT mainly have a transceiving relationship.

16.2, Type 1channel Access (Type 1channel Access or Type 1SL channel access)

Type1 channel access may also be referred to as Type1 LBT. Comprising 2 parts: channel sensing (transfer duration) and cyclic sensing of length Td.

The channel perception of length Td consists of one tf=16 us and the subsequent consecutive mp tsl=9 us, i.e. td=tf+mp Tsl. Wherein, the sensing time of Tf is at the first 9us, and the loop sensing is entered after all sensing times of Td are idle. mp is shown in Table 5 or Table 6, where CW _min,p≤CW_p≤CW_max,p is the contention window (Contention window) and T _cot,p is the maximum length of COT. CWmin, p is the minimum value of the contention window when CAPC is p, CWmax, and p is the maximum value of the contention window when CAPC is p.

Wherein whether the channel is idle or busy is determined according to a channel detection threshold. For example, if the received power (detected power) is greater than the energy detection threshold X _Thresh, then the channel is busy. As another example, if the received power (detected power) is less than the energy detection threshold X _Thresh, the channel is idle.

The loop sensing is a loop process based on a counter N, comprising the steps of:

Step 1: let n=ninit, where Ninit is a random number ranging from 0 to CW _p. Then enter step 4;

Step 2: if N >0, the ue decides to decrease the counter value, let n=n-1;

Step 3: sensing a channel (SENSE THE CHANNEL) in a sensing time slot (an additional sensing slot duration), and if the sensing result is idle, entering a step 4; otherwise, enter step 5;

step 4: stopping if n=0; otherwise, enter step 2;

step 5: sensing the channel until one sensing time slot (sensing slot) in the Td is sensed as busy, or until all sensing time slots in the Td are idle;

step 6: if all the sensing time slots in the Td are idle, entering a step 4; otherwise, step 5 is entered.

The CWmin, p and CWmax, p, mp, CWmin, p and CWmax are selected prior to step 1 above, p being determined based on CAPC (denoted p) associated with the network device or equipment transmission, as shown in table 5 or table 6:

Table 5type 1 channel access related parameter values-example 1

Table 6type 1 channel access related parameter values-example 2

The network device or terminal device maintains the contention window value CWp and adjusts CWp before step 1 according to the following steps:

for each priority in the table, CWp =cwmin, p corresponding to the priority is set.

In the feedback HARQ-ACK value corresponding to the data sent by the network device or the terminal device in the reference subframe k, if at least 80% of the data is negatively acknowledged (negative acknowledgment, NACK) by feedback, increasing the CWp value corresponding to each priority to the next higher allowable value, and using in step 2; otherwise, step 1 is performed. Wherein the reference subframe k is the initial subframe of the last data transmission of the network device or the terminal device on the channel.

16.3, Type 2channel Access (Type 2channel Access or Type 2SL channel access)

Type2 channel access includes three types, type 2A, type 2B, type C. Type2 LBT requires only a short time (e.g., 16us or 25 us) for the channel to be idle for the UE to access the channel. The method is mainly used in COT sharing and has corresponding execution conditions, for example, the UE of the initial COT and the UE sharing the COT mainly have a transceiving relationship.

Type 2A channel access: the UE transmits immediately after perceiving that the channel is idle for at least the perceiving interval T _short =25 us. Specifically, T _short =25us consists of 1 tf=16us perceived time slot and 1T _sl =9us perceived time slot. If both perceived time slots are idle, the channel is considered idle.

Type 2B channel access: the UE transmits immediately after perceiving that the channel is idle within tf=16us. Specifically, the channel sensing occurs at the last 9us of Tf, the channel sensing time is not less than 5us, and if more than 4us sense that the channel is idle, the channel is considered to be idle.

Type 2C channel access: the UE may transmit without channel awareness for a maximum of 584us.

16.4 Semi-static channel Access

Semi-static channel access is suitable for use in scenarios where only SL terminals transmit over unlicensed spectrum. In semi-static channel access, a base station or device occupies a channel with a period of T _x in every two consecutive radio frames. The time point of the occupation start is i·t _x or i·t _x +offset of the even-index radio frame. The duration of the occupied channel is at most 0.95T _x. The last max (0.05T _x, 100 us) duration in period T _x is the idle duration of the period. The base station or device does not transmit during this idle time. Wherein T _x is configured or preconfigured, e.g., at least any one of {1,2,2.5,4,5, 10} ms;

17. Retransmission reservation and period reservation:

In the NR mechanism, three fields, i.e. frequency domain resource indication (Frequency resource assignment), time domain resource indication (Time resource assignment), resource reservation period (Resource reservation period), may indicate resource reservation for retransmission and/or periodic transmission. As shown in fig. 1E, the frequency domain indication field indicates the number of sub-channels and frequency domain positions of the initial transmission and retransmission, e.g., SCI on R1 resource indicates the number of sub-channels and frequency domain positions of R1, R2 and R3. The time domain indication field indicates a time interval between the retransmission resource and the primary transmission resource, such as a time interval from the end position of the R1 time slot to the end position of the R2 time slot and a time interval from the end position of the R1 time slot to the end position of the R3 time slot indicated by SCI on the R1 resource. The resource reservation period field indicates a resource reservation period, such as the time interval of R1 and R4, the time interval of R2 and R5, and the time interval of R3 and R6 in fig. 1E.

Taking SCI to indicate 3 resources (nmax=3) as an example, time domain, frequency domain, and subchannel information of 3 resources can be represented by frequency domain resource allocation and frequency domain resource allocation. The first resource is the resource where the PSCCH/PSSCH is currently sent, and the second two resources are reserved for retransmission. In addition, due to the resource reservation period field in SCI, the UE may also reserve periodic resources of the above 3 resources periodically. In the present invention, the "SCI indicated resource" may be either a current PSCCH/PSSCH transmission resource, a retransmission reserved resource, or a periodic reserved resource. Fig. 1E shows an example of retransmitting reserved resources and periodically reserving resources.

As shown in fig. 1E, SCI is detected on R1 resources at the UE (indicated by solid line) and resources to be used for resource transmission are reserved (indicated by dotted line). The two fields of the time domain resource indication and the frequency domain resource indication in SCI indicate the 3 resources R1, R2 and R3 (nmax=3), where R2 and R3 reserve resources for retransmission. The reservation period (or reservation interval) field in SCI indicates R4, which is 1 resource, R4 reserves resources for the period of R1. Since the frequency domain resources reserved in the period are the same, the time domain resources are integer times of the period, which is equivalent to the reservation of R5 in the period of R2 and the reservation of R6 in the period of R3. I.e. R4 is considered reserved for R5 and R6, although R4 is not used for sidestream transmission when SCI on R1 is detected. The above procedure is called chain reservation.

18. Source identifier and destination identifier

The Layer 2 Source identifier (Source Layer-2 ID or Source L2 ID) is 24 bits. The lower 8bits (LSB part (8 bits)) of the layer 2 source identifier is called a layer 1 source identifier, namely a source ID (source ID) indicated in the SCI of NR; the upper 16bits (MSB part (16 bits)) are called SRC and indicated in the MAC header of the MAC CE. The source identity in the control information may refer to the source ID indicated in the SCI of the NR, the SRC in the MAC header, the layer 2 source identity.

The layer 2 destination identifier (Destination Layer-2 ID or destination L2 ID) is 24 bits. The lower 16bits (LSB part (16 bits)) of the layer 2 destination identification is referred to as the layer 1 destination identification, i.e., destination ID (destination ID) indicated in the SCI that is NR; the upper 8bits (MSB part (8 bits)) are called DST, indicated in the MAC header of the MAC CE. The destination identification in the control information may refer to the destination ID indicated in SCI, DST in MAC header, layer 2 destination identification.

In addition, destination may also be referred to generally in the protocol. Specifically, for unicast, the destination generation layer 2 source identifier and layer 2 destination identifier pair; for broadcast and multicast, destination generation layer 2 destination identification.

19. CWp adjustment of NR-U

The CW _p value needs to be determined in the case of type1 LBT. NR-U standardizes the procedure of determining CW _p for both UL and DL. In the present invention, "determining the contention window CW _p" may also be understood as "maintaining the contention window CW _p", "updating the contention window CW _p", "adjusting the contention window CW _p", and the above concepts may be synonymously interchanged.

19.1, Procedure for determining CW _p for UL:

the UE transmits using a type1 LBT channel access method, where CAPC =p. The UE adjusts the contention window CW _p before step 1 of the type1 LBT by the following method. In the present invention, "adjusting the contention window CW _p" may also be understood as "maintaining the contention window CW _p", "updating the contention window CW _p".

Step 1: for each CAPC =p (p e {1,2,3,4 }), let CW _p＝CW_min,p, where;

Step 2: if there is HARQ-ACK feedback after the last CW _p update, step 3 is entered. Otherwise, if the transmission after Type1 LBT after the last CW _p update does not include retransmission, or if the transmission is performed within T _w after the reference duration (REFERENCE DURATION) corresponding to the earliest UL channel occupation, step 5 is entered; otherwise, entering a step 4;

Step 3: determining according to HARQ-ACK feedback corresponding to the PUSCH in the reference duration of the latest UL channel occupation: in the HARQ-ACK feedback information of PUSCH, if at least one of the TB-based feedback information is ACK or if at least 10% of the CBG-based feedback information is ACK, then step 1 is entered; otherwise, entering a step 4;

step 4: for each CAPC =p (p e {1,2,3,4 }), add CW _p to the next larger candidate;

Step 5: for each CAPC =p (p e {1,2,3,4 }), CW _p is maintained and step 2 is entered.

If CW _p＝CW_max,p, and CW _p＝CW_max,p has been taken K consecutive times as the generation value of Ninit, it will be reset to the CW _min,p of the corresponding rank. Where K is a value selected from {1,2, …,8} for each CAPC =p.

19.2 Procedure for determining CW _p for DL:

The network device transmits PDSCH using a type1 LBT channel access method, where CAPC =p. The UE adjusts the contention window CW _p before step 1 of the type1 LBT by the following method. Wherein "adjusting the contention window CW _p" may also be understood as "maintaining the contention window CW _p", "updating the contention window CW _p".

Step 1: for each CAPC =p (p e {1,2,3,4 }), let CW _p＝CW_min,p, where;

step 2: if the HARQ-ACK feedback exists after the last CW _p update, the step 3 is entered; otherwise, if no retransmission or transmission is performed within T _w after the reference duration corresponding to the earliest DL channel occupation after the last CW _p update, step 5 is entered; otherwise, entering a step 4;

Step 3: determining according to HARQ-ACK feedback information corresponding to PDSCH in the reference duration occupied by the latest DL channel: in the HARQ-ACK feedback information of the PDSCH, if at least one of the feedback information based on the TB is ACK or if at least 10% of the feedback information based on the CBG is ACK, the step 1 is entered; otherwise, entering a step 4;

If CW _p＝CW_max,p, and CW _p＝CW_max,p has been taken K consecutive times as the generated value of N _init, it will be reset to the corresponding level of CW _min,p. Where K is a value selected from {1,2, …,8} for each CAPC =p.

CW _p adjustment step 2 for UL and DL is shown in fig. 1F. CW _p adjustment step3 for UL and DL is shown in fig. 1G.

The technical scheme of the embodiment of the application can be applied to cellular communication, internet of vehicles, terminal direct communication (such as Side Link (SL) communication), wireless fidelity (WIRELESS FIDELITY, wi-Fi) communication systems or other systems. Alternatively, the cellular communication system includes, but is not limited to, a New Radio (NR) communication system, a long term evolution (long term evolution, LTE) system, a subsequent evolution communication system (e.g., a 6G communication system, etc.).

By way of example, fig. 2A illustrates an architecture of a communication system to which embodiments of the present application are applicable. The system may include terminals (such as devices 1-3). The terminal and the surrounding terminals can establish a direct communication link to realize direct communication, such as: the device 1 and the device 2 can be in direct communication.

Alternatively, in embodiments of the present application, the terminal may also be replaced with a terminal device, apparatus, or the like.

By way of example, a direct communication link established between terminals may be defined as SL, and an interface through which a terminal communicates directly with surrounding terminals may be referred to as a PC5 port.

Optionally, the communication system shown in fig. 2A may further include a network device. The terminal may send a message to the opposite terminal in a network device transfer manner, for example: device 1 may send a message, such as a vehicle-to-anything (V2X) message, to a network device, which sends the message to device 2.

For example, a communication link in which a terminal transmits information to a network device may be defined as an Uplink (UL), a communication link in which the terminal receives information from the network device may be defined as a Downlink (DL), and an interface between the terminal and the network device may be referred to as a Uu interface.

Alternatively, the network architecture shown in fig. 2A is merely an exemplary architecture diagram, and embodiments of the present application are not limited to the number of devices included in the communication system shown in fig. 2A. Furthermore, although not shown, the network shown in fig. 2A may include other functional entities in addition to the functional entities shown in fig. 2A, such as: the application server (application server), core network equipment, etc., are not limited.

The network device in fig. 2A may be configured to implement radio physical control functions, resource scheduling and radio resource management, radio access control, mobility management, and the like. The network device may be AN Access Network (AN)/radio access network (radio access network, RAN) device, a device composed of a plurality of 5G-AN/5G-RAN nodes, or any one of a base station (nodeB, NB), AN evolved nodeB (eNB), a next generation nodeB (gNB), a transceiver point (transmission receive point, TRP), a transmission point (transmission point, TP), and some other access node. In the embodiment of the present application, the means for implementing the function of the network device may be the network device, or may be a means capable of supporting the network device to implement the function, for example, a chip system. In the technical solution provided in the embodiment of the present application, the device for implementing the function of the network device is the network device, which is described by taking the network device as an example.

The terminal is a terminal which is accessed to the communication system and has a wireless receiving and transmitting function or a chip which can be arranged on the terminal. By way of example, the terminal may be a vehicle, which is not limited to any type of vehicle, such as an automobile, a bicycle, an electric car, an airplane, a ship, a train, a high-speed rail, etc., and may include an in-vehicle device capable of directly communicating with other devices, which may be referred to as a user equipment (ue) or a terminal (terminal).

The terminal may also be a user device, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user device. For example, the terminal in the embodiment of the present application may be a mobile phone (mobile phone), a tablet (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal, an augmented reality (augmented reality, AR) terminal, a Mixed Reality (MR) terminal, a vehicle user device (vehicle user equipment, V device), a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned (SELF DRIVING), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (SMART GRID), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (SMART CITY), a wireless terminal in smart home (smart home), a vehicle-mounted terminal, an RSU with a terminal function, and the like. The terminal of the present application may be an in-vehicle module, an in-vehicle component, an in-vehicle chip, or an in-vehicle unit that is built in a vehicle as one or more components or units, and the vehicle may implement the communication method provided by the present application through the in-vehicle module, the in-vehicle component, the in-vehicle chip, or the in-vehicle unit.

Fig. 2B shows another example of a communication system to which the embodiment of the present application is applied, in which a terminal may be a vehicle or an in-vehicle apparatus, or the like. The communication method provided by the embodiment of the application can be used for communication between the vehicles or the vehicle-mounted equipment and between the network equipment and the vehicles.

Fig. 2C shows another example of a communication system in which an embodiment of the present application is applicable, the terminal in the communication system may be an AR/VR/MR device, a processing device/display device (cell phone, computer, tablet, etc.), or the like. The AR/VR/MR device and the processing device/display device may communicate according to a communication method provided by an embodiment of the present application.

Fig. 2D shows another example of a communication system, which may be a Wi-Fi system, to which embodiments of the present application are applicable. The communication method provided by the embodiment of the application can be used for communication between the network equipment (such as a router) and the terminal.

In the embodiment of the present application, the device for implementing the function of the terminal may be the terminal itself, or may be a device capable of supporting the terminal to implement the function, for example, a chip system. In the embodiment of the application, the chip system can be composed of chips, and can also comprise chips and other discrete devices.

The system architecture and the service scenario described in the present application are for more clearly describing the technical solution of the present application, and do not constitute the only limitation of the technical solution provided by the present application, and those skilled in the art can know that the technical solution provided by the present application is equally applicable to similar technical problems with the evolution of the system architecture and the occurrence of new service scenarios.

Alternatively, the terminal or the network device in the embodiment of the present application may be implemented by a communication device having the structure described in fig. 3. Fig. 3 is a schematic hardware structure of a communication device according to an embodiment of the present application. The communication device 400 comprises at least one processor 401, a memory 403 and at least one communication interface 404. Wherein the memory 403 may also be included in the processor 401.

Processor 401 may be comprised of one or more processing units, which may be a central processing unit (central processing unit, CPU), application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the programs of the present application.

Communication lines exist between the above components for communicating information between the components.

A communication interface 404 for communicating with other devices. In the embodiment of the application, the communication interface may be a module, a circuit, an interface or other devices capable of realizing the communication function, and is used for communicating with other devices. Alternatively, the communication interface may be a separately provided transmitter that is operable to transmit information to other devices, or a separately provided receiver that is operable to receive information from other devices. The communication interface may also be a component integrating functions of sending and receiving information, and the embodiment of the application does not limit the specific implementation of the communication interface.

The memory 403 may be a read-only memory (ROM) or other type of memory module that can store static information and instructions, a random access memory (random access memory, RAM) or other type of memory module that can store information and instructions dynamically, or an electrically erasable programmable read-only memory (EEPROM), an optical disk, a magnetic disk, or other magnetic storage device. The memory may be stand alone and be coupled to the processor via a communication line. The memory may also be integrated with the processor.

Wherein the memory 403 is used to store computer-executable instructions that may be invoked by one or more processing units in the processor 401 to perform corresponding steps in the various methods provided in the embodiments described below.

Alternatively, the computer-executable instructions in embodiments of the present application may be referred to as application code, instructions, computer programs, or other names, and embodiments of the present application are not limited in detail.

In a particular implementation, as one embodiment, the communication device 400 may include multiple processors, such as the processor 401 and the processor 407 in FIG. 3. Each of these processors may be a single-core processor or a multi-core processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

An exemplary block diagram of a communication device is shown in fig. 3. It should be understood that the illustrated communication device is only one example, and that in practical applications the communication device may have more or fewer components than shown in fig. 3, may combine two or more components, or may have a different configuration of components.

The communication device 400 may be a general purpose device or a special purpose device, and embodiments of the present application are not limited to the type of communication device 400. The terminal may be a device having a similar structure to that of fig. 3.

The following describes a communication method provided by an embodiment of the present application with reference to the accompanying drawings.

Example 1

Referring to fig. 4, the communication method provided by the embodiment of the application includes the following steps:

S101, the first device initializes a first COT.

After the first device performs the channel access procedure, a first COT may be initialized, the COT having a certain duration. The first COT may be shared for transmissions between enbs/gnbs/devices(s).

The frequency domain resource occupied on the first time slot in the first COT is the second frequency domain resource, and the frequency domain resource occupied on the first time slot of the initialized second COT by the third device is the third frequency domain resource. The second frequency domain resource and the third frequency domain resource may be frequency division multiplexed, or the second frequency domain resource and the third frequency domain resource may not be frequency division multiplexed. The following description is given according to whether the second frequency domain resource and the third frequency domain resource are frequency division multiplexed or not:

Case 1: frequency division multiplexing between second frequency domain resource and third frequency domain resource

In the embodiment of the present application, the second device includes the device 3 and the third device is taken as the device 2 as an example, but the second device is not limited to the device 3, the third device is not limited to the device 2, and the device 3 and the second device have the same meaning without additional description, or the device 3 is an example of the second device. Device 2 is synonymous with the third device or device 2 is an example of the third device.

Illustratively, as shown in FIG. 5A, taking a first device as device 1 and a third device as device 2, device 1 initializes a first COT that includes time slots 1-3. Device 2 initializes a second COT comprising slot 1, slot 2. The frequency domain resources occupied by device 1 on the first time slot (time slot 1) in the first COT (frequency domain resources with index 2) are frequency division multiplexed with the frequency domain resources occupied by device 2 on the first time slot (time slot 1) in the second COT (frequency domain resources with index 1).

In the case of frequency division multiplexing, the frequency domain resources of device 1, device 2 may span multiple channels, or multiple sub-channels within a channel. Illustratively, as in (a) of fig. 5B, the frequency domain resources of both device 1 and device 2 are in channel # 1. As in (B) of fig. 5B, the frequency domain resource of device 1 is in channel #1, and the frequency domain resource of device 2 is in channel # 2. As in (c) of fig. 5B, the frequency domain resources of device 1 include one or more sub-channels in channel #1 and one or more sub-channels in channel # 2. The frequency domain resources of device 2 include one or more subchannels in channel #1 and one or more subchannels in channel # 2. The embodiments of the present application do not limit the specific locations of the frequency domain resources of device 1, device 2.

In the embodiment of the present application, the device that has initialized the COT may be referred to as an initial device. For example, the first device initializing the first COT and the second device initializing the second COT may be referred to as initial devices.

Case 2: non-frequency division multiplexing between second frequency domain resource and third frequency domain resource

Illustratively, as in (a) of fig. 6, again taking the first device as device 1 and the third device as device 2 as an example, device 1 initializes a first COT, which includes time slots 1-3. Device 2 initializes a second COT comprising slot 1, slot 2. The frequency domain resources occupied by device 1 on the first time slot (time slot 1) in the first COT (frequency domain resources with index 2) are not frequency division multiplexed with the frequency domain resources occupied by device 2 on the first time slot (time slot 3) in the second COT (frequency domain resources with index 1).

As a further example, as in fig. 6 (b), the frequency domain resources occupied by device 1 on the first time slot (time slot 1) in the first COT (frequency domain resources with index 2) are not frequency division multiplexed with the frequency domain resources occupied by device 2 on the first time slot (time slot 4) in the second COT (frequency domain resources with index 1).

S102, the first device sends first sharing indication information to the second device.

The first sharing indication information includes information of part or all of frequency domain resources in the first frequency domain resources, and the part or all of frequency domain resources are used for sharing to the second equipment for transmission. The first frequency domain resource is a frequency domain resource occupied by the first device in the first COT; or the first frequency domain resource is a frequency domain resource included in the first COT.

It may be appreciated that, after the first device initializes the first COT, the first device may instruct to share the resources in the first COT to other devices for transmission through the first sharing indication information. In the embodiment of the application, the device which receives the sharing indication information from other devices and uses the shared resource indicated by the sharing indication information may be referred to as a sharing device or a response device.

In the embodiment of the present application, the first device sends first sharing indication information to the second device, where the first sharing indication information includes information of part or all of frequency domain resources in the first frequency domain resource, that is, the first device has permission to share resources in the COT, which may be understood as at least one of the following ways:

5. The second device does not expect the receiving device 1 to share at least one frequency domain resource other than the first frequency domain resource.

According to the relation between the shared frequency domain resource and the frequency domain resource occupied by the initial equipment in the COT and whether FDM is formed between the resources of the initial equipment, the resource sharing condition in the embodiment of the application can be divided into the following four conditions:

Case 1: the shared device comprises shared frequency domain resources which are less than or equal to the frequency domain resources occupied by the initial device

Illustratively, as in fig. 7, the initial device is device 1, device 1 does not form FDM with other devices. The device 1 may share itself in the frequency domain resources occupied by the COT to the device 3 (shared device). As in fig. 7 (a), device 1 occupies subchannel 1 of channel #1, device 1 may share subchannel 1 to device 3, and device 3 may transmit on subchannel 1. As in fig. 7 (b), device 1 occupies sub-channels 1, 2 of channel #1, and device 1 may share some or all of sub-channels 1, 2 to device 3. As in fig. 7 (c), device 1 occupies sub-channel 1 of channel #1 and sub-channel 1 of channel #2, and device 1 may share some or all of the occupied sub-channels to device 3.

Case 2: the shared device comprises a shared frequency domain resource which is larger than the frequency domain resource occupied by the initial device

Illustratively, as in fig. 8, the initial device is device 1, and device 1 does not form FDM with other devices. Device 1 may share some or all of the frequency domain resources comprised by the COT to device 3. As in fig. 8 (a), the initial COT of device 1 includes sub-channels 1, 2 of channel #1, and device 1 may share some or all of sub-channels 1, 2 (including sub-channels occupied by device 1 within the COT and sub-channels not occupied) to device 3. As in fig. 8 (b), the initial COT of device 1 includes sub-channels 1, 2 of channel #1 and sub-channels 1, 2 of channel #2, and device 1 may share some or all of these four sub-channels to device 3. As in fig. 8 (c), the initial COT of device 1 includes sub-channels 1, 2 of channel #1 and sub-channel 2 of channel #2, and device 1 may share some or all of these four sub-channels to device 3.

Case 3: the shared device comprises shared frequency domain resources which are smaller than or equal to the frequency domain resources occupied by the plurality of initial devices, and FDM is carried out among the resources of the plurality of initial devices

Illustratively, as in FIG. 9A, there is FDM between the resources of the original device 1 and device 2. Devices 1, 2 may share frequency domain resources each among the frequency domain resources occupied by the COT to device 3 (shared device). As in fig. 9A (a), device 1 occupies subchannel 1 of channel #1, and device 1 may share subchannel 1 to device 3. Similarly, device 2 occupies subchannel 2 of channel #1, and device 2 may share subchannel 2 to device 3. As in fig. 9A (b), device 1 occupies sub-channels 1, 2 of channel #1, and device 1 may share some or all of sub-channels 1, 2 to device 3. Device 2 occupies subchannel 2 of channel #2 and device 2 may share subchannel 2 to device 3. As in (c) of fig. 9A, device 1 occupies sub-channel 1 of channel #1 and sub-channel 1 of channel #2, and device 1 may share some or all of the occupied sub-channels to device 3. Device 2 occupies sub-channel 2 of channel #1 and sub-channel 2 of channel #2, device 2 may share some or all of the occupied sub-channels to device 3.

Case 4: the shared device comprises a shared frequency domain resource which is larger than the frequency domain resources occupied by a plurality of initial devices

Assuming that the frequency domain resource occupied by the first device in the first COT is the fourth frequency domain resource, and the frequency domain resource occupied by the third device in the initialized second COT is the fifth frequency domain resource; the fourth frequency domain resource and the fifth frequency domain resource are included in a sixth frequency domain resource; the sixth frequency domain resource is used for transmission by the second device; the sixth frequency domain resource further includes a seventh frequency domain resource, wherein the seventh frequency domain resource is located in the same channel (channel) as the fourth frequency domain resource and the fifth frequency domain resource and is different from the fourth frequency domain resource and the fifth frequency domain resource.

An example of case 4 can be seen in fig. 9B, where the initial devices are device 1, device 2, device 1 (first device) forming FDM with device 2 (third device). Devices 1,2 may share some or all of the frequency domain resources included within the respective COTs to device 3. As in fig. 9B (a), the initial COT of device 1 includes subchannels 1,2, 3 of channel #1, and device 1 may share some or all of subchannels 1,2, 3 (including subchannel 2 (fourth frequency domain resource) occupied by device 1 within the first COT and unoccupied subchannels 1, 3) to device 3. Similarly, device 2 may also share all or part of the frequency domain resources within its initialized COT, including subchannel 3 occupied by device 2 within the second COT (fifth frequency domain resources) and unoccupied subchannels 1,2, to device 3. As in (a) of fig. 9B, the shared resource (sixth frequency domain resource) of the device 3 includes a seventh frequency domain resource (unoccupied sub-channel 1 within the COT) in addition to the fourth frequency domain resource and the fifth frequency domain resource.

Similar to the principle of fig. 9B (B) and fig. 9B (c), both devices 1 and 2 have authority to share all or part of the frequency domain resources within the respective COTs to device 3.

In combination with the above four cases, the embodiments of the present application provide three methods for sharing resources. Of course, the scenario or situation to which the method of the embodiment of the present application is applicable is not limited to the above four cases, but may be other scenarios or situations. Similarly, any of the methods of any of the embodiments of the present application may be applied to possible other scenarios or situations, not limited to the enumerated scenarios or situations.

The following describes methods for the first device to share the resource through the first sharing indication information:

Method 1: when the first device indicates the COT sharing to other devices, only partial or all frequency domain resources in the frequency domain resources occupied by the first device in the initial first COT are indicated to be shared.

Optionally, the frequency domain resource occupied by the first device in the first COT may be a frequency domain resource occupied by the first device in a first time slot in the first COT; or a frequency domain resource occupied by the last time slot of the first device in the first COT; or the first equipment occupies the frequency domain resources on the time slot with the least frequency domain resources occupied in the first COT; or the first equipment occupies the frequency domain resources on the time slot with the largest frequency domain resources occupied in the first COT; or a frequency domain resource occupied by the first device within the first COT.

Optionally, the occupation may be any of reservation, selection, use for transmission, and the like.

In the embodiment of the application, the resource selected by the first device can be used for the first device to transmit this time, and the resource reserved by the first device can be used for the first device to transmit next time.

Or the frequency domain resources occupied by the first device within the first COT are not limited thereto, all possible scenarios are not exhaustive here.

Illustratively, as shown in fig. 11, the initial device 1 occupies the subchannels 1, 2, 4 on the first time slot (time slot 1) of the initial COT, and the initial device 1 may share all or part of the frequency domain resources in the subchannels 1, 2, 4 to other terminals.

Still as shown in fig. 9C, the slots with the least occupied subchannels in the COT by device 1 are slot 9, slot 10 (both occupied subchannels). Wherein the device 1 occupies the sub-channels 2,4 on the time slot 9 and the sub-channels 1, 4 on the time slot 10. Device 1 may share some or all of the frequency domain resources in subchannels 2,4 (a group of subchannels) to other devices. Or device 1 may share some or all of the frequency domain resources in subchannels 1, 4 (a group of subchannels) to other devices. Or device 1 may determine frequency domain resources from the two sets of sub-channels for sharing to other devices.

Still as shown in fig. 9C, the least occupied time slot of the subchannels in the COT is time slot 2 (occupies four subchannels). Device 1 may share some or all of the frequency domain resources in these four sub-channels to other devices.

Alternatively, method 1 may be applicable to, but not limited to, non-FDM such as fig. 7, 8, or the like, or applicable to FDM scenarios such as fig. 9A, 9B, or the like. The following description will be given by taking cases 1 to 4 of fig. 7 to 9B as examples, respectively:

Taking cases 1, 2 (not related to FDM) such as those shown in fig. 7, 8 as examples: when the device 1 indicates that the COT sharing is allowed through the sharing indication information, the device 3 may attempt to access the channel and transmission through LBT type2 on the indicated shared resource, so as to improve the success rate of accessing the channel by the device 3. That is, when the device 3 receives the COT sharing indication information of the device 1, allowing the use of the shared resource, the device 3 may attempt to access the channel and transmission through the LBT type2 on the indicated shared resource. As in fig. 7, in a scenario that does not involve FDM, device 1 may only share the frequency domain resources occupied by itself within the COT to device 3. As in fig. 8, in scenarios that do not involve FDM, device 1 may share all or part of the frequency domain resources within the COT to device 3, and thus, in some scenarios, the shared resources may be greater than or equal to the frequency domain resources occupied by device 1 within the COT.

Alternatively, in each embodiment of the present application, the first sharing indication information may be COT sharing indication information.

Otherwise, if device 1 does not share the resources within the COT to device 3, or does not allow device 3 to use the shared resources, device 3 may perform LBT type1 to access the channel, or device 3 may perform resource reselection. That is, if the device 3 does not receive the COT sharing indication information of the device 1 or receives the COT sharing indication information indicating that the use of the shared resource is not allowed, the device 3 may perform LBT type1 to access the channel or the device 3 may perform resource reselection.

Taking a case 3 (the shared resources include frequency domain resources occupied by different initial devices) as illustrated in fig. 9A as an example, when both the initial device 1 and the initial device 2 indicate that the COT sharing is allowed through the sharing indication information, the device 3 may use the shared resources to attempt to perform LBT type2 to access the channel and transmission. That is, if the device 3 receives the sharing indication information of the initial device 1 and the initial device 2 at the same time, indicating that the use of the shared resource is permitted, the device 3 may attempt to perform LBT type2 to access the channel and transmission using the shared resource. Otherwise the device 3 performs LBT type1 to access or perform resource reselection.

For example, as shown in fig. 9A (a), the device 1 shares the subchannel 1 occupied by itself in the COT with the device 3, the device 2 shares the subchannel 2 occupied by itself in the COT with the device 3, and the device 3 can transmit on the subchannels 1 and 2.

Optionally, if at least one initial device of the plurality of initial devices indicates that the COT sharing is allowed, the sharing device may determine the shared resource according to the sharing indication information of the initial device that the COT sharing is allowed. That is, if the device 3 receives the sharing indication information of the initial device 1 and the initial device 2 indicating that the use of the shared resource is permitted, the device 3 may attempt to perform LBT type2 to access the channel and transmission using the shared resource.

Taking case 4 as an example, such as fig. 9B, it can be specified in the standard: this is undesirable for devices because the initial device occupies less resources within the COT than the shared device actually requires.

Or if a situation 4 such as that shown in fig. 9B occurs, the sharing device (e.g., device 3) performs a resource reselection.

Or if a situation 4 such as that shown in fig. 9B occurs, the device 1 and/or the device 2 may consider that the condition of the COT sharing is not satisfied, or consider that there is no authority for the COT sharing, the device 1 and/or the device 2 will not share the resource within the COT to the device 3 through the sharing indication information.

Or if a situation 4 such as shown in fig. 9B occurs, when both device 1 and device 2 indicate that COT sharing is allowed, device 3 may receive sharing indication information from device 1 and device 2, then device 3 may attempt LBT type2 channel access and transmission, otherwise use LBT type1 access or perform resource reselection. Thus, in some scenarios, multiple initial devices (such as device 1 and device 2) may share the unoccupied sub-channels in the COT to device 3 through joint indication, so as to increase the number of shared resources used by device 3, and improve the communication performance of device 3.

Optionally, the COT sharing indication information includes at least one of the following information: the shared time domain resource, the shared frequency domain resource, and the identification information of the second device (including at least one of a device ID, a source ID, and a destination ID).

Optionally, the first device may indicate information of a channel on which the frequency domain resource is located, and/or indicate sub-channel information on which the frequency domain resource is located. Alternatively, the information of the frequency domain resource may be indicated by the location information of the indication channel and/or the location information of the sub-channel. Wherein the location information may include at least one of: index, number, start position, end position, offset value. Wherein, the index, the starting position and the ending position can be the conceptual index or position of the physical time slot or the conceptual index or position of the logical time slot. The offset value may be an offset value relative to the COT starting slot or the starting slot of the occupied resource.

Optionally, the time domain resource shared by the first device is within the first device's own COT range (e.g., the maximum length of COT on a standard, such as 10 ms), or the shared time domain resource is within the range of resources selected or reserved by the first device. For example, after the first device initiates the first COT, it may take up to 10ms to transmit, but the first device may not have more transmission requirements, and the first device may select or reserve only a time domain resource such as 5ms, and may share the time domain resource (with a total duration of 5 ms) to the second device.

Optionally, the frequency domain resources shared by the first device to other devices are less than or equal to the frequency domain resources occupied by the first device in the first COT. The resources occupied by the first device may refer to frequency domain resources for the first device to transmit itself or resources for sharing to other devices. For example, in some scenarios, the resources occupied by the first device may be self-selected or reserved resources.

Method 2: the home device may be determined from the initial device, the home device having the authority for the COT sharing.

In embodiments of the application, the home device may be the dominant device or not by name. The meaning of the home device is that only the device has the sharing rights of the COT. Alternatively, only the home device may send the COT sharing indication information, or the sharing may determine whether the resources can be shared and/or shared based only on the indication of the home device.

The method is applicable to scenes of multiple initial devices (such as FDM) and also applicable to scenes of a single initial device. When there are a plurality of initial devices, the home device may be determined according to at least one of the following rules (first condition).

The home equipment is an initial equipment which reserves resources first in a plurality of initial equipment;

The home device is a device which reserves resources in a multi-continuous time slot transmission (multi-consecutive slots transmission, MCSt) mode firstly in the plurality of initial devices; in this way, when considering that the device reserves more time slots, there may be a need to share resources to other devices, so that the device reserved or selecting more time slots can be used as the home device;

The home device is the device of the plurality of initial devices for which the reserved resources are the longest in the time domain (such as, but not limited to, the longest in the MCSt duration);

The home equipment indicates that the sharing of resources to other equipment is allowed through sharing identification information; for example, for instructing the device to allow or intend to do COT sharing (sharing to other devices) in the reserved resources (allowing sharing does not mean actual sharing); the shared identification information may be indicated when the resource is reserved.

The home device is the device with the lowest channel access priority CAPC in the plurality of initial devices;

The home device is the longest COT device of the plurality of initial devices; thus, the permission of COT sharing is given to the device, and the sharing device can acquire more time domain resources (such as 10 ms) and directly complete transmission within 10ms without accessing through type 1, so that the benefit of COT sharing is maximized.

The home device is the device which occupies the most resources in the plurality of initial devices;

the home device is an initial device of the plurality of initial devices, wherein initial time slot resources are reserved earliest;

The home device is the lowest-index device occupying a sub-channel (sub-channel) in the plurality of initial devices; in this manner, alternatively, if the initial device occupies a plurality of subchannels, it may be determined that the subchannel with the lowest index of the occupied subchannels.

The first device is the longest CPE device of the plurality of initial devices;

The home device is a device occupying the most sub-channels (such as occupying the most sub-channels within the COT) among the plurality of initial devices;

the home device being the device of the plurality of initial devices that occupies the most subchannels on the first time slot of the COT);

the home device is the highest L1 priority or CAPC of the plurality of initial devices;

When there are multiple initial devices, the home terminal in the multiple initial devices has authority to share some or all of the resources within the COT. For example, the home device has authority to share all other resources in the COT to other devices except for the resources used by itself and used by other initial devices together. For example, some or all of the other resources may be shared. The devices except the home device in the plurality of initial devices do not have the authority of sharing resources and only can use the resources occupied by the devices in the COT.

Alternatively, the home device may be determined by the initial device (e.g., device 1 and device 2) of the initial COT. For example, only the home device needs to send the sharing indication information. Or the home device is determined by the sharing device (e.g., device 3, device 4, device 5) sharing the COT. For example, the initial devices (e.g., device 1 and device 2) both send sharing indication information, and the sharing devices (device 3, device 4, device 5) determine the home device and determine whether to allow COT sharing and/or sharing of resources as indicated by the home device.

Optionally, the sharing indication information sent by the initial device includes: the shared time domain resource, the shared frequency domain resource, and identification information (at least one of a device ID, a source ID, and a destination ID) of the second device.

The time domain resource, the indication manner of the frequency domain resource, and the like may refer to other embodiments, and are not described herein.

Alternatively, method 1 may be applicable to non-FDM such as fig. 7, 8, or the like, or to FDM scenarios such as fig. 9A, 9B, or the like. The following description will be given by taking cases 1 to 4 of fig. 7 to 9B as examples, respectively:

Taking cases 1,2 such as those shown in fig. 7, 8 as an example, when device 1 indicates that COT sharing is allowed, device 3 may attempt LBT type2 access and transmission, otherwise use LBT type1 access or perform resource reselection. That is, when the device 3 receives the COT sharing indication information of the device 1, allowing the use of the shared resource, the device 3 may attempt to access the channel and transmission through the LBT type2 on the indicated shared resource. In a scenario that does not involve FDM, device 1 may share all or part of the frequency domain resources within the COT to device 3. Thus, for example, in some scenarios such as that shown in fig. 8, the shared resource may be greater than or equal to the frequency domain resource occupied by device 1 within the COT, for example, in some scenarios such as that shown in fig. 7, the shared resource may be less than or equal to the frequency domain resource occupied by device 1 within the COT.

Take case 3 such as shown in fig. 9A as an example: when both device 1 and device 2 indicate that COT sharing is allowed, device 3 may determine that the home device (e.g., device 1), meaning that only device 1 has the right to share resources within the COT, device 3 may attempt LBT type2 access and transmission on the shared resources as indicated by device 1. That is, when the device 3 receives the COT sharing indication information of the device 1 and the device 2, allowing the use of the shared resource, the device 3 may attempt to access the channel and transmission through the LBT type2 on the indicated shared resource. Or a home device (such as device 1) in device 1 or device 2 indicates that COT sharing is allowed, and device 3 attempts LBT type2 access and transmission on the shared resource as indicated by device 1. That is, when device 3 receives the COT sharing indication information of the home device (such as device 1) in device 1 or device 2, and allows the shared resource to be used, device 3 may attempt to access the channel and transmission over LBT type2 on the indicated shared resource. Otherwise, when the device 3 cannot acquire the shared resource, LBT type1 is used for accessing or resource reselection

Take case 4 such as shown in fig. 9B as an example: when both device 1 and device 2 indicate that COT sharing is allowed, device 3 receives sharing indication information of device 1 and device 2, or when the home terminal indicates that resources within the COT can be shared, device 3 may attempt LBT type2 access and transmission on the shared resources as indicated by the home terminal. That is, when the device 3 receives the COT sharing indication information of the device 1 and the device 2, allowing the use of the shared resource, the device 3 may attempt to access the channel and transmission through the LBT type2 on the indicated shared resource. Otherwise, when the device 3 cannot acquire the shared resource, LBT type1 is used for accessing or resource reselection

Method 3: when the first device indicates to other devices that the COTs are shared, the first device may indicate to share some or all of the frequency domain resources within the first COT (including frequency domain resources occupied by the first device itself within the first COT and/or frequency domain resources unoccupied by the first device itself within the first COT).

Alternatively, the shared resource may be part or all of the frequency domain resources in the channel (channel) where the resource occupied by the first device is located.

The method may be applicable to FDM scenarios or non-FDM scenarios.

Optionally, the sharing indication information sent by the initial device (such as device 1 and/or device 2) includes: the shared time domain resource, the shared frequency domain resource, and identification information (at least one of a device ID, a source ID, and a destination ID) of the second device.

Alternatively, take cases 1,2 (not involving FDM) such as shown in fig. 7, 8as examples: when device 1 indicates that COT sharing is allowed, device 3 may attempt LBT type2 access and transmission, otherwise use LBT type1 access or perform resource reselection.

Taking cases 3, 4 such as those shown in fig. 9A, 9B as an example: when either device 1 and device 2 indicate that COT sharing is allowed, device 3 may attempt LBT type2 access and transmission, otherwise use LBT type1 access or perform resource reselection. That is, when the device 3 receives the COT sharing indication information of any one of the device 1 and the device 2, and allows to use the shared resource, the device 3 may attempt to access the channel and transmission through the LBT type2 on the indicated shared resource, otherwise, access or perform resource reselection using the LBT type 1.

Or alternatively, if device 1 does not indicate to share resources in COT to device 3 or does not wish to share COT resources to device 3, device 1 may exclude time-frequency resources of device 3, or exclude all frequency-domain resources on a time slot in which time-frequency resources are located, or exclude all frequency-domain resources in a channel in which time-frequency resources are located on a time slot in which time-frequency resources are located, from transmitting on resources of device 3 when resources are selected or reserved. For example, other frequency domain resources of the time slot in which the device 3 is located may be selected for transmission.

Illustratively, as in (a) of fig. 9A, the device 2 instructs sharing of the resources (diagonally-marked resources) within the COT to the device 3 at the time of the last resource reservation. Assuming that the device 1 does not intend to share resources to the device 3 at the last reservation of resources by the device 1, the device 1 may exclude the resources of the device 3 (diagonally-marked resources). In this way, subsequently, device 3 may attempt to access and transmit using type2 on the diagonally marked resource as instructed by device 2, while device 1 will not transmit on the diagonally marked resource because it is excluded, so that device 3 will not collide with device 1 on the diagonally marked resource.

Taking cases 3, 4 such as those shown in fig. 9A, 9B as an example: only when multiple initial devices (e.g., device 1, 2) each indicate a COT sharing, is sharing of resources within the COT to other devices (e.g., device 3) allowed. In this way, the problem of resource conflict caused by indication inconsistency between the initial devices can be avoided.

Alternatively, if device 1 does not share resources with device 3, device 1 may select the time-frequency resources of device 3 for transmission without excluding the time-frequency resources of device 3 when selecting or reserving resources.

For the above method 1, method 2, method 3:

Alternatively, when the device 2 selects or reserves resources, the resources selected or reserved by the device 1 are acquired according to the awareness, and if the device 2 needs to select the resources FDM with the resources of the device 1, the first time slot in the resources selected or reserved by the device 2 should be aligned with the first time slot of the resources selected or reserved by the device 1. As such, device 2 and device 1 may together form an initial COT, or the resources of device 1 and device 2, in the frequency domain.

Illustratively, as in fig. 5A, the first time slot of the resource selected or reserved by device 2 (time slot 1) is aligned with the first time slot of the resource selected or reserved by device 1. As such, device 2 may attempt LBT type2 access. Otherwise, if the first time slot (time slot 1) of the resource selected or reserved by the device 2 is not aligned with the first time slot of the resource selected or reserved by the device 1, whether the device 2 can access the channel depends mainly on whether the device 1 shares the resource to it, if the device 1 does not share the resource to the device 2, the device 2 can only attempt LBT type2 access, and the success rate of accessing the channel is low.

Optionally, if the COT lengths of the device 1 and the device 2 are different, or the time domain durations of the occupied resources are different, for the resources where the two resources in the time domain do not overlap, the COT sharing authority of the frequency domain resource belongs to the terminals with more time domain resources.

For example, as shown in fig. 5A, the time domain resource included in the first COT of the device 1 is a first time domain resource (time slots 1,2, 3), the time domain resource included in the second COT of the device 2 is a second time domain resource (time slots 1, 2), and the duration of the first time domain resource is longer than the duration of the second time domain resource.

Optionally, when the second condition is met, the initial device sends the sharing indication information.

The second condition includes at least one of the following conditions:

The access channel priority of the second device is higher than that of the home device;

the target device of the second device comprises the home device.

Wherein CAPC of the first device and the third device may refer to: the first device, the third device initiates CAPC of the COT, or CAPC indicated in the COT indication information.

Alternatively, the methods 1 to 3 may be applied to any of the following scenarios:

The resource pool is configured to allow (initial) FDM, where the initial FDM actually occurs, and the transmission does not occupy the entire channel (FDM is likely to occur). Otherwise, the initial COT of the device 1 has a frequency domain range of the entire channel (occupies the entire channel), that is, the resources in the entire channel belong to the device 1, which can be used or shared to other terminals.

In some embodiments, the mechanism of COT sharing may be:

Mechanism 1: the device 3 performs resource reservation first, reserving resources for own transmission; when the device 1 and/or the device 2 (the device of the initial COT) performs resource selection, the resource selection is performed according to the reserved resource of the device 3, and it can be determined whether the device 3 satisfies the COT sharing condition and whether the resource is shared to the device 3.

Alternatively, if device 1 or device determines to share resources to device 3, then the starting location in the time domain of the resources selected/reserved by device 1 and/or device 2 is before the resources of device 3.

Alternatively, when the device 1 and/or the device 2 performs resource selection, the selected resource may include a resource shared to the device 3. If shared, device 1 and/or device 2 may not exclude resources reserved by device 3. If not shared, device 1 and/or device 2 may exclude resources reserved by device 3.

Alternatively, when the device 1 and/or the device 2 performs resource selection, the selected resource may not include the resource shared to the device 3. Optionally, device 1 and/or device 2 exclude resources reserved by device 3.

Mechanism 2: device 1 and/or device 2 (the device of the initial COT) first reserve resources; when the device 3 performs resource selection, a next time slot of the resources reserved at the device 1 and/or the device 2 may be reserved, or resources of the resource FDM reserved with the device 1 and/or the device 2 may be reserved, so that the device 1 and/or the device 2 may share with the device 3.

Optionally, the resources reserved by device 3 are located within the initial COT of device 1 and/or device 2.

Example two

The present embodiment may provide a method for configuring CPE such that the actual interval between two transmissions satisfies the LBT duration and such that LBT blocking does not occur between transmissions using FDM resources. As shown in fig. 9D, the method includes:

s301, the first device determines CPE information.

Optionally, the CPE information may refer to a CPE length, or a CPE start position. For example, (pre) configuration CPE length or CPE start position.

The present embodiment may provide a method for configuring CPE, where each method is described as follows:

Method 1: different CPE and/or LBT types may be configured or preconfigured for the device for different situations.

The first device determining CPE information comprising: the first device obtains first information, where the first information is used to determine CPE information. Different access types associate different first information and/or different time slots associate different first information.

Optionally, the CPE information includes CPE associated with a time slot (per slot). In other words, terminals transmitting on different time slots within the resource pool may have different CPEs. For example, as shown in fig. 10, the CPE for device 1 is 50us when transmitting on slot 1 and 60us when transmitting on slot 2.

Alternatively, CPE of type1 LBT (device corresponding to initial COT (initial device)) and type2 LBT (device corresponding to shared COT (shared device) or continuously transmitted device) may be configured or preconfigured, respectively. For example, device 1 performs type1 LBT, initializes COT, and shares resources within COT to device 3. Then, the CPE of device 1 and the CPE of device 3 may be configured separately. Alternatively, the CPE of the devices 1, 3 may be configured identically or differently.

Alternatively, the CPE of the type1 LBT, the CPE of the first type2 LBT (corresponding to a device or transmission using the COT shared resource), and the CPE of the second type2 LBT (corresponding to a transmission by a device of the initial COT within the COT, i.e., a transmission on a time slot other than the first time slot in the transmission of the initial device within the COT, a CPE used when channel access needs to be performed) may be configured or preconfigured, respectively.

In the embodiments of the present application, the configuration or the pre-configuration may refer to the configuration or the pre-configuration by different parameters respectively. But the results of the configuration or pre-configuration may be the same or different.

Illustratively, device 1 initializes the COT and shares resources within the COT to device 3, and device 1 transmits over a plurality of time slots. Optionally, the plurality of time slots are consecutive. Then, CPE used by device 1 before transmission of Type1 LBT, CPE used by device 1 to transmit on other time slots than the first time slot within the COT, CPE of device 3 may be respectively configured. Alternatively, the three CPEs may be configured to be identical or different, or partially identical or different. For example, the COT initialized by the device 1 includes time slots 1-3 in the time domain, and the device 1 is configured to use CPE with a duration of T1 before transmission of Type1 LBT, the device 1 is configured to use CPE with a duration of T2 when transmitting in the COT, and the CPE with a duration of T3.

In this way, different CPEs can be flexibly configured for the equipment according to different situations (such as different time domains pattern or types 1/types 2), so that the probability of resource collision between the equipment can be reduced, and the flexibility of adopting different CPEs and/or corresponding LBT types between different equipment or different transmission is improved.

In the above example of configuring the CPE, in other embodiments, the LBT type may also be configured, and the device may determine the CPE according to the LBT type. For example, one symbol may have a duration of 72us, and assuming a LBT of 25us is configured, the device may infer that the CPE is 72-25=47 us. Alternatively, the device may determine the corresponding LBT type according to the CPE.

Method 2: if the condition is satisfied, the configured or preconfigured CPE is not used, otherwise, the configured or preconfigured CPE is used

The first device determining CPE information comprising: the first CPE determines, when at least one of a first condition is satisfied, the first CPE determines from second information, the second information being configured or preconfigured, the first condition comprising: the first transmission is CG transmission; or the first transmission is a primary transmission; or FDM is not allowed in the resource pool; or no other transmission is performed on other frequency domain resources on the time slot where the resource of the first transmission is located; or the resources of the first transmission include all of the frequency domain resources within the channel (meaning that FDM is not formed with the resources of other devices).

The initial transmission refers to a transmission without resource reservation before the current transmission, or the resources used by the transmission are not reserved by the terminal before. FDM is not allowed in the resource pool, and may be implemented by configuration or pre-configuration. The absence of other transmissions on other frequency domain resources on the time slot where the first transmission resource is located may refer to no FDM transmission on the time slot, or only the first transmission on the time slot where the first transmission resource is located.

Optionally, the constraint of FDM is within a channel (channel) where the first transmission resource is located. I.e., on the slot, if there are other transmissions on other channels that are not used by the first transmission, the FDM is not considered.

Method 3: initial device dynamic indication of CPE and/or LBT type

In some embodiments, the initial device determines and instructs the CPE when reserving resources for the next transmission. Therefore, other initial devices or shared devices can determine CPE according to the indication of the initial device so as to align the CPE of the other initial devices with the CPE of the initial device, and further the success rate of accessing the channel can be improved.

The first device determining CPE information comprising: the first device receives third information and/or fourth information; the first device determines the CPE information according to the third information and/or the fourth information; the third information is used for indicating CPE information by the second equipment, and the fourth information is used for indicating CPE information by the third equipment.

Optionally, the CPE information indicated by the third information is CPE applicable to the initial COT of the second device or resources reserved by the second device, or the CPE information includes: CPE associated with the initial COT of the second device or a time slot within a resource reserved by the second device.

Optionally, the CPE information indicated by the fourth information is a CPE applicable to the third device initial COT or a resource reserved by the third device, or the CPE information includes a CPE associated with a time slot within the third device initial COT or the resource reserved by the third device. Alternatively, each time slot indicates a CPE, respectively, and may be the same or different.

Optionally, the third information is carried on the first stage SCI or the second stage SCI of the second device, and/or the fourth information is carried on the first stage SCI or the second stage SCI of the third device.

Optionally, the third information is carried in first COT sharing indication information, where the first COT sharing indication information is used to share resources in an initial COT of the second device.

Optionally, the fourth information is carried in second COT sharing indication information, where the second COT sharing indication information is used to share resources in the initial COT of the third device.

For the third information and/or the fourth information, optionally, the CPE of the next transmitted COT is indicated at resource reservation, or the CPE of the current COT is indicated in the first time slot or slots at initial COT and transmission.

For the third information and/or the fourth information, optionally, the COT sharing indication information may also be called COT indication information, COT sharing information, COT structure information, and the like.

Alternatively, the method of the present embodiment may be used in combination with the corresponding method of the first embodiment.

S302, the first equipment determines a starting position and/or a channel access type of transmission according to the CPE information.

Optionally, the first device determines the CPE according to at least one of the methods 1-3 above, and determines the starting position of the transmission and/or the length of the CPE and/or the starting position of the CPE according to the CPE.

Or the first equipment determines the starting position of transmission and/or the length of the CPE and/or the starting position of the CPE according to the CPE information indicated by the home equipment. The definition of the home device may refer to S101 in the first embodiment.

S303, the first equipment performs channel access according to the starting position and/or the channel access type of the transmission.

S304, sending the first transmission.

The following applies to the processes/steps/methods of S301-S304:

In case a certain initial device has indicated a CPE, the initial device uses its own determined and indicated CPE for transmission. In some scenarios, if other original equipment forms an original FDM with the original equipment, the CPE of the other original equipment needs to be aligned with the CPE of the original equipment. In other scenarios, if another device (the original device or the shared device) forms an in-COT FDM with the original device, the CPE of the other device needs to be aligned with the CPE of the original device.

Illustratively, as in fig. 11, the device 1 initializes the COT and indicates the duration of the initial CPE as T1 by the sharing indication information. Device 2 initializes and forms an initial FDM with the resources of device 1. To avoid blocking or jamming of device 1 by device 1, the CPE of device 2 needs to be aligned with the CPE of device 1. Specifically, device 2 determines its own initial CPE (CPE 4) to be T1 in duration. Thus, the duration of the initial CPE of the equipment 1 is the same as that of the initial CPE of the equipment 2, blocking access (the equipment with short CPE cannot be accessed) caused by different CPE durations of different equipment can be avoided, and the success probability of equipment access to the channel is improved.

Still by way of example, as in fig. 11, the device 1 may also indicate the duration T2 of the CPE within the COT by sharing the indication information. Device 2 initializes and forms an in-COT FDM with the resources of device 1 within the COT. To avoid blocking by device 1 or blocking device 1, device 2 determines that its own CPE within the COT (CPE 5) duration is also T2.

As another example, as shown in fig. 12, the device 1 may indicate the duration T2 of the CPE within the COT through the sharing indication information, and may indicate that a part of the resources within the COT are shared to the device 3 through the sharing indication information. To avoid blocking by device 1 or blocking device 1, device 3 determines that its own CPE within the COT (CPE 3) duration is also T2.

It will be appreciated that in the case where some initial device has indicated a CPE, the shared device may or may not determine its CPE based on the indication. The following is introduced separately in two cases:

Case 1: CPE indicated by the shared device according to the initial device

In this case, all sharing devices in the COT can determine unified CPE according to the indication of the initial device, and CPE alignment between the sharing devices is performed, so that access between the sharing devices is not blocked due to different CPE.

Optionally, the granularity of the initial device indication CPE is based on a per-channel occupancy time (per COT) indication.

Or the original device indicates that the granularity of the CPE is per slot. Therefore, different CPEs can be indicated in different time slots, and the flexibility of indication is improved.

Optionally, if there are a plurality of initial devices, only one of the plurality of initial devices indicates the COT sharing through the sharing indication information, the sharing device transmits according to the CPE and/or the LBT type indicated by the initial device. If two or more of the plurality of initial devices indicate COT sharing, the sharing device determines CPE according to the indication of the home device.

Alternatively, the method for determining the home device from the plurality of initial devices may refer to the foregoing embodiment, and will not be described herein.

The initial devices are device 1 and device 2, where device 1 and device 2 each indicate to share resources in the COT to device 3 and device 4 through sharing indication information, where the sharing indication information carries CPE and/or LBT type. Both devices 3,4 may determine CPE as directed by the home device (e.g., device 2).

Case 2: the shared device does not determine the CPE according to the indication of the initial device, and the shared device can determine the CPE by itself

Alternatively, the sharing device may determine the CPE at the time of resource selection or resource reservation.

Alternatively, to avoid blocking access among multiple devices of the FDM, the CPE of the shared device should be consistent with the CPE of the device that previously reserved the resource. For example, as in fig. 13, device 3 first selects or reserves resources. The shared device 4, when selecting or reserving resources, needs to align with the CPE of the device 3 if it wants to select or reserve resources that form a frequency division multiplex with the device 3, otherwise it would be possible for the device 3 to block access. In one example, when selecting or reserving resources, device 4 listens to the resource indication information of device 3 and aligns with the CPE of device 3 according to the resource indication information (which may be indicative of the CPE). Alternatively, after determining the CPE, the device 4 may indicate the CPE through the resource indication information. Subsequently, other devices may listen to the resource indication information of device 4 in order to learn the resources selected or reserved by the device, as well as learn the CPE of device 4.

Therefore, when the shared equipment selects or reserves the resources, CPE alignment between the equipment can be performed according to the resource indication information intercepted by other equipment (such as the shared equipment), so that access blocking caused by different CPEs between the equipment is avoided, and the success rate of the equipment for accessing the channel is improved.

Optionally, the device transmits in the resource pool, following at least one of the following conditions:

FDM or COT sharing is not allowed when the resource pool enables continuous transmission cancellation GAP. When the GAP is canceled, there is no time left for the other device to perform LBT, and the other device cannot access successfully. Thus, by constraining, if GAPs are eliminated, FDM is not supported/allowed, and other devices can be made to exclude the entire slot when selecting resources.

Or when the resource pool enables FDM or actually FDM or COT sharing, the device reserves the last GAP symbol in the slot at the time of transmission. Alternatively, the FDM actually occurs may be understood that there are no other transmissions on other frequency domain resources in the time slot where the resource of the first transmission is located, or there are no FDM transmissions in the time slot, or there are only the first transmissions in the time slot where the resource of the first transmission is located. Thus, in the FDM scenario, GAPs are not canceled, so as to avoid that the channel access of the FDM device is unsuccessful.

Either in the starting slot of the shared transmission or in the slot preceding the slot of the FDM transmission, the device reserves the last GAP symbol in the slot at the time of transmission, or does not allow GAP cancellation, or does not cancel GAP, or reserves GAP. As such, GAP symbols are reserved at the end of the previous slot, at least for the FDM slot, to reserve FDM time for the device, or to reserve time for the shared device to perform channel access.

Or the device reserves the last GAP symbol of the last slot transmission of the plurality of consecutive slot transmissions. In this way, at least the COT sharing can be performed, and other devices can select the next time slot for access.

Optionally, FDM or COT sharing is not allowed for when the resource pool enables continuous transmission cancellation GAP. Optionally, when the device performs resource selection or resource exclusion, all resources on the time slot where the resources reserved by other devices are located are excluded, or all resources on the time slot where the resources reserved by other devices performing multi-continuous time slot transmission or multi-continuous time slot resource reservation are located are excluded.

In the embodiments of the present application, excluding reserved resources can also be expressed as: and excluding candidate resources overlapped with the reserved resources.

In addition to the protected resource exclusion conditions, at least one of the following conditions is optionally required to be satisfied for resource exclusion in embodiments of the application:

The physical layer priority of the reserved resource is higher than the physical layer priority of the resource selection (or the value of the physical layer priority of the reserved resource is smaller than the value of the physical layer priority of the resource selection); the RSRP or RSSI of the reserved resources is above a first threshold. (the first threshold is configured or preconfigured).

Illustratively, as in fig. 12, device 1 shares a portion of the frequency domain resources within slot 2 of the COT to device 3. The GAP is not allowed to cancel in the previous slot (slot 1) of transmission 2 (start position of shared transmission). As such, device 3 may perform LBT within the GAP in order to access the channel. After accessing the channel, the device 3 may send transmission 2 and subsequent transmissions using the shared time-frequency domain resources.

In this way, in the scenario where the device (e.g., device 1) transmits in a plurality of consecutive time slots, the GAP in the last time slot of the plurality of time slots cannot be canceled, so that other devices (e.g., sharing device 3) can perform LBT through the GAP, thereby improving the success rate of accessing channels by other devices.

According to the scheme, through alignment of CPE, the probability of LBT blocking can be reduced, transmission in an FDM scene can be ensured, and communication performance and system efficiency are improved.

Example III

The technical scheme of the embodiment can be applied to IRB scenes or other scenes.

The S-SSB may interfere with other devices when the devices transmit the S-SSB within the COT or the devices transmit the S-SSB within selected or reserved resources. There are several solutions possible with this embodiment as follows. The following describes the various schemes taking the device transmitting S-SSB as an example of the device 1.

Fig. 14 shows a flow of a communication method according to an embodiment of the present application, where the method includes:

S401, the first device initiates a first COT.

Before the first S-SSB is sent, it is determined that at least one of the following conditions is satisfied:

Mode 3 (condition 3): when the transmission of the first device does not actually generate FDM on any time slot in the COT or the reserved resource, or when the first time slot of the COT or the reserved resource does not generate FDM, or when different devices do not generate other transmissions on the same time domain resource FDM, or other frequency domain resources on the time slot where the transmission resource is located; or the transmitted resources include all frequency domain resources within the channel (meaning that FDM is not formed with the resources of other devices).

In one possible design, the frequency domain resource of the candidate resource selected by the first device, or the frequency domain resource of the reserved resource, is the maximum number of frequency domain resources or the maximum frequency domain range required for any transmission in the COT, or the number of frequency domain resources required for the S-SSB, or all frequency domain resources in the channel, such as all sub-channels in the channel.

Or alternatively reserved for the subchannels that S-SSB needs to use. For example, assuming that the S-SSB needs to use 2 sub-channels as the S-SSB occupies the same frequency domain resources per slot, device 1 may select or reserve 2 sub-channels. Subsequently, device 1 may transmit S-SSB on these 2 subchannels or within a COT (which is initialized according to the 2 subchannels selected or reserved).

Or alternatively, the device 1 may reserve resources according to the most frequency domain resources (or the largest frequency domain range) that are needed for any transmission in the COT, and reserve as many resources as possible for the S-SSB.

For example, COT exists for transmissions 1-5, where transmission 5 requires the most frequency domain resources to use (assuming 5 sub-channels 1-5), then device 1 may select or reserve 5 sub-channels to be able to reserve as much resources as possible for S-SSB.

Or alternatively, the S-SSB needs to occupy continuous frequency domain resources, and the device 1 may reserve all sub-channels where the S-SSB occupies the resources. Optionally, the resource allocation manner or the resource occupation manner is IRB.

S402, the first device sends a first S-SSB on a second resource.

Aiming at the scene of PSSCH/PSCCH resource occupation mode of IRB, considering that some transmission (such as S-SSB transmission) possibly occupies continuous resources, and some sub-channels or interfaces are not available, in the embodiment of the application, the resources which conflict with each other can be eliminated through the resource selection or reservation process, so that the normal transmission of the S-SSB of the equipment can be ensured, the frequent resource reselection of other equipment can be avoided as much as possible, and the synchronization performance and the communication performance of the system are improved.

The embodiment of the application also provides a communication method, and the second equipment can exclude the first resource so as not to collide with the first equipment. As shown in fig. 15, the method includes:

S501, the second device determines a third resource, where the third resource does not overlap with the first resource, or the third resource does not overlap with all resources on the timeslot excluding the first resource.

Optionally, the second device excludes the first resource, or excludes all resources on the time slot where the first resource is located further includes: receiving first indication information from the first device, and performing resource exclusion according to the first indication information, wherein the first indication information is used for indicating at least one of the following:

Illustratively, taking the first device as device 1 as an example, if device 1 is ready to transmit an S-SSB in a selected or reserved resource, or in an initial COT according to the selected or reserved resource, other devices may avoid collision with the S-SSB of device 1 through resource selection or reservation.

Optionally, when the other device performs resource selection or reservation, any time-frequency resource selected or reserved by the excluding device 1 for transmission (including the resource used for transmitting data and S-SSB), and/or the time-frequency resource selected or reserved by the excluding device 1 for transmitting S-SSB (excluding only the resource of S-SSB), and/or the time-frequency resource selected or reserved by the excluding device 1 for the first resource (such as the first time slot) in the time domain of transmission, the time-frequency resource of other time slots need not be excluded.

Or when other devices perform resource reservation or resource selection, the excluding device 1 selects or reserves a time slot in which any resource used for transmission is located, and/or the excluding device 1 selects or reserves a time slot in which a resource used for sending S-SSB is located, and/or the excluding device 1 selects or reserves a time slot in which a first resource is located (a first time slot) in a time domain used for transmission.

In this way, FDM can be avoided between the device 1 and the resources of other devices, so that resource collision and interference between the devices can be reduced.

Or alternatively, when the other devices select or reserve resources, all resources of the time slots in the channel are excluded, or all resources of the time slots in the resource pool are excluded.

Or alternatively, when other devices perform resource reservation or resource selection, the first time slot in which the selected or reserved resource is located is different from the first time slot in which the device 1 selects or reserves the resource for transmission.

Alternatively, if the other device finds, through reevaluation, that the above-described resource selection or reservation condition is not satisfied, a resource reselection may be performed. In this way, resource collisions with the S-SSB of the device can be avoided.

In some embodiments, device 1 may indicate by a message that S-SSB will be transmitted within/to be within the resources selected or reserved for transmission, or within the initial COT according to the selected or reserved resources.

Optionally, when the device 1 performs resource selection or reservation, at least one of the following is indicated in the first level lateral control information (sidelink control information, SCI) or the second level SCI; or the device 1 indicates in the first time slot selected or reserved, or in the first stage SCI or second stage SCI in the first time slot of the initial COT according to the selected or reserved resource, at least one of the following information:

Resources that other devices are not allowed to select or reserve with their own FDM of resources (e.g., indicated by 1 bit);

S-SSBs (e.g., indicated by 1 bit) will be sent within the resources or the COT;

And transmitting the information of the time domain resource and/or the frequency domain resource of the S-SSB.

Alternatively, the information of the time domain resource and/or the frequency domain resource may be indicated by at least one of a time domain resource indication value (time resource indication val devices, TRIV), a frequency domain resource indication value (freq device ncy resource indication val devices, FRIV), and a bitmap (bitmap).

Alternatively, when indicating the time domain resource, the location of the time domain resource in a physical time slot (system frame), or in a logical time slot, or in a selected or reserved resource may be indicated. Alternatively, the location may be an index. For example, the SL-U is configured with slots 0, 8, and 10 of 10 slots, and the logical indexes of these three slots may be 0, 1, and 2. Wherein slots with logical indexes 0, 1 are allocated to device 1 for transmitting S-SSB. As another example, device 1 reserves 10 slots and instructs the 3 rd-5 th slot to use for transmitting S-SSB.

Optionally, the information of the frequency domain resource includes at least one of a channel (channel) and a subchannel.

Alternatively, the frequency domain resources may also be (pre-) configured. In this way, blind detection in the frequency domain can be avoided.

In some embodiments, when other devices perform resource selection or reservation, if CAPC (or physical layer priority) of the service performing the resource selection is lower than any resource of device 1, or S-SSB of device 1, or the whole of each resource of device 1 (one comprehensive priority is available according to all the resources), or CAPC (or physical layer priority) of the first resource of device 1 in the time domain, the corresponding resource of device 1 is not excluded, otherwise the corresponding resource of device 1 is not excluded. In other words, if the priority of the corresponding traffic of the other device is higher than the priority associated with the corresponding resource of device 1, the other device may occupy the selected or reserved resource of device 1 for transmission to meet the transmission requirements of the high priority traffic. Otherwise, if the priority of the corresponding service of the other device is lower, the other device cannot preempt the resource of the device. It will be appreciated that the higher the priority, the smaller the priority value.

And/or, optionally, when any resource of the device 1 (the priority of each resource may be different), or the S-SSB of the device 1, or the whole of the resources of the device 1, or the reference signal received power (REFERENCE SIGNAL RECEIVED power, RSRP) or the received signal strength indication (RECEIVED SIGNAL STRENGTH indication/indicator, RSSI) of the first resource of the device 1 in the time domain is higher than the first threshold, the other device excludes the corresponding resource of the device 1, otherwise does not exclude the corresponding resource of the device 1.

In other words, when the device 1 has selected or reserved resources and the other devices detect that the signal strength of the device 1 is high, the influence of the device 1 on itself is considered to be large, and therefore, the other devices need to exclude the resources of the device 1 so as not to collide with the device 1, and the transmission performance of the device is affected. Conversely, if the other device detects that the signal strength of the device 1 is low, which means that the device 1 has a small influence on itself, the other device may not exclude the resources of the device 1. Thus, in some scenarios, other devices may occupy the resources of the device 1 to transmit, and may not be interfered by the device 1, or may be interfered by the device 1 to a low degree, so that normal transmission can be ensured.

S502, the first device sends S-SSB on a third resource.

The second device receives the S-SSB on a third resource.

Optionally, channel access (LBT) needs to be performed before the second device transmits on the third resource.

In the above scenario where the S-SSB is mainly transmitted by the device 1, other devices avoid collision with the device 1 through resource exclusion and resource selection (the device 1 transmits the SSB, and the other devices avoid). For the device 1 that needs to transmit the S-SSB, the device 1 may also avoid, through the resource selection and exclusion procedure, a collision with the device that has reserved the resource (send or not send the S-SSB) (other devices transmit, and when the device 1 transmits the SSB, the device needs to avoid the resources of the other devices). The specific implementation manner may be referred to the above embodiments, and will not be described herein.

Alternatively, for any of S401, S402, and S501, S502, etc.:

alternatively, the device may perform a resource reselection if a resource collision situation occurs.

Optionally, the resource reselection is performed by a device that does not transmit an S-SSB, or by a device that transmits an S-SSB, or by a CAPC lower device, or by a device with a lower physical layer priority.

Optionally, the S-SSB is an additional S-SSB, or a dynamic S-SSB, or a device-SPECIFIC S-SSB.

Optionally, the PSSCH/PSCCH transmission is based on IRB, or the resource pool enables IRB-based PSSCH/PSCCH transmission, or the resource allocation manner or the resource occupation manner is IRB.

Optionally, the transmission mode of the S-SSB includes at least one of the following: "PSBCH interface transmission, S-PSS/S-SSS continuous transmission", "S-SSB (PSBCH and S-PSS/S-SSS) frequency domain repeated transmission, or S-SSB frequency domain continuous transmission".

Alternatively, the above-mentioned resources selected or reserved by the device may be used for transmission of at least one of PSSCH/PSCCH, S-SSB, PSFCH.

Optionally, the S-SSB transmission of the device is transmitted in the last slot within the initial COT or in the last slot in the reserved resources of the device.

Optionally, the device indicates at least one of the following in the first level or second level SCI: the time domain location (slot index, including any one of physical slot index, logical slot index, relative index within the COT or reserved resources), frequency domain location (RB set index or channel index), whether to send the S-SSB (1 bit) within the present COT or within reserved resources, COT location (any one of total COT length, COT start location, COT end location, and COT remaining duration), reserved resource time domain location (any one of time domain start location, time domain end location, and number of slots).

Alternatively, the SCI is located on the first time slot of the COT or reserved resource (S-SSB for indicating the current COT or S-SSB in the next transmission/reservation), or on the last time slot of the COT or reserved resource.

In this way, in the last slot transmitting S-SSB, in a multi-RB set scenario, it can be avoided that transmitting S-SSB on only one RB set results in COT loss/interruption of the other RB set.

Example IV

This embodiment relates to S-SSB OCB and channel loss, which may be decoupled from other embodiments, may be used in combination with other embodiments, or may be used alone. As in fig. 16, the method may include:

s801, the first device initiates a first COT.

S802, the first device sends S-SSB on a fourth resource.

Accordingly, the second device receives the S-SSB on the fourth resource.

Alternatively, if the device intends to transmit an S-SSB in the first time slot, the S-SSB is transmitted independently or data is transmitted on each channel for data transmission or on each channel within the resource pool, except for the channel where the (pre) configured S-SSB frequency domain location is located.

Alternatively, if the device intends to receive the S-SSB in the first time slot. Alternatively, the device shares part or all of the frequency domain resources of the time slot on each channel used for data transmission to other devices except for the channel on which the (pre) configured S-SSB frequency domain location is located. Alternatively, if the S-SSB is not intended to be transmitted nor received in the first slot, the S-SSB should be transmitted on each channel for data transmission, or the data should be transmitted, or part or all of the frequency domain resources of the slot on each channel should be shared to other devices.

TABLE 7

Example five

When there are multiple propagation types and/or transmission of multiple enabling information within the reference duration, the device may adjust CWp according to the respective propagation types and/or respective enabling information therein. Specifically, as shown in fig. 17, the method includes the following steps:

s201, determining parameters of channel access according to the first propagation type and/or the first enabling information.

Alternatively, step S201 may be performed by the first device.

Optionally, S200, determining the first propagation type and/or the first enabling information (not shown in the figure) may be further included before S201.

Alternatively, step S200 may be performed by the first device.

Accordingly, the second device is a receiving device of the first device and/or the first device is a receiving device of the second device.

The first propagation type is a propagation type associated with the first side line information, and/or the first enabling information is enabling information associated with the first side line information. Optionally, the side-line transmission of the first propagation type is transmitted (e.g., sent) by the first device. Optionally, the first sidelink information is at least any one of retransmission of a sidelink transmission, periodic transmission, and retransmission of a periodic transmission of the first propagation type. The first side information is the first side information sent on the channel after accessing the channel.

In some embodiments, the parameters of the channel access include at least any one of LBT type, channel access priority CAPC, contention window CW _p, minimum value CW _min,p of the contention window, maximum value CW _max,p of the contention window, initial value N _init、T_d、T_sl、T_f、m_p of LBT cycle number N, LBT cycle number, maximum channel occupation time T _ulmcot,p, and candidate value list of the contention window CW _p.

Taking the channel access parameter as the contention window CWp as an example, the adjustment CWp is performed to avoid collisions with other devices. E.g., poor channel conditions, the value of CWp is increased and multiple listens for a period of time if the channel is idle. As another example, if the channel conditions are good, then the value of CWp is reduced and there is less listening to whether the channel is idle for a period of time. As another example, if it is not known whether the channel condition has changed after the last adjustment CWp, the value of CWp is not changed.

In this implementation, both CW and CWp may refer to the contention window, or both CW and CWp represent the value of the contention window. Where CW represents the value of the contention window and CWp represents the value CWp of the contention window for CAPC =p. Unless otherwise stated, CW and CWp may be synonymously substituted.

Alternatively, the propagation types may include: unicast, ACK/NACK-based multicast (also referred to as multicast option 2 or multicast option 2), NACK-only multicast (also referred to as multicast option 1 or multicast option 1), ACK-only multicast, broadcast.

Alternatively, the enabling information may include: HARQ enabled, HARQ disabled, collision indication enabled, collision indication disabled. For HARQ enablement, the second device transmits the first feedback information (ACK and/or NACK) to the first device, or the first device transmits the first feedback information (ACK and/or NACK) to the second device. For HARQ disabling, the second device does not transmit first feedback information (e.g., ACK and/or NACK) to the first device; or the first device does not transmit the first feedback information (such as ACK and/or NACK) to the second device. For collision indication enablement, the first device can receive a collision indication or the second device can receive a collision indication. For the conflict indication to be disabled, the first device is not able to receive the conflict indication or the second device is not able to receive the conflict indication.

Optionally, the first propagation type is a propagation type associated with the first side line information, which can be further understood as: the first propagation type is indicated by a first SCI of the first side information. The first propagation type may be at least any one of unicast, multicast based on ACK/NACK (also referred to as multicast option 2 or multicast option 2), multicast based on NACK only (also referred to as multicast option 1 or multicast option 1), multicast based on ACK only, and broadcast. Alternatively, the first SCI may be at least any one of a first-order SCI, a second-order SCI, and a MAC CE.

Optionally, the first enabling information is enabling information associated with the first side line information, which can be further understood as: the first enabling information is indicated by the second SCI of the first side information. The first enabling information may be at least any one of HARQ enabling, HARQ disabling, collision indication enabling and collision indication disabling. The second SCI may be at least any one of a first-order SCI, a second-order SCI, and a MAC CE.

Illustratively, as shown in fig. 18A, the first device performs Type1 channel access for transmitting the first side line information.

In fig. 18A, if the first device transmits the first side information (e.g., transmits the first side information in the first COT), it is necessary to first determine a parameter of channel access, and perform LBT according to the parameter of channel access (e.g., including a value CWp of a contention window, etc.) to access the channel. After accessing the channel, the first device may transmit sidestream information (including the first sidestream information, i.e., the first sidestream information) within the initialized first COT. The propagation type of the first side line information is the first propagation type, and/or the enabling information of the first side line information is the first enabling information. The first device may determine parameters of channel access based on the first propagation type and/or the first enabling information.

In some embodiments, the first sidestream information is first sidestream information sent on a channel after accessing the channel.

Optionally, the first side line information satisfies at least any one of the following: the first side information is a transmission on a time slot where the first device accesses the channel, and/or the first side information is a transmission on a first time slot after the first device accesses the channel, and/or the first side information is a transmission on a second time slot after the first device accesses the channel.

Optionally, the first sidestream information is transmitted within the first COT, the first sidestream information satisfying at least any one of:

The first side information is a transmission on a first time slot of a first COT, and/or the first side information is a transmission on a second time slot of the first COT, and/or the first side information is a first TB sent in the first COT, and/or the first side information is a first HARQ enabled TB in the first COT. In some examples, the first side row information may also be understood as a first TB, both of which may be synonymously replaced.

In some embodiments, there is at least one transmission within the reference duration, the at least one transmission being associated with at least one propagation type; determining parameters of channel access according to a first broadcast type in at least one broadcast type; and/or at least one transmission within the reference duration, the at least one transmission associated with at least one enabling information; and determining parameters of channel access according to first enabling information in the at least one enabling information.

Before the first device determines the channel access parameters (e.g., determines the contention window CWp), there is at least one transmission within the reference duration, which is associated with at least one propagation type and/or enabling information. The determined CWp values for the transmissions of the different propagation types may be the same or different. Similarly, the determined CWp values for the transmission of different enabling information may or may not be the same. Thus, a unified method of determining CWp is needed. The first device determines CWp from the propagation type of the first transmission (i.e., the first side information) of the first COT is a straightforward method. I.e. what the propagation type of the first side information is, it is determined CWp according to this propagation type.

As a possible implementation manner, as shown in fig. 18B, determining the parameter of the channel access according to the first propagation type and/or the first enabling information may be implemented as: s201a, determining first feedback information according to the first propagation type and/or the first enabling information, and S201b, determining parameters of channel access according to the first feedback information. The first feedback information is feedback information associated with second side information in at least one transmission within the reference duration.

In some embodiments, the second side line information and the first side line information satisfy at least any one of:

The second propagation type associated with the second sidestream information is the same as the first propagation type of the first sidestream information;

the second enabling information associated with the second side line information is identical to the first enabling information of the first side line information;

The second source identification ID of the second side line information is the same as the first source ID of the first side line information;

the second destination ID of the second side line information is the same as the first destination ID of the first side line information;

the second HARQ process of the second lateral information is the same as the first HARQ process of the first lateral information;

the first sidestream information is at least any one of retransmission, periodic transmission and periodic transmission of the second sidestream information;

the first side line information is at least any one of retransmission reserved transmission, periodic reserved transmission and periodic reserved retransmission reserved transmission of the second side line information;

The reserved resource indicated by the side line control information of the second side line information transmits the first side line information;

The second sidestream information and the first sidestream information are both transmitted by the first device.

The feedback information may reflect the quality of the channel condition. For example, if the first device receives an ACK, it indicates that the receiving device of the first device may decode the received data, which represents a good channel condition. As another example, if the first device receives a NACK, it is indicated that the receiving device of the first device cannot properly decode the received data, which represents poor channel conditions. For another example, after the last adjustment CWp, the first device does not receive any HARQ information, and the first device cannot determine whether the channel condition is changed, and does not change the value of CWp.

The second side line information associated with the first side line information may be determined according to at least any one of the above conditions. The first feedback information adjustment CWp associated with the second sidestream information is more accurate. And can more reflect whether the current service is easier to access the channel. Collisions with transmissions of other devices in the resource pool can be better avoided.

In other embodiments, the second sidestream information is transmitted within a second COT, the second sidestream information satisfying at least any one of the following: the second side information is a transmission on a first time slot of the second COT, and/or the second side information is a transmission on a second time slot of the second COT, and/or the second side information is a transmission on any time slot of the second COT, and/or the second side information is a first TB sent in the second COT, and/or the second side information is any TB in the second COT, and the second side information is a first HARQ enabled TB in the second COT. In some examples, the second sidestream information may also be understood as a second TB, both of which may be synonymously replaced.

The "second sidestream information is the first TB in the second COT", which can also be understood that the first device adjusts CWp according to the feedback associated with the second sidestream information in the previous COT with the same propagation type. Wherein the previous COT with the same propagation type is the second COT.

Optionally, the first device determines a parameter of channel access according to first feedback information associated with the second sidestream information in the reference duration; or the first device determines the parameters of channel access according to the feedback information associated with the second sidestream information in the reference duration.

For example, the first device transmits at least 1 second sidestream information for a reference duration; and/or the first device receives at least 1 second sidestream information within the reference duration. Accordingly, the first device may receive first feedback information associated with the second sidestream information; and/or the first device may transmit the first feedback information associated with the second sidestream information. And the first equipment determines parameters of channel access according to the first feedback information. Wherein the sidelink information may be PSCCH/PSSCH. The sidelink information may be PSFCH, for example, at least any one of ACK, NACK, collision indication. Wherein the first feedback information may belong to the second time in the time domain. The parameter of the channel access may be, for example, a value CWp of a contention window or a channel access type. The second sidestream information is sent by the first device to the second device, and the first feedback information is sent by the second device to the first device; or the second sidestream information is sent by the second device to the first device, and the first feedback information is sent by the first device to the second device.

Optionally, the reference duration is a period of time after the last adjustment of the channel access parameters and/or the reference duration is a period of time before the channel access parameters are determined in S201. For example, the reference duration may be M time slots. Where M is an integer, e.g., any of m= {1,2,3,4,5 }.

Taking the example of determining the parameters of the channel access according to the first propagation type and the first enabling information, as shown in fig. 19, for example, at least one transmission TB1-TB5 is included in the reference duration, where the propagation type of the TB1, TB4 is the same as the propagation type of the first side line information (both are unicast (one example of the first propagation type)), and the enabling information of the TB1, TB4 is the same as the enabling information of the first side line information (both are HARQ enabling (one example of the first enabling information)), the first device may consider the TB1, TB4 in the reference duration as the second side line information. Feedback information associated with TB1 and TB4 is the first and fourth HARQ (first feedback information) in the second time. The first device may determine parameters of channel access (such as a contention window value CWP) according to the first and fourth HARQ in the second time. Wherein, TB5 is unicast and HARQ is disabled (not consistent with the enabling information of the first side line information), the first device does not adjust CWp according to the feedback information associated with TB 5. TB2 is multicast opt1 and HARQ is enabled, the first device does not adjust CWp according to feedback information associated with TB 2. TB3 is multicast opt2 and HARQ is enabled, the first device does not adjust CWp according to feedback information associated with TB 3.

Still further exemplary, the reference duration includes at least one transmission TB1-TB5, wherein the destination identification of TB1 is the same as the destination identification of the first side line information and the source identification of TB1 is the same as the source identification of the first side line information, and the first device may consider TB1 within the reference duration as the second side line information. The feedback information associated with TB1 is first feedback information. The first device may determine parameters of channel access according to the first feedback information.

Still further exemplary, the second side row information is TB1 for the reference duration, wherein the second destination ID of the second side row information is the same as the first destination ID of the first side row information, and the first device adjusts CWp based on the feedback information associated with TB 1. The fifth destination ID of the fifth sidestream information carried by the TB5 for the reference duration is different from the first destination ID of the first sidestream information, and the first device does not adjust CWp according to the feedback information associated with the TB 5.

Alternatively, the feedback information may be at least any one of ACK, NACK, and collision indication. The first feedback information may be at least any one of ACK, NACK, collision indication.

Optionally, the second sidestream information within the reference duration is sent for the first device, and the first device determines CWp according to the received first feedback information. For example, CWp is determined from the first feedback information received during the second time. The first feedback information is feedback information related to the second sidestream information. Wherein the second sidestream information may be one or more. Accordingly, the first feedback information associated with the second sidestream information may be one or more. Optionally, the first sidestream information is sidestream data information and/or sidestream control information sent by the first device, and the first device determines CWp according to the received first feedback information.

Optionally, the second sidestream information within the reference duration is received by the first device, and the first device determines CWp from the transmitted feedback information. For example, CWp is determined from the first feedback information sent during the second time. The feedback information is feedback information related to the second side line information. Wherein the second sidestream information may be one or more. Accordingly, the first feedback information may be one or more. Optionally, the first side line information is side line feedback information sent by the first device, and the first device determines CWp according to the sent first feedback information.

Alternatively, the feedback information may be replaced by "feedback information", such as, but not limited to, a proportion of the feedback information. The first device may determine CWp based on the proportion of feedback information. Wherein the feedback information belongs to a second duration in the time domain.

Alternatively, the first feedback information may be replaced by "first feedback information", for example, but not limited to, a proportion of the first feedback information. The first device may determine CWp based on a proportion of the first feedback information. Wherein the first feedback information belongs to the second duration in the time domain.

Optionally, the second propagation type is a propagation type associated with the second sidestream information, which can be further understood as: the second propagation type may be indicated by the SCI of the second sidestream information. The second propagation type may be at least any one of unicast, ACK/NACK-based multicast (also referred to as multicast option 2 or multicast opt 2), NACK-only multicast (also referred to as multicast option 1 or multicast opt 1), ACK-only multicast, and broadcast. Alternatively, the SCI of the second side line information may be at least any one of a first-order SCI, a second-order SCI, and a MAC CE.

In some embodiments, the reference duration is determined from the second COT, the second CAPC for initiating the second COT being greater than or equal to the first CPAC, wherein the first CAPC is CAPC associated with the first side information. Wherein the value of the first CAPC is p. The first device may determine CWp that the first CAPC is associated with. The first device may initiate a first COT according to the first CAPC, the first COT bearing the first side-information.

CAPC relates to the difficulty level of channel access, e.g. CAPC is small, and the channel is easier to access; CAPC is large, it is difficult to access the channel. Or CAPC has a small value, the channel can be accessed in a short time; CAPC is large, a long time is required to access the channel. Based on the same CAPC initial COT as the first side information, it is better able to reflect whether the current CAPC is easier to access the channel or not, and CWp adjustment is more accurate. Collisions with transmissions of other devices in the resource pool can be better avoided.

Wherein the second CAPC is CAPC of the second sidestream information association. The value of the second CAPC is p. The second CAPC may be indicated by side control information of the second side communication, or may be indicated by COT indication information of the second COT. For example, the first device may initiate a second COT according to the second CAPC, the second COT carrying second sidestream information. For another example, the first device may share a second COT that the other device initiates according to the second CAPC, the second COT carrying the second sidestream information. For another example, the first device may share a second COT that is initially second-side information with the other devices.

Or alternatively, the time domain in which the second COT is located belongs to a reference duration (e.g., the duration of the second COT is less than the reference duration); or the reference duration belongs to the time domain where the second COT is located; or all or part of the time domain of the second COT belongs to the reference duration.

Optionally, the first side-line control information of the first side-line information indicates the first CAPC.

Alternatively, the second side row control information of the second side row information may indicate the second CAPC, or the COT indication information of the second COT indicates the second CAPC, or the COT sharing information of the second COT indicates the second CAPC.

For example, as shown in fig. 20, if CAPC =2 of the initial first COT, then the second COT initialized with CAPC =2 belongs to the reference duration, and the first device may adjust CWp according to the first feedback information associated with the second sidestream information in the second COT.

Optionally, the second CAPC may also be smaller than the first CAPC.

S202, transmitting first side line information on a channel.

Alternatively, step S202 may be performed by the first device.

It can be understood that the channel access parameters determined in S201 are used to access the channel.

It will be appreciated that the first device transmits the first side information to the second device, and accordingly the second device receives the first side information.

It will be appreciated that when LBT is successful, the first device successfully accesses the channel and transmits the first side information on the channel. When LBT fails, the first device fails to access and does not transmit the first side information.

The embodiment of the application also provides a communication method, when a plurality of pieces of second sidestream information exist, the parameters finally used for accessing the channel are determined according to the respective adjustment results of the pieces of second sidestream information.

In some examples, CWp determined by the first feedback information associated with the plurality of second sidestream information is different; for example, the plurality of second sidestream information includes third sidestream information, fourth sidestream information; the method includes steps S701 and S702, wherein, as in fig. 21, the first device performs S701a or S701b or S701c in S701 according to a difference in conditions:

And S701a, adjusting the value of the contention window to be the minimum value according to the adjusting result corresponding to the third side line information, keeping the value of the contention window according to the adjusting result corresponding to the fourth side line information, and determining to adjust the value of the contention window to be the minimum value.

Illustratively, the third side line information is, for example, first second side line information for a reference duration, and the fourth side line information is, for example, second side line information for the reference duration.

And S701b, adjusting the value of the competition window to be the minimum value according to the adjusting result corresponding to the third side line information, and increasing the value of the competition window to be a larger candidate value according to the adjusting result corresponding to the fourth side line information, so as to determine to adjust the value of the competition window to be the minimum value.

And S701c, the adjustment result corresponding to the third side line information is to keep the value of the competition window, the adjustment result corresponding to the fourth side line information is to increase the value of the competition window to a larger candidate value, and the value of the kept competition window is determined.

Optionally, S200, determining the first propagation type and/or the first enabling information may be further included before S701.

Here, adjusting the value of the contention window to the minimum value can also be understood as letting CWp =cw _min,p for each CAPC =p (p e {1,2,3,4 }). Maintaining the value of the contention window may be understood as maintaining CWp (i.e., not adjusting CWp) for each CAPC =p (p e {1,2,3,4 }). Increasing the value of the contention window to a larger candidate may also be understood as increasing CWp to the next larger candidate for each CAPC =p (p e {1,2,3,4 }).

In other words, the result of determining CWp from the feedback information (e.g., the first feedback information) associated with at least any one of the second side row information is any one of the following updated CWp results:

Adjustment result 1: for each CAPC =p (p e {1,2,3,4 }), CWp =cw _min,p.CW_min,p is made the minimum.

Adjustment result 2: for each CAPC =p (p e {1,2,3,4 }), CWp is maintained (i.e., CWp is not adjusted).

Adjustment result 3: for each CAPC =p (p e {1,2,3,4 }), CWp is added to the next larger candidate.

Optionally, the priority order of the adjustment results is adjustment result 1, adjustment result 2, and adjustment result 3. For example, if the result of the feedback information determination CWp associated with the third side line information is an adjustment result 1, and the result of the feedback information determination CWp associated with the fourth side line information is an adjustment result 2, the first device determines CWp according to the adjustment result 1. For another example, if the result of the feedback information determination CWp associated with the third side line information is the adjustment result 1, and the result of the feedback information determination CWp associated with the fourth side line information is the adjustment result 3, the first device determines CWp according to the adjustment result 1. For another example, if the result of the feedback information determination CWp associated with the third side line information is the adjustment result 2, and the result of the feedback information determination CWp associated with the fourth side line information is the adjustment result 3, the first device determines CWp according to the adjustment result 2.

Optionally, the order of the adjustment results is adjustment result 3, adjustment result 2, adjustment result 1. For example, if the result of the feedback information determination CWp associated with the third side line information is the adjustment result 1, the result of the feedback information determination CWp associated with the fourth side line information is the adjustment result 2, the first device determines CWp according to the adjustment result 2. For another example, if the result of the feedback information determination CWp associated with the third side line information is the adjustment result 1, the result of the feedback information determination CWp associated with the fourth side line information is the adjustment result 3, the first device determines CWp according to the adjustment result 3. For another example, if the result of the feedback information determination CWp associated with the third side line information is the adjustment result 2, the result of the feedback information determination CWp associated with the fourth side line information is the adjustment result 3, the first device determines CWp according to the adjustment result 3.

Alternatively, the adjustment result may also be referred to as an update result.

Optionally, there are a plurality of second side line information within the reference duration, and CWp determined by the first feedback information associated with the plurality of second side line information is different. The first device determines CWp from the first feedback information associated with the last second side row information in the reference duration, or determines CWp from the first feedback information last in time during the second time, or determines CWp from the first feedback information associated with the foremost second side row information during the reference duration, or determines CWp from the first feedback information first in time during the second time. Wherein the first feedback information last in time in the second time may be one or more, and the first feedback information first in time in the second time may be one or more.

S702, the access channel is successful, and the first side information is transmitted.

Alternatively, step S702 may be performed by the first device. It can be understood that the channel access parameters determined in S701a or S701b or S701c in S701 are used to access a channel.

The embodiment of the application also provides a communication method, as shown in fig. 22, which comprises the following steps:

And S601, when the following third condition is met, determining the channel access parameters according to the values configured to the first equipment by the network equipment, or determining the channel access parameters according to the values pre-configured to the first equipment, or determining the channel access parameters according to the pre-defined values, or not adjusting the channel access parameters.

Optionally, S200, determining the first propagation type and/or the first enabling information may be further included before S601.

Alternatively, step S601 may be performed by the first device.

The third condition includes at least one of the following conditions: no sidestream information is detected for the reference duration; no second sidestream information is detected for the reference duration; the first feedback information is not detected in the second time; the first feedback information is not sent in the second time; the propagation type of the sidestream information within the reference duration is not the first propagation type; the enabling information of the side line information within the reference duration is not the first enabling information; the first feedback information in the second time is not the feedback information corresponding to the transmission of the first propagation type; the first feedback information in the second time is not the feedback information corresponding to the transmission of the first enabling information; no transmission of the first propagation type after the last update CWp; and/or there is no transmission of the first enabling information after the last update CWp; and/or, there is no feedback information transmission corresponding to the transmission of the first propagation type.

No information is detected, and it is also understood that no corresponding information is received, or that the corresponding information is not successfully decoded.

Optionally, the configured, preconfigured or predefined values comprise some or all of the values in table 8, table 9 below.

Table 8type 1 channel access related parameter values-example 1

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Table 9type 1 channel access related parameter values-example 2

S602, the access channel is successful, and the first side information is transmitted.

Alternatively, step S602 may be performed by the first device.

It can be understood that the channel access parameters determined in S601 are used to access the channel.

The embodiment of the application also provides a communication method, when a plurality of second sidestream information exists, the method determines CWp according to the propagation types of the second sidestream information and/or the priority of the enabling information.

Optionally, the first propagation type has the highest priority. That is, the propagation type associated with the second sidestream information is the same as the first propagation type associated with the first sidestream information, and CWp is determined from the first propagation type; or preferentially determined CWp according to the first propagation type. The highest priority of the first propagation type may also be understood as determining CWp based on the first feedback information of the second sidestream information, the propagation type of which is the first propagation type.

Optionally, the priority of the first enabling information is highest. That is, the enabling information associated with the second side line information is the same as the first enabling information associated with the first side line information, and CWp is determined according to the first enabling information; or preferably in accordance with the first enabling information CWp. The highest priority of the first enabling information may also be understood as determining CWp according to the first feedback information, where the enabling information is the second side information of the first enabling information.

Optionally, the ACK/NACK based multicast determination CWp is prioritized over the unicast determination CWp; and/or prioritizing CWp the multicast based on the unicast determination CWp over the NACK-only multicast; and/or, prioritizing CWp over side-row information disabled according to feedback according to unicast determination CWp; and/or, determining CWp a priority over determining CWp a side row information that is disabled according to feedback according to a multicast based on NACK only. Determining CWp from the ACK/NACK-based multicast may also be understood as determining CWp from the first feedback information of the second side row information of the ACK/NACK-based multicast. It is further understood that determining CWp is based on the first feedback information based on the unicast-based second side row information based on the unicast-based determination CWp. Determining CWp from NACK-only multicast can also be understood as determining CWp from the first feedback information of the second side row information of NACK-only multicast.

Alternatively, any of the methods of the embodiments of the present embodiments may be used in combination or independently. Taking the method of the first embodiment and the second embodiment as an example, S101 and S102 shown in fig. 4 may be performed after S301 to S303 shown in fig. 9D are performed, that is, the method of the second embodiment is first used to access a channel, and then the method of the first embodiment is used to initialize a first COT and share resources in the first COT. Taking the method corresponding to the third embodiment and the first embodiment as an example, the first device may perform S401 and S402 shown in fig. 14 to send S-SSB, and the first device may perform S102 shown in fig. 4 to share the resources in the first COT with other devices. As another example, at least one of steps S601, S602 may be implemented in combination with the steps of other embodiments. For example, at least one of steps S601, S602 may be combined with S201 and/or S401, etc. Or S601 and S602 may be implemented separately. Combinations of any of the methods of the embodiments are not limited thereto, and various combinations of methods are within the scope of the embodiments of the application.

In embodiments of the present application, pre-configuration or (pre) configuration may refer to one or more of pre-defined, RRC configuration, DCI indication, SCI indication.

Alternatively, in any of the above schemes or schemes formed in combination with each other, the initial device (e.g., device 1, 2) may be a Multi-contiguous slot transmission (Multi-consecutive slots transmission, MCSt) or a non-contiguous slot transmission; or the time slot of the initial device for self transmission is one or more; or the number of frequency domain resources used by the original device per slot may be the same or different from the location.

Optionally, the embodiment of the application does not limit the bearing mode of the message and the signaling.

The above embodiments may be combined and the combined solution may be implemented. Optionally, some operations in the flow of method embodiments are optionally combined, and/or the order of some operations is optionally changed. The order of execution of the steps in each flow is merely exemplary, and is not limited to the order of execution of the steps, and other orders of execution may be used between the steps. And is not intended to suggest that the order of execution is the only order in which the operations may be performed. One of ordinary skill in the art will recognize a variety of ways to reorder the operations herein. In addition, it should be noted that details of processes involved in a certain embodiment herein are equally applicable to other embodiments in a similar manner, or may be used in combination between different embodiments.

Moreover, some steps in method embodiments may be equivalently replaced with other possible steps. Or some steps in method embodiments may be optional and may be deleted in some usage scenarios. Or other possible steps may be added to the method embodiments.

Moreover, the method embodiments described above may be implemented alone or in combination.

It will be appreciated that, in order to implement the above-mentioned functions, the device in the embodiment of the present application includes corresponding hardware structures and/or software modules for performing the respective functions. The various illustrative units and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or a combination of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Those skilled in the art may implement the described functionality using different approaches for each particular application, but such implementation is not to be considered as beyond the scope of the embodiments of the present application.

The embodiment of the application can divide the functional units of the communication device according to the method example, for example, each functional unit can be divided corresponding to each function, or two or more functions can be integrated in one processing unit. The integrated units may be implemented in hardware or in software functional units. It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice.

Further embodiments of the application provide an apparatus which may be the first device or the second device or the third device or a corresponding component as described above. The apparatus may include: a memory and one or more processors. The memory is coupled to the processor. The memory is for storing computer program code, the computer program code comprising computer instructions. When the processor executes the computer instructions, the device may perform the functions or steps performed by the first device or the second device or the third device in the above-described method embodiments. The structure of the device may refer to the structure of the device shown in fig. 2A.

The core structure of the device may be represented as the structure shown in fig. 23, where the device includes: processing module 1301, storage module 1303.

Processing module 1301 may include at least one of a Central Processing Unit (CPU), an application processor (Application Processor, AP), or a communication processor (Communication Processor, CP). Processing module 1301 may perform operations or data processing related to control and/or communication of at least one of the other elements of the user communication apparatus.

The storage module 1303 may include volatile memory and/or nonvolatile memory. The memory module is used for storing at least one relevant instruction or data in other modules of the device.

Optionally, a communication module 1305 is also included for supporting the device to communicate with other devices (via a communication network). For example, the communication module may be connected to a network via wireless communication or wired communication to communicate with other devices. The wireless communication may employ at least one of cellular communication protocols, such as Long Term Evolution (LTE), long term evolution-advanced (LTE-a), code Division Multiple Access (CDMA), wideband Code Division Multiple Access (WCDMA), universal Mobile Telecommunications System (UMTS), wireless broadband (WiBro), or global system for mobile communications (GSM). The wireless communication may include, for example, short-range communication. The short-range communication may include at least one of wireless fidelity (Wi-Fi), bluetooth, near Field Communication (NFC), magnetic Stripe Transmission (MST), or GNSS.

Embodiments of the present application also provide a chip system including at least one processor 1401 and at least one interface circuit 1402, as shown in fig. 24. The processor 1401 and the interface circuit 1402 may be interconnected by wires. For example, interface circuit 1402 may be used to receive signals from other devices (e.g., a memory of a communication apparatus). For another example, interface circuit 1402 may be used to send signals to other devices (e.g., processor 1401). Illustratively, the interface circuit 1402 may read instructions stored in the memory and send the instructions to the processor 1401. The instructions, when executed by the processor 1401, may cause the communication device to perform the various steps in the embodiments described above. Of course, the system-on-chip may also include other discrete devices, which are not particularly limited in accordance with embodiments of the present application.

The embodiment of the application also provides a computer storage medium, which comprises computer instructions, when the computer instructions are run on the communication device, the communication device is caused to execute the functions or steps executed by the mobile phone in the embodiment of the method.

The embodiment of the application also provides a computer program product which, when run on a computer, causes the computer to execute the functions or steps executed by the mobile phone in the above method embodiment.

It will be apparent to those skilled in the art from this description that, for convenience and brevity of description, only the above-described division of the functional modules is illustrated, and in practical application, the above-described functional allocation may be performed by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to perform all or part of the functions described above.

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, and the division of modules or units, for example, is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another apparatus, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and the parts displayed as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions for causing a device (may be a single-chip microcomputer, a chip or the like) or a processor (processor) to perform all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read Only Memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely illustrative of specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of communication, said method comprising:

the first device initializes a first channel occupation time COT;

The first device sends first sharing indication information to the second device, wherein the first sharing indication information is used for indicating part or all of frequency domain resources in a first frequency domain resource, and the part or all of frequency domain resources are used for sharing to the second device, and the first frequency domain resource is a frequency domain resource occupied by the first device in the first COT; or the first frequency domain resource is a frequency domain resource included in the first COT.

2. The method of claim 1, wherein the frequency domain resource occupied by the first device within the first COT is a frequency domain resource occupied by the first device in a first time slot within the first COT; or the first equipment occupies the frequency domain resources on the time slot with the least frequency domain resources occupied in the first COT; or the first device occupies the frequency domain resources on the time slot with the largest frequency domain resources occupied in the first COT.

3. The method according to claim 1 or 2, wherein a second frequency domain resource is a frequency domain resource occupied by the first device on a first time slot within the first COT, and a third frequency domain resource is a frequency domain resource occupied by a third device on a first time slot of an initialized second COT, the second frequency domain resource being frequency division multiplexed with the third frequency domain resource.

4. The method of claim 3, wherein the step of,

The fourth frequency domain resource is a frequency domain resource occupied by the first device in the first COT, and the fifth frequency domain resource is a frequency domain resource occupied by the third device in the initialized second COT;

and/or the sixth frequency domain resource further comprises a seventh frequency domain resource, wherein the seventh frequency domain resource is located in the same channel as the fourth frequency domain resource and the fifth frequency domain resource and is different from the fourth frequency domain resource and the fifth frequency domain resource.

5. The method of any one of claims 1-4, further comprising: allowing the second device to transmit using the shared resource when at least one of the following conditions is satisfied:

the first device and the third device both instruct the second device to use shared resources for transmission through shared indication information; or alternatively

Any one of the first device and the third device indicates the second device to use shared resources for transmission through sharing indication information; or alternatively

The first device instructs the second device to use the shared resource for transmission through the shared instruction information.

6. The method according to claim 4 or 5, wherein the first device fulfils at least one first condition of:

7. The method according to any of claims 1-6, wherein the first device instructs the second device to use shared resources for transmission via a sharing indication information, the first device not excluding time-frequency domain resources of the second device in resource selection.

8. The method of any of claims 1-7, wherein sending the first shared indication information to the second device comprises:

The second condition includes at least one of the following conditions:

the target device of the second device comprises the first device.

9. The method according to any of claims 3-8, wherein the first COT comprises a time domain resource that is a first time domain resource, the second COT comprises a time domain resource that is a second time domain resource, a duration of the first time domain resource is longer than a duration of the second time domain resource, and any frequency domain resource on a third time domain resource is sharable by the first device to the second device, wherein the third time domain resource is a resource that is non-overlapping in time domain with the first time domain resource and the second time domain resource.

10. A method of communication, said method comprising:

The second equipment receives first sharing indication information from the first equipment, wherein the first sharing indication information is used for indicating part or all of frequency domain resources in the first frequency domain resources; the first frequency domain resource is a frequency domain resource occupied by the first device in the first COT; or the first frequency domain resource is a frequency domain resource included in the first COT;

the second equipment determines part or all of resources in the first frequency domain resources according to the first sharing indication information;

and the second equipment sends side line information on the part or all of the resources.

11. The method of claim 10, wherein the frequency domain resources occupied by the first device within the first COT are frequency domain resources occupied by the first device in a first time slot within the first COT; or the first equipment occupies the frequency domain resources on the time slot with the least frequency domain resources occupied in the first COT; or the first device occupies the frequency domain resources on the time slot with the largest frequency domain resources occupied in the first COT.

12. The method according to claim 10 or 11, wherein a second frequency domain resource is a frequency domain resource occupied by the first device on a first time slot within the first COT, and a third frequency domain resource is a frequency domain resource occupied by a third device on a first time slot of an initialized second COT, the second frequency domain resource being frequency division multiplexed with the third frequency domain resource.

13. The method according to claim 12, wherein the method further comprises:

14. The method of claim 13, wherein the fourth frequency domain resource and the fifth frequency domain resource are included in a sixth frequency domain resource; the sixth frequency domain resource is used for transmission by the second device; and/or the sixth frequency domain resource further comprises a seventh frequency domain resource, wherein the seventh frequency domain resource is located in the same channel as the fourth frequency domain resource and the fifth frequency domain resource and is different from the fourth frequency domain resource and the fifth frequency domain resource.

15. The method according to any of claims 10-14, wherein the second device is allowed to transmit using shared resources when at least one of the following conditions is met:

receiving sharing indication information from the first device and the third device, wherein the sharing indication information is used for indicating the second device to use shared resources for transmission;

sharing indication information is received from the first device.

16. The method according to claim 14 or 15, wherein the first device fulfils at least one first condition of:

17. A method of communication, for use with a first device, said method comprising:

And transmitting the first side line information on the channel.

18. The method of claim 17, wherein the step of determining the position of the probe is performed,

At least one transmission within a reference duration, the at least one transmission being associated with at least one propagation type; determining parameters of channel access according to a first broadcast type in at least one broadcast type; and/or at least one transmission within the reference duration, the at least one transmission associated with at least one enabling information; and determining parameters of channel access according to first enabling information in the at least one enabling information.

19. The method according to claim 17 or 18, characterized in that the parameters of the channel access comprise a contention window value CWp or a listen before talk, LBT, type.

20. The method according to any of claims 17-19, wherein the first sidestream information is first sidestream information transmitted on the channel after accessing the channel.

21. The method according to any of claims 17-20, wherein determining parameters of channel access based on a first propagation type and/or the first enabling information comprises:

determining parameters of the channel access according to the first feedback information, wherein the first feedback information is feedback information associated with second side information in at least one transmission within a reference duration, and the second side information and the first side information meet at least any one of the following:

the second sidestream information is transmitted by the first device;

the propagation type of the second side line information is the same as that of the first side line information;

the enabling information of the second side line information is the same as the enabling information of the first side line information;

The second destination ID of the second side line information is the same as the first destination ID of the first side line information.

22. The method of claim 21, wherein the second side line information is a plurality of pieces, and the plurality of pieces of second side line information includes third side line information and fourth side line information; the method further comprises the steps of:

23. The method of claim 21 or 22, wherein the reference duration is determined according to a second channel occupancy time, COT, and wherein a channel access priority CAPC for initializing the second COT is greater than or equal to a first CAPC, wherein the first CAPC is CAPC associated with the first side line information.

24. The method according to any one of claims 17-23, further comprising: when the following third condition is met, determining the channel access parameter according to the value configured to the first device by the network device, or determining the channel access parameter according to the value pre-configured to the first device, or determining the channel access parameter according to a pre-defined value, or not adjusting the channel access parameter;

25. A communication device comprising a memory and one or more processors; the memory is coupled to the processor; the memory is for storing computer program code comprising computer instructions which, when executed by the processor, cause the one or more processors to perform the method of any of claims 1-24.

26. A computer readable storage medium having instructions stored therein, which when run on a terminal, cause the terminal to perform the method of any of claims 1-24.

27. A communication device, comprising:

A processor for executing a computer program stored in a memory to cause the apparatus to perform the method of any one of claims 1 to 24.

28. The apparatus of claim 27, further comprising the memory and/or a communication interface coupled to the processor,

The communication interface is used for inputting and/or outputting information.

29. A computer program product, characterized in that the computer program product comprises instructions for performing the method of any one of claims 1 to 24.