CN118301749A

CN118301749A - Communication method and device

Info

Publication number: CN118301749A
Application number: CN202310113825.3A
Authority: CN
Inventors: 刘云
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2023-01-03
Filing date: 2023-01-30
Publication date: 2024-07-05
Also published as: WO2024146423A1

Abstract

The application relates to a communication method and a communication device. And transmitting side line information in a first time domain unit at a first subcarrier interval, wherein if a second time domain unit is a time domain unit occupied by a side line synchronizing signal, at least two sub-time domain units are spaced between a transmission end position of the side line information in the first time domain unit and a transmission start position of the side line synchronizing signal in the second time domain unit, and the second time domain unit is the next time domain unit of the first time domain unit. Even if the subcarrier interval is 60kHz, the time length of at least two time-domain units can meet the time requirement of a sending end of the SL synchronous signal on a monitoring channel, so that the SL synchronous signal can be sent, and the sending success rate of the SL synchronous signal is improved.

Description

Communication method and device

Cross Reference to Related Applications

The present application claims priority from the chinese patent application filed on day 03 of year 2023, 01, filed on the national intellectual property office under application number 202310002171.7, entitled "a channel access method and apparatus", the entire contents of which are incorporated herein by reference.

Technical Field

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

Background

Please refer to fig. 1A and 1B, which are two slot (slot) structures for transmitting Side Link (SL) data. Fig. 1A differs from fig. 1B in that the time slot shown in fig. 1B includes a physical side feedback channel (PHYSICAL SIDELINK feedback channel, PSFCH). It can be seen that the last orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbol (symbol) of both slot structures is a GAP (GAP) and can be used for transmit-receive conversion.

Referring again to fig. 1C, the slot structure of the SL synchronization signal is shown. In the slot, the 1 st OFDM symbol, and the 6 th to 13 th OFDM symbols are used to transmit a physical sidelink broadcast channel (PHYSICAL SIDELINK broadcast channel, PSBCH); the 2 nd and 3rd OFDM symbols are used for transmitting side row primary synchronization signals (SIDELINK PRIMARY synchronization signal, S-PSS); the 4 th and 5 th OFDM symbols are used for transmitting side row secondary synchronization signals (sidelink secondary synchronization signal, S-SSS). Wherein the SL synchronization signal (alternatively referred to as a SL synchronization signal block) may comprise PSBCH, S-PSS, and S-SSS. For SL synchronization signals, it is currently required to listen to the channel at least 25 mus before starting to transmit PSBCH.

SL-unlicensed (unlicensed, U) is the subject of current discussion, the main content of SL-U is to perform SL transmission in unlicensed spectrum. The SL-U introduces a subcarrier spacing of 60kHz in addition to the existing 15kHz and 30kHz subcarrier spacing. At a subcarrier spacing of 60kHz, the length of one OFDM symbol is approximately 17.85 mus. As can be seen from fig. 1A or fig. 1B, there is only one GAP at the end of one time slot, and if the SL synchronization signal is transmitted in the next time slot after the data transmission is completed, the time of the one GAP is insufficient for the transmitting end of the SL synchronization signal to complete the channel listening process, which may cause the SL synchronization signal to be unable to be transmitted.

Disclosure of Invention

The embodiment of the application provides a communication method and a communication device, which are used for improving the success rate of transmission of SL synchronous signals.

In a first aspect, a first communication method is provided, which may be performed by a terminal device, or by another device comprising the functionality of the terminal device, or by a chip system (or chip) or other functional module, which is capable of implementing the functionality of the terminal device, the chip system or functional module being provided in the terminal device, for example. The terminal device is for example referred to as a first terminal device. The method comprises the following steps: and transmitting side line information in a first time domain unit at a first subcarrier interval, wherein if a second time domain unit is a time domain unit occupied by a side line synchronizing signal, at least two sub-time domain units are spaced between a transmission end position of the side line information in the first time domain unit and a transmission start position of the side line synchronizing signal in the second time domain unit, and the second time domain unit is the next time domain unit of the first time domain unit.

In the embodiment of the present application, if the second time domain unit is a time domain unit occupied by the SL synchronization signal and the first time domain unit is a time domain unit preceding the second time domain unit, then at least two sub-time domain units are spaced between the transmission end position of the SL information in the first time domain unit and the transmission start position of the SL synchronization signal in the second time domain unit. For example, the SL synchronization signal occupies a first sub-time domain unit in the second time domain unit, and then the transmission end position of the SL information in the first time domain unit is spaced from the first sub-time domain unit by at least two sub-time domain units. For example, the sub-field unit is an OFDM symbol, it can be understood that at least two OFDM symbols may be used as GAPs at the end of the first time field unit, and even if the subcarrier interval is 60kHz, the duration of at least two OFDM symbols can meet the time requirement that the transmitting end of the SL synchronization signal listens to the channel, thereby enabling the SL synchronization signal to be transmitted and improving the transmission success rate of the SL synchronization signal.

In an alternative embodiment, at least two last sub-time domain units of the first time domain unit do not transmit SL information, or the at least two last sub-time domain units of the first time domain unit are idle, or the at least two last sub-time domain units of the first time domain unit are GAPs. This enables to space the SL information in the first time domain unit by at least two sub-time domain units between the transmission end position in the first time domain unit and the transmission start position of the SL synchronization signal in the second time domain unit.

In an alternative embodiment, the second time domain unit is located in a resource pool of the first terminal device; or, the second time domain unit is located outside the resource pool of the first terminal equipment; or the second time domain unit is located outside the resource pool of the first terminal device, and the second time domain unit is the first time domain unit used for sending the sidestream synchronous signal in one sending period of the sidestream synchronous signal, or is any time domain unit used for sending the sidestream synchronous signal in one sending period of the sidestream synchronous signal. The resources for the transmission side line synchronization signal may include periodic resources and additional resources, the periodic resources may be located outside of the resource pool, and the additional resources may be located within the resource pool. The resource pool is, for example, a SL resource pool allocated to the first terminal device.

It may be provided that if the second time domain unit is located outside the resource pool, it indicates that the probability of using the second time domain resource to transmit the side line synchronization signal is relatively high, so that the time slot structure of the first time domain unit may be changed, and at least two sub time domain units may be spaced between the transmission end position of the SL information in the first time domain unit and the transmission start position of the SL synchronization signal in the second time domain unit; if the second time domain unit is located in the resource pool, which indicates that the probability of using the second time domain resource to transmit the side line synchronization signal is smaller, this may not be necessary, for example, the transmission end position of the SL information in the first time domain unit may be separated from the transmission start position of the SL synchronization signal in the second time domain unit by one or more sub-domain units.

Or the location of the second time domain unit is not limited, and the second time domain unit may be located in the resource pool or may be located outside the resource pool. Optionally, if the second time domain unit is located outside the resource pool, it indicates that the second time domain unit is a periodic resource for transmitting the side line synchronization signal. The one or more resources may be included in one transmission period to transmit the SL synchronization signal, and then the second time domain unit may be the first time domain unit in one transmission period to transmit the SL synchronization signal, or may be any time domain unit in one transmission period to transmit the SL synchronization signal, which is not limited.

In an optional implementation manner, the second time domain unit is any time domain unit used for transmitting the side line synchronization signal in one transmission period of the side line synchronization signal, and includes: the second time domain unit is any one of time domain units of which the part in one transmission period of the side line synchronization signal is used for transmitting the side line synchronization signal. The plurality of time domain units may be, for example, the first N time domain units in one transmission period, or may be any N time domain units in one transmission period, where N is a positive integer, and the N time domain units may be part or all of the time domain units used for transmitting the SL synchronization signal in one transmission period.

In an alternative embodiment, the time domain unit is a slot and the sub-domain unit is an OFDM symbol.

In an alternative embodiment, the first subcarrier spacing is 60kHz or 120kHz, or may be a subcarrier spacing of greater value.

In a second aspect, a second communication method is provided, which may be performed by a terminal device, or by another device comprising the functionality of the terminal device, or by a chip system (or chip) or other functional module capable of implementing the functionality of the terminal device, the chip system or functional module being for example provided in the terminal device. The terminal device is for example referred to as a first terminal device. The method comprises the following steps: and under the first subcarrier interval, if the second time domain unit is a time domain unit occupied by the sidestream synchronous signal, when determining resources for transmitting sidestream information or when transmitting sidestream information, not occupying the first time domain unit, wherein the second time domain unit is the next time domain unit of the first time domain unit.

The embodiment of the application can lead the first terminal equipment not to occupy the time domain unit before the SL synchronous signal, so that the transmitting end of the SL synchronous signal has enough time to monitor the channel before transmitting the SL synchronous signal, thereby improving the success rate of transmitting the SL synchronous signal.

In an alternative embodiment, the second time domain unit is located in a resource pool of the first terminal device; or, the second time domain unit is located outside the resource pool of the first terminal equipment; or the second time domain unit is located outside the resource pool of the first terminal device, and the second time domain unit is the first time domain unit used for sending the sidestream synchronous signal in one sending period of the sidestream synchronous signal, or is any time domain unit used for sending the sidestream synchronous signal in one sending period of the sidestream synchronous signal.

In an optional implementation manner, the second time domain unit is any time domain unit used for transmitting the side line synchronization signal in one transmission period of the side line synchronization signal, and includes: the second time domain unit is any one of time domain units of which the part in one transmission period of the side line synchronization signal is used for transmitting the side line synchronization signal.

With regard to the technical effects brought about by the various alternative embodiments of the second aspect, reference may be made to the description of the technical effects of the corresponding embodiments of the first aspect.

In a third aspect, a third communication method is provided, which may be performed by a terminal device, or by another device comprising the functionality of the terminal device, or by a chip system (or chip) or other functional module capable of implementing the functionality of the terminal device, the chip system or functional module being for example provided in the terminal device. The terminal device is for example referred to as a second terminal device. The method comprises the following steps: and transmitting a side line synchronization signal at a first subcarrier interval, wherein time domain resources for transmitting the side line synchronization signal comprise at least two continuous time domain units, a first time domain unit in the at least two continuous time domain units is idle, and a second time domain unit in the at least two continuous time domain units is used for bearing the side line synchronization signal.

The embodiment of the application can increase the number of the time domain units allocated to the SL synchronous signals, and can ensure that the first terminal equipment does not occupy the first time domain unit allocated to the SL synchronous signals, so that the first terminal equipment has enough time to monitor the channel before transmitting the SL synchronous signals, thereby improving the success rate of transmitting the SL synchronous signals.

In a fourth aspect, a fourth communication method is provided, which may be performed by a terminal device, or by another device comprising the functionality of the terminal device, or by a chip system (or chip) or other functional module capable of implementing the functionality of the terminal device, the chip system or functional module being for example provided in the terminal device. This terminal device is for example referred to as a third terminal device. The method comprises the following steps: and transmitting or receiving the sidestream information at a first subcarrier interval, wherein the third terminal device does not transmit or detect the sidestream synchronization signal on a periodic resource used for transmitting the sidestream synchronization signal. The side line information does not occupy a first time domain unit, wherein the first time domain unit is a time domain unit before a second time domain unit, and the second time domain unit is an additional resource for transmitting the side line synchronization signal; or the sidestream information is transmitted in a first time domain unit, the sidestream information is separated by at least two sub-time domain units between the transmission end position of the first time domain unit and the transmission start position of a sidestream synchronous signal in a second time domain unit, the first time domain unit is the previous time domain unit of the second time domain unit, and the second time domain unit is an additional resource for transmitting the sidestream synchronous signal; or the sidestream information is transmitted in a second time domain unit, wherein the time duration within 16 mu s before the second time domain unit is unoccupied, the second time domain unit is an additional resource for transmitting the sidestream synchronization signal, and the sidestream information comprises a first sidestream synchronization signal.

If the third terminal device does not detect or send the SL synchronization signal on the periodic resource, the third terminal device is likely to detect or send the SL synchronization signal on the additional resource, so that the previous time domain unit of the additional resource may not be occupied, or at least two sub time domain units may be spaced between the transmission of the previous time domain unit of the additional resource and the time domain position occupied by the SL synchronization signal on the additional resource, or the third terminal device may access the second time domain unit in a Type 2B manner, where the sending end of the SL synchronization signal (e.g. the third terminal device or other terminal device) has enough time to monitor the channel before the additional resource starts, so that the SL synchronization signal can be sent, thereby improving the sending success rate of the SL synchronization signal.

In an alternative embodiment, the sidelink information is transmitted in a first time domain unit, at least two last sub-time domain units of the first time domain unit do not transmit the sidelink information, or at least two last sub-time domain units of the first time domain unit are idle, or at least two last sub-time domain units of the first time domain unit are GAPs. This enables to space the SL information in the first time domain unit by at least two sub-time domain units between the transmission end position in the first time domain unit and the transmission start position of the SL synchronization signal in the second time domain unit.

In a fifth aspect, a fifth communication method is provided, which may be performed by a terminal device, or by another device comprising the functionality of the terminal device, or by a chip system (or chip) or other functional module, which is capable of implementing the functionality of the terminal device, the chip system or functional module being provided in the terminal device, for example. This terminal device is for example referred to as fourth terminal device. The method comprises the following steps: receiving sharing information from a fifth terminal device at a first subcarrier interval, wherein the sharing information comprises first indication information, and the first indication information is used for indicating that first resources in COT are allocated to the fourth terminal device; and determining the bit number of second indication information included in the sharing information according to the number of sub-domain units serving as intervals before the first resource, wherein the second indication information is used for indicating a COT sharing access mode.

In the embodiment of the present application, the second indication information may relate to the number of subzone units serving as GAPs before the first resource, and the terminal device receiving the second indication information may determine the number of bits of the second indication information according to the number of subzone units serving as GAPs before the first resource, so as to improve the decoding success rate of the second indication information. And the bit number of the second indication information is determined in this way, without predefining or pre-configuring the bit number of the second indication information, so that the bit number occupied by the second indication information is more flexible and changeable. In addition, the second indication information does not need to indicate the Type2A, so that the number of bits occupied by the second indication information can be reduced, and the overhead of sharing information is saved.

In an alternative embodiment, if the number of sub-field units located as an interval before the first resource is 1, the number of bits of the second indication information is 1. This can reduce the overhead of the second indication information.

In an optional implementation manner, the number of bits of the second indication information is 1, and the second indication information is used to indicate that the COT shared access mode is Type 2B or Type 2C. The Type 2B is capable of occupying the first resource if the duration within 16 μs before the first resource is unoccupied, otherwise, the first resource cannot be occupied; and the Type 2C is that channel detection is not required to be performed before the first resource performs transmission, if the duration of the first resource is less than or equal to 584 μs, the first resource can be occupied, otherwise, the first resource cannot be occupied. If the number of the subzone units serving as the interval before the first resource is 1, if the COT shared access mode is Type 2A, the GAP before the first resource may not meet the time requirement of the fourth terminal device for monitoring the channel. Therefore, the second indication information does not need to indicate the Type 2A, so that the bit number occupied by the second indication information can be reduced, and the cost of sharing information is saved; and the time requirement of the fourth terminal equipment for monitoring the channel can be met, so that the fourth terminal equipment can access the first resource.

In an alternative embodiment, the first resource is a side feedback channel resource included in a first time domain unit in the COT, and the sub-domain unit as an interval located before the first resource includes a sub-domain unit as an interval located before the side feedback channel resource in the first time domain unit; or, the first resource is a first time domain unit in the COT, and the sub-domain unit as an interval located before the first resource includes the sub-domain unit as an interval located before the first time domain unit in the COT.

In a sixth aspect, a sixth communication method is provided, which may be performed by a terminal device, or by another device comprising the functionality of the terminal device, or by a chip system (or chip) or other functional module, which is capable of implementing the functionality of the terminal device, the chip system or functional module being provided in the terminal device, for example. This terminal device is for example referred to as fifth terminal device. The method comprises the following steps: and sending sharing information to fourth terminal equipment at a first subcarrier interval, wherein first indication information included in the sharing information is used for distributing first resources in COT for the fourth terminal equipment, second indication information included in the sharing information is used for indicating a COT sharing access mode, and the bit number of the second indication information is determined according to the number of sub-domain units serving as intervals before the first resources.

In an alternative embodiment, if the number of sub-field units located as an interval before the first resource is 1, the number of bits of the second indication information is 1.

In an optional implementation manner, the number of bits of the second indication information is 1, and the second indication information is used to indicate that the COT sharing access mode is Type 2B or Type 2C. The Type 2B is capable of occupying the first resource if the duration within 16 μs before the first resource is unoccupied, otherwise, the first resource cannot be occupied; and the Type 2C is that channel detection is not required to be performed before the first resource performs transmission, if the duration of the first resource is less than or equal to 584 μs, the first resource can be occupied, otherwise, the first resource cannot be occupied.

Regarding the technical effects brought about by the sixth aspect or various alternative embodiments, reference may be made to the description of the technical effects of the fifth aspect or corresponding embodiments.

In a seventh aspect, a seventh communication method is provided, which may be performed by a terminal device, or by another device comprising the functionality of the terminal device, or by a chip system (or chip) or other functional module, which is capable of implementing the functionality of the terminal device, the chip system or functional module being provided in the terminal device, for example. This terminal device is for example referred to as fourth terminal device. The method comprises the following steps: receiving sharing information from a fifth terminal device at a first subcarrier interval, wherein the sharing information is used for distributing first resources in COT for the fourth terminal device; and determining to access the first resource by adopting a first COT sharing access mode according to the number of the sub-domain units serving as intervals positioned in front of the first resource.

According to the embodiment of the application, the information for indicating the COT shared access mode does not need to be sent, and the fourth terminal equipment can determine the first COT shared access mode according to the predefined or preconfigured information, so that the transmission overhead can be reduced.

In an alternative embodiment, the first COT shared access mode is a default COT shared access mode, or a COT shared access mode predefined for a protocol. For example, the first COT shared access mode is preconfigured in the terminal device, or is a default (default) mode, or may be a mode predefined by a protocol.

In an optional implementation manner, the first COT shared access mode is Type 2B or Type 2C. And the Type 2B is capable of occupying the first resource if the duration within 16 mu s before the first resource is unoccupied, otherwise, the first resource cannot be occupied. And the Type 2C is that channel detection is not required to be performed before the first resource performs transmission, if the duration of the first resource is less than or equal to 584 μs, the first resource can be occupied, otherwise, the first resource cannot be occupied. The first COT shared access mode may be Type 2B or Type 2C, but not Type 2A, so that the time requirement that the fourth UE listens to the channel before using the first resource can be met, so that the fourth terminal device can use the first resource, the resource utilization rate in the COT is improved, and the probability that the first resource is occupied by other UEs due to the fact that the fourth terminal device cannot be used is reduced.

In an eighth aspect, an eighth communication method is provided, which may be performed by a terminal device, or by another device comprising the functionality of the terminal device, or by a system-on-chip (or chip) or other functional module, which is capable of implementing the functionality of the terminal device, the system-on-chip or functional module being provided in the terminal device, for example. This terminal device is for example referred to as sixth terminal device. The method comprises the following steps: and under the first subcarrier interval, determining the number of the sub-domain units serving as the interval in the first time domain unit according to the COT sharing access mode of the resource positioned behind the first time domain unit. In the embodiment of the application, the terminal equipment using the time domain unit before the resource (called the first resource) located behind the first time domain unit can determine the number of the sub-domain units serving as the intervals in the time domain unit according to the COT sharing access mode of the first resource, so that the time requirement of the terminal equipment using the first resource for monitoring the channel can be met.

In an alternative embodiment, the method further comprises: receiving second sharing information, wherein the second sharing information is used for distributing the first time domain unit in COT to the sixth UE; or, preempting the COT and occupying the first time domain unit. The sixth UE may be a UE that preempts the COT, and the sixth UE may occupy the first time domain unit within the COT; or other UEs may preempt the COT, and the other UEs allocate the first time domain unit to the sixth UE.

In an alternative embodiment, the method further comprises: first shared information is transmitted, which is used to allocate the resources (i.e., first resources) within the COT for the fourth UE. If the COT is preempted by the sixth UE, the sixth UE may allocate resources within the COT for other UEs, e.g., allocate first resources for the fourth UE. Or if the COT is preempted by other UEs, the resources within the COT may be allocated by other UEs.

In an alternative embodiment, determining the number of sub-field units serving as intervals in the first time-field unit according to the COTs shared access mode of the resource located after the first time-field unit includes: the COT sharing access mode is Type2A, and the number of the sub-domain units serving as intervals in the first time domain unit is determined to be more than or equal to 2; or the COT shared access mode is Type 2B or Type 2C, it is determined that the number of sub-field units serving as intervals in the first time field unit is greater than or equal to 1. In this way, the number of sub-field units as intervals within the first time field unit is enabled to meet the time requirement of the fourth UE to listen to the channel before using the first resource. For example, the receiving end of the SL information transmitted on the first time domain unit may determine, according to the COT shared access method of the first resource, the number of sub-domain units serving as the interval in the first time domain unit, thereby determining the sub-domain unit that receives the SL information.

In a ninth aspect, a ninth communication method is provided, which may be performed by a terminal device, or by another device comprising the functionality of the terminal device, or by a chip system (or chip) or other functional module, which is capable of implementing the functionality of the terminal device, the chip system or functional module being provided in the terminal device, for example. This terminal device is for example referred to as fifth terminal device. The method comprises the following steps: and determining COT at the first subcarrier interval, wherein the last time domain unit in the COT does not comprise sidestream feedback channel resources.

According to the embodiment of the application, the last time domain unit does not comprise SL feedback channel resources, so that the last time domain unit can have more symbols for transmitting SL information, and the transmission delay of the SL information can be reduced. The SL information includes, for example, SL data and/or SL control information, etc.

In an alternative embodiment, the sidelink feedback channel resource is a periodic resource. For example, the SL feedback channel resource is PSFCH resources, PSFCH resources may occur periodically.

In a tenth aspect, a tenth communication method is provided, which is executable by a terminal device, or by another device comprising the functions of the terminal device, or by a chip system (or chip) or other functional module capable of implementing the functions of the terminal device, the chip system or functional module being for example provided in the terminal device. This terminal device is for example referred to as fourth terminal device. The method comprises the following steps: receiving sharing information from a fifth terminal device at a first subcarrier interval, wherein the sharing information is used for distributing a first time domain unit in COT to the fourth terminal device, and the first time domain unit comprises sidestream feedback channel resources; and if the first time domain unit is the last time domain unit in the COT, the time domain resource and the frequency domain resource where the sidestream feedback channel resource is positioned are used for transmitting sidestream data, or the sidestream feedback channel resource is not enabled.

By the method provided by the embodiment of the application, the last time domain unit in the COT can have more symbols for transmitting SL information, and the transmission delay of the SL information can be reduced.

In an eleventh aspect, there is provided an eleventh communication method, the method being executable by a terminal device, or by another device comprising the functions of the terminal device, or by a chip system (or chip) or other functional module capable of implementing the functions of the terminal device, the chip system or functional module being for example provided in the terminal device. This terminal device is for example referred to as fifth terminal device. The method comprises the following steps: determining the COT at the first subcarrier spacing; and determining an access point used by the fifth terminal equipment in the occupied first time domain unit according to the number of the time domain units occupied by the fifth terminal equipment in the COT.

For example, if the fifth terminal device occupies only one time domain unit, it can access at the first access point of the time domain unit, thereby being able to increase the amount of available resources of the fifth terminal device. Therefore, the fifth terminal device determines the access point used by the fifth terminal device in the occupied first time domain unit according to the number of the time domain units occupied by the fifth terminal device in the COT, so that the success rate of SL data transmission of the fifth terminal device can be improved.

In an alternative embodiment, determining, according to the number of time domain units occupied by the fifth terminal device in the COT, an access point used by the fifth terminal device in the first occupied time domain unit includes: if the fifth terminal equipment occupies a time domain unit in the COT, the fifth terminal equipment starts to execute transmission at a first access point in the time domain unit; or if the fifth terminal device occupies a plurality of time domain units in the COT, the fifth terminal device starts to perform transmission at a first access point or a second access point in a first time domain unit in the plurality of time domain units. In the case that the fifth terminal device occupies only one time domain unit, if the second access point of the fifth terminal device in the time domain unit starts to perform transmission, the number of remaining symbols in the time domain unit is smaller, i.e. the available resources in the time domain unit are smaller for the fifth terminal device, which may not meet the SL data transmission requirement of the fifth terminal device. In this embodiment of the present application, if the fifth terminal device occupies only one time domain unit, the fifth terminal device may access to the first access point of the time domain unit, thereby increasing the number of available resources of the fifth terminal device and improving the SL data transmission success rate of the fifth terminal device. Or if the fifth terminal device occupies a plurality of time domain units in the COT, it indicates that more resources are available in the COT by the fifth terminal device, so that the fifth terminal device can access at the first access point or the second access point of the first time domain unit, and specifically, the fifth terminal device can realize the access by itself without limitation.

In a twelfth aspect, a twelfth communication method is provided, which may be performed by a terminal device, or by another device including the functions of the terminal device, or by a chip system (or chip) or other functional module capable of implementing the functions of the terminal device, the chip system or functional module being provided in the terminal device, for example. This terminal device is for example referred to as fifth terminal device. The method comprises the following steps: determining the COT at the first subcarrier spacing; and if the upper layer of the fifth terminal equipment indicates that the fifth terminal equipment occupies one time domain unit in the COT to send data and the fifth terminal equipment starts to execute transmission at a second access point in the time domain unit, the fifth terminal equipment executes retransmission of the transmission at the next time domain unit of the time domain unit.

For example, if the fifth terminal device occupies only one time domain unit in the COT, but the fifth terminal device is only accessed by the second access point in the time domain unit, the number of remaining symbols in the time domain unit is smaller. In this embodiment of the present application, if the fifth terminal device occupies only one time domain unit and is accessed at the second access point of the time domain unit, the fifth terminal device may perform retransmission in the next time domain unit of the time domain unit, that is, perform retransmission of SL data in the previous time domain unit in the next time domain unit, thereby increasing the number of available resources of the fifth terminal device and improving the SL data transmission success rate of the fifth terminal device.

In a thirteenth aspect, there is provided a thirteenth communication method, which is executable by a terminal device, or by another device comprising the functions of the terminal device, or by a chip system (or chip) or other functional module capable of implementing the functions of the terminal device, the chip system or functional module being for example provided in the terminal device. The terminal device is for example referred to as a second terminal device. The method comprises the following steps: and transmitting a side line synchronization signal at a first subcarrier interval, wherein the number of resource blocks occupied by the side line synchronization signal is 24, or the number of resource blocks occupied by the side line synchronization signal is greater than or equal to a first value, and the first value is determined according to the number of sub-field units occupied by the side line synchronization signal at the first subcarrier interval and the number of sub-field units occupied by the side line synchronization signal at a second subcarrier interval.

The embodiment of the application expands the frequency domain resources occupied by the SL synchronous signals, so that more resources are used for transmitting the SL synchronous signals, and the success rate of the transmission of the SL synchronous signals can be improved.

In an alternative embodiment, the first subcarrier spacing is 60kHz or 120kHz, or may be a subcarrier spacing of greater value; the second subcarrier spacing is 15kHz or 30kHz.

In an alternative embodiment, the first value satisfies the following relationship: wherein K represents the first value. The manner in which the first value is calculated is given so that a person skilled in the art can implement the solution of the embodiment of the application.

In a fourteenth aspect, a fourteenth communication method is provided, which is executable by a terminal device, or by another device comprising the functions of the terminal device, or by a chip system (or chip) or other functional module capable of implementing the functions of the terminal device, which chip system or functional module is for example provided in the terminal device. This terminal device is for example referred to as sixth terminal device. The method comprises the following steps: and under the first subcarrier interval, if the first time domain unit occupied by the sixth terminal equipment is the last time domain unit in COT, taking at least 5 time domain units at the tail part of the first time domain unit as intervals.

The embodiment of the application can reserve enough time for channel detection so as to improve the success rate of the terminal equipment for accessing the channel. In addition, the terminal equipment in the embodiment of the application does not need to leave out a time domain unit for channel detection, so that the resource waste can be reduced.

In a fifteenth aspect, there is provided a fifteenth communication method executable by a terminal device, or by another device comprising the functionality of the terminal device, or by a chip system (or chip) or other functional module capable of implementing the functionality of the terminal device, the chip system or functional module being provided in the terminal device, for example. This terminal device is for example referred to as sixth terminal device. The method comprises the following steps: and under the first subcarrier interval, if a second time domain unit in the COT comprises a first access point and a second access point, and the second access point is positioned in a 4 th time domain sub-unit of the second time domain unit, taking at least 2 time domain sub-units at the tail part of the first time domain unit in the COT as intervals, wherein the second time domain unit is the next time domain unit of the first time domain unit.

At least 2 time domain units at the tail of the first time domain unit and 3 time domain units at the head of the second time domain unit are added, the number of the time domain units is more than or equal to 5, the time requirement of the terminal equipment on channel detection can be met, and the channel access success rate of the terminal equipment is improved. Moreover, the method makes it unnecessary for the sixth terminal device to reserve too many GAPs in the first time domain unit, and can increase the amount of available resources of the sixth terminal device in the first time domain unit.

In a sixteenth aspect, there is provided a sixteenth communication method executable by a terminal device, or by another device comprising the functionality of the terminal device, or by a system-on-chip (or chip) or other functional module capable of implementing the functionality of the terminal device, the system-on-chip or functional module being provided in the terminal device, for example. This terminal device is for example referred to as fifth terminal device. The method comprises the following steps: determining COT at a first subcarrier interval, wherein a first time domain unit in the COT is configured with side feedback channel resources; and executing transmission in the first time domain unit, wherein the time domain resource and the frequency domain resource where the sidestream feedback channel resource is positioned are used for transmitting sidestream data, or the sidestream feedback channel resource is not enabled.

The first time domain unit originally includes SL feedback channel resources, but in order to increase the number of symbols used for transmitting SL information in the first time domain unit, the fifth terminal device may use the location of the SL feedback channel resources for transmitting SL information, instead of for transmitting the SL feedback channel, thereby increasing the number of available resources of the fifth terminal device in the first time domain unit and reducing the transmission delay of the SL information.

A seventeenth aspect provides a communication device. The communication apparatus may be the first terminal device of any one of the first to sixteenth aspects. The communication device has the function of the first terminal device. The communication means are for example a first terminal device, or a larger device comprising the first terminal device, or a functional module in the first terminal device, such as a baseband device or a system on chip, etc. In an alternative implementation, the communication device includes a baseband device and a radio frequency device. In another alternative implementation, the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiver unit (sometimes also referred to as a transceiver module). The transceiver unit can realize a transmission function and a reception function, and may be referred to as a transmission unit (sometimes referred to as a transmission module) when the transceiver unit realizes the transmission function, and may be referred to as a reception unit (sometimes referred to as a reception module) when the transceiver unit realizes the reception function. The transmitting unit and the receiving unit may be the same functional module, which is called a transceiver unit, and which can implement a transmitting function and a receiving function; or the transmitting unit and the receiving unit may be different functional modules, and the transceiver unit is a generic term for these functional modules.

In an optional implementation manner, the transceiver unit (or the transmitting unit) is configured to transmit the sideline information in a first time domain unit at a first subcarrier interval, where if a second time domain unit is a time domain unit occupied by a sideline synchronization signal, a transmission end position of the sideline information in the first time domain unit and a transmission start position of the sideline synchronization signal in the second time domain unit are spaced by at least two sub-time domain units, and the second time domain unit is a next time domain unit of the first time domain unit.

In an optional implementation manner, the processing unit is configured to, at a first subcarrier interval, if a second time domain unit is a time domain unit occupied by a sidelink synchronization signal, not occupy a first time domain unit when determining a resource for transmitting sidelink information or when transmitting sidelink information, where the second time domain unit is a next time domain unit of the first time domain unit.

In an alternative embodiment, the communication apparatus further comprises a storage unit (sometimes also referred to as a storage module), the processing unit being configured to be coupled to the storage unit and execute a program or instructions in the storage unit, to enable the communication apparatus to perform the functions of the first terminal device according to any one of the first to sixteenth aspects.

In an eighteenth aspect, a communication device is provided. The communication means may be the second terminal device of any one of the first to sixteenth aspects above. The communication device has the function of the second terminal device. The communication means is for example a second terminal device, or a larger device comprising the second terminal device, or a functional module in the second terminal device, such as a baseband device or a system on chip, etc. In an alternative implementation, the communication device includes a baseband device and a radio frequency device. In another alternative implementation, the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiver unit (sometimes also referred to as a transceiver module). Reference may be made to the description of the seventeenth aspect for an implementation of the transceiver unit.

In an alternative embodiment, the transceiver unit (or the transmitting unit) is configured to transmit a side line synchronization signal at a first subcarrier interval, where a time domain resource used for transmitting the side line synchronization signal includes at least two consecutive time domain units, a first time domain unit of the at least two consecutive time domain units is idle, and a second time domain unit of the at least two consecutive time domain units is configured to carry the side line synchronization signal.

In an optional implementation manner, the transceiver unit (or the transmitting unit) is configured to transmit a side line synchronization signal at a first subcarrier interval, where the number of resource blocks occupied by the side line synchronization signal is 24, or the number of resource blocks occupied by the side line synchronization signal is greater than or equal to a first value, where the first value is determined according to the number of subfield units occupied by the side line synchronization signal at the first subcarrier interval and the number of subfield units occupied by the side line synchronization signal at a second subcarrier interval.

In an alternative embodiment, the communication apparatus further comprises a storage unit (sometimes also referred to as a storage module), the processing unit being configured to be coupled to the storage unit and execute a program or instructions in the storage unit, to enable the communication apparatus to perform the functions of the second terminal device according to any one of the first to sixteenth aspects.

In a nineteenth aspect, a communication device is provided. The communication apparatus may be the third terminal device of any one of the first to sixteenth aspects. The communication device has the function of the third terminal device. The communication means are for example a third terminal device, or a larger device comprising the third terminal device, or a functional module in the third terminal device, such as a baseband device or a system on chip, etc. In an alternative implementation, the communication device includes a baseband device and a radio frequency device. In another alternative implementation, the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiver unit (sometimes also referred to as a transceiver module). Reference may be made to the description of the seventeenth aspect for an implementation of the transceiver unit.

In an alternative embodiment, the transceiver unit (or the transmitting unit) is configured to transmit or receive the sideline information at a first subcarrier interval, where the communication device does not transmit or does not detect the sideline synchronization signal on a periodic resource used for transmitting the sideline synchronization signal. The side line information does not occupy a first time domain unit, wherein the first time domain unit is a time domain unit before a second time domain unit, and the second time domain unit is an additional resource for transmitting the side line synchronization signal; or the sidestream information is transmitted in a first time domain unit, the sidestream information is separated by at least two sub-time domain units between the transmission end position of the first time domain unit and the transmission start position of a sidestream synchronous signal in a second time domain unit, the first time domain unit is the previous time domain unit of the second time domain unit, and the second time domain unit is an additional resource for transmitting the sidestream synchronous signal; or the sidestream information is transmitted in a second time domain unit, wherein the time duration within 16 mu s before the second time domain unit is unoccupied, the second time domain unit is an additional resource for transmitting the sidestream synchronization signal, and the sidestream information comprises a first sidestream synchronization signal.

In an alternative embodiment, the communication apparatus further comprises a storage unit (sometimes also referred to as a storage module), the processing unit being configured to be coupled to the storage unit and execute a program or instructions in the storage unit, to enable the communication apparatus to perform the functions of the third terminal device according to any one of the first to sixteenth aspects.

In an alternative embodiment, the second terminal device and the third terminal device are the same terminal device or are different terminal devices.

In a twentieth aspect, a communication device is provided. The communication apparatus may be the fourth terminal device of any one of the first to sixteenth aspects. The communication device has the function of the fourth terminal device. The communication means is for example a fourth terminal device, or a larger device comprising the fourth terminal device, or a functional module in the fourth terminal device, such as a baseband device or a system on chip, etc. In an alternative implementation, the communication device includes a baseband device and a radio frequency device. In another alternative implementation, the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiver unit (sometimes also referred to as a transceiver module). Reference may be made to the description of the seventeenth aspect for an implementation of the transceiver unit.

In an optional implementation manner, the transceiver unit (or the receiving unit) is configured to receive, at a first subcarrier interval, shared information from a fifth terminal device, where the shared information includes first indication information, where the first indication information is used to indicate that a first resource in a COT is allocated to the fourth terminal device; the processing unit is configured to determine, according to the number of sub-field units serving as intervals located before the first resource, the number of bits of second indication information included in the shared information, where the second indication information is used to indicate a COT shared access mode.

In an alternative embodiment, the transceiver unit (or the receiving unit) is configured to receive, at a first subcarrier spacing, shared information from a fifth terminal device, where the shared information is used to allocate a first resource in a COT to the fourth terminal device; the processing unit is configured to determine, according to the number of sub-field units serving as intervals located before the first resource, to access the first resource by using a first COT shared access mode.

In an alternative embodiment, the transceiver unit (or the receiving unit) is configured to receive, at a first subcarrier interval, shared information from a fifth terminal device, where the shared information is used to allocate a first time domain unit in a COT to the fourth terminal device, and the first time domain unit includes a sidestream feedback channel resource; if the first time domain unit is the last time domain unit in the COT, the time domain resource and the frequency domain resource where the sidestream feedback channel resource is located are used for transmitting sidestream data, or the sidestream feedback channel resource is not enabled.

In an alternative embodiment, the communication apparatus further comprises a storage unit (sometimes also referred to as a storage module), the processing unit being configured to be coupled to the storage unit and execute a program or instructions in the storage unit, to enable the communication apparatus to perform the functions of the fourth terminal device according to any one of the first to sixteenth aspects.

In a twenty-first aspect, a communication device is provided. The communication apparatus may be the fifth terminal device of any one of the first to sixteenth aspects. The communication device has the function of the fifth terminal device. The communication device is, for example, a fifth terminal device, or a larger device comprising the fifth terminal device, or a functional module in the fifth terminal device, such as a baseband device or a chip system, etc. In an alternative implementation, the communication device includes a baseband device and a radio frequency device. In another alternative implementation, the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiver unit (sometimes also referred to as a transceiver module). Reference may be made to the description of the seventeenth aspect for an implementation of the transceiver unit.

In an optional implementation manner, the transceiver unit (or the sending unit) is configured to send sharing information to a fourth terminal device at a first subcarrier interval, where the sharing information includes first indication information used to allocate a first resource in the COT to the fourth terminal device, and the sharing information includes second indication information used to indicate a COT sharing access manner, and a number of bits of the second indication information is determined according to a number of sub-domain units serving as an interval before the first resource.

In an alternative embodiment, the processing unit is configured to determine a COT at a first subcarrier spacing, where a last time domain unit in the COT does not include a side feedback channel resource.

In an alternative embodiment, the processing unit is configured to determine the COT at the first subcarrier spacing; the processing unit is further configured to determine, according to the number of time domain units occupied by the fifth terminal device in the COT, an access point used by the fifth terminal device in the occupied first time domain unit.

In an alternative embodiment, the processing unit is configured to determine the COT at the first subcarrier spacing; the transceiver unit (or the transmitting unit) is configured to, if an upper layer of the fifth terminal device indicates that the fifth terminal device occupies one time domain unit in the COT to transmit data, and the fifth terminal device starts to perform transmission at a second access point in the time domain unit, perform retransmission of the transmission at a next time domain unit of the time domain unit.

In an alternative embodiment, the processing unit is configured to determine a COT at a first subcarrier spacing, where a first time domain unit in the COT is configured with a sidelink feedback channel resource; the transceiver unit (or the transmitting unit) is configured to perform transmission in the first time domain unit, where a time domain resource and a frequency domain resource where the sidelink feedback channel resource is located are used to transmit sidelink data, or the sidelink feedback channel resource is not enabled.

In an alternative embodiment, the communication apparatus further comprises a storage unit (sometimes also referred to as a storage module), the processing unit being configured to be coupled to the storage unit and execute a program or instructions in the storage unit, to enable the communication apparatus to perform the functions of the fifth terminal device according to any one of the first to sixteenth aspects.

In a twenty-second aspect, a communication device is provided. The communication apparatus may be the sixth terminal device of any one of the first to sixteenth aspects. The communication device has the function of the sixth terminal apparatus. The communication device is, for example, a sixth terminal device, or a larger device comprising the sixth terminal device, or a functional module in the sixth terminal device, such as a baseband device or a chip system, etc. In an alternative implementation, the communication device includes a baseband device and a radio frequency device. In another alternative implementation, the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiver unit (sometimes also referred to as a transceiver module). Reference may be made to the description of the seventeenth aspect for an implementation of the transceiver unit.

In an optional implementation manner, the processing unit is configured to take, at a first subcarrier spacing, at least 5 time domain sub-units at the tail of the first time domain unit as the spacing if the first time domain unit occupied by the sixth terminal device is the last time domain unit in the COT.

In an optional implementation manner, the processing unit is configured to, at a first subcarrier spacing, if a second time domain unit in the COT includes a first access point and a second access point, and the second access point is located in a 4 th sub-time domain unit of the second time domain unit, take at least 2 sub-time domain units at a tail of the first time domain unit in the COT as a spacing, and the second time domain unit is a next time domain unit of the first time domain unit.

In an alternative embodiment, the processing unit is configured to determine, at a first subcarrier spacing, a number of sub-field units serving as a spacing in the first time-field unit according to a COT shared access mode of a resource located after the first time-field unit.

In an alternative embodiment, the communication apparatus further comprises a storage unit (sometimes also referred to as a storage module), the processing unit being configured to be coupled to the storage unit and execute a program or instructions in the storage unit, to enable the communication apparatus to perform the functions of the sixth terminal device according to any one of the first to sixteenth aspects.

In an alternative embodiment, the sixth terminal device is a fifth terminal device or a fourth terminal device.

In a twenty-third aspect, a communication apparatus is provided, which may be a first terminal device, or a chip system for use in a first terminal device. The communication device comprises a communication interface and a processor, and optionally a memory. Wherein the memory is configured to store a computer program, and the processor is coupled to the memory and the communication interface, and when the processor reads the computer program or instructions, the processor causes the communication device to perform the method performed by the first terminal device in the above aspects.

In a twenty-fourth aspect, a communication device is provided, which may be the second terminal device, or a chip system for use in the second terminal device. The communication device comprises a communication interface and a processor, and optionally a memory. Wherein the memory is configured to store a computer program, and the processor is coupled to the memory and the communication interface, and wherein the processor, when reading said computer program or instructions, causes the communication device to perform the method performed by the second terminal device in the above aspects.

In a twenty-fifth aspect, a communication device is provided, which may be the third terminal device, or a chip system for use in the third terminal device. The communication device comprises a communication interface and a processor, and optionally a memory. Wherein the memory is configured to store a computer program, and the processor is coupled to the memory and the communication interface, and when the processor reads the computer program or instructions, the processor causes the communication device to perform the method performed by the third terminal device in the above aspects.

In a twenty-sixth aspect, a communication device is provided, which may be the fourth terminal device, or a chip system for use in the fourth terminal device. The communication device comprises a communication interface and a processor, and optionally a memory. Wherein the memory is configured to store a computer program, and the processor is coupled to the memory and the communication interface, and when the processor reads the computer program or instructions, the processor causes the communication device to perform the method performed by the fourth terminal device in the above aspects.

In a twenty-seventh aspect, a communication apparatus is provided, which may be the fifth terminal device, or a chip system for use in the fifth terminal device. The communication device comprises a communication interface and a processor, and optionally a memory. Wherein the memory is configured to store a computer program, and the processor is coupled to the memory and the communication interface, and when the processor reads the computer program or instructions, the processor causes the communication device to perform the method performed by the fifth terminal device in the above aspects.

In a twenty-eighth aspect, a communication device is provided, which may be the sixth terminal device, or a chip system for use in the sixth terminal device. The communication device comprises a communication interface and a processor, and optionally a memory. Wherein the memory is configured to store a computer program, and the processor is coupled to the memory and the communication interface, and when the processor reads the computer program or instructions, the processor causes the communication device to perform the method performed by the sixth terminal device in the above aspects.

A twenty-ninth aspect provides a first communication system comprising a first terminal device, wherein the first terminal device is configured to perform the method performed by the first terminal device according to any of the first to sixteenth aspects. For example, the first terminal device may be implemented by the communication apparatus according to the seventeenth aspect or the twenty-third aspect.

A thirty-first aspect provides a second communication system comprising a first terminal device, wherein the first terminal device is configured to perform the method performed by the first terminal device according to any of the first to sixteenth aspects. For example, the second terminal device may be implemented by the communication apparatus described in the eighteenth aspect or the twenty-fourth aspect.

A thirty-first aspect provides a third communication system comprising a third terminal device, wherein the third terminal device is adapted to perform the method performed by the third terminal device according to any of the first to sixteenth aspects. For example, the third terminal device may be implemented by the communication apparatus described in the nineteenth aspect or the twenty-fifth aspect.

A thirty-second aspect provides a fourth communication system comprising a fourth terminal device and a fifth terminal device, wherein the fourth terminal device is configured to perform the method performed by the fourth terminal device according to any one of the first to sixteenth aspects; the fifth terminal device is configured to perform the method performed by the fifth terminal device according to any of the first to sixteenth aspects. For example, the fourth terminal device may be implemented by the communication apparatus of the twentieth or twenty-sixth aspects; the fifth terminal device may be implemented by the communication apparatus according to the twenty-first aspect or the twenty-seventh aspect.

A thirty-third aspect provides a fifth communication system comprising a sixth terminal device, wherein the sixth terminal device is configured to perform the method performed by the sixth terminal device according to any of the first to sixteenth aspects. For example, the sixth terminal device may be implemented by the communication apparatus according to the twenty-second or twenty-eighth aspect.

In a thirty-fourth aspect, there is provided a computer-readable storage medium storing a computer program or instructions that, when executed, cause a method performed by any one or more of the first, second, third, fourth, fifth or sixth terminal devices of the above aspects to be performed.

In a thirty-fifth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the method of the above aspects to be carried out.

In a thirty-sixth aspect, a system on a chip is provided, comprising a processor and an interface, the processor being configured to invoke and execute instructions from the interface to cause the system on a chip to implement the methods of the above aspects.

Drawings

FIGS. 1A-1C are diagrams of 3 slot formats;

fig. 2A and 2B are two examples of slot switching;

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

fig. 4 is a flowchart of a first communication method according to an embodiment of the present application;

fig. 5 is a schematic diagram of a slot format according to an embodiment of the present application;

FIG. 6 is a flowchart of a second communication method according to an embodiment of the present application;

fig. 7 is a schematic diagram of a slot format according to an embodiment of the present application;

fig. 8 is a flowchart of a third communication method according to an embodiment of the present application;

Fig. 9 is a flowchart of a fourth communication method according to an embodiment of the present application;

fig. 10 is a flowchart of a fifth communication method according to an embodiment of the present application;

FIG. 11 is a flowchart of a sixth communication method according to an embodiment of the present application;

fig. 12A to 12C are schematic diagrams of 3 slot formats according to embodiments of the present application;

fig. 13A is a flowchart of a seventh communication method according to an embodiment of the present application;

fig. 13B is a flowchart of an eighth communication method according to an embodiment of the present application;

Fig. 14 is a flowchart of a ninth communication method according to an embodiment of the present application;

FIG. 15 is a schematic diagram showing that the last time slot in the COT does not include PSFCH resources according to an embodiment of the present application;

fig. 16 is a flowchart of a tenth communication method according to an embodiment of the present application;

FIG. 17 is a schematic diagram showing PSFCH resource disabling in the last slot in the COT according to an embodiment of the present application;

fig. 18 is a flowchart of an eleventh communication method according to an embodiment of the present application;

fig. 19A and 19B are schematic diagrams of a UE accessing a first access point but not a second access point according to an embodiment of the present application;

fig. 20 is a flowchart of a twelfth communication method according to an embodiment of the present application;

Fig. 21 is a schematic diagram of UE performing retransmission in an embodiment of the present application;

FIG. 22 is a flowchart of a thirteenth communication method according to an embodiment of the present application;

fig. 23 is a schematic diagram of a slot format according to an embodiment of the present application;

Fig. 24 is a flowchart of a fourteenth communication method according to an embodiment of the present application;

Fig. 25A and 25B are schematic diagrams of two slot formats according to an embodiment of the present application;

Fig. 26 is a flowchart of a fifteenth communication method according to an embodiment of the present application;

Fig. 27 is a flowchart of a sixteenth communication method according to an embodiment of the present application;

fig. 28 is a schematic diagram of a slot format according to an embodiment of the present application;

FIG. 29 is a schematic view of an apparatus according to an embodiment of the present application;

fig. 30 is a schematic view of yet another apparatus according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

In the embodiments of the present application, the number of nouns, unless otherwise indicated, means "a singular noun or a plural noun", i.e. "one or more". "at least one" means one or more, and "a 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-dependent object is an "or" relationship. For example, A/B, means: a or B. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c, represents: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, c may be single or plural.

The ordinal terms such as "first," "second," and the like in the embodiments of the present application are used for distinguishing a plurality of objects, and are not used for limiting the size, content, sequence, timing, priority, importance, and the like of the plurality of objects. In addition, the numbers of the steps in the embodiments described in the embodiments of the present application are only for distinguishing different steps, and are not used for limiting the sequence of the steps. For example, S1101 may occur before S1102, or may occur after S1102, or may also occur simultaneously with S1102.

In the following, some terms or concepts in the embodiments of the present application are explained for easy understanding by those skilled in the art.

(1) In the embodiment of the application, the terminal device is a device with a wireless transceiver function, and may be a fixed device, a mobile device, a handheld device (such as a mobile phone), a wearable device, a vehicle-mounted device, or a wireless apparatus (such as a communication module, a modem, or a chip system) built in the device. The terminal device is used for connecting people, objects, machines and the like, and can be widely used in various scenes, including but not limited to the following scenes: cellular communication, device-to-device (D2D), V2X, machine-to-machine/machine-like communication (M2M/MTC), internet of things (internet of things, ioT), virtual Reality (VR), augmented reality (augmented reality, AR), industrial control (industrial control), unmanned driving (SELF DRIVING), remote medical (remote medical), smart grid (SMART GRID), smart furniture, smart office, smart wear, smart transportation, smart city (SMART CITY), unmanned aerial vehicle, robot, and the like. The terminal device may sometimes be referred to as a UE, a terminal, an access station, a UE station, a remote station, a wireless communication device, or a user equipment, among others. For convenience of description, in the embodiment of the present application, a UE is taken as an example for illustrating a terminal device.

(2) The network device in the embodiment of the application comprises an access network device and/or a core network device. The access network equipment is equipment with a wireless receiving and transmitting function and is used for communicating with the terminal equipment. The access network devices include, but are not limited to, base stations (base transceiver stations (base transceiver station, BTS), node B, eNodeB/eNB, or gNodeB/gNB), transceiver points (transmission reception point, TRP), base stations for subsequent evolution of the third generation partnership project (3rd generation partnership project,3GPP), access nodes in wireless fidelity (WIRELESS FIDELITY, wi-Fi) systems, wireless relay nodes, wireless backhaul nodes, and the like. The base station may be: macro base station, micro base station, pico base station, small station, relay station, etc. Multiple base stations may support networks of the same access technology or may support networks of different access technologies. A base station may comprise one or more co-sited or non-co-sited transmission reception points. The access network device may also be a radio controller, a centralized unit (centralized unit, CU), and/or a Distributed Unit (DU) in the context of a cloud radio access network (cloud radio access network, CRAN). The access network device may also be a server or the like. For example, the network device in the vehicle-to-everything (vehicle to everything, V2X) technology may be a Road Side Unit (RSU). The following describes an access network device using a base station as an example. The base station may communicate with the terminal device or may communicate with the terminal device through the relay station. A terminal device may communicate with multiple base stations in different access technologies. The core network device is used for realizing the functions of mobile management, data processing, session management, policy and charging, etc. The names of devices implementing the core network function in the systems of different access technologies may be different, and the embodiment of the present application is not limited to this. Taking the fifth generation (the 5th generation,5G) mobile communication system as an example, the core network device includes: access and mobility management functions (ACCESS AND mobility management function, AMF), session management functions (session management function, SMF), policy control functions (policy control function, PCF), or user plane functions (user plane function, UPF), etc.

In the embodiment of the present application, the communication device for implementing the function of the network device may be a network device, or may be a device capable of supporting the network device to implement the function, for example, a chip system, and the device may be installed in the network device. In the technical solution provided in the embodiment of the present application, the device for implementing the function of the network device is exemplified by the network device, and the technical solution provided in the embodiment of the present application is described.

(3) Unlicensed spectrum and listen before talk (listen before talk, LBT) mechanisms.

In the scenario where the UE communicates with the base station, the spectrum resources used are divided into licensed (licensed) spectrum and unlicensed spectrum. Licensed spectrum can only be used by some organizations or operators, unlicensed spectrum is shared spectrum, and can be used by different operators/organizations. In order to fairly use unlicensed spectrum, a UE or a base station needs to perform an LBT procedure (which may also be referred to as a channel access procedure) before transmitting data. If it is determined that the channel is busy according to the LBT procedure, the UE or the base station cannot transmit data using the channel; and if it is determined that the channel is idle according to the LBT procedure, the UE or the base station may transmit data through the channel.

(4) Slot structure.

With the evolution of communication technology, the interconnection of everything is also continuously accelerating. The third generation partnership project (3rd g2eneration partnership project,3GPP) introduced support for V2X and like services in long term evolution (long term evolution, LTE) in order to extend the 3GPP platform to the automotive industry. The relevant design of the New Radio (NR) V2X was then investigated and provided with three slot structures as shown in fig. 1A to 1C.

Fig. 1A is a slot structure for transmitting data. The 1 st symbol of the slot is an automatic gain control (automatic gain control, AGC) and the content of the symbol is a repetition of the content of the 2 nd symbol. The last symbol in the slot is the GAP symbol. The 2 nd to 13 th symbols of the slot are used to carry a Physical Sidelink Control Channel (PSCCH) and a physical sidelink shared channel (PHYSICAL SIDELINK SHARED CHANNEL, PSSCH), wherein the PSCCH is typically located between the 2 nd to 4 th symbols of the slot and is configurable by configuration information of the resource pool.

Fig. 1B is a slot structure of a band PSFCH for transmitting data. The 1 st symbol of the slot is AGC. The PSCCH and PSSCH carried by the slot ends at symbol 10, followed by a GAP symbol for transmit-receive conversion, and then by the symbol PSFCH occupied 2. The purpose of setting the GAP symbol prior to PSFCH is that the UE transmitting the PSSCH may need to receive PSFCH, thus giving a GAP of 1 symbol. After PSFCH channels, there is still one GAP symbol for the purpose of transmit-receive transition, since the UE that was in the receive state before may have to transmit in the next slot.

Fig. 1C is a slot structure of a SL synchronization signal. The 1 st symbol, and 6 th to 13 th symbols of the slot are used to transmit PSBCH, the 2 nd and 3 rd symbols are used to transmit S-PSS, and the 4 th and 5 th symbols are used to transmit S-SSS. The time slot where the SL synchronization signal is located may be located outside the resource pool, so that the time slot does not collide with the time slot carrying the PSSCH.

Please refer to fig. 2A and fig. 2B again, which illustrate two examples of slot switching. Fig. 2A is a diagram showing a switch from the time slot shown in fig. 1A to the time slot shown in fig. 1C, and fig. 2B is a diagram showing a switch from the time slot shown in fig. 1B to the time slot shown in fig. 1C. In fig. 2A and 2B, the previous slot may be located in the resource pool for transmitting a channel such as PSSCH, and the next slot may be located outside the resource pool for transmitting a SL synchronization signal. After the slot carrying the SL synchronization signal, the next slot may be located in the resource pool again, and may be used to transmit the PSSCH, etc., which is not limited. The configuration information of the resource pool may indicate a time slot in which the SL synchronization signal is located, so that the time slot in which the SL synchronization signal is located may be avoided when selecting resources for the PSSCH.

(5)SL-U。

SL-U is an important topic in the current discussion, the main content being SL transmission in unlicensed spectrum. Because of unlicensed spectrum, the standard introduces two access mechanisms, type 1 and Type 2, respectively. Wherein Type 1 can be used for preempting the channel scenario, and LBT detection is required before SL transmission is performed.

Type2 can be used to share transmission resources that other UEs preempt in Type 1. For example, UE1 robs the COT with Type 1, and in the COT, in addition to the transmission resources occupied by UE1, UE1 may instruct other UEs to use the remaining transmission resources in the COT with Type 2. The maximum duration of the COT is related to a data priority, for example, a priority of a service (priority) or a channel access priority (CHANNEL ACCESS priority class, CAPC). For example, CAPC corresponds to a COT maximum duration of 2ms, CAPC 2 corresponds to a COT maximum duration of 4ms, and CAPC3 or CAPC corresponds to a COT maximum duration of 6ms or 10ms.

In addition, type2 can be further classified into Type2A, type B and the like. Type2A means that after the UE that preempts the COT is 25 μs apart after the transmission in the COT is finished, other UEs can occupy the channel in the COT. For example, other UEs may occupy the channel by sensing (e.g., by LBT detection) that the channel is idle for 25 μs. Type2B means that after the UE that preempts the COT is 16 μs apart after the transmission in the COT is finished, other UEs can occupy the channel in the COT.

The SL-U introduces a subcarrier spacing of 60kHz in addition to the existing 15kHz and 30kHz subcarrier spacing. At a subcarrier spacing of 60kHz, the length of one OFDM symbol is approximately 17.85 mus. As can be seen from fig. 1A or fig. 1B, only one GAP is at the end of one time slot, and if the SL synchronization signal is transmitted in the next time slot after the data transmission is completed (for example, as shown in fig. 2A or fig. 2B), the time of the one GAP is insufficient for the transmitting end of the SL synchronization signal to complete the channel listening process, which may cause the SL synchronization signal to be unable to be transmitted.

In view of this, in the embodiment of the present application, if the second time domain unit is a time domain unit occupied by the SL synchronization signal and the first time domain unit is a time domain unit preceding the second time domain unit, then at least two sub-time domain units are spaced between the transmission end position of the SL information in the first time domain unit and the transmission start position of the SL synchronization signal in the second time domain unit. For example, the SL synchronization signal occupies a first sub-time domain unit in the second time domain unit, and then the transmission end position of the SL information in the first time domain unit is spaced from the first sub-time domain unit by at least two sub-time domain units. For example, the sub-field unit is an OFDM symbol, it can be understood that at least two OFDM symbols may be used as GAPs at the end of the first time field unit, and even if the subcarrier interval is 60kHz, the duration of at least two OFDM symbols can meet the time requirement that the transmitting end of the SL synchronization signal listens to the channel, thereby enabling the SL synchronization signal to be transmitted and improving the transmission success rate of the SL synchronization signal.

The technical solution provided in the embodiment of the present application may be applied to a fourth generation mobile communication technology (the 4th generation,4G) system, for example, an LTE system, or may be applied to a 5G system, for example, an NR system, or may also be applied to a next generation mobile communication system or other similar communication systems, for example, a sixth generation mobile communication technology (the 6th generation,6G) system, etc., which is not specifically limited. The technical scheme provided by the embodiment of the application can be applied to SL transmission processes, such as D2D scenes, such as LTE-D2D scenes or NR-D2D scenes, or V2X scenes, such as NR-V2X scenes. For example, the method can be used in the fields of intelligent driving, auxiliary driving, intelligent network connection and the like.

Referring to fig. 3, a communication network architecture is shown for use in an embodiment of the present application. Fig. 3 includes UE1, UE2 and UE3, with SL communication being possible between UE1 and one or more UEs, fig. 3 being an example of UE1 being capable of SL communication with UE2 and UE3, and UE2 being capable of or incapable of communication with UE3, fig. 3 being an example of UE2 being capable of communication with UE 3. For example, UE1 may preempt the COT and may allocate resources within the COT to UE2 and/or UE 3. For another example, UE1 may transmit a SL synchronization signal and UE2 and/or UE3 may detect the SL synchronization signal. For another example, after one COT preempted by UE1 has ended, one or more of UE1, UE2, or UE3 may preempt the COT again.

In order to better describe the embodiments of the present application, the method provided by the embodiments of the present application is described below with reference to the accompanying drawings. The method provided by the embodiments of the present application can be applied to the network architecture shown in fig. 3, for example, the first UE involved in the method provided by the embodiments of the present application may be any UE of UE1, UE2 or UE3 in fig. 3; the second UE involved in the method provided by the embodiments of the present application may be any one of UE1, UE2 or UE3 in fig. 3; the third UE involved in the method provided by the embodiments of the present application may be any one of UE1, UE2 or UE3 in fig. 3; the fourth UE involved in the method provided by the embodiments of the present application may be UE2 or UE3 in fig. 3; the fifth UE involved in the method provided by the various embodiments of the present application may be UE1 in fig. 3; the sixth UE involved in the method provided by the various embodiments of the present application may be any one of UE1, UE2 or UE3 in fig. 3.

In various embodiments of the present application, the "SL" may be referred to as "sidelink" or may also simply be referred to as "sidelink". For example, the SL synchronization signal may be referred to as a side-uplink synchronization signal, or simply as a side-row synchronization signal; for another example, the SL information may be referred to as sidelink information, or simply as sidelink information. In various embodiments of the present application, the time domain unit is, for example, a Radio Frame (RF), and the sub-domain unit is, for example, a subframe (subframe), a slot, a mini-slot, or an OFDM symbol; or the time domain unit is a subframe, and the sub-domain unit is a time slot, a mini time slot or an OFDM symbol; or the time domain unit is a time slot, and the sub-domain unit is a mini time slot or an OFDM symbol; or the time domain unit is e.g. a mini slot, the sub-domain unit is e.g. an OFDM symbol etc. In various embodiments of the present application, the "OFDM symbol" is also simply referred to as a "symbol". In various embodiments of the application, a "resource pool" may refer to a "SL resource pool" in which resources may be used to transmit SL data. In various embodiments of the present application, the "SL synchronization signal" may also be referred to as a "SL synchronization signal block", such as a side line synchronization signal and physical broadcast channel (physical broadcast channel, PBCH) block (sidelink synchronization SIGNAL AND PBCH block, S-SSB). In various embodiments of the present application, the first subcarrier spacing is, for example, 60kHz, or may be 120kHz, or may be a greater value subcarrier spacing. In various embodiments of the present application, resources in the COT are allocated to other UEs, or alternatively, resources in the COT may be shared to other UEs, that is, in the scenario of COT resource sharing, the two concepts of "allocation" and "sharing" may be replaced with each other.

First, a first communication method provided by an embodiment of the present application is described, and please refer to fig. 4, which is a flowchart of the method.

S401, the first UE transmits SL information in the first time domain unit at the first subcarrier spacing. For example, if the first UE is UE1 in fig. 3, the receiving end of the SL information may be UE2 and/or UE3 in fig. 3, or a UE not included in fig. 3, and the embodiment of the present application does not limit the receiving end of the SL information, and fig. 4 is an example in which the second UE receives the SL information.

The next time domain unit of the first time domain unit is called a second time domain unit, for example, the first UE determines that the second time domain unit is used to carry the SL synchronization signal according to the information used to configure the resource pool for the first UE (in various embodiments of the present application, the information used to configure the resource pool may indicate the time domain resource and/or the frequency domain resource occupied by the SL synchronization signal, etc.), and then, at least two sub-time domain units may be spaced between the transmission end position of the SL information in the first time domain unit and the transmission start position of the SL synchronization signal in the second time domain unit. Wherein, the transmission start position and the transmission end position refer to time domain positions.

Alternatively, the at least two sub-time domain units may be located within the first time domain unit. For example, at least two sub-time domain units last (or tail) of the first time domain unit do not transmit SL information, or it is understood that at least two sub-time domain units last of the first time domain unit are idle, or it is understood that at least two sub-time domain units last of the first time domain unit may act as GAPs. In various embodiments of the present application, no individual UE is occupied for the subzone unit that is a GAP. Then for UEs using the first time domain unit (including the first UE and/or other UEs), the available resources within the first time domain unit may decrease and the SL information transmitted by those UEs in the first time domain unit may correspondingly decrease.

Or the at least two sub-time domain units may be located within the first time domain unit and the second time domain unit. For example, at least one sub-time domain unit last (or tail) of the first time domain unit does not transmit SL information and at least one sub-time domain unit beginning (or head) of the second time domain unit does not transmit SL information, or it is understood that at least one sub-time domain unit last of the first time domain unit and at least one sub-time domain unit beginning of the second time domain unit are idle, or it is understood that at least one sub-time domain unit last of the first time domain unit and at least one sub-time domain unit beginning of the second time domain unit may act as GAPs. In various embodiments of the present application, no individual UE is occupied for the subzone unit that is a GAP. Then for UEs using the first time domain unit (including the first UE and/or other UEs), the available resources within the first time domain unit may decrease, and the SL information transmitted by these UEs in the first time domain unit may also decrease accordingly; for UEs using the second time domain unit (including the first UE and/or other UEs), the available resources in the second time domain unit may also be reduced, and SL information transmitted by these UEs in the second time domain unit may be correspondingly reduced.

Taking the example that the time domain unit is a time slot and the sub-time domain unit is a symbol, the first time domain unit is the first time slot, at least two symbols at the end of the first time slot can be used as GAPs, and the transmitting end of the SL synchronization signal (possibly the first UE or other UEs) can monitor the channel during all or part of the duration of the at least two symbols. For example, the first subcarrier interval is 60kHz, and the duration of one symbol is about 17.85 μs at the subcarrier interval of 60kHz, so that the duration of the at least two symbols can be longer than 25 μs, thereby meeting the time requirement of the transmitting end of the SL synchronization signal on channel monitoring, so that the SL synchronization signal can be transmitted, and the transmission success rate of the SL synchronization signal is improved.

Alternatively, if the second time domain unit is located outside the resource pool, the scheme of the embodiment of the present application may be implemented, that is, the transmission end position of the SL information in the first time domain unit and the transmission start position of the SL synchronization signal in the second time domain unit may be separated by at least two sub-time domain units, and referring to fig. 5, fig. 5 is exemplified by that the time domain unit is a slot, the sub-time domain unit is a symbol, the SL synchronization signal is an S-SSB, and the transmission end position of the SL information in the first slot and the transmission start position of the S-SSB in the second slot are separated by 2 symbols, and the 2 symbols are located in the first slot. For example, in fig. 5, the first time slot is located in the resource pool and the second time slot is located outside the resource pool. Or if the second time domain unit is located in the resource pool, the technical solution of the embodiment of the present application may not be executed, for example, a sub-time domain unit may be spaced between the transmission end position of the SL information in the first time domain unit and the transmission start position of the SL synchronization signal in the second time domain unit, where the time domain unit is a time slot, and the sub-time domain unit is a symbol, for example, the first time domain unit is a first time slot, and the last of the first time slot may have only one symbol as a GAP.

For example, the resources used to transmit the S-SSB may be classified into periodic resources and additional resources (or non-periodic resources). Wherein, one periodic resource may be included in one transmission period of the S-SSB, and the one periodic resource may include one or more resources, that is, one or more resources for transmitting the S-SSB in one transmission period may be one or more, and the one or more resources are collectively referred to as one periodic resource. The S-SSB can be periodically transmitted by using periodic resources, and in general, if the transmission of the S-SSB on the periodic resources fails, additional resources are adopted to transmit the S-SSB; if the transmission of the S-SSB on the periodic resources is successful, no additional resources are employed to retransmit the S-SSB. It can be seen that the probability of transmitting S-SSB on additional resources is less than the probability of transmitting S-SSB on periodic resources. Where periodic resources may be located outside of the resource pool and additional resources may be located within the resource pool. Thus, alternatively, if the second time domain unit is located outside the resource pool, it may be indicated that the second time domain unit is a periodic resource; and if the second time domain unit is located in the resource pool, it may be indicated that the second time domain unit is an additional resource.

Then, if the second time domain unit is an additional resource, e.g. the second time domain unit is located in the resource pool of the first UE, indicating that there is less chance of using the second time domain resource for transmitting the S-SSB, in which case it may not be necessary to change the structure of the first time domain unit, e.g. the transmission end position of the SL information in the first time domain unit may be separated by a sub-time domain unit from the transmission start position of the SL synchronization signal in the second time domain unit. If the second time domain unit is a periodic resource, for example, the second time domain unit is located outside the resource pool of the first UE, which indicates that the probability of using the second time domain resource to transmit the S-SSB is relatively high, so that the time slot structure of the first time domain unit can be changed, and at least two sub-time domain units can be spaced between the transmission end position of the SL information in the first time domain unit and the transmission start position of the SL synchronization signal in the second time domain unit, so as to improve the transmission success rate of the S-SSB.

Or alternatively, the second time domain unit may be located in a resource pool of the first UE; or the second time domain unit may be located outside the resource pool of the first UE, and the second time domain unit is the first time domain unit in one transmission period of the SL synchronization signal for transmitting the SL synchronization signal, or is any time domain unit in one transmission period of the SL synchronization signal for transmitting the SL synchronization signal. That is, in these cases, the scheme of the embodiment of the present application may be performed such that the transmission end position of the SL information in the first time domain unit and the transmission start position of the SL synchronization signal in the second time domain unit may be separated by at least two sub-time domain units.

In this scheme, whether the second time domain unit is located in the resource pool of the first UE or outside the resource pool, the technical scheme of the embodiment of the present application may be used, that is, at least two sub-time domain units may be spaced between the transmission end position of the SL information in the first time domain unit and the transmission start position of the SL synchronization signal in the second time domain unit. Where, as described above, one periodic resource may be included in one transmission period of the S-SSB, and the one periodic resource may include one or more resources, for example, the second time domain unit is included in one resource of the one periodic resource. The second time domain unit may then be the first time domain unit for transmitting the SL synchronization signal in a transmission period of the SL synchronization signal, while for the time domain units preceding the remaining time domain units for transmitting the SL synchronization signal in the transmission period, the structure may not be changed, e.g. the transmission of these time domain units may be separated by one sub-time domain unit from the time domain position occupied by the SL synchronization signal in the next time domain unit. Generally, the SL synchronization signal may be transmitted in the first time domain unit for transmitting the SL synchronization signal in one transmission period, and thus if the second time domain unit is the first time domain unit for transmitting the SL synchronization signal in one transmission period, the slot structure of the first time domain unit before the second time domain unit may be changed to improve the transmission success rate of the SL synchronization signal. The subsequent time-domain units used to transmit the SL synchronization signal in the transmission period may not actually be used to transmit the SL synchronization signal, and thus the structure of the time-domain units preceding the time-domain units may not be changed to reduce the complexity of the communication system.

Or the second time domain unit may be any one of time domain units within one transmission period of the SL synchronization signal for transmitting the SL synchronization signal. The SL synchronization signal may be sent through one or more time domain units for sending the SL synchronization signal in one sending period, so for any one or more time domain units for sending the SL synchronization signal in one sending period, the time domain unit before the time domain unit may be changed in structure, so as to improve the sending success rate of the SL signal. Optionally, the second time domain unit is any one time domain unit used for transmitting the SL synchronization signal in one transmission period of the SL synchronization signal, and in one implementation manner, the second time domain unit is any one of N time domain units used for transmitting the SL synchronization signal in one transmission period of the SL synchronization signal, N is an integer greater than or equal to 2, and N is less than Q, where Q represents the total number of time domain units used for transmitting the SL synchronization signal in one transmission period of the SL synchronization signal, that is, the N time domain units are part of the Q time domain units. For example, the N time domain units are the first N time domain units for transmitting the SL synchronization signal in one transmission period. For example, the SL synchronization signal may be transmitted in the first time domain unit for transmitting the SL synchronization signal in one transmission period, and then, the SL synchronization signal may be continuously transmitted using the time domain unit for transmitting the SL synchronization signal after the transmission period to improve coverage of the SL synchronization signal. It may be considered that all of the first N time domain units for transmitting the SL synchronization signal in one transmission period may carry the SL synchronization signal, and thus a time domain unit preceding any one of the N time domain units may be caused to change a slot structure to improve a transmission success rate of the SL synchronization signal. Or the N time domain units may be any N time domain units for transmitting the SL synchronization signal in one transmission period, which is not limited.

The embodiment of the application can lead the transmission end position of the SL information in the first time domain unit and the transmission start position of the SL synchronous signal in the second time domain unit to be separated by at least two sub time domain units, so that the transmitting end of the SL synchronous signal has enough time to monitor the channel before transmitting the SL synchronous signal, and the success rate of transmitting the SL synchronous signal is improved.

Next, a second communication method provided by an embodiment of the present application is described, and referring to fig. 6, a flowchart of the method is shown.

S601, under a first subcarrier interval, the first UE transmits an SL synchronization signal in a Type 2B mode. For example, if the first UE is UE1 in fig. 3, the receiving end of the SL synchronization signal may include UE2 and/or UE3 in fig. 3, or include a UE not included in fig. 3, and the embodiment of the present application does not limit the receiving end of the SL synchronization signal, and fig. 6 is an example in which the second UE receives the SL synchronization signal.

For example, the protocol predefines that the SL synchronization signal is accessed to the PSBCH by adopting a Type 2B mode, or that the SL synchronization signal is preconfigured in the UE to be accessed to the PSBCH by adopting a Type 2B mode, in this case, for the transmitting end of the SL synchronization signal, the SL synchronization signal needs to be transmitted by adopting a Type 2B mode. Type 2B means that if the UE determines that the duration within 16 mus before performing LBT is unoccupied for one time domain unit, the time domain unit may be occupied. For example, the first UE determines, according to the configuration information of the resource pool, that the SL synchronization signal should be sent in the second time domain unit, then the first UE may monitor the channel before the second time domain unit, and if it is determined that the duration within 16 μs before the second time domain unit is unoccupied, then the second time domain unit may be occupied. For example, the first subcarrier interval is 60kHz, and the duration of the next symbol at 60kHz is about 17.85 μs, which can meet the requirement of 16 μs, so that the time slot structure of the previous time domain unit of the time domain unit where the SL synchronization signal is located does not need to be changed, for example, only one symbol at the end of the previous time domain unit can be used as GAP, and the transmission success rate of the SL synchronization signal can still be improved.

Alternatively, if the second time domain unit is located outside the resource pool, the scheme of the embodiment of the present application may be executed, that is, the first UE determines, according to the pre-configured or pre-defined information of the protocol, to access the PSBCH by using Type 2B, and referring to fig. 7, fig. 7 takes the example that the time domain unit is a time slot, the sub-domain unit is a symbol, and the SL synchronization signal is S-SSB, for example, in fig. 7, the first time slot is located in the resource pool, and the second time slot is located outside the resource pool. Or if the second time domain unit is located in the resource pool, the technical scheme of the embodiment of the application may not be executed, for example, the first UE may not determine the access mode of the PSBCH according to the pre-configured or pre-defined information of the protocol. For reasons for this, reference is made to the description of the embodiment shown in fig. 4.

Or alternatively, the second time domain unit may be located in a resource pool of the first UE; or the second time domain unit may be located outside the resource pool of the first UE, and the second time domain unit is the first time domain unit in one transmission period of the SL synchronization signal for transmitting the SL synchronization signal, or is any time domain unit in one transmission period of the SL synchronization signal for transmitting the SL synchronization signal. The description of this content may refer to the embodiment shown in fig. 4.

The embodiment of the application can ensure that the first UE accesses the PSBCH in a mode of adopting the Type 2B according to the pre-configured or pre-defined information of the protocol, so that the transmitting end of the SL synchronous signal has enough time to monitor the channel before transmitting the SL synchronous signal, and the success rate of transmitting the SL synchronous signal is improved.

Referring to fig. 8, a flowchart of a third communication method according to an embodiment of the present application is shown.

S801, under the first subcarrier spacing, if the second time domain unit is a time domain unit occupied by the SL synchronization signal, the first time domain unit is not occupied when the first UE determines a resource for transmitting SL information or when the first UE transmits the SL information. For example, if the first UE is UE1 in fig. 3, the receiving end of the SL information may be UE2 and/or UE3 in fig. 3, or a UE not included in fig. 3, and the embodiment of the present application does not limit the receiving end of the SL information, and fig. 8 is an example in which the second UE receives the SL information.

The next time domain unit of the first time domain unit is called a second time domain unit, for example, the first UE determines that the second time domain unit is used for carrying the SL synchronization signal according to the information used for configuring the resource pool for the first UE, and when the first UE selects the resource used for transmitting the SL information, the first UE may not select (or does not occupy) the first time domain unit, for example, excludes the first time domain unit from the candidate resources, so that the first UE does not naturally occupy the first time domain unit when transmitting the SL information; or the first UE may not occupy the first time domain unit when transmitting the SL information.

As an alternative embodiment, the transmitting end of the SL synchronization signal (e.g., the first UE or other UE) may send a signal related to the SL synchronization signal in the first time domain unit, e.g., send the repetition content on the first symbol of the SL synchronization signal, so as to occupy the first time domain unit and reduce the probability that the first time domain unit is preempted by UEs of other communication systems (e.g., wireless fidelity (WIRELESS FIDELITY, wiFi), etc.).

In various embodiments of the present application, for an idle time domain unit (e.g., a first time domain unit), each UE may not be occupied. Then the available resources may be reduced for UEs (including the first UE and/or other UEs) that may otherwise use the first time domain unit, and the SL information transmitted by these UEs may be correspondingly reduced.

Taking the example that the time domain unit is a time slot and the sub-time domain unit is a symbol, the first time domain unit is the first time slot, the first UE may not occupy the first time domain unit, the first time domain unit is idle, and the transmitting end of the SL synchronization signal (possibly the first UE or other UEs) may monitor the channel during all or part of the duration of the first time domain unit. For example, the first subcarrier interval is 60kHz, and the duration of one symbol is about 17.85 μs at the subcarrier interval of 60kHz, so that the total duration of the first time domain unit can be longer than 25 μs, thereby meeting the time requirement of the transmitting end of the SL synchronization signal on channel monitoring, so that the SL synchronization signal can be transmitted, and the transmission success rate of the SL synchronization signal is improved.

Alternatively, if the second time domain unit is located outside the resource pool, the scheme of the embodiment of the present application may be executed, that is, if the second time domain unit is a time domain unit occupied by the SL synchronization signal, the first UE does not occupy the first time domain unit when selecting a resource for transmitting SL information or when transmitting SL information. Or if the second time domain unit is located in the resource pool, the technical scheme of the embodiment of the application may not be executed, for example, the first UE may occupy the first time domain unit or not occupy the first time domain unit, which is determined according to the data transmission requirement of the first UE. For reasons for this, reference is made to the description of the embodiment shown in fig. 4.

The embodiment of the application can ensure that the first UE does not occupy the time domain unit before the S-SSB, so that the transmitting end of the SL synchronous signal has enough time to monitor the channel before the SL synchronous signal is transmitted, and the success rate of transmitting the SL synchronous signal is improved.

Referring to fig. 9, a flowchart of a fourth communication method according to an embodiment of the present application is shown.

S901, the first UE transmits a SL synchronization signal at a first subcarrier interval. For example, if the first UE is UE1 in fig. 3, the receiving end of the SL information may be UE2 and/or UE3 in fig. 3, or a UE not included in fig. 3, and the embodiment of the present application does not limit the receiving end of the SL synchronization signal, and fig. 9 is an example in which the second UE receives the SL synchronization signal.

Wherein, the time domain resource used for transmitting the SL synchronization signal (or the time domain resource allocated for the SL synchronization signal) may include at least two consecutive time domain units, a first time domain unit (e.g., referred to as a first time domain unit) in a time domain of the at least two consecutive time domain units may be idle, and a second time domain unit (e.g., referred to as a second time domain unit) in a time domain of the at least two consecutive time domain units may carry the SL synchronization signal. That is, the SL synchronization signal may be allocated more time domain units than are needed for the SL synchronization signal, such that the first UE is able to channel listen in the first time domain unit before the second time domain unit transmits the SL synchronization signal. For example, the first subcarrier interval is 60kHz, and the duration of one symbol is about 17.85 μs at the subcarrier interval of 60kHz, so that the total duration of the first time domain unit can be longer than 25 μs, thereby meeting the time requirement of the first UE on channel monitoring, so that the SL synchronization signal can be sent, and the sending success rate of the SL synchronization signal is improved. Alternatively, the time domain resources for transmitting the SL synchronization signal may be configured by information for configuring the resource pool for the first UE.

As an alternative embodiment, the transmitting end of the SL synchronization signal (e.g., the first UE or other UE) may send a signal related to the SL synchronization signal in the first time domain unit, for example, send the repetition content on the first symbol of the SL synchronization signal, so as to occupy the first time domain unit, and reduce the probability that the first time domain unit is preempted by UEs in other communication systems (e.g., wiFi and the like).

In various embodiments of the present application, for an idle time domain unit (e.g., the first time domain unit), each UE is not occupied. Then the available resources may be reduced for UEs (including the first UE and/or other UEs) that may otherwise use the first time domain unit, and the SL information transmitted by these UEs may be correspondingly reduced.

Alternatively, if the second time domain unit is located outside the resource pool, the scheme of the embodiment of the present application may be performed, that is, the time domain resource used for transmitting the SL synchronization signal may include at least two time domain units, a first time domain unit of the at least two time domain units may be idle, and a second time domain unit of the at least two time domain units may carry the SL synchronization signal. Or if the second time domain unit is located in the resource pool, the technical solution of the embodiment of the present application may not be executed, for example, the time domain resource for transmitting the SL synchronization signal includes one time domain unit. For reasons for this, reference is made to the description of the embodiment shown in fig. 4.

The embodiment of the application can ensure that the first UE does not occupy the first time domain unit allocated to the S-SSB, so that the first UE has enough time to monitor the channel before transmitting the SL synchronous signal, and the success rate of transmitting the SL synchronous signal is improved.

Referring to fig. 10, a flowchart of a fifth communication method according to an embodiment of the present application is shown.

S1001, at the first subcarrier spacing, the third UE transmits or receives SL information, where the third UE does not transmit or does not detect the SL synchronization signal on the periodic resource used for transmitting the SL synchronization signal. For example, the third UE may determine that no SL synchronization signal is transmitted or detected on the periodic resource before S1001.

Fig. 10 exemplifies that the third UE transmits SL information. For example, if the third UE is UE1 in fig. 3, the receiving end of the SL information may be UE2 and/or UE3 in fig. 3, or a UE not included in fig. 3, and the embodiment of the present application does not limit the receiving end of the SL information, and fig. 10 is an example in which the second UE receives the SL information.

The third UE may be a transmitting end of the SL synchronization signal or a receiving end (or a detecting end) of the SL synchronization signal. If the third UE is a transmitting end of the SL synchronization signal, the third UE does not transmit the SL synchronization signal on a periodic resource for transmitting the SL synchronization signal in S1001; or if the third UE is a receiving end of the SL synchronization signal, the third UE does not detect (or does not receive) the SL synchronization signal on the periodic resource for transmitting the SL synchronization signal in S1001.

As an alternative embodiment, the SL information does not occupy the first time domain unit. Wherein the first time domain unit is a time domain unit preceding the second time domain unit, and the second time domain unit is an additional resource for transmitting the SL synchronization signal. The SL information includes, for example, SL data and/or SL control information, etc. For the relevant content of this embodiment reference is made to the example shown in fig. 8.

As another alternative embodiment, the SL information is transmitted in the first time domain unit, and the transmission end position of the SL information in the first time domain unit is spaced from the transmission start position of the SL synchronization signal in the second time domain unit by at least two sub-time domain units, e.g., the last at least two sub-time domain units of the first time domain unit do not transmit the PSSCH. Wherein the first time domain unit is a time domain unit preceding the second time domain unit, and the second time domain unit is an additional resource for transmitting the SL synchronization signal. The SL information includes, for example, SL data and/or SL control information, etc. For the relevant content of this embodiment reference is made to the example shown in fig. 4.

As yet another alternative embodiment, the third UE accesses the second time domain unit using Type 2B. For example, the SL information is transmitted in a second time domain unit, and the third UE may access the second time domain unit using Type 2B. For example, the third UE may occupy the second time domain unit if the LBT is performed to determine that the duration within 16 μs before the second time domain unit is unoccupied. Wherein the second time domain unit is an additional resource for transmitting the SL synchronization signal. The SL information may include a SL synchronization signal, for example, referred to as a first SL synchronization signal. For the relevant content of this embodiment reference is made to the example shown in fig. 6.

The above three embodiments are three parallel schemes, and one scheme is executed. Which scheme is performed may be predefined by the protocol, preconfigured in the third UE, or determined by the third UE itself.

It may be understood that, in the embodiment of the present application, if the third UE does not detect or send the SL synchronization signal on the periodic resource, the third UE is likely to detect or send the SL synchronization signal on the additional resource, so that the previous time domain unit of the additional resource may not be occupied, or at least two sub time domain units may be spaced between the transmission of the previous time domain unit of the additional resource and the time domain position occupied by the SL synchronization signal on the additional resource, or the third UE may access the second time domain unit in a Type 2B manner, where all the manners are that the transmitting end of the SL synchronization signal (for example, the third UE or other UEs) has enough time to monitor the channel before the additional resource starts, so that the SL synchronization signal can be sent, thereby improving the transmission success rate of the SL synchronization signal.

Next, a sixth communication method according to an embodiment of the present application is described, and referring to fig. 11, a flowchart of the method is shown.

S1101, the fifth UE transmits the shared information to the fourth UE at the first subcarrier spacing. Accordingly, the fourth UE receives the shared information from the fifth UE at the first subcarrier spacing.

For example, the fifth UE preempts the COT and allocates resources within the COT to the fourth UE, the fifth UE may send the sharing information to the fourth UE, which may indicate the resources within the COT allocated to the fourth UE. For example, the shared information may include first indication information that may indicate resources allocated for the fourth UE, e.g., the first indication information indicates that the fourth UE is allocated the first resources within the COT. The fourth UE can determine the first resource after receiving the shared information, so that the first resource can be used.

S1102, the fourth UE determines the number of bits of the second indication information included in the shared information according to the first subcarrier spacing and/or according to the number of subzone units as GAPs located before the first resource.

Optionally, the first resource is, for example, a SL feedback channel resource, for example, PSFCH resources, included in the first time domain unit in the COT. The subfield unit as GAP located before the first resource may include the subfield unit as GAP located before the PSFCH resource within the first time field unit.

Or the first resource is, for example, a first time domain unit in the COT, a subdomain unit as a GAP located before the first resource may include a subdomain unit as a GAP located before the first time domain unit in the COT, for example, a tail of a previous time domain unit of the first time domain unit in the COT is a subdomain unit of the GAP.

The shared information may further include second indication information, which may indicate a COT shared access mode. The fourth UE may determine the number of bits occupied by the second indication information according to the first subcarrier spacing or according to the number of sub-field units located before the first resource as GAPs, thereby being able to decode the second indication information. For example, the number of sub-resource units as GAPs before the first resource may have an association relationship with the subcarrier spacing, and the fourth UE may determine the number of sub-field units as GAPs before the first resource by determining the subcarrier spacing, so the fourth UE may determine the number of bits of the second indication information according to the subcarrier spacing or according to the number of sub-field units as GAPs before the first resource.

The COT shared access mode may be used to determine how to access the first resource, or determine how to use the first resource. Alternatively, the fifth UE may determine the number of bits occupied by the second indication information in the same manner as the fourth UE, thereby transmitting the second indication information.

Alternatively, if the number of sub-resource units located before the first resource as GAPs is 1 and/or the first subcarrier spacing is a subcarrier spacing of 60kHz or greater, the number of bits occupied by the second indication information may be 1. For example, the number of sub-resource units located before the first resource as GAPs is 1, and the sub-carrier interval greater than or equal to 60kHz is in association with each other, so the fourth UE may determine the number of bits occupied by the second indication information according to either one of the two.

For example, when the number of bits occupied by the second indication information is 1, the second indication information may indicate that the COT shared access mode is Type 2B or Type 2C. For example, if the value of the second indication information is "1" or "true", the COT shared access mode is indicated as Type 2B, and if the value of the second indication information is "0" or "false", the COT shared access mode is indicated as Type 2C; or if the value of the second indication information is "0" or "false", the COT sharing access mode is indicated to be Type 2B, and if the value of the second indication information is "1" or "true", the COT sharing access mode is indicated to be Type 2C.

And the Type 2B is that if the duration within 16 mu s before the first resource is unoccupied, the first resource can be occupied, otherwise, the first resource cannot be occupied. For example, the first subcarrier spacing is 60kHz, the duration of one symbol is approximately 17.85 mus. And when the Type 2B is used, the fourth UE only needs 16 μs to monitor, so that the number of subzone units as GAPs located before the first resource is 1, which can also meet the monitoring requirement of the fourth UE, so that the fourth UE can use the first resource.

Type 2C is that channel detection (e.g., LBT) need not be performed before transmission is performed by the first resource, and if the duration of the first resource is less than or equal to 584 μs, the first resource can be occupied, otherwise the first resource cannot be occupied. When Type 2C is used, the fourth UE does not have to monitor the channel before the first resource, for example, LBT is not performed, so that the number of sub-field units as GAPs before the first resource is 1 can also satisfy the monitoring requirement of the fourth UE, so that the fourth UE can use the first resource.

It can be seen that the second indication information may not indicate that the Type 2A mode is adopted to access the first resource, so that the GAP before the first resource of the fourth UE can meet the listening requirement of the fourth UE even for the first subcarrier interval, and the fourth UE can use the first resource. And because the second indication information can not indicate the Type 2A, the second indication information only needs to occupy 1 bit, but does not need to occupy 2 bits, thereby saving the cost of the shared information.

For example, for the fifth UE, if the second indication information is transmitted to the fourth UE, it may be determined that the fourth UE does not use Type 2A or that the fourth UE uses Type 2B or Type 2C. Then, if the time domain unit before the first resource is the time domain unit occupied by the fifth UE, the fifth UE may not change the structure of the time domain unit, for example, still reserve a sub-time domain unit at the last of the time domain unit as a GAP. Further, the fifth UE may further determine the number of sub-field units occupied by the PSSCH according to the second indication information, thereby determining available time-frequency resources.

Please refer to fig. 12A to 12C. The time slot in fig. 12A is, for example, a first time domain unit in the COT, where the time slot includes PSFCH resources, and the PSFCH resources are first resources according to an embodiment of the present application. For example, the fourth UE may access the PSFCH resources using Type 2A, so the PSFCH resources may include two symbols as GAPs before to meet the requirement that the fourth UE listens to the channel.

Or the time slot in fig. 12A is, for example, a second time domain unit in the COT, and the next time slot (not shown in fig. 12A) of the time slot is a first time domain unit, which is the first resource according to the embodiment of the present application. If the first time domain unit is used for transmitting SL data and/or SL control information, etc., the first time domain unit is allocated, for example, to the fourth UE; or if the first time domain unit is used to transmit the SL synchronization signal, the first time domain unit may be configured through the resource pool configuration information. For example, the fourth UE does not use Type 2A to access the first time domain unit, so the timeslot shown in fig. 12A may finally include a symbol as GAP, which not only can reserve more symbols to transmit SL data, but also can meet the requirement of the fourth UE to monitor the channel.

In addition, the fourth UE may determine that the 2 nd symbol (slot 1 in fig. 12B) to the 9 th symbol (slot 8 in fig. 12B) in the slot shown in fig. 12A are available for transmission of the PSSCH.

The time slot in fig. 12B is, for example, a first time domain unit in the COT, where the time slot includes PSFCH resources, and the PSFCH resources are first resources according to the embodiment of the present application. For example, the fourth UE may access the PSFCH resources using Type 2A, so the PSFCH resources may include two symbols as GAPs before to meet the requirement that the fourth UE listens to the channel.

Or the time slot in fig. 12B is, for example, a second time domain unit in the COT, and the next time slot (not shown in fig. 12B) of the time slot is a first time domain unit, and the first time domain unit is the first resource according to the embodiment of the present application. If the first time domain unit is used for transmitting SL data and/or SL control information, etc., the first time domain unit is allocated, for example, to the fourth UE; or if the first time domain unit is used to transmit the SL synchronization signal, the first time domain unit may be configured through the resource pool configuration information. For example, the fourth UE may access the first time domain unit using Type 2A, so the timeslot shown in fig. 12B may finally include two symbols as GAPs, so as to meet the requirement that the fourth UE listens to the channel.

In addition, the fourth UE may determine that the 2 nd symbol (slot 1 in fig. 12B) to the 8 th symbol (slot 7 in fig. 12B) in the slot shown in fig. 12B are available for transmission of the PSSCH.

The time slot in fig. 12C is, for example, a first time domain unit in the COT, where the time slot includes PSFCH resources, and the PSFCH resources are the first resources according to the embodiment of the present application. For example, the fourth UE does not use Type 2A to access the PSFCH resources, so the PSFCH resources may include a symbol as a GAP before, which not only can leave more symbols to transmit SL data, but also can meet the requirement of the fourth UE to monitor the channel.

Or the time slot in fig. 12C is, for example, a second time domain unit in the COT, and the next time slot (not shown in fig. 12C) of the time slot is a first time domain unit, which is the first resource according to the embodiment of the present application. The first time domain unit is allocated to, for example, a fourth UE. For example, the fourth UE may access the first time domain unit using Type 2A, so the timeslot shown in fig. 12C may finally include two symbols as GAPs, so as to meet the requirement that the fourth UE listens to the channel.

In addition, the fourth UE may determine that the 2 nd symbol (slot 1 in fig. 12B) to the 9 th symbol (slot 8 in fig. 12B) in the slot shown in fig. 12C are available for transmission of the PSSCH.

In the embodiment of the present application, the second indication information may relate to the number of sub-field units serving as GAPs before the first resource, and the UE receiving the second indication information may determine the number of bits of the second indication information according to the number of sub-field units serving as GAPs before the first resource, so as to improve the decoding success rate of the second indication information. And the bit number of the second indication information is determined in this way, without predefining or pre-configuring the bit number of the second indication information, so that the bit number occupied by the second indication information is more flexible and changeable. In addition, the second indication information does not need to indicate the Type 2A, so that the number of bits occupied by the second indication information can be reduced, and the overhead of sharing information is saved.

Next, referring to fig. 13A, a flowchart of a seventh communication method according to an embodiment of the present application is shown.

S1301, the fifth UE sends the shared information to the fourth UE at the first subcarrier spacing. Accordingly, the fourth UE receives the shared information from the fifth UE at the first subcarrier spacing. The sharing information may indicate resources, e.g., first resources, within the COT allocated for the fourth UE. For more details regarding S1301, reference may be made to S1101 of the embodiment shown in fig. 11.

S1302, the fourth UE determines to access the first resource by adopting the first COT sharing access mode according to the first subcarrier interval and/or according to the number of the sub-domain units serving as GAPs positioned in front of the first resource.

For an introduction of the contents of the first resource and the sub-field unit located before the first resource as GAP, etc., reference is made to S1102 of the embodiment shown in fig. 11.

For example, the number of sub-resource units as GAPs before the first resource may have an association relationship with the subcarrier spacing, and the fourth UE may determine the number of sub-field units as GAPs before the first resource by determining the subcarrier spacing, so the fourth UE may determine the number of bits of the second indication information according to the subcarrier spacing or according to the number of sub-field units as GAPs before the first resource.

Optionally, if the number of subzone units as GAPs located before the first resource is 1 and/or the first subcarrier spacing is a subcarrier spacing greater than or equal to 60kHz (for example, a subcarrier spacing of 120kHz or greater), the fourth UE may access the first resource in the first COT shared access manner. And if the number of sub-field units as GAPs located before the first resource is not 1, and/or the first subcarrier spacing is a subcarrier spacing (for example, 15kHz or 30kHz, etc.) smaller than 60kHz, the fourth UE may access the first resource in the first COT shared access manner, or may also access the first resource in other COT shared access manners, specifically in what COT shared access manner, may be preconfigured in the UE or predefined by a protocol, or may also be determined in other manners.

In the embodiment of the present application, the sharing information may not include the second indication information as described in the embodiment shown in fig. 11, but may preset the first COT sharing access mode. If the number of the subzone units serving as GAPs before the first resources is 1 and/or the first subcarrier spacing is greater than or equal to 60kHz, the fourth UE may access the first resources in a first COT shared access manner, thereby reducing overhead of shared information and enabling the fourth UE to determine the COT shared access manner.

Optionally, the first COT shared access mode may be a default (default) COT shared access mode, or a COT shared access mode predefined by a protocol, or a COT shared access mode preconfigured in the UE. The first COT shared access mode may be used to determine how to access the first resource, or determine how to use the first resource.

For example, the first COT shared access mode is Type 2B or Type 2C, and for description of these two shared access modes, reference is made to S1102 of the embodiment shown in fig. 11. For example, the first subcarrier spacing is 60kHz, the duration of one symbol is approximately 17.85 mus. If the number of subzone units as GAPs located before the first resource is 1, if the first COT shared access mode is Type 2A, the time requirement that the fourth UE listens to the channel before using the first resource cannot be satisfied. Therefore, the first COT shared access manner may be Type 2B or Type 2C, so that the number of subzone units serving as GAPs located before the first resource can meet the time requirement that the fourth UE listens to the channel before using the first resource, and the fourth UE can use the first resource.

For example, if the number of subzone units as GAPs preceding the first resource is 1 and/or the first subcarrier spacing is a subcarrier spacing greater than or equal to 60kHz (e.g., a subcarrier spacing of 120kHz or greater), the fourth UE may access the first resource with Type 2B or Type 2C; and if the number of sub-field units as GAPs located before the first resource is not 1 and/or the first subcarrier spacing is a subcarrier spacing less than 60kHz (e.g., 15kHz or 30kHz, etc.), the fourth UE may access the first resource using Type 2A.

According to the embodiment of the application, the UE can determine the first COT sharing access mode according to the predefined or preconfigured information without sending the information for indicating the COT sharing access mode, so that the transmission overhead can be reduced. Moreover, if the first subcarrier spacing is greater than or equal to 60kHz and/or the number of subzone units serving as GAPs before the first resource is 1, the first COT shared access manner may be Type 2B or Type 2C, so that the time requirement that the fourth UE listens to the channel before using the first resource can be met, the fourth UE can use the first resource, the resource utilization rate in the COT is improved, and the probability that the first resource is occupied by other UEs due to the fact that the fourth UE cannot be used is reduced.

An eighth communication method according to an embodiment of the present application is described below, and please refer to fig. 13B, which is a flowchart of the method. The step numbers in the embodiments of the present application are for distinguishing from the step numbers in other embodiments, and do not represent the sequence of steps with other embodiments. For example, S1303 in the embodiment of the present application indicates steps different from those in other embodiments, and does not indicate that it occurs after S1301 or S1302 in the embodiment shown in fig. 13A.

S1303, under the first subcarrier interval, the sixth UE determines the number of sub-domain units serving as GAPs in the first time domain unit according to the COT shared access mode of the resources located behind the first time domain unit.

The first time domain unit is a time domain unit for the sixth UE to transmit SL information (it may be understood that the sixth UE is a transmitting end on the first time domain unit), or the first time domain unit is a time domain unit for the sixth UE to receive SL information (it may be understood that the sixth UE is a receiving end on the first time domain unit). The resources located after the first time domain unit (referred to as first resources) refer to resources located after the first time domain unit in the time domain, and the first resources may include time domain resources and/or frequency domain resources. The first resource is, for example, a resource within the COT, and the UE that preempts the COT may be a sixth UE or other UE. For example, a UE (e.g., referred to as UE 1) that preempts the COT sends shared information, e.g., referred to as first shared information, to a certain UE (e.g., a fourth UE), the first shared information indicating a first resource, such that the first resource is allocated to the fourth UE. The step of the UE1 transmitting the first shared information may occur before or after S1303, or may also occur simultaneously with S1303.

The sixth UE sends SL information in the first time domain unit, where a receiving end of the SL information may be a fourth UE or other UEs; the fourth UE may also send SL information on the first resource, and a receiving end of the SL information may be the sixth UE or other UEs. In the embodiment of the present application, the SL information includes, for example, SL data and/or SL control information.

Alternatively, the first time domain unit may also be located within the COT. For example, UE1 is a sixth UE, then the sixth UE may itself occupy the first time domain unit within the COT; or UE1 is a UE other than the sixth UE, the UE1 may transmit sharing information, for example, so-called second sharing information, indicating the first time domain unit to the sixth UE, such that the first time domain unit is allocated to the sixth UE, before S1303.

The UE using the first time domain unit (sixth UE) is a different UE than the UE using the first resource (fourth UE), and the fourth UE uses a corresponding COT shared access mode to access the first resource before using the first resource. Optionally, the first shared information received by the fourth UE from UE1 may indicate, in addition to the first resource, a COT shared access mode, for example, type 2A, type B or Type 2C (for description of these types of COT shared access modes, reference may be made to the foregoing embodiments), so that the fourth UE may access the first resource according to the COT shared access mode indicated by UE 1. When UE1 transmits shared information, it may transmit the shared information by broadcasting, multicasting, or the like, and thus, other UEs than the UE to which the resource is allocated may receive the shared information. For example, if UE1 transmits the first shared information by broadcasting or multicasting, the sixth UE can receive the first shared information in addition to the fourth UE, and thus the sixth UE can determine the COT shared access method indicated by the first shared information, and thus the sixth UE can determine the number of sub-domain units serving as GAPs in the first time domain unit.

Optionally, if the COT shared access mode is Type 2A, the sixth UE may determine that the number of sub-domain units serving as GAPs in the first time domain unit is greater than or equal to 2, and the sixth UE may also perform rate matching on SL information transmitted in the first time domain unit according to the number. For example, the sixth UE determines that the number of subfield units with the first time field unit tail as GAPs is greater than or equal to 2. Taking the example that the sub-field unit is a symbol. For example, the first subcarrier spacing is 60kHz, the duration of one symbol is approximately 17.85 mus. If the first COT shared access mode is Type 2A, the sixth UE may determine the number of symbols at the tail of the first time domain unit as GAPs (for example, the number of symbols is greater than or equal to 2), and the fourth UE may monitor the channel in the symbol as GAPs, where the number of symbols can ensure a time requirement that the fourth UE monitors the channel before using the first resource.

When the sixth UE sends the SL information on the first time domain unit, the number of sub-domain units occupied by the SL information may be determined according to the number of sub-domain units serving as GAPs in the first time domain unit, and rate matching may be performed according to the number of sub-domain units. As described above, the UE1 may use a broadcast or multicast mode to send the first shared information, so that the receiving end of the sixth UE, or the receiving end of the SL information, may also receive the first shared information. After receiving the first shared information, the receiving end also knows the COTs shared access mode of the first resource, so that the number of the sub-domain units serving as GAPs in the first time domain unit can be determined to be greater than or equal to 2. According to the number, the receiving end can determine the number of sub-domain units occupied by the SL information on the first time domain unit, and further decode the received SL information accordingly.

The first time domain unit may or may not include SL feedback channel resources. If the first time domain unit includes SL feedback channel resources, the time domain structure of the first time domain unit may refer to fig. 12B or fig. 12C, taking the example that the number of sub-domain units as GAPs in the first time domain unit is equal to 2. In this case, the number of sub-field units occupied by SL information within the first time field unit is further reduced, for example, to 8 (e.g., fig. 12B) or 9 (e.g., fig. 12C) due to the presence of SL feedback channel resources. Then for the sixth UE, rate matching may be performed in terms of the 8 or 9 sub-time domain units to determine the transmitted signal (i.e., the SL information); for the receiving end of the SL information on the first time domain unit, the received SL information may be rate matched according to the 8 or 9 sub-time domain units to decode the SL information.

Optionally, if the COT shared access mode is Type 2B or Type 2C, the sixth UE may determine that the number of sub-domain units serving as GAPs in the first time domain unit is greater than or equal to 1, and the sixth UE may also perform rate matching on SL information transmitted in the first time domain unit according to the number. For example, the sixth UE determines that the number of subfield units with the first time field unit tail as GAPs is greater than or equal to 1. Taking the example that the sub-field unit is a symbol. For example, the first subcarrier spacing is 60kHz, the duration of one symbol is approximately 17.85 mus. If the first COT shared access mode is Type 2B or Type 2C, 1 symbol can meet the time requirement of the fourth UE for monitoring the channel, so that the sixth UE can determine the tail of the first time domain unit as the symbol number of the GAP (for example, the symbol number is greater than or equal to 1), thereby not only ensuring the time requirement of the fourth UE for monitoring the channel before using the first resource, but also saving the symbol number of the GAP, so that more resources can be used for transmitting SL information in the first time domain unit.

When the sixth UE sends the SL information on the first time domain unit, the number of sub-domain units occupied by the SL information may be determined according to the number of sub-domain units serving as GAPs in the first time domain unit, and rate matching may be performed according to the number of sub-domain units. As described above, the UE1 may use a broadcast or multicast mode to send the first shared information, so that the receiving end of the sixth UE, or the receiving end of the SL information, may also receive the first shared information. After receiving the first shared information, the receiving end also knows the COTs shared access mode of the first resource, so that the number of the sub-domain units serving as GAPs in the first time domain unit can be determined to be greater than or equal to 1. According to the number, the receiving end can determine the number of sub-domain units occupied by the SL information on the first time domain unit, and further decode the received SL information accordingly.

In the embodiment of the application, the UE using the time domain unit before the first resource can determine the number of the sub-domain units serving as the GAPs in the time domain unit according to the COT sharing access mode of the first resource, so that the time requirement of the UE using the first resource on monitoring channels can be met.

As can be seen from the foregoing, at the first subcarrier spacing, more sub-field units may be set in the time-field unit as GAPs, which may result in a reduced number of symbols in the time-field unit for transmitting SL data. To this end, an embodiment of the present application provides a ninth communication method by which symbols for transmitting SL data can be increased. Please refer to fig. 14, which is a flowchart of the method.

S1401, the fifth UE determines the COT at the first subcarrier spacing.

For example, the fifth UE may preempt the COT, and optionally, the fifth UE may also share resources within the COT to other UEs. Alternatively, the last time domain unit within the COT may not include SL feedback channel resources, e.g., PSFCH resources. Alternatively, it is understood that the time domain unit including the SL feedback channel resource may not be the last time domain unit within the COT. For example, referring to fig. 15, where slot 4 includes PSFCH resources, the fifth UE may not include slot 4 into the COT, i.e., the COT determined by the fifth UE may not include slot 4. Optionally, the SL feedback channel resource is a periodic resource, and may occur periodically, where the period of the SL feedback channel resource may be configured by configuration information of a resource pool, and the resource pool is a resource pool configured to the fifth UE.

After the last time domain unit in the COT ends, and the UE may restart to preempt the COT, so that the UE may need a certain time to monitor the channel, and thus the last time domain unit in the COT may set more symbols as GAPs, for example, set at least two symbols as GAPs. It can be seen that the last time-domain unit within the COT generally includes more symbols as GAPs. If the last time domain unit further includes SL feedback channel resources, the SL feedback channel resources cannot transmit SL data, which results in an excessively small number of symbols for transmitting SL data in the last time domain unit.

Or the last time-domain unit within the COT may include SL feedback channel resources and the fifth UE may occupy the last time-domain unit. Alternatively, the fifth UE may transmit the SL information on the time domain resource and the frequency domain resource where the SL feedback channel resource is located, or may not enable the SL feedback channel resource. The SL information includes, for example, SL data and/or SL control information, etc.

For this reason, in the embodiment of the present application, the last time domain unit may not include the SL feedback channel resource, or even if the last time domain unit includes the SL feedback channel resource, the SL feedback channel resource may be used to transmit SL information or not enabled, so that the last time domain unit may have more symbols for transmitting the SL information, which can reduce the transmission delay of the SL information. The SL information includes, for example, SL data and/or SL control information, etc.

A tenth communication method provided by the embodiment of the present application will be described, by which symbols for transmitting SL data can be added. Please refer to fig. 16, which is a flowchart of the method.

S1601, if the first time domain unit is the last time domain unit in the COT, the fourth UE transmits SL information on the time domain resource and the frequency domain resource where the SL feedback channel resource is located, or the fourth UE does not enable the SL feedback channel resource. The embodiment of the application does not limit the receiving end of the SL information.

Alternatively, before S1601, the fifth UE may transmit the sharing information to the fourth UE at the first subcarrier spacing. Accordingly, the fourth UE receives the shared information from the fifth UE at the first subcarrier spacing. For example, the fifth UE preempts the COT, and the shared information may allocate resources within the COT to the fourth UE. For example, the sharing information indicates that the first time domain unit within the COT is allocated to the fourth UE by the fifth UE. Wherein the first time domain unit may comprise SL feedback channel resources, e.g. comprise PSFCH resources. Optionally, the SL feedback channel resource is a periodic resource, and may occur periodically, where the period of the SL feedback channel resource may be configured by configuration information of a resource pool, and the resource pool is a resource pool configured to the fifth UE.

Alternatively, whether the fourth UE enables the SL feedback channel resources in the first time domain unit or not may be determined by the fourth UE itself. For example, if the first time domain unit is the last time domain unit in the COT, the time domain resource and the frequency domain resource where the SL feedback channel resource is located are used for transmitting SL information, or the SL feedback channel resource is not enabled. Or it is understood that, after S1601, if the first time domain unit is the last time domain unit in the COT, the fourth UE transmits SL information on the time domain resource and the frequency domain resource where the SL feedback channel resource is located, or the fourth UE does not enable the SL feedback channel resource. The SL information includes, for example, SL data and/or SL control information, etc. Referring to fig. 17, the last slot (slot 4 in fig. 17) within the cot includes PSFCH resources, the fourth UE may not enable the PSFCH resources.

Or whether the fourth UE enables SL feedback channel resources in the first time domain unit or not, may also be indicated by other UEs. For example, a UE (e.g., a fifth UE or other UE) may transmit an SCI in a first time domain unit, where if the first time domain unit is the last time domain unit in the COT and the first time domain unit includes SL feedback channel resources, the SCI may indicate that the SL feedback channel resources are not enabled or indicate that SL information is transmitted using the time domain resources and the frequency domain resources in which the SL feedback channel resources are located. Then, the fourth UE receives the SCI in the first time domain unit, and if the SCI indicates that the SL feedback channel resource is not enabled or indicates that the SL information is transmitted using the time domain resource and the frequency domain resource where the SL feedback channel resource is located, the fourth UE may not enable the SL feedback channel resource or may transmit the SL information using the time domain resource and the frequency domain resource where the SL feedback channel resource is located. Optionally, the target receiving end of the SCI may be a fourth UE, so that the fourth UE can determine that the SL feedback channel resource in the first time domain unit is not enabled; or the SCI may be sent by broadcast or multicast, etc., so that more UEs can make sure that the SL feedback channel resources in the first time domain unit are not enabled.

From the foregoing description of the embodiments, the last time-domain unit in the COT generally includes more symbols as GAPs. If the last time domain unit also includes PSFCH resources, then PSFCH resources cannot transmit SL data, which results in too few symbols in the last time domain unit for transmitting SL data. For this reason, in the embodiment of the present application, if the first time domain unit is the last time domain unit in the COT and the first time domain unit includes the SL feedback channel resource, the fourth UE may transmit SL information by using the time domain resource and the frequency domain resource where the SL feedback channel resource is located, or understand that the fourth UE does not enable the SL feedback channel resource. That is, the first time domain unit originally includes the SL feedback channel resource, but since the first time domain unit is the last time domain unit in the COT, in order to increase the number of symbols used for transmitting SL information in the first time domain unit, the fourth UE may use the location of the SL feedback channel resource for transmitting SL information, not for transmitting the SL feedback channel.

To improve the access success rate of unlicensed spectrum, 2 access points are introduced in one slot, e.g., AGC symbols in a slot can be understood as access points. It is understood to an access point that the UE may use the resources within the time slot from the access point. Wherein a first access point in a slot is located in a first symbol of the slot and a second access point may be located in a 4 th symbol or a 7 th symbol of the slot. If the UE is accessed at the second access point and the UE has not used the resources in the time slot before that, the number of symbols remaining in the time slot is small, resulting in too few symbols for transmission of SL data.

In view of this, the embodiment of the present application provides an eleventh communication method capable of increasing the number of symbols used for transmitting SL data. Please refer to fig. 18, which is a flowchart of the method.

S1801, the fifth UE determines the COT at the first subcarrier spacing.

S1802, the fifth UE determines an access point used by the fifth UE in the occupied first time domain unit according to the number of the time domain units occupied by the fifth UE in the COT.

According to the embodiment shown in fig. 3, the fifth UE may determine the data transmission duration of the fifth UE, so that the duration occupied by the fifth UE in the COT can be determined, that is, the number of time-domain units occupied by the fifth UE in the COT can be determined.

Alternatively, if the fifth UE occupies one time domain unit within the COT, or it is understood that the fifth UE occupies only one time domain unit within the COT, the fifth UE may start transmitting at the first access point within the time domain unit (or the fifth UE may access at the first access point within the time domain unit). For example, referring to fig. 19A and 19B, which are schematic diagrams of the fifth UE occupying one time domain unit in the COT, the time slots in fig. 19A and 19B represent the time slots occupied by the fifth UE in the COT. The AGC in fig. 19A represents the first access point in a time slot at which a fifth UE may access; the AGC in fig. 19B represents a second access point in a time slot where the fifth UE may not access in the embodiment of the present application. In the case that the fifth UE occupies only one time domain unit, if the second access point in the time domain unit starts to transmit, the number of remaining symbols in the time domain unit is smaller, i.e. the available resources in the time domain unit are smaller for the fifth UE, which may not meet the SL data transmission requirement of the fifth UE. In some cases (e.g., using the scheme of the foregoing embodiment), the time-domain unit may also include more symbols as GAPs, which may result in fewer resources being available within the time-domain unit. In this embodiment of the present application, if the fifth UE occupies only one time domain unit, the fifth UE may access to the first access point of the time domain unit, thereby increasing the number of available resources of the fifth UE and improving the SL data transmission success rate of the fifth UE.

Or if the fifth UE occupies a plurality of time domain units within the COT, the fifth UE may start transmitting at the first access point or the second access point within the first time domain unit of the plurality of time domain units. If the fifth UE occupies a plurality of time domain units within the COT, the fifth UE may access in a first time domain unit of the plurality of time domain units. Because the fifth UE occupies a plurality of time domain units, it indicates that the fifth UE has more resources available in the COT, so that the fifth UE may access at the first access point or the second access point of the first time domain unit, and may be specifically implemented by the fifth UE without limitation.

In the embodiment of the application, if the fifth UE occupies only one time domain unit, the fifth UE can access to the first access point of the time domain unit, so that the number of available resources of the fifth UE can be increased, and the SL data transmission success rate of the fifth UE is improved.

A twelfth communication method according to an embodiment of the present application is also capable of increasing the number of symbols used for transmitting SL data. Please refer to fig. 20, which is a flowchart of the method.

S2001, the fifth UE determines the COT at the first subcarrier spacing.

S2002, if the upper layer of the fifth UE indicates that the fifth UE occupies one time domain unit in the COT to send SL data and the fifth UE starts to perform transmission at the second access point in the time domain unit, the fifth UE performs retransmission at the next time domain unit of the time domain unit. Reference is made to the foregoing for an introduction to an access point.

The upper layer of the fifth unit is, for example, a MAC layer, and the MAC layer may inform the physical layer of the fifth UE of the data transmission duration of the fifth UE. For example, if the fifth UE occupies only one time domain unit in the COT, but the fifth UE accesses the second access point in the time domain unit, but does not access the first access point in the time domain unit, the number of remaining symbols in the time domain unit is smaller, i.e., the available resources in the time domain unit are smaller for the fifth UE, which may not meet the SL data transmission requirement of the fifth UE. In some cases (e.g., using the scheme of the foregoing embodiment), the time-domain unit may also include more symbols as GAPs, which may result in fewer resources being available within the time-domain unit. For this purpose, in the embodiment of the present application, if the fifth UE occupies only one time domain unit and is accessed at the second access point of the time domain unit, the fifth UE may perform retransmission in the next time domain unit of the time domain unit, that is, perform retransmission of SL data in the previous time domain unit in the next time domain unit. For example, referring to fig. 21, the fifth UE would otherwise occupy only slot 1 within the COT, and the fifth UE would begin transmitting at the second access point (AGC shown in fig. 21) of slot 1, so the fifth UE can perform retransmission of the transmission at slot 2. The transmission is, for example, a SL transmission. In this case, since slot 1 and slot 2 are occupied by the fifth UE, the symbol of GAP may not be included in the end of slot 1.

The next time domain unit may be located within the COT. It is understood that the fifth UE occupies only one time domain unit in the COT, but the fifth UE additionally occupies the next time domain unit in the COT because the fifth UE starts transmitting at the second access point of the time domain unit. And the next time domain unit may or may not have been allocated to the other UE by the fifth UE. That is, the retransmission of the fifth UE in the next time domain unit is a blind retransmission process, and may not collide with the transmissions of other UEs, and may also collide with the transmissions of other UEs. However, in this way, the number of available resources of the fifth UE can be increased, and the SL data transmission success rate of the fifth UE can be improved.

As can be seen from the foregoing embodiments, more symbols may be included as GAPs in one time domain unit, which results in fewer resources being available for transmitting SL data in the time domain unit. For this reason, the embodiment of the present application provides a thirteenth communication method by which resources for transmitting SL data in a time domain unit can be increased. Please refer to fig. 22, which is a flowchart of the method.

S2201, the second UE transmits the SL synchronization signal at the first subcarrier interval. For example, if the second UE is UE2 in fig. 3, the receiving end of the SL synchronization signal may be UE1 and/or UE3 in fig. 3, or a UE not included in fig. 3, which is not limited by the embodiment of the present application, and fig. 22 illustrates that the third UE receives the SL synchronization signal. The SL synchronization signal is, for example, S-SSB.

The number of resource blocks occupied by the SL synchronization signal is, for example, 24, or the number of resource blocks occupied by the SL synchronization signal may be greater than or equal to the first value. The resource block is, for example, a Resource Block (RB).

Because more symbols are introduced as GAPs in the time domain unit, fewer resources are available in the time domain unit. For example, referring to fig. 23, a schematic diagram of a slot structure where S-SSB is located is shown. As can be seen from fig. 23, 4 symbols are included as GAPs at the end of the slot, which results in a smaller number of symbols for transmitting S-SSBs within the slot. As can be seen from comparing fig. 1C and fig. 23, in the case that one slot includes 14 symbols, the number of symbols occupied by the PSBCH is reduced from 8 in fig. 1C to 5 in fig. 23 (without considering the first symbol in the slot); if an extended cyclic prefix (extended cyclic prefix, ECP) is employed, then one slot includes 12 symbols, and the number of symbols occupied by the PSBCH will be reduced from 6 to 3 (regardless of the first symbol in the slot).

Therefore, the embodiment of the application provides that the number of resources occupied by the SL synchronous signal can be expanded on the frequency domain. Currently, S-SSB generally occupies 11 RBs, or 11×12=132 subcarriers, in the frequency domain, and occupies 9 symbols, i.e., the number of occupied Resource Elements (REs) is 132×9=1188. Taking the resource block as an example of RB, in the embodiment of the present application, the number of resource blocks occupied by the SL synchronization signal may be 24, which is far greater than the number of RBs occupied by the current S-SSB, so as to increase the number of available resources in the slot, and improve the transmission success rate of the SL synchronization signal.

Or in the embodiment of the present application, the number of resource blocks occupied by the SL synchronization signal may be greater than or equal to the first value. The first value may be determined according to a number of subzone units occupied by PBSCH of the SL synchronization signal in one time zone unit at the first subcarrier interval and a number of subzone units occupied by PBSCH of the SL synchronization signal in one time zone unit at the second subcarrier interval. Alternatively, the value of the second subcarrier spacing may be less than the value of the first subcarrier spacing, for example, the first subcarrier spacing is 60kHz and the second subcarrier spacing is 15kHz or 30kHz.

For example, the first value may satisfy the following relationship:

for another example, the first value may satisfy the following relationship:

Wherein, Representing rounding up x.

The UE performs channel detection, e.g., LBT detection, before using the channel, and the detection duration corresponding to different data priorities is different. For example, referring to table 1, the detection durations corresponding to the different data priorities. Table 1 exemplifies that the data priority is CAPC.

TABLE 1

CAPC	Duration of detection	Number of symbols at 60kHz
			1	43μs	3
2	43μs	3
			3	52μs	3
4	88μs	5

The last column of table 1 shows the number of symbols corresponding to the corresponding detection duration at 60 kHz. For example, the detection duration is 43 mus, corresponding to 3 symbols at 60 kHz. As can be seen from table 1, the larger the value CAPC (or the lower CAPC), the longer the corresponding detection period.

For example, the UE determines to use slot 2 in the COT, the UE performs channel detection before this slot 2. If the symbol reserved as GAP in the previous slot (e.g., slot 1) of slot 2 is less, then the time in slot 1 may not meet the time requirement for the UE to perform channel detection, and the UE may continue to perform channel detection in slot 2, which results in that the UE may only start transmission at the second access point of slot 2 and not at the first access point of slot 2, and then the available resources in slot 2 for the UE are less. Moreover, the current standard discussion requires that PSFCH resources and the second access point cannot be present in one slot at the same time, and if a periodic PSFCH resource is configured and the period is 1, if slot 2 includes PSFCH resources, the UE needs to vacate slot 2 and can only access in the next slot of the slot, which also results in resource waste. Wherein reference is made to the foregoing related content for an introduction to an access point.

In view of this, the embodiments of the present application provide a fourteenth communication method by which the number of available resources of a UE can be increased and resource waste can be reduced. Please refer to fig. 24, which is a flowchart of the method.

S2401, under the first subcarrier spacing, if the first time domain unit occupied by the sixth UE is the last time domain unit in the COT, the sixth UE takes at least 3 last time domain subunits of the first time domain unit as GAPs.

The sixth UE may be, for example, a UE that preempts the COT (e.g., the fifth UE in the foregoing embodiment), or may be a UE to which another UE allocates resources within the COT (e.g., the fourth UE in the foregoing embodiment). The sixth UE occupies the first time domain unit within the COT, and if the first time domain unit is the last time domain unit within the COT, the next time domain unit (e.g., referred to as the second time domain unit) may be preempted by the UE (e.g., the sixth UE or other UEs other than the sixth UE). The UE may perform channel detection, e.g., LBT detection, before preempting the next time domain unit.

As can be seen from table 1, the time period required for UEs with different data priorities to perform channel detection may be different. For the UEs CAPC to CAPC3, the required detection duration is 3 sub-time domain units, so that the embodiment of the application can use the last at least 3 sub-time domain units of the first time domain unit as GAPs, at least can meet the time requirement of the UEs CAPC to CAPC3 on channel detection, so that the UEs CAPC to CAPC3 can be accessed at the first access point of the second time domain unit, or the UEs can also be selectively accessed at the second access point of the second time domain unit, which is not limited. Whereas for the UE CAPC4, access may be at the second access point of the second time domain unit, and access may not be at the first access point of the second time domain unit. For example, referring to fig. 25A, the slot is a first time domain unit, and the last 3 symbols in the slot are taken as GAPs to satisfy the time requirement of the UE for channel detection.

Optionally, in order to meet the time requirements of UEs with various data priorities for channel detection, the embodiment of the present application may further use at least 5 last sub-time domain units of the first time domain unit as GAPs, so that even if the data priority of the UE is CAPC, the last at least 5 sub-time domain units of the first time domain unit can also meet the time requirements of the UE for channel detection, so that the UEs CAPC to CAPC4 can be accessed at the first access point of the second time domain unit or can also be accessed at the second access point of the second time domain unit. For example, referring to fig. 25B, the slot is a first time domain unit, and the last 5 symbols in the slot are taken as GAPs to satisfy the time requirement of the UE for channel detection.

The embodiment of the application can reserve enough time for channel detection so as to improve the success rate of the UE accessing the channel. In addition, the UE does not need to be provided with a time domain unit for channel detection, so that the resource waste can be reduced.

The fifteenth communication method provided by the embodiment of the present application is described below, by which the number of available resources of the UE can be increased and resource waste can be reduced. Please refer to fig. 26, which is a flowchart of the method.

S2601, under the first subcarrier spacing, if the second time domain unit in the COT comprises the first access point and the second access point, and the second access point is located in the 4 th time domain subunit of the second time domain unit, the sixth UE takes at least 2 time domain subunits at the tail of the first time domain unit in the COT as GAPs. Reference is made to the foregoing for an introduction to an access point.

Wherein the second time domain unit is the next time domain unit of the first time domain unit. The sixth UE may be, for example, a UE that preempts the COT (e.g., the fifth UE described in the foregoing embodiment), or may be a UE to which another UE allocates resources in the COT (e.g., the fourth UE described in the foregoing embodiment). The sixth UE occupies the first time domain unit within the COT.

Taking the first subcarrier spacing of 60kHz as an example, as can be seen from table 1 above, the UE needs at most 5 symbols to detect the channel. While a time domain unit may include a first access point and a second access point, theoretically, the UE may access the channel using either of these two access points. Thus, in the embodiment of the present application, if the second time domain unit includes the first access point (referred to as the first access point) and the second access point (referred to as the second access point) in time domain sequence, and the second access point is located in the 4 th sub-time domain unit of the second time domain unit, which indicates that 3 symbols are available in the second time domain unit before the second access point, the sixth UE may use at least 2 sub-time domain units at the tail of the first time domain unit as GAPs. For UEs allocated with the second time domain unit, channel detection may be performed in at least 2 sub-time domain units at the end of the first time domain unit, and if the time is insufficient, channel detection may also be performed in one or more of the 3 sub-time domain units at the head of the second time domain unit.

Optionally, if the tail of the first time domain unit has 2 sub-time domain units as GAPs, according to table 1, UEs with data priority levels, such as CAPC 1-CAPC, can all access at the second access point of the second time domain unit, but cannot access at the first access point of the second time domain unit.

At least 2 time domain units at the tail of the first time domain unit and 3 time domain units at the head of the second time domain unit are added, the number of the time domain units is more than or equal to 5, the time requirement of the UE on channel detection can be met, and the channel access success rate of the UE is improved. And this way, the sixth UE does not need to reserve too many GAPs in the first time domain unit, and the amount of available resources of the sixth UE in the first time domain unit can be increased. In addition, in the embodiment of the application, the UE does not need to be free of a time domain unit for channel detection, so that the resource waste can be reduced.

The sixteenth communication method provided by the embodiment of the present application is described below, by which the number of available resources of the UE can be increased and resource waste can be reduced. Please refer to fig. 27, which is a flowchart of the method.

S2701, the fifth UE determines the COT at the first subcarrier spacing. For example, the fifth UE may preempt the COT. Wherein the first time domain unit within the COT is configured with SL feedback channel resources, e.g., PSFCH resources. Alternatively, the PSFCH resources may be periodic resources, and the period of the PSFCH resources may be configured by configuration information of a resource pool, for example, a resource pool of the fifth UE. The first time domain unit may comprise a first access point and a second access point, and reference is made to the relevant content of the foregoing for an introduction to the access points.

S2702, the fifth UE performs transmission in the first time domain unit, or the fifth UE transmits SL information in the first time domain unit. In various embodiments of the application, the transmission performed by the UE is, for example, a SL transmission. For example, if the fifth UE is UE1 in fig. 3, the receiving end of the transmission (or the SL information) may be UE2 and/or UE3 in fig. 3, or a UE not included in fig. 3, and the embodiment of the present application does not limit the receiving end of the transmission, and fig. 27 illustrates that the fourth UE receives the transmission. The transmission is, for example, a SL transmission. The SL information may include SL data and/or SL control information, etc.

The time domain resource and the frequency domain resource where the SL feedback channel resource is located are used for transmitting the SL information, or the fifth UE does not enable the SL feedback channel resource.

The fifth UE performs channel detection, e.g., LBT detection, using the first time domain unit. For example, the fifth UE occupies a sub-domain unit in the first time domain unit to perform channel detection, which may cause the fifth UE to be unable to access at the first access point in the first time domain unit and to access only at the second access point in the first time domain unit, so that less resources are available for the fifth UE in the first time domain unit. Thus, if the first time domain unit includes SL feedback channel resources, the time domain resource and the frequency domain resource where the SL feedback channel resources are located may be used to transmit SL information, or the SL feedback channel resources are not enabled. Referring to fig. 28, the time slot is, for example, the first time domain unit, and PSFCH resources originally configured in the time slot may not be enabled (two symbols in the dashed box in fig. 28 represent PSFCH resources) but are used for transmitting PSSCH. Fig. 28 illustrates an example of the fifth UE accessing at the second access point of the slot.

The fifth UE may have less available resources in the first time domain unit, and if the first time domain unit further includes PSFCH resources, PSFCH resources cannot transmit SL data, which results in an excessively small number of symbols for transmitting SL data in the first time domain unit. For this reason, in the embodiment of the present application, if the first time domain unit includes a SL feedback channel resource, the fifth UE may transmit SL information using the time domain resource and the frequency domain resource where the SL feedback channel resource is located, or understand that the fourth UE does not enable the SL feedback channel resource. That is, the first time domain unit originally includes the SL feedback channel resource, but in order to increase the number of symbols used for transmitting the SL information in the first time domain unit, the fifth UE may use the location of the SL feedback channel resource to transmit the SL information, instead of transmitting the SL feedback channel, so that the number of available resources of the fifth UE in the first time domain unit may be increased, and the transmission delay of the SL information may be reduced. In addition, in the embodiment of the application, the UE does not need to be free of a time domain unit for channel detection, so that the resource waste can be reduced.

Fig. 29 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication apparatus 2900 may be the first UE or circuitry of the first UE in the embodiments illustrated in any of the figures 4, 6, 8, 9 or 14 for implementing the method corresponding to the first UE in the method embodiments described above. Or the communication apparatus 2900 may be the second UE or circuitry of the second UE in the embodiments shown in any of the figures 4, 6, 8, 9, 10 or 22 for implementing the method corresponding to the second UE in the method embodiments described above. Or the communication apparatus 2900 may be a third UE or circuitry of the third UE in the embodiment shown in any of the figures in fig. 10 or 22 for implementing the method corresponding to the third UE in the method embodiment described above. Or the communication apparatus 2900 may be a fourth UE or circuitry of the fourth UE in the embodiment shown in any of fig. 11, 13A, 13B, 16 or 27 for implementing a method corresponding to the fourth UE in the above method embodiment. Or the communication apparatus 2900 may be a fifth UE or circuitry of the fifth UE in the embodiments shown in any of fig. 11, 13A, 16, 18, 20, or 27 for implementing a method corresponding to the fifth UE in the above method embodiments. Or the communication apparatus 2900 may be the sixth UE or circuitry of the sixth UE in the embodiments shown in any of fig. 13B, 24 or 26 for implementing the method corresponding to the sixth UE in the above-described method embodiments. Specific functions can be seen from the description of the method embodiments described above. One type of circuitry is, for example, a chip system.

The communication device 2900 includes at least one processor 2901. The processor 2901 may be configured to perform internal processing of the device, and to perform certain control processing functions. Optionally, the processor 2901 includes instructions. Alternatively, the processor 2901 may store data. Alternatively, the different processors may be separate devices, may be located in different physical locations, and may be located on different integrated circuits. Alternatively, the different processors may be integrated in one or more processors, e.g., integrated on one or more integrated circuits.

Optionally, the communication device 2900 includes one or more memories 2903 for storing instructions. Optionally, the memory 2903 may also store data therein. The processor and the memory may be provided separately or may be integrated.

Optionally, the communication device 2900 includes a communication line 2902, and at least one communication interface 2904. Among them, since the memory 2903, the communication line 2902, and the communication interface 2904 are optional, they are indicated by broken lines in fig. 29.

Optionally, the communication device 2900 may also include a transceiver and/or an antenna. Wherein the transceiver may be used to transmit information to or receive information from other devices. The transceiver may be referred to as a transceiver, a transceiver circuit, an input-output interface, etc. for implementing the transceiver function of the communication device 2900 through an antenna. Optionally, the transceiver comprises a transmitter (transmitter) and a receiver (receiver). Illustratively, a transmitter may be used to generate a radio frequency (radio frequency) signal from the baseband signal, and a receiver may be used to convert the radio frequency signal to the baseband signal.

The processor 2901 may include a general purpose central processing unit (central processing unit, CPU), microprocessor, application SPECIFIC INTEGRATED Circuit (ASIC), or one or more integrated circuits for controlling program execution in accordance with aspects of the present application.

Communication line 2902 may include a pathway to transfer information between the aforementioned components.

Communication interface 2904, uses any transceiver-like device for communicating with other devices or communication networks, such as ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area networks, WLAN), wired access network, etc.

The memory 2903 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that may store information and instructions, or an electrically erasable programmable read-only memory (ELECTRICALLY ERASABLE PROGRAMMABLE READ-only memory, EEPROM), a compact disc (compact disc read-only memory) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 2903 may be stand alone and may be coupled to the processor 2901 by a communications link 2902. Or the memory 2903 may be integral with the processor 2901.

The memory 2903 is used for storing computer-executable instructions for executing the present application, and is controlled by the processor 2901 for execution. The processor 2901 is configured to execute computer-executable instructions stored in the memory 2903, thereby implementing the communication method provided by the above-described embodiment of the present application.

Alternatively, the computer-executable instructions in the embodiments of the present application may be referred to as application program codes, which are not particularly limited in the embodiments of the present application.

In a particular implementation, as one embodiment, the processor 2901 may include one or more CPUs, such as CPU0 and CPU1 in fig. 29.

In a particular implementation, as one embodiment, the communication device 2900 may include multiple processors, such as the processor 2901 and the processor 2905 in fig. 29. Each of these processors may be a single-core (single-CPU) processor or may be a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

When the apparatus shown in fig. 29 is a chip, for example, a chip of a first UE, or a chip of a second UE, or a chip of a third UE, or a chip of a fourth UE, or a chip of a fifth UE, or a chip of a sixth UE, the chip includes a processor 2901 (may further include a processor 2905), a communication line 2902, and a communication interface 2904, and optionally, may further include a memory 2903. For example, communication interface 2904 may be an input interface, pins, or circuitry, etc. The memory 2903 may be a register, cache, or the like. The processor 2901 and the processor 2905 may be a general purpose CPU, microprocessor, ASIC, or one or more integrated circuits for controlling the execution of programs in the methods of any of the embodiments described above.

The embodiment of the application can divide the functional modules of the device according to the method example, for example, each functional module can be divided corresponding to each function, and two or more functions can be integrated in one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation. For example, in the case of dividing each functional module by corresponding each function, fig. 30 shows a schematic diagram of an apparatus, and the apparatus 3000 may be the first UE, the second UE, the third UE, the fourth UE, the fifth UE, or the sixth UE, or the chip in the first UE, the chip in the second UE, the chip in the third UE, the chip in the fourth UE, the chip in the fifth UE, or the chip in the sixth UE, which are involved in each method embodiment. The apparatus 3000 includes a transmitting unit 3001, a processing unit 3002, and a receiving unit 3003.

It should be understood that, the apparatus 3000 may be used to implement the steps performed by the first UE or the second UE or the third UE or the fourth UE or the fifth UE or the sixth UE in the method according to the embodiments of the present application, and the relevant features may be referred to the foregoing embodiments and are not described herein.

Alternatively, the functions/implementation procedures of the transmission unit 3001, the reception unit 3003, and the processing unit 3002 in fig. 30 may be implemented by the processor 2901 in fig. 29 calling computer-executable instructions stored in the memory 2903. Or the function/implementation procedure of the processing unit 3002 in fig. 30 may be implemented by the processor 2901 in fig. 29 calling computer-executable instructions stored in the memory 2903, and the function/implementation procedure of the transmitting unit 3001 and the receiving unit 3003 in fig. 30 may be implemented by the communication interface 2904 in fig. 29.

Alternatively, when the apparatus 3000 is a chip or a circuit, the functions/implementation processes of the transmitting unit 3001 and the receiving unit 3003 may also be implemented by pins or circuits or the like.

The present application also provides a computer readable storage medium storing a computer program or instructions that, when executed, implement a method performed by a first UE or a second UE or a third UE or a fourth UE or a fifth UE or a sixth UE in the foregoing method embodiments. Thus, the functions described in the above embodiments may be implemented in the form of software functional units and sold or used as independent products. Based on such understanding, the technical solution of the present application may be embodied in essence or contributing part or part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. The storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.

The present application also provides a computer program product comprising: computer program code which, when run on a computer, causes the computer to perform the method performed by the first UE or the second UE or the third UE or the fourth UE or the fifth UE or the sixth UE in any of the method embodiments described above.

The embodiment of the application also provides a processing device, which comprises a processor and an interface; the processor is configured to perform a method performed by the first UE or the second UE or the third UE or the fourth UE or the fifth UE or the sixth UE according to any of the above method embodiments.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Drive (SSD)), etc.

The various illustrative logical blocks and circuits described in connection with the embodiments of the present application may be implemented or performed with a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the general purpose processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software unit executed by a processor, or in a combination of the two. The software elements may be stored in RAM, flash memory, ROM, erasable programmable read-only memory (EPROM), EEPROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. In an example, a storage medium may be coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC, which may reside in a terminal device. In the alternative, the processor and the storage medium may reside in different components in a terminal device.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Although the embodiments of the present application have been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations thereof can be made without departing from the scope of the embodiments of the application. Accordingly, the present embodiments and figures are merely exemplary illustrations of embodiments of the application defined by the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents of the embodiments that fall within the scope of the embodiments of the application. It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present application without departing from the scope of the embodiments of the application. Thus, the embodiments of the present application are intended to include such modifications and alterations insofar as they come within the scope of the embodiments of the application as claimed and the equivalents thereof.

Claims

1. A communication method, applied to a first terminal device, the method comprising:

And transmitting side line information in a first time domain unit at a first subcarrier interval, wherein if a second time domain unit is a time domain unit occupied by a side line synchronizing signal, at least two sub-time domain units are spaced between a transmission end position of the side line information in the first time domain unit and a transmission start position of the side line synchronizing signal in the second time domain unit, and the second time domain unit is the next time domain unit of the first time domain unit.

2. The method of claim 1, wherein the last at least two sub-time domain units of the first time domain unit do not transmit a physical sidelink shared channel, PSSCH.

3. A method according to claim 1 or 2, characterized in that,

The second time domain unit is positioned in a resource pool of the first terminal equipment; or alternatively, the first and second heat exchangers may be,

The second time domain unit is positioned outside the resource pool of the first terminal equipment; or alternatively, the first and second heat exchangers may be,

The second time domain unit is located outside the resource pool of the first terminal device, and the second time domain unit is the first time domain unit used for sending the sidestream synchronous signal in one sending period of the sidestream synchronous signal, or is any time domain unit used for sending the sidestream synchronous signal in one sending period of the sidestream synchronous signal.

4. A method according to claim 3, wherein the second time domain unit is any one of the time domain units within one transmission period of the side line synchronization signal for transmitting the side line synchronization signal, and comprising:

the second time domain unit is any one of a plurality of time domain units for transmitting the side line synchronization signal in one transmission period of the side line synchronization signal.

5. The method according to any of claims 1-4, wherein the time domain unit is a time slot and the sub-domain unit is an orthogonal frequency division multiplexing, OFDM, symbol.

6. The method of any of claims 1-5, wherein the first subcarrier spacing is 60kHz.

7. A communication method, applied to a first terminal device, the method comprising:

and under the first subcarrier interval, if the second time domain unit is a time domain unit occupied by the sidestream synchronous signal, when determining resources for transmitting sidestream information or when transmitting sidestream information, not occupying the first time domain unit, wherein the second time domain unit is the next time domain unit of the first time domain unit.

8. The method of claim 7, wherein the step of determining the position of the probe is performed,

9. The method of claim 8, wherein the second time domain unit is any one of transmission periods of the side line synchronization signal for transmitting the side line synchronization signal, and comprises:

the second time domain unit is any one of time domain units of which the part in one transmission period of the side line synchronization signal is used for transmitting the side line synchronization signal.

10. The method according to any of claims 7-9, wherein the time domain unit is a slot and the sub-domain unit is an OFDM symbol.

11. The method according to any of claims 7-10, wherein the first subcarrier spacing is 60kHz.

12. A communication method, applied to a second terminal device, the method comprising:

And transmitting a side line synchronization signal at a first subcarrier interval, wherein time domain resources for transmitting the side line synchronization signal comprise at least two continuous time domain units, a first time domain unit in the at least two continuous time domain units is idle, and a second time domain unit in the at least two continuous time domain units is used for bearing the side line synchronization signal.

13. The method of claim 12, wherein the first subcarrier spacing is 60kHz.

14. A communication method, applied to a third terminal device, the method comprising:

Transmitting or receiving sidestream information at a first subcarrier spacing, wherein the third terminal device does not transmit or detect sidestream synchronization signals on periodic resources for transmitting sidestream synchronization signals, wherein,

The sidestream information does not occupy a first time domain unit, the first time domain unit is a time domain unit before a second time domain unit, and the second time domain unit is an additional resource for transmitting the sidestream synchronization signal; or alternatively

The sidelink information is transmitted in a first time domain unit, the sidelink information is separated by at least two sub-time domain units between the transmission end position of the first time domain unit and the transmission start position of a sidelink synchronizing signal in a second time domain unit, the first time domain unit is the previous time domain unit of the second time domain unit, and the second time domain unit is an additional resource for transmitting the sidelink synchronizing signal; or alternatively

The sidestream information is transmitted in a second time domain unit, wherein the time duration within 16 mu s before the second time domain unit is unoccupied, the second time domain unit is an additional resource for transmitting the sidestream synchronization signal, and the sidestream information comprises a first sidestream synchronization signal.

15. The method of claim 14, wherein the side-row information is transmitted in a first time domain unit, and wherein the last at least two sub-time domain units of the first time domain unit do not transmit the side-row information.

16. The method according to claim 14 or 15, wherein the first subcarrier spacing is 60kHz.

17. A communication device comprising a processor and a memory, the memory and the processor being coupled, the processor being configured to perform the method of any one of claims 1 to 6, or to perform the method of any one of claims 7 to 11, or to perform the method of any one of claims 12 to 13, or to perform the method of any one of claims 14 to 16.

18. A computer readable storage medium for storing a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 6 or to perform the method of any one of claims 7 to 11 or to perform the method of any one of claims 12 to 13 or to perform the method of any one of claims 14 to 16.

19. A chip system, the chip system comprising:

A processor and an interface from which the processor invokes and executes instructions which when executed by the processor implement the method of any one of claims 1 to 6, or implement the method of any one of claims 7 to 11, or implement the method of any one of claims 12 to 13, or implement the method of any one of claims 14 to 16.

20. A computer program product, characterized in that the computer program product comprises a computer program which, when run on a computer, causes the computer to carry out the method of any one of claims 1 to 6 or causes the computer to carry out the method of any one of claims 7 to 11 or causes the computer to carry out the method of any one of claims 12 to 13 or causes the computer to carry out the method of any one of claims 14 to 16.