CN112566062A - Resource allocation method for bypass communication system - Google Patents

Abstract

The invention provides a method for bypass transmission, which comprises the following steps: user Equipment (UE) determines configuration parameters of aggregation time slot transmission; based on the configuration parameters, the UE determines an aggregated time slot resource; and the UE performs a physical bypass shared channel PSCCH transmission and a corresponding physical bypass control channel PSCCH transmission on the aggregated slot resources.

Description

Resource allocation method for bypass communication system

Technical Field

The invention relates to the technical field of mobile communication, in particular to the technical field of 5G New Radio (NR) mobile communication. In particular, the invention relates to a resource allocation method for Vehicle-to-outside (V2X).

Background

In the Long-term Evolution (LTE) standard established by the 3rd Generation Partnership Project (3 GPP) organization, the direct communication link between a User Equipment (UE) to the UE is called a bypass (Sidelink, SL). Similar to the Uplink (DL) and Downlink (UL), there are also Control channels and data channels on the bypass, i.e., a Physical Downlink Control Channel (PSCCH) and a Physical Downlink Shared Channel (PSCCH). The PSSCH is used for carrying data, and the PSCCH is used for indicating information such as a time-frequency domain resource position, a modulation and coding mode and the like of PSSCH transmission.

The 3GPP LTE standard defines two different bypass communication mechanisms, including: a Device-to-Device (D2D) communication mechanism, and a V2X communication mechanism. Among them, V2X is superior to D2D in terms of data rate, delay, and reception reliability. Therefore, V2X has become the most representative bypass communication technology in the current 3GPP LTE standard.

The LTE V2X communication mechanism includes two resource allocation modes in total. One is a resource allocation Mode scheduled by a base station (evolved Node B, eNB), also called a centralized resource allocation Mode, i.e., Mode 3; the other is a resource allocation pattern that is selected autonomously by the UE, also referred to as a distributed resource allocation pattern, i.e., Mode 4. For Mode 3, the base station allocates a specific bypass resource location for sending V2X information in a resource pool to the UE through a Physical Downlink Control Channel (PDCCH), and Mode 3 minimizes mutual interference between bypass resources of different UEs through a reasonable base station scheduling policy. For Mode 4, the base station does not participate in the allocation of specific bypass resource positions, and the UE autonomously selects a bypass resource for sending V2X information from a bypass resource pool according to a resource selection condition.

In a New Radio (NR) system of 3GPP 5G, V2X is one of Work Items (WI) of the Rel-16 NR standard. Like LTE V2X, the NR V2X system also supports two resource allocation modes. One is a resource allocation Mode based on base station scheduling, i.e., Mode 1 of the NR V2X system corresponds to Mode 3 of the LTE V2X system; the other is a resource allocation Mode selected by the UE autonomously, i.e. Mode 2, and Mode 2 of the NR V2X system corresponds to Mode 4 of the LTE V2X system.

Compared to LTE V2X, the NR V2X system has higher traffic demand. The NR V2X system needs to support larger packet transmissions. Specifically, the typical packet size supported by the LTE V2X system is 300 bytes, while the NR V2X system needs to support the transmission of larger packets, e.g., the NR V2X packet size can reach several kilobytes.

To support larger packet transmission, the NR V2X system cannot reuse the resource allocation method of LTE V2X for a single slot, but needs to design a new resource allocation method for the NR V2X system. However, in the prior art, the details of the related art of the resource allocation method for the NR V2X system to support larger packets are not clear.

Disclosure of Invention

To overcome the above technical problems or at least partially solve the above technical problems, the present invention provides a resource allocation method for a bypass communication system, including the following technical solutions:

a method for bypassing transmissions is provided, the method comprising: user Equipment (UE) determines configuration parameters of aggregation time slot transmission; based on the configuration parameters, the UE determines an aggregated time slot resource; and the UE performs a physical bypass shared channel PSCCH transmission and a corresponding physical bypass control channel PSCCH transmission on the aggregated slot resources.

Optionally, performing the PSSCH transmission on PSSCH resources within the aggregated slot; or performing the PSSCH transmission on PSSCH resources in the aggregated slot and PSCCH resources in other aggregated slots except the first aggregated slot.

Optionally, for a case where the PSCCH transmission is performed on PSCCH resources within the aggregated slots, transmitting a PSCCH corresponding to the PSCCH on PSCCH resources within each of the aggregated slots; or sending the PSCCH corresponding to the PSSCH on the PSCCH resource in the first aggregation time slot in the aggregation time slots, wherein the PSCCH resources in other aggregation time slots except the first aggregation time slot are idle.

Optionally, for a case where the PSCCH transmission is performed on PSCCH resources within the aggregated slot and PSCCH resources within other aggregated slots than the first aggregated slot, a DMRS pattern for a demodulation reference signal of the PSCCH within the first aggregated slot is different from a DMRS pattern within the other aggregated slots than the first aggregated slot.

Optionally, where, for a case where the PSCCH transmission is performed on PSCCH resources in the aggregation slot and PSCCH resources in other aggregation slots except for the first aggregation slot, the transport block size of the psch is determined according to the number of resource elements used for psch mapping in the first aggregation slot; or determining the transport block size of the PSSCH according to the number of resource particles used for PSSCH mapping in other aggregation time slots except the first aggregation time slot; or the transport block size of the PSSCH is determined according to the total number of resource elements used for PSSCH mapping in all aggregated slots.

Optionally, the UE repeatedly transmits the psch within the aggregated slot.

Optionally, the same redundancy version is used in each of the aggregation slots repeatedly transmitting the psch; or the redundancy version used in each of the aggregated slots in which the PSSCH is repeatedly transmitted uses a predefined or preconfigured redundancy version cycle.

Optionally, wherein the same redundancy version is fixed for a case where the same redundancy version is used in each of the aggregated slots in which the psch is repeatedly transmitted; alternatively, the same redundancy version is indicated by the UE by bypassing the control information SCI.

Optionally, for a case where a predefined or preconfigured redundancy version cycle is used for the redundancy version used in each of the aggregated slots in which the psch is repeatedly transmitted, a starting redundancy version of the redundancy version cycle is fixed; alternatively, the starting redundancy version of the redundancy version cycle is indicated by the UE through the SCI.

Optionally, the UE transmits the psch in an overall rate-matched manner within the aggregated slot.

Optionally, the UE transmits the psch using a different analog beam within the aggregated slot.

Optionally, the aggregated time slots are logically contiguous.

Alternatively, the aggregated time slots may be logically discontinuous.

Optionally, the configuration parameters include an aggregated slot validation/revalidation identifier, a maximum number of aggregated slots, a number of aggregated slots, an RV cycle validation/revalidation identifier, an RV cycle, a threshold value of quality of service Qos for PSSCH used to decide whether to use aggregated slot transmission, at least one of a threshold value of a transport block size, TBS, for deciding on a psch transmitted using aggregated slots, a threshold value of a target communication distance for deciding on a psch transmitted using aggregated slots, a threshold value of a bypass channel quality for deciding on a transmitted using aggregated slots, a threshold value of a bypass power margin for deciding on a transmitted using aggregated slots, a threshold value of a reference signal received power, RSRP, for deciding on whether to exclude reserved aggregated slot resources from a set of candidate resources, and a threshold value of a priority for handling a psch where aggregated slot transmissions overlap with uplink transmissions.

Optionally, in case that the values of the aggregated slot validate/validate-invalidate identifier are validate and validate-invalidate, respectively, at least one of the following conditions is satisfied: the format of the SCI indicating the bypass resource for the psch transmission is different; in Mode 1 based on localized resource allocation, formats of downlink control information DCI for scheduling bypass resources for pscch transmission are different.

Optionally, based on the maximum number of polymerizable slots, the UE determines a set of numbers of polymerizable slots, and determines a size of a field in the SCI and/or in the DCI for scheduling bypass resources for indicating the number of polymerizable slots based on a set size of the numbers of polymerizable slots.

Optionally, the configuration parameter is pre-configured for at least one of a specific resource pool, a specific UE, a specific quality of service, a specific transport block size.

Optionally, the number of the starting slot of the psch transmission can be divided by the total number of slots of the aggregated slot.

Optionally, in Mode 2 based on distributed resource allocation, when the UE autonomously selects the bypass resource for psch transmission, the UE further includes: the UE preferentially selects the large block of bypass resources in the single time slot for the transmission of the PSSCH, and if the single time slot does not have enough bypass resources to be selected, the UE selects the bypass resources aggregated by the time slot for the transmission of the PSSCH; and/or the UE preferentially selects the bypass resources of the logically continuous time slot aggregation for one-time transmission of the data to be transmitted, if the bypass resources of the logically continuous time slot aggregation are not enough to be selected, the UE decomposes the data to be transmitted into a plurality of transmission blocks, and determines the bypass resources of the single time slot for the plurality of transmission blocks respectively.

Optionally, the UE determines whether to use aggregated slot resources for the psch transmission to be transmitted, a maximum number of aggregated slots, and/or a number of aggregated slots based on at least one of a quality of service and a transport block size of the psch.

Optionally, a threshold value of reference signal received power RSRP for excluding the reserved aggregated time slot resource and a threshold value of reference signal received power RSRP for excluding the reserved single time slot resource are preconfigured respectively.

Optionally, wherein the threshold value of the priority of the psch for handling uplink transmission overlapping with the single-slot bypass transmission and the threshold value of the priority of the psch for handling uplink transmission overlapping with the aggregate-slot bypass transmission are respectively preconfigured.

Optionally, when uplink transmission of the UE and bypass transmission of the aggregated slot overlap, if the priority of the bypass transmission is lower than the priority threshold of the psch for handling overlapping of uplink transmission and bypass transmission of the aggregated slot, discarding, by the UE, the bypass transmission, the discarding, by the UE, includes: discarding the bypass transmission on the time slot where the overlap occurs; or discarding the bypass transmission on all aggregated slots; or if the overlapped time slot is the first aggregation time slot, discarding the bypass transmission on all aggregation time slots; if the overlapping slot is not the first aggregated slot, the UE only discards the bypass transmission on the overlapping slot.

Optionally, the method further comprises: the UE receives feedback on the decoding results for the PSSCH on PSFCH resources corresponding to the PSSCH resources within the last of the aggregated slots.

Optionally, the UE receives ACK feedback for successful early decoding of the PSSCH on PSFCH resources corresponding to the PSSCH resources within one of the aggregation slots other than the last aggregation slot.

Optionally, the aggregation slots are logically discontinuous, and the UE receives ACK feedback for successful early decoding of the pschs in inter-slot intervals between the logically discontinuous aggregation slots.

Optionally, the total number of slots of the bypass resource selected by the UE at a time for psch transmission does not exceed a predefined or preconfigured threshold value.

Optionally, the method further comprises: and the UE reports auxiliary information used for deciding whether to use the aggregated time slot transmission and/or deciding the number of the aggregated time slots to the serving base station, wherein the auxiliary information comprises at least one of QoS (quality of service) of data to be transmitted, data volume to be transmitted, a target communication distance, a Channel Quality Indicator (CQI) of a bypass channel and bypass Power Headroom Reporting (PHR).

An apparatus for bypassing a transmission is provided, which performs the above method.

There is provided a computer device for bypass transmission comprising a memory, a processor, the memory having stored thereon instructions which, when executed by the processor, implement the above method.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 shows a flow chart of an example of a method for bypassing a transmission;

FIG. 2 shows a schematic diagram for a bypass occupancy mode;

FIG. 3 shows a schematic diagram of another approach for bypass occupancy;

fig. 4 shows a schematic diagram of PSFCH resources for receiving HARQ feedback in case a UE transmits a PSSCH over a plurality of aggregated slots that are logically consecutive;

fig. 5 shows a diagram of PSFCH resources for receiving HARQ feedback in case a UE transmits PSSCH over multiple aggregated slots that are logically discontinuous.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As will be appreciated by those skilled in the art, a "terminal" as used herein includes both devices having a wireless signal receiver, which are devices having only a wireless signal receiver without transmit capability, and devices having receive and transmit hardware, which have devices having receive and transmit hardware capable of two-way communication over a two-way communication link. Such a device may include: a cellular or other communication device having a single line display or a multi-line display or a cellular or other communication device without a multi-line display; PCS (Personal Communications Service), which may combine voice, data processing, facsimile and/or data communication capabilities; a PDA (Personal Digital Assistant), which may include a radio frequency receiver, a pager, internet/intranet access, a web browser, a notepad, a calendar and/or a GPS (Global Positioning System) receiver; a conventional laptop and/or palmtop computer or other device having and/or including a radio frequency receiver. As used herein, a "terminal" or "terminal device" may be portable, transportable, installed in a vehicle (aeronautical, maritime, and/or land-based), or situated and/or configured to operate locally and/or in a distributed fashion at any other location(s) on earth and/or in space. As used herein, a "terminal Device" may also be a communication terminal, a web terminal, a music/video playing terminal, such as a PDA, an MID (Mobile Internet Device) and/or a Mobile phone with music/video playing function, or a smart tv, a set-top box, etc.

Hereinafter, a UE for transmitting a bypass physical data channel is referred to as a transmitting UE, denoted as TX UE; the UE for receiving the bypass physical data channel is called the receiving UE, denoted RX UE. The TX UE transmits a Physical downlink Signal Channel (PSCCH) and a Physical downlink Control Channel (PSCCH) to the RX UE. The psch is used to carry bypass data, that is, used to carry a bypass Shared Channel (SL-SCH); the PSCCH is used to carry a Sidelink Control Information (SCI), that is, Information indicating a time-frequency domain resource location and a modulation and coding scheme for PSCCH transmission.

Hereinafter, a slot (slot) of the NR V2X system is a concept having the same physical meaning as a Subframe (Subframe) of the LTE V2X system. A slot is the smallest granularity of the NR V2X system psch resource allocation in the time domain, and one slot includes 14 Orthogonal Frequency-Division Multiplexing (OFDM) symbols.

With respect to time slot aggregation

Slot Aggregation (Slot Aggregation) is the Aggregation of two or more slots together for the transmission of one psch.

Optionally, the psch transmission will be performed using the same frequency domain resource within the multiple aggregation slots, i.e. the frequency domain resource indicated in the SCI is applicable to each aggregation slot.

Optionally, different frequency domain resources may be used for psch transmission within the multiple aggregated slots. In one example, there is no relationship between the frequency domain resources in different aggregation slots, the SCI needs to indicate a corresponding frequency domain resource for each aggregation slot resource, and when indicating the frequency domain resources, the starting positions of the frequency domain resources in other slots may be indicated by a relative offset of the starting position of the frequency domain resource in the first slot. In another example, there is a predefined mapping relationship between the frequency domain resources in different aggregation time slots, and the frequency domain resources in other time slots can be determined according to the mapping relationship and the frequency domain resources in the first time slot, i.e. the SCI only needs to indicate the frequency domain resources in the first aggregation time slot.

Alternatively, the multiple aggregated slots used for psch transmission may be logically contiguous, but may be physically non-contiguous. The logically contiguous refers to the aggregated plurality of time slots being contiguous from the perspective of a logical time slot, the logical time slot referring to a time slot configured for bypass transmission; the physically contiguous means that the aggregated plurality of time slots are contiguous from the perspective of physical time slots, including time slots configured for bypass transmission and time slots not configured for bypass transmission. For logically consecutive psch transmissions, the SCI only indicates the position of the starting aggregation slot and the number of aggregation slots, without indicating the positions of other aggregation slots. The logically continuous time slot aggregation helps to simplify the design of the system and reduce the signaling overhead for indicating the time domain bypass resource.

Alternatively, the multiple aggregated slots used for psch transmission may be logically discontinuous. For a logically discontinuous psch transmission, the SCI needs to indicate the position of each aggregated slot, e.g., the positions of other slots may be indicated at intervals from the position of the first slot, or at intervals from the position of the previous slot. The logically discontinuous time slot aggregation is beneficial to more flexibly allocating the bypass resources, and especially in the Mode 2 based on distributed resource allocation, a larger degree of freedom is provided for the UE to autonomously select the aggregation time slot resources, so that the opportunity of selecting the aggregation time slot resources is larger.

Transmission with time slot aggregation

Fig. 1 is a procedure for time slot aggregate transmission.

As shown in fig. 1, the timeslot aggregation transmission includes the following steps:

step 101: the TX UE determines configuration parameters of time slot aggregation transmission;

step 102: based on the configuration parameters, the TX UE determines aggregated time slot resources;

step 103: the TX UE performs a physical bypass shared channel PSCCH transmission and a corresponding physical bypass control channel PSCCH transmission on the determined aggregated slot resources.

The present invention is explained in the present specification with pre-configured higher-layer parameters as an example of the configuration parameters, but this is not to be construed as a restriction of other configuration parameters applicable to the present invention.

Pre-configured higher layer parameters for determining slotted aggregate transmissions in modes 1 and 2And when determining polymerization Manner of slot resource

(1) In the Mode 1 resource allocation Mode for allocating bypass resources based on the base station

In Mode 1 resource allocation Mode, the determining, by the TX UE, the pre-configured higher layer parameters for slotted aggregate transmission includes: the TX UE receives preconfigured high layer parameters for slot aggregation transmission from the base station based on UE specific RRC signaling.

In the Mode 1 resource allocation Mode, the determining, by the TX UE, the aggregated timeslot resources includes: the TX UE determines the aggregated slot resource based on DCI contained in the PDCCH received from the base station.

(2) In a Mode 2 resource allocation Mode based on UE autonomous selection of bypass resources

In the Mode 2 resource allocation Mode, if the TX UE is within the coverage of the cellular network, the determining, by the TX UE, the pre-configured higher layer parameters for timeslot aggregation transmission includes: the TX UE receives pre-configured high-level parameters of time slot aggregation transmission from a base station based on UE specific RRC signaling; if the TX UE is out of the coverage range of the cellular network, the TX UE determines the pre-configured high-layer parameters of the time slot aggregation transmission to comprise: the TX UE determines a pre-configured higher layer parameter for the time slot aggregate transmission based on the hard-coded bypass parameter.

In Mode 2 resource allocation Mode, the TX UE determining resources for an aggregated timeslot includes: the TX UE autonomously selects an aggregated time slot resource.

Adaptation and beneficial effects in modes 1 and 2 with respect to timeslot aggregation

One benefit of slot aggregation is to support transmission of larger TBSs, i.e., the purpose of slot aggregation is to aggregate more resources in the time domain to transmit larger TBSs at the target coding rate.

Psch transmission supporting a larger TBS through slot aggregation is applicable to Mode 2 based on distributed resource allocation and not applicable to Mode 1 based on localized resource allocation. This is because in Mode 1, the psch resource of the UE is allocated by the bs in a centralized manner, and the smart bs can allocate more resources in the frequency domain to support pscch transmission with a larger TBS without allocating more resources in the time domain by means of timeslot aggregation to support pscch transmission with a larger TBS, whereas in Mode 2, the UE autonomously selects the bypass resource by means of channel monitoring (transmitting), and thus there may not be enough resources in the frequency domain to support pscch transmission with a larger TBS, and only occupies more resources in the time domain by means of timeslot aggregation to support pscch transmission with a larger TBS.

Another benefit of slot aggregation is that larger Coverage (Coverage) is supported, mainly for transmit power limited scenarios, while the above-mentioned slot aggregation for supporting larger TBSs is suitable for transmit power unlimited scenarios. The limited transmission power means that the transmission power has reached the maximum allowable transmission power, more resources are added in the frequency domain, the transmission performance cannot be improved, and the signal energy can be accumulated in time only in a time slot aggregation manner to improve the received signal-to-noise ratio (SNR) at the RX UE end, so that the coverage area is enlarged. PSSCH transmission supporting a larger TBS through slot aggregation is applicable to both Mode 2 based on distributed resource allocation and Mode 1 based on localized resource allocation, and if the bypass channel quality is poor and the TX UE's transmit power is already limited, then slot aggregated PSSCH transmission may be enabled.

Resource occupation pattern for PSSCH actual transmission on aggregated slots

Fig. 2 and fig. 3 respectively show two different embodiments of the PSSCH transmission resource occupancy on the aggregation slot.

Similar solutions are described in the two embodiments shown in fig. 2 and 3 with respect to the composition of the aggregated time slot.

Each aggregated slot used for psch transmission should use the same frequency domain resources. In the V2X system, a Sub-channel (Sub-channel) is the smallest granularity of the psch resource allocation in the frequency domain. Each PSSCH sub-channel corresponds to a PSCCH resource, and the PSSCH sub-channel and the corresponding PSCCH resource are in the same time slot. In actual transmission, if the PSCCH resource contains only one PSCCH, the TX UE transmits a PSCCH corresponding to the PSCCH on one PSCCH resource corresponding to the one PSCCH subchannel; if the PSSCH resource includes multiple PSSCH subchannels, the TX UE transmits the PSCCH corresponding to the PSSCH only on one of multiple PSCCH resources corresponding to the multiple PSSCH subchannels. In one example, the other PSCCH resources of the plurality of PSCCH resources are used for transmission of the PSCCH, i.e. the PSCCH is mapped to the plurality of PSCCH subchannels and to PSCCH resources other than those used for PSCCH transmission of the plurality of PSCCH resources, in another example, the other PSCCH resources of the plurality of PSCCH resources are free.

As shown in fig. 2 and 3, four logically consecutive slots are grouped together for transmission of one pscch as an example. Wherein each time slot comprises:

the first OFDM symbol is used for Automatic Gain Control (AGC). Specifically, the TX UE transmits a signal with the same PSSCH transmission power in the present time slot at the AGC symbol, the specific transmitted signal depends on the implementation of the UE, and the RX UE adjusts the AGC threshold according to the energy of the received signal at the AGC symbol;

the last OFDM symbol is used for the Guard Period (GP). In particular, there is no transmission of any signal at the GP symbol;

-PSCCH resources; and

-PSCCH resources corresponding to the PSCCH resources.

Regarding the manner of occupying the psch transmission resource, two alternative solutions are described in the two embodiments shown in fig. 2 and 3.

In one embodiment, as shown in fig. 2, the TX UE performs pscch transmission on pscch resources within each aggregation slot, i.e., the actual transmission of the pscch occupies the pscch resources within each aggregation slot.

Optionally, the TX UE transmits the PSCCH corresponding to the PSCCH on a corresponding PSCCH resource within each of the plurality of aggregated time slots.

In one example, the number of aggregation slots used for PSCCH transmission is indicated by SCI, and the number of aggregation slots indicated by PSCCH corresponding to PSCCH transmitted in each slot should be different, for example, the number of aggregation slots indicated by PSCCH corresponding to PSCCH transmitted in the first slot in fig. 2 is 4, the number of aggregation slots indicated by PSCCH corresponding to PSCCH transmitted in the second slot is 3, the number of aggregation slots indicated by PSCCH corresponding to PSCCH transmitted in the third slot is 2, and the number of aggregation slots indicated by PSCCH corresponding to PSCCH transmitted in four slots is 1, that is, the number of aggregation slots indicated by PSCCH corresponding to PSCCH transmitted in each aggregation slot is the number including the current slot and the following slots, excluding the number of previous slots. This has the advantage that the RX UE can still receive the pscch transmission of the following partial aggregation slot even if it loses the pscch transmission of the preceding partial aggregation slot due to half-duplex effects.

Optionally, the information indicated by the PSCCH corresponding to the PSCCH transmitted in each slot is identical except for the difference in the number of aggregated slots indicated in the SCI.

If the pschs are transmitted on aggregated slots in a repeated transmission manner as described below, the RV indicated by the PSCCH corresponding to the pschs transmitted in each aggregated slot may be different and the indicated RV is only used for the pschs transmitted in the current slot. Optionally, other information indicated by the PSCCH corresponding to the psch transmitted in each slot is identical except that the RV indicated in the SCI is different and the number of aggregation slots indicated in the SCI is different.

In another example, the number of aggregated slots used for psch transmission is semi-statically preconfigured by a higher layer parameter, and the PSCCH corresponding to the psch transmitted in each slot may indicate the position of the current slot in multiple aggregated slots, e.g., the PSCCH corresponding to the psch transmitted in the first slot in fig. 2 indicates that the current slot is 1 st of the multiple aggregated slots, the PSCCH corresponding to the psch transmitted in the second slot indicates that the current slot is 2 nd of the multiple aggregated slots, the PSCCH corresponding to the psch transmitted in the third slot indicates that the current slot is 3rd of the multiple aggregated slots, and the PSCCH corresponding to the psch transmitted in the four slots indicates that the current slot is 4 th of the multiple aggregated slots. This has the advantage that the RX UE can still receive the pscch transmission of the following partial aggregation slot even if it loses the pscch transmission of the preceding partial aggregation slot due to half-duplex effects.

Optionally, the other information indicated by the PSCCH corresponding to the PSCCH transmitted in each slot is identical except that the current slot indicated in the SCI is located at a different position in the aggregated slots.

If the pschs are transmitted on aggregated slots in a repeated transmission manner as described below, the RV indicated by the PSCCH corresponding to the pschs transmitted in each aggregated slot may be different and the indicated RV is only used for the pschs transmitted in the current slot. Optionally, other information indicated by the PSCCH corresponding to the PSCCH transmitted in each slot is identical except that the RV indicated in the SCI is different and the position of the current slot indicated in the SCI in the multiple aggregated slots is different.

Optionally, the TX UE transmits the PSCCH corresponding to the PSCCH only on the corresponding PSCCH resource in the first slot of the multiple aggregated slots, and the corresponding PSCCH resources in other slots are idle.

Particularly, when the PSCCH resource includes a plurality of PSCCH subchannels in the frequency domain, the TX UE transmits the PSCCH corresponding to the PSCCH only on one PSCCH resource of a plurality of PSCCH resources corresponding to the PSCCH subchannels, where other PSCCH resources of the PSCCH resources are used for PSCCH transmission, and the PSCCH resource occupation manner is specifically that the TX UE performs PSCCH transmission on the PSCCH resource in each aggregation slot and on PSCCH resources other than PSCCH resources used for PSCCH transmission among the PSCCH resources in each aggregation slot, that is, actual transmission of the PSCCH occupies the PSCCH resources in each aggregation slot and other PSCCH resources except for PSCCH transmission among the PSCCH resources in each aggregation slot.

The above PSSCH resource occupation method based on slot aggregation is helpful to support a larger coverage area, and is suitable for the PSSCH transmission based on repetition mode transmission and the PSSCH transmission based on beam scanning mode transmission described below. This is because supporting a larger coverage includes supporting a larger PSCCH coverage as well as a larger PSCCH coverage, as with the transmission of pschs, the PSCCH resources of other aggregated slots than the first aggregated slot also apply to the transmission of the PSCCH.

In another embodiment, as shown in fig. 3, the TX UE performs PSCCH transmissions on PSCCH resources within each aggregation slot and corresponding PSCCH resources within other aggregation slots than the first aggregation slot, i.e. the actual transmission of the PSCCH occupies the PSCCH resources within each aggregation slot and the corresponding PSCCH resources within other aggregation slots than the first aggregation slot. The TX UE transmits the PSCCH corresponding to the PSCCH only on the corresponding PSCCH resource within the first aggregated slot. That is, the transmission of the PSCCH is performed on the PSCCH resources only in the first aggregated slot, and on the PSCCH resources and corresponding PSCCH resources in other aggregated slots.

Particularly, when the PSCCH resource includes a plurality of PSCCH subchannels in the frequency domain, the TX UE transmits the PSCCH corresponding to the PSCCH only on one PSCCH resource of the PSCCH resources corresponding to the PSCCH subchannels, and other PSCCH resources of the PSCCH resources are also used for PSCCH transmission, and the PSCCH resource occupation manner is specifically that the TX UE performs PSCCH transmission on the PSCCH resource in each aggregation slot, other PSCCH resources used for PSCCH transmission in the PSCCH resources in the first aggregation slot, and the PSCCH resource occupation manner in each PSCCH resource in other aggregation slots, that is, actual transmission of the PSCCH occupies the PSCCH resource in each aggregation slot, other PSCCH resources used for PSCCH transmission in the PSCCH resources in the first aggregation slot, and the each PSCCH resource in other aggregation slots.

The above PSSCH resource occupation method for slot aggregation helps to support a larger TBS, and is suitable for the PSSCH transmission based on the overall rate matching method described below. This is because supporting a larger TBS only requires more resources to be allocated for the PSCCH containing a larger amount of data, and no more resources need to be allocated for the PSCCH carrying a SCI of fixed load size, so PSCCH resources on aggregation slots other than the first aggregation slot can be used for PSCCH transmission.

Optionally, a psch Demodulation Reference Signal (DMRS) pattern in the first aggregation slot is the same as the other aggregation slots. Specifically, in the first aggregated Slot #1 and the other aggregated slots Slot #2-4, PSSCH DMRS transmission is only on OFDM symbols of the PSSCH resource.

Optionally, a psch Demodulation Reference Signal (DMRS) pattern in the first aggregation slot is different from other aggregation slots. Specifically, in the first aggregated Slot #1, PSSCH DMRS transmission is performed on OFDM symbols of the PSSCH resource; in other aggregation slots Slot #2-4, PSSCH DMRS may be performed on OFDM symbols of the PSCCH resource in addition to OFDM symbols of the PSCCH resource.

The PSSCH DMRS pattern in the first aggregated slot, different from the PSSCH DMRS pattern in other aggregated slots, can help to adaptively change the position and density of PSSCH DMRS symbols according to the change of the number of OFDM symbols occupied by the psch within the slot, so as to improve the channel estimation accuracy and thus improve the decoding performance of the psch.

PSSCH transmission on aggregated slots

Embodiments are described below with respect to three different pscch transmissions on an aggregated slot.

(1) Repetitive transmission mode

In one embodiment, the PSSCH transmission is performed using a repeated transmission scheme on the aggregate slot. Specifically, the TX UE transmits the pscch in a repeated transmission manner within a plurality of aggregated slots.

The repeated transmission mode helps to improve the decoding performance of the PSSCH transmission in an energy accumulation mode, so that a larger coverage area is supported, namely, the repeated transmission mode is suitable for time slot aggregation which is used for supporting the larger coverage area when the transmission power is limited. This is because a higher number of repetitions can improve the SNR more than a lower channel coding rate when the transmit power is limited.

The aggregation of slots using a repetitive transmission scheme may also be referred to as "Slot Bundling" or "Slot Repetition".

(1.1) resource occupation mode of PSSCH actual transmission

Alternatively, the repeated transmission scheme may be applied to the psch resource occupancy scheme shown in fig. 2, i.e., the TX UE performs psch transmission on psch resources within multiple aggregated slots. This manner of resource occupancy is referred to herein as a "first manner of resource occupancy".

Alternatively, the repeated transmission scheme may be applied to the psch resource occupancy scheme shown in fig. 3, i.e., transmission of the psch is performed only on psch resources in the first aggregation slot, while transmission of the psch is performed on psch resources as well as PSCCH resources in other aggregation slots. This manner of resource occupancy is referred to herein as a "second manner of resource occupancy".

(1.2) determination of Transport Block Size (TBS)

For the first Resource occupation manner, in each aggregation time slot, the number of Resource Elements (REs) occupied by PSSCH transmission is the same, and the TX UE determines the TBS according to the total number of REs occupied in any one of the multiple aggregation time slots.

For the second resource occupation manner, the number of REs occupied by the psch transmission in the first aggregation slot is different from that in other aggregation slots, and the number of REs included in other aggregation slots except the first aggregation slot for mapping the psch data symbols is greater than the number of REs included in the first aggregation slot for mapping the psch data symbols. Therefore, the TBS may be determined based on the total number of REs occupied in the first aggregation slot, or may be determined based on the total number of REs occupied in any one of the other aggregation slots. Correspondingly, rate matching may be performed based on the total number of REs occupied in the first aggregation time slot, or rate matching may be performed based on the total number of REs occupied in any one of the other aggregation time slots.

Alternatively, the TX UE determines the TBS for the pscch transmission based on the larger number of REs (i.e., the number of REs included in any of the other aggregation slots except the first aggregation slot for mapping the pscch data symbols), and performs rate matching based on the larger number of REs. When the rate-matched PSSCH data symbols are mapped to the first aggregation slot, excess data symbols are discarded to accommodate the size of PSSCH resources in the first aggregation slot. For example, the data symbols of the last part of the PSCCH to be transmitted may be discarded, or the data symbols within other aggregated slots that should be mapped onto PSCCH resources in the first aggregated slot may be discarded.

Optionally, the TX UE determines the TBS for the pscch transmission based on the smaller number of REs (i.e., the number of REs included in the first aggregation slot used to map the pscch data symbols) and performs rate matching based on the smaller number of REs. When the PSSCH data symbol after rate matching is mapped to the aggregation time slot of the PSSCH, repeated mapping is carried out on a part of the PSSCH data symbol on redundant REs on other aggregation time slots so as to adapt to the size of PSSCH resources in other aggregation time slots. For example, when the data symbols of the psch are mapped, the mapping is restarted from the first psch data symbol on the remaining REs.

(1.2) determination of redundancy Version (Redundant Version, RV)

Optionally, the same RV is used in multiple aggregation slots where the psch is repeatedly transmitted. Specifically, the psch defaults to using repeated transmissions with RV of 0 in multiple aggregation slots, or the TX UE indicates in the SCI a specific RV used in the multiple aggregation slots. Based on the characteristic that signals transmitted on the same RE in the multiple aggregation time slots are the same by using the same RV, the RX UE can obtain the phase difference of the signals received on the same RE in the multiple aggregation time slots, estimate the Doppler frequency offset based on the phase difference, and improve the accuracy of channel estimation based on the estimation result, thereby improving the decoding performance of PSSCH transmission.

For the above-mentioned manner of using the same RV in multiple aggregation slots for repeatedly transmitting PSSCH, the same RV may be fixed or may be indicated by TX UE through SCI.

Using the same RV, which is fixed, helps to reduce signaling overhead. While the same RV indicated by the SCI facilitates flexibility of transmission, e.g., the RV used at psch retransmission may be different from the RV used at psch initial transmission.

Optionally, different RVs are used in multiple aggregation slots where the pschs are repeatedly transmitted, i.e., different RVs are used in turn over the multiple aggregation slots in a predefined order. This approach may be referred to as "redundancy version Cycling" (RV Cycling). The RV Cycling has the advantage that soft bit combination of different redundancy versions can be obtained, so that channel coding gain is improved, and the decoding performance of PSSCH is improved.

For the manner of RV Cycling, the TX UE may obtain a predefined or preconfigured RV Cycling order. Alternatively, the RV Cycling order may be only one, e.g., 0231. Alternatively, the RV Cycling order may be multiple, for example, 0231, 0022, 0000, or the like. Optionally, both TX UE and RX UE determine RV Cycling order through pre-configured high-level parameters; optionally, the TX UE dynamically determines an RV Cycling order and indicates the used RV Cycling order in the SCI, in Mode 1, the TX UE determines the RV Cycling order by receiving a PDCCH for bypass resource scheduling sent by the base station, and in Mode 2, the TX UE autonomously determines the RV Cycling order.

Further, the manner in which RV Cycling is effected (enabled) or de-effected (disabled) may be preconfigured. Specifically, when the value of the validate/invalidate identifier is disable, the same RV is used in multiple aggregation slots for repeatedly transmitting PSSCH, optionally, the same RV defaults to 0, or optionally, the same RV is indicated by TX UE through SCI; the predefined or preconfigured RV Cycling order is only validated when the validation/decommissioning identifier has a value of enable.

Further, when the TX UE obtains a specific set of RV Cycling orders (e.g., 0231) and the validation/decommissioning identifier has an enable value, it is also necessary to determine the cycle start RV information, i.e., determine the RV of the first aggregation slot. For determining the cycle start RV information, optionally, the default RV Cycling is first bit from the start of the first aggregated slot cycle. For example, for the RV Cycling order 0231, the RV on the first aggregated slot defaults to using the first bit of the RV Cycling order, i.e., 0. The RVs on other aggregation slots continue Cycling from the second bit (i.e., 2) of the RV Cycling. In the default mode, an indication field for RV in SCI may be reserved or used to indicate other information, e.g., to indicate the number of aggregation slots. Alternatively, RV Cycling may be indicated by SCI at the start of the first aggregated slot cycle. For example, the RV on the first aggregation slot may be instructed to use the third bit of the RV Cycling order, i.e., 3. The RVs on other aggregation slots will cycle according to the RV Cycling order from the next bit (i.e., the fourth bit, 1) of the designated location.

The use of a fixed starting RV for RV Cycling helps to reduce signaling overhead. While the starting RV of the RV Cycling indicated by the SCI contributes to the flexibility of transmission, for example, the starting RV of the RV Cycling used at the PSSCH retransmission may be different from the starting RV of the RV Cycling used at the PSSCH initial transmission.

(2) Overall rate matching mode

In another embodiment, PSSCH transmission is performed using an overall rate matching scheme on the aggregate slot. In particular, the TX UE continuously maps data symbols of different parts of one and the same psch in multiple aggregated slots.

The overall rate-matched transmission scheme helps to reduce the channel coding rate to support a larger TBS. That is, the overall rate-matched transmission scheme is suitable for timeslot aggregation for supporting larger TBSs when the transmit power is not limited.

(2.1) resource occupation mode of PSSCH actual transmission

Optionally, the overall rate matching transmission mode may be applied to the first resource occupation mode.

Optionally, the overall rate matching transmission mode may be applied to the second resource occupation mode.

(2.2) determination of Transport Block Size (TBS)

For the above two resource occupying manners, the TX UE determines the TBS according to the total number of REs included in all aggregation slots for mapping the pschs data symbols, and performs rate matching according to the total number of REs.

(3) Beam scanning (Beam scanning) mode

In another embodiment, the PSSCH transmission is performed using a beam-scanning scheme on the aggregated slot. Specifically, the TX UE transmits the PSCCH using different beams in multiple aggregated slots and transmits the corresponding PSCCH using different beams in multiple aggregated slots, and the PSCCH and its corresponding PSCCH within the same slot use the same beam. The beams are analog beams.

The beam scanning transmission mode realizes omnidirectional coverage through alternate directional transmission, so that the PSSCH transmitted by the TX UE is received and decoded by the RX UE in more directions, especially under the scenes of higher frequency points and larger attenuation. The beam scanning transmission mode is suitable for broadcast and multicast PSSCH, not for unicast PSSCH.

Here, the slot aggregation of the psch transmission is relative to the TX UE, but the psch received by the RX UE is still a single slot transmission relative to the RX UE, i.e. the RX UE only receives the psch on the slot in the beam direction in which it is located.

Furthermore, the aggregated time slots for beam sweep transmissions need not be logically contiguous, i.e., multiple aggregated time slots may be logically non-contiguous.

(3.1) resource occupation mode of PSSCH actual transmission

The beam scanning mode is applied to the first resource occupying mode.

(3.2) determination of Transport Block Size (TBS)

The TBS is determined by the number of REs included in any one of the plurality of slots for mapping the pscch data symbols.

Higher layer parameters for pre-configuration

(1) Validate/invalidate identifier for aggregated slots

The validate/invalidate identifier may be pre-configured for an identifier that indicates whether to validate the aggregated slot.

Optionally, the TX UE uses a different SCI format in the transmitted PSCCH when the aggregated time slot is pre-configured to be valid and pre-configured to be de-valid. For example, the SCI format used by the PSCCH when the aggregated slot is preconfigured to be valid also contains a field indicating the number or specific location of aggregated slots compared to the SCI format used by the PSCCH when the aggregated slot is preconfigured to be de-valid.

Alternatively, in Mode 1 based on localized resource allocation, the PDCCH for bypassing resource scheduling should use different DCI formats when the aggregated slot is pre-configured to be valid and when it is pre-configured to be de-valid. For example, the DCI format used by the PDCCH when the aggregation slot is preconfigured to be valid also contains a field indicating the number or location of aggregated slots compared to the DCI format used by the PDCCH when the aggregation slot is preconfigured to be de-valid.

The technical scheme that the SCI format and the DCI format are different under the scene that the value of the aggregation time slot validation/invalidation identifier is validated and invalidated respectively increases the flexibility of system configuration and reduces the control signaling overhead.

(2) Maximum number of time slots that can be aggregated

For the maximum number of polymerisable time slots, optionally, the maximum number of polymerisable time slots may be predefined. Alternatively, the maximum number of aggregatable time slots may be semi-statically preconfigured. When the maximum number of aggregated slots is preconfigured to 1, it indicates that the resource allocation method for slot aggregation is not in effect (disable). That is, the enable or disable of the aggregated slot may be indirectly indicated by the maximum number of aggregated slots.

In addition, the system also has a specification on the number of the polymerizable time slots. For example, a table is predefined for the number of polymerizable timeslots by the system indicating the number of polymerizable timeslots at a certain maximum number of polymerized timeslots, i.e. the TX UE may determine the number of polymerizable timeslots according to this predefined table and the preconfigured maximum number of polymerized timeslots. An example is given in table 1.

TABLE 1 number of time slots that can be aggregated

Maximum number of time slots that can be aggregated	Number of time slots that can be aggregated
		2	1 2
4	1 2 4
		8	1 2 4 8
16	2 4 8 16

If the number of the aggregation-enabled slots has a value of 2 or more, the TX UE can indicate the number of the aggregation-enabled slots through the SCI. That is, the number of slots aggregated for psch transmission is indicated by the SCI. That is, the SCI indicates, in addition to the frequency domain resource allocation (i.e., subchannel location and number) for the psch transmission, the time domain resource allocation (i.e., starting slot location and number of occupied logically contiguous slots) for the psch transmission.

Alternatively, the maximum number of aggregated slots indirectly determines the size of the field in the SCI that indicates the number of aggregated slots. This is because the maximum number of aggregated slots determines the set of number of aggregated slots, and the size of the field in the SCI indicating the number of aggregated slots may be determined by the size of the set of number of aggregated slots. For example, when the set of the number of aggregation slots has 4 values, 2 bits may be used in the SCI to indicate the number of aggregation slots; when the set of the number of aggregation slots has 2 values, 1 bit may be used in the SCI to indicate the number of aggregation slots.

Alternatively, in Mode 1 based on localized resource allocation, the maximum number of aggregated slots indirectly determines the size of the field indicating the number of aggregated slots in DCI for bypass resource scheduling. This is because the maximum number of aggregated slots determines the set of the number of aggregated slots, and the size of the field indicating the number of aggregated slots in DCI for bypass resource scheduling may be determined by the size of the set of the number of aggregated slots. For example, when the set of the number of polymerizable slots has 4 values, 2 bits may be used in DCI for bypass resource scheduling to indicate the number of polymerizable slots; when the set of the number of the polymerizable slots has 2 values, 1 bit may be used in DCI for bypass resource scheduling to indicate the number of the polymerizable slots.

In summary, based on the maximum number of polymerizable slots, the TX UE determines a set of numbers of polymerizable slots, and determines a size of a field indicating the number of polymerizable slots in the SCI and/or in the DCI for scheduling bypass resources based on a set size of the numbers of polymerizable slots. The technical scheme increases the flexibility of system configuration and reduces the control signaling overhead.

(3) Number of aggregated slots

The number of aggregated slots may optionally be predefined for the number of aggregated slots. Alternatively, the number of aggregated time slots may be semi-statically preconfigured. When the number of the aggregated time slots is preconfigured to be 1, it indicates that the resource allocation method of the time slot aggregation is not in effect. That is, the enable or disable of the aggregated slot may be indirectly indicated by the number of aggregated slots. If the TX UE is in the coverage range of the cellular network, the serving base station pre-configures the parameters through UE Specific RRC signaling; if the UE is out of the coverage area of the cellular network, the parameters are pre-configured in a hard coding mode.

In one embodiment, the system pre-configures the three slot aggregation parameters described above for a particular resource pool. For example, the value of the slot aggregation validation/decommissioning identifier for some resource pools is enable and the value of the slot aggregation validation/decommissioning identifier for some resource pools is disable, the maximum number of aggregated slots for different resource pools may be different, or the number of aggregated slots for different resource pools may be different.

In another embodiment, the system pre-configures the three slot aggregation parameters for a particular UE. For example, the value of the slot aggregation validation/decommissioning identifier of some UEs is enable, and the value of the slot aggregation validation/decommissioning identifier of some UEs is disable, the maximum number of polymerizable slots of different UEs may be different, or the number of aggregated slots of different UEs may be different.

In another embodiment, the system predefines or pre-configures the three slot aggregation parameters for a particular Quality of Service (QoS) and/or transport block size (QoS). For example, for a PSSCH of higher QoS, the value of the slot aggregation validate/validate identifier is enable, while for a PSSCH of lower QoS, the value of the slot aggregation validate/validate identifier is disable, and for PSSCHs of different QoS, the maximum number of polymerizable slots of an aggregated slot, and the number of aggregated slots may be different. The QoS may be indicated by psch Priority (Priority) information in the SCI. As another example, for the pschs of larger TBSs, the value of the slot aggregation validate/validate identifier is enable, while for the pschs of smaller TBSs, the value of the slot aggregation validate/validate identifier is disable, and for the aggregation slots of the pschs of different TBSs, the maximum number of polymerizable slots, and the number of aggregated slots may be different. That is, in this example, the use condition of slot aggregation is to have a higher QoS and/or to have a larger TBS.

In summary, the preconfigured high layer parameters are preconfigured for at least one of a specific resource pool, a specific UE, a specific quality of service, a specific transport block size. Such a solution may be advantageous. In particular, it increases the adaptability of the system pre-configuration parameters to specific requirements.

Criterion for starting slot position of aggregated slots

The system numbers the slots configured for bypass transmission, and the number (index) of the starting slot for bypass transmission among the N aggregation slots must satisfy the following condition:

index% N is 0 (formula 1)

As shown in equation 1, only the slot whose number is divisible by N can be used as the starting slot of the N aggregation slots.

For example, assuming that the number N of aggregated slots is 4, for the slot numbered 0,4,8 configured for bypass transmission, it may be the starting slot; and for a slot whose number cannot be divided by 4, for example, a slot whose number is 1,2,3,5, 6,7, it cannot be used as the starting slot. It is noted that the numbering is of logical slots, not physical slots.

In Mode 2 based on distributed resource allocation, the UE should follow the above rules when autonomously selecting the bypass resource. The rule can align the time slot aggregation resources autonomously selected by different UEs on the same resource pool, thereby reducing the probability of resource fragmentation.

Details regarding slotted aggregate transmission in Mode 2

(1) Selection of single slot transmission or slot aggregation transmission based on UE Implementation (Implementation)

In one embodiment, in Mode 2 based on distributed resource allocation, the TX UE may autonomously select whether to use slot aggregation based on the UE implementation, i.e., the TX UE may autonomously select a bypass resource within one slot, or a bypass resource within an aggregated slot, for transmission of the psch based on the UE implementation. For example, when there are two alternative resource allocation schemes, multiple subchannels in a slot, and one subchannel over multiple aggregated slots, the TX UE may select one of the subchannels for a primary transmission of the psch based on the UE implementation.

(2) Selecting single-slot transmission or slot aggregate transmission based on predefined priority

In another embodiment, in Mode 2 based on distributed resource allocation, the TX UE may select whether to use the single-slot bypass resource or the slot aggregation bypass resource for transmitting the pscch based on the priority of the single-slot transmission and the slot aggregation transmission.

Alternatively, selecting a bypass resource within a slot may have a higher priority than selecting a bypass resource within an aggregated slot. In the selectable resource set, when there are two selectable resource allocation schemes, i.e., a plurality of subchannels of a timeslot and a subchannel over a plurality of aggregated timeslots, the TX UE preferentially selects the former resource allocation scheme. That is, the TX UE uses the bypass resource in the aggregated slot only if there are not enough subchannels in a slot for transmission of the pscch carrying the target TBS in order to use more bypass resources for transmission of the pscch carrying the target TBS.

Optionally, selecting a bypass resource within an aggregated time slot may have a higher priority than selecting a bypass resource within a time slot. In the selectable resource set, when there are two selectable resource allocation schemes, i.e., a plurality of subchannels of a timeslot and aggregation of a subchannel over a plurality of timeslots, the TX UE preferentially selects the latter resource allocation scheme. That is, the UE selects the bypass resource within a single slot only if there are not enough multiple logically contiguous slots of the same subchannel to aggregate for transmission of the pschs carrying the target TBS.

(3) Selecting a single-TB or multi-TB aggregated transmission based on predefined priorities

In another embodiment, in Mode 2 based on distributed resource allocation, the TX UE may select the time-slot aggregated bypass resource for transmission of one large TBs or multiple single-slot bypass resources for transmission of multiple small TBSs based on the priority of single TB transmission and multiple TB transmission.

Optionally, selecting the bypass resources for slot aggregation for transmission of one large TBS has a higher priority than selecting the bypass resources for multiple single slots for transmission of multiple small TBSs. That is, when the UE autonomously selects the bypass resource, if the amount of data to be transmitted by the UE is large, the UE preferentially completes one transmission of the data to be transmitted in a time slot aggregation manner, that is, single TB transmission, and in the candidate resource set, if there is no continuous multiple time slots in the time domain to bear the amount of data to be transmitted in an aggregation manner, the UE may divide the data to be transmitted into 2 or more small TBs for transmission, that is, multiple TB transmission, and the UE may respectively select the bypass resource in different time slots for the small TBSs, where the time slots may be discrete, and each small TBs uses the bypass resource in a single time slot for transmission.

In short, the UE preferentially selects the large block bypass resource in the single time slot for the transmission of the PSSCH, and if the large block bypass resource is not enough selectable in the single time slot, the UE selects the bypass resource aggregated by the time slot for the transmission of the PSSCH; and/or the UE preferentially selects the bypass resources of the logically continuous time slot aggregation for one-time transmission of the data to be transmitted, if the bypass resources of the logically continuous time slot aggregation are not selectable, the UE decomposes the data to be transmitted into a plurality of transmission blocks, and determines the bypass resources of the single time slot for the plurality of transmission blocks respectively.

Such a solution may be advantageous. Specifically, the preferential selection of the large block bypass resource of the single time slot can avoid the deterioration of half-duplex influence brought by time slot aggregation transmission, and the preferential selection of the bypass resource of the time slot aggregation to support the transmission of the large TBS can improve the transmission delay of the service and improve the service quality.

(4) Determining whether to use slot aggregation transmission based on at least one of QoS, TBS, target communication distance, bypass channel quality, bypass power headroom of PSSCH

In another embodiment, in Mode 2 based on distributed resource allocation, the TX UE determines whether to use slot aggregation according to at least one of QoS, TBS, target communication distance, bypass channel quality, bypass power headroom of the psch to be transmitted.

Optionally, the TX UE autonomously selects the timeslot-aggregated bypass resource for psch transmission when the amount of data of the psch to be transmitted is large, i.e. the target TBS value is larger than a predefined or preconfigured threshold value. That is, slot aggregation is only used for transmission of the pschs for larger TBSs.

Optionally, the TX UE autonomously selects the bypass resource of the slot aggregation for psch transmission when the QoS of the PDSSCH to be transmitted is high, e.g., the value of the priority of the psch is less than a predefined or preconfigured threshold value. That is, the slot aggregation is only used for transmission of the PSSCH of higher QoS, and the parameter characterizing QoS may be the priority of the PSSCH as indicated in the SCI.

Optionally, when the data amount of the psch to be transmitted is large and the QoS of the data to be transmitted is high, that is, the target TBS is greater than a predefined or preconfigured threshold value, and the value of the traffic priority is less than the predefined or preconfigured threshold value, the TX UE autonomously selects the bypass resource of the slot aggregation for the psch transmission, that is, the slot aggregation is only used for the transmission of the large TBS and the psch of the higher QoS.

Optionally, when the target communication distance of the data to be transmitted is larger, that is, the target communication distance is larger than a predefined or preconfigured threshold value, the TX UE autonomously selects the timeslot-aggregated bypass resource for psch transmission. That is, the slot aggregation is only used for the case of a large target communication distance.

Optionally, when the quality of the bypass channel of the target RX UE is poor, e.g., the CQI value of the target channel is less than a predefined or preconfigured threshold value, the TX UE autonomously selects the slot aggregated bypass resource for psch transmission. That is, the slot aggregation is only used for the case where the quality of the poor bypass channel is poor, and the parameter characterizing the quality of the bypass channel may be CQI.

Optionally, the TX UE autonomously selects the slot-aggregated bypass resource for psch transmission when the TX UE's bypass power margin is small, e.g., when the value of the TX UE's bypass power margin is less than a predefined or preconfigured threshold value. That is, the slot aggregation is only used for the case where the bypass power margin is small.

(5) Determining a number of aggregated slots based on at least one of QoS, TBS, target communication distance, bypass channel quality, bypass power headroom of PSSCH

In one embodiment, in Mode 2 based on distributed resource allocation, when the TX UE autonomously selects an aggregated slot for pscch transmission based on the above resource usage condition, the TX UE may determine the number of aggregated slots according to at least one of QoS, TBS, target communication distance, bypass channel quality, bypass power headroom of the pscch to be transmitted.

Alternatively, TBSs in different ranges may correspond to different numbers of aggregated slots, or a maximum number of aggregated slots. When the target TBS is within a predefined or preconfigured range, the TX UE may autonomously select a bypass resource for the corresponding number of aggregated slots for pscch transmission.

Alternatively, QoS in different ranges may correspond to different numbers of aggregated slots, or a maximum number of aggregated slots). When the target traffic priority is within a predefined or preconfigured range, the TX UE may autonomously select a corresponding aggregated number of slots of the bypass resource for psch transmission.

Optionally, target communication distances, bypass channel quality, and/or bypass power headroom at different ranges may correspond to different numbers of aggregated slots, or maximum number of aggregated slots. When the target communication distance, bypass channel quality, and/or bypass power headroom is within a predefined or preconfigured range, the TX UE may autonomously select a bypass resource for the corresponding aggregated number of slots for psch transmission.

In summary, the TX UE determines whether to use multiple aggregated slot resources for the pscch transmission, a maximum number of aggregated slots, and/or a number of aggregated slots based on at least one of QoS, TBS, target communication distance, bypass channel quality, bypass power headroom of the pscch to be transmitted.

The above solution may be advantageous. Specifically, the method determines the appropriate transmission resource according to the service quality of the PSSCH to be transmitted and the size of the transmission block, thereby increasing the flexibility and adaptability of system resource allocation and improving the use efficiency of the resource.

(5) Single-slot transmission and slot aggregation transmission use different Reference Signal Received Power (RSRP) thresholds for resource exclusion

In one embodiment, in Mode 2 based on distributed resource allocation, the TX UE excludes the reserved resources indicated in its previously received and decoded SCI from the target resource pool when the UE autonomously selects the bypass resource. When the TX UE autonomously selects a single time slot for PSSCH transmission based on the resource use condition, the excluded reserved resource is a bypass resource in the single time slot; when the TX UE autonomously selects an aggregation slot for psch transmission based on the above-mentioned resource usage conditions, the excluded reserved resource is a bypass resource within the aggregation slot.

Optionally, different RSRP thresholds may be used to exclude the two reserved resources. For example, RSRP thresholds for reserved resources excluding aggregated time slots and RSRP thresholds for reserved resources excluding single time slots may be preconfigured separately. For another example, there is a predefined or preconfigured difference between the two RSRP threshold values, e.g., the predefined or preconfigured RSRP threshold value for excluding reserved resources for aggregated time slots is 3dB higher than the RSRP threshold value for excluding reserved resources for single time slots.

The respective configurations of the RSRP threshold for excluding reserved resources of aggregated time slots and the RSRP threshold for excluding reserved resources of a single time slot may increase the flexibility of the transmission system, and since the time slot resources are limited, the possibility of finding a plurality of time slots for aggregated transmission is lower than the possibility of finding a single time slot for transmission, therefore, for the RSRP threshold for excluding resources, the former requirement is lower than the latter requirement due to the practical consideration of the resource occupation characteristics, which is a reasonable balance between excluding time slot resources with high interference level and ensuring sufficient time slot resources for transmission requirements.

Handling of time slot aggregated bypass transmission and UL overlap

In an actual transmission scenario, when the UE is within a coverage of a cellular network, the UE may need to transmit an uplink and a bypass at the same time, that is, uplink transmission and bypass transmission of the same UE may overlap, and if the uplink transmission and the bypass transmission share the same Radio Frequency (RF), the UE needs to perform a trade-off between the uplink transmission and the bypass transmission; if the uplink transmission and the bypass transmission use different RFs but share the total transmission power, the UE needs to adjust between the uplink transmission power and the bypass transmission power.

In LTE V2X, when uplink and bypass transmissions of the same UE overlap, if the priority of the psch of the bypass transmission is higher than a priority threshold (i.e. the value of the priority indicated in the SCI is smaller than a predefined or preconfigured threshold), the TX UE drops the transmission of the uplink if the uplink and the bypass share the same carrier; if the uplink and bypass use different carriers, the TX UE reduces the power of the uplink transmission in the overlap region so that the total transmit power of the uplink transmission and the bypass transmission does not exceed the maximum transmit power. If the priority of the psch of the bypassed transmission is lower than the predefined priority (i.e. the value of the priority indicated in the SCI is greater than a predefined or preconfigured threshold value), the TX UE drops the bypassed transmission if the uplink shares the same carrier with the bypass; if the uplink and bypass use different carriers, the TX UE reduces the power of the bypass transmission in the overlap region so that the total transmit power of the uplink and bypass transmissions does not exceed the maximum transmit power.

Alternatively, the predefined or preconfigured thresholds may be different for the psch of a single slot and the psch of an aggregated slot. For example, the predefined or preconfigured threshold for handling psch transmission overlapping with uplink transmission in a single slot, and the predefined or preconfigured threshold for handling psch transmission overlapping with uplink transmission in an aggregated slot may be configured separately.

Alternatively, if the above-mentioned bypass transmission overlapping the uplink transmission is a psch transmission on an aggregation slot, when the TX UE discards the bypass transmission, the TX UE discards the bypass transmission on other aggregation slots in addition to the bypass transmission on the overlapping slot, i.e., discards the bypass transmission on all aggregation slots.

Alternatively, if the above-mentioned bypass transmission overlapping with the uplink transmission is a psch transmission performed on an aggregated slot, when the TX UE reduces the power of the bypass transmission in the overlapping region, the TX UE applies the reduced transmit power to the bypass transmission on other slots in addition to reducing the power of the bypass transmission on the overlapping slot, i.e. keeping the transmit power on all aggregated slots the same.

Alternatively, if the above-mentioned bypass transmission overlapping with the uplink transmission is a psch transmission performed on an aggregated slot, when the TX UE discards the bypass transmission, the TX UE discards only the bypass transmission on the overlapping slot and does not discard the bypass transmission on other aggregated slots.

Alternatively, if the above-mentioned bypass transmission overlapping with the uplink transmission is a psch transmission performed on an aggregated slot, when the TX UE decreases the power of the bypass transmission of the overlapping region, the TX UE only decreases the power of the bypass transmission on the overlapping slot, and does not decrease the power of the bypass transmission on other slots.

Alternatively, if the above-mentioned bypass transmission overlapping the uplink transmission is a psch transmission on an aggregated slot, when the TX UE discards the bypass transmission, whether the TX UE discards the bypass transmission on the overlapping slot or discards the bypass transmission on all aggregated slots depends on the position of the overlapping slot. For example, if the overlapping time slot is the first aggregation time slot, then the TX UE discards the bypass transmission on all the bypass aggregation time slots, otherwise, the TX UE only discards the bypass transmission on the overlapping time slot.

The mode of discarding or adjusting the power of the bypass transmission on all the aggregation time slots is beneficial to avoiding unnecessary power waste, and embodies the reasonable use of the sending power; the mode of only discarding or adjusting the power of the overlapped bypass transmission on the aggregation time slot considers the decoding success rate, and reduces the retransmission under some conditions.

For example, in the second pscch resource occupancy scheme, the above-mentioned partial discard processing scheme is more applicable in a scenario where the bypass slot overlapping with the uplink transmission is an aggregation slot other than the first aggregation slot. Since the control signaling concentrated on the PSCCH resources in the first aggregated slot is not affected, there is still a high probability that the RX UE can decode successfully. For example, in the second pscch resource occupancy scheme, the above-described full discard processing scheme is more suitable in a scenario where a bypass slot overlapping with uplink transmission is the first aggregation slot. Because the control signaling concentrated on the PSCCH resource in the first aggregated slot is affected, the likelihood that the RX UE will be able to decode successfully is very low even if the transmission in the other aggregated slots is maintained, rather than discarding the transmission of all aggregated slots, avoiding unnecessary waste of power.

PSSCH of slot aggregation and corresponding Physical bypass feedback channel (Physical Sidelink) Feedback Channel, PSFCH) timing relationship

In the NR V2X system, unicast or multicast psch transmission supports HARQ feedback functionality, i.e., RX UEs receiving the unicast or multicast psch feed back the decoding result (ACK or NACK) of the psch to TX UEs, which is carried over the PSFCH. There is a predefined mapping relationship between the resources of the PSFCH and the corresponding PSSCH resources, i.e., the RX UE may determine the PSFCH resources corresponding to the PSSCH resources from the received PSSCH resources. Therefore, the TX UE does not need to explicitly inform the RX UE of the PSFCH resource corresponding to the PSSCH resource through signaling. The PSFCH resource refers to one PSFCH resource in time, frequency, and code domains.

In one embodiment, when the unicast psch or multicast pscch transmission uses a slot aggregation scheme, the RX UE determines a corresponding PSFCH resource according to a psch resource on a last aggregation slot for transmitting HARQ feedback.

The above-described solution of the PSFCH resource corresponding to the PSSCH resource of the last aggregation slot of the plurality of aggregation slots may be advantageous. Specifically, the RX UE may perform joint decoding after receiving the pschs on all aggregation slots, so as to reduce the number of psch decoding times of the RX UE and simplify the behavior of feedback HARQ of the RX UE.

In another embodiment, when the unicast psch or multicast psch transmission uses slot aggregation and the pschs are transmitted by the above-described retransmission, the RX UE may attempt to decode the received pschs before not completely receiving the psch transmissions in all aggregation slots, and when the decoding is successful, may feed back an ACK to the TX UE in advance, the ACK fed back in advance using the pscch resources determined by the pscch resources on a slot before the last aggregation slot.

The above-described solution in which the PSFCH resource corresponds to a PSSCH resource of one of the plurality of aggregation slots except for a last aggregation slot may be advantageous. Specifically, the RX UE may attempt to decode the psch in advance and feed back an ACK to the TX UE in advance when the early decoding is successful, so as to improve the HARQ feedback delay of the psch transmission, and even the TX UE may discard the subsequent psch transmission after receiving the ACK fed back by the RX UE in advance, so as to save power.

Alternatively, the RX UE may attempt to combine and decode early the pschs on the received slots after receiving the pschs on each aggregated slot. Alternatively, the RX UE may attempt to combine and decode early the pschs on a received slot after receiving the pschs on a certain number of aggregated slots. For the early decoding, if the RX UE successfully decodes the psch early on an aggregation slot prior to a last aggregation slot, the RX UE may send ACK feedback for the early decoding to the TX UE on a PSFCH resource corresponding to the PSSCH resource of the aggregation slot, the RX UE not needing to receive a PSSCH transmission in a subsequent aggregation slot; if the early decoding is unsuccessful, the RX UE may continue to receive pscch transmissions on subsequent aggregation slots until pscch transmissions on all aggregation slots are completely received, and feed back a final pscch decoding result on a pscch resource corresponding to a pscch resource of a last aggregation slot. The early decoding mode can improve the HARQ feedback time delay of PSSCH transmission.

In the V2X system, the UE is operating in half duplex, i.e., the TX UE cannot receive any bypass signal/channel when transmitting the pscch. If the aggregated slots used for PSSCH transmission are logically contiguous, then the TX UE cannot receive the bypass signal/channel transmitted by other UEs until the PSSCH on all aggregated slots has been transmitted. Thus, the beneficial effects that may result in the above-mentioned HARQ feedback delay with respect to improving psch transmission may be limited. Specifically, for example, the PSFCH time slot for the TX UE to receive the early feedback ACK should be located after the corresponding PSSCH aggregation time slot for the TX UE to transmit, i.e., the RX UE should transmit the PSFCH for the early feedback ACK at least after the TX UE has transmitted the PSSCH over all aggregation time slots. In other words, not all the PSFCH resources corresponding to the PSSCH resources of each aggregation slot except the last aggregation slot can be used for the early feedback of the ACK, but only the PSFCH resources located after all the aggregation slots of the PSSCH can be used for the early feedback of the ACK.

The TX UE transmits the pscch on a logically contiguous number of aggregated slots, and even if the early decoding is successful, the TX UE cannot receive HARQ feedback before the pscch transmission is completed. As shown in fig. 4 below, the PSFCH resource corresponding to the PSSCH resource of the second last aggregation slot is the earliest PSFCH slot that can receive the early decoding success ACK feedback.

To address the above limitation, optionally, the multiple aggregation slots used for transmitting the pschs may be logically discrete, i.e., there is a gap between the multiple aggregation slots, and the RX UE may transmit the PSFCH for the early feedback ACK on the gap slot, and the TX UE receives the PSFCH for the early feedback ACK, which the RX UE may possibly transmit, on the gap slot. In other words, the RX UE may send the ACK in advance before the TX UE has sent the pschs on all aggregated slots. If the TX UE receives an early decoded ACK sent by the RX UE, the TX UE may discard PSSCH repeated transmissions on the following aggregation slot to save power.

The TX UE transmits the psch on a non-logically contiguous plurality of aggregated slots, and if the early decoding is successful, the TX UE may receive HARQ feedback before completing the psch transmission. As shown in fig. 5 below, the TX UE may receive ACK feedback that the early decoding was successful in the reserved gap slots between the aggregation slots before completing the pscch transmission on all aggregation slots.

Limitation of total number of slots of all PSSCH resources indicated by SCI

In order to flexibly allocate the bypass resources, the bypass resource allocation method can simultaneously support the bypass resource allocation in a single time slot and the bypass resource allocation in an aggregation time slot, and even can support the bypass resource allocation in different numbers of aggregation time slots. Furthermore, the SCI may indicate one or more reserved psch resources for subsequent transmission in addition to the currently transmitted psch resources, the purpose of indicating the reserved psch resources by the SCI in advance is to avoid resource collision, and other UEs should exclude the reserved resources indicated by the received SCI from the candidate resource set when autonomously selecting the bypass resource. The SCI may collectively indicate a maximum of N psch resources, including currently transmitted psch resources, which may be used for initial or retransmission of one Transport Block (TB) or multiple TBs, N being a system-predefined or preconfigured value, e.g., N-4.

If the HARQ feedback function is not enabled, the N psch resources may include psch resources for blind retransmissions of TBs, e.g., the SCI may indicate psch resources for initial transmissions of the same TB and up to 3 blind retransmissions, or the SCI may also indicate psch resources for initial transmissions of 2 TBs and up to 1 blind retransmission.

If the HARQ feedback function is enabled, whether the N psch resources are used for initial transmission or retransmission of one TB or multiple TBs depends on HARQ feedback, for example, if the RX UE feeds back ACK to the TX UE, when the TX UE has data to transmit, the next psch resource reserved by the SCI may be used for initial transmission of a new TB, and when the TX UE has no data to transmit, the next psch resource reserved by the SCI may have nothing to transmit, be directly left idle, or be released for use by other UEs; if the feedback from the RX UE to the TX UE is NACK, the next psch resource reserved by the SCI can be used for retransmission of the same TB.

Optionally, the SCI may indicate the psch resources within one slot, may also indicate the psch resources within an aggregated slot, and may even indicate the psch resources within a different number of aggregated slots, and may indicate N psch resources (including within currently transmitted psch resources) at most, so as to avoid that the total psch resources indicated by the SCI occupy too many slots, the system provides that the total number of slots included in all the psch resources indicated by the SCI cannot exceed a predefined or preconfigured threshold value.

In other words, the maximum number of total slots occupied by all psch resources indicated by the SCI is predefined or preconfigured, rather than defaulting to the product of the maximum number of psch resources that the SCI can indicate and the maximum number of aggregated slots. For example, the maximum number of aggregation-enabled timeslots supported by the psch is 4, the maximum number of psch resources that the SCI can indicate is 4, and the maximum number of total timeslots occupied by all psch resources that the SCI indicates is 8, i.e. all psch resources that the SCI indicates cannot include more than 8 total timeslots. When aggregated slots are used for resource allocation, the limitation of the total slot number causes a corresponding reduction in the maximum number of psch resources that can be indicated by the SCI. In Mode 2 based on distributed resource allocation, the UE should follow the above rules when autonomously selecting the bypass resource.

The use of the above rules may be advantageous. Specifically, the excessive occupation of the same UE on the time slot resources is avoided, the relative fairness is provided for the UE which is not configured with time slot aggregation transmission, and the resource allocation is more effectively facilitated.

Assistant information reporting for aggregated timeslot transmission in Mode 1

When the bypass channel quality is poor and the TX UE transmit power is limited, the aggregated slot transmission based on the repeated transmission scheme may be used to improve coverage.

In Mode 1 based on centralized resource allocation, the serving base station may allocate multiple aggregated slots for the psch to improve the coverage of the bypass transmission, and the TX UE may report some assistance information to the base station in order to help the base station decide whether to use slot aggregation (also referred to as slot repetition or slot bundling) and/or decide the appropriate number of slots for aggregation/repetition/bundling. The TX UE may report Channel Quality Information (CQI) of the bypass Channel to the base station, for example, the TX UE may report SL CQI to the base station through PUCCH, where the SL CQI is measured by the RX UE and fed back to the TX UE, and if the SL CQI is poor, the base station may enable resource allocation for timeslot aggregation transmission or allocate more timeslot numbers for aggregation; and/or, the TX UE may send a bypass Power Headroom Report (PHR) to the base station, for example, the TX UE may Report the SL PHR to the base station through the MAC CE, and if the SL PHR is low, the base station may enable resource allocation for timeslot aggregation transmission or allocate more timeslot numbers for aggregation, where the SL PHR is a transmission Power Headroom calculated by the TX UE based on a resource allocation granularity (subchannel) of the SL channel, unlike the conventional UL PHR.

When the amount of data to be transmitted is large, the aggregated timeslot transmission may be used to support a larger TBS.

In Mode 1 based on localized resource allocation, the serving bs may allocate multiple aggregated slots to the psch to support a larger TBS, and the TX UE may report some assistance information to the bs in order to help the bs decide whether to use slot aggregation and/or decide the appropriate number of slots for aggregation. The TX UE may report at least one of the QoS of the data to be transmitted, the data amount to be transmitted, and the target communication distance to the base station, for example, if the QoS of the data to be transmitted is higher, the data amount to be transmitted is larger, and/or the target communication distance is larger, the base station may enable resource allocation for timeslot aggregation transmission, or allocate more timeslot numbers for aggregation.

The technical solution for reporting the auxiliary information may be advantageous. Specifically, the auxiliary information may help the base station to more accurately allocate adaptive bypass resources for the current bypass channel quality, the bypass transmission power headroom of the TX UE, the QoS of the data to be transmitted, the data amount to be transmitted, and the target communication distance.

The resource allocation method for aggregation/bundling/repetition of multiple slots for the NR V2X system provided by the present application can also be applied in the LTE V2X system, i.e. the psch of the LTE V2X system can be transmitted on multiple aggregated/bundled/repeated subframes using the above method.

Those skilled in the art will appreciate that the present invention includes apparatus directed to performing one or more of the operations described in the present application. These devices may be specially designed and manufactured for the required purposes, or they may comprise known devices in general-purpose computers. These devices have stored therein computer programs that are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., computer) readable medium, including, but not limited to, any type of disk including floppy disks, hard disks, optical disks, CD-ROMs, and magnetic-optical disks, ROMs (Read-Only memories), RAMs (Random Access memories), EPROMs (Erasable Programmable Read-Only memories), EEPROMs (Electrically Erasable Programmable Read-Only memories), flash memories, magnetic cards, or optical cards, or any type of media suitable for storing electronic instructions, and each coupled to a bus. That is, a readable medium includes any medium that stores or transmits information in a form readable by a device (e.g., a computer).

It will be understood by those within the art that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. Those skilled in the art will appreciate that the computer program instructions may be implemented by a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, implement the features specified in the block or blocks of the block diagrams and/or flowchart illustrations of the present disclosure.

Those of skill in the art will appreciate that various operations, methods, steps in the processes, acts, or solutions discussed in the present application may be alternated, modified, combined, or deleted. Further, various operations, methods, steps in the flows, which have been discussed in the present application, may be interchanged, modified, rearranged, decomposed, combined, or eliminated. Further, steps, measures, schemes in the various operations, methods, procedures disclosed in the prior art and the present invention can also be alternated, changed, rearranged, decomposed, combined, or deleted.

The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (20)

1. A method for bypassing a transmission, the method comprising:

user Equipment (UE) determines configuration parameters of aggregation time slot transmission;

based on the configuration parameters, the UE determines an aggregated time slot resource; and

the UE performs a physical bypass shared channel PSCCH transmission and a corresponding physical bypass control channel PSCCH transmission on the aggregated slot resources.

2. The method of claim 1, wherein,

performing the PSSCH transmission on PSSCH resources within the aggregated slot; or

Performing the PSSCH transmission on PSSCH resources within the aggregated slot and PSCCH resources within other aggregated slots except the first aggregated slot.

3. The method of claim 2, wherein for a case in which the PSSCH transmission is performed on PSSCH resources within the aggregated slot,

transmitting a PSCCH corresponding to the PSSCH on a PSCCH resource in each of the aggregation time slots; or

And sending the PSCCH corresponding to the PSSCH on the PSCCH resources in the first aggregation time slot in the aggregation time slots, wherein the PSCCH resources in other aggregation time slots except the first aggregation time slot are idle.

4. The method of claim 2, wherein for a case where the PSSCH transmission is performed on PSSCH resources within the aggregated slot and PSCCH resources within other aggregated slots other than the first aggregated slot,

determining a transport block size of a PSSCH according to the number of resource elements used for PSSCH mapping in a first aggregation slot; or

Determining the transport block size of the PSSCH according to the number of resource elements used for PSSCH mapping in other aggregation time slots except for the first aggregation time slot; or

And determining the transport block size of the PSSCH according to the total number of resource elements used for PSSCH mapping in all the aggregation time slots.

5. The method of claim 1, wherein the UE repeatedly transmits the psch within the aggregated slot.

6. The method of claim 5, wherein,

using the same redundancy version in each of the aggregated slots in which the PSSCH is repeatedly transmitted; or

The redundancy version used at each of the aggregated slots in which the PSSCH is repeatedly transmitted uses a predefined or preconfigured redundancy version cycle.

7. The method of claim 1, wherein the UE transmits the psch in an overall rate-matched manner within the aggregated slot.

8. The method of claim 2, wherein the UE transmits the psch using different analog beams within the aggregated slot.

9. The method of claim 1, wherein the configuration parameters comprise an aggregation slot validation/validation identifier, a maximum number of aggregated slots, a redundancy version, RV, cycle validation/validation identifier, RV cycle, a threshold for quality of service, Qos, of a psch transmitted using aggregation slots, a threshold for transport block size, TBS, of a psch transmitted using aggregation slots, a target communication distance of a psch transmitted using aggregation slots, a bypass channel quality, of an aggregation slot, a bypass power headroom, of an aggregation slot, a reference signal received power, RSRP, of a reserved aggregation slot resource to exclude from a set of candidate resources, a reference signal received power, RSRP, of a reserved aggregation slot resource, a reference signal received power, a signal received signal, a, And at least one of a threshold value for handling a priority of a PSSCH in which aggregated slot transmissions overlap with uplink transmissions.

10. The method of claim 9, wherein in the case that the values of the aggregated slot validate/validate-not-validate identifiers are validate and validate-not, respectively, at least one of the following conditions is satisfied:

the format of the SCI indicating the bypass resource for the psch transmission is different;

in Mode 1 based on localized resource allocation, formats of downlink control information DCI for scheduling bypass resources for pscch transmission are different.

11. The method of claim 9, wherein the configuration parameter is pre-configured for at least one of a specific resource pool, a specific UE, a specific quality of service, a specific transport block size.

12. The method of claim 1, wherein the number of the starting slot of the PSSCH transmission is divisible by the total number of slots of the aggregated slot.

13. The method of claim 1, wherein in Mode 2 based on distributed resource allocation, the UE, when autonomously selecting the bypass resource for PSSCH transmission,

the UE preferentially selects the bypass resources in the single time slot for PSSCH transmission, and if not enough bypass resources can be selected in the single time slot, the UE selects the bypass resources of the time slot aggregation for PSSCH transmission; and/or

The UE preferentially selects the bypass resources of the logically continuous time slot aggregation for one-time transmission of the data to be transmitted, if the bypass resources of the logically continuous time slot aggregation are not enough to be selected, the UE decomposes the data to be transmitted into a plurality of transmission blocks, and determines the bypass resources of the single time slot for the plurality of transmission blocks respectively.

14. The method of claim 1, wherein the UE determines whether to use aggregated slot resources for the PSSCH transmission, a maximum number of aggregated slots, and/or a number of aggregated slots based on at least one of a quality of service and a transport block size of the PSSCH to be transmitted.

15. The method of claim 1, wherein when the UE's uplink transmission and the aggregate slot's bypass transmission overlap, dropping the bypass transmission by the UE if the priority of the bypass transmission is below a priority threshold of the psch for handling the overlap of the uplink transmission and the aggregate slot's bypass transmission comprises:

discarding the bypass transmission on the time slot where the overlap occurs; or

Discarding bypass transmissions on all aggregated timeslots; or

If the overlapped time slot is the first aggregation time slot, discarding the bypass transmission on all aggregation time slots; if the overlapping slot is not the first aggregated slot, the UE only discards the bypass transmission on the overlapping slot.

16. The method of claim 1, further comprising: the UE receives ACK feedback for successful early decoding of the PSSCH on PSFCH resources corresponding to the PSSCH resources within one of the aggregation slots other than the last aggregation slot.

17. The method of claim 1, wherein a total number of slots of the bypass resource selected by the UE at one time for psch transmission does not exceed a predefined or preconfigured threshold value.

18. The method of claim 1, further comprising: the UE reports auxiliary information used for deciding whether to use the aggregated time slot transmission and/or deciding the number of the aggregated time slots to a serving base station, wherein the auxiliary information comprises at least one of QoS of data to be transmitted, data volume to be transmitted, a target communication distance, a Channel Quality Indicator (CQI) of a bypass channel and bypass Power Headroom Reporting (PHR).

19. An apparatus for bypassing a transmission, the apparatus performing the method of claims 1-18.

20. A computer device for bypass transmission comprising a memory, a processor, the memory having stored thereon instructions that, when executed by the processor, implement the method of claims 1-18.

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