WO2024065510A1

WO2024065510A1 - Method for sidelink communication and terminal device

Info

Publication number: WO2024065510A1
Application number: PCT/CN2022/122887
Authority: WO
Inventors: 冷冰雪; 卢前溪; 张博源
Original assignee: Oppo广东移动通信有限公司
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2024-04-04

Abstract

Provided are a method for sidelink communication and a terminal device. The method comprises: a terminal device performs resource selection or resource reselection in a first candidate resource set for sidelink unlicensed spectrum transmission according to first information, wherein the first information is associated with a first sidelink transmission mode, and the first sidelink transmission mode is continuous sidelink transmission on a plurality of time domain resources. According to embodiments of the present application, the terminal device can perform resource selection or resource reselection in the first candidate resource set for sidelink unlicensed spectrum transmission on the basis of the first information associated with the first sidelink transmission mode, that is, when performing resource selection or resource reselection, the terminal device takes the first information associated with the first sidelink transmission mode into consideration, facilitating improvement of the degree of matching between the resource selection or resource reselection and a first sidelink transmission model.

Description

Method and terminal device for sideline communication

Technical Field

The present application relates to the field of communication technology, and more specifically, to a method and terminal device for sideline communication.

Background technique

In the unlicensed spectrum, the communication device needs to listen before talk (LBT) and can access the channel only after the LBT is successful. After the communication device successfully accesses the channel through LBT, the communication device can transmit continuously or discontinuously within the corresponding channel occupancy time (COT). At present, in order to make more full use of the COT initiated after the LBT is successful, the first side transmission mode may be introduced in the side communication based on the unlicensed spectrum, that is, the terminal device can continuously transmit on multiple time domain resources (for example, time slots) to improve the utilization rate of COT. However, in the side communication scenario, the traditional resource selection or resource reselection does not match the first side transmission mode. Therefore, it is urgent to improve the traditional resource selection or resource reselection.

Summary of the invention

The present application provides a method and terminal device for sideline communication. The following introduces various aspects involved in the present application.

In a first aspect, a method for sidelink communication is provided, comprising: a terminal device performs resource selection or resource reselection in a first candidate resource set for sidelink unlicensed spectrum transmission based on first information; wherein the first information is associated with a first sidelink transmission mode, and the first sidelink transmission mode is continuous sidelink transmission on multiple time domain resources.

In a second aspect, a terminal device is provided, comprising: a processing unit, configured to perform resource selection or resource reselection in a first set of candidate resources for sidelink unlicensed spectrum transmission based on first information; wherein the first information is associated with a first sidelink transmission mode, and the first sidelink transmission mode is continuous sidelink transmission on multiple time domain resources.

In a third aspect, a terminal device is provided, comprising a processor, a memory and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer programs in the memory so that the terminal device executes part or all of the steps in the method of the first aspect.

In a fourth aspect, an embodiment of the present application provides a communication system, which includes the above-mentioned terminal device. In another possible design, the system may also include other devices that interact with the terminal device in the solution provided by the embodiment of the present application.

In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and the computer program enables a communication device (for example, a terminal device) to execute part or all of the steps in the methods of the above aspects.

In a sixth aspect, an embodiment of the present application provides a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to enable a communication device (e.g., a terminal device) to perform some or all of the steps in the methods of the above various aspects. In some implementations, the computer program product can be a software installation package.

In a seventh aspect, an embodiment of the present application provides a chip comprising a memory and a processor, wherein the processor can call and run a computer program from the memory to implement some or all of the steps described in the methods of the above aspects.

In an embodiment of the present application, the terminal device can perform resource selection or resource reselection in a first set of candidate resources for sideline unlicensed spectrum transmission based on first information associated with the first sideline transmission mode. That is to say, when performing resource selection or resource reselection, the terminal device takes into account the first information associated with the first sideline transmission mode, which helps to improve the degree of match between resource selection or resource reselection and the first sideline transmission model, and avoids the problem of mismatch with the first sideline transmission mode caused by traditional resource selection or resource reselection schemes, in which resource selection or resource reselection is performed based on time domain resources as the granularity.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a diagram showing an example of a system architecture of a wireless communication system to which an embodiment of the present application can be applied.

FIG. 2 is an example diagram of a scenario of sideline communication within network coverage.

FIG3 is an example diagram of a scenario of sideline communication with partial network coverage.

FIG. 4 is a diagram showing an example scenario of sideline communication outside network coverage.

FIG. 5 is a diagram showing an example scenario of side communication based on a central control node.

FIG. 6 is an exemplary diagram of a sideline communication method based on broadcasting.

FIG. 7 is an example diagram of a sideline communication method based on unicast.

FIG. 8 is an example diagram of a sideline communication method based on multicast.

FIG. 9 is a schematic diagram showing a physical layer structure of sideline communication.

FIG. 10 is a schematic diagram showing a resource reservation method for sideline communication.

FIG. 11 is a schematic diagram showing a resource selection method based on listening in a sideline communication system.

FIG. 12 is a schematic flowchart of a method for sideline communication according to an embodiment of the present application.

FIG13( a ) is a schematic flowchart of a method for sideline communication according to another embodiment of the present application.

FIG13( b ) is a schematic flowchart of a method for sideline communication according to another embodiment of the present application.

FIG. 14 is a schematic flowchart of a sideline communication method according to another embodiment of the present application.

FIG. 15 is a schematic flowchart of a sideline communication method according to another embodiment of the present application.

FIG. 16 is a schematic diagram of a terminal device according to an embodiment of the present application.

FIG. 17 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed ways

The technical solution in this application will be described below in conjunction with the accompanying drawings.

Communication system architecture

1 is a diagram showing an example of a system architecture of a wireless communication system 100 to which an embodiment of the present application can be applied. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide communication coverage for a specific geographical area, and may communicate with the terminal device 120 located in the coverage area.

FIG1 exemplarily shows a network device and a terminal device. Optionally, the wireless communication system 100 may include one or more network devices 110 and/or one or more terminal devices 120. For one network device 110, the one or more terminal devices 120 may all be located within the network coverage of the network device 110, or may all be located outside the network coverage of the network device 110, or may be partially located within the coverage of the network device 110 and partially located outside the network coverage of the network device 110, which is not limited in the embodiments of the present application.

Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiments of the present application.

It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: the fifth generation (5th generation, 5G) system or new radio (new radio, NR), long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD), etc. The technical solutions provided by the present application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

The terminal device in the embodiment of the present application may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal equipment, mobile device, user terminal, wireless communication equipment, user agent or user device. The terminal device in the embodiment of the present application may be a device that provides voice and/or data connectivity to a user, and can be used to connect people, objects and machines, such as a handheld device with wireless connection function, a vehicle-mounted device, etc. The terminal device in the embodiment of the present application can be a mobile phone, a tablet computer, a laptop, a PDA, a mobile internet device (MID), a wearable device, a vehicle, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. For example, the terminal device can act as a dispatching entity, which provides a sidelink signal between terminal devices in vehicle-to-everything (V2X) or device-to-device communication (D2D), etc. For example, a cellular phone and a car communicate with each other using a sidelink signal. The cellular phone and the smart home device communicate with each other without relaying the communication signal through a base station. Optionally, the terminal device can be used to act as a base station.

The network device in the embodiment of the present application may be a device for communicating with a terminal device, and the network device may also be referred to as an access network device or a wireless access network device, such as a base station. The network device in the embodiment of the present application may refer to a wireless access network (RAN) node (or device) that connects a terminal device to a wireless network. Base station can broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station MeNB, auxiliary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, base band unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station may also refer to a communication module, modem or chip used to be set in the aforementioned device or apparatus. The base station may also be a mobile switching center and a device that performs the base station function in device-to-device D2D, V2X, machine-to-machine (M2M) communication, a network-side device in a 6G network, and a device that performs the base station function in a future communication system. The base station may support networks with the same or different access technologies. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device.

Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device includes a CU and a DU. The gNB may also include an AAU.

The network equipment and terminal equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on aircraft, balloons and satellites in the air. The embodiments of the present application do not limit the scenarios in which the network equipment and terminal equipment are located.

Sideline communication under different network coverage conditions

Sidelink communication refers to communication technology based on sidelinks. Sidelink communication can be, for example, device-to-device (D2D) or vehicle-to-everything (V2X) communication. In traditional cellular systems, communication data is received or sent between terminal devices and network devices, while sidelink communication supports direct communication data transmission between terminal devices. Compared with traditional cellular communications, direct communication data transmission between terminal devices can have higher spectrum efficiency and lower transmission latency. For example, the vehicle networking system adopts sidelink communication technology.

In side communication, according to the network coverage of the terminal device, the side communication can be divided into side communication within the network coverage, side communication with partial network coverage, and side communication outside the network coverage.

FIG2 is a diagram showing an example of a sideline communication scenario within network coverage. In the scenario shown in FIG2, both terminal devices 120a are within the coverage of the network device 110. Therefore, both terminal devices 120a can receive the configuration signaling of the network device 110 (the configuration signaling in this application can also be replaced by configuration information), and determine the sideline configuration according to the configuration signaling of the network device 110. After both terminal devices 120a perform the sideline configuration, sideline communication can be performed on the sideline link.

FIG3 is a diagram showing an example of a sidelink communication scenario with partial network coverage. In the scenario shown in FIG3 , terminal device 120a performs sidelink communication with terminal device 120b. Terminal device 120a is located within the coverage of network device 110, so terminal device 120a can receive the configuration signaling of network device 110 and determine the sidelink configuration according to the configuration signaling of network device 110. Terminal device 120b is located outside the network coverage and cannot receive the configuration signaling of network device 110. In this case, terminal device 120b can determine the sidelink configuration according to the pre-configuration information and/or the information carried in the physical sidelink broadcast channel (PSBCH) sent by terminal device 120a located within the network coverage. After both terminal device 120a and terminal device 120b perform sidelink configuration, sidelink communication can be performed on the sidelink.

FIG4 is a diagram showing an example of a sideline communication scenario outside network coverage. In the scenario shown in FIG4, both terminal devices 120b are outside network coverage. In this case, both terminal devices 120b can determine the sideline configuration according to the preconfiguration information. After both terminal devices 120b perform the sideline configuration, sideline communication can be performed on the sideline link.

Sideline communication based on central control node

FIG5 is a diagram showing an example of a sideline communication scenario based on a central control node. In the sideline communication scenario, multiple terminal devices may constitute a communication group, and the communication group has a central control node. The central control node may be a terminal device in the communication group (such as terminal device 1 in FIG5 ), which may also be referred to as a cluster head (CH) terminal device. The central control node may be responsible for completing one or more of the following functions: establishing a communication group, joining and leaving of group members of the communication group, coordinating resources within the communication group, allocating sideline transmission resources to other terminal devices, receiving sideline feedback information from other terminal devices, and coordinating resources with other communication groups.

Sideline communication mode

Certain standards or protocols (such as the 3rd Generation Partnership Project (3GPP)) define two modes of sideline communication: a first mode and a second mode.

In the first mode, the resources of the terminal device (the resources mentioned in this application may also be referred to as transmission resources, such as time-frequency resources) are allocated by the network device. The terminal device can send data on the sidelink according to the resources allocated by the network device. The network device can allocate resources for a single transmission to the terminal device, or it can allocate resources for semi-static transmission to the terminal device. This first mode can be applied to scenarios covered by network devices, such as the scenario shown in Figure 2 above. In the scenario shown in Figure 2, the terminal device 120a is within the network coverage of the network device 110, so the network device 110 can allocate resources used in the sidelink transmission process to the terminal device 120a.

In the second mode, the terminal device can autonomously select one or more resources from a resource pool (RP). Then, the terminal device can perform side transmission according to the selected resources. For example, in the scenario shown in FIG. 4 , the terminal device 120b is located outside the cell coverage. Therefore, the terminal device 120b can autonomously select resources from a preconfigured resource pool for side transmission. Alternatively, in the scenario shown in FIG. 2 , the terminal device 120a can also autonomously select one or more resources from a resource pool configured by the network device 110 for side transmission.

Data transmission method of sideline communication

Some side communication systems (such as long term evolution vehicle to everything (LTE-V2X)) support broadcast-based data transmission (hereinafter referred to as broadcast transmission). For broadcast transmission, the receiving terminal can be any terminal device around the transmitting terminal. Taking Figure 6 as an example, terminal device 1 is the transmitting terminal, and the receiving terminal corresponding to the transmitting terminal is any terminal device around terminal device 1, for example, it can be terminal device 2-terminal device 6 in Figure 6.

In addition to broadcast transmission, some communication systems also support unicast-based data transmission (hereinafter referred to as unicast transmission) and/or multicast-based data transmission (hereinafter referred to as multicast transmission). For example, the new radio vehicle to everything (NR-V2X) hopes to support autonomous driving. Autonomous driving places higher requirements on data interaction between vehicles. For example, data interaction between vehicles requires higher throughput, lower latency, higher reliability, larger coverage, more flexible resource allocation methods, etc. Therefore, in order to improve the performance of data interaction between vehicles, NR-V2X introduces unicast transmission and multicast transmission.

For unicast transmission, the receiving terminal generally has only one terminal device. Taking Figure 7 as an example, unicast transmission is performed between terminal device 1 and terminal device 2. Terminal device 1 can be a sending terminal, terminal device 2 can be a receiving terminal, or terminal device 1 can be a receiving terminal, and terminal device 2 can be a sending terminal.

For multicast transmission, the receiving terminal can be a terminal device in a communication group, or the receiving terminal can be a terminal device within a certain transmission distance. Taking Figure 8 as an example, terminal device 1, terminal device 2, terminal device 3 and terminal device 4 constitute a communication group. If terminal device 1 sends data, the other terminal devices in the group (terminal device 2 to terminal device 4) can all be receiving terminals.

Physical layer structure of sideline communication

FIG9 shows a schematic diagram of the physical layer structure of the sidelink communication. Referring to FIG9 , the physical sidelink control channel (physical sidelink control channel, PSCCH) can be used to carry the first sidelink control information. The physical sidelink shared channel (physical sidelink shared channel, PSSCH) can be used to carry the sidelink data and the second sidelink control information. The PSCCH and PSSCH can be multiplexed and sent in the same time slot.

The first sidelink control information (SCI) is carried in the PSCCH, which mainly includes fields related to resource monitoring, and is used for resource exclusion and resource selection after decoding by other terminals. In addition to sidelink data, the PSSCH can also carry second sidelink control information, which mainly includes fields related to data demodulation, and is used by the receiving terminal to demodulate the data carried in the PSSCH associated with the PSCCH.

Resource reservation for sideline communication

As described in the sideline communication mode above, in mode 2, the terminal device can autonomously select sideline resources to send data. Resource reservation can be understood as a prerequisite for supporting the terminal device to select resources. Resource reservation means that the terminal device can reserve the selected sideline resources (e.g., time-frequency resources) in the first sideline control information carried by the PSCCH.

At present, in the sideline communication system, both intra-TB resource reservation and inter-TB resource reservation are supported.

Referring to FIG. 10 , the terminal device sends a first SCI, and uses the time resource assignment field and the frequency resource assignment field in the first SCI to indicate the N time-frequency resources used for the current TB transmission (including the time-frequency resources used for the current transmission block (TB)). Usually, N≤Nmax, and in NR V2X, Nmax is equal to 2 or 3. At the same time, the above-mentioned N indicated time-frequency resources can be distributed in W time slots. In NR V2X, W is equal to 32.

Continuing to refer to FIG. 10 , during the transmission of TB 1, the terminal device can send the first SCI in the PSCCH while sending the initial transmission data in the PSSCH, and use the above two fields in the first SCI to indicate the time-frequency resource positions of the initial transmission and retransmission 1 (i.e., N=2 at this time), i.e., reserve the time-frequency resources for retransmission 1. Usually, the initial transmission and retransmission 1 are distributed in 32 time slots in the time domain.

Similarly, referring to FIG. 10 , during the transmission of TB 1, the terminal device can use the first SCI sent in the PSCCH of retransmission 1 to indicate the time-frequency resources of retransmission 1 and retransmission 2. The time-frequency resources of retransmission 1 and the time-frequency resources of retransmission 2 can be distributed in 32 time slots in the time domain.

In addition, when the terminal device sends the first SCI, it can use the resource reservation period field in the first SCI to reserve resources between TBs.

Continuing to refer to FIG. 10 , when the terminal device sends the first SCI indicating the initial transmission resources of TB 1, it can use the time domain resource allocation domain and the frequency domain resource allocation domain in the first SCI to indicate the time-frequency resource position of the initial transmission and retransmission 1 of TB 1, which is recorded as {(t1, f1), (t2, f2)}. Among them, t1 and t2 represent the time domain position of the initial transmission and retransmission 1 resources of TB 1, and f1 and f2 represent the frequency domain position of the initial transmission and retransmission 1 resources of TB 1. If the value of the resource reservation period domain in the first SCI is 100 milliseconds, the first SCI simultaneously indicates the time-frequency resources {(t1+100, f1), (t2+100, f2)}, and these two resources are used for the transmission of the initial transmission and retransmission 1 of TB 2.

Similarly, the first SCI sent on the retransmission 1 resource of TB 1 can also reserve the time-frequency resources of TB 2 retransmission 1 and retransmission 2 using the resource reservation period field. In NR V2X, the possible values of the resource reservation period field are 0, 1-99, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000 milliseconds, which is more flexible than LTE V2X. However, in each resource pool, usually only k values are configured, and the terminal device can determine the possible values to be used based on the resource pool used. The k values in the resource pool configuration are recorded as the resource reservation period set M. For example, k is less than or equal to 16.

In addition, through network configuration or pre-configuration, the above-mentioned reservation between TBs can be activated or deactivated in units of resource pools. When deactivating the reservation between TBs, the first SCI does not include the resource reservation period field. Generally, before triggering resource reselection, the value of the resource reservation period field used by the terminal device, that is, the resource reservation period, will not change. Each time the terminal device sends the first SCI, it uses the "resource reservation period field" therein to reserve the resources of the next period for the transmission of another TB, thereby achieving periodic semi-continuous transmission.

When the terminal device operates in the above-mentioned mode 2, the terminal device can obtain the first SCI sent by other terminal devices by listening to the PSCCH sent by other terminal devices, thereby knowing the resources reserved by other terminal devices. When the terminal device performs resource selection next, it will exclude the resources reserved by the above-mentioned other terminal devices, thereby avoiding resource collision. The following introduces the resource selection method based on listening in the side communication system in conjunction with Figure 11.

Listening-based resource selection method

Referring to Figure 11, the terminal device may trigger resource selection or reselection in time slot n. In some implementations, time slot n may be a time slot in which the high layer triggers the physical layer to report a set of candidate resources. The resource selection window starts from n+T ₁ and ends at n+T ₂ , expressed as [n+T ₁ , n+T ₂ ]. Wherein, 0<=T ₁ <=T _proc,1 , when the subcarrier spacing is 15, 30, 60, 120kHz, T _proc,1 is 3, 5, 9, 17 time slots. T _2min <=T ₂ <=remaining delay budget of the service, the value set of T _2min is {1, 5, 10, 20}*2μ time slots, where μ=0, 1, 2, 3 corresponds to the case where the subcarrier spacing is 15, 30, 60, 120kHz. The terminal device determines T _2min from the value set according to the priority of its own data to be sent. For example, when the subcarrier spacing is 15kHz, the terminal device determines _T2min from the set {1,5,10,20} according to the priority of its own data to be sent. When _T2min is greater than or equal to the remaining delay budget of the service, _T2 is equal to the remaining delay budget of the service. The remaining delay budget is the difference between the corresponding time of the data delay requirement and the current time. For example, the data packet arriving at time slot n has a delay requirement of 50 milliseconds. Assuming that a time slot is 1 millisecond, if the current time is time slot n, the remaining delay budget is 50 milliseconds. If the current time is time slot n+20, the remaining delay budget is 30 milliseconds.

Before resource selection, the terminal device needs to perform resource listening in the listening window of nT ₀ to nT _proc,0, where T ₀ is 100 or 1100 milliseconds. When the subcarrier spacing is 15, 30, 60, or 120 kHz, T _proc,0 is 1, 2, or 4 time slots. Generally speaking, a terminal device will listen to the first SCI sent by other terminal devices in each time slot (except its own transmission time slot). If resource selection or reselection is triggered in time slot n, the terminal device can use the result of resource listening from nT ₀ to nT _proc,0 . The resource selection process is introduced below in conjunction with steps 1 to 2.

Step 1: The terminal device uses all candidate available resources in the resource selection window that belong to the resource pool used by the terminal device as a resource set A. Specifically, there are two cases 1-1 and 1-2.

In case 1-1, if the terminal device sends data in time slot m within the listening window and does not listen, the terminal device will determine the corresponding one or more time slots based on time slot m and each allowed resource reservation period in the resource pool used by the terminal device, with the resource reservation period as the interval. The terminal device needs to exclude all resources located in the above one or more time slots from resource set A.

Case 1-2: If the terminal device detects the first SCI transmitted in the PSCCH in time slot m within the listening window, it measures the SL-reference signal receiving power (RSRP) of the PSCCH or the SL-RSRP of the PSSCH scheduled by the PSCCH (i.e. the SL-RSRP of the associated PSSCH sent in the same time slot as the PSCCH).

If the measured SL-RSRP is greater than the SL-RSRP threshold, the terminal device determines the resources reserved for the SPCCH based on the resource reservation information in the sidelink control information transmitted in the PSCCH. If the reserved resources are in resource set A, the terminal device excludes these reserved resources from set A.

If the remaining resources in resource set A after resource exclusion are less than X% of all resources before resource exclusion, the SL-RSRP threshold is raised by 3dB and step 1 is re-executed. The physical layer reports resource set A after resource exclusion as a candidate resource set to the upper layer.

Step 2: The high layer randomly selects a resource from the reported candidate resource set to send data. That is, the terminal device randomly selects a resource from the candidate resource set to send data.

In some implementations, step 1 may be performed by the physical layer of the terminal device, and accordingly, the high layer in step 2 may be a high layer relative to the physical layer, such as the MAC layer.

It should be noted that the above RSRP threshold is determined by the priority P1 carried in the PSCCH detected by the terminal device and the priority P2 of the data to be sent by the terminal device.

In addition, whether the terminal device uses the measured PSCCH-RSRP or the PSSCH-RSRP scheduled by the PSCCH to compare with the SL-RSRP threshold depends on the resource pool configuration of the resource pool used by the terminal device. The resource pool configuration may be network configuration or preconfigured.

It should also be noted that the possible values of X, X are {20%, 35%, 50%}. The configuration of the resource pool used by the terminal device includes the correspondence between the priority and the above possible values. The terminal device determines the value of X according to the priority of the data to be sent and the correspondence. The resource pool configuration can be configured by the network or pre-configured.

Unlicensed spectrum

Unlicensed spectrum is a spectrum that can be used for radio equipment communications, which is divided by countries and regions. This spectrum is generally considered to be a shared spectrum. That is, as long as the communication equipment in the same or different communication systems meets the regulatory requirements set by the country or region on the spectrum, they can use the spectrum without applying for exclusive spectrum authorization from the government.

In order to allow various communication devices (or communication systems) that use unlicensed spectrum for wireless communication to coexist in a friendly manner on the spectrum, some countries or regions have stipulated regulatory requirements that need to be met when using unlicensed spectrum. For example, communication devices follow the "listen before talk (LBT)" principle. The so-called LBT means that before a communication device sends a signal on a channel of the unlicensed spectrum, it needs to perform channel sensing. If the channel sensing result is that the channel is idle, the communication device can use the channel of the unlicensed spectrum to send signals; if the channel sensing result is that the channel is busy, the communication device is usually not allowed to use the channel of the unlicensed spectrum to send signals.

Signal transmission in unlicensed spectrum involves concepts related to channel occupancy, such as channel occupancy time (COT), maximum channel occupancy time (MCOT), COT of network equipment (such as base stations), and COT of terminal equipment.

MCOT may refer to the maximum length of time that a communication device is allowed to use a channel of unlicensed spectrum for signal transmission when LBT is successful. It should be understood that MCOT refers to the time occupied by signal transmission. If the channel access priority class (CAPC) of a communication device is different, the MCOT corresponding to the communication device may be different. The maximum value of MCOT can be set to 10ms, for example.

COT can refer to the length of time for signal transmission using the channel of unlicensed spectrum after LBT is successful. Within the time length corresponding to COT, the channel occupied by the signal can be discontinuous in the time domain. Generally speaking, a COT cannot exceed 20ms at most. In addition, the time length occupied by the signal transmission within the COT should not exceed MCOT.

The COT of a network device is also called the COT initiated by the network device. Taking the gNB as an example, the COT of a network device can be called the gNB-initiated COT. The COT of a network device can refer to the channel occupancy time obtained after the LBT of the network device is successful. In addition to being used for downlink transmission, the channel occupancy time of a network device can also be used for uplink transmission of terminal devices under certain conditions.

The COT of a terminal device is also called the COT initiated by the terminal device. Taking the terminal device as a UE as an example, the COT of the terminal device can be called the UE-initiated COT. The COT of a terminal device can refer to the channel occupancy time obtained by the terminal device after the LBT is successful.

The following takes the SL-U system as an example to illustrate the COT sharing mechanism. It can be understood that the COT sharing mechanism described below can also be applied to other communication systems.

In order to ensure that the communication devices in the SL-U system can continue to use the channel within the acquired COT, the SL-U frame structure can support a 16us guard period (GP) symbol. In some implementations, the length of the GP can be reduced by reusing the cyclic prefix extension (CP extension).

The terminal device can complete COT sharing by indicating COT sharing information. The shared COT terminal device can realize COT sharing by inheriting or forwarding COT sharing information. COT information can be carried in the physical layer control signaling sidelink control information (SCI). If the COT sharing information is carried in the SCI, the implementation of COT sharing can consider the processing time. The processing time can be the time for the terminal device to receive and decode the COT sharing information carried in the SCI. Furthermore, the relationship between the processing time and the minimum listening time specified by the law can be considered.

The COT sharing information indicated by the terminal device initiating COT may include one or more of the following information: remaining COT duration information, available subband information (this information can be obtained through the resource indication information carried by SCI), CAPC information and COT sharing identification (identity, ID) information, etc.

The COT sharing information inherited by the shared COT terminal device may include: remaining COT duration information, available subband information (this information can be obtained through resource indication information carried by SCI), CAPC information and COT sharing ID information, etc.

The COT shared ID information may include at least one or more of the following: target terminal ID, terminal group ID, service identification information, and side traffic area identification (SL zone ID).

The inheritance and forwarding of COT shared information can meet the following processing time conditions: the time length between the end position of the received SCI symbol and the start position of the sent SCI symbol is greater than or equal to the first time length (for example, it can be represented by Tproc, SL-U), where Tproc, SL-U can be the processing time that needs to be considered for the inheritance and forwarding of COT shared information.

When the terminal device receives multiple COT shared information that meets the processing time condition, solution 1 and/or solution 2 may be considered to select appropriate COT shared information to inherit and forward.

Solution 1: The terminal device may select to inherit and forward the COT shared information with the longest remaining COT length according to the remaining COT length among multiple COT shared information. The COT shared information with the longest remaining COT length forwarded by the terminal device may be determined relative to the sending time of the terminal device.

Solution 2: When the remaining COT lengths determined based on multiple COT sharing information are the same, the terminal device can choose to inherit and forward the COT sharing information with the largest CAPC value based on the CAPC values in the multiple COT sharing information.

It should be noted that the above-mentioned multiple COT sharing information can be multiple COT sharing information that can be used by the terminal device. In addition to the above scheme, the inheritance and forwarding of COT information can also be performed based on other information. For example, the inheritance and forwarding of COT information can be performed based on the resource block set (RB set) information in the COT sharing information.

If the COT sharing conditions are met, the terminal device can be allowed to perform COT sharing.

As an implementation manner, the COT sharing condition may be determined based on the COT sharing ID information. For example, a terminal group may be determined based on the COT sharing ID information, and the COT may be shared between terminal devices in the terminal group.

As an implementation method, the COT sharing mechanism can also be based on an implicit public group method to determine whether the COT shared by other terminals is valid according to the evaluation results of the responding device terminal. The evaluation criteria for COT sharing of the responding device terminal may include the following criteria: expected COT sharing range/area, channel quality measurement of the responding device terminal. The expected COT sharing range/area can be determined by SL Zone ID or RSRP measurement. The channel quality measurement of the responding device terminal may include, for example, a reference signal received power (RSRP) threshold or a constant bit rate (CBR) related measurement.

Channel access method for unlicensed spectrum

Some communication systems (such as NR-U system) introduce a channel access method through LBT. In addition, the communication system may also support channel access through short control signaling transmission (SCSt). The above two channel access methods are introduced below.

The basic concept of LBT has been introduced in the previous article. Here, we will focus on introducing several different types of LBT methods (i.e., several different types of channel access methods based on LBT).

Type 1 LBT method (Type 1 LBT method) can also be called multi-slot channel detection with random backoff based on contention window size adjustment. In Type 1 LBT method, the communication device can initiate channel occupation with a length of T _mcot according to the channel access priority p. If the network device uses Type 1 LBT method, the network device can not only send its own data during the channel occupation period, but also share the COT with the terminal device. The so-called sharing of COT with the terminal device means: allowing the terminal device to send data within the time length corresponding to the COT (that is, the COT obtained by the network device through channel access). Correspondingly, if the terminal device uses Type 1 LBT method, the terminal device can not only send its own data during the channel occupation period, but also share the COT with the network device. The following table shows the channel access priority and its corresponding parameters when the terminal device performs Type 1 LBT method.

Table 1 Channel access parameters corresponding to different channel priorities

pp	m _p m _p	CW _min,p CW _min,p	CW _max,p CW _max,p	T _mcot,p T _mcot,p	允许的CW _p取值 Allowable CW _p values
11	22	33	77	2ms2ms	{3,7}{3,7}
22	22	77	1515	4ms4ms	{7,15}{7,15}
33	33	1515	10231023	6或10ms6 or 10 ms	{15,31,63,127,255,511,1023}{15,31,63,127,255,511,1023}
44	77	1515	10231023	6 or 10ms6 or 10ms	{15,31,63,127,255,511,1023}{15,31,63,127,255,511,1023}

In the above Table 1, m _p refers to the number of backoff slots corresponding to the channel access priority p, CW _p refers to the contention window size corresponding to the channel access priority p, CW _min,p refers to the minimum value of CW _p corresponding to the channel access priority p, CW _max,p refers to the maximum value of CW _p corresponding to the channel access priority p, and T _mcot,p refers to the maximum channel occupancy time length corresponding to the channel access priority p. Among the four channel access priorities shown in Table 1, p=1 is the highest priority.

The Type 2 LBT method (Type 2 LBT method) may also be referred to as a channel access method based on a fixed-length channel monitoring time slot. The Type 2 LBT method includes the Type 2A LBT method (Type 2A LBT method), the Type 2B LBT method (Type 2B LBT method), and the Type 2C LBT method (Type 2C LBT method).

In the LBT mode of type 2A, the communication device can use a single time slot detection of the channel of 25us. That is, the communication device can start channel detection 25us before data starts to be sent. The 25us channel detection can include a 16us channel detection and a 9us channel detection. If both detection results indicate that the channel is idle, it can be considered that the channel is idle and channel access can be performed.

In the LBT mode of type 2B, the communication device may use a 16us single time slot channel detection. During the channel detection process, if the communication device detects that the channel is idle for more than 4us in the last 9us, the channel may be considered idle.

In the Type 2C LBT mode, the communication device can transmit data directly through the channel without channel detection. In the Type 2C LBT mode, the time difference between the current transmission and the previous transmission is less than or equal to 16us. In other words, if the time difference between two transmissions is less than or equal to 16us, they can be considered to be the same transmission and channel detection is not required. It should be noted that in the Type 2C LBT mode, the transmission time of the communication device is limited and usually cannot exceed 584us.

The above introduces the channel access method based on LBT, and the following introduces SCSt. In the unlicensed spectrum, in order to improve the success rate of communication equipment accessing the channel when transmitting control signaling, SCSt is introduced. SCSt is a transmission in which the communication device does not sense whether there are other signals on the channel. For example, SCSt is a communication device used to send management and control frames without sensing whether there are other signals on the channel. In other words, when a communication device adopts SCSt, the communication device does not need to listen to the channel to access the channel for transmission. However, the use of SCSt needs to meet certain conditions. For example, if a communication device hopes to use SCSt for channel access, the communication device needs to meet one or more of the following conditions: within the observation period of 50ms, the number of times SCSt is used is less than or equal to 50; and within the observation period of 50ms, the duration occupied by SCSt does not exceed 2.5ms.

It should be noted that LBT is usually also called channel access, and the type 1 LBT method can be called the type 1 channel access method, the type 2A LBT method can be called the type 2A channel access method, the type 2B LBT method can be called the type 2B channel access method, and the type 2C LBT method can be called the type 2C channel access method. In the embodiments of the present application, LBT and channel access can be interchangeable.

In addition, in the embodiment of the present application, the unlicensed spectrum may also be referred to as a “shared spectrum” or an “unlicensed spectrum for sidelink transmission.” The embodiment of the present application does not limit this.

Multiple consecutive slot transmission (MCSt)

As mentioned above, in the unlicensed spectrum, the communication device needs to perform LBT first, and can access the channel only after LBT is successful. When the communication device successfully accesses the channel through LBT, the communication device can transmit continuously or discontinuously within the corresponding COT. At present, on the one hand, in order to make more full use of the COT initiated after the LBT is successful, the concept of MCSt transmission may be introduced in SL-U, that is, the communication device can transmit continuously on multiple time slots to improve the utilization rate of COT. On the other hand, the use of MCSt transmission can continuously use/occupy the channel, which is conducive to competing for the channel with foreign systems (for example, Wi-Fi systems) and avoiding foreign systems from accessing the channel through LBT. For example, when the SL-U terminal adopts MCSt transmission, since the channel can be continuously occupied within the COT, at this time, Wi-Fi users cannot access the channel through LBT.

However, in the sideline communication scenario, traditional resource selection or resource reselection is performed with time domain resources (e.g., time slots) as the granularity. For example, the listening-based resource selection method described above in conjunction with FIG. 11 is performed with time slots as the granularity. In this resource selection process or resource reselection process with time domain resources as the granularity, the resource selected (or reselected) each time is either a single time domain resource or multiple time domain resources at periodic intervals. However, the first sideline transmission mode cannot be performed on either a single time domain resource or multiple time domain resources at periodic intervals.

Therefore, in order to support the first side transmission mode, an embodiment of the present application provides a method for resource selection and/or resource reselection. It should be noted that the embodiment of the present application does not limit the time domain resources, and the time domain resources can be any time domain unit specified in the existing communication system, such as time slots, symbols, subframes or frames. Of course, the time domain resources can also be newly introduced time domain units in future communication systems. The following is a schematic flow chart of the method for side communication in an embodiment of the present application in conjunction with Figure 12.

Fig. 12 is a schematic flow chart of a method for sideline communication according to an embodiment of the present application. The method shown in Fig. 12 includes step S1210.

In step S1210, the terminal device selects or reselects resources from a first set of candidate resources for sidelink unlicensed spectrum transmission according to the first information.

The first information is associated with a first sideline transmission mode, wherein the first sideline transmission mode is continuous sideline transmission on multiple time domain resources. For example, the first sideline transmission mode may be MCSt.

The first candidate resource set includes one or more candidate time domain resources. In some implementations, the first candidate resource set may be a resource set A obtained after resource listening in the listening-based resource selection method described above. In other implementations, the first candidate resource set may not include discontinuous time domain resources, or the first candidate resource set may only include time domain resources that are continuous in the time domain.

In an embodiment of the present application, resource reselection or resource selection may be performed on the first candidate resource set to determine multiple time domain resources corresponding to the first side transmission mode, that is, multiple continuous time domain resources may be selected from the first candidate resource set.

In some implementations, the above-mentioned multiple continuous time domain resources can be used to transmit a data packet multiple times. For example, the above-mentioned multiple continuous time domain resources include initial transmission resources and retransmission resources for a data packet. For another example, the above-mentioned multiple continuous time domain resources may include multiple retransmission resources for a data packet. Of course, in an embodiment of the present application, the above-mentioned multiple continuous time domain resources are used to transmit different multiple data packets.

In some implementations, the first information includes one or more of the following information: second information indicating whether resource selection or resource reselection is for one time domain resource or multiple consecutive time domain resources; third information for determining the resource to be reselected; fourth information indicating the number of time domain resources of the multiple consecutive time domain resources; fifth information indicating the number of hybrid automatic repeat request (HARQ) retransmissions of data to be transmitted; COT information of the terminal device, cooperation information between user devices; and sideline discontinuous reception (DRX) SL DRX information of the receiving end; priority information; information of the first candidate resource set; LBT result; the number of medium access control protocol data units (MAC PDU) to be transmitted.

If the first information includes the second information, the second information is used to indicate whether the resource selection or resource reselection is for one time domain resource or multiple continuous time domain resources, or in other words, the second information is used to indicate whether the resource selection or resource reselection is for multiple continuous time domain resources, or in other words, the second information is used to indicate whether the resource selection or resource reselection requires the selection of multiple continuous time domain resources.

Among them, the continuous multiple time domain resources can be understood as multiple time domain resources that are continuous in the time domain. Taking the time domain resource as a time slot as an example, the continuous multiple time domain resources can be understood as multiple time slots that are continuous in the time domain. Accordingly, resource selection or resource reselection for the continuous multiple time domain resources can be understood as performing resource selection or resource reselection on the continuous multiple time domain resources as a whole, or in other words, performing resource selection or resource reselection on the granularity of the continuous multiple time domain resources.

The above describes the content of the second information, and the following describes the method for determining the second information. In some implementations, the second information can be determined based on one or more of the following information: Quality of Service (QoS) requirements of the data to be transmitted; feedback information corresponding to the data to be transmitted; retransmission requirements of the data to be transmitted; priority of the data to be transmitted; sending configuration information corresponding to the data to be transmitted, and the data volume of the data to be transmitted.

Taking the determination of the second information based on the QoS requirement of the data to be transmitted as an example, in some implementations, the QoS requirement of the data to be transmitted can be used to indicate the transmission delay of the data to be transmitted. Accordingly, for data with higher transmission delay requirements, the second information can indicate that resource selection or resource reselection is for multiple continuous time domain resources, which helps to concentrate the data transmission in a continuous period of time to reduce the delay required for data transmission. On the contrary, for data with lower transmission delay requirements, the second information can indicate that resource selection or resource reselection is for one time domain resource, which helps to simplify the complexity of resource selection or resource reselection.

In other implementations, the QoS requirement of the data to be transmitted can be used to indicate the reliability of the data to be transmitted. Accordingly, for data requiring high reliability transmission, the second information can indicate that the resource selection or resource reselection is for multiple consecutive time domain resources, which helps to avoid the selected time domain resources being preempted by other communication devices, so as to improve the reliability of data transmission. On the contrary, for data requiring low reliability transmission, the second information can indicate that the resource selection or resource reselection is for one time domain resource, which helps to simplify the complexity of resource selection or resource reselection.

Taking the second information determined based on the feedback information corresponding to the data to be transmitted as an example, if the data to be transmitted is retransmission data, the feedback information may be the feedback information of the corresponding initial transmission data or other retransmission data previously transmitted. In some implementations, if the feedback information is an acknowledgement (ACK), at this time, the second information may indicate that the resource selection or resource reselection is for one time domain resource, which helps to simplify the complexity of resource selection or resource reselection. On the contrary, if the feedback information is a negative acknowledgement (NACK), at this time, the second information may indicate that the resource selection or resource reselection is for multiple consecutive time domain resources, which helps to improve the reliability of data transmission.

Taking the determination of the second information based on the retransmission requirement of the data to be transmitted as an example, if the data to be transmitted has a high retransmission requirement, the second information can indicate that the resource selection or resource reselection is for multiple continuous time domain resources, which helps to improve the reliability of data transmission. If the data to be transmitted has a low retransmission requirement, the second information can indicate that the resource selection or resource reselection is for one time domain resource, which helps to simplify the complexity of resource selection or resource reselection.

It should be noted that the retransmission requirement corresponding to the data to be transmitted can be determined based on whether the data to be transmitted is initial transmission data or retransmission data. If the data to be transmitted is initial transmission data, the corresponding retransmission requirement is relatively high. If the data to be transmitted is retransmission data, the corresponding retransmission requirement is relatively low.

Of course, the retransmission requirement corresponding to the data to be transmitted can be determined based on the QoS of the data to be transmitted. If the QoS of the data to be transmitted requires higher reliability, the corresponding retransmission requirement is relatively high. If the QoS of the data to be transmitted requires lower reliability, the corresponding retransmission requirement is relatively low. The embodiment of the present application does not specifically limit the method for determining the retransmission requirement.

Taking the second information as an example, if the priority of the data to be transmitted is high, the second information may indicate that the resource selection or resource reselection is for a plurality of continuous time domain resources, which helps to improve the reliability of data transmission. If the priority of the data to be transmitted is low, the second information may indicate that the resource selection or resource reselection is for one time domain resource, which helps to simplify the complexity of the resource selection or resource reselection.

In the embodiment of the present application, the priority of the data to be transmitted is not limited. For example, the priority of the data to be transmitted may be a sideline priority. For another example, the priority of the data to be transmitted may be a CAPC corresponding to the data.

Take the example of determining the second information based on the transmission configuration information (Tx profile) corresponding to the data to be transmitted. In some implementations, the transmission configuration information may carry indication information 1, which may be used to indicate whether the data to be transmitted needs to be continuously transmitted on multiple continuous time domain resources. If the transmission configuration information indicates that the data to be transmitted needs to be continuously transmitted on multiple continuous time domain resources, the second information may indicate that the resource selection or resource reselection is for multiple continuous time domain resources. If the transmission configuration information indicates that the data to be transmitted does not need to be continuously transmitted on multiple continuous time domain resources, the second information may indicate that the resource selection or resource reselection is for one time domain resource.

Taking the second information determined based on the amount of data to be transmitted as an example, if the amount of data to be transmitted is large, the second information may indicate that resource selection or resource reselection is for multiple consecutive time domain resources, which is helpful to transmit the data to be transmitted in a concentrated period of time. If the amount of data to be transmitted is small, the second information may indicate that resource selection or resource reselection is for one time domain resource, which is helpful to simplify the complexity of resource selection or resource reselection.

Of course, in the embodiment of the present application, if the amount of data to be transmitted is small, and accordingly, the number of continuous time domain resources required is small, the second information may indicate that the resource selection or resource reselection is for a plurality of continuous time domain resources, which helps to reduce the complexity of resource selection or resource reselection. If the amount of data to be transmitted is large, and accordingly, the number of continuous time domain resources required is large, the second information may indicate that the resource selection or resource reselection is for one time domain resource, which helps to simplify the complexity of resource selection or resource reselection.

It should be noted that the above-mentioned amount of data to be transmitted may include the number of MAC PDUs to be transmitted, or the size of the data packet to be transmitted. In some implementations, the number of MAC PDUs to be transmitted may be used in a scenario where multiple different data are transmitted in a continuous plurality of time domain resources. In other implementations, the size of the data packet to be transmitted may be used in a scenario where the same data is repeatedly transmitted in a continuous plurality of time domain resources.

The above describes the content of the second information in the first information and the method for determining the second information. The following describes the third information in the first information.

If the first information includes the third information, the third information is used to determine the resource to be reselected, wherein the resource to be reselected may include the resource for which resource reselection is triggered, or the resource for which resource reselection is instructed (for ease of description, collectively referred to as "target resource"). Alternatively, the resource to be reselected may include the target resource and the resource adjacent to the target resource in the time domain. Alternatively, the resource to be reselected may also include the resource in the resource group where the target resource is located.

In some implementations, the third information may include one or more of the following information: information about the target resource indicated for resource reselection; information about the target resource triggered for resource reselection; information about resources adjacent to the target resource in the time domain; information about resources in the resource group where the target resource is located; and information indicating the occupancy status of the target resource.

The above-mentioned resource information may include indication information of the resource, for example, it may be an index of the resource, or it may be location information of the resource in the time domain, etc.

The information indicating the occupation of the target resource may include the situation where the target resource is preempted, for example, whether the target resource is preempted by a foreign system (for example, a Wi-Fi system). For another example, when the target resource is reserved by other terminal devices, the probability of being preempted by a foreign system (for example, a Wi-Fi system).

The third information in the first information is introduced above, and the fourth information included in the first information is introduced below.

If the first information includes the fourth information, the fourth information is used to indicate the number of time domain resources of the continuous multiple time domain resources. For example, the fourth information may indicate that the number of the continuous multiple time slots is N, that is, N time slots are continuous in the time domain, where N is a positive integer greater than 1.

The following describes a method for determining the fourth information of an embodiment of the present application in combination with determination method 1 to determination method 2.

Determination method 1, the fourth information is determined based on one or more of the following: the number of HARQ retransmissions of the data to be transmitted, the remaining COT time of the terminal device, the data size of the data to be transmitted, the available time domain resources for the data to be transmitted, the number of MAC PDUs to be transmitted, and the packet delay budget (PDB) of the data to be transmitted.

Taking the fourth information determined based on the number of HARQ retransmissions of the data to be transmitted as an example, in some cases, the multiple continuous time domain resources may include time domain resources for transmitting multiple retransmission data of the data to be transmitted, and therefore, the more the number of HARQ retransmissions of the data to be transmitted, the more the number of time domain resources of the multiple continuous time domain resources indicated by the fourth information. Conversely, the fewer the number of HARQ retransmissions of the data to be transmitted, the fewer the number of time domain resources of the multiple continuous time domain resources indicated by the fourth information.

Taking the fourth information determined based on the COT remaining time of the terminal device as an example, generally speaking, multiple continuous time domain resources can be located within the COT of the terminal device. Therefore, if the COT remaining time is longer, the number of time domain resources of the multiple continuous time domain resources indicated by the fourth information is greater. Conversely, if the COT remaining time is shorter, the number of time domain resources of the multiple continuous time domain resources indicated by the fourth information is smaller.

In the embodiment of the present application, the COT of the terminal device may be shared with the terminal device by other communication devices (network devices or other terminal devices). Of course, the COT of the terminal device may also be obtained by the terminal device itself through LBT, which is not limited in the embodiment of the present application.

Taking the fourth information as an example, the data size of the data to be transmitted can also be understood as the amount of data to be transmitted. If the amount of data to be transmitted is large, the number of time domain resources of the continuous multiple time domain resources indicated by the fourth information is larger. On the contrary, if the amount of data to be transmitted is large, the number of time domain resources of the continuous multiple time domain resources indicated by the fourth information is smaller.

Taking the fourth information determined based on the available time domain resources of the data to be transmitted as an example, if the available time domain resources are more, the number of time domain resources of the continuous multiple time domain resources indicated by the fourth information is more. On the contrary, if the available time domain resources are fewer, the number of time domain resources of the continuous multiple time domain resources indicated by the fourth information is fewer.

Taking the fourth information determined based on the number of MAC PDUs to be transmitted as an example, if the number of MAC PDUs to be transmitted is greater, the number of time domain resources of the continuous multiple time domain resources indicated by the fourth information is greater. Conversely, if the number of MAC PDUs to be transmitted is smaller, the number of time domain resources of the continuous multiple time domain resources indicated by the fourth information is smaller.

Taking the fourth information determined based on the PDB of the data to be transmitted as an example, if the PDB of the data to be transmitted is smaller, the number of time domain resources of the continuous multiple time domain resources indicated by the fourth information is smaller, which is helpful to transmit the data to be transmitted in a concentrated period of time to reduce the delay of the transmission. On the contrary, if the PDB of the data to be transmitted is larger, the number of time domain resources of the continuous multiple time domain resources indicated by the fourth information is larger, which is helpful to reduce the complexity of resource selection or resource reselection.

The determination method 1 described above is a scheme for determining the fourth information based on a certain information. In the embodiment of the present application, the fourth information can also be determined based on multiple information in the above information. For the sake of brevity, the following only introduces several implementation methods of the determination method 1 provided in the embodiment of the present application by way of example, and no longer lists the implementation methods based on each combination of information one by one.

Implementation method 1: Determine the number of time domain resources of multiple continuous time domain resources based on the number of HARQ retransmissions of the data to be transmitted and the remaining COT duration of the terminal device. As described above, assuming that the number of time domain resources of multiple continuous time domain resources can be determined as N ₁ based on the number of HARQ retransmissions of the data to be transmitted, and the number of time domain resources of multiple continuous time domain resources can be determined as N ₂ based on the remaining COT duration of the terminal device, accordingly, the minimum value can be selected from N ₁ and N ₂ as the final determined number of time domain resources N of multiple continuous time domain resources, that is, N = min (N ₁ , N ₂ ).

Of course, in the embodiment of the present application, the maximum value is selected from _N1 and _N2 as the final determined number of time domain resources N of the continuous multiple time domain resources. Alternatively, the average value of _N1 and _N2 is used as the final determined number of time domain resources N of the continuous multiple time domain resources, which is not limited in the embodiment of the present application.

Implementation method 2: Determine the number of time domain resources of multiple continuous time domain resources based on the number of HARQ retransmissions of the data to be transmitted, the remaining COT duration of the terminal device, and the PDB of the data to be transmitted. As described above, it is assumed that the number of time domain resources of multiple continuous time domain resources can be determined as N ₁ based on the number of HARQ retransmissions of the data to be transmitted, the number of time domain resources of multiple continuous time domain resources can be determined as N ₂ based on the remaining COT duration of the terminal device, and the number of time domain resources of multiple continuous time domain resources can be determined as N ₃ based on the PDB of the data to be transmitted. Accordingly, the minimum value can be selected from N ₁ , N ₂ and N ₃ as the final determined number of time domain resources N of multiple continuous time domain resources, that is, N = min (N ₁ , N ₂ , N ₃ ).

Of course, in the embodiment of the present application, the maximum value is selected from _N1 , _N2 and _N3 as the final determined number of time domain resources N of the continuous multiple time domain resources. Alternatively, the average value of _N1 , _N2 and _N3 is used as the final determined number of time domain resources N of the continuous multiple time domain resources, which is not limited in the embodiment of the present application.

Implementation method 3: Determine the number of time domain resources of multiple continuous time domain resources based on the number of MAC PDUs to be transmitted, the remaining COT duration of the terminal device, and the PDB of the data to be transmitted. As described above, it is assumed that the number of time domain resources of multiple continuous time domain resources can be determined as N ₁ based on the number of MAC PDUs to be transmitted, the number of time domain resources of multiple continuous time domain resources can be determined as N ₂ based on the remaining COT duration of the terminal device, and the number of time domain resources of multiple continuous time domain resources can be determined as N ₃ based on the PDB of the data to be transmitted. Accordingly, the minimum value can be selected from N ₁ , N ₂ and N ₃ as the final determined number of time domain resources N of multiple continuous time domain resources, that is, N = min (N ₁ , N ₂ , N ₃ ).

Implementation method 4: Determine the number of time domain resources of multiple continuous time domain resources based on the number of MAC PDUs to be transmitted, the number of HARQ retransmissions of the data to be transmitted, the remaining COT duration of the terminal device, and the PDB of the data to be transmitted. As described above, it is assumed that the number of time domain resources of multiple continuous time domain resources can be determined as N ₁ based on the product of the number of HARQ retransmissions of the data to be transmitted and the number of MAC PDUs to be transmitted, the number of time domain resources of multiple continuous time domain resources can be determined as N ₂ based on the remaining COT duration of the terminal device, and the number of time domain resources of multiple continuous time domain resources can be determined as N ₃ based on the PDB of the data to be transmitted. Accordingly, the minimum value can be selected from N ₁ , N ₂ and N ₃ as the final determined number of time domain resources N of multiple continuous time domain resources, that is, N = min (N ₁ , N ₂ , N ₃ ).

It should be noted that in the embodiment of the present application, the number of time domain resources required to transmit the same data can be determined by the number of HARQ retransmissions of the data to be transmitted. The number of time domain resources required to transmit different data can be determined by the number of MAC PDUs to be transmitted. The total amount of time domain resources required for multiple different data to be transmitted can also be determined by the product of the number of MAC PDUs to be transmitted and the number of HARQ retransmissions of the data to be transmitted.

In addition, the determination method 1 introduced above can be used by the terminal device before determining the first candidate resource set, that is, after the terminal device determines the number of time domain resources N of the continuous multiple time domain resources based on the above determination method 1, it can perform resource listening based on the number of time domain resources N of the continuous multiple time domain resources to determine the first candidate resource set. Of course, in the embodiment of the present application, the above method can also be used after determining the first candidate resource set, that is, the terminal device can select multiple continuous time domain resources from the first candidate resource set based on the number of time domain resources N of the continuous multiple time domain resources.

Determination method 2: the fourth information can be determined based on the second candidate resource set.

That is to say, the number N of time domain resources of the multiple consecutive time domain resources indicated by the fourth information can be determined based on the number of consecutive time domain resources supported by the second candidate resource set (hereinafter referred to as "first number").

In some implementations, assuming that the first candidate resource set includes different numbers of multiple continuous time domain resources, the first number may be a number with the largest number (or number of groups) of the multiple numbers. Assuming that the types of the number of continuous time domain resources included in the first candidate resource set include: type 1, 2 continuous time domain resources; type 2, 3 continuous time domain resources, and in the first candidate resource set, type 1 corresponds to 8 groups of time domain resources, and type 2 corresponds to 4 groups of time domain resources, at this time, the first number may be 2, that is, the number of continuous time domain resources in type 1. Accordingly, the number of time domain resources N of the multiple continuous time domain resources indicated by the fourth information may be 2.

In some other implementations, the first quantity may be the maximum value of the continuous time domain resources included in the first candidate resource set. Of course, the first quantity may also be the minimum value of the continuous time domain resources included in the first candidate resource set. Alternatively, the first quantity may also be the average value of the continuous time domain resources included in the first candidate resource set. This embodiment of the present application is not limited to this.

It should be noted that the above-mentioned determination method 2 can be performed after the terminal device determines the second candidate resource set. For example, when the physical layer performs resource detection and excludes unavailable resources, the second candidate resource set (for example, it can be the resource set A introduced above) can be obtained. Accordingly, the physical layer can determine the number of time domain resources N of multiple continuous time domain resources based on the second candidate resource set, and then exclude resources based on the number of time domain resources N of multiple continuous time domain resources to obtain the first candidate resource set. In other words, the first candidate resource set is determined based on the first information and the second candidate resource set, and the second candidate resource set is a candidate resource set obtained based on resource listening. In some implementations, the number of continuous time domain resources included in the first candidate resource set is greater than or equal to N.

The above text introduces the method of determining the fourth information in combination with determination method 1 and determination method 2. In the embodiment of the present application, the above two determination methods can be used separately. Of course, the above two determination methods can also be used in combination. The following text takes implementation method 2 as an example for improvement and introduces the combined use scheme. It should be understood that the various determination methods introduced in the embodiment of the present application can be arbitrarily combined. For the sake of brevity, they will not be described one by one below.

The following takes the implementation method 2 introduced above as an example, and introduces the determination scheme of the embodiment of the present application in combination with the determination method 2. Implementation method 2`: Determine the number of time domain resources of multiple consecutive time domain resources based on the first number of the first candidate resource set, the number of HARQ retransmissions of the data to be transmitted, the COT remaining duration of the terminal device, and the PDB of the data to be transmitted. As described above, it is assumed that the number of time domain resources of multiple consecutive time domain resources can be determined to be _N1 based on the number of HARQ retransmissions of the data to be transmitted, the number of time domain resources of multiple consecutive time domain resources can be determined to be _N2 based on the COT remaining duration of the terminal device, the number of time domain resources of multiple consecutive time domain resources can be determined to be _N3 based on the PDB of the data to be transmitted, and the number of time domain resources of multiple consecutive time domain resources can be determined to be _N4 based on the first number. Accordingly, the minimum value may be selected from N ₁ , N ₂ , N ₃ and N ₄ as the time domain resource quantity N of the multiple continuous time domain resources finally determined, that is, N=min(N ₁ , N ₂ , N ₃ , N ₄ ).

If the first information includes fifth information, the fifth information is used to indicate the number of HARQ retransmissions of the data to be transmitted.

If the first information includes COT information of the terminal device, the COT information of the terminal device may be used to indicate the available COT of the terminal device. In some implementations, the available COT of the terminal device may be the COT obtained by the terminal device through LBT. In other implementations, the available COT of the terminal device may be shared with the terminal device by other communication devices (e.g., network devices or other terminal devices).

In some implementations, the COT information may include COT time-related information, such as one or more of a COT remaining time, a COT start time, and a COT end time.

If the first information includes inter-UE coordination information, wherein the inter-UE coordination (IUC) information is used by the receiving terminal (i.e., the receiving terminal of the first sideline transmission mode) to indicate the conflicting resources to the above-mentioned terminal device (i.e., the transmitting terminal of the first sideline transmission mode), or in other words, the IUC is used to determine the time domain resources that the receiving terminal expects to perform sideline reception.

If the first information includes SL DRX information of the receiving end, wherein the receiving end may be a receiving terminal of the first sideline transmission mode, accordingly, the SL DRX information of the receiving end is used to indicate the DRX sleep period and/or DRX wake-up period of the receiving end.

If the first information includes priority information, in some implementations, the priority information may be the priority corresponding to the data to be transmitted, for example, the sideline priority of the data to be transmitted. For another example, it may be the CPAC corresponding to the data to be transmitted. Of course, in other implementations, the above priority may also be the priority of other terminal devices, and the priority of other terminal devices may be used to determine whether the terminal device can preempt the time domain resources reserved by other terminal devices.

If the first information includes information of the first candidate resource set, the information of the first candidate resource set is used to indicate the time domain resources belonging to the first candidate resource set, or in other words, the information of the first candidate resource set is used to identify the first candidate resource set.

In some implementations, the first candidate resource set may be obtained based on the fourth information and the second candidate resource set as described above. In other implementations, the first candidate resource set may also be a candidate resource set obtained based on resource interception, such as resource set A.

If the first information includes an LBT result, the LBT result may include LBT success and/or LBT failure.

If the first information includes the number of MAC PDUs to be transmitted, the number of MAC PDUs to be transmitted can be used to determine the amount of different multiple data to be transmitted.

The above describes the content of the first information in the embodiment of the present application, and the method for determining each information in the first information. The following describes the transmission method of the first information.

In some implementations, the first information may be information that the MAC layer of the terminal device indicates to the physical layer of the terminal device. For example, the first information may be information carried when the MAC layer indicates the physical layer to perform resource selection or resource reselection. Of course, in the example of the present application, the first information may also be information sent before performing resource selection or resource reselection. For example, the first information may be semi-statically configured information, which may be used for performing resource reselection or resource selection within a semi-static period.

In some implementations, the first information may also be used to trigger resource selection and resource reselection. Of course, in the embodiment of the present application, the first information and the information triggering resource selection and resource reselection may be two independent pieces of information.

It should be noted that in the embodiments of the present application, the manner in which the first information triggers resource selection and resource reselection is not limited. For example, the first information may trigger resource selection and resource reselection in an explicit manner, or in an implicit manner.

In the above transmission mode, the first information may include one or more of the following information: second information indicating whether the resource selection or resource reselection is for one time domain resource or multiple continuous time domain resources; fourth information indicating the number of time domain resources of multiple continuous time domain resources; fifth information indicating the number of HARQ retransmissions of data to be transmitted; COT information of the terminal device, cooperation information between user devices; and SL DRX information of the receiving end; priority information; LBT result; the number of MAC PDUs to be transmitted. Of course, in the embodiment of the present application, the first information may also include any information introduced above, and the embodiment of the present application is not limited to this.

In some other implementations, the first information is information reported by the physical layer of the terminal device to the MAC layer of the terminal device. For example, the first information may include information of the first candidate resource set. For another example, the first information may include information required by the MAC layer to select a plurality of continuous time domain resources from the first candidate resource set.

In the above transmission method, the first information may include one or more of the following information: fourth information indicating the number of time domain resources of a plurality of continuous time domain resources; information of the first candidate resource set; and LBT result. Of course, in the embodiment of the present application, the first information may also include any information introduced above, and the embodiment of the present application is not limited to this.

The above describes the transmission method of the first information. The following describes which operations in the resource selection method or resource reselection method can be performed in combination with the first information, which helps to improve the matching degree between the resource selection method or resource reselection method and the first side transmission method.

In some implementations, the first information is used to perform one or more of the following operations: the physical layer of the terminal device determines a first set of candidate resources; the MAC layer of the terminal device selects multiple consecutive time domain resources from the first set of candidate resources; the terminal device determines the time domain resources for resource reselection.

It should be noted that, in the above one or more operations, the content of the first information may be the same or different, and the present application embodiment does not limit this. The following describes the usage of the first information for the above operations respectively.

For operation 1, the first information is used by the physical layer of the terminal device to determine a first set of candidate resources.

Taking the first candidate resource set as the resource set A in the resource selection method based on resource listening mentioned above, it can be understood that the first information can be used for the physical layer to execute step 1 in the resource selection method based on resource listening.

Taking the example that the first information includes COT information of the terminal device, the physical layer can exclude resources within the COT based on the first information, exclude unavailable resources, and determine a first candidate resource set.

Taking the example that the first information includes the fourth information, the physical layer can determine the first candidate resource set from the second candidate resource set based on the number of time domain resources N of multiple consecutive time domain resources indicated by the fourth indication information, where the number of consecutive time domain resources included in the first candidate resource set is greater than or equal to N.

Taking the first information including the second information as an example, if the second indication information indicates that the resource selection or resource reselection is for a plurality of continuous time domain resources, correspondingly, the physical layer may select the first candidate resource set including the continuous time domain resources when determining the first candidate resource set. On the contrary, if the second indication information indicates that the resource selection or resource reselection is for one time domain resource, correspondingly, the physical layer may not pay attention to whether the first candidate resource set includes continuous time domain resources when determining the first candidate resource set.

Taking the example that the first information includes the fifth information, when determining the first candidate resource, the physical layer may determine the first candidate resource set based on the number of HARQ retransmissions of the data to be transmitted.

It should be noted that, for the above operation 1, the first information may include one or more of the information introduced above, so that the terminal device can determine the first candidate resource set. For the sake of brevity, they will not be described one by one below.

For operation 2, the first information is used by the MAC layer of the terminal device to select multiple continuous time domain resources from a first candidate resource set.

Taking the first candidate resource set as the resource set A of the resource selection method based on resource listening mentioned above, it can be understood that the first information can be used for the MAC layer to execute step 2 in the resource selection method based on resource listening.

Taking the example that the first information includes the fourth information, the MAC layer can select multiple continuous time domain resources from the first candidate resource set based on the number of time domain resources of the multiple continuous time domain resources indicated by the fourth indication information.

For operation 3, the first information is used by the terminal device to determine the time domain resources for resource reselection.

Taking the example that the first information includes the second information, if the second information indicates that resource selection or resource reselection is for multiple continuous time domain resources, these multiple continuous time domain resources can be regarded as a resource group, and accordingly, resource reselection can be performed in units of resource groups.

Assuming that the resource group includes time domain resource A, time domain resource B and time domain resource C that are continuous in the time domain, if time domain resource B is triggered (or instructed) to perform resource reselection, the terminal device needs to reselect resources for the resource group where time domain resource B is located, that is, the terminal device can reselect time domain resource A, time domain resource B and time domain resource C.

In the embodiment of the present application, performing resource reselection or resource selection on multiple continuous time domain resources helps to ensure that the multiple time domain resources are continuous in the time domain.

If the second information indicates that the resource reselection is for a time domain resource, in some implementations, the above-mentioned time domain resource for which resource reselection is triggered may be continuous in the time domain with other time domain resources that have been selected. Assuming that time domain resources A, time domain resource B, and time domain resource C that are continuous in the time domain are selected during the resource selection process, if time domain resource B is triggered (or instructed) to perform resource reselection, and during the resource reselection process, the terminal device selects time domain resource D. Among them, time domain resource D may be continuous in the time domain with time domain resource A and time domain resource C. Of course, in an embodiment of the present application, the time domain resource after resource reselection may also be discontinuous in the time domain with the time domain resource that has been selected, that is, time domain resource D is discontinuous in the time domain with time domain resource A and time domain resource C.

In an embodiment of the present application, performing resource reselection or resource selection for a time domain resource helps to reduce the complexity of resource reselection or resource selection performed by a terminal device.

It should be noted that the resource group mentioned above may be a concept introduced to facilitate understanding of the present application, that is, there is no real resource group in the process of resource selection or resource reselection. Of course, in the embodiment of the present application, the resource group mentioned above may also be a real resource division method, in which case the terminal device may perform resource reselection or resource selection based on the resource group as the granularity.

Taking the first information including the third information as an example, if the third information includes information of a target resource (i.e., a resource for which resource reselection is triggered or indicated), in some implementations, the terminal device may perform resource reselection for the target resource. In other implementations, the terminal device may perform resource reselection for the resource group where the target resource is located.

If the third information includes information about resources adjacent to the target resource in the time domain, in some implementations, the terminal device may perform resource reselection for multiple consecutive time domain resources based on the target resource and the adjacent resources.

If the third information includes information about resources in the resource group where the target resource is located, in some implementations, the terminal device may perform resource reselection for multiple consecutive time domain resources based on the resource group as a granularity.

The embodiments of the present application also provide conditions for triggering resource reselection. In some implementations, resource reselection can be triggered based on one or more of the following conditions: the target resource is indicated to have undergone resource re-evaluation (re-evalution); the target resource is reserved (pre-emption) by other terminal devices; the target resource is indicated to have a conflict (for example, indicated by IUC); the target resource is located outside the SL DRX activation period of the receiving terminal; the target resource is abandoned or ignored (drop/ignore); resource reselection is triggered based on the terminal device; the LBT of the terminal device fails. Of course, other methods of triggering resource reselection can also be supported in the embodiments of the present application, and the embodiments of the present application are not limited to this.

It should be noted that there are many reasons why the above target resource is abandoned or ignored. For example, the target resource may be abandoned or ignored because it is an unavailable resource. For another example, the target resource may be abandoned or ignored because the terminal device has a low priority corresponding to uploading data on the target resource. This embodiment of the application is not limited to this.

As introduced above, the target resource can be understood as a resource for which resource reselection is triggered, or a resource for which resource reselection is indicated. In an embodiment of the present application, assuming that resource reselection is required for a target resource among a plurality of continuous time domain resources, the reselected resource can be located in the same time domain unit (e.g., time slot) as the target resource, but the reselected resource can include different frequency domain resources from the target resource, so that the reselected resource can be continuous in the time domain with the other original resources in the plurality of continuous time domain resources. Of course, in an embodiment of the present application, the reselected resource can also be located in a different time domain unit from the target resource.

Assuming that the continuous multiple time domain resources include time domain resource A, time domain resource B, and time domain resource C, if the resource triggered (or instructed) for resource reselection is time domain resource B, then time domain resource B is the target resource. If during the resource reselection process, the physical layer finds that time domain resource D has the same time domain position as time domain resource B, but includes different frequency domain resources, then the physical layer can indicate the MAC layer to the time domain resource D for the MAC layer to perform resource reselection. In this way, even if resource reselection is performed for one time domain resource B, the reselected time domain resource D can be continuous with the time domain resource A and the time domain resource C in the time domain.

In some implementations, if there are available resources in the time domain unit where the target resource is located, the physical layer may inform the MAC layer so that the MAC layer may give priority to selecting the resource.

In an embodiment of the present application, a terminal device (e.g., a MAC layer) may select a plurality of continuous time domain resources from a first candidate resource set, and the embodiment of the present application does not limit the specific selection method. In some implementations, the terminal device may select a plurality of continuous time domain resources through a single resource selection process (referred to as "selection method 1"). In other implementations, the terminal device may select a plurality of continuous time domain resources through multiple resource selection processes (referred to as "selection method 2").

The above-mentioned selection method 2 may include multiple implementation methods: implementation method 1 and implementation method 2.

Implementation method 1 of selection method 2: The terminal device may perform multiple resource selection processes and select one time domain resource in each resource selection process. Assuming that the number of time domain resources of the continuous multiple time domain resources is N, accordingly, by adopting implementation method 1 of selection method 2, the terminal device may perform N resource selection processes and select one time domain resource in each resource selection process.

Implementation method 2 of selection method 2: The terminal device may perform multiple resource selection processes, and select part of the time domain resources from the multiple continuous time domain resources in each resource selection process. Assuming that the number of time domain resources of the multiple continuous time domain resources is N, accordingly, by adopting implementation method 2 of selection method 2, the terminal device may perform two resource selection processes, and select N1 time domain resources in the first resource selection process, and select N2 time domain resources in the second resource selection process, wherein the sum of N1 and N2 is N, and N1, N2 and N are positive integers.

In some implementations, the above selection method 1 may be applicable to a scenario where multiple continuous time domain resources transmit the same data. That is, multiple continuous time domain resources for transmitting the same data may be selected through a resource selection process. These time domain resources may include initial transmission resources and retransmission resources of the data. Of course, these time domain resources may also include multiple retransmission resources of the data. Of course, the above selection method 1 may also be used in a scenario where different data are transmitted.

In other implementations, the above selection method 2 may be applicable to scenarios where multiple continuous time domain resources are used to transmit multiple different data. The time domain resources selected in each resource selection process may be used to transmit the same data, and the time domain resources selected between different resource selection processes may be used to transmit different data. For example, in the first resource selection process above, N1 time domain resources may be selected to transmit data 1, and in the second resource selection process, N2 time domain resources may be selected to transmit data 2. Of course, the above selection method 2 may also be used in scenarios where the same data is transmitted.

For ease of understanding, the following describes a schematic flow chart of the method for sideline communication of an embodiment of the present application in conjunction with Figures 13(a), 13(b), 14 and 15. It should be noted that the information involved in the process described below, the method for determining the information and the method for using the information can be found in the above description. The following mainly describes the process of resource selection or resource reselection of an embodiment of the present application. Among them, Figures 13(a), 13(b) and 14 are introduced by taking resource selection (or resource primary selection) as an example, and Figure 15 is introduced by taking resource reselection as an example.

FIG13 is a schematic flow chart of a method for sideline communication according to another embodiment of the present application. The scheme shown in FIG13(a) is described by taking the physical layer determining the number of time domain resources of a plurality of consecutive time domain resources based on determination method 2 as an example. The scheme shown in FIG13(b) is described by taking the physical layer determining the number of time domain resources of a plurality of consecutive time domain resources based on determination method 1 as an example.

The method shown in FIG. 13( a ) includes steps S1310 to S1360 .

In step S1310, the MAC layer triggers the physical layer to perform resource selection and sends first information to the physical layer.

In some implementations, the first information may include one or more of the following information: fifth information indicating the number of HARQ retransmissions of data to be transmitted; COT information of the terminal device, collaboration information between user devices; and SL DRX information of the receiving end; priority information; LBT results; and the number of MAC PDUs to be transmitted.

In step S1320, the physical layer determines a second candidate resource set based on the first information and the resource sensing result.

In some implementations, the physical layer eliminates unavailable resources through resource sensing to obtain the second candidate resource set.

In step S1330, the physical layer determines the number N of time domain resources of a plurality of consecutive time domain resources according to the second candidate resource set.

It should be noted that the scheme for the physical layer to determine the number N of time domain resources of multiple consecutive time domain resources can be found in the above introduction to determining the fourth information based on determination method 2. For the sake of brevity, it will not be repeated here.

In step S1340, the physical layer determines a first candidate resource set from a second candidate resource set based on the number N of time domain resources of a plurality of consecutive time domain resources.

In some implementations, the physical layer may exclude (or filter out) time domain resources whose continuous number of time domain resources is less than N from the second candidate resource set based on the number of time domain resources N of the continuous multiple time domain resources, to obtain the first time domain resource set. In step S1350, the physical layer sends information of the first candidate resource set to the MAC layer.

In step S1360, the MAC layer selects a plurality of continuous time domain resources from the first candidate resource set.

It should be noted that the method for the MAC layer to select multiple continuous time domain resources can be selected by sampling the selection method 1 or the selection method 2 introduced above, and the embodiment of the present application is not limited to this.

The method shown in FIG. 13( b ) includes steps S1370 to S1374 .

In step S1370, the MAC layer triggers the physical layer to perform resource selection and sends first information to the physical layer.

In step S1371, the physical layer determines the number N of time domain resources of a plurality of consecutive time domain resources based on the first information.

It should be noted that the physical layer can determine the number N of time domain resources of multiple consecutive time domain resources based on the first information based on the determination method 1 of the fourth information introduced above. For the sake of brevity, it will not be repeated here.

In step S1372, the physical layer determines a first candidate resource set based on the first information, the number N of time domain resources of a plurality of consecutive time domain resources, and a resource sensing result.

In some implementations, the physical layer may exclude unavailable resources through resource sensing to obtain the first candidate resource set. In other implementations, the physical layer determines the first candidate resource set based on the number N of time domain resources of a plurality of continuous time domain resources, which may be understood as the first candidate resource set determined by the physical layer including one or more resource groups of N number.

In step S1373, the physical layer sends information of the first candidate resource set and the number N of time domain resources of a plurality of consecutive time domain resources to the MAC layer.

In step S1374, the MAC layer selects a plurality of continuous time domain resources from the first candidate resource set based on the number N of time domain resources of the plurality of continuous time domain resources.

Fig. 14 is a schematic flow chart of a sideline communication method according to another embodiment of the present application. The solution shown in Fig. 14 is described by taking the MAC layer determining the number of time domain resources of a plurality of continuous time domain resources as an example. The method shown in Fig. 14 includes steps S1410 to S1450.

In step S1410, the MAC layer triggers the physical layer to perform resource selection and sends first information to the physical layer.

In step S1420, the physical layer determines a first candidate resource set based on the first information and the resource sensing result.

In step S1430, the physical layer sends information of the first candidate resource set to the MAC layer.

In step S1440, the MAC layer determines the number N of time domain resources of a plurality of consecutive time domain resources based on the first candidate resource set.

In some implementations, the MAC layer may determine the number of time domain resources of a plurality of consecutive time domain resources using determination method 2 described above.

In step S1450, the MAC layer selects a plurality of continuous time domain resources from a first candidate resource set based on the number N of time domain resources of the plurality of continuous time domain resources.

It should be noted that the method for the MAC layer to select multiple time domain resources can be selected by sampling the selection method 1 or the selection method 2 introduced above, and the embodiment of the present application is not limited to this.

It should be noted that, in the embodiment of the present application, the MAC may determine the number of the plurality of continuous time domain resources before step S1410, and indicate the physical layer through the first information. Accordingly, the MAC may no longer execute step S1440. The manner in which the MAC layer determines the plurality of time domain resources may refer to the relevant introduction of the determination manner 1 described above.

FIG15 is a schematic flow chart of a side communication method according to another embodiment of the present application. The method shown in FIG15 includes steps S1510 to S1560. It should be noted that the content of the first information in different steps shown in FIG15 may be different, and the information 1 and information 2 below may be regarded as an implementation of the first information.

In step S1510, resource reselection is triggered.

In some implementations, resource reselection may be triggered based on one or more of the following conditions: the target resource is indicated to be undergoing resource reselection (re-evalution); the target resource is reserved by other terminal devices (pre-emption); the target resource is indicated to be in conflict (for example, indicated by IUC); the target resource is located outside the SL DRX activation period of the receiving terminal; the target resource is abandoned or ignored (drop/ignore); resource reselection is triggered based on terminal device implementation; and LBT failure of the terminal device.

In step S1520 , the MAC layer determines the resource to be reselected based on information 1 .

The above-mentioned information 1 may include one or more of the following information: third information for determining resources to be reselected; QoS requirements for data to be transmitted; fifth information indicating the number of HARQ retransmissions of data to be transmitted; COT information of the terminal device, collaboration information between user devices; and SL DRX information of the receiving end; priority information; LBT results; the number of MAC PDUs to be transmitted; and information indicating the occupancy of target resources.

In some implementations, the third information may include one or more of the following: information about the target resource indicated for resource reselection; information about the target resource triggered for resource reselection; information about resources adjacent to the target resource in the time domain; and information about resources in the resource group where the target resource is located.

Assume that the target resource is time domain resource B, and time domain resource A is adjacent to time domain resource C and time domain resource B. At this time, the information of the resources adjacent to the target resource in the time domain may include information of time domain resource C and information of time domain resource B.

Assume that the target resource is time domain resource B, and time domain resource A, time domain resource C and time domain resource B belong to the same resource group. At this time, the information of the resources in the resource group where the target resource is located may include the information of time domain resource A, time domain resource B and time domain resource C in the resource group.

In step S1530, the MAC layer sends information 2 to the physical layer, indicating the resources that need to be reselected.

In some implementations, the above-mentioned information 2 may also include information indicating whether the resource reselection is for one time domain resource or multiple consecutive time domain resources.

In some implementations, when performing resource reselection for a time domain resource, the time domain resource may be a target resource for which resource reselection is indicated, or a target resource for which resource reselection is triggered. Continuing with the above-described time domain resource A, time domain resource B, and time domain resource C as examples, performing resource reselection for a time domain resource may be understood as performing resource reselection for time domain resource B.

In other implementations, when performing resource reselection for multiple continuous time domain resources, the multiple continuous time domain resources may include time domain resources that are adjacent to the target resource in the time domain, or all time domain resources in the resource group where the target resource is located. Continuing with the time domain resource A, time domain resource B, and time domain resource C introduced above as an example, performing resource reselection for multiple continuous time domain resources can be understood as performing resource reselection for time domain resource A, time domain resource B, and time domain resource C.

In step S1540 , the physical layer may determine a first candidate resource set based on information 2 .

In step S1550, the physical layer indicates information of the first candidate resource set to the MAC layer.

In some implementations, if there are available resources at other frequency domain locations within the time slot where the target resource is located, the physical layer may report the resources in the information of the first candidate resource set for selection by the MAC. In this way, it is not necessary to initiate resource reselection for multiple consecutive time domain resources, and it is also possible to satisfy that the reselected time domain resources are continuous in the time domain with the non-reselected resources in the multiple consecutive time domain resources.

Assuming that time domain resources A, B, and C that are continuous in the time domain are selected during the resource selection process, if time domain resource B is triggered (or instructed) to perform resource reselection, and during the resource reselection process, the physical layer finds that time domain resource D has the same time domain position as time domain resource B, but includes different frequency domain resources, then the physical layer can indicate the MAC layer to the time domain resource D for the MAC layer to perform resource reselection. In this way, even if resource reselection is performed for one time domain resource B, the reselected time domain resource D can be continuous with the time domain resource A and the time domain resource C in the time domain.

In step S1560, the MAC layer performs resource reselection in the first candidate resource set.

In some implementations, if the physical layer indicates that there are available resources at other frequency domain locations within the time slot where the target resource is located, the MAC layer can select the resource. That is, if the physical layer indicates the MAC layer time domain resource D, the MAC layer can select the time domain resource D accordingly, so that the reselected time domain resource D can also be continuous with the time domain resource A and the time domain resource C in the time domain.

It should be noted that the resource reselection process of the embodiment of the present application can be used in combination with any of the resource selection processes described above. For example, referring to FIG. 15 , before step S1510, a resource selection process 1500 can be executed, wherein 1500 can refer to the resource selection process shown in FIG. 13 (a), FIG. 13 (b) to FIG. 14 above, and for the sake of brevity, it will not be repeated here. Of course, the resource reselection process of the embodiment of the present application can also be used alone, and the embodiment of the present application does not limit this.

The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 15, and the device embodiment of the present application is described in detail below in conjunction with Figures 16 to 17. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment, so the part not described in detail can refer to the previous method embodiment.

FIG16 is a schematic diagram of a terminal device according to an embodiment of the present application. The terminal device 1600 shown in FIG16 includes a processing unit 1610 .

Processing unit 1610 is used to perform resource selection or resource reselection in a first set of candidate resources for sidelink unlicensed spectrum transmission based on first information; wherein the first information is associated with a first sidelink transmission mode, and the first sidelink transmission mode is continuous sidelink transmission on multiple time domain resources.

In a possible implementation, the first information includes one or more of the following information: second information indicating whether resource selection or resource reselection is for one time domain resource or multiple continuous time domain resources; third information for determining the resource to be reselected; fourth information indicating the number of time domain resources of multiple continuous time domain resources; fifth information indicating the number of hybrid automatic repeat request HARQ retransmissions of data to be transmitted; channel occupancy time COT information of the terminal device, cooperation information between user devices; and sideline discontinuous transmission SL DRX information of the receiving end; priority information; information of the first candidate resource set; listen-before-talk LBT result; the number of media access control protocol data units MAC PDU to be transmitted.

In one possible implementation, if the first information includes the second information, the second information is determined based on one or more of the following information: QoS requirements of the data to be transmitted; feedback information corresponding to the data to be transmitted; retransmission requirements of the data to be transmitted; priority of the data to be transmitted; sending configuration information corresponding to the data to be transmitted; and the data volume of the data to be transmitted.

In one possible implementation, if the first information includes the third information, the third information includes one or more of the following information: information about the target resource indicated for resource reselection; information about the target resource triggered for resource reselection; information about resources adjacent to the target resource in the time domain; information about resources in the resource group where the target resource is located; and information indicating the occupancy status of the target resource.

In one possible implementation, if the first information includes the fourth information, the fourth information is determined based on one or more of the following: the number of HARQ retransmissions of the data to be transmitted, the remaining COT duration of the terminal device, the data size of the data to be transmitted, the available time domain resources for the data to be transmitted, and the number of MAC PDUs to be transmitted.

In a possible implementation manner, if the first information includes the fourth information, the fourth information is determined based on the first candidate resource set.

In a possible implementation, the first information is information carried when the MAC layer of the terminal device instructs the physical layer of the terminal device to perform resource selection or resource reselection.

In a possible implementation, the first information is information reported by the physical layer of the terminal device to the MAC layer of the terminal device.

In one possible implementation, the first information is used to perform one or more of the following operations: the physical layer of the terminal device determines a first candidate resource set; the MAC layer of the terminal device selects the multiple time domain resources from the first candidate resource set; the terminal device determines the time domain resource for the resource reselection.

In a possible implementation manner, the first candidate resource set is determined based on the first information and a second candidate resource set, and the second candidate resource set is a candidate resource set obtained based on resource listening.

In a possible implementation, the multiple time domain resources are multiple time slots, and/or the continuous sideline transmission is multiple continuous time slot transmission MCSt.

In a possible implementation manner, the multiple time domain resources are used to transmit a data packet multiple times; or, the multiple time domain resources are used to transmit different multiple data packets.

In an optional embodiment, the processing unit 1610 may be a processor 1710. The terminal device 1600 may further include a transceiver 1730 and a memory 1720, as specifically shown in FIG. 17 .

FIG17 is a schematic structural diagram of a communication device according to an embodiment of the present application. The dotted lines in FIG17 indicate that the unit or module is optional. The device 1700 may be used to implement the method described in the above method embodiment. The device 1700 may be a chip, a terminal device, or a network device.

The device 1700 may include one or more processors 1710. The processor 1710 may support the device 1700 to implement the method described in the above method embodiment. The processor 1710 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

The apparatus 1700 may further include one or more memories 1720. The memory 1720 stores a program, which can be executed by the processor 1710, so that the processor 1710 executes the method described in the above method embodiment. The memory 1720 may be independent of the processor 1710 or integrated in the processor 1710.

The apparatus 1700 may further include a transceiver 1730. The processor 1710 may communicate with other devices or chips through the transceiver 1730. For example, the processor 1710 may transmit and receive data with other devices or chips through the transceiver 1730.

The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

The embodiment of the present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to the terminal or network device provided in the embodiment of the present application, and the program enables the computer to execute the method performed by the terminal or network device in each embodiment of the present application.

The embodiment of the present application also provides a computer program. The computer program can be applied to the terminal or network device provided in the embodiment of the present application, and the computer program enables a computer to execute the method executed by the terminal or network device in each embodiment of the present application.

It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application. The terms "first", "second", "third" and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions.

In the embodiments of the present application, the "indication" mentioned can be a direct indication, an indirect indication, or an indication of an association relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, B can be obtained through C; it can also mean that there is an association relationship between A and B.

In the embodiment of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and/or other information.

In the embodiments of the present application, the term "corresponding" may indicate that there is a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship of indication and being indicated, configuration and being configured, etc.

In the embodiments of the present application, "pre-definition" or "pre-configuration" can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in a device (for example, including a terminal device and a network device), and the present application does not limit the specific implementation method. For example, pre-definition can refer to what is defined in the protocol.

In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communication field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

In the embodiments of the present application, the term "and/or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.

In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a digital video disc (DVD)), or a semiconductor medium (e.g., a solid state disk (SSD)), etc.

The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

A method for sideline communication, comprising:

The terminal device selects or reselects resources from a first set of candidate resources for sidelink unlicensed spectrum transmission according to the first information;

The first information is associated with a first sideline transmission mode, and the first sideline transmission mode is continuous sideline transmission on multiple time domain resources.
The method as claimed in claim 1 is characterized in that the first information includes one or more of the following information: second information indicating whether resource selection or resource reselection is for one time domain resource or multiple continuous time domain resources; third information for determining the resource to be reselected; fourth information indicating the number of time domain resources of multiple continuous time domain resources; fifth information indicating the number of hybrid automatic repeat request HARQ retransmissions of data to be transmitted; channel occupancy time COT information of the terminal device, cooperation information between user devices; and sideline discontinuous transmission SL DRX information of the receiving end; priority information; information of the first candidate resource set; listen-before-talk LBT result; the number of media access control protocol data units MAC PDU to be transmitted.
The method as claimed in claim 2 is characterized in that if the first information includes the second information, the second information is determined based on one or more of the following information: QoS requirements of the data to be transmitted; feedback information corresponding to the data to be transmitted; retransmission requirements of the data to be transmitted; priority of the data to be transmitted; sending configuration information corresponding to the data to be transmitted; and the data volume of the data to be transmitted.
The method as claimed in claim 2 is characterized in that if the first information includes the third information, the third information includes one or more of the following information: information of the target resource indicated for resource reselection; information of the target resource triggered for resource reselection; information of resources adjacent to the target resource in the time domain; information of resources in the resource group where the target resource is located; and information indicating the occupancy status of the target resource.
The method as claimed in claim 2 is characterized in that if the first information includes the fourth information, the fourth information is determined based on one or more of the following: the number of HARQ retransmissions of the data to be transmitted; the remaining COT duration of the terminal device; the data size of the data to be transmitted; the available time domain resources for the data to be transmitted; and the number of MAC PDUs to be transmitted.
The method as claimed in claim 2 is characterized in that, if the first information includes the fourth information, the fourth information is determined based on the first candidate resource set.
The method according to any one of claims 1-6 is characterized in that the first information is information carried by the MAC layer of the terminal device when instructing the physical layer of the terminal device to perform resource selection or resource reselection.
The method according to any one of claims 1-6 is characterized in that the first information is information reported by the physical layer of the terminal device to the MAC layer of the terminal device.
The method according to any one of claims 1 to 8, wherein the first information is used to perform one or more of the following operations:

The physical layer of the terminal device determines a first candidate resource set;

The MAC layer of the terminal device selects the multiple time domain resources from the first candidate resource set;

The terminal device determines a time domain resource for performing the resource reselection.
The method as claimed in claim 9 is characterized in that the first candidate resource set is determined based on the first information and the second candidate resource set, and the second candidate resource set is a candidate resource set obtained based on resource listening.
The method as described in any one of claims 1-10 is characterized in that the multiple time domain resources are multiple time slots, and/or the continuous side transmission is multiple continuous time slot transmission MCSt.
The method as described in any one of claims 1-11 is characterized in that the multiple time domain resources are used to transmit a data packet multiple times; or, the multiple time domain resources are used to transmit different multiple data packets.
A terminal device, comprising:

A processing unit, configured to select or reselect resources from a first set of candidate resources for sidelink unlicensed spectrum transmission according to the first information;

The first information is associated with a first sideline transmission mode, and the first sideline transmission mode is continuous sideline transmission on multiple time domain resources.
The terminal device as described in claim 13 is characterized in that the first information includes one or more of the following information: second information indicating whether resource selection or resource reselection is for one time domain resource or multiple continuous time domain resources; third information for determining the resource to be reselected; fourth information indicating the number of time domain resources of multiple continuous time domain resources; fifth information indicating the number of hybrid automatic repeat request HARQ retransmissions of data to be transmitted; channel occupancy time COT information of the terminal device, cooperation information between user devices; and sideline discontinuous transmission SL DRX information of the receiving end; priority information; information of the first candidate resource set; listen-before-talk LBT result; the number of media access control protocol data units MAC PDU to be transmitted.
The terminal device as described in claim 14 is characterized in that if the first information includes the second information, the second information is determined based on one or more of the following information: QoS requirements of the data to be transmitted; feedback information corresponding to the data to be transmitted; retransmission requirements of the data to be transmitted; priority of the data to be transmitted; sending configuration information corresponding to the data to be transmitted; and the data volume of the data to be transmitted.
The terminal device as described in claim 14 is characterized in that if the first information includes the third information, the third information includes one or more of the following information: information of the target resource indicated for resource reselection; information of the target resource triggered for resource reselection; information of resources adjacent to the target resource in the time domain; information of resources in the resource group where the target resource is located; information indicating the occupancy status of the target resource.
The terminal device as described in claim 14 is characterized in that if the first information includes the fourth information, the fourth information is determined based on one or more of the following: the number of HARQ retransmissions of the data to be transmitted; the remaining COT duration of the terminal device; the data size of the data to be transmitted; the available time domain resources for the data to be transmitted; and the number of MAC PDUs to be transmitted.
The terminal device as described in claim 14 is characterized in that if the first information includes the fourth information, the fourth information is determined based on the first candidate resource set.
The terminal device as described in any one of claims 13-18 is characterized in that the first information is information carried by the MAC layer of the terminal device when instructing the physical layer of the terminal device to perform resource selection or resource reselection.
The terminal device as described in any one of claims 13-18 is characterized in that the first information is information reported by the physical layer of the terminal device to the MAC layer of the terminal device.
The terminal device according to any one of claims 13 to 20, wherein the first information is used to perform one or more of the following operations:

The physical layer of the terminal device determines a first candidate resource set;

The MAC layer of the terminal device selects the multiple time domain resources from the first candidate resource set;

The terminal device determines a time domain resource for performing the resource reselection.
The terminal device as described in claim 21 is characterized in that the first candidate resource set is determined based on the first information and the second candidate resource set, and the second candidate resource set is a candidate resource set obtained based on resource listening.
The terminal device as described in any one of claims 13-22 is characterized in that the multiple time domain resources are multiple time slots, and/or the continuous side transmission is multiple continuous time slot transmission MCSt.
The terminal device as described in any one of claims 13-23 is characterized in that the multiple time domain resources are used to transmit a data packet multiple times; or, the multiple time domain resources are used to transmit different multiple data packets.
A terminal device, characterized in that it includes a transceiver, a memory and a processor, the memory is used to store programs, the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the terminal executes the method as described in any one of claims 1-12.
A device, characterized in that it comprises a processor, which is used to call a program from a memory so that the device executes the method as described in any one of claims 1 to 12.
A chip, characterized in that it comprises a processor for calling a program from a memory so that a device equipped with the chip executes a method as described in any one of claims 1 to 12.
A computer-readable storage medium, characterized in that a program is stored thereon, wherein the program enables a computer to execute the method according to any one of claims 1 to 12.
A computer program product, characterized in that it comprises a program, wherein the program enables a computer to execute the method according to any one of claims 1 to 12.
A computer program, characterized in that the computer program enables a computer to execute the method according to any one of claims 1 to 12.