CN116939864A

CN116939864A - Method and device for determining resources of side links

Info

Publication number: CN116939864A
Application number: CN202210335868.1A
Authority: CN
Inventors: 王婷; 苏宏家; 向铮铮; 何泓利; 卢磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2023-10-24

Abstract

The embodiment of the application provides a method and a device for determining resources of a side uplink, relates to the technical field of communication, and is used for solving the problems that when side transmission is performed through spectrum resources in an unlicensed frequency band, judgment on the occupation condition of resources is inaccurate and resource conflict is easy to occur when user equipment performs resource selection. The method may include: the user equipment determines channel occupation time COT, and receives sidestream control information SCI from a first device, wherein the SCI is used for indicating the first device to occupy a first time-frequency resource set; and according to the SCI, eliminating the candidate resources meeting the first condition from the candidate resource set in the COT to obtain a target resource set.

Description

Method and device for determining resources of side links

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for determining resources of a side uplink.

Background

With the development of wireless communication technology, today, higher data transmission requirements are being put on the fifth generation communication technology (the 5th Generation Mobile Communication Technology,5G) which is a New Radio (NR) system. Communication between User Equipments (UEs) is called Sidelink (SL), and in NR, the SL resource allocation scheme includes a mode 1 and a mode 2. Wherein, mode 1 is resource scheduling by the base station, and mode 2 is resource selection by the UE autonomously. Specifically, in mode 2, the UE may exclude resources reserved and occupied by other UEs through a Sensing (Sensing) process in a configured resource pool, and then select some appropriate resources for SL transmission; after the selection of resources, the UE may send or retransmit data on these selected resources until a resource reselection is triggered.

In a wireless communication system, the frequency bands can be divided into an authorized frequency band and an unauthorized frequency band according to the difference of the frequency bands, wherein the UE can use the spectrum resources in the authorized frequency band based on the scheduling of the network equipment, and the UE needs to use the spectrum resources in a competitive mode for the unauthorized frequency band. For example, the UE may acquire a period of Channel Occupation Time (COT) of the partial spectrum resource in the unlicensed band through a listen before talk (listen before talk, LBT) mechanism. Specifically, the UE may use energy-based detection to confirm that the spectrum resource is in idle state after the cog is in idle state for a period of time, and use the spectrum resource to send data, and release the channel after the cog is finished.

Currently, when SL transmission is performed through spectrum resources in an unlicensed band, an LBT mechanism may be combined with a mode 2 resource selection manner, for example, a plurality of UEs are simultaneously accessed to an LBT as a group, and share a channel COT, and the plurality of UEs in the group allocate spectrum resources in the COT by adopting the mode 2 resource selection method. However, when the UE performs the candidate resource exclusion according to the monitored resource reservation information in the Sensing process, the resource reservation information cannot be monitored due to the fact that other UEs have no available COT, so that misjudgment of the resource reservation information among the UEs in the group may occur, and resource conflict may occur.

Illustratively, UE1 listens to candidate resource R during Sensing _x，y If the resource reservation slot of (1) is not the one closest to the one for which UE1 triggered the resource selection slot, then UE1 considers that the candidate resource is no longer reserved and occupied by other UEs, thereby selecting the resource R _x，y And carrying out data transmission. But in fact UE2 periodically occupies the candidate resource R _x，y UE2 cannot make a reservation of resources due to no available COT, so that resource collision may occur with UE1 when the resources are subsequently used.

Disclosure of Invention

The embodiment of the application provides a method and a device for determining resources of a side link, which are used for solving the problems that when side transmission is carried out through spectrum resources in an unlicensed frequency band, judgment on the occupation condition of the resources is inaccurate when user equipment selects the resources, and resource conflict is easy to occur, and improving the utilization rate of the spectrum resources.

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

in a first aspect, a method for determining resources of a side uplink is provided, the method including: determining the channel occupation time COT; receiving side control information SCI from a first device, the SCI being used to instruct the first device to occupy a first set of time-frequency resources, the first set of time-frequency resources including [ R _x，y ，R _x，(y+P1) ...R _{x，(y+q×P1)} ]Wherein x represents the time-frequency resource R _x，y Y represents the time-frequency resource R _x，y Q×p1 represents an offset value in the time domain, q is a natural number, and P1 represents a time domain period; in accordance with the above-mentioned SCI,candidate resources meeting the first condition are eliminated from a second time-frequency resource set to obtain a target resource set, wherein the second time-frequency resource set comprises resource selection windows [ n+T1, n+T2 ]]At least one candidate resource within; the second time-frequency resource set is the resource selection window [ T3, T3+D ]]In the time-frequency resource set, T3 represents the starting time of the COT, D represents the time length of the COT, T1 is related to the subcarrier interval, T2 is related to the delay budget of the data packet to be sent, and n is the time when the high-level issuing parameter triggers the resource selection; wherein the candidate resources satisfying the first condition include: the first time-frequency resource set and the third time-frequency resource set have an intersection; wherein the third set of time-frequency resources comprises [ R ] _a，b ，R _a，(b+P2) …R _{a，(b+j×P2)} ]Wherein a represents the time-frequency resource R _a，b B represents the time-frequency resource R _a，b J×p2 represents an offset value in the time domain, j is a natural number, and P2 represents a period of data to be transmitted.

In one possible implementation manner, the SCI further includes first indication information, where the first indication information is used to indicate whether a time-frequency resource occupied by the SCI is a last time-frequency resource of the SCI periodically sent in the COT corresponding to the first device.

In one possible implementation, the candidate resources satisfying the first condition further include: the first indication information in the SCI indicates that the time-frequency resource occupied by the SCI is the last time-frequency resource of the SCI periodically sent in the COT corresponding to the first device.

In one possible implementation, the candidate resources satisfying the first condition further include: the q is less than or equal to a first threshold.

In one possible implementation, the method further includes: and receiving second indication information, wherein the second indication information is used for indicating the first threshold value.

In one possible implementation manner, the SCI further includes third indication information, where the third indication information is used to indicate whether the first apparatus subsequently occupies the first set of time-frequency resources.

In one possible implementation, the candidate resources satisfying the first condition further include: at least one time-frequency resource R preceding said n time instants _{x，(y+q×P1)} And the third indication information for indicating that the first time-frequency resource set is not occupied any more is not received.

In a second aspect, a method for determining resources of a side uplink is provided, the method including: determining to occupy a fourth set of time-frequency resources, the fourth set of time-frequency resources comprising [ R ] _x，y ，R _x，(y+P1) …R _{x，(y+q×P1)} ]Wherein x represents frequency domain information of the time-frequency resource, y represents time domain information of the time-frequency resource, q×p1 represents an offset value in a time domain, q is a natural number, and P1 represents a time domain period; determining the channel occupation time COT; if the target resource is out of the COT, re-selecting the resource in the COT; wherein the target resource is R in the fourth time-frequency resource set _{x，(y+N×P1)} N is a positive integer.

In one possible implementation manner, the resource selection is performed again in the COT, which specifically includes: determining a fifth set of time-frequency resources within the COT, wherein the fifth set of time-frequency resources comprises [ R ] _c，d ，R _c，(d+P1) …R _{c，(d+q×P1)} ]Wherein c represents frequency domain information of the time-frequency resource, d represents time domain information of the time-frequency resource, q×p1 represents an offset value in a time domain, q is a natural number, and P1 represents a time domain period; and transmitting side control information SCI, wherein the SCI is used for indicating to occupy the fifth time-frequency resource set.

In a third aspect, a communication device is provided, where the communication device includes a processing module and a transceiver module, where the processing module is configured to determine a channel occupation time COT; the transceiver module is configured to receive side control information SCI from a first device, where the SCI is configured to instruct the first device to occupy a first set of time-frequency resources, and the first set of time-frequency resources includes R _x，y ，R _x，(y+P1) …R _{x，(y+q×P1)} ]Wherein x represents the time-frequency resource R _x，y Is the frequency domain information of (a), y represents the timeFrequency resource R _x，y Q×p1 represents an offset value in the time domain, q is a natural number, and P1 represents a time domain period; the processing module is further configured to exclude candidate resources satisfying the first condition from a second time-frequency resource set according to the SCI, to obtain a target resource set, where the second time-frequency resource set includes a resource selection window [ n+t1, n+t2 ]]At least one candidate resource within; the second time-frequency resource set is the resource selection window [ T3, T3+D ]]In the time-frequency resource set, T3 represents the starting time of the COT, D represents the time length of the COT, T1 is related to the subcarrier interval, T2 is related to the delay budget of the data packet to be sent, and n is the time when the high-level issuing parameter triggers the resource selection; wherein the candidate resources satisfying the first condition include: the first time-frequency resource set and the third time-frequency resource set have an intersection; wherein the third set of time-frequency resources comprises [ R ] _a，b ，R _a，(b+P2) …R _{a，(b+j×P2)} ]Wherein a represents the time-frequency resource R _a，b B represents the time-frequency resource R _a，b J×p2 represents an offset value in the time domain, i is a natural number, and P2 represents a period of data to be transmitted.

In a possible implementation manner, the transceiver module is further configured to receive second indication information, where the second indication information is used to indicate the first threshold value.

In a possible implementation manner, the SCI further includes third indication information, where the third indication information is used to indicate whether the first apparatus subsequently occupies the first set of time-frequency resources.

In a fourth aspect, a communication apparatus is provided that includes a processing module configured to determine to occupy a fourth set of time-frequency resources, the fourth set of time-frequency resources including [ R _x，y ，R _x，(y+P1) …R _{x，(y+q×P1)} ]Wherein x represents frequency domain information of the time-frequency resource, y represents time domain information of the time-frequency resource, q×p1 represents an offset value in a time domain, q is a natural number, and P1 represents a time domain period; the processing module is also used for determining the channel occupation time COT; if the target resource is out of the COT, re-selecting the resource in the COT; wherein the target resource is R in the fourth time-frequency resource set _{x，(y+N×P1)} N is a positive integer.

In a possible implementation manner, the processing module is further configured to determine a fifth set of time-frequency resources within the COT, where the fifth set of time-frequency resources includes [ R _c，d ，R _c，(d+P1) …R _{c，(d+q×P1)} ]Wherein c represents frequency domain information of the time-frequency resource, d represents time domain information of the time-frequency resource, q×p1 represents an offset value in a time domain, q is a natural number, and P1 represents a time domain period; the communication device further comprises a transceiver module configured to send sidestream control information SCI, where the SCI is configured to instruct to occupy the fifth set of time-frequency resources.

In a fifth aspect, a communication device is provided, the communication device comprising a processor and a transmission interface; wherein the processor is configured to execute instructions stored in a memory to cause the apparatus to perform the method of any one of the first aspects above.

In a sixth aspect, a communication device is provided, the communication device comprising a processor and a transmission interface; wherein the processor is configured to execute instructions stored in a memory to cause the apparatus to perform the method of any one of the second aspects above.

In a seventh aspect, there is provided a computer readable storage medium comprising a program or instructions which, when executed by a processor, performs the method of any of the first aspects above.

In an eighth aspect, there is provided a computer readable storage medium comprising a program or instructions which, when executed by a processor, performs the method of any of the second aspects above.

In a ninth aspect, there is provided a computer program product which, when run on a computer or processor, causes the computer or processor to perform the method of any of the first aspects above.

In a tenth aspect, there is provided a computer program product which, when run on a computer or processor, causes the computer or processor to perform the method of any of the second aspects above.

It will be appreciated that any of the above-provided methods for determining resources of a side uplink, the communication device, the computer-readable storage medium or the computer program product, etc. may be implemented by the corresponding methods provided above, and therefore, the advantages achieved by the methods may refer to the advantages provided in the corresponding methods and are not repeated herein.

Drawings

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application;

fig. 2A is a schematic diagram of a candidate time-frequency resource set according to an embodiment of the present application;

fig. 2B is a schematic diagram of resource interception and resource selection according to an embodiment of the present application;

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

fig. 4 is a flow chart of a method for determining resources of a side uplink according to an embodiment of the present application;

fig. 5-7 are schematic diagrams one to three of resource interception and resource selection according to an embodiment of the present application;

Fig. 8 to fig. 9 are schematic flow diagrams of another method for determining resources of a side uplink according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

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

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

In order to facilitate understanding of the present application, related concepts related to the embodiments of the present application will now be described.

The 5G communication technology is the latest generation of cellular mobile communication technology, and is an extension of the fourth generation mobile communication technology, the third generation mobile communication technology and the second generation mobile communication technology. The performance goals of 5G are high data rates, reduced latency, energy savings, reduced cost, increased system capacity, and large-scale device connectivity.

Communications between UEs involved in a communication system are widely known as Sidelink (SL) communications. For example, the side links may include side transmissions in an in-vehicle wireless communication system, or side transmissions in a Device-to-Device (D2D) communication system.

The UE may be a mobile phone (mobile phone), a tablet (Pad), a computer with a wireless transceiving function, a vehicle-mounted terminal, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned (self driving), a wireless terminal in telemedicine (remote media), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), a terminal device in a 5G network or a terminal device in a future evolved public land mobile communication network (public land mobile network, PLMN), an on-board Unit (OBU), a vehicle-mounted box (also referred to as vehicle-mounted T-Box (telematics box)), a roadside Unit (Road Side Unit), a whole car, an intelligent vehicle, or a device or a chip or chip capable of realizing the foregoing functions, etc. The embodiment of the application does not limit the application scene.

The methods and steps implemented by the UE in the present application may also be implemented by a component (e.g., a chip or a circuit) or the like that may be used for the UE. In the present application, the UE and a component (e.g., a chip or a circuit) that can be provided in the UE may also be referred to as a terminal device or a terminal.

In an embodiment of the present application, the terminal device or the network device may include a hardware layer, an operating system layer running above the hardware layer, and an application layer running above the operating system layer. The hardware layer includes hardware such as a central processing unit (central processing unit, CPU), a memory management unit (memory management unit, MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processes through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address book, word processing software, instant messaging software and the like. Further, the embodiment of the present application is not particularly limited to the specific structure of the execution body of the method provided by the embodiment of the present application, as long as the communication can be performed by the method provided according to the embodiment of the present application by running the program recorded with the code of the method provided by the embodiment of the present application, and for example, the execution body of the method provided by the embodiment of the present application may be a terminal device or a network device, or a functional module in the terminal device or the network device that can call the program and execute the program.

Fig. 1 shows an example of a communication system to which the embodiment of the present application is applied, including a V2X communication system, a D2D communication system, and the like. As shown in fig. 1, the sidestream communication system may include: SL communication between the in-vehicle terminal and the in-vehicle terminal (Vehicle to Vehicle, V2V), SL communication between the in-vehicle terminal and the roadside infrastructure (Vehicle to Infrastructure, V2I), SL communication between the in-vehicle terminal and the pedestrian (Vehicle to Pedestrian, V2P), communication between the terminal devices with energy saving requirements, communication between the pedestrian and the in-vehicle terminal, communication between the pedestrian and the pedestrian, and uplink and downlink communication between the in-vehicle terminal and the network device (Vehicle to Network, V2N), and the like. The D2D communication system includes SL communication between the terminal 1 and the terminal 2.

In addition, the application can be applied to a system for directly communicating between terminals such as V2X, D D and the like, and is also applicable to communication scenes with network coverage and without network coverage, and a user selects a mode of resources autonomously. The terminal may be within the coverage area of the network device, or may be outside the coverage area of the network device, which is not specifically limited in the present application.

A SL resource pool comprises a plurality of continuous sub-channels in the frequency domain, and the unit of the time domain is SL time slot. Each sub-channel contains equal number of resource blocks (physical resource block, PRB), and the specific value is configured by a high layer to the resource pool. One SL slot is located within one slot (slot) in the time domain, occupies a continuous plurality of symbols (symbols), and the starting symbol position (start symbol) of the SL slot and the number of occupied continuous symbols (slsymbol length) are configured by a higher layer. The time domain starting position and the number of time duration symbols of all the SL slots in one resource pool are the same. SL physical channels that may be transmitted over SL time slots include a side physical shared channel (Physical Sidelink Shared Channel, PSSCH), a side physical broadcast channel (Physical Sidelink Broadcast Channel, PSBCH), a side physical broadcast channel (Physical Sidelink Control Channel, PSCCH), and a side physical feedback channel Physical Sidelink Feedback Channel, PSFCH.

Wherein, PSSCH is used for carrying data information and second control information. Wherein the data information is service information from terminal device to terminal device. The second control information is mainly used for bearing other control information except demodulation reference signals (Demodulatin Reference Signal, DMRS) of the PSSCH, and specifically may include information such as channel state information (channel state information, CSI) reporting trigger information, an ID of a destination user of the PSSCH, a PSSCH HARQ process number, a new data transmission instruction (new data indicator), and a HARQ transmission version number. The format of the second control information is different according to the type of the service information. The PSSCH transmission needs to be transmitted along with its corresponding one of the PSCCHs.

The PSCCH is used to carry control information, which may be referred to as first control information, including physical layer resource information of side-row data channels, DMRS configuration information, DMRS port numbers, coded modulation signals (modulation and code signal, MCS), and resource reservation information.

The resource reservation information is used for indicating the interval between the time domain position of the resource used for transmitting PSSCH/PSCCH by the user in the future and the time slot where the current PSSCH/PSCCH is positioned. Typically, the first control information includes two reserved resources, one is a primary transmission for other Transport Blocks (TBs), including periodic resource reservation information; the other is the information of the retransmission resource of the current PSSCH/PSCCH. Other users can judge the use condition of the resources in the resource selection window according to the resource reservation information in the correctly received first control information in the resource listening window, such as whether a certain candidate resource in the resource selection window is reserved by other users. The allocation mode based on resource reservation can improve the reliability of resource use in the distributed system and reduce collision.

The resource allocation scheme of the NR SL comprises a Mode 1 and a Mode 2. The Mode 1 is used for scheduling resources for the terminal according to the side transmission requirement of the terminal, and the Mode 2 is used for autonomously selecting the resources by the terminal.

In the user-selected resource Mode (Mode 2), the transmission resources of the UE are independent of the network device, and the UE selects the transmission resources for communication. The mode is not limited to network coverage and the UE may communicate with the mode without network coverage. The sending UE may select transmission resources for communication in the resource selection window according to the result of self-resource interception in the interception window, where the UE may also be referred to as interception UE, or receiving UE (UE receiving resource reservation information); correspondingly, the UE that transmits the resource reservation information may be simply referred to as a transmitting UE. This will not be repeated in the following.

The set of slots of the SL resource pool may beAssuming that the listening UE triggers the resource selection in time slot n, the listening UE continuously listens to all the time slots belonging to the SL resource pool in the window except for the time slots transmitted by the listening UE itself. And then, according to the interception result, the resources reserved by other UE are excluded from the resource selection window, and the specific resource exclusion flow is as follows:

(1) The UE determines a resource selection window.

For example, if the UE triggers a procedure for resource selection in time slot n, the resource selection window may be determined to be time interval [ n+t1, n+t2].

Wherein, T1 is fullFoot support Is determined according to the subcarrier spacing (subcarrier spacing)>In units of time slots. The subcarrier spacing of SL is different, corresponding +.>The values are different and +.Can be obtained according to Table 1 below>Is a value of (a). The value of T2 satisfies T _2min T2. Ltoreq.residual packet delay budget (Packet Delay Budget, PDB), where T _2min Is related to the priority value of the data, T _2min May be 1,5, 10, 20 time slots.

Table 1 determination from subcarrier spacingValue of

Illustratively, the priority value of the data is an integer from 1 to 8, with smaller values representing higher priority levels of the data. Different priority values may correspond to different T _2min 。

The Sensing procedure of Mode 2 UE may be triggered by a higher layer of the UE. For example, the triggering process of Sensing may specifically be that the application layer of the UE sends a request to the physical layer by layer according to the requirement of the UE for sending a service. The medium access control (Media Access Control, MAC) layer triggers a Sensing procedure to the physical layer to ask the UE's physical layer to determine a candidate set of resources. So that higher layers of the UE can determine the time-frequency resources for transmitting the PSCCH or PSSCH in this candidate set of resources.

The following parameters for PSSCH or PSCCH transmission may be provided when the higher layer of the UE triggers the Sensing procedure: the resource pool for resource selection, the priority of the PSSCH or PSCCH transmission data, the remaining packet delay budget (Packet Delay Budget, PDB), and the number of sub-channels for PSCCH or PSSCH transmission. In one embodiment, the parameters provided by the higher layer of the UE may further include a resource reservation interval, which may be in units of milliseconds or time slots.

(2) The UE determines a candidate resource set S under a resource selection window according to the resource pool _A 。

Wherein the candidate resource set S _A Including a plurality of candidate slot resources. For example, a candidate slot resource corresponds to any L consecutive sub-channel sets that the UE includes in one slot of the resource pool, i.e., a single slot resource can be denoted as R _x，y ，R _x，y Represented as a set of consecutive L subchannels in time slot y, where the index of the subchannels is x+j, respectively, where j may have a value of 0, 1.

For example, as shown in fig. 2A, the process of determining the candidate time-frequency resource set may be that L is 2, the number of subchannels corresponding to the resource pool is 6, and the indexes of the subchannels are (0, 1,2,3,4, 5), and then it may be determined that 5 resources including single time slot resources with indexes of (0, 1), (1, 2), (2, 3), (3, 4), (4, 5) are included in the candidate resource set. Will candidate resource set S _A The total number of candidate video resources is denoted as M.

(3) The UE determines a resource listening window.

Wherein the resource listening window (Sensing window) is a time intervalWherein T is ₀ Is configured by radio resource control (Radio Resource Control, RRC) signaling, and may be specifically configured by a higher layer parameter t0_sensing window. />Is determined according to the subcarrier spacing +.>In units of time slots. The subcarrier spacing of SL is different, corresponding +.>The values are different and +.Can be obtained according to Table 2 below>Is a value of (a).

Table 2 determination from subcarrier spacingValue of

(4) Defining a threshold TH corresponding to the reference signal received power (Reference Signal Received Power, RSRP) _{prioTX，prioRX} And a function for indicating the priority corresponding to the data indicated in the received SCI and the priority corresponding to the data to be transmitted of the transmitting UE. When the RSRP value of the energy detection corresponding to the interception resource is larger than TH _{prioTX，prioRX} And the reserved resources corresponding to the interception resources need to be eliminated.

(5) If candidate resource R _x，y While satisfying the following conditions, the UE may then select the candidate resource R _x，y From the candidate resource set S _A Excluding:

1. the UE does not listen to the time slotI.e. the UE itself is in slot->Data transmission is performed.

2. With the integer jSatisfy y+j×P' _{rsvp_TX} ＝m+q×P′ _{rsvp_RX} . Where q=1, 2, where, Q, j=0, 1, C _resel -1，P′ _{rsvp_TX} Physical period for transmitting UECorresponding logic period, P' _{rsvp_RX} Physical period of receiving UE indicated for higher layer parameter sl-resource reservation list +.>Corresponding logic period C _resel The period of the high-layer configuration is P' _{rsvp_TX} The number of resource periods to be reserved. Wherein if P _{rsvp_RX} ＜T _scal And n '-m is less than or equal to P' _{rsvp_RX} ，/>Otherwise, q=1.

That is, candidate resource R _x，y The met condition is that the sending time slot m of the resource reservation information is one-time resource reservation information which is received by the receiving UE and is closest to the time slot n. For example, if the receiving UE receives the resource reservation information from other UEs in other time slots, such as time slot x, before time slot n after time slot m, the receiving UE does not consider the resource reservation information corresponding to time slot m, but only considers the resource reservation information corresponding to time slot x when performing resource elimination.

Wherein, if the slot n belongs to the SL resource pool,otherwise->For the first slot belonging to the SL resource pool after slot n, T _scal Selecting window length T for a resource ₂ -T ₁ The corresponding interval is in ms.

(6) If candidate resource R _x，y At the same time, the UE can apply the following conditionsCandidate resource R _x，y From the candidate resource set S _A Excluding:

1. the UE is in a slotReceiving SCI and decoding P _{rsvp_RX} And prio _RX Wherein P is _{rsvp_RX} And prio _RX Physical period and priority for the PSSCH to which the SCI corresponds.

2. RSRP measurement of PSSCH or PSCCH determined by the SCI is above threshold Th _{prioTX，proRX} 。

3. By time slotsThe received SCI-determined time-frequency resource and when field "Resource reservation period" is present, it is expected to be +.>Time-frequency resource and candidate resource determined by SCI received by time slotAnd (5) overlapping. Wherein if P _{rsvp_RX} ≤T _scal And n '-m is less than or equal to P' _{rsvp_RX} Then->Otherwise, q=1.

Wherein, if the slot n belongs to the SL resource pool,otherwise->Is the first slot belonging to the SL resource pool after slot n. T (T) _scal Selecting window length T for a resource ₂ -T ₁ The corresponding interval is in ms. The description herein applies equally to the subsequent embodiments, and the description thereof will not be repeated.

Exemplary, as shown in fig. 2B, the receiving UE receives the SCI at m time instants in the listening window, where n time instants are time instants when the receiving UE performs resource selection, and according to the above-mentioned resource exclusion process, the receiving UE reserves the resource according to the resource reservation information carried by the SCI, and segments the reserved resource and the candidate resource R in the resource selection window _x，y Coincidence, the candidate resource R can be determined _x，y From the candidate resource set S _A Excluding from the middle.

(7) When the UE determines the candidate resource set S _A The residual candidate resources in the method are less than X% of M, and a preset RSRP threshold Th can be set _{prioTX，prioRX} The rise is 3dB and the previous steps are repeated. Wherein, X% may be set to 20%, 35%, 50%, etc.

After interception UE excludes candidate resources meeting the conditions, the updated candidate resource set S is obtained _A Reporting to the higher layer, and the higher layer then transmits the candidate resource set S _A And (3) finishing final target resource selection for data transmission.

As can be seen from the above description, during Sensing, the listening UE, for example, UE1, uses the resource reservation slot that is the closest to the trigger resource selection slot n and is detected as the condition for determining whether the candidate resource needs to be excluded, if the candidate resource R _x，y If the corresponding resource reservation time slot is not one resource reservation closest to the trigger resource selection time slot n of the UE1, the UE1 considers that the candidate resource is not reserved and occupied by other UEs any more, thereby selecting the resource R _x，y And carrying out data transmission.

However, in the case that the UE uses the unlicensed band for SL communication, the LBT mechanism may be combined with the Mode2 to perform resource selection, specifically, a channel occupation time (Channel occupancy time, COT) of the partial spectrum resource in the unlicensed band is obtained through the LBT mechanism, and then the Mode2 is combined to perform resource exclusion. Therefore, according to the above condition for eliminating resources, when the UE eliminates candidate resources according to monitored resource reservation information in the Sensing process, the resource reservation information cannot be monitored due to the fact that other UEs have no available COT, so that misjudgment of the resource reservation information between UEs in the SL group is caused, and resource conflict occurs.

Illustratively, in combination with the foregoing examples, the UE2 periodically occupies the candidate resource R _x，y UE2 cannot make a resource reservation due to no available COT, while UE1 is based on candidate resources R _x，y The corresponding resource reservation time slot is not the one-time resource reservation closest to the trigger resource selection time slot n of the UE1, and the candidate resource R is possibly occupied _x，y So that the subsequent UE2 uses the resource R _x，y Resource conflicts may occur with UE 1.

In order to solve the above problems, an embodiment of the present application provides a method for determining resources on a side uplink, by optimizing a resource exclusion condition in a resource selection process, in a scenario in which a UE uses an unlicensed band to perform SL communication, it may be determined whether resource reservation information is not detected at a time closest to a resource selection slot in a resource listening window, because current resources are not occupied, or other UEs do not transmit resource reservation information due to no COT, thereby avoiding resource conflict occurring in the subsequent process due to no reception of resource reservation information due to no COT, and improving resource utilization.

In addition, the communication apparatus in fig. 1 in the embodiment of the present application may be a functional module in a device, may be a network element in a hardware device, for example, a communication chip in a mobile phone, may be a software function running on dedicated hardware, or may be a virtualized function instantiated on a platform (for example, a cloud platform).

The communication device of fig. 1 may be implemented by the communication device 300 of fig. 3. Fig. 3 is a schematic diagram of a hardware configuration of a communication device applicable to an embodiment of the present application. The communication device 300 comprises at least one processor 301, communication lines 302, a memory 303 and at least one communication interface 304.

The processor 301 may be a general purpose central processing unit (central processing unit, CPU), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the programs of the present application.

Communication line 302 may include a pathway to transfer information between the aforementioned components, such as a bus.

Communication interface 304, using any transceiver-like device for communicating with other devices or communication networks, such as an ethernet interface, a RAN interface, a wireless local area network (wireless local area networks, WLAN) interface, etc.

The memory 303 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), a compact disc read-only memory (compact disc read-only memory) or other optical disc storage, a compact disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be stand alone and be coupled to the processor via communication line 302. The memory may also be integrated with the processor. The memory provided by embodiments of the present application may generally have non-volatility. The memory 303 is used for storing computer-executable instructions related to executing the scheme of the present application, and is controlled by the processor 301 to execute the instructions. The processor 301 is configured to execute computer-executable instructions stored in the memory 303, thereby implementing the method provided by the embodiment of the present application.

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

In a particular implementation, as one embodiment, processor 301 may include one or more CPUs, such as CPU0 and CPU1 of FIG. 3.

In a particular implementation, as one embodiment, the communication apparatus 300 may include a plurality of processors, such as the processor 301 and the processor 307 in fig. 3. Each of these processors may be a single-core (single-CPU) processor or may be a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

In a specific implementation, as an embodiment, the communication apparatus 300 may further include an output device 305 and an input device 306. The output device 305 communicates with the processor 301 and may display information in a variety of ways. For example, the output device 305 may be a liquid crystal display (liquid crystal display, LCD), a light emitting diode (light emitting diode, LED) display device, a Cathode Ray Tube (CRT) display device, or a projector (projector), or the like. The input device 306 is in communication with the processor 301 and may receive user input in a variety of ways. For example, the input device 306 may be a mouse, keyboard, touch screen device, or sensing device, among others.

The communication apparatus 300 may be a general-purpose device or a special-purpose device. In a specific implementation, the communication apparatus 300 may be a portable computer, a network server, a palm top computer (personal digital assistant, PDA), a mobile handset, a tablet computer, a wireless terminal, an embedded device, or a device having a similar structure as in fig. 3. The embodiment of the present application is not limited to the type of communication device 300.

The following describes a communication method provided by the embodiment of the present application in detail.

An embodiment of the present application provides a method for determining resources of a side uplink, as shown in fig. 4, which includes the following steps.

401: the UE receives the SCI.

Wherein, as can be seen from the foregoing, the UE can listen to the window in the determined resourceAnd monitoring the SCI to judge the use condition of the resources in the resource selection window according to the reservation information of the resources in the SCI.

Wherein the UE receives at least one SCI within the resource listening window, the SCI may include resource reservation information for indicating occupation of the first set of time-frequency resources.

Concrete embodimentsThe UE may receive SCI from other communication devices at time m, wherein the SCI includes resource reservation information therein. For example, the UE receives an SCI from the first device, and the SCI includes resource reservation information for indicating to occupy the first set of time-frequency resources. Alternatively, the moment when the UE receives the SCI can also be expressed as in the resource listening window Time slots.

Wherein the first set of time-frequency resources may include [ R ] _x，y ，R _x，(y+P1) ...R _{x，(y+q×P1)} ...]. I.e. the first set of time-frequency resources comprises at least one time-frequency resource R _{x，(y+q×P1)} Where x represents frequency domain information of time-frequency resources, y represents time domain information of time-frequency resources, q×p1 represents an offset value in the time domain, q is a natural number, and P1 represents a time domain period.

Illustratively, the first set of time-frequency resources is { R _x，y ，R _x，(y+P1) ，R _x，(y+2P1) ，R _x，(y+3P1) ，.....，R _{x，(y+q×P1)} ,......}. Where Q is a natural number, q=0, 1, 2. The receiving UE does not sense the period range repeatedly occupied by the UE sending SCI for the time-frequency resource, i.e. the value of Q. The maximum value Q of the repeated occupied time-frequency resource may be determined by a preconfigured manner, for example.

Therefore, the UE receives the SCI, and can acquire the time-frequency resource information occupied or about to be occupied by other UEs according to the resource reservation information in the SCI.

402: the UE determines a channel occupation time COT.

When the UE side needs to determine the time-frequency resource of the data to be transmitted at the service arrival time, for an unlicensed frequency band, the UE can judge that part of spectrum resources in the unlicensed frequency band are in a idle state in a certain period of time according to an LBT mechanism, and then can determine COT of the spectrum resources and occupy the COT.

Specifically, when the UE accesses an unlicensed band, energy-based detection may be used to determine whether a channel of the spectrum resource is idle. The method comprises the steps that a corresponding detection threshold is set based on energy detection, and when UE detects that the channel energy reaches or exceeds a preset detection threshold, the UE determines that the channel is busy, and access is not allowed; and when the UE detects that the channel energy is lower than a preset detection threshold, determining that the channel is idle, and allowing access.

The specific process of accessing the UE to the channel of the unlicensed band and acquiring the channel occupation time COT may refer to the existing related description, which is not specifically limited in the present application.

403: and the UE excludes the candidate resources meeting the first condition from the second time-frequency resource set according to the SCI to obtain a target resource set.

Wherein the second set of time-frequency resources includes at least one candidate resource within a resource selection window [ n+t1, n+t2 ]. The resource selection window is used for carrying out resource selection according to the SL resource pool in a time slot of the resource selection window by the UE after triggering the resource selection, and determining the transmission resource of the data to be transmitted.

For example, the first candidate resource may be included in the second set of time-frequency resources.

The second time-frequency resource set is a time-frequency resource set of the resource selection window in the COT, wherein the COT can be specifically a time interval [ T3, T3+D ], T3 is used for indicating the starting time of the COT, D is used for indicating the time length of the COT, T1 is related to a subcarrier interval, T2 is related to a delay budget of a data packet to be sent, and n is the time when a high-level issuing parameter triggers the resource selection.

That is, the second time-frequency resource set is the intersection of the resource selection window and [ T3, t3+d ], that is, the second time-frequency resource set is the time-frequency resource set corresponding to the intersection of the COT and the candidate resource set in the time domain.

Wherein the first candidate resource R satisfies the first condition _a，b Comprising the following steps: the first set of time-frequency resources has an intersection with the third set of time-frequency resources. Wherein the third set of time-frequency resources may comprise at least one time-frequency resource R _{a，(b+j×P2)} Wherein a represents frequency domain information of time-frequency resource, b represents time domain information of time-frequency resource, mxP 2 represents offset value in time domain, j is selfHowever, P2 represents a period of data to be transmitted corresponding to the UE.

Exemplary, the third set of time-frequency resources is { R _a，b ，R _a，b+P2 ，R _a，b+2P2 ，R _a，b+3P2 ，......，R _a，b+j×P2 ,......}. Wherein j=0, 1,2,.. _resel-1 。

Exemplary, the first candidate resource is R _a，b That is, satisfying the first condition includes: at least one time-frequency resource of the first set of time-frequency resources and a first candidate resource R _a，b Overlapping, or repeating the time-frequency resource R of at least one period P2 with the first candidate resource _{a，(b+j×p2）} There is an overlap, where P2 is the period of the data to be transmitted corresponding to the UE.

That is, the UE transmits data according to m slots (slots) The received SCI can be expected to be at time m+qXP1 (+.>Time slot) received time-frequency resource corresponding to SCI and candidate resource R _a，b+j×P2 At this time, b+j×p2=y+q×p1.

The above P1 may be represented as P' _{rsvp_TX} I.e. physical period P of data transmitted by UE side for transmitting SCI indication _{rsvp_TX} Corresponding logic cycles. The above P2 may be represented as P' _{rsvp_RX} I.e. the physical period P of the data to be transmitted corresponding to the receiving UE side receiving the SCI indication _{rsvp_RX} The corresponding logic period.

The physical period may be a period in units of milliseconds (ms), and the logical period may be a period after conversion according to the physical period and a certain conversion rule. For example, the conversion rule may be the formula:wherein T' _max Is the number of time slots contained in the resource pool.

In a specific embodiment, the condition that the UE performs resource exclusion may further include that the first condition is satisfied and that the other exclusion conditions (1 and 2) in step (6) of the foregoing resource exclusion procedure are simultaneously satisfied, and then the resource exclusion is performed.

In the above embodiment, by optimizing the condition of the UE for resource exclusion, the transmission time slot m of the resource reservation information is not limited to the primary resource reservation information of the closest time slot n received by the receiving UE, so as to avoid the problem of resource conflict caused by the fact that the resource reservation information cannot be transmitted due to the fact that no COT is available.

In one embodiment, specific indication information may be added to the SCI to indicate to the receiving UE whether the reserved resource to be periodically occupied by the UE sending the SCI is likely to be in a period of no available COT, so that the receiving UE may determine, according to the indication information in the received SCI, whether the UE may subsequently be unable to send the SCI of the reserved resource due to no COT, and further perform resource exclusion to avoid subsequent resource collision.

In this embodiment, the SCI received in step 402 may further include first indication information, where the first indication information is used to indicate whether the time-frequency resource occupied by the SCI is the last time-frequency resource of the SCI periodically sent in the COT corresponding to the first device.

That is, the transmitting UE may inform the receiving UE whether the time-frequency resource occupied by the SCI is the last time-frequency resource of the periodically transmitting SCI within the COT of the transmitting UE through the first indication information in the SCI.

Specifically, if the first indication information indicates that the SCI is the last time-frequency resource of the periodically transmitted SCI in the COT of the transmitting UE, the subsequent transmitting UE continues to periodically occupy the resource but cannot transmit the SCI due to being out of the COT, so that the receiving UE may exclude the candidate resource according to the first indication information in the SCI when determining that the periodic time-frequency resource occupied by the SCI overlaps with the candidate resource or the time-frequency resource periodically repeated by the candidate resource, so as to avoid resource collision.

Conversely, if the first indication information indicates that the SCI is not the last time-frequency resource of the periodically transmitting SCI within the COT of the transmitting UE, that is, the subsequent transmitting UE continues to periodically occupy the resource, the SCI may continue to be transmitted within the COT. Therefore, according to the first indication information in the SCI, when it is determined that the periodic time-frequency resource occupied by the SCI overlaps with the candidate resource or the time-frequency resource periodically repeated by the candidate resource, and the receiving UE receives the SCI, then other SCIs that do not receive the reserved resource any more, which means that the transmitting UE does not occupy the reserved resource any more periodically, the receiving UE may not exclude the candidate resource and may not collide with the resource.

Based on this, in the above step 403, the first condition that the UE performs resource exclusion according to the SCI further includes: the first indication information in the SCI is used for indicating that the time-frequency resource occupied by the SCI is the last time-frequency resource of the SCI periodically sent in the COT corresponding to the first device.

In one embodiment, the first indication information may be carried in one bit in the first stage SCI or the second stage SCI.

Illustratively, a first indication of 0 may be used to indicate that the resource currently occupied by the SCI is not the last resource within the COT that may be periodically transmitted. The first indication information of 1 may be used to indicate that the resource occupied by the current SCI is the last resource in the COT that may be periodically transmitted.

As shown in fig. 5, the receiving UE receives the SCI at the m time, and the first indication information included in the SCI is 1, so it is known that the receiving UE does not receive any SCI at the m+p1 time and the m+2p1 time may be because the transmitting UE does not have the COT to transmit the SCI reserved resource at the m+p1 time and the m+2p1 time, and thus the receiving UE may exclude the candidate resources overlapping the reserved resource corresponding to the SCI.

In another example, as shown in fig. 6, if the length occupied by the COT of the transmitting UE may reach m0+2×p1, in this case, the first indication information included in the SCI received by the receiving UE at the m0 time and the m0+p time is 0, to indicate that the reserved resource is not the last resource that can be periodically transmitted within the COT, and the first indication information included in the SCI received by the receiving UE at the m time (m=m0+2×p1) is 1, to indicate that the reserved resource is the last resource that can be periodically transmitted within the COT. Therefore, the receiving UE can exclude the candidate resources overlapping with the reserved resource corresponding to the SCI.

Correspondingly, in the example shown in fig. 7, the receiving UE receives the SCI at the m time, and the first indication information included in the SCI is 0, so that it is known that the receiving UE does not receive any SCI at the m+p1 time and the m+2p1 time, not because the transmitting UE has no COT to transmit the SCI reserved resource at the m+p1 time and the m+2p1 time, but because the transmitting UE has no longer occupied the reserved resource. Therefore, the receiving UE may not need to exclude the candidate resources that overlap with the reserved resources corresponding to the SCI.

In a specific embodiment, in combination with step (6) of the foregoing resource exclusion procedure, a candidate resource is removed from the candidate resource set S if the candidate resource simultaneously satisfies the following condition _A Excluding:

1. the UE is at time m (slot) Receiving SCI and decoding P _{rsvp_RX} (when field "Resource reservation period" exists) and prio _RX Wherein P is _{rsvp_RX} And prio _RX Physical period and priority for the PSSCH to which the SCI corresponds.

2. RSRP measurement of PSSCH or PSCCH determined by the SCI is above threshold Th _{prioTX，prioRX} Wherein the threshold Th _{prioTX，prioRX} Th is a function of the priority corresponding to the data indicated in the received SCI and the priority corresponding to the data to be transmitted of the transmitting UE _prioTX Corresponds to the i-th value in "sl-Thres-RSRP-List", where i=priodx+ (priodx-1) ×8, and "sl-Thres-RSRP-List" is specified by the standard.

3. By time slotsThe time-frequency resource determined by the received SCI and when field "Resource reservation period" is present, the receiving UE can expect to be +.>Time-frequency resource and candidate resource determined by SCI of time slot reception>And (5) overlapping. Where q=1, 2, where, Q, j=0, 1, C _resel -1。

Wherein if the first indication information in SCI received at m time is used for indicating that the resource occupied by current SCI is the last resource which can be periodically transmitted in the COT, thenIllustratively, the first indication information may indicate 1. Otherwise, if the first indication information in the SCI received at the m time is used to indicate that the resource occupied by the current SCI is not the last resource that can be periodically transmitted in the COT, the receiving UE does not need to exclude the candidate resource. Illustratively, the first indication information may indicate 0.

In the above embodiment, the specific instruction information in the SCI indicates to the receiving UE whether the reserved resource corresponding to the SCI may not be transmitted because the transmitting UE has no COT, and the receiving UE uses the specific instruction information as one of the judging conditions for resource exclusion, so that resource collision is avoided, and the effective utilization rate of the resource is improved.

In another embodiment, the maximum repetition number is also configured in advance, so that the maximum repetition number of the reserved resource indicated by the SCI is indicated to be periodically occupied by the transmitting UE, and when the receiving UE performs Mode 2 resource selection in the unlicensed frequency band, the resource selection can be performed by determining whether the time-frequency resource in the repetition period corresponding to the maximum repetition number of the reserved resource detected in the listening window coincides with the candidate resource in the resource selection window, so as to avoid resource collision.

Specifically, in step 403 of the foregoing embodiment, the first condition for the UE to perform resource exclusion according to the SCI further includes: the first time-frequency resource is overlapped with the first candidate resource by repeating the time-frequency resource of N periods P1 or overlapped with the time-frequency resource of the first candidate resource by repeating at least one period P2, wherein N is a positive integer, and N is smaller than or equal to a first threshold value. The first threshold value indicates a preset or default maximum repetition number C at the receiving UE side.

In a specific embodiment, in combination with step (6) of the resource exclusion procedure described above, if the candidate resource R _x，y While satisfying the following condition, the candidate resource R is then _x，y From the candidate resource set S _A Excluding:

2. RSRP measurement of PSSCH or PSCCH determined by the SCI is above threshold Th _{prioTX，prioRX} Wherein the threshold Th _{prioTX，prioRX} Is a function of the priority corresponding to the data indicated in the received SCI and the priority corresponding to the data to be transmitted of the transmitting UE.

3. By time slotsThe time-frequency resource determined by the received SCI and when field "Resource reservation period" is present, the receiving UE can expect to be +. >Time-frequency resource and candidate resource determined by SCI of time slot reception>And (5) overlapping. Where q=1, 2, C, i.e. q is a preset maximum number of repetitions, j=0, 1,.. _resel -1。

In one possible implementation manner, the first threshold in the foregoing embodiment may be configured by the second indication information in addition to being configured in advance. Specifically, the receiving UE may receive second indication information, where the second indication information is used to indicate the first threshold. At this time, the first threshold may be used to indicate the remaining number of repetitions of periodically occupying the reserved resources by the transmitting UE.

Alternatively, the transmitting UE may configure the remaining number of repetitions in the second level SCI or MAC CE signaling.

Specifically, the value of the remaining number of repetitions may be marked as C, by C _resel Given, c=c _resel . Wherein C is _resel The value of (C) is specified by the standard, in the case of a configuration comprising "sl_resource_selection_counter _resel =10×sl_resource_resource_counter; otherwise, C _resel ＝1。

In the above embodiment, the first threshold is configured for the receiving UE, that is, the maximum repetition number or the remaining repetition number of the reserved resource that is detected by the detection window is configured, and by determining that the number of repeated occupation of the periodic reserved resource in the detection window is smaller than the first threshold and determining that the periodic reserved resource falls in the resource selection window of the receiving UE within the maximum repetition number, the receiving UE may exclude the reserved resource, so as to avoid resource collision, and solve the problem of subsequent resource collision that may be caused by that the transmitting UE has no COT and may transmit SCI to reserve the resource.

In another embodiment, the SCI in step 402 in the foregoing embodiment further includes third indication information, where the third indication information is used to indicate whether the first apparatus subsequently occupies the first set of time-frequency resources.

That is, the transmitting UE may carry third indication information on whether the reserved resource is subsequently occupied or not in the transmitted SCI. The third indication information, which is exemplary, indicates 0, may indicate that the reserved resource R is no longer used by the subsequently transmitting UE _{x，(y+q×P1)} The method comprises the steps of carrying out a first treatment on the surface of the The third indication information indicates 1, which may indicate that the UE will continue to use the reserved resource R _{x，(y+q×p1)} 。

Based on this, in the above step 403, the first condition that the UE performs resource exclusion according to the SCI further includes: at least one time-frequency resource R preceding time n in the first set of time-frequency resources _{x，(y+q×P1)} All have nothing to go upThere is a receipt of third indication information indicating that the first time-frequency resource is no longer occupied subsequently.

1. receiving UE in slotReceiving SCI and decoding P _{rsvp_RX} And prio _RX And indication information, wherein P _{rsvp_RX} And prio _RX Physical period and priority for the PSSCH to which the SCI corresponds.

2. The third indication information included in the SCI is used to indicate that the UE will continue to use the reserved resource.

3. RSRP measurement of PSSCH or PSCCH determined by the SCI is above threshold Th _{prioTX，prioRX} Wherein the threshold Th _{prioTX，prioRX} Is a function of the priority corresponding to the data indicated in the received SCI and the priority corresponding to the data to be transmitted of the transmitting UE.

4. Receiving UE from time slotThe time-frequency resources determined by the received SCI and when field "Resource reservation period is present, the receiving UE can expect to be +.>Time-frequency resource and candidate resource determined by SCI of time slot reception>And (5) overlapping. Where q=1, 2, …, Q, j=0, 1 …, C _resel -1。

Wherein if n '-m > P' _{rsvp_RX} ，n′-m＞2×P′ _{rsvp_RX} ，......，n′-m＞(i-1)×P′ _{rsvp_RX} And receives the UE at time m+p' _{rsvp_RX} ，m+2×P′ _{rsvp_RX} ，......，m+(i-1)×P′ _{rsvp_RX} No third indication information for indicating that the reserved resource is no longer occupied is received, and n '-m is less than or equal to i multiplied by P' _{rsvp_RX} ThenOtherwise, the receiving UE need not exclude the candidate resource.

In addition, in order to avoid resource collision during the process of accessing the UE to the unlicensed band for resource selection, the embodiment of the present application further provides a method for determining resources of the side uplink, as shown in fig. 8, where the method may include the following steps.

801: the UE determines to occupy a fourth set of time-frequency resources.

Wherein the fourth set of time-frequency resources comprises [ R ] _x，y ，R _x，(y+P1) …R _{x，(y+q×P1)} …]. Wherein the fourth set of time-frequency resources comprises at least one time-frequency resource R _{x，(y+q×P1)} Wherein x represents frequency domain information of the time-frequency resource, y represents time domain information of the time-frequency resource, q×p1 represents an offset value in the time domain, q is a natural number, and P1 represents a time domain period.

That is, the UE determines that starting from the starting time y, P1 is taken as a time interval to occupy the time-frequency resource R periodically _x，y For transmitting data.

802: the UE determines a channel occupation time COT.

The UE accesses the unlicensed frequency band through the LBT mechanism to obtain COT. Illustratively, the COT includes a time period of [ T1, T1+D ], where T1 represents a starting time of the COT and D represents a length of time of the COT.

803: and if the UE determines that the target resource is out of the COT, the UE re-performs resource selection in the COT.

Wherein the target resource is one of the time-frequency resources R of the second time-frequency resource set _{x，(y+N×P1)} N is a positive integer.

That is, the UE determines that the time-frequency resource of the current periodically transmitted data is not in the COT, and therefore, cannot transmit the SCI to inform other UEs, the UE may discard the fourth time-frequency resource set to avoid the subsequent resource collision with other UEs, and may instead re-perform resource selection in the COT.

In one embodiment, in step 803, as shown in fig. 9, the process of the UE re-performing resource selection in the COT may include:

901: the UE determines a fifth set of time-frequency resources within the COT.

The fifth set of time-frequency resources comprises at least one time-frequency resource R _{c，(d+q×P1)} I.e. the fifth set of time-frequency resources comprises R _c，d ，R _c，(d+P1) …R _{c，(d+q×P1)} …]Wherein c represents frequency domain information of the time-frequency resource, d represents time domain information of the time-frequency resource, q×p1 represents an offset value in a time domain, q takes a natural number of 0,1,2, and P1 represents a time domain period.

902: the UE sends SCI indicating to occupy the fifth set of time-frequency resources.

Specifically, the UE sends SCI to other UEs in the multicast group, for indicating that the UE occupies at least one time-frequency resource included in the fifth time-frequency resource set. That is, the UE determines that starting from the starting time d, P1 will be used as a time interval to periodically occupy the time-frequency resource R _c，d For transmitting data.

In another embodiment, in step 803, if the UE determines that the target resource is within the COT, that is, may send the SCI to notify other UEs, the UE continues to occupy the fourth set of time-frequency resources, and does not need to perform resource reselection.

According to the embodiment, whether the time-frequency resource periodically occupied by the current UE is in the COT of the unlicensed frequency band is judged, so that whether the resource reselection in the COT is needed or not is determined according to whether the SCI can be sent, resource conflict is avoided, and the use efficiency of the resource is improved.

Based on the foregoing embodiment shown in fig. 4, the present application further provides a communication device, as shown in fig. 10, where the communication device 1000 includes a processing module 1001 and a transceiver module 1002.

The processing module 1001 is configured to determine a channel occupation time COT.

The transceiver module 1002 is configured to receive side control information SCI from a first device, where the SCI is configured to instruct the first device to occupy a first set of time-frequency resources, and the first set of time-frequency resources includes R _x，y ，R _x，(y+P1) …R _{x，(y+q×P1)} ]Wherein x represents the time-frequency resource R _x，y Y represents the time-frequency resource R _x，y Q×p1 represents an offset value in the time domain, q is a natural number, and P1 represents a time domain period.

The processing module 1001 is further configured to exclude candidate resources satisfying the first condition from a second set of time-frequency resources according to the SCI to obtain a target set of resources, where the second set of time-frequency resources includes a resource selection window [ n+t1, n+t2 ] ]At least one candidate resource within; the second time-frequency resource set is the resource selection window [ T3, T3+D ]]In the time-frequency resource set, T3 represents the starting time of the COT, D represents the time length of the COT, T1 is related to the subcarrier interval, T2 is related to the delay budget of the data packet to be sent, and n is the time when the high-level issuing parameter triggers the resource selection; wherein the candidate resources satisfying the first condition include: the first time-frequency resource set and the third time-frequency resource set have an intersection; wherein the third set of time-frequency resources comprises [ R ] _a，b ，R _a，(b+P2) …R _{a，(b+j×P2)} ]Wherein a represents the time-frequency resource R _a，b B represents the time-frequency resource R _a，b J×p2 represents an offset value in the time domain, j is a natural number, and P2 represents a period of data to be transmitted.

In one possible implementation, the transceiver module 1002 is further configured to receive second indication information, where the second indication information is used to indicate the first threshold value.

In addition, based on the foregoing embodiment shown in fig. 8 or fig. 9, the present application further provides a communication device, as shown in fig. 10, which includes a processing module 1001.

Wherein the processing module 1001 is configured to determine to occupy a fourth set of time-frequency resources, where the fourth set of time-frequency resources includes [ R ] _x，y ，R _x，(y+P1) …R _{x，(y+q×P1)} ]Wherein x represents frequency domain information of the time-frequency resource, y represents time domain information of the time-frequency resource, q×p1 represents an offset value in a time domain, q is a natural number, and P1 represents a time domain period.

The processing module 1001 is further configured to determine a channel occupation time COT; if the target resource is out of the COT, re-selecting the resource in the COT; wherein the target resource is R in the fourth time-frequency resource set _{x，(y+N×p1)} N is a positive integer.

In a possible implementation manner, the processing module 1001 is further configured to determine a fifth set of time-frequency resources within the COT, where the fifth set of time-frequency resources includes [ R _c，d ，R _c，(d+P1) …R _{c，(d+q×P1)} ]Wherein, the method comprises the steps of, wherein,c represents frequency domain information of the time-frequency resource, d represents time domain information of the time-frequency resource, q×p1 represents an offset value in the time domain, q is a natural number, and P1 represents a time domain period.

The communication device further comprises a transceiver module 1002 configured to send sidestream control information SCI, where the SCI is configured to instruct to occupy the fifth set of time-frequency resources.

In a simple embodiment, one skilled in the art will appreciate that the communication device 1000 described above may take the form shown in fig. 3. For example, the processor 301 in fig. 3 may cause the communication device 1000 to perform the method described by the communication device in the method embodiment described above by invoking computer-executable instructions stored in the memory 303.

Illustratively, the functions/implementations of the transceiver module 1002 in fig. 10 may be implemented by the processor 301 in fig. 3 invoking computer-executable instructions stored in the memory 303. Alternatively, the functions/implementation of the processing module 1001 in fig. 10 may be implemented by the processor 301 in fig. 3 calling computer-executable instructions stored in the memory 303, and the functions/implementation of the transceiver module 1002 in fig. 10 may be implemented by the communication interface 304 in fig. 3.

It should be noted that one or more of the above modules or units may be implemented in software, hardware, or a combination of both. When any of the above modules or units are implemented in software, the software exists in the form of computer program instructions and is stored in a memory, a processor can be used to execute the program instructions and implement the above method flows. The processor may be built in a SoC (system on a chip) or ASIC, or may be a separate semiconductor chip. The processor may further include necessary hardware accelerators, such as field programmable gate arrays (rield programmable gate array, FPGAs), PLDs (programmable logic devices), or logic circuits implementing dedicated logic operations, in addition to the cores for executing software instructions for operation or processing.

When the above modules or units are implemented in hardware, the hardware may be any one or any combination of a CPU, microprocessor, digital signal processing (digital signal processing, DSP) chip, micro control unit (microcontroller unit, MCU), artificial intelligence processor, ASIC, soC, FPGA, PLD, special purpose digital circuitry, hardware accelerator, or non-integrated discrete devices that may run the necessary software or that do not rely on software to perform the above method flows.

Optionally, an embodiment of the present application further provides a chip system, including: at least one processor and an interface, the at least one processor being coupled with the memory through the interface, the at least one processor, when executing the computer programs or instructions in the memory, causing the method of any of the method embodiments described above to be performed. In one possible implementation, the system on a chip further includes a memory. Alternatively, the chip system may be formed by a chip, or may include a chip and other discrete devices, which are not specifically limited in this embodiment of the present application.

Optionally, an embodiment of the present application further provides a computer readable storage medium. All or part of the flow in the above method embodiments may be implemented by a computer program to instruct related hardware, where the program may be stored in the above computer readable storage medium, and when the program is executed, the program may include the flow in the above method embodiments. The computer readable storage medium may be an internal storage unit of the communication device of any of the foregoing embodiments, such as a hard disk or a memory of the communication device. The computer readable storage medium may be an external storage device of the communication apparatus, for example, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a flash card (flash card) or the like provided in the communication apparatus. Further, the computer readable storage medium may further include both an internal storage unit and an external storage device of the communication apparatus. The computer-readable storage medium is used to store the computer program described above and other programs and data required by the communication apparatus. The above-described computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.

Optionally, the embodiment of the application further provides a computer program product. All or part of the above-described method embodiments may be implemented by a computer program to instruct related hardware, where the program may be stored in the above-described computer program product, and the program, when executed, may include the above-described method embodiments.

Alternative embodiments of the present application also provide a computer instruction. All or part of the flow in the above method embodiments may be implemented by computer instructions to instruct related hardware (such as a computer, a processor, an access network device, a mobility management network element, or a session management network element, etc.). The program may be stored in the above-mentioned computer readable storage medium or in the above-mentioned computer program product.

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

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

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

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

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

Claims

1. A method of determining resources for a side-link, the method comprising:

determining the channel occupation time COT;

receiving side control information SCI from a first device, the SCI being used to instruct the first device to occupy a first set of time-frequency resources, the first set of time-frequency resources including [ R _x，y ，R _x，(y+P1) ...R _{x，(y+q×P1)} ]Wherein x represents the time-frequency resource R _x，y Y represents the time-frequency resource R _x，y Q×p1 represents an offset value in the time domain, q is a natural number, and P1 represents a time domain period;

according to the SCI, candidate resources meeting the first condition are eliminated from a second time-frequency resource set to obtain a target resource set, wherein the second time-frequency resource set comprises at least one candidate resource in a resource selection window [ n+T1, n+T2 ]; the second time-frequency resource set is a time-frequency resource set of the resource selection window in [ T3, T3+D ], wherein T3 represents the starting time of the COT, D represents the time length of the COT, T1 is related to subcarrier interval, T2 is related to delay budget of a data packet to be sent, and n is the time when the high-level issuing parameter triggers resource selection;

Wherein the first is satisfiedCandidate resources for a condition include: the first time-frequency resource set and the third time-frequency resource set have an intersection; wherein the third set of time-frequency resources comprises [ R ] _a，b ，R _a，(b+P2) ...R _{a，(b+j×P2)} ]Wherein a represents the time-frequency resource R _a，b B represents the time-frequency resource R _a，b J×p2 represents an offset value in the time domain, j is a natural number, and P2 represents a period of data to be transmitted.

2. The method of claim 1 wherein the SCI further includes first indication information, where the first indication information is used to indicate whether a time-frequency resource occupied by the SCI is a last time-frequency resource of a cyclic transmission SCI in a COT corresponding to the first device.

3. The method of claim 2, wherein the candidate resources satisfying the first condition further comprise:

the first indication information in the SCI indicates that the time-frequency resource occupied by the SCI is the last time-frequency resource of the SCI periodically sent in the COT corresponding to the first device.

4. The method of claim 1, wherein the candidate resources satisfying the first condition further comprise:

the q is less than or equal to a first threshold.

5. The method according to claim 4, wherein the method further comprises:

and receiving second indication information, wherein the second indication information is used for indicating the first threshold value.

6. The method of claim 1 wherein the SCI further comprises third indication information, wherein the third indication information is used to indicate whether the first apparatus subsequently occupies the first set of time-frequency resources.

7. The method of claim 6, wherein the candidate resources satisfying the first condition further comprise:

at least one time-frequency resource R preceding said n time instants _{x，(y+q×P1)} And the third indication information for indicating that the first time-frequency resource set is not occupied any more is not received.

8. A method of determining resources for a side-link, the method comprising:

determining to occupy a fourth set of time-frequency resources, the fourth set of time-frequency resources comprising [ R ] _x，y ，R _x，(y+P1) ...R _{x，(y+q×P1)} ]Wherein x represents frequency domain information of the time-frequency resource, y represents time domain information of the time-frequency resource, q×p1 represents an offset value in a time domain, q is a natural number, and P1 represents a time domain period;

determining the channel occupation time COT;

if the target resource is out of the COT, re-selecting the resource in the COT; wherein the target resource is R in the fourth time-frequency resource set _{x，(y+N×P1)} N is a positive integer.

9. The method of claim 8, wherein the resource selection is performed again within the COT, specifically comprising:

determining a fifth set of time-frequency resources within the COT, wherein the fifth set of time-frequency resources comprises [ R ] _c，d ，R _c，(d+P1) ...R _{c，(d+q×P1)} ]Wherein c represents frequency domain information of the time-frequency resource, d represents time domain information of the time-frequency resource, q×p1 represents an offset value in a time domain, q is a natural number, and P1 represents a time domain period;

and transmitting side control information SCI, wherein the SCI is used for indicating to occupy the fifth time-frequency resource set.

10. A communication device is characterized in that the communication device comprises a processing module and a transceiver module,

the processing module is used for determining the channel occupation time COT;

the transceiver module is configured to receive side control information SCI from a first device, where the SCI is configured to instruct the first device to occupy a first set of time-frequency resources, and the first set of time-frequency resources includes R _x，y ，R _x，(y+P1) ...R _{x，(y+q×P1)} ]Wherein x represents the time-frequency resource R _x，y Y represents the time-frequency resource R _x，y Q×p1 represents an offset value in the time domain, q is a natural number, and P1 represents a time domain period;

the processing module is further configured to exclude candidate resources meeting the first condition from a second time-frequency resource set according to the SCI, so as to obtain a target resource set, where the second time-frequency resource set includes at least one candidate resource in a resource selection window [ n+t1, n+t2 ]; the second time-frequency resource set is a time-frequency resource set of the resource selection window in [ T3, T3+D ], wherein T3 represents the starting time of the COT, D represents the time length of the COT, T1 is related to subcarrier interval, T2 is related to delay budget of a data packet to be sent, and n is the time when the high-level issuing parameter triggers resource selection;

Wherein the candidate resources satisfying the first condition include: the first time-frequency resource set and the third time-frequency resource set have an intersection; wherein the third set of time-frequency resources comprises [ R ] _a，b ，R _a，(b+P2) ...R _{a，(b+j×P2)} ]Wherein a represents the time-frequency resource R _a，b B represents the time-frequency resource R _a，b J×p2 represents an offset value in the time domain, j is a natural number, and P2 represents a period of data to be transmitted.

11. The apparatus of claim 10 wherein the SCI further comprises first indication information, where the first indication information is used to indicate whether a time-frequency resource occupied by the SCI is a last time-frequency resource of a cyclic transmission SCI in a COT corresponding to the first apparatus.

12. The apparatus of claim 11, wherein the candidate resources satisfying the first condition further comprise:

13. The apparatus of claim 10, wherein the candidate resources satisfying the first condition further comprise:

the q is less than or equal to a first threshold.

14. The apparatus of claim 13, wherein the transceiver module is further configured to receive second indication information, the second indication information being configured to indicate the first threshold.

15. The apparatus of claim 10 wherein the SCI further comprises third indication information, the third indication information indicating whether the first apparatus subsequently occupies a first set of time-frequency resources.

16. The apparatus of claim 15, wherein the candidate resources satisfying the first condition further comprise:

17. A communication apparatus, the communication apparatus comprising a processing module configured to determine to occupy a fourth set of time-frequency resources, the fourth set of time-frequency resources comprising [ R _x，y ，R _x，(y+P1) ...R _{x，(y+q×P1)} ]Wherein x represents frequency domain information of the time-frequency resource, y represents time domain information of the time-frequency resource, q×p1 represents an offset value in the time domain, q is a natural number, and P1 representsA time domain period;

the processing module is also used for determining the channel occupation time COT;

18. The apparatus of claim 17, wherein the processing module is further configured to,

the communication device further comprises a transceiver module configured to send sidestream control information SCI, where the SCI is configured to instruct to occupy the fifth set of time-frequency resources.

19. A communication device, comprising a processor and a transmission interface;

wherein the processor is configured to execute instructions stored in a memory to cause the apparatus to perform the method of any one of claims 1 to 9.

20. A computer readable storage medium comprising a program or instructions which, when executed by a processor, performs the method of any of claims 1 to 9.

21. A computer program product which, when run on a computer or processor, causes the computer or processor to perform the method of any one of claims 1 to 9.