WO2021155569A1

WO2021155569A1 - Method and apparatus for selecting sidelink resource

Info

Publication number: WO2021155569A1
Application number: PCT/CN2020/074501
Authority: WO
Inventors: 纪鹏宇; 李国荣; 张健; 张磊; 王昕�
Original assignee: 富士通株式会社; 纪鹏宇; 李国荣; 张健; 张磊; 王昕�
Priority date: 2020-02-07
Filing date: 2020-02-07
Publication date: 2021-08-12

Abstract

Provided are a method and apparatus for selecting a sidelink resource. The method comprises: successively selecting at least one sidelink resource from a sidelink resource set according to the number of sending instances corresponding to a data packet to be sent, wherein when the number of selected sidelink resources is greater than one, a currently selected sidelink resource set is determined according to time-frequency resources of one or more selected sidelink resources; sorting the one or more selected sidelink resources according to time; and using the sorted one or more sidelink resources to send a transport block one or more times.

Description

Method and device for selecting side link resources

Technical field

The embodiments of the application relate to the field of communication technology.

Background technique

In Rel-15 and previous versions of the Internet of Vehicles (V2X) communication, two allocation methods of Sidelink resources are supported: Mode 1 and Mode 2. For Mode 1, the side link resources are allocated and obtained by network equipment (for example, base stations); for Mode 2, the terminal device autonomously selects transmission resources, that is, the transmission resources are obtained through a sensing or detection-resource selection process.

On the other hand, New Radio (NR) V2X is currently one of the research projects standardized by Rel-16. Compared with Long Term Evolution (LTE) V2X, NR V2X needs to support many new scenarios and new services ( For example, remote driving, autonomous driving, and fleet driving, etc.), which need to meet higher technical indicators (high reliability, low latency, high data rate, etc.).

It should be noted that the above introduction to the technical background is only for the convenience of a clear and complete description of the technical solutions of the present application, and to facilitate the understanding of those skilled in the art. It should not be considered that the above technical solutions are well-known to those skilled in the art just because these solutions are described in the background art part of this application.

Summary of the invention

The inventor found that compared to LTE V2X, NR V2X needs to support more retransmission times, that is, the number of retransmissions may be greater than one, and the total number of transmissions (initial transmission plus retransmission) may be greater than 2 (for example, the maximum possible The configuration is 32). There is no solution for how to select side link resources for these transmissions in the candidate resource set of the selection window.

In view of at least one of the above-mentioned problems, embodiments of the present application provide a method and device for selecting side link resources.

According to an aspect of the embodiments of the present application, a device for selecting side link resources is provided, including:

The selection unit, which successively selects at least one side link resource from the set of side link resources according to the number of transmissions corresponding to the data packet to be sent; wherein when the number of selected side link resources is more than one, Time-frequency resources of the selected one or more side link resources, and determine the currently selected side link resource set;

A sorting unit, which sorts the selected one or more side link resources according to time; and

The sending unit uses one or more sorted side link resources to send one or more transmission blocks.

According to another aspect of the embodiments of the present application, a method for selecting side link resources is provided, including:

At least one side link resource is selected one by one from the set of side link resources according to the transmission times corresponding to the data packet to be sent; among them, when the number of selected side link resources is more than one, according to the selected one or Time-frequency resources of multiple side link resources to determine the currently selected side link resource set;

Sort the selected one or more side link resources according to time; and

Use the sorted one or more side link resources to send one or more transmission blocks.

According to another aspect of the embodiments of the present application, a communication system is provided, including:

A terminal device, which successively selects at least one side link resource from the set of side link resources according to the number of transmissions corresponding to the data packet to be sent; wherein when the number of selected side link resources is more than one, The time-frequency resources of the selected one or more side link resources, determine the currently selected side link resource set; sort the selected one or more side link resources according to time; and use the sorted one or more Each side link resource transmits one or more transmission blocks.

One of the beneficial effects of the embodiments of the present application is that the terminal device successively selects at least one side link resource from the set of side link resources according to the number of transmissions; among them, when the number of selected side link resources is more than one , Determine the currently selected side link resource set according to the time-frequency resources of the selected one or more side link resources. As a result, not only can support more retransmission times, but also ensure that resources sent multiple times are indicated and reserved by the side link control information.

With reference to the following description and drawings, specific implementations of the present application are disclosed in detail, and the ways in which the principles of the present application can be adopted are indicated. It should be understood that the scope of the embodiments of the present application is not limited thereby. Within the spirit and scope of the terms of the appended claims, the implementation of the present application includes many changes, modifications and equivalents.

Features described and/or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or substituted for features in other embodiments .

It should be emphasized that the term "comprising/comprising" when used herein refers to the existence of a feature, a whole, a step or a component, but does not exclude the existence or addition of one or more other features, a whole, a step or a component.

Description of the drawings

The elements and features described in one drawing or one embodiment of the embodiment of the present application may be combined with the elements and features shown in one or more other drawings or embodiments. In addition, in the drawings, similar reference numerals indicate corresponding parts in several drawings, and may be used to indicate corresponding parts used in more than one embodiment.

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

Figure 2 is a schematic diagram of terminal equipment selecting side link resources;

FIG. 3 is a schematic diagram of a method for selecting side link resources according to an embodiment of the present application;

FIG. 4 is a schematic diagram of selecting side link resources one by one according to an embodiment of the present application;

FIG. 5 is an example diagram of selecting side link resources one by one according to an embodiment of the present application;

FIG. 6 is another example diagram of selecting side link resources one by one according to an embodiment of the present application;

FIG. 7 is another example diagram of selecting side link resources one by one according to an embodiment of the present application;

FIG. 8 is another example diagram of selecting side link resources one by one according to an embodiment of the present application;

FIG. 9 is an example diagram of resource determination in an embodiment of the present application;

FIG. 10 is another schematic diagram of selecting side link resources one by one according to an embodiment of the present application;

FIG. 11 is another example diagram of resource determination in an embodiment of the present application;

FIG. 12 is another schematic diagram of selecting side link resources one by one according to an embodiment of the present application;

FIG. 13 is a schematic diagram of a device for selecting side link resources according to an embodiment of the present application;

FIG. 14 is a schematic diagram of a network device according to an embodiment of the present application;

FIG. 15 is a schematic diagram of a terminal device according to an embodiment of the present application.

Detailed ways

With reference to the drawings, the foregoing and other features of this application will become apparent through the following description. In the specification and drawings, specific implementations of the application are specifically disclosed, which indicate some implementations in which the principles of the application can be adopted. It should be understood that the application is not limited to the described implementations. On the contrary, the present application is not limited to the described implementations. The application includes all modifications, variations and equivalents falling within the scope of the appended claims.

In the embodiments of the present application, the terms "first", "second", etc. are used to distinguish different elements from the terms, but they do not indicate the spatial arrangement or chronological order of these elements. These elements should not be used by these terms. Limited. The term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprising", "including", "having" and the like refer to the existence of the stated features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components.

In the embodiments of this application, the singular forms "a", "the", etc. include plural forms, which should be broadly understood as "a" or "a type" rather than being limited to the meaning of "a"; in addition, the term "so" "Said" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise. In addition, the term "based on" should be understood as "based at least in part on...", and the term "based on" should be understood as "based at least in part on...", unless the context clearly dictates otherwise.

In the embodiments of this application, the term "communication network" or "wireless communication network" can refer to a network that meets any of the following communication standards, such as Long Term Evolution (LTE), and Enhanced Long Term Evolution (LTE-A, LTE-A). Advanced), Wideband Code Division Multiple Access (WCDMA, Wideband Code Division Multiple Access), High-Speed Packet Access (HSPA, High-Speed Packet Access), etc.

Moreover, the communication between devices in the communication system can be carried out according to any stage of communication protocol, for example, it can include but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and 5G , New Radio (NR, New Radio), etc., and/or other currently known or future communication protocols.

In the embodiments of the present application, the term "network device" refers to, for example, a device in a communication system that connects a terminal device to a communication network and provides services for the terminal device. Network equipment may include but not limited to the following equipment: base station (BS, Base Station), access point (AP, Access Point), transmission and reception point (TRP, Transmission Reception Point), broadcast transmitter, mobile management entity (MME, Mobile Management Entity), gateway, server, radio network controller (RNC, Radio Network Controller), base station controller (BSC, Base Station Controller), etc.

Among them, the base station may include but is not limited to: Node B (NodeB or NB), evolved Node B (eNodeB or eNB), 5G base station (gNB), etc., and may also include remote radio head (RRH, Remote Radio Head) , Remote Radio Unit (RRU, Remote Radio Unit), relay (relay), or low-power node (such as femeto, pico, etc.). And the term "base station" can include some or all of their functions, and each base station can provide communication coverage for a specific geographic area. The term "cell" may refer to a base station and/or its coverage area, depending on the context in which the term is used.

In the embodiments of the present application, the term "user equipment" (UE, User Equipment) or "terminal equipment" (TE, Terminal Equipment or Terminal Device), for example, refers to a device that accesses a communication network through a network device and receives network services. The terminal device may be fixed or mobile, and may also be called a mobile station (MS, Mobile Station), terminal, subscriber station (SS, Subscriber Station), access terminal (AT, Access Terminal), station, etc.

Among them, terminal devices may include but are not limited to the following devices: cellular phones (Cellular Phone), personal digital assistants (PDAs, Personal Digital Assistant), wireless modems, wireless communication devices, handheld devices, machine-type communication devices, laptop computers, Cordless phones, smart phones, smart watches, digital cameras, etc.

For another example, in scenarios such as the Internet of Things (IoT), a terminal device may also be a machine or device that performs monitoring or measurement. For example, it may include, but is not limited to: Machine Type Communication (MTC) terminals, In-vehicle communication terminals, device to device (D2D, Device to Device) terminals, machine to machine (M2M, Machine to Machine) terminals, etc.

In addition, the term "network side" or "network device side" refers to a side of the network, which may be a certain base station, and may also include one or more network devices as described above. The term "user side" or "terminal side" or "terminal device side" refers to a side of a user or a terminal, which may be a certain UE, and may also include one or more terminal devices as described above. Unless otherwise specified in this article, "equipment" can refer to network equipment or terminal equipment.

The following uses examples to illustrate the scenarios of the embodiments of the present application, but the present application is not limited to this.

FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present application, schematically illustrating a case where a terminal device and a network device are taken as an example. As shown in FIG. 1, the communication system 100 may include a network device 101 and

terminal devices

102 and 103. For the sake of simplicity, FIG. 1 only takes two terminal devices and one network device as an example for description, but the embodiment of the present application is not limited to this.

In the embodiment of the present application, the network device 101 and the

terminal devices

102 and 103 can perform existing services or future service delivery. For example, these services may include, but are not limited to: enhanced Mobile Broadband (eMBB), large-scale machine type communication (mMTC, massive Machine Type Communication), and high-reliability and low-latency communication (URLLC, Ultra-Reliable and Low). -Latency Communication), etc.

It is worth noting that FIG. 1 shows that two

terminal devices

102 and 103 are both within the coverage of the network device 101, but the application is not limited to this. The two

terminal devices

102 and 103 may not be within the coverage area of the network device 101, or one terminal device 102 is within the coverage area of the network device 101 and the other terminal device 103 is outside the coverage area of the network device 101.

In the embodiment of the present application, side link transmission may be performed between the two

terminal devices

102 and 103. For example, the two

terminal devices

102 and 103 may both perform side link transmission within the coverage area of the network device 101 to implement V2X communication, or both may perform side link transmission outside the coverage area of the network device 101 to implement V2X communication. For communication, it is also possible that one terminal device 102 is within the coverage area of the network device 101 and the other terminal device 103 is outside the coverage area of the network device 101 to perform side link transmission to implement V2X communication.

In the embodiment of the present application, the terminal device 102 and/or 103 can independently select the side link resource (ie Mode 2 is used). In this case, the side link transmission can be independent of the network device 101, that is, the network device 101 is optional. of. Of course, the embodiment of the present application can also combine the autonomous selection of side link resources (ie, Mode 2) and the allocation of side link resources by the network device (ie, Mode 1); this embodiment of the present application does not limit this.

In LTE V2X, terminal equipment can obtain side link transmission resources through the process of sensing detection + resource selection, where sensing can be continuously performed to obtain resource occupancy in the resource pool. For example, the terminal device can estimate the resource occupancy in the next period of time (referred to as the selection window) based on the resource occupancy in the previous period of time (referred to as the perception window).

Fig. 2 is a schematic diagram of a terminal device performing side link resource selection. As shown in Fig. 2, the terminal device uses the (n-1000) to (n-1)th subframe or time slot (ie, sensing window), for example, The side link control information (SCI, Sidelink Control Information) in) can obtain the resource occupancy of the sensing window, and then can estimate the (n+T1) to (n+T2)th subframe or time slot (that is, select The resource occupancy of the selection window.

For example, when there is side link data to be sent, the physical layer of the terminal device obtains the resource selection granularity R _{x, y} from the higher layer (for example, the media access control (MAC, Media Access Control) layer); this granularity can represent a subframe A series of continuous sub-channels within each sub-channel, each sub-channel includes more than one continuous physical resource block (PRB, Physical Resource Block), the number of PRBs can be determined by the resource pool, the resource pool is configured or pre-configured by the network device (such as the base station) _{Configuration; the set of R x,y-} sized resources (hereinafter referred to as R _x,y candidate resources) in all subframes in the entire selection window is initialized and defined as Set A.

The terminal device may exclude part of the candidate resources in Set A according to the result of detection in the perception window before the data to be sent arrives. For example, the following R _x,y candidate resources need to be excluded:

_{——All R x,y} candidate resources in the subframes that may be reserved for resource reservation in the selection window corresponding to the sending subframes of the terminal device in the sensing window;

_{——A certain R x,y} candidate resource in the subframe detected by the terminal device in the sensing window, where it is detected _{on the R x,y} candidate resource that the SCI reserves the corresponding subframe in the current selection window, and The indicated frequency domain resource and this R _{x, y} candidate resource overlap in the frequency domain, and the reference signal received power (RSRP, Reference Signal Receiving) of the Physical Sidelink Shared Channel (PSSCH, Physical Sidelink Shared Channel) corresponding to the SCI Power) detection result is greater than a threshold (hereinafter referred to as RSRP threshold); or, the SCI reserves a subframe after the selection window, and this subframe and the subsequent subframes that may be reserved for the subframe in the current selection window One subframe in the frame is the same subframe in the time domain, and the frequency domain resource and the R _{x, y} candidate resource overlap in the frequency domain, and the RSRP detection result of the PSSCH corresponding to the SCI is greater than the RSRP threshold.

If after the above resource exclusion, the _{number of R x, y} candidate resources remaining in Set A is less than 20% of the initial total, then the RSRP threshold is increased by 3dB, and the initial set A is re-excluded , Until the _{number of remaining R x,y} candidate resources in Set A is greater than or equal to 20% of the initial total.

Put the R _{x, y} candidate resources in Set A into Set B in the descending order of S-RSSI, until _{the number of R x, y} candidate resources in Set B is greater than or equal to R _{x in Set A, y} 20% of the initial total number of candidate resources; among them, Set B is an initially empty set, and S-RSSI represents the linear average of the signal strengths of all sub-channels in _{R x,y candidate resources.}

Then, the physical layer of the terminal device can report Set B to the MAC layer, and the MAC layer makes a random selection in Set B and selects a candidate resource for data transmission. In addition, select a demodulation and coding scheme (MCS, Modulation and Coding Scheme) from the indicated resources for data transmission.

If the MAC layer is configured for retransmission before resource selection, after selecting a resource, the MAC layer sets the remaining available resources and satisfies the time domain range indicated by the initial transmission SCI (for example, [-15,15] subframes) Among the contained resources, one resource is randomly selected, and an MCS is selected among the indicated resources for data retransmission. The first two resources are used to send the initial transmission resource, and the second resource is used to send the retransmission resource.

It is worth noting that the above only schematically illustrates the process of sensing detection + resource selection in LTE V2X. For the specific content of the above process, you can also refer to the content in Section 14.1.1.6 in 3GPP TS 36.213 V15.2.0.

Compared with LTE V2X, NR V2X needs to support more retransmission times, that is, the retransmission times may be greater than 1, and the total transmission times may be greater than 2 (the maximum can be configured to 32). In addition, in the SCI corresponding to each side link resource, only 3 transmission resources can be indicated at most. So far, there is no conclusion on how to select resources for these transmissions in the candidate resource set of the selection window. That is, the mechanism of how the MAC layer in NR V2X performs resource selection in Set B is still unclear. The following embodiments of the present application propose corresponding solutions to one or more of the above-mentioned problems.

In the embodiments of the present application, V2X is taken as an example to describe the side link, but the present application is not limited to this, and may also be applicable to side link transmission scenarios other than V2X. In addition, side link control information (SCI, Sidelink Control Information) is carried by PSCCH, side link data is carried by PSSCH, and side link feedback information is carried by physical side link feedback channel (PSFCH, Physical Sidelink Feedback Channel).

In the following description, without causing confusion, the terms "side link" and "V2X" can be interchanged, the terms "PSFCH" and "side link feedback channel" can be interchanged, and the terms "PSCCH" and " Side link control channel" or "side link control information" can be interchanged, and the terms "PSSCH" and "side link data channel" or "side link data" can also be interchanged.

In addition, transmitting or receiving PSSCH can be understood as sending or receiving side link data carried by the PSSCH; sending or receiving PSFCH can be understood as sending or receiving side link feedback information carried by the PSFCH. At least one transmission (transmission, also called transmission) can be understood as at least one PSSCH/PSCCH transmission or at least one side link data/information transmission, and current transmission can be understood as the current PSSCH/PSCCH transmission or current side link data/information send.

Embodiments of the first aspect

The embodiment of the present application provides a method for selecting side link resources, which is described from the terminal device. The terminal device (which may be referred to as a transmitting terminal device) serves as a sender of service data and sends side link data to one or more other terminal devices (which may be referred to as a receiving terminal device).

Fig. 3 is a schematic diagram of a method for selecting side link resources according to an embodiment of the present application. As shown in Fig. 3, the method includes:

301. Select at least one side link resource from the set of side link resources one by one according to the number of transmissions corresponding to the data packet to be sent; in the case where the number of selected side link resources is more than one, according to the selected Time-frequency resources of one or more side link resources to determine the currently selected side link resource set;

302: Sort the selected one or more side link resources according to time; and

303. Use the sorted one or more side link resources to send one or more transmission blocks.

It is worth noting that Figure 3 above only schematically illustrates the embodiments of the present application, but the present application is not limited thereto. For example, the order of execution among various operations can be appropriately adjusted, and some other operations can be added or some operations can be reduced. Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of FIG. 3 above.

In the embodiment of the present application, one transmission block (TB, Transmission Block) of the data packet to be sent may include one or multiple transmissions, so one or more side link resources need to be selected. The first transmission in time among the one or more transmissions is called the first transmission (referred to as the initial transmission for short), and may also include one or more retransmissions.

In some embodiments, each data packet sent by the physical layer contains a corresponding priority, such as ProSe Per-Packet Priority (PPPP, ProSe Per-Packet Priority); in addition, the degree of channel congestion can be measured by the channel busy rate (CBR). , Channel Busy Ratio) to characterize. According to the PPPP of the data packet to be sent and the CBR of the side link resource pool, the selection range of the number of transmissions can be determined, and the terminal device can select from the selection range to determine the number of transmissions of the transmission block.

In some embodiments, the MAC layer of the terminal device successively selects at least one side link resource from the set of side link resources according to the number of transmissions. This side link resource set S is initially Set B as described above, and how to obtain it can refer to the previous content. In addition, in the embodiment of the present application, the terminal device may randomly select one side link resource each time, but the present application is not limited to this, for example, multiple side link resources may be selected each time.

The following takes one-by-one selection as an example to illustrate the side link resource selection.

Fig. 4 is a schematic diagram of selecting side link resources one by one according to an embodiment of the present application, showing a case where the number of transmissions is at least 2. In the following, n is the number of selection, and 1≤n≤N-1, where N is the transmission The number of times (also called the number of target transmissions). If the number of transmissions is 1, only the following operation 401 may be performed.

As shown in Figure 4, the method includes:

401. Randomly select an edge link resource from a set of edge link resources with a moderate probability.

Taking n=1 as an example, the first time-frequency resource used for transmission can be randomly selected from Set B with a moderate probability, and this is denoted as R ₁ . For convenience, the edge link resource selected for the nth time is denoted as R _n .

402: Exclude the side link resource and the side link resource in the same time slot as the side link resource from the side link resource set to form a first set.

After R _{n is} selected, the candidate resource set needs to exclude R _n itself and all _{resources in the same time slot as R n} , and the resource set after resource exclusion, that is, the first set is denoted as S _n (which is a subset of S). Taking n=1 as an example, the resource set after resource exclusion is set as S ₁ .

403. Use as the first side link resource in the side link resource set whose time interval with at least one side link resource in the first n selected side link resources is within a first predetermined range Two sets.

In some embodiments, the first predetermined range is [-K, K] time slots, and K is an integer greater than or equal to zero. For example, it may be [-31, 31] time slots, that is, taking the side link resource as the comparison object as the starting point, the time range of 31 time slots forward and 31 time slots backward is the first predetermined range. However, this application is not limited to this, and can also be in other ranges, such as [-15,15] time slots or [-63,63] time slots, and so on.

For example, after the nth resource selection is performed and R _n is selected, a total of n resources _{{R 1} , R ₂ ,...R _{n} have been selected.} Then for each resource in all selected resources {R ₁ , R ₂ ,...R _n }, it is considered that the resources within [-K, K] time slots and in Set B meet the conditions For the selected resources {R ₁ , R ₂ ,...R _n }, all the candidate resource sets that meet the conditions, that is, the second set, are denoted as _S'n . This application is not limited to this, and _{one or more resources can be selected from {R 1} , R ₂ ,...R _n }, and the second set can be determined based on these resources.

As shown in Figure 4, the method may further include:

404. Determine whether the intersection of the first set and the second set is empty; if it is empty, execute 407, and if it is not empty, execute 405.

In some embodiments, if after the last resource selection,

It is considered that the resource selection process has ended, and the subsequent resource sorting process is performed _{on the selected N 1} resources {R ₁ , R ₂ ,...R _N1 _{}, where N 1} <N.

405. Randomly select side link resources with equal probability from the intersection of the first set and the second set.

That is, the _n+ _{1th resource R n+1} is randomly selected with equal probability within the set S n ∩S' _n .

406. Determine whether N side link resources have been selected; if N side link resources have been selected, go to 407, if N side link resources have not been selected, go to step 402, and continue to perform side links successively Selection of resources.

In some embodiments, if the resource selection process reaches the number of resources required for the target number of transmissions N, the resource selection process ends, and the selected N ₁ resources {R ₁ , R ₂ ,...R _N1 } are performed In the subsequent resource sorting process, N ₁ =N.

407. Sort the selected side link resources according to time.

408. Configure one or more sorted side link resources for one or more transmissions of the transport block.

In some embodiments, among the sorted side link resources, the resource that is first in time is used for the initial transmission of the transport block, and the i+1th resource in time is used for the i-th retransmission; where 1 ≤i≤N ₁ -1, where N ₁ is the number of side link resources after sorting.

Figure 4 above illustrates some embodiments of side link resource selection, in which each selected resource (except for the first transmitted resource in time) corresponding to the transmission can be indicated by the SCI corresponding to the previous transmission. And set aside.

It is worth noting that Figure 4 above only schematically illustrates the embodiments of the present application, but the present application is not limited thereto. For example, the order of execution among various operations can be appropriately adjusted, and some other operations can be added or some operations can be reduced. Those skilled in the art can make appropriate modifications based on the foregoing content, and are not limited to the description of the foregoing FIG. 4.

Fig. 5 is an example diagram of selecting side link resources one by one according to an embodiment of the present application, showing a situation where the target number of transmissions N=6 and HARQ-ACK is not enabled (disabled). As shown in Fig. ₅ , S={R 5, R ₂ , R _2' , R ₁ , R ₄ , R ₃ , R _3' , R ₆ } in the selection window, and W-1 represents the first predetermined range.

For example, the first randomly selected R _1, at this time _{_{S 1 = {R 5, R}} 2, R 2 ', R 4, R 3, R 3', R 6}, S '1 = {R 2, R _2' , R ₁ , R ₄ , R ₃ , R _3' }, (S ₁ ∩S' ₁ )={R ₂ , R _2' , R ₄ , R ₃ , R _3' }; random selection for the second time the R _2, this case _{_{S 2 = {R 5, R}} 4, R 3, R 3 ', R 6}, S' 2 = {R 5, R 2, R 2 ', R 1, R 4, R 3 , R _3' }, (S ₂ ∩S' ₂ ) = {R ₅ , R ₄ , R ₃ , R _3' _{}; R 3 is} randomly selected for the third time, at this time S ₃ ={R ₅ , R ₄ _{_{, R 6}, S '3}} = {R 5, R 2, R 2', R 1, R 4, R 3, R 3 ', R 6}, (S 3 ∩S' 3) = {R 5, R _4, R _6}; fourth randomly selected R _4, at this time _{_{S 4 = {R 5, R}} 6}, S '4 = {R 5, R 2, R 2', R 1, R 4, _{_{R 3, R 3 ', R}} 6}, (S 4 ∩S' 4) = {R 5, R 6}; the fifth randomly selected R _5, at this time _{_{S 5 = {R 6},}} S '5 ={R ₅ , R ₂ , R _2' , R ₁ , R ₄ , R ₃ , R _3' , R ₆ }, (S ₅ ∩S' ₅ ) = {R ₆ }; R is randomly selected for the sixth time _6. At this time, the target number of transmissions has been reached, and N ₁ =6 resources are selected in total.

Fig. 6 is another example diagram of selecting side link resources one by one according to an embodiment of the present application, showing a situation where the target number of transmissions N=6 and HARQ-ACK is not enabled (disabled). As shown in Fig. 6, S={R ₄ , R ₂ , R _2' , R ₁ , R ₃ , R _3' } in the selection window, and W-1 represents the first predetermined range.

For example, the first randomly selected R _1, at this time _{_{S 1 = {R 4, R}} 2, R 2 ', R 3, R 3'}, S '1 = {R 2, R 2', R 1, R ₃ , R _3' }, (S ₁ ∩S' ₁ ) = {R ₂ , R _2' , R ₃ , R _3' _{}; R 2 is} randomly selected for the second time, at this time S ₂ ={R ₄ _{_{, R 3, R 3 '}}} , S' 2 = {R 4, R 2, R 2 ', R 1, R 3, R 3'}, (S 2 ∩S '2) = {R 4, R 3 , R _{3 '};} the third randomly selected R _3, at this time _{_{S 3 = {R 4},}} S' 3 = {R 4, R 2, R 2 ', R 1, R 3, R 3'} _{_{, (S 3 ∩S '3)}} = {R 4}; fourth randomly selected R _4, at this time _{S 4 = {}, S'} 4 = {R 4, R 2, R 2 ', R 1, R ₃ , R _3' }, (S ₄ ∩S' ₄ )={}; It is considered that the resource selection process has ended, and a total of N ₁ ＝4 resources are selected.

In some embodiments, when resource exclusion is performed in 402, when retransmission based on hybrid automatic repeat request (HARQ) feedback is enabled, in addition to combining the nth side link resource and the Excluding the side link resources of n side link resources in the same time slot, the side link resources in the same physical side link feedback control channel (PSFCH) period as the nth side link resource will be removed from all the side link resources. The edge link resource set is excluded to form the first set.

For example, for side link resources for V2X communication, there is a slot containing PSFCH resources for side link feedback every N time slots (slots), and the N slots corresponding to these PSFCH resources are considered to form one PSFCH period. For specific content such as PSFCH cycle and HARQ feedback, you can refer to related technologies.

Fig. 7 is another example diagram of selecting side link resources one by one according to an embodiment of the present application, showing a situation where the target number of transmissions N=6 and HARQ-ACK is enabled. As shown in Figure 7, S={R ₅ , R ₂ , R _2' , R _P1 , R ₁ , R ₄ , R ₃ , R _3' , R _P2 , R ₆ } in the selection window, W-1 represents the first A predetermined range.

_{For example, if R 1 is} randomly selected for the first time, S ₁ ={R ₅ , R ₂ , R _2' , R ₄ , R ₃ , R _3' , R _P2 , R ₆ }, where R _{P1 is} due to R ₁ within PSFCH period is _{_{excluded, S '1 = {R 2}} , R 2', R P1, R 1, R 4, R 3, R 3 ', R P2}, (S 1 ∩S' 1) = {R ₂ , R _2' , R ₄ , R ₃ , R _3' , R _P2 _{}; R 2 is} randomly selected for the second time, at this time S ₂ ={R ₅ , R ₄ , R ₃ , R _3' , _{_{R P2, R 6}, S}} '2 = {R 5, R 2, R 2', R P1, R 1, R 4, R 3, R 3 ', R P2}, (S 2 ∩S' 2) ={R ₅ , R ₄ , R ₃ , R _3' , R _P2 _{}; R 3 is} randomly selected for the third time, at this time S ₃ ={R ₅ , R ₄ , R ₆ }, where R _{P2 is} due to R the PSFCH cycle ₃ were _{_{excluded, S '3 = {R 5}} , R 2, R 2', R P1, R 1, R 4, R 3, R 3 ', R P2, R 6}, (S 3 _{_{∩S '3) = {R 5}} , R 4, R 6}; fourth randomly selected R _4, at this time _{_{S 4 = {R 5, R}} 6}, S' 4 = {R 5, R 2, R _2' , R _P1 , R ₁ , R ₄ , R ₃ , R _3' , R _P2 , R ₆ }, (S ₄ ∩S' ₄ )={R ₅ , R ₆ }; randomly selected for the fifth time R _5, at this time _{_{S 5 = {R 6},}} S '5 = {R 5, R 2, R 2', R P1, R 1, R 4, R 3, R 3 ', R P2, R 6} _{_{, (S 5 ∩S '5)}} = {R 6}; the sixth randomly selected R _6, at this time has reached the target transmission number, were selected resource N ₁ = 6.

FIG. 8 is another example diagram of selecting side link resources one by one according to an embodiment of the present application, showing a situation where the target number of transmissions N=6 and HARQ-ACK is not enabled (disabled). As shown in Fig. 8, S={R ₄ , R ₂ , R _2' , R _P1 , R ₁ , R ₃ , R _3' , R _P2 } in the selection window, and W-1 represents the first predetermined range.

_{For example, if R 1 is} randomly selected for the first time, S ₁ ={R ₄ , R ₂ , R _2' , R ₃ , R _3' , R _P2 }, where R _{P1 is} due to the PSFCH period of _{R 1} are _{_{excluded, S '1 = {R 2}} , R 2', R P1, R 1, R 3, R 3 ', R P2}, (S 1 ∩S' 1) = {R 2, R 2 ', R _{_{_{3, R 3 ', R P2}}} }; the second randomly selected R _2, this case _{_{S 2 = {R 4, R}} 3, R 3', R P2}, S '2 = {R 4, R 2, R _2' , R _P1 , R ₁ , R ₃ , R _3' , R _P2 }, (S ₂ ∩S' ₂ )={R ₄ , R ₃ , R _3' , R _P2 }; random selection for the third time the R _3, at this time S ₃ = {R _4}, wherein R _P2 R PSFCH result in cycle ₃ is _{_{excluded, S '3 = {R 4}} , R 2, R 2', R P1, R 1, _{_{R 3, R 3 ', R}} P2}, (S 3 ∩S' 3) = {R 4}; fourth randomly selected R _4, at this time _{S 4 = {}, S '} 4 = {R 4, R ₂ , R _2' , R _P1 , R ₁ , R ₃ , R _3' , R _P2 }, (S ₄ ∩S' ₄ )={}; it is considered that the resource selection process has ended, a total of N ₁ ＝4 are selected Resources.

The above explains that all resources in the resource set that are _{in the same PSFCH period as R n} are excluded. This application is not limited to this, and part of the resources in the same PSFCH period as _{R n may also be excluded.}

In some embodiments, when retransmission based on Hybrid Automatic Repeat Request (HARQ) feedback is enabled, and the nth side link resource is in the same physical side link feedback control channel (PSFCH) period, When M side link resources have been selected, the nth side link resource and the side link resource in the same time slot as the nth side link resource are combined with the The remaining side link resources of the nth side link resource in the same physical side link feedback control channel (PSFCH) period are excluded from the side link resource set to form the first set; M is a predetermined positive Integer.

The above schematically illustrates how to select the side link resources one by one. After the resources selected by the method in FIG. 4 are sorted, two adjacent resources are located in the first predetermined range in time. The following is a schematic description of the resource indication and reservation in the SCI.

In some embodiments, when the maximum number of resources N _max that can be indicated in the side link control information is 2, for the i-th side link resource after sorting, the corresponding side link control information indicates The i-th side link resource and the i+1-th side link resource; where 1≤i≤N ₁ -1, N ₁ is the number of the sorted side link resources; for the sorted th the N ₁ side link resources corresponding side link control information indicative of the N ₁ to the first side link resources.

For example, if based on the current configuration, the maximum number of transmissions N _max that can be indicated in the SCI is configured as 2. For a resource that is located in the i-th sorted by time, the corresponding SCI only indicates the resource occupied by itself and the i+1-th resource. The specific time-frequency location and size of each resource; the SCI corresponding to the resource that sent M last time only indicates the location and size of its own resource.

In some embodiments, when the maximum number of resources N _max that can be indicated in the side link control information is 3, for the i-th side link resource after sorting,

If the time interval with the i+2th side link resource is within the second predetermined range, the corresponding side link control information indicates the i-th side link resource and the i+1th side link resource And the i+2th side link resource;

If the time interval with the i+2th side link resource is not within the second predetermined range, the corresponding side link control information indicates the i-th side link resource and the i+1th side link Road resources.

Wherein, 1≤i≤N _₁ -2, N ₁ is the number of sides of the sorted link resources; the N ₁ for the first side of the sorted link resources corresponding side information indicating the link control The N ₁ th side link resource; for the N ₁ -1 th side link resource after sorting, the corresponding side link control information indicates the N ₁ -1 th side link resource and the first side link resource N ₁ side link resources. The second predetermined range is (0, 31) time slots, but the application is not limited to this.

For example, if based on the current configuration, the maximum number of transmissions N _max that can be indicated in the SCI is configured to be 3. For a resource that is located in the i-th sorted by time, if the time interval with the i+2th resource is greater than N Time slot (N can be 31), then its corresponding SCI only indicates the resource occupied by itself and the specific time-frequency position and size of the i+1th resource. Otherwise, the corresponding SCI indicates the specific time-frequency location and size of the resources occupied by itself, the i+1th resource, and the i+2th resource.

In some embodiments, the SCI corresponding to the resource located in the last transmission (the Mth time) only indicates the location and size of its own resources, and the resource located in the M-1 time indicates itself and the location of the resource transmitted in the Mth time. And size.

Fig. 9 is an example diagram of resource determination in an embodiment of the present application. As shown on the left side of Figure 9, the i-th resource and the i+2th resource are within the second predetermined range (represented by W-1), that is, the time interval between them is less than N time slots, then the i-th resource The resource corresponding to the SCI indicates the specific time-frequency location and size of the resource occupied by itself, the i+1th resource, and the i+2th resource.

As shown on the right side of Figure 9, the i-th resource and the i+2th resource are outside the second predetermined range (represented by W-1), that is, the time interval between them is greater than N time slots, then the i-th resource The resource corresponding to the SCI indicates the resource occupied by itself and the specific time-frequency location and size of the i+1th resource.

In the above selection method, two adjacent resources are located in the first predetermined range in time, but this application is not limited to this. The following provides a successive selection method. Two adjacent resources are not necessarily located in the first predetermined range in time. Within a predetermined range.

FIG. 10 is a schematic diagram of selecting side link resources one by one according to an embodiment of the present application, showing a case where the number of transmissions is at least 2; if the number of transmissions is 1, only the following operation 1001 can be performed.

As shown in Figure 10, the method includes:

1001. An edge link resource is randomly selected from the set of edge link resources with a moderate probability.

1002. Exclude the side link resource and the side link resource in the same time slot as the side link resource from the side link resource set to form a first set.

As shown in Figure 10, the method may further include:

1003. Determine whether the first set is empty; if it is empty, execute 1006; if it is not empty, execute 1004.

In some embodiments, if after the last resource selection,

1004. Randomly select side link resources from the first set with medium probability.

I.e., randomly select n + 1, _{n + 1} R & lt resource in the set S _n equiprobable.

1005. Determine whether N side link resources have been selected; if N side link resources have been selected, perform 1006; if N side link resources have not been selected, perform step 1002, and continue to perform side links successively Selection of resources.

1006. Sort the selected side link resources according to time.

1007. Configure one or more sorted side link resources for one or more transmissions of the transport block.

Figure 10 above illustrates some embodiments of side link resource selection, but the present application is not limited thereto. For example, the order of execution among various operations can be appropriately adjusted, and some other operations can be added or some operations can be reduced. Those skilled in the art can make appropriate modifications based on the foregoing content, and are not limited to the description of the foregoing FIG. 10.

In some embodiments, when resource exclusion is performed in 1002, when retransmission based on hybrid automatic repeat request (HARQ) feedback is enabled, the nth side link resource and the n side link resources in the same time slot, and side link resources in the same physical side link feedback control channel (PSFCH) period as the nth side link resource from the The edge link resource set is excluded to form the first set.

In some embodiments, when resource exclusion is performed in 1002, when retransmission based on hybrid automatic repeat request (HARQ) feedback is enabled, and the nth side link resource is fed back on the same physical side link When M side link resources in the control channel (PSFCH) period have been selected, the nth side link resource and the side link resource in the same time slot as the nth side link resource Link resources, and the remaining side link resources in the same physical side link feedback control channel (PSFCH) period as the nth side link resource are excluded from the side link resource set to form the first A set; M is a predetermined positive integer.

The above illustrates schematically how to select side link resources one by one. After the resources selected by the method in FIG. 4 are sorted, two adjacent resources may not necessarily be within the first predetermined range in time. The following is a schematic description of the resource indication and reservation in the SCI.

In some embodiments, when the maximum number of resources N _max that can be indicated in the side link control information is 2, for the i-th side link resource after sorting,

If the time interval with the i+1 th side link resource is within the second predetermined range, the corresponding side link control information indicates the i th side link resource and the i+1 th side link resource ；

If the time interval with the i+1 th side link resource is not within the second predetermined range, the corresponding side link control information indicates the i th side link resource;

Wherein, 1≤i≤N _₁ -1, N ₁ is the number of link resources side of the sorted; the N ₁ to the first side of the sorted link resources corresponding side information indicating the link control The N ₁ side link resource. The second predetermined range is (0, 31) time slots, but the application is not limited to this.

For example, if based on the current configuration, the maximum number of transmissions Nmax that can be indicated in the SCI is configured as 2. For a resource that is located in the i-th sorted by time, if the time interval with the i+1-th resource is greater than N Slot (N can be 31), then its corresponding SCI only indicates the time-frequency position and size of the resource occupied; otherwise, its corresponding SCI indicates the specific time-frequency of the resource occupied by itself and the i+1th resource Location and size; the SCI corresponding to the resource that sent M last time only indicates the location and size of its own resource.

If the time interval with the i+1th side link resource is within the second predetermined range, but the time interval with the i+2th side link resource is not within the second predetermined range, then the corresponding edge The link control information indicates the i-th side link resource and the (i+1)th side link resource;

If the time interval from the i+2th side link resource is within the second predetermined range, the corresponding side link control information indicates the i-th side link resource and the i+1th side link resource Side link resources and the i+2th side link resource;

Wherein, 1≤i≤N _₁ -2, N ₁ is the number of sides of the sorted link resources; the N ₁ for the first side of the sorted link resources corresponding side information indicating the link control The N ₁ th side link resource; for the N ₁ -1 th side link resource _{after sorting, if the time interval with the N 1} th side link resource is within the second predetermined range, the corresponding The side link control information indicates the N ₁ -1 th side link resource and the N ₁ th side link resource, if _{the time interval with the N 1} th side link resource is not in the second predetermined _{Within the range, the N 1} -1th side link resource is indicated in the corresponding side link control information. The second predetermined range is (0, 31) time slots, but the application is not limited to this.

For example, if based on the current configuration, the maximum number of transmissions Nmax that can be indicated in the SCI is configured to be 3. For a resource that is located in the i-th sorted by time, if the time interval with the i+1-th resource is greater than N times Slot (N can be 31), the corresponding SCI only indicates the time-frequency position and size of the resource occupied by itself; otherwise, if the time interval with the i+1th resource is less than or equal to N time slots, But the time interval with the i+2th resource is greater than N time slots, the corresponding SCI only indicates the resource occupied by itself and the specific time-frequency position and size of the i+1th resource; otherwise, its corresponding The SCI indicates the specific time-frequency location and size of the resources occupied by itself, the i+1th resource, and the i+2th resource. The SCI corresponding to the resource located in the last transmission (Mth time) only indicates the location and size of its own resources. The resource located in the M-1 transmission indicates itself or indicates the location and the location of the resource transmitted in the M-1 time. size.

FIG. 11 is another example diagram of resource determination in an embodiment of the present application. As shown in the upper part of Figure 11, the i-th resource and the i+2th resource are within the second predetermined range (represented by W-1), that is, the time interval between them is less than N time slots, then the i-th resource The resource corresponding to the SCI indicates the specific time-frequency location and size of the resource occupied by itself, the i+1th resource, and the i+2th resource.

As shown in the middle of Figure 11, the i-th resource and the i+1-th resource are within the second predetermined range (represented by W-1), that is, the time interval between them is less than N time slots; the i-th resource And the i+2th resource is outside the second predetermined range (indicated by W-1), that is, the time interval between them is greater than N time slots, then the i-th resource corresponds to the resource occupied by the SCI and the first The specific time-frequency location and size of i+1 resources.

As shown in the lower part of Figure 11, the i-th resource, the i+1th resource, and the i+2th resource are all outside the second predetermined range (represented by W-1), that is, the time interval between them is greater than N Timeslots, the i-th resource corresponds to the specific time-frequency location and size of the resource occupied by the SCI indicating the specific time-frequency position and size.

The above describes the sequential selection of side link resources. It is also possible to directly select all resources from the candidate resources S at random. If two or more resources are in the same time slot in time (or when HARQ feedback uses The same PSFCH cycle when it is enabled), a resource in this time slot (or the same PSFCH cycle when HARQ feedback is enabled) is randomly reserved, and the remaining resources that collide in this time slot are reset in the remaining candidate resource set. Select until each resource is located in a different time slot (or a different PSFCH period when HARQ feedback is enabled). The resource selection end condition is still that the maximum number of times is reached, or there is no optional resource that is not in the same time slot as the selected resource (or the same PSFCH period when HARQ feedback is enabled). That is, the actual number of transmissions is less than or equal to N.

The following provides another successive selection method, which can be considered as combining Fig. 4 and Fig. 10; two adjacent resources may not necessarily be within the first predetermined range in time.

FIG. 12 is another schematic diagram of selecting side link resources one by one according to an embodiment of the present application, showing a case where the number of transmissions is at least 2; if the number of transmissions is 1, only the following operation 1201 can be performed.

As shown in Figure 12, the method includes:

1201. Randomly select an edge link resource from the set of edge link resources with medium probability.

1202. Exclude the side link resource and the side link resource in the same time slot as the side link resource from the side link resource set to form a first set.

1203. Use a side link resource in the side link resource set with a time interval from at least one side link resource in the first predetermined range from the selected first n side link resources as the first Two sets.

In some embodiments, the first predetermined range is [-K, K] time slots. For example, it may be [-31, 31] time slots, that is, taking the side link resource as the comparison object as the starting point, the time range of 31 time slots forward and 31 time slots backward is the first predetermined range. However, this application is not limited to this, and can also be in other ranges, such as [-15,15] time slots or [-63,63] time slots, and so on.

For example, after the nth resource selection is performed and R _n is selected, a total of n resources _{{R 1} , R ₂ ,...R _{n} have been selected.} Then for each resource in all selected resources {R ₁ , R ₂ ,...R _n }, the resources within [-K, K] time slots and in Set B are regarded as satisfying conditions H. This application is not limited to this, and _{one or more resources can be selected from {R 1} , R ₂ ,...R _n }, and the second set can be determined based on these resources. For the selected resources {R ₁ , R ₂ ,...R _n }, all the candidate resource sets that meet the conditions, that is, the second set, are denoted as _S'n .

As shown in Figure 12, the method may further include:

1204. Determine whether the intersection of the first set and the second set is empty; if it is empty, execute 1207, and if it is not empty, execute 1205.

1205. Randomly select side link resources with equal probability from the intersection of the first set and the second set.

1206. Determine whether N side link resources have been selected; if N side link resources have been selected, then execute 1207; if N side link resources have not been selected yet, execute step 1202, and continue to perform side links successively Selection of resources.

1207: Sort the selected side link resources according to time.

1208. Configure one or more sorted side link resources for one or more transmissions of the transport block.

For example, when the maximum number of resources N _max that can be indicated in the side link control information is 2, for the i-th (1≤i≤N ₁ -1) side link resource after sorting, the corresponding side link Indicating the i-th side link resource and the (i+1)th side link resource in the path control information;

For the N ₁ side of the sorted link resources corresponding side link control information indicative of the N ₁ to the first side link resources.

_{For example, in the case where the maximum number of resources N max} that can be indicated in the side link control information is 3, for the i-th (1≤i≤N ₁ -2) sorted side link resource, if the The time interval of +2 side link resources is within the second predetermined range, the corresponding side link control information indicates the i-th side link resource, the i+1-th side link resource, and the i+2 side link resources; if the time interval with the i+2th side link resource is not within the second predetermined range, the corresponding side link control information indicates the i-th side link Resources and the i+1th side link resource;

For the N ₁ side of the sorted link resources corresponding side link control information indicative of said first side link resources the N _1; N ₁ -1 for the first sides sorted link resources corresponding The side link control information indicates the N ₁ -1 th side link resource and the N ₁ th side link resource.

As shown in Figure 12, the method may further include:

1209: Determine whether the first set is empty; if it is empty, execute 1213, and if it is not empty, execute 1210.

In some embodiments, if after the last resource selection,

1210. Randomly select side link resources from the first set with medium probability.

1211. Determine whether N side link resources have been selected; if N side link resources have been selected, go to 1213, if N side link resources have not been selected, go to step 1212, and continue to perform side links successively Selection of resources.

1212. Exclude the side link resource and the side link resource in the same time slot as the side link resource from the side link resource set to form the first set;

1213: Sort the selected side link resources according to time.

1214. Configure one or more sorted side link resources for one or more transmissions of the transport block.

_{For example, in the case where the maximum number of resources N max} that can be indicated in the side link control information is 2, for the i-th (1≤i≤N ₁ -1) side link resource after sorting, if the The time interval of the +1 side link resource is within the second predetermined range, the corresponding side link control information indicates the i-th side link resource and the (i+1)th side link resource; The time interval of i+1 side link resources is not within the second predetermined range, then the corresponding side link control information indicates the i-th side link resource;

_{For example, in the case where the maximum number of resources N max} that can be indicated in the side link control information is 3, for the i-th (1≤i≤N ₁ -2) sorted side link resource, if the The time interval of the +1 side link resource is not within the second predetermined range, the corresponding side link control information indicates the i-th side link resource; if it is related to the time of the i+1-th side link resource If the interval is within the second predetermined range, but the time interval with the i+2th side link resource is not within the second predetermined range, the corresponding side link control information indicates the i-th side link Channel resources and the i+1th side link resource; if the time interval with the i+2th side link resource is within the second predetermined range, the corresponding side link control information indicates the ith side link resource Two side link resources, the i+1th side link resource, and the i+2th side link resource;

For the N ₁ side of the sorted link resources corresponding side link control information indicative of said first side link resources the N _1; N ₁ -1 first sides for the sorted link resources, and if the first time the N ₁ side link resources interval within the second predetermined range, indicating the N-th downlink control information corresponding to edges in the sides _1-1 and link resources of the first side of the N ₁ If the time interval between the link resource and the N ₁ th side link resource is not within the second predetermined range, the corresponding side link control information indicates the N ₁ -1 th side link resource.

Figure 12 above illustrates some embodiments of side link resource selection, but the present application is not limited thereto. For example, the order of execution among various operations can be appropriately adjusted, and some other operations can be added or some operations can be reduced. Those skilled in the art can make appropriate modifications based on the foregoing content, and are not limited to the description of the foregoing FIG. 12.

The above embodiments only exemplify the embodiments of the present application, but the present application is not limited thereto, and appropriate modifications may also be made on the basis of the above various embodiments. For example, each of the above embodiments may be used alone, or one or more of the above embodiments may be combined.

It can be seen from the foregoing embodiment that the terminal device selects at least one side link resource from the set of side link resources according to the number of transmissions; among them, when the number of selected side link resources is more than one, the terminal device selects at least one side link resource according to the selected The time-frequency resources of one or more side link resources determine the currently selected side link resource set. As a result, not only can support more retransmission times, but also ensure that resources sent multiple times are indicated and reserved by the side link control information.

Embodiment of the second aspect

An embodiment of the present application provides a device for selecting side link resources. The device may be, for example, a terminal device (for example, the aforementioned terminal device), or may be some or some components or components configured in the terminal device, and the same content as the embodiment of the first aspect will not be repeated.

FIG. 13 is a schematic diagram of an apparatus for selecting side link resources according to an embodiment of the present application. As shown in FIG. 13, the device 1300 for selecting side link resources includes:

The selecting unit 1301, which successively selects at least one side link resource from the set of side link resources according to the number of transmissions corresponding to the data packet to be sent; wherein when the number of the selected side link resource is more than one, according to Time-frequency resources of the selected one or more side link resources, and determine the currently selected side link resource set;

A sorting unit 1302, which sorts the selected one or more side link resources according to time; and

The sending unit 1303 uses the sorted one or more side link resources to send one or more transmission blocks.

In some embodiments, the selecting unit 1301 is configured to: randomly select the n-th side link resource from the set of side link resources with medium probability; where 1≤n≤N-1, where N is the number of transmissions; The nth side link resource and the side link resource in the same time slot as the nth side link resource are excluded from the set of side link resources to form a first set; The time interval between at least one edge link resource among the first n edge link resources is within a first predetermined range, and the edge link resource in the edge link resource set is used as the second set; and The n+1th side link resource is randomly selected at the intersection of the set and the second set with equal probability.

In some embodiments, the selection unit 1301 is further configured to: if retransmission based on hybrid automatic repeat request feedback is enabled, combine the nth side link resource with the nth side link resource. The side link resources with path resources in the same time slot and the side link resources in the same physical side link feedback control channel period as the nth side link resource are excluded from the set of side link resources To form the first set.

In some embodiments, the selection unit 1301 is further configured to: when retransmission based on the hybrid automatic repeat request feedback is enabled, and the nth side link resource is in the same physical side link feedback control channel period When M side link resources have been selected, the nth side link resource and the side link resource in the same time slot as the nth side link resource are combined with all The remaining side link resources of the nth side link resource in the same physical side link feedback control channel period are excluded from the side link resource set to form the first set; M is a predetermined positive integer.

In some embodiments, the sorting unit 1302 is further configured to: when N edge link resources have been selected, sort the selected edge link resources according to time.

In some embodiments, the sorting unit 1302 is further configured to: when the intersection of the first set and the second set is empty, sort the selected side link resources according to time.

In some embodiments, the sending unit 1303 uses the resource that is the first in time among the sorted side link resources for the initial transmission of the transport block, and uses the i+1th resource in time for the i-th time. Retransmission; where 1≤i≤N ₁ -1, and N ₁ is the number of side link resources after the sorting.

If the time interval with the i+2th side link resource is not within the second predetermined range, the corresponding side link control information indicates the i-th side link resource and the i+1th side link Road resources

Where 1≤i≤N _₁ -2, N ₁ is the number of the sorted link resources of said side; the N ₁ to the first side of the sorted link resources corresponding side information indicates that the link control The N ₁ th side link resource; for the N ₁ -1 th side link resource after sorting, the corresponding side link control information indicates the N ₁ -1 th side link resource and the N th side link resource ₁ side link resource.

In some embodiments, the selection unit 1301 is further configured to: after the nth resource is selected, if the intersection of the first set and the second set is empty, select the first set with a moderate probability Randomly select the n+1th side link resource; the n+1th side link resource and the side link resource in the same time slot as the n+1th side link resource from all The first set is excluded from the set of side link resources; the n+2th side link resource is randomly selected from the first set with medium probability.

In some embodiments, the sorting unit 1302 is further configured to: when N edge link resources have been selected, sort the selected edge link resources according to time; or, if the first set is empty In the case of, sort the selected side link resources according to time.

In some embodiments, the selecting unit 1301 is configured to: randomly select the n-th side link resource from the set of side link resources with medium probability; where 1≤n≤N-1, where N is the number of transmissions; The nth side link resource and the side link resource in the same time slot as the nth side link resource are excluded from the set of side link resources to form a first set; The n+1th side link resource is randomly selected by the set with medium probability.

Where 1≤i≤N _₁ -1, N ₁ is the number of the sorted link resources of said side; the N ₁ to the first side of the sorted link resources corresponding side information indicates that the link control N ₁ side link resource.

Where 1≤i≤N _₁ -2, N ₁ is the number of the sorted link resources of said side; the N ₁ to the first side of the sorted link resources corresponding side information indicates that the link control the first side link resources the N _1; N-sorted for _1-1 sides link resources, the first time if the N ₁ side link resources interval within the second predetermined range, then the corresponding edge The link control information indicates the N ₁ -1 th side link resource and the N ₁ th side link resource, if _{the time interval with the N 1} th side link resource is not within the second predetermined range , The corresponding side link control information indicates the N ₁ -1th side link resource.

It is worth noting that the above only describes the components or modules related to the application, but the application is not limited thereto. The device 1300 for selecting side link resources may also include other components or modules. For the specific content of these components or modules, reference may be made to related technologies.

In addition, for the sake of simplicity, FIG. 13 only exemplarily shows the connection relationship or signal direction between various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection can be used. The foregoing components or modules may be implemented by hardware facilities such as a processor, a memory, a transmitter, and a receiver; the implementation of this application does not limit this.

Embodiments of the third aspect

An embodiment of the present application also provides a communication system, which may refer to FIG.

In some embodiments, the communication system 100 may at least include:

The embodiments of the present application also provide a network device, which may be a base station, for example, but the present application is not limited to this, and may also be other network devices.

FIG. 14 is a schematic diagram of the structure of a network device according to an embodiment of the present application. As shown in FIG. 14, the network device 1400 may include: a processor 1410 (for example, a central processing unit CPU) and a memory 1420; the memory 1420 is coupled to the processor 1410. The memory 1420 can store various data; in addition, it also stores an information processing program 1430, and the program 1430 is executed under the control of the processor 1410.

In addition, as shown in FIG. 14, the network device 1400 may further include: a transceiver 1440, an antenna 1450, etc.; wherein the functions of the above-mentioned components are similar to those of the prior art, and will not be repeated here. It is worth noting that the network device 1400 does not necessarily include all the components shown in FIG. 14; in addition, the network device 1400 may also include components not shown in FIG. 14, and the prior art can be referred to.

The embodiments of the present application also provide a terminal device, but the present application is not limited to this, and may also be other devices.

FIG. 15 is a schematic diagram of a terminal device according to an embodiment of the present application. As shown in FIG. 15, the terminal device 1500 may include a processor 1510 and a memory 1520; the memory 1520 stores data and programs, and is coupled to the processor 1510. It is worth noting that this figure is exemplary; other types of structures can also be used to supplement or replace this structure to achieve telecommunication functions or other functions.

For example, the processor 1510 may be configured to execute a program to implement the method for selecting side link resources as described in the embodiment of the first aspect. For example, the processor 1510 may be configured to perform the following control: select at least one side link resource from the set of side link resources according to the number of transmissions corresponding to the data packet to be sent; In the case of more than one, determine the currently selected side link resource set according to the time-frequency resources of the selected one or more side link resources; sort the selected one or more side link resources according to time ; And use the sorted one or more side link resources to send one or more transmission blocks.

As shown in FIG. 15, the terminal device 1500 may further include: a communication module 1530, an input unit 1540, a display 1550, and a power supply 1560. Among them, the functions of the above-mentioned components are similar to those of the prior art, and will not be repeated here. It is worth noting that the terminal device 1500 does not necessarily include all the components shown in FIG. 15 and the above-mentioned components are not necessary; in addition, the terminal device 1500 may also include components not shown in FIG. There is technology.

An embodiment of the present application also provides a computer program, wherein when the program is executed in a terminal device, the program causes the terminal device to execute the method for selecting side link resources described in the embodiment of the first aspect.

An embodiment of the present application also provides a storage medium storing a computer program, wherein the computer program enables a terminal device to execute the method for selecting side link resources described in the embodiment of the first aspect.

The above devices and methods of this application can be implemented by hardware, or can be implemented by hardware combined with software. This application relates to such a computer-readable program, when the program is executed by a logic component, the logic component can realize the above-mentioned device or constituent component, or the logic component can realize the above-mentioned various methods Or steps. This application also relates to storage media used to store the above programs, such as hard disks, magnetic disks, optical disks, DVDs, flash memory, etc.

The method/device described in conjunction with the embodiments of the present application may be directly embodied as hardware, a software module executed by a processor, or a combination of the two. For example, one or more of the functional block diagrams and/or one or more combinations of the functional block diagrams shown in the figure may correspond to each software module of the computer program flow or each hardware module. These software modules can respectively correspond to the steps shown in the figure. These hardware modules can be implemented by solidifying these software modules by using a field programmable gate array (FPGA), for example.

The software module can be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM or any other form of storage medium known in the art. A storage medium may be coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be a component of the processor. The processor and the storage medium may be located in the ASIC. The software module can be stored in the memory of the mobile terminal, or can be stored in a memory card that can be inserted into the mobile terminal. For example, if the device (such as a mobile terminal) uses a larger-capacity MEGA-SIM card or a large-capacity flash memory device, the software module can be stored in the MEGA-SIM card or a large-capacity flash memory device.

One or more of the functional blocks and/or one or more combinations of the functional blocks described in the drawings can be implemented as general-purpose processors, digital signal processors (DSPs) for performing the functions described in this application. ), application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any appropriate combination thereof. One or more of the functional blocks described in the drawings and/or one or more combinations of the functional blocks can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, and multiple micro-processing Processor, one or more microprocessors in communication with the DSP, or any other such configuration.

The application is described above in conjunction with specific implementations, but it should be clear to those skilled in the art that these descriptions are all exemplary and do not limit the scope of protection of the application. Those skilled in the art can make various variations and modifications to the application according to the spirit and principle of the application, and these variations and modifications are also within the scope of the application.

Regarding the implementation including the above examples, the following supplementary notes are also disclosed:

Supplement 1. A method for selecting side link resources includes:

Sort the selected one or more side link resources according to time; and

Supplement 2. The method according to Supplement 1, wherein the step of selecting at least one side link resource from the set of side link resources according to the number of transmissions includes:

Randomly select the n-th side link resource from the set of side link resources with medium probability; where 1≤n≤N-1, and N is the number of transmissions;

Excluding the nth side link resource and the side link resource in the same time slot as the nth side link resource from the side link resource set to form a first set;

Use the side link resource in the set of side link resources with a time interval with at least one side link resource in the first predetermined range from the selected first n side link resources as the second set ；

The n+1th side link resource is randomly selected with equal probability from the intersection of the first set and the second set.

Appendix 3. The method according to Appendix 2, wherein the first predetermined range is [-31,31] time slots.

Supplement 4. The method according to Supplement 2 or 3, wherein the method further includes:

When retransmission based on hybrid automatic repeat request (HARQ) feedback is enabled, the nth side link resource and the side link in the same time slot as the nth side link resource Path resources, and side link resources in the same physical side link feedback control channel (PSFCH) period as the nth side link resource are excluded from the side link resource set to form the first set .

Supplement 5. The method according to Supplement 2 or 3, wherein the method further comprises:

When retransmission based on hybrid automatic repeat request (HARQ) feedback is enabled, and the side link resource in the same physical side link feedback control channel (PSFCH) period as the nth side link resource has been When M is selected, the nth side link resource and the side link resource in the same time slot as the nth side link resource are combined with the nth side link resource. The remaining side link resources of the resources in the same physical side link feedback control channel (PSFCH) period are excluded from the side link resource set to form the first set; M is a predetermined positive integer.

Supplement 6. The method according to any one of Supplements 2 to 5, wherein the method further comprises:

In the case where N side link resources have been selected, the selected side link resources are sorted according to time.

Supplement 7. The method according to any one of Supplements 2 to 5, wherein the method further includes:

In the case where the intersection of the first set and the second set is empty, sort the selected side link resources according to time.

Appendix 8. The method according to appendix 6 or 7, wherein the resource that is the frontmost in time among the sorted side link resources is used for the initial transmission of the transmission block, and the i+1th in time The resource is used for the i-th retransmission;

Where 1≤i≤N ₁ -1, N ₁ is the number of side link resources after the sorting.

Supplement 9. The method according to any one of Supplements 1 to 7, wherein, when the maximum number of resources N _max that can be indicated in the side link control information is 2, for the i-th side after sorting Link resource, the corresponding side link control information indicates the i-th side link resource and the (i+1)th side link resource;

Supplement 10. The method according to any one of Supplements 1 to 7, wherein, when the maximum number of resources N _max that can be indicated in the side link control information is 3, for the i-th side after sorting Link resources,

Appendix 11. The method according to Appendix 10, wherein the second predetermined range is (0, 31) time slots.

Supplement 12. The method according to any one of Supplements 2 to 5, wherein the method further includes:

After selecting the nth resource, in the case where the intersection of the first set and the second set is empty, randomly select the n+1th side link from the first set with medium probability resource.

Appendix 13. The method according to Appendix 12, wherein the method further includes:

The n+1th side link resource and the side link resource in the same time slot as the n+1th side link resource are excluded from the side link resource set to form the first A collection

The n+2th side link resource is randomly selected from the first set with medium probability.

Supplement 14. The method according to Supplement 13, wherein the method further includes:

Supplement 15. The method according to Supplement 13, wherein the method further includes:

In the case that the first set is empty, the selected side link resources are sorted according to time.

Supplement 16. The method according to Supplement 14 or 15, wherein the resource that is the first in time among the sorted side link resources is used for the initial transmission of the transmission block, and the i+1th in time The resource is used for the i-th retransmission;

Supplement 17. The method according to Supplement 1, wherein the step of selecting at least one side link resource from the set of side link resources according to the number of transmissions includes:

The n+1th side link resource is randomly selected from the first set with medium probability.

Supplement 18. The method according to Supplement 17, wherein the method further includes:

Supplement 19. The method according to Supplement 17, wherein the method further includes:

Supplement 20. The method according to any one of Supplements 17 to 19, wherein the method further comprises:

Supplement 21. The method according to any one of Supplements 17 to 19, wherein the method further includes:

Supplement 22. The method according to Supplement 20 or 21, wherein the resource that is the first in time among the sorted side link resources is used for the initial transmission of the transmission block, and the i+1th in time The resource is used for the i-th retransmission;

Supplement 23. The method according to any one of Supplements 17 to 21, wherein, when the maximum number of resources N _max that can be indicated in the side link control information is 2, for the i-th side after sorting Link resources,

Supplement 24. The method according to any one of Supplements 17 to 21, wherein, when the maximum number of resources N _max that can be indicated in the side link control information is 3, for the i-th side after sorting Link resources,

Supplement 25. The method according to Supplement 23 or 24, wherein the second predetermined range is (0, 31) time slots.

Attachment 26. A method for determining resources, including:

_{When the maximum number of resources N max} that can be indicated in the side link control information is 2, for the i-th side link resource after sorting, the i-th side link is indicated in the corresponding side link control information Path resources and the i+1th side link resource;

Attachment 27. A method for determining resources, including:

_{When the maximum number of resources N max} that can be indicated in the side link control information is 3, for the i-th side link resource after sorting,

Attachment 28. A method for determining resources, including:

_{In the case where the maximum number of resources N max} that can be indicated in the side link control information is 2, for the i-th side link resource after sorting,

Attachment 29. A method for determining resources, including:

Appendix 30. A terminal device comprising a memory and a processor, the memory storing a computer program, and the processor is configured to execute the computer program to implement the edge described in any one of appendix 1 to 25 Link resource selection method, or resource determination method as described in any one of appendix 26 to 29.

Claims

A device for selecting side link resources includes:

The selection unit, which successively selects at least one side link resource from the set of side link resources according to the number of transmissions corresponding to the data packet to be sent; wherein when the number of selected side link resources is more than one, Time-frequency resources of the selected one or more side link resources, and determine the currently selected side link resource set;

A sorting unit, which sorts the selected one or more side link resources according to time; and

The sending unit uses one or more sorted side link resources to send one or more transmission blocks.
The device according to claim 1, wherein the selection unit is configured to:

Randomly select the n-th side link resource from the set of side link resources with medium probability; where 1≤n≤N-1, and N is the number of transmissions;

Excluding the nth side link resource and the side link resource in the same time slot as the nth side link resource from the side link resource set to form a first set;

Use the side link resource in the set of side link resources with a time interval with at least one side link resource in the first predetermined range from the selected first n side link resources as the second set ;as well as

The n+1th side link resource is randomly selected with equal probability from the intersection of the first set and the second set.
The device according to claim 2, wherein the selection unit is further configured to:

When the retransmission based on the hybrid automatic repeat request feedback is enabled, the nth side link resource and the side link resource in the same time slot as the nth side link resource are combined, And the edge link resource in the same physical edge link feedback control channel period as the nth edge link resource is excluded from the edge link resource set to form the first set.
The device according to claim 2, wherein the selection unit is further configured to:

When retransmission based on hybrid automatic repeat request feedback is enabled, and M side link resources in the same physical side link feedback control channel period as the nth side link resource have been selected Next, the nth side link resource and the side link resource in the same time slot as the nth side link resource, and the nth side link resource in the same physical side chain The remaining side link resources in the channel feedback control channel period are excluded from the side link resource set to form the first set; M is a predetermined positive integer.
The device according to claim 2, wherein the sorting unit is further used for:

In the case where N side link resources have been selected, sort the selected side link resources according to time; or,

In the case where the intersection of the first set and the second set is empty, sort the selected side link resources according to time.
The apparatus according to claim 5, wherein the sending unit uses the resource that is the first in time among the sorted side link resources for the initial transmission of the transmission block, and the i+1th resource in time The resource is used for the i-th retransmission; where 1≤i≤N 1 -1, and N 1 is the number of side link resources after sorting.
The apparatus according to claim 1, wherein when the maximum number of resources N max that can be indicated in the side link control information is 2, for the i-th side link resource after sorting, the corresponding side link The control information indicates the i-th side link resource and the (i+1)th side link resource;

Where 1≤i≤N 1 -1, N 1 is the number of the sorted link resources of said side; the N 1 to the first side of the sorted link resources corresponding side information indicates that the link control N 1 side link resource.
The apparatus according to claim 1, wherein when the maximum number of resources N max that can be indicated in the side link control information is 3, for the i-th side link resource after sorting,

If the time interval with the i+2th side link resource is within the second predetermined range, the corresponding side link control information indicates the i-th side link resource and the i+1th side link resource And the i+2th side link resource;

If the time interval with the i+2th side link resource is not within the second predetermined range, the corresponding side link control information indicates the i-th side link resource and the i+1th side link Road resources

Where 1≤i≤N 1 -2, N 1 is the number of the sorted link resources of said side; the N 1 to the first side of the sorted link resources corresponding side information indicates that the link control The N 1 th side link resource; for the N 1 -1 th side link resource after sorting, the corresponding side link control information indicates the N 1 -1 th side link resource and the N th side link resource 1 side link resource.
The device according to claim 2, wherein the selection unit is further configured to:

After selecting the nth resource, in the case where the intersection of the first set and the second set is empty, randomly select the n+1th side link from the first set with medium probability resource;

The n+1th side link resource and the side link resource in the same time slot as the n+1th side link resource are excluded from the side link resource set to form the first A collection

The n+2th side link resource is randomly selected from the first set with medium probability.
The device according to claim 9, wherein the sorting unit is further configured to:

In the case where N side link resources have been selected, sort the selected side link resources according to time; or,

In the case that the first set is empty, the selected side link resources are sorted according to time.
The apparatus according to claim 10, wherein the sending unit uses the resource that is the frontmost in time among the sorted side link resources for the initial transmission of the transmission block, and the i+1th in time The resource is used for the i-th retransmission; where 1≤i≤N 1 -1, and N 1 is the number of side link resources after sorting.
The device according to claim 1, wherein the selection unit is configured to:

Randomly select the n-th side link resource from the set of side link resources with medium probability; where 1≤n≤N-1, and N is the number of transmissions;

Excluding the nth side link resource and the side link resource in the same time slot as the nth side link resource from the side link resource set to form a first set;

The n+1th side link resource is randomly selected from the first set with medium probability.
The device according to claim 12, wherein the selection unit is further configured to:

When the retransmission based on the hybrid automatic repeat request feedback is enabled, the nth side link resource and the side link resource in the same time slot as the nth side link resource are combined, And the edge link resource in the same physical edge link feedback control channel period as the nth edge link resource is excluded from the edge link resource set to form the first set.
The device according to claim 12, wherein the selection unit is further configured to:

When retransmission based on hybrid automatic repeat request feedback is enabled, and M side link resources in the same physical side link feedback control channel period as the nth side link resource have been selected Next, the nth side link resource and the side link resource in the same time slot as the nth side link resource, and the nth side link resource in the same physical side chain The remaining side link resources in the channel feedback control channel period are excluded from the side link resource set to form the first set; M is a predetermined positive integer.
The device according to claim 12, wherein the sorting unit is further configured to:

In the case where N side link resources have been selected, sort the selected side link resources according to time; or,

In the case that the first set is empty, the selected side link resources are sorted according to time.
The apparatus according to claim 15, wherein the sending unit uses the resource that is the frontmost in time among the sorted side link resources for the initial transmission of the transmission block, and the i+1th in time The resource is used for the i-th retransmission; where 1≤i≤N 1 -1, and N 1 is the number of side link resources after sorting.
The apparatus according to claim 12, wherein, when the maximum number of resources N max that can be indicated in the side link control information is 2, for the i-th side link resource after sorting,

If the time interval with the i+1 th side link resource is within the second predetermined range, the corresponding side link control information indicates the i th side link resource and the i+1 th side link resource ；

If the time interval with the i+1 th side link resource is not within the second predetermined range, the corresponding side link control information indicates the i th side link resource;

Where 1≤i≤N 1 -1, N 1 is the number of the sorted link resources of said side; the N 1 to the first side of the sorted link resources corresponding side information indicates that the link control N 1 side link resource.
The apparatus according to claim 12, wherein, when the maximum number of resources N max that can be indicated in the side link control information is 3, for the i-th side link resource after sorting,

If the time interval with the i+1 th side link resource is not within the second predetermined range, the corresponding side link control information indicates the i th side link resource;

If the time interval with the i+1th side link resource is within the second predetermined range, but the time interval with the i+2th side link resource is not within the second predetermined range, then the corresponding edge The link control information indicates the i-th side link resource and the (i+1)th side link resource;

If the time interval from the i+2th side link resource is within the second predetermined range, the corresponding side link control information indicates the i-th side link resource and the i+1th side link resource Side link resources and the i+2th side link resource;

Where 1≤i≤N 1 -2, N 1 is the number of the sorted link resources of said side; the N 1 to the first side of the sorted link resources corresponding side information indicates that the link control the first side link resources the N 1; N-sorted for 1-1 sides link resources, the first time if the N 1 side link resources interval within the second predetermined range, then the corresponding edge The link control information indicates the N 1 -1 th side link resource and the N 1 th side link resource, if the time interval with the N 1 th side link resource is not within the second predetermined range , The corresponding side link control information indicates the N 1 -1th side link resource.
A method for selecting side link resources includes:

At least one side link resource is selected one by one from the set of side link resources according to the transmission times corresponding to the data packet to be sent; among them, when the number of selected side link resources is more than one, according to the selected one or Time-frequency resources of multiple side link resources to determine the currently selected side link resource set;

Sort the selected one or more side link resources according to time; and

Use the sorted one or more side link resources to send one or more transmission blocks.
A communication system including:

A terminal device, which successively selects at least one side link resource from the set of side link resources according to the number of transmissions corresponding to the data packet to be sent; wherein when the number of selected side link resources is more than one, The time-frequency resources of the selected one or more side link resources, determine the currently selected side link resource set; sort the selected one or more side link resources according to time; and use the sorted one or more Each side link resource transmits one or more transmission blocks.