WO2021087881A1

WO2021087881A1 - Method and apparatus for selecting sidelink resources

Info

Publication number: WO2021087881A1
Application number: PCT/CN2019/116320
Authority: WO
Inventors: 纪鹏宇; 张健; 李国荣; 张磊; 王昕�
Original assignee: 富士通株式会社; 纪鹏宇; 张健; 李国荣; 张磊; 王昕�
Priority date: 2019-11-07
Filing date: 2019-11-07
Publication date: 2021-05-14

Abstract

Provided in the embodiments of the present application are a method and apparatus for selecting sidelink resources. The method comprises: a terminal device selects one or more first sidelink resources for sidelink data, and according to the one or more first sidelink resources, selects a second sidelink resource for single subchannel transmission; or, selects a second sidelink resource for the single subchannel transmission, and selects one or more first sidelink resources for the sidelink data according to the second sidelink resource, wherein the single subchannel transmission at least indicates reservation information of the foremost starting resource in a time domain among the one or more first sidelink resources.

Description

Method and device for selecting side link resources

Technical field

The embodiments of the present 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 only supporting periodic services, NR V2X needs to support additional non-periodic services, which are bursty and unpredictable, and the size of data packets is not fixed; therefore, it may be due to non-periodic services. The resulting resource selection collision.

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:

A first selection unit, which selects one or more first side link resources for side link data; and

A second selection unit, which selects a second side link resource for single sub-channel transmission according to the one or more first side link resources; wherein the single sub-channel transmission at least indicates the one or more first side links The reservation information of the first starting resource in the time domain in the road resource.

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

The terminal device selects one or more first side link resources for the side link data; and

According to the one or more first side link resources, a second side link resource is selected for single subchannel transmission; wherein the single subchannel transmission at least indicates that the one or more first side link resources are in the time domain The reservation information of the top starting resource.

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

A second selection unit, which selects the second side link resource for single-subchannel transmission; and

A first selection unit, which selects one or more first side link resources for side link data according to the second side link resource; wherein, the single sub-channel transmission at least indicates the one or more first side link resources The reservation information of the first starting resource in the time domain among the side link resources.

The terminal device selects the second side link resource for single sub-channel transmission; and

According to the second side link resource, one or more first side link resources are selected for side link data; wherein, the single subchannel transmission at least indicates that the one or more first side link resources are The reservation information of the first starting resource in the time domain.

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

A terminal device, which selects one or more first side link resources for side link data, and selects a second side link resource for single-subchannel transmission according to the one or more first side link resources; or Single sub-channel transmission selects a second side link resource, and selects one or more first side link resources for side link data according to the second side link resource; wherein, the single sub-channel transmission at least indicates the one Or reservation information of the first starting resource in the time domain among the multiple first-side link resources.

One of the beneficial effects of the embodiments of the present application is that the terminal device selects one or more first side link resources for side link data; and selects the second side link resource for single subchannel transmission; wherein the single subchannel transmission is at least Indicate the reservation information of the first starting resource in the time domain among the one or more first side link resources. As a result, the side link resource selection mechanism can be improved, and in the resource pool where periodic and aperiodic services coexist, the probability of resource selection collision due to aperiodic services can be reduced.

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 implementation 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 implementation of the embodiment of the application may be combined with the elements and features shown in one or more other drawings or implementations. 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 an example diagram of side link resource selection in an embodiment of the present application;

FIG. 5 is another example diagram of side link resource selection according to an embodiment of the present application;

FIG. 6 is another schematic diagram of a method for selecting side link resources according to an embodiment of the present application;

FIG. 7 is another example diagram of side link resource selection according to an embodiment of the present application;

FIG. 8 is a schematic diagram of a device for selecting side link resources according to an embodiment of the present application;

Fig. 9 is a schematic diagram of a network device according to an embodiment of the present application;

Fig. 10 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.

In addition, 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 terminal, which may be a certain UE, or may 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 simplicity, FIG. 1 only uses 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, 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 (called 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 preset _{Configuration; the set of R x, y} resources in all subframes in the entire selection window (hereinafter referred to as R _{x, y} candidate resources) is initialized and defined as Set A.

The terminal device can 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 The detection result of Power) 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 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. Then a grant corresponding to this transmission is generated, and a demodulation and coding scheme (MCS, Modulation and Coding Scheme) is selected from the resources indicated 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, another grant is generated, and an MCS is selected for data retransmission among the resources indicated by it. 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 only supports periodic services, NR V2X needs to additionally support non-periodic services, which are bursty and unpredictable, and the size of data packets is not fixed. It is necessary to improve the side link resource selection mechanism, in the resource pool where periodic and aperiodic services coexist, to reduce the probability of resource selection collision due to aperiodic services. 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 a 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 (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 (may be called 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. The terminal device selects one or more first side link resources for the side link data; and

302. The terminal device selects a second side link resource for single subchannel transmission according to the one or more first side link resources; wherein the single subchannel transmission at least indicates the one or more first side link resources The reservation information of the first starting resource in the time domain in the road resource.

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 between 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, a transmission block (TB, Transmission Block) used as side link data may include one or multiple transmissions, and one or more first side link resources need to be selected. The first transmission that is the most advanced in time among the one or more transmissions is called the first transmission (referred to as the initial transmission for short, and the resources used by it are referred to as the initial resource hereinafter), and may also include one or Retransmitted multiple times.

The embodiment of the application supports the transmission of sub-channel reservation information, and supports the transmission of an additional reservation information before the initial transmission (hereinafter, to avoid confusion, it will be referred to as the zeroth transmission or single sub-channel transmission). Indicates the resources used for the initial transmission (and possibly subsequent retransmissions). That is, the resources indicated by the SCI carried by the single sub-channel transmission include at least the information of the earliest resource in time among the resources of the first side link.

It is worth noting that the terms such as the zeroth transmission and initial transmission (first transmission) in this application are only defined for the convenience of description, and this application is not limited to this; for example, the single sub-channel transmission can also be referred to as the first transmission. One-time transmission or initial transmission; in addition, the initial transmission (first transmission) of this application can refer to one transmission to the same TB (only once), or it can refer to multiple transmissions to the same TB (required multiple times). For the first sending, the following will no longer distinguish between one-time sending and multiple sending.

In this way, the resources to be used by the current terminal device can be notified to other terminal devices in advance, so that other terminal devices can exclude the indicated part of the resource from the candidate set during the resource selection process. For aperiodic services, such a mechanism can avoid or reduce collisions caused by sending aperiodic services.

When the frequency domain resource required for the actual data to be sent is greater than 1 subchannel, the frequency domain size (size) of the zeroth transmission and subsequent transmissions is actually different. In LTE V2X, because the size of initial transmission and retransmission resources are the same, the physical layer and MAC layer can select a candidate resource set through the same one-time resource selection process, and select two available resources for initial transmission and retransmission respectively. Retransmission.

However, in NR V2X, if the resource granularity is different (equivalent to the frequency domain resource size of the zeroth transmission is 1 subchannel, the frequency domain resource size of subsequent transmissions (one or more transmissions) is greater than 1 subchannel), It has an impact on the existing resource selection process and needs to be improved to ensure that the zeroth transmission (1 subchannel) and subsequent transmissions (greater than 1 subchannel) can select appropriate resources, and the zeroth transmission in the time domain (Single sub-channel transmission) comes first.

In the embodiment of this application, the resources used for subsequent transmissions (one or multiple transmissions) are selected first, and then the resources used for the zeroth transmission (single subchannel transmission) are selected. As a result, it is possible to avoid affecting data transmission as much as possible.

In some embodiments, the second side link resource is located before the start resource in the time domain and the time interval between the second side link resource and the start resource is greater than or equal to a time threshold (for example, a time slot is used as a unit). , But not limited to this, can also be in milliseconds or symbols); the time threshold is predefined or preconfigured or configured, and/or, the time threshold can be successfully processed according to other terminal devices The processing time of the single sub-channel transmission is determined.

In some embodiments, the single subchannel sends reservation information indicating at least one time-frequency resource (including the starting resource); the time between the second side link resource and the at least one time-frequency resource The intervals are less than or equal to the maximum time interval that can be indicated by the side link control information (SCI).

For example, if the SCI can carry 4-bit reservation information, the maximum time interval is 15 time slots (or milliseconds).

The following schematically describes how to select the first side link resource and the second side link resource.

In some embodiments, the terminal device obtains the first resource candidate set in the first resource selection window according to the frequency domain resource granularity of the side link data, and selects from the first resource candidate set according to the number of repeated transmissions Output the one or more first side link resources.

For example, the physical layer performs the resource selection process for subsequent transmissions according to the frequency domain resource granularity notified by the MAC layer (when the granularity is greater than 1 subchannel) and the number of repeated transmissions of the same TB, the resource selection process for subsequent transmissions is performed, and the resource candidate set is obtained and then reported to MAC layer, MAC layer selects one or more available resources.

For example, the first resource selection window may start from the arrival time of the side link data or the first symbol in the next time slot or after a predetermined number of time slots, to the predetermined length from the starting time slot or the packet delay budget. (PDB) The last symbol of the length included in the resource pool ends; but this application is not limited to this.

Regarding the selection of the first side link resource and the first resource selection window, etc., please refer to the aforementioned Figure 2 and related content. For example, the selection process of the first side link resource can refer to the content in the aforementioned 3GPP TS 36.213 V15.2.0 at 14.1.1.6, etc.; the first resource selection window can refer to the start position, end position, and end position of the selection window in Figure 2 The length can also be appropriately modified on the basis of the selection window in Fig. 2.

After obtaining one or more first side link resources, the terminal device can determine whether it can send a single sub-channel transmission according to the one or more first side link resources; and if it can send the single sub-channel transmission, The single sub-channel transmission selects the second side link resource.

In some embodiments, the terminal device determines that the time interval between the start resource in the one or more first side link resources and the start position of the resource selection window is greater than or equal to the time threshold value, the terminal device determines that it can send The single sub-channel transmission.

For example, if the first resource among the selected first side link resources, the time interval from the start position of the selection window is less than the processing time (for example, it can be T1 in Figure 2, or it can be different from T1 in Figure 2), Then the single sub-channel transmission is disabled, that is, it is judged that the function is disabled at this time, and the protocol data unit (PDU, Protocol Data Unit) generated by the MAC layer can be directly loaded in the subsequent resources for transmission.

In other embodiments, in addition to considering the time threshold, the terminal device may also determine whether the single sub-channel transmission can be sent according to at least one of the following information: quality of service (QoS, Quality of Service), service priority , Resource pool congestion information, whether the resource pool is open; etc. This application does not limit these factors.

After obtaining one or more first side link resources, and after determining that the single sub-channel transmission can be sent, the terminal device may select the second side link for single sub-channel transmission according to the one or more first side link resources Road resources.

In some embodiments, the terminal device uses a single subchannel as the granularity, obtains the second resource candidate set from the remaining resources after excluding the resources in the first resource candidate set from the first resource selection window, and obtains the second resource candidate set from all the resources. The second side link resource is selected from a plurality of resources located before the start resource in the second resource candidate set; wherein the time interval between the plurality of resources and the start resource is greater than or Equal to the time threshold and less than or equal to the maximum time interval that the side link control information (SCI) can indicate.

For example, the terminal device can determine whether it can send a single sub-channel transmission according to one or more first-side link resources. For specific determination, please refer to the foregoing content. In the case where it is determined that single sub-channel transmission can be sent, the terminal device again uses 1 sub-channel as the frequency domain granularity, and the number of transmissions is 1, and performs another resource selection among the remaining resources in the original selection window.

After the MAC layer obtains the resource candidate set, it is within the subset of resources in the set that meets condition 1 (that is, the time interval from the starting resource is greater than or equal to the time threshold and less than or equal to the maximum time interval that the SCI can indicate) in the set , Randomly select a resource for single sub-channel transmission. If the resource subset is empty, it can also be determined that single-subchannel transmission is disabled.

In other embodiments, the terminal device uses a single subchannel as the granularity, obtains a second resource candidate set in a second resource selection window located before the start resource, and selects all resources from the second resource candidate set. The second side link resource.

For example, the time interval between the start position of the second resource selection window and the start resource is equal to the maximum time interval that can be indicated by side link control information (SCI), and the end position of the second resource selection window The time interval from the starting resource is equal to the time threshold; however, this application is not limited to this.

For example, it can be considered that the selection window for single sub-channel transmission is the time domain that satisfies condition 1 (that is, the time interval with the starting resource is greater than or equal to the time threshold and less than or equal to the maximum time interval that can be indicated by the SCI) The intersection set of the range window and the original selection window is used as a new selection window for resource selection, so as to obtain resources for single sub-channel transmission.

Regarding the selection process of the second side link resource, etc., you can also refer to the aforementioned Figure 2 and related content.

Fig. 4 is an example diagram of side link resource selection in an embodiment of the present application. As shown in Fig. 4, two first side link resources (frequency size greater than 1 subchannel) can be selected through a resource selection process, where Time-frequency resource 1 (starting resource) is used for initial transmission, and time-frequency resource 2 is used for retransmission. Then the second side link resource (frequency size equal to 1 subchannel) is selected through another resource selection process, as shown in time-frequency resource 3 in FIG. 4.

In some embodiments, the terminal device determines the initial RSRP when selecting the second resource candidate set according to the reference signal received power (RSRP, Reference Signal Received Power) threshold determined when selecting the first resource candidate set Threshold value.

For example, in the resource selection process of selecting subsequent resources (one or more transmissions), the candidate resource in the selection window may perform 0 to N operations on the RSRP threshold + 3dB (for example, the initial RSRP threshold is V ₀ , it becomes V _N after performing N operations; in the process of selecting resources for single sub-channel transmission, the RSRP threshold can use this V _N as the initial RSRP threshold instead of increasing _{from V 0.}

The above schematically illustrates that the resources for single sub-channel transmission and subsequent transmission (one or multiple transmissions) are obtained through two independent resource selection processes, but this application is not limited to this, and can also be obtained through one resource selection process, as shown below Sexual description.

Regarding the content of the side link resource selection process, you can also refer to the aforementioned Figure 2 and related content.

Then, the terminal device selects an edge link resource from the remaining resources after excluding the selected one or more first edge link resources from the first resource candidate set, and the edge link resource is the same as the The time interval between the starting resources is greater than or equal to the time threshold and less than or equal to the maximum time interval that can be indicated by the side link control information (SCI); and one of the side link resources is used as a subchannel resource The second side link resource.

For example, the terminal device can determine whether it can send a single sub-channel transmission according to one or more first-side link resources. For specific determination, please refer to the foregoing content. In the case where it is determined that single sub-channel transmission can be sent, the MAC layer determines a resource subset from the candidate resource set remaining after removing the selected resource from the previous resource set (the first resource candidate set), and the resources in the resource subset The condition 1 is met (that is, the time interval from the starting resource is greater than or equal to the time threshold and less than or equal to the maximum time interval that can be indicated by the SCI). Within the resource subset, a resource is randomly selected for single-subchannel transmission. If the resource subset is empty, it can also be determined that single-subchannel transmission is disabled.

Figure 5 is an example diagram of side link resource selection in an embodiment of the present application. As shown in Figure 5, a side link resource set (resource frequency size greater than 1 subchannel) can be selected through a resource selection process, from which Select time-frequency resource 1 (starting resource) for initial transmission, and time-frequency resource 2 for retransmission. Then, the time-frequency resource 3 is selected according to the time-frequency resource 1, and a sub-channel resource of the time-frequency resource 3 is used as the second side link resource (the frequency size is equal to 1 sub-channel).

In some embodiments, the frequency domain index of the sub-channel resource in the selected side link resource is the lowest, or the frequency domain index of the sub-channel resource in the selected side link resource highest. However, this application is not limited to this, and a resource with a frequency domain position as an intermediate position can also be selected.

For example, the physical layer selects a sub-channel as the resource for single-sub-channel transmission among the additionally selected resources at the top position in the time domain. Specifically, it may indicate the sub-channel with the lowest or highest number in the frequency domain in the indicated resource, or , Is the sub-channel resource configured or pre-configured in the selected side link resource, and the present application is not limited to this.

In some embodiments, the single subchannel transmission also carries a part of the side link data.

For example, the MAC layer only generates PDUs according to the resource size of the subsequent transmission, and the physical layer encodes the PDU according to the corresponding MCS and TB size in subsequent transmissions and generates TBs for transmission; in single-subchannel transmission, the physical layer can be based on the zeroth time The transmitted size (1 sub-channel) and the indicated MCS will load part of the TB on the selected single-sub-channel transmission resource. For example, these bits may be the first X bits of the entire TB, which are obtained through rate matching, but the application is not limited to this.

In some embodiments, if the subsequent transmission triggers the resource reselection, if the single subchannel transmission does not meet the condition 1 (that is, the time interval from the starting resource is greater than or equal to the time threshold, and less than or equal to the SCI can The maximum time interval indicated), the single sub-channel transmission will also trigger the resource reselection process.

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 one or more first side link resources for side link data; and selects the second side link resource for single subchannel transmission; wherein the single subchannel transmission at least indicates the one or more Reservation information of the first starting resource in the time domain among the multiple first-side link resources. As a result, the side link resource selection mechanism can be improved, and in the resource pool where periodic and aperiodic services coexist, the probability of resource selection collision due to aperiodic services can be reduced.

Embodiments of the second aspect

The embodiments of this application are described on the basis of the embodiments of the first aspect, and the same content as the embodiments of the first aspect will not be repeated here. In the embodiment of the present application, the resource used for the zeroth transmission (single subchannel transmission) is selected first, and then the resource used for subsequent transmissions (one or more transmissions) is selected.

FIG. 6 is a schematic diagram of a method for selecting side link resources according to an embodiment of the present application. As shown in FIG. 6, the method includes:

601: A terminal device selects a second side link resource for single sub-channel transmission; and

602. The terminal device selects one or more first side link resources for side link data according to the second side link resource; wherein, the single sub-channel transmission at least indicates the one or more first side link resources. The reservation information of the first starting resource in the time domain among the side link resources.

It is worth noting that Figure 6 above only schematically illustrates the embodiments of the present application, but the present application is not limited thereto. For example, the order of execution between 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. 6.

In some embodiments, the second side link resource is located before the start resource in the time domain and the time interval between it and the start resource is greater than or equal to a time threshold; the time threshold is predefined or Pre-configured or configured, and/or, the time threshold is determined according to the processing time for other terminal devices to successfully process the transmission of the single subchannel.

In the embodiment of the present application, the resources used for single-subchannel transmission are selected first, and then the resources used for subsequent transmission are selected. The resources for single-subchannel transmission and subsequent transmission are selected through two independent processes. A schematic description is given below.

In some embodiments, the terminal device uses a single subchannel as the granularity to obtain a second resource candidate set in the first resource selection window, and select the second side link resource from the second resource candidate set.

For example, the first resource selection window starts from the arrival time of the side link data or the first symbol in the next time slot or after a predetermined number of time slots, to a predetermined length or packet distance from the starting time slot. The last symbol of the time delay budget (PDB) length included in the resource pool ends; but the application is not limited to this.

In some embodiments, the terminal device randomly selects the second side link resource from multiple side link resources that are earlier in time in the second resource candidate set.

For example, according to the random selection rule and/or the principle of first time, among the first or the first two (or the first N) candidate resources in the second resource candidate set, random selection is performed to obtain The single sub-channel transmission resources to be used.

In some embodiments, the terminal device obtains the second resource candidate set in one or more time slots within a period of time earlier in the first resource selection window.

For example, only in the first or the first two (or first N) time slots in the selection window or in the first M% of the selection window, the resources for single subchannel transmission are selected; this application does not Limited to this, the period of time before the time can also be the first M symbols, and so on. Here, the selection of the second side link resource can be performed randomly by the physical layer.

Regarding the selection of the second side link resource and the first resource selection window, etc., please refer to the aforementioned Figure 2 and related content. After obtaining the second side link resource, the terminal device selects one or more side link resources for subsequent transmission according to the second side link resource.

In some embodiments, the terminal device obtains the first resource candidate set in the third resource selection window located after the second side link resource according to the frequency domain resource granularity of the side link data, and according to the repeated transmission The number of times the one or more first side link resources are selected from the first resource candidate set.

For example, the time interval between the start position of the third resource selection window and the second side link resource is equal to the time threshold; the end position of the third resource selection window is the same as the first resource selection The end positions of the windows are the same, or the end position of the first resource selection window plus the offset value of the start position of the third resource selection window relative to the start position of the first resource selection window. But this application is not limited to this.

For example, for subsequent transmissions, the selection window is reduced to the time slot where the resource sent from the single subchannel is located, and the next time slot after adding a processing time based on the UE capability starts until the last slot of the original selection window ends (n+T2 ). Then, using the resource size indicated by the MAC layer as the granularity (open when the granularity is greater than 1 subchannel), perform another resource selection process to select one or more resources for subsequent transmissions, where the physical layer still sets resource candidates It is reported to the MAC layer, and the MAC layer performs the selection of the first-side link resource.

Regarding the selection process of the first side link resource, refer to the aforementioned Figure 2 and related content.

FIG. 7 is an example diagram of side link resource selection according to an embodiment of the present application. As shown in FIG. 7, the second side link resource (frequency size is equal to 1 subchannel) can be selected through a resource selection process, as shown in FIG. 7 The time-frequency resource shown is 3. Then two first side link resources (frequency size greater than 1 subchannel) are selected through another resource selection process, where time-frequency resource 1 (starting resource) is used for initial transmission, and time-frequency resource 2 is used for retransmission.

In some embodiments, the terminal device determines the initial RSRP threshold when selecting the first resource candidate set according to the RSRP threshold determined when selecting the second resource candidate set.

For example, in the process of selecting resources for single sub-channel transmission, it is possible to perform 0 to N operations on RSRP threshold +3dB (for example, the initial RSRP threshold is V ₀ , then it becomes V _{N after performing N operations.} ); In the resource selection process of selecting subsequent resources (one or multiple transmissions), the RSRP threshold can use the V _N as the initial RSRP threshold, instead of increasing _{from V 0.}

In some embodiments, if the subsequent transmission triggers the resource reselection, if the single subchannel transmission does not meet the condition 1 (that is, the time interval from the starting resource is greater than or equal to the time threshold, and less than or equal to the SCI can The indicated maximum time interval), the resource reselection process will also be triggered.

It can be seen from the above embodiment that the terminal device selects one or more first side link resources for side link data; and selects the second side link resource for single subchannel transmission; wherein the single subchannel transmission at least indicates the one or more Reservation information of the first starting resource in the time domain among the multiple first-side link resources. As a result, the side link resource selection mechanism can be improved, and in the resource pool where periodic and aperiodic services coexist, the probability of resource selection collision due to aperiodic services can be reduced.

Embodiments of the third aspect

The embodiment of the present application provides a device for selecting side link resources. The apparatus may be, for example, a terminal device (such as 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. 8 is a schematic diagram of a device for selecting side link resources according to an embodiment of the present application. As shown in FIG. 8, the device 800 for selecting side link resources includes:

A first selection unit 801, which selects one or more first side link resources for side link data; and

A second selection unit 802, which selects a second side link resource for single subchannel transmission according to the one or more first side link resources; wherein the single subchannel transmission at least indicates the one or more first side links The reservation information of the first starting resource in the time domain in the link resource.

In some embodiments, the second side link resource is located before the start resource in the time domain and the time interval between it and the start resource is greater than or equal to a time threshold; the time threshold It is predefined or preconfigured or configured, and/or the time threshold is determined according to the processing time that other terminal devices can successfully process the transmission of the single subchannel.

In some embodiments, the single-subchannel transmission indication includes reservation information of at least one time-frequency resource of the starting resource; the time interval between the second side link resource and the at least one time-frequency resource Both are less than or equal to the maximum time interval that can be indicated by the side link control information.

In some embodiments, the first selection unit 801 obtains the first resource candidate set within the first resource selection window according to the frequency domain resource granularity of the side link data, and obtains the first resource candidate set from the first resource candidate according to the number of repeated transmissions. The one or more first side link resources are selected from the set.

In some embodiments, as shown in FIG. 8, the device 800 for selecting side link resources further includes:

A determining unit 803, which determines whether the single-subchannel transmission can be sent according to the one or more first side link resources; and

The second selection unit 802 selects a second side link resource for the single subchannel transmission when the single subchannel transmission can be transmitted.

In some embodiments, the determining unit 803 determines that the time interval between the start resource in the one or more first side link resources and the start position of the resource selection window is greater than or equal to the time threshold Next, it is determined that the single sub-channel transmission can be sent.

In some embodiments, the determining unit 803 also determines whether the single sub-channel transmission can be sent according to at least one of the following information: service quality, service priority, resource pool congestion information, and whether the resource pool is enabled.

In some embodiments, the second selection unit 802 uses a single subchannel as the granularity to obtain the second resource candidate set from the remaining resources after excluding the resources in the first resource candidate set from the first resource selection window, And selecting the second side link resource from a plurality of resources located before the start resource in the second resource candidate set; wherein, the time between the plurality of resources and the start resource The interval is greater than or equal to the time threshold and less than or equal to the maximum time interval that can be indicated by the side link control information.

In some embodiments, the second selection unit 802 uses a single subchannel as the granularity to obtain a second resource candidate set in a second resource selection window located before the start resource, and selects from the second resource candidate set Output the second side link resource.

In some embodiments, the determining unit 803 is further configured to determine the initial reference signal reception during the selection of the second resource candidate set according to the reference signal received power threshold determined during the selection of the first resource candidate set. Power threshold.

In some embodiments, the second selection unit 802 selects one side link from the remaining resources after excluding one or more first side link resources selected by the first selection unit 801 from the first resource candidate set Resource, the time interval between the side link resource and the start resource is greater than or equal to a time threshold and less than or equal to the maximum time interval that can be indicated by the side link control information; and the side link One sub-channel resource in the resources is used as the second side link resource.

In some embodiments, the frequency domain index of the sub-channel resource in the selected side link resource is the lowest, or the frequency domain index of the sub-channel resource in the selected side link resource The highest, or, is a sub-channel resource configured or pre-configured in the selected 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 to this. The device 800 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. 8 only exemplarily shows the connection relationship or signal direction between the 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 can 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.

Embodiment of the fourth aspect

The embodiment of the present application provides a device for selecting side link resources. The apparatus 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 second aspect will not be repeated.

For the device for selecting side link resources in the embodiment of the present application, reference may be made to FIG. 8. The second selection unit 802 selects the second side link resource for single-subchannel transmission; and the first selection unit 801 selects one or more first side link resources for the side link data according to the second side link resource; Wherein, the single sub-channel transmits reservation information indicating at least the first starting resource in the time domain among the one or more first side link resources.

In some embodiments, the second side link resource is located before the start resource in the time domain and the time interval between it and the start resource is greater than or equal to a time threshold; the time threshold It is pre-defined or pre-configured or configured, and/or the time threshold is determined according to the processing time for other terminal devices to successfully process the transmission of the single sub-channel.

In some embodiments, the second selection unit 802 obtains a second resource candidate set in the first resource selection window with a single subchannel granularity, and selects the second side link from the second resource candidate set Resources.

In some embodiments, the second selection unit 802 randomly selects the second side link resource from a plurality of side link resources that are earlier in time in the second resource candidate set; and/or, in the The second resource candidate set is obtained in one or more time slots earlier in time in the first resource selection window.

In some embodiments, the first selection unit 801 obtains a first resource candidate set in a third resource selection window located after the second side link resource according to the frequency domain resource granularity of the side link data, and The one or more first side link resources are selected from the first resource candidate set according to the number of repeated transmissions.

In some embodiments, the determining unit 803 determines the initial reference signal received power during the selection of the first resource candidate set according to the reference signal received power threshold determined during the selection of the second resource candidate set. Threshold value.

Embodiments of the fifth aspect

An embodiment of the present application also provides a communication system, which may refer to FIG. 1, and the same content as the embodiments of the first aspect to the fourth aspect will not be repeated.

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

A terminal device, which selects one or more first side link resources for side link data, and selects a second side link resource for single sub-channel transmission according to one or more first side link resources; wherein, the single sub-channel The channel sends reservation information indicating at least the first starting resource in the time domain among the one or more first side link resources.

Or, it selects the second side link resource for single subchannel transmission, and selects one or more first side link resources for side link data according to the second side link resource; wherein, the single subchannel transmission is at least Indicates the reservation information of the first starting resource in the time domain among the one or more first-side link resources.

The embodiment of the present application also provides 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. 9 is a schematic diagram of the structure of a network device according to an embodiment of the present application. As shown in FIG. 9, the network device 900 may include: a processor 910 (for example, a central processing unit CPU) and a memory 920; the memory 920 is coupled to the processor 910. The memory 920 can store various data; in addition, it also stores an information processing program 930, and the program 930 is executed under the control of the processor 910.

In addition, as shown in FIG. 9, the network device 900 may further include: a transceiver 940 and an antenna 950, etc.; wherein the functions of the above-mentioned components are similar to those of the prior art, and will not be repeated here. It should be noted that the network device 900 does not necessarily include all the components shown in FIG. 9; in addition, the network device 900 may also include components not shown in FIG. 9, and the prior art can be referred to.

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

Fig. 10 is a schematic diagram of a terminal device according to an embodiment of the present application. As shown in FIG. 10, the terminal device 1000 may include a processor 1010 and a memory 1020; the memory 1020 stores data and programs, and is coupled to the processor 1010. 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 1010 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 1010 may be configured to perform the following control: select one or more first side link resources for side link data, and select the first side link resource for single subchannel transmission according to the one or more first side link resources Two-side link resources; wherein the single subchannel transmits reservation information indicating at least the first starting resource in the time domain among the one or more first-side link resources.

For example, the processor 1010 may be configured to execute a program to implement the method for selecting side link resources as described in the embodiment of the second aspect. For example, the processor 1010 may be configured to perform the following control: selecting a second side link resource for single subchannel transmission, and selecting one or more first side links for side link data according to the second side link resource Resources; wherein the single sub-channel transmits reservation information indicating at least the first starting resource in the time domain among the one or more first side link resources.

As shown in FIG. 10, the terminal device 1000 may further include: a communication module 1030, an input unit 1040, a display 1050, and a power supply 1060. 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 1000 does not necessarily include all the components shown in FIG. 10, and the above-mentioned components are not necessary; in addition, the terminal device 1000 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 perform the side link resource selection according to the embodiments of the first to second aspects method.

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 embodiments of the first to second aspects.

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 described in the drawings and/or one or more combinations of the functional blocks 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, or multiple micro-processing Processor, one or more microprocessors in communication with the DSP, or any other such configuration.

The application has been 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:

The terminal device selects a second side link resource for single subchannel transmission according to the one or more first side link resources; wherein the single subchannel transmission at least indicates the one or more first side link resources The reservation information of the first starting resource in the time domain.

Supplement 2. The method according to Supplement 1, wherein the second side link resource is located before the start resource in the time domain and the time interval between the second side link resource and the start resource is greater than or equal to the time gate Limit.

Appendix 3. The method according to Appendix 2, wherein the time threshold is pre-defined or pre-configured or configured, and/or the time threshold is based on the ability of other terminal devices to successfully process The processing time for the transmission of the single subchannel is determined.

Supplement 4. The method according to Supplement 2 or 3, wherein the time threshold is in units of time slots or milliseconds or symbols.

Supplement 5. The method according to Supplements 1 to 4, wherein the single-subchannel transmission instruction includes reservation information of at least one time-frequency resource of the starting resource; The time interval between the at least one time-frequency resource is less than or equal to the maximum time interval that can be indicated by the side link control information (SCI).

Supplement 6. The method according to any one of Supplements 1 to 5, wherein the method further includes:

The terminal device obtains the first resource candidate set in the first resource selection window according to the frequency domain resource granularity of the side link data, and

The one or more first side link resources are selected from the first resource candidate set according to the number of repeated transmissions.

Appendix 7. The method according to Appendix 6, wherein the first resource selection window starts from the arrival time of the side link data or the first symbol of the next time slot or a predetermined number of time slots. At the beginning, it ends with the last symbol included in the resource pool of the predetermined length from the start time slot or the packet delay budget (PDB) length.

Supplement 8. The method according to any one of Supplements 1 to 7, wherein the method further comprises:

The terminal device determines whether the single sub-channel transmission can be sent according to the one or more first side link resources; and

Selecting a second side link resource for the single subchannel transmission in the case that the single subchannel transmission can be transmitted.

Supplement 9. The method according to Supplement 8, wherein the time between the start resource of the one or more first side link resources and the start position of the resource selection window of the terminal device When the interval is greater than or equal to the time threshold, it is determined that the single sub-channel transmission can be sent.

Supplement 10. The method according to Supplement 8 or 9, wherein the terminal device also determines whether it can send the single sub-channel transmission according to at least one of the following information: service quality, service priority, resource pool congestion information , Whether the resource pool is turned on.

Supplement 11. The method according to any one of Supplements 6 to 10, wherein the method further includes:

The terminal device uses a single subchannel as the granularity to obtain a second resource candidate set from the remaining resources after excluding the resources in the first resource candidate set from the first resource selection window, and

The second side link resource is selected from a plurality of resources located before the start resource in the second resource candidate set; wherein, the time interval between the plurality of resources and the start resource It is greater than or equal to the time threshold and less than or equal to the maximum time interval that the side link control information (SCI) can indicate.

Supplement 12. The method according to any one of Supplements 6 to 10, wherein the method further comprises:

The terminal device obtains a second resource candidate set in a second resource selection window located before the start resource with a single subchannel as the granularity, and

The second side link resource is selected from the second resource candidate set.

Appendix 13. The method according to Appendix 12, wherein the time interval between the start position of the second resource selection window and the start resource is equal to the maximum value that can be indicated by the side link control information (SCI) Time interval, the time interval between the end position of the second resource selection window and the start resource is equal to the time threshold.

Supplement 14. The method according to any one of Supplements 11 to 13, wherein the method further includes:

The terminal device determines the initial RSRP threshold when selecting the second resource candidate set according to the reference signal received power (RSRP) threshold determined when selecting the first resource candidate set.

Supplement 15. The method according to any one of Supplements 6 to 10, wherein the method further includes:

The terminal device selects an edge link resource from the remaining resources after excluding the selected one or more first edge link resources from the first resource candidate set, and the edge link resource is the same as the remaining resources. The time interval between the starting resources is greater than or equal to the time threshold and less than or equal to the maximum time interval that can be indicated by the side link control information (SCI); and

Use one sub-channel resource in the side link resource as the second side link resource.

Appendix 16. The method according to Appendix 15, wherein the frequency domain index of the sub-channel resource in the selected side link resource is the lowest, or the sub-channel resource is in the selected side link resource. The frequency domain index in the side link resource is the highest, or it is a subchannel resource configured or pre-configured in the selected side link resource.

Supplement 17. The method according to any one of Supplements 1 to 16, wherein the single sub-channel transmission also carries a part of the side link data.

Supplement 18. A method for selecting side link resources includes:

The terminal device selects one or more first side link resources for side link data according to the second side link resource; wherein, the single sub-channel transmission at least indicates the one or more first side link resources The reservation information of the first starting resource in the time domain in the road resource.

Appendix 19. The method according to appendix 18, wherein the second side link resource is located before the start resource in the time domain and the time interval between the second side link resource and the start resource is greater than or equal to the time gate Limit.

Supplement 20. The method according to Supplement 19, wherein the time threshold is predefined or preconfigured or configured, and/or the time threshold is processed successfully according to other terminal equipment. The processing time of the transmission of the channel is determined.

Supplement 21. The method according to Supplement 19 or 20, wherein the time threshold is in units of time slots or milliseconds or symbols.

Supplement 22. The method according to any one of Supplements 18 to 21, wherein the single subchannel transmission instruction includes reservation information of at least one time-frequency resource of the starting resource; the second side link The time interval between the resource and the at least one time-frequency resource is less than or equal to the maximum time interval that can be indicated by the side link control information (SCI).

Supplement 23. The method according to any one of Supplements 18 to 22, wherein the method further includes:

The terminal device obtains a second resource candidate set in the first resource selection window with a single sub-channel as the granularity, and

Supplement 24. The method according to Supplement 23, wherein the first resource selection window is selected from the arrival time of the side link data or the first symbol of the next time slot or a predetermined number of time slots. At the beginning, it ends with the last symbol included in the resource pool of the predetermined length from the start time slot or the packet delay budget (PDB) length.

Supplement 25. The method according to Supplement 23 or 24, wherein the terminal device randomly selects the side link resources from a plurality of side link resources within a period of time earlier in the second resource candidate set Link resources on the second side.

Supplement 26. The method according to any one of Supplements 23 to 25, wherein the terminal device obtains the second resource in one or more time slots earlier in the first resource selection window Candidate set.

Supplement 27. The method according to any one of Supplements 23 to 26, wherein the method further includes:

The terminal device obtains a first resource candidate set in a third resource selection window located after the second side link resource according to the frequency domain resource granularity of the side link data, and

Appendix 28. The method according to Appendix 27, wherein the time interval between the start position of the third resource selection window and the second side link resource is greater than or equal to a time threshold; The end position of the third resource selection window is the same as the end position of the first resource selection window, or is the end position of the first resource selection window plus the start position of the third resource selection window relative to the The offset value of the start position of the first resource selection window.

Supplement 29. The method according to Supplement 27 or 28, wherein the method further includes:

The terminal device determines the initial RSRP threshold when selecting the first resource candidate set according to the RSRP threshold determined when selecting the second resource candidate set.

Supplement 30. The method according to any one of Supplements 18 to 29, wherein the single sub-channel transmission also carries a part of the side link data.

Appendix 31. 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 side described in any one of appendix 1 to 30 Selection method of link resources.

Claims

A device for selecting side link resources includes:

A first selection unit, which selects one or more first side link resources for side link data; and

A second selection unit, which selects a second side link resource for single sub-channel transmission according to the one or more first side link resources; wherein the single sub-channel transmission at least indicates the one or more first side links The reservation information of the first starting resource in the time domain in the road resource.
The apparatus according to claim 1, wherein the second side link resource is located before the start resource in the time domain and a time interval between the second side link resource and the start resource is greater than or equal to a time threshold;

The time threshold is predefined or preconfigured or configured, and/or the time threshold is determined according to the processing time that other terminal devices can successfully process the transmission of the single subchannel.
The apparatus according to claim 1, wherein the single-subchannel transmission instruction includes reservation information of at least one time-frequency resource of the starting resource; the second side link resource and the at least one time-frequency resource The time interval between is less than or equal to the maximum time interval that the side link control information can indicate.
The apparatus according to claim 1, wherein the first selection unit obtains the first resource candidate set in the first resource selection window according to the frequency domain resource granularity of the side link data, and obtains the first resource candidate set according to the number of repeated transmissions. The one or more first side link resources are selected from the first resource candidate set.
The device according to claim 1, wherein the device further comprises:

A determining unit, which determines whether the single sub-channel transmission can be sent according to the one or more first side link resources; and

The second selection unit selects a second side link resource for the single subchannel transmission when the single subchannel transmission can be transmitted.
The apparatus according to claim 5, wherein the time interval between the starting resource in the one or more first side link resources and the starting position of the resource selection window by the determining unit is greater than or equal to In the case of the time threshold, it is determined that the single-subchannel transmission can be sent.
The apparatus according to claim 6, wherein the determining unit further determines whether the single sub-channel transmission can be sent according to at least one of the following information: service quality, service priority, resource pool congestion information, and whether the resource pool is open.
The apparatus according to claim 4, wherein the second selection unit uses a single subchannel as a granularity to obtain from the remaining resources after excluding the resources in the first resource candidate set from the first resource selection window A second resource candidate set, and the second side link resource is selected from a plurality of resources located before the start resource in the second resource candidate set; wherein, the plurality of resources are related to the start resource; The time interval between initial resources is greater than or equal to the time threshold and less than or equal to the maximum time interval that can be indicated by the side link control information.
The apparatus according to claim 4, wherein the second selection unit uses a single subchannel as the granularity to obtain a second resource candidate set in a second resource selection window located before the start resource, and obtains a second resource candidate set from the first resource The second side link resource is selected from the second resource candidate set.
The apparatus according to claim 4, wherein the determining unit is further configured to determine to select the second resource candidate set according to the reference signal received power threshold determined when the first resource candidate set is selected The initial reference signal received power threshold at the time.
The apparatus according to claim 4, wherein the second selection unit excludes the one or more first side link resources selected by the first selection unit from the first resource candidate set A side link resource is selected from the remaining resources, and the time interval between the side link resource and the starting resource is greater than or equal to the time threshold and less than or equal to the maximum time that can be indicated by the side link control information Interval; and one sub-channel resource in the side link resource is used as the second side link resource.
The apparatus according to claim 11, wherein the frequency domain index of the sub-channel resource in the selected side link resource is the lowest, or the sub-channel resource is in the selected side link resource The frequency domain index in is the highest, or is a sub-channel resource configured or pre-configured in the selected side link resources.
A device for selecting side link resources includes:

A second selection unit, which selects the second side link resource for single-subchannel transmission; and

A first selection unit, which selects one or more first side link resources for side link data according to the second side link resource; wherein, the single sub-channel transmission at least indicates the one or more first side link resources The reservation information of the first starting resource in the time domain among the side link resources.
The apparatus according to claim 13, wherein the second side link resource is located before the start resource in the time domain and a time interval between the second side link resource and the start resource is greater than or equal to a time threshold;

The time threshold is predefined or preconfigured or configured, and/or the time threshold is determined according to the processing time for other terminal devices to successfully process the transmission of the single subchannel.
The apparatus according to claim 13, wherein the single-subchannel transmission instruction includes reservation information of at least one time-frequency resource of the starting resource; the second side link resource and the at least one time-frequency resource The time interval between is less than or equal to the maximum time interval that the side link control information can indicate.
The apparatus according to claim 13, wherein the second selection unit obtains a second resource candidate set within a first resource selection window with a single subchannel as the granularity, and selects all resources from the second resource candidate set. The second side link resource.
The apparatus according to claim 16, wherein the second selection unit randomly selects the second side link resource from a plurality of side link resources within a period of time earlier in the second resource candidate set ；

And/or, obtaining the second resource candidate set in one or more time slots earlier in time in the first resource selection window.
The apparatus according to claim 16, wherein the first selection unit obtains the first selection in a third resource selection window located after the second side link resource according to the frequency domain resource granularity of the side link data. A resource candidate set, and the one or more first side link resources are selected from the first resource candidate set according to the number of repeated transmissions.
The device according to claim 18, wherein the device further comprises:

The determining unit determines the initial reference signal received power threshold when selecting the first resource candidate set according to the reference signal receiving power threshold determined when selecting the second resource candidate set.
A communication system including:

A terminal device, which selects one or more first side link resources for side link data, and selects a second side link resource for single-subchannel transmission according to the one or more first side link resources; or Single sub-channel transmission selects a second side link resource, and selects one or more first side link resources for side link data according to the second side link resource; wherein, the single sub-channel transmission at least indicates the one Or reservation information of the first starting resource in the time domain among the multiple first-side link resources.