WO2021248421A1

WO2021248421A1 - Method and apparatus for selecting sidelink resources

Info

Publication number: WO2021248421A1
Application number: PCT/CN2020/095686
Authority: WO
Inventors: 张健; 王昕�; 张磊
Original assignee: 富士通株式会社; 张健; 王昕�; 张磊
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2021-12-16

Abstract

Provided are a method and apparatus for selecting sidelink resources. The method comprises: a terminal device receiving sidelink control information during a first time period; measuring a reference signal received power according to the sidelink control information; and according to the sidelink control information received during the first time period and the measured reference signal received power, determining a resource set during a second time period after the first time period.

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

For technologies related to vehicle communication, including V2X (Vehicle to Everything), P2X (Pedestrian to Everything), etc. (hereinafter may also be collectively referred to as V2X), the sending device can directly communicate with the receiving device through a sidelink. Currently, both Long Term Evolution (LTE) and New Radio (NR) systems support V2X communication, namely LTE V2X and NR V2X.

For side links, side link control information (SCI, Sidelink Control Information) is carried by the physical side link control channel (PSCCH, Physical Sidelink Control Channel), and side link data information is carried by the physical side link shared channel (PSSCH, Physical Sidelink Shared Channel), and the side link feedback information (ACK/NACK) is carried by the physical side link feedback channel (PSFCH, Physical Sidelink Feedback Channel). LTE V2X defines PSCCH and PSSCH. NR V2X defines PSCCH, PSSCH and PSFCH.

The sending device in the side link can autonomously select the time-frequency resource used for information transmission based on the sensing result. Among them, sensing includes monitoring (monitor) SCI, measuring reference signal received power (RSRP, Reference Signal Received Power), and measuring received signal strength indicator (RSSI, Received Signal Strength Indicator), etc. Through perception, resources that have been reserved by other devices can be avoided during resource selection, so collisions with side link transmissions of other devices can be avoided, thereby avoiding interference.

For autonomous resource selection, the existing technology includes the following solutions: full sensing, partial sensing, and random selection. For all sensing, the device senses in each subframe or time slot, which can effectively avoid interference, but continuous sensing means continuous power consumption. Although this is not a big problem for vehicle equipment in V2X, it is not a problem for pedestrians in P2X. Equipment, equipment power consumption is also an important factor to be considered. For partial sensing, the device does not need to sense in every subframe or time slot, but only needs to sense in part of the subframe or time slot, which is conducive to reducing power consumption of the device (power reduction), for example, for insufficient power supply P2X P2X transmission equipment for pedestrians can greatly save power. For random selection, the device may not perceive at all. These three methods are a compromise between avoiding interference and saving power to varying degrees. LTE V2X supports full perception, partial perception and random selection. NR V2X currently does not provide support for partial perception.

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

However, the inventor found that compared to LTE V2X, NR V2X has added some new features, such as: support for short-period services with more cycles, support for aperiodic services, and support for hybrid automatic repeat request (HARQ, Hybrid Automatic). Repeat reQuest) retransmission of feedback information (called HARQ-ACK). NR V2X currently does not support partial sensing, and traditional LTE V2X partial sensing methods cannot provide support for these new features of NR V2X.

More specifically, some of the traditional LTE V2X sensing methods cannot avoid certain resources reserved for short-period services. Therefore, collisions and the resulting interference cannot be avoided, which affects the reliability of P2X transmission and cannot protect the lives of pedestrians. Safety.

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 method for selecting side link resources is provided, including:

The terminal device receives the side link control information at the first time unit in the first time period;

Measuring the received power of the reference signal according to the side link control information, and

Determining a resource set in a second time period after the first time period according to the side link control information and the reference signal received power obtained based on the side link control information;

Wherein, the resource set does not include candidate resources meeting the following conditions: the resource set reserved by the side link control information and the periodic or aperiodic starting from the candidate resource in the second time period Resources overlap; the reference signal received power obtained based on the side link control information is higher than the first threshold; the period obtained based on the side link control information is less than the second threshold; A plurality of second time units after a time unit are not within the first time period, wherein the logical time interval between the second time unit and the first time unit is based on the logical period obtained by the period Integer multiples.

According to another aspect of the embodiments of the present application, there is provided a side link resource selection device, including:

A receiving unit, which receives side link control information in a first time unit within a first time period;

A measuring unit that measures the received power of the reference signal according to the side link control information, and

A selection unit, which determines a resource set in a second time period after the first time period according to the side link control information and the reference signal received power obtained based on the side link control information;

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

The terminal device monitors side link control information in the first sub-time period and the second sub-time period of the first time period; and

According to the side link control information received in the first sub-period and/or the second sub-period and the reference signal received power obtained based on the side link control information, the first sub-period The candidate resources that overlap with the side link resources reserved by the side link control information are excluded in the second time period after the first time period corresponding to the time period;

Wherein, a plurality of second time units after the first time unit in which the side link control information is received are not within the first time period, and the difference between the second time unit and the first time unit The logical time interval is an integer multiple of the logical period obtained based on the period indicated by the side link control information.

A monitoring unit that monitors side link control information in the first sub-time period and the second sub-time period of the first time period; and

The selection unit, which uses the side link control information received in the first sub-period and/or the second sub-period and the reference signal received power obtained based on the side link control information from Excluding candidate resources that overlap with the side link resources reserved by the side link control information in a second time period after the first time period corresponding to the first time period;

One of the beneficial effects of the embodiments of the present application is that the terminal device can exclude certain resources reserved by short-period services or aperiodic services, and therefore can avoid collisions and interference caused by them, thereby improving the reliability of side link transmission. sex.

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 scope of the spirit and terms of the appended claims, the implementation of this 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 resource selection and monitoring in an embodiment of the present application;

FIG. 3 is another schematic diagram of resource selection and monitoring in an embodiment of the present application;

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

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

Fig. 6 is a schematic diagram of a logical time unit of an embodiment of the present application;

FIG. 7 is a schematic diagram of partial perception in an embodiment of the present application;

FIG. 8 is an example diagram of resource selection in an embodiment of the present application;

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

FIG. 10 is another example diagram of resource selection in an embodiment of the present application;

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

FIG. 12 is another example diagram of resource selection in an embodiment of the present application;

FIG. 13 is another example diagram of resource selection in an embodiment of the present application;

FIG. 14 is another example diagram of resource selection in an embodiment of the present application;

FIG. 15 is another schematic diagram of a method for selecting side link resources according to an embodiment of the present application;

FIG. 16 is another schematic diagram of a method for selecting side link resources according to an embodiment of the present application;

FIG. 17 is another example diagram of resource selection in an embodiment of the present application;

FIG. 18 is another example diagram of resource selection in an embodiment of the present application;

FIG. 19 is a schematic diagram of a side link resource selection device according to an embodiment of the present application;

FIG. 20 is another schematic diagram of the side link resource selection device according to an embodiment of the present application;

FIG. 21 is a schematic diagram of a network device according to an embodiment of the present application;

FIG. 22 is a schematic diagram of a terminal device according to an embodiment of the present application.

detailed description

With reference to the drawings, the foregoing and other features of this application will become apparent through the following description. In the description 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 this 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 referred to 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 the present application, the singular forms "a" and "the" 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" may refer to a network that complies with any of the following communication standards, such as Long Term Evolution (LTE), Enhanced Long Term Evolution (LTE-A, LTE-Advanced), broadband 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 can include but is 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" can 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 can also be a machine or device that performs monitoring or measurement. For example, it can include, but is not limited to: Machine Type Communication (MTC, Machine Type Communication) terminals, Vehicle-mounted 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 one 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, 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 terminal devices and network devices are taken as examples. As shown in FIG. 1, a 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 in 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 of the network device 101 and the other terminal device 103 is outside the coverage of the network device 101 to perform side link transmission to implement V2X communication.

In the embodiment of this 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 (that is, Mode 2) and the allocation of side link resources by the network device (that is, Mode 1); this embodiment of the present application does not limit this.

In the embodiment of the present application, the time unit may be a subframe, a time slot, or a set containing at least one time domain symbol. The set of at least one time domain symbol can also be called a mini-slot or a non-slot. For example, the subframe and the time slot in the embodiment of this application can be used interchangeably, and the "time slot" can also be replaced with a "subframe". The application is not limited to this, and can also be replaced with other time units. In addition, the terms "time-frequency resource" and "resource" can be used interchangeably.

For partial sensing, the terminal device does not need to perform sensing in every time unit, so it can achieve the purpose of saving power. Here, the time unit may be a subframe, a time slot, or a set containing at least one time domain symbol. Perception includes monitoring SCI, measuring RSRP, etc. There are multiple equivalent expressions for monitoring SCI in a certain time unit, such as monitoring a certain time unit, receiving SCI in a certain time unit, blindly detecting SCI in a certain time unit, and so on. The SCI can be the SCI in LTE V2X, or the first stage SCI (SCI format 1A) in NR V2X, and this application is not limited to this.

For the traditional partial perception method, that is, partial perception in LTE V2X, the physical layer of the terminal device receives a request from a higher layer (for example, the MAC layer) at time unit n, within the resource selection window [n+T ₁ ,n+T ₂ ] Make resource selection. More specifically, the terminal device determines a second time period that includes one or more time units in the resource selection window, and performs sensing in the first time period that includes one or more time units before the resource selection window. As a result, resource selection is performed in the second time period.

The terminal equipment performs side link transmission in a resource pool. All the time-frequency resources in the resource pool are shown in the following example diagrams in this article. A resource pool includes at least one time unit in the time domain, at least one subchannel or at least one resource block (RB, Resource Block) in the frequency domain. One subchannel includes at least one RB in the frequency domain. Candidate resource R _{x, y} is the time unit in the second time period

There are consecutive L _subCH subchannels including subchannel x+j (j=0,...,L _{subCH -1).}

It is assumed that the first resource set includes all candidate resources, where the candidate resources are time-frequency resources that can be used for side link transmission. The terminal device excludes candidate resources that overlap with resources reserved by other devices from the first resource set, and excludes candidate resources that cannot be used for side link transmission due to other reasons, to obtain the second resource set. The physical layer reports the determined second resource set to the higher layer. The terminal device further determines the resource used for side link transmission in the second resource set. Or the terminal device reports the second resource set to the base station for the base station to schedule side link transmission.

Figure 2 is a schematic diagram of resource selection and monitoring in an embodiment of the present application. As shown in Figure 2, the terminal device only needs to perform sensing in the first time period, so it is called partial sensing. The first time period may include multiple sub-time periods appearing in a periodic form. The time unit in each sub-period is not necessarily continuous in the resource pool. The time units in the second time period are not necessarily continuous in the resource pool.

For example, the terminal device needs to perform existing side link transmission within a certain time interval, or needs to receive information from the base station, or needs to perform radio frequency or baseband switching between cellular communication and side link communication, etc. The terminal device will not be able to perceive within this time interval, or it will not be able to perform resource selection and side link transmission. When the time unit in the first time period is not continuous in the resource pool, or the time unit in the sub-time period is not continuous in the resource pool, the existing partial sensing methods cannot avoid some resources reserved by short-period services. Here the short period means that the period is less than a certain period threshold.

FIG. 3 is another schematic diagram of resource selection and monitoring in an embodiment of the present application, and LTE V2X is taken as an example to illustrate the existing problems. For more details and stricter definitions, please refer to section 14.1.1.6 of TS 36.213 V15.9.0.

As shown in Figure 3, the sub-time periods are not continuous in the resource pool. Terminal equipment in subframe

Received SCI, the SCI not only indicates that it is located in the subframe

PSCCH/PSSCH resource, also indicates the following subframe

PSCCH/PSSCH resources; here can be referred to as the SCI (resource m) reserved resources m ₁ , m ₂ , m ₃ , m ₄ , m ₅ . The cycle of these resources is P _step ×P _{rsvp_RX} , where P _step ×P _{rsvp_RX} <P _step , that is, the SCI indicates a short cycle. Unless otherwise specified, the SCI mentioned in this article are all examples of SCI that indicate a short period.

According to the existing partial sensing method of LTE V2X, the terminal equipment will only exclude the short-period SCI when it receives the SCI indicating the short period _{in the fourth time period [y′-P step} -P _step ×P _{rsvp_RX} ,y′-P _step]. Candidate resources where the resources reserved by the SCI overlap, where the subframe

It is the last subframe of the second time period.

However, this will cause the following problem: Although the terminal device is in the sub-frame

The SCI is received, but because the SCI is not in the fourth time period, the terminal device will not exclude _{the candidate resources that overlap with the resources m 4} and m ₅ in the second time period, that is, it does not avoid being pre-prescribed by the short-period service. Resources left. Under the condition that no ambiguity arises, the embodiments of the present application may use "exclude", "not select", "exclude" and "avoid" without distinction.

In this case, the terminal equipment is likely to select resources that overlap with the reserved resources for side link transmission, which will reduce the reliability of transmission. For pedestrian users in P2X, this will make pedestrian safety unavailable. Assure. This problem will become more serious in NR V2X.

For example, compared to LTE V2X, which only supports two short-period services (only supports 20ms and 50ms), the short-period business types supported by NR V2X are greatly increased (for example, the support period is 1ms to 99ms). By opening the resources reserved for short-period services, NR V2X will not be able to avoid the resources reserved by more short-period services, resulting in more serious resource collisions.

For example, compared to LTE V2X where periodic services dominate, aperiodic services in NR V2X will occupy a larger proportion. In order to avoid resources reserved for aperiodic services, the first time period or the first time period for terminal equipment to perceive The sub-time periods in the time period are likely to be discontinuous in the resource pool, and this discontinuity will lead to the inability to avoid the problem of resources reserved for short-period services.

For another example, NR V2X supports HARQ-ACK-based retransmission. To ensure that PSFCH resources exist between the initial transmission and the retransmission, the second time period may be discontinuous in the resource pool, which will cause the terminal device to sense the first time period Or, the sub-time periods in the first time period are not continuous in the resource pool, and the problem of unavoidable resources reserved for short-period services arises.

In view of at least one of the above technical problems, the embodiments of the present application provide corresponding solutions. The embodiment of the application provides a side link resource selection solution, which can avoid the resources reserved by short-period services in the partial perception of NR V2X, thereby avoiding collisions and the resulting interference, thereby improving the side link The reliability of the transmission achieves the purpose of protecting the personal safety of pedestrians. In the embodiments of the present application, “V2X” or “P2X” is taken as an example to describe the side link, but the present application is not limited to this, and can also be applied to side link scenarios other than “V2X” or “P2X”.

In the following description, without causing confusion, the terms "side link" and "V2X" or "P2X" can be interchanged, the terms "PSFCH" and "side link feedback channel" can be interchanged, and the term " "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 side link transmission (transmission, also referred to as transmission) may be understood as at least one PSSCH/PSCCH transmission or at least one side link data/information transmission.

Embodiments of the first aspect

The embodiment of the present application provides a side link resource selection method, which is explained from a terminal device; for example, the side link resource selection method may be executed by the physical layer of 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. 4 is a schematic diagram of a side link resource selection method according to an embodiment of the present application. As shown in Fig. 4, the method includes:

401. A terminal device receives side link control information in a first time unit within a first time period.

402. The terminal device measures reference signal received power (RSRP) according to the side link control information, and

403. The terminal device determines a resource set in a second time period after the first time period according to the side link control information and the reference signal received power obtained based on the side link control information;

In some embodiments, the first time period may be a listening window, and the second time period is within the resource selection window. The terminal device can perform blind detection (or monitoring) in the first time period, and can receive one or more SCIs. The terminal device can perform RSRP measurement on all or part of the received SCI. For details on how to monitor and measure, you can refer to related technologies.

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 adjusted appropriately, 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.

The above has schematically described the implementation actions of the terminal device, and the following description will be made from the perspective of implementation conditions.

FIG. 5 is another schematic diagram of the side link resource selection method according to an embodiment of the present application. As shown in FIG. 5, the method includes:

501, the terminal device determines resource set (set S _A) of the second period link candidate edge; and

502. The terminal device excludes, from the set of side link candidate resources, candidate resources that meet the following conditions: a set of resources reserved for side link control information received in a first time unit within a first time period, and In the second time period, the periodic or aperiodic resources from the candidate resource overlap; the reference signal received power obtained based on the side link control information is higher than the first threshold; The period for obtaining the side link control information is less than a second threshold; a plurality of second time units after the first time unit are not within the first time period, and the second time unit and the The logical time interval between the first time units is an integer multiple of the logical period obtained based on the period.

It should be noted that Figure 5 above only schematically illustrates an embodiment 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. 5 above.

In some embodiments, the terminal device performs side link transmission in a certain resource pool. A resource pool includes at least one time unit in the time domain and at least one subchannel or at least one RB in the frequency domain. The sub-channels or RBs are numbered from low to high in frequency. One subchannel includes at least one RB in the frequency domain.

In the embodiment of the present application, the time unit included in the resource pool may be referred to as a logical time unit, and the logical time unit may be independently indexed. The description of the embodiments of the present application takes a resource pool as an example, for example, all are limited to a certain resource pool, but the present application is not limited to this.

Fig. 6 is a schematic diagram of a logical time unit according to an embodiment of the present application. As shown in Figure 6, it can be said that the resource pool contains 4 time units, that is, it contains time units with indexes of 0, 1, 3, and 4. It can also be said that the resource pool contains 4 logical time units, that is, it contains indexes of 0 and 1. , 2, and 3 logical time units. If the time interval between time unit 0 and time unit 4 is described, the time interval in units of time units is P=4, and the logical time intervals in units of logical time units are P′=3. Similarly, P in units of any other time unit (such as subframes, time slots, milliseconds, etc.) can be converted into P'in units of logical time units.

In the embodiments of this application,

Represents the time unit index, and y represents the logical time unit index. The terminal equipment uses the time-frequency resources in the resource pool for side link transmission or reception. Continuous in time, continuous in time domain, or continuous in the resource pool refers to continuous in the resource pool, that is, having a continuous logical time unit index. Under the condition that no ambiguity occurs, the embodiments of the present application use the time unit and the logical time unit indiscriminately in some descriptions. The time domain granularity of a candidate resource is a time unit, and the frequency domain granularity is one or more continuous subchannels in the frequency domain.

In some embodiments, the physical layer of the terminal device receives a request from a higher layer (for example, the MAC layer) in time unit n, and determines a resource set to be reported to the higher layer according to the operations shown below.

FIG. 7 is a schematic diagram of partial perception in an embodiment of the present application. As shown in FIG. 7, the method includes:

701. The terminal device determines the second time period in the resource selection window.

For example, the candidate resource R _{x, y} contains a time unit in the time domain

The frequency domain includes L _subCH continuous subchannels in the frequency domain, that is, subchannel x+j (j=0,...,L _subCH -1). The terminal device determines the second time period including Y time units in the resource pool within the time interval [n+T ₁ ,n+T _{2 ].} For a time unit in the second time period, any L _subCH subchannels in the frequency domain of the resource pool that are continuous in the frequency domain correspond to a candidate resource. M _total represents the total number of all candidate resources in the second time period.

702. The terminal device determines a first time period before the second time period in time.

703. The terminal device receives the SCI and performs RSRP measurement within the first time period;

For example, the terminal device monitors the first time period that includes X time units in the resource pool and is located before the second time period in time. The terminal device performs the following operations based on the SCI received during the monitoring process and the measured RSRP.

704. The terminal device determines an RSRP threshold (first threshold).

For example, each measured RSRP corresponds to an RSRP threshold Th(p _t , p _r ). p _t is the priority of the side link transmission to be performed by the terminal device. p _r is the priority of the SCI indication received by the terminal device. (p _t , p _r ) is associated with a threshold Th(p _t , p _r ).

705: The terminal device determines a resource set S. For details, refer to conditions b1-b3 described later.

706. The terminal device determines whether the number of candidate resources in the resource set is less than a threshold.

For example, if the number of candidate resources in the resource set S is less than α·M _total , as shown in 707, all RSRP thresholds in 704 are increased by δdB, and then jump to 705 to continue execution.

In some embodiments, as shown in 708, the physical layer of the terminal device may report the resource set S to a higher layer.

For the resource set S obtained by 705, S does not contain any candidate resource R _x,y that meets the following condition a.

a: by the first time unit

The received SCI (first SCI), or inferred based on the SCI can be in the time unit

The resource set and candidate resources determined by the received SCI (second SCI)

Overlap, and based on the first time unit

The RSRP obtained by the received SCI is higher than the RSRP threshold Th (prio _TX , prio _RX ).

Among them, P _{rsvp_RX} is the first time unit of the terminal equipment

The period indicated by the received SCI, P′ _{rsvp_RX} is the period in logical time unit converted from P _{rsvp_RX} _{; P rsvp_TX} is the period of the side link transmission to be performed by the terminal device, and P′ _{rsvp_TX} is derived from P _{rsvp_TX} The converted period in logical time unit;

C _resel is the number of cycles to be sent by the terminal device, that is, the side link transmission of the terminal device needs to send C _resel cycles; prio _TX is the priority of the side link transmission to be performed by the terminal device; prio _RX is the terminal device in the First time unit

The priority of the received SCI indication; Th(prio _TX , prio _RX ) is the threshold value in 704 associated with _{(prio TX} , prio _RX);

The Q value is determined in the following way:

If P _{rsvp_RX} <T _scal and for any k ∈ {1,2,...,K}, the second time unit

Is not a time unit included in the first time period, or is not within the first time period, then

Q=f(T _scal ,P _{rsvp_RX} ),

otherwise,

Q=1.

Wherein, T _scal represents the cycle threshold (second threshold). For example, when P _{rsvp_RX} <T _scal , it means that _{the service with the cycle P rsvp_RX} is a short-cycle service. The embodiments of the present application do not limit the method of obtaining RSRP based on the first SCI. For example, the RSRP may be an RSRP measured based on the first SCI; for another example, the RSRP may be an RSRP measured based on the second SCI for scheduling retransmission, where the second SCI is located after the first SCI in time, and the second SCI is The SCI and the first SCI schedule two transmissions of the same TB.

In some embodiments, Q=f(T _scal , P _{rsvp_RX} ) means that Q is _{a function of T scal} and P _{rsvp_RX} , and there is no restriction on the specific function form of Q=f(T _scal , P _{rsvp_RX} ). For example, Q can be as Determined in the following way:

or

In some embodiments, there is no restriction on the value of K. For example, the value of K can be determined in the following manner:

K=f(T _scal ,P _{rsvp_RX} ), or K=f(T _scal ,P _{rsvp_RX} )-1

In some embodiments, there is no restriction on the value _{of T scal} _{. For example, the value of T scal} can be determined in the following manner:

T _scal = T ₂ , T _scal = 100 milliseconds, or T _scal = PDB, or T _scal = max(100, PDB), or T _scal is equal to the length of the resource selection window, or T _scal is equal to the length of the second time period. Among them, the packet delay budget PDB (packet delay budget) is in milliseconds, which represents the delay requirements that need to be met for side link transmission.

The units of P _{rsvp_RX} , P _{rsvp_TX} and T _scal may be milliseconds, subframes, time slots, or other time units. For example, f(T _scal ,P _{rsvp_RX} ) can be obtained by calculating g(T′ _scal ,P′ _{rsvp_RX} ), that is, f(T _scal ,P _{rsvp_RX} )=g(T′ _scal ,P′ _{rsvp_RX} ), where the function _{g (T 'scal, P'} rsvp_RX) independent variables are all logical units as a unit of time, _e.g., T _'scal, P' rsvp_RX units of logical time unit.

In some embodiments, the terminal device performs the RSRP measurement after receiving the SCI. The RSRP can be obtained by measuring the demodulation reference signal (DM-RS) of the PSCCH (SCI), or it can be obtained by measuring the DM-RS of the PSSCH scheduled by the SCI. -RS measurement is obtained. There is no restriction on which SCI received by the terminal device performs RSRP measurement. For example, the terminal device may only perform RSRP measurement on the SCI that meets the condition a.

In some embodiments, the α value may be determined in the following manner: for example, α=0.2, α=0.35, or α=0.5. α can be independently configured _{for the priority p t} of side link transmission to be performed by each terminal device.

In some embodiments, the value of δ may be determined in the following manner: for example, δ=3.

In some embodiments, when the terminal device sends aperiodic services, or when there will be no field indicating the period in the SCI sent by the terminal device, it is considered that P _{rsvp_TX} =0, or j=0 in the condition a.

In some embodiments, when there is no field indicating the period in the received SCI, the terminal device determines whether the resource set determined by the SCI overlaps with the candidate resource.

In some embodiments, the resource set determined by a certain SCI may include at least one of the following resources: PSCCH/PSSCH resources indicated by the SCI and located in the same time unit; PSCCH/PSSCH resources indicated by the SCI and located in a different time unit Retransmit resources.

In some embodiments, by the first time unit

The received SCI, or the inferred SCI based on the time unit

The collection of resources determined by the same SCI received can be said to be determined by the first time unit

The received SCI reserved resource collection or reserved resources.

In some embodiments, the use of one or more additional steps between 705 and 706 is not ruled out. For example, a resource set S'is further obtained on the basis of the resource set S obtained by 705, where the number of candidate resources contained in S' Less than or equal to the number of candidate resources contained in S. At this time, 706 becomes a judgment on the number of candidate resources included in the resource set S'.

In some embodiments, for a 501, the terminal determines a resource set S _A, S _A containing the initial period of the second candidate all M _total resource. For 502, may be replaced as follows: once all of the following conditions are met simultaneously, the negative terminal device candidate resource R _{x, y} in the resource set S _A:

b1: The terminal device is in the first time unit

Receiving the first-side link control information, where the first-side link control information indicates the period P _{rsvp_RX} and the priority prio _RX ;

b2: The reference signal received power (RSRP) obtained based on the side link control information is higher than the first threshold Th (prio _TX , prio _RX );

b3: by the first time unit

The received first side link control information, or inferred based on the first side link control information, can be used in the second time unit

The resource set determined by the received second side link control information and the candidate resource

overlapping;

Among them, C _resel is the number of cycles, P′ _{rsvp_RX} is the cycle based on P _{rsvp_RX} in logical time unit; P _{rsvp_TX} is the cycle of side link transmission to be performed, P′ _{rsvp_TX} is based on P _{rsvp_TX} in logical time unit Is the period of the unit; Q is determined in the following way:

If P _{rsvp_RX} <T _scal and for any k ∈ {1,2,...,K}, the second time unit

Q=f(T _scal ,P _{rsvp_RX} ),

Otherwise, Q=1.

In some embodiments, before performing the above 705, the terminal determines a resource set S _A, S _A containing the initial period of the second candidate all M _total resource. After performing the above 705, the determined resource set S containing all the remaining candidate resource set S _A of the resource.

For the "terminal device in a case where the following conditions are excluded candidate resource R _{x, y} in the resource set S _A", which is equivalent to a statement may be "out of the terminal device resource set S _A of the following conditions are met Candidate resources R _x,y ".

The following examples further illustrate the embodiments of the present application. It can be assumed that the first time period is not continuous in the resource pool. Furthermore, suppose that the first time period satisfies the following condition c. Satisfying the condition c means that the following conditions c1 and c2 need to be met at the same time:

c1. There is at least one period P′, so that the logical time unit included in the first time period is not continuous in the third time period. make

Represents the first time unit in the second time period,

Represents the last time unit in the first time period. The period P'is one of the periods available in the resource pool, and is in units of logical time units. A third time period can be determined based on P'. The third time period includes logical time units z, z+1,..., x _e , where z=y _f -f(T _scal ,P)×P′. P is the period corresponding to P′ in absolute time units such as milliseconds, subframes, or time slots;

c2. There is at least one period P′, so that at least one logical time unit exists in the fourth time period, and the logical time unit is not in the first time period. A fourth time period can be determined based on P'. The fourth time period includes logical time units x _e -E, x _e -E+1,...x _e . Where E=P' or E=P'-1.

For the sake of simplicity, the business whose period is less than a certain threshold (P<T _scal or P'<T' _scal ) is called short-period business, and only short-period business is described below; candidates that overlap with resource m will be excluded The resource is referred to as the excluded resource m, or the avoiding resource m; assuming that it is described in a certain resource pool, the time unit and the logical time unit can be used interchangeably; it will be used in the logical time unit without causing confusion. The PSCCH/PSSCH received by m+k×P′ _{rsvp_RX is} referred to as resource m _k for short, and the PSCCH/PSSCH received in the logical time unit m is referred to as resource m for short.

In some embodiments, satisfying condition c means that conditions c1, c2, and c3 need to be satisfied at the same time:

c3, hypothesis

Represents a time unit in the second time period, time unit

Not in the first time period.

Fig. 8 is an example diagram of resource selection in an embodiment of the present application. As shown in FIG. 8, the terminal device blindly detects the SCI in the first time period, and performs resource selection in the second time period according to the received SCI and RSRP measurement results, and determines the resource set S.

The time units included in the second time period can be continuous or discontinuous in the resource pool, and there is no restriction on this. The logical time unit x _e is the last logical time unit of the first time period. The logical time unit y _f is the first logical time unit of the second time period.

The terminal device can obtain the positions of the third time period and the fourth time period according to the period P′ _{rsvp_RX} , so that it can also learn whether the first time period satisfies the condition c. The terminal device can obtain the period P′ _{rsvp_RX} through the received SCI. For the received SCI, if the SCI indicates the period P′ _{rsvp_RX} , it means that the SCI reserves resources periodically.

In some embodiments, one resource pool may support multiple cycles, so the cycles P′ _{rsvp_RX} indicated by different SCIs may be different. Each cycle corresponds to a third time period and a fourth time period. In addition, the terminal device may be configured or pre-configured with a period set, and may also learn the third time period and the fourth time period corresponding to each period in the set based on the period set.

For the traditional LTE V2X partial sensing method, only when the received SCI is within the fourth time period, the resources reserved by the SCI will be excluded. Therefore, for the scenario in FIG. 8, if the LTE method is used, the terminal device cannot exclude the reserved resources m _K-1 and m _K in the second time period.

Using the method of the embodiment of the present application, the terminal device receives the SCI in the logical time unit m, and m ₁ , m ₂ ,..., m _K are not in the first time period, so it can be excluded from being reserved in the second time period The resources m _K-1 , m _K. And it can ensure that the latest RSRP measurement result is always used. As shown in Figure 8, the terminal device will use the RSRP of the resource m instead of the RSRP of the resource m _-1 .

Fig. 9 is an example diagram of resource selection in an embodiment of the present application. The second time period is continuous, the first time period is not continuous, and the first time period satisfies the condition c. It is assumed that the Y time units included in the second time period are continuous in the resource pool. Hypothetical time unit

It is a time unit among Y time units, and the terminal equipment monitors the time unit

Where r∈{1,2,...,R}. The terminal device can only monitor some r values in the set {1,2,...,R}. _{P'step is} in units of logical time units.

In LTE V2X, the situation shown in Figure 9 will not occur. This is because the period of short-period services supported by LTE V2X can only be 20 milliseconds or 50 milliseconds (for example, the fourth time period in Figure 9 corresponds to 20 milliseconds or 50 milliseconds). Milliseconds), LTE V2X performs SCI monitoring in a period of 100 milliseconds (for example, _P'step corresponds to 100 milliseconds in the _{figure), P'step} is always an integer multiple of the fourth time period, so resources can be reserved in the second time period The short-period business will definitely fall into the time unit monitored in the fourth time period.

However, the short-cycle service of NR V2X supports more kinds of cycle values, and _{P'step is} not necessarily an integer multiple of the fourth time period. Therefore, the situation shown in Figure 9 occurs, that is, resource m is reserved in the second time period. The resource m _K is removed, but the resource m does not fall into the time unit monitored in the fourth time period.

If the LTE V2X method is used, since the SCI is not received in the fourth time period, the terminal device cannot exclude the resource m _K reserved by the resource m. Using the method of the embodiment of the present application, the resource reserved by the resource m can be excluded, that is, the terminal device can exclude the resource m _K in the second time period.

Fig. 10 is another example diagram of resource selection in an embodiment of the present application. It further illustrates that short-period services may not fall into the time unit monitored in the fourth time period in NR V2X.

Assume that the Y logical time units included in the second time period are 180-200. Hypothetical time unit

It is a logical time unit among Y logical time units, and the terminal equipment monitors the time unit

Where _P'step =100, r=1, 2,...,R. Therefore, the first time period includes logical time units 80-100, -20-0, and so on. For a short-period service with a period P′ _{rsvp_RX} = 70, the service occupies logical time units -10, 60, 130, and 200. The short-period service does not fall into the time unit monitored in the fourth time period, but resources are still reserved in the second time period.

As a result, the terminal device can exclude some resources reserved for short-period services, and thus can avoid collisions and interference caused by them, thereby improving the reliability of side link transmission.

Fig. 11 is an example diagram of resource selection in an embodiment of the present application. The second time period is not continuous, the first time period is not continuous, and the first time period meets the condition c. It is assumed that the Y time units included in the second time period are not continuous in the resource pool. Hypothetical time unit

If the LTE V2X method is used, since only the resource d is located in the fourth time period and the resource m is not located in the fourth time period, the terminal device cannot exclude the resources m _K-1 and m _K reserved by the resource m. Using the method of the embodiment of the present application, the resources reserved by the resource m and the resource d can be excluded, that is, the terminal device can exclude the resources m _K-1 , m _K , d _K-1 , and d _K in the second time period.

In this way, the terminal device can exclude the resources reserved by the short-period services, and therefore can avoid collisions and the resulting interference, thereby improving the reliability of side link transmission.

Fig. 12 is an example diagram of resource selection in an embodiment of the present application. As shown in FIG. 12, the second time period is continuous, the first time period is not continuous, and the first time period satisfies the condition c. It is assumed that the Y time units included in the second time period are continuous in the resource pool. Hypothetical time unit

Where r∈{1,2,...,R}. Therefore, the sub-time periods W-2, W-3,... Can be determined based on the second time period.

In addition, the sub-time period W-1 is a sub-time period that the terminal device additionally needs to monitor. This is because there are many aperiodic services in NR V2X. For a certain aperiodic service SCI, it reserves resources for sending retransmissions. Assume that the maximum time interval that can be reserved for aperiodic services is the logical time interval from the first logical time unit of the sub-time period W-1 to the first logical time unit of the second time period. The non-periodic services with reserved resources in the time period will all be located in the sub-time period W-1. By increasing the monitoring of the sub-time period W-1, the SCI of the aperiodic service can be received, thereby eliminating the resources reserved by the aperiodic service.

If the LTE V2X method is used, the terminal device either excludes based on the SCI located in the fourth time period or based on the SCI located in the fifth time period. However, the resources reserved by the resource m cannot be excluded based on the fourth time period; the resources reserved by the resource b cannot be excluded based on the fifth time period, and the RSRP of the latest resource d cannot be used. Using the method of the embodiment of the present application, the resources reserved by the resources m, b, and d can be excluded.

As a result, the terminal device can exclude resources reserved for short-period services and aperiodic services, and therefore can avoid collisions and interference caused thereby, thereby improving the reliability of side link transmission.

FIG. 13 is an example diagram of resource selection in an embodiment of the present application. As shown in FIG. 13, the second time period is not continuous, the first time period is not continuous, and the first time period satisfies the condition c. The first time period and the second time period in FIG. 13 are the shaded areas. NR V2X supports HARQ-ACK feedback and HARQ-ACK-based retransmission. In a resource pool, PSFCH resources are periodic. For example, the period of PSFCH in FIG. 13 is two logical time units. PSFCH carries side link ACK/NACK. There needs to be a certain time interval between the PSSCH and the PSFCH, that is, after the terminal device sends the PSSCH, it can receive the feedback ACK/NACK after a certain time interval.

Assuming that the terminal device can receive the PSFCH after two logical time units (that is, logical time unit n+2) at the earliest after sending the PSSCH in logical time unit n, then for the PSSCH sent on logical time units c and c+1, PSFCH will be received in logical time unit c+3. This is because there is no PSFCH in the logical time unit c+2, so the terminal device transmits the PSSCH in the logical time unit c, and it will receive the PSFCH in the logical time unit c+3. If the terminal device needs to perform HARQ-ACK-based retransmission by selecting resources, it must ensure that there is a PSFCH between the initial transmission and the retransmission. For the PSSCH initial transmission sent on the logical time unit c or c+1, the retransmission can only occur in the logical time unit c+4 at the earliest.

Therefore, when determining the second time period, the terminal device should take into account the time sequence restriction caused by PSFCH reception. Therefore, the second time period should select the logical time unit accordingly on the premise that the logical time units c and c+1 are selected. c+4, c+5, and so on, that is, the Y time units included in the second time period are not continuous in the resource pool. Hypothetical time unit

Where r∈{1,2,...,R}. Then the first time period thus determined is also discontinuous, and condition c may be satisfied.

If the LTE V2X method is used, the terminal device cannot exclude the resources m _K-1 and m _K reserved by the resource m. Using the method of the embodiment of the present application, the terminal device can exclude the resources m _K-1 and m _K in the second time period.

The above embodiments only exemplify the embodiments of the present application, but the present application is not limited to this, and appropriate modifications can 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 can exclude certain resources reserved by short-period services or aperiodic services, and therefore can avoid collisions and interference caused by them, thereby improving the reliability of side link transmission.

Embodiments of the second aspect

The embodiments of the present application are supplemented 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.

In some embodiments, a plurality of second time units whose intervals between the first time unit and the first time unit are integer multiples of the period are not located in the first time window where the first time unit is located. The time unit monitored in the subsequent time window.

The first time period includes W sub-time periods, which are sequentially recorded as sub-time period 0, sub-time period 1, ..., sub-time period W-1 in the order of increasing time. Sub-period i X _i comprises logic unit time, 0≤i≤W-1. Different sub-time periods are discontinuous in the resource pool, which refers to discontinuity in the sense of a logical time unit. For example, the logical time unit in the sub-period i and the logical time unit in the sub-period j are not continuous in logical time. The logical time unit in each sub-period is continuous in the resource pool.

x′ _f,i represents the first logical time unit of sub-period i, x′ _e,i represents the last logical time unit of sub-period i, then x′ _f,i = x′ _e,i -X _i +1. Sub-period i corresponds to time window i, x′ _{e, i-} O′ represents the first logical time unit of time window i, and x′ _{e, i} represents the last logical time unit of time window i.

Suppose that the terminal device receives the SCI in the time window i, that is, [x′ _e,i -O′, _x ′ _e,i ], if for a certain j, j∈{i+1,i+2,. ..,W-1}, the resource reserved by the SCI is located in the monitored logical time unit of the terminal device in the time window j, the terminal device will not exclude resources based on this SCI; otherwise, the terminal device Exclude resources based on the SCI.

All monitored logical time units included in time window j can be expressed as logical time units x′ _e,j -min{O′,X _j -1}, x′ _e,j -min{O′,X _j -1 }+1……x′ _e,j . In other words, as long as there is a value of j, which makes the resources (PSCCH/PSSCH) reserved by the SCI received in time window i fall within the logical time unit monitored by time window j, then the terminal device does not Resources will be excluded based on the SCI. Wherein O'=P' _{rsvp_RX} or O'=P' _{rsvp_RX} -1.

For example, the “for any k ∈ {1,2,...,K} in b3 mentioned above, the second time unit

"None of the time units included in the first time period" is called condition d, then condition d can be replaced with the following conditions:

If m satisfies x′ _{e, W-1} -min(O′,X _W-1 -1)≤m≤x′ _e,W-1 (or x′ _e,W-1 -O′≤m≤x′ _e,W-1 ), or

If for a certain i (i=0,1,...,W-2), m satisfies x′ _e,i -min{O′,X _i -1}≤m≤x′ _e,i (or x ′ _E,i -O′≤m≤x′ _e,i ), and m for all j=i+1,i+2,...,W-1 and k=1, 2,...,K None of them satisfy x′ _e,j -min(O′,X _j -1)≤m+k×P′ _{rsvp_RX ≤x} ′ _e,j .

In some embodiments, the logical time unit in each sub-period may also be discontinuous in time. The embodiment of the present application does not limit the method of dividing the sub-time periods.

Fig. 14 is an example diagram of resource selection in an embodiment of the present application. As shown in Figure 14, the terminal device receives an indication in the logical time unit m within the time window W-2 (that is, the time range [x′ _{e, W-2-} O′, x′ _{e, W-2 ])} Short-period SCI, and the resources m ₁ , m ₂ ,..., m _K reserved by the SCI do not fall into any logical time unit monitored by the terminal device within the time window W-1, that is, do not fall into the time interval [x′ _e,W-1 -min{O′,X _W-1 -1},x′ _e,W-1 ], so the terminal device can exclude resources based on this SCI, that is, in the second time period Exclude candidate resources that overlap with m _K-1 and m _K.

Embodiments of the third aspect

In some embodiments, the plurality of second time units whose intervals between the first time unit and the first time unit are integer multiples of the period are not in any one of the sub-time periods located after the first time window.

For example, the “for any k ∈ {1,2,...,K} in b3 mentioned above, the second time order

"None of the time units included in the first time period" is called condition d, then condition d can be replaced with the following conditions.

If m satisfies x′ _{e, W-1} -min(O′,X _W-1 -1)≤m≤x′ _e,W-1 (or x′ _e,W-1 -O′≤m≤x′ _e,W-1 );

Or, if for a certain i (i=0,1,...,W-2), m satisfies x′ _e,i -min{O′,X _i -1}≤m≤x′ _e,i ( Or x′ _e,i -O′≤m≤x′ _e,i ), and m for all j=i+1,i+2,...,W-1 and k=1, 2,... , K does not satisfy x′ _f,j ≤m+k×P′ _{rsvp_RX ≤x} ′ _e,j . Among them, x′ _f,i can also be written as x′ _f,i =x′ _e,i -X _i +1.

In some embodiments, the logical time unit in each sub-period may also be discontinuous in time. The invention does not limit the method of dividing sub-time periods.

Embodiment of the fourth aspect

In the embodiments of the first to third aspects, the action of the terminal device and the conditions of resource selection are taken as examples to illustrate the side link resource selection method of the present application. The embodiments of the first to third aspects may also be used In LTE V2X, at least two discontinuous subframe sets are taken as an example for supplementary explanation, and the same content as the embodiments of the first to third aspects will not be repeated. For LTE V2X, more details and parameter definitions can be found in section 14.1.1.6 of TS 36.213 V15.9.0.

FIG. 15 is another schematic diagram of a method for selecting side link resources according to an embodiment of the present application. As shown in FIG. 15, the method includes:

1501. A terminal device monitors side link control information in a first sub-time period and a second sub-time period of the first time period; and

1502. The terminal device, according to the side link control information received in the first sub-time period and/or the second sub-time period and the RSRP obtained based on the side link control information, obtains the information from the first sub-time period and/or the second sub-time period. Candidate resources corresponding to a time period that overlap with the side link resources reserved by the side link control information are excluded in a second time period after the first time period;

Wherein, a plurality of second time units after the first time unit in which the side link control information is received are not within the first time period, wherein between the second time unit and the first time unit The logical time interval of is an integer multiple of the logical period obtained based on the period indicated by the side link control information.

In some embodiments, as shown in FIG. 15, the method further includes:

1501'. The terminal device determines a set of side link candidate resources in the second time period, where the second time period includes at least a first time unit set and a second time unit set.

In the embodiment of the present application, the first sub-time period and the second sub-time period are located in the first time period (or monitoring window), for example, the two sub-time periods in the first time period as shown in FIG. The time unit set and the second time unit set are located in the second time period (or resource selection window), for example, two time unit sets in the second time period as shown in FIG. 3.

In some embodiments, the first sub-period and the second sub-period are not continuous in the resource pool; the time unit of the second time period is not continuous in the resource pool.

In some embodiments, the first sub-period includes one or more consecutive time units in the resource pool, and the second sub-period includes one or more consecutive time units in the resource pool.

It is worth noting that the above Figure 15 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. 15.

In some embodiments, the terminal device determines whether the side link resource reserved by the side link control information received in the first time window corresponding to the first sub time period is located in the first sub time period The subsequent second sub-time period corresponds to the monitored time unit in the second time window; and the side link resource is not located in the monitored time unit in the second time window, and In the case that the RSRP obtained based on the side link control information is greater than the threshold value, the candidate resources that overlap with the side link resources reserved by the side link control information are excluded from the second time period.

In some embodiments, when the side link resource is within the monitored time unit in the second time window, the terminal device does not exclude the side link from the second time period. Candidate resources where the side link resources reserved by the control information overlap.

In some embodiments, the terminal device receives the side link control information within the second time window, the second time window is the last time window monitored, and the RSRP is greater than the threshold obtained based on the side link control information In the case of the value, the candidate resources that overlap with the side link resources reserved by the side link control information are excluded from the second time period.

In some embodiments, it is assumed that the terminal device _{receives the SCI within the first time window [y′ i} -OP _step ,y′ _i -P _step ], where O=P _step ×P _{rsvp_RX} or O=P _step ×P _{rsvp_RX} -1: If for a certain j, j∈{1,...,N-1-i}, the resource reserved by the SCI is located in the terminal device in the second time window [y ^′ _i+j -OP _Step , y ^′ _i+j -P _step ] is monitored in a certain subframe, the terminal device will not exclude resources based on this SCI; otherwise, the terminal device will exclude resources based on the SCI.

In other words, as long as there is a value of j that enables the terminal device to receive the resource (PSCCH/PSSCH) reserved by the SCI of the first time window in the second time window, then the terminal device will not be based on the SCI Perform resource exclusion.

FIG. 16 is another schematic diagram of a method for selecting side link resources according to an embodiment of the present application. A subframe is taken as an example to illustrate the entire process of selecting side link resources. The present application is not limited to this, for example, time The gap is a unit of time. The steps in FIG. 16 can be executed by the physical layer of the terminal device.

As shown in Figure 16, the method includes:

1601. The terminal device determines and selects Y subframes in the resource selection window [n+T ₁ , n+T _{2 ].} Among them, the candidate resource R _x,y is defined as being located in the subframe

The continuous L _subCH subchannels in the sub-channel (sub-channel) x+j (j=0,...,L _subCH -1); M _total represents the total number of all candidate resources in Y subframes. The Y subframes can be as shown in Figure 2 or 3.

1602. The terminal device monitors the SCI in the first time period; where the first time period includes multiple sub-time periods, as shown in FIG. 2 or 3.

For example, suppose the subframe

It is a subframe of Y subframes. If the k-th bit of the high-level parameter gapCandidateSensing is configured to 1, the device monitors the subframe

This operation 1602 can be performed continuously or multiple times.

1603. The terminal device determines the RSRP threshold parameter Tha _,b .

1604: The terminal device initializes the candidate resource set. Wherein the set S _A is initialized to all the Y sub-frame candidate resource R _{x, y} and set; set S _B is initialized to the empty set.

1605, a terminal equipment excluding any of the following conditions are met for all candidate resources from the set S _A R _{x in, y:}

——The terminal equipment is in the subframe

An SCI is received, and the SCI indicates the reserved period parameter P _{rsvp_RX} and the priority parameter prio _RX .

——The PSSCH/PSCCH RSRP measurement result obtained based on the received SCI is higher than the RSRP threshold

——In subframe

The received SCI, or based on this inference, can be in the subframe

The same SCI received determines a resource set containing RBs and subframes, and this set and candidate resources

Overlap occurs, q=1, 2,...,Q, j=0,1,...,C _resel -1. in:

Assuming that the number of discontinuous subframe sets in the resource pool contained in Y subframes is N, these N subframe sets correspond to numbers from 0 to N-1 in increasing order of time, and the consecutive subframes contained therein The number is expressed as Y ₀ , Y ₁ ,..., Y _{N-1 in turn} , where Y ₀ +Y ₁ +...+Y _N-1 =Y.

If P _{rsvp_RX} <1, and

-If m satisfies y′ _N-1 -P _step -O≤m≤y′ _N-1 -P _step , or

-If for a certain i (i=0,1,...,N-2), m satisfies y′ _i -P _step -O≤m≤y′ _i -P _step and m for all j=1,. ..,N-1-i and k=1, 2,...,K do not satisfy y′ _i+j -P _step -min(O,Y _i+j -1)≤m+k×P _step ×P _{rsvp_RX} ≤y′ _i+j -P _step ;

otherwise,

Q=1.

Among them, O=P _step ×P _{rsvp_RX} or O=P _step ×P _{rsvp_RX} -1;

or

As shown in Figure 16, the method further includes:

1606, the terminal device determines the set S _A number of remaining candidate resource meets the condition, for example, is less than 0.2 · M _total; the number of remaining candidate if the resource set S _A is less than 0.2 · M _total, the Th _a terminal device _,b increases by 3dB, and then executes 1604.

S _A candidate set for a resource R _{x, y,} measure E _{x, y} is defined as a part of the sub frame 1902 and the terminal device is listening subchannel (sub-channel) x + k (k = 0 ,...,L _subCH -1) The linear average of the measured S-RSSI, where the above monitored part of the subframe can be expressed as a non-negative integer j

1607, terminal device metric E _{x, y} smallest candidate resource R _{x, y} set to move from the set S _B S _A. This step may be repeatedly performed until the number of candidate resource set S _{B is} greater than or equal to 0.2 · M _total.

After the physical layer of the terminal apparatus performs complete all the above steps, i.e., S _B contains a set of all candidate resources, the physical layer of the terminal device may report the set S _B to the MAC layer, the MAC layer can be set in the side S _B selected resource Link to send.

It is worth noting that, Fig. 16 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. 16.

Fig. 17 is an example diagram of resource selection in an embodiment of the present application. As shown in Figure 17, the Y subframes selected by the terminal device are not continuous, and can be divided into a group of Y ₀ subframes that are continuous in time and another group of Y ₁ subframes that are continuous in time.

Is the last subframe of _{Y 0 subframes,}

It is the last subframe of _{Y 1 subframes.}

The terminal device receives an SCI indicating a short period in the logical subframe m within the first time window [y′ ₀ -P _step ×P _{rsvp_RX} -P _step , y′ ₀ -P _{step ], and the SCI is reserved} The resources m ₁ , m ₂ ,..., m ₅ do not fall into the second time window [y′ ₁ -P _step ×P _{rsvp_RX} -P _step ,y′ ₁ -P _step [that is monitored by the terminal device For any logical subframe, the terminal device can exclude resources based on this SCI, that is, exclude candidate resources that overlap _{with m 4} and m _{5 in Y subframes.}

Fig. 18 is another example diagram of resource selection in an embodiment of the present application. As shown in Figure 18, the Y subframes selected by the terminal device are not continuous, and can be divided into a group of Y ₀ subframes that are continuous in time and another group of Y ₁ subframes that are continuous in time.

Is the last subframe of _{Y 0 subframes,}

It is the last subframe of _{Y 1 subframes.}

The terminal device receives the first SCI in the logical subframe m within the first time window [y′ ₀ -P _step ×P _{rsvp_RX} -P _step ,y′ ₀ -P _step _{], but the resource m 1 reserved by the SCI} It falls into the logical subframe monitored by the terminal device within the second time window [y′ ₁ -P _step ×P _{rsvp_RX} -P _step , y′ ₁ -P _{step ].}

As shown in FIG. 18, the terminal device monitors the region R ₁ located in the second time window, and therefore can receive the second SCI _{in the subframe m 1.} In this case, the terminal device will exclude resources based on the second SCI, but not based on the first SCI.

In other words, the RSRP measurement results in the above steps are obtained based on the second SCI, that is, obtained by _{measuring the PSSCH/PSCCH at m 1} , so that the latest RSRP results can always be used, and the interference level can be estimated more accurately . By judging the second time window, it is possible to prevent the device from excluding resources based on m in the first time window. In FIG. 18, the terminal device _{performs resource exclusion based on m 1} , and can exclude candidate resources that overlap _{with m 4} , m ₅ , and m _{6 in Y subframes.}

As a result, the terminal equipment can not only exclude some resources reserved by short-period services, and therefore can avoid collisions and the resulting interference, thereby improving the reliability of side link transmission; but also can keep using the latest RSRP results, The degree of interference can be estimated more accurately.

It is worth noting that the above figures 17 and 18 only schematically illustrate 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 FIGS. 17 and 18.

In some embodiments, the above condition further includes: at least one side link resource reserved by the side link control information received within the one time period is not located in one of the subframe sets corresponding to the Within the time period after the one time period.

In some embodiments, the condition for excluding resources reserved for short-period services can also be replaced with the following:

If P _{rsvp_RX} <1, and

-If m satisfies y′ _N-1 -P _step -O≤m≤y′ _N-1 -P _step , or

-If for a certain i (i=0,1,...,N-2), m satisfies y′ _i -P _step -O≤m≤y′ _i -P _step and m for all j=1,. .., N-1-i do not satisfy y′ _i+j -P _step -Y _i+j +1≤m+k×P _step ×P _{rsvp_RX} ≤y′ _i+j -P _step , where k=1 ,2,...,K;

Otherwise, Q=1.

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.

Embodiments of the fifth aspect

The embodiment of the present application provides a side link resource selection device. The apparatus may be, for example, a terminal device, or may be some or some components or components configured in the terminal device, and the same content as the embodiments of the first to fourth aspects will not be repeated.

FIG. 19 is another schematic diagram of the side link resource selection device according to the embodiment of the present application. As shown in FIG. 19, the side link resource selection device 1900 includes:

The receiving unit 1901, which receives the side link control information in the first time unit in the first time period;

The measuring unit 1902, which measures the received power of the reference signal according to the side link control information; and

A selection unit 1903, which determines a resource set in a second time period after the first time period according to the side link control information and the reference signal received power obtained based on the side link control information;

In some embodiments, the first time unit or the second time unit is one of the following subframes, time slots, milliseconds, or a set including at least one time domain symbol.

In some embodiments, the first time period includes at least two sub-time periods that are not continuous in the resource pool; the second time period is continuous in the resource pool.

In some embodiments, the first time period includes at least two sub-time periods that are not continuous in the resource pool; the second time period includes at least two sub-time periods that are not continuous in the resource pool.

In some embodiments, there is at least one logical period, so that the logical time unit included in the first time period is not continuous in the third time period; and there is at least one logical time unit in the fourth time period, and the logic The time unit is not within the first time period.

In some embodiments,

Represents the first time unit in the second time period,

Represents the last time unit in the first time period; P is the period corresponding to the logical period P′; T _scal represents the second threshold value; f(T _scal , P) represents T _scal and P The function;

The third time period and the fourth time period are determined based on P′; the third time period includes logical time units z, z+1,...,x _e , where z=y _f -f( T _scal ,P)×P′; the fourth time period includes logical time units x _e -E, x _e -E+1,...x _e , where E=P′ or E=P′-1.

In some embodiments,

Represents a time unit in the second time period, the time unit

Not within the first time period, P′ represents the logic period.

In some embodiments, the second time unit is not a monitored time unit located in a time window after the first time window in which the first time unit is located.

In some embodiments, the second time unit is not in any sub-time period after the first time window in which the first time unit is located.

In some embodiments, the last time unit of a sub-time period in the first time period is P′ _step logically earlier in the resource pool than the last time unit in the corresponding time unit set in the second time period Time unit; the _P'step is a pre-defined or pre-configured parameter.

In some embodiments, the side link resources reserved by the side link control information include: the first side link control information received in the first time unit, and the first side link control information received by the first side link One or more of the second side link control information and the physical side link inferred from the control information and the period parameter share a channel.

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 side link resource selection apparatus 1900 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. 19 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 various 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 sixth aspect

FIG. 20 is another schematic diagram of the side link resource selection device according to the embodiment of the present application. As shown in FIG. 20, the side link resource selection device 2000 includes:

The monitoring unit 2001, which monitors side link control information in the first sub-time period and the second sub-time period of the first time period; and

The selection unit 2002 is based on the side link control information received in the first sub-time period and/or the second sub-time period and the reference signal received power obtained based on the side link control information, Excluding, from the first time period and the second time period, candidate resources that overlap with the side link resources reserved by the side link control information;

In some embodiments, the first sub-period and the second sub-period are not continuous in the time domain, and the time unit of the second time period is continuous in the resource pool.

In some embodiments, the first sub-period and the second sub-period are not continuous in the time domain; the time unit of the second time period is not continuous in the resource pool.

In some embodiments, as shown in FIG. 20, the side link resource selection apparatus 2000 further includes:

The determining unit 2003, which determines whether at least one side link resource reserved by the side link control information received in the first time window corresponding to the first sub-time period is located after the first sub-time period Within the monitored time unit in the second time window corresponding to the second sub-time period;

In the case that the side link resource is not located in the monitored time unit within the second time window, and the reference signal received power obtained based on the side link control information is greater than a threshold value, the selection The part 2002 excludes candidate resources that overlap with the side link resources reserved by the side link control information from the second time period.

In some embodiments, when the side link resource is located in the monitored time unit in the second time window, the selection unit 2002 does not exclude the side link resource from the second time period. Candidate resources where the side link resources reserved by the side link control information overlap.

In some embodiments, the side link control information is received in the second time window, the second time window is the last time window monitored, and the reference signal obtained based on the side link control information is received In a case where the power is greater than the threshold value, the selection unit 2002 excludes candidate resources that overlap with the side link resources reserved by the side link control information from the second time period.

In some embodiments, the determining unit 2003 is further configured to determine an edge link candidate resource set in the second time period, where the second time period includes at least a first time unit set and a second time unit set.

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 side link resource selection apparatus 2000 may also include other components or modules, and for the specific content of these components or modules, reference may be made to related technologies.

In addition, for the sake of simplicity, FIG. 20 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 aforementioned components or modules can be implemented by hardware facilities such as processors, memories, transmitters, receivers, etc.; the implementation of this application does not limit this.

Embodiments of the seventh aspect

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

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

A terminal device that receives side link control information in a first time unit within a first time period; measures reference signal received power according to the side link control information; and according to the side link control information and based on the side link control information The reference signal received power obtained by the link control information, determining the resource set in the second time period after the first time period;

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. 21 is a schematic diagram of the structure of a network device according to an embodiment of the present application. As shown in FIG. 21, the network device 2100 may include: a processor 2110 (for example, a central processing unit CPU) and a memory 2120; the memory 2120 is coupled to the processor 2110. The memory 2120 can store various data; in addition, it also stores an information processing program 2130, and the program 2130 is executed under the control of the processor 2110.

In addition, as shown in FIG. 21, the network device 2100 may further include: a transceiver 2140, an antenna 2150, etc.; wherein the functions of the above-mentioned components are similar to those in the prior art, and will not be repeated here. It is worth noting that the network device 2100 does not necessarily include all the components shown in FIG. 21; in addition, the network device 2100 may also include components not shown in FIG. 21, and reference may be made to the prior art.

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. 22 is a schematic diagram of a terminal device according to an embodiment of the present application. As shown in FIG. 22, the terminal device 2200 may include a processor 2210 and a memory 2220; the memory 2220 stores data and programs, and is coupled to the processor 2210. 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 2210 may be configured to execute a program to implement the side link resource selection method as described in the embodiments of the first to fourth aspects. For example, the processor 2210 may be configured to perform the following control: receive side link control information in a first time unit within a first time period; measure the reference signal received power according to the side link control information, and perform control according to the side link control information; Link control information and reference signal received power obtained based on the side link control information, determining a resource set in a second time period after the first time period;

Or, for example, the processor 2210 may be configured to perform the following control: monitor side link control information in a first sub-time period and a second sub-time period of the first time period; The side link control information received in the first time period and/or the second sub-time period and the reference signal received power obtained based on the side link control information are excluded from the first time period and the second time period Candidate resources that overlap with the side link resources reserved by the side link control information;

As shown in FIG. 22, the terminal device 2200 may further include: a communication module 2230, an input unit 2240, a display 2250, and a power supply 2260. 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 2200 does not necessarily include all the components shown in FIG. 22, and the above-mentioned components are not necessary; in addition, the terminal device 2200 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 side link resource selection method described in the embodiments of the first to fourth aspects.

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 side link resource selection method described in the embodiments of the first to fourth 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, 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, including:

The terminal device receives the first side link control information at the first time unit in the first time period;

The terminal device measures reference signal received power (RSRP) according to the first side link control information; and

The terminal device determines, according to the first side link control information and the reference signal received power obtained based on the first side link control information, a resource set in a second time period after the first time period ；

Wherein, the resource set does not include candidate resources satisfying the following conditions: the resource set reserved by the first side link control information and the periodic or non-periodical or non-periodical starting from the candidate resource in the second time period. Periodic resources overlap; the reference signal received power obtained based on the first side link control information is higher than a first threshold; the period obtained based on the first side link control information is less than a second threshold; A plurality of second time units after the first time unit are not within the first time period, wherein the logical time interval between the second time unit and the first time unit is obtained based on the period Integer multiples of the logic period.

Supplement 2. A method for selecting side link resources, including:

Determining a set terminal (set S _A) on the side of the second period link candidate resource;

The terminal device excludes, from the set of side link candidate resources, candidate resources that meet the following conditions: the set of resources reserved by the first side link control information received in the first time unit within the first time period is different from the set of resources reserved for the first side link control information received in the first time period Periodic or aperiodic resources starting from the candidate resource in a second time period overlap, wherein the second time period is located after the first time period; obtained based on the first side link control information The reference signal received power is higher than the first threshold value; the period obtained based on the first side link control information is less than the second threshold value; multiple second time units after the first time unit are absent In the first time period, the logical time interval between the second time unit and the first time unit is an integer multiple of the logical period obtained based on the period.

Supplement 3. The method according to

Supplement

1 or 2, the time unit is a subframe, a time slot, a millisecond, or a set including at least one time domain symbol.

Supplement 4. The method according to any one of Supplements 1 to 3, wherein the first time period includes at least two discontinuous sub-time periods in the resource pool, and the second time period is continuous in the resource pool.

Supplement 5. The method according to any one of Supplements 1 to 3, wherein the first time period includes at least two non-contiguous sub-time periods in the resource pool; the second time period includes non-consecutive sub-time periods in the resource pool; At least two consecutive sub-periods.

Supplement 6. The method according to any one of Supplements 1 to 5, wherein there is at least one logic period P′ such that the logical time units included in the first time period are not continuous in the third time period; and So that at least one logical time unit exists in the fourth time period, and the one logical time unit is not in the first time period.

Supplement 7. The method according to Supplement 6, wherein:

Represents the first time unit in the second time period,

Represents the last time unit in the first time period; P is the period corresponding to P′; T _scal represents the second threshold value; f(T _scal , P) represents a function of _{T scal and P} ；

Supplement 8. The method according to Supplement 6 or 7, wherein:

Represents a time unit in the second time period, the time unit

Not within the first time period.

Supplement 9. The method according to Supplement 2, wherein the terminal device excludes candidate resources R _{x, y} from the set of side link candidate resources when at least the following conditions are met:

The terminal device is in the first time unit

Receiving the first side link control information, where the first side link control information indicates a period P _{rsvp_RX} and a priority prio _RX ;

The reference signal received power (RSRP) obtained based on the first side link control information is higher than the first threshold Th (prio _TX , prio _RX ), where prio _TX represents the side link of the terminal device Priority of routing;

According to the first side link control information and/or based on the first side link control information, it can be inferred in the second time unit

The resource set determined by the received second side link control information is the same as the candidate resource

overlapping;

Among them, C _resel is the number of cycles, P′ _{rsvp_RX} is the cycle in logical time unit obtained based on P _{rsvp_RX} _{; P rsvp_TX} is the period of the side link transmission, P′ _{rsvp_TX} is the logical time obtained based on P _{rsvp_TX} The unit is the period of the unit; Q is determined in the following way:

If P _{rsvp_RX} <T _scal and for any k ∈ {1,2,...,K}, the second time unit

Is not a time unit included in the first time period, then Q=f(T _scal ,P _{rsvp_RX} )

Otherwise, Q=1; where f(T _scal , P) represents a function of _{T scal} and P _{rsvp_RX} _{, and T scal} is the second threshold value.

Supplement 10. The method according to Supplement 9, wherein:

K=f(T _scal ,P _{rsvp_RX} ), or K=f(T _scal ,P _{rsvp_RX} )-1.

Supplement 11. The method according to any one of Supplements 1 to 10, wherein the second time unit is not any listener located in a time window after the first time window in which the first time unit is located Time unit.

Appendix 12. The method according to Appendix 11, wherein the resource set does not include candidate resources that meet at least the following conditions:

m satisfies x′ _e,W-1 -min{O′,X _W-1 -1}≤m≤x′ _e,W-1 , or x′ _e,W-1 -O′≤m≤x′ _{e ,W-1} ;

Or, for a certain i (i=0,1,...,W-2), m satisfies x′ _e,i -min{O′,X _i -1}≤m≤x′ _e,i or x ′ _E,i -O′≤m≤x′ _e,i , and m is equal to all j=i+1,i+2,...,W-1 and k=1, 2,...,K Does not satisfy x′ _e,j -min(O′,X _j -1)≤m+k×P′ _{rsvp_RX ≤x} ′ _e,j ;

in,

Represents the first time unit at which the first side link control information is received; the first time period includes

sub-time periods

0, 1...W-1 arranged in increasing order of time; x′ _{e, w} Represents the last logical time unit of the sub-period w, the sub-period w includes X _w logical time units x′ _w,w -X _w +1, x′ _e,w -X _w +2……x′ _e,w , 0≤w≤W-1; the sub-time period w corresponds to a time window w; the time window w includes O′+1 logical time units x′ _{e, w} -O′, x′ _{e, w} -O′+1……x′ _e,w ; the monitored logical time units in the time window w include logical time units x′ _e,w -min(O′,X _w -1), x′ _e,w -min(O',X _w -1)+1...x'_e,w;O'=P' _{rsvp_RX} or O'=P' _{rsvp_RX} -1.

Supplement 13. The method according to any one of Supplements 1 to 10, wherein the second time unit is not in any sub-time period after the first time window in which the first time unit is located.

Appendix 14. The method according to Appendix 13, wherein the resource set does not include candidate resources that meet at least the following conditions:

m satisfies x′ _{e, W-1} -min{O′,X _W-1 -1}≤m≤x′ _{e, W-1} or x′ _{e, W-1} -O′≤m≤x′ _{e, W-1} ;

Or, for a certain i (i=0,1,...,W-2), m satisfies x′ _e,i -min{O′,X _i -1}≤m≤x′ _e,i or x ′ _E,i -O′≤m≤x′ _e,i , and m is equal to all j=i+1,i+2,...,W-1 and k=1, 2,...,K Does not satisfy x′ _e,j -X _j +1≤m+k×P′ _{rsvp_RX ≤x} ′ _e,j ;

in,

sub-time periods

0, 1...W-1 arranged in increasing order of time; x ^′ _{e, w} Represents the last logical time unit of the sub-period w, the sub-period w includes X _w logical time units x′ _{e, w-} X _w +1, x′ _{e, w-} X _w +2...x′ _e,w , 0≤w≤W-1; the sub-time period w corresponds to a time window w; the time window w includes O′+1 logical time units x′ _{e, w-} O′, x′ _{e, w} -O'+1... _x'e _,w ; O'=P' rsvp_RX or O'=P' _{rsvp_RX} -1.

Supplement 15. The method according to any one of Supplements 1 to 14, wherein the last time unit of a sub-time period in the first time period is in the resource pool than the corresponding one in the second time period The last time unit of the time unit set is P′ _step logical time units earlier; the P′ _step is a predefined or pre-configured parameter.

Appendix 16. The method according to Appendix 15, wherein the number of time units in a sub-time period in the first time period and the number of time units in the corresponding time unit set in the second time period The numbers are the same.

Supplement 17. The method according to any one of Supplements 1 to 16, wherein the resource set reserved by the first side link control information includes: the first side link control received in the logical time unit m Information, and/or one or more second side link control information and a physical side link shared channel deduced from the first side link control information and the period.

Supplement 18. A method for selecting side link resources, including:

Supplement 19. The method according to Supplement 18, wherein the first sub-period and the second sub-period are not continuous in the resource pool; the time unit of the second period is in the resource pool continuous.

Supplement 20. The method according to Supplement 18, wherein the first sub-period and the second sub-period are not continuous in the resource pool; the time unit of the second period is in the resource pool Discontinuous.

Appendix 21. The method according to Appendix 18, wherein the first sub-period includes one or more consecutive time units in the resource pool, and the second sub-period includes one or more consecutive time units in the resource pool. Time unit.

Supplement 22. The method according to any one of Supplements 18 to 21, wherein the method further includes:

The terminal device determines whether the side link resource reserved by the side link control information received in the first time window corresponding to the first sub-time period is located in the first sub-time period after the first time window. Within the monitored time unit in the second time window corresponding to the second sub-time period; and

In the case that the side link resource is not located in the monitored time unit within the second time window, and the reference signal received power obtained based on the side link control information is greater than the threshold value, from the In the second time period, candidate resources that overlap with the side link resources reserved by the side link control information are excluded.

Supplement 23. The method according to Supplement 22, wherein the method further includes:

In the case that the side link resource is located in the monitored time unit in the second time window, the side link reserved by the side link control information is not excluded from the second time period Candidate resources with overlapping road resources.

Supplement 24. The method according to Supplement 22, wherein the method further includes:

The side link control information is received in the second time window, the second time window is the last time window monitored, and the reference signal received power obtained based on the side link control information is greater than the threshold value In this case, the candidate resources that overlap with the side link resources reserved by the side link control information are excluded from the second time period.

Supplement 25. The method according to any one of Supplements 22 to 24, wherein:

Represents the first time unit at which the side link control information is received; the first time period includes

sub-time periods

0, 1...W-1 arranged in increasing order of time; x′ _{e, w} represent sub-time periods The last logical time unit of the time period w, the sub-time period w includes X _w logical time units x′ _{e, w-} X _w +1, x′ _{e, w-} X _w +2……x′ _{e, w} , 0≤w≤W-1; the sub-time period w corresponds to a time window w; the time window w includes O′+1 logical time units x′ _{e, w-} O′, x′ _{e, w-} O'+1...x'_e,w;O'=P' _{rsvp_RX} or O'=P' _{rsvp_RX} -1.

Supplement 26. The method according to any one of Supplements 18 to 25, wherein the method further includes:

The terminal device determines an edge link candidate resource set in the second time period, where the second time period includes at least a first time unit set and a second time unit set that are not continuous in the resource pool.

Appendix 27. 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 26 Link resource selection method.

Claims

A device for selecting side link resources includes:

A receiving unit, which receives side link control information in a first time unit within a first time period;

A measuring unit that measures the received power of the reference signal according to the side link control information, and

A selection unit, which determines a resource set in a second time period after the first time period according to the side link control information and the reference signal received power obtained based on the side link control information;

Wherein, the resource set does not include candidate resources meeting the following conditions: the resource set reserved by the side link control information and the periodic or aperiodic starting from the candidate resource in the second time period Resources overlap; the reference signal received power obtained based on the side link control information is higher than the first threshold; the period obtained based on the side link control information is less than the second threshold; A plurality of second time units after a time unit are not within the first time period, wherein the logical time interval between the second time unit and the first time unit is based on the logical period obtained by the period Integer multiples.
The apparatus according to claim 1, wherein the first time unit or the second time unit is one of the following: a subframe, a time slot, a millisecond, or a set including at least one time domain symbol.
The apparatus according to claim 1, wherein the first time period includes at least two sub-time periods that are not continuous in the resource pool; the second time period is continuous in the resource pool.
The apparatus according to claim 1, wherein the first time period includes at least two sub-time periods that are not continuous in the resource pool; the second time period includes at least two sub-time periods that are not continuous in the resource pool.
The device according to claim 1, wherein there is at least one logical period, so that the logical time units included in the first time period are not continuous in the third time period; and there is at least one logical time in the fourth time period Unit, and the one logical time unit is not within the first time period.
The device according to claim 5, wherein:
Represents the first time unit in the second time period,
Represents the last time unit in the first time period; P is the period corresponding to the logical period P′; T scal represents the second threshold value; f(T scal , P) represents T scal and P The function;

The third time period and the fourth time period are determined based on P′; the third time period includes logical time units z, z+1,...,x e , where z=y f -f( T scal ,P)×P′; the fourth time period includes logical time units x e -E, x e -E+1,...x e , where E=P′ or E=P′-1.
The device according to claim 5, wherein:
Represents a time unit in the second time period, the time unit
Not within the first time period, P′ represents the logic period.
The device according to claim 1, wherein the second time unit is not any monitored time unit located in a time window after the first time window in which the first time unit is located.
The apparatus according to claim 1, wherein the second time unit is not in any sub-time period after the first time window in which the first time unit is located.
The apparatus according to claim 1, wherein the last time unit of a sub-time period in the first time period is earlier in the resource pool than the last time unit in the corresponding time unit set in the second time period P'step logical time units; The P'step is a predefined or pre-configured parameter.
The apparatus according to claim 1, wherein the side link resources reserved by the side link control information comprise: the first side link control information received in the first time unit, and the side link control information received by the side link control information One or more of the second-side link control information and the physical side-link shared channel inferred from the first-side link control information and the period parameter.
A device for selecting side link resources includes:

A monitoring unit that monitors side link control information in the first sub-time period and the second sub-time period of the first time period; and

The selection unit, which uses the side link control information received in the first sub-period and/or the second sub-period and the reference signal received power obtained based on the side link control information from Excluding candidate resources that overlap with the side link resources reserved by the side link control information in a second time period after the first time period corresponding to the first time period;

Wherein, a plurality of second time units after the first time unit in which the side link control information is received are not within the first time period, and the difference between the second time unit and the first time unit The logical time interval is an integer multiple of the logical period obtained based on the period indicated by the side link control information.
The apparatus according to claim 12, wherein the first sub-period and the second sub-period are not continuous in the time domain, and the time unit of the second time period is continuous in the resource pool.
The apparatus according to claim 12, wherein the first sub-period and the second sub-period are not continuous in the time domain; the time unit of the second time period is not continuous in the resource pool.
The device according to claim 12, wherein there is at least one cycle, so that the logical time unit included in the first time period is not continuous in the third time period; and there is at least one logical time unit in the fourth time period , And the one logical time unit is not within the first time period.
The device according to claim 12, wherein the device further comprises:

The determining unit determines whether the side link resource reserved by the side link control information received in the first time window corresponding to the first sub-time period is located in the first sub-time period after the first time window. Within the monitored time unit in the second time window corresponding to the second sub-time period;

In the case that the side link resource is not located in the monitored time unit within the second time window, and the reference signal received power obtained based on the side link control information is greater than a threshold value, the selection The part excludes candidate resources that overlap with the side link resources reserved by the side link control information from the second time period.
The apparatus according to claim 16, wherein, in the case that the side link resource is located in the monitored time unit of the second time window, the selection unit does not exclude from the second time period Candidate resources that overlap with the side link resources reserved by the side link control information.
The apparatus according to claim 16, wherein the side link control information is received in the second time window, the second time window is the last time window monitored, and is based on the side link control information In a case where the obtained reference signal received power is greater than the threshold value, the selection unit excludes candidate resources that overlap with the side link resources reserved by the side link control information from the second time period.
The apparatus according to claim 16, wherein the determining unit is further configured to determine a set of side link candidate resources in the second time period, wherein the second time period includes at least a first time unit set and The second time unit collection.
A communication system including:

A terminal device that receives side link control information in a first time unit within a first time period; measures reference signal received power according to the side link control information; and according to the side link control information and based on the side link control information The reference signal received power obtained by the link control information, determining the resource set in the second time period after the first time period;

Wherein, the resource set does not include candidate resources meeting the following conditions: the resource set reserved by the side link control information and the periodic or aperiodic starting from the candidate resource in the second time period Resources overlap; the reference signal received power obtained based on the side link control information is higher than the first threshold; the period obtained based on the side link control information is less than the second threshold; A plurality of second time units after a time unit are not within the first time period, wherein the logical time interval between the second time unit and the first time unit is based on the logical period obtained by the period Integer multiples.