WO2021248421A1 - Procédé et appareil de sélection de ressources de liaison latérale - Google Patents

Procédé et appareil de sélection de ressources de liaison latérale Download PDF

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Publication number
WO2021248421A1
WO2021248421A1 PCT/CN2020/095686 CN2020095686W WO2021248421A1 WO 2021248421 A1 WO2021248421 A1 WO 2021248421A1 CN 2020095686 W CN2020095686 W CN 2020095686W WO 2021248421 A1 WO2021248421 A1 WO 2021248421A1
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Prior art keywords
time
side link
period
time period
control information
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PCT/CN2020/095686
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English (en)
Chinese (zh)
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张健
王昕�
张磊
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富士通株式会社
张健
王昕�
张磊
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Priority to PCT/CN2020/095686 priority Critical patent/WO2021248421A1/fr
Publication of WO2021248421A1 publication Critical patent/WO2021248421A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the embodiments of the present application relate to the field of communication technology.
  • V2X Vehicle to Everything
  • P2X Pedestrian to Everything
  • V2X the sending device can directly communicate with the receiving device through a sidelink.
  • LTE Long Term Evolution
  • NR New Radio
  • 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).
  • PSCCH Physical Sidelink Control Channel
  • PSSCH Physical Sidelink Shared Channel
  • ACK/NACK side link feedback information
  • 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.
  • 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.
  • RSRP Reference Signal received power
  • RSSI Received Signal Strength Indicator
  • the existing technology includes the following solutions: full sensing, partial sensing, and random selection.
  • full sensing the device senses in each subframe or time slot, which can effectively avoid interference, but continuous sensing means continuous power consumption.
  • continuous sensing means continuous power consumption.
  • equipment, equipment power consumption is also an important factor to be considered.
  • 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.
  • 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.
  • 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).
  • HARQ-ACK hybrid automatic repeat request
  • 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.
  • embodiments of the present application provide a method and device for selecting side link resources.
  • a method for selecting side link resources including:
  • the terminal device receives the side link control information at the first time unit in the first time period
  • 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.
  • 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
  • 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;
  • 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.
  • a method for selecting side link resources 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;
  • the first sub-period 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;
  • 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 side link resource selection device including:
  • 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
  • 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;
  • 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 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.
  • 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.
  • 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.
  • 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.
  • LTE Long Term Evolution
  • LTE-A Enhanced Long Term Evolution
  • LTE-A LTE-A
  • LTE-Advanced broadband Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • High-Speed Packet Access High-Speed Packet Access
  • HSPA High-Speed Packet Access
  • 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.
  • 1G generation
  • 2G 2.5G
  • 2.75G 3G
  • 4G 4G
  • 4.5G 3G
  • 5G New Radio
  • NR, New Radio New Radio
  • 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.
  • 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.).
  • NodeB Node B
  • eNodeB or eNB evolved Node B
  • gNB 5G base station
  • RRH Remote Radio Head
  • RRU Remote Radio Unit
  • relay relay
  • low-power node such as femeto, pico, etc.
  • 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.
  • 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.
  • 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.
  • cellular phones Cellular Phone
  • PDAs personal digital assistants
  • wireless modems wireless communication devices
  • handheld devices machine-type communication devices
  • laptop computers Cordless phones
  • smart phones smart watches, digital cameras, etc.
  • a terminal device can also be a machine or device that performs monitoring or measurement.
  • 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.
  • MTC Machine Type Communication
  • D2D Device to Device
  • M2M Machine to Machine
  • network 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.
  • 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.
  • equipment can refer to network equipment or terminal equipment.
  • 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.
  • a communication system 100 may include a network device 101 and terminal devices 102 and 103.
  • 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.
  • the network device 101 and the terminal devices 102 and 103 can perform existing services or future service delivery.
  • 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.
  • 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.
  • side link transmission may be performed between the two terminal devices 102 and 103.
  • 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.
  • 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.
  • the terminal device 102 and/or 103 can independently select the side link resource (ie Mode 2 is used).
  • the side link transmission can be independent of the network device 101, that is, the network device 101 is optional. of.
  • 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.
  • 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.
  • 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.
  • the terms "time-frequency resource” and “resource” can be used interchangeably.
  • the terminal device does not need to perform sensing in every time unit, so it can achieve the purpose of saving power.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • LTE V2X is taken as an example to illustrate the existing problems.
  • TS 36.213 V15.9.0 For more details and stricter definitions, please refer to section 14.1.1.6 of TS 36.213 V15.9.0.
  • the sub-time periods are not continuous in the resource pool.
  • 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.
  • the SCI mentioned in this article are all examples of SCI that indicate a short period.
  • 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].
  • 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.
  • this will make pedestrian safety unavailable. Assure. This problem will become more serious in NR V2X.
  • the short-period business types supported by NR V2X are greatly increased (for example, the support period is 1ms to 99ms).
  • the support period is 1ms to 99ms.
  • aperiodic services in NR V2X will occupy a larger proportion.
  • 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.
  • NR V2X supports HARQ-ACK-based retransmission.
  • the second time period may be discontinuous in the resource pool, which will cause the terminal device to sense the first time period
  • 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.
  • 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.
  • 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”.
  • side link and “V2X” or “P2X” can be interchanged
  • PSFCH and “side link feedback channel”
  • PSCCH and “side link control channel” or “side link control information”
  • PSSCH and "side link data channel” or “side link data” can also be interchanged.
  • 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 may be understood as at least one PSSCH/PSCCH transmission or at least one side link data/information transmission.
  • 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:
  • a terminal device receives side link control information in a first time unit within a first time period.
  • the terminal device measures reference signal received power (RSRP) according to the side link control information, and
  • 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;
  • 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 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.
  • Figure 4 above only schematically illustrates the embodiments of the present application, but the present application is not limited thereto.
  • 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.
  • 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:
  • the terminal device determines resource set (set S A) of the second period link candidate edge
  • 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.
  • Figure 5 above only schematically illustrates an embodiment of the present application, but the present application is not limited thereto.
  • 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.
  • 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.
  • 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.
  • the resource pool contains 4 time units, that is, it contains time units with indexes of 0, 1, 3, and 4.
  • 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.
  • 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
  • the frequency domain granularity is one or more continuous subchannels in the frequency domain.
  • 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.
  • a higher layer for example, the MAC layer
  • FIG. 7 is a schematic diagram of partial perception in an embodiment of the present application. As shown in FIG. 7, the method includes:
  • the terminal device determines the second time period in the resource selection window.
  • the candidate resource R x, y contains a time unit in the time domain
  • 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 ].
  • M total represents the total number of all candidate resources in the second time period.
  • the terminal device determines a first time period before the second time period in time.
  • the terminal device receives the SCI and performs RSRP measurement within the first time period
  • 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.
  • the terminal device determines an RSRP threshold (first threshold).
  • 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 ).
  • the terminal device determines a resource set S. For details, refer to conditions b1-b3 described later.
  • the terminal device determines whether the number of candidate resources in the resource set is less than a threshold.
  • the physical layer of the terminal device may report the resource set S to a higher layer.
  • S does not contain any candidate resource R x,y that meets the following condition a.
  • 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 ).
  • 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
  • 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:
  • the second time unit Is not a time unit included in the first time period, or is not within the first time period, then
  • T scal represents the cycle threshold (second threshold).
  • 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.
  • 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.
  • Q can be as Determined in the following way:
  • the value of K can be determined in the following manner:
  • T scal there is no restriction on the value of T scal .
  • the value of T scal can be determined in the following manner:
  • the packet delay budget PDB packet delay budget
  • PDB packet delay budget
  • the units of P rsvp_RX , P rsvp_TX and T scal may be milliseconds, subframes, time slots, or other time units.
  • 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.
  • DM-RS demodulation reference signal
  • SCI PSCCH
  • -RS measurement is obtained.
  • the terminal device may only perform RSRP measurement on the SCI that meets the condition a.
  • ⁇ can be independently configured for the priority p t of side link transmission to be performed by each terminal device.
  • the terminal device determines whether the resource set determined by the SCI overlaps with the candidate resource.
  • 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.
  • the received SCI, or the inferred SCI based on the time unit can be said to be determined by the first time unit
  • the received SCI reserved resource collection or reserved resources can be said to be determined by the first time unit
  • 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'.
  • the terminal determines a resource set S A, S A containing the initial period of the second candidate all M total resource.
  • S A containing the initial period of the second candidate all M total resource.
  • the terminal 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:
  • 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 ;
  • RSRP reference signal received power
  • 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
  • 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:
  • the second time unit Is not a time unit included in the first time period, or is not within the first time period, then
  • the terminal before performing the above 705, 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.
  • 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:
  • 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'.
  • P is the period corresponding to P′ in absolute time units such as milliseconds, subframes, or time slots;
  • a fourth time period can be determined based on P'.
  • 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.
  • satisfying condition c means that conditions c1, c2, and c3 need to be satisfied at the same time:
  • 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.
  • 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.
  • 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.
  • 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.
  • the terminal device cannot exclude the reserved resources m K-1 and m K in the second time period.
  • 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 can ensure that the latest RSRP measurement result is always used.
  • 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.
  • 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.
  • 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.
  • the terminal device cannot exclude the resource m K reserved by the resource m.
  • 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.
  • the Y logical time units included in the second time period are 180-200.
  • 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 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.
  • the terminal device cannot exclude the resources m K-1 and m K reserved by the resource m.
  • 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.
  • 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.
  • the second time period is continuous, the first time period is not continuous, and the first time period satisfies the condition c.
  • 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 ⁇ . Therefore, the sub-time periods W-2, W-3,... Can be determined based on the second time period.
  • 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.
  • 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.
  • 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.
  • the resources reserved by the resources m, b, and d can be excluded.
  • 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.
  • the second time period is not continuous
  • the first time period is not continuous
  • 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.
  • PSFCH resources are periodic.
  • 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.
  • 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.
  • the terminal device 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 It is a time unit among Y time units, and the terminal equipment monitors the time unit Where r ⁇ 1,2,...,R ⁇ . Then the first time period thus determined is also discontinuous, and condition c may be satisfied.
  • the terminal device cannot exclude the resources m K-1 and m K reserved by the resource m.
  • the terminal device can exclude the resources m K-1 and m K in the second time period.
  • 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.
  • 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.
  • 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.
  • 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 the first logical time unit of sub-period i
  • x′ e,i the last logical time unit of sub-period i
  • 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
  • x′ e, i represents the last logical time unit of time window i.
  • 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 whilx′ e,j .
  • 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.
  • condition d can be replaced with the following conditions:
  • 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.
  • 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.
  • 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.
  • 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.
  • condition d can be replaced with the following conditions.
  • x′ f,i x′ e,i -X i +1.
  • 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.
  • 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.
  • 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.
  • 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:
  • 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;
  • the terminal device 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;
  • 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.
  • the method further includes:
  • 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.
  • 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.
  • 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.
  • 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.
  • the first sub-period includes one or more consecutive time units in the resource pool
  • the second sub-period includes one or more consecutive time units in the resource pool
  • 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.
  • the terminal device 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.
  • 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.
  • 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.
  • the method includes:
  • the terminal device determines and selects Y subframes in the resource selection window [n+T 1 , n+T 2 ].
  • the candidate resource R x,y is defined as being located in the subframe
  • the Y subframes can be as shown in Figure 2 or 3.
  • 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.
  • the device monitors the subframe This operation 1602 can be performed continuously or multiple times.
  • the terminal device determines the RSRP threshold parameter Tha ,b .
  • the terminal device initializes the candidate resource set.
  • 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.
  • 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 .
  • these N subframe sets correspond to numbers from 0 to N-1 in increasing order of time, and the consecutive subframes contained therein
  • the method further includes:
  • 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.
  • 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
  • the physical layer of the terminal apparatus 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.
  • FIG. 16 only schematically illustrates the embodiments of the present application, but the present application is not limited thereto.
  • 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.
  • 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
  • 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.
  • 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. 18 is another example diagram of resource selection in an embodiment of the present application.
  • 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 ].
  • 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.
  • 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 .
  • 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.
  • 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.
  • 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.
  • condition for excluding resources reserved for short-period services can also be replaced with the following:
  • 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.
  • 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
  • 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;
  • 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 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.
  • 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 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.
  • 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 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.
  • 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 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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. 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;
  • 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;
  • 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 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 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 first sub-period includes one or more consecutive time units in the resource pool
  • the second sub-period includes one or more consecutive time units in the resource pool
  • 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;
  • 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.
  • the selection unit 2002 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 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 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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;
  • 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 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;
  • 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 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.
  • 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.
  • 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.
  • FPGA field programmable gate array
  • 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.
  • 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.
  • DSPs digital signal processors
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • 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.
  • 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
  • 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 ;
  • 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.
  • a method for selecting side link resources including:
  • 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.
  • 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;
  • the resource set determined by the received second side link control information is the same as the candidate resource overlapping;
  • 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:
  • 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 ;
  • the first time unit at which the first side link control information is received 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 whilx′ 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 whilx′ 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
  • 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 ;
  • the first time unit at which the first side link control information is received 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′ 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 ;
  • 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.
  • a method for selecting side link resources 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;
  • the first sub-period 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;
  • 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.
  • 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;
  • Supplement 23 The method according to Supplement 22, wherein the method further includes:
  • 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 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.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention concerne un procédé et un appareil de sélection de ressources de liaison latérale. Le procédé comprend : la réception, par un dispositif de terminal, d'informations de commande de liaison latérale durant une première période de temps ; la mesure de la puissance reçue d'un signal de référence selon les informations de commande de liaison latérale ; et selon les informations de commande de liaison latérale reçues durant la première période de temps et la puissance reçue du signal de référence mesurée, la détermination d'un ensemble de ressources durant une seconde période de temps après la première période de temps.
PCT/CN2020/095686 2020-06-11 2020-06-11 Procédé et appareil de sélection de ressources de liaison latérale WO2021248421A1 (fr)

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