WO2023078345A1 - 由用户设备执行的方法以及用户设备 - Google Patents

由用户设备执行的方法以及用户设备 Download PDF

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Publication number
WO2023078345A1
WO2023078345A1 PCT/CN2022/129503 CN2022129503W WO2023078345A1 WO 2023078345 A1 WO2023078345 A1 WO 2023078345A1 CN 2022129503 W CN2022129503 W CN 2022129503W WO 2023078345 A1 WO2023078345 A1 WO 2023078345A1
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Prior art keywords
user equipment
resource
sci
time slot
time
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PCT/CN2022/129503
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English (en)
French (fr)
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赵毅男
罗超
刘仁茂
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夏普株式会社
赵毅男
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management

Definitions

  • the present invention relates to the technical field of wireless communication, and in particular to a method executed by user equipment and corresponding user equipment.
  • D2D communication (Device-to-Device communication, device-to-device direct communication) refers to a direct communication method between two user equipments without being forwarded by a base station or a core network.
  • 3GPP 3rd Generation Partnership Project
  • the upper layer supports unicast (Unicast) and multicast (Groupcast) communication functions.
  • V2X stands for Vehicle to everything. It hopes to realize the interaction between the vehicle and all entity information that may affect the vehicle. The purpose is to reduce accidents, slow down traffic congestion, reduce environmental pollution and provide other information services.
  • V2X application scenarios mainly include four aspects:
  • V2V Vehicle to Vehicle, that is, vehicle-to-vehicle communication
  • V2P Vehicle to Pedestrian, that is, the vehicle sends warnings to pedestrians or non-motorized vehicles
  • V2N Vehicle to Network, that is, the vehicle is connected to the mobile network
  • V2I Vehicle to Infrastructure, that is, communication between vehicles and road infrastructure.
  • V2X stage 1 introduces a new D2D communication interface called PC5 interface.
  • the PC5 interface is mainly used to solve the communication problem of cellular vehicle networking under the environment of high speed (up to 250 km/h) and high node density. Vehicles can exchange information such as position, speed and direction through the PC5 interface, that is, direct communication between vehicles can be performed through the PC5 interface.
  • the functions introduced by LTE Release 14 V2X mainly include:
  • the second phase of the V2X research topic belongs to the research category of LTE Release 15 (see Non-Patent Document 4).
  • the main features introduced include high-order 64QAM modulation, V2X carrier aggregation, short TTI transmission, and feasibility research on transmit diversity.
  • resource allocation mode 2 (resource allocation mode 2) based on user equipment sensing (sensing), or transmission mode 2, is supported.
  • resource allocation mode 2 the physical layer of the user equipment senses the transmission resources in the resource pool, and reports the set of available transmission resources to the upper layer. After the upper layer obtains the report of the physical layer, it performs resource selection or resource re-selection.
  • the enhancement of sidewalk communication includes the following three aspects:
  • Standardize resource allocation methods for reducing power saving of sidelink communication user equipment including but not limited to: resource allocation methods based on partial sensing and resource allocation methods based on random resource selection;
  • Coordination among UEs means: UE A determines a resource set, and sends (indicates) the resource set to UE B.
  • the resource allocation mode of UE B is resource allocation mode 2, and the resource set indicated by UE A is taken into account during resource selection;
  • SL Discontinuous Reception Standardized sideline communication discontinuous reception (SL Discontinuous Reception, SL DRX for short) mechanism.
  • user equipment supports receiving the physical downlink control channel PDCCH discontinuously in time, called DRX, which can effectively reduce the power consumption of communication equipment.
  • discontinuous reception refers to receiving the physical sidelink communication control channel PSCCH in a part of the time domain, and this time is called the active period (Active time); the time when the PSCCH is not received is called Inactive period (In-active time).
  • the coordination message sent by UE A to UE B is an indication of resource collection.
  • the resource set is a resource preferred for UE B transmission (preferred for UE B’s transmission), and/or, a resource not preferred for UE B transmission (non-preferred for UE B’s transmission);
  • the coordination message sent by UE A to UE B indicates that there is an expected (or potential) resource conflict on the resources indicated by the SCI sent by UE B, and /or, indicating that there is a detected resource conflict (resource conflict) on the resource indicated by the SCI sent by UE B.
  • the solution of this patent includes a method for user equipment A to determine a resource set preferred by UE B for transmission in solution one of coordination among UEs.
  • Non-Patent Document 1 RP-140518, Work item proposal on LTE Device to Device Proximity Services
  • Non-Patent Document 2 RP-142311, Work Item Proposal for Enhanced LTE Device to Device Proximity Services
  • Non-Patent Document 3 RP-152293, New WI proposal: Support for V2V services based on LTE sidelink
  • Non-Patent Document 4 RP-170798, New WID on 3GPP V2X Phase 2
  • Non-Patent Document 5 RP-181480, New SID Proposal: Study on NR V2X
  • Non-Patent Document 6 RP-202846, WID revision: NR sidelink enhancement
  • Non-Patent Document 7 RAN1#104bis-e, Chairman’s notes, section 8.11.1.2
  • the present invention provides a method executed by user equipment and the user equipment.
  • the method includes: the first user equipment sends request information to the second user equipment; and the second user equipment determines the resource set preferred by the first user equipment.
  • the request information is a request for coordination messages between user equipments in sidelink communication.
  • the request information at least includes the start time T start of the resource selection window of the first user equipment, and/or, the end time T end of the resource selection window.
  • the moment when the second user equipment triggers the determination of the preferred resource set is time slot n, or, the second user equipment is used to determine the preferred resource set
  • the terminated slot being monitored is
  • the second user equipment The side communication control information SCI is received from above; and the resource reservation period indicated by the resource reservation period indication field in the SCI is P rsvp_RX .
  • the second user equipment determines that in the resource selection window it is assumed to be received and in the time slot The number Q of the same SCI on which the SCI was received.
  • the W represents the time length of the resource selection window. If the time slot n belongs to a time slot in the resource pool, then otherwise, is the first time slot belonging to the resource pool after the time slot n.
  • the second user equipment determines the resource set preferred by the first user equipment at least according to the Q.
  • the user equipment includes: a processor; and a memory storing instructions; wherein the instructions execute the method according to the above first aspect when executed by the processor.
  • the solution of the present invention can enable user equipment A to effectively remove reserved resources indicated by SCIs sent by other user equipments in the resource selection window, reduce resource conflicts, and improve reliability of sidelink communication.
  • Fig. 1 is a schematic diagram showing LTE V2X UE sidelink communication.
  • FIG. 2 is a schematic diagram showing a resource allocation method of LTE V2X.
  • Fig. 3 is a schematic diagram showing the basic process of the method executed by the user equipment in the first embodiment of the invention.
  • FIG. 4 is a block diagram illustrating a user equipment according to an embodiment of the present invention.
  • 3GPP 3rd Generation Partnership Project
  • the third generation partnership project the third generation partnership project
  • LTE Long Term Evolution, long-term evolution technology
  • PDCCH Physical Downlink Control Channel, physical downlink control channel
  • DCI Downlink Control Information, downlink control information
  • PDSCH Physical Downlink Shared Channel, physical downlink shared channel
  • UE User Equipment, user equipment
  • eNB evolved NodeB, evolved base station
  • gNB NR base station
  • TTI Transmission Time Interval, transmission time interval
  • OFDM Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing
  • CP-OFDM Cyclic Prefix Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing with cyclic prefix
  • C-RNTI Cell Radio Network Temporary Identifier, cell radio network temporary identifier
  • CSI Channel State Information, channel state information
  • CSI-RS Channel State Information Reference Signal, channel state information reference signal
  • CRS Cell Reference Signal, cell-specific reference signal
  • PUCCH Physical Uplink Control Channel, physical uplink control channel
  • PUSCH Physical Uplink Shared Channel, physical uplink shared channel
  • UL-SCH Uplink Shared Channel, uplink shared channel
  • SCI Sidelink Control Information, side communication control information
  • PSCCH Physical Sidelink Control Channel, physical sidelink communication control channel
  • MCS Modulation and Coding Scheme
  • RB Resource Block, resource block
  • CRB Common Resource Block, public resource block
  • CP Cyclic Prefix, cyclic prefix
  • PRB Physical Resource Block, physical resource block
  • PSSCH Physical Sidelink Shared Channel, physical sidelink shared channel
  • FDM Frequency Division Multiplexing, Frequency Division Multiplexing
  • RRC Radio Resource Control, radio resource control
  • RSRP Reference Signal Receiving Power, reference signal receiving power
  • SRS Sounding Reference Signal, sounding reference signal
  • DMRS Demodulation Reference Signal, demodulation reference signal
  • CRC Cyclic Redundancy Check, Cyclic Redundancy Check
  • PSDCH Physical Sidelink Discovery Channel, physical sidelink communication discovery channel
  • PSBCH Physical Sidelink Broadcast Channel, physical sidelink broadcast channel
  • TDD Time Division Duplexing, Time Division Duplex
  • FDD Frequency Division Duplexing, Frequency Division Duplex
  • SIB1 System Information Block Type 1, system information block type 1
  • SLSS Sidelink synchronization Signal, side communication synchronization signal
  • PSSS Primary Sidelink Synchronization Signal, primary sidelink synchronization signal
  • SSSS Secondary Sidelink Synchronization Signal, side communication secondary synchronization signal
  • PCI Physical Cell ID, physical cell identification
  • PSS Primary Synchronization Signal, primary synchronization signal
  • SSS Secondary Synchronization Signal, secondary synchronization signal
  • BWP BandWidth Part, bandwidth fragment/part
  • GNSS Global Navigation Satellite System, global navigation satellite positioning system
  • SFN System Frame Number, system (wireless) frame number
  • DFN Direct Frame Number, direct frame number
  • SSB Synchronization Signal Block, Synchronization System Information Block
  • EN-DC EUTRA-NR Dual Connection, LTE-NR Dual Connection
  • MCG Master Cell Group, main cell group
  • SCG Secondary Cell Group, secondary cell group
  • PCell Primary Cell, main cell
  • SCell Secondary Cell, auxiliary cell
  • PSFCH Physical Sidelink Feedback Channel, physical sidelink communication feedback channel
  • SPS Semi-Persistant Scheduling, semi-static scheduling
  • PT-RS Phase-Tracking Reference Signals, phase tracking reference signal
  • CB Code Block, coding block/code block
  • QPSK Quadrature Phase Shift Keying, Quadrature Phase Shift Keying
  • 16/64/256 QAM 16/64/256 Quadrature Amplitude Modulation, quadrature amplitude modulation
  • AGC Auto Gain Control, automatic gain control
  • ARFCN Absolute Radio Frequency Channel Number, Absolute Radio Frequency Channel Number
  • SC-FDMA Single Carrier-Frequency Division Multiple Access, single carrier-frequency division multiple access
  • MAC Medium Access Control, media access control layer
  • V2X in this article can also mean sidelink; similarly, sidelink in this article can also mean V2X, which will not be specifically distinguished and limited in the following text.
  • the resource allocation method of V2X (sidelink) communication and the transmission mode of V2X (sidelink) communication in the description of the present invention can be equivalently replaced.
  • the resource allocation manner mentioned in the specification may represent a transmission mode, and the transmission mode involved may represent a resource allocation manner.
  • transmission mode 1 represents a transmission mode (resource allocation method) based on base station scheduling
  • transmission mode 2 represents a transmission mode (resource allocation method) based on user equipment sensing and resource selection.
  • the PSCCH in the specification of the present invention is used to carry the SCI.
  • the PSCCHs involved in the description of the present invention correspond to, or correspond to, or relate to, or the scheduled PSSCHs have the same meaning, and they all represent associated PSSCH or corresponding PSSCH.
  • the corresponding, or corresponding, or related SCIs (including the first-level SCI and the second-level SCI) of the PSSCH mentioned in the specification have the same meaning, and all indicate associated SCI or corresponding SCI.
  • the first level SCI is called 1st stage SCI or SCI format 1-A, which is transmitted in PSCCH;
  • the second level SCI is called 2nd stage SCI or SCI format 2-A (or, SCI format 2-B) , transmitted in the resources of the corresponding PSSCH.
  • the parameter set numerology includes two meanings of subcarrier spacing and cyclic prefix CP length.
  • Table 4.2-1 shows the supported transmission parameter set, as follows shown.
  • each slot contains 14 OFDM symbols; for an extended CP, each slot contains 12 OFDM symbols.
  • NR and LTE have the same definition for a subframe (subframe), which means 1 ms.
  • subframe For subcarrier spacing configuration ⁇ , the slot number in 1 subframe (1ms) can be expressed as range from 0 to The slot number in a system frame (frame, duration 10ms) can be expressed as range from 0 to in, and The definition of the situation at different subcarrier spacing ⁇ is shown in the table below.
  • Table 4.3.2-1 The number of symbols contained in each slot in normal CP, the number of slots contained in each system frame, and the number of slots contained in each subframe
  • Table 4.3.2-2 The number of symbols contained in each slot when the CP is extended (60kHz), the number of slots contained in each system frame, and the number of slots contained in each subframe
  • the number SFN of the system frame ranges from 0 to 1023.
  • the concept of direct system frame number DFN is introduced in side communication, and the number range is also 0 to 1023.
  • the above description of the relationship between system frame and numerology can also be applied to direct system frame, for example, the duration of a direct system frame Also equal to 10ms, for a subcarrier spacing of 15kHz, a direct system frame includes 10 time slots, and so on. DFN is applied to the timing timing on the sidelink carrier.
  • LTE including LTE V2X parameter set and time slot slot in LTE (including LTE V2X) and subframe subframe
  • LTE only supports subcarrier spacing of 15kHz.
  • Extended (Extended) CP is supported in LTE, and normal CP is also supported.
  • the subframe subframe has a duration of 1 ms and includes two slots, and each slot has a duration of 0.5 ms.
  • each subframe contains 14 OFDM symbols, and each slot in the subframe contains 7 OFDM symbols; for extended CP, each subframe contains 12 OFDM symbols, and each slot in the subframe contains 6 OFDM symbols.
  • a resource block RB is defined in the frequency domain as consecutive subcarriers, for example, for a subcarrier spacing of 15kHz, the RB is 180kHz in the frequency domain.
  • a resource element RE represents one subcarrier in the frequency domain and one OFDM symbol in the time domain.
  • Partial-Coverage sidelink communication one of the UEs performing sidelink communication has no network coverage, and the other UE has network coverage.
  • the UE From the perspective of the UE side, the UE has only two scenarios: no network coverage and network coverage. Partial network coverage is described from the perspective of sidelink communication.
  • Fig. 1 is a schematic diagram showing LTE V2X UE sidelink communication.
  • UE1 sends sidelink communication control information (SCI format 1) to UE2, which is carried by the physical layer channel PSCCH.
  • SCI format 1 includes PSSCH scheduling information, such as PSSCH frequency domain resources.
  • UE1 sends sidelink communication data to UE2, which is carried by the physical layer channel PSSCH.
  • the PSCCH and the corresponding PSSCH adopt frequency division multiplexing, that is, the PSCCH and the corresponding PSSCH are located in the same subframe in the time domain, and are located in different RBs in the frequency domain.
  • a transmission block TB may contain only one initial transmission, or one initial transmission and one blind retransmission (blind retransmission, which means retransmission not based on HARQ feedback).
  • SCI format 1 can be carried in PSCCH, wherein SCI format 1 includes at least frequency domain resource information of PSSCH. For example, for the frequency domain resource indication domain, SCI format 1 indicates the starting sub-channel number and the number of continuous sub-channels of the PSSCH corresponding to the PSCCH.
  • PSSCH occupies one subframe in the time domain, and the corresponding PSCCH adopts frequency division multiplexing (FDM).
  • PSSCH occupies one or more continuous sub-channels in the frequency domain, sub-channels represent n subCHsize consecutive RBs in the frequency domain, n subCHsize is configured by RRC parameters, the number of starting sub-channels and continuous sub-channels Indicated by the frequency domain resource indication field of SCI format 1.
  • Figure 2 shows two resource allocation methods of LTE V2X, which are called resource allocation based on base station scheduling (Transmission Mode 3) and resource allocation based on UE sensing (Transmission Mode 4).
  • transmission mode 3 of LTE V2X corresponds to transmission mode 1 in NR V2X, which is a transmission mode based on base station scheduling
  • transmission mode 4 of LTE V2X corresponds to transmission mode 2 in NR V2X, which is based on UE perception transfer mode.
  • the base station can configure the resource allocation mode of the UE through UE-level dedicated RRC signaling (dedicated RRC signaling) SL-V2X-ConfigDedicated, or called the transmission mode of the UE , Specifically:
  • Resource allocation method based on base station scheduling means that the frequency domain resources used by the sidelink sidelink communication come from the scheduling of the base station.
  • Transmission mode 3 includes two scheduling methods, namely dynamic scheduling and semi-persistent scheduling (SPS).
  • SPS semi-persistent scheduling
  • the UL grant DCI format 5A
  • the CRC of PDCCH or EPDCCH carrying DCI format 5A is scrambled by SL-V-RNTI.
  • the base station configures one or more (up to 8) configured scheduling grants (configured grants) through IE: SPS-ConfigSL-r14, and each configured scheduling grant contains a scheduling grant number (index) and scheduling Licensed resource period.
  • the UL grant (DCI format 5A) includes the frequency domain resources of the PSSCH, and the indication information (3 bits) of the scheduling grant number and the indication information of SPS activation (activate) or release (release, or deactivation).
  • the CRC of PDCCH or EPDCCH carrying DCI format 5A is scrambled by SL-SPS-V-RNTI.
  • the RRC signaling SL-V2X-ConfigDedicated when the RRC signaling SL-V2X-ConfigDedicated is set to scheduled-r14, it means that the UE is configured in a transmission mode based on base station scheduling.
  • the base station configures SL-V-RNTI or SL-SPS-V-RNTI through RRC signaling, and uses PDCCH or EPDCCH (DCI format 5A, CRC uses SL-V-RNTI scrambling or SL-SPS-V-RNTI scrambling ) sending an uplink scheduling grant UL grant to the UE.
  • the above-mentioned uplink scheduling grant UL grant includes at least scheduling information of PSSCH frequency domain resources in sidelink communication.
  • the PSSCH frequency domain resource indication field in the uplink scheduling grant UL grant (DCI format 5A) is used as the PSCCH (SCI format 1) PSSCH frequency domain resource indication information, and send PSCCH (SCI format 1) and the corresponding PSSCH.
  • the UE receives the DCI format 5A scrambled by SL-SPS-V-RNTI on the downlink subframe n. If DCI format 5A contains SPS activation indication information, the UE determines the frequency domain resources of PSSCH according to the indication information in DCI format 5A, and determines the time domain resources of PSSCH (PSSCH transmission subframe) according to subframe n and other information.
  • Resource allocation mode based on UE sensing means that the resources used for sidelink communication are based on the UE's sensing process of the set of candidate available resources.
  • the RRC signaling SL-V2X-ConfigDedicated is set to ue-Selected-r14, it indicates that the UE is configured as a transmission mode based on UE sensing.
  • the base station configures the available transmission resource pool, and the UE determines the sidelink transmission resources of the PSSCH in the transmission resource pool (resource pool) according to certain rules (for a detailed process description, refer to the LTE V2X UE sensing process section) , and send PSCCH (SCI format 1) and corresponding PSSCH.
  • the resources sent and received by the UE belong to the resource pool.
  • the base station schedules transmission resources for sidelink UEs in the resource pool, or, for the transmission mode based on UE perception in sidelink communication, the UE determines transmission resources in the resource pool.
  • the time slots in the sideline communication resource pool are marked as Wherein, T′ max represents the number of time slots belonging to the resource pool within 10240ms (SFN/DFN 0-SFN/DFN 1023).
  • the sidelink communication user equipment selects candidate resources within a time window, and determines the reserved resources according to the reserved resources indicated by the PSCCH sent by other user equipments in the listening time slot. There are overlapping candidate resources, and these overlapping candidate resources are excluded.
  • the physical layer reports the set of candidate resources that are not excluded to the MAC layer, and the MAC layer selects transmission resources for the PSSCH/PSCCH.
  • the set of transmission resources selected by the MAC layer is called a selected sidelink grant.
  • the resource allocation method based on sensing is called resource allocation method 2, which means that the user equipment monitors the PSCCH sent by other sidelink communication user equipment on all time slots except all the time slots transmitted by itself; Sensing) resource allocation method, the user equipment only monitors the PSCCH sent by other user equipment on some time slots in the time domain.
  • the MAC layer of the user equipment randomly selects resources for sidelink communication transmission.
  • the physical layer may provide a resource set for resource selection to the MAC layer.
  • the upper layer requests or triggers the physical layer to determine resources for PSSCH/PSCCH transmission on time slot n (for sensing or partial sensing).
  • the resource selection window is defined as [n+T1, n+T2], that is, the user equipment selects transmission resources within this window.
  • T1 satisfies the condition The selection of T1 depends on the implementation of the user equipment; the RRC configuration information includes a configuration list sl-SelectionWindowList of a resource selection window, wherein, the list corresponds to a given priority prio TX (priority of transmitting PSSCH) element representation It is T 2min .
  • T2 If the T 2min is less than the remaining packet delay budget (remaining packet delay budget, referred to as remaining PDB), then T2 satisfies the condition T 2min ⁇ T2 ⁇ remaining PDB, and the selection of T2 depends on the implementation of the user equipment; otherwise, T2 is set to remaining PDB.
  • the definition of is as follows ( ⁇ SL represents the subcarrier spacing parameter of side communication, that is, the subcarrier spacing is ):
  • T′ max represents the number of time slots belonging to the resource pool within 10240ms (SFN/DFN 0-SFN/DFN 1023).
  • T end ' indicates the time slot in the resource pool Otherwise, T end ' represents the subscript of the first time slot belonging to the resource pool after the time corresponding to T end .
  • n' represents the time slot in the resource pool Otherwise, n' represents the subscript of the first time slot belonging to the resource pool after the time corresponding to n.
  • the present invention does not make any limitation to this. for or or After the time corresponding to the subtraction result is obtained, the above conversion operation is performed on the time. For example, if The corresponding moment belongs to the resource pool, then Represents a time slot in a resource pool otherwise, express The subscript of the first time slot belonging to the resource pool after the corresponding moment.
  • the coordination message sent by UE A to UE B is an indication of resource collection.
  • the resource set is a resource preferred for UE B transmission (preferred for UE B’s transmission), and/or, a resource not preferred for UE B transmission (non-preferred for UE B’s transmission);
  • the coordination message sent by UE A to UE B indicates that there is an expected (or potential) resource conflict on the resource indicated by the SCI sent by UEB, and/ Or, it indicates that there is a detected resource conflict (resource conflict) on the resource indicated by the SCI sent by UE B.
  • both UE A sending the coordination message and UE B receiving the coordination message are referred to as sidelink communication user equipment.
  • Fig. 3 is a schematic diagram showing the basic process of the method executed by the user equipment according to Embodiment 1 of the present invention.
  • the steps performed by the user equipment include:
  • step S101 the first user equipment sends request (request) information to the second user equipment.
  • the request information is a request for a sidelink communication inter-UE coordination message (Inter-UE coordination message).
  • the request information is sent through SCI, or MAC CE, or RRC signaling.
  • the request information includes at least indication information of a resource selection window of the first user equipment; optionally, the indication information includes a start time T start of the resource selection window, and/or, the The end time T end of the resource selection window; or, the second user equipment determines the start time T start of the resource selection window according to the indication information, and/or, the end time T end of the resource selection window .
  • step S102 the second user equipment determines a preferred resource set (preferred resource set) of the first user equipment.
  • the moment when the second user equipment triggers the determination of the preferred resource set is time slot n, or, the termination time slot monitored by the second user equipment for determining the preferred resource set is
  • the second user equipment in the time slot Received side communication control information SCI the second user equipment in the time slot Received side communication control information SCI.
  • the resource reservation period indicated by the resource reservation period indication field in the SCI is P rsvp_RX .
  • the second user equipment determines (in the resource selection window) assuming (will) receive (assume to receive) and in the time slot The number Q of the same SCI on which the SCI was received.
  • the second user equipment determines the resource set preferred by the first user equipment at least according to the Q.
  • the steps performed by the user equipment include:
  • step 1 the first user equipment sends request (request) information to the second user equipment.
  • the request information is a request for a sidelink communication inter-UE coordination message (Inter-UE coordination message).
  • the request information is sent through SCI, or MAC CE, or RRC signaling.
  • the request information includes at least indication information of a resource selection window of the first user equipment; optionally, the indication information includes a start time T start of the resource selection window, and/or, the The end time T end of the resource selection window; or, the second user equipment determines the start time T start of the resource selection window according to the indication information, and/or, the end time T end of the resource selection window .
  • step 2 the second user equipment determines a preferred resource set (preferred resource set) of the first user equipment.
  • the moment when the second user equipment triggers the determination of the preferred resource set is time slot n, or, the termination time slot monitored by the second user equipment for determining the preferred resource set is
  • the second user equipment in the time slot Received side communication control information SCI the second user equipment in the time slot Received side communication control information SCI.
  • the resource reservation period indicated by the resource reservation period indication field in the SCI is P rsvp_RX .
  • the second user equipment determines (in the resource selection window) assuming (will) receive (assume to receive) and in the time slot The number Q of the same SCI on which the SCI was received.
  • the second user equipment determines the resource set preferred by the first user equipment at least according to the Q.
  • FIG. 4 is a block diagram showing a user equipment UE according to the present invention.
  • the user equipment UE80 includes a processor 801 and a memory 802 .
  • the processor 801 may include, for example, a microprocessor, a microcontroller, an embedded processor, and the like.
  • the memory 802 may include, for example, a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a nonvolatile memory (such as a flash memory), or other memories.
  • Memory 802 has program instructions stored thereon. When the instruction is executed by the processor 801, the above method described in detail in the present invention and executed by the user equipment may be executed.
  • the method and related equipment of the present invention have been described above in conjunction with preferred embodiments. Those skilled in the art can understand that the methods shown above are only exemplary, and the embodiments described above can be combined with each other without conflicts.
  • the method of the present invention is not limited to the steps and sequence shown above.
  • the network node and user equipment shown above may include more modules, for example, may also include modules that can be developed or developed in the future and can be used for the base station, MME, or UE, and the like.
  • the various identifiers shown above are only exemplary rather than restrictive, and the present invention is not limited to specific information elements as examples of these identifiers. Numerous variations and modifications may be made by those skilled in the art in light of the teachings of the illustrated embodiments.
  • various components inside the base station and user equipment in the above embodiments can be implemented by various devices, including but not limited to: analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, programmable processing Devices, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), Programmable Logic Devices (CPLDs), etc.
  • DSP digital signal processing
  • ASICs Application Specific Integrated Circuits
  • FPGAs Field Programmable Gate Arrays
  • CPLDs Programmable Logic Devices
  • base station may refer to a mobile communication data and control switching center with relatively large transmission power and wide coverage area, including functions such as resource allocation and scheduling, data reception and transmission.
  • User equipment may refer to a user mobile terminal, such as a mobile phone, a notebook, and other terminal equipment capable of wireless communication with a base station or a micro base station.
  • embodiments of the present invention disclosed herein may be implemented on a computer program product.
  • the computer program product is a product having a computer-readable medium encoded with computer program logic that, when executed on a computing device, provides associated operations to implement Above-mentioned technical scheme of the present invention.
  • the computer program logic When executed on at least one processor of a computing system, the computer program logic causes the processor to execute the operations (methods) described in the embodiments of the present invention.
  • Such arrangements of the invention are typically provided as software, code and/or other data structures arranged or encoded on a computer-readable medium such as an optical medium (e.g., CD-ROM), floppy disk, or hard disk, or as one or more other media of firmware or microcode on a ROM or RAM or PROM chip, or a downloadable software image in one or more modules, a shared database, etc.
  • Software or firmware or such configurations can be installed on the computing device, so that one or more processors in the computing device execute the technical solutions described in the embodiments of the present invention.
  • each functional module or each feature of the base station device and terminal device used in each of the above embodiments may be implemented or executed by a circuit, and the circuit is generally one or more integrated circuits.
  • Circuits designed to perform the various functions described in this specification may include general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs) or general-purpose integrated circuits, field-programmable gate arrays (FPGAs), or other possible Program logic devices, discrete gate or transistor logic, or discrete hardware components, or any combination of the above.
  • a general-purpose processor can be a microprocessor, or the processor can be an existing processor, controller, microcontroller, or state machine.
  • the general-purpose processor or each circuit described above may be configured by a digital circuit, or may be configured by a logic circuit.
  • the present invention can also use an integrated circuit obtained by using the advanced technology.

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Abstract

本发明提供了一种由用户设备执行的方法以及用户设备，所述方法包括：第一用户设备向第二用户设备发送请求信息；以及第二用户设备确定所述第一用户设备偏好的资源集合。

Description

由用户设备执行的方法以及用户设备 技术领域
本发明涉及无线通信技术领域，具体涉及由用户设备执行的方法以及相应的用户设备。
背景技术
在传统的蜂窝网络中，所有的通信都必须经过基站。不同的是，D2D通信(Device-to-Device communication，设备到设备间直接通信)是指两个用户设备之间不经过基站或者核心网的转发而直接进行的通信方式。在2014年3月第三代合作伙伴计划(3rd Generation Partnership Project，3GPP)的RAN#63次全会上，关于利用LTE设备实现临近D2D通信业务的研究课题获得批准(参见非专利文献1)。LTE Release 12 D2D引入的功能包括：
1)LTE网络覆盖场景下临近设备之间的发现功能(Discovery)；
2)临近设备间的直接广播通信(Broadcast)功能；
3)高层支持单播(Unicast)和组播(Groupcast)通信功能。
在2014年12月的3GPP RAN#66全会上，增强的LTE eD2D(enhanced D2D)的研究项目获得批准(参见非专利文献2)。LTE Release 13 eD2D引入的主要功能包括：
1)无网络覆盖场景和部分网络覆盖场景的D2D发现；
2)D2D通信的优先级处理机制。
基于D2D通信机制的设计，在2015年6月3GPP的RAN#68次全会上，批准了基于D2D通信的V2X可行性研究课题。V2X表示Vehicle to everything，希望实现车辆与一切可能影响车辆的实体信息交互，目的是减少事故发生，减缓交通拥堵，降低环境污染以及提供其他信息服务。V2X的应用场景主要包含4个方面：
1)V2V，Vehicle to Vehicle，即车-车通信；
2)V2P，Vehicle to Pedestrian，即车给行人或非机动车发送警告；
3)V2N，Vehicle to Network，即车辆连接移动网络；
4)V2I，Vehicle to Infrastructure，即车辆与道路基础设施等通信。
3GPP将V2X的研究与标准化工作分为3个阶段。第一阶段于2016年9月完成，主要聚焦于V2V，基于LTE Release 12和Release 13 D2D(也可称为sidelink侧行通信)，即邻近通信技术制定(参见非专利文献3)。V2X stage 1引入了一种新的D2D通信接口，称为PC5接口。PC5接口主要用于解决高速(最高250公里/小时)及高节点密度环境下的蜂窝车联网通信问题。车辆可以通过PC5接口进行诸如位置、速度和方向等信息的交互，即车辆间可通过PC5接口进行直接通信。相较于D2D设备间的临近通信，LTE Release 14 V2X引入的功能主要包含：
1)更高密度的DMRS以支持高速场景；
2)引入子信道(sub-channel)，增强资源分配方式；
3)引入具有半静态调度(semi-persistent)的用户设备感知(sensing)机制。
V2X研究课题的第二阶段归属于LTE Release 15研究范畴(参见非专利文献4)，引入的主要特性包含高阶64QAM调制、V2X载波聚合、短TTI传输，同时包含发射分集的可行性研究。
在2018年6月3GPP RAN#80全会上，相应的第三阶段基于5G NR网络技术的V2X可行性研究课题(参见非专利文献5)获得批准。
在5G NR V2X课题中，支持一种基于用户设备感知(sensing)的资源分配方式2(resource allocation mode 2)，或者称为传输模式2。在资源分配方式2中，用户设备的物理层对资源池内的传输资源进行感知，并向上层报告可用的传输资源的集合。上层在获得物理层的报告后，进行资源选择(resource selection)或者资源重选(resource re-selection)。
在2020年12月3GPP RAN#90e全会上，基于已经标准化的NR侧行通信增强(NR sidelink enhancement)的标准化研究课题(参见非专利文献6)获得批准。侧行通信的增强中包含如下三个方面：
1)标准化降低侧行通信用户设备功率消耗(power saving)的资源分配方式，包括但不限于：基于部分感知的资源分配方式 (partial sensing)，基于随机资源选择的资源分配方式；
2)研究提升NR侧行通信中资源分配方式2的通信可靠性以及降低资源分配方式2的通信时延，其中包括：UE之间的协同(Inter-UE coordination)。UE之间协同表示：UE A确定一个资源集合，并且向UE B发送(指示)该资源集合。UE B的资源分配方式为资源分配方式2，并且在资源选择时将UE A指示的该资源集合考虑在内；
3)标准化侧行通信不连续接收(SL Discontinuous Reception，简称SL DRX)机制。在5G NR通信中，用户设备支持在时间上不连续地接收物理下行控制信道PDCCH，称为DRX，可以有效得降低通信设备的功率消耗。相似地，对应于SL DRX，不连续接收指代的是在时域上的部分时间内接收物理侧行通信控制信道PSCCH，该时间称为活跃期(Active time)；不接收PSCCH的时间称为非活跃期(In-active time)。
在2021年4月3GPP RAN1#104bis-e会议中，关于资源分配方式2下的UE之间协同(Inter-UE coordination in mode 2)达成了如下结论(参见非专利文献7)：
Figure PCTCN2022129503-appb-000001
UE之间协同支持如下的两个方案：
○UE之间协同方案一：UE A向UE B发送的协同消息是资源集合的指示。该资源集合是用于UE B传输所偏好的资源(preferred for UE B’s transmission)，和/或，是用于UE B传输所不偏好的资源(non-preferred for UE B’s transmission)；
○UE之间协同方案二：UE A向UE B发送的协同消息是指示UE B发送的SCI所指示的资源上存在预期的(expected)(或者，潜在的potential)资源冲突(resource conflict)，和/或，是指示UE B发送的SCI所指示的资源上存在检测到的(detected)资源冲突(resource conflict)。
本专利的方案包括在UE之间协同的方案一中，用户设备A确定用于UE B传输所偏好的资源集合的一种方法。
现有技术文献
非专利文献
非专利文献1：RP-140518，Work item proposal on LTE Device to Device Proximity Services
非专利文献2：RP-142311，Work Item Proposal for Enhanced LTE Device to Device Proximity Services
非专利文献3：RP-152293，New WI proposal：Support for V2V services based on LTE sidelink
非专利文献4：RP-170798，New WID on 3GPP V2X Phase 2
非专利文献5：RP-181480，New SID Proposal：Study on NR V2X
非专利文献6：RP-202846，WID revision：NR sidelink enhancement
非专利文献7：RAN1#104bis-e，Chairman’s notes，section 8.11.1.2
发明内容
为了解决上述问题中的至少一部分，本发明提供了一种由用户设备执行的方法以及用户设备。
根据本发明的第一方面，包括：第一用户设备向第二用户设备发送请求信息；以及第二用户设备确定所述第一用户设备偏好的资源集合。
根据本发明的第一方面的所述方法，所述请求信息是对于侧行通信用户设备之间协同消息的请求。
根据本发明的第一方面的所述方法，所述请求信息至少包含所述第一用户设备的资源选择窗口的起始时刻T start，和/或，所述资源选择窗口的终止时刻T end。
根据本发明的第一方面的所述方法，所述第二用户设备触发确定所述偏好的资源集合的时刻是时隙n，或者，所述第二用户设备用于确定所述偏好的资源集合所监听的终止时隙是
Figure PCTCN2022129503-appb-000002
根据本发明的第一方面的所述方法，所述第二用户设备在时隙
Figure PCTCN2022129503-appb-000003
上接收到侧行通信控制信息SCI；以及所述SCI中的资源预留周期指示域指示的资源预留周期为P rsvp_RX。
根据本发明的第一方面的所述方法，所述第二用户设备确定在所述资 源选择窗口中假设会接收到的和在所述时隙
Figure PCTCN2022129503-appb-000004
上接收到的所述SCI相同的SCI的数目Q。
根据本发明的第一方面的所述方法，当且仅当在所述SCI中存在所述资源预留周期指示域的情况下，用户设备假设会在时隙
Figure PCTCN2022129503-appb-000005
上接收到和所述SCI相同的SCI。其中，
Figure PCTCN2022129503-appb-000006
T′ max表示在10240ms内(SFN/DFN 0-SFN/DFN 1023)属于资源池的时隙数目；其中，如果P rsvp_RX＜W并且n′-m≤P′ rsvp_RX，那么，
Figure PCTCN2022129503-appb-000007
q＝1，2，...，Q；否则Q＝1，q＝Q。其中，所述W表示所述资源选择窗口的时间长度。如果所述时隙n属于资源池中的时隙，那么
Figure PCTCN2022129503-appb-000008
否则，
Figure PCTCN2022129503-appb-000009
是所述时隙n之后的首个属于资源池的时隙。
根据本发明的第一方面的所述方法，当且仅当在所述SCI中存在所述资源预留周期指示域的情况下，用户设备假设会在时隙
Figure PCTCN2022129503-appb-000010
上接收到和所述SCI相同的SCI。其中，
Figure PCTCN2022129503-appb-000011
T′ max表示在10240ms内(SFN/DFN 0-SFN/DFN 1023)属于资源池的时隙数目；其中，如果n′-m≤P′ rsvp_RX，那么，
Figure PCTCN2022129503-appb-000012
Figure PCTCN2022129503-appb-000013
否则，Q＝1。如果所述时隙n属于资源池中的时隙，那么
Figure PCTCN2022129503-appb-000014
否则，
Figure PCTCN2022129503-appb-000015
是所述时隙n之后的首个属于资源池的时隙。
根据本发明的第一方面的所述方法，所述第二用户设备至少根据所述Q确定所述第一用户设备偏好的资源集合。
本发明的第二方面的用户设备，包括：处理器；以及存储器，存储有指令；其中，所述指令在由所述处理器运行时执行根据上述第一方面的所述方法。
本发明的有益效果
在NR侧行通信增强中，对于用户设备之间的协同，当用户设备B向用户设备A所指示的资源选择窗口的起始时刻和用户设备A确定用户设备B偏好资源集合的时刻之间的时间间隔很大时，本发明的方案可以使得用户设备A有效移除上述资源选择窗口中其他用户设备发送的SCI所指示的预留资源，减少资源冲突，提升侧行通信的可靠性。
附图说明
通过下文结合附图的详细描述，本发明的上述和其它特征将会变得更加明显，其中：
图1是示出了LTE V2X UE侧行通信的示意图。
图2是示出了LTE V2X的资源分配方式的示意图。
图3是示出了发明的实施例一中由用户设备执行的方法的基本过程的示意图。
图4是示出了根据本发明的实施例的用户设备的框图。
具体实施方式
下面结合附图和具体实施方式对本发明进行详细阐述。应当注意，本发明不应局限于下文所述的具体实施方式。另外，为了简便起见，省略了对与本发明没有直接关联的公知技术的详细描述，以防止对本发明的理解造成混淆。
下文以5G移动通信系统及其后续的演进版本作为示例应用环境，具体描述了根据本发明的多个实施方式。然而，需要指出的是，本发明不限于以下实施方式，而是可适用于更多其它的无线通信系统，例如5G之后的通信系统以及5G之前的4G移动通信系统等。
下面描述本发明涉及的部分术语，如未特别说明，本发明涉及的术语采用此处定义。本发明给出的术语在LTE、LTE-Advanced、LTE-Advanced  Pro、NR以及之后的通信系统中可能采用不同的命名方式，但本发明中采用统一的术语，在应用到具体的系统中时，可以替换为相应系统中采用的术语。
3GPP：3rd Generation Partnership Project，第三代合作伙伴计划
LTE：Long Term Evolution，长期演进技术
NR：New Radio，新无线、新空口
PDCCH：Physical Downlink Control Channel，物理下行控制信道
DCI：Downlink Control Information，下行控制信息
PDSCH：Physical Downlink Shared Channel，物理下行共享信道
UE：User Equipment，用户设备
eNB：evolved NodeB，演进型基站
gNB：NR基站
TTI：Transmission Time Interval，传输时间间隔
OFDM：Orthogonal Frequency Division Multiplexing，正交频分复用
CP-OFDM：Cyclic Prefix Orthogonal Frequency Division Multiplexing，带有循环前缀的正交频分复用
C-RNTI：Cell Radio Network Temporary Identifier，小区无线网络临时标识
CSI：Channel State Information，信道状态信息
HARQ：Hybrid Automatic Repeat Request，混合自动重传请求
CSI-RS：Channel State Information Reference Signal，信道状态信息参考信号
CRS：Cell Reference Signal，小区特定参考信号
PUCCH：Physical Uplink Control Channel，物理上行控制信道
PUSCH：Physical Uplink Shared Channel，物理上行共享信道
UL-SCH：Uplink Shared Channel，上行共享信道
CG：Configured Grant，配置调度许可
Sidelink：侧行通信
SCI：Sidelink Control Information，侧行通信控制信息
PSCCH：Physical Sidelink Control Channel，物理侧行通信控制信道
MCS：Modulation and Coding Scheme，调制编码方案
RB：Resource Block，资源块
RE：Resource Element，资源单元
CRB：Common Resource Block，公共资源块
CP：Cyclic Prefix，循环前缀
PRB：Physical Resource Block，物理资源块
PSSCH：Physical Sidelink Shared Channel，物理侧行通信共享信道
FDM：Frequency Division Multiplexing，频分复用
RRC：Radio Resource Control，无线资源控制
RSRP：Reference Signal Receiving Power，参考信号接收功率
SRS：Sounding Reference Signal，探测参考信号
DMRS：Demodulation Reference Signal，解调参考信号
CRC：Cyclic Redundancy Check，循环冗余校验
PSDCH：Physical Sidelink Discovery Channel，物理侧行通信发现信道
PSBCH：Physical Sidelink Broadcast Channel，物理侧行通信广播信道
SFI：Slot Format Indication，时隙格式指示
TDD：Time Division Duplexing，时分双工
FDD：Frequency Division Duplexing，频分双工
SIB1：System Information Block Type 1，系统信息块类型1
SLSS：Sidelink synchronization Signal，侧行通信同步信号
PSSS：Primary Sidelink Synchronization Signal，侧行通信主同步信号
SSSS：Secondary Sidelink Synchronization Signal，侧行通信辅同步信号
PCI：Physical Cell ID，物理小区标识
PSS：Primary Synchronization Signal，主同步信号
SSS：Secondary Synchronization Signal，辅同步信号
BWP：BandWidth Part，带宽片段/部分
GNSS：Global Navigation Satellite System，全球导航卫星定位系统
SFN：System Frame Number，系统(无线)帧号
DFN：Direct Frame Number，直接帧号
IE：Information Element，信息元素
SSB：Synchronization Signal Block，同步系统信息块
EN-DC：EUTRA-NR Dual Connection，LTE-NR双连接
MCG：Master Cell Group，主小区组
SCG：Secondary Cell Group，辅小区组
PCell：Primary Cell，主小区
SCell：Secondary Cell，辅小区
PSFCH：Physical Sidelink Feedback Channel，物理侧行通信反馈信道
SPS：Semi-Persistant Scheduling，半静态调度
TA：Timing Advance，上行定时提前量
PT-RS：Phase-Tracking Reference Signals，相位跟踪参考信号
TB：Transport Block，传输块
CB：Code Block，编码块/码块
QPSK：Quadrature Phase Shift Keying，正交相移键控
16/64/256 QAM：16/64/256 Quadrature Amplitude Modulation，正交幅度调制
AGC：Auto Gain Control，自动增益控制
TDRA(field)：Time Domain Resource Assignment，时域资源分配指示(域)
FDRA(field)：Frequency Domain Resource Assignment，频域资源分配指示(域)
ARFCN：Absolute Radio Frequency Channel Number，绝对无线频率信道编号
SC-FDMA：Single Carrier-Frequency Division Multiple Access，单载波-频分复用多址
MAC：Medium Access Control，媒体接入控制层
DRX：Discontinuous Reception，不连续接收
下文是与本发明方案相关联现有技术的描述。如无特别说明，具体实 施例中与现有技术中相同术语的含义相同。
值得指出的是，本发明说明书中涉及的V2X与sidelink含义相同。文中的V2X也可以表示sidelink；相似地，文中的sidelink也可以表示V2X，后文中不做具体区分和限定。
本发明的说明书中的V2X(sidelink)通信的资源分配方式与V2X(sidelink)通信的传输模式可以等同替换。说明书中涉及的资源分配方式可以表示传输模式，以及，涉及的传输模式可以表示资源分配方式。在NR侧行通信中，传输模式1表示基于基站调度的传输模式(资源分配方式)；传输模式2表示基于用户设备感知(sensing)和资源选择的传输模式(资源分配方式)。
本发明的说明书中的PSCCH用于携带SCI。本发明的说明书中涉及到的PSCCH对应的，或者，相应的，或者，相关的，或者，调度的PSSCH表示的含义均相同，都表示associated PSSCH或者corresponding PSSCH。类似地，说明书中涉及到的PSSCH对应的，或者，相应的，或者，相关的SCI(包括第一级SCI和第二级SCI)表示的含义均相同，都表示associated SCI或者corresponding SCI。值得指出的是，第一级SCI称为1st stage SCI或者SCI format 1-A，在PSCCH中传输；第二级SCI称为2nd stage SCI或者SCI format 2-A(或者，SCI format 2-B)，在对应的PSSCH的资源中传输。
在本发明的说明书中，
Figure PCTCN2022129503-appb-000016
表示对a做上取整运算，即不小于a的最小整数，例如
Figure PCTCN2022129503-appb-000017
同样地，
Figure PCTCN2022129503-appb-000018
表示对a做下取整运算，即不大于a的最大整数，例如
Figure PCTCN2022129503-appb-000019
值得指出的是，在本发明的实施例中，上取整运算符和下取整运算符之间可以相互替换，例如
Figure PCTCN2022129503-appb-000020
可以用
Figure PCTCN2022129503-appb-000021
替代，本发明对此不做任何限制。
在本发明说明书的实施例中，括号中的内容均为可选项。
NR中(包含NR sidelink)的参数集合(numerology)和NR中(包含NR  sidelink)的时隙slot
参数集合numerology包含子载波间隔和循环前缀CP长度两方面含义。其中，NR支持5种子载波间隔，分别为15k，30k，60k，120k，240kHz(对应μ＝0，1，2，3，4)，表格4.2-1示出了支持的传输参数集合，具体如下所示。
表4.2-1 NR支持的子载波间隔
μ Δf＝2 μ·15[kHz] CP(循环前缀)
0 15 正常
1 30 正常
2 60 正常，扩展
3 120 正常
4 240 正常
仅当μ＝2时，即60kHz子载波间隔的情况下支持扩展(Extended)CP，其他子载波间隔的情况仅支持正常CP。对于正常(Normal)CP，每个时隙(slot)含有14个OFDM符号；对于扩展CP，每个时隙含有12个OFDM符号。对于μ＝0，即15kHz子载波间隔，1个时隙＝1ms；μ＝1，即30kHz子载波间隔，1个时隙＝0.5ms；μ＝2，即60kHz子载波间隔，1个时隙＝0.25ms，以此类推。
NR和LTE对于子帧(subframe)的定义相同，表示1ms。对于子载波间隔配置μ，1个子帧内(1ms)的slot编号可以表示为
Figure PCTCN2022129503-appb-000022
范围为0到
Figure PCTCN2022129503-appb-000023
1个系统帧(frame，时长10ms)内的slot编号可以表示为
Figure PCTCN2022129503-appb-000024
范围为0到
Figure PCTCN2022129503-appb-000025
其中，
Figure PCTCN2022129503-appb-000026
和
Figure PCTCN2022129503-appb-000027
在不同子载波间隔μ的情况的定义如下表格所示。
表格4.3.2-1：正常CP时每个slot包含的符号数，每个系统帧包含的slot数，每个子帧包含的slot数
Figure PCTCN2022129503-appb-000028
表格4.3.2-2：扩展CP时(60kHz)每个slot包含的符号数，每个系统帧包含的slot数，每个子帧包含的slot数
Figure PCTCN2022129503-appb-000029
在NR载波上，系统帧(或者，简称为帧)的编号SFN范围为0至1023。在侧行通信中引入了直接系统帧号DFN的概念，编号范围同样为0至1023，上述对于系统帧和numerology之间关系的叙述同样可以应用于直接系统帧，例如，一个直接系统帧的时长同样等于10ms，对于15kHz的子载波间隔，一个直接系统帧包括10个时隙slot，等等。DFN应用于sidelink载波上的定时timing。
LTE中(包含LTE V2X)参数集和LTE中(包含LTE V2X)的时隙slot 和子帧subframe
LTE仅支持15kHz的子载波间隔。LTE中支持扩展(Extended)CP，也支持正常CP。子帧subframe时长为1ms，包含两个时隙slot，每个slot时长为0.5ms。
对于正常(Normal)CP，每个子帧含有14个OFDM符号，子帧中的每个slot包含7个OFDM符号；对于扩展CP，每个子帧含有12个OFDM符号，子帧中的每个slot包含6个OFDM符号。
资源块RB和资源单元RE
资源块RB在频域上定义为
Figure PCTCN2022129503-appb-000030
个连续的子载波，例如对于15kHz的子载波间隔，RB在频域上为180kHz。对于子载波间隔15kHz×2 μ，资源单元RE在频域上表示1个子载波，在时域上表示1个OFDM符号。
Sidelink通信的场景
1)无网络覆盖(Out-of-Coverage)侧行通信：进行sidelink通信的两 个UE都没有网络覆盖(例如，UE在需要进行sidelink通信的频率上检测不到任何满足“小区选择准则”的小区，表示该UE无网络覆盖)。
2)有网络覆盖(In-Coverage)侧行通信：进行sidelink通信的两个UE都有网络覆盖(例如，UE在需要进行sidelink通信的频率上至少检测到一个满足“小区选择准则”的小区，表示该UE有网络覆盖)。
3)部分网络覆盖(Partial-Coverage)侧行通信：进行sidelink通信的其中一个UE无网络覆盖，另一个UE有网络覆盖。
从UE侧来讲，该UE仅有无网络覆盖和有网络覆盖两种场景。部分网络覆盖是从sidelink通信的角度来描述的。
LTE V2X(sidelink)通信的基本过程
图1是示出了LTE V2X UE侧行通信的示意图。首先，UE1向UE2发送侧行通信控制信息(SCI format 1)，由物理层信道PSCCH携带。SCI format 1包含PSSCH的调度信息，例如PSSCH的频域资源等。其次，UE1向UE2发送侧行通信数据，由物理层信道PSSCH携带。PSCCH和相应的PSSCH采用频分复用的方式，即PSCCH和相应的PSSCH在时域上位于相同的子帧上，在频域上位于不同的RB上。在LTE V2X中，一个传输块TB可能仅包含一次初始传输，或者包含一次初始传输和一次盲重传(blind retransmission，表示不基于HARQ反馈的重传)。
PSCCH和PSSCH的具体设计方式如下：
1)PSCCH在时域上占据一个子帧，频域上占据两个连续的RB。加扰序列的初始化采用预定义数值510。PSCCH中可携带SCI format 1，其中SCI format 1至少包含PSSCH的频域资源信息。例如，对于频域资源指示域，SCI format 1指示该PSCCH对应的PSSCH的起始sub-channel编号和连续sub-channel的数目。
2)PSSCH在时域上占据一个子帧，和对应的PSCCH采用频分复用(FDM)。PSSCH在频域上占据一个或者多个连续的sub-channel， sub-channel在频域上表示n subCHsize个连续的RB，n subCHsize由RRC参数配置，起始sub-channel和连续sub-channel的数目由SCI format 1的频域资源指示域指示。
LTE V2X的资源分配方式Transmission Mode 3/4
图2是示出了LTE V2X的两种资源分配方式，分别称为基于基站调度的资源分配(Transmission Mode 3)和基于UE感知(sensing)的资源分配(Transmission Mode 4)。在NR侧行通信中，LTE V2X的传输模式3对应NR V2X中的传输模式1，为基于基站调度的传输模式；LTE V2X的传输模式4对应NR V2X中的传输模式2，为基于UE感知的传输模式。LTE V2X中，当存在eNB网络覆盖的情况下，基站可通过UE级的专有RRC信令(dedicated RRC signaling)SL-V2X-ConfigDedicated配置该UE的资源分配方式，或称为该UE的传输模式，具体为：
1)基于基站调度的资源分配方式(Transmission Mode 3)：基于基站调度的资源分配方式表示sidelink侧行通信所使用的频域资源来自于基站的调度。传输模式3包含两种调度方式，分别为动态调度和半静态调度(SPS)。对于动态调度，UL grant(DCI format 5A)中包括PSSCH的频域资源，承载DCI format 5A的PDCCH或者EPDCCH的CRC由SL-V-RNTI加扰。对于SPS半静态调度，基站通过IE：SPS-ConfigSL-r14配置一个或者多个(至多8个)配置的调度许可(configured grant)，每个配置的调度许可含有一个调度许可编号(index)和调度许可的资源周期。UL grant(DCI format 5A)中包括PSSCH的频域资源，以及，调度许可编号的指示信息(3bits)和SPS激活(activate)或者释放(release，或者，去激活)的指示信息。承载DCI format 5A的PDCCH或者EPDCCH的CRC由SL-SPS-V-RNTI加扰。
具体地，当RRC信令SL-V2X-ConfigDedicated置为scheduled-r14时，表示该UE被配置为基于基站调度的传输模式。基站通过RRC信令配置SL-V-RNTI或者SL-SPS-V-RNTI，并通过PDCCH或者 EPDCCH(DCI format 5A，CRC采用SL-V-RNTI加扰或者采用SL-SPS-V-RNTI加扰)向UE发送上行调度许可UL grant。上述上行调度许可UL grant中至少包含sidelink通信中PSSCH频域资源的调度信息。当UE成功监听到由SL-V-RNTI加扰或者SL-SPS-V-RNTI加扰的PDCCH或者EPDCCH后，将上行调度许可UL grant(DCI format 5A)中的PSSCH频域资源指示域作为PSCCH(SCI format 1)中PSSCH的频域资源的指示信息，并发送PSCCH(SCI format 1)和相应的PSSCH。
对于传输模式3中的半静态调度SPS，UE在下行子帧n上接收SL-SPS-V-RNTI加扰的DCI format 5A。如果DCI format 5A中包含SPS激活的指示信息，该UE根据DCI format 5A中的指示信息确定PSSCH的频域资源，根据子帧n等信息确定PSSCH的时域资源(PSSCH的发送子帧)。
2)基于UE感知(sensing)的资源分配方式(Transmission Mode 4)：基于UE sensing的资源分配方式表示用于sidelink通信的资源基于UE对候选可用资源集合的感知(sensing)过程。RRC信令SL-V2X-ConfigDedicated置为ue-Selected-r14时表示该UE被配置为基于UE sensing的传输模式。在基于UE sensing的传输模式中，基站配置可用的传输资源池，UE根据一定的规则(详细过程的描述参见LTE V2X UE sensing过程部分)在传输资源池(resource pool)中确定PSSCH的sidelink发送资源，并发送PSCCH(SCI format 1)和相应的PSSCH。
侧行通信资源池(sidelink resource pool)
在侧行通信中，UE的发送和接收的资源均属于资源池resource pool。例如，对于侧行通信中基于基站调度的传输模式，基站在资源池中为sidelink UE调度传输资源，或者，对于侧行通信中基于UE感知的传输模式，UE在资源池中确定传输资源。在本专利的说明书中，侧行通信资源池中的时隙标记为
Figure PCTCN2022129503-appb-000031
其中，T′ max表示在10240ms 内(SFN/DFN 0-SFN/DFN 1023)属于资源池的时隙数目。
基于(部分)感知的资源分配方式
对于基于(部分)感知的资源分配方式，侧行通信用户设备在一个时间窗口内选择候选资源，并根据监听时隙中其他用户设备发送的PSCCH所指示的预留资源，确定和该预留资源有重叠的候选资源，并将这些有重叠的候选资源排除(exclude)。物理层将未被排除的候选资源集合上报至MAC层，MAC层为PSSCH/PSCCH选择传输资源。MAC层选择的传输资源的集合称为选择的侧行通信调度许可(selected sidelink grant)。
基于感知(sensing)的资源分配方式称为资源分配方式2，表示用户设备在除去所有自身发送的时隙以外的全部时隙上监听其他侧行通信用户设备发送的PSCCH；对于基于部分感知(partial sensing)的资源分配方式，用户设备在时域上仅监听部分时隙上其他用户设备发送的PSCCH。
基于随机资源选择的资源分配方式
对于基于随机资源选择的资源分配方式，表示用户设备的MAC层随机地选择用于侧行通信传输的资源。其中，物理层可以向MAC层提供用于资源选择的一个资源集合。
资源选择窗口[n+T1，n+T2]
在基于感知(或者，部分感知)的资源分配方式中，高层在时隙n上请求或者触发物理层确定用于PSSCH/PSCCH传输的资源(进行感知或者部分感知)。资源选择窗口定义为[n+T1，n+T2]，即用户设备在该窗口内选择传输资源。其中，T1满足条件
Figure PCTCN2022129503-appb-000032
T1的选择取决于用户设备的实现；RRC配置信息中包含一个资源选择窗口的配置列表sl-SelectionWindowList，其中，该列表中对应一个给定的优先级prio TX(传输PSSCH的优先级)的元素表示为T 2min。如果该T 2min小于剩余数据包 延迟预算(remaining packet delay budget，简称为remaining PDB)，那么，T2满足条件T 2min≤T2≤remaining PDB，T2的选择取决于用户设备的实现；否则T2设置为remaining PDB。
Figure PCTCN2022129503-appb-000033
的定义如下(μ SL表示侧行通信的子载波间隔参数，即子载波间隔为
Figure PCTCN2022129503-appb-000034
)：
Table 8.1.4-2：
Figure PCTCN2022129503-appb-000035
的取值
Figure PCTCN2022129503-appb-000036
Table 8.1.4-1：
Figure PCTCN2022129503-appb-000037
的取值
Figure PCTCN2022129503-appb-000038
用户设备确定资源池时隙数目的方法
对于单位为毫秒(或者，物理时间，若干个时隙)的时间长度P rsvp，转化为资源池中时隙数目P rsvp′的方法如下：
Figure PCTCN2022129503-appb-000039
其中，T′ max表示在10240ms内(SFN/DFN 0-SFN/DFN 1023)属于资源池的时隙数目。
值得指出的是，在本发明的实施例中，对于例如
Figure PCTCN2022129503-appb-000040
的计算，也可以表示为
Figure PCTCN2022129503-appb-000041
其中，如果T end对应的时刻属于资源池，那么T end′表示资源池中的时隙
Figure PCTCN2022129503-appb-000042
否则，T end′表示T end对应的时刻之后首个属于 资源池的时隙的下标。同样地，如果n对应的时刻属于资源池，那么n′表示资源池中的时隙
Figure PCTCN2022129503-appb-000043
否则，n′表示n对应的时刻之后首个属于资源池的时隙的下标。本发明对此不做任何限制。对于
Figure PCTCN2022129503-appb-000044
或者
Figure PCTCN2022129503-appb-000045
或者
Figure PCTCN2022129503-appb-000046
在得到减法结果对应的时刻后，再对该时刻进行上述转换运算。例如，如果
Figure PCTCN2022129503-appb-000047
对应的时刻属于资源池，那么
Figure PCTCN2022129503-appb-000048
表示资源池中的时隙
Figure PCTCN2022129503-appb-000049
否则，
Figure PCTCN2022129503-appb-000050
表示
Figure PCTCN2022129503-appb-000051
对应的时刻之后首个属于资源池的时隙的下标。
UE之间协同(Inter-UE coordination)
UE之间协同支持如下的两个方案：
○UE之间协同方案一：UE A向UE B发送的协同消息是资源集合的指示。该资源集合是用于UE B传输所偏好的资源(preferred for UE B’s transmission)，和/或，是用于UE B传输所不偏好的资源(non-preferred for UE B’s transmission)；
○UE之间协同方案二：UE A向UE B发送的协同消息是指示UEB发送的SCI所指示的资源上存在预期的(expected)(或者，潜在的potential)资源冲突(resource conflict)，和/或，是指示UE B发送的SCI所指示的资源上存在检测到的(detected)资源冲突(resource conflict)。
在本发明的说明书中，发送协同消息的UE A和接收协同消息的UE B均称为侧行通信用户设备。
以下，对本发明所涉及的具体的示例以及实施例等进行详细说明。另外，如上所述，本公开中记载的示例以及实施例等是为了容易理解本发明 而进行的示例性说明，并不是对本发明的限定。
[实施例一]
图3是示出了本发明的实施例一的由用户设备执行的方法的基本过程的示意图。
下面，结合图3所示的基本过程图来详细说明本发明的实施例一的由用户设备执行的方法。
如图3所示，在本发明的实施例一中，用户设备执行的步骤包括：
在步骤S101，第一用户设备向第二用户设备发送请求(request)信息。
其中，可选地，所述请求信息是对于侧行通信用户设备之间协同消息(Inter-UE coordination message)的请求。
可选地，所述请求信息是通过SCI发送的，或者MAC CE发送的，或者RRC信令发送的。
可选地，所述请求信息至少包含所述第一用户设备的资源选择窗口的指示信息；可选地，所述指示信息包括所述资源选择窗口的起始时刻T start，和/或，所述资源选择窗口的终止时刻T end；或者，所述第二用户设备根据所述指示信息确定所述资源选择窗口的起始时刻T start，和/或，所述资源选择窗口的终止时刻T end。
在步骤S102，所述第二用户设备确定所述第一用户设备偏好的资源集合(preferred resource set)。
其中，所述第二用户设备触发确定所述偏好的资源集合的时刻是时隙n，或者，所述第二用户设备用于确定所述偏好的资源集合所监听的终止时隙是
Figure PCTCN2022129503-appb-000052
其中，所述第二用户设备在时隙
Figure PCTCN2022129503-appb-000053
上接收到侧行通信控制信息SCI。
所述SCI中的资源预留周期指示域指示的资源预留周期为P rsvp_RX。
以及，可选地，所述第二用户设备确定(在所述资源选择窗口中)假设(会)接收到的(assume to receive)和在所述时隙
Figure PCTCN2022129503-appb-000054
上接收到的所述SCI相同的SCI的数目Q。
具体地，可选地，当且仅当(ifand only if)在所述SCI中存在所述资 源预留周期指示域的情况下，用户设备假设(会)在时隙
Figure PCTCN2022129503-appb-000055
上接收到和所述SCI相同的SCI。其中，
Figure PCTCN2022129503-appb-000056
T′ max表示在10240ms内(SFN/DFN 0-SFN/DFN 1023)属于资源池的时隙数目；其中，可选地，如果P rsvp_RX＜W和/或n′-m≤P′ rsvp_RX，那么，
Figure PCTCN2022129503-appb-000057
或者，
Figure PCTCN2022129503-appb-000058
Figure PCTCN2022129503-appb-000059
或者，
Figure PCTCN2022129503-appb-000060
Figure PCTCN2022129503-appb-000061
或者，
Figure PCTCN2022129503-appb-000062
Figure PCTCN2022129503-appb-000063
或者，
Figure PCTCN2022129503-appb-000064
否则Q＝1，或者，
Figure PCTCN2022129503-appb-000065
或者，
Figure PCTCN2022129503-appb-000066
或者，
Figure PCTCN2022129503-appb-000067
或者，
Figure PCTCN2022129503-appb-000068
其中，W表示所述资源选择窗口的时间长度。如果所述时隙n属于资源池中的时隙，那么
Figure PCTCN2022129503-appb-000069
否则，
Figure PCTCN2022129503-appb-000070
是所述时隙n之后的首个属于资源池的时隙。
所述第二用户设备至少根据所述Q确定所述第一用户设备偏好的资源集合。
[实施例二]
在本发明的实施例二中，用户设备执行的步骤包括：
在步骤一，第一用户设备向第二用户设备发送请求(request)信息。
其中，可选地，所述请求信息是对于侧行通信用户设备之间协同消息(Inter-UE coordination message)的请求。
可选地，所述请求信息是通过SCI发送的，或者MAC CE发送的，或者RRC信令发送的。
可选地，所述请求信息至少包含所述第一用户设备的资源选择窗口的指示信息；可选地，所述指示信息包括所述资源选择窗口的起始时刻T start，和/或，所述资源选择窗口的终止时刻T end；或者，所述第二用户设备根据所述指示信息确定所述资源选择窗口的起始时刻T start，和/或，所述资源选择窗口的终止时刻T end。
在步骤二，所述第二用户设备确定所述第一用户设备偏好的资源集合(preferred resource set)。
其中，所述第二用户设备触发确定所述偏好的资源集合的时刻是时隙n，或者，所述第二用户设备用于确定所述偏好的资源集合所监听的终止时隙是
Figure PCTCN2022129503-appb-000071
其中，所述第二用户设备在时隙
Figure PCTCN2022129503-appb-000072
上接收到侧行通信控制信息SCI。
所述SCI中的资源预留周期指示域指示的资源预留周期为P rsvp_RX。
以及，可选地，所述第二用户设备确定(在所述资源选择窗口中)假设(会)接收到的(assume to receive)和在所述时隙
Figure PCTCN2022129503-appb-000073
上接收到的所述SCI相同的SCI的数目Q。
具体地，可选地，当且仅当(ifand only if)在所述SCI中存在所述资源预留周期指示域的情况下，用户设备假设(会)在时隙
Figure PCTCN2022129503-appb-000074
上接收到和所述SCI相同的SCI。其中，
Figure PCTCN2022129503-appb-000075
T′ max表示在10240ms内(SFN/DFN 0-SFN/DFN 1023)属于资源池的时隙数目；其中，可选地，(如果n′-m≤P′ rsvp_RX)，那么，
Figure PCTCN2022129503-appb-000076
或者，
Figure PCTCN2022129503-appb-000077
或者，
Figure PCTCN2022129503-appb-000078
或者，
Figure PCTCN2022129503-appb-000079
或者，
Figure PCTCN2022129503-appb-000080
(否则，Q＝1。)如果所述时隙n属于资源池中的时隙，那么
Figure PCTCN2022129503-appb-000081
否则，
Figure PCTCN2022129503-appb-000082
是所述时隙n之后的首个属于资源池的时隙。
所述第二用户设备至少根据所述Q确定所述第一用户设备偏好的资源集合。
图4是表示本发明所涉及的用户设备UE的框图。如图4所示，该用户设备UE80包括处理器801和存储器802。处理器801例如可以包括微处理器、微控制器、嵌入式处理器等。存储器802例如可以包括易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器等。存储器802上存储有程序指令。该指令在由处理器801运行时，可以执行本发明详细描述的由用户设备执行的上述方法。
上文已经结合优选实施例对本发明的方法和涉及的设备进行了描述。本领域技术人员可以理解，上面示出的方法仅是示例性的，而且以上说明的各实施例在不发生矛盾的情况下能够相互组合。本发明的方法并不局限于上面示出的步骤和顺序。上面示出的网络节点和用户设备可以包括更多的模块，例如还可以包括可以开发的或者将来开发的可用于基站、MME、或UE的模块等等。上文中示出的各种标识仅是示例性的而不是限制性的，本发明并不局限于作为这些标识的示例的具体信元。本领域技术人员根据所示实施例的教导可以进行许多变化和修改。
应该理解，本发明的上述实施例可以通过软件、硬件或者软件和硬件两者的结合来实现。例如，上述实施例中的基站和用户设备内部的各种组件可以通过多种器件来实现，这些器件包括但不限于：模拟电路器件、数 字电路器件、数字信号处理(DSP)电路、可编程处理器、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、可编程逻辑器件(CPLD)，等等。
在本申请中，“基站”可以指具有较大发射功率和较广覆盖面积的移动通信数据和控制交换中心，包括资源分配调度、数据接收发送等功能。“用户设备”可以指用户移动终端，例如包括移动电话、笔记本等可以与基站或者微基站进行无线通信的终端设备。
此外，这里所公开的本发明的实施例可以在计算机程序产品上实现。更具体地，该计算机程序产品是如下的一种产品：具有计算机可读介质，计算机可读介质上编码有计算机程序逻辑，当在计算设备上执行时，该计算机程序逻辑提供相关的操作以实现本发明的上述技术方案。当在计算系统的至少一个处理器上执行时，计算机程序逻辑使得处理器执行本发明实施例所述的操作(方法)。本发明的这种设置典型地提供为设置或编码在例如光介质(例如CD-ROM)、软盘或硬盘等的计算机可读介质上的软件、代码和/或其他数据结构、或者诸如一个或多个ROM或RAM或PROM芯片上的固件或微代码的其他介质、或一个或多个模块中的可下载的软件图像、共享数据库等。软件或固件或这种配置可安装在计算设备上，以使得计算设备中的一个或多个处理器执行本发明实施例所描述的技术方案。
此外，上述每个实施例中所使用的基站设备和终端设备的每个功能模块或各个特征可以由电路实现或执行，所述电路通常为一个或多个集成电路。设计用于执行本说明书中所描述的各个功能的电路可以包括通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)或通用集成电路、现场可编程门阵列(FPGA)或其他可编程逻辑器件、分立的门或晶体管逻辑、或分立的硬件组件、或以上器件的任意组合。通用处理器可以是微处理器，或者所述处理器可以是现有的处理器、控制器、微控制器或状态机。上述通用处理器或每个电路可以由数字电路配置，或者可以由逻辑电路配置。此外，当由于半导体技术的进步，出现了能够替代目前的集成电路的先进技术时，本发明也可以使用利用该先进技术得到的集成电路。
尽管以上已经结合本发明的优选实施例示出了本发明，但是本领域的技术人员将会理解，在不脱离本发明的精神和范围的情况下，可以对本发 明进行各种修改、替换和改变。因此，本发明不应由上述实施例来限定，而应由所附权利要求及其等价物来限定。

Claims (10)

  1. 一种由用户设备执行的方法，包括：
    第一用户设备向第二用户设备发送请求信息；以及
    第二用户设备确定所述第一用户设备偏好的资源集合。
  2. 根据权利要求1所述的方法，其特征在于，
    所述请求信息是对于侧行通信用户设备之间协同消息的请求。
  3. 根据权利要求2所述的方法，其特征在于，
    所述请求信息至少包含所述第一用户设备的资源选择窗口的起始时刻T start，和/或，所述资源选择窗口的终止时刻T end。
  4. 根据权利要求1所述的方法，其特征在于，
    所述第二用户设备触发确定所述偏好的资源集合的时刻是时隙n，或者，所述第二用户设备用于确定所述偏好的资源集合所监听的终止时隙是
    Figure PCTCN2022129503-appb-100001
  5. 根据权利要求3所述的方法，其特征在于，
    所述第二用户设备在时隙
    Figure PCTCN2022129503-appb-100002
    上接收到侧行通信控制信息SCI；以及
    所述SCI中的资源预留周期指示域指示的资源预留周期为P rsvp_RX。
  6. 根据权利要求5所述的方法，其特征在于，
    所述第二用户设备确定在所述资源选择窗口中假设会接收到的和在所述时隙
    Figure PCTCN2022129503-appb-100003
    上接收到的所述SCI相同的SCI的数目Q。
  7. 根据权利要求6所述的方法，其特征在于，
    当且仅当在所述SCI中存在所述资源预留周期指示域的情况下，用户设备假设会在时隙
    Figure PCTCN2022129503-appb-100004
    上接收到和所述SCI相同的SCI。其中，
    Figure PCTCN2022129503-appb-100005
    T′ max表示在10240ms内(SFN/DFN 0-SFN/DFN 1023)属于资源池的时隙数目；其中，如果P rsvp_RX＜W并且n′-m≤P′ rsvp_RX，那么，
    Figure PCTCN2022129503-appb-100006
    否则Q＝1，q＝Q。其中，所述W表示所述资源选择窗口的时间长度。如果所述时隙n属于资 源池中的时隙，那么
    Figure PCTCN2022129503-appb-100007
    否则，
    Figure PCTCN2022129503-appb-100008
    是所述时隙n之后的首个属于资源池的时隙。
  8. 根据权利要求6所述的方法，其特征在于，
    当且仅当在所述SCI中存在所述资源预留周期指示域的情况下，用户设备假设会在时隙
    Figure PCTCN2022129503-appb-100009
    上接收到和所述SCI相同的SCI。其中，
    Figure PCTCN2022129503-appb-100010
    T′ max表示在10240ms内(SFN/DFN 0-SFN/DFN 1023)属于资源池的时隙数目；其中，如果n′-m≤P′ rsvp_RX，那么，
    Figure PCTCN2022129503-appb-100011
    否则，Q＝1。如果所述时隙n属于资源池中的时隙，那么
    Figure PCTCN2022129503-appb-100012
    否则，
    Figure PCTCN2022129503-appb-100013
    是所述时隙n之后的首个属于资源池的时隙。
  9. 根据权利要求7或8所述的方法，其特征在于，
    所述第二用户设备至少根据所述Q确定所述第一用户设备偏好的资源集合。
  10. 一种用户设备，包括：
    处理器；以及
    存储器，存储有指令；
    其中，所述指令在由所述处理器运行时执行根据权利要求1至9中任一项所述的方法。
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