WO2021228138A1 - 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
WO2021228138A1
WO2021228138A1 PCT/CN2021/093314 CN2021093314W WO2021228138A1 WO 2021228138 A1 WO2021228138 A1 WO 2021228138A1 CN 2021093314 W CN2021093314 W CN 2021093314W WO 2021228138 A1 WO2021228138 A1 WO 2021228138A1
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Prior art keywords
mcs
pssch
user equipment
transmission
mcs table
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PCT/CN2021/093314
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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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Publication of WO2021228138A1 publication Critical patent/WO2021228138A1/zh

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    • 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]
    • H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
    • 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
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1221—Wireless traffic scheduling based on age of data to be sent
    • 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 field of wireless communication technology, and in particular to methods 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 devices without being forwarded by a base station or core network.
  • 3rd Generation Partnership Project 3rd Generation Partnership Project
  • the upper layer supports Unicast and Groupcast communication functions.
  • V2X stands for Vehicle to Everything, and hopes to realize the information interaction between vehicles and all entities that may affect vehicles. The purpose is to reduce accidents, alleviate traffic congestion, reduce environmental pollution and provide other information services.
  • the application scenarios of V2X mainly include 4 aspects:
  • V2V Vehicle to Vehicle, that is, vehicle-to-vehicle communication
  • V2P Vehicle to Pedestrian, that is, the vehicle sends a warning to pedestrians or non-motorized vehicles
  • V2N Vehicle to Network, that is, the vehicle connects to the mobile network
  • V2I Vehicle to Infrastructure, that is, communication between vehicles and road infrastructure.
  • V2X stage 1 introduced a new D2D communication interface called the PC5 interface.
  • the PC5 interface is mainly used to solve the problem of cellular car networking communication in high-speed (up to 250 km/h) and high-node density environments. Vehicles can interact with information such as position, speed and direction through the PC5 interface, that is, vehicles can communicate directly through the PC5 interface.
  • the functions introduced by LTE Release 14 V2X mainly include:
  • the second stage 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 the feasibility study of transmit diversity.
  • ⁇ NR sidelink supports all three MCS tables for CP-OFDM modulation and coding schemes defined in Rel15NR.
  • At least one MCS table is configured or pre-configured.
  • the MCS table is indicated in the SCI, and one or more MCS tables are configured or pre-configured in the configuration information of the resource pool.
  • the configuration information of the resource pool contains a default (default) MCS table
  • the number of bits used to indicate the indication field of the MCS table in the SCI is 0 bit (corresponding to the case of additional configuration or pre-configuration of 0 MCS tables), or 1 bit (corresponding to the case of additional configuration or pre-configuration of 1 MCS table) , Or, 2 bits (corresponding to the case of additional configuration or pre-configuration of 2 MCS tables).
  • the receiving user equipment does not support sending the MCS table indicated by the user equipment in the SCI, then the receiving user equipment does not need to decode the corresponding PSSCH.
  • the time domain density (time density) of the phase tracking reference signal PT-RS is related to the MCS index (MCS index) in the MCS table.
  • the solution of the present invention mainly includes receiving the TB indicating transmission in the SCI received by the user equipment In the case of retransmission, a method to determine the time domain density of the NR sidelink phase tracking reference signal PT-RS.
  • 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 RAN1#98bis, Chairman notes, section 7.2.4.1
  • Non-Patent Document 7 RAN1#100bis, Chairman notes, section 7.2.4.1
  • the present invention provides a method executed by a user equipment and a user equipment.
  • the method executed by the user equipment of the first aspect of the present invention includes: receiving PSCCH and corresponding PSSCH sent by other side-line communication user equipment; and, the transmission block TB transmitted on the PSSCH is a retransmission, and the PSCCH
  • the indicated modulation and coding scheme MCS table is different from the modulation and coding scheme MCS table corresponding to the initial transmission of the transport block TB, the time domain density of the side-line communication phase tracking reference signal PT-RS is determined.
  • the PSCCH carries first-level sideline communication control information SCI.
  • the first-level SCI includes an indication field of a modulation and coding scheme MCS table; and the first-level SCI includes an indication field of the MCS.
  • the PSSCH carries second-level sideline communication control information SCI.
  • the indication field of the MCS is greater than the retransmission threshold, and the side-line communication user equipment determines that the PSSCH transmission is a retransmission.
  • the MCS table indicated by the indication field of the MCS table and the MCS table corresponding to the initial transmission of the PSSCH transmission transport block TB are different MCS tables .
  • the MCS used to determine the time domain density L of the PT-RS is obtained from the MCS of the first transmission of the transport block TB transmitted by the PSSCH.
  • the MCS of the initial transmission of the transport block TB transmitted by the PSSCH is less than or equal to the retransmission threshold corresponding to the MCS table corresponding to the initial transmission.
  • the user equipment of the second aspect of the present invention includes: a processor; and a memory storing instructions; wherein the instructions execute the method of the first aspect when run by the processor.
  • Fig. 1 is a schematic diagram showing LTE V2X UE side-line communication.
  • Fig. 2 is a schematic diagram showing the resource allocation mode 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 schematic diagram showing the basic process of the method executed by the user equipment in the second embodiment of the invention.
  • Fig. 5 is a block diagram showing 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-line communication control information
  • PSCCH Physical Sidelink Control Channel, physical sidelink control channel
  • MCS Modulation and Coding Scheme, modulation and coding scheme
  • RB Resource Block, resource block
  • CRB Common Resource Block, common 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 received 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 side link discovery channel
  • PSBCH Physical Sidelink Broadcast Channel, physical side-line communication broadcast channel
  • TDD Time Division Duplexing, Time Division Duplexing
  • FDD Frequency Division Duplexing, Frequency Division Duplexing
  • SIB1 System Information Block Type 1, System Information Block Type 1
  • SLSS Sidelink synchronization Signal, side-line communication synchronization signal
  • PSSS Primary Sidelink Synchronization Signal, the main synchronization signal of side-line communication
  • SSSS Secondary Sidelink Synchronization Signal, secondary synchronization signal for side-line communication
  • PCI Physical Cell ID, physical cell ID
  • PSS Primary Synchronization Signal, the primary synchronization signal
  • SSS Secondary Synchronization Signal, secondary synchronization signal
  • BWP BandWidth Part, BandWidth Part/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, master cell group
  • SCG Secondary Cell Group, secondary cell group
  • PCell Primary Cell, primary cell
  • SCell Secondary Cell, secondary cell
  • PSFCH Physical Sidelink Feedback Channel, the physical sidelink feedback channel
  • SPS Semi-Persistant Scheduling, semi-static scheduling
  • PT-RS Phase-Tracking Reference Signals, phase tracking reference signal
  • Transport Block transport block
  • CB Code Block, code 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
  • V2X and sidelink mentioned in the specification of the present invention have the same meaning.
  • V2X in the text can also mean sidelink; similarly, sidelink in the text can also mean V2X, and no specific distinction and limitation will be made in the following text.
  • the resource allocation mode of V2X (sidelink) communication and the transmission mode of V2X (sidelink) communication in the specification of the present invention can be replaced equally.
  • the resource allocation mode involved in the specification can represent a transmission mode, and the related transmission mode can represent a resource allocation mode.
  • the PSCCH in the specification of the present invention is used to carry SCI.
  • the PSCCH corresponding, or, corresponding, or, related, or scheduled PSSCH means the same meaning, and they all mean associated PSSCH or corresponding PSSCH.
  • the PSSCH referred to in the specification, or, corresponding, or related SCI (including the first-level SCI and the second-level SCI) have the same meaning, and they all mean associated SCI or corresponding SCI. It is worth pointing out that the first level of SCI is called the 1st stage SCI and is transmitted in PSCCH; the second level of SCI is called 2nd stage SCI and is transmitted in the corresponding PSSCH resources.
  • Out-of-Coverage side-line communication Two UEs performing sidelink communication have no network coverage (for example, the UE cannot detect anything that meets the "cell selection criteria" on the frequency where sidelink communication is required. Cell, which means that the UE has no network coverage).
  • Both UEs performing sidelink communication have network coverage (for example, the UE detects at least one cell that meets the "cell selection criteria" on the frequency that needs sidelink communication, Indicates that the UE has network coverage).
  • Partial-Coverage (Partial-Coverage) side-line communication One UE performing sidelink communication has no network coverage, and the other UE has network coverage.
  • the UE From the UE side, the UE has only two scenarios without network coverage and with network coverage. Part of the network coverage is described from the perspective of sidelink communication.
  • Fig. 1 is a schematic diagram showing LTE V2X UE side-line communication.
  • UE1 sends sideline 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 sideline communication data to UE2, which is carried by the physical layer channel PSSCH.
  • the PSCCH and the corresponding PSSCH adopt a frequency division multiplexing mode, that is, the PSCCH and the corresponding PSSCH are located on the same subframe in the time domain and on different RBs in the frequency domain.
  • the specific design methods of PSCCH and PSSCH are as follows:
  • PSCCH occupies one subframe in the time domain and two consecutive RBs in the frequency domain.
  • the initialization of the scrambling sequence adopts a predefined value 510.
  • PSCCH can carry SCI format 1, where SCI format 1 contains at least frequency domain resource information of PSSCH. For example, for the frequency domain resource indicator field, SCI format 1 indicates the starting sub-channel number and the number of consecutive sub-channels of the PSSCH corresponding to the PSCCH.
  • PSSCH occupies a 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.
  • the sub-channel represents n subCHsize consecutive RBs in the frequency domain.
  • n subCHsize is configured by the RRC parameter, and the number of starting sub-channels and consecutive sub-channels It is indicated by the frequency domain resource indicator field of SCI format 1.
  • Fig. 2 shows two resource allocation methods of LTE V2X, which are respectively called resource allocation based on base station scheduling (Transmission Mode 3) and resource allocation based on UE sensing (sensing) (Transmission Mode 4).
  • the base station can configure the UE's resource allocation mode through UE-level dedicated RRC signaling (dedicated RRC signaling) SL-V2X-ConfigDedicated, or called the UE's transmission mode ,
  • UE-level dedicated RRC signaling dedicated RRC signaling
  • SL-V2X-ConfigDedicated SL-V2X-ConfigDedicated
  • Resource allocation mode based on base station scheduling indicates that the frequency domain resources used for sidelink sideline 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) includes the frequency domain resources of the PSSCH, and the CRC of the PDCCH or EPDCCH carrying the DCI format 5A is scrambled by the SL-V-RNTI.
  • the base station configures one or more (at most 8) configured scheduling 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, as well as the indication information (3 bits) of the scheduling permission number and the indication information of SPS activation (activate) or release (release or deactivation).
  • the CRC of the PDCCH or EPDCCH carrying the DCI format 5A is scrambled by the 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 through PDCCH or EPDCCH (DCI format 5A, CRC uses SL-V-RNTI scrambling or SL-SPS-V-RNTI scrambling) ) Send an uplink scheduling permission UL grant to the UE.
  • the uplink scheduling grant UL grant includes at least the scheduling information of the PSSCH frequency domain resources in the sidelink communication.
  • the PSSCH frequency domain resource indicator field in the uplink scheduling grant UL grant (DCI format 5A) is used as the PSCCH (SCI format 1) indicates the frequency domain resource information of the PSSCH, and sends PSCCH (SCI format 1) and the corresponding PSSCH.
  • the UE receives the SL-SPS-V-RNTI scrambled DCI format 5A on the downlink subframe n. If the DCI format 5A contains the indication information of SPS activation, the UE determines the frequency domain resource of the PSSCH according to the indication information in the DCI format 5A, and determines the time domain resource of the PSSCH (PSSCH transmission subframe) according to information such as subframe n.
  • Resource allocation method based on UE sensing indicates that the resources used for sidelink communication are based on the UE's sensing process of the candidate available resource set.
  • the RRC signaling SL-V2X-ConfigDedicated is set to ue-Selected-r14, it indicates that the UE is configured in the transmission mode based on UE sensing.
  • the base station configures the available transmission resource pool, and the UE determines the PSSCH sidelink transmission resource in the transmission resource pool (resource pool) according to certain rules (for detailed description of the process, refer to the LTE V2X UE sensing process section) , And send PSCCH (SCI format 1) and the corresponding PSSCH.
  • the resources sent and received by the UE belong to the resource pool.
  • the base station schedules transmission resources for the sidelink UE in the resource pool, or for the transmission mode based on UE perception in sideline communication, the UE determines the transmission resources in the resource pool.
  • the parameter set numerology includes two meanings of subcarrier spacing and cyclic prefix CP length.
  • ⁇ ⁇ f 2 ⁇ ⁇ 15[kHz] CP (cyclic prefix) 0 15 normal 1 30 normal 2 60 Normal, extended 3 120 normal 4 240 normal
  • each slot contains 14 OFDM symbols; for extended CP, each slot contains 12 OFDM symbols.
  • LTE only supports 15kHz subcarrier spacing.
  • extended (Extended) CP is supported, as well as normal CP.
  • the subframe has a duration of 1ms and includes two time slots, each of which has a duration of 0.5ms.
  • 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.
  • the resource block RB is defined in the frequency domain as For a continuous sub-carrier, for example, for a sub-carrier interval of 15 kHz, the RB is 180 kHz in the frequency domain. For the subcarrier spacing of 15kHz ⁇ 2 ⁇ , the resource unit RE represents 1 subcarrier in the frequency domain and 1 OFDM symbol in the time domain.
  • the modulation order of the modulation method adopted by the N bits is m (indicating that a coded modulation symbol or a modulation symbol contains m bits)
  • the number of modulation symbols obtained is denoted as s, which means that during resource mapping, the number of rate-matched bits occupying the resource unit RE is s, and the total number of bits is equal to s*m , And s*m ⁇ N.
  • the MCS table is indicated in the SCI, and one or more MCS tables are configured or pre-configured in the configuration information of the resource pool.
  • the configuration information of the resource pool contains a default (default) MCS table (Table 1);
  • the number of bits used to indicate the indication field of the MCS table in the SCI is 0 bit (corresponding to the case of additional configuration or pre-configuration of 0 MCS tables, that is, only the case of Table 1), or 1 bit (corresponding to additional configuration or pre-configuration) Configuration of 1 MCS table), or 2 bits (corresponding to the case of additional configuration or pre-configuration of 2 MCS tables).
  • MCS indexes 29 to 31 indicate that the PSSCH transmission TB is retransmission; similarly, in Table 2, MCS indexes 28 to 31 indicate that the PSSCH transmission TB is retransmission; in Table 3, MCS indexes 29 to 31 indicates that the TB transmitted by the PSSCH is a retransmission.
  • PT-RS is used to track phase fluctuations in the entire transmission cycle (for example, a time slot). Since PT-RS is designed to track phase noise, PT-RS is dense in the time domain and sparse in the frequency domain. PT-RS will only appear together with DMRS, and PT-RS will be sent only when the network is configured with PT-RS.
  • PT-RS occupies the first symbol allocated for PDSCH or PUSCH transmission, and counts according to OFDM symbols from the start symbol, and every count reaches L (L represents the time domain density of PT-RS), PT -RS will occupy one OFDM symbol and reset the counter, and then continue to count subsequent symbols.
  • the repeat count will be reset every time it encounters the DM-RS, because it is not necessary to insert a PT-RS immediately after the DM-RS to estimate the phase noise.
  • the density L in the time domain is related to the scheduled MCS index.
  • the time domain density L of the PT-RS determined by the UE includes but is not limited to the MCS (index) indicated by the base station.
  • the sidelink PT-RS is introduced in the NR sidelink.
  • the user equipment performs phase tracking according to the received PT-RS to improve the demodulation performance.
  • the solution of this patent is a method of determining the time domain density L of the PT-RS in the sidelink, and the specific method is a method of determining the MCS (index) corresponding to the retransmission, and then determining the sidelink PT-RS time domain density L.
  • FIG. 3 is a schematic diagram showing the basic process of the method executed by the user equipment in the first embodiment of the present invention.
  • the steps performed by the user equipment include:
  • step S101 the side-line communication user equipment receives the PSCCH and the corresponding PSSCH sent by other user equipment.
  • the PSCCH carries the first stage sideline communication control information SCI (1 st stage SCI).
  • the first level SCI includes the indication field of the MCS table of the modulation and coding scheme.
  • the first-level SCI includes an indication field of MCS (index).
  • the PSSCH carries second stage sideline communication control information SCI (2 nd stage SCI).
  • the side-line communication user equipment determines that the PSSCH is a retransmission according to the first level SCI and/or the second level SCI,
  • the MCS table indicated by the indication field of the MCS table and the MCS table corresponding to the second transmission corresponding to the transport block TB of the PSSCH transmission are different MCS tables, or the same MCS table.
  • the second transmission corresponding to the TB represents the initial transmission of the TB, or the latest transmission closest to the PSSCH transmission.
  • step S102 the side-line communication user equipment determines the time-domain density L of the side-line communication phase tracking reference signal PT-RS corresponding to the PSSCH transmission.
  • the MCS (index) used to determine the time domain density L of the PT-RS is obtained from the MCS (index) of the second transmission corresponding to the transmission block TB transmitted by the PSSCH.
  • the MCS (index) of the second transmission corresponding to the transmission block TB of the PSSCH transmission is less than or equal to V corresponding to the MCS table corresponding to the second transmission.
  • FIG. 4 is a schematic diagram showing the basic process of the method executed by the user equipment in the second embodiment of the present invention.
  • the steps performed by the user equipment include:
  • step S201 the side-line communication user equipment transmits the first PSCCH and the corresponding first PSSCH.
  • the first level SCI carried by the first PSCCH includes a first MCS table indication field.
  • the transport block TB transmitted by the first PSSCH is an initial transmission of the TB, or a certain retransmission of the TB.
  • step S202 the user equipment sends a second PSCCH and a corresponding second PSSCH.
  • the first level SCI carried by the second PSCCH includes a second MCS table indication field.
  • the first level SCI carried by the second PSCCH includes an indication field of MCS (index).
  • the transport block TB transmitted by the second PSSCH and the transport block TB transmitted by the first PSSCH are the same TB.
  • the first MCS table indicated by the first MCS table indication field and the second MCS table indicated by the second MCS table indication field are the same MCS table
  • the first MCS table indication field indicates the first The MCS table and the second MCS table indicated by the second MCS table indication field are the same MCS table.
  • Fig. 5 is a block diagram showing a user equipment UE related 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 non-volatile memory (such as a flash memory), or other memories.
  • the memory 802 stores program instructions. When the instruction is run by the processor 801, it can execute the above-mentioned method executed by the user equipment described in detail in the present invention.
  • 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 various embodiments described above can be combined with each other without any contradiction.
  • the method of the present invention is not limited to the steps and sequence shown above.
  • the network nodes 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 base stations, MMEs, or UEs, and so on.
  • 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. Those skilled in the art can make many changes and modifications based on the teaching of the illustrated embodiment.
  • the above-mentioned embodiments of the present invention can be implemented by software, hardware, or a combination of both software and hardware.
  • the various components inside the base station and user equipment in the above embodiments can be implemented by a variety of devices, including but not limited to: analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, programmable processing Device, application specific integrated circuit (ASIC), field programmable gate array (FPGA), programmable logic device (CPLD), etc.
  • DSP digital signal processing
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • CPLD programmable logic device
  • base station may refer to a mobile communication data and control switching center with larger transmission power and wider coverage area, including functions such as resource allocation and scheduling, data reception and transmission.
  • User equipment may refer to a user's mobile terminal, for example, including mobile phones, notebooks, and other terminal devices that can communicate with base stations or micro base stations wirelessly.
  • the embodiments of the present invention disclosed herein can be implemented on a computer program product.
  • the computer program product is a product that has a computer-readable medium with computer program logic encoded on the computer-readable medium, and when executed on a computing device, the computer program logic provides related operations to implement The above technical solution of the present invention.
  • the computer program logic When executed on at least one processor of the computing system, the computer program logic causes the processor to perform the operations (methods) described in the embodiments of the present invention.
  • This arrangement of the present invention is 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), a floppy disk or a hard disk, or as software, code and/or other data structures such as one or more Firmware or microcode on a ROM or RAM or PROM chip, or downloadable software images, shared databases, etc. in one or more modules.
  • Software or firmware or such a configuration may be installed on a 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 the terminal device used in each of the foregoing embodiments may be implemented or executed by a circuit, and the circuit is usually one or more integrated circuits.
  • Circuits designed to perform the functions described in this specification can include general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC) or general-purpose integrated circuits, field programmable gate arrays (FPGA), or other Programming logic devices, discrete gate or transistor logic, or discrete hardware components, or any combination of the above devices.
  • the general-purpose processor may be a microprocessor, or the processor may 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.

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：接收其他侧行通信用户设备发送的PSCCH和相应的PSSCH；在所述PSSCH传输的传输块TB为重传，并且所述PSCCH指示的调制与编码方案MCS表格与所述传输块TB的初传对应的调制与编码方案MCS表格不相同的情形下，确定侧行通信相位跟踪参考信号PT-RS的时域密度。

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2019年10月3GPP RAN1#98bis次会议上(参见非专利文献6)，关于NR sidelink中的调制方式，达成了如下会议结论：
●在NR sidelink中支持256QAM调制。
■从发送用户设备角度来讲，是否支持256QAM调制是基于UE能力的(UE capability)；
■64QAM调制对于用户设备是必选的(mandatory)。
同样地，在2019年10月3GPP RAN1#98bis次会议上(参见非专利文献6)，关于NR sidelink中的MCS表格，达成了如下会议结论：
●NR sidelink中支持所有在Rel15NR中定义的三个用于 CP-OFDM的调制与编码方案MCS表格。
●在NR sidelink的资源池中，至少配置或者预配置一个MCS表格。
在2020年4月3GPP RAN1#100bis次会议上(参见非专利文献7)，关于NR sidelink中的MCS表格的指示，达成了如下会议结论：
●MCS表格在SCI中指示，并且在资源池的配置信息中配置或者预配置一个或者多个MCS表格。
■资源池的配置信息中包含一个默认的(default)MCS表格；
■除去上述的默认的MCS表格，支持额外配置或者预配置0个，或者，1个，或者，2个MCS表格；
■SCI中用于指示MCS表格的指示域的比特数为0比特(对应额外配置或者预配置0个MCS表格的情形)，或者，1比特(对应额外配置或者预配置1个MCS表格的情形)，或者，2比特(对应额外配置或者预配置2个MCS表格的情形)。
●如果接收用户设备不支持发送用户设备在SCI中指示的MCS表格，那么，接收用户设备不需要译码相应的PSSCH。
在NR sidelink中，相位跟踪参考信号PT-RS的时域密度(time density)与MCS表格中的MCS索引(MCS index)有关，本发明的方案主要包括接收用户设备接收的SCI中指示传输的TB为重传的情况下，确定NR sidelink相位跟踪参考信号PT-RS时域密度的一种方法。
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：RAN1#98bis，Chairman notes，section 7.2.4.1
非专利文献7：RAN1#100bis，Chairman notes，section 7.2.4.1
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。
本发明的第一方面的由用户设备执行的方法，包括：接收其他侧行通信用户设备发送的PSCCH和相应的PSSCH；以及，在所述PSSCH传输的传输块TB为重传，并且所述PSCCH指示的调制与编码方案MCS表格与所述传输块TB的初传对应的调制与编码方案MCS表格不相同的情形下，确定侧行通信相位跟踪参考信号PT-RS的时域密度。
根据本发明的第一方面的由用户设备执行的方法，所述PSCCH携带了第一级侧行通信控制信息SCI。
根据本发明的第一方面的由用户设备执行的方法，所述第一级SCI中包括调制编码方案MCS表格的指示域；以及，所述第一级SCI中包括MCS的指示域。
根据本发明的第一方面的由用户设备执行的方法，所述PSSCH携带了第二级侧行通信控制信息SCI。
根据本发明的第一方面的由用户设备执行的方法，所述MCS的指示域大于重传门限值，所述侧行通信用户设备确定所述PSSCH传输为重传。
根据本发明的第一方面的由用户设备执行的方法，所述MCS表格的指示域所指示的MCS表格和所述PSSCH传输的传输块TB的初传所对应的MCS表格是不相同的MCS表格。
根据本发明的第一方面的由用户设备执行的方法，用于确定所述 PT-RS的时域密度L的MCS由所述PSSCH传输的传输块TB的所述初传的MCS获得。
根据本发明的第一方面的由用户设备执行的方法，所述PSSCH传输的传输块TB的所述初传的MCS小于或者等于所述初传对应的MCS表格对应的重传门限值。
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所述第一方面的所述方法。
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是示出了发明的实施例二中由用户设备执行的方法的基本过程的示意图。
图5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
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。
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，在PSCCH中传输；第二级SCI称为2nd stage SCI，在对应的PSSCH的资源中传输。
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。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)。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。
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。
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 PCTCN2021093314-appb-000001
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。
调制方式和调制与编码方案MCS表格
假设信息比特在进行信道编码后的比特数目为N，并且该N个比特采用的调制方式的调制阶数(modulation order)为m(表示一个编码调制符号或者调制符号包含m比特)，那么，对于该N个比特进行速率匹配(rate matching)，得到的调制符号数目表示为s，则表示在资源映射时，经过速率匹配后的比特占用资源单元RE的数目为s，总比特数目等于s*m，并且s*m≤N。值得指出的是，对于调制阶数m，当调制方式为QPSK时，m＝2，调制方式为16QAM，64QAM，256QAM时，m分别等于4，6，8。
在NR中，对于CP-OFDM波形，总共支持三个调制编码方案MCS表格，如下所示：
表1.默认(default)的MCS表格
Figure PCTCN2021093314-appb-000002
表2.带有256QAM的MCS表格
Figure PCTCN2021093314-appb-000003
表3.低频谱效率(low spectral efficiency)的MCS表格
Figure PCTCN2021093314-appb-000004
在NR sidelink中，关于MCS表格的指示，
●MCS表格在SCI中指示，并且在资源池的配置信息中配置或者预配置一个或者多个MCS表格。
■资源池的配置信息中包含一个默认的(default)MCS表格(表1)；
■除去上述的默认的MCS表格，支持额外(表2和表3)配置或者预配置0个，或者，1个，或者，2个MCS表格；
■SCI中用于指示MCS表格的指示域的比特数为0比特(对应额外配置或者预配置0个MCS表格的情形，即仅包含表1的情形)，或者，1比特(对应额外配置或者预配置1个MCS表格的情形)，或者，2比特(对应额外配置或者预配置2个MCS表格的情形)。
在表1中，MCS索引29至31表示PSSCH传输的TB为重传；类似地，在表2中，MCS索引28至31表示PSSCH传输的TB为重传；在表3中，MCS索引29至31表示PSSCH传输的TB为重传。在本专利的说明书中引入参数V(V可以称为重传门限值)，对于表1和表3，V＝28；对于表2，V＝27，当MCS索引大于V时，表示PSSCH传输的TB为重传。
相位跟踪参考信号PT-RS
在Rel-15NR中，在较高的频段上，PT-RS用来跟踪在整个传输周期(例如，一个时隙)内的相位波动。由于PT-RS设计用来跟踪相位噪声，因此PT-RS在时域上密集而在频域上稀疏。PT-RS只会和DMRS一起出现，而且只有网络配置了PT-RS的情况下才会发送PT-RS。对CP-OFDM波形，PT-RS占用PDSCH或者PUSCH传输分配的第一个符号，并从该起始符号开始按OFDM符号计数，每计数到L(L表示PT-RS的时域密度)，PT-RS就会占用一个OFDM符号并且复位计数器，然后继续对后续符号计数。重复计数每次遇到DM-RS也会复位，因为并不需要在DM-RS后面立即插入一个PT-RS来估计相位噪声。时域的密度L和调度的MCS索引相关。在NR中，以PDSCH的PT-RS为例，UE确定PT-RS的时域密度L包括但不限于基站指示的MCS(索引)。
类似地，在NR sidelink中引入了侧行通信相位跟踪参考信号sidelink PT-RS。在高频段，用户设备根据接收到的PT-RS进行相位跟踪，以提高解调性能。本专利的方案为确定sidelink中PT-RS的时域密度L的一种方法，具体方法为确定重传对应的MCS(索引)，进而确定sidelink PT-RS时域密度L的一种方法。
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，侧行通信用户设备接收其他用户设备发送的PSCCH和相应的PSSCH。
所述PSCCH携带了第一级侧行通信控制信息SCI(1 ststage SCI)。
所述第一级SCI中包括调制编码方案MCS表格的指示域。
所述第一级SCI中包括MCS(索引)的指示域。
所述PSSCH携带了第二级侧行通信控制信息SCI(2 nd stage SCI)。
可选地，所述侧行通信用户设备根据所述第一级SCI，和/或，所述第二级SCI，确定所述PSSCH为重传(retransmission)，
和/或，
可选地，所述MCS(索引)的指示域大于V(对于表1和表3，V＝28；对于表2，V＝27)，所述侧行通信用户设备确定所述PSSCH传输为重传。
可选地，所述MCS表格的指示域所指示的MCS表格和所述PSSCH传输的传输块TB对应的第二传输所对应的MCS表格是不同的MCS表格，或者，相同的MCS表格。
可选地，所述TB对应的所述第二传输表示所述TB的初传(initial transmission)，或者，与所述PSSCH传输最近的上一次(latest)传输。
在步骤S102，所述侧行通信用户设备确定所述PSSCH传输对应的侧行通信相位跟踪参考信号PT-RS的时域密度L。
可选地，用于确定所述PT-RS的时域密度L的MCS(索引)由所述PSSCH传输的传输块TB对应的所述第二传输的MCS(索引)获得(obtain)。其中，可选地，所述PSSCH传输的传输块TB对应的所述第二传输的所述MCS(索引)小于或者等于所述第二传输所对应的MCS表格所对应的V。
[实施例二]
图4是示出了本发明的实施例二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4所示的基本过程图来详细说明本发明的实施例二的由用户设备执行的方法。
如图4所示，在本发明的实施例二中，用户设备执行的步骤包括：
在步骤S201，侧行通信用户设备发送第一PSCCH和相应的第一PSSCH。
所述第一PSCCH携带的第一级SCI包含第一MCS表格指示域。
可选地，所述第一PSSCH传输的传输块TB为所述TB的初传，或者，为所述TB的某一次重传。
在步骤S202，所述用户设备发送第二PSCCH和相应的第二PSSCH。
所述第二PSCCH携带的第一级SCI包含第二MCS表格指示域。
所述第二PSCCH携带的所述第一级SCI包含MCS(索引)的指示域。
可选地，所述第二PSSCH传输的传输块TB和所述第一PSSCH传输的传输块TB是相同的TB。
可选地，所述第一MCS表格指示域指示的第一MCS表格和所述第二MCS表格指示域指示的第二MCS表格是相同的MCS表格，
或者，
当所述MCS(索引)的指示域大于V(对于表1和表3，V＝28；对于表2，V＝27)时，可选地，所述第一MCS表格指示域指示的第一MCS表格和所述第二MCS表格指示域指示的第二MCS表格是相同的MCS表格。
图5是表示本发明所涉及的用户设备UE的框图。如图5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 (9)

  1. 一种由用户设备执行的方法，包括：
    接收其他侧行通信用户设备发送的PSCCH和相应的PSSCH；以及，
    在所述PSSCH传输的传输块TB为重传，并且所述PSCCH指示的调制与编码方案MCS表格与所述传输块TB的初传对应的调制与编码方案MCS表格不相同的情形下，确定侧行通信相位跟踪参考信号PT-RS的时域密度。
  2. 根据权利要求1所述的方法，其特征在于，
    所述PSCCH携带了第一级侧行通信控制信息SCI。
  3. 根据权利要求2所述的方法，其特征在于，
    所述第一级SCI中包括调制编码方案MCS表格的指示域；以及，
    所述第一级SCI中包括MCS的指示域。
  4. 根据权利要求1所述的方法，其特征在于，
    所述PSSCH携带了第二级侧行通信控制信息SCI。
  5. 根据权利要求3所述的方法，其特征在于，
    所述MCS的指示域大于重传门限值，所述侧行通信用户设备确定所述PSSCH传输为重传。
  6. 根据权利要求3所述的方法，其特征在于，
    所述MCS表格的指示域所指示的MCS表格和所述PSSCH传输的传输块TB的初传所对应的MCS表格是不相同的MCS表格。
  7. 根据权利要求6所述的方法，其特征在于，
    用于确定所述PT-RS的时域密度L的MCS由所述PSSCH传输的传输块TB的所述初传的所述MCS获得。
  8. 根据权利要求7所述的方法，其特征在于，
    所述PSSCH传输的传输块TB的所述初传的所述MCS小于或者等于所述初传对应的所述MCS表格对应的重传门限值。
  9. 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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