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WO2023051524A1 - Procédé et dispositif de transmission d'un canal de rétroaction de liaison latérale physique - Google Patents

Procédé et dispositif de transmission d'un canal de rétroaction de liaison latérale physique Download PDF

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Publication number
WO2023051524A1
WO2023051524A1 PCT/CN2022/121731 CN2022121731W WO2023051524A1 WO 2023051524 A1 WO2023051524 A1 WO 2023051524A1 CN 2022121731 W CN2022121731 W CN 2022121731W WO 2023051524 A1 WO2023051524 A1 WO 2023051524A1
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Prior art keywords
configuration
terminal
symbol
dmrs
psfch
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Chinese (zh)
Inventor
杨聿铭
纪子超
彭淑燕
刘思綦
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path

Definitions

  • the present application belongs to the technical field of wireless communication, and in particular relates to a transmission method and device for a physical sidelink feedback channel.
  • LTE Long Term Evolution
  • UE User Equipment
  • LTE sidelink is based on broadcast communication. Although it can be used to support basic security communication of vehicle to everything (V2X), it is not suitable for other more advanced V2X services.
  • the 5th Generation New Radio (5G NR) system will support more advanced sidelink transmission designs, such as unicast, multicast or multicast, etc., so as to support more comprehensive types of services.
  • a dedicated frequency band has been allocated for LTE Sidelink communication, but due to the large difference in the design of LTE Sidelink UE and NR Sidelink UE, the current NR Sidelink UE cannot directly access this frequency band for communication.
  • NR Sidelink UEs become more and more, and the number of LTE Sidelink UEs becomes less and less, the utilization rate of frequency bands allocated to LTE Sidelink UEs is low, so some methods need to be designed so that NR Sidelink UEs can operate in these frequency bands Coexist with LTE Sidelink UEs.
  • LTE Sidelink Physical Sidelink Shared Channel (PSSCH) demodulation reference signal (Demodulatin Reference Signal, DMRS) is different from that of NR Sidelink PSSCH DMRS.
  • PSSCH Physical Sidelink Shared Channel
  • DMRS demodulation Reference Signal
  • LTE Sidelink retransmission based on Hybrid Automatic Repeat reQuest (HARQ) feedback is not supported, but only one blind retransmission is supported to enhance reliability.
  • This design mechanism is not flexible enough, and at the same time, redundant transmissions will be generated when the system congestion level is low, and when the system congestion level is high, a retransmission may not achieve the required reliability.
  • the LTE UE performs RSRP measurement, it measures the RSRP corresponding to the LTE DMRS pattern (pattern) (such as symbols 2, 5, 8, 11). In order to measure the RSRP of the NR terminal, the NR terminal can enable the LTE PSSCH DMRS pattern.
  • NR terminals support the HARQ feedback mechanism.
  • the NR terminal if the NR terminal enables HARQ feedback, because the design of the LTE PSSCH DMRS pattern does not consider the transmission of the Physical Sidelink Feedback Channel (PSFCH), when the NR terminal uses the LTE PSSCH DMRS pattern,
  • the symbol used for Automatic Gain Control (AGC) in PSFCH transmission for example, the first repeated symbol or the symbol corresponding to the start sidelink symbol (startSLsymbols) + sidelink symbol length (lengthSLsymbols)-3 will be It conflicts with the DMRS symbol position in the LTE PSSCH DMRS pattern, so it is necessary to consider how to design the PSFCH so that the NR terminal can enable HARQ feedback when the NR terminal works in the coexistence frequency band, thereby enhancing the transmission reliability of the NR terminal.
  • AGC Automatic Gain Control
  • the embodiment of the present application provides a transmission method and device for a physical sidelink feedback channel, which can solve the problem of how to design PSFCH so that the NR terminal can enable HARQ feedback when the NR terminal works in the coexistence frequency band, thereby enhancing the transmission reliability of the NR terminal question.
  • a method for transmitting a physical sidelink feedback channel including:
  • the terminal sends or receives the PSFCH, wherein the terminal sends and/or receives all or part of the symbols in the DMRS pattern of the first DMRS on the first symbol, and the first symbol is used for automatic gain control of the PSFCH.
  • a transmission device for a physical sidelink feedback channel including:
  • the transmission module is used for sending or receiving PSFCH, wherein all or part of symbols in the DMRS pattern of the first DMRS are sent and/or received on the first symbol, and the first symbol is used for automatic gain control of PSFCH.
  • a terminal in a third aspect, includes a processor, a memory, and a program or instruction stored in the memory and operable on the processor. When the program or instruction is executed by the processor The steps of the method described in the first aspect are realized.
  • a terminal including a processor and a communication interface, wherein the communication interface is used to send or receive PSFCH, wherein, the first symbol is sent and/or received in the DMRS pattern of the first DMRS All or part of symbols, the first symbol is used for PSFCH automatic gain control.
  • a readable storage medium is provided, and a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, the steps of the method according to the first aspect are implemented.
  • a sixth aspect provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the method as described in the first aspect .
  • a computer program/program product is provided, the computer program/program product is stored in a non-volatile storage medium, and the program/program product is executed by at least one processor to implement the first aspect The steps of the method.
  • a communication device configured to perform the steps of the method described in the first aspect.
  • PSFCH when the terminal transmits PSFCH, all or part of the symbols of the DMRS pattern are sent using one symbol for automatic gain control of PSFCH, so that when the DMRS pattern conflicts with the symbol position of PSFCH, the DMRS pattern is not affected
  • PSFCH enables NR terminals to enable HARQ feedback, thereby enhancing terminal transmission reliability.
  • FIG. 1 is a block diagram of a wireless communication system applicable to an embodiment of the present application
  • Fig. 2 is a schematic diagram of the detection method of LTE sidelink
  • FIG. 3 is a schematic flowchart of a method for transmitting a physical sidelink feedback channel according to an embodiment of the present application
  • Fig. 4 is a schematic diagram of the scheduling assignment (scheduling assignment, SA) mapping rule of case 1;
  • FIG. 5 is a schematic diagram of the SA mapping rule in case 2;
  • FIG. 6 is a schematic diagram of a transmission method of a physical sidelink feedback channel according to Embodiment 1 of the present application.
  • FIG. 7 is a schematic diagram of a transmission method of a physical sidelink feedback channel according to Embodiment 2 of the present application.
  • FIG. 8 is a schematic diagram of a transmission method of a physical sidelink feedback channel according to Embodiment 3 of the present application.
  • FIG. 9 is a schematic structural diagram of a transmission device for a physical sidelink feedback channel according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a terminal according to an embodiment of the present application.
  • FIG. 11 is a schematic diagram of a hardware structure of a terminal according to an embodiment of the present application.
  • first, second and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein and that "first" and “second” distinguish objects. It is usually one category, and the number of objects is not limited. For example, there may be one or more first objects.
  • “and/or” in the description and claims means at least one of the connected objects, and the character “/” generally means that the related objects are an "or” relationship.
  • LTE Long Term Evolution
  • LTE-Advanced LTE-Advanced
  • LTE-A Long Term Evolution-Advanced
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single-carrier Frequency-Division Multiple Access
  • system and “network” in the embodiments of the present application are often used interchangeably, and the described technology can be used for the above-mentioned system and radio technology, and can also be used for other systems and radio technologies.
  • the following description describes the New Radio (New Radio, NR) system for example purposes, and uses NR terminology in most of the following descriptions, but these techniques can also be applied to applications other than NR system applications, such as the 6th Generation (6th Generation , 6G) communication system.
  • 6th Generation 6th Generation
  • Fig. 1 shows a block diagram of a wireless communication system to which the embodiment of the present application is applicable.
  • the wireless communication system includes a terminal 11 and a network side device 12 .
  • the terminal 11 can also be called a terminal device or a user terminal (User Equipment, UE), and the terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal digital Assistant (Personal Digital Assistant, PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile Internet device (Mobile Internet Device, MID), wearable device (Wearable Device) or vehicle-mounted device (Vehicle User Equipment, VUE), Pedestrian Terminal (Person User Equipment, PUE) and other terminal-side equipment, wearable devices include: smart watches, bracelets, earphones, glasses, etc.
  • the network side device 12 may be a base station or a core network, where a base station may be called a node B, an evolved node B, an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service Basic Service Set (BSS), Extended Service Set (ESS), Node B, Evolved Node B (eNB), Home Node B, Home Evolved Node B, WLAN access point, WiFi node, transmission Receiving point (Transmitting Receiving Point, TRP) or some other suitable term in the field, as long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiment of this application, only The base station in the NR system is taken as an example, but the specific type of the base station is not limited.
  • sensing In the LTE sidelink (sidelink, SL), resource selection needs to be performed by sensing (Sensing). Please refer to Figure 2.
  • the basic working principle is as follows: measurement is performed within the sensing window (sensing window), and each detection transmission time interval ( Transmission Time Interval, TTI) within the scheduling assignment (scheduling assignment, SA) and interference measurement.
  • TTI Transmission Time Interval
  • SA scheduling assignment
  • the terminal demodulates the received SA, obtains resources reserved by other UEs, and excludes resources reserved by other UEs.
  • Random selection in side chain Random selection in SL
  • the resource is randomly selected within the selection window, no senisng is required.
  • Mode 2 resource allocation mode, resource selection based on sensing is supported. Its principle is similar to the sensing mechanism in LTE SL mode4. The specific working method is as follows:
  • TX UE transmitter UE determines the resource selection window after resource selection is triggered.
  • the UE Before resource selection, the UE needs to determine the candidate resource set for resource selection (candidate resource set), and compare the RSRP measured on the resources in the resource selection window with the corresponding RSRP threshold (threshold), if the RSRP is lower than the RSRP threshold, then the resource can be included in the set of alternative resources.
  • the UE After the resource set is determined, the UE randomly selects transmission resources from the candidate resource set. In addition, the UE may reserve transmission resources for the next transmission in this transmission.
  • TX UE will reserve resources allocated by it (reservation is divided into periodic reservation and aperiodic reservation), and the reserved resources will be used for future Physical Side Link Control Channel (PSCCH )/Physical Sidelink Shared Channel (PSSCH) transmission.
  • Aperiodic reservation can be implemented through the Time resource assignment (Time resource assignment) field in Sidelink Control Information (SCI), and the reserved resources can be used at least as the same transport block (Transport Block, TB) transmission.
  • Periodic reservation can be realized through the resource reservation field (Resource reservation period) field in SCI, and the periodic resources reserved in the current period can be used for the transmission of the next TB.
  • the UE transmits a physical sidelink feedback channel (Physical Sidelink Feedback Channel, PSFCH) carrying HARQ-ACK information on one or more sub-channels, as a response to the reception of the PSSCH, and the transmitted HARQ-ACK information is ACK Or NACK, or NACK only.
  • PSFCH Physical Sidelink Feedback Channel
  • the event unit in the embodiment of the present application is mainly described based on a time slot (slot) in NR, but the time unit is not limited to the slot.
  • the embodiment of the present application provides a transmission method of a physical sidelink feedback channel including:
  • Step 31 The terminal sends or receives PSFCH, wherein the terminal sends and/or receives all or part of the symbols in the DMRS pattern of the first DMRS on the first symbol, and the first symbol is used for automatic gain control of PSFCH.
  • the terminal sends and/or receives all or part of the symbols in the DMRS pattern of the first DMRS on the first symbol of a preset time unit
  • the preset time unit can be a symbol, a time slot, or a subframe , frames, milliseconds, seconds, times, etc.
  • PSFCH when the terminal transmits PSFCH, all or part of the symbols of the DMRS pattern are sent using one symbol used for PSFCH automatic gain control, so that when the DMRS pattern conflicts with the symbol position of PSFCH, it does not affect the DMRS pattern.
  • PSFCH enables NR terminals to enable HARQ feedback, thereby enhancing terminal transmission reliability.
  • the position of the first symbol includes at least one of the following:
  • startSLsymbols+lengthSLsymbols-2 corresponding to NR is the second symbol of PSFCH.
  • the second symbol of the PSFCH is the symbol of the PSFCH sequence (called PSFCH sequence symbol).
  • the information transmitted on the first symbol of the two symbols used for PSFCH automatic gain control is no longer the repetition of the information transmitted on the second symbol.
  • the second symbol is still mapped to the PSFCH sequence, and the first symbol is used to transmit all or part of the symbols in the DMRS pattern of the first DMRS.
  • the received power of the second symbol can still be adjusted based on the received power of the first symbol, so that the HARQ feedback can be sent and received normally.
  • the DMRS symbol transmitted by the first symbol is exactly the last DMRS symbol in the LTE Sidelink DMRS format, there is no need to modify the DMRS format, which ensures that the NR terminal can reuse the LTE Sidelink PSSCH DMRS format, so that compatible with LTE.
  • startSLsymbols+lengthSLsymbols-2 corresponding to NR is the first symbol of PSFCH.
  • the PSFCH sequence is mapped to the first symbol of the PSFCH, that is, at this time, the PSFCH has only one symbol and carries the PSFCH sequence. At this time, when the terminal sends the PSFCH, it will send the first symbol at the same time.
  • X startSLsymbols+lengthSLsymbols-Z
  • startSLsymbols is the start symbol position of the side link
  • lengthSLsymbols is the symbol length of the side link
  • Z is the protocol pre-definition, network pre-configuration, network configuration, network indication, terminal Preconfigured, terminal configuration, or terminal indicated value.
  • the value of Z may be 3.
  • the first symbol is the repetition of the Y-th symbol
  • Y the position of the first symbol+L
  • L is protocol pre-definition, network pre-configuration, network configuration, network indication, terminal Preconfigured, terminal configuration, or terminal indicated value.
  • L can be -3.
  • the DMRS pattern of the first DMRS is at least one of the following:
  • PSBCH LTE Sidelink Physical Sidelink Broadcast Channel
  • PSDCH LTE Sidelink Physical Sidelink Discovery Channel
  • the DMRS pattern x is a DMRS pattern of protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal indication.
  • the first symbol is used for automatic gain control of PSFCH. Since the content carried by the first symbol and the symbol of the PSFCH sequence is different, the automatic gain control based on the first symbol cannot be perfectly applied to the symbol of the PSFCH sequence. Therefore The power difference between the two symbols needs to be considered when sending, which will be described in detail below.
  • the terminal sending all or part of the symbols in the DMRS pattern of the first DMRS on the first symbol includes:
  • the terminal determines the transmission power of the first symbol, and the transmission power of the first symbol satisfies at least one of the following:
  • the transmit power of the first symbol is the same as the transmit power of other DMRS symbols in the DMRS pattern of the first DMRS;
  • the LTE terminal measures the RSRP of the NR terminal through DMRS, it does not need to adjust the power of the fourth DMRS symbol (that is, the first symbol).
  • the transmission power difference of the two symbols is additionally taken into account during the automatic gain control of the system.
  • the sending power of the first symbol is the same as the sending power of the second symbol used to send the PSFCH sequence;
  • This method has low requirements on the transmitter, but requires the receiver to additionally consider the difference in transmit power between two symbols during automatic gain control.
  • the transmit power of the first symbol is calculated and determined according to the transmit power and power control factor of the second symbol used to transmit the PSFCH sequence;
  • the transmit power of the first symbol is calculated and determined according to the transmit power of the second symbol used to transmit the PSFCH sequence and the power control factor, so that the received power of the first symbol and the second symbol received by the receiving end are the same, In this way, the reception of PSFCH sequence symbols can be adjusted according to the normal automatic gain control process.
  • the power control factor is calculated and determined according to the energy of the first symbol and the energy of the second symbol used to send the PSFCH sequence.
  • the power control factor is predefined by a protocol, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication.
  • the sending terminal notifies the receiving terminal of the power control factor.
  • the receiving end can assist in determining PSFCH power and/or automatic gain control according to the received power control factor.
  • the transmission power of the first symbol is equal to the average power of other symbols in the time slot
  • the transmission power of the first symbol is equal to a fixed power, and the fixed power is predefined by the protocol, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal indication;
  • the transmission power of the first symbol is equal to the maximum transmission power, and the maximum transmission power is predefined by the protocol, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal indication.
  • receiving the PSFCH by the terminal includes:
  • the terminal determines PSFCH power and/or automatic gain control according to the received power of the first symbol, wherein:
  • the PSFCH power and/or automatic gain control is calculated and determined according to the received power and power control factor of the first symbol;
  • the transmission power of the first symbol corresponding to this case is the same as the transmission power of other DMRS symbols in the DMRS pattern of the first DMRS, and the transmission power of the first symbol is the same as the second symbol used to send the PSFCH sequence.
  • the case where the transmit powers of the symbols are the same, and the case that the first symbol uses a fixed power or a maximum transmit power, and the like.
  • the power control factor is calculated and determined according to the energy of the first symbol and the energy of the second symbol used to send the PSFCH sequence.
  • the power control factor may be a preset value, so optionally, the power control factor is predefined by the protocol, network pre-configuration, network configuration, network indication, terminal Pre-configuration, terminal configuration or terminal indication.
  • the sending terminal notifies the receiving terminal of the power control factor.
  • the PSFCH power and/or automatic gain control are determined directly according to the received power of the first symbol.
  • the power adjustment corresponding to this situation has been processed at the transmitting end, and it can be considered that the received powers of the two symbols are consistent.
  • the transmission method of the physical sidelink feedback channel further includes: when the terminal performs resource detection, determining a first signal quality parameter according to at least one of the following, the first signal quality parameter Includes Reference Signal Received Power (RSRP) and/or Received Signal Strength Indication (RSSI):
  • RSRP Reference Signal Received Power
  • RSSI Received Signal Strength Indication
  • the first signal quality parameter is calculated and determined according to the measured first signal quality parameter of the PSSCH and the preset scaling factor.
  • the preset scaling factor is predefined by protocol, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration or terminal indication.
  • the frequency domain mapping rule of the physical sidelink feedback channel in the transmission method of the physical sidelink feedback channel according to the embodiment of the present application will be described below.
  • composition of LTE PSCCH_SCI format 1 consists of the indication fields in Table 1 below:
  • PSCCH also called SA
  • PSSCH of LTE Sidelink are transmitted in the same subframe, and the frequency domains of SA and PSSCH can be continuous or discontinuous, which are divided into two cases, as shown in Figure 4 and Figure 5.
  • Case 1 Referring to Figure 4, the SA starts mapping from the lowest frequency domain position in the lowest subchannel (subchannel) of the resource selected for data transmission, occupying two Physical Resource Blocks (PRB).
  • PRB Physical Resource Blocks
  • Case 2 Referring to Figure 5, the SA starts mapping from the frequency domain position in the SA resource pool corresponding to the lowest subchannel (subchannel) of the resource selected for data transmission, occupying two PRBs.
  • the DMRS of LTE Sidelink is generated based on the LTE Physical Uplink Shared Channel (PUSCH) DMRS:
  • PUSCH Physical Uplink Shared Channel
  • ⁇ is the number of layers
  • u is the group number
  • v is the base sequence number in the group
  • ⁇ ⁇ is the cyclic shift value
  • ⁇ 0
  • w ( ⁇ ) (m) is the orthogonal sequence
  • the unit is subcarrier and meets the following conditions:
  • n cs, ⁇ is an intermediate amount of cyclic shift.
  • PUSCH DMRS precoding is:
  • PSCCH/PSSCH DMRS generation is based on the generation of Physical Uplink Shared Channel (LTE PUSCH) DMRS, based on the following settings:
  • the PSCCH where the LTE control information SCI format 1 is located has two possibilities in the frequency domain, as described above, one is that the PSCCH is located in a specific PSCCH resource pool, and the corresponding The other is that the PSCCH is located in the lowest subchannel (subchannel) where the PSSCH is located, and occupies the lowest two PRBs in the frequency domain. Therefore, the PSFCH mapping rule needs to consider these two different situations.
  • the transmission method of the physical sidelink feedback channel further includes:
  • the terminal determines the frequency domain mapping rule of PSFCH
  • the terminal maps the PSFCH sequence to the second symbol used to send the PSFCH sequence according to the frequency domain mapping rule
  • the frequency domain mapping rule includes at least one of the following:
  • the frequency domain mapping of the PSFCH is mapped from the first physical resource block of the lowest subchannel where the PSFCH is located, and the first physical resource block is the lowest subchannel after excluding the PSCCH physical resource block;
  • the frequency domain mapping of the PSFCH starts from the lowest physical resource block of the lowest subchannel where the PSFCH is located.
  • the above PSCCH and its scheduled PSSCH are adjacent or non-adjacent in the frequency domain according to protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal indication.
  • the LTE UE When the LTE UE performs RSRP measurement, measure the RSRP corresponding to the LTE DMRS pattern (such as symbols 2, 5, 8, 11). In order to measure the RSRP of the NR terminal, the NR terminal can enable the LTE PSSCH DMRS pattern.
  • At least one of the DMRS pattern, the number of ports and the number of layers of the first DMRS is defined by protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal instructions. For example indicated by the control information SCI.
  • the generation of the sequence of the first DMRS satisfies at least one of the following:
  • LTE sidelink DMRS Reuse the generation mode of LTE sidelink DMRS to generate the sequence of the first DMRS (i.e. reuse LTE Sidelink DMRS pattern, backward compatible with LTE);
  • the sequence of the first DMRS is related to a reference signal sequence or an orthogonal sequence (defining the same process and parameters as LTE Sidelink DMRS generation), for example
  • the first pattern is an LTE PSSCH DMRS pattern.
  • the time-frequency domain mapping of the sequence of the first DMRS satisfies at least one of the following:
  • LTE Long Term Evolution
  • NR Long Term Evolution
  • the time domain is mapped to the 2nd and 5th symbols of the first time slot of the subframe and the 1st and 4th symbols of the second time slot;
  • the LTE description is reused here, that is, the description is performed in units of subframes, and the start is 0.
  • the frequency domain is mapped on the same frequency domain range as the data channel.
  • Embodiment 1 of this application PSFCH structure 1
  • AGC automatic gain control
  • the NR terminal In order to enable the NR terminal to send the PSFCH and send the DMRS according to the pattern of the LTE DMRS, so that the LTE terminal can also obtain an accurate RSRP by measuring the DMRS sent by the NR terminal, therefore, the first symbol of the PSFCH (i.e. The first symbol) is changed to send the last symbol of DMRS, so that the terminal can still perform AGC through the first symbol, and at the same time, the DMRS pattern on the NR terminal side can be backward compatible with LTE.
  • the first symbol of the PSFCH i.e. The first symbol
  • Embodiment 2 of this application PSFCH structure 2
  • the terminal will still send the 11th symbol and the 12th symbol (counting from 0) during PSFCH feedback, where the 11th symbol carries DMRS, and the 12th symbol is mapped to PSFCH sequence, but in this embodiment of the application, only the 12th symbol carrying the PSFCH sequence is referred to as the PSFCH channel.
  • Embodiment 3 of this application PSFCH frequency domain position
  • the frequency domain mapping of PSFCH needs to be mapped from the lowest PRB after excluding the two lowest PRBs of the lowest subchannel.
  • the frequency domain mapping of the PSFCH starts from the lowest PRB of the lowest subchannel.
  • the NR terminal reuses the DMRS pattern of the LTE Sidelink, so that the LTE terminal can perform resource selection by measuring the DMRS of the NR terminal and excluding the reserved resources of the NR terminal.
  • the structure of PSFCH is redesigned, so that NR terminals do not affect the DMRS structure when sending PSFCH.
  • the actions of the sending end and the receiving end to determine the sending power and receiving based on the new PSFCH structure are determined, which ensures the correct reception of the PSFCH. Since the NR terminal sends the PSFCH, the NR terminal can judge whether to perform retransmission based on the HARQ feedback information, thereby ensuring transmission reliability.
  • the execution subject may be the transmission device of the physical sidelink feedback channel, or the user in the transmission device of the physical sidelink feedback channel A control module for implementing the transmission method of the physical sidelink feedback channel.
  • the method for transmitting the physical sidelink feedback channel performed by the transmission device of the physical sidelink feedback channel is taken as an example to illustrate the transmission device of the physical sidelink feedback channel provided in the embodiment of the present application.
  • the embodiment of the present application also provides a physical sidelink feedback channel transmission device 90, including:
  • the transmission module 91 is configured to send or receive PSFCH, wherein all or part of the symbols in the DMRS pattern of the first DMRS are sent and/or received on the first symbol, and the first symbol is used for automatic gain control of PSFCH.
  • PSFCH when the terminal transmits PSFCH, all or part of the symbols of the DMRS pattern are sent using one symbol used for PSFCH automatic gain control, so that when the DMRS pattern conflicts with the symbol position of PSFCH, it does not affect the DMRS pattern.
  • PSFCH enables NR terminals to enable HARQ feedback, thereby enhancing terminal transmission reliability.
  • the position of the first symbol includes at least one of the following:
  • the Xth symbol, X startSLsymbols+lengthSLsymbols-Z, startSLsymbols is the start symbol position of the side link, lengthSLsymbols is the length of the side link symbol, Z is the protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration , terminal configuration, or the value indicated by the terminal.
  • the DMRS pattern of the first DMRS is at least one of the following:
  • the DMRS pattern x is a DMRS pattern of protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal indication.
  • what is sent and/or received on the first symbol is the Nth symbol in the DMRS pattern of the first DMRS, where N is protocol pre-definition, network pre-configuration, and network configuration , Network Indication, Endpoint Preconfiguration, Endpoint Configuration, or Endpoint Indication value.
  • the transmission module 91 includes:
  • the first determination submodule is configured to determine the transmission power of the first symbol, and the transmission power of the first symbol satisfies at least one of the following:
  • the transmission power of the first symbol is the same as the transmission power of other DMRS symbols in the DMRS pattern of the first DMRS;
  • the transmission power of the first symbol is the same as the transmission power of the second symbol used to transmit the PSFCH sequence;
  • the transmission power of the first symbol is calculated and determined according to the transmission power and power control factor of the second symbol used to transmit the PSFCH sequence;
  • the transmission power of the first symbol is equal to the average power of other symbols in the time slot
  • the transmission power of the first symbol is equal to fixed power, and the fixed power is predefined by the protocol, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal indication;
  • the transmission power of the first symbol is equal to the maximum transmission power, and the maximum transmission power is predefined by the protocol, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal indication.
  • the transmission module 91 includes:
  • the second determination submodule is used to determine PSFCH power and/or automatic gain control according to the received power of the first symbol, wherein:
  • the PSFCH power and/or automatic gain control is calculated and determined according to the received power and power control factor of the first symbol
  • the PSFCH power and/or automatic gain control are directly determined according to the received power of the first symbol.
  • the transmission device 90 of the physical sidelink feedback channel further includes:
  • the first determining module is configured to determine a first signal quality parameter according to at least one of the following when performing resource detection, where the first signal quality parameter includes RSRP and/or RSSI:
  • M is predefined by the protocol, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal indication ;
  • the first signal quality parameter is calculated and determined according to the measured first signal quality parameter of the PSSCH and the preset scaling factor.
  • the transmission device 90 of the physical sidelink feedback channel further includes:
  • the second determination module is used to determine the frequency domain mapping rule of PSFCH
  • a mapping module configured to map the PSFCH sequence to the second symbol used to send the PSFCH sequence according to the frequency domain mapping rule
  • the frequency domain mapping rule includes at least one of the following:
  • the frequency domain mapping of the PSFCH is mapped from the first physical resource block of the lowest subchannel where the PSFCH is located, and the first physical resource block is the lowest subchannel after excluding the PSCCH physical resource block;
  • the frequency domain mapping of the PSFCH is mapped from the lowest physical resource block of the lowest subchannel + M where the PSFCH is located, and M is the protocol pre-definition, network pre-configuration, and network configuration , network indication, terminal pre-configuration, terminal configuration or terminal indication value;
  • the frequency domain mapping of the PSFCH is mapped from the lowest physical resource block of the lowest subchannel where the PSFCH is located.
  • At least one of the DMRS pattern, the number of ports and the number of layers of the first DMRS is defined by protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal instructions.
  • the generation of the sequence of the first DMRS satisfies at least one of the following:
  • the sequence of the first DMRS is related to a reference signal sequence or an orthogonal sequence.
  • the time-frequency domain mapping of the sequence of the first DMRS satisfies at least one of the following:
  • the time domain is mapped to the 2nd and 5th symbols of the first slot of the subframe and the 1st and 4th symbols of the second slot;
  • the frequency domain is mapped on the same frequency domain extent as the data channel.
  • the transmission device of the physical sidelink feedback channel in the embodiment of the present application may be a device, a device with an operating system or an electronic device, or a component, an integrated circuit, or a chip in a terminal.
  • the apparatus or electronic equipment may be a mobile terminal or a non-mobile terminal.
  • the mobile terminal may include but not limited to the types of terminals 11 listed above, and the non-mobile terminal may be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television ( television, TV), teller machines or self-service machines, etc., are not specifically limited in this embodiment of the present application.
  • the transmission device for the physical sidelink feedback channel provided by the embodiment of the present application can realize each process realized by the method embodiment in FIG. 3 and achieve the same technical effect. To avoid repetition, details are not repeated here.
  • the embodiment of the present application also provides a terminal 100, including a processor 101, a memory 102, and a program or instruction stored in the memory 102 and executable on the processor 101.
  • the program or instruction is When executed, the processor 101 implements each process of the above embodiment of the transmission method for the physical sidelink feedback channel, and can achieve the same technical effect. To avoid repetition, details are not repeated here.
  • the embodiment of the present application also provides a terminal, including a processor and a communication interface, the communication interface is used to send or receive PSFCH, wherein, the terminal sends and/or receives all of the DMRS patterns of the first DMRS on the first symbol or part of symbols, the first symbol is used for PSFCH automatic gain control.
  • This terminal embodiment corresponds to the above-mentioned terminal-side method embodiment, and each implementation process and implementation mode of the above-mentioned method embodiment can be applied to this terminal embodiment, and can achieve the same technical effect.
  • FIG. 11 is a schematic diagram of a hardware structure of a terminal implementing an embodiment of the present application.
  • the terminal 110 includes but not limited to: a radio frequency unit 111, a network module 112, an audio output unit 113, an input unit 114, a sensor 115, a display unit 116, a user input unit 117, an interface unit 118, a memory 119, and a processor 1110, etc. at least some of the components.
  • the terminal 110 can also include a power supply (such as a battery) for supplying power to various components, and the power supply can be logically connected to the processor 1110 through the power management system, so as to manage charging, discharging, and power consumption through the power management system. Management and other functions.
  • a power supply such as a battery
  • the terminal structure shown in FIG. 11 does not constitute a limitation on the terminal, and the terminal may include more or fewer components than shown in the figure, or combine some components, or arrange different components, which will not be repeated here.
  • the input unit 114 may include a graphics processing unit (Graphics Processing Unit, GPU) 1141 and a microphone 1142, and the graphics processing unit 1141 is used by the image capturing device (such as the image data of the still picture or video obtained by the camera) for processing.
  • the display unit 116 may include a display panel 1161 , and the display panel 1161 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like.
  • the user input unit 117 includes a touch panel 1171 and other input devices 1172 .
  • the touch panel 1171 is also called a touch screen.
  • the touch panel 1171 may include two parts, a touch detection device and a touch controller.
  • Other input devices 1172 may include, but are not limited to, physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be repeated here.
  • the radio frequency unit 111 receives the downlink data from the network side device, and processes it to the processor 1110; in addition, sends the uplink data to the network side device.
  • the radio frequency unit 111 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.
  • the memory 119 can be used to store software programs or instructions as well as various data.
  • the memory 119 may mainly include a program or instruction storage area and a data storage area, wherein the program or instruction storage area may store an operating system, an application program or instructions required by at least one function (such as a sound playback function, an image playback function, etc.) and the like.
  • the memory 119 may include a high-speed random access memory, and may also include a nonvolatile memory, wherein the nonvolatile memory may be a read-only memory (Read-Only Memory, ROM), a programmable read-only memory (Programmable ROM) , PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically erasable programmable read-only memory (Electrically EPROM, EEPROM) or flash memory.
  • ROM Read-Only Memory
  • PROM programmable read-only memory
  • PROM erasable programmable read-only memory
  • Erasable PROM Erasable PROM
  • EPROM electrically erasable programmable read-only memory
  • EEPROM electrically erasable programmable read-only memory
  • flash memory for example at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device.
  • the processor 1110 may include one or more processing units; optionally, the processor 1110 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, application programs or instructions, etc., Modem processors mainly handle wireless communications, such as baseband processors. It can be understood that the foregoing modem processor may not be integrated into the processor 1110 .
  • the radio frequency unit 111 is configured to send or receive PSFCH, wherein the terminal sends and/or receives all or part of the symbols in the DMRS pattern of the first DMRS on the first symbol, and the first symbol is used for PSFCH Automatic Gain Control.
  • PSFCH when the terminal transmits PSFCH, all or part of the symbols of the DMRS pattern are sent using one symbol used for PSFCH automatic gain control, so that when the DMRS pattern conflicts with the symbol position of PSFCH, it does not affect the DMRS pattern.
  • PSFCH enables NR terminals to enable HARQ feedback, thereby enhancing terminal transmission reliability.
  • the position of the first symbol includes at least one of the following:
  • the Xth symbol, X startSLsymbols+lengthSLsymbols-Z, startSLsymbols is the start symbol position of the side link, lengthSLsymbols is the length of the side link symbol, Z is the protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration , terminal configuration, or the value indicated by the terminal.
  • the DMRS pattern of the first DMRS is at least one of the following:
  • the DMRS pattern x is a DMRS pattern of protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal indication.
  • N is the protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration The value of configuration, terminal configuration, or terminal indication.
  • N 4.
  • the terminal sending all or part of the symbols in the DMRS pattern of the first DMRS on the first symbol includes:
  • the terminal determines the transmission power of the first symbol, and the transmission power of the first symbol satisfies at least one of the following:
  • the transmission power of the first symbol is the same as the transmission power of other DMRS symbols in the DMRS pattern of the first DMRS;
  • the transmission power of the first symbol is the same as the transmission power of the second symbol used to transmit the PSFCH sequence;
  • the transmission power of the first symbol is calculated and determined according to the transmission power and power control factor of the second symbol used to transmit the PSFCH sequence;
  • the transmission power of the first symbol is equal to the average power of other symbols in the time slot
  • the transmission power of the first symbol is equal to fixed power, and the fixed power is predefined by the protocol, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal indication;
  • the transmission power of the first symbol is equal to the maximum transmission power, and the maximum transmission power is predefined by the protocol, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal indication.
  • receiving PSFCH includes:
  • the PSFCH power and/or automatic gain control is calculated and determined according to the received power and power control factor of the first symbol
  • the PSFCH power and/or automatic gain control are directly determined according to the received power of the first symbol.
  • the power control factor is calculated and determined according to the energy of the first symbol and the energy of the second symbol used to send the PSFCH sequence.
  • the power control factor is predefined by a protocol, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal indication.
  • the power control factor is notified by the sending terminal to the receiving terminal.
  • the processor 1110 is configured to determine a first signal quality parameter according to at least one of the following when performing resource detection, where the first signal quality parameter includes a reference signal received power RSRP and/or a received signal strength indication RSSI:
  • M is predefined by the protocol, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal indication ;
  • the first signal quality parameter is calculated and determined according to the measured first signal quality parameter of the PSSCH and the preset scaling factor.
  • the processor 1110 is configured to determine a PSFCH frequency-domain mapping rule; map the PSFCH sequence to the second symbol used to send the PSFCH sequence according to the frequency-domain mapping rule;
  • the frequency domain mapping rule includes at least one of the following:
  • the frequency domain mapping of the PSFCH is mapped from the first physical resource block of the lowest subchannel where the PSFCH is located, and the first physical resource block is the lowest subchannel after excluding the PSCCH physical resource block;
  • the frequency domain mapping of the PSFCH is mapped from the lowest physical resource block of the lowest subchannel + M where the PSFCH is located, and M is the protocol pre-definition, network pre-configuration, and network configuration , network indication, terminal pre-configuration, terminal configuration or terminal indication value;
  • the frequency domain mapping of the PSFCH starts from the lowest physical resource block of the lowest subchannel where the PSFCH is located.
  • At least one of the DMRS pattern, number of ports and number of layers of the first DMRS is predefined by protocol, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration or terminal indication.
  • the generation of the sequence of the first DMRS satisfies at least one of the following:
  • the sequence of the first DMRS is related to a reference signal sequence or an orthogonal sequence.
  • the first pattern is an LTE PSSCH DMRS pattern.
  • the time-frequency domain mapping of the sequence of the first DMRS satisfies at least one of the following:
  • the time domain is mapped to the 2nd and 5th symbols of the first slot of the subframe and the 1st and 4th symbols of the second slot;
  • the frequency domain is mapped on the same frequency domain extent as the data channel.
  • the embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, each embodiment of the transmission method of the above-mentioned physical sidelink feedback channel is realized. process, and can achieve the same technical effect, in order to avoid repetition, it will not be repeated here.
  • the processor is the processor in the terminal described in the foregoing embodiments.
  • the readable storage medium includes computer readable storage medium, such as computer read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.
  • the embodiment of the present application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to realize the above-mentioned physical sidelink feedback channel
  • the chip includes a processor and a communication interface
  • the communication interface is coupled to the processor
  • the processor is used to run programs or instructions to realize the above-mentioned physical sidelink feedback channel
  • the chip mentioned in the embodiment of the present application may also be called a system-on-chip, a system-on-chip, a system-on-a-chip, or a system-on-a-chip.
  • the term “comprising”, “comprising” or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase “comprising a " does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element.
  • the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions are performed, for example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
  • the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation.
  • the technical solution of the present application can be embodied in the form of computer software products, which are stored in a storage medium (such as ROM/RAM, magnetic disk, etc.) , CD-ROM), including several instructions to make a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods described in the various embodiments of the present application.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente demande concerne le domaine technique des communications sans fil, et concerne un procédé et un dispositif de transmission d'un canal de rétroaction de liaison latérale physique (PSFCH). Le procédé de transmission du PSFCH dans des modes de réalisation de la présente demande comprend les étapes suivantes : un terminal envoie ou reçoit un PSFCH, le terminal envoyant et/ou recevant l'ensemble ou une partie des symboles dans un motif DMRS d'un premier DMRS sur un premier symbole, et le premier symbole étant utilisé pour une commande de gain automatique du PSFCH.
PCT/CN2022/121731 2021-09-29 2022-09-27 Procédé et dispositif de transmission d'un canal de rétroaction de liaison latérale physique Ceased WO2023051524A1 (fr)

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