Transmission method and device of physical sidelink feedback channel

Abstract

The application discloses a physical sidelink feedback channel transmission method and device, and belongs to the technical field of wireless communication. The physical sidelink feedback channel transmission method comprises the following steps: a terminal transmits or receives a PSFCH, wherein the terminal transmits and / or receives all or part of symbols in a DMRS pattern of a first DMRS on a first symbol, and the first symbol is used for automatic gain control of the PSFCH.

Description

Technical Field

[0001] This application belongs to the field of wireless communication technology, specifically relating to a transmission method and apparatus for a physical sidelink feedback channel. Background Technology

[0002] Long Term Evolution (LTE) systems support sidelink transmission, used for direct data transmission between User Equipment (UE) devices without network equipment. LTE sidelink communication is broadcast-based, and while it can support basic safety-related communications in vehicle-to-everything (V2X) networks, it is not suitable for more advanced V2X services. 5G New Radio (NR) systems will support more advanced sidelink transmission designs, such as unicast, multicast, or multicast, thus enabling support for a wider range of service types.

[0003] Currently, dedicated frequency bands have been allocated for LTE Sidelink communication. However, due to significant design differences between LTE Sidelink UEs and NR Sidelink UEs, current NR Sidelink UEs cannot directly access these frequency bands for communication. With the number of NR Sidelink UEs increasing and the number of LTE Sidelink UEs decreasing, the utilization rate of the frequency bands allocated to LTE Sidelink UEs is low. Therefore, methods need to be designed to allow NR Sidelink UEs to coexist with LTE Sidelink UEs on these frequency bands.

[0004] The design method of the demodulation reference signal (DMRS) of the LTE Sidelink Physical Sidelink Shared Channel (PSSCH) is different from that of the NR Sidelink PSSCH DMRS. When the NR terminal is operating in the coexisting frequency band, in order for the LTE terminal to exclude the resources occupied by the NR terminal, the LTE terminal needs to measure the NR terminal's DMRS to obtain the reference signal receiving power (RSRP) value and then select resources. Therefore, a new design is required for the NR terminal's PSSCH DMRS.

[0005] In addition, LTE Sidelink does not support retransmissions based on Hybrid Automatic Repeat Request (HARQ) feedback, but only supports one blind retransmission to enhance reliability. This design mechanism lacks flexibility and generates redundant transmissions when system congestion is low, while a single retransmission may not achieve the required reliability when system congestion is high. When an LTE UE performs RSRP measurement, it measures the RSRP corresponding to the LTE DMRS pattern (e.g., symbols 2, 5, 8, 11). To measure the RSRP of an NR terminal, the NR terminal can enable the LTE PSSCH DMRS pattern. In Release 16, the NR terminal supports the HARQ feedback mechanism. In coexisting frequency bands, if the NR terminal enables HARQ feedback, the design of the LTE PSSCH DMRS pattern does not consider the transmission of the Physical Sidelink Feedback Channel (PSFCH). This causes a conflict between the symbols used for Automatic Gain Control (AGC) in the PSFCH transmission (e.g., the first repeating symbol, or the symbol corresponding to startSLsymbols + lengthSLsymbols – 3) and the DMRS symbol positions in the LTE PSSCH DMRS pattern when the NR terminal uses the LTE PSSCH DMRS pattern. Therefore, it is necessary to consider how to design the PSFCH to enable HARQ feedback when the NR terminal is operating in the coexisting frequency band, thereby enhancing the transmission reliability of the NR terminal. Summary of the Invention

[0006] This application provides a method and apparatus for transmitting a physical sidelink feedback channel, which can solve the problem of how to design the PSFCH so that the NR terminal can enable HARQ feedback when the NR terminal is operating in a coexisting frequency band, thereby enhancing the transmission reliability of the NR terminal.

[0007] Firstly, a transmission method for a physical side-link feedback channel is provided, including:

[0008] The terminal transmits or receives PSFCH, wherein the terminal transmits and / or receives all or part of the symbols in the DMRS pattern of the first DMRS on the first symbol, the first symbol being used for automatic gain control of the PSFCH.

[0009] Secondly, a transmission device for a physical sidelink feedback channel is provided, comprising:

[0010] A transmission module for transmitting or receiving PSFCH, wherein all or part of the symbols in the DMRS pattern of a first DMRS are transmitted and / or received on a first symbol, the first symbol being used for automatic gain control of the PSFCH.

[0011] Thirdly, a terminal is provided, the terminal including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the method described in the first aspect.

[0012] Fourthly, a terminal is provided, including a processor and a communication interface, wherein the communication interface is used to transmit or receive PSFCH, wherein all or part of the symbols in the DMRS pattern of a first DMRS are transmitted and / or received on a first symbol, the first symbol being used for automatic gain control of the PSFCH.

[0013] Fifthly, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect.

[0014] In a sixth aspect, a chip is provided, the chip including a processor and a communication interface coupled to the processor, the processor being used to run programs or instructions to implement the method as described in the first aspect.

[0015] In a seventh aspect, a computer program / program product is provided, the computer program / program product being stored in a non-volatile storage medium, the program / program product being executed by at least one processor to implement the steps of the method as described in the first aspect.

[0016] In this embodiment of the application, when the terminal transmits PSFCH, all or part of the symbols of the DMRS pattern are transmitted using one symbol for automatic gain control of PSFCH, so that the transmission of the DMRS pattern is not affected when the symbol positions of the DMRS pattern and PSFCH conflict. In addition, PSFCH enables the NR terminal to enable HARQ feedback, thereby enhancing the reliability of terminal transmission. Attached Figure Description

[0017] Figure 1 This is a block diagram of a wireless communication system applicable to embodiments of this application;

[0018] Figure 2 This is a schematic diagram of the LTE sidelink detection method;

[0019] Figure 3 This is a flowchart illustrating the transmission method of the physical sidelink feedback channel according to an embodiment of this application.

[0020] Figure 4 This is a schematic diagram of the SA mapping rule for case 1;

[0021] Figure 5 This is a schematic diagram of the SA mapping rule for case 2;

[0022] Figure 6 This is a schematic diagram of the transmission method of the physical side-link feedback channel in Embodiment 1 of this application;

[0023] Figure 7 This is a schematic diagram of the transmission method of the physical side-link feedback channel in Embodiment 2 of this application;

[0024] Figure 8 This is a schematic diagram of the transmission method of the physical side-link feedback channel in Embodiment 3 of this application;

[0025] Figure 9 This is a schematic diagram of the transmission device for the physical side-link feedback channel according to an embodiment of this application;

[0026] Figure 10 This is a schematic diagram of the terminal structure according to an embodiment of this application;

[0027] Figure 11 This is a schematic diagram of the hardware structure of the terminal according to an embodiment of this application. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0029] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0030] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and the term NR is used in most of the following description; however, these technologies can also be applied to applications other than NR systems, such as 6th generation (6G) radio systems. th Generation 6G communication system.

[0031] Figure 1This diagram illustrates a block diagram of a wireless communication system applicable to embodiments of this application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can also be referred to as a terminal device or user equipment (UE). The terminal 11 can be a mobile phone, tablet computer, laptop computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), wearable device, vehicle-mounted device (VUE), pedestrian terminal (PUE), etc. Wearable devices include smartwatches, wristbands, headphones, glasses, etc. It should be noted that this application does not limit the specific type of terminal 11. Network-side device 12 can be a base station or a core network. The base station can be referred to as a node B, evolved node B, access point, base transceiver station (BTS), radio base station, radio transceiver, basic service set (BSS), extended service set (ESS), B node, evolved B node (eNB), home B node, home evolved B node, WLAN access point, WiFi node, transmitting and receiving point (TRP), or any 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 this application embodiment, only the base station in the NR system is used as an example, but the specific type of base station is not limited.

[0032] The transmission method and apparatus for the physical side-link feedback channel provided in this application will be described in detail below with reference to the accompanying drawings and through some embodiments and application scenarios.

[0033] The following is a brief introduction to the relevant technologies.

[0034] 1. Detection in LTE Sidelink (SL)

[0035] In LTE sidelinks (SL), resource selection requires sensing. Please refer to [link / reference needed]. Figure 2The basic working principle is as follows: Measurements are performed within the sensing window, and scheduling assignment (SA) and interference measurements are performed within each transmission time interval (TTI). The UE selects resources according to the following steps:

[0036] 1) Exclude resources from which the UE can transmit data.

[0037] 2) The terminal demodulates the SA received, obtains the reserved resources of other UEs, and excludes the reserved resources of other UEs.

[0038] 3) Perform energy detection within the sensing window, measure the reference signal strength indication (RSSI), and eliminate resources with high interference based on the measurement results.

[0039] 4) Within the selection window, randomly select a subframe from the 20% of resources with the least interference for periodic resource reservation.

[0040] 2. Random selection in side links (SL)

[0041] If the user makes a random selection, the resource will be randomly selected within the selection window without needing to perform a sensing.

[0042] 3. Sensing in NR SL (Normally In-Line)

[0043] In Mode 2 resource allocation, resource selection based on sensing is supported. Its principle is similar to the sensing mechanism in LTE SLmode 4. The specific operation is as follows:

[0044] 1) After resource selection is triggered, the TX UE (transmitter UE) determines the resource selection window.

[0045] 2) Before selecting resources, the UE needs to determine the candidate resource set. The RSRP measured on the resources in the resource selection window is compared with the corresponding RSRP threshold. If the RSRP is lower than the RSRP threshold, then the resource can be included in the candidate resource set.

[0046] 3) After the resource set is determined, the UE randomly selects transmission resources from the candidate resource set. In addition, the UE can reserve transmission resources for subsequent transmissions during this transmission.

[0047] In Rel-16 NR SL, TX UEs reserve their allocated resources (reservation is divided into periodic reservation and aperiodic reservation). Reserved resources are used for future Physical Sidelink Control Channel (PSCCH) / Physical Sidelink Shared Channel (PSSCH) transmissions. Aperiodic reservation is implemented through the Time resource assignment field in the Sidelink Control Information (SCI), and the reserved resources can be used for at least the same Transport Block (TB). Periodic reservation is implemented through the Resource reservation period field in the SCI, and the periodically reserved resources in the current period can be used for the transmission of the next TB.

[0048] 4. NR's physical sidelink feedback channel

[0049] The UE transmits Physical Sidelink Feedback Channels (PSFCHs) carrying HARQ-ACK information on one or more sub-channels. In response to PSSCH reception, the transmitted HARQ-ACK information is either ACK, NACK, or NACK only. The UE obtains the PSSCH resource period through periodPSFCHresource, with a value N = 0 / 1 / 2 / 4 slots. When this parameter is 0, the UE does not transmit PSSCH.

[0050] The position l′ of the second OFDM symbol in the time slot of PSFCH is: l′=startSLsymbols+lengthSLsymbols–2, and the content carried by the first OFDM symbol is a repetition of the second OFDM symbol.

[0051] In this application embodiment, the event unit is mainly described using the slot in NR, but the time unit is not limited to slot.

[0052] Please refer to Figure 3 This application provides a method for transmitting a physical sidelink feedback channel, including:

[0053] 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, the first symbol being used for automatic gain control of PSFCH.

[0054] In this embodiment of the application, the terminal sends and / or receives all or part of the symbols in the DMRS pattern of the first DMRS on a first symbol of a preset time unit. The preset time unit may be a symbol, time slot, subframe, frame, millisecond, second, number of times, etc.

[0055] In this embodiment, when the terminal transmits PSFCH, all or part of the symbols of the DMRS pattern are transmitted using one symbol for automatic gain control of PSFCH. This ensures that the transmission of the DMRS pattern is not affected even when the symbol positions of the DMRS pattern and PSFCH conflict. In addition, PSFCH enables the NR terminal to enable HARQ feedback, thereby enhancing the reliability of terminal transmission.

[0056] In this embodiment of the application, optionally, the position of the first symbol includes at least one of the following:

[0057] 1) The first symbol of PSFCH;

[0058] In this case, the first SLsymbols + lengthSLsymbols – 2th symbol corresponding to NR is the second symbol of PSFCH. At this point, the second symbol of PSFCH is the symbol containing the PSFCH sequence (called the PSFCH sequence symbol).

[0059] In related technologies, two symbols are used for automatic gain control of PSFCH, where the first symbol is a repetition of the second symbol.

[0060] In this embodiment, the information transmitted on the first symbol of the two symbols used for automatic gain control of the PSFCH is no longer a repetition of the information transmitted on the second symbol. The second symbol still maps to the PSFCH sequence, while the first symbol is used to transmit all or part of the symbols in the DMRS pattern of the first DMRS.

[0061] Although the information transmitted by the first symbol is no longer a repetition of the information transmitted by the second symbol, the receiving power of the second symbol can still be adjusted based on the receiving power of the first symbol, so that HARQ feedback can be transmitted and received normally.

[0062] At the same time, since the DMRS symbol transmitted in 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 LTESidelink PSSCH DMRS format, thus achieving backward compatibility with LTE.

[0063] 2) The symbol preceding PSFCH;

[0064] In this case, the first symbol of the PSFCH is the first symbol of the NR, corresponding to the first symbol of the NR (startSLsymbols + lengthSLsymbols – 2). The PSFCH sequence is mapped to the first symbol of the PSFCH; that is, at this time, the PSFCH has only one symbol, carrying the PSFCH sequence. Therefore, when the terminal sends the PSFCH, it will simultaneously send the first symbol.

[0065] 3) The Xth symbol, X = startSLsymbols + lengthSLsymbols – Z, where startSLsymbols is the starting symbol position of the sidelink, lengthSLsymbols is the symbol length of the sidelink, and Z is a value of protocol predefined, network preconfigured, network configured, network indicated, terminal preconfigured, terminal configured, or terminal indicated. Optionally, the value of Z can be 3.

[0066] In this embodiment of the application, optionally, the first symbol is a repetition of the Y-th symbol, where Y = the position of the first symbol + L, and L is a value of protocol predefinition, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication. For example, L can be -3.

[0067] In this embodiment of the application, optionally, the DMRS pattern of the first DMRS is at least one of the following:

[0068] LTE sidelink PSSCH DMRS diagram;

[0069] LTE sidelink PSCCH DMRS diagram;

[0070] LTE sidelink physical sidelink broadcast channel (PSBCH) DMRS diagram;

[0071] LTE sidelink physical sidelink discovery channel (PSDCH) DMRS diagram;

[0072] NR side link PSSCH DMRS diagram x;

[0073] NR sidelink PSCCH DMRS diagram x;

[0074] NR side link PSBCH DMRS diagram x;

[0075] NR sidelink PSFCH DMRS diagram x;

[0076] DMRS diagrams for protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration, or terminal indication;

[0077] Among them, DMRS pattern x is a DMRS pattern for protocol predefinition, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration or terminal indication.

[0078] In this embodiment of the application, optionally, the symbol transmitted and / or received on the first symbol is the Nth symbol in the DMRS pattern of the first DMRS, where N is a value of protocol predefined, network preconfigured, network configured, network indicated, terminal preconfigured, terminal configured, or terminal indicated. Further optionally, N = 4, which can be the last symbol in the DMRS pattern of the first DMRS.

[0079] In this embodiment, the first symbol is used for automatic gain control of PSFCH. Since the first symbol carries different content from the symbol in which the PSFCH sequence is located, the automatic gain control based on the first symbol cannot be perfectly applied to the symbol in which the PSFCH sequence is located. Therefore, the power difference between the two symbols needs to be considered when transmitting, which will be explained in detail below.

[0080] In this embodiment of the application, optionally, the terminal transmitting all or part of the symbols in the DMRS pattern of the first DMRS on the first symbol includes:

[0081] The terminal determines the transmission power of the first symbol, wherein the transmission power of the first symbol satisfies at least one of the following:

[0082] 1) The transmission power of the first symbol is the same as the transmission power of other DMRS symbols within the DMRS pattern of the first DMRS;

[0083] At this time, when 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 (i.e. the first symbol). This is suitable for terminals that transmit data and feedback at the same time. However, the receiver needs to consider the difference in transmission power between the two symbols when performing automatic gain control of PSFCH.

[0084] 2) The transmission power of the first symbol is the same as the transmission power of the second symbol used to transmit the PSFCH sequence;

[0085] This method has low requirements for the transmitting end, but the receiving end needs to take into account the difference in transmission power between the two symbols when using automatic gain control.

[0086] 3) The transmission power of the first symbol is determined based on the transmission power of the second symbol used to transmit the PSFCH sequence and the power control factor;

[0087] Optionally, the transmission power of the first symbol is calculated based on the transmission 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 receiver is the same. In this way, the reception of the PSFCH sequence symbol can be adjusted according to the normal automatic gain control procedure.

[0088] In this embodiment of the application, optionally, the power control factor is calculated and determined based on the energy of the first symbol and the energy of the second symbol used to transmit the PSFCH sequence.

[0089] In this embodiment of the application, optionally, the power control factor is defined by protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration, or terminal indication.

[0090] In this embodiment of the application, optionally, the power control factor is notified to the receiving terminal by the transmitting terminal.

[0091] At this point, the receiver can use the received power control factor to help determine the PSFCH power and / or automatic gain control.

[0092] 4) The transmission power of the first symbol is equal to the average power of the other symbols in the time slot;

[0093] 5) The transmission power of the first symbol is equal to the fixed power, which is determined by protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration, or terminal indication.

[0094] 6) The transmission power of the first symbol is equal to the maximum transmission power, which is determined by protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration, or terminal indication.

[0095] In this embodiment of the application, optionally, the terminal receiving the PSFCH includes:

[0096] The terminal determines the PSFCH power and / or automatic gain control based on the received power of the first symbol, wherein:

[0097] a) The PSFCH power and / or automatic gain control is calculated and determined based on the received power of the first symbol and the power control factor;

[0098] This situation corresponds to the following situations: 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; and the first symbol uses a fixed power or maximum transmission power.

[0099] In this embodiment of the application, optionally, the power control factor is calculated and determined based on the energy of the first symbol and the energy of the second symbol used to transmit the PSFCH sequence.

[0100] In this embodiment of the application, since the PSFCH sequence energy is not fixed, the power control factor may be a preset value. Therefore, the power control factor may be a protocol predefined, network preconfigured, network configured, network indicated, terminal preconfigured, terminal configured, or terminal indicated.

[0101] In this embodiment of the application, optionally, the power control factor is notified to the receiving terminal by the transmitting terminal.

[0102] or

[0103] b) The PSFCH power and / or automatic gain control are determined directly based on the received power of the first symbol.

[0104] In this case, the power adjustment has already been handled at the transmitting end, so the received power of the two symbols can be considered to be the same.

[0105] In this embodiment of the application, optionally, the transmission method of the physical sidelink feedback channel further includes: when the terminal performs resource detection, determining a first signal quality parameter based on at least one of the following, wherein the first signal quality parameter includes Reference Received Power (RSRP) and / or Received Signal Strength Indication (RSSI):

[0106] Based on the first M symbols of the received first DMRS pattern, a first signal quality parameter is determined, where M is determined by protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration, or terminal indication; for example, M=3. That is, the fourth symbol is not considered (the fourth symbol (i.e., the first symbol) is used for automatic gain control, and its transmit power may be different from the first three).

[0107] The first signal quality parameter is determined based on the measured first signal quality parameter of PSSCH and the preset scaling factor.

[0108] Optionally, the preset scaling factor can be defined by protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration, or terminal indication.

[0109] The frequency domain mapping rules of the physical sidelink feedback channel in the transmission method of the physical sidelink feedback channel in the embodiments of this application will be described below.

[0110] First, the relevant technologies will be explained.

[0111] 1. The LTE PSCCH_SCI format 1 consists of the indicator fields shown in Table 1 below:

[0112] Table 1

[0113]

[0114] In LTE Sidelink, the PSCCH (also known as SA) and PSSCH are transmitted in the same subframe, and their frequency domains can be continuous or discontinuous, falling into two categories: Figure 4 and Figure 5 As shown.

[0115] Case 1: Reference Figure 4 SA starts mapping from the lowest frequency domain position in the lowest subchannel of the resource selected for data transmission, occupying two physical resource blocks (PRBs).

[0116] Scenario 2: Reference Figure 5 The SA is mapped starting from the frequency domain position in the SA resource pool corresponding to the lowest subchannel of the resource selected for data transmission, occupying two PRBs.

[0117] 2. DMRS for LTE sidelinks

[0118] LTE Sidelink's DMRS is generated based on the LTE Physical Uplink Shared Channel (PUSCH) DMRS:

[0119] PUSCH DMRS sequence Generate according to the following formula:

[0120]

[0121] Where λ is the layer number, u is the group number, v is the base sequence number within the group, and α λ It is the cyclic shift value, δ = 0, w (λ) (m) is an orthogonal sequence, It is a reference signal sequence. It is bandwidth, measured in subcarriers, and satisfies the following conditions:

[0122]

[0123]

[0124] Circular shift α λ Satisfy α λ =2πn cs，λ / 12,n cs，λ It is an intermediate value in the cyclic shift.

[0125] PUSCH DMRS precoded as:

[0126]

[0127] Where p is the number of ports, and when there is only one port, W = 1 and the number of layers υ = 1.

[0128] PSCCH / PSSCH DMRS generation is based on the generation of LTE PUSCH (Physical Uplink Shared Channel) DMRS, and is based on the following settings:

[0129] 1) The number of ports is 1.

[0130] 2) The mapping rule should use the following values ​​for 1 in RE(k, 1): the first time slot of the subframe uses l=2 and l=5, and the second time slot uses l=1 and l=4.

[0131] 3) k follows an increasing order, for all values.

[0132] 4) Intermediate quantities m = 0, 1, 2, 3 for PSSCH.

[0133] 5) Parameters in Tables 2 and 3.

[0134] Table 2 Reference Channel Parameters for PSSCH

[0135]

[0136] Table 3 Reference signal parameters for PSCCH

[0137]

[0138] When an NR terminal operates in a coexisting frequency band, the PSCCH containing the LTE control information SCI format 1 has two possibilities in the frequency domain, as mentioned above. One is that the PSCCH is located in a specific PSCCH resource pool, in which case it is separated from the corresponding PSSCH frequency domain; the other is that the PSCCH is located in the lowest subchannel of the PSSCH and occupies the two lowest PRBs in its frequency domain. Therefore, the PSFCH mapping rules need to consider these two different situations.

[0139] In this embodiment of the application, the optional transmission method for the physical sidelink feedback channel further includes:

[0140] The terminal determines the frequency domain mapping rules of the PSFCH;

[0141] The terminal maps the PSFCH sequence to the second symbol used for transmitting the PSFCH sequence according to the frequency domain mapping rule;

[0142] The frequency domain mapping rule includes at least one of the following:

[0143] When the frequency domain position of the PSCCH is adjacent to that of its scheduled PSSCH, the frequency domain mapping of the PSFCH starts from the first physical resource block of the lowest sub-channel where the PSFCH is located. The first physical resource block is the lowest physical resource block excluding the PSCCH.

[0144] When the frequency domain position of the PSCCH is adjacent to that of its scheduled PSSCH, the frequency domain mapping of the PSFCH starts from the lowest physical resource block + M of the lowest sub-channel where the PSFCH is located, where M is a value of protocol predefined, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication; for example, M = 2, because the PSCCH occupies the lowest two PRBs of the sub-channel.

[0145] When the frequency domain positions of the PSCCH and its scheduled PSSCH are not adjacent, the frequency domain mapping of the PSFCH starts from the lowest physical resource block of the lowest sub-channel where the PSFCH is located.

[0146] Whether the frequency domain positions of the aforementioned PSCCH and its scheduled PSSCH are adjacent or not adjacent is determined by protocol predefinition, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication.

[0147] When an LTE UE performs RSRP measurement, it measures the RSRP corresponding to the LTE DMRS pattern (e.g., symbols 2, 5, 8, 11). To measure the RSRP of an NR terminal, the NR terminal can enable the LTE PSSCH DMRS pattern.

[0148] In this embodiment of the application, optionally, at least one of the DMRS pattern, number of ports, and number of layers of the first DMRS is predefined by a protocol, preconfigured by a network, configured by a network, indicated by a network, preconfigured by a terminal, configured by a terminal, or indicated by a terminal. For example, it may be indicated by control information SCI.

[0149] In this embodiment of the application, optionally, when the DMRS pattern of the first DMRS is the first pattern, the generation of the sequence of the first DMRS satisfies at least one of the following:

[0150] The sequence of the first DMRS is generated by reusing the generation method of the LTE sidelink DMRS (i.e., reusing the LTE SidelinkDMRS pattern, backward compatible with LTE);

[0151] The sequence of the first DMRS is related to a reference signal sequence or an orthogonal sequence (defined with the same process and parameters as LTE SidelinkDMRS generation), for example...

[0152] a) Group frequency hopping related parameters, sequence frequency hopping related parameters, cyclic shift related parameters, orthogonal sequence related parameters and / or sequence length are shown in Table 1.

[0153] b) The number of layers and / or ports is 1.

[0154] In this embodiment of the application, optionally, the first pattern is an LTE PSSCH DMRS pattern.

[0155] In this embodiment of the application, optionally, when the DMRS pattern of the first DMRS is the first pattern, the time-frequency domain mapping of the sequence of the first DMRS satisfies at least one of the following:

[0156] 1) The 2nd, 5th, 8th, and 11th symbols mapped in the time slot in the time domain;

[0157] In LTE, descriptions are based on subframes; here, following the description in NR, descriptions are based on time slots, all starting with 0.

[0158] 2) The temporal mapping is performed on symbols 2 and 5 of the first time slot and symbols 1 and 4 of the second time slot in the subframe;

[0159] This section reuses the LTE description, which is described in units of subframes, all starting with 0.

[0160] 3) The frequency domain is mapped to the same frequency domain range as the data channel.

[0161] The transmission method of the physical sidelink feedback channel in this application embodiment will be described below in conjunction with a specific application scenario.

[0162] Embodiment 1 of this application: PSFCH structure 1

[0163] like Figure 6 As shown, the symbol positions of LTE Sidelink DMRS are l = 2, 5, 8, 11, while in NR Sidelink, the PSFCH channel occupies the last two symbols of the time slot excluding GP (Guard Interval), and in related technologies, the first symbol is a repetition of the second symbol, used for AGC (Automatic Gain Control) power control.

[0164] In order to enable NR terminals to transmit both PSFCH and DMRS according to the LTE DMRS pattern, and thus allow LTE terminals to obtain accurate RSRP by measuring the DMRS transmitted by NR terminals, the first symbol of PSFCH (i.e., the first symbol) can be changed to the last symbol of DMRS transmission. This way, the terminal can still perform AGC through the first symbol, while making the DMRS pattern on the NR terminal side backward compatible with LTE.

[0165] Embodiment 2 of this application: PSFCH structure 2

[0166] like Figure 7 As shown, the terminal will still send the 11th and 12th symbols (starting from 0) when the PSFCH feedback is received. The 11th symbol carries the DMRS, while the 12th symbol maps to the PSFCH sequence. However, in this embodiment, only the 12th symbol carrying the PSFCH sequence is referred to as the PSFCH channel.

[0167] Embodiment 3 of this application: PSFCH frequency domain location

[0168] In this embodiment of the application, when the protocol is predefined, the network is preconfigured, the network is configured, or RRC, DCI, SA indicate that the PSCCH channel and the PSSCH channel are adjacent in the frequency domain, because the lowest two PRBs in the frequency domain of the subchannel are used to carry control information SCI format 1, such as... Figure 8 As shown, the frequency domain mapping of PSFCH needs to start from the lowest PRB after excluding the two lowest PRBs in the lowest subchannel.

[0169] When the PSCCH channel and the PSSCH channel are separated in the frequency domain (not adjacent), the frequency domain mapping of the PSFCH starts from the lowest PRB of the lowest subchannel.

[0170] In the above embodiments, under the background of co-frequency coexistence, the NR terminal reuses the DMRS pattern of the LTE Sidelink, allowing the LTE terminal to select resources by measuring the NR terminal's DMRS and excluding the NR terminal's reserved resources. Simultaneously, based on reusing the LTE Sidelink's DMRS pattern, the PSFCH structure is redesigned so that the NR terminal's PSFCH transmission does not affect the DMRS structure. Furthermore, the transmitting and receiving ends determine the transmission power and reception actions based on the new PSFCH structure, ensuring correct PSFCH reception. Because the NR terminal transmits the PSFCH, it can determine whether to retransmit based on HARQ feedback information, ensuring transmission reliability.

[0171] It should be noted that the physical sidelink feedback channel transmission method provided in this application embodiment can be executed by a physical sidelink feedback channel transmission device, or by a control module within that physical sidelink feedback channel transmission device for executing the physical sidelink feedback channel transmission method. This application embodiment uses the execution of the physical sidelink feedback channel transmission method by a physical sidelink feedback channel transmission device as an example to illustrate the physical sidelink feedback channel transmission device provided in this application embodiment.

[0172] Please refer to Figure 9 This application embodiment also provides a transmission device 90 for a physical sidelink feedback channel, comprising:

[0173] The transmission module 91 is used to transmit or receive PSFCH, wherein it transmits and / or receives all or part of the symbols in the DMRS pattern of the first DMRS on a first symbol, the first symbol being used for automatic gain control of the PSFCH.

[0174] In this embodiment, when the terminal transmits PSFCH, all or part of the symbols of the DMRS pattern are transmitted using one symbol for automatic gain control of PSFCH. This ensures that the transmission of the DMRS pattern is not affected even when the symbol positions of the DMRS pattern and PSFCH conflict. In addition, PSFCH enables the NR terminal to enable HARQ feedback, thereby enhancing the reliability of terminal transmission.

[0175] In this embodiment of the application, optionally, the position of the first symbol includes at least one of the following:

[0176] The first symbol of PSFCH;

[0177] The symbol preceding PSFCH;

[0178] The Xth symbol, X = startSLsymbols + lengthSLsymbols – Z, where startSLsymbols is the starting symbol position of the side link, lengthSLsymbols is the symbol length of the side link, and Z is the value of protocol predefined, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication.

[0179] In this embodiment of the application, optionally, the DMRS pattern of the first DMRS is at least one of the following:

[0180] LTE sidelink PSSCH DMRS diagram;

[0181] LTE sidelink PSCCH DMRS diagram;

[0182] LTE sidelink PSBCH DMRS diagram;

[0183] LTE sidelink PSDCH DMRS diagram;

[0184] NR side link PSSCH DMRS diagram x;

[0185] NR sidelink PSCCH DMRS diagram x;

[0186] NR side link PSBCH DMRS diagram x;

[0187] NR sidelink PSFCH DMRS diagram x;

[0188] DMRS diagrams for protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration, or terminal indication;

[0189] Among them, DMRS pattern x is a DMRS pattern for protocol predefinition, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration or terminal indication.

[0190] In this embodiment of the application, optionally, the symbol transmitted and / or received on the first symbol is the Nth symbol in the DMRS pattern of the first DMRS, where N is a value of protocol predefined, network preconfigured, network configured, network indicated, terminal preconfigured, terminal configured, or terminal indicated.

[0191] In this embodiment of the application, optionally, the transmission module 91 includes:

[0192] A first determining submodule is configured to determine the transmission power of the first symbol, wherein the transmission power of the first symbol satisfies at least one of the following:

[0193] The transmission power of the first symbol is the same as the transmission power of other DMRS symbols within the DMRS pattern of the first DMRS;

[0194] The transmission power of the first symbol is the same as the transmission power of the second symbol used to transmit the PSFCH sequence;

[0195] The transmission power of the first symbol is calculated based on the transmission power of the second symbol used to transmit the PSFCH sequence and a power control factor;

[0196] The transmission power of the first symbol is equal to the average power of the other symbols in the time slot;

[0197] The transmission power of the first symbol is equal to a fixed power, which is determined by protocol predefinition, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication.

[0198] The transmission power of the first symbol is equal to the maximum transmission power, which is determined by protocol predefinition, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication.

[0199] In this embodiment of the application, optionally, the transmission module 91 includes:

[0200] The second determining submodule is used to determine the PSFCH power and / or automatic gain control based on the received power of the first symbol, wherein:

[0201] The PSFCH power and / or automatic gain control is calculated and determined based on the received power of the first symbol and the power control factor;

[0202] or

[0203] The PSFCH power and / or automatic gain control are determined directly based on the received power of the first symbol.

[0204] In this embodiment of the application, optionally, the transmission transpose 90 of the physical sidelink feedback channel further includes:

[0205] A first determining module is configured to determine a first signal quality parameter based on at least one of the following during resource detection: the first signal quality parameter includes RSRP and / or RSSI:

[0206] Based on the first M symbols of the DMRS pattern of the received first DMRS, the first signal quality parameter is determined, where M is defined by protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration, or terminal indication.

[0207] The first signal quality parameter is determined based on the measured first signal quality parameter of PSSCH and the preset scaling factor.

[0208] In this embodiment of the application, optionally, the transmission transpose 90 of the physical sidelink feedback channel further includes:

[0209] The second determining module is used to determine the frequency domain mapping rules of the PSFCH;

[0210] The mapping module is used to map the PSFCH sequence to a second symbol for transmitting the PSFCH sequence according to the frequency domain mapping rule;

[0211] The frequency domain mapping rule includes at least one of the following:

[0212] When the frequency domain position of the PSCCH is adjacent to that of its scheduled PSSCH, the frequency domain mapping of the PSFCH starts from the first physical resource block of the lowest sub-channel where the PSFCH is located. The first physical resource block is the lowest physical resource block excluding the PSCCH.

[0213] When the frequency domain position of the PSCCH is adjacent to that of its scheduled PSSCH, the frequency domain mapping of the PSFCH starts from the lowest physical resource block + M of the lowest sub-channel where the PSFCH is located, where M is the value of protocol predefined, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration or terminal indication.

[0214] When the frequency domain positions of the PSCCH and its scheduled PSSCH are not adjacent, the frequency domain mapping of the PSFCH starts from the lowest physical resource block of the lowest sub-channel where the PSFCH is located.

[0215] In this embodiment of the application, optionally, at least one of the DMRS pattern, number of ports, and number of layers of the first DMRS is predefined by the protocol, preconfigured by the network, configured by the network, indicated by the network, preconfigured by the terminal, configured by the terminal, or indicated by the terminal.

[0216] In this embodiment of the application, optionally, when the DMRS pattern of the first DMRS is the first pattern, the generation of the sequence of the first DMRS satisfies at least one of the following:

[0217] The sequence of the first DMRS is generated by reusing the generation method of the LTE sidelink DMRS;

[0218] The sequence of the first DMRS is related to the reference signal sequence or the orthogonal sequence.

[0219] In this embodiment of the application, optionally, when the DMRS pattern of the first DMRS is the first pattern, the time-frequency domain mapping of the sequence of the first DMRS satisfies at least one of the following:

[0220] The 2nd, 5th, 8th, and 11th symbols mapped to the time slot in the time domain;

[0221] The temporal mapping is performed on symbols 2 and 5 of the first time slot and symbols 1 and 4 of the second time slot of the subframe;

[0222] The frequency domain is mapped to the same frequency domain range as the data channel.

[0223] The transmission device for the physical sidelink feedback channel in this application embodiment can be a device, a device or electronic device with an operating system, or a component, integrated circuit, or chip in a terminal. This device or electronic device can be a mobile terminal or a non-mobile terminal. For example, a mobile terminal can include, but is not limited to, the types of terminal 11 listed above, while a non-mobile terminal can be a server, network attached storage (NAS), personal computer (PC), television (TV), ATM, or self-service machine, etc. This application embodiment does not impose specific limitations.

[0224] The transmission device for the physical sidelink feedback channel provided in this application embodiment can achieve Figure 3 The various processes implemented in the method embodiments achieve the same technical effect, and will not be described again here to avoid repetition.

[0225] like Figure 10 As shown, this application embodiment also provides a terminal 100, including a processor 101, a memory 102, and a program or instructions stored in the memory 102 and executable on the processor 101. When the program or instructions are executed by the processor 101, they implement the various processes of the above-described physical side-link feedback channel transmission method embodiment and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0226] This application embodiment also provides a terminal, including a processor and a communication interface. The communication interface is used to transmit or receive PSFCH, wherein the terminal transmits and / or receives all or part of the symbols in the DMRS pattern of a first DMRS on a first symbol, the first symbol being used for automatic gain control of the PSFCH. This terminal embodiment corresponds to the above-described terminal-side method embodiment. All implementation processes and methods of the above method embodiments can be applied to this terminal embodiment and achieve the same technical effect. Specifically, Figure 11 A schematic diagram of the hardware structure of a terminal to implement an embodiment of this application.

[0227] The terminal 110 includes, but is not limited to, at least some of the following components: radio frequency unit 111, network module 112, audio output unit 113, input unit 114, sensor 115, display unit 116, user input unit 117, interface unit 118, memory 119, and processor 1110.

[0228] Those skilled in the art will understand that the terminal 110 may also include a power supply (such as a battery) for supplying power to various components. The power supply may be logically connected to the processor 1110 through a power management system, thereby enabling functions such as managing charging, discharging, and power consumption through the power management system. Figure 11 The terminal structure shown does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0229] It should be understood that, in this embodiment, the input unit 114 may include a graphics processing unit (GPU) 1141 and a microphone 1142. The GPU 1141 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 116 may include a display panel 1161, which 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 a touch detection device and a touch controller. Other input devices 1172 may include, but are not limited to, a physical keyboard, function keys (such as volume control buttons, power buttons, etc.), a trackball, a mouse, and a joystick, which will not be described in detail here.

[0230] In this embodiment, the radio frequency unit 111 receives downlink data from the network-side device and processes it for the processor 1110; additionally, it sends uplink data to the network-side device. Typically, 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, etc.

[0231] The memory 119 can be used to store software programs or instructions and various data. The memory 119 may primarily include a program or instruction storage area and a data storage area. The program or instruction storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 119 may include high-speed random access memory and non-volatile memory, which may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. For example, at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0232] Processor 1110 may include one or more processing units; optionally, processor 1110 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and applications or instructions, and the modem processor mainly handles wireless communication, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 1110.

[0233] The radio frequency unit 111 is used to transmit or receive PSFCH, wherein the terminal transmits and / or receives all or part of the symbols in the DMRS pattern of the first DMRS on the first symbol, the first symbol being used for automatic gain control of PSFCH.

[0234] In this embodiment, when the terminal transmits PSFCH, all or part of the symbols of the DMRS pattern are transmitted using one symbol for automatic gain control of PSFCH. This ensures that the transmission of the DMRS pattern is not affected even when the symbol positions of the DMRS pattern and PSFCH conflict. In addition, PSFCH enables the NR terminal to enable HARQ feedback, thereby enhancing the reliability of terminal transmission.

[0235] Optionally, the position of the first symbol includes at least one of the following:

[0236] The first symbol of PSFCH;

[0237] The symbol preceding PSFCH;

[0238] The Xth symbol, X = startSLsymbols + lengthSLsymbols – Z, where startSLsymbols is the starting symbol position of the side link, lengthSLsymbols is the symbol length of the side link, and Z is the value of protocol predefined, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication.

[0239] Optionally, the first symbol is a repetition of the Y-th symbol, where Y = the position of the first symbol + L, and L is the value of protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration, or terminal indication.

[0240] Optionally, the DMRS pattern of the first DMRS is at least one of the following:

[0241] LTE sidelink PSSCH DMRS diagram;

[0242] LTE sidelink PSCCH DMRS diagram;

[0243] LTE sidelink PSBCH DMRS diagram;

[0244] LTE sidelink PSDCH DMRS diagram;

[0245] NR side link PSSCH DMRS diagram x;

[0246] NR sidelink PSCCH DMRS diagram x;

[0247] NR side link PSBCH DMRS diagram x;

[0248] NR sidelink PSFCH DMRS diagram x;

[0249] DMRS diagrams for protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration, or terminal indication;

[0250] Among them, DMRS pattern x is a DMRS pattern for protocol predefinition, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration or terminal indication.

[0251] Optionally, the symbol transmitted and / or received on the first symbol is the Nth symbol in the DMRS pattern of the first DMRS, where N is a value of protocol predefined, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication.

[0252] Optional, N=4.

[0253] Optionally, the terminal transmitting all or part of the symbols in the DMRS pattern of the first DMRS on the first symbol includes:

[0254] The terminal determines the transmission power of the first symbol, wherein the transmission power of the first symbol satisfies at least one of the following:

[0255] The transmission power of the first symbol is the same as the transmission power of other DMRS symbols within the DMRS pattern of the first DMRS;

[0256] The transmission power of the first symbol is the same as the transmission power of the second symbol used to transmit the PSFCH sequence;

[0257] The transmission power of the first symbol is calculated based on the transmission power of the second symbol used to transmit the PSFCH sequence and a power control factor;

[0258] The transmission power of the first symbol is equal to the average power of the other symbols in the time slot;

[0259] The transmission power of the first symbol is equal to a fixed power, which is determined by protocol predefinition, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication.

[0260] The transmission power of the first symbol is equal to the maximum transmission power, which is determined by protocol predefinition, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication.

[0261] Optionally, receiving PSFCH includes:

[0262] The PSFCH power and / or automatic gain control are determined based on the received power of the first symbol, wherein:

[0263] The PSFCH power and / or automatic gain control is calculated and determined based on the received power of the first symbol and the power control factor;

[0264] or

[0265] The PSFCH power and / or automatic gain control are determined directly based on the received power of the first symbol.

[0266] Optionally, the power control factor is calculated and determined based on the energy of the first symbol and the energy of the second symbol used to transmit the PSFCH sequence.

[0267] Optionally, the power control factor can be predefined by a protocol, preconfigured by a network, configured by a network, indicated by a network, preconfigured by a terminal, configured by a terminal, or indicated by a terminal.

[0268] Optionally, the power control factor is notified to the receiving terminal by the transmitting terminal.

[0269] Optionally, the processor 1110 is configured to determine a first signal quality parameter based on at least one of the following when performing resource detection: the first signal quality parameter includes Reference Received Power (RSRP) and / or Received Signal Strength Indication (RSSI):

[0270] Based on the first M symbols of the DMRS pattern of the received first DMRS, the first signal quality parameter is determined, where M is defined by protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration, or terminal indication.

[0271] The first signal quality parameter is determined based on the measured first signal quality parameter of PSSCH and the preset scaling factor.

[0272] Optionally, the processor 1110 is configured to determine the frequency domain mapping rule of the PSFCH; and map the PSFCH sequence to a second symbol for transmitting the PSFCH sequence according to the frequency domain mapping rule;

[0273] The frequency domain mapping rule includes at least one of the following:

[0274] When the frequency domain position of the PSCCH is adjacent to that of its scheduled PSSCH, the frequency domain mapping of the PSFCH starts from the first physical resource block of the lowest sub-channel where the PSFCH is located. The first physical resource block is the lowest physical resource block excluding the PSCCH.

[0275] When the frequency domain position of the PSCCH is adjacent to that of its scheduled PSSCH, the frequency domain mapping of the PSFCH starts from the lowest physical resource block + M of the lowest sub-channel where the PSFCH is located, where M is the value of protocol predefined, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration or terminal indication.

[0276] When the frequency domain positions of the PSCCH and its scheduled PSSCH are not adjacent, the frequency domain mapping of the PSFCH starts from the lowest physical resource block of the lowest sub-channel where the PSFCH is located.

[0277] Optionally, at least one of the DMRS pattern, number of ports, and number of layers of the first DMRS is predefined by a protocol, preconfigured by a network, configured by a network, indicated by a network, preconfigured by a terminal, configured by a terminal, or indicated by a terminal.

[0278] Optionally, when the DMRS pattern of the first DMRS is the first pattern, the generation of the sequence of the first DMRS satisfies at least one of the following:

[0279] The sequence of the first DMRS is generated by reusing the generation method of the LTE sidelink DMRS;

[0280] The sequence of the first DMRS is related to the reference signal sequence or the orthogonal sequence.

[0281] Optionally, the first pattern is an LTE PSSCH DMRS pattern.

[0282] Optionally, when the DMRS pattern of the first DMRS is the first pattern, the time-frequency domain mapping of the sequence of the first DMRS satisfies at least one of the following:

[0283] The 2nd, 5th, 8th, and 11th symbols mapped to the time slot in the time domain;

[0284] The temporal mapping is performed on symbols 2 and 5 of the first time slot and symbols 1 and 4 of the second time slot of the subframe;

[0285] The frequency domain is mapped to the same frequency domain range as the data channel.

[0286] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described physical side-link feedback channel transmission method embodiments and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0287] The processor mentioned above is the processor in the terminal described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0288] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface and the processor are coupled. The processor is used to run programs or instructions to implement the various processes of the above-described physical side-link feedback channel transmission method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0289] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0290] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0291] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0292] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A transmission method for a physical sidelink feedback channel, characterized in that, include: The terminal transmits or receives the Physical Sidelink Feedback Channel (PSFCH), wherein the terminal transmits and / or receives all or part of the symbols in the DMRS pattern of the first DMRS on the first symbol, the first symbol being used for automatic gain control of the PSFCH. The DMRS pattern of the first DMRS is at least one of the following: Long Term Evolution (LTE) Physical Sidelink Shared Channel (PSSCH) DMRS diagram; LTE sidelink physical sidelink control channel (PSCCH) DMRS diagram; LTE sidelink physical sidelink broadcast channel PSBCH DMRS diagram; LTE sidelink physical sidelink discovery channel (PSDCH) DMRS diagram.

2. The method according to claim 1, characterized in that, The position of the first symbol includes at least one of the following: The first symbol of PSFCH; The symbol preceding PSFCH; The Xth symbol, X = startSLsymbols + lengthSLsymbols – Z, where startSLsymbols is the starting symbol position of the side link, lengthSLsymbols is the length of the side link symbol, and Z is the value of protocol predefined, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication.

3. The method according to claim 1, characterized in that, The first symbol is a repetition of the Y-th symbol, where Y = the position of the first symbol + L, and L is the value of protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration, or terminal indication.

4. The method according to claim 1, characterized in that, The symbol transmitted and / or received on the first symbol is the Nth symbol in the DMRS pattern of the first DMRS, where N is a value of protocol predefined, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication.

5. The method according to claim 4, characterized in that, N=4。 6. The method according to claim 1, characterized in that, The terminal transmitting 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, wherein 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 within 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 based on the transmission power of the second symbol used to transmit the PSFCH sequence and a power control factor; The transmission power of the first symbol is equal to the average power of the other symbols in the time slot; The transmission power of the first symbol is equal to a fixed power, which is determined by protocol predefinition, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication. The transmission power of the first symbol is equal to the maximum transmission power, which is determined by protocol predefinition, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication.

7. The method according to claim 1, characterized in that, The terminal receiving PSFCH includes: The terminal determines the PSFCH power and / or automatic gain control based on the received power of the first symbol, wherein: The PSFCH power and / or automatic gain control is calculated and determined based on the received power of the first symbol and the power control factor; or The PSFCH power and / or automatic gain control are determined directly based on the received power of the first symbol.

8. The method according to claim 6 or 7, characterized in that, The power control factor is calculated based on the energy of the first symbol and the energy of the second symbol used to transmit the PSFCH sequence.

9. The method according to claim 6 or 7, characterized in that, The power control factor is defined by protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration, or terminal indication.

10. The method according to claim 6 or 7, characterized in that, The power control factor is notified to the receiving terminal by the transmitting terminal.

11. The method according to claim 1, characterized in that, Also includes: When performing resource detection, the terminal determines a first signal quality parameter based on at least one of the following, wherein the first signal quality parameter includes Reference Received Power (RSRP) and / or Received Signal Strength Indication (RSSI): Based on the first M symbols of the DMRS pattern of the received first DMRS, the first signal quality parameter is determined, where M is defined by protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration, or terminal indication. The first signal quality parameter is determined based on the measured first signal quality parameter of PSSCH and the preset scaling factor.

12. The method according to claim 1, characterized in that, Also includes: The terminal determines the frequency domain mapping rules of the PSFCH; The terminal maps the PSFCH sequence to the second symbol used for transmitting the PSFCH sequence according to the frequency domain mapping rule; The frequency domain mapping rule includes at least one of the following: When the frequency domain position of the PSCCH is adjacent to that of its scheduled PSSCH, the frequency domain mapping of the PSFCH starts from the first physical resource block of the lowest sub-channel where the PSFCH is located. The first physical resource block is the lowest physical resource block excluding the PSCCH. When the frequency domain position of the PSCCH is adjacent to that of its scheduled PSSCH, the frequency domain mapping of the PSFCH starts from the lowest physical resource block + M of the lowest sub-channel where the PSFCH is located, where M is the value of protocol predefined, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration or terminal indication. When the frequency domain positions of the PSCCH and its scheduled PSSCH are not adjacent, the frequency domain mapping of the PSFCH starts from the lowest physical resource block of the lowest sub-channel where the PSFCH is located.

13. The method according to claim 1, characterized in that, The first DMRS has at least one of the following: DMRS pattern, number of ports, and number of layers, which is predefined by a protocol, preconfigured by a network, configured by a network, indicated by a network, preconfigured by a terminal, configured by a terminal, or indicated by a terminal.

14. The method according to claim 1, characterized in that, When the DMRS pattern of the first DMRS is the first pattern, the generation of the sequence of the first DMRS satisfies at least one of the following: The sequence of the first DMRS is generated by reusing the generation method of the LTE sidelink DMRS; The sequence of the first DMRS is related to the reference signal sequence or the orthogonal sequence.

15. The method according to claim 1, characterized in that, When the DMRS pattern of the first DMRS is the first pattern, the time-frequency domain mapping of the sequence of the first DMRS satisfies at least one of the following: The 2nd, 5th, 8th, and 11th symbols mapped to the time slot in the time domain; The temporal mapping is performed on symbols 2 and 5 of the first time slot and symbols 1 and 4 of the second time slot of the subframe; The frequency domain is mapped to the same frequency domain range as the data channel.

16. The method according to claim 14 or 15, characterized in that, The first pattern is an LTE PSSCH DMRS pattern.

17. A transmission device for a physical sidelink feedback channel, characterized in that, include: A transmission module for transmitting or receiving PSFCH, wherein all or part of the symbols in the DMRS pattern of a first DMRS are transmitted and / or received on a first symbol, the first symbol being used for automatic gain control of the PSFCH; The DMRS pattern of the first DMRS is at least one of the following: LTE sidelink PSSCH DMRS diagram; LTE sidelink PSCCH DMRS diagram; LTE sidelink PSBCH DMRS diagram; LTE sidelink PSDCH DMRS diagram.

18. The apparatus according to claim 17, characterized in that, The position of the first symbol includes at least one of the following: The first symbol of PSFCH; The symbol preceding PSFCH; The Xth symbol, X = startSLsymbols + lengthSLsymbols – Z, where startSLsymbols is the starting symbol position of the side link, lengthSLsymbols is the length of the side link symbol, and Z is the value of protocol predefined, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication.

19. The apparatus according to claim 17, characterized in that, The symbol transmitted and / or received on the first symbol is the Nth symbol in the DMRS pattern of the first DMRS, where N is a value of protocol predefined, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication.

20. The apparatus according to claim 17, characterized in that, The transmission module includes: A first determining submodule is configured to determine the transmission power of the first symbol, wherein 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 within 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 based on the transmission power of the second symbol used to transmit the PSFCH sequence and a power control factor; The transmission power of the first symbol is equal to the average power of the other symbols in the time slot; The transmission power of the first symbol is equal to a fixed power, which is determined by protocol predefinition, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication. The transmission power of the first symbol is equal to the maximum transmission power, which is determined by protocol predefinition, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration, or terminal indication.

21. The apparatus according to claim 17, characterized in that, The transmission module includes: The second determining submodule is used to determine the PSFCH power and / or automatic gain control based on the received power of the first symbol, wherein: The PSFCH power and / or automatic gain control is calculated and determined based on the received power of the first symbol and the power control factor; or The PSFCH power and / or automatic gain control are determined directly based on the received power of the first symbol.

22. The apparatus according to claim 17, characterized in that, Also includes: A first determining module is configured to determine a first signal quality parameter based on at least one of the following during resource detection: the first signal quality parameter includes RSRP and / or RSSI: Based on the first M symbols of the DMRS pattern of the received first DMRS, the first signal quality parameter is determined, where M is defined by protocol pre-definition, network pre-configuration, network configuration, network indication, terminal pre-configuration, terminal configuration, or terminal indication. The first signal quality parameter is determined based on the measured first signal quality parameter of PSSCH and the preset scaling factor.

23. The apparatus according to claim 17, characterized in that, Also includes: The second determining module is used to determine the frequency domain mapping rules of the PSFCH; The mapping module is used to map the PSFCH sequence to a second symbol for transmitting the PSFCH sequence according to the frequency domain mapping rule; The frequency domain mapping rule includes at least one of the following: When the frequency domain position of the PSCCH is adjacent to that of its scheduled PSSCH, the frequency domain mapping of the PSFCH starts from the first physical resource block of the lowest sub-channel where the PSFCH is located. The first physical resource block is the lowest physical resource block excluding the PSCCH. When the frequency domain position of the PSCCH is adjacent to that of its scheduled PSSCH, the frequency domain mapping of the PSFCH starts from the lowest physical resource block + M of the lowest sub-channel where the PSFCH is located, where M is the value of protocol predefined, network preconfiguration, network configuration, network indication, terminal preconfiguration, terminal configuration or terminal indication. When the frequency domain positions of the PSCCH and its scheduled PSSCH are not adjacent, the frequency domain mapping of the PSFCH starts from the lowest physical resource block of the lowest sub-channel where the PSFCH is located.

24. The apparatus according to claim 17, characterized in that, The first DMRS has at least one of the following: DMRS pattern, number of ports, and number of layers, which is predefined by a protocol, preconfigured by a network, configured by a network, indicated by a network, preconfigured by a terminal, configured by a terminal, or indicated by a terminal.

25. The apparatus according to claim 17, characterized in that, When the DMRS pattern of the first DMRS is the first pattern, the generation of the sequence of the first DMRS satisfies at least one of the following: The sequence of the first DMRS is generated by reusing the generation method of the LTE sidelink DMRS; The sequence of the first DMRS is related to the reference signal sequence or the orthogonal sequence.

26. The apparatus according to claim 17, characterized in that, When the DMRS pattern of the first DMRS is the first pattern, the time-frequency domain mapping of the sequence of the first DMRS satisfies at least one of the following: The 2nd, 5th, 8th, and 11th symbols mapped to the time slot in the time domain; The temporal mapping is performed on symbols 2 and 5 of the first time slot and symbols 1 and 4 of the second time slot of the subframe; The frequency domain is mapped to the same frequency domain range as the data channel.

27. A terminal, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the transmission method for the physical sidelink control channel as described in any one of claims 1-16.

28. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the transmission method for the physical sidelink control channel as described in any one of claims 1-16.

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