Wireless communication device and wireless communication method

Abstract

To provide a wireless communication device and a wireless communication method that transmit information for supporting retransmission in communication between user equipment and user equipment using a feedback channel.SOLUTION: In a wireless communication method of first user equipment, the first user equipment, upon receiving data from second user equipment, performs decoding on the data from the second user equipment, and transmits, to the second user equipment, feedback information according to a decoding state associated with the decoding on the data from the second user equipment over a feedback channel. The feedback information is carried in a sequence, and the feedback information is a hybrid automatic repeat request (HARQ) acknowledgment (ACK) or a HARQ negative acknowledgment (NACK). The sequence is determined based on the feedback information, the identification information (ID) of the first user equipment, and the ID of the second user equipment.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to the field of communication systems, and more particularly to a wireless communication device and method. [Background technology]

[0002] In New Radio Vehicle-to-Everything (NR-V2X) technology, unicast, groupcast, and broadcast are all supported and considered. In unicast, a feedback channel is required to improve reliability and resource efficiency. A first user equipment can feed back some information to a second user equipment to assist the second user equipment in retransmission. In NR-V2X technology, it is necessary to consider how the feedback channel should be designed.

[0003] Therefore, there is a need to propose a wireless communication device and a wireless communication method that can improve reliability and resource efficiency using a feedback channel. Summary of the Invention

[0004] An object of the present disclosure is to propose a wireless communication device and a wireless communication method that can improve reliability and resource efficiency by using a feedback channel.

[0005] In a first aspect of the disclosure, a first user equipment for wireless communication includes a memory, a transceiver, and a processor coupled to the memory and the transceiver, the processor configured to control the transceiver to receive data from a second user equipment and perform decoding of the data from the second user equipment, and to control the transceiver to transmit feedback information to the second user equipment according to a decoding status related to the decoding of the data from the second user equipment.

[0006] In a second aspect of the present disclosure, a wireless communication method for a first user equipment includes receiving data from a second user equipment, decoding the data from the second user equipment, and transmitting feedback information to the second user equipment corresponding to a decoding status related to the decoding of the data from the second user equipment.

[0007] In a third aspect of the disclosure, a second user equipment for wireless communication includes a memory, a transceiver, and a processor coupled to the memory and the transceiver, the processor configured to control the transceiver to transmit data to the first user equipment and to control the transceiver to receive feedback information from the first user equipment responsive to a decoding status related to decoding of the data.

[0008] In a fourth aspect of the present disclosure, a wireless communication method for a second user equipment includes transmitting data to a first user equipment and receiving feedback information from the first user equipment corresponding to a decoding state related to decoding of the data.

[0009] In a fifth aspect of the present disclosure, a non-transitory machine-readable storage medium has stored thereon instructions that, when executed by a computer, cause the computer to perform the method set forth above.

[0010] In a sixth aspect of the present disclosure, a terminal device includes a processor and a memory configured to store a computer program, the processor configured to execute the computer program stored in the memory to perform the above method. [Brief description of the drawings]

[0011] In order to more clearly illustrate the embodiments of the present disclosure or related technologies, the following figures described in the embodiments are briefly introduced. It is clear that the drawings are only some embodiments of the present disclosure, and those skilled in the art can obtain other figures according to these figures without making assumptions.

[0012] [Figure 1]FIG. 2 is a block diagram of a first user equipment and a second user equipment for wireless communication according to one embodiment of the present disclosure. [Diagram 2] 1 is a flowchart illustrating a wireless communication method for a first user equipment according to an embodiment of the present disclosure. [Diagram 3] 10 is a flowchart illustrating a wireless communication method of a second user equipment according to an embodiment of the present disclosure. [Figure 4] FIG. 2 is a schematic diagram of an exemplary diagram of user equipment transmission and feedback according to an embodiment of the present disclosure. [Diagram 5] FIG. 2 is a schematic diagram of an exemplary diagram of user equipment transmission and feedback according to an embodiment of the present disclosure. [Figure 6] FIG. 2 is a schematic diagram of an example diagram of transmission resources for a feedback channel according to an embodiment of the present disclosure. [Figure 7] FIG. 2 is a schematic diagram of an example diagram of transmission resources for a feedback channel according to an embodiment of the present disclosure. [Figure 8] FIG. 2 is a schematic diagram of an example diagram of transmission resources for a feedback channel according to an embodiment of the present disclosure. [Figure 9] FIG. 1 is a block diagram of a system for wireless communication according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, together with technical matters, structural features, objectives achieved, and effects. In particular, the terms in the embodiments of the present disclosure are merely for describing the objectives of specific embodiments, and are not intended to limit the present disclosure.

[0014] FIG. 1 illustrates that in some embodiments, a first user equipment (UE) 10 and a second user equipment 20 for wireless communication according to an embodiment of the present disclosure are provided. The data transmitter UE 20 may include a processor 21, a memory 22, and a transceiver 23. The data receiver UE 10 may include a processor 11, a memory 12, and a transceiver 13. The processor 11 or 21 may be configured to perform the proposed functions, procedures, and / or methods described herein. A layer of a radio interface protocol may be implemented in the processor 11 or 21. The memory 12 or 22 is operatively coupled to the processor 11 or 21 and stores various information for operating the processor 11 or 21. The transceiver 13 or 23 is operatively coupled to the processor 11 or 21, and the transceiver 13 or 23 transmits and / or receives radio signals.

[0015] The processor 11 or 21 may include an application specific integrated circuit (ASIC), other chipset, logic circuitry, and / or data processing device. The memory 12 or 22 may include a read only memory (ROM), a random access memory (RAM), a flash memory, a memory card, a storage medium, and / or other storage device. The transceiver unit 13 or 23 may include a baseband circuit for processing radio frequency signals. When an embodiment is implemented in software, the techniques described herein may be implemented with modules (e.g., procedures, functions, etc.) that perform the functions described herein. The modules may be stored in the memory 12 or 22 and executed by the processor 11 or 21. The memory 12 or 22 may be implemented within the processor 11 or 21 or external to the processor 11 or 21, and the memory 12 or 22 and the processor 11 or 21 may be communicatively coupled using various means known in the art.

[0016] The communication between UEs relates to vehicle-to-everything (V2X) communications, including vehicle-to-vehicle (V2V), vehicle-to-pedestrian (V2P), and vehicle-to-infrastructure / network (V2I / N) communications based on sidelink technologies developed under 3rd generation partnership project (3GPP) Releases 14, 15, 16 and later. The UEs communicate directly with each other over a sidelink interface, such as a PC5 interface. The embodiments of the present disclosure may be applied to any system based on sidelink communications, such as device-to-device (D2D).

[0017] In some embodiments, the processor 11 is configured to control the transceiver 13 to receive data from the second user equipment 20 and perform decoding of the data from the second user equipment 20, and to control the transceiver 13 to transmit feedback information to the second user equipment 20 according to a decoding status related to the decoding of the data from the second user equipment 20. In some embodiments, the feedback information is carried by a sequence. In some embodiments, the feedback information is transmitted by a feedback channel, such as a Physical Sidelink Feedback Channel (PSFCH).

[0018] In some embodiments, the feedback information is a Hybrid Automatic Repeat Request (HARQ) Acknowledgement (ACK) or a HARQ Negative Acknowledgement (NACK). In some embodiments, the sequence is determined based on at least one of the feedback information, an identity (ID) of the first user equipment 10, an ID of the second user equipment 20, and an ID of a group including the first user equipment 10 and the second user equipment 20. In some embodiments, the communication between the first user equipment 10 and the second user equipment 20 is performed using unicast or groupcast. The communication is unicast, meaning that the PSCCH and / or PSSCH are transmitted to only one user equipment. The communication is groupcast, meaning that the PSCCH and / or PSSCH are transmitted to a group of user equipment. In some embodiments, data is carried by the PSSCH. The PSCCH is used to schedule the PSSCH. In some embodiments, when communication between the first user equipment 10 and the second user equipment 20 is performed using groupcast, the sequence is determined based on at least one of the feedback information, an identity (ID) of the first user equipment 10, an ID of the second user equipment 20, and an ID of a group including the first user equipment 10 and the second user equipment 20. In some embodiments, the ID of the first user equipment or the second user equipment is a Cell Radio Network Temporary Identifier (C-RNTI) or an identity, which is used to identify the UE within the group. For example, there are four UEs in the group, and the IDs of each UE in the group are 0, 1, 2, 3, respectively.

[0019] In some embodiments, the feedback information is transmitted in one orthogonal frequency division multiplexing (OFDM) symbol, and the one OFDM symbol is adjacent to the OFDM symbol used as a guard period (GP). In some embodiments, the one OFDM symbol is the penultimate OFDM symbol of a subframe and / or slot, and the last OFDM symbol is used as a GP. In some embodiments, the one OFDM symbol is the penultimate OFDM symbol of a subframe and / or slot, and the last and penultimate OFDM symbols are used as a GP. In some embodiments, the one OFDM symbol is the last OFDM symbol of a subframe and / or slot, and the last OFDM symbol can also be used as a GP. In some embodiments, the feedback information is repeatedly transmitted in two adjacent OFDM symbols, and the second OFDM symbol containing the feedback information of the two adjacent OFDM symbols is adjacent to the OFDM symbol used as a GP. The two adjacent OFDM symbols are, for example, the penultimate and penultimate OFDM symbols of a subframe and / or slot. Two adjacent OFDM symbols carry retransmitted feedback information, and the first of the two adjacent OFDM symbols can be used as an automatic gain control (AGC) symbol.

[0020] In some embodiments, the data from the second user equipment is carried by a physical sidelink shared channel (PSSCH), and the feedback information corresponds to a PSSCH in the same subframe and / or in the same slot, or in a different subframe and / or in a different slot. In some embodiments, the feedback information is carried by a feedback channel, and the transmission resources of the feedback channel are determined by or indicated by the transmission resources of the physical sidelink control channel (PSCCH) or the PSSCH. In some embodiments, the number of frequency resources of the feedback channel is the same as the number of frequency resources of the PSSCH, or the number of frequency resources of the feedback channel is the same as the number of frequency resources of the PSCCH associated with the PSSCH, or the number of frequency resources of the feedback channel is preconfigured or configured by the network. The frequency resources are in units of physical resource blocks (PRBs) or subchannels. In some embodiments, the frequency start position of the feedback channel is the same as the frequency start position of the PSCCH or the PSSCH. In some embodiments, the frequency end position of the feedback channel is the same as the frequency end position of the PSCCH or the PSSCH. In some embodiments, the feedback information is mapped to one resource element (RE) for every N REs of the OFDM symbol to which the feedback information is mapped. In some embodiments, the frequency length of the feedback channel is pre-configured or configured by the network. In some embodiments, the timing gap between the subframe or slot containing the feedback channel and the subframe or slot containing the PSCCH or PSSCH is pre-configured or configured by the network. In some embodiments, the PSCCH indicates the time and / or frequency resource of the feedback channel.

[0021] In some embodiments, the processor 21 is configured to control the transceiver 23 to transmit data to the first user equipment 10 and to control the transceiver 23 to receive feedback information from the first user equipment 10 responsive to a decoding status related to the decoding of the data. In some embodiments, the feedback information is carried by a sequence. In some embodiments, the feedback information is transmitted by a feedback channel, such as a Physical Sidelink Feedback Channel (PSFCH).

[0022] In some embodiments, the processor 21 is configured to detect the sequence and determine based on the detection whether there is feedback information sent to the second user equipment 20 itself and who sent the feedback information. In particular, the detection is performed by cross-correlation between the local sequence and the signal received by the second user equipment.

[0023] In some embodiments, for feedback, the first user equipment 10 is a transmitting user equipment and the second user equipment 20 is a receiving user equipment. For PSCCH and / or PSSCH, the first user equipment 10 is a receiving user equipment and the second user equipment 20 is a transmitting user equipment. In some embodiments, data from the second user equipment is carried by the PSSCH. The PSCCH is used to schedule the PSSCH. The feedback information corresponds to a decoding state related to the decoding of the data and is carried by the feedback channel.

[0024] 2 illustrates a method 200 for wireless communication for a first user equipment according to an embodiment of the present disclosure. In some embodiments, the method 200 includes receiving data from a second user equipment at block 202, performing decoding of the data from the second user equipment at block 204, and transmitting feedback information to the second user equipment according to a decoding status associated with the decoding of the data from the second user equipment at block 206. In some embodiments, the feedback information is carried by a sequence. In some embodiments, the sequence is transmitted by a feedback channel, such as a physical sidelink feedback channel (PSFCH).

[0025] In some embodiments, the feedback information is a Hybrid Automatic Repeat Request (HARQ) Acknowledgement (ACK) or a HARQ Negative Acknowledgement (NACK). In some embodiments, the sequence is determined based on at least one of the feedback information, an identity (ID) of the first user equipment 10, an ID of the second user equipment 20, and an ID of a group including the first user equipment 10 and the second user equipment 20. In some embodiments, the communication between the first user equipment 10 and the second user equipment 20 is performed using unicast or groupcast. The communication is unicast, meaning that the PSCCH and / or PSSCH are transmitted to only one user equipment. The communication is groupcast, meaning that the PSCCH and / or PSSCH are transmitted to a group of user equipment. In some embodiments, data is carried by the PSSCH. The PSCCH is used to schedule the PSSCH. In some embodiments, when the communication between the first user equipment 10 and the second user equipment 20 is performed using groupcast, the sequence is determined based on at least one of the feedback information, an identification (ID) of the first user equipment 10, an ID of the second user equipment 20, and an ID of a group including the first user equipment 10 and the second user equipment 20. In some embodiments, the ID of the first user equipment or the second user equipment is a Cell Radio Network Temporary Identifier (C-RNTI) or an identification, which is used to identify the UE in the group. For example, there are four UEs in the group, and the IDs of each UE in the group are 0, 1, 2, and 3, respectively. In some embodiments, the feedback information is transmitted in one Orthogonal Frequency Division Multiplexing (OFDM) symbol, which is adjacent to the OFDM symbol used as the guard period. In some embodiments, the feedback information is repeatedly transmitted in two adjacent OFDM symbols, and the second OFDM symbol containing the feedback information of the two adjacent OFDM symbols is adjacent to the OFDM symbol used as the guard period.In some embodiments, the one OFDM symbol is the penultimate OFDM symbol of the subframe and / or slot, and the last and penultimate OFDM symbols are used as GP. In some embodiments, the one OFDM symbol is the last OFDM symbol of the subframe and / or slot, and the last OFDM symbol can also be used as GP. The two adjacent OFDM symbols are, for example, the penultimate and penultimate OFDM symbols of the subframe and / or slot. The two adjacent OFDM symbols are a retransmitted sequence. Furthermore, the first OFDM symbol of the two adjacent OFDM symbols can be used as an AGC symbol.

[0026] In some embodiments, the data from the second user equipment is carried by a physical sidelink shared channel (PSSCH), and the feedback information corresponds to a PSSCH in the same subframe and / or in the same slot, or in different subframes and / or in different slots. In some embodiments, the feedback information is carried by a feedback channel, and the transmission resources of the feedback channel are determined by or indicated by a physical sidelink control channel (PSCCH) or the transmission resources of the PSSCH. In some embodiments, the number of frequency resources of the feedback channel is the same as the number of frequency resources of the PSSCH, or the number of frequency resources of the feedback channel is the same as the number of frequency resources of the PSCCH associated with the PSSCH, or the number of frequency resources of the feedback channel is preconfigured or configured by the network. The frequency resources are in units of physical resource blocks (PRBs) or subchannels.

[0027] In some embodiments, the frequency start of the feedback channel is the same as the frequency start of the PSCCH or PSSCH. In some embodiments, the frequency end of the feedback channel is the same as the frequency end of the PSCCH or PSSCH. In some embodiments, the feedback information is mapped to one resource element (RE) for every N REs of the OFDM symbol to which the feedback information is mapped. In some embodiments, the frequency length of the feedback channel is pre-configured or set by the network. In some embodiments, the timing gap between the subframe or slot containing the feedback channel and the subframe or slot containing the PSCCH or PSSCH is pre-configured or set by the network. In some embodiments, the PSCCH indicates the time and / or frequency resources of the feedback channel.

[0028] 3 illustrates a method 300 for wireless communication for a second user equipment according to an embodiment of the present disclosure. In some embodiments, the method 300 includes transmitting data to the first user equipment at block 302 and receiving feedback information from the first user equipment responsive to a decoding status related to decoding of the data at block 304. In some embodiments, the feedback information is carried by a sequence. In some embodiments, the sequence is transmitted by a feedback channel, such as a physical sidelink feedback channel (PSFCH).

[0029] In some embodiments, the feedback information is a Hybrid Automatic Repeat Request (HARQ) Acknowledgement (ACK) or a HARQ Negative Acknowledgement (NACK). In some embodiments, the sequence is determined based on at least one of the feedback information, an identity (ID) of the first user equipment 10, an ID of the second user equipment 20, and an ID of a group including the first user equipment 10 and the second user equipment 20. In some embodiments, the communication between the first user equipment 10 and the second user equipment 20 is performed using unicast or groupcast. The communication is unicast, meaning that the PSCCH and / or PSSCH are transmitted to only one user equipment. The communication is groupcast, meaning that the PSCCH and / or PSSCH are transmitted to a group of user equipment. In some embodiments, data is carried by the PSSCH. The PSCCH is used to schedule the PSSCH. In some embodiments, when the communication between the first user equipment 10 and the second user equipment 20 is performed using groupcast, the sequence is determined based on at least one of the feedback information, an identification (ID) of the first user equipment 10, an ID of the second user equipment 20, and an ID of a group including the first user equipment 10 and the second user equipment 20. In some embodiments, the ID of the first user equipment or the second user equipment is a Cell Radio Network Temporary Identifier (C-RNTI) or an identification, which is used to identify the UE in the group. For example, there are four UEs in the group, and the IDs of each UE in the group are 0, 1, 2, and 3, respectively. In some embodiments, the feedback information is transmitted in one Orthogonal Frequency Division Multiplexing (OFDM) symbol, which is adjacent to the OFDM symbol used as the guard period. In some embodiments, the feedback information is repeatedly transmitted in two adjacent OFDM symbols, and the second OFDM symbol containing the feedback information of the two adjacent OFDM symbols is adjacent to the OFDM symbol used as the guard period.In some embodiments, the one OFDM symbol is the penultimate OFDM symbol of the subframe and / or slot, and the last and penultimate OFDM symbols are used as GP. In some embodiments, the one OFDM symbol is the last OFDM symbol of the subframe and / or slot, and the last OFDM symbol can also be used as GP. The two adjacent OFDM symbols are, for example, the penultimate and penultimate OFDM symbols of the subframe and / or slot. The two adjacent OFDM symbols are a retransmitted sequence. Furthermore, the first OFDM symbol of the two adjacent OFDM symbols can be used as an AGC symbol.

[0030] In some embodiments, the data from the second user equipment is carried by a physical sidelink shared channel (PSSCH), and the feedback information corresponds to a PSSCH in the same subframe and / or in the same slot, or in different subframes and / or in different slots. In some embodiments, the feedback information is carried by a feedback channel, and the transmission resources of the feedback channel are determined by or indicated by a physical sidelink control channel (PSCCH) or the transmission resources of the PSSCH. In some embodiments, the number of frequency resources of the feedback channel is the same as the number of frequency resources of the PSSCH, or the number of frequency resources of the feedback channel is the same as the number of frequency resources of the PSCCH associated with the PSSCH, or the number of frequency resources of the feedback channel is preconfigured or configured by the network. The frequency resources are in units of physical resource blocks (PRBs) or subchannels.

[0031] In some embodiments, the frequency start of the feedback channel is the same as the frequency start of the PSCCH or PSSCH. In some embodiments, the frequency end of the feedback channel is the same as the frequency end of the PSCCH or PSSCH. In some embodiments, the feedback information is mapped to one resource element (RE) for every N REs of the OFDM symbol to which the feedback information is mapped. In some embodiments, the frequency length of the feedback channel is pre-configured or set by the network. In some embodiments, the timing gap between the subframe or slot containing the feedback channel and the subframe or slot containing the PSCCH or PSSCH is pre-configured or set by the network. In some embodiments, the PSCCH indicates the time and / or frequency resources of the feedback channel.

[0032] In some embodiments, the method 300 further includes detecting the sequence and determining based on the detection that there is feedback information sent to the second user equipment itself and who sent the feedback information, In some embodiments, the detection is performed by cross-correlation between the local sequence and the signal received by the second user equipment.

[0033] FIG. 4 is an exemplary diagram of user equipment transmission and feedback according to an embodiment of the present disclosure. FIG. 4 shows that in some embodiments, two UE1, UE2 perform unicast communication. UE2 transmits unicast data to UE1, and UE1 needs to feedback ACK or NACK to UE2 based on the decoding state. The ACK (or NACK) can be carried by a specific sequence. The following description is based on feedback ACK from UE1 to UE2, but can also be applied to feedback NACK from UE1 to UE2. In some embodiments, the specific sequence is transmitted by a feedback channel such as a physical sidelink feedback channel (PSFCH).

[0034] In some embodiments, either UE2 or UE1 may be involved in several simultaneous unicast transmissions. For example, FIG. 5 shows that in some embodiments, UE2 has separate unicast communication with UE1 and UE3, and UE1 has separate unicast communication with UE2 and UE4. If UE1 wants to feedback an ACK or NACK to UE1, it needs to differentiate the multiple feedback channels by carrying its (i.e., UE1) ID and the target receiver (i.e., UE2). As a result, based on the IDs of UE2 and UE1, UE2 can determine whether the feedback is for it and who is sending the feedback information.

[0035] The feedback information (e.g., ACK) may be carried by a specific sequence. In some embodiments, the specific sequence is transmitted by a feedback channel, such as a physical sidelink feedback channel (PSFCH). The IDs of the transmitter and / or the target receiver may also be carried by the specific sequence. This means that the specific sequence is generated or determined by the feedback information (e.g., ACK) and / or the ID of the transmitter (e.g., the Cell Radio Network Temporary Identifier (C-RNTI) of UE1, which is the transmitter of the feedback information) and / or the ID of the target receiver (e.g., the C-RNTI of UE2, which is the target receiver of the feedback information). The receiver side of the feedback channel (i.e., UE2) may detect whether there is feedback information (e.g., ACK) sent by the corresponding transmitter (i.e., UE1). For example, UE2 transmits data to UE1 and expects feedback from UE1. Then, UE2 may generate a corresponding sequence based on the feedback information (e.g., ACK) and / or the ID of the transmitter (e.g., the C-RNTI of UE1) and / or the ID of the target receiver (e.g., the C-RNTI of UE2). UE2 can cross-correlate the generated local sequence with the received signal to determine whether there is feedback information (e.g., ACK) sent from UE1 to UE2 itself. For example, UE2 can determine that there is an ACK sent by UE1 when the peak-to-average ratio of the cross-correlation calculation is above a threshold. The threshold can be preset or set by the network.

[0036] Whether an ACK or a NACK (or other information) can be indicated in a sequence can be pre-configured, pre-specified in a specification, or configured by the network. For example, an ACK is configured to be indicated in one sequence and a NACK is configured to be indicated in another sequence. In another example, the sequence is generated based on a function or polynomial, and the feedback information and / or the ID of the transmitter UE and / or the ID of the receiver UE are input elements to the function or polynomial. If the UE wants to feed back an ACK, it can generate a sequence based on the ACK information, the ID of the transmitter and the ID of the target receiver. If the UE can detect such a sequence (e.g., by cross-correlation between the local sequence and the received signal), the UE can determine that there is an ACK sent to it, and the UE can further determine who sent the ACK.

[0037] This scheme can be applied to both unicast and groupcast / multicast. In unicast, only one UE needs to provide feedback. Meanwhile, in groupcast, several UEs need to provide feedback. Each UE can generate a sequence based on the feedback information and / or its own ID and / or the ID of the target receiver and / or the ID of the group. At the feedback information receiver side, the UE can separately detect the feedback based on different sequences from multiple UEs. For each sequence detection, the above mentioned method can be used.

[0038] The feedback sequence can be transmitted in only one OFDM symbol. For example, the sequence can be transmitted in the penultimate symbol of a symbol and / or slot. Additionally, the last symbol can be used as a guard period (GP), as shown in FIG.

[0039] In this subframe and / or slot, PSCCH and / or PSSCH are transmitted at the beginning of the subframe and / or slot. Feedback is transmitted in the penultimate symbol. The feedback symbol and adjacent symbols are used as GP.

[0040] Alternatively, the feedback sequence may be transmitted in the last OFDM symbol of a subframe and / or slot as shown in Figures 7 and 8. The sequence only occupies one resource element out of N resource elements, where N=2 in Figure 7 and N=3 in Figure 8. The resource elements (RE) used for the feedback sequence within a physical resource block (PRB) may be pre-configured, pre-defined or configured by the network.

[0041] If a sequence is transmitted every N resource elements and the remaining resource elements are empty, the waveform of the sequence is repeated N times in the time domain within the time of one OFDM symbol. Only one of the waveforms can be transmitted in the time domain, the others can be set to 0, and none is transmitted or used as GP. For example, in Figure 8, when the signal on the last OFDM symbol is transformed to the time domain, this signal will be retransmitted three times. The first and last ones are not transmitted or used as GP or switching gap, and only the second one can be transmitted. This can improve resource efficiency.

[0042] The feedback channel may correspond to a PSSCH in the same subframe. In this case, the frequency resources of the feedback channel may be associated with the PSSCH or PSCCH. For example, the number of frequency resources of the feedback channel may be the same as the number of frequency resources of the PSSCH. Or, the number of frequency resources of the feedback channel may be the same as the number of frequency resources of the PSCCH associated with the PSSCH. Or, the number of frequency resources of the feedback channel is pre-configured or configured by the network. The frequency start of the feedback channel is the same as the frequency start of the PSCCH or PSSCH, or the frequency end of the feedback channel is the same as the frequency end of the PSCCH or PSSCH. The frequency resources are in units of physical resource blocks (PRBs) or subchannels. In some embodiments, the feedback information is mapped to one resource element (RE) for every N REs of the OFDM symbol to which the feedback information is mapped. In some embodiments, the timing gap between the subframe or slot containing the feedback channel and the subframe or slot containing the PSCCH or PSSCH is pre-configured or configured by the network. In some embodiments, the PSCCH indicates the time and / or frequency resources of the feedback channel.

[0043] Alternatively, the frequency start of the feedback channel is the same as the frequency start of the PSCCH or PSSCH, or the frequency end of the feedback channel is the same as the frequency end of the PSCCH or PSSCH, and the frequency length of the feedback channel is pre-configured or set by the network. In some embodiments, the feedback information is mapped to one resource element (RE) for every N REs of the OFDM symbol to which the feedback information is mapped. In some embodiments, the timing gap between the subframe or slot containing the feedback channel and the subframe or slot containing the PSCCH or PSSCH is pre-configured or set by the network. In some embodiments, the PSCCH indicates the time and / or frequency resources of the feedback channel.

[0044] A feedback channel in a subframe may also correspond to a PSSCH in another subframe. Furthermore, in this case, the resource of the feedback channel may be indicated by the data transmitter (i.e., UE2 in FIG. 4) or may be autonomously selected by the data receiver (i.e., UE1 in FIG. 4). The resource of the feedback channel may be indicated by the transmitter, and the time and / or frequency resource of the feedback channel may be indicated by the transmitter. For the time resource, information such as the starting position of the feedback channel in the time domain, the subframe index or slot index used for the feedback channel, the offset between the subframe and / or slot for the feedback channel and the PSSCH subframe may be indicated. For the frequency resource, information such as the starting position of the feedback channel, the smallest PRB index or subchannel index, the length of the frequency resource, the number of PRBs or subchannels used for the feedback channel may be indicated.

[0045] In groupcast, multiple UEs that want to provide feedback can be code division multiplexed (CDM) multiplexed within the same resource. The sequences for multiple UEs are different because the transmitter IDs are different.

[0046] When the feedback channel occupies 1 / N REs in one OFDM symbol, as in Figures 7 and 8, the feedback channels of multiple UEs can be frequency division multiplexed (FDM) and CDM in that OFDM symbol. For example, UE1 in Figure 5 uses even REs in a PRB, and UE3 in Figure 5 uses odd REs in the same PRB.

[0047] FIG. 9 is a block diagram of an example system 700 for wireless communication according to an embodiment of the present disclosure. The embodiments described herein may be implemented into a system using any suitably configured hardware and / or software. FIG. 9 illustrates system 700 including radio frequency (RF) circuitry 710, baseband circuitry 720, application circuitry 730, memory / storage 740, display 750, camera 760, sensor 770, and input / output (I / O) interface 780, coupled together at least as shown.

[0048] The application circuitry 730 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processors may include any combination of general-purpose processors and special-purpose processors, such as graphics processors and application processors. The processors may be coupled to memory / storage devices and may be configured to execute instructions stored in the memory / storage devices to enable various applications and / or operating systems to run on the system.

[0049] The baseband circuitry 720 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processor may include a baseband processor. The baseband circuitry may handle various radio control functions that enable communication with one or more wireless networks via RF circuitry. The radio control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, and the like. In some embodiments, the baseband circuitry may provide communication compatible with one or more wireless technologies. For example, in some embodiments, the baseband circuitry may support communication with an Evolved Universal Terrestrial Radio Access Network (EUTRAN) and / or other Wireless Metropolitan Area Networks (WMANs), Wireless Local Area Networks (WLANs), and Wireless Personal Area Networks (WPANs). An embodiment in which the baseband circuitry is configured to support wireless communication of more than one wireless protocol may be referred to as a multimode baseband circuit.

[0050] In various embodiments, the baseband circuitry 720 may include circuitry for operating on signals that are not strictly considered to be at baseband frequencies. For example, in some embodiments, the baseband circuitry may include circuitry for operating on signals having intermediate frequencies that are between baseband frequencies and radio frequencies.

[0051] The RF circuitry 710 may enable communication with a wireless network using modulated electromagnetic radiation through a non-solid medium. In various embodiments, the RF circuitry may include switches, filters, amplifiers, etc. to facilitate communication with the wireless network.

[0052] In various embodiments, RF circuitry 710 may include circuitry for operating with signals that are not strictly considered to be radio frequencies. For example, in some embodiments, RF circuitry may include circuitry for operating with signals having intermediate frequencies that are between baseband frequencies and radio frequencies.

[0053] In various embodiments, the transmit, control, or receive circuitry described above with respect to a user equipment, eNB, or gNB may be embodied in whole or in part in one or more of RF circuitry, baseband circuitry, and / or application circuitry. As used herein, "circuitry" may refer to, be part of, or include application specific integrated circuits (ASICs), electronic circuits, processors (shared, dedicated, or groups), and / or memories (shared, dedicated, or groups), combinatorial logic circuits, and / or other suitable hardware components that provide the described functionality. In some embodiments, electronic device circuitry may be implemented in one or more software or firmware modules, or functionality associated with electronic device circuitry may be implemented by one or more software or firmware.

[0054] In some embodiments, some or all of the baseband circuitry, application circuitry, and / or memory / storage components may be implemented together on a system on a chip (SOC).

[0055] Memory / storage 740 may be used, for example, to load and store data and / or instructions for the system. The memory / storage for one embodiment may include any combination of suitable volatile memory, such as dynamic random access memory (DRAM), and / or suitable non-volatile memory, such as flash memory.

[0056] In various embodiments, I / O interface 780 may include one or more user interfaces designed to enable a user to interact with the system and / or peripheral component interfaces designed to enable peripheral components to interact with the system. User interfaces may include, but are not limited to, a physical keyboard or keypad, a touchpad, a speaker, a microphone, etc. Peripheral component interfaces may include, but are not limited to, a non-volatile memory port, a Universal Serial Bus (USB) port, an audio jack, and a power interface.

[0057] In various embodiments, the sensors 770 may include one or more detection devices to determine environmental conditions and / or location information associated with the system. In some embodiments, the sensors may include, but are not limited to, gyro sensors, accelerometers, proximity sensors, ambient light sensors, and a positioning unit. The positioning unit may also be part of or interact with baseband and / or RF circuitry to communicate with components of a positioning network, such as Global Positioning System (GPS) satellites.

[0058] In various embodiments, display 750 may include a display such as a liquid crystal display or a touch screen display. In various embodiments, system 700 may be a portable computing device, such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, an ultrabook, a smartphone, etc. In various embodiments, the system may have more or fewer components and / or a different architecture. Where appropriate, the methods described herein may be implemented as a computer program. The computer program may be stored on a storage medium, such as a non-transitory storage medium.

[0059] In summary, in some embodiments of the present disclosure, the feedback channel may be as follows:

[0060] 1. The feedback channel sequence is used to carry an ACK or NACK.

[0061] 2. The sequence is determined based on at least one of the feedback information, an identification (ID) of the first user equipment, an ID of the second user equipment, and an ID of a group including the first user equipment and the second user equipment.

[0062] 3. The feedback information is transmitted in one orthogonal frequency division multiplexing (OFDM) symbol, and the one OFDM symbol is adjacent to the OFDM symbol used as the GP. In some embodiments, the feedback information is repeatedly transmitted in two adjacent OFDM symbols, and the second OFDM symbol containing the feedback information among the two adjacent OFDM symbols is adjacent to the OFDM symbol used as the GP. The two adjacent OFDM symbols may be, for example, the penultimate and third-last OFDM symbols of a subframe and / or slot. The two adjacent OFDM symbols carry the retransmitted feedback information. Furthermore, the first OFDM symbol among the two adjacent OFDM symbols may be used as an AGC symbol.

[0063] 4. The feedback channel may correspond to a PSSCH in the same slot or in a different slot.

[0064] 5. The transmission resource of the feedback channel may be determined by the transmission resource of the PSCCH or PSSCH, or may be indicated by the PSCCH.

[0065] 6. This can be applied to both unicast and groupcast.

[0066] The embodiments of the present disclosure are a combination of technologies / processes that can be adopted in 3GPP specifications to create an end product.

[0067] Those skilled in the art will understand that each of the units, algorithms, and steps described and disclosed in the embodiments of the present disclosure can be realized using electronic devices or a combination of software for computers and electronic devices. Whether a function operates in hardware or software is determined by the design requirements for the application state and technical planning. Those skilled in the art can use various methods to realize the functions for each specific application, but such realization should not exceed the scope of the present disclosure. Those skilled in the art will understand that the operation processes of the above-mentioned systems, devices, and units are basically the same, so they can refer to the operation processes of the systems, devices, and units in the above-mentioned embodiments. For the sake of simplicity and brevity, these operation processes will not be described in detail.

[0068] It is understood that the system, device, and method disclosed in the embodiments of the present disclosure can be realized in other ways. The above-mentioned embodiments are merely examples. The boundaries of the units are based on logical functions only, and other boundaries exist in reality. The units or components may be combined or integrated into another system. Also, some features may be excluded or omitted. On the other hand, the shown or described mutual couplings, direct couplings, or communication couplings may operate through some ports, devices, or units, whether indirectly or communicatively, using electrical, mechanical, or other types of forms.

[0069] For the purposes of explanation, these units as separate components may or may not be physically separated. The display unit may or may not be a physical unit, i.e., located in one location or distributed across multiple network units. Some or all of the units may be used according to the purpose of the embodiment. Furthermore, each functional unit in each of the embodiments may be integrated into one processing unit that is physically independent, or may be integrated into one processing unit that has two or more units.

[0070] When the software functional unit is realized, used, and sold as a product, it can be stored in a readable storage medium in a computer. Based on this understanding, the technical plan proposed by the present disclosure can be essentially or partially realized in the form of a software product. Alternatively, a part of the technical plan that is beneficial to the conventional technology can be realized in the form of a software product. A software product in a computer, including a plurality of commands for a computing device (such as a personal computer, a server, or a network device), is stored in a storage medium to execute all or some of the steps disclosed in the embodiments of the present disclosure. The storage medium includes a USB disk, a portable hard disk, a read-only memory (ROM), a random access memory (RAM), a floppy disk, or other types of media that can store program code.

[0071] While the present disclosure has been described in terms of what are considered to be the most practical and preferred embodiments, it is understood that the present disclosure is not limited to the disclosed embodiments, but is intended to cover various arrangements that may be made without departing from the scope of the broadest interpretation of the appended claims.

Claims

1. 1. A method of wireless communication for a first user equipment, comprising: Receiving data from a second user equipment; and transmitting, on a feedback channel, feedback information to the second user equipment in response to receiving the data from the second user equipment; the feedback information is conveyed by a sequence, the feedback information being a Hybrid Automatic Repeat Request (HARQ) Acknowledgement (ACK) or a HARQ Negative Acknowledgement (NACK); The sequence is determined based on the feedback information, an identity (ID) of the first user equipment, and an ID of the second user equipment; A method according to claim 1, wherein a symbol following an Orthogonal Frequency Division Multiplexing (OFDM) symbol of the feedback channel in which the feedback information is transmitted is used as a Guard Period (GP).

2. The method of claim 1 , wherein communication between the first user equipment and the second user equipment is performed using unicast or groupcast.

3. 2. The method of claim 1, wherein the feedback information is repeatedly transmitted in two adjacent OFDM symbols, a second of the two adjacent OFDM symbols being adjacent to the OFDM symbol used as the GP.

4. 2. The method of claim 1, wherein the data from the second user equipment is carried by a Physical Sidelink Shared Channel (PSSCH), and the feedback channel corresponds to the PSSCH in a different slot.

5. The method of claim 1, wherein the transmission resource of the feedback channel is determined by or indicated by the transmission resource of a physical sidelink control channel (PSCCH) or a PSSCH.

6. 6. The method of claim 5, wherein a frequency start position of the feedback channel is the same as a frequency start position of the PSCCH or the PSSCH, or a frequency end position of the feedback channel is the same as a frequency end position of the PSCCH or the PSSCH.

7. A first user equipment for wireless communication, comprising: A first user equipment, the user equipment being configured to cause the method of any one of claims 1-6 to be performed.

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