CN114128327B

CN114128327B - SFCI sending method and SFCI sending device

Info

Publication number: CN114128327B
Application number: CN201980098572.9A
Authority: CN
Inventors: 张锦芳; 苏宏家
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2024-06-25
Anticipated expiration: 2039-08-16
Also published as: CN114128327A; WO2021030992A1

Abstract

The application discloses a SFCI sending method and a SFCI sending device, which relate to the technical field of communication, in particular to V2X, intelligent automobiles, automatic driving, intelligent network automobiles and the like. The method comprises the following steps: the first terminal device determines the available PSFCH feedback resources according to the sidestream data sent by the second terminal device, determines the frequency domain resources for sending SFCI according to the available PSFCH feedback resources, the index of the first terminal device and the number of the multiplexing orthogonal code sequences, and sends SFCI to the second terminal device according to the frequency domain resources for sending SFCI; or, the frequency domain resource for transmitting SFCI and the number of repeated transmissions of SFCI are determined according to the available PSFCH feedback resources, the number of receiving members in the multicast group, the index of the first terminal apparatus, and the number of multiplexing orthogonal code sequences, and the transmission is repeated SFCI to the second terminal apparatus according to the frequency domain resource for transmitting SFCI and the number of repeated transmissions of SFCI.

Description

SFCI sending method and SFCI sending device

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a method and a device for transmitting sidestream feedback control information (sidelink feedback control information, SFCI).

Background

In a vehicle-to-everything (V2X) communication system, a side communication may be performed between a terminal device and a terminal device through a direct link (e.g., a Side Link (SL)). In order to improve the efficiency of the sidestream communication, the concept of multicast communication is introduced in the V2X communication system. In multicast communication, a multicast group may include at least two receiving terminals and a transmitting terminal, where the transmitting terminal may transmit sidestream data to a plurality of receiving terminals in the multicast group at the same time through a physical sidestream shared channel (PHYSICAL SIDELINK SHARED CHANNEL, PSSCH) on the SL.

In order to improve reliability of sidestream communication and reduce communication delay, the third generation partnership project (3rd generation partnership project,3GPP) defines a physical sidestream feedback channel (PHYSICAL SIDELINK feedback channel, PSFCH) for the sidestream link, and PSFCH may be used to send an SFCI, where the SFCI may at least include information that a receiving terminal feeds back whether sidestream data is successfully received to a sending terminal. For example, after the transmitting terminal transmits the sidestream data to the receiving terminal through the PSSCH, the receiving terminal may transmit SFCI to the transmitting terminal on PSFCH channels according to the receiving condition of the sidestream data; after receiving SFCI, the sending terminal can select a proper sidestream communication resource to reschedule sidestream data or new sidestream data according to SFCI, so as to improve the sending success rate of the sidestream data, further improve the reliability of sidestream communication and reduce communication time delay.

However, in the prior art, in the multicast communication scenario of the V2X communication system, how a plurality of receiving terminals transmit SFCI to the transmitting terminal on the same feedback resource has not been specified, which affects the feedback SFCI from the transmitting terminal to the receiving terminal.

Disclosure of Invention

The embodiment of the application provides a SFCI sending method and a SFCI sending device, which solve the problem that a plurality of receiving terminals send SFCI under multicast communication.

In order to achieve the above purpose, the embodiment of the application adopts the following technical scheme:

In a first aspect, a method for transmitting SFCI is provided, which may include: the first terminal device receives sidestream data comprising M first resource units from the second terminal device, determines available PSFCH feedback resources comprising P second resource units according to transmission resources of the received sidestream data, determines frequency domain resources for transmitting SFCI according to the available PSFCH feedback resources, indexes U _index of the first terminal device and the number of multiplexing orthogonal code sequences in the X second resource units, and transmits SFCI to the second terminal device according to the frequency domain resources for transmitting SFCI; x is the number of second resource units required for transmission SFCI, and X is an integer greater than or equal to 1; SFCI is used to at least indicate whether the first terminal device is correctly receiving sidestream data.

Based on the method of the first aspect, after the first terminal device in the multicast group determines the available PSFCH feedback resources according to the received transmission resources of the sidestream data, the first terminal device determines the starting position and the bandwidth of the frequency domain of the available PSFCH feedback resources of SFCI sent by the first terminal device to the second terminal device and sends SFCI the orthogonal code sequences used by SFCI through the index of the first terminal device, the size of the resource unit needed by sending SFCI once, the available orthogonal code sequences and other information, so as to realize SFCI feedback, especially ACK/NACK feedback, of a plurality of first terminal devices in multicast communication, and solve the problem that the frequency domain resources cannot be determined for SFCI fed back by the terminal device in the multicast communication scene.

In a possible design, with reference to the first aspect, the frequency domain resource for transmitting SFCI includes a frequency domain starting position of the frequency domain resource for transmitting SFCI, and the first terminal device determines the frequency domain resource for transmitting SFCI according to the available PSFCH feedback resource, the index U _index of the first terminal device, and the number of multiplexing orthogonal code sequences in X second resource units, including: the first terminal device determines the number K of terminal devices capable of transmitting SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of the orthogonal code sequences required for transmitting SFCI; determining a frequency domain starting position of a frequency domain resource for transmitting SFCI as a PSFCH feedback resource available based on an index U _index of the first terminal device and the number K of terminal devices capable of transmitting SFCI in X second resource unitsAnd a second resource unit. Based on this possible design, the frequency domain starting position of the frequency domain resource for transmission SFCI may be determined according to the index of the first terminal device, the size of the resource element required for transmission SFCI and the available orthogonal code sequence.

In one possible design, with reference to any one of the possible designs of the first aspect, the first terminal device sends SFCI to the second terminal device according to the frequency domain resource used for sending SFCI, including: at the firstThe first X second resource units are sent SFCI to the second terminal device through one PSFCH. Based on this possible design, the first terminal device may send SFCI to the second terminal device once on PSFCH feedback resources so that multiple terminals in the multicast group send their own SFCI multiplexed at PSFCH feedback resources to the second terminal device together.

In one possible design, in combination with the first aspect or any one of the possible designs of the first aspect, the method further includes: the first terminal apparatus determines an orthogonal code sequence having an index mod (2×u _index +1, L) and an orthogonal code sequence having an index mod (2×u _index, L) as an orthogonal code sequence required for transmission SFCI based on the index U _index of the first terminal apparatus and the number L of the orthogonal code sequences that can be multiplexed in the X second resource elements. Based on this possible design, the orthogonal code sequence used by SFCI to send the first terminal device feedback is determined from the index of the first terminal device so that the terminals in the multicast group use different orthogonal code sequences to feed back SFCI to the second terminal device.

In one possible design, with reference to the first aspect or any one of the possible designs of the first aspect, the index U _index of the first terminal device is preconfigured; or the index U _index of the first terminal device is notified to the first terminal device by the second terminal device; or the index U _index of the first terminal device is determined according to SFCI of the receiving member of the multicast group. Based on the possible design, the index of the terminal device can be obtained in various modes, and the implementation modes are flexible and various.

In a second aspect, the present application provides a terminal device, which may be the first terminal device or a chip or a system on a chip in the first terminal device, and may be a functional module in the first terminal device for implementing the method of the first aspect or any of the possible designs of the first aspect. The terminal device may implement the functions performed by the first terminal device in the above aspects or in each possible design, which may be implemented by hardware executing corresponding software. The hardware or software comprises one or more modules corresponding to the functions. Such as: the terminal device includes: a receiving unit, a processing unit and a transmitting unit.

A receiving unit configured to receive sidestream data from a second terminal device; the transmission resource of the sidestream data comprises M first resource units, wherein M is a positive integer.

The processing unit is used for determining available PSFCH feedback resources according to transmission resources of the sidestream data; the PSFCH feedback resources available include P second resource units; determining a frequency domain resource for transmitting SFCI according to the available PSFCH feedback resources, the index U _index of the first terminal device and the number of the multiplexing orthogonal code sequences in the X second resource units; x is the number of second resource units needed for transmission SFCI; SFCI is used to at least indicate whether the first terminal device is correctly receiving sidestream data.

A transmitting unit, configured to transmit SFCI to the second terminal device according to the frequency domain resource used for transmitting SFCI.

In this embodiment, the specific implementation manner of the terminal device may refer to the behavior function of the first terminal device in the transmission method of SFCI provided by the first aspect or any one of possible designs of the first aspect, for example: based on the second aspect, after the first terminal device in the multicast group determines the available PSFCH feedback resources according to the received transmission resources of the sidestream data, the first terminal device determines the frequency domain starting position and the frequency domain bandwidth of the available PSFCH feedback resources and the orthogonal code sequence used for transmitting SFCI of SFCI sent by the first terminal device to the second terminal device through the information such as the index of the first terminal device, the size of the resource unit needed for transmitting once SFCI and the available orthogonal code sequence, so as to realize SFCI feedback, especially ACK/NACK feedback, of a plurality of first terminal devices in multicast communication, and solve the problem that the frequency domain resources cannot be determined for SFCI fed back by the terminal device in the multicast communication scene.

In a possible design, with reference to the second aspect, the frequency domain resource for transmitting SFCI includes a frequency domain start position of the frequency domain resource for transmitting SFCI, and the processing unit is specifically configured to: determining the number K of terminal devices capable of transmitting SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of the orthogonal code sequences required for transmitting SFCI; determining a frequency domain starting position of a frequency domain resource for transmitting SFCI as a PSFCH feedback resource available based on an index U _index of the first terminal device and the number K of terminal devices capable of transmitting SFCI in X second resource unitsAnd a second resource unit. Based on this possible design, the processing unit may determine the frequency domain starting position of the frequency domain resource for transmission SFCI from the index of the first terminal device, the size of the resource unit needed to be transmitted SFCI once, and the available orthogonal code sequences.

In one possible design, with reference to the second aspect or any one of the possible designs of the second aspect, the sending unit is specifically configured to: at the firstThe first X second resource units are sent SFCI to the second terminal device through one PSFCH. Based on this possible design, the sending unit may send SFCI to the second terminal device once on PSFCH feedback resources, so that multiple terminals in the multicast group send their own SFCI multiplexed at PSFCH feedback resources together to the second terminal device.

In one possible design, with reference to the second aspect or any one of the possible designs of the second aspect, the processing unit is further configured to: the orthogonal code sequence required for transmission SFCI is determined to be an orthogonal code sequence with an index mod (2×u _index, L) and an orthogonal code sequence with an index mod (2×u _index +1, L) based on the index U _index of the first terminal device and the number L of the orthogonal code sequences that can be multiplexed in the X second resource elements. Based on this possible design, the processing unit may determine, from the index of the first terminal device, the orthogonal code sequence used by SFCI to send the feedback of the first terminal device, so that the terminals in the multicast group use different orthogonal code sequences to feed back SFCI to the second terminal device.

In one possible design, with reference to the second aspect or any one of the possible designs of the second aspect, the index U _index of the first terminal device is preconfigured; or the index U _index of the first terminal device is notified to the first terminal device by the second terminal device; or the index U _index of the first terminal device is determined according to SFCI of the receiving member of the multicast group. Based on the possible design, the index of the terminal device can be obtained in various modes, and the implementation modes are flexible and various.

In a third aspect, a terminal device is provided, which may be a first terminal device or a chip or a system on chip in a first terminal device. The terminal device may implement the functions performed by the first terminal device in the aspects or in the possible designs, where the functions may be implemented by hardware, for example: in one possible design, the terminal device may include: a processor and a transceiver. The processor receives side line data comprising M first resource units from the second terminal device through the transceiver, and determines available PSFCH feedback resources according to transmission resources of the side line data; the PSFCH feedback resources available include P second resource units; determining a frequency domain resource for transmitting SFCI according to the available PSFCH feedback resources, the index U _index of the first terminal device and the number of the multiplexing orthogonal code sequences in the X second resource units; transmitting SFCI to the second terminal device through the transceiver according to the frequency domain resources for transmitting SFCI; x is the number of second resource units needed for transmission SFCI; SFCI is used to at least indicate whether the first terminal device is correctly receiving sidestream data. In a further possible design, the terminal device may further comprise a memory for storing computer-executable instructions and data necessary for the terminal device. When the terminal device is running, the processor executes the computer-executable instructions stored in the memory to cause the terminal device to perform the transmission method SFCI as described in the first aspect or any one of the possible designs of the first aspect.

In a fourth aspect, a computer readable storage medium is provided, which may be a readable non-volatile storage medium, storing computer instructions or a program, which when run on a computer, cause the computer to perform the transmission method of SFCI of the first aspect or any one of the possible designs of the above aspects.

In a fifth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the transmission method of SFCI of the first aspect or any of the possible designs of the aspects.

In a sixth aspect, a terminal device is provided, which may be a first terminal device or a chip or a system on a chip in a first terminal device, the terminal device comprising one or more processors and one or more memories. The one or more memories are coupled to the one or more processors, the one or more memories being configured to store computer program code comprising computer instructions that, when executed by the one or more processors, cause the terminal device to perform the transmission method of SFCI as described above in the first aspect or any of the possible designs of the first aspect.

The technical effects caused by any design manner of the third aspect to the sixth aspect may be referred to the technical effects caused by any possible design of the first aspect or the first aspect, and will not be described in detail.

In a seventh aspect, there is provided a transmission method of SFCI, the method including: the second terminal device sends side line data comprising M first resource units to the first terminal device, determines available PSFCH feedback resources comprising P second resource units according to transmission resources of the side line data, determines frequency domain resources for sending SFCI according to the available PSFCH feedback resources, indexes U _index of the first terminal device and the number of multiplexing orthogonal code sequences in the X second resource units, and receives SFCI from the first terminal device on the frequency domain resources for sending SFCI; x is the number of second resource units needed for transmission SFCI, SFCI is used to indicate at least whether the first terminal device correctly receives sidestream data.

Based on the method of the seventh aspect, after the second terminal device of the multicast sidestream data in the multicast group determines the available PSFCH feedback resources according to the transmission resources of the sidestream data, the first terminal device determines the starting position and the bandwidth of the frequency domain of the available PSFCH feedback resources of SFCI sent by the first terminal device to the second terminal device and the orthogonal code sequence used by sending SFCI through the index of the first terminal device, the size of the resource unit needed by sending SFCI once, the available orthogonal code sequence and other information, and receives SFCI from the first terminal device according to the determination result, so as to realize SFCI feedback, especially ACK/NACK feedback of a plurality of first terminal devices in multicast communication, thereby solving the problem that the frequency domain resources cannot be determined for SFCI fed back by the terminal device in the multicast communication scene.

In a possible design, with reference to the seventh aspect or any one of the possible designs of the seventh aspect, the frequency domain resource for transmitting SFCI includes a frequency domain start position of the frequency domain resource for transmitting SFCI, and the determining, by the second terminal device, the frequency domain resource for transmitting SFCI according to the available PSFCH feedback resource, the index U _index of the first terminal device, and the number of multiplexing orthogonal code sequences in X second resource units includes: determining the number K of terminal devices capable of transmitting SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of the orthogonal code sequences required for transmitting SFCI; determining a frequency domain starting position of a frequency domain resource for transmitting SFCI as a PSFCH feedback resource available based on an index U _index of the first terminal device and the number K of terminal devices capable of transmitting SFCI in X second resource unitsAnd a second resource unit. Based on this possible design, the frequency domain starting position of the frequency domain resource for transmission SFCI may be determined according to the index of the first terminal device, the size of the resource element required for transmission SFCI and the available orthogonal code sequence.

In one possible design, with reference to the seventh aspect or any one of the possible designs of the seventh aspect, the second terminal device receives SFCI from the first terminal device on a frequency domain resource for transmitting SFCI, including: the second terminal device is at the secondThe first X second resource units are each configured to receive SFCI from the first terminal device via one PSFCH. Based on this possible design, the second terminal device may receive the primary SFCI sent by the first terminal device on PSFCH feedback resources.

In one possible design, with reference to the seventh aspect or any one of the possible designs of the seventh aspect, the method further includes: the second terminal apparatus determines an orthogonal code sequence having an index mod (2×u _index +1, L) and an orthogonal code sequence having an index mod (2×u _index, L) as an orthogonal code sequence required for transmission SFCI based on the index U _index of the first terminal apparatus and the number L of the orthogonal code sequences that can be multiplexed in the X second resource units. Based on this possible design, the orthogonal code sequence used by SFCI to send the first terminal device feedback is determined from the index of the first terminal device so that the terminals in the multicast group use different orthogonal code sequences to feed back SFCI to the second terminal device.

In one possible design, with reference to the seventh aspect or any one of the possible designs of the seventh aspect, the index U _index of the first terminal device is preconfigured; or the index U _index of the first terminal device is configured by the second terminal device; or the index U _index of the first terminal device is determined according to SFCI of the receiving member of the multicast group. Based on the possible design, the index of the terminal device can be obtained in various modes, and the implementation modes are flexible and various.

In an eighth aspect, the present application provides a terminal device, which may be the second terminal device or a chip or a system on a chip in the second terminal device, and may be a functional module in the second terminal device for implementing the method in any one of the seventh aspect or the seventh aspect. The terminal device may implement the functions performed by the second terminal device in the above aspects or in each possible design, which may be implemented by hardware executing corresponding software. The hardware or software comprises one or more modules corresponding to the functions. Such as: the terminal device may include: a transmitting unit, a processing unit, and a receiving unit;

and the sending unit is used for sending the sidestream data comprising M first resource units to the first terminal device.

A receiving unit, configured to receive SFCI from the first terminal device in a frequency domain resource for transmission SFCI.

In a specific implementation manner of the terminal device, reference may be made to the behavior function of the second terminal device in the transmission method of SFCI provided by the seventh aspect or any one of the possible designs of the seventh aspect, and the seventh aspect or any one of the possible designs of the seventh aspect may be implemented by a processing unit and a transmission unit included in the terminal device correspondingly. For example: in the eighth aspect, after determining the available PSFCH feedback resources according to the transmission resources of the sidestream data, the second terminal device determines the frequency domain starting position and the frequency domain bandwidth of the available PSFCH feedback resources and the orthogonal code sequence used for transmitting SFCI of SFCI sent by the first terminal device to the second terminal device by using the index of the first terminal device, the size of the resource unit needed for transmitting SFCI, the available orthogonal code sequence and other information, and receives SFCI from the first terminal device according to the determination result, thereby realizing SFCI feedback, especially ACK/NACK feedback, of a plurality of first terminal devices in multicast communication, and solving the problem that the frequency domain resources cannot be determined for SFCI fed back by the terminal device in the multicast communication scene in the prior art.

In one possible design, with reference to the seventh aspect, the processing unit is specifically configured to: determining the number K of terminal devices capable of transmitting SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of the orthogonal code sequences required for transmitting SFCI; determining a frequency domain starting position of a frequency domain resource for transmitting SFCI as a PSFCH feedback resource available based on an index U _index of the first terminal device and the number K of terminal devices capable of transmitting SFCI in X second resource unitsAnd a second resource unit. Based on this possible design, the processing unit may determine the frequency domain starting position of the frequency domain resource for transmission SFCI from the index of the first terminal device, the size of the resource unit needed to be transmitted SFCI once, and the available orthogonal code sequences.

In one possible design, with reference to the seventh aspect or any one of the possible designs of the seventh aspect, the receiving unit is specifically configured to: at the firstThe first X second resource units are each configured to receive SFCI from the first terminal device via one PSFCH. Based on this possible design, the receiving unit may receive the primary SFCI sent by the first terminal device on PSFCH feedback resources.

In one possible design, with reference to the seventh aspect or any one of the possible designs of the seventh aspect, the processing unit is further configured to determine, according to the index U _index of the first terminal device and the number L of the orthogonal code sequences that can be multiplexed in the X second resource units, that the orthogonal code sequence required for transmitting SFCI is an orthogonal code sequence with an index mod (2×u _index, L) and an orthogonal code sequence with an index mod (2×u _index +1, L). Based on this possible design, the processor may determine, from the index of the first terminal device, the orthogonal code sequence used by SFCI to transmit the first terminal device feedback, such that the terminals in the multicast group use different orthogonal code sequences to feed back SFCI to the second terminal device.

In a ninth aspect, a terminal device is provided, which may be the second terminal device or a chip or a system on chip in the second terminal device. The terminal device may implement the functions performed by the second terminal device in the above aspects or in each possible design, where the functions may be implemented by hardware, for example: in one possible design, the terminal device may include: a processor and a transceiver. The processor sends side line data comprising M first resource units to the first terminal device through the transceiver, and determines available PSFCH feedback resources according to transmission resources of the side line data; the PSFCH feedback resources available include P second resource units; and determining a frequency domain resource for transmitting SFCI according to the available PSFCH feedback resources, the index U _index of the first terminal device, the number of the multiplexing orthogonal code sequences in the X second resource units, and receiving SFCI from the first terminal device through the transceiver at the frequency domain resource for transmitting SFCI; x is the number of second resource units needed for transmission SFCI; SFCI is used to at least indicate whether the first terminal device is correctly receiving sidestream data. In a further possible design, the terminal device may further comprise a memory for storing computer-executable instructions and data necessary for the terminal device. When the terminal device is running, the processor executes the computer-executable instructions stored in the memory to cause the terminal device to perform the transmission method SFCI as described in the seventh aspect or any one of the possible designs of the seventh aspect.

In a tenth aspect, there is provided a computer readable storage medium, which may be a readable non-volatile storage medium, storing computer instructions which, when run on a computer, cause the computer to perform the transmission method of SFCI of the seventh aspect or any one of the possible designs of the above aspects.

In an eleventh aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the transmission method of SFCI of the seventh aspect or any one of the possible designs of the aspects.

In a twelfth aspect, a terminal device is provided, which may be a second terminal device or a chip or a system on a chip in a second terminal device, the terminal device comprising one or more processors and one or more memories. The one or more memories are coupled to the one or more processors, the one or more memories are configured to store computer program code, the computer program code including computer instructions that, when executed by the one or more processors, cause the terminal device to perform the transmission method of SFCI as described in the seventh aspect or any of the possible designs of the seventh aspect.

The technical effects of any one of the designs of the ninth aspect to the twelfth aspect may be referred to the technical effects of any one of the possible designs of the seventh aspect or the seventh aspect, and will not be described in detail.

In a thirteenth aspect, a transmission method of SFCI is provided, which may include: the first terminal device receives sidestream data comprising M first resource units from the second terminal device, determines available PSFCH feedback resources comprising P second resource units according to transmission resources of the received sidestream data, determines frequency domain resources for transmitting SFCI and the repeated transmission times of SFCI according to available PSFCH feedback resources, the number Q of receiving members in a multicast group, the index U _index of the first terminal device and the number of multiplexing orthogonal code sequences in X second resource units, and repeatedly transmits SFCI to the second terminal device according to the frequency domain resources for transmitting SFCI and the repeated transmission times of SFCI; x is the number of second resource units required for transmission SFCI, and X is an integer greater than or equal to 1; SFCI is used to at least indicate whether the first terminal device is correctly receiving sidestream data.

Based on the method of the thirteenth aspect, after the first terminal device in the multicast group determines the available PSFCH feedback resources according to the received transmission resources of the sidestream data, the first terminal device determines the starting position and the bandwidth of the frequency domain of the available PSFCH feedback resources of SFCI sent by the first terminal device to the second terminal device and the orthogonal code sequence used by sending SFCI through the index of the terminal device, the size of the resource unit needed by sending SFCI once, the available orthogonal code sequence, the number of receiving members in the multicast group and other information, so as to realize SFCI feedback, especially ACK/NACK feedback, of a plurality of first terminal devices in multicast communication, thereby solving the problem that the frequency domain resources cannot be determined for SFCI fed back by the terminal device in the multicast communication scene. Meanwhile, the transmission reliability is improved by repeatedly sending SFCI to the sending terminal by utilizing PSFCH feedback resources, and in addition, the power influence can be further reduced by occupying continuous frequency domain resources when the transmission is repeated SFCI, so that the transmission reliability is improved by SFCI.

In a possible design, with reference to the thirteenth aspect, the frequency domain resource for transmitting SFCI includes a frequency domain start position of the frequency domain resource for transmitting SFCI, and the first terminal device determines, according to the available PSFCH feedback resource, the number Q of receiving members in the multicast group, the index U _index of the first terminal device, the number of multiplexing orthogonal code sequences in X second resource units, the frequency domain resource for transmitting SFCI, and the number of repeated transmissions of SFCI, including: the first terminal device determines the number K of terminal devices capable of transmitting SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of orthogonal codes required for transmitting SFCI; determining the number of second resource units needed by all receiving members to send SFCI to the second terminal device according to the number Q of receiving members in the multicast group and the number K of terminal devices capable of transmitting SFCI in X second resource unitsDetermining the minimum number of times/>, on the available PSFCH feedback resources, that all receiving members can repeatedly send SFCI to the second terminal device according to the number P and S of second resource units of the available PSFCH feedback resourcesAnd the number re=mod (P, S) of redundant second resource units in the available PSFCH feedback resources; based on the index U _index of the first terminal device and the number K of terminal devices that can transmit SFCI in X second resource units, the logical index for determining the frequency domain starting position of the frequency domain resource for transmitting SFCI is: i=If i < Re, determining that the frequency domain starting position of the frequency domain resource for transmitting SFCI is the ith× (rp+1) ×x second resource units of the available PSFCH feedback resource, and the number of repeated transmissions of SFCI is rp+1; if i > Re, the frequency domain start position of the frequency domain resource for transmission SFCI is determined to be the (Re× (Rp+1) + (i-Re) ×Rp) ×X second resource units of the PSFCH feedback resource available, and the number of repeated transmissions of SFCI is Rp. Based on this possible design, the frequency domain starting position of the frequency domain resource for transmitting SFCI and the number of repeated transmissions of SFCI may be determined according to the index of the first terminal device, the size of the resource unit required for transmitting SFCI once, the number of receiving members in the multicast group, and the available orthogonal code sequences, so that the terminals in the multiple multicast groups repeatedly feed back SFCI to the second terminal device using different orthogonal code sequences.

In one possible design, with reference to any one of the possible designs of the thirteenth aspect, the first terminal device repeatedly sends SFCI to the second terminal device according to the frequency domain starting position of the frequency domain resource and the number of repeated sending times SFCI, including: if i < Re, the first terminal apparatus transmits (rp+1) times SFCI to the second terminal apparatus through one PSFCH on (rp+1) X second resource units starting with the (rp+1) X second resource units; if i > =re, the first terminal apparatus transmits Rp SFCI to the second terminal apparatus via one PSFCH on rp×x second resource units starting from (re× (rp+1) + (i-Re) ×rp) ×x second resource units. Based on this possible design, the first terminal device may repeat the transmission to the second terminal device multiple times SFCI on PSFCH feedback resources, improving the transmission reliability of SFCI.

In one possible design, with reference to the thirteenth aspect or any one of the possible designs of the thirteenth aspect, the method further includes: the first terminal apparatus determines an orthogonal code sequence having an index mod (2×u _index +1, L) and an orthogonal code sequence having an index mod (2×u _index, L) as an orthogonal code sequence required for transmission SFCI based on the index U _index of the first terminal apparatus and the number L of the orthogonal code sequences that can be multiplexed in the X second resource elements. Based on this possible design, the orthogonal code sequence used by SFCI to send the first terminal device feedback is determined from the index of the first terminal device so that the terminals in the multicast group use different orthogonal code sequences to feed back SFCI to the second terminal device.

In one possible design, with reference to the thirteenth aspect or any one of the possible designs of the thirteenth aspect, the index U _index of the first terminal device is preconfigured; or the index U _index of the first terminal device is notified to the first terminal device by the second terminal device; or the index U _index of the first terminal device is determined according to SFCI of the receiving member of the multicast group. Based on the possible design, the index of the terminal device can be obtained in various modes, and the implementation modes are flexible and various.

In one possible design, with reference to the thirteenth aspect or any one of the possible designs of the thirteenth aspect, the number of receiving members in the multicast group is notified to the first terminal device by the second terminal device. Based on the possible design, the first terminal device can obtain the number of receiving members in the multicast group from the second terminal device, and the method is simple and easy to implement.

In a fourteenth aspect, the present application provides a terminal device, which may be the first terminal device or a chip or a system on a chip in the first terminal device, and may be a functional module in the first terminal device for implementing the method of any one of the thirteenth aspect or the thirteenth aspect. The terminal device may implement the functions performed by the first terminal device in the above aspects or in each possible design, which may be implemented by hardware executing corresponding software. The hardware or software comprises one or more modules corresponding to the functions. Such as: the terminal device includes: a receiving unit, a processing unit and a transmitting unit.

And a receiving unit configured to receive sidestream data including M first resource units from the second terminal apparatus.

A processing unit, configured to determine an available PSFCH feedback resource including P second resource units according to a transmission resource of the received sidestream data, and determine a frequency domain resource used for transmitting SFCI and a number of repeated transmissions of SFCI according to the available PSFCH feedback resource, a number Q of receiving members in the multicast group, an index U _index of the first terminal device, and a number of multiplexing orthogonal code sequences in the X second resource units; x is the number of second resource units needed for transmission SFCI; SFCI is used to at least indicate whether the first terminal device is correctly receiving sidestream data.

A transmitting unit configured to repeatedly transmit SFCI to the second terminal apparatus according to the frequency domain resource used for transmission SFCI and the number of repeated transmissions of SFCI.

In a specific implementation manner of the terminal device, reference may be made to the behavior function of the first terminal device in the transmission method of SFCI provided by the thirteenth aspect or any one of the possible designs of the thirteenth aspect, and any one of the possible designs of the thirteenth aspect or the thirteenth aspect may be implemented by a processing unit and a transmission unit included in the terminal device, which are not repeated herein. Thus, the terminal device can achieve the same advantageous effects as the thirteenth aspect or any one of the possible designs of the thirteenth aspect.

In a possible design, with reference to the thirteenth aspect, the frequency domain resource for transmitting SFCI includes a frequency domain start position of the frequency domain resource for transmitting SFCI; the processing unit is specifically used for: determining the number K of terminal devices capable of transmitting SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of the orthogonal codes required for transmitting SFCI; determining the number of second resource units needed by all receiving members to send SFCI to the second terminal device according to the number Q of receiving members in the multicast group and the number K of terminal devices capable of transmitting SFCI in X second resource unitsDetermining the minimum number of times/>, on the available PSFCH feedback resources, that all receiving members can repeatedly send SFCI to the second terminal device according to the number P and S of second resource units of the available PSFCH feedback resourcesAnd the number re=mod (P, S) of redundant second resource units in the available PSFCH feedback resources; based on the index U _index of the first terminal device and the number K of terminal devices that can transmit SFCI in X second resource units, the logical index for determining the frequency domain starting position of the frequency domain resource for transmitting SFCI is: /(I)If i < Re, determining that the frequency domain starting position of the frequency domain resource for transmitting SFCI is the ith× (rp+1) ×x second resource units of the available PSFCH feedback resource, and the number of repeated transmissions of SFCI is rp+1; if i > =re, the frequency domain start position of the frequency domain resource for transmission SFCI is determined to be the (re× (rp+1) + (i-Re) ×rp) ×x second resource units of the available PSFCH feedback resource, and the number of repeated transmissions of SFCI is Rp. Based on this possible design, the processing unit may determine the frequency domain starting position of the frequency domain resource for transmitting SFCI and the number of repeated transmissions of SFCI according to the index of the first terminal device, the size of the resource unit required for transmitting SFCI once, the number of receiving members in the multicast group, and the available orthogonal code sequences, so that the terminals in the multiple multicast groups repeatedly feed back SFCI to the second terminal device using different orthogonal code sequences.

In one possible design, with reference to the thirteenth aspect or any one of the possible designs of the thirteenth aspect, the transmitting unit is specifically configured to: if i < Re, (rp+1) times SFCI are transmitted to the second terminal apparatus through one PSFCH on (rp+1) X second resource units starting from the (rp+1) X second resource units; if i > =re, rp is transmitted SFCI times to the second terminal apparatus via one PSFCH on rp×x second resource units starting from (re× (rp+1) + (i-Re) ×rp) ×x second resource units. Based on this possible design, the sending unit may repeat sending SFCI to the second terminal device multiple times on PSFCH feedback resources, improving the transmission reliability of SFCI.

In a possible design, with reference to the thirteenth aspect or any one of the possible designs of the thirteenth aspect, the processing unit is further configured to determine, according to the index U _index of the first terminal device and the number L of the orthogonal code sequences that can be multiplexed in the X second resource units, that the orthogonal code sequence required for transmitting SFCI is an orthogonal code sequence with an index mod (2×u _index, L) and an orthogonal code sequence with an index mod (2×u _index +1, L). Based on this possible design, the orthogonal code sequence used by SFCI to send the first terminal device feedback is determined from the index of the first terminal device so that the terminals in the multicast group use different orthogonal code sequences to feed back SFCI to the second terminal device.

In a fifteenth aspect, a terminal device is provided, which may be a first terminal device or a chip or a system on chip in a first terminal device. The terminal device may implement the functions performed by the first terminal device in the aspects or in the possible designs, where the functions may be implemented by hardware, for example: in one possible design, the terminal device may include: a processor and a transceiver. The processor receives sidestream data comprising M first resource units from the second terminal device through the transceiver, determines available PSFCH feedback resources comprising P second resource units according to transmission resources of the received sidestream data, and determines frequency domain resources for transmitting SFCI and repeated transmission times of SFCI according to available PSFCH feedback resources, the number Q of receiving members in a multicast group, the index U _index of the first terminal device and the number of multiplexing orthogonal code sequences in the X second resource units; transmitting SFCI to the second terminal apparatus through the transceiver according to the frequency domain resource for transmission SFCI and the number of repeated transmissions of SFCI; x is the number of second resource units needed for transmission SFCI; SFCI is used to at least indicate whether the first terminal device is correctly receiving sidestream data. In a further possible design, the terminal device may further comprise a memory for storing computer-executable instructions and data necessary for the terminal device. When the terminal device is running, the processor executes the computer-executable instructions stored in the memory to cause the terminal device to perform the transmission method SFCI as described in the thirteenth aspect or any one of the possible designs of the thirteenth aspect.

In a sixteenth aspect, there is provided a computer readable storage medium, which may be a readable non-volatile storage medium, the computer readable storage medium storing computer instructions which, when run on a computer, cause the computer to perform the transmission method of SFCI of the thirteenth aspect or any one of the possible designs of the above aspects.

In a seventeenth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the transmission method of SFCI of the thirteenth aspect or any of the possible designs of the aspects.

In an eighteenth aspect, a terminal device is provided, which may be a first terminal device or a chip or a system on a chip in a first terminal device, the terminal device comprising one or more processors and one or more memories. The one or more memories are coupled to the one or more processors, the one or more memories are configured to store computer program code, the computer program code including computer instructions that, when executed by the one or more processors, cause the terminal device to perform the transmission method of SFCI as described in the thirteenth aspect or any of the possible designs of the thirteenth aspect.

The technical effects brought by any one of the designs of the fifteenth aspect to the eighteenth aspect may be referred to the technical effects brought by any one of the foregoing thirteenth aspect or any one of the possible designs of the thirteenth aspect, and will not be described in detail.

In a nineteenth aspect, there is provided a transmitting method of SFCI, the method including: the second terminal device sends side line data comprising M first resource units to the first terminal device, determines available PSFCH feedback resources comprising P second resource units according to transmission resources of the side line data, and determines frequency domain resources for sending SFCI and the repeated sending times of SFCI according to the available PSFCH feedback resources, the number Q of receiving members in a multicast group, the index U _index of the first terminal device and the number of multiplexing orthogonal code sequences in X second resource units, and receives SFCI repeatedly sent by the first terminal device on the frequency domain resources for sending SFCI; x is the number of second resource units needed for transmission SFCI, SFCI is used to indicate at least whether the first terminal device correctly receives sidestream data.

Based on the method of the nineteenth aspect, after determining the available PSFCH feedback resources according to the transmission resources of the side data by the second terminal device of the multicast side data in the multicast group, the first terminal device determines the starting position and the bandwidth of the frequency domain of the available PSFCH feedback resources of SFCI sent by the first terminal device to the second terminal device and the orthogonal code sequence used by the sending SFCI by the information such as the index of the terminal device, the size of the resource unit needed for sending SFCI once, the available orthogonal code sequence and the number of receiving members in the multicast group, and receives SFCI from the first terminal device according to the determination result, so as to realize SFCI feedback, especially ACK/NACK feedback of a plurality of first terminal devices in the multicast communication, thereby solving the problem that the frequency domain resources cannot be determined for SFCI which is fed back by the terminal device in the multicast communication scene. Meanwhile, the transmission reliability is improved by the sending terminal repeatedly sending SFCI, and in addition, the power influence can be further reduced by occupying continuous frequency domain resources when the transmission is repeated SFCI, so that the transmission reliability of SFCI is improved.

In one possible design, with reference to the nineteenth aspect or any one of the possible designs of the nineteenth aspect, the frequency domain resource used for transmitting SFCI includes a frequency domain starting position of the frequency domain resource used for transmitting SFCI, and the second terminal device determines, according to the available PSFCH feedback resource, the number Q of receiving members in the multicast group, the index U _index of the first terminal device, the number of multiplexing orthogonal code sequences in X second resource units, and the number of repeated transmissions of the frequency domain resource used for transmitting SFCI and SFCI, including: determining the number K of terminal devices capable of transmitting SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of the orthogonal codes required for transmitting SFCI; determining the number of second resource units needed by all receiving members to send SFCI to the second terminal device according to the number Q of receiving members in the multicast group and the number K of terminal devices capable of transmitting SFCI in X second resource unitsDetermining the minimum number of times/>, on the available PSFCH feedback resources, that all receiving members can repeatedly send SFCI to the second terminal device according to the number P and S of second resource units of the available PSFCH feedback resourcesAnd the number re=mod (P, S) of redundant second resource units in the available PSFCH feedback resources; based on the index U _index of the first terminal device and the number K of terminal devices that can transmit SFCI in X second resource units, the logical index for determining the frequency domain starting position of the frequency domain resource for transmitting SFCI is: /(I)If i < Re, determining that the frequency domain starting position of the frequency domain resource for transmitting SFCI is the ith× (rp+1) ×x second resource units of the available PSFCH feedback resource, and the number of repeated transmissions of SFCI is rp+1; if i > Re, the frequency domain start position of the frequency domain resource for transmission SFCI is determined to be the (Re× (Rp+1) + (i-Re) ×Rp) ×X second resource units of the PSFCH feedback resource available, and the number of repeated transmissions of SFCI is Rp. Based on this possible design, the frequency domain starting position of the frequency domain resource for transmission SFCI may be determined according to the index of the first terminal device, the size of the resource unit needed to transmit SFCI once, the number of receiving members in the multicast group, and the available orthogonal code sequences.

In one possible design, with reference to the nineteenth aspect or any one of the possible designs of the nineteenth aspect, the second terminal device receives SFCI a duplicate transmission from the first terminal device on a frequency domain resource used for the transmission SFCI, including: if i < Re, the second terminal device receives rp+1 times SFCI repeatedly transmitted by the first terminal device through one PSFCH on X second resource units starting with the ith X (rp+1) X second resource units; if i > =re, on rp×x second resource units starting from (re× (rp+1) + (i-Re) ×rp) ×x second resource units, rp times SFCI, which are repeatedly transmitted by the first terminal apparatus, are received through one PSFCH. Based on this possible design, the second terminal device may receive multiple repetitions SFCI of the first terminal device's transmission on PSFCH feedback resources.

In one possible design, with reference to the nineteenth aspect or any one of the possible designs of the nineteenth aspect, the method further includes: the second terminal apparatus determines an orthogonal code sequence having an index mod (2×u _index +1, L) and an orthogonal code sequence having an index mod (2×u _index, L) as an orthogonal code sequence required for transmission SFCI based on the index U _index of the first terminal apparatus and the number L of the orthogonal code sequences that can be multiplexed in the X second resource units. Based on this possible design, the orthogonal code sequence used by SFCI to send the first terminal device feedback is determined from the index of the first terminal device so that the terminals in the multicast group use different orthogonal code sequences to feed back SFCI to the second terminal device.

In one possible design, with reference to the nineteenth aspect or any one of the possible designs of the nineteenth aspect, the index U _index of the first terminal device is preconfigured; or the index U _index of the first terminal device is configured by the second terminal device; or the index U _index of the first terminal device is determined according to SFCI of the receiving member of the multicast group. Based on the possible design, the index of the terminal device can be obtained in various modes, and the implementation modes are flexible and various.

In a twentieth aspect, the present application provides a terminal device, which may be the second terminal device or a chip or a system on a chip in the second terminal device, and may be a functional module in the second terminal device for implementing the method of any one of the nineteenth aspect or the nineteenth aspect. The terminal device may implement the functions performed by the second terminal device in the above aspects or in each possible design, which may be implemented by hardware executing corresponding software. The hardware or software comprises one or more modules corresponding to the functions. Such as: the terminal device may include: a transmitting unit, a processing unit, and a receiving unit;

A processing unit, configured to determine, according to the available PSFCH feedback resources, the number Q of receiving members in the multicast group, the index U _index of the first terminal device, and the number of multiplexing orthogonal code sequences in the X second resource units, a frequency domain resource for transmitting SFCI and the number of repeated transmissions of SFCI; x is the number of second resource units needed for transmission SFCI; SFCI is used to at least indicate whether the first terminal device is correctly receiving sidestream data.

A receiving unit, configured to receive SFCI that the first terminal device repeatedly sends in the frequency domain resource used for sending SFCI.

In a specific implementation manner of the terminal device, reference may be made to a behavior function of the second terminal device in the transmission method of SFCI provided by the nineteenth aspect or any one of possible designs of the nineteenth aspect, and any one of possible designs of the nineteenth aspect or any one of possible designs of the nineteenth aspect may be implemented correspondingly by a processing unit and a transmission unit included in the terminal device, which are not repeated herein. Therefore, the terminal device can achieve the same advantageous effects as the nineteenth aspect or any one of the possible designs of the nineteenth aspect.

In a possible design, with reference to the nineteenth aspect, the frequency domain resources for transmitting SFCI include a frequency domain starting position of the frequency domain resources for transmitting SFCI; the processing unit is specifically used for: determining the number K of terminal devices capable of transmitting SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of the orthogonal codes required for transmitting SFCI; determining the number of second resource units needed by all receiving members to send SFCI to the second terminal device according to the number Q of receiving members in the multicast group and the number K of terminal devices capable of transmitting SFCI in X second resource unitsDetermining the minimum number of times/>, on the available PSFCH feedback resources, that all receiving members can repeatedly send SFCI to the second terminal device according to the number P and S of second resource units of the available PSFCH feedback resourcesAnd the number re=mod (P, S) of redundant second resource units in the available PSFCH feedback resources; based on the index U _index of the first terminal device and the number K of terminal devices that can transmit SFCI in X second resource units, the logical index for determining the frequency domain starting position of the frequency domain resource for transmitting SFCI is: /(I)If i < Re, determining that the frequency domain starting position of the frequency domain resource for transmitting SFCI is the ith× (rp+1) ×x second resource units of the available PSFCH feedback resource, and the number of repeated transmissions of SFCI is rp+1; if i > =re, the frequency domain start position of the frequency domain resource for transmission SFCI is determined to be the (re× (rp+1) + (i-Re) ×rp) ×x second resource units of the available PSFCH feedback resource, and the number of repeated transmissions of SFCI is Rp. Based on this possible design, the processing unit determines the frequency domain starting position of the frequency domain resource for transmission SFCI from the index of the first terminal device, the size of the resource unit needed to transmit SFCI once, the number of receiving members in the multicast group, and the available orthogonal code sequences.

In one possible design, with reference to the nineteenth aspect or any one of the possible designs of the nineteenth aspect, the transmitting unit is specifically configured to: if i < Re, (rp+1) times SFCI transmitted by the first terminal device is received by one PSFCH on (rp+1) X second resource units starting with the (rp+1) X second resource units; if i > =re, on rp×x second resource units starting from (re× (rp+1) + (i-Re) ×rp) ×x second resource units, rp times SFCI transmitted by the first terminal apparatus is received through one PSFCH. Based on this possible design, the receiving unit may receive SFCI multiple times the first terminal device repeatedly transmits on PSFCH feedback resources.

In one possible design, with reference to the nineteenth aspect or any one of the possible designs of the nineteenth aspect, the processing unit is further configured to determine, according to the index U _index of the first terminal device and the number L of the orthogonal code sequences that can be multiplexed in the X second resource units, that the received orthogonal code sequence used by SFCI is an orthogonal code sequence with an index mod (2×u _index, L) and an orthogonal code sequence with an index mod (2×u _index +1, L). Based on this possible design, the processing unit may determine, from the index of the first terminal device, the orthogonal code sequence used by SFCI to send the feedback of the first terminal device, so that the terminals in the multicast group use different orthogonal code sequences to feed back SFCI to the second terminal device.

In a twenty-first aspect, a terminal device is provided, which may be the second terminal device or a chip or a system on chip in the second terminal device. The terminal device may implement the functions performed by the second terminal device in the above aspects or in each possible design, where the functions may be implemented by hardware, for example: in one possible design, the terminal device may include: a processor and a transceiver. The processor sends side line data comprising M first resource units to the first terminal device through the transceiver, and determines available PSFCH feedback resources according to transmission resources of the side line data; the PSFCH feedback resources available include P second resource units; and determining a frequency domain resource for transmitting SFCI and a number of repeated transmissions SFCI according to the available PSFCH feedback resources, the number Q of receiving members in the multicast group, the index U _index of the first terminal device, and the number of multiplexing orthogonal code sequences in the X second resource units, and receiving SFCI repeated transmissions of the first terminal device by the transceiver in the frequency domain resource for transmitting SFCI; x is the number of second resource units needed for transmission SFCI; SFCI is used to at least indicate whether the first terminal device is correctly receiving sidestream data. In a further possible design, the terminal device may further comprise a memory for storing computer-executable instructions and data necessary for the terminal device. When the terminal device is running, the processor executes the computer-executable instructions stored in the memory to cause the terminal device to perform the transmission method SFCI as described in the nineteenth aspect or any one of the possible designs of the nineteenth aspect.

In a twenty-second aspect, there is provided a computer readable storage medium, which may be a readable non-volatile storage medium, storing computer instructions that when run on a computer, cause the computer to perform the transmission method of SFCI of the nineteenth aspect or any of the possible designs of the above aspects.

In a twenty-third aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the transmission method of SFCI of the nineteenth aspect or any of the possible designs of the aspects.

In a twenty-fourth aspect, a terminal device is provided, which may be a second terminal device or a chip or a system on chip in a second terminal device, the terminal device comprising one or more processors and one or more memories. The one or more memories are coupled to the one or more processors, the one or more memories are configured to store computer program code, the computer program code including computer instructions that, when executed by the one or more processors, cause the terminal device to perform the transmission method of SFCI as described in the nineteenth aspect or any of the possible designs of the nineteenth aspect.

The technical effects caused by any design manner of the first aspect to the twenty-fourth aspect may be referred to the technical effects caused by the nineteenth aspect or any possible design of the nineteenth aspect, and are not repeated.

In a twenty-fifth aspect, an embodiment of the present application provides a transmission system SFCI, which includes the first terminal device according to any one of the second to sixth aspects and the second terminal device according to any one of the eighth to twelfth aspects; or the system comprises a first terminal device according to any of the fourteenth to eighteenth aspects and a second terminal device according to any of the twentieth to twenty-fourth aspects.

Drawings

Fig. 1 is a simplified schematic diagram of a communication system according to an embodiment of the present application;

fig. 2 is a schematic diagram of a transmission SFCI in a unicast communication scenario;

Fig. 3 is a schematic diagram of a terminal device according to an embodiment of the present application;

Fig. 4 is a flowchart of a transmission method SFCI according to an embodiment of the present application;

fig. 5 is a schematic diagram of a transmission SFCI in a multicast communication scenario provided in an embodiment of the present application;

Fig. 6a is a schematic diagram of a feedback resource in short format PSFCH according to an embodiment of the present application;

Fig. 6b is a schematic diagram of a feedback resource in short format PSFCH according to an embodiment of the present application;

Fig. 6c is a schematic diagram of a feedback resource in long format PSFCH according to an embodiment of the present application;

fig. 7a is a schematic diagram of acquiring an index of a terminal device according to an embodiment of the present application;

Fig. 7b is a schematic diagram of still another method for obtaining an index of a terminal device according to an embodiment of the present application;

fig. 8 is a flowchart of another transmission method SFCI according to an embodiment of the present application;

Fig. 9 is a further schematic diagram of a transmission SFCI in a multicast communication scenario provided in an embodiment of the present application;

fig. 10 is a schematic diagram of a composition of a terminal device 110 according to an embodiment of the present application;

Fig. 11 is a schematic diagram of a composition of a terminal device 120 according to an embodiment of the present application;

Fig. 12 is a schematic diagram of a communication system according to an embodiment of the present application.

Detailed Description

The following describes embodiments of the present application in detail with reference to the drawings.

The transmission method SFCI provided in the embodiment of the present application may be used in any communication system supporting sidelink (sidelink) communication, which may be a third generation partnership project (3rd generation partnership project,3GPP) communication system, for example, a long term evolution (long term evolution, LTE) system, or may be a fifth generation (5th generation,5G) mobile communication system, a New Radio (NR) system, a NR-car-to-everything, a V2X system, or other next generation communication system, or may be a non-3 GPP communication system, without limitation. The method provided by the embodiment of the present application will be described below by taking fig. 1 as an example.

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application, and as shown in fig. 1, the communication system may include a plurality of terminal apparatuses and a network device. The terminal device may be located within the cell coverage of the network device, or may be located outside the cell coverage of the network device. The terminal device may communicate with the network equipment through a Uu port, or may communicate with other terminal devices through a Sidelink (SL) (or a PC5 port). The terminal device may communicate with other terminal devices one-to-one by a unicast scheme, or may perform multicast communication with other terminal devices by a multicast scheme (or referred to as a multicast scheme). For example, as shown in fig. 1, the terminal device 1 may perform unicast communication with the terminal device 2, and transmit side line data to the terminal device 2 by a unicast scheme. The terminal device 1 may be one multicast group with the other three terminal devices (terminal device 3, terminal device 4, terminal device 5), and the terminal device 1 may transmit the side data to the terminal device 3, terminal device 4, terminal device 5 by the multicast system.

The network device in fig. 1 may be any device with a radio transceiver function, and is mainly used for implementing a radio physical control function, a resource scheduling function, a radio resource management function, a radio access control function, a mobility management function, and the like. Specifically, the network device may be AN Access Network (AN)/radio access network (radio access network, RAN) device, or may be a device composed of a plurality of 5G-AN/5G-RAN nodes, or may be any node of a base station (nodeB, NB), AN evolved nodeB (eNB), a next generation nodeB (gNB), a transceiver point (transmission receive point, TRP), a transmission point (transmission point, TP), a roadside unit (RSU), and some other access node, without limitation.

The terminal device (terminal equipment) in fig. 1 may be referred to as a terminal (terminal) or a User Equipment (UE) or a Mobile Station (MS) or a Mobile Terminal (MT), etc. Specifically, the terminal device in fig. 1 may be a mobile phone (mobile phone), a tablet computer, or a computer with a wireless transceiver function. The terminal may also be a Virtual Reality (VR) terminal, an augmented reality (augmented reality, AR) terminal, a wireless terminal in industrial control, a wireless terminal in unmanned, a wireless terminal in telemedicine, a wireless terminal in smart grid, a wireless terminal in smart city (SMART CITY), a wireless terminal in smart home (smart home), an in-vehicle terminal, a vehicle with vehicle-to-vehicle (V2V) communication capability, an intelligent network connection, etc., without limitation. The terminal device and the network device in the embodiments of the present application may be one or more chips, or may be a System On Chip (SOC) or the like.

It should be noted that fig. 1 is only an exemplary drawing, the number of devices included in fig. 1 is not limited, and the communication architecture may include other devices in addition to the devices shown in fig. 1. In addition, the names of the respective devices in fig. 1 are not limited, and the respective devices may be named as other names in addition to the names shown in fig. 1, without limitation.

In the communication system shown in fig. 1, the terminal apparatus may acquire transmission resources in any of the following modes: 1. the network device configures or schedules the mode (in LTE-V2X or LTE-V2X mode3, in NR-V2X or NR-V2Xmode 1). 2. The terminal apparatus own scheduling mode (in LTE-V2X or LTE-V2X mode4, in NR-V2X or NR-V2X mode 2) may be that the network device allocates a resource pool including a large number of resources to the terminal apparatus, or the terminal apparatus is preconfigured with a resource pool including a large number of resources, and a plurality of terminal apparatuses may select transmission resources required for themselves in the resource pool in a manner of perceiving scheduling or contention by themselves. After the terminal device acquires the transmission resource, the terminal device may send side line data to the receiving end through the physical side line shared channel (PHYSICAL SIDELINK SHARED CHANNEL, PSSCH) on the acquired transmission resource.

In order to improve reliability of data transmission, after receiving the sidestream data, the receiving end may send sidestream feedback control information (sidelink feedback control information, SFCI) to the sending end, where SFCI may at least include determination information that the receiving end feeds back whether to successfully receive the sidestream data to the sending end, and may further include resource channel state information (CHANNEL STATE information, CSI) and/or auxiliary information (receiver UE measured assistance information, RMAI) measured by the receiving end, where after receiving SFCI fed back by the receiving end, the sending end may newly transmit data or retransmit data according to SFCI fed back by the receiving end, so as to improve reliability of data transmission.

Taking the example that the terminal device sends side line data to the opposite end in a unicast mode, after the receiving end receives the side line data sent by the sending end through the PSSCH, the receiving end can send SFCI to the sending end in the available PSFCH feedback resources, at this time, the available PSFCH feedback resources are all used for receiving end feedback SFCI, if the available PSFCH feedback resources are greater than resources required for sending SFCI once, the receiving end can repeatedly send SFCI to the sending end in the available PSFCH feedback resources, so as to improve the transmission reliability of SFCI. For example, as shown in fig. 2, the available PSFCH feedback resources corresponding to the PSSCH are 2 subchannels, each subchannel includes 4 physical resource blocks (physical resource block, PRBs), and if the receiving end needs 1 PRB for feeding back SFCI to the transmitting end once, the transmitting end may send SFCI to the receiving end after 8 repetitions on the available PSFCH feedback resources. Or if SFCI feedback requires 1 sub-channel, the sender may send SFCI to the sender after 2 repetitions on the available PSFCH feedback resources.

From the above, during unicast communication, the receiving end may send SFCI once or repeat SFCI multiple times on the determined PFSCH feedback resource, and the transmitting end may receive and parse SFCI sent by the transmitting end on the available PSFCH feedback resource. However, when the terminal apparatus transmits the side line data to the plurality of receiving ends by multicast, the plurality of receiving ends share the available PSFCH feedback resources to feed back SFCI to the receiving ends, and at this time, each receiving end needs to further determine the available PSFCH feedback resources for itself to transmit SFCI frequency domain resources.

In order to solve the problem that under multicast communication, a receiving end adopts available frequency domain resources of PSFCH feedback resources to send SFCI to a sending end, the embodiment of the application provides a SFCI sending method, in the method, after the receiving end determines available PSFCH feedback resources according to transmission resources of side line data, the receiving end determines SFCI frequency domain resources occupied in available PSFCH feedback resources according to indexes of the receiving end in a multicast group, the size X of resource units required for sending SFCI once, the number of multiplexing orthogonal code sequences in X resource units and the like, and sends SFCI to the sending end on the determined frequency domain resources, so that the receiving end and other multiple receiving ends can feed back SFCI to the sending end in a code division multiplexing mode. In particular, the implementation may be described with reference to an embodiment corresponding to the method shown in fig. 4.

In particular, each terminal apparatus shown in fig. 1 may adopt the constituent structure shown in fig. 3 or include the components shown in fig. 3. Fig. 3 is a schematic diagram of a composition of a terminal device 300 according to an embodiment of the present application, where the terminal device 300 may be a terminal device or a chip or a system on a chip in the terminal device. As shown in fig. 3, the terminal apparatus 300 includes a processor 301, a transceiver 302, and a communication line 303.

Further, the terminal device 300 may further include a memory 304. The processor 301, the memory 304, and the transceiver 302 may be connected by a communication line 303.

The processor 301 is a central processing unit (central processing unit, CPU), a general purpose processor network processor (network processor, NP), a digital signal processor (DIGITAL SIGNAL processing, DSP), a microprocessor, a microcontroller, a programmable logic device (programmable logic device, PLD), or any combination thereof. The processor 301 may also be any other device having processing functions, such as, without limitation, a circuit, a device, or a software module.

A transceiver 302 for communicating with other devices or other communication networks. The other communication network may be an ethernet, a radio access network (radio access network, RAN), a wireless local area network (wireless local area networks, WLAN), etc. The transceiver 302 may be a module, circuitry, transceiver, or any device capable of enabling communications.

A communication line 303 for transmitting information between the respective components included in the terminal apparatus 300.

Memory 304 for storing instructions. Wherein the instructions may be computer programs.

The memory 304 may be, but not limited to, a read-only memory (ROM) or other type of static storage device capable of storing static information and/or instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device capable of storing information and/or instructions, an EEPROM, a CD-ROM (compact disc read-only memory) or other optical disk storage, an optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), a magnetic disk storage medium or other magnetic storage device, etc.

It should be noted that the memory 304 may exist separately from the processor 301 or may be integrated with the processor 301. Memory 304 may be used to store instructions or program code or some data, etc. The memory 304 may be located inside the terminal apparatus 300 or outside the terminal apparatus 300, and is not limited.

The processor 301 is configured to execute the instructions stored in the memory 304 to implement the transmission method SFCI according to the following embodiment of the present application.

In one example, processor 301 may include one or more CPUs, such as CPU0 and CPU1 in fig. 3.

As an alternative implementation, the terminal device 300 includes a plurality of processors, for example, the processor 307 may be included in addition to the processor 301 in fig. 3.

As an alternative implementation, the terminal apparatus 300 further comprises an output device 305 and an input device 306. Illustratively, the input device 306 is a keyboard, mouse, microphone, or joystick, and the output device 305 is a display screen, speaker (speaker), or the like.

It should be noted that the terminal apparatus 300 may be a desktop computer, a portable computer, a web server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system, or a device having a similar structure as in fig. 3. Further, the constituent structure shown in fig. 3 does not constitute a limitation of the terminal apparatus, and the terminal apparatus may include more or less components than those shown in fig. 3, or may combine some components, or may be arranged in different components, in addition to those shown in fig. 3.

In the embodiment of the application, the chip system can be composed of chips, and can also comprise chips and other discrete devices.

Further, actions, terms, and the like, which are referred to between embodiments of the present application, are not limited thereto. The message names of interactions between the devices or parameter names in the messages in the embodiments of the present application are just an example, and other names may be used in specific implementations without limitation.

The following describes a transmission method SFCI according to an embodiment of the present application, taking the architecture shown in fig. 1 as an example. The terminal device according to the embodiment described below may include the components shown in fig. 3.

Fig. 4 is a transmission method SFCI according to an embodiment of the present application, as shown in fig. 4, where the method may include:

Step 401: the second terminal device transmits sidestream data to the first terminal device.

The second terminal apparatus may be referred to as a transmitting terminal or a transmitting UE, and the first terminal apparatus may be referred to as a receiving terminal or a receiving UE. The first terminal device, the second terminal device and other terminal devices (such as a third terminal device and the like) are located in the same multicast group, the first terminal device can be any receiving member in the multicast group (such as any terminal device for receiving side line data sent by the second terminal device), the multicast group can be a motorcade, and besides the first terminal device, the second terminal device and the third terminal device, the multicast group can also comprise one or more other terminal devices, and the other terminal devices can be one or more other terminal devices.

Taking fig. 1 as an example, the second terminal device may be the terminal device 1 in fig. 1, the first terminal device may be the terminal device 3 in fig. 1, the third terminal device may be the terminal device 4 in fig. 1, and the terminal devices 1,3, and 4 are located in the same multicast group, which further includes the terminal device 5 in fig. 1, and so on.

The second terminal device may send the side line data to the first terminal device, the third terminal device, and other receiving members in the multicast group by using a multicast method. For example, the second terminal device may send the sidestream data to the first terminal device, the third terminal device, and other receiving members in the multicast group over a physical sidestream shared channel (PHYSICAL SIDELINK SHARED CHANNEL, PSSCH) on a transmission resource of the sidestream data. Alternatively, it may be described that the second terminal apparatus carries the sideline data on the PSSCH, and transmits the PSSCH to the first terminal apparatus, the third terminal apparatus, and other receiving members in the multicast group on the transmission resource of the sideline data by using the multicast scheme.

The transmission resource of the sidestream data may include M first resource units, where M is a positive integer. In the embodiment of the present application, the first resource unit may refer to a sub-channel (sub-channel) or a physical resource block (physical resource block, PRB) or other resources with a granularity of division, which is not limited. Further optionally, the transmission resources of the sideline data further include a time domain resource, where the length of the time domain resource is not limited, and the time domain resource may be one or more slots (slots), one or more minislots (mini slots), or a plurality of continuous symbols (symbols) in one slot or a plurality of continuous symbols in a plurality of slots, and the like, without limitation. For example, sidelink data occupies 1 sub-channel in the frequency domain, and occupies the 0 th symbol to the 12 th symbol in slot1 in the time domain.

Wherein one sub-channel may include a plurality of PRBs. For example, one sub-channel may include 4 PRBs.

For example, the transmission resource of the sidestream data may be configured or scheduled by the network device to the second terminal device, or may be selected autonomously by the second terminal device, without limitation. In addition, transmission resources of the sidelink data may be notified to receiving members in the multicast group by sidelink control information (sidelink control information, SCI) carried on the PSCCH, such as: the first terminal device and the third terminal device are used for enabling the receiving members in the multicast group to receive the side line data on the transmission resources of the side line data, and improving the accuracy of the side line data receiving.

Step 402: the first terminal device receives sidestream data from the second terminal device.

For example, the first terminal apparatus may receive the sideline data through the PSSCH on a transmission resource of the sideline data, or may be described as the first terminal apparatus receiving the PSSCH carrying the sideline data on the transmission resource of the sideline data.

Step 403: the first terminal device determines PSFCH available feedback resources according to the transmission resources of the sidestream data.

The PSFCH feedback resources available may also be described as PSFHC feedback resources that may be used to transmit SFCI, among other things. The PSFCH feedback resources may be periodically configured, and illustratively, the configuration period of the PSFCH feedback resources may be set to N slots, where N is an integer greater than or equal to 1, i.e., one PSFCH feedback resource is configured every N slots.

Wherein PSFCH feedback resources may be used for transmitting sidestream feedback control information (sidelink feedback control information, SFCI). PSFCH the feedback resource may include P second resource units. The second resource unit may refer to a subchannel or a physical resource block or other granularity of division of resources, without limitation. For example, the granularity of the second resource unit may be less than or equal to the granularity of the first resource unit. For example, the first resource unit is a subchannel and the second resource unit is a PRB; or the first resource unit and the second resource unit are all sub-channels; or the first resource unit and the second resource unit are PRBs, etc., without limitation.

The symbol length PSFCH may be divided into PSFCH in long format (long format) and PSFCH in short format (short format) according to the symbol length PSFCH. Long format PSFCH may occupy all available symbols in one slot, such as: occupy all symbols in one slot or 13 symbols in one slot, etc. PSFCH of the short format may occupy 1-2 symbols in one slot. Such as: the last 1-2 available symbols in a slot, etc. may be occupied.

Wherein, the frequency domain position of PSFCH feedback resource has corresponding relation with the frequency domain position of transmission resource of sidestream data. The frequency domain starting position of PSFCH feedback resources may be the same as or different from the frequency domain starting position of transmission resources of sidestream data. The time domain position of the available PSFCH feedback resources may be the same as or different from the time domain position of the transmission resources of the sidelink data. In particular, several possible designs of PSFCH feedback resources are described below in the first scenario of the method shown in FIG. 4.

Step 404: the first terminal apparatus determines the frequency domain resource for transmitting SFCI based on the PSFCH feedback resources available, the index U _index of the first terminal apparatus, and the number of the orthogonal code sequences that can be multiplexed in the X second resource units.

Wherein X is the number of second resource units required by the first terminal device to transmit SFCI to the second terminal device once, and X may be an integer greater than or equal to 1. By way of example, one sub-channel or one PRB may be required for transmission SFCI at a time without limitation.

Wherein SFCI is feedback information corresponding to sidestream data received by the first terminal device from the second terminal device. SFCI may be configured to at least indicate whether the first terminal device correctly receives the sidestream data sent by the second terminal device, SFCI may include at least an Acknowledgement (ACK)/negative acknowledgement (negative acknowledgement, NACK), where ACK is configured to indicate that the sidestream data decoding is successful, and NACK is configured to indicate that the sidestream data decoding is failed; or SFCI may be used to indicate that the first terminal device correctly receives the sidestream data sent by the second terminal device, SFCI may include at least an ACK; or SFCI may be used to indicate that the first terminal device did not properly receive sidestream data sent by the second terminal device, SFCI may include at least a NACK. In addition, SFCI may include other auxiliary information such as: SFCI may also include CSI, RMAI, etc., without limitation.

The frequency domain resources used for transmission SFCI may include a frequency domain starting position of the frequency domain resources used for transmission SFCI within the available PSFCH feedback resources, as well as a frequency domain bandwidth. In the embodiment of the present application, the first terminal device may send SFCI one or more times on the consecutive frequency domain resource units of the PSFCH feedback resources available, where the frequency domain bandwidth of the frequency domain resource used for sending SFCI is equal to the product of the frequency domain bandwidth required for sending SFCI once and the number of times SFCI that the first terminal device sends SFCI on the PSFCH feedback resources available, where the frequency domain bandwidth required for sending SFCI once is X second resource units.

Taking the example that the first terminal device transmits one SFCI to the second terminal device, the first terminal device determining, according to the available PSFCH feedback resources, the index U _index of the first terminal device, the number of multiplexing orthogonal code sequences in the X second resource units, the frequency domain resources for transmitting SFCI in the available PSFCH feedback resources may include:

The first terminal device determines the number K of terminal devices capable of transmitting SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of the orthogonal code sequences required for transmitting SFCI;

the first terminal device determines the frequency domain starting position of the frequency domain resource for transmitting SFCI according to the index U _index of the first terminal device and the number K of the terminal devices capable of transmitting SFCI in X second resource units, and the frequency domain starting position of the frequency domain resource for transmitting SFCI is the first available PSFCH feedback resource A second resource unit for transmitting a frequency domain start position of SFCI frequency domain resources spaced from a frequency domain start position of an available PSFCH feedback resourceA second resource unit, i.e. a frequency domain initial position offset of the PSFCH feedback resources availableThe first second resource unit after the second resource units is used as the frequency domain starting position of the frequency domain resource for transmitting SFCI, and the frequency domain bandwidth of the frequency domain resource for transmitting SFCI is X second resource units.

It should be noted that, in the embodiment of the present application, the P second resource units included in the available PSFCH feedback resources may be ordered from the frequency domain starting position of the PSFCH feedback resource: first second resource unit, second resource unit, and so on, until the P-th second resource unit.

The number of the orthogonal code sequences which can be multiplexed in the X second resource units can also be described as the number of the orthogonal code sequences which can be transmitted in the X second resource units at most. One orthogonal code sequence is X second resource units in length. Specifically, the orthogonal code sequence with the design length of X second resource units is not limited.

The X second resource units in the embodiment of the present application are resource units for transmitting SFCI corresponding to sidestream data multicast by the second terminal device to the first terminal device. The number of the multiplexing-capable orthogonal code sequences in the X second resource units may specifically refer to the number of the multiplexing-capable orthogonal code sequences in the X second resource units for feeding back SFCI corresponding to the side row data described in step 401.

Note that, in the case where the configuration period of the PSFCH feedback resources is N time slots, if the side line data is transmitted in all of the N time slots, and SFCI corresponding to the side line data in the N time slots needs to share the same X second resource units, that is, SFCI corresponding to the side line data in other N-1 time slots is also required to be transmitted in addition to SFCI corresponding to the side line data in step 401 in the X second resource units, the number of the orthogonal code sequences that can be multiplexed in the X second resource units for feeding back SFCI corresponding to the side line data in step 401 isIf the N/N division is not complete, discarding the last orthogonal code sequence in the L orthogonal code sequences to ensure the N/N division; likewise, if the number of orthogonal code sequences required for transmission SFCI is even and L is odd, the last code sequence of the L orthogonal code sequences is discarded, i.e., l=l-1.

Wherein n is the number of multiplexing orthogonal code sequences in the preconfigured X second resource units. Illustratively, the number n of the orthogonal code sequences that can be multiplexed within the X second resource elements can be preconfigured according to the format of PSFCH. For example, in the short format PSFCH, 12 orthogonal code sequences can be multiplexed on one PRB or 12 Resource Elements (REs); 54 orthogonal code sequences can be multiplexed on 10 PRBs or 120 REs; in long format PSFCH, 72 orthogonal code sequences can be multiplexed on 1 PRB or 12 REs.

For example, assuming that the configuration period of the multiplexing-capable orthogonal code sequences on 1 sub-channel is 12, the configuration period of PSFCH feedback resources is 2 time slots, the side line data on the time slot 1 and the time slot 2 are sent, the side line data on each time slot is sent to different multicast groups, and the available PSFCH feedback resources determined according to the transmission resources of the side line data on the time slot 1 are the same as the available PSFCH feedback resources determined according to the transmission resources of the side line data on the time slot 2. If SFCI corresponding to the side line data on the feedback slot 1 needs one subchannel and SFCI corresponding to the side line data on the feedback slot 2 needs one subchannel, then SFCI corresponding to the side line data on the slot 1 can use 6 orthogonal code sequences in the 12 orthogonal code sequences, and SFCI corresponding to the side line data on the slot 2 can use other 6 orthogonal code sequences in the 12 orthogonal code sequences.

The number of orthogonal code sequences required for transmission SFCI may be determined according to the information carried by SFCI, and the number of orthogonal code sequences required for transmission SFCI may be one, two or three, and is not limited. Taking SFCI as ACK or NACK as an example, the number of orthogonal code sequences required for transmitting SFCI is 2, where one orthogonal code sequence is used to indicate ACK and the other orthogonal code sequence is used to indicate NACK.

For example, the number of orthogonal code sequences required for transmission SFCI is 2, and the orthogonal code sequences required for transmission SFCI are respectively an orthogonal code sequence with an index mod (2×u _index, L) and two orthogonal code sequences with an index mod (2×u _index +1, L) out of the L orthogonal code sequences.

The number K of terminal devices that can transmit SFCI in X second resource units may also be described as the number K of terminal devices that can be multiplexed maximally in X second resource units, in other words, SFCI that can support K terminal devices at most is multiplexed on X second resource units. Taking the number of multiplexing-possible orthogonal code sequences in the X second resource units as L, the number of orthogonal code sequences required for transmission SFCI as Num as an example, the number of terminal devices capable of transmitting SFCI in the X second resource units as

Wherein,Representing a rounding down. Such as: ifThen

Wherein the index U _index of the first terminal device may be used to uniquely identify the first terminal device in the multicast group. The index U _index of the first terminal device may also be described as the number of the first terminal device. Specifically, the method for determining the index U _index of the first terminal device may be described with reference to the second scenario of the method shown in fig. 4.

For example, as shown in fig. 1, the multicast group includes terminal device 1, terminal device 3, terminal device 4, and terminal device 5, the index of terminal device 1 may be 0, the index of terminal device 3 may be 1, and so on, the index of terminal device 4 is 2, and the index of terminal device 5 is 3.

For another example, it is assumed that the multicast group includes terminal device 1, terminal device 3, terminal device 4, terminal device 5, terminal device 6, and terminal device 7, the index of terminal device 1 is 0, the index of terminal device 3 is 1, and so on, the index of terminal device 4 is 2, the index of terminal device 5 is 3, the index of terminal device 6 is 4, and the index of terminal device is 5.

Step 405: the first terminal device transmits SFCI to the second terminal device based on the frequency domain resources used for transmission SFCI.

The first terminal device may illustratively feed back the first resource with the PSFCH availableThe first X second resource units are sent SFCI to the second terminal device through one PSFCH.

Taking SFCI including ACK or NACK as an example, when the first terminal device successfully decodes the received sidestream data, the first terminal device may take the following as an exampleTransmitting an orthogonal code sequence with an index mod (2×u _index, L) to the second terminal device through one PSFCH on X second resource units with the first second resource units as the first resource units;

when the first terminal device fails to decode the sidestream data, the first terminal device may be configured to The orthogonal code sequence with the index mod (2×u _index +1, l) is transmitted to the second terminal device through one PSFCH on X second resource units with the first second resource units as the first second resource units.

The embodiment of the present application is not limited to the use of the orthogonal code sequence with the index mod (2×u _index, L) when transmitting ACK, the use of the orthogonal code sequence with the index mod (2×u _index +1, L) when transmitting NACK, and the use of the orthogonal code sequence with the index mod (2×u _index +1, L) when transmitting ACK, and the use of the orthogonal code sequence with the index mod (2×u _index, L) when transmitting NACK.

For example, as shown in fig. 5, taking SFCI as ACK/NACK feedback, taking one subchannel for transmission at a time SFCI as an example, assuming that the configuration period of PSFCH feedback resources is n=2 and the number of multiplexing-capable orthogonal code sequences in one subchannel configured in advance is n=12, the number of multiplexing-capable orthogonal code sequences in one subchannel required for transmitting SFCI corresponding to side line data on each slot isThat is, the number of terminal devices that can be multiplexed in one sub-channel is 3, SFCI corresponding to side line data transmitted in the first time slot can use the first 6 orthogonal code sequences, SFCI corresponding to side line data transmitted in the second time slot can use the last 6 orthogonal code sequences, and up to SFCI capable of supporting 3 UEs for side line data transmitted in each time slot can be multiplexed on PSFCH frequency domain resources corresponding to one sub-channel.

If 7 UEs exist in a multicast communication, wherein 1 sending UE and 6 receiving UEs are used, the sending UE can multicast side line data to the receiving UEs, and indexes of the 6 receiving UEs are respectively 0,1,2, … and 5, 2 sub-channels are needed to support all 6 receiving UEs to perform ACK/NACK feedback. If the available PSFCH feedback resources determined from the transmission resources of the sideline data of the transmitted UE multicast include 5 sub-channels, then the method is as followsIt can be determined that: the offset value between the frequency domain starting position of SFCI frequency domain resources for transmitting receiving UE with index 0,1,2 and the frequency domain starting position of PSFCH feedback resources is 0, the frequency domain starting position of SFCI frequency domain resources for transmitting receiving UE with index 0,1,2 is subchannel 1, and the frequency domain bandwidth of SFCI frequency domain resources for transmitting receiving UE with index 0,1,2 is one subchannel; the offset value between the frequency domain starting position of SFCI frequency domain resources for transmitting receiving UE with index 3,4,5 and the frequency domain starting position of PSFCH feedback resources is 1, the frequency domain starting position of SFCI frequency domain resources for transmitting receiving UE with index 3,4,5 is subchannel 2, and the receiving UE with index 3,4,5 occupies one subchannel to transmit SFCI to the receiving UE.

Wherein, according to the formulas mod (2×u _index, L) and mod (2×u _index +1, L), it can be determined that the receiving UE with index 0 can represent ACK and NACK using orthogonal code sequences with indexes 0 and 1, the receiving UE with index 1 can represent ACK and NACK using orthogonal code sequences with indexes 2 and 3, and the receiving UE with index 2 can represent ACK and NACK using orthogonal code sequences with indexes 4 and 5. The receiving UE with index 3 may represent ACK and NACK using orthogonal code sequences with indexes 0 and 1, the receiving UE with index 4 may represent ACK and NACK using orthogonal code sequences with indexes 2 and 3, and the receiving UE with index 5 may represent ACK and NACK using orthogonal code sequences with indexes 4 and 5.

It should be noted that, the starting index of the terminal device is not limited to the present application, and the embodiment of the present application is described only with the starting index of the terminal device being 0, alternatively, the starting index of the terminal device may be 1 or another value, and the starting index of the orthogonal code sequence may be 1 or another value, which is not limited. When the start index of the terminal device is another integer greater than 0, the above scheme may still be used to determine the frequency domain start position of the SFCI frequency domain resource transmitted by the first terminal device to the second terminal device, and the orthogonal code sequence used for transmitting SFCI.

Step 406: the second terminal device receives SFCI from the first terminal device on the frequency domain resources used for transmission SFCI.

Wherein, the second terminal device may refer to step 403 to determine available PSFCH feedback resources, and then determine, according to the procedure described in step 404, a frequency domain starting position and a frequency domain bandwidth X of the frequency domain resources for transmitting SFCI on the available PSFCH feedback resources, and an orthogonal code sequence used by the first terminal device to transmit SFCI; an orthogonal code sequence from the first terminal apparatus is received through one PSFCH on X second resource units starting from a frequency domain start position of a frequency domain resource for transmission SFCI, and the orthogonal code sequence is received to instruct the first terminal apparatus to feed back to the second terminal apparatus SFCI.

In addition, in steps 402 to 406 shown in fig. 4, the transmission method of SFCI provided in the embodiment of the present application is described by taking feedback SFCI from the first terminal device to the second terminal device in the multicast group as an example. It is understood that other receiving members in the multicast group, such as: the third terminal device, the fourth terminal device, etc. may also send SFCI to the second terminal device with reference to the steps shown in fig. 4, and the corresponding second terminal device may also receive SFCI fed back by other members in the multicast group in the manner described in step 406, which is not described in detail.

In addition, the method shown in fig. 4 uses a code division multiplexing (code division multiplexing, CDM) method for a plurality of terminal apparatuses to multiplex a plurality of orthogonal code sequences for indicating SFCI together and feed back the multiplexed orthogonal code sequences to a transmitting terminal, and describes a SFCI transmitting method provided in an embodiment of the present application. Referring to the principle of transmission SFCI shown in fig. 4, alternatively, a plurality of receiving terminals in the multicast group may also use other multiplexing methods to feed back SFCI to the transmitting terminal, for example: the feedback SFCI to the transmitting terminal may be performed by using a mode of frequency division multiplexing or time-frequency multiplexing or frequency division+code division multiplexing or time-frequency multiplexing+code division multiplexing, without limitation.

Further, in order to improve the utilization ratio of PSFCH feedback resources, if after all receiving members in the multicast group feedback SFCI to the sending terminal by adopting the method shown in fig. 4, the PSFCH feedback resources still have remaining resources, the receiving members in the multicast group may further send other auxiliary information of themselves, such as: and the CSI and/or RMAI are fed back to the sending terminal in a code division multiplexing mode on the residual resources, so that the utilization rate of PSFCH feedback resources is improved. For example, as shown in fig. 5, CSI for receiving UEs with indices 0,1,2 may be sent on subchannel 3 of PSFCH feedback resources, CSI for receiving UEs with indices 3,4,5 may be sent on subchannel 4 of PSFCH feedback resources, and RMAI for all receiving UEs may be sent on subchannel 5 of PSFCH feedback resources.

Based on the method shown in fig. 4, after the receiving terminal in the multicast group determines the available PSFCH feedback resources according to the received transmission resources of the sidestream data, the receiving terminal determines the starting position and the bandwidth of the frequency domain of the available PSFCH feedback resources of SFCI sent by the receiving terminal to the sending terminal and the orthogonal code sequence used for sending SFCI through the index of the terminal device, the size of the resource unit needed by sending SFCI once, the available orthogonal code sequence and other information, so as to realize SFCI feedback, especially ACK/NACK feedback, of the PSSCH transmission by a plurality of receiving terminals in the multicast communication, and solve the problem that the frequency domain resources cannot be determined for SFCI fed back by each receiving terminal in the multicast communication scene.

In the first scenario of the method shown in fig. 4, the following design formats of PSFCH feedback resources are possible:

The first format PSFCH is PSFCH in short format, the frequency domain starting position of the PSFCH feedback resource for transmitting SFCI is the same as the frequency domain starting position of the transmission resource of the sideline data, and the frequency domain bandwidth of the PSFCH feedback resource for transmitting SFCI is smaller than the frequency domain bandwidth of the transmission resource of the sideline data.

For example, if the configuration period N of the PSFCH feedback resources, the frequency domain bandwidth of the PSFCH feedback resources is one-nth of the subchannel bandwidth. Such as: if the frequency domain bandwidth of the sub-channel is 4 PRBs and N is 2, the frequency domain bandwidth of PSFCH feedback resources is 4/2=2 PRBs. And PSFCH, determining the frequency domain starting position of the feedback resource according to the frequency domain starting position of the PSSCH carrying the sidestream data and the time slot position of the PSSCH carrying the sidestream data.

As shown in fig. 6a, SFCI corresponding to PSSCH transmitted in slot 1 and slot 2 is fed back on PSFCH feedback resource of slot 3, slot 1 corresponding to the first slot of n=2 slots, and slot 2 corresponding to the 2 nd slot of n=2 slots. As shown in fig. 6a, if the frequency domain start position of the PSSCH transmitted in the slot 1 is the sub-channel 2, the frequency domain start position of the corresponding PSFCH feedback resource is the sub-channel 2, and since transmitted in the slot 1, SFCI corresponding to the PSSCH can use the first 2 PRBs in the PSFCH feedback resource. The frequency domain starting position of the PSSCH transmitted in the slot 2 is the sub-channel 2, and the frequency domain starting position of the corresponding PSFCH feedback resource is also the sub-channel 2, and since the PSSCH is transmitted in the slot 2, SFCI corresponding to the PSSCH can use the last 2 PRBs in the frequency domain resource of PSFCH. In fig. 6a, the resource units in the PSFCH feedback resource used in SFCI are arranged in the time slot sequence, or the resource units in the PSFCH feedback resource used in SFCI may be arranged in frequency priority, which is not limited in the embodiment of the present application.

And the format two and PSFCH are PSFCH with short format, the frequency domain initial position of PSFCH feedback resource is the same as the frequency domain initial position of transmission resource of sidestream data, and the frequency domain bandwidth of PSFCH feedback resource is equal to the frequency domain bandwidth of transmission resource of sidestream data.

As shown in fig. 6b, the PSSCH carrying sideline data occupies the frequency domain bandwidth of 2 subchannels, and the frequency domain bandwidth of the PSFCH feedback resources available is also 2 subchannels. If the transmission of SFCI corresponding to the PSSCH of N slots is supported on the same PSFCH feedback resources, SFCI corresponding to the PSSCH of N slots can be transmitted by using a code division multiplexing method. As shown in fig. 6b, n=2, the PSSCH on slot 1 corresponds to a set of orthogonal code sequences that can be used to indicate SFCI corresponding to the PSSCH on slot 1; the PSSCH on slot 2 can correspond to another set of orthogonal code sequences that can be used to indicate SFCI to which the PSSCH on slot 2 corresponds. Two sets of orthogonal code sequences may be multiplexed for transmission on PSFCH feedback resources of slot 3.

And formats III and PSFCH are PSFCH with long format, the frequency domain starting position of PSFCH feedback resource is different from the frequency domain starting position of transmission resource of side line data, the frequency domain starting position of PSFCH feedback resource has a corresponding relation with the frequency domain starting position of transmission resource of side line data, the frequency domain bandwidth of PSFCH feedback resource is smaller than that of transmission resource of side line data, and the number of second resource units included in PSFCH feedback resource is equal to X times of the number of first resource units included in transmission resource of side line data.

Taking the frequency domain bandwidth of the PSSCH carrying the sideline data as1 sub-channel, the minimum frequency domain bandwidth of PSFCH as 2 PRBs as an example, the frequency domain starting position of PSFCH is 2 times of the number of the frequency domain starting positions of the PSSCH, and the frequency domain bandwidth of PSFCH is 2 times of the number of the sub-channels occupied by the PSSCH, for example: the frequency domain starting position of the PSSCH of one UE is sub-channel 1, and occupies 2 sub-channels, if the frequency domain starting position PRB 2 of PSFCH corresponding to the PSSCH is located, the frequency domain bandwidth of the PSFCH is 4 PRBs.

For example, as shown in fig. 6c, a sideline resource pool is configured to have 20MHz, the subcarrier spacing is 15K, and there are 100 available PRBs, if one subchannel is configured to include 10 PRBs and PSFCH PRBs are included in the sideline resource pool of 20MHz, the sideline resource pool includes 8 subchannels for PSSCH transmission, and 16 PRBs are used for PSFCH transmission, and correspond to the PSSCH. As shown in fig. 6c, the starting PRB of the sidelink resource pool is 1, the length is 100, the starting PRB for PSSCH transmission is 1, the length is 80, the subchannel size is 10, PRBs 1 to 10 correspond to subchannel 1, PRBs 11 to 20 correspond to subchannel 2, and so on to subchannel 8. Starting PRB for PSFCH transmission is 85, length is 16, and the starting PRB corresponds to sub-channels 1-8 respectively. As shown in fig. 6c, the PSFCH offset corresponding to the PSSCH of the sub-channel 1 is 0 with respect to the starting PRB85 used for PSFCH transmission, i.e., the PRB with the index of 85 is located at the beginning of the frequency domain of PSFCH corresponding to the PSSCH of the sub-channel 1; the PSFCH offset corresponding to the PSSCH of subchannel 2 is 2, i.e., the frequency domain starting position of PSFCH corresponding to the PSSCH of subchannel 1 is a PRB with index 87, and so on, the offset 14 corresponding to the PSSCH of subchannel 8 is PSFCH, i.e., the frequency domain starting position of PSFCH corresponding to the PSSCH of subchannel 8 is a PRB with index 99. In fig. 6c, if the PSSCH of UE2 occupies 2 subchannels and the subchannel start position is 2, i.e., UE2 occupies subchannels 2 to 3, the start frequency domain position of PSFCH corresponding to the PSSCH on subchannels 2 to 3 is shifted by 2 PRBs with respect to starting PRB85 for PSFCH transmission, i.e., PSFCH of UE2 occupies 4 PRBs with indexes 87 to 90.

In the second scenario of the method shown in fig. 3, the index U _index of the first terminal device may be determined in any one of three ways:

Mode one, the index U _index of the first terminal apparatus is preconfigured.

For example, when a multicast group is established, each terminal device in the multicast group may be configured with its corresponding index, and further optionally, the configured index may be stored in the terminal device in advance.

In the second embodiment, the index U _index of the first terminal apparatus is notified to the first terminal apparatus by the second terminal apparatus.

In the second aspect, the second terminal apparatus may notify the first terminal of the number of receiving members in the multicast group and notify the first terminal apparatus of other information, without limitation.

Exemplary, implementation of mode two may be as shown in fig. 7 a. Fig. 7a is a schematic diagram of acquiring an index of a terminal device according to an embodiment of the present application, as shown in fig. 7a, the process may include:

the first terminal device sends a request for joining the multicast group to the second terminal device so as to request to join the multicast group where the second terminal device is located; the second terminal device receives a request of joining the multicast group sent by the first terminal device, configures an index for the first terminal device after determining that the first terminal device joins the multicast group, and sends the index of the first terminal device and the number of receiving members successfully joining the multicast group to the first terminal device.

Subsequently, when other new members (e.g., third terminal device) join the multicast group, the second terminal device configures an index for the third terminal device after determining that the third terminal device joins the multicast group, and updates the number of receiving members joining the multicast group, e.g.: and adding 1 to the number of the receiving members joining the multicast group, and transmitting the index of the third terminal device and the updated number of the receiving members of the multicast group to the third terminal device. Further optionally, after the new member joins, the second terminal device further sends the updated number of receiving members of the multicast group to the first terminal device.

In the embodiment of the present application, at least one transmitting terminal in the multicast group, and the second terminal device according to the embodiment of the present application, other members in the multicast group except the transmitting terminal may be referred to as receiving UE or receiving member.

In the second mode, the second terminal apparatus may send, to each member joining the multicast group, an index of the member and the number of receiving members in the multicast group through radio resource control (PC 5-radio resource control, RRC) signaling of the PC5 interface. In this embodiment of the present application, the second terminal device may be referred to as a group header, where the group header may allocate an index 0 to itself, allocate an index 1 to the first terminal device joining the multicast group, allocate an index 2 to the second terminal device joining the multicast group, and so on. For example, if the number of group members including the head in the multicast group is 5, indexes of the 5 members are 0,1,2,3,4, respectively. Further, if a member leaves in the multicast group, the second terminal apparatus may reassign the index of each receiving member and update the number of receiving members in the multicast group.

Illustratively, as shown in fig. 7a, a first terminal device sends a request to leave a multicast group to a second terminal device to request to leave the multicast group; the second terminal device receives a request for leaving the multicast group sent by the first terminal device, determines that the first terminal device leaves the multicast group, and then releases the index of the first terminal device.

Further optionally, the second terminal device reassigns indexes to the receiving members existing in the multicast group, so that the indexes of the receiving members in the multicast group are continuous numbers, and at the same time, updates the number of the receiving members, for example: the number of receiving members is reduced by 1, and the updated index of the third terminal device and the number of receiving members are transmitted to the third terminal device.

Mode three, the index U _index of the first terminal device is determined based on SFCI transmitted by the receiving member in the multicast group.

Exemplary, implementation three may be described with reference to fig. 7 b. Fig. 7b is a schematic diagram of acquiring an index of a terminal device according to an embodiment of the present application, as shown in fig. 7b, the process may include:

The first terminal device receives a request for sending a multicast group joining request to the second terminal device so as to request to join the multicast group where the second terminal device is located; the second terminal device receives the request of joining the multicast group sent by the first terminal device, and after determining that the first terminal device joins the multicast group, configures an index for the first terminal device, for example: when the first terminal device is the first receiving member joining the multicast group, the index of the first terminal device is configured to be 1, meanwhile, the second terminal device multicasts the sidestream data to the first terminal device, after the first terminal device receives the sidestream data, the first terminal device determines the available PSFCH feedback resources, detects and decodes the SFCI fed back by other receiving members on the PSFCH feedback resources, if SFCI fed back by any receiving member is not detected, the first terminal device determines that the index of the first terminal device is 1, and subsequently, the first terminal device may use the index 1 to perform step 404, determine the frequency domain resources for transmitting SFCI, and transmit SFCI to the second terminal device on the determined frequency domain resources for transmitting SFCI.

Subsequently, when a new member joins the multicast group during multicast communication, the newly joined UE receives and decodes the sideline data multicast by the second terminal device, determines the available PSFCH feedback resources, detects and decodes SFCI fed back by other receiving members on the PSFCH feedback resources, obtains indexes of other transmitting members in the existing multicast group, selects the first available index from the unused indexes, uses the selected index in the next multicast communication, determines the frequency domain resources and the code domain resources (e.g., orthogonal code sequences used for transmitting SFCI) for transmitting SFCI, and feeds back SFCI to the second terminal device according to the determined frequency domain resources and code domain resources for transmitting SFCI, as described in reference to step 403.

Illustratively, when a second end device joins the multicast group, as shown in FIG. 7b, the second end device determines that the index of the newly joined third end device is 2 based on the index of the existing 1 member. The second terminal device transmits the sidestream data to the first terminal device and the third terminal device in the multicast group, and the first terminal device receives the sidestream data and feeds back SFCI to the second terminal device by referring to the method shown in fig. 4. The third terminal device receives the sidestream data multicast by the second terminal device, and determines the available PSFCH feedback resources as described in step 403, detects and decodes SFCI fed back by other receiving members on PSFCH feedback resources, and obtains indexes of other sending members in the existing multicast group, for example: if index 1 is found to be occupied by the first terminal device, the third terminal device selects the index 2, which is the first available index in the unused indexes, as its own index. At the next multicast communication between the third terminal apparatus and the second terminal apparatus, the third terminal apparatus may determine frequency domain resources and code domain resources for transmission SFCI according to index 2 and other information, and feed back SFCI to the second terminal apparatus according to the determined frequency domain resources and code domain resources for transmission SFCI, with reference to step 404.

Further, as shown in fig. 7b, when a third team member (fourth terminal apparatus) joins the multicast group, the team head determines that the index of the newly joined fourth terminal apparatus is 3 based on the indexes of the existing 2 team members. The second terminal device transmits the sidestream data to the first terminal device, the third terminal device, and the fourth terminal device in the multicast group, and the first terminal device and the third terminal device receive the sidestream data and feed back SFCI to the second terminal device by referring to the method shown in fig. 4. The fourth terminal device receives the sidestream data multicast by the second terminal device, and determines the available PSFCH feedback resources according to step 403, detects and decodes SFCI fed back by other receiving members on PSFCH feedback resources, and obtains indexes of other sending members in the existing multicast group, for example: when index 1 and index 2 are found to be occupied by the first terminal device, the fourth terminal device selects the index 3 available as its own index from the first unused indexes. At the next multicast communication between the fourth terminal apparatus and the second terminal apparatus, the fourth terminal apparatus may determine frequency domain resources and code domain resources for transmission SFCI according to index 3 and other information, and feed back SFCI to the second terminal apparatus according to the determined frequency domain resources and code domain resources for transmission SFCI, with reference to step 404.

In the first multicast communication between the newly added member (e.g., the fourth terminal device) and the second terminal device, the group header does not receive the feedback information of the fourth terminal device at this time, and considers that the fourth terminal device fails to receive, and the group header retransmits the side-row data to the fourth terminal device by using the hybrid automatic repeat request (hybrid automatic repeat request, HARQ) technique. Subsequently, the newly added member (e.g., the fourth terminal apparatus) has obtained the index, and the index may be used to determine the frequency domain resource of the transmission SFCI for ACK/NACK feedback.

In the third mode, the first terminal device can obtain its own index by sensing and decoding SFCI fed back by other receiving members in the multicast group, and does not need to obtain its own index through interaction with the second terminal device, so that signaling interaction between devices can be reduced, and resource utilization rate can be improved.

In the method shown in fig. 4, by taking a mode of using code division multiplexing to send SFCI fed back by a plurality of terminal devices to a transmitting terminal as an example, in another possible scheme, SFCI fed back by a plurality of terminal devices may be repeatedly sent to the transmitting terminal by using a mode of code division multiplexing, so as to improve the resource rate of PSFCH feedback resources and the transmission reliability of SFCI. In particular, this possibility is illustrated with reference to fig. 8.

Fig. 8 is a further transmission method SFCI according to an embodiment of the present application, as shown in fig. 8, where the method may include:

Step 801: the second terminal device transmits sidestream data to the first terminal device.

Step 801 may be described with reference to step 401, and will not be described again.

Step 802: the first terminal device receives sidestream data from the second terminal device.

Step 802 may be described with reference to step 402, and is not repeated.

Step 803: the first terminal device determines PSFCH available feedback resources according to the transmission resources of the sidestream data.

The implementation formats of PSFCH feedback resources may be described in the first scenario of the method shown in fig. 4, and the specific implementation process of step 803 may be described in reference to step 403, which is not repeated.

Step 804: the first terminal device determines the frequency domain resource for transmitting SFCI and the number of repeated transmissions of SFCI according to the PSFCH feedback resources available, the number Q of receiving members in the multicast group, the index U _index of the first terminal device, and the number of multiplexing orthogonal code sequences in the X second resource units.

The description of the index U _index of the first terminal device and the description of the number of the orthogonal code sequences that can be multiplexed in the X second resource units can be referred to in step 404. The method for obtaining the index U _index of the first terminal device may be described in the first to third modes, and the method for obtaining the number Q of the receiving members in the multicast group may be described in the third mode, which is not repeated.

Wherein the frequency domain resources for transmission SFCI may include a frequency domain start position and a frequency domain bandwidth of the frequency domain resources for transmission SFCI. In step 804, the frequency domain bandwidth of the frequency domain resource used for transmission SFCI is equal to the product of the number of repeated transmissions of SFCI and the number X of second resource units required for one transmission SFCI.

For example, the determining, by the first terminal device, the frequency domain resource for transmitting SFCI and the number of repeated transmissions of SFCI according to the available PSFCH feedback resources, the number Q of receiving members in the multicast group, the index U _index of the first terminal device, and the number of multiplexing orthogonal code sequences in the X second resource units may include:

The first terminal device determines the number K of terminal devices capable of transmitting SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of orthogonal codes required for transmitting SFCI;

the first terminal device determines the number of second resource units needed by all receiving members to send SFCI to the second terminal device according to the number Q of receiving members in the multicast group and the number K of terminal devices capable of transmitting SFCI in X second resource units Representing a downward rounding;

The first terminal device determines the minimum number of times that all receiving members can repeatedly send SFCI to the second terminal device on the available PSFCH feedback resource according to the number P and S of the second resource units of the available PSFCH feedback resource And the number re=mod (P, S) of redundant second resource units in the available PSFCH feedback resources;

The first terminal device determines, according to the index U _index of the first terminal device and the number K of terminal devices capable of transmitting SFCI in X second resource units, a logical index of a frequency domain start position of the frequency domain resource for transmitting SFCI as follows:

If i < Re, determining that the frequency domain starting position of the frequency domain resource for transmitting SFCI is separated from the frequency domain starting position of the available PSFCH feedback resource by i× (rp+1) X number of second resource units, the frequency domain starting position of the frequency domain resource for transmitting SFCI is the i× (rp+1) X number of second resource units of the available PSFCH feedback resource, that is, the frequency domain starting position of the frequency domain resource for transmitting SFCI is the first second resource unit after the frequency domain starting position of the available PSFCH feedback resource is offset i× (rp+1) X number of second resource units, and the number of repeated transmissions of SFCI is rp+1;

If i > =re, the frequency domain start position of the frequency domain resource for transmitting SFCI is determined to be separated from the frequency domain start position of the available PSFCH feedback resource by (re× (rp+1) + (i-Re) ×rp) ×x second resource units, the frequency domain start position of the frequency domain resource for transmitting SFCI is the (re× (rp+1) + (i-Re) ×rp) ×x second resource units of the available PSFCH feedback resource, that is, the frequency domain start position of the frequency domain resource for transmitting SFCI is the first second resource unit after the frequency domain start position of the available PSFCH feedback resource is shifted by (re× (rp+1) + (i-Re) ×rp) ×x, and the number of repeated transmissions of SFCI is Rp.

Step 805: the first terminal apparatus repeatedly transmits SFCI to the second terminal apparatus according to the frequency domain resource for transmission SFCI and the number of repeated transmissions of SFCI.

For example, taking the number of repeated transmissions of SFCI as C as an example, the first terminal device may repeatedly transmit C SFCI to the second terminal device through one PSFCH on x×c second resource elements starting from the frequency domain start position of the frequency domain resource for transmission SFCI, and each SCFI occupies X second resource elements.

Taking SFCI including ACK or NACK as an example, when the first terminal apparatus successfully decodes received sideline data, the first terminal apparatus may repeatedly transmit C orthogonal code sequences with index mod (2×u _index, L) to the second terminal apparatus through one PSFCH on x×c second resource units starting with a frequency domain start position of the frequency domain resource for transmission SFCI;

when the first terminal apparatus fails to decode the sidestream data, the first terminal apparatus may transmit, to the second terminal apparatus, C orthogonal code sequences with indexes mod (2×u _index +1, l) repeatedly over one PSFCH on x×c second resource units starting with the frequency domain start position of the frequency domain resource for transmission SFCI.

The embodiment of the present application is not limited to the use of the orthogonal code sequence with the index mod (2×u _index, L) when transmitting ACK, the use of the orthogonal code sequence with the index mod (2×u _insex +1, L) when transmitting NACK, and the use of the orthogonal code sequence with the index mod (2×u _index +1, L) when transmitting ACK, and the use of the orthogonal code sequence with the index mod (2×u _index, L) when transmitting NACK.

For example, as shown in fig. 9, taking SFCI as ACK/NACK feedback, taking one subchannel for transmission at a time SFCI as an example, assuming that the configuration period of PSFCH feedback resources is n=2 and the number of multiplexing-capable orthogonal code sequences in one subchannel configured in advance is n=12, the number of multiplexing-capable orthogonal code sequences in one subchannel required for transmitting SFCI corresponding to side line data on each slot isThat is, the number of terminal devices that can be multiplexed in one sub-channel is 3, SFCI corresponding to side line data transmitted in the first time slot can use the first 6 orthogonal code sequences, SFCI corresponding to side line data transmitted in the second time slot can use the last 6 orthogonal code sequences, and up to SFCI capable of supporting 3 UEs for side line data transmitted in each time slot can be multiplexed on PSFCH frequency domain resources corresponding to one sub-channel.

If 7 UEs exist in a multicast communication, wherein 1 sending UE and 6 receiving UEs are used, the sending UE can multicast side line data to the receiving UEs, and indexes of the 6 receiving UEs are respectively 0,1,2, … and 5, at least 2 subchannels are needed to support all 6 receiving UEs to perform ACK/NACK feedback. If the available PSFCH feedback resources determined from the transmission resources of the sideline data of the transmitted UE multicast include 5 sub-channels, then the method is as followsIt can be determined that at least the number of times transmission can be repeated is rp=2, while re=1 subchannels remain. According to the formulaIt can be determined that: the logical index i of the frequency domain starting position of the frequency domain resource for SFCI of the receiving UE with the transmission index 0,1,2 is 0, less than re=1, the offset value between the frequency domain starting position of the frequency domain resource of SFCI and the frequency domain starting position of the PSFCH feedback resource of the 3 receiving UEs can be determined to be 0 according to the formula i× (rp+1) ×x, the frequency domain starting position of the frequency domain resource of SFCI of the receiving UE with the transmission index 0,1,2 is sub-channel 1, and the number of times of repeated transmission SFCI of the three receiving UEs with the index 0,1,2 can be determined to be 3 according to the formula rp+1, that is, the three receiving UEs can occupy three sub-channels 1 to 3 sub-channels and repeatedly transmit SFCI times.

Similarly, according to the formulaIt can be determined that: the logical index i of the frequency domain start position of the frequency domain resource for SFCI of the receiving UE having the transmission index 3,4,5 is 1, equal to Re, and according to the formula (re× (rp+1) + (i-Re) ×rp) ×x, an offset value between the frequency domain start position of the frequency domain resource for SFCI of the 3 receiving UEs and the frequency domain start position of the PSFCH feedback resource can be determined to be 3, the frequency domain start position of the frequency domain resource for SFCI of the receiving UE having the transmission index 3,4,5 is subchannel 4, and the number of times of repeated transmission SFCI of the three receiving UEs having the index 3,4,5 is 2, that is, the three receiving UEs can occupy two subchannels 4 to subchannel 5 and repeatedly transmit SFCI times.

Step 806: the second terminal device receives SFCI repeated by the first terminal device on the frequency domain resources used for transmission SFCI.

The second terminal device may determine the available PSFCH feedback resources with reference to step 803, and then determine, according to the process described in step 804, the frequency domain starting position of the frequency domain resource for transmitting SFCI on the available PSFCH feedback resources, the number of repeated transmissions of SFCI, and the orthogonal code sequence used by the first terminal device to transmit SFCI;

Taking the number of repeated transmissions of SFCI as C as an example, the second terminal device may receive, from one PSFCH, C orthogonal code sequences repeatedly transmitted by the first terminal device on x×c second resource units starting from the frequency domain starting position of the frequency domain resource for transmitting SFCI, and analyze the C orthogonal code sequences to obtain SFCI that the first terminal device feeds back to the second terminal device.

In addition, steps 802 to 806 shown in fig. 8 take feedback SFCI from the first terminal device to the second terminal device in the multicast group as an example, and the transmission method of SFCI provided in the embodiment of the present application is described. It is understood that other receiving members in the multicast group, such as: the third terminal device, the fourth terminal device, etc. may also send SFCI to the second terminal device with reference to the steps shown in fig. 8, and the corresponding second terminal device may also receive SFCI fed back by other members in the multicast group in the manner described in step 806, which is not described in detail.

In addition, the method shown in fig. 8 uses a code division multiplexing (code division multiplexing, CDM) method for a plurality of terminal apparatuses to multiplex a plurality of orthogonal code sequences for indicating SFCI together and feed back the multiplexed code sequences to a transmitting terminal, and describes a SFCI transmitting method provided in an embodiment of the present application. Referring to the principle of transmission SFCI shown in fig. 8, alternatively, multiple receiving terminals in the multicast group may also use other multiplexing methods to feed back SFCI to the transmitting terminal, for example: the feedback SFCI to the transmitting terminal may be performed by using a mode of frequency division multiplexing or time-frequency multiplexing or frequency division+code division multiplexing or time-frequency multiplexing+code division multiplexing, without limitation.

Further, in order to improve the utilization ratio of PSFCH feedback resources, if after all receiving members in the multicast group repeatedly send SFCI to the sending terminal by adopting the method shown in fig. 8, the PSFCH feedback resources still have remaining resources, the receiving members in the multicast group may further send other auxiliary information of themselves, such as: and the CSI and/or RMAI are fed back to the sending terminal in a code division multiplexing mode on the residual resources, so that the utilization rate of PSFCH feedback resources is improved.

Based on the method shown in fig. 8, after the receiving terminal in the multicast group determines the available PSFCH feedback resources according to the transmission resources of the received sidestream data, the receiving terminal determines the starting position of the SFCI feedback resources in the available PSFCH, the repeated transmission times of SFCI and the orthogonal code sequences used for transmitting SFCI, which are sent by the receiving terminal to the transmitting terminal, according to the index of the terminal device, the size of the resource unit needed by transmitting SFCI once, the available orthogonal code sequences, the number of receiving members in the multicast group and other information, so as to realize SFCI feedback, especially ACK/NACK feedback, of the PSSCH transmission by a plurality of receiving terminals in multicast communication, and solve the problem that the frequency domain resources cannot be determined for SFCI fed back by each receiving terminal in the multicast communication scene. Meanwhile, the transmission reliability is improved by repeatedly sending SFCI to the sending terminal by utilizing PSFCH feedback resources, and in addition, the power influence can be further reduced by occupying continuous frequency domain resources when the transmission is repeated SFCI, so that the transmission reliability is improved by SFCI.

The scheme provided by the embodiment of the application is mainly introduced from the interaction angle among the network elements. It is to be understood that each network element, e.g. SDN controller, forwarder, in order to implement the above-mentioned functions, comprises corresponding hardware structures and/or software modules performing each function. Those of skill in the art will readily appreciate that the various illustrative algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The embodiment of the application can divide the functional modules of the SDN controller and the repeater according to the method example, for example, each functional module can be divided corresponding to each function, and two or more functions can be integrated in one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation.

In the case where respective functional modules are divided with corresponding respective functions, fig. 10 shows a block diagram of a terminal apparatus 100, the terminal apparatus 100 may be a first terminal apparatus or a chip or a system on chip in the first terminal apparatus, and the terminal apparatus 100 may be used to perform the functions of the first terminal apparatus related to the above-described embodiment. The terminal device 100 shown in fig. 10 includes: a receiving unit 1001, a processing unit 1002, and a transmitting unit 1003.

As an implementation manner, a receiving unit 1001 is configured to receive sidestream data from a second terminal device; the transmission resource of the sidestream data comprises M first resource units, wherein M is a positive integer; for example, the reception unit 1001 may support the terminal apparatus 100 to perform step 402.

A processing unit 1002, configured to determine an available PSFCH feedback resource according to a transmission resource of the sidestream data; the PSFCH feedback resources available include P second resource units; determining a frequency domain resource for transmitting SFCI according to the available PSFCH feedback resources, the index U _index of the first terminal device and the number of the multiplexing orthogonal code sequences in the X second resource units; x is the number of second resource units required for transmission SFCI, and X is an integer greater than or equal to 1; SFCI is used to at least indicate whether the first terminal device is correctly receiving sidestream data. For example, the processing unit 1002 may support the terminal apparatus 100 to perform steps 403, 404.

A transmitting unit 1003 is configured to transmit SFCI to the second terminal device according to the frequency domain resource used for transmission SFCI. For example, the transmission unit 1003 may support the terminal apparatus 100 to perform step 405.

In this implementation manner, the processing unit 1002 is specifically configured to: determining the number K of terminal devices capable of transmitting SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of the orthogonal code sequences required for transmitting SFCI; determining a frequency domain starting position of a frequency domain resource for transmitting SFCI as a PSFCH feedback resource available based on an index U _index of the first terminal device and the number K of terminal devices capable of transmitting SFCI in X second resource unitsAnd a second resource unit.

The transmitting unit 1003 is specifically configured to: at the firstThe first X second resource units are sent SFCI to the second terminal device through one PSFCH.

As yet another implementation manner, a receiving unit 1001 is configured to receive sidestream data from the second terminal device; the transmission resource of the sidestream data comprises M first resource units, wherein M is a positive integer; for example, the reception unit 1001 may support the terminal apparatus 100 to perform step 802.

A processing unit 1002, configured to determine an available PSFCH feedback resource according to a transmission resource of the sidestream data; the PSFCH feedback resources available include P second resource units; determining frequency domain resources for transmitting SFCI and the repeated transmission times of SFCI according to the available PSFCH feedback resources, the number Q of receiving members in the multicast group, the index U _index of the first terminal device and the number of multiplexing orthogonal code sequences in X second resource units; x is the number of second resource units required for transmission SFCI, and X is an integer greater than or equal to 1; SFCI is used to at least indicate whether the first terminal device is correctly receiving sidestream data. For example, the processing unit 1002 may support the terminal apparatus 100 to perform step 803, step 804.

A transmitting unit 1003 configured to repeatedly transmit SFCI to the second terminal apparatus according to the frequency domain resource used for transmission SFCI and the number of repeated transmissions of SFCI. For example, the transmission unit 1003 may support the terminal apparatus 100 to execute step 805.

In this further possible design, the processing unit 1002 is specifically configured to: determining the number K of terminal devices capable of transmitting SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of the orthogonal codes required for transmitting SFCI; determining the number of second resource units needed by all receiving members to send SFCI to the second terminal device according to the number Q of receiving members in the multicast group and the number K of terminal devices capable of transmitting SFCI in X second resource unitsDetermining the minimum number of times/>, on the available PSFCH feedback resources, that all receiving members can repeatedly send SFCI to the second terminal device according to the number P and S of second resource units of the available PSFCH feedback resourcesAnd the number re=mod (P, S) of redundant second resource units in the available PSFCH feedback resources; based on the index U _index of the first terminal device and the number K of terminal devices that can transmit SFCI in X second resource units, the logical index for determining the frequency domain starting position of the frequency domain resource for transmitting SFCI is: /(I)If i < Re, determining that the frequency domain starting position of the frequency domain resource for transmitting SFCI is the ith× (rp+1) ×x second resource units of the available PSFCH feedback resource, and the number of repeated transmissions of SFCI is rp+1; if i > =re, the frequency domain start position of the frequency domain resource for transmission SFCI is determined to be the (re× (rp+1) + (i-Re) ×rp) ×x second resource units of the available PSFCH feedback resource, and the number of repeated transmissions of SFCI is Rp.

The transmitting unit 1003 is specifically configured to: if i < Re, (rp+1) times SFCI are transmitted to the second terminal apparatus through one PSFCH on (rp+1) X second resource units starting from the (rp+1) X second resource units; if i > =re, rp is transmitted SFCI times to the second terminal apparatus via one PSFCH on rp×x second resource units starting from (re× (rp+1) + (i-Re) ×rp) ×x second resource units.

In the two possible implementations, the processing unit 1002 is further configured to determine, according to the index U _index of the first terminal device and the number L of the orthogonal code sequences that can be multiplexed in the X second resource units, that the orthogonal code sequence required for transmitting SFCI is an orthogonal code sequence with an index mod (2×u _index, L) and an orthogonal code sequence with an index mod (2×u _index +1, L).

In the two possible implementations, the index U _index of the first terminal device is preconfigured; or the index U _index of the first terminal device is notified to the first terminal device by the second terminal device; or the index U _index of the first terminal device is determined according to SFCI of the receiving member of the multicast group.

Wherein the number of receiving members in the multicast group is notified to the first terminal device by the second terminal device.

As yet another implementation, the processing unit 1002 in fig. 10 may be replaced by a processor, which may integrate the functions of the processing unit 1002. The transmitting unit 1003 and the receiving unit 1001 in fig. 10 may be replaced by a transceiver, and the transceiver may integrate functions of the transmitting unit 1003 and the receiving unit 1001. Further, the terminal device 100 shown in fig. 10 may further include a memory.

When the processing unit 1002 is replaced with a processor and the transmitting unit 1003 and the receiving unit 1001 are replaced with a transceiver, the terminal apparatus 100 according to the embodiment of the present application may be the terminal apparatus shown in fig. 3.

Fig. 11 shows a block diagram of a terminal device 110, which terminal device 110 may be a second terminal device or a chip or a system on chip in a second terminal device, which terminal device 110 may be used to perform the functions of the second terminal device as referred to in the above embodiments. As one implementation, the terminal device 110 shown in fig. 11 includes: a transmitting unit 1101, a receiving unit 1103;

in one example, a transmitting unit 1101 is configured to transmit sidestream data to a first terminal device; the transmission resource of the sidestream data comprises M first resource units, wherein M is a positive integer. For example, the transmission unit 1101 may support the terminal apparatus 110 to perform step 401.

A processing unit 1102, configured to determine an available PSFCH feedback resource according to a transmission resource of the sidestream data; the PSFCH feedback resources available include P second resource units; determining a frequency domain resource for transmitting SFCI according to the available PSFCH feedback resources, the index U _index of the first terminal device and the number of the multiplexing orthogonal code sequences in the X second resource units; x is the number of second resource units required for transmission SFCI, and X is an integer greater than or equal to 1; SFCI is used to at least indicate whether the first terminal device is correctly receiving sidestream data. For example, the processing unit 1102 may support the terminal device 110 to perform step 406.

A receiving unit 1103 is configured to receive SFCI from the first terminal device on the frequency domain resource used for transmitting SFCI. For example, the receiving unit 1103 may support the terminal apparatus 110 to execute step 406.

The processing unit 1102 is specifically configured to: determining the number K of terminal devices capable of transmitting SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of the orthogonal code sequences required for transmitting SFCI; determining a frequency domain starting position of a frequency domain resource for transmitting SFCI as a PSFCH feedback resource available based on an index U _index of the first terminal device and the number K of terminal devices capable of transmitting SFCI in X second resource unitsAnd a second resource unit.

The receiving unit 1103 is specifically configured to: at the firstThe first X second resource units are each configured to receive SFCI from the first terminal device via one PSFCH. Based on this possible design, the receiving unit 1103 may receive the primary SFCI sent by the first terminal device on PSFCH feedback resources.

In yet another example, the transmitting unit 1101 is configured to transmit sidestream data to the first terminal device; the transmission resource of the sidestream data comprises M first resource units, wherein M is a positive integer. For example, the transmission unit 1101 may support the terminal apparatus 110 to perform step 801.

A processing unit 1102, configured to determine an available PSFCH feedback resource according to a transmission resource of the sidestream data; the PSFCH feedback resources available include P second resource units; determining frequency domain resources for transmitting SFCI and the repeated transmission times of SFCI according to the available PSFCH feedback resources, the number Q of receiving members in the multicast group, the index U _index of the first terminal device and the number of multiplexing orthogonal code sequences in the X second resource units; x is the number of second resource units required for transmission SFCI, and X is an integer greater than or equal to 1; SFCI is used to indicate whether the first terminal device correctly receives sidestream data. For example, the processing unit 1102 may support the terminal device 110 to perform step 806.

A receiving unit 1103 is configured to receive SFCI that is repeatedly sent by the first terminal device on the frequency domain resource used for sending SFCI. For example, the receiving unit 1103 may support the terminal apparatus 110 to execute step 806.

The processing unit 1102 is specifically configured to: determining the number K of terminal devices capable of transmitting SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of the orthogonal codes required for transmitting SFCI; determining the number of second resource units needed by all receiving members to send SFCI to the second terminal device according to the number Q of receiving members in the multicast group and the number K of terminal devices capable of transmitting SFCI in X second resource unitsDetermining the minimum number of times that all receiving members can repeatedly send SFCI to the second terminal device on the available PSFCH feedback resource according to the number P and S of the second resource units of the available PSFCH feedback resourceAnd the number re=mod (P, S) of redundant second resource units in the available PSFCH feedback resources; based on the index U _index of the first terminal device and the number K of terminal devices that can transmit SFCI in X second resource units, the logical index for determining the frequency domain starting position of the frequency domain resource for transmitting SFCI is: /(I)If i < Re, determining that the frequency domain starting position of the frequency domain resource for transmitting SFCI is the ith× (rp+1) ×x second resource units of the available PSFCH feedback resource, and the number of repeated transmissions of SFCI is rp+1; if i > =re, the frequency domain start position of the frequency domain resource for transmission SFCI is determined to be the (re× (rp+1) + (i-Re) ×rp) ×x second resource units of the available PSFCH feedback resource, and the number of repeated transmissions of SFCI is Rp.

The sending unit 1101 is specifically configured to: if i < Re, (rp+1) times SFCI transmitted by the first terminal device is received by one PSFCH on (rp+1) X second resource units starting with the (rp+1) X second resource units; if i > =re, on rp×x second resource units starting from (re× (rp+1) + (i-Re) ×rp) ×x second resource units, rp times SFCI transmitted by the first terminal apparatus is received through one PSFCH. Based on this possible design, the receiving unit 1103 may receive multiple repetitions SFCI of the first terminal device's transmission on PSFCH feedback resources.

In the above two examples, the processing unit 1102 is further configured to determine, according to the index U _index of the first terminal device and the number L of the orthogonal code sequences that can be multiplexed in the X second resource units, that the orthogonal code sequence required for transmitting SFCI is an orthogonal code sequence with an index mod (2×u _index, L) and an orthogonal code sequence with an index mod (2×u _index +1, L).

Wherein the index U _index of the first terminal device is preconfigured; or the index U _index of the first terminal device is notified to the first terminal device by the second terminal device; or the index U _index of the first terminal device is determined according to SFCI of the receiving member of the multicast group.

As yet another implementation, the processing unit 1102 in fig. 11 may be replaced by a processor, which may integrate the functionality of the processing unit 1102. The transmitting unit 1101 and the receiving unit 1103 in fig. 11 may be replaced by a transceiver, and the transceiver may integrate functions of the transmitting unit 1101 and the receiving unit 1103. Further, the terminal device 110 shown in fig. 11 may further include a memory.

When the processing unit 1102 is replaced by a processor and the transmitting unit 1101 and the receiving unit 1103 are replaced by transceivers, the terminal apparatus 110 according to the embodiment of the present application may be the terminal apparatus shown in fig. 3.

Fig. 12 is a block diagram of a transmission system SFCI according to an embodiment of the present application, where, as shown in fig. 12, the system may include: the first terminal apparatus 120, the second terminal apparatus 121 may further include: and a third terminal device 120.

The first terminal device 120 and the third terminal device 120 have the functions of the terminal device 100 shown in fig. 10. The second terminal apparatus 121 has the functions of the terminal apparatus 110 shown in fig. 11.

In an example, the first terminal device 120 is configured to determine the available PSFCH feedback resources according to the sidestream data received from the second terminal device 121, determine the frequency domain resources for transmitting SFCI according to the available PSFCH feedback resources, the index of the first terminal device 120, and the number of the multiplexing-capable orthogonal code sequences, and transmit SFCI to the second terminal device 121 according to the frequency domain resources for transmitting SFCI.

In yet another example, the first terminal apparatus 120 is configured to determine an available PSFCH feedback resource according to the sidestream data received from the second terminal apparatus 121, determine a number of repeated transmissions of the frequency domain resource and SFCI for transmission SFCI according to the available PSFCH feedback resource, the number of receiving members in the multicast group, the index of the first terminal apparatus 120, and the number of multiplexing orthogonal code sequences, and repeatedly transmit SFCI to the second terminal apparatus 121 according to the frequency domain resource and SFCI for transmission SFCI.

In particular, in this possible design, the specific implementation procedure of the first terminal device 120 may refer to the implementation procedure of the first terminal device according to the above-mentioned method embodiments of fig. 4 and 8, and the specific implementation procedure of the second terminal device 121 may refer to the implementation procedure of the second terminal device according to the above-mentioned method embodiments of fig. 4 and 8.

Based on the system shown in fig. 12, after the first terminal device 120 in the multicast group determines the available PSFCH feedback resources according to the transmission resources of the received sideline data, the first terminal device 120 determines the starting position of the SFCI feedback resources in the available PSFCH, the frequency domain bandwidth of SFCI and the orthogonal code sequence used for transmitting SFCI, which are sent by the first terminal device 120 to the second terminal device 121, through the index of the terminal device, the size of the resource unit needed by transmitting SFCI once, the available orthogonal code sequence, the number of receiving members in the multicast group and other information, so as to realize SFCI feedback, especially ACK/NACK feedback, of PSSCH transmission by a plurality of first terminal devices 120 in multicast communication, thereby solving the problem that the frequency domain resources cannot be determined for SFCI fed back by each first terminal device 120 in the multicast communication scenario.

The embodiment of the application also provides a computer readable storage medium. All or part of the flow in the above method embodiments may be implemented by a computer program to instruct related hardware, where the program may be stored in the above computer readable storage medium, and when the program is executed, the program may include the flow in the above method embodiments. The computer readable storage medium may be an internal storage unit of the terminal device (including the data transmitting end and/or the data receiving end) of any of the foregoing embodiments, for example, a hard disk or a memory of the terminal device. The computer-readable storage medium may be an external storage device of the terminal apparatus, for example, a plug-in hard disk, a smart card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, or a flash memory card (FLASH CARD) provided in the terminal apparatus. Further, the computer-readable storage medium may include both the internal storage unit and the external storage device of the terminal apparatus. The computer-readable storage medium is used for storing the computer program and other programs and data required by the terminal device. The above-described computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.

It should be noted that the terms "first" and "second" and the like in the description, the claims and the drawings of the present application are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

It should be understood that, in the present application, "at least one (item)" means one or more, "a plurality" means two or more, "at least two (items)" means two or three and three or more, "and/or" for describing an association relationship of an association object, three kinds of relationships may exist, for example, "a and/or B" may mean: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.

From the foregoing description of the embodiments, it will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of functional modules is illustrated, and in practical application, the above-described functional allocation may be implemented by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to implement all or part of the functions described above.

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another apparatus, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and the parts displayed as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions for causing a device (may be a single-chip microcomputer, a chip or the like) or a processor (processor) to perform all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.

The foregoing is merely illustrative of specific embodiments of the present application, and the scope of the present application is not limited thereto, but any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for transmitting sidestream feedback control information SFCI, the method comprising:

the first terminal device receives sidestream data from the second terminal device; the transmission resource of the sidestream data comprises M first resource units, wherein M is a positive integer;

The first terminal device determines available physical sidestream feedback channel PSFCH feedback resources according to the sidestream data transmission resources; the available PSFCH feedback resources include P second resource units;

The first terminal device determines the number K of terminal devices capable of transmitting SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of the orthogonal code sequences required for transmitting SFCI; the X is the number of second resource units needed for sending SFCI, and the X and the K are integers greater than or equal to 1;

The first terminal device determines a frequency domain resource for transmitting the SFCI according to the available PSFCH feedback resource, the index U _index of the first terminal device and the number K; the SFCI is configured to instruct the K terminal devices to correctly receive the sidestream data, where the K terminal devices include the first terminal device;

The first terminal device transmits the SFCI to the second terminal device according to the frequency domain resource used for transmission SFCI.

2. The method of claim 1, wherein the frequency domain resources for transmitting SFCI comprise a frequency domain starting location for frequency domain resources for transmitting SFCI; the first terminal device determines a frequency domain resource for transmitting the SFCI according to the available PSFCH feedback resource, the index U _index of the first terminal device and the number K, and includes:

The first terminal device determines a frequency domain starting position of the frequency domain resource for transmitting the SFCI as the available PSFCH feedback resource according to the index U _index of the first terminal device and the number K And a second resource unit.

3. The method of claim 2, wherein the first terminal device transmitting the SFCI to the second terminal device according to the frequency domain resources used to transmit the SFCI, comprising:

the first terminal device is at the first And transmitting the SFCI to the second terminal device through one PSFCH on X second resource units with the first second resource unit as the first second resource unit.

4. A method according to any one of claims 1-3, wherein the method further comprises:

the first terminal apparatus determines an orthogonal code sequence having an index mod (2×u _index, L) and an orthogonal code sequence having an index mod (2×u _index +1, L) as the orthogonal code sequence required for transmitting the SFCI based on the index U _index of the first terminal apparatus and the number L of the orthogonal code sequences that can be multiplexed in the X second resource units.

5. The method according to any one of claim 1 to 4, wherein,

The index U _index of the first terminal device is preconfigured; or alternatively

The index U _index of the first terminal device is notified to the first terminal device by the second terminal device; or alternatively

The index U _index of the first terminal device is determined according to SFCI of the receiving member in the multicast group.

6. A method for transmitting sidestream feedback control information SFCI, the method comprising:

The second terminal device sends side line data to the first terminal device; the transmission resource of the sidestream data comprises M first resource units, wherein M is a positive integer;

The second terminal device determines available physical sidestream feedback channel PSFCH feedback resources according to the sidestream data transmission resources; the available PSFCH feedback resources include P second resource units;

The second terminal device determines the number K of terminal devices capable of transmitting the SFCI in the X second resource units according to the number of the multiplexing orthogonal code sequences in the X second resource units and the number of the orthogonal code sequences required for transmitting SFCI; the X is the number of second resource units needed for sending SFCI, and the X and the K are integers greater than or equal to 1;

the second terminal device determines a frequency domain resource for transmitting the SFCI according to the available PSFCH feedback resource, the index U _index of the first terminal device and the number K; the SFCI is configured to instruct the K terminal devices to correctly receive the sidestream data, where the K terminal devices include the first terminal device;

The second terminal device receives the SFCI from the first terminal device on frequency domain resources used to transmit the SFCI.

7. The method of claim 6, wherein the frequency domain resources for transmitting SFCI comprise frequency domain starting locations for transmitting the frequency domain resources of SFCI; the second terminal device determines a frequency domain resource for transmitting the SFCI according to the available PSFCH feedback resource, the index U _index of the first terminal device and the number K, and includes:

The second terminal device determines the frequency domain starting position of the frequency domain resource for transmitting the SFCI as the available PSFCH feedback resource according to the index U _index of the first terminal device and the number K And a second resource unit.

8. The method of claim 7, wherein the second terminal device receives the SFCI from the first terminal device on frequency domain resources used for transmitting the transmission SFCI, comprising:

The second terminal device is at the first terminal device The SFCI is received from the first terminal device over one PSFCH on X second resource units, the first second resource unit being a first number of second resource units.

9. The method according to any one of claims 6-8, further comprising:

The second terminal apparatus determines an orthogonal code sequence having an index mod (2×u _index, L) and an orthogonal code sequence having an index mod (2×u _index +1, L) as the orthogonal code sequence required for transmitting the SFCI based on the index U _index of the first terminal apparatus and the number L of the orthogonal code sequences that can be multiplexed in the X second resource units.

10. The method according to any one of claims 6 to 9, wherein,

The index U _index of the first terminal device is configured by the second terminal device; or alternatively

11. A method for transmitting sidestream feedback control information SFCI, the method comprising:

The first terminal device determines the frequency domain resource for transmitting the SFCI and the repeated transmission times of the SFCI according to the available PSFCH feedback resource, the number Q of receiving members in the multicast group, the index U _index of the first terminal device and the number K; the SFCI is configured to instruct the K terminal devices to correctly receive the sidestream data, where the K terminal devices include the first terminal device;

the first terminal apparatus repeatedly transmits the SFCI to the second terminal apparatus according to the frequency domain resource for transmitting the SFCI and the number of repeated transmissions of the SFCI.

12. The method of claim 11, wherein the frequency domain resources for transmitting SFCI comprise frequency domain starting locations for transmitting the frequency domain resources of SFCI; the first terminal device determines the frequency domain resource for transmitting the SFCI and the repeated transmission times of the SFCI according to the available PSFCH feedback resource, the number Q of receiving members in the multicast group, the index U _index of the first terminal device, and the number K, and includes:

the first terminal device determines the number of second resource units needed by SFCI to be sent to the second terminal device by all receiving members according to the number Q of receiving members in the multicast group and the number K

The first terminal device determines that all receiving members can repeatedly send SFCI to the second terminal device on the available PSFCH feedback resources according to the number P and the SAnd the number re=mod (P, S) of redundant second resource units in the available PSFCH feedback resources;

The first terminal device determines, according to the index U _index of the first terminal device and the number K, a logical index of a frequency domain starting position of the frequency domain resource for transmitting the SFCI as follows:

if i < Re, determining that the frequency domain starting position of the frequency domain resource for transmitting SFCI is the ith× (rp+1) ×x second resource units of the available PSFCH feedback resource, and the number of repeated transmissions of SFCI is rp+1;

If i > =re, determining that the frequency domain starting position of the frequency domain resource for transmitting SFCI is the (re× (rp+1) + (i-Re) ×rp) ×x second resource units of the available PSFCH feedback resource, where the number of repeated transmissions of SFCI is Rp.

13. The method of claim 12, wherein the first terminal device repeatedly transmits the SFCI to the second terminal device based on a frequency domain starting position of the frequency domain resource and the number of repeated transmissions of SFCI, comprising:

If i < Re, the first terminal device transmits (rp+1) the SFCI times to the second terminal device through one PSFCH on (rp+1) X second resource units starting with the (rp+1) X second resource units;

If i > =re, the first terminal apparatus transmits Rp times the SFCI to the second terminal apparatus via one PSFCH on rp×x second resource units starting from the (re× (rp+1) + (i-Re) ×rp) ×x second resource units.

14. The method according to any one of claims 11-13, further comprising:

15. The method according to any one of claims 11 to 14, wherein,

The index U _index of the first terminal device is determined according to SFCI of the receiving members in the multicast group.

16. The method according to any one of claims 11-15, wherein,

The number of receiving members in the multicast group is notified to the first terminal device by the second terminal device.

17. A method for transmitting sidestream feedback control information SFCI, the method comprising:

The second terminal device determines the frequency domain resource for transmitting the SFCI and the repeated transmission times of the SFCI according to the available PSFCH feedback resource, the number Q of receiving members in the multicast group, the index U _index of the first terminal device and the number K; the X is the number of second resource units needed for transmitting SFCI, and the X is an integer greater than or equal to 1; the SFCI is configured to instruct the K terminal devices to correctly receive the sidestream data, where the K terminal devices include the first terminal device;

The second terminal device receives SFCI that the first terminal device repeatedly transmits on the frequency domain resource used for transmitting SFCI.

18. The method of claim 17, wherein the frequency domain resources for transmitting SFCI comprise frequency domain starting locations for transmitting the frequency domain resources of SFCI; the second terminal device determines the frequency domain resource for transmitting the SFCI and the repeated transmission times of the SFCI according to the available PSFCH feedback resource, the number Q of receiving members in the multicast group, the index U _index of the first terminal device, and the number K, and includes:

The second terminal device determines the number of second resource units needed by all receiving members to send SFCI once to the second terminal device according to the number Q of receiving members in the multicast group and the number K

The second terminal device determines that all receiving members can repeatedly send SFCI to the second terminal device on the available PSFCH feedback resources according to the number P and the SAnd the number re=mod (P, S) of redundant second resource units in the available PSFCH feedback resources;

the second terminal device determines, according to the index U _index of the first terminal device and the number K, a logical index of a frequency domain start position of the frequency domain resource for transmitting the SFCI as follows:

19. The method of claim 18, wherein the second terminal device receiving the SFCI of the repeated transmissions of the first terminal device on the frequency domain resources used to transmit the SFCI, comprises:

if i < Re, the second terminal device receives SFCI of (rp+1) times transmitted by the first terminal device through one PSFCH on (rp+1) X second resource units starting with the (rp+1) X second resource units;

If i > =re, the second terminal apparatus receives Rp times the SFCI transmitted by the first terminal apparatus through one PSFCH on rp×x second resource units starting from the (re× (rp+1) + (i-Re) ×rp) ×x second resource units.

20. The method according to any one of claims 17-19, further comprising:

The second terminal apparatus determines, based on the index U _index of the first terminal apparatus and the number L of the orthogonal code sequences that can be multiplexed in the X second resource units, that the received orthogonal code sequences used by the SFCI are an orthogonal code sequence with an index mod (2×u _index, L) and an orthogonal code sequence with an index mod (2×u _index +1, L).

21. The method according to any one of claims 17 to 20, wherein,

22. A first terminal device, comprising:

a receiving unit configured to receive sidestream data from a second terminal device; the transmission resource of the sidestream data comprises M first resource units, wherein M is a positive integer;

The processing unit is used for determining available physical sidestream feedback channel PSFCH feedback resources according to the sidestream data transmission resources; the available PSFCH feedback resources include P second resource units;

And determining the number K of terminal devices capable of transmitting the SFCI in the X second resource units according to the number of the orthogonal code sequences capable of multiplexing in the X second resource units and the number of the orthogonal code sequences required by the transmission side feedback control information SFCI; the X is the number of second resource units needed for sending SFCI, and the X and the K are integers greater than or equal to 1;

And determining a frequency domain resource for transmitting the SFCI according to the available PSFCH feedback resource, the index U _index of the first terminal device and the number K; the SFCI is configured to instruct the K terminal devices to correctly receive the sidestream data, where the K terminal devices include the first terminal device;

and a transmitting unit, configured to transmit the SFCI to the second terminal device according to the frequency domain resource used for transmitting SFCI.

23. The first terminal device of claim 22, wherein the frequency domain resources for transmitting SFCI comprise a frequency domain start position of the frequency domain resources for transmitting SFCI; the processing unit is used for:

determining a frequency domain starting position of the frequency domain resource for transmitting the SFCI as the available PSFCH feedback resource according to the index U _index of the first terminal device and the number K And a second resource unit.

24. The first terminal device of claim 23, wherein the first terminal device,

The transmitting unit is further configured to, in the first stepAnd transmitting the SFCI to the second terminal device through one PSFCH on X second resource units with the first second resource unit as the first second resource unit.

25. The first terminal device according to any of the claims 22-24, characterized in that,

The processing unit is further configured to determine, according to an index U _index of the first terminal device and the number L of the orthogonal code sequences that can be multiplexed in the X second resource units, that the orthogonal code sequence required for transmitting the SFCI is an orthogonal code sequence with an index mod (2×u _index, L) and an orthogonal code sequence with an index mod (2×u _index +1, L).

26. The first terminal device according to any of the claims 22-25, characterized in that,

27. A second terminal apparatus, comprising:

A transmitting unit configured to transmit side line data to a first terminal device; the transmission resource of the sidestream data comprises M first resource units, wherein M is a positive integer;

A receiving unit, configured to receive the SFCI from the first terminal device on a frequency domain resource used for transmitting the SFCI.

28. The second terminal device according to claim 27, wherein the processing unit is configured to:

29. The second terminal device according to claim 28, wherein,

The receiving unit is further configured to, in the first aspectThe SFCI is received from the first terminal device over one PSFCH on X second resource units, the first second resource unit being a first number of second resource units.

30. The second terminal device according to any of the claims 27-29, characterized in that,

The processing unit is further configured to determine, according to an index U _index of the first terminal device and the number L of the orthogonal code sequences that can be multiplexed in the X second resource units, that the orthogonal code sequence required for transmitting the SFCI is an orthogonal code sequence with an index mod (2×u _index +1, L) and an orthogonal code sequence with an index mod (2×u _index +1, L).

31. The second terminal device according to any of the claims 27-30, characterized in that,

32. A first terminal device, comprising:

and determining the frequency domain resource used for transmitting the SFCI and the repeated transmission times of the SFCI according to the available PSFCH feedback resource, the number Q of receiving members in the multicast group, the index U _index of the first terminal device and the number K; the SFCI is configured to instruct the K terminal devices to correctly receive the sidestream data, where the K terminal devices include the first terminal device;

And a transmitting unit configured to repeatedly transmit the SFCI to the second terminal apparatus according to the frequency domain resource used for transmitting the SFCI and the number of repeated transmissions of the SFCI.

33. The first terminal device of claim 32, wherein the frequency domain resources for transmitting SFCI comprise a frequency domain starting position for transmitting the frequency domain resources of SFCI; the processing unit is used for:

Determining the number of second resource units required by SFCI to be sent to the second terminal device by all receiving members according to the number Q of the receiving members in the multicast group and the number K

Determining, based on the number P and the S, a minimum number of times that all receiving members can repeatedly transmit SFCI to the second terminal device on the available PSFCH feedback resourcesAnd the number re=mod (P, S) of redundant second resource units in the available PSFCH feedback resources;

According to the index U _index of the first terminal device and the number K, determining a logical index of a frequency domain starting position of the frequency domain resource for transmitting the SFCI is:

34. The first terminal device of claim 33, wherein the first terminal device,

The transmitting unit is further configured to transmit (rp+1) times the SFCI to the second terminal device through one PSFCH on (rp+1) X second resource units starting from the (rp+1) X second resource units if the i < Re;

if i > =re, on rp×x second resource units starting from the (re× (rp+1) + (i-Re) ×rp) ×x second resource units, rp is transmitted to the second terminal apparatus by one PSFCH for SFCI times.

35. The first terminal device according to any of the claims 32-34, characterized in that,

36. The first terminal device according to any of the claims 32-35, characterized in that,

37. The first terminal device according to any of the claims 32-36, characterized in that,

38. A second terminal apparatus, comprising:

And determining frequency domain resources for transmitting the SFCI and the repeated transmission times of the SFCI according to the available PSFCH feedback resources, the number Q of receiving members in the multicast group, the index U _index of the first terminal device, and the number of multiplexing orthogonal code sequences in the X second resource units; the SFCI is configured to instruct the K terminal devices to correctly receive the sidestream data, where the K terminal devices include the first terminal device;

And a receiving unit, configured to receive, on a frequency domain resource used for transmitting the SFCI, the SFCI that is repeatedly transmitted by the first terminal device.

39. The second terminal apparatus of claim 38, wherein the frequency domain resources for transmitting SFCI comprise a frequency domain start position for transmitting the frequency domain resources of SFCI; the processing unit is used for:

40. The second terminal device of claim 39, wherein,

The receiving unit is further configured to receive, if the i < Re, (rp+1) times the SFCI transmitted by the first terminal device through one PSFCH on (rp+1) X second resource units starting from the (rp+1) X second resource units;

If i > =re, the SFCI is transmitted by the first terminal apparatus at rp×x second resource units starting from the (re× (rp+1) + (i-Re) ×rp) ×x second resource units through one PSFCH.

41. The second terminal device according to any of the claims 38-40, characterized in that,

The processing unit is further configured to determine, according to an index U _index of the first terminal device and the number L of the orthogonal code sequences that can be multiplexed in the X second resource units, that the received orthogonal code sequence used by the SFCI is an orthogonal code sequence with an index mod (2×u _index, L) and an orthogonal code sequence with an index mod (2×u _index +1, L).

42. The second terminal apparatus according to any of claims 38 to 41, wherein,

43. A first terminal device, the terminal device comprising one or more processors and one or more memories; the one or more memories are coupled with the one or more processors, the one or more memories for storing computer program code or computer instructions;

The computer instructions, when executed by the one or more processors, cause the terminal device to perform the method of transmitting side-by-side feedback control information SFCI as recited in any one of claims 1-5.

44. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions or programs, which when executed on a computer, cause the computer to perform the method of transmitting side-row feedback control information SFCI according to any one of claims 1-5.

45. A second terminal device, characterized in that the terminal device comprises one or more processors and one or more memories; the one or more memories are coupled with the one or more processors, the one or more memories for storing computer program code or computer instructions;

The computer instructions, when executed by the one or more processors, cause the terminal device to perform the method of transmitting side-by-side feedback control information SFCI as recited in any one of claims 6-10.

46. A computer readable storage medium, characterized in that the computer readable storage medium stores computer instructions or a program, which when run on a computer, causes the computer to perform the method of transmitting side-run feedback control information SFCI according to any one of claims 6-10.

47. A first terminal device, the terminal device comprising one or more processors and one or more memories; the one or more memories are coupled with the one or more processors, the one or more memories for storing computer program code or computer instructions;

the computer instructions, when executed by the one or more processors, cause the terminal device to perform the method of transmitting side-by-side feedback control information SFCI as recited in any one of claims 11-16.

48. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions or programs that, when executed on a computer, cause the computer to perform the method of transmitting side-row feedback control information SFCI according to any one of claims 11-16.

49. A second terminal device, characterized in that the terminal device comprises one or more processors and one or more memories; the one or more memories are coupled with the one or more processors, the one or more memories for storing computer program code or computer instructions;

the computer instructions, when executed by the one or more processors, cause the terminal device to perform the method of transmitting side-by-side feedback control information SFCI as recited in any one of claims 17-21.

50. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions or programs that, when executed on a computer, cause the computer to perform the method of transmitting side-row feedback control information SFCI according to any one of claims 17-21.