CN115567953A

CN115567953A - Data sending and receiving method and device

Info

Publication number: CN115567953A
Application number: CN202110753628.9A
Authority: CN
Inventors: 刘荣宽; 向铮铮; 卢磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-07-02
Filing date: 2021-07-02
Publication date: 2023-01-03
Also published as: WO2023274182A1

Abstract

The application provides a data sending and receiving method and device, relates to the technical field of communication, and is used for solving the problem of multicast service transmission resource waste and improving the utilization rate of frequency spectrum. The method comprises the following steps: the method comprises the steps that first equipment sends channel Sounding Reference Signal (SRS) configuration information to at least one terminal device in a first multicast group, wherein the SRS configuration information indicates a first time-frequency resource used for sending an SRS, a sequence of the SRS and an antenna port used for sending the SRS; the method comprises the steps that first equipment receives at least one SRS from at least one terminal device on a first time-frequency resource, and determines multicast channel state information based on the at least one SRS, wherein the time-frequency resources carrying the at least one SRS are the same, and the sequences of the at least one SRS are the same; the first equipment determines physical layer packet broadcast beam forming or a pre-coding matrix according to the multicast channel state information; the first equipment sends multicast data to at least one terminal equipment according to the physical layer multicast beamforming or the pre-coding matrix.

Description

Data sending and receiving method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a data sending and receiving method and apparatus.

Background

In a Long Term Evolution (LTE) system to a New Radio (NR) system, a link between a User Equipment (UE) and a base station for transmitting data is referred to as an uplink (a link from the UE to the base station) or a downlink (a link from the base station to the UE), and a link between UEs for transmitting data is referred to as a Sidelink (SL). The sidelink may be generally applied to a vehicle to all (V2X) scenario, or a device to device (D2D) and other direct communication scenarios. Based on the demands of different user devices on the same data content, the downlink and the sidelink can support unicast, multicast and broadcast.

At present, a beam forming or precoding technology may be used, that is, a directional beam is generated by adjusting a phase, a signal amplitude, transmission power, and the like of a transmission signal, so that a signal coverage area may be enlarged, an edge throughput may be improved, an interference problem may be suppressed, and the like, to effectively improve a system spectrum efficiency, and solve a resource waste problem. The base station needs to acquire Channel State Information (CSI) for beamforming or precoding techniques of a downlink.

Specifically, the UE may send a Sounding Reference Signal (SRS), and the base station may obtain channel state information between the UE and the base station by measuring and estimating and using channel reciprocity. In addition, the base station may send a Reference Signal (RS) of Channel State Information (CSI) to the UE, and the UE may obtain the CSI by measuring the CSI-RS and then send a CSI report to the base station, so that the base station may obtain the Channel State Information between the UE and the base station based on the CSI report.

However, for the physical layer of the electronic device, the same service data is transmitted through different time-frequency resources, which may cause waste of air interface resources. Alternatively, the sending end device may send the same service data in a Space Division Multiple Access (SDMA) manner, but the transmission power of the signal is allocated to different UEs, and there is mutual interference between the transmission signals of different UEs, so that the transmission power of the signal is not effectively utilized. Therefore, a more efficient physical layer multicast technology needs to be researched to solve the problem of transmission resource waste in the multicast service.

Disclosure of Invention

The application provides a data sending and receiving method and device, which can reduce the transmission resource waste in multicast services and effectively improve the spectrum utilization rate.

In a first aspect, a data transmitting and receiving method is provided, which may be executed by a first device, or may be executed by a chip applied to the first device, and the following only takes an execution subject as an example of the first device. The method comprises the following steps: the method comprises the steps that first equipment sends channel Sounding Reference Signal (SRS) configuration information to at least one terminal device in a first multicast group, wherein the SRS configuration information indicates a first time-frequency resource used for sending an SRS, a sequence of the SRS and an antenna port used for sending the SRS; the method comprises the steps that first equipment receives at least one SRS from at least one terminal device on a first time-frequency resource, and determines multicast channel state information based on the at least one SRS, wherein the time-frequency resources carrying the at least one SRS are the same, and the sequences of the at least one SRS are the same; the first equipment determines physical layer packet broadcast beam forming or a pre-coding matrix according to the multicast channel state information; the first device sends multicast data to at least one terminal device according to physical layer multicast beamforming or a precoding matrix.

In the above technical solution, for a multicast communication scenario between a transmitting side device (first device) and multiple receiving side devices, the first device may configure SRS configuration information (for example, may be multicast-specific SRS configuration information) for at least one terminal device, at least one terminal device in a multicast group may transmit an SRS with the same sequence to the first device on the same time-frequency resource, and at least one SRS on the same time-frequency resource may be regarded as an integrated SRS for the transmitting side device, so as to implement effective measurement of a multicast channel by the transmitting side device, and obtain channel state information of the multicast channel. Therefore, the first device can determine the physical layer multicast beamforming or the precoding matrix according to the channel state information of the multicast channel, and is used for sending multicast data to at least one terminal device in the first multicast group, so that the utilization rate of the physical layer multicast on frequency spectrum resources is improved, and the waste of transmission resources in the multicast service is reduced as much as possible.

In one embodiment, the at least one SRS is transmitted through the same antenna port.

In the above possible implementation manner, the multiple terminal devices send SRS from the same antenna port to the first device, and at least one SRS is used for the first device to measure and estimate the multicast channel between the first device and the multiple receiving-side devices, so that the at least one SRS sent from the same time-frequency resource and the same port can improve the effectiveness of multicast channel measurement and improve the accuracy of multicast channel measurement.

In one embodiment, the method further comprises: the method comprises the steps that first equipment receives at least one piece of antenna port indication information from at least one piece of terminal equipment, wherein the antenna port indication information is used for indicating the number of antenna ports of corresponding terminal equipment or a set of antenna port indexes of corresponding terminal equipment; and the first equipment determines an antenna port for transmitting the SRS according to the at least one antenna port indication message.

In the above possible embodiment, at least one terminal device reports respective antenna port indication information, for example, the number of antenna ports or a set of antenna port indexes supported by the terminal device, to the first device, so that the first device may determine, according to the antenna port indication information of the plurality of terminal devices, an antenna port used for sending the SRS, so that each terminal device sends the SRS using the same antenna port, and accuracy and flexibility of multicast channel measurement are improved.

In one embodiment, the method further comprises: the first device sends first control information to at least one terminal device according to physical layer multicast beamforming or a precoding matrix, wherein the first control information is used for indicating time-frequency resources of multicast data, and the first control information further comprises a group identifier of a first multicast group.

In the above possible embodiment, after determining the physical layer multicast beamforming or precoding matrix, the first device may multicast and send the first control information to the at least one terminal device according to the physical layer multicast beamforming or precoding matrix, where the first control information may specifically be SCI or DCI, and is used to notify the at least one terminal device of a time-frequency resource for transmitting multicast data, so that beam coverage of the first control information and effectiveness of communication may be improved. In addition, the first device does not need to send the first control information to at least one terminal device independently, signaling overhead can be effectively saved, communication resources are saved, and the efficiency of a communication system is improved.

In an embodiment, the multicast data is carried in a second time-frequency resource, where the second time-frequency resource is the same as the frequency-domain resource of the first time-frequency resource, or the frequency-domain resource of the second time-frequency resource is a subset of the frequency-domain resource of the first time-frequency resource.

In the above possible implementation manner, the first device may perform multicast channel measurement on the multicast channel bandwidth through the received at least one SRS, and transmit multicast data may occupy part or all of the measured bandwidth of the multicast channel, so that the effectiveness of multicast channel measurement and utilization is improved, the efficiency of multicast data transmission is improved, and the data transmission performance of the communication system is improved.

In one embodiment, the first device is a network device, or the first device is an end device in the first multicast group.

In the above possible implementation, when the first device is a network device, the scheme is applicable to measurement of a downlink multicast channel and transmission of downlink multicast data; when the first device is a terminal device at a sending side in the first multicast group, the scheme can also be suitable for multicast channel measurement of a sidelink and transmission of sideline multicast data, the technical scheme is universal and flexible, and the data transmission efficiency of multicast communication is improved, so that the data transmission performance of a communication system is improved.

In an embodiment, the first device sends one SRS configuration information to at least one terminal device, or the first device sends corresponding SRS configuration information to each terminal device of the at least one terminal device, and the SRS configuration information corresponding to each terminal device is the same.

In the foregoing possible embodiment, after the first multicast group is formed into a group, the first device may send the group-specific SRS configuration information corresponding to the first multicast group to at least one terminal device through one signaling, so that communication signaling may be effectively saved. If the first device sends the same SRS configuration information to each of the at least one terminal device before the first multicast is grouped, the flexibility and the realizability of the SRS configuration information are improved.

In a second aspect, a method for acquiring multicast channel status information is provided, where the method may be performed by a first terminal device, and may also be performed by a chip applied to the first terminal device, and the following only takes the execution subject as an example of the first terminal device. The method comprises the following steps: the method comprises the steps that a first terminal device receives channel Sounding Reference Signal (SRS) configuration information from a first device, wherein the SRS configuration information indicates a first time-frequency resource for transmitting an SRS, a sequence of the SRS and an antenna port for transmitting the SRS; a first terminal device sends a first SRS to a first device on a first time-frequency resource, the first terminal device belongs to a first multicast group, the first time-frequency resource bears at least one SRS from at least one terminal device in the first multicast group, the first SRS belongs to the at least one SRS, and the at least one SRS is used for the first device to determine multicast channel state information; the first terminal device receives multicast data from the first device.

In one embodiment, the method further comprises: the method comprises the steps that a first terminal device sends antenna port indication information to the first device, wherein the antenna port indication information is used for indicating the number of antenna ports of the first terminal device or a set of antenna port indexes of the first terminal device; the antenna port indication information is used for the first device to determine an antenna port for transmitting the SRS.

In one embodiment, the method further comprises: the first terminal device receives first control information from the first device, wherein the first control information is used for indicating time-frequency resources of multicast data, the first control information further includes a group identifier of a first multicast group, and the first control information is sent by the first device according to physical layer multicast beamforming or a precoding matrix.

In one embodiment, the first device is a network device, or the first device is a terminal device in a first multicast group.

In a third aspect, a method for acquiring multicast channel status information is provided, where the method may be performed by a first device, or may be performed by a chip applied to the first device, and hereinafter, only an execution subject is taken as an example of the first device. The method comprises the following steps: the first equipment sends at least one piece of first configuration information to at least one piece of terminal equipment in a first multicast group, wherein the first configuration information is used for indicating time-frequency resources of a Channel State Information (CSI) report; the method comprises the steps that first equipment sends a channel state information reference signal (CSI-RS) to at least one terminal device; the first device receiving at least one CSI report from at least one terminal device; the first equipment determines physical layer multicast beamforming or a precoding matrix according to at least one CSI report; the first device sends multicast data to at least one terminal device according to physical layer multicast beamforming or a precoding matrix.

In the above technical solution, for a multicast channel between one sending side device (first device) and a plurality of receiving side devices, the first device may configure first configuration information, that is, configuration information of a CSI report specific to the multicast channel, for at least one terminal device, so that the first device may determine channel state information of the multicast channel between the first device and at least one terminal device according to CSI reports fed back by different terminal devices on a time-frequency resource indicated by the first configuration information. The first device may determine a physical layer multicast beamforming or a precoding matrix suitable for multicast transmission according to the channel state information of the multicast channel, and is configured to send multicast data, thereby improving the utilization rate of the physical layer multicast on spectrum resources, and reducing transmission resource waste in the multicast service as much as possible.

In one embodiment, the first configuration information includes a first time limit, and the first configuration information is used for instructing the at least one terminal device to send the CSI report within the first time limit.

In the above possible implementation manner, the first configuration information may include a time domain constraint, that is, a first time limit, included in the CSI sent by the terminal device, so that the first device may limit different terminal devices in the multicast group to report the CSI report within a preset time constraint, and it may be considered that the change of the channel state may be negligible within the first time limit, so that the first device may determine, according to the channel state information reflected by the multiple CSI reports, that the multicast channel state information may be more accurate, and effectively improve the utilization rate of the multicast channel.

In one embodiment, the first configuration information is used to indicate a period and a starting time point of time-frequency resources of a channel state information, CSI, report.

In the above possible embodiment, the first device may configure the CSI report reporting mode of the terminal device to be periodic, and the first device may include, in the first configuration information, a time domain constraint that the terminal device periodically sends a CSI report, that is, a sending period and a starting time point, so that the first device may limit different terminal devices in the multicast group to synchronously report the CSI report at a preset starting time and report the CSI report at the same period, so that the first device may determine, according to channel state information reflected by multiple CSI reports, that the multicast channel state information is more instantaneous, more accurate, and effectively improve the utilization rate of the multicast channel.

In one embodiment, the method further comprises: the first device sends a control unit MAC CE of a media access control layer to at least one terminal device, and the control unit MAC CE is used for instructing the at least one terminal device to send a CSI report to the first device.

In the above possible embodiments, the first device may further configure the CSI report reporting mode of the terminal device as semi-static, that is, the first device sends the MAC CE to at least one terminal device to instruct the terminal device to send the CSI report to the first device, so as to improve flexibility of reporting the CSI report by the terminal device.

In one embodiment, the method further comprises: and the first equipment sends second control information to the at least one terminal equipment, wherein the second control information is used for indicating the at least one terminal equipment to send the CSI report and the instantaneity to the first equipment.

In the above possible embodiments, the CSI report reporting mode of the terminal device may also be aperiodic, that is, the first device sends the second control information to at least one terminal device, where the second control information may specifically be SCI or DCI, and the second control information may be used to instruct the terminal device to send the CSI report to the first device, so as to improve flexibility and immediacy of reporting the CSI report by the terminal device.

In one embodiment, the method further comprises: the first device sends third control information to at least one terminal device according to physical layer multicast beamforming or a precoding matrix, wherein the third control information is used for indicating time-frequency resources of multicast data, and the third control information further includes a group identifier of the first multicast group.

In the above possible implementation manner, after determining the physical layer multicast beamforming or precoding matrix, the first device may send third control information to the at least one terminal device according to the physical layer multicast beamforming or precoding matrix, where the third control information may specifically be SCI or DCI, and the third control information may be used to notify the at least one terminal device of a time-frequency resource for transmitting multicast data, so that beam coverage and communication effectiveness of the third control information may be improved. In addition, the first device does not need to multicast and send the third control information to at least one terminal device independently, signaling overhead can be effectively saved, communication resources are saved, and the efficiency of a communication system is improved.

In one embodiment, the CSI-RS is carried in a first frequency domain resource, and the multicast data is carried in a second frequency domain resource, where the second frequency domain resource is the same as the first frequency domain resource, or the second frequency domain resource is a subset of the first frequency domain resource.

In the possible implementation manner, the first device may perform multicast channel measurement on the multicast channel bandwidth by sending the CSI-RS and receiving the at least one CSI report, and the sending of the multicast data may occupy a part or all of the measured bandwidth of the multicast channel, so as to obtain a frequency domain diversity gain, improve the efficiency of multicast data transmission, and thereby improve the data transmission performance of the communication system.

In an embodiment, the first device sends one piece of first configuration information to at least one terminal device, or the first device sends corresponding first configuration information to each terminal device in the at least one terminal device, and the first configuration information corresponding to each terminal device is the same.

After the first multicast group is grouped, the first device may send configuration information of a CSI report corresponding to the first multicast group to at least one terminal device through one signaling, so that communication signaling may be effectively saved. If the first device sends the same CSI report configuration information to each of the at least one terminal device before the first multicast is grouped into a group, the flexibility and the realizability of CSI report resource configuration are improved.

In a fourth aspect, a method for acquiring multicast channel status information is provided, where the method may be executed by a first terminal device, and may also be executed by a chip applied in the first terminal device, and the execution subject is only taken as an example of the first terminal device in the following. The method comprises the following steps: the method comprises the steps that first terminal equipment receives first configuration information from first equipment, wherein the first configuration information is used for indicating time-frequency resources of a Channel State Information (CSI) report; the first terminal equipment receives a channel state information reference signal (CSI-RS) from the first equipment; the method comprises the steps that a first terminal device sends a first CSI report to a first device according to a CSI-RS, the first terminal device belongs to a first multicast group, a time-frequency resource carrying the first CSI report also carries at least one CSI report from at least one terminal device in the first multicast group, the first CSI belongs to the at least one CSI report, and the CSI report is used for the first device to determine multicast channel state information; the first terminal device receives multicast data from the first device.

In one embodiment, the first configuration information includes a first time limit, and the first configuration information is used for instructing the first terminal device to transmit the first CSI report within the first time limit.

In one embodiment, the first configuration information is used to indicate a period and a starting time point of a time-frequency resource for the first terminal device to transmit the first CSI report.

In one embodiment, the method further comprises: the method comprises the steps that first terminal equipment receives a control unit MAC CE from a media access control layer of the first equipment; and the terminal equipment sends the first CSI report to the first equipment according to the MAC CE.

In one embodiment, the method further comprises: the first terminal equipment receives second control information from the first equipment; and the terminal equipment sends the first CSI report to the first equipment according to the second control information.

In one embodiment, the method further comprises: the first terminal device receives third control information from the first device, where the third control information is used to indicate a time-frequency resource of multicast data, where the third control information further includes a group identifier of the first multicast group, and the third control information is sent by the first device according to physical layer multicast beamforming or a precoding matrix.

In an embodiment, the first CSI-RS is carried in a first frequency domain resource, and the multicast data is carried in a second frequency domain resource, where the second frequency domain resource is the same as the first frequency domain resource, or the second frequency domain resource is a subset of the first frequency domain resource.

In a fifth aspect, a communication apparatus is provided, and the communication apparatus includes a transmitting module, a receiving module, and a processing module, where the transmitting module is configured to transmit, to at least one terminal device in a first multicast group, SRS configuration information indicating a first time-frequency resource used for transmitting an SRS, a sequence of the SRS, and an antenna port used for transmitting the SRS; the receiving module is configured to receive at least one SRS from at least one terminal device on a first time-frequency resource, and determine multicast channel state information based on the at least one SRS, where the time-frequency resources carrying the at least one SRS are the same, and sequences of the at least one SRS are the same; the processing module is used for determining physical layer multicast beam forming or a pre-coding matrix according to the multicast channel state information; the sending module is further configured to send multicast data to at least one terminal device according to physical layer multicast beamforming or a precoding matrix.

In one embodiment, at least one SRS is transmitted through the same antenna port.

In one embodiment, the receiving module is further configured to receive at least one antenna port indication information from at least one terminal device, where the antenna port indication information is used to indicate the number of antenna ports of the corresponding terminal device, or a set of antenna port indexes of the corresponding terminal device; the processing module is further configured to determine an antenna port for transmitting the SRS according to the at least one antenna port indication information.

In an embodiment, the sending module is further configured to send first control information to the at least one terminal device according to physical layer multicast beamforming or a precoding matrix, where the first control information is used to indicate a time-frequency resource of multicast data, and the first control information further includes a group identifier of the first multicast group.

In one embodiment, the communication device is a network device, or the communication device is a terminal device in the first multicast group. Or a chip applied in a network device or a terminal or other combined devices with the functions of the network device or the terminal device.

When the communication device is a network device or a terminal device, or a combined device capable of implementing the functions of the network device or the terminal device, the receiving module may be a receiver, may include an antenna, a radio frequency circuit, and the like, the processing module may be a processor, the transmitting module may be a transmitter, may include an antenna, a radio frequency circuit, and the like, and the receiver and the transmitter may be an integrated transceiver. When the communication device is a component having the functions of the network device or the terminal device, the receiving module may be a radio frequency unit, the processing module may be a processor, and the transmitting module may be a radio frequency unit. When the communication device is a system-on-chip applied to a network device or a terminal, the receiving module may be an input interface of the system-on-chip, and the processing module may be a processor of the system-on-chip, such as: the sending module may be an output interface of the system on chip. The chip system may be a System On Chip (SOC), a baseband chip, and the like, wherein the baseband chip may include a processor, a channel encoder, a digital signal processor, a modem, an interface module, and the like.

In an embodiment, the sending module is further configured to send one SRS configuration information to at least one terminal device, or the sending module is further configured to send corresponding SRS configuration information to each terminal device in the at least one terminal device, where the SRS configuration information corresponding to each terminal device is the same.

In a sixth aspect, a communication apparatus is provided, and includes a receiving module and a transmitting module, where the receiving module is configured to receive channel sounding reference signal, SRS, configuration information from a first device, and the SRS configuration information indicates a first time-frequency resource used for transmitting an SRS, a sequence of the SRS, and an antenna port used for transmitting the SRS; the sending module is used for sending SRS to the first equipment on the first time-frequency resource, and the SRS is used by the first equipment for determining the multicast channel state information of the first multicast group according to at least one SRS; the receiving module is further configured to receive multicast data from the first device.

In one embodiment, the SRS is transmitted through a preset antenna port, or the SRS is transmitted through an antenna port indicated in the SRS configuration information.

In one embodiment, the sending module is further configured to send, to the first device, antenna port indication information, where the antenna port indication information is used to indicate the number of antenna ports of the communication apparatus, or a set of antenna port indexes of the communication apparatus; the antenna port indication information is used for the first device to determine an antenna port for transmitting the SRS.

In an implementation manner, the receiving module is further configured to receive first control information from the first device, where the first control information is used to indicate a time-frequency resource of multicast data, where the first control information further includes a group identifier of a first multicast group, and the first control information is sent by the first device according to physical layer multicast beamforming or a precoding matrix.

In one embodiment, the first device is a network device, or the first device is a terminal device in a first multicast group. Or a chip applied in a network device or a terminal or other combined devices with the functions of the network device or the terminal device.

When the communication device is a network device or a terminal device, or a combined device capable of implementing the functions of the network device or the terminal device, the receiving module may be a receiver, may include an antenna, a radio frequency circuit, and the like, the processing module may be a processor, the transmitting module may be a transmitter, may include an antenna, a radio frequency circuit, and the like, and the receiver and the transmitter may be an integrated transceiver. When the communication device is a component having the functions of the network device or the terminal device, the receiving module may be a radio frequency unit, the processing module may be a processor, and the transmitting module may be a radio frequency unit. When the communication apparatus is a chip system applied in a network device or a terminal, the receiving module may be an input interface of the chip system, and the processing module may be a processor of the chip system, for example: the sending module may be an output interface of the system on chip. The chip system may be a System On Chip (SOC), a baseband chip, and the like, wherein the baseband chip may include a processor, a channel encoder, a digital signal processor, a modem, an interface module, and the like.

In a seventh aspect, a communication apparatus is provided and includes a sending module, a receiving module, and a processing module, where the sending module is configured to send at least one first configuration information to at least one terminal device in a first multicast group, and the first configuration information is used to indicate time-frequency resources of a CSI report; the sending module is further used for sending a channel state information reference signal CSI-RS to at least one terminal device; the receiving module is used for receiving at least one CSI report from at least one terminal device; the processing module is used for determining physical layer multicast beamforming or a precoding matrix according to at least one CSI report; the sending module is further configured to send multicast data to at least one terminal device according to the physical layer multicast beamforming or the precoding matrix.

In one embodiment, the first configuration information includes a first time limit, and the first configuration information is used for instructing the at least one terminal device to transmit the CSI report within the first time limit.

In one embodiment, the sending module is further configured to send a control element MAC CE of a medium access control layer to the at least one terminal device, for instructing the at least one terminal device to send the CSI report to the communication apparatus.

In one embodiment, the sending module is further configured to send second control information to the at least one terminal device, for instructing the at least one terminal device to send the CSI report to the communication apparatus.

In an embodiment, the sending module is further configured to send third control information to the at least one terminal device according to physical layer multicast beamforming or a precoding matrix, where the third control information is used to indicate a time-frequency resource of multicast data, and the third control information further includes a group identifier of the first multicast group.

In one embodiment, the communication device is a network device, or the communication device is a terminal device in the first multicast group.

In an embodiment, the sending module is configured to send a piece of first configuration information to at least one terminal device, or the sending module is configured to send corresponding first configuration information to each terminal device of the at least one terminal device, where the corresponding first configuration information of each terminal device is the same.

In an eighth aspect, a communication apparatus is provided and includes a receiving module, a processing module, and a transmitting module, where the receiving module is configured to receive first configuration information from a first device, and the first configuration information is used to indicate time-frequency resources of a CSI report; the receiving module is further used for receiving a channel state information reference signal (CSI-RS) from the first device; the processing module is used for sending a CSI report to the first equipment according to the CSI-RS, and the CSI report is used for the first equipment to determine multicast channel state information of the first multicast group according to at least one CSI report; the receiving module is further configured to receive multicast data from the first device.

In one embodiment, the first configuration information includes a first time limit, and the first configuration information is used to instruct the communication apparatus to transmit the CSI report within the first time limit.

In one embodiment, the first configuration information is used to indicate a period and a starting time point of a time-frequency resource for the communication apparatus to transmit a CSI report.

In one embodiment, the receiving module is further configured to receive a control unit MAC CE from a media access control layer of the first device; the transmitting module is further configured to transmit the CSI report to the first device according to the MAC CE.

In one embodiment, the receiving module is further configured to receive second control information from the first device; the transmitting module is further configured to transmit the CSI report to the first device by using the second control information.

In an embodiment, the receiving module is further configured to receive third control information from the first device, where the third control information is used to indicate a time-frequency resource of multicast data, where the third control information further includes a group identifier of the first multicast group, and the third control information is sent by the first device according to physical layer multicast beamforming or a precoding matrix.

In an embodiment, the CSI-RS is carried in a first frequency domain resource, and the multicast data is carried in a second frequency domain resource, where the second frequency domain resource is the same as the first frequency domain resource, or the second frequency domain resource is a subset of the first frequency domain resource.

In a ninth aspect, a communication device is provided, the communication device comprising a processor and a communication interface; the communication interface is for communicating with a module external to the communication device, and the processor is for executing a computer program or instructions to implement the method according to any one of the first aspect above, or to implement the method according to any one of the third aspect above.

In a tenth aspect, there is provided a communication apparatus comprising: a processor and a communication interface; the communication interface is for communicating with a module external to the communication device, and the processor is for executing a computer program or instructions to implement the method according to any of the second aspects above, or to implement the method according to any of the fourth aspects above.

In an eleventh aspect, there is provided a computer readable storage medium, comprising computer program instructions, which, when run on a communication apparatus, cause the communication apparatus to perform the method according to any of the first aspect above, or the communication apparatus to perform the method according to any of the third aspect above.

In a twelfth aspect, there is provided a computer-readable storage medium, comprising a computer program which, when run on a computer, causes the computer to perform the method according to any of the second aspects above, or the computer performs the method according to any of the fourth aspects above.

A thirteenth aspect provides a computer program product for causing a communication device to perform the method of any of the first or third aspects as described above when the computer program product is run on the communication device.

A fourteenth aspect provides a computer program product for causing a communication device to perform the method of any one of the second or fourth aspects as described above when the computer program product is run on the communication device.

A fifteenth aspect provides a communication system comprising a communication device as described in the fifth aspect above, and a communication device as claimed in the sixth aspect.

A sixteenth aspect provides a communication system comprising a communication device as described in the seventh aspect above, and a communication device as described in the eighth aspect.

It is understood that any of the communication device, the computer-readable storage medium, the computer program product and the communication system provided above can be implemented by the corresponding method provided above, and therefore, the beneficial effects achieved by the method can be referred to the beneficial effects in the corresponding method provided above, and are not described herein again.

Drawings

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

fig. 2 is a system architecture diagram of a communication device according to an embodiment of the present application;

fig. 3-fig. 7 are schematic first to fifth flowcharts illustrating a method for acquiring multicast channel status information according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of another communication device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments.

The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and the above-described drawings are used for distinguishing between different objects and not for limiting a particular order. Furthermore, the terms "include" 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 steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, interfaces, techniques, etc., in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known mobile devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

In addition, the term "and/or" herein is only one kind of association relationship describing the association object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship. First, in order to facilitate understanding of the present application, communication technologies and network architectures involved in the embodiments of the present application are briefly described.

The technical solution provided in the embodiment of the present application may be used in any communication system supporting sidelink communication, where the communication system may be a third generation partnership project (3 rd generation partnership project,3 GPP) communication system, such as a Long Term Evolution (LTE) system, a fifth generation (5 g) mobile communication system, a New Radio (NR) system, a vehicle-to-anything (V2X) system, and other next generation communication systems, and may also be a non-3 GPP communication system, which is not limited. The method provided by the embodiment of the present application is described below by taking fig. 1 as an example.

Fig. 1 is a schematic diagram illustrating an implementation environment of a communication system according to an embodiment of the present application. As shown in fig. 1, in an embodiment of the present application, there is provided a communication system that may include: at least two terminal devices, which are in one multicast group, for example, the first multicast group may include UE1 and UE2. The communication system may further comprise at least one network device, which may transmit multicast data to at least two terminal devices. Alternatively, the communication system may further include a terminal device, and the terminal device may also transmit multicast data to at least two terminal devices UE1 and UE2, for example, as shown in fig. 1, the communication system may further include a vehicle UE3.

In the NR system, there are two air interfaces, the Uu interface and the PC5 interface. The Uu port may be used for communication between the terminal device and the network device, and the PC5 port may be used for SL communication between the terminal device and the terminal device. In the embodiments of the present application, the term "wireless communication" may also be simply referred to as "communication", and the term "communication" may also be described as "data transmission", "information transmission", or "transmission".

As shown in fig. 1, a data communication link from a terminal device to a network device is called Uplink (UL), a data communication link from a network device to a terminal device is called Downlink (DL), and the network device can transmit multicast data to at least two terminal devices UE1 and UE2 through a Uu port. The terminal device UE3 may send multicast data to at least two terminal devices UE1 and UE2 through the PC5 port, where the terminal device UE3 may serve as a terminal device at a sending end in a multicast group, and the terminal devices UE1 and UE2 may serve as terminal devices at a receiving end in the multicast group.

When the UE1 and the UE2 send the same service request to the same source terminal (e.g. network device, or terminal device such as UE 3), the source terminal sends service data to the physical layer of the source terminal according to the service request, and the source terminal sends the same service data to the UE1 and the UE2 through the physical layer. The same service data may be referred to as multicast data of the physical layer.

In this application, the network device may be any device having a wireless transceiving function. Including but not limited to: an evolved Node B (NodeB or eNB or e-NodeB, evolved Node B) in a Long Term Evolution (Long Term Evolution, LTE) system, a base station (gnnodeb or gNB) or a Transmission Reception Point (TRP) in an NR, a base station of a 3GPP subsequent Evolution, an access Node in a WiFi system, a wireless relay Node, a wireless backhaul Node, and the like. The base station may be: a macro base station, a micro base station, a pico base station, a small station, a relay station, or a balloon station, etc. Multiple base stations may support the same technology network mentioned above, or different technologies networks mentioned above. The base station may contain one or more co-sited or non co-sited TRPs. The network device may also be a wireless controller, a Centralized Unit (CU), and/or a Distributed Unit (DU) in a Cloud Radio Access Network (CRAN) scenario. The network device may also be a server, a wearable device, or a vehicle device, etc. The following description will take a network device as an example of a base station. The multiple network devices may be base stations of the same type or different types. The base station may communicate with the terminal device, and may also communicate with the terminal device through the relay station. The terminal device may communicate with a plurality of base stations of different technologies, for example, the terminal device may communicate with a base station supporting an LTE network, may communicate with a base station supporting a 5G network, and may support dual connectivity with the LTE network base station and the 5G network base station.

The terminal equipment has a wireless transceiving function, can be deployed on land and comprises an indoor or outdoor, a handheld, a wearable or a vehicle-mounted terminal; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal device may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a vehicle terminal device, a wireless terminal in unmanned driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in city (smart city), a wireless terminal in smart home (smart home), a wearable terminal device, and the like. The embodiments of the present application do not limit the application scenarios. A terminal device may also be sometimes referred to as a user equipment UE, an access terminal device, a vehicle mounted terminal, an industrial control terminal, a UE unit, a UE station, a mobile station, a remote terminal device, a mobile device, a UE terminal device, a wireless communication device, a UE agent, or a UE device, etc. The terminal equipment may also be fixed or mobile.

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 besides the devices shown in fig. 1. In addition, names of the respective devices in fig. 1 are not limited, and the respective devices may be named by other names in addition to the names shown in fig. 1 without limitation.

In a specific implementation, each network element shown in fig. 1 is as follows: the terminal device and the network device may adopt the composition structure shown in fig. 2 or include the components shown in fig. 2. Fig. 2 is a schematic structural diagram of a communication apparatus 200 according to an embodiment of the present application, where when the communication apparatus 200 has a function of the terminal device according to the embodiment of the present application, the communication apparatus 200 may be a terminal device or a chip or a system on a chip in the terminal device. When the communication apparatus 200 has the functions of the network device according to the embodiment of the present application, the communication apparatus 200 may be a network device or a chip or a system on a chip in the network device.

As shown in fig. 2, the communication device 200 may include a processor 201, a communication line 202, and a communication interface 203. Further, the communication apparatus 200 can also include a memory 204. The processor 201, the memory 204 and the communication interface 203 may be connected via a communication line 202.

The Processor 201 may be a Central Processing Unit (CPU), a general Processor Network Processor (NP), a Digital Signal Processor (DSP), a microprocessor, a microcontroller, a programmable logic device, or any combination thereof. The processor 201 may also be other means with processing functionality such as a circuit, a device, or a software module.

A communication line 202 for transmitting information between the respective components included in the communication apparatus 200.

A communication interface 203 for communicating with other devices or other communication networks. The other communication Network may be an ethernet Network, a Radio Access Network (RAN), a Wireless Local Area Network (WLAN), or the like. The communication interface 203 may be an interface circuit, pin, radio frequency module, transceiver, or any device capable of enabling communication.

A memory 204 for storing instructions. Wherein the instructions may be a computer program.

The Memory 204 may be a Read-only Memory (ROM) or other types of static storage devices that can store static information and/or instructions, a Random Access Memory (RAM) or other types of dynamic storage devices that can store information and/or instructions, an Electrically Erasable Programmable Read-only Memory (EEPROM), a Compact disc Read-only Memory (CD-ROM) or other optical disc storage, magnetic disc storage media or other magnetic storage devices, and the optical disc storage includes a Compact disc, a laser disc, an optical disc, a digital versatile disc, or a blu-ray disc.

It should be noted that the memory 204 may exist independently from the processor 201, or may be integrated with the processor 201. The memory 204 may be used for storing instructions or program code or some data etc. The memory 204 may be located inside the communication device 200 or outside the communication device 200, which is not limited. The processor 201 is configured to execute the instructions stored in the memory 204 to implement the methods provided by the embodiments described below.

In one example, processor 201 may include one or more CPUs, such as CPU0 and CPU1 in fig. 2.

As an alternative implementation, the communication device 200 includes multiple processors, for example, the processor 207 may be included in addition to the processor 201 in fig. 2.

As an alternative implementation, the communication apparatus 200 further comprises an output device 205 and an input device 206. Illustratively, the input device 206 is a keyboard, mouse, microphone, or joystick, among other devices, and the output device 205 is a display screen, speaker, among other devices.

It should be noted that the communication apparatus 200 may be a wearable device, a desktop computer, a portable computer, a network server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system, or a device with a similar structure as that in fig. 2. Further, the constituent structures shown in fig. 2 do not constitute limitations on the communication apparatus, which may include more or fewer components than those shown in fig. 2, or a combination of certain components, or a different arrangement of components, in addition to the components shown in fig. 2.

In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices.

For example, the apparatus 200 may be a chip system, which may include at least one or more processors and transceiver circuits as shown in fig. 2, and program instructions related to the method described in the embodiment of the present application are executed in the one or more processors, so that the chip system implements the method of the present application.

In addition, acts, terms, and the like referred to between the embodiments of the present application may be mutually referenced and are not limited. In the embodiment of the present application, the name of the message exchanged between the devices or the name of the parameter in the message, etc. are only an example, and other names may also be used in the specific implementation, which is not limited.

Next, taking the communication system shown in fig. 1 as an example, the implementation provided by the embodiment of the present application will be described with reference to the corresponding drawings. Among them, each device in the following embodiments may have the components shown in fig. 2. All actions, terms, etc. referred to between the embodiments of the present application may be mutually referred to, without limitation. In the embodiment of the present application, the name of the message or the name of the parameter in the message that is interacted between the devices is only an example, and other names may also be used in specific implementation, which is not limited.

The embodiment of the application provides a method for sending and receiving data. The method may be applied between a first device and at least one terminal device. The first device may be a network device or a terminal device. Specifically, as shown in fig. 3, the method may include:

301: the first device sends SRS configuration information to at least one terminal device in the first multicast group, wherein the SRS configuration information indicates a first time-frequency resource used for sending the SRS, a sequence of the SRS and an antenna port used for sending the SRS.

Accordingly, the at least one terminal device receives SRS configuration information from the first device.

For example, the first device may configure configuration information of a Group Specific SRS (Group Specific SRS), that is, configuration information of an SRS used for determining a multicast channel state, where the SRS configuration information sent by the Specific first device for at least one terminal device in the first multicast Group may have the same content, that is, the first device configures the Group Specific SRS configuration information for the terminal device in the first multicast Group, and time-frequency resources for sending the SRS, SRS sequences, and antenna ports corresponding to sending the SRS, which are indicated in the Group Specific SRS configuration information, are all the same.

It should be understood that the multicast channel described in the present application may be used for transmitting multicast data from a transmitting side device to at least one receiving side device in the same multicast group. That is, a physical layer channel in which a transmitting side device transmits multicast specific data to at least one receiving side device may be referred to as a multicast channel. For example, the sending-side device scrambles multicast data with a multicast identifier and sends the multicast data on a multicast channel, and the terminal devices in a multicast group can receive the multicast data on the same time-frequency resource without mutual interference. In addition, when at least one terminal device in the multicast group is configured to transmit at least one SRS to the transmitting side device on the same time-frequency resource, the at least one SRS may be regarded as an integrated SRS on the multicast channel by the transmitting side device, and the transmitting side device determines the channel status of the multicast channel according to the integrated SRS.

Therefore, the SRS configuration information in the embodiment of the present application may specifically be configuration information corresponding to the group-specific SRS, and is used to instruct at least one terminal device in the multicast group to transmit the SRS configuration information. Specifically, the configuration information of the group-specific SRS may include a time domain configuration parameter, a frequency domain configuration parameter, a port configuration parameter, and an SRS sequence configuration parameter.

For example, the time domain configuration parameter and the frequency domain configuration parameter included in the SRS configuration information may be specifically used to indicate the first time/frequency resource, that is, the group-specific SRS sent by at least one terminal device in the first multicast group may be borne on the first time/frequency resource.

In addition, the SRS configuration information may further include an antenna port for transmitting the SRS, that is, at least one terminal device in the first multicast group may transmit the group-specific SRS through the antenna port indicated in the SRS configuration information.

Further, the SRS configuration information may further include a sequence for instructing at least one terminal device to transmit an SRS.

In an embodiment, the SRS configuration information may include an initial sequence, which is used to instruct at least one terminal device in the corresponding first multicast group to generate a sequence on a time-frequency resource location for transmitting a reference signal. Since the first device configures the same initial sequence for at least one terminal device in the first multicast group, in subsequent step 302, the sequences of SRSs transmitted by at least one terminal device in the first multicast group are the same.

It should be noted that, in this embodiment of the present application, before the first multicast group is grouped, a base station or another Network device may configure a corresponding Radio Network Temporary Identity (RNTI) for each terminal device of the first multicast group, where the RNTI is unique and is used to identify the terminal device in the communication system. For example, UE1 corresponds to RNTI1, and UE2 corresponds to RNTI2. After the first multicast group is formed, the base station or other network device may configure a corresponding group identifier for each terminal device of the first multicast group, so as to identify the first multicast group in the communication system. For example, UE1 corresponds to Group1, and UE2 also corresponds to Group1.

Illustratively, the Group identifier may specifically be a Group RNTI (Group RNTI), i.e. a distinction by which the RNTI is a different multicast Group. The Group RNTI may be specifically represented by X bits. This is not particularly limited in the embodiments of the present application.

In one embodiment, the first device may transmit one SRS configuration information to at least one terminal device.

Specifically, when the first device is a network device, the SRS configuration information may be carried in a Radio Resource Control (RRC) message, that is, the network device may add an indication field of the group-specific SRS configuration information in the RRC message. The network device may send the RRC message to at least one terminal device through a downlink multicast channel, where the RRC message is used to indicate SRS configuration information corresponding to the first multicast group.

In addition, when the first device is a terminal device, that is, the first device is a terminal device (abbreviated as a transmitting UE) of a transmitting end for transmitting multicast data in the first multicast group, the SRS configuration information may be carried in a PC5 RRC message. I.e. the transmitting UE may add an indication field of the group-specific SRS configuration information in the PC5 RRC message. The sending UE may send the PC5 RRC message to at least one terminal device through a sidelink multicast channel, where the message is used to indicate SRS configuration information corresponding to the first multicast group.

The above embodiment is applicable to the first multicast group, and the first device may send the group-specific SRS configuration information corresponding to the first multicast group to the at least one terminal device through one signaling, so as to effectively save communication signaling.

Alternatively, in another embodiment, the first device may transmit corresponding SRS configuration information to each of the at least one terminal device, respectively.

Specifically, when the first device is a network device, the network device may send a corresponding RRC message to each of the at least one terminal device. For example, the network device transmits RRC1 to UE1, where RRC1 includes SRS configuration information; the network device transmits RRC2 to UE2, the RRC2 including SRS configuration information. The SRS configuration information corresponding to each terminal device, such as UE1 and UE2, is the same.

In addition, when the first device is a terminal device, that is, when the first device is a terminal device of a transmitting end for transmitting multicast data in the first multicast group (referred to as a transmitting UE for short), the transmitting UE may transmit a corresponding PC5 RRC message to each of at least one terminal device. For example, the transmitting UE transmits PC5 RRC1 to the receiving UE1, the PC5 RRC1 including SRS configuration information; the transmitting UE transmits a PC5 RRC2 to the receiving UE2, the PC5 RRC2 including SRS configuration information. The SRS configuration information corresponding to the terminal device at each receiving side is the same.

Before the first multicast group is formed, the first device may send the group-specific SRS configuration information corresponding to the first multicast group to the N terminal devices through N signaling, where N may be a positive integer greater than 1.

302: each terminal device in the first multicast group transmits an SRS to the first device on the first time-frequency resource.

After at least one terminal device in the first multicast group successfully receives the group-specific SRS configuration information from the first device, the at least one terminal device may transmit the SRS to the first device on the same time-frequency resource (first time-frequency resource) according to the SRS configuration information. Accordingly, the first device receives at least one SRS from at least one terminal device.

Specifically, at least one terminal device may transmit an SRS to the first device on the first time-frequency resource indicated in the SRS configuration information.

Optionally, at least one terminal device has the same port for transmitting the SRS, that is, the number of antenna ports through which the at least one terminal device transmits the SRS to the first device and the corresponding antenna port number are the same.

In an embodiment, the terminal device may determine, according to a predetermined convention, the number of antenna ports for transmitting the SRS according to a certain threshold, or determine, according to a parameter of a certain antenna port, the number of antenna ports for transmitting the SRS.

Illustratively, according to the protocol convention, if the threshold corresponding to the number of the ports through which the terminal device sends the group-specific SRS is 2, the terminal device may send the SRS through the ports port 1 and port 2. Or, according to the protocol convention, the port index of the group-specific SRS sent by the terminal device is nrofSRS-Ports, and it can be determined according to the index nrofSRS-Ports that the port corresponding to the index is port 1, so that the terminal device can send the SRS through the port 1.

In another embodiment, the terminal device may report antenna port indication information to the first device in advance, where the antenna port indication information may be used to indicate the number of antenna ports of the corresponding terminal device, or the antenna port indication information may be used to indicate a set of antenna port indexes of the corresponding terminal device.

Optionally, the terminal device reports the antenna port indication information to the first device, and specifically before step 301, the method is used for the first device to determine an antenna port for sending the SRS according to at least one antenna port indication information reported by at least one terminal device, so as to determine the SRS configuration information.

In a possible manner, UE1 and UE2 may report respective antenna port indication information to the network device, where the antenna port indication information includes the number of antenna ports. Specifically, the number of antenna ports may be the maximum number of antenna ports that the UE1 or UE2 can support. Therefore, the network device can determine the number of antenna ports used for sending the SRS in the Group Specific SRS configuration information according to the number of antenna ports reported by the UE1 and the UE2.

For example, when the number of antenna ports reported by the UE1 to the network device is A1, and the number of antenna ports reported by the UE2 to the network device is A2, the number of antenna ports of the SRS in the Group Specific SRS configuration information determined by the network device may be a minimum value, that is, min (A1, A2), between the A1 and the A2. For example, A1> A2, the number of antenna ports of the SRS may be A2.

In another possible manner, the UE1 and the UE2 report respective antenna port indication information to the network device, where the antenna port indication information includes a maximum antenna port set that can be supported by the UE1 or the UE2. Therefore, the network device may determine the antenna port set of the SRS in the Group Specific SRS configuration information according to the antenna port sets reported by the UE1 and the UE2, respectively.

Exemplarily, the maximum antenna port set reported by the UE1 to the network device is S1, and the antenna port set S1 may include one or more antenna ports supported by the UE 1; the maximum antenna port set reported by the UE2 to the network device is S2, and the antenna port set S2 may include one or more antenna ports supported by the UE2. The set of antenna ports of the SRS in the Group Specific SRS configuration information determined by the network device is the intersection S of S1 and S2. Wherein, the antenna port set S may include one or more antenna ports supported by both UE1 and UE2.

303: the first device determines multicast channel state information from the at least one SRS.

The time-frequency resources carrying the at least one SRS are the same, and the sequences of the at least one SRS are the same.

It should be noted that, in the embodiment of the present application, if it is assumed that the communication transmission is without a delay, the first device may receive at least one SRS from at least one terminal device on the first time/frequency resource. However, in practical applications, a certain time delay exists in communication transmission, and therefore, a certain deviation exists between a time domain resource of an SRS transmitted by at least one terminal device and a time domain resource of an SRS received by a first device.

Specifically, the first device may perform channel measurement and estimation based on at least one SRS according to channel reciprocity, to obtain multicast channel state information between the first device and the terminal device. In one possible scenario, the uplink and downlink signals in a communication system may be transmitted in different time domains of the same frequency domain resource, so that in a relatively short time (coherence time of channel propagation), the channel fading experienced by the uplink and downlink transmission signals may be considered to be the same, i.e., channel reciprocity.

The multicast channel state information in this embodiment refers to channel state information of a multicast channel between a sending-side device (which may be a network device or a terminal device) and multiple receiving-side devices, where the multicast channel is used for the sending-side device to transmit multicast data to the multiple receiving-side devices. The multicast channel state information is state information of a specific multicast channel, and is distinguished from existing channel state information between one transmitting device and one receiving device.

Specifically, the algorithm for determining the multicast channel state information according to the at least one SRS may be implemented by referring to related technologies, which is not described in detail herein.

In the above embodiments of the present application, the first device may perform channel measurement and estimation comprehensively based on SRSs sent by multiple terminal devices, so that the SRS has higher signal power, which is beneficial for the first device to measure the precision of the multicast channel and improve the communication quality.

304: and the first equipment determines physical layer multicast beam forming or a pre-coding matrix according to the multicast channel state information.

In the above steps 303 and 304, the steps performed by the first device may be performed in the same step, for example, the first device may determine the physical layer multicast beamforming or the precoding matrix according to the at least one SRS. Or, the first device may also execute successively, for example, the first device first executes step 303 to obtain the multicast channel state information, and then executes step 304 to obtain the physical layer multicast beamforming or precoding matrix. This is not limited by the present application.

The beamforming technology is a signal preprocessing technology based on an antenna array, which may also be referred to as a beamforming or spatial filtering technology, and is a signal processing technology that uses a sensor array to directionally transmit and receive signals.

Specifically, in the embodiment of the present application, the beamforming technology is applied to a data transmitting end, that is, the transmitting end may adjust parameters of a basic unit of a phase array of a transmitting antenna, so that transmission signals at certain angles obtain constructive interference, and transmission signals at other angles obtain destructive interference, thereby generating a transmission beam with directivity, and transmitting the transmission beam to a specific user to obtain an obvious array gain.

In an embodiment of the present application, a beamforming set may be defined, and the beamforming set may include a plurality of beamforming or spatial filtering coefficient matrices or vectors. Specifically, different beams in the beamforming set and the coefficient matrix or vector corresponding to the beam may be distinguished by the index value.

In addition, the precoding technique may pre-process a signal to be transmitted through a baseband to generate a precoding matrix. Specifically, the sending end may allocate limited transmission power to a data stream that can be effectively transmitted according to the number of parallel transmission streams that can be supported by a channel, so that a sending signal can be sent to a specific user in a more directional manner, thereby avoiding waste of transmission power.

Specifically, the algorithm for determining the multicast beamforming or the precoding matrix by the first device according to the multicast channel state information may be implemented by referring to related technologies, which is not specifically limited in this application.

305: the first device sends multicast data to at least one terminal device according to physical layer multicast beamforming or a precoding matrix.

In a possible implementation manner, the multicast data may be carried in a second time-frequency resource, where the second time-frequency resource is the same as the frequency-domain resource of the first time-frequency resource, or the frequency-domain resource of the second time-frequency resource is a subset of the frequency-domain resource of the first time-frequency resource.

That is, the frequency domain resources on which the multicast data is transmitted may be located the same as the frequency domain resources on which the SRS is transmitted. Alternatively, the frequency domain resources on which the multicast data is transmitted may be a subset of the frequency domain resources on which the SRS is transmitted.

Illustratively, the first device is a network device shown in fig. 1, and the network device transmits one multicast data to UE1 and UE2 by using physical layer multicast beamforming, or precoding matrix. The frequency domain resource for transmitting the multicast data is located in a downlink Bandwidth Part (BWP) of the UE1, and is also located in the downlink BWP of the UE2.

In the above embodiment of the present application, the first device may perform multicast channel measurement on a multicast channel bandwidth by sending an SRS, and send multicast data may occupy a part of or all of the measured bandwidth of the multicast channel, so as to improve effectiveness of mutual utilization of multicast channels, improve efficiency of multicast data transmission, and improve data transmission performance of a communication system.

It should be noted that, if one transmitting-side device corresponds to two multicast groups (a receiving-side device set), for example, the first device corresponds to a first multicast group and a second multicast group. Illustratively, the first multicast group includes UE1 and UE2, and the second multicast group includes UE3 and UE4. The first device may transmit the first multicast data to UE1 and UE2 within the first multicast group using one physical layer multicast beam or one precoding matrix. The first device may transmit the second multicast data to UE3 and UE4 within the second multicast group with another physical layer multicast beam or another precoding.

In one embodiment, the implementation method of the present application may further include: the first device may send first control information to at least one terminal device, where the first control information may be used to indicate a time-frequency resource location for transmitting multicast data.

Optionally, the sending, by the first device, the first control information to the at least one terminal device may occur before step 305 in the foregoing embodiment, and is used to instruct the at least one terminal device about the time-frequency resource for the first device to send the multicast data. So that after step 305 at least one terminal device may receive multicast data from the first device according to the time-frequency resource location indicated by the at least one terminal device.

In a possible manner, the first device may send the first control information to the at least one terminal device according to physical layer multicast beamforming or a precoding matrix. That is, the first device sends the first control information to at least one terminal device through the physical layer multicast beamforming or precoding matrix determined in step 304.

In the possible embodiment, after determining the physical layer multicast beamforming or precoding matrix, the first device may multicast and send the first control information to the at least one terminal device according to the physical layer multicast beamforming or precoding matrix, where the first control information may specifically be an SCI or a DCI, and is used to notify the at least one terminal device of a time-frequency resource for transmitting multicast data, so that beam coverage of the first control information and effectiveness of communication may be improved. In addition, the first device does not need to send the first control information to at least one terminal device independently, signaling overhead can be effectively saved, communication resources are saved, and the efficiency of the communication system is improved.

Alternatively, in a possible manner, the first device may also send the first control information to at least one terminal device respectively, for instructing the terminal device how to receive or decode the multicast data. Illustratively, the first device may send the first control information to UE1, and in addition, the second device also sends the first control information to UE2. Wherein, UE1 and UE2 correspond to the same third control information.

Next, the present application will separately describe embodiments of the present application in detail, with respect to the case where the first device is a network device or the first device is a terminal device.

(1) In the case where the first device is a network device:

the first Control Information may specifically be Downlink Control Information (DCI).

In one embodiment, the network device may transmit DCI to the at least one terminal device according to physical layer multicast beamforming or a precoding matrix. Illustratively, as shown in fig. 1, the network device transmits DCI to UE1 and UE2 through one physical layer multicast beam.

In a possible case, the DCI for the multicast transmission may be carried in a Physical Downlink Control Channel (PDCCH).

Further, the DCI for the multicast transmission may include a Group identification, group ID, of the first multicast Group.

Specifically, the network device may indicate the group identifier in the DCI in a display manner, for example, the network device may add a group identifier indication field in the DCI, for example, indicate the group identifier by using Y bits in the DCI, where Y may be a natural number. Or, the network device may also indicate the Group identifier in an implicit manner, that is, the DCI for multicast transmission may be scrambled by using the Group RNTI. Therefore, only the receiving side device corresponding to the Group RNTI can successfully decode the DCI to acquire the data therein.

In addition, the DCI for multicast transmission may further include an indication field of a Modulation and Coding Scheme (MCS) to indicate a MCS for multicast transmission.

In another embodiment, the network device may also send DCI to at least one terminal device respectively, for instructing the terminal device how to receive or decode the multicast data. Then, step 305 is executed, that is, the network device may send the multicast data to at least one terminal device according to the Physical layer multicast beamforming or the precoding matrix, where the multicast data may be carried in a Physical Downlink Shared CHannel (PDSCH).

Exemplarily, as shown in fig. 1, the network device sends DCI to UE1, instructing UE1 how to receive or decode PDSCH; in addition, the network equipment sends DCI to UE2, instructing UE2 how to receive or decode PDSCH.

Further, the DCI respectively sent by the network device to at least one terminal device may also include a Group identifier Group ID of the first multicast Group. Specifically, the network device may indicate the group identifier in the DCI in the foregoing, displayed or stealth manner, and details of the specific indication manner are not repeated herein.

In addition, the DCI respectively transmitted by the network device to the at least one terminal device may further include an MCS.

Further, in step 305 in the embodiment of the present application, the network device may send downlink multicast data to at least one terminal device, such as UE1 and UE2, according to the determined physical layer multicast beamforming or precoding matrix.

The frequency domain resource for the network device to transmit the downlink multicast data may be located in the downlink BWP of UE1, and also located in the downlink BWP of UE2.

In a possible manner, the frequency domain resource location of the downlink BWP where the network device transmits the downlink multicast data is the same as the frequency domain resource location of the uplink BWP where the at least one terminal device transmits the SRS. Or, the frequency domain resource location of the downlink BWP where the network device transmits the downlink multicast data is a subset of the frequency domain resource of the uplink BWP where at least one terminal device transmits the SRS.

(2) Under the condition that the first device is a terminal device:

the first device is a sending side device, which may be used to send multicast data on a sidelink in the first multicast, and is referred to as a sending UE for short. Illustratively, it may be as the UE3 shown in fig. 1.

At this time, the first Control Information may specifically be Sidelink Control Information (SCI).

In one embodiment, the transmitting UE may transmit the SCI to the at least one terminal device according to a physical layer multicast beamforming or precoding matrix. For example, as shown in fig. 1, the transmitting UE, that is, UE3, may send an SCI to UE1 and UE2 through a physical layer multicast beam, so that signaling transmission may be energy-saving.

Optionally, as shown in fig. 4, the SCI of the multicast transmission may be carried in a Physical Sidelink Control Channel (PSCCH).

In another embodiment, the sending UE may also send SCI to at least one terminal device respectively for instructing the terminal device how to receive or decode the multicast data.

For example, as shown in fig. 4, the sending UE may send multicast data to at least one terminal device according to Physical layer multicast beamforming or a precoding matrix, where the multicast data may be carried on a Physical Sidelink Shared CHannel (psch).

The SCI may further include a Group identifier Group ID of the first multicast Group, and an MCS indication. For the specific indication manner, reference may be made to the related description in the foregoing embodiments, and details are not repeated here.

Through the foregoing embodiment, the first device may configure configuration information of the group-specific SRS for the plurality of terminal devices, at least one terminal device in the multicast group may send the SRS with the same sequence to the first device on the same time-frequency resource, and the at least one SRS on the same time-frequency resource may be regarded as an integrated SRS for the sending-side device, so as to implement effective measurement of the sending-side device on the multicast channel, and obtain channel state information of the multicast channel. Therefore, the first device can determine the physical layer multicast beamforming or the precoding matrix according to the channel state information of the multicast channel, and is used for sending multicast data to at least one terminal device in the first multicast group, so that the utilization rate of the physical layer multicast on frequency spectrum resources is improved, and the waste of transmission resources in the multicast service is reduced as much as possible.

In addition, the embodiments of the present application further provide a data sending and receiving method, and specifically, the multicast channel state information may be determined based on feedback information of a channel state of a terminal device. The method may be applied between a first device and at least one terminal device. The first device may be a network device or a terminal device. Specifically, as shown in fig. 5, the method may include:

501: the first device sends at least one piece of first configuration information to at least one terminal device in the first multicast group, wherein the first configuration information is used for indicating time-frequency resources of CSI reports.

Accordingly, at least one terminal device receives first configuration information from a first device.

In an embodiment, the first configuration information may further include a time-frequency resource indicating that the first device transmits the CSI-RS. Or before the first device sends the first configuration information to the at least one terminal device, sending second configuration information to the at least one terminal device, where the second configuration information is used to indicate a time-frequency resource for the first device to send CSI-RS.

It should be noted that the first device configuration may be a Group Specific CSI-RS (Group Specific CSI-RS), that is, a multicast channel-Specific CSI-RS. Specifically, the reference signal is used to indicate channel state information of a multicast channel between a sending-side device (which may be a network device or a terminal device) and at least one receiving-side device. The multicast channel may be used for transmitting multicast data from a transmitting device to at least one receiving device.

Therefore, the second configuration information, that is, the CSI-RS configuration information in the embodiment of the present application may specifically be configuration information corresponding to the group-specific CSI-RS, and is used to instruct the first device to send time-frequency resource location information of the group-specific CSI-RS to at least one terminal device group. Specifically, the configuration information of the group-specific CSI-RS may include a time domain configuration parameter and a frequency domain configuration parameter.

It should be noted that, in this embodiment, before the first multicast group is formed, the base station or another network device may configure a corresponding RNTI for each terminal device of the first multicast group, so as to uniquely identify the terminal device. For example, UE1 corresponds to RNTI1, and UE2 corresponds to RNTI2. After the first multicast group is formed, the base station or other network device may configure a corresponding group identifier for each terminal device of the first multicast group, so as to identify the first multicast group in the communication system. For example, UE1 corresponds to Group1, and UE2 also corresponds to Group1. Illustratively, as previously described, the Group identity may also be a Group RNTI (Group RNTI).

In one embodiment, the first device may send one of the first configuration information or the second configuration information to the at least one terminal device.

Specifically, when the first device is a network device, the first configuration information may be carried in an RRC message, that is, the network device may add an indication field of the group-specific first configuration information in the RRC message. The network device may send the RRC message to at least one terminal device through a downlink multicast channel, where the RRC message is used to instruct at least one terminal device in the first multicast group to send time domain resource location information of a CSI report.

In addition, when the first device is a terminal device, that is, the first device is a terminal device (abbreviated as a sending UE) of a sending end for sending multicast data in the first multicast group, the first configuration information may be carried in the PC5 RRC message. I.e. the sending UE may add the indication field of the first configuration information in the PC5 RRC message. The sending UE may send the PC5 RRC message to at least one terminal device through a sidelink multicast channel, where the PC5 RRC message is used to indicate first configuration information corresponding to the first multicast group.

The above embodiment is suitable for the first device to send the time domain resource location information of the CSI report corresponding to the first multicast group to the at least one terminal device through a signaling after the first multicast group is formed, so that the communication signaling can be effectively saved.

Similarly, the specific implementation manner of the first device sending the second configuration information to the at least one terminal device is similar to that of the first configuration information, and reference may be specifically made to the above related description, which is not described herein again.

In another embodiment, the first device may send corresponding first configuration information or second configuration information to each of the at least one terminal device, respectively.

Specifically, when the first device is a network device, the network device may send a corresponding RRC message to each of the at least one terminal device. For example, the network device transmits RRC1 to UE1, where RRC1 includes SRS configuration information; the network device sends RRC2 to UE2, where RRC2 includes the first configuration information, or the second configuration information. And the first configuration information/the second configuration information corresponding to each terminal device are the same.

In addition, when the first device is a terminal device, that is, the first device is a terminal device of a transmitting end for transmitting multicast data in the first multicast group (referred to as a transmitting UE for short), the transmitting UE may transmit a corresponding PC5 RRC message to each of at least one terminal device. For example, the transmitting UE transmits the PC5 RRC1 to the receiving UE1, the PC5 RRC1 including the first configuration information, or the second configuration information. In addition, the transmitting UE transmits the PC5 RRC2 to the receiving UE2, the PC5 RRC2 including, or being the second configuration information. The first configuration information/the second configuration information corresponding to each receiving side terminal device, such as UE1 and UE2, are the same.

Before the first multicast group is formed, the first device may send the group-specific SRS configuration information corresponding to the first multicast group to the N terminal devices through N signaling items, where N may be a positive integer greater than 1.

And the first equipment respectively sends corresponding first configuration information to each terminal equipment in the at least one terminal equipment, and the first configuration information corresponding to each terminal equipment is the same.

In one embodiment, the first configuration information may include an indication of a frequency domain resource candidate set for the terminal device to send the CSI report, and time domain constraint information for the terminal device to send the CSI report. Wherein the frequency domain resource candidate set for transmitting the CSI report may be located on an intersection of the transmission BWPs of the at least one receiving-side terminal device within the first multicast.

Specifically, the first configuration information may include a constraint parameter of the frequency domain resource, that is, the first configuration information is used to indicate that each of the at least one terminal device may send the CSI report to the first device within a bandwidth of the frequency domain resource indicated by the first configuration information.

The first configuration information may indicate, in a hidden manner, a time domain constraint for the terminal device to send the CSI report. For example, the terminal device may send the CSI report to the first device within the duration Z according to the protocol convention. That is, the maximum value of the time domain resources for the terminal device to transmit the CSI report may be less than or equal to the threshold Z.

In another embodiment, the first configuration information may include a first time limit, and the first configuration information is used to indicate that at least one terminal device may send the CSI report to the first device within the first time limit.

Through the above embodiment, the first device can limit different terminal devices in the multicast group to synchronously report the CSI reports within the preset time constraint, so that the first device can determine the multicast channel state information more accurately according to the channel state information reflected by the CSI reports, thereby effectively improving the utilization rate of the multicast channel.

502: the first device transmits the CSI-RS to at least one terminal device.

Specifically, the first device may send the CSI-RS to the at least one terminal device according to the time-frequency resource location indicated in the second configuration information. Accordingly, at least one terminal device receives the CSI-RS from the first device.

503: each terminal device in the first multicast group sends a CSI report to the first device.

The terminal equipment receives the CSI-RS from the first equipment, obtains the CSI through the measurement of the CSI-RS, and reports the CSI to the first equipment through a CSI report. In addition, the at least one terminal device measures according to the same multicast CSI-RS and feeds back a CSI report. Accordingly, the first device receives at least one CSI report from the at least one terminal device.

At least one terminal device of the receiving end in the first multicast group may report the CSI report to the first device synchronously on the same time-frequency resource according to the indication of the first configuration information in step 501.

In an embodiment, the manner in which the terminal device reports the CSI report to the first device may be periodic, that is, at least one terminal device sends the CSI report to the first device every certain time.

In this embodiment, the first configuration information may be used to indicate a period and a starting time point of time-frequency resources for CSI reporting. So that at least one terminal device may send CSI reports to the first device at a certain period duration from the start time point according to the indication of the first configuration information.

Illustratively, the period of the time-frequency resource of the CSI report in the first configuration information is T, and the starting time point for sending the CSI report is T1. At least one terminal device may start at time T1 at the same time, and report the CSI report to the first device once every T duration.

In another embodiment, the mode of reporting the CSI report to the first device by the terminal device may be semi-static, that is, on the basis of the period and the starting time point when the first device configures a time-frequency resource for sending the CSI report for at least one terminal device, the terminal device may trigger reporting the CSI report to the first device according to a real-time instruction of the first device.

Specifically, the first device may send a Control Unit (CE) of a Media Access Control (MAC) layer to the at least one terminal device, where the Control Unit is configured to instruct the at least one terminal device to send a CSI report to the first device.

Illustratively, when the first device is a network device, the network device may configure the same CSI transmission period and the same transmission time start point to terminal devices in the group, e.g., UE1 and UE2, through an RRC message. In addition, the network device may also report the CSI report to the first device semi-statically through a terminal device in the MAC CE active set.

In addition, the mode of reporting the CSI report to the first device by the terminal device may also be aperiodic.

At this time, the first device may further transmit second control information to the at least one terminal device for indicating that the at least one terminal device may transmit the CSI report to the first device.

The second control information may specifically be DCI or SCI. That is, when the first device is a network device, the network device may be configured to instruct at least one terminal device to report the CSI report by sending the DCI; when the first device is a terminal device, the network device may be configured to instruct at least one terminal device to report the CSI report by sending the DCI.

For example, when the first device is a network device, the network device may trigger at least one terminal device in the multicast group to report the CSI report to the first device on the same time-frequency resource through one multicast DCI.

In one embodiment, the CSI report may include Channel Quality Information (CQI), rank Indication (RI), precoding Matrix Indication (PMI), and Layer Indication (LI).

504: the first device determines a physical layer packet broadcast beamforming or precoding matrix according to the at least one CSI report.

The CSI reports reported by the multiple terminal devices may be used to determine channel state information of a multicast channel between the transmitting-side device and the multiple receiving-side devices.

Specifically, the first device may obtain channel state information of the multicast channel according to a received CSI report reported by at least one terminal device, and determine a physical layer multicast beamforming or a precoding matrix according to the obtained channel state information of the multicast channel. The specific algorithm may be implemented by referring to the related art, which is not specifically limited in this application.

505: the first equipment sends multicast data to at least one terminal equipment according to the physical layer multicast beamforming or the pre-coding matrix.

In an implementation manner, in the foregoing step 502, the CSI-RS sent by the first device to the at least one terminal device may be carried in a first frequency domain resource, and the multicast data may be carried in a second frequency domain resource, where the second frequency domain resource is the same as the first frequency domain resource, or the second frequency domain resource is a subset of the first frequency domain resource.

That is, the frequency domain resource transmitting the multicast data may be located at the same position as the frequency domain resource transmitting the CSI-RS. Alternatively, the frequency domain resources on which the multicast data is transmitted are a subset of the frequency domain resources on which the CSI-RS is transmitted.

Illustratively, when the first device is a terminal device UE3 shown in fig. 1, the terminal device UE3 may send one multicast data to UE1 and UE2 by using physical layer multicast beamforming, or a precoding matrix. The frequency domain resource for transmitting the multicast data may be located in the BWP of UE1 and also in the BWP of UE2.

In the foregoing embodiment of the present application, the first device may perform multicast channel measurement on a multicast channel bandwidth by sending a CSI-RS and receiving at least one CSI report, and send multicast data may occupy a part of or all of the measured bandwidth of the multicast channel, so as to obtain a frequency domain diversity gain, thereby improving the effectiveness of the multicast channel inter-diversity utilization, improving the efficiency of multicast data transmission, and thus improving the data transmission performance of the communication system.

In one embodiment, the implementation method of the present application may further include: the first device may send third control information to the at least one terminal device, where the third control information may be used to indicate a time-frequency resource location for transmitting the multicast data.

The sending, by the first device, the third control information to the at least one terminal device may occur before step 505 in the foregoing embodiment, and is used to indicate, to the at least one terminal device, time-frequency resources for the first device to send multicast data. So that after step 505, at least one terminal device may receive multicast data from the first device according to the time-frequency resource location indicated by the at least one terminal device.

In one possible approach, the first device may send the third control information to the at least one terminal device according to physical layer multicast beamforming or a precoding matrix. That is, the first device sends the third control information to at least one terminal device through the physical layer multicast beamforming or the precoding matrix determined in step 504.

In the possible embodiment, the third control information may specifically be SCI or DCI, and is used to notify at least one terminal device of a time-frequency resource for transmitting multicast data, so that the beam coverage and the effectiveness of communication of the third control information may be improved. In addition, the first device does not need to multicast and send the third control information to at least one terminal device independently, signaling overhead can be effectively saved, communication resources are saved, and the efficiency of the communication system is improved.

Alternatively, in a possible manner, the first device may also send third control information to at least one terminal device, respectively, for instructing the terminal devices how to receive or decode the multicast data. For example, the first device may send the third control information to UE1, and in addition, the second device also sends the third control information to UE2. The UE1 and the UE2 correspond to the same third control information.

Similar to the foregoing embodiment of determining the multicast channel state information based on channel reciprocity, in the case that the first device is a network device, the third control information may specifically be DCI. In a case where the first device is a terminal device, that is, the first device is a sending-side device in the first multicast, which may be used to send multicast data on a sidelink, in this case, the third control information may specifically be the SCI.

Next, this will be described separately.

(1) In the case where the first device is a network device:

The DCI for multicast transmission may be carried on the PDCCH. Then, step 505 may be performed, that is, the network device may transmit the multicast data to at least one terminal device according to the physical layer multicast beamforming or the precoding matrix. Referring to fig. 6, the multicast data may be carried on the PDSCH.

In another embodiment, the network device may also send DCI to at least one terminal device respectively, for instructing the terminal device how to receive or decode the multicast data.

Exemplarily, as shown in fig. 1, the network device sends DCI to UE1, instructing UE1 how to receive or decode PDSCH; in addition, the network device sends DCI to UE2, instructing UE2 how to receive or decode PDSCH.

Further, the DCI for the multicast transmission may include a Group identification Group ID for the first multicast Group. The DCI respectively transmitted by the network device to the at least one terminal device may also include a Group identifier Group ID of the first multicast Group. The aforementioned group identifier indication manner may include a displayed indication or an implicit indication, which is not described herein again.

In addition, the DCI for multicast transmission may also include an MCS indication. The DCI respectively transmitted by the network device to the at least one terminal device may further include an MCS.

Further, in step 505 in the embodiment of the present application, the network device may send downlink multicast data to at least one terminal device, such as UE1 and UE2, according to the determined physical layer multicast beamforming or precoding matrix.

(2) Under the condition that the first device is a terminal device:

the first device is a sending-side device in the first multicast, which may be used to send multicast data on a sidelink, and is referred to as a sending UE for short. Illustratively, it may be as the UE3 shown in fig. 1.

At this time, in one embodiment, the transmitting UE may transmit the SCI to the at least one terminal device according to physical layer multicast beamforming or a precoding matrix. Illustratively, as shown in fig. 1, the transmitting UE, i.e., UE3, may transmit an SCI to UE1 and UE2 through a physical layer multicast beam, so that signaling transmission may be energy-efficient.

As shown in fig. 7, SCI of the multicast transmission may be carried on PSCCH.

Then, as shown in fig. 7, the sending UE may send multicast data to at least one terminal device according to physical layer multicast beamforming or a precoding matrix, where the multicast data may be carried on the PSSCH.

Through the above embodiment, the first device may configure configuration information of a specific CSI report for the multicast channel, so that channel state information of the multicast channel between one sending-side device and multiple receiving-side devices may be obtained according to CSI reports fed back by different terminal devices, and a physical layer multicast beamforming property or a precoding matrix suitable for multicast transmission is determined according to the channel state information of the multicast channel, so as to send multicast data, improve the utilization rate of spectrum resources for physical layer multicast transmission, and reduce transmission resource waste in multicast services as much as possible. .

Based on the above embodiment of determining channel state information based on channel reciprocity provided by the present application, the present application provides a communication apparatus for implementing the steps performed by the first device in the above embodiment. As shown in fig. 8, the communication apparatus 800 may include: a sending module 801, a receiving module 802 and a processing module 803.

The transmitting module 801 may be configured to transmit, to at least one terminal device in the first multicast group, SRS configuration information, where the SRS configuration information indicates a first time-frequency resource used for transmitting an SRS, a sequence of the SRS, and an antenna port used for transmitting the SRS.

The receiving module 802 may be configured to receive at least one SRS from at least one terminal device on a first time-frequency resource, and determine multicast channel status information based on the at least one SRS, where the time-frequency resources carrying the at least one SRS are the same, and sequences of the at least one SRS are the same.

The processing module 803 may be configured to determine a physical layer multicast beamforming or precoding matrix according to the multicast channel state information.

The sending module 801 may further be configured to send multicast data to at least one terminal device according to physical layer multicast beamforming or a precoding matrix.

In an embodiment, the receiving module 802 is further configured to receive at least one antenna port indication information from at least one terminal device, where the antenna port indication information is used to indicate the number of antenna ports of the corresponding terminal device or a set of antenna port indexes of the corresponding terminal device.

The processing module 803 is further configured to determine an antenna port for transmitting the SRS according to the at least one antenna port indication information.

In an embodiment, the sending module 801 is further configured to send first control information to at least one terminal device according to physical layer multicast beamforming or a precoding matrix, where the first control information is used to indicate a time-frequency resource of multicast data, and the first control information further includes a group identifier of a first multicast group.

In one embodiment, the communication apparatus 800 may be a network device, or the communication apparatus 800 may also be a terminal device in the first multicast group.

In an embodiment, the sending module 801 may be further configured to send one SRS configuration information to at least one terminal device, or the sending module 801 may be further configured to send corresponding SRS configuration information to each terminal device of the at least one terminal device, where the SRS configuration information corresponding to each terminal device is the same.

The present application further provides a communication apparatus, configured to implement the steps executed by the terminal device in the foregoing embodiment. As shown in fig. 9, the communication apparatus 900 may include a receiving module 901 and a transmitting module 902.

The receiving module 901 may be configured to receive, from the first device, SRS configuration information indicating a first time-frequency resource used for transmitting an SRS, a sequence of the SRS, and an antenna port used for transmitting the SRS.

The sending module 902 may be configured to send, to the first device, an SRS on the first time-frequency resource, where the SRS is used by the first device to determine multicast channel state information of the first multicast group according to at least one SRS.

The receiving module 901 may also be configured to receive multicast data from the first device, where the multicast data is sent by the first device according to physical layer multicast beamforming or a precoding matrix, and the physical layer multicast beamforming or the precoding matrix is determined by the first device according to multicast channel state information.

In an embodiment, the sending module 902 may be further configured to send, to the first device, antenna port indication information, where the antenna port indication information is used to indicate the number of antenna ports of the communication apparatus 900, or a set of antenna port indexes of the communication apparatus 900; the antenna port indication information is used for the first device to determine an antenna port for transmitting the SRS.

In an implementation manner, the receiving module 901 may further be configured to receive first control information from the first device, where the first control information is used to indicate a time-frequency resource of multicast data, where the first control information further includes a group identifier of a first multicast group, and the first control information is sent by the first device according to physical layer multicast beamforming or a precoding matrix.

In addition, based on the above embodiment of determining channel state information based on CSI feedback provided by the present application, the present application also provides a communication apparatus for implementing the steps performed by the first device in the above embodiment. As shown in fig. 8, the communication apparatus 800 may include: a sending module 801, a receiving module 802 and a processing module 803.

The sending module 801 may be configured to send at least one first configuration information to at least one terminal device in the first multicast group, where the first configuration information is used to indicate time-frequency resources of a CSI report; the transmitting module 801 may also be configured to transmit a channel state information reference signal, CSI-RS, to at least one terminal device.

The receiving module 802 may be configured to receive at least one CSI report from at least one terminal device.

The processing module 803 may be configured to determine a physical layer packet-cast beamforming or precoding matrix from the at least one CSI report.

The sending module 801 may be further configured to send multicast data to at least one terminal device according to physical layer multicast beamforming or a precoding matrix.

In an embodiment, the sending module 801 may be further configured to send a control element MAC CE of a medium access control layer to the at least one terminal device, for instructing the at least one terminal device to send a CSI report to the communication apparatus.

In an embodiment, the sending module 801 may be further configured to send second control information to the at least one terminal device, for instructing the at least one terminal device to send the CSI report to the communication apparatus.

In an implementation manner, the sending module 801 may be further configured to send third control information to the at least one terminal device according to physical layer multicast beamforming or a precoding matrix, where the third control information is used to indicate a time-frequency resource of multicast data, and the third control information further includes a group identifier of the first multicast group.

In an embodiment, the sending module 801 may be configured to send one piece of first configuration information to at least one terminal device, or the sending module 801 may be configured to send corresponding first configuration information to each terminal device of the at least one terminal device, where the corresponding first configuration information of each terminal device is the same.

The present application further provides a communication apparatus, configured to implement the steps executed by the terminal device in the foregoing embodiment. As shown in fig. 8, the communication apparatus 800 may include: a sending module 801, a receiving module 802 and a processing module 803.

Wherein the receiving module 802 may be configured to receive first configuration information from a first device, where the first configuration information is used to indicate time-frequency resources of a channel state information, CSI, report; the receiving module 802 may also be configured to receive a channel state information reference signal, CSI-RS, from the first device.

The processing module 803 may be configured to send CSI reports to the first device according to the CSI-RS, the CSI reports being used by the first device to determine multicast channel state information for the first multicast group according to the at least one CSI report.

The receiving module 802 may further be configured to receive multicast data from the first device, where the multicast data is sent by the first device according to physical layer multicast beamforming or a precoding matrix, and the physical layer multicast beamforming or the precoding matrix is determined by the first device according to the multicast channel state information.

In one embodiment, the first configuration information includes a first time limit, and the first configuration information is used for instructing the communication apparatus to transmit the CSI report within the first time limit.

In one embodiment, the receiving module 802 is further configured to receive a control unit MAC CE from a media access control layer of the first device; the transmitting module 801 is further configured to transmit the CSI report to the first device according to the MAC CE.

In one embodiment, the receiving module 802 is further configured to receive second control information from the first device; the sending module 801 is further configured to send the CSI report to the first device by using the second control information.

In an embodiment, the receiving module 802 is further configured to receive third control information from the first device, where the third control information is used to indicate a time-frequency resource of multicast data, where the third control information further includes a group identifier of the first multicast group, and the third control information is sent by the first device according to physical layer multicast beamforming or a precoding matrix.

It should be noted that, for the specific implementation process and embodiment in the communication apparatus, reference may be made to the steps executed by the first device or the terminal device in the foregoing method embodiment and related descriptions, and the technical problem to be solved and the technical effect brought by the foregoing embodiment may also be referred to the contents described in the foregoing embodiment, which are not described in detail herein.

In the present embodiment, the communication apparatus may be presented in a form of dividing each functional module in an integrated manner. A "module" herein may refer to a specific circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other devices that may provide the functionality described above. In a simple embodiment, the communication means may take the form as shown in figure 2 of the foregoing description, as will be appreciated by those skilled in the art.

Illustratively, the functions/implementation procedures of the processing module 803 in fig. 8 may be implemented by the processor 201 in fig. 2 calling computer program instructions stored in the memory 203. For example, the functions/implementation procedures of the sending module 801 and the receiving module 802 in fig. 8 can be implemented by the communication interface 204 in fig. 2. The functions/implementation procedures of the receiving module 901 and the sending module 902 in fig. 9 can be implemented by the communication interface 204 in fig. 2.

In some embodiments, the processor 201 in fig. 2 may implement the above-described various possible implementation methods of the present application by calling a computer stored in the memory 203 to execute instructions, so that the apparatus 200 may perform operations performed by the first device or the terminal device in the above-described various method embodiments.

The communication group apparatus in the above-mentioned various apparatus embodiments may completely correspond to the first device or the terminal device in the method embodiments, and the corresponding steps are executed by a corresponding module or unit, for example, when the apparatus is implemented in the form of a chip, the communication unit may be an interface circuit of the chip for receiving signals from other chips or apparatuses. The above communication unit for transmission or reception is an interface circuit of the apparatus for transmitting a signal to other apparatuses, and for example, when the apparatus is implemented in the form of a chip, the communication unit may be an interface circuit for transmitting a signal to other chips or apparatuses.

In an exemplary embodiment, a computer-readable storage medium, or computer program product, is also provided that includes instructions executable by the processor 201 of the communication device 200 to perform the methods of the above-described embodiments. Therefore, the technical effects obtained by the method can be obtained by referring to the method embodiments, which are not described herein again.

The present application also provides a computer program product comprising instructions that, when executed, enable the computer to perform operations corresponding to the operations performed by the first device or the terminal device of the above method, respectively.

An embodiment of the present application further provides a system chip, where the system chip includes: a processing unit, which may be, for example, a processor, and a communication unit, which may be, for example, an input/output interface, a pin or a circuit, etc. The processing unit may execute the computer instructions to enable the communication device to which the chip is applied to perform the operations performed by the first device or the terminal device in the method provided by the embodiment of the present application.

Optionally, any one of the communication devices provided in the embodiments of the present application may include the system chip.

Optionally, the computer instructions are stored in a storage unit.

An embodiment of the present application further provides a communication system, where the communication system may include: any one of the first device and the at least one terminal device of the above embodiments.

In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware, or any combination thereof. When implemented using a software program, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the present application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.

Finally, it should be noted that: the above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be covered within 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 data, the method comprising:

the method comprises the steps that first equipment sends channel Sounding Reference Signal (SRS) configuration information to at least one terminal equipment in a first multicast group, wherein the SRS configuration information indicates a first time-frequency resource used for sending an SRS, a sequence of the SRS and an antenna port used for sending the SRS;

the first device receives at least one SRS from the at least one terminal device on the first time-frequency resource, and determines multicast channel state information based on the at least one SRS, wherein the time-frequency resources for carrying the at least one SRS are the same, and the sequences of the at least one SRS are the same;

the first equipment determines physical layer multicast beam forming or a pre-coding matrix according to the multicast channel state information;

and the first equipment sends multicast data to the at least one terminal equipment according to the physical layer multicast beamforming or the precoding matrix.

2. The method of claim 1, wherein the at least one SRS is transmitted over a same antenna port.

3. The method according to claim 1 or 2, characterized in that the method further comprises:

the first device receives at least one antenna port indication message from the at least one terminal device, where the antenna port indication message is used to indicate the number of antenna ports of a corresponding terminal device, or a set of antenna port indexes of the corresponding terminal device;

the first device determines the antenna port for transmitting the SRS according to the at least one antenna port indication information.

4. The method according to any one of claims 1-3, further comprising:

and the first device sends first control information to the at least one terminal device according to the physical layer multicast beamforming or the precoding matrix, wherein the first control information is used for indicating time-frequency resources of the multicast data, and the first control information further comprises a group identifier of the first multicast group.

5. The method according to any of claims 1-4, wherein the multicast data is carried in a second time-frequency resource, wherein the second time-frequency resource is the same as the frequency-domain resource of the first time-frequency resource, or wherein the frequency-domain resource of the second time-frequency resource is a subset of the frequency-domain resource of the first time-frequency resource.

6. The method according to any of claims 1-5, wherein the first device is a network device or the first device is a terminal device in the first multicast group.

7. The method according to any of claims 1 to 6, wherein the first device sends one SRS configuration information to the at least one terminal device, or the first device sends corresponding SRS configuration information to each terminal device in the at least one terminal device, and the SRS configuration information corresponding to each terminal device is the same.

8. A method for receiving data, the method comprising:

the method comprises the steps that a first terminal device receives channel Sounding Reference Signal (SRS) configuration information from a first device, wherein the SRS configuration information indicates a first time-frequency resource for transmitting an SRS, a sequence of the SRS and an antenna port for transmitting the SRS;

the first terminal device sends a first SRS to the first device on the first time-frequency resource, the first terminal device belongs to a first multicast group, the first time-frequency resource carries at least one SRS from at least one terminal device in the first multicast group, and the first SRS belongs to the at least one SRS, and the at least one SRS is used for the first device to determine multicast channel state information;

and the first terminal equipment receives the multicast data from the first equipment.

9. The method of claim 8, wherein the at least one SRS is transmitted over a same antenna port.

10. The method according to claim 8 or 9, characterized in that the method further comprises:

the first terminal device sends antenna port indication information to the first device, where the antenna port indication information is used to indicate the number of antenna ports of the first terminal device, or a set of antenna port indexes of the first terminal device; the antenna port indication information is used for the first device to determine the antenna port for transmitting the SRS.

11. The method according to any one of claims 8-10, further comprising:

the first terminal device receives first control information from the first device, where the first control information is used to indicate time-frequency resources of the multicast data, where the first control information further includes a group identifier of the first multicast group, and the first control information is sent by the first device according to the physical layer multicast beamforming or the precoding matrix.

12. The method according to any of claims 8-11, wherein the multicast data is carried in a second time-frequency resource, wherein the second time-frequency resource is the same as the frequency-domain resource of the first time-frequency resource, or wherein the frequency-domain resource of the second time-frequency resource is a subset of the frequency-domain resource of the first time-frequency resource.

13. The method according to any of claims 8-12, wherein the first device is a network device or the first device is a terminal device in the first multicast group.

14. A communication apparatus, characterized in that the communication apparatus comprises:

a sending module, configured to send, to at least one terminal device in a first multicast group, SRS configuration information indicating a first time-frequency resource used for sending an SRS, a sequence of the SRS, and an antenna port used for sending the SRS;

a receiving module, configured to receive at least one SRS from the at least one terminal device on the first time-frequency resource, and determine multicast channel status information based on the at least one SRS, where the time-frequency resources carrying the at least one SRS are the same, and sequences of the at least one SRS are the same;

the processing module is used for determining physical layer multicast beam forming or a pre-coding matrix according to the multicast channel state information;

the sending module is further configured to send multicast data to the at least one terminal device according to the physical layer multicast beamforming or the precoding matrix.

15. The apparatus of claim 14, wherein the at least one SRS is transmitted through a same antenna port.

16. The apparatus according to claim 14 or 15, wherein the receiving module is further configured to receive at least one antenna port indication information from the at least one terminal device, where the antenna port indication information is used to indicate the number of antenna ports of a corresponding terminal device or a set of antenna port indexes of the corresponding terminal device;

the processing module is further configured to determine the antenna port for transmitting the SRS according to the at least one antenna port indication information.

17. The apparatus of any one of claims 14 to 16, wherein the sending module is further configured to send first control information to the at least one terminal device according to the physical layer multicast beamforming or the precoding matrix, where the first control information is used to indicate time-frequency resources of the multicast data, and the first control information further includes a group identifier of the first multicast group.

18. The apparatus according to any of claims 14-17, wherein the multicast data is carried in a second time-frequency resource, wherein the second time-frequency resource is the same as the frequency-domain resource of the first time-frequency resource, or wherein the frequency-domain resource of the second time-frequency resource is a subset of the frequency-domain resource of the first time-frequency resource.

19. The apparatus according to any of claims 14-18, wherein the communication apparatus is a network device or the communication apparatus is a terminal device in the first multicast group.

20. The apparatus according to any of claims 14-19, wherein the communications apparatus sends one SRS configuration information to the at least one terminal device, or the communications apparatus sends corresponding SRS configuration information to each terminal device of the at least one terminal device, and the SRS configuration information corresponding to each terminal device is the same.

21. A communication apparatus, characterized in that the communication apparatus comprises:

a receiving module, configured to receive SRS configuration information from a first device, where the SRS configuration information indicates a first time-frequency resource used for sending an SRS, a sequence of the SRS, and an antenna port used for sending the SRS;

a transmitting module, configured to transmit a first SRS to the first device on the first time/frequency resource, where the communication apparatus belongs to a first multicast group, the first time/frequency resource carries at least one SRS from at least one terminal device in the first multicast group, and the first SRS belongs to the at least one SRS, and the at least one SRS is used by the first device to determine multicast channel status information;

the receiving module is further configured to receive multicast data from the first device.

22. The apparatus of claim 21, wherein the at least one SRS is transmitted over a same antenna port.

23. The apparatus according to claim 21 or 22, wherein the sending module is further configured to send antenna port indication information to the first device, where the antenna port indication information is used to indicate the number of antenna ports of the communication apparatus or a set of antenna port indexes of the communication apparatus; the antenna port indication information is used for the first device to determine the antenna port for transmitting the SRS.

24. The apparatus of any one of claims 21-23, wherein the receiving module is further configured to receive first control information from the first device, the first control information being used to indicate time-frequency resources of the multicast data, wherein the first control information further includes a group identifier of the first multicast group, and the first control information is sent by the first device according to the physical layer multicast beamforming or the precoding matrix.

25. The apparatus according to any of claims 21-24, wherein the multicast data is carried on a second time-frequency resource, wherein the second time-frequency resource is the same as a frequency-domain resource of the first time-frequency resource, or wherein the frequency-domain resource of the second time-frequency resource is a subset of the frequency-domain resource of the first time-frequency resource.

26. The apparatus of any of claims 21-25, wherein the first device is a network device or the first device is a terminal device in the first multicast group.

27. A communication apparatus, characterized in that the communication apparatus comprises:

a processor and a communication interface;

the processor to execute a computer program or instructions stored in the communication device to cause the communication device to perform the method of any of claims 1 to 7.

28. A communication apparatus, characterized in that the communication apparatus comprises:

a processor and a communication interface;

the processor to execute a computer program or instructions stored in the communication device to cause the communication device to perform the method of any of claims 8 to 13.

29. A computer-readable storage medium having stored therein instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1 to 7 or 8-13.

30. A communication system, characterized in that the communication system comprises a communication device according to any of claims 14-20 and a communication device according to any of claims 21-26.