CN114747236B

CN114747236B - Method and communication device for hybrid automatic repeat request (HARQ) feedback

Info

Publication number: CN114747236B
Application number: CN201980102595.2A
Authority: CN
Inventors: 王俊伟
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2023-07-18
Anticipated expiration: 2039-12-04
Also published as: WO2021109037A1; CN114747236A

Abstract

The application provides a hybrid automatic repeat request (HARQ) feedback method and a communication device. The method comprises the following steps: receiving first downlink data, wherein the first downlink data is broadcast multicast data; and transmitting the HARQ feedback information of the first downlink data on a unicast feedback channel. The terminal device sends the HARQ feedback information of the broadcast multicast data on the unicast feedback channel, so that the resource waste caused by sending the HARQ feedback information of the broadcast multicast data on the independent feedback channel can be reduced. Meanwhile, since each terminal device sends the HARQ feedback information on the unicast feedback channel of the terminal device, the network device can identify which terminal device the received plurality of HARQ feedback information is sent by, and accordingly the network device can adaptively adjust the MC order of the retransmission data according to the channel condition of the terminal device.

Description

Method and communication device for hybrid automatic repeat request (HARQ) feedback

Technical Field

The present application relates to the field of wireless communications, and more particularly, to a method and a communication apparatus for hybrid automatic repeat request HARQ feedback.

Background

In the current communication system, after receiving downlink data sent by a sending end, a receiving end needs to send hybrid automatic repeat request (hybrid automatic repeat request, HARQ) feedback information determined according to a decoding result to the sending end. If the sending is successful, feeding back Acknowledgement (ACK); if the transmission fails, a negative-acknowledgement (NACK) is fed back or not fed back. And if the HARQ feedback information received by the transmitting end is NACK, the transmitting end retransmits the downlink data.

The broadcast mode and the multicast mode are data transmission modes proposed for improving transmission efficiency. The broadcast mode indicates that the data sent by the sender can be received by all receivers. The multicast mode indicates that the data sent by the sender can be received by only the receivers in the specific group.

In the prior art, the same feedback channel is allocated to all receiving ends in the broadcast mode, that is, all receiving ends send HARQ feedback information on the same feedback channel. The channel conditions of different receiving ends may be different, a receiving end with better channel conditions may be allocated with a smaller feedback channel, and a receiving end with worse channel conditions should be allocated with a larger feedback channel. Therefore, the existing scheme of allocating a feedback channel to a receiving end in a broadcast mode cannot be adapted to the receiving end having different channel conditions, and in addition, there is a problem of resource waste. The existing scheme for distributing feedback channels to the receiving end in the multicast mode also has similar problems.

Disclosure of Invention

The application provides a HARQ feedback method, which aims to achieve the purpose of saving resources under the condition that HARQ feedback information of broadcast multicast data is sent on a unicast feedback channel.

In a first aspect, a method for HARQ feedback is provided, the method comprising: receiving first downlink data, wherein the first downlink data is broadcast multicast data; and transmitting the HARQ feedback information of the first downlink data on a unicast feedback channel.

Based on the technical scheme, the terminal equipment sends the HARQ feedback information of the broadcast multicast data on the unicast feedback channel, so that the resource waste caused by sending the HARQ feedback information of the broadcast multicast data on the independent feedback channel can be reduced. Meanwhile, since each terminal device transmits HARQ feedback information on a unicast feedback channel of the terminal device, the network device can identify which terminal device the received plurality of HARQ feedback information is transmitted to, respectively.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: receiving a first scheduling signaling, wherein the first scheduling signaling indicates a first scheduling resource, the first scheduling resource is a transmission resource of the first downlink data, and the first scheduling signaling is a unicast scheduling signaling; wherein receiving the first downlink data comprises: the first downlink data is received on the first scheduling resource.

Based on the scheme, the network equipment sends the scheduling signaling indicating the transmission resources of the broadcast multicast data to the terminal equipment in a unicast mode, so that the condition of missing detection of the terminal equipment can be reduced to a certain extent. Meanwhile, the scheduling signaling also indicates a unicast feedback channel, so that the network device does not need to additionally indicate the terminal device to send HARQ feedback information of broadcast multicast data on the unicast feedback channel.

With reference to the first aspect, in certain implementations of the first aspect, the receiving the first scheduling signaling includes: determining the first scheduling signaling according to a first radio network temporary identity (radio network tempory identity, RNTI), the first RNTI being associated with a second RNTI, the first RNTI being a unicast RNTI and the second RNTI being a broadcast multicast RNTI; the receiving first downlink data includes: and determining the first downlink data according to the second RNTI.

Based on the above scheme, the first RNTI associated with the broadcast multicast RNTI is used as a scrambling code to receive the first scheduling signaling, and it can be determined that broadcast multicast data is transmitted on the resource indicated by the first scheduling signaling. The problem that scrambling code errors occur when the terminal equipment adopts the unicast RNTI as the scrambling code to receive the first scheduling signaling is avoided.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: configuration information is received, the configuration information including the first RNTI, or the first RNTI and the second RNTI.

With reference to the first aspect, in certain implementations of the first aspect, the first scheduling signaling further includes first indication information, where the first indication information indicates transmission of the first downlink data on the first scheduling resource.

With reference to the first aspect, in certain implementations of the first aspect, the receiving the first scheduling signaling includes: detecting a first scheduling channel in a predefined search space; the first scheduling signaling is received on the first scheduling channel.

With reference to the first aspect, in certain implementations of the first aspect, detecting the first scheduling channel in a predefined search space includes: determining the predefined search space according to a predefined set of control resources; the first scheduling channel is detected in the predefined search space.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: receiving a second scheduling signaling, wherein the second scheduling signaling indicates a second scheduling resource, the second scheduling resource is a transmission resource of the first downlink data, and the second scheduling signaling is a broadcast scheduling signaling or a multicast scheduling signaling; wherein receiving the first downlink data comprises: receiving the first downlink data on the second scheduling resource; wherein transmitting the HARQ feedback information of the first downlink data on the unicast feedback channel includes: and transmitting HARQ feedback information of the first downlink data according to the sequence of the second scheduling signaling on a time unit on the unicast feedback channel.

Based on the scheme, the network equipment adopts a broadcasting mode to send the scheduling signaling of the transmission resource of the broadcast multicast data to the terminal equipment, so that signaling overhead can be saved.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: receiving a third scheduling signaling and a downlink allocation index (downlink assignment index, DAI) corresponding to the third scheduling signaling, wherein the third scheduling signaling indicates a third scheduling resource, the third scheduling resource is a transmission resource of second downlink data, the second downlink data is unicast data, the third scheduling signaling is unicast scheduling signaling, and the DAI counts scheduling signaling in an accumulated manner according to the sequence of sending the second scheduling signaling and the third scheduling signaling; wherein transmitting the HARQ feedback information of the first downlink data on the unicast feedback channel according to the ordering of the second scheduling signaling in the time unit includes: and transmitting HARQ feedback information of the first downlink data on the unicast feedback channel according to the ordering of the second scheduling signaling and the third scheduling signaling on a time unit and the value of the DAI.

Based on the above scheme, the network device indicates the transmission resource for transmitting the broadcast multicast data by sending the broadcast scheduling signaling or the multicast scheduling signaling to the terminal device, and the DAI counter is incremented by 1 every time a broadcast scheduling signaling or a multicast scheduling signaling is sent. Therefore, the HARQ feedback information of the broadcast multicast data can be sent on the unicast feedback channel, and simultaneously, the air interface signaling for the network equipment to send the scheduling signaling is saved.

In a second aspect, a method of HARQ feedback is provided, the method comprising: transmitting the first downlink data in a broadcast or multicast mode; and receiving HARQ feedback information of the first downlink data from the first terminal equipment on a unicast feedback channel of the first terminal equipment.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: transmitting a first scheduling signaling to the first terminal equipment in a unicast mode, wherein the first scheduling signaling indicates a first scheduling resource, and the first scheduling resource is a transmission resource of the first downlink data; wherein, the first downlink data is sent in a broadcast or multicast mode, which comprises the following steps: the first downlink data is transmitted on the first scheduling resource in a broadcast or multicast manner.

With reference to the second aspect, in some implementations of the second aspect, the sending, in a unicast manner, the first scheduling signaling to the first terminal device includes: scrambling the first scheduling signaling by adopting a first Radio Network Temporary Identifier (RNTI), wherein the first RNTI is associated with a second RNTI, the first RNTI is a unicast RNTI, and the second RNTI is a broadcast multicast RNTI; transmitting the first scheduling signaling to the first terminal device in a unicast mode; the method for transmitting the first downlink data in a broadcast or multicast mode comprises the following steps: scrambling the first downlink data with the second RNTI; the first downstream data is transmitted in a broadcast or multicast manner.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: and sending configuration information to the first terminal equipment, wherein the configuration information comprises the first RNTI or the first RNTI and the second RNTI.

With reference to the second aspect, in some implementations of the second aspect, the first scheduling signaling further includes first indication information, where the first indication information indicates transmission of the first downlink data on the first scheduling resource.

With reference to the second aspect, in some implementations of the second aspect, the sending, in a unicast manner, the first scheduling signaling to the first terminal device includes: the first scheduling signaling is sent unicast to the first terminal device on a first scheduling channel, which is detected in a predefined search space.

With reference to the second aspect, in certain implementations of the second aspect, the predefined search space is determined according to a predefined set of control resources.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: transmitting a second scheduling signaling in a broadcast or multicast mode, wherein the second scheduling signaling indicates a second scheduling resource, and the second scheduling resource is a transmission resource of the first downlink data; wherein, the first downlink data is sent in a broadcast or multicast mode, which comprises the following steps: the first downlink data is transmitted on the second scheduling resource in a broadcast or multicast mode.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: transmitting a third scheduling signaling and a downlink allocation index DAI corresponding to the third scheduling signaling to the first terminal equipment in a unicast mode, wherein the third scheduling signaling indicates a third scheduling resource, the third scheduling resource is a transmission resource of second downlink data, the second downlink data is unicast data, the third scheduling signaling is unicast scheduling signaling, and the DAI counts the scheduling signaling in an accumulated manner according to the sequence of transmitting the second scheduling signaling and the third scheduling signaling.

It will be appreciated that the first aspect described above may be combined with the method provided in the second aspect.

In a third aspect, a communication apparatus is provided comprising respective modules or units for performing the method of the first aspect and any one of the possible implementations of the first aspect.

In a fourth aspect, there is provided a communications apparatus comprising means or units for performing the method of the second aspect and any one of the possible implementations of the second aspect.

In a fifth aspect, a communication device is provided that includes a processor. The processor is coupled to the memory and operable to execute instructions or data in the memory to implement the method of the first aspect and any one of the possible implementations of the first aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, and the processor is coupled to the communication interface.

In one implementation, the communication device is a terminal device. When the communication device is a terminal device, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the communication device is a chip configured in the terminal device. When the communication means is a chip arranged in the terminal device, the communication interface may be an input/output interface.

Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.

In a sixth aspect, a communication device is provided that includes a processor. The processor is coupled to the memory and operable to execute instructions or data in the memory to implement the method of the second aspect and any one of the possible implementations of the second aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, and the processor is coupled to the communication interface.

In one implementation, the communication apparatus is a network device. When the communication apparatus is a network device, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the communication device is a chip configured in a network device. When the communication means is a chip configured in a network device, the communication interface may be an input/output interface.

In a seventh aspect, there is provided a processor comprising: input circuit, output circuit and processing circuit. The processing circuit is configured to receive signals via the input circuit and to send signals via the output circuit, such that the processor performs the methods of the first to second aspects and any one of the possible implementations of the first to second aspects.

In a specific implementation process, the processor may be one or more chips, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example and without limitation, a receiver, the output signal may be output by, for example and without limitation, a transmitter and transmitted by a transmitter, and the input circuit and the output circuit may be the same circuit, which functions as the input circuit and the output circuit, respectively, at different times. The embodiments of the present application do not limit the specific implementation manner of the processor and the various circuits.

In an eighth aspect, a processing device is provided that includes a processor and a memory. The processor is configured to read instructions stored in the memory and is configured to receive a signal via the receiver and to transmit a signal via the transmitter to perform the method of the first aspect to the second aspect and any one of the possible implementations of the first aspect to the second aspect.

Optionally, the processor is one or more, and the memory is one or more.

Alternatively, the memory may be integrated with the processor or the memory may be separate from the processor.

In a specific implementation process, the memory may be a non-transient (non-transitory) memory, for example, a Read Only Memory (ROM), which may be integrated on the same chip as the processor, or may be separately disposed on different chips.

It should be appreciated that the related data interaction process, for example, transmitting the indication information, may be a process of outputting the indication information from the processor, and the receiving the capability information may be a process of receiving the input capability information by the processor. Specifically, the data output by the processor may be output to the transmitter, and the input data received by the processor may be from the receiver. Wherein the transmitter and receiver may be collectively referred to as a transceiver.

The processing means in the eighth aspect described above may be one or more chips. The processor in the processing device may be implemented by hardware or may be implemented by software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor, implemented by reading software code stored in a memory, which may be integrated in the processor, or may reside outside the processor, and exist separately.

In a ninth aspect, there is provided a computer program product comprising: a computer program (which may also be referred to as code, or instructions) which, when executed, causes the method of any one of the first to second aspects and any one of the possible implementations of the first to second aspects to be performed.

In a tenth aspect, a computer readable storage medium is provided, which stores a computer program (which may also be referred to as code, or instructions) which, when run on a computer, causes the computer to perform the method of the first to second aspects and any one of the possible implementations of the first to second aspects.

In an eleventh aspect, there is provided a communication system comprising: the aforementioned network device, and/or the terminal device.

Drawings

Fig. 1 is a schematic diagram of a communication system of a method provided in an embodiment of the present application.

Fig. 2 is a schematic diagram of a method for broadcast multicast HARQ feedback according to an embodiment of the present application.

Fig. 3 is a schematic flow chart of a method of HARQ feedback provided by an embodiment of the present application.

Fig. 4 is a schematic diagram of a method for receiving broadcast multicast data according to an embodiment of the present application.

Fig. 5 is a schematic flow chart of a method of HARQ feedback provided by an embodiment of the present application.

Fig. 6 is a schematic diagram of a method for HARQ feedback provided by an embodiment of the present application.

Fig. 7 is a schematic flowchart of a method of HARQ feedback provided by an embodiment of the present application.

Fig. 8 is a schematic diagram of a method for HARQ feedback provided in an embodiment of the present application.

Fig. 9 is a schematic diagram of a method for HARQ feedback provided in an embodiment of the present application.

Fig. 10 is a schematic diagram of a method for HARQ feedback provided in an embodiment of the present application.

Fig. 11 is a schematic block diagram of a communication device provided in an embodiment of the present application.

Fig. 12 is a schematic structural diagram of a terminal device provided in an embodiment of the present application.

Fig. 13 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

The technical solutions in the present application will be described below with reference to the accompanying drawings.

The technical solution of the embodiment of the application can be applied to various communication systems, for example: long term evolution (Long Term Evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile telecommunications system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) telecommunications system, fifth generation (5th generation,5G) mobile telecommunications system or new radio access technology (new radio access technology, NR), or next generation communications, such as 6G. The 5G mobile communication system may be a non-independent Networking (NSA) or independent networking (SA).

The technical solutions provided herein may also be applied to machine-type communication (machine type communication, MTC), inter-machine communication long term evolution technology (Long Term Evolution-machine, LTE-M), device-to-device (D2D) networks, machine-to-machine (machine to machine, M2M) networks, internet of things (internet of things, ioT) networks, or other networks. The IoT network may include, for example, an internet of vehicles. The communication modes in the internet of vehicles system are generally called as vehicle to other devices (V2X, X may represent anything), for example, the V2X may include: vehicle-to-vehicle (vehicle to vehicle, V2V) communication, vehicle-to-infrastructure (vehicle to infrastructure, V2I) communication, vehicle-to-pedestrian communication (vehicle to pedestrian, V2P) or vehicle-to-network (vehicle to network, V2N) communication, etc.

The technical scheme provided by the application can also be applied to future communication systems, such as a sixth generation mobile communication system and the like. The present application is not limited in this regard.

In this embodiment of the present application, the network device may be any device having a wireless transceiver function. The apparatus includes, but is not limited to: an evolved Node B (eNB), a radio network controller (radio network controller, RNC), a Node B (Node B, NB), a base station controller (base station controller, BSC), a base transceiver station (base transceiver station, BTS), a home base station (home evolved NodeB, or a home Node B, HNB, for example), a Base Band Unit (BBU), an Access Point (AP) in a wireless fidelity (wireless fidelity, wiFi) system, a wireless relay Node, a wireless backhaul Node, a transmission point (transmission point, TP), or a transmission reception point (transmission and reception point, TRP), etc., may also be 5G, such as NR, a gNB in a system, or a transmission point (TRP or TP), one or a group (including multiple antenna panels) of base stations in a 5G system, or may also be a network Node constituting a gNB or a transmission point, such as a baseband unit (BBU), or a Distributed Unit (DU), or a base station in a next generation communication 6G system, etc.

In some deployments, the gNB may include a Centralized Unit (CU) and DUs. The gNB may also include an active antenna unit (active antenna unit, AAU). The CU implements part of the functionality of the gNB and the DU implements part of the functionality of the gNB, e.g. the CU is responsible for handling non-real time protocols and services, implementing radio resource control (radio resource control, RRC), packet data convergence layer protocol (packet data convergence protocol, PDCP) layer functions. The DUs are responsible for handling physical layer protocols and real-time services, implementing the functions of the radio link control (radio link control, RLC), medium access control (media access control, MAC) and Physical (PHY) layers. The AAU realizes part of physical layer processing function, radio frequency processing and related functions of the active antenna. Since the information of the RRC layer eventually becomes information of the PHY layer or is converted from the information of the PHY layer, under this architecture, higher layer signaling, such as RRC layer signaling, may also be considered to be transmitted by DUs or by DUs and AAUs. It is understood that the network device may be a device comprising one or more of a CU node, a DU node, an AAU node. In addition, the CU may be divided into network devices in an access network (radio access network, RAN), or may be divided into network devices in a Core Network (CN), which is not limited in the embodiments of the present application.

In the embodiment of the present application, the terminal device may be referred to as a User Equipment (UE), a terminal (terminal), a Mobile Station (MS), a mobile terminal (mobile terminal), or the like; the terminal device may also communicate with one or more core networks via a radio access network (radio access network, RAN). The terminal device can also be called an access terminal, subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user equipment. The terminal device may also be a cellular telephone, a cordless telephone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal digital assistant, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a vehicle with communication capabilities, a wearable device, a terminal device in a future 5G network, etc. The embodiments of the present application are not limited in this regard.

Fig. 1 is a schematic diagram of a communication system suitable for use in the method provided in the embodiments of the present application.

As shown in fig. 1, the communication system may include at least one network device, such as network device 110 shown in fig. 1, and the communication system 100 may include one or more terminal devices, such as terminal device 120 and terminal device 130 shown in fig. 1. The network device may transmit downlink data to the terminal device in a unicast mode, a multicast mode, or a broadcast mode. The unicast mode is that downlink data transmitted by a network device is received by only one terminal device, or only one terminal device is allowed to receive. For example, in fig. 1, network device 110 transmits downstream data to terminal device 120 in unicast mode. In this case, only the terminal device 120 can receive the downlink data transmitted from the network device 110. The multicast mode is that downlink data transmitted by a network device can be received by only a specific terminal device. For example, multimedia multicast service data transmitted by a network device may be received by only terminal devices subscribed to the service data or terminal devices interested in the service data. For example, in fig. 1, the network device 110 sends downlink data in the multicast mode, and if the terminal device 120 subscribes to the downlink data or is interested in the downlink data, the terminal device 120 may receive the downlink data; otherwise, the terminal device 120 cannot receive the downlink data. The broadcast mode is that downlink data transmitted by a network device can be received by all terminal devices within the coverage area of the network device. For example, in fig. 1, the network device 110 may transmit downlink data in a broadcast mode, and both the terminal device 120 and the terminal device 130 may receive the downlink data.

It should be understood that the figure shows only one network device and two terminal devices for illustration, but this should not constitute any limitation to the present application. In the communication system, a greater number of terminal devices and a greater number of network devices may also be included. Each network device may transmit downlink data to a different terminal device in a unicast mode, a multicast mode, or a broadcast mode.

The network device uses different RNTIs to scramble the scheduling signaling indicating different transmission resources in order to distinguish different services or different unicast downlink data for different terminal devices. Correspondingly, the terminal equipment adopts the corresponding RNTI as a scrambling code to receive the scheduling signaling. Further, the network device adopts different RNTI to scramble the downlink data sent in different modes, and correspondingly, the terminal device adopts the corresponding RNTI as a scrambling code to receive the downlink data.

For example, the network device configures different cell radio network temporary identities (cell radio network tempory identity, C-RNTIs) to different terminal devices, and there is a one-to-one correspondence between each terminal device and the C-RNTI for which the network device is configured. Further, the network device scrambles scheduling signaling indicating transmission resources of unicast downlink data using the C-RNTI. Correspondingly, the terminal equipment receives the scheduling signaling by taking the C-RNTI configured by the network equipment as a scrambling code. If the terminal equipment receives the scheduling signaling successfully by using the C-RNTI allocated by the network equipment, the scheduling signaling is considered to be sent by the network equipment for the terminal equipment. Further, the network device scrambles unicast downlink data with the C-RNTI. Correspondingly, the terminal equipment adopts the C-RNTI as a scrambling code to receive unicast downlink data transmitted on the transmission resource indicated by the scheduling signaling.

For another example, the network device configures a paging radio network temporary identity (paging radio network tempory identity, P-RNTI) to the terminal device. Further, the network device scrambles scheduling signaling indicating transmission resources of paging control information using the P-RNTI. Correspondingly, the terminal equipment receives the scheduling signaling by taking the P-RNTI as a scrambling code. If the terminal equipment successfully receives the scheduling signaling with the P-RNTI, the downlink data transmitted on the transmission resource indicated by the scheduling signaling is considered to be paging control information. Further, the network device scrambles the paging control information with the P-RNTI. Correspondingly, the terminal equipment adopts the P-RNTI as a scrambling code to receive paging control information.

For another example, the network device configures different multicast radio network temporary identifiers (groupcast radio network tempory identity, groupcast-RNTIs) for different multicast or broadcast downlink data to the terminal device, and there is a one-to-one correspondence between each multicast downlink data or each broadcast downlink data and the groupcast-RNTIs. Further, the network device adopts the groupcast-RNTI to scramble the scheduling signaling indicating the transmission resources of the multicast downlink data or the broadcast downlink data. Correspondingly, the terminal equipment receives the scheduling signaling by taking the group cast-RNTI allocated by the network equipment as a scrambling code. If the terminal equipment receives the scheduling signaling successfully, the downlink data transmitted by the network equipment on the transmission resource indicated by the scheduling signaling is considered to be multicast downlink data or broadcast downlink data interested by the terminal equipment. Further, the terminal equipment adopts the groupcast-RNTI as a scrambling code to receive multicast downlink data or broadcast downlink data transmitted on a transmission resource indicated by the scheduling signaling.

Further, in order to improve the efficiency of the downlink transmission of the network device, in the case that the network device sends unicast downlink data to the terminal device in the unicast mode, the network device adaptively adjusts the order of modulation and coding (modulation and coding, MC) of the unicast downlink data according to the channel quality condition between the terminal device and the network device. And after receiving the unicast downlink data sent by the network device, the terminal device can send HARQ feedback information determined according to the demodulation and decoding results to the network device. If the terminal equipment receives the unicast downlink data successfully, sending ACK to the network equipment; and if the terminal equipment fails to receive the unicast downlink data, sending NACK to the network equipment. After the network device receives the NACK feedback from the terminal device, the unicast downlink data is retransmitted to the terminal device so as to ensure the guarantee of the service quality requirement.

In the case that the network device transmits multicast downlink data to the terminal device in a multicast mode or transmits broadcast downlink data to the terminal device in a broadcast mode, there are three modes in which the terminal device transmits HARQ feedback information to the network device:

mode one: HARQ NACK only, i.e. only feedback NACK messages, and different terminal devices send NACKs on the same feedback channel.

If the terminal device receives the multicast downlink data or broadcast downlink data sent by the network device, the terminal device first demodulates and decodes the multicast downlink data or broadcast downlink data. If the decoding result is wrong, namely, the multicast downlink data or the broadcast downlink data is not received correctly, NACK is sent to the network equipment; if the decoding result is correct, that is, the multicast downlink data or the broadcast downlink data is correctly received, no feedback is performed.

If the network device detects that the terminal device sends NACK, the network device resends the multicast downlink data or broadcast downlink data to the terminal device.

Mode two: HARQ ACK only, i.e. only feedback ACK messages, and different terminal devices send ACKs on the same feedback channel.

If the terminal device receives the multicast downlink data or broadcast downlink data sent by the network device, the terminal device first demodulates and decodes the multicast downlink data or broadcast downlink data. If the decoding result is correct, namely, the multicast downlink data or the broadcast downlink data is correctly received, sending ACK to the network equipment; if the decoding result is wrong, that is, the multicast downlink data or the broadcast downlink data is not received correctly, no feedback is performed.

Mode three: HARQ ACK/NACK, i.e. feedback ACK message or NACK message, and different terminal devices send HARQ feedback information on different feedback channels.

That is, before the network device sends the multicast downlink data or broadcast downlink data to different terminal devices, different feedback channels are allocated to each terminal device receiving the multicast downlink data or broadcast downlink data, and the sizes of the feedback channels allocated by the network device to different terminal devices are the same. For example, as shown in fig. 2, the network device transmits scheduling signaling indicating a physical downlink shared channel (physical downlink shared channel, PDSCH) to the terminal device # 1-terminal device #7 through a physical downlink control channel (physical downlink control channel, PDCCH) at a time slot n, the PDSCH is a transmission resource for multicast or broadcast downlink data, the scheduling signaling indicates that the network device may transmit multicast or broadcast downlink data to the terminal device # 1-terminal device #7 through the PDSCH at the time slot n, and indicates that the terminal device # 1-terminal device #7 transmits HARQ feedback information through a feedback channel allocated to each terminal device at a time slot n+2, and the feedback channels of the terminal device # 1-terminal device #7 are the same in size, for example, the terminal device #1 transmits HARQ feedback information at symbols 1-2 of the time slot n+2, the terminal device #2 transmits HARQ feedback information at symbols 3-4 of the time slot n+2, and the terminal device #7 transmits HARQ feedback information at symbols 13-14 of the time slot n+2.

Further, if the decoding result of the multicast downlink data or the broadcast downlink data sent by one of the terminal devices to the network device is correct, the terminal device sends an ACK on a feedback channel allocated by the network device to the terminal device; if the decoding result is wrong, the terminal equipment sends NACK on a feedback channel allocated to the terminal equipment by the network equipment.

For the first mode, only feeding back the NACK message can reduce the number of feedback channels to some extent, but since each terminal device transmits NACK on the same feedback channel, the network device cannot identify which terminal device is feeding back NACK, and thus cannot adaptively adjust the order of retransmission downlink data MC according to the channel quality between the terminal device and the network device. If the code rate of the retransmission downlink data is low, the downlink data may not be correctly received for the terminal equipment with poor channel condition with the network equipment; and for the terminal equipment with good channel condition with the network equipment, the retransmission downlink data with higher code rate can be correctly received, so that the downlink data with low code rate can cause resource waste, because the low code rate needs more air interface resources.

With the second manner described above, since each terminal device transmits ACK on the same feedback channel, the network device cannot determine whether to retransmit the downlink data, and is therefore not adopted.

For the third mode, each receiving end transmits HARQ feedback information on feedback channels with the same size, and it is difficult to adapt to terminal devices with different channel conditions. The terminal equipment with good channel condition between the network equipment can use less feedback channels, and the terminal equipment with poor channel condition between the network equipment can use more feedback channels, so that the problem of resource waste exists. As shown in fig. 1, the terminal device 130 is relatively far from the network device 110, and thus the channel quality between the terminal device 130 and the network device 110 is poor; and terminal device 120 is closer to network device 110, so the channel quality between terminal device 120 and network device 110 is better.

In view of this, the present application provides a method for HARQ feedback, so as to reduce resource waste caused by transmitting HARQ feedback information on an individual HARQ feedback channel by multicast downlink data or broadcast downlink data, and identify which terminal device the network device may transmit HARQ feedback information, so as to adjust the order of MC according to channel quality between the terminal device and the network device, thereby saving air interface resources.

The method provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

In order to facilitate understanding of the embodiments of the present application, the following description is made before describing the embodiments of the present application.

First, in the embodiments of the present application, "for indicating" may include for direct indication and for indirect indication, and may also include explicit indication and implicit indication. In the specific implementation process, the manner of indicating the information to be indicated is various, for example, but not limited to, the information to be indicated may be directly indicated, such as the information to be indicated itself or an index of the information to be indicated. The information to be indicated can also be indicated indirectly by indicating other information, wherein the other information and the information to be indicated have an association relation. It is also possible to indicate only a part of the information to be indicated, while other parts of the information to be indicated are known or agreed in advance. The indication of the information to be indicated may also be achieved by means of a pre-agreement (e.g. protocol specification) whether a certain cell is present, for example, thereby reducing the indication overhead to some extent.

Second, in the embodiments shown below, the first, second, and various numerical numbers are merely for convenience of description and are not intended to limit the scope of the embodiments of the present application. E.g. to distinguish between different scheduling signaling, etc.

Third, in the embodiments of the present application, the predefined may be, for example, a protocol predefined, or an artificial predefined. The "predefined" may be implemented by pre-storing corresponding codes, tables, or other means that may be used to indicate relevant information in devices (e.g., including terminal devices and network devices), and the specific implementation of the present application is not limited. Where "save" may refer to saving in one or more memories. The one or more memories may be provided separately or may be integrated in an encoder or decoder, processor, or communication device. The one or more memories may also be provided separately as part of a decoder, processor, or communication device. The type of memory may be any form of storage medium, and this application is not limited in this regard.

Fourth, the "protocol" referred to in the embodiments of the present application may refer to a standard protocol in the field of communications, and may include, for example, an LTE protocol, an NR protocol, and related protocols applied in a future communication system, which is not limited in this application.

Fifth, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, and c may represent: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c. Wherein a, b and c can be single or multiple respectively.

Sixth, in the embodiments of the present application, the descriptions of "when … …", "in the case of … …", "if" and the like all refer to that the device (e.g., the terminal device or the network device) will make a corresponding process under some objective condition, and are not limited in time, nor do the devices (e.g., the terminal device or the network device) require an action of determining when implemented, nor do other limitations mean that there are any other limitations.

Seventh, various embodiments are described in detail below in connection with various flowcharts, but it should be understood that these flowcharts and the associated descriptions of their respective embodiments are merely examples for ease of understanding and should not be construed as limiting the present application in any way. Each step in the flowcharts is not necessarily performed, and some steps may be skipped, for example. Moreover, the order of execution of the steps is not fixed nor limited to that shown in the drawings, and should be determined by its functions and inherent logic. The embodiments shown below illustrate the method provided by the embodiments of the present application, taking the interaction between the network device and the terminal device as an example. But this should not constitute any limitation to the present application. For example, the terminal device shown in the following embodiments may be replaced with a component (such as a chip, a system on a chip, or a circuit) configured in the terminal device. The network devices shown in the following embodiments may also be replaced with components (such as chips, chip systems or circuits, etc.) configured in the network devices.

The embodiments shown below are not particularly limited to the specific structure of the execution body of the method provided in the embodiments of the present application, as long as the communication can be performed by the method provided in the embodiments of the present application by running the program recorded with the code of the method provided in the embodiments of the present application, and for example, the execution body of the method provided in the embodiments of the present application may be a terminal device or a network device, or a functional module in the terminal device or the network device that can call the program and execute the program.

It should be noted that, broadcast multicast in the embodiments of the present application refers to transmitting data by broadcasting or multicasting. The broadcast multicast data may be service data (e.g., streaming media, video data) or signaling data.

Downlink data: refers to data in the direction from the network device to the terminal device, and in a side link scenario, downlink data may refer to data in the direction from one terminal device to another terminal device.

Fig. 3 shows a schematic flow chart of a method of HARQ feedback provided by an embodiment of the present application. As shown in fig. 3, the method 300 may include S310 and S320, each of which is described below.

S310, the network device sends the first downlink data. Correspondingly, the terminal device receives the first downlink data.

Wherein the first downlink data is broadcast multicast data. I.e. multicast data transmitted by the network device in multicast mode or broadcast data transmitted in broadcast mode, which data may be traffic data or signalling data. It will be appreciated that the broadcast multicast data transmitted by the network device may be received by a plurality of terminal devices.

The specific manner in which the network device indicates the transmission resource of the first downlink data is not limited in the embodiments of the present application.

In one implementation, the network device may indicate a first scheduling resource for transmitting the first downlink data by sending a first scheduling signaling to the terminal device. Wherein the first scheduling signaling is unicast scheduling signaling.

It can be appreciated that the network device sends the first scheduling signaling to the plurality of terminal devices in a unicast manner.

For ease of understanding and explanation, the following description will take as an example that the network device transmits the first scheduling signaling to one of the plurality of terminal devices.

As described above, the network device may scramble the unicast scheduling signaling with the C-RNTI, and further, the network device may scramble the unicast downlink data with the C-RNTI. Correspondingly, the terminal equipment adopts the C-RNTI as a scrambling code to receive unicast scheduling signaling and unicast downlink data. In case that the unicast scheduling signaling indicates transmission resources of broadcast multicast data, the terminal device demodulates and decodes the unicast scheduling signaling in a unicast manner, and errors may occur. Therefore, in the case where the unicast scheduling signaling sent by the network device to the terminal device indicates the transmission resource of the first downlink data, the terminal device is to determine whether the transmission resource indicated by the unicast scheduling signaling received from the network device is the transmission resource of the first downlink data or the transmission resource of the unicast data.

The embodiment of the application does not limit the specific way how the terminal device determines whether the transmission resource indicated by the unicast scheduling signaling received from the network device is the transmission resource of broadcast multicast data or the transmission resource of unicast data.

As one example, the network device may send configuration information to the terminal device. The configuration information includes a first RNTI, or a first RNTI and a second RNTI, the first RNTI is a unicast RNTI, the second RNTI is a broadcast multicast RNTI, i.e., the second RNTI corresponds to first downlink data sent by the network device to the terminal device, and the first RNTI is associated with the second RNTI. If the terminal device successfully receives the first scheduling signaling from the network device by using the first RNTI as the scrambling code, it may be determined that the transmission resource indicated by the first scheduling signaling is a transmission resource of the first downlink data.

The configuration information sent by the network device to the terminal device may only comprise the first RNTI, in which case the network device does not scramble the first downlink data sent to the terminal device. The configuration information sent by the network device to the terminal may further include a first RNTI and a second RNTI, in which case the network device may send scrambled first downlink data to the terminal device or may send unscrambled first downlink data to the terminal device.

It is understood that in case the network device transmits the same first downlink data to the plurality of terminal devices, the network device transmits the first configuration information to the plurality of terminal devices. The second RNTI in the configuration information received by each terminal device is the same, namely corresponds to the first downlink data sent by the network device; the first RNTI in the configuration information received by each terminal device may be the same or may be different, for example, the first RNTI corresponds to each terminal device one-to-one.

The specific manner in which the network device sends the configuration information is not limited, for example, the network device may send the configuration information to the terminal device by establishing a radio resource control (radio resource control, RCC) radio connection with the terminal device; alternatively, the network device may transmit the configuration information to the terminal device through a media access control (media access control, MAC) Control Element (CE).

Taking the example that the network device sends the configuration information to the terminal device through RRC signaling for explanation, the configuration information sent by the network device to the terminal device includes: (1) The pair-groupcast-RNTI-Value, that is, the pair-groupcast-RNTI (an example of the first RNTI) associated with the multicast broadcast RNTI is defined, and the pair-groupcast-RNTI is a unicast RNTI, which may be used by the terminal device as a scrambling code to receive unicast scheduling signaling for indicating transmission resources of broadcast multicast data; (2) group-RNTI-Value, i.e. group-RNTI (an example of the second RNTI) associated with the pair-group-RNTI is defined.

Further, the network device scrambles the first scheduling signaling with the first RNTI. Correspondingly, the terminal equipment adopts the first RNTI as a scrambling code to receive the first scheduling signaling. If the terminal equipment successfully receives the first scheduling signaling, the terminal equipment determines that the network equipment transmits first downlink data on a first transmission resource indicated by the first scheduling signaling. Further, the network device may also scramble the first downlink data sent to the terminal device by using the second RNTI. Correspondingly, the terminal equipment adopts the second RNTI as a scrambling code to receive the first downlink data. Alternatively, the network device may not scramble the first downstream data. Correspondingly, the terminal equipment does not perform descrambling processing on the first downlink data.

As shown in fig. 4, the network device transmits unicast scheduling signaling indicating a broadcast multicast PDSCH on a unicast PDCCH, and further transmits broadcast multicast data on the broadcast multicast PDSCH. The terminal equipment uses the first RNTI to determine unicast scheduling signaling, and further uses the second RNTI to determine broadcast multicast data.

It can be understood that if the terminal device receives the unicast scheduling signaling by using the first RNTI as the scrambling code, the manner of demodulating the unicast scheduling signaling is the same as the manner of demodulating the broadcast multicast scheduling signaling scrambled by the broadcast multicast RNTI.

For example, unicast scheduling signaling may include: a frequency domain resource allocation indication (frequency domain resource assignment), a time domain resource allocation indication (time domain resource assignment) and a modulation coding format (modulation and coding scheme).

Wherein the frequency domain resource allocation indicates a frequency domain location of a resource for indicating the network device to transmit data. The network device calculates a frequency domain resource allocation instruction according to the frequency domain information table of the resources for transmitting the broadcast multicast data when the terminal device receives the unicast scheduling signaling by taking the first RNTI as a scrambling code, wherein the frequency domain information table of the resources for transmitting the unicast data is configured for the terminal device. The time domain resource allocation indicates a time domain location of a resource for indicating the network device to transmit data. The network device calculates a time domain resource allocation indication according to a time domain information table of a resource for transmitting broadcast multicast data when the terminal device receives unicast scheduling signaling by taking a first RNTI as a scrambling code, wherein the time domain information table of the resource for transmitting unicast data is configured for the terminal device in advance and is different from the time domain information table of the resource for transmitting broadcast multicast data. The modulation coding format indicates a modulation coding format for indicating data transmitted by the network device. The network device determines the modulation coding format of the data transmitted by the network device according to the modulation coding format table of the broadcast multicast data under the condition that the terminal device receives the unicast scheduling signaling by taking the first RNTI as a scrambling code.

As another example, the first scheduling signaling sent by the network device to the terminal device may further carry first indication information, where the first indication information indicates that data transmitted on the first transmission resource indicated by the first scheduling signaling is first downlink data. The terminal device can determine that the transmission resource indicated by the unicast scheduling signaling is the transmission resource of the broadcast multicast data according to the first indication information.

In this case, the network device may scramble the first scheduling signaling with the C-RNTI. Correspondingly, the terminal equipment adopts the C-RNTI as a scrambling code to receive the first scheduling signaling.

As yet another example, the network device sends predefined search space (search space) configuration information to the terminal device. Further, the terminal device detects the first scheduling channel in the predefined search space. Further, the terminal device receives a first scheduling signaling on the first scheduling channel.

The terminal device may determine that the transmission resource indicated by the first scheduling signaling received on the first scheduling channel is a transmission resource of the first downlink data.

Optionally, the network device may also send predefined control resource set (control resource set, CORESET) configuration information to the terminal device. Further, the terminal device determines the predefined search space according to the predefined CORESET.

In another implementation, the network device may indicate the second scheduling resource to transmit the first downlink data by sending a second scheduling signaling to the terminal device. Wherein the second scheduling signaling is a broadcast scheduling signaling or a multicast scheduling signaling.

It will be appreciated that the network device sends the second scheduling signaling to the plurality of terminal devices in a broadcast or multicast manner.

S320, the terminal equipment sends HARQ feedback information of the first downlink data to the network equipment.

And the terminal equipment sends HARQ feedback information of the first downlink data to the network equipment on a unicast feedback channel of the terminal equipment.

It is understood that the network device may send the first downlink data to a plurality of terminal devices, each of which sends HARQ feedback information for the first downlink data on a unicast feedback channel corresponding to each of the terminal devices.

For ease of understanding and explanation, the following description will be given by taking an example in which one of a plurality of terminal apparatuses transmits HARQ feedback information to a network apparatus. It may be appreciated that other terminal devices may also send HARQ feedback information of the first downlink data to the network device by using a method described below.

As described above, the network device may transmit the first downlink data on the first transmission resource indicated by the first scheduling signaling, or may transmit the first downlink data on the second transmission resource indicated by the second scheduling signaling.

It is understood that the first scheduling signaling sent by the network device to the terminal device may also indicate a unicast feedback channel. And the terminal equipment sends the HARQ feedback information of the first downlink data to the network equipment on a unicast feedback channel indicated by the unicast scheduling signaling.

Under the condition that the network equipment indicates transmission resources for transmitting the first downlink data through the second scheduling signaling, the network equipment can send indication information for indicating the terminal equipment to send HARQ feedback information of the first downlink data on a unicast feedback channel to the terminal equipment in a high-layer signaling mode before sending the second scheduling signaling. For example, the network device may send the indication information to the terminal device by establishing an RCC wireless connection with the terminal device; alternatively, the network device may send the indication information to the terminal device through the MAC CE.

And the terminal equipment can send the HARQ feedback information of the first downlink data on the unicast feedback channel according to the ordering of the second scheduling signaling on the time unit according to the indication information. Wherein the time unit may be a time slot.

If the terminal equipment only receives one first downlink data, the ordering of the second scheduling signaling on the time slot does not need to be considered.

And if the terminal equipment receives a plurality of first downlink data, the HARQ feedback information of each first downlink data is sequentially sent according to the sequence of the time slots of the transmission resources of each first downlink data. For example, the terminal device receives the first downlink data through the second transmission resource with the time slot being time slot n, and the terminal device receives the second first downlink data through the second transmission resource with the time slot being time slot n+4, and then the terminal device sends the HARQ feedback information of the first downlink data on the unicast feedback channel according to the sequence of the time slots with the second transmission resource, and then sends the HARQ feedback information of the second first downlink data on the unicast feedback channel; or, the terminal device may first send the HARQ feedback information of the second first downlink data on the unicast feedback channel, and then send the HARQ feedback information of the first downlink data on the unicast feedback channel.

Optionally, the terminal device may further send HARQ feedback information of each downlink data according to an ordering of slots in which the second scheduling signaling indicating the second transmission resource is located.

It may be understood that the terminal device may receive each second scheduling signaling sent by the network device, or may not receive some second scheduling signaling in the plurality of second scheduling signaling sent by the network device, that is, the terminal device may have a missed detection condition.

And under the condition that the terminal equipment has missed detection, the terminal equipment cannot receive the first downlink data sent by the network equipment on the second transmission resource indicated by the missed second scheduling signaling, and further cannot send HARQ feedback information of the first downlink data. Therefore, if the HARQ feedback information of the first downlink data is sent only according to the ordering of the time slots in which the second scheduling signaling is located, or only according to the ordering of the time slots in which the second transmission resources indicated by the second scheduling signaling are located, the terminal device cannot feed back the HARQ feedback information of the first downlink data sent by the network device on the second transmission resources indicated by the missed second scheduling signaling. And the network device cannot accurately judge whether the first downlink data needs to be retransmitted or not according to the received HARQ feedback information, or cannot judge which first downlink data needs to be retransmitted.

Therefore, under the condition that the terminal equipment has missed detection, the terminal equipment sends HARQ feedback information of the first downlink data according to the sequence of the time slot where the second scheduling signaling is located, the time slot where the third scheduling signaling is located and the DAI corresponding to the third scheduling signaling. The third scheduling signaling indicates a third transmission resource, the third transmission resource is used for transmitting second downlink data, the second downlink data is unicast data, the DAI counts up the scheduling signaling according to the sequence of the second scheduling signaling and the third scheduling signaling sent by the network device, that is, the DAI counter is increased by 1 every time the network device sends one second scheduling signaling or one third scheduling signaling.

Optionally, the terminal device may further send HARQ feedback information of the first downlink data according to the ordering of the time slot where the second transmission resource is located and the time slot where the third transmission resource is located, and the DAI corresponding to the third scheduling signaling.

It will be appreciated that the ordering of the time slots in which the second scheduling signalling is located may be before the time slots in which the third scheduling signalling is located, or between the time slots in which the two third scheduling signalling are located, or after the time slots in which the third scheduling signalling is located.

For example, if the ordering of the second scheduling signaling received by the terminal device on the time slot is prior to the third scheduling signaling received by the terminal device, and the DAI _N Not equal to M, the terminal device sends DAI on unicast feedback channel _N Before HARQ feedback information of the corresponding second downlink data, DAI is sent _N -1 NACK, wherein DAI _N For sorting the DAI corresponding to the last third scheduling signaling on the time slot, M is the number of second scheduling signaling received by the terminal device.

For another example, if the ordering of the time slots in which the second scheduling signaling received by the terminal device is located is between the time slots in which the third scheduling signaling received by the terminal device is located, and the DAI _N -DAI ₁ Not equal to M+1, the terminal device is transmitting DAI ₁ After the HARQ feedback information of the corresponding second downlink data, the DAI is sent _N Before HARQ feedback information of the corresponding second downlink data, DAI is sent _N -DAI ₁ -1 HARQ feedback information NACK, wherein DAI _N To sort the DAI corresponding to the last third scheduling signaling on the time slot, the DAI ₁ For the DAI corresponding to the first third scheduling signaling ordered on the time slot, M is the number of second scheduling signaling received by the terminal device.

For another example, if the ordering of the time slots in which the second scheduling signaling received by the terminal device is located is after the time slots in which the third scheduling signaling received by the terminal device is located, the terminal device does not send the HARQ feedback information of the first downlink data.

Optionally, if the network device receives HARQ feedback information of the first downlink data sent by the plurality of terminal devices on the unicast feedback channel of each terminal device, and the plurality of HARQ feedback information are NACK, the network device may determine the MC order of retransmitting the downlink data according to the channel condition of the terminal device with the worst channel condition with the network device.

Optionally, the second scheduling signaling sent by the network device to the terminal device may also indicate a broadcast multicast feedback channel. The terminal device may send HARQ feedback information for the first downlink data on the broadcast multicast feedback channel.

In the embodiment of the application, the terminal equipment sends the HARQ feedback information of the broadcast multicast data on the unicast feedback channel, so that the resource waste caused by sending the HARQ feedback information of the broadcast multicast data on the independent feedback channel can be reduced. Meanwhile, since each terminal device transmits HARQ feedback information on a unicast feedback channel of the terminal device, the network device can identify which terminal device the received plurality of HARQ feedback information is transmitted to, respectively. Further, in the case of receiving a plurality of NACKs, the network device may adaptively adjust the MC order of retransmitting the downlink data according to the channel condition between the terminal device and the network device. The network device configures a unicast feedback channel for each terminal device, and considers the channel condition between each terminal device and the network device, so that the HARQ feedback information of the broadcast multicast data is sent on the unicast feedback channel, and the performance of HARQ feedback can be ensured.

For a better understanding of the methods provided herein, the methods described above are further described below with reference to various examples and drawings.

It should be appreciated that the embodiments shown below are described with the network device interacting with one of a plurality of terminal devices for ease of understanding and explanation. But this should not constitute any limitation to the present application. The embodiment of the application is also applicable to the scene that the network equipment interacts with a plurality of terminal equipment.

Fig. 5 is a schematic flow chart of a method of HARQ feedback provided by another embodiment of the present application. The embodiment shown in fig. 5 describes in more detail an example in which the network device mentioned in S310 may indicate the first scheduling resource for transmitting the first downlink data by transmitting the first scheduling signaling to the terminal device. As shown in FIG. 5, the method 500 may include S510-S550, with various steps described below.

S510, the network equipment sends configuration information of the first RNTI and the second RNTI to the terminal equipment.

Wherein the first RNTI is a unicast RNTI and the second RNTI is a broadcast multicast RNTI. The terminal equipment can adopt the first RNTI as a scrambling code to receive unicast scheduling signaling sent by the network equipment or unicast data; the terminal device may receive the broadcast multicast scheduling signaling sent by the network device using the second RNTI as the scrambling code, or broadcast multicast data.

The specific manner of sending the configuration information by the network device is not limited, for example, the network device may send the configuration information to the terminal device by establishing RCC wireless connection with the terminal device; alternatively, the network device may send the configuration information to the terminal device through the medium access control MAC CE.

In one implementation, the first RNTI is associated with the second RNTI, i.e., there is a correspondence between the first RNTI and the second RNTI. The first RNTI is used for receiving unicast scheduling signaling indicating transmission resources of broadcast multicast data, and the second RNTI is used for receiving the broadcast multicast data. Table 1 shows a correspondence table between the first RNTI and the second RNTI.

TABLE 1

As shown in table 1, a first RNTI ₁ First RNTI ₂ First RNTI ₃ With a second RNTI ₁ Corresponding relation exists, a first RNTI ₄ First RNTI ₅ With a second RNTI ₂ There is a correspondence. If the configuration information received by the terminal device #1 includes the RNTI ₁ And a second RNTI ₁ Further, the terminal device #1 may employ the first RNTI ₁ As a scrambling code to receive unicast scheduling signaling, a second RNTI is adopted ₁ Broadcast multicast data is received as a scrambling code on a transmission resource indicated by the unicast scheduling signaling. If the configuration information received by the terminal device #2 includes the first RNTI ₂ And a second RNTI ₁ Further, the terminal device #2 may employ the first RNTI ₂ As a scrambling code to receive unicast scheduling signaling, a second RNTI is adopted ₁ Broadcast multicast data is received as a scrambling code on a transmission resource indicated by the unicast scheduling signaling. If the configuration information received by the terminal device #3 includes the first RNTI ₄ And a second RNTI ₂ Further, the terminal device #3 may employ the first RNTI ₄ As a scrambling code to receive unicast scheduling signaling, a second RNTI is adopted ₂ Broadcast multicast data is received as a scrambling code on a transmission resource indicated by the unicast scheduling signaling.

In another implementation, the first RNTI is a C-RNTI, i.e., the first RNTI is not associated with the second RNTI.

S520, the network device sends configuration information of the broadcast multicast channel to the terminal device.

Wherein, the broadcast multicast channel comprises unicast PDCCH and broadcast multicast PDSCH. The unicast PDCCH is used for transmitting unicast scheduling signaling, and the broadcast multicast PDSCH is used for transmitting broadcast multicast data.

The specific manner of sending the configuration information by the network device is not limited, for example, the network device may send the configuration information to the terminal device by establishing RCC wireless connection with the terminal device; alternatively, the network device may send the configuration information to the terminal device through the MAC CE.

The configuration information may include: configuration of data demodulation reference signals (demodulation reference signal, DMRS), modulation and coding scheme (modulation and coding scheme, MCS) table configuration, and configuration of data time domain resource allocation tables.

Wherein the contents of the time domain resource allocation table include: k0 information, S information, L information. k0 represents a time distance between a resource for transmitting broadcast multicast data and a PDCCH, k0=0, indicates that the resource for transmitting broadcast multicast data and the PDCCH are within one slot, and k0=1 indicates that the slot in which the resource for transmitting broadcast multicast data is located is the next slot of the slot in which the PDCCH is located. S denotes a start symbol of a resource transmitting broadcast multicast data, and the value is from 0 to 13.L represents the length of broadcast multicast data and has a value from 1 to 14. The PDCCH is used to transmit scheduling signaling indicating a broadcast multicast PDSCH.

And S530, the network equipment sends a first scheduling signaling to the terminal equipment.

The first scheduling signaling is unicast scheduling signaling, the first scheduling signaling indicates a first transmission resource, the first transmission resource is used for transmitting first downlink data, and the first downlink data is broadcast multicast data.

It is understood that the network device may send the first scheduling signaling to the terminal device on a unicast PDCCH. The first scheduling signaling also carries indication information for indicating the unicast HARQ feedback channel, wherein the indication information comprises time domain resource position, frequency domain resource position and feedback time sequence information of the unicast HARQ feedback channel.

As described previously, the network device may send configuration information of the associated first RNTI and second RNTI to the terminal device. In this case, the terminal device may receive the first scheduling signaling using the first RNTI as a scrambling code. If the terminal device successfully receives the first scheduling signaling, it may be determined that the data transmitted on the first transmission resource indicated by the first scheduling signaling is broadcast multicast data.

The network device may also send configuration information of the first RNTI and the second RNTI that are not associated to the terminal device. In this case, the terminal device may receive the first scheduling signaling using the first RNTI as a scrambling code. The first scheduling signaling may further carry first indication information, where the first indication information is used to indicate that data transmitted on the first transmission resource indicated by the first scheduling signaling is broadcast multicast data. If the terminal device successfully receives the first scheduling signaling, it may be determined that the data transmitted on the first transmission resource indicated by the first scheduling signaling is broadcast multicast data according to the first indication information carried in the first scheduling signaling.

S540, the network device sends the first downlink data to the terminal device.

The network device transmits first downlink data to the terminal device on the first transmission resource.

As described above, if the network device uses the second RNTI to scramble the first downlink data, the terminal device uses the second RNTI as a scrambling code to receive the first downlink data.

S550, the terminal equipment sends HARQ feedback information of the first downlink data to the network equipment.

As shown in fig. 6, the network device transmits unicast scheduling signaling #1 to the terminal device on unicast PDCCH at time slot n, the unicast scheduling signaling #1 indicating PDSCH1 transmitting unicast data and indicating HARQ feedback channel; the network device sends unicast scheduling signaling #2 to the terminal device on unicast PDCCH in time slot n+2, wherein the unicast scheduling signaling #2 indicates PDSCH2 for transmitting unicast data and indicates HARQ feedback channel; the network device sends unicast scheduling signaling #3 to the terminal device on unicast PDCCH in time slot n+3, wherein the unicast scheduling signaling #3 indicates PDSCHx for transmitting broadcast multicast data and indicates HARQ feedback channel; the network device sends unicast scheduling signaling #4 on unicast PDCCH to the terminal device in time slot n+6, the unicast scheduling signaling #4 indicating PDSCH4 transmitting unicast data and indicating HARQ feedback channel.

Then, the network device transmits unicast data #1 to the terminal device on PDSCH1, transmits unicast data #2 to the terminal device on PDSCH2, transmits broadcast multicast data #x to the terminal device on PDSCHx, and transmits unicast data #4 to the terminal device on PDSCH 4.

Then, the HARQ feedback information sent by the network device on the unicast feedback channel is: HARQ-1, HARQ-2, HARQ-x, HARQ-4, where HARQ-1 corresponds to HARQ feedback information for unicast data #1, HARQ-2 corresponds to HARQ feedback information for unicast data #2, HARQ-x corresponds to HARQ feedback information for broadcast multicast data # x, and HARQ-4 corresponds to HARQ feedback information for unicast data #4.

In the embodiment of the application, the network device indicates the transmission resource for transmitting the broadcast multicast data and indicates the HARQ feedback channel of the broadcast multicast data by sending the unicast scheduling signaling to the terminal device, so that the condition that the terminal device is missed can be reduced to a certain extent.

Fig. 7 is a schematic flow chart of a method of HARQ feedback provided by another embodiment of the present application. The embodiment shown in fig. 7 describes in more detail an example in which the network device mentioned in S310 may instruct the transmission of the second scheduling resources of the first downlink data by transmitting the second scheduling signaling to the terminal device. As shown in FIG. 7, the method 700 may include S710-S750, with the various steps described below.

And S710, the network equipment sends a second scheduling signaling to the terminal equipment.

The second scheduling signaling indicates a second transmission resource, the second transmission resource is used for transmitting first downlink data, the first downlink data is broadcast multicast data, and the second scheduling signaling is broadcast scheduling signaling or multicast scheduling signaling.

The second scheduling signaling may also indicate a HARQ feedback channel that broadcasts the multicast data.

It should be appreciated that every time the network device sends a second scheduling signaling, the DAI counter is incremented by 1 by default. The default plus 1 may be understood that the second scheduling signaling sent by the network device does not carry the DAI, but only the unicast scheduling signaling sent this time is assumed to be counted.

As shown in fig. 8, unicast scheduling signaling #1 received by the terminal device in time slot n indicates unicast PDSCH1, and corresponding dai=0 indicates HARQ feedback information to be sent in time slot n+8; unicast scheduling signaling #2 received by the terminal equipment in time slot n+2 indicates unicast PDSCH2, corresponding dai=1, and indicates HARQ feedback information to be sent in time slot n+8; the broadcast multicast scheduling signaling received by the terminal device in time slot n+3 indicates broadcast multicast PDSCHx, does not involve unicast DAI counter, but skips dai=2; unicast scheduling signaling #4 received by the terminal device in time slot n+6 indicates unicast PDSCH4, and corresponding dai=3 indicates HARQ feedback information to be sent in time slot n+8. The network device sends unicast scheduling signaling on the unicast PDCCH, and sends broadcast multicast scheduling signaling on the broadcast multicast PDCCH.

The terminal device orders the received plurality of second scheduling signaling over the time slots. For example, the ordered sequence information is: slot-y= { slot-y1}, { slot-y2}, … …, { slot-yM }. M is the number of second scheduling signaling received by the terminal equipment, and M is a positive integer. { slot-y1} indicates that the terminal device received the first second scheduling signaling in time slot y1, { slot-y2} indicates that the terminal device received the second scheduling signaling in time slot y2, and so on.

It should be appreciated that the end time of the second transmission resource indicated by the second scheduling signaling is before the terminal device sends d symbols of the HARQ codebook carrying HARQ feedback information. d symbols represent the time when the terminal device demodulates the first downlink data, i.e. within d symbols, the terminal device can demodulate and decode the first downlink data and perform HARQ feedback. The value of d is set based on the processing time of each terminal device.

S720, the network device sends the first downlink data to the terminal device.

The network device sends the first downlink data to the terminal device on the second transmission resource.

And S730, the network device sends a third scheduling signaling to the terminal device.

The third scheduling signaling indicates a third transmission resource, the third transmission resource is used for transmitting second downlink data, the second downlink data is unicast downlink data, and the third scheduling signaling is unicast scheduling signaling.

It should be appreciated that for each third scheduling signaling sent by the network device, the DAI counter is also incremented by 1.

The terminal device orders the received plurality of third scheduling signaling over the time slots. For example, the ordered sequence information is: slot (slot) -x= { slot-x1, DAI-x1}, { slot-x2, DAI-x2}, … …, { slot-xN, DAI-xN }. N is the number of the third scheduling signaling received by the terminal equipment, and N is a positive integer. slot-x1 indicates that the terminal device receives the first third scheduling signaling in time slot x1, the value of the corresponding DAI is DAI-x1, slot-x2 indicates that the terminal device receives the second third scheduling signaling in time slot x2, the value of the corresponding DAI is DAI-x2, and so on.

It is necessary to explain that: s710 and S730 have no specific time relationship, and may be performed first S710 and then S730, or performed first S730 and then S710, or performed S710, S730 and then S710.

And S740, the network equipment sends the second downlink data to the terminal equipment.

And the network equipment sends the second downlink data to the terminal equipment on the third transmission resource.

S750, the terminal equipment sends HARQ feedback information of the first downlink data and the second downlink data to the network equipment.

First, the terminal device arranges the sequence information slot-y and slot-x in the time sequence of the slots in S710 and S730.

It will be appreciated that after the sequence information slot-y and slot-x are arranged in time sequence of the time slot, the sequence information slot-y may precede slot-x, may be between slots-x, or may follow slot-x.

For example, after the sequence information slot-y and slot-x are arranged according to the time sequence of the time slot, the obtained sequence information may be: { slot-y1}, { slot-y2}, … …, { slot-yM }, { slot-x1}, { slot-x2}, … …, { slot-xN }.

In this case, if the DAI-x1 value of the third scheduling signaling received by the terminal device in the time slot x1 is equal to M, it indicates that all the second scheduling signaling sent by the network device before the time slot x1 is detected. The information combination of HARQ feedback is: { slot-y1}, { slot-y2}, … …, { slot-yM }, { slot-x1}, { slot-x2}, … …, { slot-xN } sequence corresponds to the decoding result of downlink data sent on the transmission resource indicated by the scheduling signaling.

If the DAI-x1 value of the third scheduling signaling received by the terminal device in the time slot x1 is not equal to M, for example, the DAI-x1 value is smaller than M, which indicates that some second scheduling signaling sent by the network device before the time slot x1 is not detected, the DAI-x1-1 NACKs are set before the decoding result corresponding to { slot-x1 }.

As shown in fig. 9, the broadcast multicast scheduling signaling #1 received by the terminal device in the time slot n indicates broadcast multicast PDSCHy; the broadcast multicast scheduling signaling #2 received by the terminal equipment in the time slot n+1 indicates broadcast multicast PDSCHy+1; unicast scheduling signaling #1 received by the terminal device in time slot n+6 indicates unicast PDSCH1, corresponding dai=3, and indicates HARQ feedback information to be sent in time slot n+8. The network device sends unicast scheduling signaling on the unicast PDCCH, and sends broadcast multicast scheduling signaling on the broadcast multicast PDCCH.

Dai=3 corresponding to the unicast scheduling signaling #1 received by the terminal device, so that it can be determined that three unicast scheduling signaling may be lost before the unicast scheduling signaling # 1. Meanwhile, the number of broadcast schedule signaling received by the terminal device is 2, and the time slot in which the broadcast schedule signaling is located is before the time slot in which the unicast schedule signaling #1 is located, the terminal device may determine that the two received broadcast schedule signaling corresponds to two DAIs in dai=0, 1, 2. However, since 3 is not equal to 2, it can be determined that the terminal device has missed one scheduling signaling. And because the terminal equipment cannot judge whether the missed detection is unicast scheduling signaling or broadcast multicast scheduling signaling, 3 NACK are set before the decoding result of unicast data. As shown in fig. 9, the information combination of HARQ feedback sent by the terminal device to the network device is: NACK, NACK, NACK, HARQ-1, wherein HARQ-1 is the decoding result corresponding to unicast data.

For another example, after the sequence information slot-y and slot-x are arranged according to the time sequence of the time slot, the obtained sequence information may be: { slot-x1}, … …, { slot-xN-1}, { slot-y1}, { slot-y2}, … …, { slot-yM }, and { slot-xN }.

Let the DAI value of the third scheduling signaling received by the terminal device in the time slot xN-1 be A, and let the DAI value of the third scheduling signaling received by the terminal device in the time slot xN be B. If B-ase:Sub>A-1=m, it indicates that all second scheduling signaling sent by the network device between the time slot xN-1 and the time slot xN is detected, where M is the number of second scheduling signaling received by the terminal device, and M is ase:Sub>A positive integer. The information combination of HARQ feedback is: { slot-x1}, … …, { slot-xN-1}, { slot-y1}, { slot-y2}, … …, { slot-yM }, and { decoding result of downlink data sent on transmission resources indicated by scheduling signaling corresponding to the slot-xN } sequence.

As shown in fig. 8, unicast scheduling signaling #2 received by the terminal device in time slot n+2 indicates unicast PDSCH2, corresponding dai=1, unicast scheduling signaling #4 received by the terminal device in time slot n+6 indicates unicast PDSCH4, corresponding dai=3, and the number of broadcast multicast scheduling signaling received by the terminal device is 1. Since 3-1-1=1, it can be determined that the terminal device has received all the scheduling signaling sent by the network device, and the information combination of HARQ feedback is: HARQ-1, HARQ-2, HARQ-x, HARQ-4.

If B-A-1 is not equal to M, it indicates that some second scheduling signaling sent by the network device between the time slot xN-1 and the time slot xN is not detected, and B-A-1 NACKs are set between the decoding results corresponding to { slot-xN-1} and { slot-xN }.

As shown in fig. 10, unicast scheduling signaling #1 received by the terminal device in time slot n indicates unicast PDSCH1, and corresponding dai=0 indicates HARQ feedback information to be sent in time slot n+8; unicast scheduling signaling #2 received by the terminal equipment in time slot n+1 indicates unicast PDSCH2, corresponding dai=1, and indicates HARQ feedback information to be sent in time slot n+8; the broadcast multicast scheduling signaling received by the terminal device in time slot n+3 indicates broadcast multicast PDSCHx, does not involve unicast DAI counter, but skips dai=3; unicast scheduling signaling #4 received by the terminal device in time slot n+6 indicates unicast PDSCH4, and corresponding dai=4 indicates HARQ feedback information to be sent in time slot n+8. The network device sends unicast scheduling signaling on the unicast PDCCH, and sends broadcast multicast scheduling signaling on the broadcast multicast PDCCH.

One broadcast scheduling signaling received by the terminal device is between unicast scheduling signaling #2 and unicast scheduling signaling #4, and the terminal device does not receive unicast scheduling signaling #3. Dai=1 for unicast scheduling signaling #2 and dai=4 for unicast scheduling signaling # 4. Since 4-1-1+.1, then a certain scheduling signaling sent by the end device network device between time slot n+1 and time slot n+6 is not detected. Since the terminal device cannot determine whether the missed detection is the broadcast multicast scheduling signaling or the unicast scheduling signaling #3, two NACKs are set between the decoding result of the unicast data #2 received in the time slot n+1 and the decoding result of the unicast data #4 received in the time slot n+6. As shown in fig. 10, the information combination of HARQ feedback sent by the terminal device to the network device is: HARQ-1, HARQ-2, nack, HARQ-4, where HARQ-1 is the decoding result corresponding to unicast data #1, HARQ-2 is the decoding result corresponding to unicast data #2, and HARQ-4 is the decoding result corresponding to unicast data # 4.

For another example, after the sequence information slot-y and slot-x are arranged according to the time sequence of the time slot, the obtained sequence information may be: { slot-x1}, … …, { slot-xN }, { slot-y1}, { slot-y2}, … …, { slot-yM }.

In this case, the terminal device cannot determine whether all broadcast multicast scheduling signaling sent by the network device is received, and HARQ feedback is not performed on the first downlink data.

In this embodiment of the present application, the network device indicates, by sending a broadcast scheduling signaling or a multicast scheduling signaling to the terminal device, a transmission resource for transmitting broadcast multicast data, and the DAI counter is incremented by 1 every time a broadcast scheduling signaling or a multicast scheduling signaling is sent. Therefore, the HARQ feedback information of the broadcast multicast data can be sent on the unicast feedback channel, and simultaneously, the air interface signaling for the network equipment to send the scheduling signaling is saved.

The method provided in the embodiment of the present application is described in detail above with reference to fig. 2 to 9. The following describes in detail the apparatus provided in the embodiments of the present application with reference to fig. 11 to 13.

Fig. 11 is a schematic block diagram of a communication device provided in an embodiment of the present application. As shown in fig. 11, the communication apparatus 1000 may include a processing unit 1100 and a transceiving unit 1200.

In one possible design, the communication device 1000 may correspond to the terminal device in the above method embodiment, for example, may be a terminal device, or a component (such as a chip or a chip system) configured in the terminal device.

It is understood that the communication apparatus 1000 may correspond to the terminal device in the methods 300, 500, 700 according to embodiments of the present application, and the communication apparatus 1000 may include units for performing the methods 300, 500, 700 in fig. 3, 5, and 7. And, each unit in the communication device 1000 and the other operations and/or functions described above are respectively for implementing the corresponding flows of the method 300 in fig. 3, the method 500 in fig. 5, and the method 700 in fig. 7.

When the communication device 1000 is used to perform the method 300 in fig. 3, the processing unit 1100 may be used to perform S320 in the method 300, and the transceiver unit 1200 may be used to perform S310 and S320 in the method 300. It should be understood that the specific process of each unit performing the corresponding steps has been described in detail in the above method embodiments, and is not described herein for brevity.

When the communication device 1000 is used to perform the method 500 in fig. 5, the processing unit 1100 may be used to perform S540, S550 in the method 500, and the transceiver unit 1200 may be used to perform S510-S550 in the method 500. It should be understood that the specific process of each unit performing the corresponding steps has been described in detail in the above method embodiments, and is not described herein for brevity.

When the communication device 1000 is used to perform the method 700 in fig. 7, the processing unit 1100 may be used to perform S750 in the method 700, and the transceiver unit 1200 may be used to perform S710-S750 in the method 700. It should be understood that the specific process of each unit performing the corresponding steps has been described in detail in the above method embodiments, and is not described herein for brevity.

It should also be understood that when the communication apparatus 1000 is a terminal device, the transceiver unit 1200 in the communication apparatus 1000 may be implemented by a transceiver, for example, may correspond to the transceiver 2020 in the terminal device 2000 shown in fig. 12, and the processing unit 1100 in the communication apparatus 1000 may be implemented by at least one processor, for example, may correspond to the processor 2010 in the terminal device 2000 shown in fig. 12.

It should be further understood that, when the communication device 1000 is a chip or a chip system configured in a terminal device, the transceiver unit 1200 in the communication device 1000 may be implemented through an input/output interface, and the processing unit 1100 in the communication device 1000 may be implemented through a processor, a microprocessor, an integrated circuit, or the like integrated on the chip or the chip system.

In another possible design, the communication apparatus 1000 may correspond to the network device in the above method embodiment, for example, may be a network device, or a component (such as a chip or a chip system) configured in the network device.

It is to be understood that the communication apparatus 1000 may correspond to the network device in the methods 300, 500, 700 according to embodiments of the present application, and that the communication apparatus 1000 may include means for performing the method 300 in fig. 3, the method 500 in fig. 5, the method performed by the network device in the method 700 in fig. 7. And, each unit in the communication device 1000 and the other operations and/or functions described above are respectively for implementing the corresponding flows of the method 300 in fig. 3, the method 500 in fig. 5, and the method 700 in fig. 7.

When the communication device 1000 is used to perform the method 300 of fig. 3, the transceiver unit 1200 may be used to perform S310-S320 of the method 300. It should be understood that the specific process of each unit performing the corresponding steps has been described in detail in the above method embodiments, and is not described herein for brevity.

When the communication device 1000 is used to perform the method 500 in fig. 5, the processing unit 1100 may be used to perform S530-S540 in the method 500, and the transceiver unit 1200 may be used to perform S510-S550 in the method 500. It should be understood that the specific process of each unit performing the corresponding steps has been described in detail in the above method embodiments, and is not described herein for brevity.

When the communication device 1000 is used to perform the method 700 in fig. 7, the processing unit 1100 may be used to perform S710 and S730 in the method 700, and the transceiver unit 1200 may be used to perform S710-S750 in the method 700. It should be understood that the specific process of each unit performing the corresponding steps has been described in detail in the above method embodiments, and is not described herein for brevity.

It should also be understood that when the communication apparatus 1000 is a network device, the transceiver unit 1200 in the communication apparatus 1000 may be implemented by a transceiver, for example, may correspond to the BBU3200 in the network device 3000 shown in fig. 13, and the processing unit 1100 in the communication apparatus 1000 may be implemented by at least one processor, for example, may correspond to the RRU3100 in the network device 3000 shown in fig. 13.

It should also be understood that, when the communication apparatus 1000 is a chip or a chip system configured in a network device, the transceiver unit 1200 in the communication apparatus 1000 may be implemented through an input/output interface, and the processing unit 1100 in the communication apparatus 1000 may be implemented through a processor, a microprocessor, an integrated circuit, or the like integrated on the chip or the chip system.

Fig. 12 is a schematic structural diagram of a terminal device 2000 provided in an embodiment of the present application. The terminal device 2000 may be applied to a system as shown in fig. 1, and perform the functions of the terminal device in the above-described method embodiment. As shown, the terminal device 2000 includes a processor 2010 and a transceiver 2020. Optionally, the terminal device 2000 further comprises a memory 2030. Wherein the processor 2010, the transceiver 2020 and the memory 2030 may communicate with each other via an internal connection path, transferring control and/or data signals, the memory 2030 is used for storing a computer program, and the processor 2010 is used for calling and running the computer program from the memory 2030 to control the transceiver 2020 to transceive signals. Optionally, the terminal device 2000 may further include an antenna 2040 for transmitting uplink data and uplink control signaling output by the transceiver 2020 through a wireless signal.

The processor 2010 and the memory 2030 may be combined into a single processing device, and the processor 2010 is configured to execute program codes stored in the memory 2030 to implement the functions described above. In particular implementations, the memory 2030 may also be integrated within the processor 2010 or separate from the processor 2010. The processor 2010 may correspond to the processing unit 1100 of fig. 11.

The transceiver 2020 may correspond to the transceiver unit 1200 in fig. 11, and may also be referred to as a transceiver unit. The transceiver 2020 may include a receiver (or receiver, receiving circuitry) and a transmitter (or transmitter, transmitting circuitry). Wherein the receiver is for receiving signals and the transmitter is for transmitting signals.

It should be understood that the terminal device 2000 shown in fig. 12 is capable of implementing the various processes involving the terminal device in the method embodiments shown in fig. 3, 5 and 7. The operations and/or functions of the respective modules in the terminal device 2000 are respectively for implementing the corresponding flows in the above-described method embodiment. Reference is specifically made to the description in the above method embodiments, and detailed descriptions are omitted here as appropriate to avoid repetition.

The above-mentioned processor 2010 may be used to perform the actions described in the previous method embodiments as being implemented internally by the terminal device, such as determining the first scheduling signaling, etc. The transceiver 2020 may be configured to perform actions described in the foregoing method embodiments that the terminal device transmits to or receives from the network device, such as transmitting HARQ feedback information for the first downlink data, receiving the first downlink data, etc. Please refer to the description of the foregoing method embodiments, and details are not repeated herein.

The terminal device 2000 may further include a power supply 2050 for providing power to various devices or circuits in the terminal device.

In addition, in order to make the functions of the terminal device more complete, the terminal device 2000 may further include one or more of an input unit 2060, a display unit 2070, an audio circuit 2080, a camera 2090, a sensor 2100, and the like, and the audio circuit may further include a speaker 2082, a microphone 2084, and the like.

Fig. 13 is a schematic structural diagram of a network device provided in the embodiment of the present application, for example, may be a schematic structural diagram of a base station. The base station 3000 may be applied to the system shown in fig. 1, and perform the functions of the network device in the above method embodiment. As shown, the base station 3000 may include one or more radio frequency units, such as a remote radio frequency unit (remote radio unit, RRU) 3100 and one or more baseband units (BBUs) (also referred to as Distributed Units (DUs)) 3200. The RRU 3100 may be referred to as a transceiver unit or a part of a transceiver unit, corresponding to the transceiver unit 1200 in fig. 11. Alternatively, the transceiver unit 3100 may also be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 3101 and a radio frequency unit 3102. Alternatively, the transceiving unit 3100 may include a receiving unit, which may correspond to a receiver (or receiver, receiving circuit), and a transmitting unit, which may correspond to a transmitter (or transmitter, transmitting circuit). The RRU 3100 is mainly configured to receive and transmit a radio frequency signal and convert the radio frequency signal to a baseband signal, for example, send first downlink data, second downlink data, HARQ feedback information, and the like to a terminal device. Please refer to the description of the foregoing method embodiments, and details are not repeated herein.

The BBU 3200 portion is mainly used for performing baseband processing, controlling a base station, and the like. The RRU 3100 and BBU 3200 may be physically disposed together, or may be physically disposed separately, i.e. a distributed base station.

The BBU 3200 is a control center of a base station, and may also be referred to as a processing unit, and may correspond to the processing unit 1100 in fig. 11, and may be configured to perform baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and so on. For example, the BBU (processing unit) may be configured to control the base station to perform the operation procedure with respect to the network device in the above-described method embodiment, for example, generate the above-described resource allocation information, etc. Please refer to the description of the foregoing method embodiments, and details are not repeated herein.

In one example, the BBU 3200 may be configured by one or more single boards, where the multiple single boards may support a single access radio access network (such as an LTE network) together, or may support radio access networks of different access systems (such as an LTE network, a 5G network, or other networks) respectively. The BBU 3200 also includes a memory 3201 and a processor 3202. The memory 3201 is used to store necessary instructions and data. The processor 3202 is configured to control the base station to perform necessary actions, for example, to control the base station to perform the operation procedure related to the network device in the above method embodiment. The memory 3201 and processor 3202 may serve one or more boards. That is, the memory and the processor may be separately provided on each board. It is also possible that multiple boards share the same memory and processor. In addition, each single board can be provided with necessary circuits.

It should be understood that the base station 3000 shown in fig. 13 is capable of implementing various processes involving network devices in the method embodiments shown in fig. 3, 5 and 7. The operations and/or functions of the respective modules in the base station 3000 are respectively for implementing the corresponding flows in the above-described method embodiments. Reference is specifically made to the description in the above method embodiments, and detailed descriptions are omitted here as appropriate to avoid repetition.

The BBU 3200 described above may be used to perform actions described in the foregoing method embodiments as being implemented internally by a network device, while the RRU 3100 may be used to perform actions described in the foregoing method embodiments as being transmitted to or received from a terminal device by the network device. Please refer to the description of the foregoing method embodiments, and details are not repeated herein.

It should be understood that the base station 3000 shown in fig. 13 is only one possible configuration of a network device, and should not be construed as limiting the present application in any way. The method provided by the application can be applied to network equipment in other forms. For example, including AAUs, but also CUs and/or DUs, or BBUs and adaptive radio units (adaptive radio unit, ARUs), or BBUs; the network device may be a customer premise equipment (customer premises equipment, CPE), or may be in other forms, and the specific form of the network device is not limited in the present application.

Wherein the CU and/or the DU may be used to perform the actions described in the previous method embodiments as being implemented internally by the network device, and the AAU may be used to perform the actions described in the previous method embodiments as being sent to or received from the first terminal device by the network device. Please refer to the description of the foregoing method embodiments, and details are not repeated herein.

The embodiment of the application also provides a processing device, which comprises a processor and an interface; the processor is configured to perform the method of any of the method embodiments described above.

It should be understood that the processing means described above may be one or more chips. For example, the processing device may be a field programmable gate array (field programmable gate array, FPGA), an application specific integrated chip (application specific integrated circuit, ASIC), a system on chip (SoC), a central processing unit (central processor unit, CPU), a network processor (network processor, NP), a digital signal processing circuit (digital signal processor, DSP), a microcontroller (micro controller unit, MCU), a programmable controller (programmable logic device, PLD) or other integrated chip.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in the processor for execution. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method. To avoid repetition, a detailed description is not provided herein.

It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip with signal processing capability. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, or discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

It will be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

According to the method provided by the embodiment of the application, the application further provides a computer program product, which comprises: computer program code which, when run on a computer, causes the computer to perform the methods performed by the terminal device and the network device respectively in the embodiments shown in fig. 3, 5 and 7.

According to the method provided in the embodiments of the present application, there is further provided a computer readable medium storing a program code, which when executed on a computer, causes the computer to perform the methods performed by the terminal device and the network device in the embodiments shown in fig. 3, fig. 5, and fig. 7, respectively.

According to the method provided by the embodiment of the application, the application further provides a system, which comprises the one or more terminal devices and the one or more network devices.

The network device in the above-mentioned respective apparatus embodiments corresponds entirely to the network device or the terminal device in the terminal device and method embodiments, the respective steps are performed by respective modules or units, for example, the steps of receiving or transmitting in the method embodiments are performed by the communication unit (transceiver), and other steps than transmitting and receiving may be performed by the processing unit (processor). Reference may be made to corresponding method embodiments for the function of a specific unit. Wherein the processor may be one or more.

As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components may reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between 2 or more computers. Furthermore, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with one another in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).

Those of ordinary skill in the art will appreciate that the various illustrative logical blocks (illustrative logical block) and steps (steps) described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

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

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

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

In the above-described embodiments, the functions of the respective functional units may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, 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 (programs). When the computer program instructions (program) are loaded and executed on a computer, the processes or functions described in accordance with the embodiments of the present application are fully or partially produced. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for hybrid automatic repeat request, HARQ, feedback, comprising:

receiving first downlink data, wherein the first downlink data is broadcast multicast data;

transmitting HARQ feedback information of the first downlink data on a unicast feedback channel;

receiving a first scheduling signaling, wherein the first scheduling signaling indicates a first scheduling resource, the first scheduling resource is a transmission resource of the first downlink data, and the first scheduling signaling is a unicast scheduling signaling;

wherein receiving the first downlink data comprises:

receiving the first downlink data on the first scheduling resource;

the receiving the first scheduling signaling includes:

determining the first scheduling signaling according to a first Radio Network Temporary Identifier (RNTI), wherein the first RNTI is associated with a second RNTI, the first RNTI is a unicast RNTI, and the second RNTI is a broadcast multicast RNTI;

the receiving the first downlink data includes:

and determining the first downlink data according to the second RNTI.

2. The method of claim 1, wherein the method further comprises:

and receiving configuration information, wherein the configuration information comprises the first RNTI or the first RNTI and the second RNTI.

3. The method of claim 1, wherein the first scheduling signaling further comprises first indication information indicating transmission of the first downlink data on the first scheduling resource.

4. The method of claim 1, wherein the receiving the first scheduling signaling comprises:

detecting a first scheduling channel in a predefined search space;

the first scheduling signaling is received on the first scheduling channel.

5. The method of claim 4, wherein detecting the first scheduling channel in a predefined search space comprises:

determining the predefined search space according to a predefined set of control resources;

the first scheduling channel is detected in the predefined search space.

6. The method of claim 1, wherein the method further comprises:

receiving a second scheduling signaling, wherein the second scheduling signaling indicates a second scheduling resource, the second scheduling resource is a transmission resource of the first downlink data, and the second scheduling signaling is a broadcast scheduling signaling or a multicast scheduling signaling;

wherein receiving the first downlink data comprises:

Receiving the first downlink data on the second scheduling resource;

wherein sending the HARQ feedback information of the first downlink data on a unicast feedback channel includes:

and transmitting HARQ feedback information of the first downlink data according to the sequence of the second scheduling signaling on a time unit on the unicast feedback channel.

7. The method of claim 6, wherein the method further comprises:

receiving a third scheduling signaling and a downlink allocation index DAI corresponding to the third scheduling signaling, wherein the third scheduling signaling indicates a third scheduling resource, the third scheduling resource is a transmission resource of second downlink data, the second downlink data is unicast data, the third scheduling signaling is unicast scheduling signaling, and the DAI counts the scheduling signaling in an accumulated manner according to the sequence of sending the second scheduling signaling and the third scheduling signaling;

wherein transmitting the HARQ feedback information of the first downlink data on the unicast feedback channel according to the ordering of the second scheduling signaling on the time unit includes:

and transmitting HARQ feedback information of the first downlink data on the unicast feedback channel according to the ordering of the second scheduling signaling and the third scheduling signaling on a time unit and the value of the DAI.

8. A method for hybrid automatic repeat request, HARQ, feedback, comprising:

transmitting the first downlink data in a broadcast or multicast mode;

receiving HARQ feedback information of the first downlink data from a first terminal device on a unicast feedback channel of the first terminal device;

transmitting a first scheduling signaling to the first terminal equipment in a unicast mode, wherein the first scheduling signaling indicates a first scheduling resource, and the first scheduling resource is a transmission resource of the first downlink data;

wherein, the first downlink data is sent in a broadcast or multicast mode, which comprises the following steps:

transmitting the first downlink data in a broadcast or multicast mode on the first scheduling resource;

the unicast transmission of the first scheduling signaling to the first terminal device includes:

scrambling the first scheduling signaling by adopting a first Radio Network Temporary Identifier (RNTI), wherein the first RNTI is associated with a second RNTI, the first RNTI is a unicast RNTI, and the second RNTI is a broadcast multicast RNTI;

transmitting the first scheduling signaling to the first terminal device in a unicast mode;

the sending the first downlink data in a broadcast or multicast mode comprises the following steps:

Scrambling the first downlink data with the second RNTI;

the first downlink data is transmitted in a broadcast or multicast manner.

9. The method of claim 8, wherein the method further comprises:

and sending configuration information to the first terminal equipment, wherein the configuration information comprises the first RNTI or the first RNTI and the second RNTI.

10. The method of claim 8, wherein the first scheduling signaling further comprises first indication information indicating transmission of the first downlink data on the first scheduling resource.

11. The method of claim 8, wherein the unicast transmitting the first scheduling signaling to the first terminal device comprises:

the first scheduling signaling is sent unicast to the first terminal device on a first scheduling channel, which is detected in a predefined search space.

12. The method of claim 11, wherein the predefined search space is determined from a predefined set of control resources.

13. The method of claim 8, wherein the method further comprises:

Transmitting a second scheduling signaling in a broadcast or multicast mode, wherein the second scheduling signaling indicates a second scheduling resource, and the second scheduling resource is a transmission resource of the first downlink data;

and transmitting the first downlink data in a broadcast or multicast mode on the second scheduling resource.

14. The method of claim 13, wherein the method further comprises:

transmitting a third scheduling signaling and a downlink allocation index DAI corresponding to the third scheduling signaling to the first terminal equipment in a unicast mode, wherein the third scheduling signaling indicates a third scheduling resource, the third scheduling resource is a transmission resource of second downlink data, the second downlink data is unicast data, the third scheduling signaling is unicast scheduling signaling, and the DAI counts the scheduling signaling in an accumulated manner according to the sequence of transmitting the second scheduling signaling and the third scheduling signaling.

15. A communication device is characterized by comprising a processing unit and a receiving and transmitting unit,

the receiving and transmitting unit is used for: receiving first downlink data, wherein the first downlink data is broadcast multicast data;

The transceiver unit is further configured to: transmitting HARQ feedback information of the first downlink data on a unicast feedback channel;

the receiving and transmitting unit is specifically configured to: receiving the first downlink data on the first scheduling resource;

the receiving and transmitting unit is specifically configured to:

the receiving and transmitting unit is specifically configured to: and determining the first downlink data according to the second RNTI.

16. The communication device of claim 15, wherein the transceiver unit is further configured to:

17. The communications apparatus of claim 15, wherein the first scheduling signaling further comprises first indication information indicating transmission of the first downlink data on the first scheduling resource.

18. The communications apparatus of claim 15, wherein the processing unit is configured to:

detecting a first scheduling channel in a predefined search space;

the receiving and transmitting unit is specifically configured to: the first scheduling signaling is received on the first scheduling channel.

19. The communication device according to claim 18, wherein the processing unit is specifically configured to:

the first scheduling channel is detected in the predefined search space.

20. The communication device of claim 15, wherein the transceiver unit is further configured to:

the receiving and transmitting unit is specifically configured to:

receiving the first downlink data on the second scheduling resource;

the receiving and transmitting unit is specifically configured to:

21. The communication device of claim 20, wherein the transceiver unit is further configured to:

the receiving and transmitting unit is specifically configured to:

22. A communication device is characterized by comprising a processing unit and a receiving and transmitting unit,

the receiving and transmitting unit is used for: transmitting the first downlink data in a broadcast or multicast mode;

the transceiver unit is further configured to: receiving HARQ feedback information of the first downlink data from a first terminal device on a unicast feedback channel of the first terminal device;

the receiving and transmitting unit is specifically configured to:

the processing unit is used for:

the transceiver unit is further configured to: receiving the first scheduling signaling;

the processing unit is further configured to: scrambling the first downlink data with the second RNTI;

the transceiver unit is further configured to: and receiving the first downlink data.

23. The communication device of claim 22, wherein the transceiver unit is further configured to:

24. The communications apparatus of claim 22, wherein the first scheduling signaling further comprises first indication information indicating transmission of the first downlink data on the first scheduling resource.

25. The communication device of claim 22, wherein the transceiver unit is specifically configured to:

26. The communications apparatus of claim 25, wherein the predefined search space is determined from a predefined set of control resources.

27. The communication device of claim 22, wherein the transceiver unit is further configured to:

the receiving and transmitting unit is specifically configured to:

28. The communication device of claim 27, wherein the transceiver unit is further configured to:

29. A communication device, comprising:

a processor for executing computer instructions stored in a memory to cause the apparatus to perform: the method of any one of claims 1-7.

30. A communication device, comprising:

a processor for executing computer instructions stored in a memory to cause the apparatus to perform: the method of any one of claims 8-14.

31. A computer readable storage medium, characterized in that a computer program is stored thereon, which computer program, when executed, is caused to perform the method of any of claims 1-14.