WO2020143731A1

WO2020143731A1 - Method for transmitting data, communication device and network device

Info

Publication number: WO2020143731A1
Application number: PCT/CN2020/071287
Authority: WO
Inventors: 张锦芳; 苏宏家; 向铮铮
Original assignee: 华为技术有限公司
Priority date: 2019-01-11
Filing date: 2020-01-10
Publication date: 2020-07-16
Also published as: CN111435885A; CN111435885B

Abstract

Provided are a method for transmitting data, a communication device and a network device, wherein same can be applied to the Internet of Vehicles, such as NR V2X, LTE-V and DSRC. In the technical solution of the present application, a network device configures transmission parameters, such as the maximum number of retransmissions and a retransmission time interval, for sidelink communication, and schedules time-frequency resources of sidelink transmission by means of sidelink scheduling information; a communication device on a sending side feeds back ACK to the network device when the sidelink transmission is correct, such that the network device releases reserved retransmission time-frequency resources in a timely manner; and when the sidelink transmission fails, the communication device on the sending side realizes fast sidelink retransmission using the reserved retransmission time-frequency resources. By means of the technical solution above, sidelink transmission delay can be reduced, and the resource utilization rate can be improved.

Description

Method for transmitting data, communication equipment and network equipment

This application requires the priority of the Chinese patent application submitted to the China Patent Office on January 11, 2019, with the application number of 201910028388.9 and the application name of "method for transmitting data, communication equipment and network equipment", the entire content of which is cited by reference Incorporated in this application.

Technical field

The present application relates to the field of communication, and more specifically to a method for transmitting data, a communication device, and a network device.

Background technique

In the 3rd Generation Partnership Project (3GPP), the Internet of Vehicles technology based on cellular network is proposed, which connects cars through a vehicle-to-everything (V2X) communication system. Vehicle-to-vehicle (V2V), vehicle-to-people (V2P), vehicle-to-infrastructure (V2I) and vehicle-to-network (V2N) intelligent transportation services. Except for V2N vehicle and network communications that use uplinks and downlinks, the rest of V2V, V2I, and V2P data communications use side links for communications. The side link (sidelink, SL) is defined for direct communication between the communication device and the communication device, that is, the communication device and the communication device communicate directly without forwarding through the network device. The communication device here may be a vehicle-mounted communication module or a communication terminal, a handheld communication terminal or a roadside unit (RSU).

Sidelink communication includes two communication modes. The first communication mode is based on the side communication scheduled by the network device. The communication device sends the side communication control message and data on the scheduled time-frequency resource according to the side scheduling information of the network device, which is called the scheduled transmission mode; The two communication modes are that the communication device selects the time-frequency resources used for communication among the available time-frequency resources included in the side communication resources, and sends control messages and data on the selected time-frequency resources, which is called a non-scheduled transmission mode.

The flow of the scheduling transmission mode in LTE V2X is shown in Figure 1. The sending-end communication device 1 sends a scheduling request (scheduling request (SR) or buffer status report (BSR) to the network device, requesting the network device to allocate resources for side transmission; the network device allocating resources for side transmission; the network device The time-frequency resource of the scheduled side transmission is delivered to the communication device 1; the communication device 1 sends the side user data to the receiver communication device 2 on the assigned side transmission resource. The communication device 1 may send one or more times for a data packet on the side link. For example, the definition in LTE V2X can support sending a data packet twice at most. At this time, the network device may schedule and allocate time-frequency resources for multiple side transmissions at a time. For example, as shown in FIG. 1, the network device schedules time-frequency resources for the communication device 1 to be repeatedly transmitted twice. Since LTE V2X does not define a feedback mechanism, neither the network device nor the communication device 1 know whether the sideline is correctly transmitted, and the network device releases the scheduled time-frequency resources after the two transmissions are completed.

LTE V2X only defines the broadcast transmission on the side link, and NR V2X also introduces unicast and multicast transmission on the side link. The 3GPP standard defines a physical layer sidelink feedback channel (PSFCH) on the sidelink, which is mainly used to receive confirmation messages from the UE to the sending UE whether the reception was successful or not.

For the scheduled transmission mode, the network device does not know whether the sideline transmission is correct, and only releases the scheduled resources when the sideline transmission reaches the maximum number of retransmissions, and the resource utilization rate is low.

Summary of the invention

This application provides a method for transmitting data, a communication device, and a network device, which can improve the utilization rate of resources.

In a first aspect, the present application provides a method for transmitting data. The method includes: a first communication device obtains a retransmission interval and a maximum number of retransmissions; the first communication device receives downlink control information from a network device, The downlink control information includes side scheduling information, which indicates uplink control channel resources and time-frequency resources for initial transmission of data packets; the first communication device according to the retransmission interval and the maximum number of retransmissions And the side schedule information, to determine the time-frequency resource for retransmitting the data packet; the first communication device communicates with N second communications on the time-frequency resource for initial transmission and/or retransmission of the data packet The device sends the data packet, and N is a positive integer; when the first communication device determines that the data packet fails to be sent, the first communication device retransmits the data packet on the time-frequency resource used to retransmit the data packet A data packet; or, if the first communication device determines that the data packet is successfully sent, the first communication device sends confirmation information ACK to the network device on the uplink control channel resource, the ACK indicates that the data packet was successfully sent .

In the above technical solution, the first communication device is used as an end for sending a data packet, and when it is determined that the first communication device successfully transmits the data packet that is initially transmitted or retransmitted to the second communication device, the first communication device sends an ACK to the network device. So that the network equipment can release the reserved retransmission time-frequency resources in time and improve the resource utilization.

In addition, the first communication device determines the time-frequency resource for retransmitting the data packet according to the time-frequency resource of the initial data packet scheduled by the network device, the time interval for retransmission, and the maximum number of retransmissions. At this time, the first communication device does not need to request the time-frequency resource of the retransmitted data packet from the network device, but directly implements fast retransmission directly on the determined time-frequency resource of the retransmitted data packet, thereby reducing the transmission delay.

Because the first communication device only sends an ACK to the network device when it is determined that the first communication device successfully transmitted the initial transmission or retransmission of the data packet to the second communication device, and the first communication device determines that the first communication device When the initial transmission or retransmission of the data packet of the communication device fails to be sent, no feedback is sent to the network device, that is, NACK is not sent, which can reduce signaling interaction between the first communication device and the network device.

In a possible implementation, the method further includes: when the first communication device determines that the data packet fails to be sent and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication The device sends indication information to the N second communication devices, where the indication information is used to indicate the end of the data packet transmission; the first communication device sends denial information NACK to the network device on the uplink control channel resource, and the NACK indicates the Failed to send the data packet.

Due to network congestion and poor channel quality, the first communication device may decide to stop retransmitting the data packet. In this case, if the network device still waits until the data packet reaches the maximum number of retransmissions or the transmission is successful before releasing resources, it will cause waste of time-frequency resources. Therefore, in this case, in the above technical solution, the first communication device sends a NACK to the network device to instruct the network device to release resources, which can improve resource utilization.

In a possible implementation manner, the N is equal to 1; the first communication device determines that the data packet is successfully sent, including: after the data packet is initially transmitted, the first communication device receives a response from the second communication device. ACK of the data packet; the first communication device determines that the data packet is successfully sent; or, after retransmitting the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device An ACK for the data packet is received from the second communication device; the first communication device determines that the data packet is successfully sent.

In the above technical solution, for the unicast mode, when the first communication device receives the ACK sent by the second communication device, it determines that the data packet is successfully sent, which can improve the reliability of data packet transmission.

In a possible implementation manner, the N is greater than 1, and the N second communication devices have the same group identifier; the first communication device determining that the data packet is successfully sent includes: after the data packet is initially transmitted, the The first communication device receives an ACK for the data packet from each of the N second communication devices; the first communication device determines that the data packet was successfully sent; or, after retransmitting the data packet and When the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device receives an ACK for the data packet from each of the N second communication devices; the first communication The device determines that the data packet is successfully sent; or, after the data packet is initially transmitted, the first communication device does not receive a NACK for the data packet from any of the N second communication devices; the first A communication device determines that the data packet is successfully sent; or, after retransmitting the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device does not communicate from the N second communications Any second communication device in the device receives a NACK for the data packet; the first communication device determines that the data packet is successfully sent.

In the above technical solution, for the multicast mode, the first communication device determines that the data packet is successfully sent when it receives ACK or NACK sent by all the second communication devices, which can improve the reliability of data packet transmission.

In a possible implementation manner, the N is equal to 1, and the first communication device determines that the data packet transmission fails, including: after the data packet is initially transmitted, the first communication device receives a response from the second communication device. NACK of the data packet; the first communication device determines that the data packet failed to be sent; or after retransmitting the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device The second communication device receives a NACK for the data packet; the first communication device determines that the data packet failed to be sent.

In the above technical solution, for the unicast mode, when the first communication device receives the NACK sent by the second communication device, it determines that the data packet transmission fails, thereby starting data packet retransmission, which can improve the reliability of data packet transmission.

In a possible implementation manner, the N is greater than 1, and the N second communication devices have the same group identifier;

The first communication device determining that the data packet has failed to send includes: after initially transmitting the data packet, the first communication device receives a NACK for the data packet from at least one of the N second communication devices The first communication device determines that the data packet failed to be sent; or after retransmitting the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device selects from the N second At least one second communication device of the communication devices receives a NACK for the data packet; the first communication device determines that the data packet fails to be sent.

In the above technical solution, for the multicast mode, when the first communication device receives a NACK sent by any second communication device, it determines that the data packet transmission fails, thereby starting the data packet retransmission, which can improve the reliability of data packet transmission .

In a possible implementation manner, the method further includes: the first communication device receives side line configuration information from the network device, where the side line configuration information is used to instruct the first communication device to apply a non-adaptive retransmission mode.

In a possible implementation, the side schedule information includes at least one of the following information: the time-frequency resource used for the initial transmission of the data packet, the time interval of the retransmission, the modulation and coding mode, the new data indication, and the hybrid automatic Retransmit the HARQ process number, multiple input multiple output MIMO mode, uplink control channel resource indication, and the first communication device identifier.

In a possible implementation manner, the method further includes: the first communication device sends a side scheduling request to the network device, where the side scheduling request is used to request the time-frequency resource for initial transmission of the data packet.

In the above technical solution, when there is a side data packet to be sent, the first communication device requests the network device for the time-frequency resource for transmitting the side data, so that the time-frequency resource can be occupied only when the data is sent, which can increase the resource Utilization.

In a second aspect, the present application provides a method for transmitting data. The method includes: a second communication device acquires an uplink control channel resource; the second communication device receives a data packet that is initially transmitted or retransmitted by the first communication device; In the case where the second communication device fails to decode the data packet, the second communication device sends a negative information NACK to the first communication device; or, in the case where the second communication device correctly decodes the data packet, the first 2. The communication device sends confirmation information ACK to the network device on the uplink control channel resource, and the ACK indicates that the data packet is successfully sent.

In the above technical solution, the second communication device serves as one end to receive the data packet. When the first communication device decodes the data packet that is initially transmitted or retransmitted to the second communication device correctly, the second communication device sends an ACK to the network device in order to The network equipment releases the reserved retransmission time-frequency resources in time to improve the resource utilization rate.

In addition, since the second communication device only sends an ACK to the network device when the first transmission or retransmission of the data packet is correctly decoded, and when the second communication device fails to decode the data packet, it does not feedback to the network device, that is, does not send NACK, This can reduce the signaling interaction between the second communication device and the network device.

In a possible implementation, the method further includes: when the second communication device fails to decode the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the second communication device Receiving indication information from the first communication device, the indication information is used to indicate the end of the data packet transmission; the second communication device sends denial information NACK to the network device on the uplink control channel resource, the NACK indicates that the data packet failed to be sent .

Due to network congestion and poor channel quality, the first communication device may decide to stop retransmitting the data packet. In this case, if the network device still waits until the data packet reaches the maximum number of retransmissions or the transmission is successful before releasing resources, it will cause waste of time-frequency resources. Therefore, in this case, after receiving the instruction information sent by the first communication device, the second communication device in the above technical solution sends a NACK to the network device to instruct the network device to release resources, which can improve resource utilization.

In a possible implementation manner, in a case where the second communication device correctly decodes the data packet, the method further includes: the second communication device sending an ACK to the first communication device.

In the above technical solution, when the data packet is correctly decoded, the second communication device also sends an ACK to the first communication device to indicate that the first communication device successfully transmitted the data packet, which can improve the reliability of the side transmission.

In a possible implementation manner, the second communication device acquiring the uplink control channel resource includes: the second communication device acquiring the uplink control channel resource from the first communication device or the network device.

In a third aspect, the present application provides a method for transmitting data. The method includes: a network device sends downlink control information, the downlink control information includes side scheduling information, and the side scheduling information indicates uplink control channel resources and usage To transmit the time-frequency resource of the data packet between the communication devices; the network device receives the ACK message sent on the uplink control channel resource; the network device releases the time-frequency of the retransmitted data packet corresponding to the time-frequency resource Resources.

In the above technical solution, when the network device receives the ACK sent by the communication device, it can release the reserved retransmission time-frequency resources without waiting for the maximum number of retransmissions, so the resource utilization rate can be improved.

In a possible implementation manner, the method further includes: the network device receiving the denial information NACK sent on the uplink control channel resource, the NACK is sent at the end of the data packet transmission; the network device releases the time frequency The time-frequency resource corresponding to the resource to retransmit the data packet.

Due to network congestion and poor channel quality, the communication device may decide to stop retransmitting data packets. In this case, if the network device still waits until the data packet reaches the maximum number of retransmissions or the transmission is successful before releasing resources, it will cause waste of time-frequency resources. Therefore, in this case, in the above technical solution, the communication device sends a NACK to the network device to instruct the network device to release resources, which can improve resource utilization.

In a possible implementation manner, the method further includes: the network device sends side configuration information, which is used to instruct the communication device to apply a non-adaptive retransmission mode for transmitting data packets.

In a possible implementation, the side configuration information further includes a retransmission interval and a maximum number of retransmissions.

In a possible implementation, the side schedule information includes at least one of the following information: the time-frequency resource used for the initial transmission of the data packet, the time interval of the retransmission, the modulation and coding mode, the new data indication, and the hybrid automatic Retransmit the HARQ process number, multiple input multiple output MIMO mode, uplink control channel resource indication, and the first communication device identification.

In a possible implementation manner, the method further includes: the network device receives a scheduling request message, where the scheduling request message is used to request the time-frequency resource used to initially transmit data packets between the communication devices.

In the above technical solution, the network device allocates resources to the communication device only when it receives the scheduling request message sent by the communication device, so that time-frequency resources can be occupied only when data is sent, and resource utilization can be improved.

In a fourth aspect, the present application provides a communication device, the communication device includes: an acquisition module for acquiring a retransmission interval and a maximum number of retransmissions; a receiving module for receiving downlink control information from a network device, the downlink The control information includes side scheduling information, which indicates uplink control channel resources and time-frequency resources used for initial transmission of data packets; a processing module is used to determine the time interval of the retransmission, the maximum number of retransmissions, and the Side scheduling information to determine the time-frequency resource for retransmitting the data packet; the sending module is used to send to the N second communication devices on the time-frequency resource for initial transmission and/or retransmission of the data packet The data packet, the N is a positive integer; the sending module is also used to retransmit the data packet on the time-frequency resource used to retransmit the data packet if the communication device determines that the data packet failed to be sent Or, if the communication device determines that the data packet is successfully sent, it sends confirmation information ACK to the network device on the uplink control channel resource, and the ACK indicates that the data packet was successfully sent.

In a possible implementation, the sending module is further configured to: when the communication device determines that the data packet fails to be sent and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, send The second communication device sends indication information, which is used to indicate the end of the data packet transmission; on the uplink control channel resource, the network device sends denial information NACK, which indicates that the data packet failed to be sent.

In a possible implementation, the N is equal to 1; the receiving module is further used to: after the data packet is initially transmitted, receive an ACK for the data packet from the second communication device; the processing module also uses To determine that the data packet is successfully sent; or, the receiving module is further configured to receive from the second communication device after the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions ACK for the data packet; the processing module is also used to determine that the data packet is successfully sent.

In a possible implementation manner, the N is greater than 1, and the N second communication devices have the same group identifier; the receiving module is also used to delete the N second communication devices after the initial transmission of the data packet Each second communication device in ACK receives an ACK for the data packet; the processing module is also used to determine that the data packet was successfully sent; or, the receiving module is also used to retransmit the data packet and target the data When the number of retransmissions of the packet does not reach the maximum number of retransmissions, an ACK for the data packet is received from each of the N second communication devices; the processing module is also used to determine that the data packet is sent Success; or, the processing module is further configured to determine that the communication device does not receive a NACK for the data packet from any of the N second communication devices after the data packet is initially transmitted. The data packet is successfully sent; or, the processing module is further configured to, after retransmitting the data packet, the number of retransmissions for the data packet does not reach the maximum number of retransmissions, and the communication device does not communicate from the N second communications When any second communication device in the device receives the NACK for the data packet, it determines that the data packet is successfully sent.

In a possible implementation, where N is equal to 1, the receiving module is further used to: after the initial transmission of the data packet, receive a NACK for the data packet from the second communication device; the processing module also uses In order to determine that the data packet has failed to be sent; or the receiving module is further used to receive a response from the second communication device after the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions NACK of the data packet; the processing module is also used to determine that the data packet failed to be sent.

In a possible implementation manner, the N is greater than 1, and the N second communication devices have the same group identifier; the receiving module is also used to delete the N second communication devices after the initial transmission of the data packet At least one second communication device receives a NACK for the data packet; the processing module is also used to determine that the data packet failed to be sent; or the receiving module is also used to retransmit the data packet and for the data packet When the number of retransmissions does not reach the maximum number of retransmissions, a NACK for the data packet is received from at least one of the N second communication devices; the processing module is also used to determine that the data packet fails to be sent .

In a possible implementation manner, the receiving module is further configured to: receive side line configuration information from the network device, where the side line configuration information is used to instruct the communication device to apply a non-adaptive retransmission mode.

In a possible implementation, the side schedule information includes at least one of the following information: the time-frequency resource used for the initial transmission of the data packet, the time interval of the retransmission, the modulation and coding mode, the new data indication, and the hybrid automatic Retransmit the HARQ process number, multiple input multiple output MIMO mode, uplink control channel resource indication, and the communication device identification.

In a possible implementation manner, the sending module is further configured to send a side schedule request to the network device, and the side schedule request is used to request the time-frequency resource for initial transmission of the data packet.

According to a fifth aspect, the present application provides a communication device. The communication device includes: an acquisition module for acquiring uplink control channel resources; a reception module for receiving data packets that are initially transmitted or retransmitted by the first communication device; and a transmission module , For sending negative information NACK to the first communication device if the communication device fails to decode the data packet; or, when the communication device correctly decodes the data packet, on the uplink control channel resource The network device sends an acknowledgement message ACK, which indicates that the data packet was successfully sent.

In a possible implementation manner, the receiving module is further configured to: from the first communication when the communication device fails to decode the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions The device receives indication information, which is used to indicate the end of transmission of the data packet; the sending module is also used to send denial information NACK to the network device on the uplink control channel resource, which indicates that the data packet failed to be sent.

In a possible implementation manner, in a case where the communication device correctly decodes the data packet, the sending module is further configured to: send an ACK to the first communication device.

In a possible implementation manner, the acquisition module is specifically configured to: acquire the uplink control channel resource from the first communication device or the network device.

In a sixth aspect, the present application provides a network device, the network device includes: a sending module for sending downlink control information, the downlink control information includes side scheduling information, the side scheduling information indicates uplink control channel resources and usage The time-frequency resource for initial transmission of data packets between communication devices; the receiving module, used to receive the ACK message sent on the uplink control channel resource; the processing module, used to release the retransmitted data corresponding to the time-frequency resource Time-frequency resources of the package.

In a possible implementation manner, the receiving module is further used to: receive the denial information NACK sent on the uplink control channel resource, the NACK is sent at the end of the data packet transmission; the processing module is used to release the time The time-frequency resource corresponding to the frequency resource to retransmit the data packet.

In a possible implementation manner, the sending module is further configured to send side configuration information, which is used to instruct the communication device to apply a non-adaptive retransmission mode for transmitting data packets.

In a possible implementation manner, the receiving module is further configured to: receive a scheduling request message, and the scheduling request message is used to request the time-frequency resource for initial transmission of data packets between communication devices.

According to a seventh aspect, the present application provides a communication device. The communication device includes a processor, a transceiver, and a memory, and is configured to execute the method described in the first aspect or any implementation manner of the first aspect.

In an eighth aspect, the present application provides a communication device, including a processor, a transceiver, and a memory, for performing the method described in the second aspect or any implementation manner of the second aspect.

In a ninth aspect, the present application provides a network device. The network device includes a processor, a transceiver, and a memory, and is configured to execute the method described in the third aspect or any implementation manner of the third aspect.

According to a tenth aspect, the present application provides a chip, which includes a processor, a transceiver, and a memory, and is configured to execute the method described in the first aspect or any implementation manner of the first aspect.

In an eleventh aspect, the present application provides a chip, which includes a processor, a transceiver, and a memory, and is configured to execute the method described in the second aspect or any implementation manner of the second aspect.

In a twelfth aspect, the present application provides a chip, which includes a processor, a transceiver, and a memory, and is configured to execute the method described in the third aspect or any implementation manner of the third aspect.

In a thirteenth aspect, the present application provides a computer-readable storage medium, including instructions that, when run on a communication device, cause the communication device to perform the method described in the first aspect or any implementation manner of the first aspect.

In a fourteenth aspect, the present application provides a computer-readable storage medium, including instructions that, when run on a communication device, cause the communication device to perform the method described in the second aspect or any implementation manner of the second aspect.

In a fifteenth aspect, the present application provides a computer-readable storage medium, including instructions that, when run on a network device, cause the network device to perform the method described in the third aspect or any implementation manner of the third aspect.

In a sixteenth aspect, the present application provides a computer program product that, when run on a communication device, causes the communication device to perform the method described in the first aspect or any implementation manner of the first aspect.

In a seventeenth aspect, the present application provides a computer program product that, when run on a communication device, causes the communication device to perform the method described in the second aspect or any implementation manner of the second aspect.

In an eighteenth aspect, the present application provides a computer program product that, when run on a network device, causes the network device to perform the method described in the third aspect or any implementation manner of the third aspect.

BRIEF DESCRIPTION

FIG. 1 is a schematic flowchart of a scheduled transmission mode in LTE V2X.

Fig. 2 is a schematic diagram of a car networking scenario.

FIG. 3 is a schematic flowchart of a data transmission method according to an embodiment of the present application.

4 is a schematic flowchart of unicast transmission using an embodiment of the present application.

FIG. 5 is a schematic flowchart of unicast transmission using an embodiment of the present application.

6 is a schematic flowchart of multicast transmission using an embodiment of the present application.

7 is a schematic flowchart of multicast transmission using an embodiment of the present application.

8 is a schematic flowchart of a data transmission method according to another embodiment of the present application.

9 is a schematic flowchart of data transmission using another embodiment of the present application.

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

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

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

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

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

15 is a schematic structural diagram of a network device provided by another embodiment of the present application.

detailed description

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

The technical solutions of the embodiments of the present application may be applied to communication between communication devices and communication devices in various scenarios. For example, in the NR car networking scenario shown in FIG. 2, unicast and multicast transmission of the side link between the vehicle and the vehicle/person/infrastructure, machine communication (machine type communication (MTC)/inter-machine communication ( machine to machine (M2M) scenarios, long term evolution-vehicle (LTE-V), dedicated short-range communication technologies (dedicated short range communications, DSRC), etc.

Embodiments of the present application relate to air interface transmission between network equipment and user equipment and air interface transmission between user equipment and user equipment.

The communication device in the embodiments of the present application may refer to user equipment, terminal equipment, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, User agent or user device. Terminal devices can also be cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (wireless local loop (WLL) stations, personal digital assistants (personal digital assistants, PDAs), wireless communication Functional handheld devices, computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5th generation (5G) systems or new radio (NR) systems, or Terminal devices in a public land mobile communication network (PLMN) that will evolve in the future, etc., are not limited in this embodiment of the present application.

The network device in the embodiment of the present application may be a device for communicating with a communication device, and is deployed in a wireless access network to provide wireless communication services for terminal devices. The network device can be a global mobile communication (global system for mobile communications, GSM) system or a network device (base transceiver station, BTS) in code division multiple access (CDMA) or broadband code division multiple access Network equipment (NodeB, NB) in a wideband code (division multiple access, WCDMA) system, or evolved network equipment (evolved NodeB, eNB, or eNodeB) in an LTE system, or a heterogeneous network (heterogeneous network) , HetNet) micro base station eNB, it can also be a baseband processing unit BBU (baseband unit) and a radio remote unit (RRU) in a distributed base station scenario, or a cloud wireless A wireless controller in a cloud (radio access network, CRAN) scenario, or the network device may be a relay station, an access point, an in-vehicle device, a wearable device, a network device in a future 5G network, or a future evolved PLMN network The network devices and the like in the present application are not limited.

In the embodiments of the present application, "at least one" refers to one or more, and "multiple" refers to two or more. "And/or" describes the association relationship of the associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate the presence of A alone, A and B, and B alone. A and B can be singular or plural. The character "/" generally indicates that the related object is a "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c may be single or multiple.

The scheduling transmission mode of the side link communication is based on the side communication scheduled by the network device. The communication device sends the control message and data of the side communication on the scheduled time-frequency resource according to the side scheduling information of the network device. At present, for the scheduled transmission mode, the network device does not know whether the data packet on the side link is correctly transmitted, and only releases the scheduled resource when the number of data packet transmission reaches the maximum number of retransmissions, and the resource utilization rate is low.

Embodiments of the present application provide a method for transmitting data, which implements a hybrid automatic repeat request (HARQ) technology on a physical layer on a side link, which can improve resource utilization.

FIG. 3 is a schematic flowchart of a data transmission method according to an embodiment of the present application. The method in FIG. 3 includes at least part of the following content.

In 310, the first communication device obtains the retransmission interval and the maximum number of retransmissions.

In 320, the first communication device receives downlink control information from a network device, where the downlink control information includes side scheduling information that indicates uplink control channel resources and time-frequency resources used for initial transmission of data packets.

In 330, the first communication device determines a time-frequency resource for retransmitting the data packet according to the retransmission interval, the maximum number of retransmissions, and the side schedule information.

In 340, the first communication device sends the data packet to N second communication devices on the time-frequency resource for initial transmission and/or retransmission of the data packet, where N is a positive integer.

In 350, if the first communication device determines that the transmission of the data packet fails, the first communication device retransmits the data packet on the time-frequency resource used to retransmit the data packet; or, in the first When a communication device determines that the data packet is successfully sent, the first communication device sends acknowledgement information (acknowledge, ACK) to the network device on the uplink control channel resource, where the ACK indicates that the data packet is successfully sent.

In 360, after the network device receives the ACK sent by the first communication device, the network device releases the time-frequency resource for retransmitting the data packet.

It should be understood that the network device releasing the time-frequency resource for retransmitting the data packet means that the network device no longer reserves the time-frequency resource for retransmitting the data packet. When there is new data transmission, the The time-frequency resource for retransmitting the data packet can be used to transmit new data.

In the above technical solution, the first communication device is used as an end for sending a data packet, and when it is determined that the first communication device successfully transmits the data packet that is initially transmitted or retransmitted to the second communication device, the first communication device sends an ACK to the network device. So that the network equipment can release the reserved retransmission time-frequency resources in time and improve the resource utilization. The first communication device determines the time-frequency resource for retransmitting the data packet according to the time-frequency resource of the initial data packet scheduled by the network device, the time interval for retransmission, and the maximum number of retransmissions. When the initial data packet fails, The first communication device does not need to request the time-frequency resource of the retransmitted data packet from the network device, but directly implements rapid retransmission on the determined time-frequency resource of the retransmitted data packet, thereby reducing the transmission delay. In addition, since the first communication device only sends an ACK to the network device when it is determined that the first communication device has successfully transmitted the initial transmission or retransmission of the data packet to the second communication device, the first communication device determines that the first communication device When the initial communication or retransmission of the second communication device fails to send the data packet, it does not feedback to the network device, that is, does not send negative acknowledgement (NACK) to the network device, which can reduce the gap between the first communication device and the network device Signaling interaction.

The following describes 310-360 in detail.

The retransmission interval may be the interval between the retransmission of the same data packet and the last transmission. Specifically, the time interval of the retransmission may include the time interval between the initial transmission and the first retransmission, and the time interval between two subsequent retransmissions. The time interval between each transmission may be the same or different.

The retransmission interval and the maximum number of retransmissions are the time interval and the maximum number of retransmissions of the retransmission of the transmission data packet on the side link.

The maximum number of times a data packet can be transmitted is the sum of the initial transmission and the maximum number of retransmissions. For example, if the maximum number of retransmissions is 2, then the data packet can be transmitted up to 3 times.

Optionally, the time interval for retransmission and the maximum number of retransmissions may be pre-configured.

Optionally, the first communication device may obtain the retransmission interval and/or the maximum number of retransmissions by receiving the side scheduling information sent by the network device, that is, the side scheduling information may also include the retransmission time interval and/or the maximum The number of retransmissions.

Optionally, the first communication device may obtain the retransmission interval and the maximum number of retransmissions by receiving high-level signaling sent by the network device. The high-level signaling may be radio resource control (RRC) signaling or media access Control (media access control, MAC) layer signaling, etc. That is to say, the time interval of retransmission and the maximum number of retransmissions are configured by the network device for the communication device.

Among them, the RRC signaling may be systemic, or may be sent by the network device to a single communication device.

Optionally, the network device sends the side configuration information to indicate the retransmission mode of the side transmission, for example, adaptive retransmission mode, non-adaptive retransmission mode, etc. After the first communication device receives the side configuration information, The side line configuration information adopts the corresponding retransmission mode. Alternatively, the side configuration information may also include the above-mentioned retransmission interval and maximum retransmission times. In the embodiment of the present application, the side transmission uses a non-adaptive retransmission mode.

In the adaptive retransmission mode, for each data packet transmission, the second communication device feeds back ACK or NACK to the first communication device, and the first communication device feeds back ACK or NACK to the network device. When receiving the NACK, the network device schedules the time-frequency resource for retransmitting the data packet. The time, frequency domain resources, transmission parameters, etc. of such retransmissions are determined dynamically by the network device. In the adaptive retransmission mode, at least one of the retransmission and initial transmission parameters may be different. The retransmission and initial transmission parameters include modulated frequency domain resources, coding mode, multiple input multiple output (MIMO) mode, and so on.

In the non-adaptive retransmission mode, the time-frequency resources for retransmitting data packets are reserved by the network device, and the retransmission parameters are pre-configured, which are the same as the initial transmission. Specifically, after the first communication device requests the network device for time-frequency resources from the side transmission, as shown in FIG. 4, when the data packet transmission fails, the second communication device feeds back a NACK to the first communication device, the first communication The device does not need to request the network device to schedule the side transmission resource, and can use the same transmission parameters as the initial transmission to retransmit the data packet on the reserved retransmission time-frequency resource after receiving the NACK.

Optionally, the side configuration information may further include a side feedback channel, a side feedback transmission time interval, and an uplink control channel resource indicator. The time interval for sending the side feedback is the time interval between transmitting the data packet and transmitting the ACK or NACK on the side link.

The first communication device may feed back the success or failure of the side link data transmission to the network device on the uplink control channel resource.

The control channel for carrying the feedback information that the first communication device feeds back to the network device whether the transmission of the side link data packet is successful may adopt the same design as the physical uplink control channel (physical uplink control channel, PUCCH).

Alternatively, the first communication device may obtain PUCCH information by the following method: the network upper layer configures a resource group for side feedback, and the time domain resource for feedback may be added to the side scheduling information by adding an indication field (for example, PDCCH-to- HARQ_feedback timing indicator); the specific resource group to be used can be determined according to the number of information bits fed back; the specific frequency domain resources and cyclic shift parameters can be designed with the PUCCH, by sending the downlink control information of the side scheduling information (downlink The control channel element (CCE) index of the control information (DCI), the uplink control channel resource index (PUCCH resource index) carried in the DCI, and the parameters of the high-level configuration are determined together, and will not be repeated here.

Optionally, each initial transmission and retransmission corresponds to an uplink control channel. If the first communication device does not feedback an ACK, the uplink control channel resource is not used. The network device determines the number of side transmissions by detecting on which upstream control channel the ACK is received.

Optionally, the first communication device may also obtain uplink control channel resources through the side configuration information. That is to say, the side line configuration information may also include an uplink control channel indicator.

Optionally, the first communication device may obtain the retransmission interval and/or the maximum number of retransmissions by receiving the side scheduling information sent by the network device, that is, the side scheduling information also includes the retransmission time interval and/or the maximum retransmission Number of transmissions.

Specifically, the first communication device determines the time-frequency resource for retransmitting the data packet according to the time interval of retransmission, the maximum number of retransmissions, and the time-frequency resource for initial transmission of the data packet.

For example, the time domain resource of the initial transmission data packet occupies an (orthogonal frequency division multiplexing, OFDM) symbol with an index number of 0, the retransmission interval is 1 time slot, and the maximum number of retransmissions is 2. The first retransmission The time domain resource of the data packet occupies the time slot with index number 2, the time domain resource of the second retransmission of the data packet occupies the time slot with index number 4; the frequency domain resource of the retransmission of the data packet and the initial transmission of the data The frequency domain resources of the packets are the same.

The time domain resources in the side communication resources may be different time granularities such as frames, subframes, time slots, mini-slots, orthogonal frequency division multiplexing (OFDM) symbols. The time slot includes several consecutive OFDM symbols. In NR, for a normal cyclic prefix (NCP), one slot includes 14 OFDM symbols, and for extended CP (extended CP, ECP), one slot includes 12 OFDM symbols.

Optionally, the time-frequency resource for retransmitting the data packet may also be indicated in the side schedule information.

Optionally, before the first communication device receives the downlink control information, the first communication device sends a side scheduling request to the network device to request the network device for time-frequency resources for initial transmission of the data packet, or for initial transmission The time-frequency resource of the data packet and the time-frequency resource used to retransmit the data packet.

Optionally, the side scheduling request includes a scheduling request (scheduling request, SR) and a buffer status report (buffer status report, BSR).

The first communication device will retransmit the data packet on the time-frequency resource of the next retransmission of the data packet when the initial data packet fails or a certain retransmission data packet fails to reach the maximum number of retransmissions. That is to say, the first communication device will perform multiple transmissions until the transmission is successful or the maximum number of retransmissions is reached; when the data packet transmission is successful, the data packet will not be retransmitted.

The first communication device sends a data packet to the second communication device. When N is 1, the first communication device performs unicast transmission with the second communication device; when N is greater than 1, the first communication device simultaneously performs multicast transmission with N second communication devices, and the N second communication devices have The same group ID.

For each transmission, the first communication device determines whether the data packet is successfully sent.

Further, in 350 and 360, when the first communication device determines that the data packet transmission fails, the first communication device retransmits the data packet on the time-frequency resource used to retransmit the data packet; Or, when the first communication device determines that the data packet is successfully sent, the first communication device sends confirmation information ACK to the network device on the uplink control channel resource, and the ACK indicates that the data packet is successfully sent. After the network device receives the ACK sent by the first communication device, the network device releases the time-frequency resource used to retransmit the data packet. That is to say, the first communication device only sends an ACK to the network device when it is determined that the first communication device successfully transmitted the initial transmission or retransmission of the data packet to the second communication device, and the first communication device determines the first communication device When the initial transmission or retransmission of the data packet to the second communication device fails to be sent, no feedback is sent to the network device, that is, NACK is not sent, which can reduce signaling interaction between the first communication device and the network device.

It should be understood that the first communication device determines whether the data packet is successfully sent or failed for the current transmission. The current transmission may be an initial transmission or a retransmission.

In some embodiments, when N is 1, after the initial transmission of the data packet, the first communication device receives a NACK for the data packet from the second communication device, at which time the first communication device determines that the data packet failed to be sent; Or, after the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device receives a NACK for the data packet from the second communication device, and the first communication The device determines that the data packet failed to be sent. When it is determined that the transmission of the data packet fails, the first communication device retransmits the data packet on the time-frequency resource used to retransmit the data packet.

When N is 1, after the initial transmission of the data packet, the first communication device receives an ACK for the data packet from the second communication device, at which time the first communication device determines that the data packet was successfully sent; or, during the retransmission After the data packet and when the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device receives an ACK for the data packet from the second communication device, at which time the first communication device determines that the data packet is sent success. When it is determined that the transmission of the data packet fails, the first communication device retransmits the data packet on the time-frequency resource used to retransmit the data packet; when it is determined that the data packet is successfully transmitted, the first communication device is on the uplink control channel resource Acknowledgement information ACK is sent to the network device so that the network device can release the reserved time-frequency resources for retransmitting the data packet in time. Among them, ACK indicates that the data packet was successfully sent.

The method of the embodiments of the present application will be described in detail with reference to specific examples. 4 is a schematic flowchart of data transmission using an embodiment of the present application. It should be understood that FIG. 4 only takes the maximum number of retransmissions of 2 as an example.

The network device schedules the initial transmission and retransmission resources of the side transmission for the first communication device according to the side scheduling request sent by the first communication device, and determines the side transmission parameters, including modulation and coding mode, MIMO mode, etc.; The first communication device delivers side schedule information.

The first communication device receives the side scheduling information delivered by the network device; the first communication device determines the time-frequency resource for retransmitting the data packet; the first communication device sends the initial transmission time-frequency resource according to the transmission parameter indicated by the side scheduling information Side packet.

The second communication device receives and decodes the side data packet sent by the first communication device on the side link; the second communication device judges whether the decoding is correct, and if the decoding is correct, feeds back an ACK on the side feedback channel, if the decoding fails , Then feed back NACK on the side feedback channel.

Optionally, if the side data is retransmission data, the second communication device may include combined decoding when decoding the data packet.

The first communication device receives the ACK or NACK fed back by the second communication device on the side feedback channel; if it is ACK, the first communication device forwards the ACK to the network device, if it is NACK and the maximum number of retransmissions has not been reached, the first communication device Use retransmission time-frequency resources for retransmission.

The network device monitors the feedback message for side transmission on the uplink control channel. When the number of retransmissions of the side data packet does not reach the maximum number of retransmissions, if an ACK is received, the reserved retransmission time-frequency resources are released. Specifically, if new data is available, the network device is triggered to sidewalk the new data Transmission scheduling; if no ACK is received, the network device continues to reserve retransmission time-frequency resources. When the number of side data packet retransmissions reaches the maximum number of retransmissions, if there is new data, the network device triggers the side data transmission scheduling of the new data.

Considering that in some scenarios (for example, system congestion), the first communication device is allowed to terminate HARQ retransmission of the data packet in advance, as shown in FIG. 5, the method of the embodiment of the present application may also determine that the first communication device sends the data packet. In the case of failure and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device sends indication information to N second communication devices, the indication information is used to indicate the end of the data packet transmission; the first communication device NACK is sent to the network device on the uplink control channel resource, the NACK indicates that the data packet failed to be sent. At this time, when receiving the ACK or NACK sent by the first communication device, the network device releases the reserved retransmission time-frequency resources.

When N is greater than 1, after the initial transmission of the data packet, the first communication device receives a NACK for the data packet from at least one of the N second communication devices, at this time the first communication device determines the data packet The transmission fails; or, after retransmitting the data packet and when the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device receives from at least one second communication device among the N second communication devices For the NACK of the data packet, at this time, the first communication device determines that the data packet fails to be sent. When it is determined that the transmission of the data packet fails, the first communication device retransmits the data packet on the time-frequency resource used to retransmit the data packet.

Optionally, the first communication device may retransmit the data packet to each of the N second communication devices.

Optionally, the first communication device may also retransmit the data packet only to the second communication device that feeds back NACK.

When N is greater than 1, as shown in FIG. 6, after the initial transmission of the data packet, the first communication device receives an ACK for the data packet from each of the N second communication devices, the first The communication device determines that the data packet is successfully sent; or, after retransmitting the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device selects from each of the N second communication devices The second communication device receives the ACK for the data packet, and at this time, the first communication device determines that the data packet is successfully transmitted. Or, as shown in FIG. 7, after the initial transmission of the data packet, the first communication device does not receive a NACK for the data packet from any one of the N second communication devices, the first communication device determines The data packet is successfully sent; or, after the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device does not select any second from the N second communication devices The communication device receives a NACK for the data packet, and at this time, the first communication device determines that the data packet is successfully transmitted.

When it is determined that the data packet is successfully sent, the first communication device sends confirmation information ACK to the network device on the uplink control channel resource, so that the network device releases the reserved time-frequency resource for retransmitting the data packet in time. Among them, ACK indicates that the data packet was successfully sent.

Optionally, for a case where N is greater than 1, each second communication device in the multicast group is configured according to the index of the second communication device in the multicast group (for example, identification index (ID index)) There is a dedicated side feedback channel. The second communication device feeds back ACK or NACK on the respective dedicated side feedback channel according to whether the data packet is correctly decoded. The first communication device receives the ACK or NACK fed back by the second communication device in the multicast group on the dedicated feedback channel of each second communication device.

Optionally, as shown in the multicast group, each second communication device may also use a common side feedback channel. If the second communication device fails to decode the data packet, it feeds back NACK on the common side feedback channel; if the second communication device successfully decodes the data packet, it feeds back ACK or no feedback on the common side feedback channel. The first communication device performs the operation after receiving the ACK when the NACK is not received or receives the ACK fed back by each second communication device; the first communication device performs the operation after receiving the NACK when receiving the NACK.

Embodiments of the present application also provide another method for transmitting data, which implements a physical layer hybrid automatic retransmission request technology, which can improve resource utilization.

8 is a schematic flowchart of a data transmission method according to another embodiment of the present application. The method in FIG. 8 includes at least part of the following content.

In 810, the first communication device obtains the retransmission interval and the maximum number of retransmissions.

In 820, the first communication device receives downlink control information from the network device, where the downlink control information includes side scheduling information that indicates uplink control channel resources and time-frequency resources for initial transmission of data packets.

In 830, the second communication device acquires uplink control channel resources.

Optionally, the second communication device obtains uplink control channel resources from the network device. Specifically, the second communication device may simultaneously receive the side scheduling information delivered by the network device to obtain the uplink control channel resource.

Optionally, the second communication device acquires uplink control channel resources from the first communication device. Specifically, the first communication device forwards the information for determining the uplink control channel resource carried in the DCI to the second communication device on the side link. The information forwarded by the first communication device is carried in sidelink control information (sidelink control information), including an uplink control channel resource indicator used to indicate the time domain resource of the uplink control channel, a frequency domain resource used to indicate the uplink control channel, and a cyclic shift CCE index and PUCCH resource index of other information.

In 840, the first communication device determines a time-frequency resource for retransmitting the data packet according to the retransmission time interval, the maximum number of retransmissions, and the side schedule information.

In 850, the first communication device sends the data packet to N second communication devices on the time-frequency resource for initial transmission and/or retransmission of the data packet, where N is a positive integer.

In 860, when the second communication device fails to decode the data packet, the second communication device sends a negative information NACK to the first communication device and executes 870; or, the second communication device correctly decodes the data packet In the case of a data packet, the second communication device sends an acknowledgement message ACK to the network device on the uplink control channel resource, the ACK indicates that the data packet was successfully sent, and executes 880.

Optionally, the second communication device receives the data packet initially transmitted by the first communication device; the second communication device decodes the data packet initially transmitted, and in the case of decoding failure, the second communication device The communication device sends a NACK; and/or the second communication device receives the data packet retransmitted by the first communication device, and in the case of decoding failure, the second communication device sends a NACK to the first communication device.

Optionally, in the case that the second communication device correctly decodes the data packet, the second communication device sends an ACK to the first communication device. Specifically, the second communication device receives the data packet initially transmitted by the first communication device; the second communication device decodes the initially transmitted data packet; and when the decoding is correct, the second communication device sends the data packet to the first communication device Send ACK; or the second communication device receives the data packet retransmitted by the first communication device; the second communication device decodes the retransmitted data packet; if the decoding is correct, the second communication device sends the first communication device Send ACK.

In 870, the first communication device retransmits the data packet on the time-frequency resource used to retransmit the data packet.

In 880, after the network device receives the ACK sent by the first communication device, the network device releases the time-frequency resource for retransmitting the data packet.

For the 810, 820, 840, 850, 870, and 880 in this embodiment, reference may be made to the related description in FIG. 3 above, and details are not described herein again.

The method of the embodiments of the present application will be described in detail with reference to specific examples. 9 is a schematic flowchart of data transmission using another embodiment of the present application. It should be understood that FIG. 9 only takes the maximum number of retransmissions as 2 as an example.

The second communication device acquires the uplink control channel resource; the second communication device receives and decodes the side data packet sent by the first communication device on the side link; the second communication device determines whether the decoding is correct, and if the decoding is correct, the side ACK is fed back on the horizontal feedback channel and the uplink control channel, and if decoding fails, NACK is fed back on the side feedback channel.

The first communication device receives the ACK or NACK fed back by the second communication device on the side feedback channel; if it is ACK, the first communication device stops sending the data packet, if it is NACK and the maximum number of retransmissions is not reached, the first communication The device uses retransmission time-frequency resources for retransmission.

Considering that in some scenarios (for example, system congestion), the first communication device is allowed to terminate HARQ retransmission of the data packet in advance, the method of the embodiment of the present application may also determine that the first communication device fails to send the data packet and target the data packet When the number of retransmissions does not reach the maximum number of retransmissions, the first communication device sends indication information to N second communication devices, the indication information is used to indicate the end of the packet transmission; the second communication device receives and decodes the first communication Control information sent by the device on the side link; the second communication device determines whether it is stop retransmission indication information, and if it is, the second communication device sends denial information NACK to the network device on the uplink control channel resource, the NACK indicates the Failed to send the data packet. At this time, when receiving the ACK or NACK sent by the second communication device, the network device releases the reserved retransmission time-frequency resources.

The device embodiments of the present application will be described below with reference to FIGS. 10 to 15.

10 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device 1000 in FIG. 10 may correspond to the above first communication device, or may be another communication device that implements the above method, such as a system-on-a-chip (SOC) or baseband chip Wait. As shown in FIG. 10, the communication device 1000 includes a receiving module 1010, a sending module 1020, a processing module 1030, and an acquiring module 1040.

The obtaining module 1040 is used to obtain the retransmission interval and the maximum number of retransmissions.

Optionally, in the case where the retransmission interval and the maximum number of retransmissions are pre-configured, the function of the acquisition module may be implemented by the processor.

Optionally, the communication device 1000 may receive the side schedule information sent by the network device through the receiver, thereby obtaining the retransmission interval and/or the maximum number of retransmissions. In this case, the function of the obtaining module may be implemented by the transceiver Or, the acquisition module may be implemented by the processor controlling the transceiver.

The receiving module 1010 is configured to receive downlink control information from a network device. The downlink control information includes side scheduling information, which indicates uplink control channel resources and time-frequency resources used for initial transmission of data packets.

The processing module 1030 is configured to determine a time-frequency resource for retransmitting the data packet according to the retransmission time interval, the maximum number of retransmissions, and the side schedule information.

The sending module 1020 is configured to send the data packet to N second communication devices on the time-frequency resource used for initial transmission and/or retransmission of the data packet, where N is a positive integer.

The sending module 1020 is further configured to retransmit the data packet on the time-frequency resource used to retransmit the data packet when the communication device 1000 determines that the data packet failed to be transmitted; or, on the communication device 1000 When it is determined that the data packet is successfully sent, a confirmation message ACK is sent to the network device on the uplink control channel resource, and the ACK indicates that the data packet is successfully sent.

Optionally, the sending module 1020 is further configured to: when the communication device 1000 determines that the data packet fails to be sent and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, to the N second communications The device sends indication information, which is used to indicate the end of the data packet transmission; NACK is sent to the network device on the uplink control channel resource, and the NACK indicates that the data packet failed to be sent.

Optionally, the N is equal to 1; the receiving module 1010 is further configured to: after initially transmitting the data packet, receive an ACK for the data packet from the second communication device. The processing module 1030 is also used to determine that the data packet is successfully sent; or, the receiving module 1010 is also used to after the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, An ACK for the data packet is received from the second communication device; the processing module 1030 is also used to determine that the data packet is successfully sent.

Optionally, the N is greater than 1, and the N second communication devices have the same group identifier; the receiving module 1010 is also used to, after the initial transmission of the data packet, from each of the N second communication devices. The second communication device receives an ACK for the data packet; the processing module 1030 is also used to determine that the data packet was successfully sent; or, the receiving module 1010 is also used to retransmit the data packet and to the data packet. When the number of retransmissions does not reach the maximum number of retransmissions, an ACK for the data packet is received from each of the N second communication devices; the processing module 1030 is also used to determine that the data packet is successfully sent Or, the processing module 1030 is also used to determine when the communication device 1000 does not receive a NACK for the data packet from any one of the N second communication devices after the data packet is initially transmitted. The data packet is successfully sent; or, the processing module 1030 is further configured to: after the data packet is retransmitted, the number of retransmissions for the data packet does not reach the maximum number of retransmissions, and the communication device 1000 does not change from the N When any one of the second communication devices receives the NACK for the data packet, it is determined that the data packet is successfully sent.

Optionally, the N is equal to 1, and the receiving module 1010 is further configured to: after initially transmitting the data packet, receive a NACK for the data packet from the second communication device; the processing module 1030 is also used to determine the Failure to send a data packet; or the receiving module 1010 is also used to receive the data for the data from the second communication device after the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions NACK of the packet; the processing module 1030 is also used to determine that the data packet failed to be sent.

Optionally, the N is greater than 1, and the N second communication devices have the same group identifier; the receiving module 1010 is further configured to, after initially transmitting the data packet, select at least one of the N second communication devices. The second communication device receives a NACK for the data packet; the processing module 1030 is also used to determine that the data packet failed to be sent; or the receiving module 1010 is also used to retransmit the data packet and re-target the data packet. When the number of transmissions does not reach the maximum number of retransmissions, a NACK for the data packet is received from at least one of the N second communication devices; the processing module 1030 is also used to determine that the data packet fails to be sent.

Optionally, the receiving module 1010 is further configured to: receive side line configuration information from the network device, where the side line configuration information is used to instruct the communication device 1000 to apply a non-adaptive retransmission mode.

Optionally, the side schedule information includes at least one of the following information: the time-frequency resource used for the initial transmission of the data packet, the time interval of the retransmission, the modulation and coding mode, the new data indication, and the hybrid automatic retransmission HARQ process number , A multiple input multiple output MIMO mode, an uplink control channel resource indication, and the identification of the communication device 1000.

Optionally, the sending module 1020 is further configured to: send a side scheduling request to the network device, and the side scheduling request is used to request the time-frequency resource for initial transmission of the data packet.

The receiving module 1010 may be implemented by a receiver. The processing module 1030 may be implemented by a processor. The sending module 1020 may be implemented by a sender. The obtaining module 1040 may be implemented by a receiver or a processor. For specific functions and beneficial effects of the receiving module 1010, the sending module 1020, the processing module 1030, and the obtaining module 1040, reference may be made to the method shown in FIG. 3, and details are not described herein again.

11 is a schematic structural diagram of a communication device according to another embodiment of the present application. The communication device 1100 in FIG. 11 may correspond to the above second communication device, or may be other communication devices that implement the above method, such as a system-on-chip, a system-on-chip SOC, or a baseband chip. As shown in FIG. 11, the communication device 1100 includes a receiving module 1110, a sending module 1120, and an acquiring module 1140.

The obtaining module 1140 is used to obtain uplink control channel resources.

The receiving module 1110 is configured to receive an initial transmission or retransmission data packet of the first communication device.

The sending module 1120 is configured to send a negative information NACK to the first communication device if the communication device 1100 fails to decode the data packet; or, if the communication device 1100 correctly decodes the data packet, the uplink Acknowledgement information ACK is sent to the network device on the control channel resource, and the ACK indicates that the data packet is successfully sent.

Optionally, the receiving module 1110 is further configured to: receive an indication from the first communication device when the communication device 1100 fails to decode the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions Information, the indication information is used to indicate the end of the data packet transmission; the sending module 1120 is also used to send a denial of information NACK to the network device on the uplink control channel resource, the NACK indicates that the data packet failed to be sent.

Optionally, in a case where the communication device 1100 correctly decodes the data packet, the sending module 1120 is further configured to: send an ACK to the first communication device.

Optionally, the obtaining module 1140 is specifically configured to: obtain uplink control channel resources from the first communication device or the network device.

The receiving module 1110 may be implemented by a receiver. The obtaining module 1140 may be realized by a receiver. The sending module 1120 may be implemented by a sender. For specific functions and beneficial effects of the receiving module 1110, the sending module 1120, and the acquiring module 1140, reference may be made to the method shown in FIG. 8, and details are not described herein again.

12 is a schematic structural diagram of a network device according to an embodiment of the present application. The network device 1200 in FIG. 12 may correspond to the above network device, or may be another communication device that implements the above method, such as a system-on-chip, a system-on-chip SOC, or a baseband chip. As shown in FIG. 12, the network device 1200 includes a receiving module 1210, a sending module 1220, and a processing module 1230.

The sending module 1220 is configured to send downlink control information, the downlink control information including side scheduling information, which indicates uplink control channel resources and time-frequency resources used for initial transmission of data packets between communication devices.

The receiving module 1210 is configured to receive acknowledgement information ACK sent on the uplink control channel resource;

The processing module 1230 is configured to release the time-frequency resource corresponding to the time-frequency resource and retransmit the data packet.

Optionally, the receiving module 1210 is further configured to: receive denial information NACK sent on the uplink control channel resource, the NACK is sent at the end of data packet transmission; the processing module 1230 is used to release the time-frequency resource corresponding Time-frequency resource for retransmitting the data packet.

Optionally, the sending module 1220 is further configured to send side configuration information, which is used to instruct a non-adaptive retransmission mode for data packets transmitted between the communication devices.

Optionally, the side row configuration information further includes a retransmission interval and a maximum number of retransmissions.

Optionally, the side schedule information includes at least one of the following information: the time-frequency resource used for the initial transmission of the data packet, the time interval of the retransmission, the modulation and coding mode, the new data indication, and the hybrid automatic retransmission HARQ process number , A multiple-input multiple-output MIMO mode, an uplink control channel resource indicator, and a first communication device identifier.

Optionally, the receiving module 1210 is further configured to: receive a scheduling request message, and the scheduling request message is used to request the time-frequency resource for initial transmission of data packets between communication devices.

The receiving module 1210 may be implemented by a receiver. The processing module 1230 may be implemented by a processor. The sending module 1220 may be implemented by a sender. For specific functions and beneficial effects of the receiving module 1210, the sending module 1220, and the processing module 1230, reference may be made to the method shown in FIG. 2 or 3, and details are not described herein again.

13 is a schematic structural diagram of a communication device according to another embodiment of the present application. The communication device 1300 in FIG. 13 may correspond to the above first communication device, or may be another communication device that implements the above method, for example, a system-on-chip, a system-on-chip SOC, or a baseband chip. As shown in FIG. 13, the communication device 1300 includes a transceiver 1310, a processor 1320, and a memory 1330.

Only one memory and processor are shown in FIG. In actual communication device products, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or storage device. The memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiments of the present application.

The transceiver 1310, the processor 1320, and the memory 1330 communicate with each other through an internal connection path, and transfer control and/or data signals.

Specifically, in the case where the retransmission interval and the maximum number of retransmissions are pre-configured, the processor 1320 obtains the retransmission interval and the maximum number of retransmissions from the memory 1330; or the transceiver 1310 receives the side line sent by the network device Scheduling information to obtain the time interval and/or the maximum number of retransmissions of the retransmission; or the processor 1320 controls the transceiver 1310 to obtain the time interval and/or the maximum number of retransmissions of the retransmission.

The transceiver 1310 is also used to receive downlink control information from the network device. The downlink control information includes side scheduling information, which indicates uplink control channel resources and time-frequency resources for initial transmission of data packets.

The processor 1320 is configured to determine a time-frequency resource for retransmitting the data packet according to the retransmission time interval, the maximum number of retransmission times, and the side schedule information.

The transceiver 1310 is further configured to send the data packet to N second communication devices on the time-frequency resource used for initial transmission and/or retransmission of the data packet, where N is a positive integer.

The transceiver 1310 is further configured to retransmit the data packet on the time-frequency resource used to retransmit the data packet when the communication device 1300 determines that the data packet has failed to be transmitted; or, to determine the communication device 1300 When the data packet is successfully sent, an ACK message is sent to the network device on the uplink control channel resource, and the ACK indicates that the data packet is successfully sent.

For the specific working process and beneficial effects of the communication device 1300, reference may be made to the description in the embodiment shown in FIG. 3, and details are not repeated herein.

14 is a schematic structural diagram of a communication device according to another embodiment of the present application. The communication device 1400 in FIG. 14 may correspond to the above second communication device, or may be other communication devices that implement the above method, such as a system-on-chip, a system-on-chip SOC, or a baseband chip. As shown in FIG. 14, the communication device 1400 includes a transceiver 1310, a processor 1420, and a memory 1430.

The transceiver 1410, the processor 1420, and the memory 1430 communicate with each other through an internal connection path, and transfer control and/or data signals.

Specifically, the transceiver 1410 is configured to acquire uplink control channel resources.

The transceiver 1410 is also used to receive the first transmission or retransmission data packet of the first communication device.

The transceiver 1410 is further configured to send a negative information NACK to the first communication device if the communication device 1400 fails to decode the data packet; or, in the case where the communication device 1400 correctly decodes the data packet, Acknowledgement information ACK is sent to the network device on the uplink control channel resource, and the ACK indicates that the data packet is successfully sent.

For the specific working process and beneficial effects of the communication device 1400, reference may be made to the description in the embodiment shown in FIG. 8, which will not be repeated here.

15 is a schematic structural diagram of a network device provided by another embodiment of the present application. The network device 1500 in FIG. 15 may correspond to the above network device, or may be other communication devices that implement the above method, such as a system-on-chip, a system-on-chip SOC, or a baseband chip. As shown in FIG. 15, the network device 1500 includes a transceiver 1510, a processor 1520, and a memory 1530.

Only one memory and processor are shown in FIG. In actual network equipment products, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or storage device. The memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiments of the present application.

The transceiver 1510, the processor 1520, and the memory 1530 communicate with each other through an internal connection channel, and transfer control and/or data signals.

Specifically, the transceiver 1510 is configured to send downlink control information, and the downlink control information includes side scheduling information, which indicates uplink control channel resources and time-frequency resources for initial transmission of data packets between communication devices .

The transceiver 1510 is also used to receive the acknowledgement information ACK sent on the uplink control channel resource;

The processor 1520 is configured to release the time-frequency resource corresponding to the time-frequency resource and retransmit the data packet.

For the specific working process and beneficial effects of the communication device 1500, reference may be made to the description in the embodiment shown in FIG. 2 or 3, and details are not described herein again.

The transceiver described in each embodiment of the present application may also be referred to as a transceiver unit, a transceiver, a transceiver device, or the like. The processor may also be called a processing unit, a processing board, a processing module, a processing device, and the like. Optionally, the device used to implement the receiving function in the transceiver may be regarded as a receiving unit, and the device used to implement the transmitting function in the transceiver may be regarded as a transmitting unit, that is, the transceiver includes a receiving unit and a transmitting unit. The receiving unit may sometimes be called a receiver, a receiver, or a receiving circuit. The sending unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit.

The memories described in the embodiments of the present application are used to store computer instructions and parameters required for the operation of the processor.

The processor described in the embodiments of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor or instructions in the form of software. The processor described in the embodiments of the present application may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), or an existing programmable gate array (field programmable gate array) , FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware decoding processor, or may be executed and completed by a combination of hardware and software modules in the decoding processor. The software module may be located in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory or electrically erasable programmable memory, registers, etc. Storage media. The storage medium is located in the memory. The processor reads the instructions in the memory and combines the hardware to complete the steps of the above method.

In various embodiments of the present application, the value of the sequence number of each process does not mean that the execution order is sequential, and the execution order of each process should be determined by its function and internal logic, and should not correspond to the implementation process of the embodiments of this application Constitute any limitation.

In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented using software, it can 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. When the computer program instructions are loaded and executed on the computer, all or part of the processes or functions according to the embodiments of the present application are generated. The computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices. 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 from a website site, computer, server or data center Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as 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 including one or more available medium integrated servers, data centers, and the like. The available media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, digital video disc (DVD)), or semiconductor media (eg, solid state disk (SSD)), etc. .

Those of ordinary skill in the art may realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application of the technical solution and design constraints. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that for the convenience and conciseness of the description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the foregoing method embodiments, and details are not described herein again.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the unit is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical, or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or may be distributed on multiple 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 into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application essentially or part of the contribution to the existing technology or part of the technical solution can be embodied in the form of a software product, the computer software product is stored in a storage medium, including Several instructions are used to enable 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. The foregoing storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

The above is only the specific implementation of this application, but the scope of protection of this application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application. It should be covered by the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A method for transmitting data, characterized in that it includes:

The first communication device obtains the retransmission interval and the maximum number of retransmissions;

The first communication device receives downlink control information from a network device, where the downlink control information includes side scheduling information, and the side scheduling information indicates uplink control channel resources and time-frequency resources for initial transmission of data packets;

The first communication device determines a time-frequency resource for retransmitting the data packet according to the retransmission interval, the maximum number of retransmissions, and the side schedule information;

The first communication device sends the data packet to N second communication devices on the time-frequency resource for initial transmission and/or retransmission of the data packet, where N is a positive integer;

When the first communication device determines that the transmission of the data packet fails, the first communication device retransmits the data packet on the time-frequency resource for retransmitting the data packet; or,

When the first communication device determines that the data packet is successfully sent, the first communication device sends confirmation information ACK to the network device on the uplink control channel resource, the ACK indicates the data packet Sent successfully.
The method according to claim 1, wherein the method further comprises:

When the first communication device determines that the transmission of the data packet fails and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device communicates with the N second The device sends instruction information, where the instruction information is used to indicate the end of sending the data packet;

The first communication device sends denial information NACK to the network device on the uplink control channel resource, where the NACK indicates that the data packet failed to be sent.
The method according to claim 1 or 2, wherein the N is equal to 1; the first communication device determining that the data packet is successfully sent includes:

After initially transmitting the data packet, the first communication device receives an ACK for the data packet from the second communication device;

The first communication device determines that the data packet is successfully sent; or,

After retransmitting the data packet and when the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device receives an ACK for the data packet from the second communication device ;

The first communication device determines that the data packet is successfully sent.
The method according to claim 1 or 2, wherein the N is greater than 1, and the N second communication devices have the same group identifier;

The first communication device determining that the data packet is successfully sent includes:

After initially transmitting the data packet, the first communication device receives an ACK for the data packet from each of the N second communication devices;

The first communication device determines that the data packet is successfully sent; or,

After the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device selects from each of the N second communication devices Received an ACK for the data packet;

The first communication device determines that the data packet is successfully sent; or,

After the initial transmission of the data packet, the first communication device does not receive a NACK for the data packet from any one of the N second communication devices;

The first communication device determines that the data packet is successfully sent; or,

After the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device does not communicate from any one of the N second communication devices The device receives a NACK for the data packet;

The first communication device determines that the data packet is successfully sent.
The method according to claim 1 or 2, wherein the N is equal to 1, and the first communication device determines that the data packet transmission fails, including:

After initially transmitting the data packet, the first communication device receives a NACK for the data packet from the second communication device;

The first communication device determines that the data packet transmission fails; or,

After retransmitting the data packet and when the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device receives a NACK for the data packet from the second communication device ;

The first communication device determines that the data packet failed to be sent.
The method according to claim 1 or 2, wherein the N is greater than 1, and the N second communication devices have the same group identifier;

The first communication device determining that the data packet transmission fails includes:

After initially transmitting the data packet, the first communication device receives a NACK for the data packet from at least one of the N second communication devices;

The first communication device determines that the data packet transmission fails; or,

After retransmitting the data packet and when the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device selects at least one second communication device from the N second communication devices Received a NACK for the data packet;

The first communication device determines that the data packet failed to be sent.
The method according to any one of claims 1 to 6, wherein the method further comprises:

The first communication device receives side configuration information from the network device, and the side configuration information is used to instruct the first communication device to apply a non-adaptive retransmission mode.
The method according to any one of claims 1 to 7, wherein the side schedule information includes at least one of the following information: the time-frequency resource for initial transmission of data packets, the retransmission Time interval, modulation and coding mode, new data indication, hybrid automatic retransmission HARQ process number, multiple input multiple output MIMO mode, uplink control channel resource indication, and the first communication device identification.
The method according to any one of claims 1 to 8, wherein the method further comprises:

The first communication device sends a side scheduling request to the network device, where the side scheduling request is used to request the time-frequency resource for initial transmission of the data packet.
A method for transmitting data, characterized in that it includes:

The second communication device obtains uplink control channel resources;

The second communication device receives a data packet that is initially transmitted or retransmitted by the first communication device;

In the case where the second communication device fails to decode the data packet, the second communication device sends negative information NACK to the first communication device; or,

In the case that the second communication device correctly decodes the data packet, the second communication device sends confirmation information ACK to the network device on the uplink control channel resource, and the ACK indicates that the data packet is successfully sent.
The method of claim 10, further comprising:

When the second communication device fails to decode the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the second communication device receives an indication from the first communication device Information, the instruction information is used to indicate the end of the data packet transmission;

The second communication device sends denial information NACK to the network device on the uplink control channel resource, where the NACK indicates that the data packet failed to be sent.
The method according to claim 10 or 11, wherein in the case that the second communication device correctly decodes the data packet, the method further comprises:

The second communication device sends an ACK to the first communication device.
The method according to any one of claims 10 to 12, wherein the acquiring the uplink control channel resource by the second communication device includes:

The second communication device acquires uplink control channel resources from the first communication device or the network device.
A method for transmitting data, characterized in that it includes:

The network device sends downlink control information, and the downlink control information includes side scheduling information, which indicates uplink control channel resources and time-frequency resources used for initial transmission of data packets between communication devices;

The network device receives ACK information sent on the uplink control channel resource;

The network device releases the time-frequency resource corresponding to the time-frequency resource and retransmits the data packet.
The method according to claim 14, wherein the method further comprises:

The network device receives denial information NACK sent on the uplink control channel resource, the NACK is sent at the end of the data packet transmission;

The network device releases the time-frequency resource corresponding to the time-frequency resource and retransmits the data packet.
The method according to claim 14 or 15, wherein the method further comprises:

The network device sends side configuration information, and the side configuration information is used to instruct a non-adaptive retransmission mode for data packets transmitted between the communication devices.
The method according to claim 16, wherein the sideline configuration information further includes a retransmission interval and a maximum number of retransmissions.
The method according to any one of claims 14 to 17, wherein the side schedule information includes at least one of the following information: the time-frequency resource for initial transmission of data packets, the retransmission Time interval, modulation and coding mode, new data indication, hybrid automatic retransmission HARQ process number, multiple input multiple output MIMO mode, uplink control channel resource indication, and first communication device identification.
The method according to any one of claims 14 to 18, wherein the method further comprises:

The network device receives a scheduling request message, and the scheduling request message is used to request the time-frequency resource used to initially transmit a data packet between communication devices.
A communication device, characterized in that it includes:

Acquisition module, used to obtain the retransmission interval and the maximum number of retransmissions;

A receiving module, configured to receive downlink control information from a network device, where the downlink control information includes side scheduling information, which indicates uplink control channel resources and time-frequency resources for initial transmission of data packets;

A processing module, configured to determine a time-frequency resource for retransmitting the data packet according to the retransmission time interval, the maximum number of retransmissions, and the side schedule information;

A sending module, configured to send the data packet to N second communication devices on the time-frequency resource for initial transmission and/or retransmission of the data packet, where N is a positive integer;

The sending module is further configured to retransmit the data packet on the time-frequency resource for retransmitting the data packet when the communication device determines that the data packet has failed to be sent; or, When the communication device determines that the data packet is successfully sent, it sends confirmation information ACK to the network device on the uplink control channel resource, and the ACK indicates that the data packet is successfully sent.
The communication device according to claim 20, wherein the sending module is further configured to:

When the communication device determines that the data packet has failed to be sent and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, sends instruction information to the N second communication devices, the instruction The information is used to indicate the end of sending the data packet;

Sending denial information NACK to the network device on the uplink control channel resource, where the NACK indicates that the data packet failed to be sent.
The communication device according to claim 20 or 21, wherein the N is equal to 1; the receiving module is further configured to:

After initially transmitting the data packet, an ACK for the data packet is received from the second communication device;

The processing module is also used to determine that the data packet is successfully sent; or,

The receiving module is further configured to receive the data packet from the second communication device after the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions ACK;

The processing module is also used to determine that the data packet is successfully sent.
The communication device according to claim 20 or 21, wherein the N is greater than 1, and the N second communication devices have the same group identifier;

The receiving module is further configured to, after initially transmitting the data packet, receive an ACK for the data packet from each of the N second communication devices;

The processing module is also used to determine that the data packet is successfully sent; or,

The receiving module is further configured to, after retransmitting the data packet and when the number of retransmissions for the data packet does not reach the maximum number of retransmissions, each second of the N second communication devices The communication device receives an ACK for the data packet;

The processing module is also used to determine that the data packet is successfully sent; or,

The processing module is further configured to determine when the communication device does not receive a NACK for the data packet from any one of the N second communication devices after initially transmitting the data packet The data packet is successfully sent; or,

The processing module is further configured to: after the data packet is retransmitted, the number of retransmissions for the data packet does not reach the maximum number of retransmissions, and the communication device does not change from the N second communication devices When any one of the second communication devices receives the NACK for the data packet, it determines that the data packet is successfully sent.
The communication device according to claim 20 or 21, wherein the N is equal to 1, and the receiving module is further configured to:

After initially transmitting the data packet, a NACK for the data packet is received from the second communication device;

The processing module is further configured to determine that the data packet fails to be sent; or

The receiving module is further configured to receive the data packet from the second communication device after the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions NACK;

The processing module is also used to determine that the data packet fails to be sent.
The communication device according to claim 20 or 21, wherein the N is greater than 1, and the N second communication devices have the same group identifier;

The receiving module is further configured to receive a NACK for the data packet from at least one of the N second communication devices after the data packet is initially transmitted;

The processing module is also used to determine that the data packet transmission fails; or

The receiving module is further configured to, after retransmitting the data packet and when the number of retransmissions for the data packet does not reach the maximum number of retransmissions, at least one second from the N second communication devices The communication device receives a NACK for the data packet;

The processing module is also used to determine that the data packet fails to be sent.
The communication device according to any one of claims 20 to 25, wherein the receiving module is further configured to:

Receiving side line configuration information from the network device, where the side line configuration information is used to instruct the communication device to apply a non-adaptive retransmission mode.
The communication device according to any one of claims 20 to 26, wherein the side schedule information includes at least one of the following information: the time-frequency resource for initial transmission of data packets, the retransmission Time interval, modulation and coding mode, new data indication, hybrid automatic retransmission HARQ process number, multiple input multiple output MIMO mode, uplink control channel resource indication and the identification of the communication device.
The communication device according to any one of claims 20 to 27, wherein the sending module is further configured to:

Sending a side scheduling request to the network device, where the side scheduling request is used to request the time-frequency resource for initial transmission of data packets.
A communication device, characterized in that it includes:

Acquisition module, used to acquire uplink control channel resources;

A receiving module, configured to receive a data packet that is transmitted or retransmitted by the first communication device;

A sending module, configured to send negative information NACK to the first communication device when the communication device fails to decode the data packet; or, when the communication device correctly decodes the data packet, at Acknowledgement information ACK is sent to the network device on the uplink control channel resource, and the ACK indicates that the data packet is successfully sent.
The communication device according to claim 29, wherein the receiving module is further configured to:

When the communication device fails to decode the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, receiving indication information from the first communication device, the indication information is used to Indicating the end of transmission of the data packet;

The sending module is further configured to send denial information NACK to the network device on the uplink control channel resource, where the NACK indicates that the data packet failed to be sent.
The communication device according to claim 29 or 30, characterized in that, in the case where the communication device correctly decodes the data packet, the sending module is further configured to:

Sending an ACK to the first communication device.
The communication device according to any one of claims 29 to 31, wherein the acquisition module is specifically configured to:

Obtain uplink control channel resources from the first communication device or the network device.
A network device, characterized in that it includes:

A sending module, configured to send downlink control information, the downlink control information including side scheduling information, the side scheduling information indicating uplink control channel resources and time-frequency resources for initial transmission of data packets between communication devices;

A receiving module, configured to receive acknowledgement information ACK sent on the uplink control channel resource;

The processing module is configured to release the time-frequency resource corresponding to the time-frequency resource for retransmitting the data packet.
The network device according to claim 33, wherein the receiving module is further configured to:

Receiving the denial information NACK sent on the uplink control channel resource, the NACK is sent at the end of the data packet transmission;

The processing module is configured to release the time-frequency resource corresponding to the time-frequency resource for retransmitting the data packet.
The network device according to claim 33 or 34, wherein the sending module is further configured to:

Side configuration information is sent, and the side configuration information is used to indicate that a non-adaptive retransmission mode is applied to data packets transmitted between the communication devices.
The network device according to claim 35, wherein the side configuration information further includes a retransmission interval and a maximum number of retransmissions.
The network device according to any one of claims 33 to 36, wherein the side schedule information includes at least one of the following information: the time-frequency resource for initial transmission of data packets, and the retransmission Time interval, modulation and coding mode, new data indication, hybrid automatic retransmission HARQ process number, multiple input multiple output MIMO mode, uplink control channel resource indication, and first communication device identification.
The network device according to any one of claims 33 to 37, wherein the receiving module is further configured to:

Receiving a scheduling request message, the scheduling request message is used to request the time-frequency resource for initial transmission of data packets between communication devices.
A computer-readable storage medium, characterized by comprising instructions, which when executed on a communication device, causes the communication device to perform the method according to any one of claims 1 to 13.
A computer-readable storage medium, characterized by comprising instructions, which when executed on a network device, causes the network device to perform the method according to any one of claims 14 to 19.