WO2019062555A1

WO2019062555A1 - Data transmission method and apparatus

Info

Publication number: WO2019062555A1
Application number: PCT/CN2018/105564
Authority: WO
Inventors: 卓义斌; 栗忠峰; 彭金磷
Original assignee: 华为技术有限公司
Priority date: 2017-09-30
Filing date: 2018-09-13
Publication date: 2019-04-04
Also published as: CN109600204B; CN109600204A

Abstract

Provided are a data transmission method and apparatus, relating to the technical field of communications, and used for reducing a transmission delay for a transmission packet and improving the reliability of data transmission. The method comprises: a first device sending a first data packet to a second device by means of a first carrier, wherein the second device is a receiving device for transmitted data, on a first carrier transmission path, of the first device, and the first carrier transmission path refers to an available path used, on the first carrier, for transmitting data from a base station to a user equipment; and when the first device determines a failure in the transmission of the first data packet, the first device sending a second data packet to a third device by means of a second carrier, wherein the third device is a receiving device for data, on the first carrier transmission path, of the second device or a receiving device for data after the data of the second device is transmitted by means of a relay, and the second data packet and the first data packet are data packets generated based on the same original data.

Description

Data transmission method and device

The present application claims the priority of the Chinese Patent Application, which is filed on Sep. 30, 2017, the entire disclosure of which is hereby incorporated by reference. .

Technical field

The embodiments of the present invention relate to the field of communications technologies, and in particular, to a data transmission method and apparatus.

Background technique

When a Hybrid Automatic Repeat Request (HARQ) is used in a Long Term Evolution (LTE) system, the receiving end uses an error detection code to detect whether the received data packet is in error. If there is no error, the receiving end will send an acknowledgement message (ACK) to the sender, and after receiving the ACK, the sender will send the next packet. If there is an error, the receiving end will send a negative acknowledgement message (NACK) to the sender. After receiving the NACK, the sender will initiate a packet retransmission.

In the relay communication process, there are three types of network element nodes, which are a base station, a relay device, and a user equipment. When using HARQ to transmit data during relay communication, it is desirable to support fast retransmission on another carrier for a packet that has not been successfully transmitted, which can greatly improve the performance of data transmission. In the prior art, the user equipment may receive downlink control information from the base station, where the downlink control information includes control information for cross-carrier HARQ transmission, and the cross-carrier HARQ transmission refers to the initial transmission and retransmission of the same HARQ process can be in different physical Performed on the carrier.

However, when the initial transmission and retransmission of the same HARQ process are performed on different physical carriers, if the carrier with a higher frequency is used for retransmission of the data packet, the transmission reliability is lowered because the high frequency coverage is limited; The use of a carrier with a lower frequency for retransmission of data packets results in a longer delay for retransmissions due to the fact that the low frequency has a longer slot period than the high frequency in the time domain.

Summary of the invention

The embodiment of the present invention provides a data transmission method and device, which solves the problem of large delay of data packet transmission and low reliability of data transmission in the prior art.

To achieve the above objective, the embodiment of the present application adopts the following technical solutions:

The first aspect provides a data transmission method, where the first device sends a first data packet to the second device by using the first carrier, and the second device is a receiving device for transmitting data of the first device on the first carrier transmission path, the first device The carrier transmission path refers to an available path for transmitting data from the base station to the user equipment on the first carrier; when the first device determines that the first data packet transmission fails, the first device sends the second device to the third device by using the second carrier. a data packet, the third device is a data receiving device of the second device on the first carrier transmission path or a data receiving device of the second device, and the second data packet and the first data packet are based on the same The data packet generated by the original data. In the foregoing technical solution, when the first data packet transmitted by the first device to the second device fails on the first carrier transmission path, the second data packet is sent to the third device by using the second carrier, and the second data packet is The first data packet is a data packet generated based on the same original data, that is, data retransmission is performed by means of cross-carrier cross-hopping, thereby reducing the transmission delay of the data packet and improving the reliability of data transmission.

In a possible implementation manner of the first aspect, the first device determines that the first data packet transmission fails, that the first device receives the negative acknowledgement message NACK sent by the second device, and determines that the first data packet transmission fails; or The first device does not receive the response feedback information within the preset duration, and determines that the first data packet transmission fails. In the above possible implementation manner, the first device may determine that the first data packet transmission fails by using different information, thereby implementing data retransmission to reduce the transmission delay of the data packet.

In a possible implementation manner of the first aspect, before the first device sends the second data packet to the third device by using the second carrier, the method further includes: the first device receiving the configuration information, where the configuration information is used to indicate the third The number of hops between the device and the first device. In the foregoing possible implementation manner, the first device may be a relay device, so that the first device may determine the third device by receiving the configuration information to send the second data packet to the third device.

In a possible implementation manner of the first aspect, the method further includes: the first device sends the first indication information to the third device, where the first indication information is used to indicate that the second data packet is the data transmitted on the first carrier. Retransmitted packets.

In a possible implementation manner of the first aspect, when the first device receives the negative acknowledgement message NACK sent by the second device, the method further includes: the first device sends the second indication information to the second device, and the second The indication information is used to instruct the second device to send the first received data packet to the third device, where the first received data packet is a data packet received by the second device after the first data packet is transmitted. In the foregoing possible implementation manner, the first device may improve the correct rate of the data decoded by the third device by instructing the second device to send the first received data packet to the third device, thereby reducing the number of retransmissions of the data packet and reducing the data. The transmission delay of the packet.

In a possible implementation manner of the first aspect, the HARQ process identifier of the first data packet is the same as the HARQ process identifier of the second data packet. Alternatively, the method further includes: the first device determines a first transmission time offset for transmitting the second data packet with respect to the first data packet, and transmits the first transmission time offset to the third device, the first transmission The time offset is used for the determination of the correspondence between the first data packet and the second data packet. In the foregoing possible implementation manner, by using the HARQ process identifier or the first transmission time offset, the third device may determine the correspondence between the first data packet and the second data packet, thereby helping to improve the verification success rate of the data packet. , thereby reducing the transmission delay of the data packet and improving the reliability of data transmission.

In a possible implementation manner of the first aspect, after the first device sends the second data packet to the third device by using the second carrier, the method further includes: receiving, by the first device, the acknowledgement that the third device sends by using the second carrier Answering the message ACK, the first device determines that the second data packet transmission is complete; the first device receives the negative acknowledgement message NACK sent by the third device by using the second carrier, and the first device sends the third data packet to the third device by using the second carrier. The third data packet and the first data packet are data packets generated based on the same original data. In the foregoing possible implementation manner, when the second data packet transmission fails, the first device may send the third data packet to the third device by using the second carrier to implement data retransmission.

In a second aspect, a data transmission method is provided, the method includes: receiving, by a second device, a first received data packet, where the first received data packet is a second device after the first data packet sent by the first device by using the first carrier is transmitted Receiving the data packet; when the second device determines that the first received data packet is an erroneous data packet, the second device sends a negative acknowledgement message NACK to the first device; the second device receives the first indication information sent by the first device, An indication information is used to instruct the second device to send the first received data packet to the third device, the second data packet and the first data packet are data packets generated based on the same original data, and the second device is configured according to the first indication information. The third device sends the first received data packet. In the foregoing technical solution, when the first device fails to transmit the first data packet sent by the first device to the second device on the first carrier transmission path, the first device instructs the second device to send the first received data packet to the third device, thereby The third device is configured to perform data decoding according to the first received data packet and the second received data packet, thereby improving reliability of data transmission, thereby reducing transmission delay of the data packet.

In a possible implementation manner of the second aspect, the process identifier of the second device that receives the first received data packet is the same as the process identifier of the first received data packet: or the method further includes: determining, by the second device, the sending Transmitting a second transmission time offset of the first data packet with respect to the first device, and transmitting the second transmission time offset to the third device, where the second transmission time offset is used for the first reception Determination of the correspondence between the data packet and the first data packet. In the foregoing possible implementation manner, by using the HARQ process identifier or the second transmission time offset, the third device may determine the correspondence between the first received data packet and the first data packet, thereby helping to improve the verification of the data packet. Rate, which in turn reduces the transmission delay of the packet and improves the reliability of data transmission.

A third aspect provides a data transmission method, the method comprising: receiving, by a third device, a second received data packet, where the second received data packet is a third device after the second data packet sent by the first device by using the second carrier is transmitted The received data packet, the second data packet and the first data packet are data packets generated based on the same original data, where the first data packet is a data packet sent by the first device to the second device by using the first carrier; Receiving, by the second device, the first received data packet, where the first received data packet is a data packet received by the second device after the first data packet is transmitted; the first received data packet and the second received data packet are used by the third device Data decoding. In the foregoing technical solution, when the first data packet transmitted by the first device to the second device fails on the first carrier transmission path, the second data packet is sent to the third device by using the second carrier, and the second data packet is The first data packet is a data packet generated based on the same original data, that is, data retransmission is performed by means of cross-carrier cross-hopping, thereby reducing the transmission delay of the data packet and improving the reliability of data transmission.

In a possible implementation manner of the third aspect, the method further includes: receiving, by the third device, first indication information that is sent by the first device, where the first indication information is used to indicate that the second data packet is transmitted on the first carrier Retransmission of data packets.

In a possible implementation manner of the third aspect, the method further includes: receiving, by the third device, a first transmission time offset sent by the first device, where the first transmission time offset is that the first device sends the second data And transmitting, by the first device, a transmission time offset of the second data packet, where the first transmission time offset is used for determining the correspondence between the first data packet and the second data packet.

In a possible implementation manner of the third aspect, the method further includes: receiving, by the third device, a second transmission time offset sent by the second device, where the second transmission time offset is that the second device sends the first receiving And a second transmission time offset is used for determining the correspondence between the first received data packet and the first data packet.

In the above two possible implementation manners, the third device may determine, by using the first transmission time offset and the second transmission time offset, a correspondence between the first received data packet and the second received data packet, thereby performing, according to the The data is decoded to improve the correct rate of the decoded data of the third device, thereby reducing the number of retransmissions of the data packet and reducing the transmission delay of the data packet.

In a possible implementation manner of the third aspect, the method further includes: when the third device determines that the second received data packet is correct, the third device sends an acknowledgement response message ACK to the first device by using the second carrier, and confirms the response. The message is used to indicate that the second data packet transmission is complete; when the third device determines that the second received data packet is an erroneous data packet, the third device sends a negative acknowledgement message NACK to the first device by using the second carrier, and the first device passes the first The third data packet sent by the two carriers, the third data packet and the first data packet are data packets generated based on the same original data.

In a further aspect of the present application, a first device is provided, the first device being used to implement the functions in the data transmission method provided by the foregoing first aspect or any one of the possible implementation manners of the first aspect, The functions can be implemented in hardware or in hardware by executing the corresponding software. The hardware or software includes one or more corresponding units of the above functions.

In a possible implementation, the first device includes a processor and a memory, where the memory stores code and data, and the memory is coupled to the processor, the processor is configured to support the user equipment to perform the first Aspect or data transmission method provided by any of the possible implementations of the first aspect. Optionally, the first device may further include a communication interface and a bus, and the communication interface is connected to the processor through the bus.

In a further aspect of the present application, a second device is provided, the second device is configured to implement the functions in the data transmission method provided by the foregoing first aspect or any one of the possible implementation manners of the first aspect, The functions can be implemented in hardware or in hardware by executing the corresponding software. The hardware or software includes one or more corresponding units of the above functions.

In a possible implementation, the structure of the second device includes a processor and a memory, where the code stores data and data, and the memory is coupled to the processor, the processor is configured to support the user equipment to perform the first Aspect or data transmission method provided by any of the possible implementations of the first aspect. Optionally, the second device may further include a communication interface and a bus, and the communication interface is connected to the processor through the bus.

In a further aspect of the present application, a third device is provided, the third device is configured to implement the functions in the data transmission method provided by the foregoing first aspect or any one of the possible implementation manners of the first aspect, The functions can be implemented in hardware or in hardware by executing the corresponding software. The hardware or software includes one or more corresponding units of the above functions.

In a possible implementation, the structure of the third device includes a processor and a memory, where the code stores data and data, and the memory is coupled to the processor, the processor is configured to support the user equipment to perform the first Aspect or data transmission method provided by any of the possible implementations of the first aspect. Optionally, the third device may further include a communication interface and a bus, and the communication interface is connected to the processor through the bus.

A still further aspect of the present application provides a computer readable storage medium having stored therein instructions that, when executed on a computer, cause the computer to perform the first aspect or the first aspect described above The data transmission method provided by any one of the possible implementations, or the data transmission method provided by any one of the foregoing second aspect or the second aspect, or the third aspect or the third aspect A data transmission method provided by any of the possible implementations.

In a further aspect of the present application, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the data provided by any of the above first aspect or any of the possible implementations of the first aspect a transmission method, or a data transmission method provided by any one of the foregoing possible implementations of the second aspect or the second aspect, or the data provided by any one of the foregoing third or third possible implementations Transmission method.

In a further aspect of the present application, a communication system is provided, the communication system comprising a plurality of devices, the plurality of devices including a first device, a second device, and a third device; wherein the first device is provided by the above aspects a first device, configured to support the first device to perform the data transmission method provided by any one of the foregoing first aspect or the first aspect, and/or the second device is provided by the foregoing aspects a device for supporting a third device to perform the data transmission method provided by any one of the foregoing second aspect or the second aspect, and/or the third device is the third device provided by the foregoing aspects, A data transmission method for supporting a third device to perform any of the above-mentioned third aspect or any possible implementation of the third aspect.

It can be understood that the apparatus, computer storage medium or computer program product of any of the data transmission methods provided above is used to perform the corresponding method provided above, and therefore, the beneficial effects that can be achieved can be referred to the above. The beneficial effects in the corresponding methods provided are not described here.

DRAWINGS

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

FIG. 2 is a schematic structural diagram of a base station/relay device according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a user equipment according to an embodiment of the present disclosure;

4 is a schematic flowchart of a data transmission method according to an embodiment of the present application;

FIG. 5 is a schematic flowchart diagram of another data transmission method according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of transmission of a data packet according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a first device according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of another first device according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of a second device according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of another second device according to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram of a third device according to an embodiment of the present disclosure;

FIG. 12 is a schematic structural diagram of another third device according to an embodiment of the present disclosure.

Detailed ways

In the Long Term Evolution (LTE) system, user equipment has higher and higher requirements for the rate and reliability of data transmission. In the LTE system, the high-frequency carrier is usually used for communication, and the high-frequency carrier is unstable in the communication process, which easily causes coverage holes due to occlusion, resulting in data transmission failure, thereby affecting data transmission reliability. However, by mixing the Hybrid Automatic Repeat Request (HARQ) mechanism, data that is lost or erroneous in the transmission process of the LTE system can be retransmitted, thereby improving the reliability of data transmission.

When the LTE system uses the HARQ mechanism to transmit data packets, the receiving end (for example, the relay device or the user equipment) uses an error detection code to detect whether the received data packet is in error. For example, the receiving end can usually pass the cyclic redundancy check. (Cyclic Redundancy Check, CRC) checks the received packets. If the data packet is error-free, the receiving end sends an acknowledgement response message (ACK) to the sending end (for example, the base station or the relay device). After receiving the ACK, the transmitting end sends the next data packet. If the data packet is in error, the receiving end saves the received error data packet in a HARQ buffer and sends a negative acknowledgement message (NACK) to the sender. After receiving the NACK, the sender initiates the data packet. Retransmission, so that the receiving end can softly combine with the data packet in the HARQ buffer when receiving the retransmitted data packet, and obtain the data through decoding. In the LTE system, each user equipment has its own HARQ entity on each carrier unit, and each HARQ entity may include multiple parallel HARQ processes, and each HARQ process has a corresponding HARQ buffer pair reception at the receiving end. The packets arrived are soft merged. Since the LTE system is in the process of communication, the data packet usually needs to be transmitted through multiple relay devices, so that the transmission delay of the data packet is large. When the HARQ mechanism is used for data packet retransmission, if a data packet fails to be transmitted for the first time, And multiple retransmissions occur, which further increases the transmission delay of the data packet.

Based on this, the embodiment of the present application provides a data transmission method and apparatus. The technical solution provided by the present application can be applied to a communication system including multiple relay devices and using a HARQ mechanism for data packet transmission, for example, an existing communication system, a fifth generation (5G) communication system, and a future evolution system or more Communication fusion systems and so on.

FIG. 1 is a schematic structural diagram of a communication system according to an embodiment of the present disclosure. Referring to FIG. 1, the communication system includes a base station 101, a relay device 102, and a user equipment 103. The base station 101 may be an evolved Node B (eNodeB), a Node B (NodeB), a macro base station, an access point device, and a Transit Reception Point (TRP), and the like. For the base station. The relay device 102 may be a relay device station, an access point device, a micro base station, a TRP, etc., and is referred to as a relay device in the embodiment of the present application. The user equipment 103 may be a handheld device, an in-vehicle device, a wearable device, a computing device, a mobile station, a mobile station, a wireless communication device, a terminal, and the like. For convenience of description, the present application is collectively referred to as a user equipment.

The link between the base station 101 and the relay device 102 and the relay device 102 and the relay device 102 may be referred to as a backhaul link (BL), and the relay device 102 and the user equipment 103 The link between them can be called an Access Link (AL). On the transmission path between the base station 101 and the user equipment 103, the link whose direction is the same as the direction from the base station 101 to the user equipment 103 may be referred to as a downlink, and the link whose direction is the same as the direction from the user equipment 103 to the base station 101 may be referred to as a link. Uplink.

FIG. 2 is a schematic structural diagram of a base station/relay device according to an embodiment of the present disclosure. The base station/relay device may include a Baseband Processing Unit (BBU) 201 and a remote radio module (Remote). Radio Unit (RRU) 202, RRU 202 and antenna feeder system 203 are connected, and BBU 201 and RRU 202 can be used as needed. The structure shown in FIG. 2 may be a structure of a base station or a structure of a relay device. The BBU 201 is used to implement operation and maintenance of the entire base station or the relay device, implement signaling processing, radio resource management, and a transmission interface to the packet core network, and implement physical layer, medium access control layer, L3 signaling, and operation and maintenance. Control function. The RRU 202 is used to implement conversion between a baseband signal and a radio frequency signal, and realizes demodulation of a wireless received signal, modulation of a transmission signal, and power amplification. The antenna feeder system 203 can include a plurality of antennas for enabling reception and transmission of wireless air interface signals. It can be understood by those skilled in the art that in a specific implementation process, the base station/relay device can also adopt other general hardware structures, and is not limited to the hardware structure shown in FIG. 2.

FIG. 3 is a schematic structural diagram of a user equipment according to an embodiment of the present disclosure. The mobile device may include an RF (radio frequency) circuit 310, a memory 320, and other input devices 330. Components such as display 340, sensor 350, audio circuit 360, I/O subsystem 370, processor 380, and power supply 390. The following describes the components of the mobile phone in detail with reference to FIG. 3:

The processor 380 is connected to the RF circuit 310, the memory 320, the audio circuit 360, and the power supply 390, respectively. I/O subsystem 370 is coupled to other input devices 330, display 340, and sensor 350, respectively. The RF circuit 310 can be used for receiving and transmitting signals during the transmission and reception of information or during a call. In particular, after receiving the downlink information of the base station, the processing is performed by the processor 380. Memory 320 can be used to store software programs as well as modules. The processor 380 executes various functional applications and data processing of the handset by running software programs and modules stored in the memory 320. Other input devices 330 can be used to receive input numeric or character information, as well as generate key signal inputs related to user settings and function controls of the handset. The display screen 340 can be used to display information input by the user or information provided to the user as well as various menus of the mobile phone, and can also accept user input, and the display screen 340 can include the display panel 341 and the touch panel 342. Sensor 350 can be a light sensor, a motion sensor, or other sensor. Audio circuitry 360 can provide an audio interface between the user and the handset. The I/O subsystem 370 is used to control external devices for input and output, and the external devices may include other device input controllers, sensor controllers, and display controllers. The processor 380 is the control center of the handset, which connects various portions of the entire handset using various interfaces and lines, by executing or executing software programs and/or modules stored in the memory 320, and invoking data stored in the memory 320, The phone's various functions and processing data, so that the overall monitoring of the phone. A power source 390 (such as a battery) is used to power the various components described above. Preferably, the power source can be logically coupled to the processor 380 through a power management system to manage functions such as charging, discharging, and power consumption through the power management system.

Although not shown, the mobile phone may also include functional modules or devices such as a camera and a Bluetooth module, and details are not described herein. It will be understood by those skilled in the art that the structure of the handset shown in FIG. 3 does not constitute a limitation to the handset, and may include more or less components than those illustrated, or some components may be combined, or different component arrangements.

FIG. 4 is a schematic flowchart of a data transmission method according to an embodiment of the present application. Referring to FIG. 4, the method is applied to the communication system shown in FIG. 1, and the method includes the following steps.

S401: The first device sends the first data packet to the second device by using the first carrier, where the second device is the receiving device for transmitting data of the first device on the first carrier transmission path, where the first carrier transmission path refers to the first carrier. An available path for transmitting data from a base station to a user equipment.

Among them, the carrier refers to a radio wave having a certain frequency range, in Hertz (Hz). A carrier can be described by a center frequency and a bandwidth, for example, a center frequency of 500 Hz, and a carrier having a bandwidth of 100 Hz refers to a radio wave having a frequency range of 450 Hz to 550 Hz. A carrier can also be referred to as a carrier frequency, a carrier frequency, a carrier unit, or a bandwidth portion.

The first carrier refers to a carrier used for data transmission between the base station and the user equipment, and the first carrier may be configured by the base station. The first carrier transmission path refers to an available path on the first carrier for transmitting data from the base station to the user equipment. The second device may be a receiving device that transmits data of the first device on the first carrier transmission path, that is, the data that is sent by the first device on the first carrier transmission path is received by the second device, where the second device may be referred to as the first device. The next hop device, the lower node, or the downstream node of the device. The first device is also referred to as the previous hop device, the upper node, or the upstream node of the second device. Optionally, both the start point and the end point of the first carrier transmission path may be the base station, or the start point and the end point of the first carrier transmission path may be user equipment, or the start point and the end point of the first carrier transmission path may also be other communications. The device is not specifically limited in this example.

In addition, the first device may be a base station or a relay device in the communication system, and the second device may be a relay device. When the first device is a base station, the first device is the first device on the first carrier transmission path, and the first carrier transmission path includes at least three devices. When the first device is a relay device, the first device may be a device located between the base station and the user equipment on the first carrier transmission path (for example, a second device or a third device after the base station, etc.), and At least four devices are included in one carrier transmission path.

S402: When the first device determines that the first data packet transmission fails, the first device sends the second data packet to the third device by using the second carrier, where the first data packet and the second data packet are data generated based on the same original data. package.

The second carrier is a carrier between the first device and the third device for carrying transmission data. The third device is a receiving device for transmitting data of the second device on the first carrier transmission path, that is, the data sent by the second device on the first carrier transmission path is directly received by the third device; or the third device is the first carrier transmission The receiving device of the data of the second device on the path after the relayed data, that is, the data transmitted by the second device on the first carrier is transmitted by one or more relay devices, and then the relay device transmits the relay transmission. After the data. Here, the third device may be referred to as a lower N hop device of the second device or a lower N tier node, and N is an integer greater than or equal to 1. The third device may be a relay device or a user device.

The frequency of the second carrier is lower than the frequency of the first carrier, which means that the frequency range corresponding to the second carrier is lower than the frequency range corresponding to the first carrier. For example, the frequency of the second carrier is 1900 to 1920 Hz, and the frequency of the first carrier is 2300 to 2400 Hz.

In addition, the first data packet may be an initial data packet or a retransmission data packet. When the first data packet is an initial data packet, the second data packet may be referred to as a retransmission data packet of the first data packet, and the retransmission data packet may be the same redundant version as the initial data packet, or may be an initial data packet. Different versions of the data packets are transmitted. In addition, the first data packet and the second data packet may be a transport block (TB), a code block (CB), or a code block group composed of multiple CBs in the LTE system (Code Block Group) , CBG) and so on.

Further, the second data packet may be part of the data of the first data packet. For example, the first data packet is a data packet consisting of multiple CBGs or CBs. When the first device sends the first data packet to the second device by using the first carrier, when the first device determines that the first data packet transmission fails. In the first data packet, only part of the CBG or part of the CB has a transmission error, and the remaining part of the CBG or part of the CB is successfully transmitted. Therefore, when the first device sends the second data packet to the third device through the second carrier, the second data packet It may be a partial CBG or a part of CB that transmits only the above transmission error.

Specifically, the first device determines that the first data packet transmission fails, and may include the following two situations: the first device receives the negative acknowledgement message NACK sent by the second device, and determines that the first data packet transmission fails; or, the first The device does not receive the response feedback information sent by the second device within the preset duration, and determines that the first data packet transmission fails.

The first type, the first device receives the negative acknowledgement message NACK sent by the second device, and determines that the first data packet transmission fails.

After the first device sends the first data packet to the second device by using the first carrier, when the second device receives the first received data packet, the second device may perform information bit verification on the first received data packet, where The received data packet is a data packet received by the second device after the first data packet is transmitted. For example, the second device may perform a CRC check or other check mode check on the first received data packet. If the first received data packet is verified, it indicates that the first data packet is transmitted correctly, and the second device may send an acknowledgement response message ACK to the first device, so that the first device determines that the first data packet transmission is completed after receiving the ACK. If the first received data packet verification fails, indicating that the first data packet transmission is in error, the second device may determine that the first received data packet is an erroneous data packet, thereby sending a negative acknowledgement message NACK to the first device, where the first device After receiving the NACK, the first device determines that the first data packet transmission fails.

The second device does not receive the response feedback information within the preset time period, and determines that the first data packet transmission fails.

After the first device sends the first data packet to the second device by using the first carrier, the first data packet may be lost during the transmission process, and the second device does not receive any data packet, so that the second device does not go to the first device. Send any response feedback. Therefore, the first device does not receive the response feedback information sent by the second device within the preset duration, and the first device may determine that the first data packet transmission fails. The preset duration may be set in advance, or may be configured by using the high layer signaling, which is not specifically limited in this embodiment of the present application.

Further, when the first device does not receive the response feedback information within the preset duration, but receives the beam failure information sent by the second device, or the first device receives the multiple beam failure information sent by the second device multiple times in succession. The first device may determine that the communication quality of the communication link between the first device and the second device is poor according to the beam failure request information, thereby determining that the first data packet transmission fails. Alternatively, the first device receives the link failure information sent by the second device, and determines that the first data packet transmission fails.

S403: The third device receives the second received data packet, where the second received data packet is a data packet received by the third device after the second data packet sent by the first device by using the second carrier is transmitted.

When the first device sends the second data packet to the third device by using the second carrier, the third device receives the second received data packet, and the second received data packet is after the second data packet sent by the first device is transmitted. The data packet received by the third device. Afterwards, the third device may perform information bit check on the received second received data packet, and if the second received data packet is verified to be error-free, the second data packet is successfully transmitted; if the second received data packet is verified to be in error, Then the second packet transmission fails.

Further, when the third device checks that the second received data packet is correct, the third device may send an ACK to the first device by using the second carrier, and the first device receives the ACK sent by the third device, and determines the second data packet transmission. carry out. The third device may send a NACK to the first device by using the second carrier, and the first device receives the NACK sent by the third device, and determines that the second data packet transmission fails. The first device may send the third data packet to the third device by using the second carrier, where the third data packet and the first data packet are data packets generated based on the same original data, so that the third device receives the data packet by using the data packet retransmission. Transfer data correctly.

The third data packet may be referred to as a retransmission data packet, and the third data packet may be the same as the initial data packet, or may be a different redundancy version of the initial data packet. In addition, the third data packet may also be a transport block (TB), a code block (CB), or a code block group (CBG) composed of multiple CBs in the LTE system. .

In the embodiment of the present application, when the first data packet transmission by the first device to the second device by using the first carrier fails, the first device may send the second data packet to the third device by using the second carrier, where the third device Receiving a second received data packet, where the second received data packet is a data packet received by the third device after the second data packet is transmitted, and the second data packet is generated based on the same original data as the first data packet, The second device is the next hop device of the first device on the first carrier transmission path, and the third device is the next N hop device of the second device on the first carrier transmission path, so that the cross-carrier cross-hop can be used when the data packet transmission fails. The method of data retransmission is to reduce the transmission delay of the data packet while ensuring the reliability of data transmission.

Further, before S402, that is, before the first device sends the second data packet to the third device by using the second carrier, the method further includes: S4011-S4012.

S4011: The first device sends, to the third device, resource indication information, where the resource indication information is used to indicate a transmission resource between the first device and the third device, where the transmission resource includes an uplink resource and/or a downlink resource on the second carrier. .

The resource indication information may be Downlink Control Information (DCI). The resource indication information that is sent by the first device to the third device for indicating the transmission resource may include only the uplink resource on the second carrier, or only the downlink resource on the second carrier, or the uplink resource on the second carrier. And downstream resources. The uplink resource is used by the third device to send the response feedback information to the first device, and is used by the first device to receive the response feedback information, for example, for the third device to send an ACK or a NACK, and for the first device to receive the ACK or NACK. The downlink resource is used by the first device to send a data packet to the third device, and the third device receives the data packet, for example, sending the second data packet or the third data packet.

In addition, the first device may send the resource indication information to the third device by using the first carrier, or may send the resource indication information to the third device by using the second carrier. Since the frequency of the second carrier is lower than the frequency of the first carrier, the first carrier is an initial carrier for data transmission between transmission devices, and the second carrier is a new carrier for transmission between transmission devices, where the first carrier can be called For the original high frequency carrier, the second carrier is called a retransmission low frequency carrier. Correspondingly, the first device may send the resource indication information to the third device by using the original high-frequency carrier, or may send the resource indication information to the third device by retransmitting the low-frequency carrier, which is not specifically limited in this embodiment.

S4012: The third device receives the first device sending resource indication information.

When the third device receives the resource indication information sent by the first device, the third device may determine, according to the resource indication information, a transmission resource between the first device and the third device. Specifically, when the transmission resource includes only the uplink resource, the third device may determine, according to the resource indication information, an uplink resource used to send the response feedback information to the third device. When the transmission resource includes only the downlink resource, the third device may determine, according to the resource indication information, a downlink resource used for receiving the data packet sent by the first device. When the transmission resource includes the downlink resource, the third device may determine, according to the resource indication information, an uplink resource for sending the response feedback information to the third device, and a downlink resource for receiving the data packet sent by the first device.

Further, before S402, that is, before the first device sends the second data packet to the third device by using the second carrier, when the first device is the relay device, the method may further include: S4013. The step of configuring the hop count between the first device and the third device and the step of configuring the transmission resource between the first device and the third device may be performed in no particular order. order.

S4013: The first device receives configuration information, where the configuration information is used to indicate a hop count between the third device and the first device.

The first device may receive configuration information sent by the base station, where the first device is a relay device, that is, the first device is a transmission device between the base station and the user equipment in the first carrier transmission path, where the configuration information may be Any one of signaling control, MAC Control Element signaling, Radio Resource Control (RRC) signaling, and Downlink Control Information (DCI) of the media access control layer For the first device. In addition, the hop count between the third device and the first device may also be predefined, that is, the hop count between the first device and the third device is set in advance.

In addition, the hop count between the third device and the first device may be indicated by a value specifically indicating the hop count, may be indicated by the number of relay devices, or may be indicated by an identifier of at least one relay device. When indicated by a numerical value indicating the hop count, the value may refer to a specific hop count of the third device from the first device, for example, three hops or four hops. When the number of the relay device is indicated, the number may be that the third device is the number of devices from the first device. For example, if the third device is the second device from the first device, the number may be Is 2. When indicated by the identity of a relay device, the identity may be the identity of the third device. When indicated by the identifiers of the plurality of relay devices, the plurality of identifiers may be an identifier of the relay device between the first device and the third device, including an identifier of the third device.

Specifically, the first device may receive the configuration information sent by the base station, where the configuration information is used to indicate the hop count between the third device and the first device, so that when the first device determines that the first data packet transmission fails, the first device The device may determine the third device according to the hop count indicated by the configuration information, and send the second data packet to the third device by using the second carrier to transmit the second data packet by means of hopping. Optionally, the hop-by-hop mode may be characterized by a link relationship between the first device and the third device, where at least two links in the first carrier transmission path are required between the first device and the third device (ie, The first device is not adjacent to the third device, and the link refers to a connection between two adjacent transmission devices. For example, the number of links between the first device and the third device may characterize the number of hops between the third device and the first device. The link here may be an access downlink, a backhaul downlink, or a side link (Sidelink).

Further, referring to FIG. 5, after S402, the method further includes: S404-S406. The S404-S406 and the S402-S403 may be in no particular order, that is, the third device may receive the first received data packet first, then receive the second received data packet, or receive the second received data packet first, and then receive the second received data packet. In the first receiving data packet, or receiving the first receiving data packet and the second receiving data packet at the same time, in FIG. 5, the third device first receives the first received data packet and then receives the second received data packet as an example. Description.

S404: The first device sends the second indication information to the second device, where the second indication information is used to instruct the second device to send the first received data packet to the third device.

When the first device receives the negative acknowledgement message NACK sent by the second device, and determines that the first data packet fails to be transmitted, the first device may instruct the second device to send the first received data packet to the third device, that is, instruct the second The device sends the received error data packet to the third device, so that the first device can send the second indication information to the second device.

Further, when the first device receives the negative acknowledgement message NACK sent by the second device, determining that the first data packet transmission fails, the first device may instruct the second device to send the partial data packet of the first received data packet to the third device. That is, the second device is instructed to send a partial data packet of the received error data packet to the third device, and the second device may send part of the data of the received error data packet to the third device. For example, in the case that the first data packet is a data packet consisting of multiple CBGs or CBs, some CBG/CB sends errors during the first device sending the first data packet to the second device by using the first carrier, but still exists. The partial CBG/CB can be correctly decoded, so that when the first device transmits the second data packet to the third device through the second carrier, the correctly decoded partial CBG/CB can be forwarded to the third device. And the steps based on partial CBG/CB forwarding can be decoupled from other embodiments.

Optionally, the second indication information may be that the first device sends the information to the second device by using any one of MAC-CE signaling, RRC signaling, and physical layer DCI.

S405: When the second device receives the second indication information, the second device sends the first received data packet to the third device according to the second indication information.

S406: The third device receives the first received data packet sent by the second device, where the first received data packet and the second received data packet are used for data decoding of the third device.

When the third device receives the first received data packet sent by the second device, the third device may combine the first received data packet and the second received data packet, and then perform information bit check on the merged data packet. . The merge here may also be referred to as soft merge, and the soft merge method may include Incremental Redundancy (IR) merge or Chase Combining (CC) merge. The first received data packet and the second received data packet are used for data decoding of the third device, where data decoding may refer to converting a digital sequence in the data packet into an information process, for example, data decoding may include demodulation and decoding. Any one or more of the embodiments of the present application are not specifically limited thereto.

In addition, the third device may merge the first received data packet and the second received data packet by a soft combining manner of a predefined or higher layer signaling configuration, or may be merged by a default soft combining manner. The high layer signaling may be any one of MAC-CE signaling, RRC signaling, and DCI. Optionally, the default soft merge mode can be CC merge.

Exemplarily, since the frequency of the first carrier is greater than the frequency of the second carrier, the first carrier is referred to herein as a high frequency carrier, and the second carrier is referred to as a low frequency carrier. When the first data packet is the initial data packet, the step of transmitting the first data packet by the first device to the second device by using the first carrier is called a high frequency initial transmission, and the second device determines that the first data packet transmission fails to the first device. The step of sending an NCAK message is called high frequency NACK feedback. The step of the first device transmitting the second data packet to the third device by using the second carrier is referred to as low frequency cross-carrier cross-hop retransmission, and the step of the third device transmitting the response feedback information to the first device is called low frequency cross-hop feedback, and the data is The transmission of the packet can be as shown in Figure 6. The fourth device in FIG. 6 refers to the next hop device of the third device in the first carrier transmission path from the base station to the user equipment transmission direction. After determining that the second data packet is successfully transmitted, the third device may send the second data packet to the fourth device by using the first carrier. If the third device successfully transmits the data packet to the fourth device, the fourth device continues to transmit to the user equipment by using the first carrier transmission path; if the third device fails to transmit the data packet to the fourth device, the third device may A device is similar in that a data packet is transmitted to a second N-hop device of a fourth device through a second carrier. And so on, until the packet is successfully transmitted to the user device.

Further, in order to implement the merging between the first received data packet and the second received data packet, the correspondence between the first received data packet and the second received data packet may be indicated, and the specific indication manner may be implemented in the following two manners. To achieve, as described below.

In the first manner, the correspondence between the first received data packet and the second received data packet is indicated by the HARQ process identifier corresponding to the data packet.

The HARQ process identifier for sending a data packet is the same as the HARQ process identifier of the first data packet, that is, the HARQ process identifier of the first device that sends the first data packet is the same as the HARQ process identifier of the second device that receives the first received data packet. And the HARQ process identifier that the first device sends the second data packet is the same as the HARQ process identifier that the third device receives the second received data packet. Therefore, when the first device sends the first data packet and the second data packet, the same HARQ process identifier can be used. At the same time, the second device may also use the same HARQ process identifier as the first received data packet when receiving the first received data packet and transmitting the first received data packet. In this way, the third device receives the first received data packet and the HARQ process identifier that receives the second received data packet, so that the third device can store the first received data packet and the second received data packet in the same HARQ buffer, thereby implementing Merging between the first received data packet and the second received data packet.

Optionally, the first device uses different HARQ process identifiers when sending the second data packet and sending the first data packet, and the second device sends the first HARQ process identifier and the first used when receiving the first data packet to the third device. The HARQ process identifier used by the device to send the second data packet is the same, so that the third device receives the first received data packet and the HARQ process identifier that receives the second received data packet.

In the second mode, the correspondence between the first received data packet and the second received data packet is indicated by a transmission time offset (Timing) corresponding to the data packet.

The first transmission time offset of the first data packet sent by the first device relative to the first device, and the first data packet sent by the second device to the first device may be sent by the first device. a second transmission time offset of the packet to indicate a correspondence between the first received data packet and the second received data packet.

In addition, the first transmission time offset and the second transmission time offset may be relative time offsets or absolute time offsets. The relative time offset may be an offset relative to a subframe, a slot, or a symbol. The indication of the absolute time offset may be used to indicate a specific frame, subframe, time slot or symbol in which the first device transmits the first data packet.

Specifically, the first device may determine a first transmission time offset for transmitting the first data packet with respect to the second data packet, and send the first transmission time offset to the third device. The second device may determine a second transmission time offset for transmitting the first received data packet with respect to the first device, and send the second transmission time offset to the third device, so that the third device may Determining a transmission time of one first data packet according to the first transmission time offset, and determining a transmission time of another first data packet according to the second transmission time offset. When the transmission times of the two first data packets are the same, the third device may determine a correspondence between the first received data packet and the second received data packet, thereby implementing between the first received data packet and the second received data packet. Merger.

Further, after the first device sends the second data packet to the third device by using the second carrier, the first device may further send the first indication information to the third device, where the first indication information is used to indicate that the second data packet is A retransmission packet of data transmitted on a carrier.

The first indication information may be sent by using any one of MAC-CE signaling, RRC signaling, and physical layer DCI. When the first device sends the first indication information to the third device, the first device may send the first indication information to the third device by using the first carrier, or may send the first indication information to the third device by using the second carrier, the application The embodiment does not limit this.

Specifically, when the first device sends the first indication information to the third device by using the DCI, the first device may multiplex the carrier indicator field in the DCI to send the first indication information. In addition, a first identifier (eg, a number) may be predefined for the first carrier, and the first carrier is indicated by the identifier. Further, when the first device sends the first indication information to the third device, the first device may also indicate by using the HARQ entity identifier used when the first data packet is transmitted. In addition, it can also be indicated by the transmission link identifier used when the first data packet is transmitted.

Correspondingly, after the third device performs soft combining on the first received data packet and the second received data packet, the third device may perform information bit verification on the combined data packet, and send the information to the first device according to the verification result. Answer feedback information. Specifically, when the merged data packet is verified, the third device sends an acknowledgement response message ACK to the first device by using the second carrier, where the ACK is used to indicate that the second data packet transmission is complete. When the combined data packet verification fails, the third device may send a NACK to the first device by using the second carrier, where the ACK is used to indicate that the second data packet transmission fails, so that the first device can pass the NACK when receiving the NACK. The second carrier sends the third data packet to the third device, that is, the correct transmission data received by the third device by the data packet retransmission on the second carrier.

In the embodiment of the present application, the first device sends the first received data packet to the third device by instructing the second device, so that the third device can softly merge the first received data packet when receiving the first received data packet. And the second receiving data packet, and performing information bit verification on the combined data packet, thereby improving the verification success rate of the data packet, reducing the number of data packet retransmissions, and thereby improving the reliability of data transmission.

The solution provided by the embodiment of the present application is mainly introduced from the perspective of interaction between the network elements. It can be understood that each network element, such as the first device, the second device, and the third device, in order to implement the above functions, includes corresponding hardware structures and/or software modules for performing the respective functions. Those skilled in the art will readily appreciate that the present application can be implemented in a combination of hardware or hardware and computer software in conjunction with the network elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

The embodiment of the present application may divide the function module by using the first device, the second device, and the third device according to the foregoing method example. For example, each function module may be divided according to each function, or two or more functions may be integrated. In a processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of the module in the embodiment of the present application is schematic, and is only a logical function division, and the actual implementation may have another division manner.

FIG. 7 is a schematic diagram of a possible structure of the first device involved in the foregoing embodiment, where the first device includes: a sending unit 701, a processing unit 702, and receiving. Unit 703. The sending unit 701 is configured to support the first device to perform S401-S402 in FIG. 4, steps S401-S402 and S404 in FIG. 5, and send the first indication information to the third device or send the first transmission time offset. The processing unit 702 is configured to support the first device to perform the step of determining that the first data packet transmission fails, or the step of determining the first transmission time offset; and the receiving unit 703 is configured to support the first device to perform the step of receiving the configuration information. And receiving the ACK or NACK sent by the second device or the third device.

In hardware implementation, the processing unit 702 may be a processor; the sending unit 701 may be a transmitter, the receiving unit 703 may be a receiver, and the receiver and the transmitter may constitute a communication interface.

FIG. 8 is a schematic diagram showing a possible logical structure of a first device involved in the foregoing embodiment provided by an embodiment of the present application. The first device includes a memory 801 and a processor 802 for storing codes and data of the first device. In the embodiment of the present application, the processor 802 is configured to perform control management on the action of the first device, for example, the processor 802 is configured to support the first device to perform a step of determining that the first data packet transmission fails, or determine the first The step of transmitting a time offset, and/or other processes for the techniques described herein. Optionally, the first device may further include a communication interface 803 and a bus 804. The processor 802, the communication interface 803, and the memory 801 are connected to each other through a bus 804. The communication interface 803 is configured to support the first device to perform communication.

The processor 802 can be a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, combinations of digital signal processors and microprocessors, and the like. The bus 804 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 8, but it does not mean that there is only one bus or one type of bus.

FIG. 9 is a schematic diagram showing a possible structure of a second device involved in the foregoing embodiment, where the second device includes: a receiving unit 901, a sending unit 902, and processing. Unit 903. The receiving unit 901 is configured to support the step of the second device receiving the first data packet sent by S401 in FIG. 4 or FIG. 5, and the step of receiving the second indication information sent by S404 in FIG. 5; the sending unit 902 is configured to support The second device performs S405 in FIG. 5 and the step of transmitting a second transmission time offset to the third device; the processing unit 903 is configured to support the second device to determine whether the first received data packet transmission is correct or incorrect, and determine The second transmission time offset step.

In hardware implementation, the processing unit 903 may be a processor; the sending unit 902 may be a transmitter, the receiving unit 901 may be a receiver, and the receiver and the transmitter may constitute a communication interface.

FIG. 10 is a schematic diagram showing a possible logical structure of a second device involved in the foregoing embodiment provided by an embodiment of the present application. The second device includes a memory 1001 and a processor 1002 for storing program codes and data of the second device. In the embodiment of the present application, the processor 1002 is configured to perform control management on the action of the second device, for example, the processor 1002 is configured to support the second device to determine that the first received data packet is transmitted correctly or incorrectly, and determine the first The second transmission time offset step, and/or other processes for the techniques described herein. Optionally, the second device may further include a communication interface 1003 and a bus 1004. The processor 1002, the communication interface 1003, and the memory 1001 are connected to each other through a bus 1004. The communication interface 1003 is configured to support the second device to perform communication.

The processor 1002 can be a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, combinations of digital signal processors and microprocessors, and the like. The bus 1004 may be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus or the like. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in FIG. 10, but it does not mean that there is only one bus or one type of bus.

FIG. 11 is a schematic diagram showing a possible structure of a third device involved in the foregoing embodiment, where the third device includes: a receiving unit 1101, a sending unit 1102, and a processing. Unit 1103. The receiving unit 1101 is configured to support the third device to perform the step S403 in FIG. 4 or FIG. 5, the step of receiving the first indication information sent by the first device, the step of receiving the first received data packet sent by the second device, or receiving a first transmission time offset sent by the first device and a second transmission time offset sent by the second device; the sending unit 1102 is configured to support the third device to send an ACK or a NACK to the first device; The unit 1103 is configured to support the third device to determine that the second received data packet is transmitted correctly or incorrectly.

In hardware implementation, the processing unit 1103 may be a processor; the receiving unit 1101 may be a receiver, the sending unit 1102 may be a transmitter, and the receiver and the transmitter may constitute a communication interface.

FIG. 12 is a schematic diagram showing a possible logical structure of a third device involved in the foregoing embodiment provided by an embodiment of the present application. The third device includes a memory 1201 and a processor 1202 for storing program codes and data of the third device. In the embodiment of the present application, the processor 1202 is configured to perform control management on the action of the third device, for example, the processor 1202 is configured to support the third device to determine that the second received data packet is transmitted correctly or incorrectly, and/or Other processes for the techniques described herein. Optionally, the third device may further include a communication interface 1203 and a bus 1204. The processor 1202, the communication interface 1203, and the memory 1201 are connected to each other through a bus 1204. The communication interface 1203 is configured to support communication by the third device.

The processor 1202 can be a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, combinations of digital signal processors and microprocessors, and the like. The bus 1204 may be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus or the like. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 12, but it does not mean that there is only one bus or one type of bus.

In another embodiment of the present application, there is also provided a readable storage medium, wherein the readable storage medium stores computer execution instructions, when a device (which may be a single chip microcomputer, a chip, etc.) or a processor executes FIG. 4 or FIG. 5 The steps of the first device, the second device, or the third device in the provided data transmission method. The aforementioned readable storage medium may include various media that can store program codes, such as a USB flash drive, a removable hard disk, a read only memory, a random access memory, a magnetic disk, or an optical disk.

In another embodiment of the present application, there is also provided a computer program product comprising computer executed instructions stored in a computer readable storage medium; at least one processor of the device may be Reading the storage medium reads the computer execution instructions, and the at least one processor executes the computer to execute the instructions such that the device implements the steps of the first device, the second device, or the third device in the data transmission method provided in FIG. 4 or FIG. 5.

In another embodiment of the present application, a communication system is further provided, the communication system including a plurality of devices including a first device, a second device, and a third device. The first device may be the first device provided in FIG. 7 or FIG. 8 and used to perform the steps of the first device in the data transmission method provided in FIG. 4 or FIG. 5; and/or the second device may be The second device provided by FIG. 9 or FIG. 10, and for performing the steps of the second device in the data transmission method provided in FIG. 4 or FIG. 5; and/or the third device may be provided in FIG. 11 or FIG. And a third device, and is used to perform the steps of the third device in the data transmission method provided in FIG. 4 or FIG. 5.

Finally, it should be noted that the above description is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be covered in the present application. Within the scope of protection of the application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims

A data transmission method, characterized in that the method comprises:

The first device sends a first data packet to the second device by using the first carrier, where the second device is a receiving device that transmits data of the first device on the first carrier transmission path, where the first carrier transmission path refers to An available path on the first carrier for transmitting data from the base station to the user equipment;

When the first device determines that the first data packet transmission fails, the first device sends a second data packet to the third device by using the second carrier, where the third device is on the first carrier transmission path. The data receiving device of the second device or the data of the second device passes the data receiving device after the relay, and the second data packet and the first data packet are data generated based on the same original data. package.
The data transmission method according to claim 1, wherein the first device determines that the first data packet transmission fails, and includes:

Receiving, by the first device, a negative acknowledgement message NACK sent by the second device, determining that the first data packet transmission fails; or

The first device does not receive the response feedback information within a preset duration, and determines that the first data packet transmission fails.
The data transmission method according to claim 1 or 2, wherein before the first device sends the second data packet to the third device by using the second carrier, the method further includes:

The first device receives configuration information, where the configuration information is used to indicate a hop count between the third device and the first device.
The data transmission method according to any one of claims 1 to 3, wherein the method further comprises:

The first device sends first indication information to the third device, where the first indication information is used to indicate that the second data packet is a retransmission data packet of data transmitted on the first carrier.
The data transmission method according to any one of claims 2 to 4, wherein when the first device receives the negative acknowledgement message NACK sent by the second device, the method further includes:

The first device sends the second indication information to the second device, where the second indication information is used to indicate that the second device sends the first received data packet to the third device, where the first receiving The data packet is a data packet received by the second device after the first data packet is transmitted.
The data transmission method according to any one of claims 1 to 5, wherein the HARQ process identifier of the first data packet is the same as the HARQ process identifier of the second data packet; or

The method further includes: the first device determining to transmit a first transmission time offset of the second data packet relative to transmitting the first data packet, and transmitting the first transmission time offset to The third device, the first transmission time offset is used for determining a correspondence between the first data packet and the second data packet.
The data transmission method according to any one of claims 1 to 6, wherein after the first device sends the second data packet to the third device by using the second carrier, the method further includes:

Receiving, by the first device, an acknowledgement response message ACK sent by the third device by using the second carrier, where the first device determines that the second data packet transmission is completed;

Receiving, by the first device, a negative acknowledgement message NACK sent by the third device by using the second carrier, where the first device sends a third data packet to the third device by using the second carrier, The third data packet and the first data packet are data packets generated based on the same original data.
A data transmission method, characterized in that the method comprises:

The second device receives the first received data packet, where the first received data packet is a data packet received by the second device after the first data packet sent by the first device by using the first carrier is transmitted;

When the second device determines that the first received data packet is an erroneous data packet, the second device sends a negative acknowledgement message NACK to the first device;

Receiving, by the second device, first indication information that is sent by the first device, where the first indication information is used to indicate that the second device sends the first received data packet to a third device, where the second device The data packet and the first data packet are data packets generated based on the same original data;

The second device sends the first received data packet to the third device according to the first indication information.
The data transmission method according to claim 8, wherein the process identifier of the second device receiving the first received data packet is the same as the process identifier of the first received data packet: or

The method further includes: determining, by the second device, a second transmission time offset for transmitting the first received data packet with respect to the first device, and transmitting the second transmission time The time offset is sent to the third device, and the second transmission time offset is used for determining the correspondence between the first received data packet and the first data packet.
A data transmission method, characterized in that the method comprises:

The third device receives the second received data packet, where the second received data packet is a data packet received by the third device after the second data packet sent by the first device by using the second carrier, and the second data packet is received by the third device. The packet and the first data packet are data packets generated based on the same original data, where the first data packet is a data packet that is sent by the first device to the second device by using the first carrier;

Receiving, by the third device, a first received data packet sent by the second device, where the first received data packet is a data packet received by the second device after the first data packet is transmitted; the first received data packet And the second received data packet is used for data decoding of the third device.
The data transmission method according to claim 10, wherein the method further comprises:

The third device receives the first indication information sent by the first device, where the first indication information is used to indicate that the second data packet is a retransmission data packet of data transmitted on the first carrier.
The data transmission method according to claim 10 or 11, wherein the method further comprises:

Receiving, by the third device, a first transmission time offset sent by the first device, where the first transmission time offset is that the first device sends the second data packet relative to the first device Transmitting, by the transmission time offset of the second data packet, the first transmission time offset is used for determining a correspondence between the first data packet and the second data packet.
The data transmission method according to any one of claims 10 to 12, wherein the method further comprises:

The third device receives a second transmission time offset sent by the second device, where the second transmission time offset is that the second device sends the first received data packet with respect to the first And transmitting, by the device, a transmission time offset of the first data packet, where the second transmission time offset is used for determining a correspondence between the first received data packet and the first data packet.
The data transmission method according to any one of claims 10 to 13, wherein the method further comprises:

When the third device determines that the second received data packet is correct, the third device sends an acknowledgement response message ACK to the first device by using the second carrier, where the acknowledgement response message is used to indicate the The second data packet transmission is completed;

When the third device determines that the second received data packet is an erroneous data packet, the third device sends a negative acknowledgement message NACK to the first device by using the second carrier, and the first device is received by the first device. The third data packet sent by the second carrier, the third data packet and the first data packet are data packets generated based on the same original data.
A first device, wherein the first device comprises:

a sending unit, configured to send, by using a first carrier, a first data packet to a second device, where the second device is a receiving device that transmits data of the first device on a first carrier transmission path, the first carrier transmission path Means an available path on the first carrier for transmitting data from the base station to the user equipment;

The sending unit is further configured to: when the first device determines that the first data packet transmission fails, send a second data packet to the third device by using the second carrier, where the third device is the first carrier a data receiving device of the second device or a receiving device of the data of the second device on the transmission path, wherein the second data packet and the first data packet are based on the same original data The generated packet.
The first device according to claim 15, wherein the first device further comprises:

a processing unit, configured to: when the first device receives the negative acknowledgement message NACK sent by the second device, determining that the first data packet transmission fails; or

The processing unit is configured to: the first device does not receive the response feedback information within a preset duration, and determines that the first data packet transmission fails.
The first device according to claim 15 or 16, wherein the first device further comprises:

The receiving unit is configured to receive configuration information, where the configuration information is used to indicate a hop count between the third device and the first device.
The first device according to any one of claims 15-17, wherein the sending unit is further configured to:

Sending, to the third device, first indication information, where the first indication information is used to indicate that the second data packet is a retransmission data packet of data transmitted on the first carrier.
The first device according to any one of claims 16 to 18, wherein when the first device receives the negative acknowledgement message NACK sent by the second device, the sending unit is further configured to:

Transmitting, to the second device, second indication information, where the second indication information is used to indicate that the second device sends the first received data packet to the third device, where the first received data packet is The data packet received by the second device after the first data packet is transmitted.
The first device according to any one of claims 15 to 19, wherein the HARQ process identifier of the first data packet is the same as the HARQ process identifier of the second data packet; or

The processing unit is further configured to determine a first transmission time offset for transmitting the second data packet with respect to sending the first data packet;

The sending unit is further configured to send the first transmission time offset to the third device, where the first transmission time offset is used for the first data packet and the second data packet The correspondence of the correspondence.
A first device according to any one of claims 15-20, wherein

The receiving unit is further configured to receive an acknowledgement response message ACK sent by the third device by using the second carrier, where the processing unit is further configured to determine that the second data packet transmission is complete;

The receiving unit is further configured to receive a negative acknowledgement message NACK sent by the third device by using the second carrier, where the sending unit is further configured to send, by using the second carrier, a third The data packet, the third data packet and the first data packet are data packets generated based on the same original data.
A second device, the second device comprising:

a receiving unit, configured to receive a first received data packet, where the first received data packet is a data packet that is received by the second device after the first data packet sent by the first device by using the first carrier is transmitted;

a sending unit, configured to send a negative acknowledgement message NACK to the first device when the second device determines that the first received data packet is an erroneous data packet;

The receiving unit is further configured to receive first indication information that is sent by the first device, where the first indication information is used to instruct the second device to send the first received data packet to a third device, where The second data packet and the first data packet are data packets generated based on the same original data;

The sending unit is further configured to send the first received data packet to the third device according to the first indication information.
The second device according to claim 22, wherein the process identifier of the second device receiving the first received data packet is the same as the process identifier of sending the first received data packet: or

The second device further includes: a processing unit, configured to determine a second transmission time offset for transmitting the first received data packet with respect to the first device to send the first data packet; the sending unit, And is further configured to send the second transmission time offset to the third device, where the second transmission time offset is used for a correspondence between the first received data packet and the first data packet. determine.
A third device, wherein the third device comprises:

a receiving unit, configured to receive a second received data packet, where the second received data packet is a data packet received by the third device after the second data packet sent by the first device by using the second carrier is transmitted, where The second data packet and the first data packet are data packets generated based on the same original data, where the first data packet is a data packet that is sent by the first device to the second device by using the first carrier;

The receiving unit is further configured to receive a first received data packet sent by the second device, where the first received data packet is a data packet that is received by the second device after the first data packet is transmitted; The received data packet and the second received data packet are used for data decoding of the third device.
The third device according to claim 24, wherein the receiving unit is further configured to:

And receiving, by the first device, first indication information, where the first indication information is used to indicate that the second data packet is a retransmission data packet of data transmitted on the first carrier.
The third device according to claim 24 or 25, wherein the receiving unit is further configured to:

Receiving, by the first device, a first transmission time offset, where the first transmission time offset is that the first device sends the second data packet, and the second device sends the second a transmission time offset of the data packet, the first transmission time offset being used for determining a correspondence between the first data packet and the second data packet.
The third device according to any one of claims 24 to 26, wherein the receiving unit is further configured to:

The third device receives a second transmission time offset sent by the second device, where the second transmission time offset is that the second device sends the first received data packet with respect to the first And transmitting, by the device, a transmission time offset of the first data packet, where the second transmission time offset is used for determining a correspondence between the first received data packet and the first data packet.
The third device according to any one of claims 24 to 26, wherein the third device further comprises:

a sending unit, configured to send, by using the second carrier, an acknowledgement response message ACK to the first device, when the third device determines that the second received data packet is correct, where the acknowledgement response message is used to indicate the The second data packet transmission is completed;

The sending unit is further configured to: when the third device determines that the second received data packet is an erroneous data packet, send a negative acknowledgement message NACK to the first device by using the second carrier; And a third data packet sent by the first device by using the second carrier, where the third data packet and the first data packet are data packets generated based on the same original data.
An apparatus, comprising: a memory, a processor in which code and data are stored, the memory being coupled to the processor, the processor running code in the memory such that The apparatus performs the data transmission method according to any one of claims 1 to 7, or the data transmission method according to any one of claims 8 to 9, or the data transmission method according to any one of claims 10 to 14. .
A readable storage medium, wherein the readable storage medium stores instructions, when the readable storage medium is run on a device, causing the device to perform any one of claims 1-7 The data transmission method, or the data transmission method according to any one of claims 8 to 9, or the data transmission method according to any one of claims 10 to 14.
A computer program product, wherein when the computer program product is run on a computer, the computer is caused to perform the data transmission method of any one of claims 1-7, or to perform any of claims 8-9 A data transmission method, or the data transmission method according to any one of claims 10-14.
A communication system, comprising: a first device according to any one of claims 15-21, a second device according to any one of claims 22-23, and any of claims 24-28 A third device as described.