WO2021056345A1 - Procédé et appareil de transmission de données - Google Patents

Procédé et appareil de transmission de données Download PDF

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Publication number
WO2021056345A1
WO2021056345A1 PCT/CN2019/108225 CN2019108225W WO2021056345A1 WO 2021056345 A1 WO2021056345 A1 WO 2021056345A1 CN 2019108225 W CN2019108225 W CN 2019108225W WO 2021056345 A1 WO2021056345 A1 WO 2021056345A1
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WIPO (PCT)
Prior art keywords
data pdu
group
data
node
feedback information
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PCT/CN2019/108225
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English (en)
Chinese (zh)
Inventor
马川
谭巍
郝金平
刘琼
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华为技术有限公司
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Priority to PCT/CN2019/108225 priority Critical patent/WO2021056345A1/fr
Publication of WO2021056345A1 publication Critical patent/WO2021056345A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes

Definitions

  • This application relates to the field of communications, and more specifically, to a method and device for data transmission.
  • IAB network equipment means that the access link and backhaul link of the network equipment are transmitted wirelessly.
  • a network including IAB network equipment and terminal equipment can be referred to as an IAB network.
  • the network coding technology can be used in the IAB network. The basic idea is: network coding or decoding is performed on the second node and the first node in the IAB network, and redundant data packets are introduced during network coding to improve the successful reception of data packets. Probability.
  • a network coding (NC) layer is introduced into the protocol stack of the second node and the first node in the IAB network.
  • the NC layer of the second node when data is transmitted between the second node and the first node, due to the introduction of the NC layer, the NC layer of the second node performs network coding based on the sent data segment to generate the NC layer data protocol Data unit (network coding data protocol data unit, NC data PDU) group.
  • the NC data PDU group includes multiple NC data PDUs.
  • the first node feedbacks the reception status for each NC data PDU received, and the feedback overhead is very large. .
  • This application provides a method and device for data transmission in order to reduce feedback overhead.
  • a data transmission method including: a first node receives a network coding layer NC data protocol data unit data PDU from a second node, where the NC data PDU includes the group number of the NC data PDU group; A node sends feedback information to the second node, where the feedback information is used to instruct the first node to receive the NC data PDU of the NC data PDU group.
  • the aforementioned NC data PDU is referred to as the first NC data PDU
  • the aforementioned NC data PDU group is the first NC data PDU group
  • the aforementioned feedback information is referred to as the first feedback information.
  • the first NC data PDU is not limited to a certain NC data PDU in the first NC data PDU group, but should be understood as one or more NC data PDUs in the first NC data PDU group.
  • the NC data PDU is called the first NC data PDU.
  • the first node after receiving the first NC data PDU from the second node, the first node sends the first feedback information to the second node, and feeds back the information to which the received first NC data PDU belongs
  • the reception status of the first NC data PDU of the first NC data PDU group enables the first node to feed back the reception status of the first NC data PDU of the first NC data PDU group, thereby reducing the feedback overhead of the first node.
  • the first feedback information is used to instruct the first node to receive the first NC data PDU of the first NC data PDU group, including: the feedback The information is used to indicate that the first node can decode the NC data segment group, and the NC data segment group corresponds to the NC data PDU group.
  • the first node receives a part of the NC data PDU in a group of NC data PDU and can decode the NC data segment corresponding to the first NC data PDU group based on the part of the NC data PDU.
  • the aforementioned first feedback information may be used to notify the second node that the first node has been able to decode the NC data segment group.
  • the second node learns that the first node can complete the decoding based on part of the NC data PDU in the first NC data PDU group, it can choose not to send the unsent data in the first NC data PDU group to the second node. NC data PDU, thereby reducing the number of NC data PDU transmissions.
  • the first feedback information includes the group number of the first NC data PDU group; or, the first feedback information includes the first NC data PDU group The group number and the sequence number of the first NC data PDU in the first NC data PDU group.
  • the above-mentioned first feedback information includes the group number of the first NC data PDU group, indicating that the feedback is the reception status of the NC data PDU in the first NC data PDU group. Further, the above feedback information may also include the group number of the first NC data PDU group and the sequence number of the first NC data PDU received in the first NC data PDU group, to clarify which ones in the first NC data PDU group The NC data PDU has been successfully received.
  • the first feedback information is carried in a first network coding NC layer control protocol data unit, and the first feedback information further includes first indication information, the first The indication information is used to indicate that the type of the NC layer protocol data unit (network coding protocol data unit, NC PDU) that carries the first feedback information is an NC layer control protocol data unit (network coding control protocol data unit, NC control PDU).
  • NC PDU network coding protocol data unit
  • the above-mentioned first feedback information can be carried on the first NC control PDU.
  • the first feedback information includes a PDU indicating the type of PDU. Instructions.
  • the method further includes: the first node receives a second NC data PDU from the second node, and the first node sends a second feedback to the second node Information, the second feedback information includes the sequence number of the second NC data PDU in the first NC data PDU group, and/or the number of the at least one second NC data PDU.
  • the first node may feed back to the second node the status of receiving the redundant NC data PDU. This enables the second node to learn which redundant NC data PDUs or how many redundant NC data PDUs can be successfully sent to the first node.
  • the foregoing second NC data PDU is one or more NC data PDUs other than the foregoing first NC data PDU in the first NC data PDU group.
  • the second feedback information is carried in a second network coding layer NC control protocol data unit, and the second feedback information further includes second indication information, the second The indication information is used to indicate that the type of NC PDU carrying the second feedback information is NC control PDU.
  • the above-mentioned second feedback information can be carried on the second NC control PDU.
  • the second feedback information includes the information indicating the PDU type.
  • the second instruction information includes the information indicating the PDU type.
  • the first node sends both the first NC control PDU and the second NC control PDU
  • the first NC control PDU and/or Difference information is added to the second NC control PDU, and the difference information is used to distinguish different NC control PDUs.
  • the aforementioned second NC data PDU includes: the second NC data PDU from the second node received by the first node within a time period.
  • the received redundant NC data PDU fed back by the first node may be received within a certain period of time. In this way, it is avoided that the redundant NC data PDU received without time limit is fed back and wasting resources.
  • the method further includes: the first node receives a third NC data PDU from the second node, and the third NC data PDU includes a third NC data PDU The group number of the group; the first node sends the first feedback information to the second node, and the first feedback information is used to instruct the first node to receive the first NC data PDU of the first NC data PDU group And the third NC data PDU of the third NC data PDU group.
  • the first node can feed back the reception status of NC data PDUs in multiple NC data PDU groups through a piece of feedback information. Thereby reducing the number of feedbacks.
  • the first feedback information includes the group number of the first NC data PDU group, and the number of the first NC data PDU in the first NC data PDU group.
  • the group number, the number of the first NC data PDU, the group number of the third NC data PDU group, and the number of the third NC data PDU; or, the first feedback information includes a statistical value, and the statistical value is used It indicates whether the number or probability of successful reception of the third NC data PDU group and the NC data PDU in the first NC data PDU group, the number or probability of reception failure, and whether the number or probability of reception success is higher than or Whether it is lower than the threshold value, or whether the number or probability of reception failure is higher or lower than the threshold value.
  • the feedback information may include the group numbers of the multiple NC data PDU groups and each The sequence number or number of the received NC data PDU in the NC data PDU group.
  • a data transmission method including: a second node sends a first network coding layer NC data protocol data unit data PDU to a first node, the first NC data PDU includes the first NC data PDU group Group number; the second node receives first feedback information from the first node, where the first feedback information is used to indicate that the first node receives the first NC data PDU of the first NC data PDU group.
  • the second node after the second node sends the first NC data PDU in the first NC data PDU group to the first node, it receives the first feedback information sent by the first node and learns the first NC
  • the reception status of the first NC data PDU of the data PDU group enables the first node to feed back the reception status of the first NC data PDU of the first NC data PDU group, thereby reducing the feedback overhead of the first node.
  • the first feedback information is used to instruct the first node to receive the first NC data PDU of the first NC data PDU group, including: the feedback The information is used to indicate that the first node can decode the NC data segment group, and the NC data segment group corresponds to the NC data PDU group.
  • the first node receives a part of the NC data PDU in a group of NC data PDU group and can decode the NC data segment corresponding to the first NC data PDU group based on the part of the NC data PDU.
  • the aforementioned first feedback information may be used to notify the second node that the first node has been able to decode the NC data segment group.
  • the second node learns that the first node can complete decoding based on part of the NC data PDU in the first NC data PDU group, it can choose not to send the unsent data in the first NC data PDU group to the second node. NC data PDU, thereby reducing the number of NC data PDU transmissions.
  • the first feedback information includes the group number of the first NC data PDU group; or, the first feedback information includes the group number of the first NC data PDU group. The group number and the sequence number of the first NC data PDU in the first NC data PDU group.
  • the above-mentioned first feedback information includes the group number of the first NC data PDU group, indicating that the feedback is the reception status of the NC data PDU in the first NC data PDU group. Further, the foregoing feedback information may also include the sequence number of the first NC data PDU in the first NC data PDU group received, to clarify which NC data PDUs in the first NC data PDU group have been successfully received.
  • the first feedback information is carried in a first network coding layer NC control protocol data unit, and the first feedback information further includes first indication information, and the first The indication information is used to indicate that the type of NC PDU carrying the first feedback information is NC control PDU.
  • the above-mentioned first feedback information can be carried on the first NC control PDU.
  • the first feedback information includes the information indicating the PDU type. Instructions.
  • the method further includes: the second node sends a second NC data PDU to the first node, and the second node receives the second NC data PDU from the first node.
  • Feedback information includes the sequence number of the second NC data PDU in the first NC data PDU group, and/or the number of the at least one second NC data PDU.
  • the first node may feed back to the second node the status of receiving the redundant NC data PDU. This enables the second node to learn which redundant NC data PDUs or how many redundant NC data PDUs can be successfully sent to the first node.
  • the foregoing second NC data PDU is one or more NC data PDUs in the first NC data PDU group except for the foregoing first NC data PDU.
  • the second feedback information is carried in a second network coding layer NC control protocol data unit, and the second feedback information further includes second indication information, the second The indication information is used to indicate that the type of NC PDU carrying the second feedback information is NC control PDU.
  • the above-mentioned second feedback information can be carried on the second NC control PDU.
  • the second feedback information includes the information indicating the PDU type.
  • the second instruction information includes the information indicating the PDU type.
  • the first node sends both the first NC control PDU and the second NC control PDU
  • the first NC control PDU and/or Difference information is added to the second NC control PDU, and the difference information is used to distinguish different NC control PDUs.
  • the aforementioned second NC data PDU includes: the second node sends the second NC data PDU to the first node within a time period.
  • the redundant NC data PDU that is fed back sent by the second node may be sent within a certain period of time. Thereby, the redundant NC data PDU of feedback can be avoided without time limit and waste of resources.
  • the method further includes: the second node sends a third NC data PDU to the first node, and the third NC data PDU includes a third NC data PDU group The group number of the second node; the second node receives the first feedback information from the first node, the first feedback information is used to instruct the first node to receive the first NC data PDU of the first NC data PDU group, and The situation of the third NC data PDU of the third NC data PDU group.
  • the first node can feed back the reception status of NC data PDUs in multiple NC data PDU groups through a piece of feedback information. Thereby reducing the number of feedbacks.
  • the first feedback information includes the group number of the first NC data PDU group, and the number of the first NC data PDU in the first NC data PDU group.
  • the group number, the number of the first NC data PDU, the group number of the third NC data PDU group, and the number of the third NC data PDU; or, the first feedback information includes a statistical value, and the statistical value is used It indicates whether the number or probability of successful reception of the third NC data PDU group and the NC data PDU in the first NC data PDU group, the number or probability of reception failure, and whether the number or probability of reception success is higher than or Whether it is lower than the threshold value, or whether the number or probability of reception failure is higher or lower than the threshold value.
  • the feedback information may include the group numbers of the multiple NC data PDU groups and each The sequence number or number of the received NC data PDU in the NC data PDU group.
  • a data transmission method including: a first node receives a first network coding layer NC data protocol data unit data PDU and a third NC data PDU from a second node, the first NC data PDU includes The group number of the first NC data PDU group, the third NC data PDU includes the group number of the third NC data PDU group; the first node sends first feedback information to the second node, and the first feedback information is used to indicate The first node receives the situation of the first NC data PDU of the first NC data PDU group and the situation of the third NC data PDU of the third NC data PDU group.
  • the first node can feed back the reception status of NC data PDUs in multiple NC data PDU groups through a piece of feedback information. Thereby reducing the number of feedbacks.
  • the first feedback information includes the group number of the first NC data PDU group, and the number of the first NC data PDU in the first NC data PDU group.
  • the feedback information may include the group numbers of the multiple NC data PDU groups and each The sequence number of the received NC data PDU in the NC data PDU group.
  • the first feedback information includes the group number of the first NC data PDU group, the number of the first NC data PDU, and the third NC data PDU The group number of the group and the number of the third NC data PDU.
  • the feedback information may include the group numbers of the multiple NC data PDU groups and each The number of NC data PDUs received in the NC data PDU group.
  • the first feedback information includes a statistical value
  • the statistical value is used to indicate the third NC data PDU group and the NC in the first NC data PDU group data The number or probability of successful reception of PDU, the number or probability of reception failure, whether the number or probability of reception success is higher or lower than the threshold, or whether the number or probability of reception failure is higher or lower Threshold value.
  • the feedback information may include the NC data PDU indicating multiple NC data PDU groups. Receive the statistical value of the probability of success or failure.
  • a data transmission method including: a second node sends a first network coding layer NC data protocol data unit data PDU and a third NC data PDU to the first node, and the first NC data PDU includes the first NC data PDU.
  • the first node can feed back the reception status of NC data PDUs in multiple NC data PDU groups through a piece of feedback information. Thereby reducing the number of feedbacks.
  • the first feedback information includes the group number of the first NC data PDU group, and the number of the first NC data PDU in the first NC data PDU group.
  • the feedback information may include the group numbers of the multiple NC data PDU groups and each The sequence number of the received NC data PDU in the NC data PDU group.
  • the first feedback information includes the group number of the first NC data PDU group, the number of the first NC data PDU, and the third NC data PDU The group number of the group and the number of the third NC data PDU.
  • the feedback information may include the group numbers of the multiple NC data PDU groups and each The number of NC data PDUs received in the NC data PDU group.
  • the first feedback information includes a statistical value
  • the statistical value is used to indicate the third NC data PDU group and the NC in the first NC data PDU group data The number or probability of successful reception of PDU, the number or probability of reception failure, whether the number or probability of reception success is higher or lower than the threshold, or whether the number or probability of reception failure is higher or lower Threshold value.
  • the feedback information may include the NC data PDU indicating multiple NC data PDU groups. Receive the statistical value of the probability of success or failure.
  • a data transmission device including: a receiving unit for receiving a network coding layer NC data protocol data unit data PDU from a second node, where the NC data PDU includes the group number of the NC data PDU group, Wherein, the data transmission device includes a first node; a sending unit is used to send feedback information to the second node, and the feedback information is used to instruct the first node to receive the NC data PDU of the NC data PDU group .
  • the first feedback information is used to instruct the first node to receive the first NC data PDU of the first NC data PDU group, including: the feedback The information is used to indicate that the first node can decode the NC data segment group, and the NC data segment group corresponds to the NC data PDU group.
  • the first feedback information includes the group number of the first NC data PDU group; or, the first feedback information includes the group number of the first NC data PDU group The group number and the sequence number of the first NC data PDU in the first NC data PDU group.
  • the first feedback information is carried in a first network coding layer NC control protocol data unit, and the first feedback information further includes first indication information, and the first The indication information is used to indicate that the type of NC PDU carrying the first feedback information is NC control PDU.
  • the device further includes: the receiving unit is further configured to receive a second NC data PDU from the second node, and the sending unit is further configured to send the The two nodes send second feedback information, where the second feedback information includes the sequence number of the second NC data PDU in the first NC data PDU group, and/or the number of the at least one second NC data PDU.
  • the second feedback information is carried in a second network coding layer NC control protocol data unit, and the second feedback information further includes second indication information.
  • the indication information is used to indicate that the type of NC PDU carrying the second feedback information is NC control PDU.
  • the aforementioned second NC data PDU includes: the second NC data PDU from the second node received by the receiving unit within a time period.
  • the device further includes: the receiving unit is further configured to receive a third NC data PDU from the second node, and the third NC data PDU includes a third The group number of the NC data PDU group; the sending unit is also used to send the first feedback information to the second node, and the first feedback information is used to instruct the first node to receive the first NC data PDU group 1. The situation of the NC data PDU and the situation of the third NC data PDU of the third NC data PDU group.
  • the first feedback information includes the group number of the first NC data PDU group, and the number of the first NC data PDU in the first NC data PDU group.
  • the group number, the number of the first NC data PDU, the group number of the third NC data PDU group, and the number of the third NC data PDU; or, the first feedback information includes a statistical value, and the statistical value is used It indicates whether the number or probability of successful reception of the third NC data PDU group and the NC data PDU in the first NC data PDU group, the number or probability of reception failure, and whether the number or probability of reception success is higher than or Whether it is lower than the threshold value, or whether the number or probability of reception failure is higher or lower than the threshold value.
  • the data transmission device provided in the fifth aspect and any possible implementation manner of the fifth aspect may be used to perform the operation of the first node in the first aspect and any possible implementation manner of the first aspect.
  • the device for data transmission includes means for executing the steps or functions described in the first aspect and any possible implementation of the first aspect.
  • the means may be the first node or the function in the first aspect.
  • the steps or functions can be realized by software, or by hardware, or by a combination of hardware and software.
  • a data transmission device including: a sending unit, configured to send a first network coding layer NC data protocol data unit data PDU to a first node, where the first NC data PDU includes the first NC data PDU The group number of the group; the receiving unit is configured to receive first feedback information from the first node, where the first feedback information is used to instruct the first node to receive the first NC data PDU of the first NC data PDU group Case.
  • the first feedback information is used to instruct the first node to receive the first NC data PDU of the first NC data PDU group, including: the feedback The information is used to indicate that the first node can decode the NC data segment group, and the NC data segment group corresponds to the NC data PDU group.
  • the first feedback information includes the group number of the first NC data PDU group; or, the first feedback information includes the first NC data PDU group The group number and the sequence number of the first NC data PDU in the first NC data PDU group.
  • the first feedback information is carried in a first network coding layer NC control protocol data unit, and the first feedback information further includes first indication information, and the first The indication information is used to indicate that the type of NC PDU carrying the first feedback information is NC control PDU.
  • the device further includes: the sending unit is further configured to send a second NC data PDU to the first node, and the receiving unit is further configured to receive data from the The second feedback information of the first node, where the second feedback information includes the sequence number of the second NC data PDU in the first NC data PDU group, and/or the number of the at least one second NC data PDU.
  • the second feedback information is carried in a second network coding layer NC control protocol data unit, and the second feedback information further includes second indication information.
  • the indication information is used to indicate that the type of NC PDU carrying the second feedback information is NC control PDU.
  • the foregoing second NC data PDU includes: the sending unit sends the second NC data PDU to the first node within a time period.
  • the sending unit is further configured to send a third NC data PDU to the first node, and the third NC data PDU includes the group number of the third NC data PDU group
  • the receiving unit is also used to receive first feedback information from the first node, the first feedback information is used to instruct the first node to receive the NC data PDU of the NC data PDU group and the third NC The status of the third NC data PDU of the data PDU group.
  • the first feedback information includes the group number of the first NC data PDU group, and the number of the first NC data PDU in the first NC data PDU group.
  • the group number, the number of the first NC data PDU, the group number of the third NC data PDU group, and the number of the third NC data PDU; or, the first feedback information includes a statistical value, and the statistical value is used It indicates whether the number or probability of successful reception of the third NC data PDU group and the NC data PDU in the first NC data PDU group, the number or probability of reception failure, and whether the number or probability of reception success is higher than or Whether it is lower than the threshold value, or whether the number or probability of reception failure is higher or lower than the threshold value.
  • the data transmission device provided in the sixth aspect and any possible implementation manner of the sixth aspect may be used to perform the operation of the second node in the second aspect and any possible implementation manner of the second aspect.
  • the device for data transmission includes the means for executing the steps or functions described in the second aspect and any possible implementation of the second aspect.
  • the corresponding means may be the second node or the function in the second aspect.
  • the steps or functions can be realized by software, or by hardware, or by a combination of hardware and software.
  • a data transmission device including: a receiving unit configured to receive a first network coding layer NC data protocol data unit data PDU and a third NC data PDU from a second node, the first NC data The PDU includes the group number of the first NC data PDU group, and the third NC data PDU includes the group number of the third NC data PDU group; the sending unit is used to send the first feedback information to the second node, the first feedback information It is used to instruct the first node to receive the first NC data PDU of the first NC data PDU group and the third NC data PDU of the third NC data PDU group.
  • the first feedback information includes the group number of the first NC data PDU group, and the number of the first NC data PDU in the first NC data PDU group.
  • the first feedback information includes the group number of the first NC data PDU group, the number of the first NC data PDU, and the third NC data PDU The group number of the group and the number of the third NC data PDU.
  • the first feedback information includes a statistical value
  • the statistical value is used to indicate the third NC data PDU group and the NC in the first NC data PDU group data The number or probability of successful reception of PDU, the number or probability of reception failure, whether the number or probability of reception success is higher or lower than the threshold, or whether the number or probability of reception failure is higher or lower Threshold value.
  • the data transmission device provided in the seventh aspect and any possible implementation manner of the seventh aspect may be used to perform the operation of the first node in the third aspect and any possible implementation manner of the third aspect.
  • the device for data transmission includes the means for executing the steps or functions described in the third aspect and any possible implementation of the third aspect.
  • the corresponding means may be the first node or the function in the third aspect.
  • the steps or functions can be realized by software, or by hardware, or by a combination of hardware and software.
  • a data transmission device including: a sending unit, configured to send a first network coding layer NC data protocol data unit data PDU and a third NC data PDU to a first node, the first NC data PDU It includes the group number of the first NC data PDU group, and the third NC data PDU includes the group number of the third NC data PDU group; the receiving unit is configured to receive the first feedback information from the first node, the first feedback information It is used to instruct the first node to receive the first NC data PDU of the first NC data PDU group and the third NC data PDU of the third NC data PDU group.
  • the first feedback information includes the group number of the first NC data PDU group, and the number of the first NC data PDU in the first NC data PDU group The sequence number, the group number of the third NC data PDU group, and the sequence number of the third NC data PDU in the third NC data PDU group.
  • the first feedback information includes the group number of the first NC data PDU group, the number of the first NC data PDU, and the third NC data PDU The group number of the group and the number of the third NC data PDU.
  • the first feedback information includes a statistical value
  • the statistical value is used to indicate the third NC data PDU group and the NC in the first NC data PDU group data The number or probability of successful reception of PDU, the number or probability of reception failure, whether the number or probability of reception success is higher or lower than the threshold, or whether the number or probability of reception failure is higher or lower Threshold value.
  • the data transmission device provided in the eighth aspect and any possible implementation manner of the eighth aspect may be used to perform the operation of the second node in the fourth aspect and any possible implementation manner of the fourth aspect.
  • the device for data transmission includes the means for executing the steps or functions described in the fourth aspect and any possible implementation of the fourth aspect.
  • the corresponding means may be the second node or the function in the fourth aspect.
  • the steps or functions can be realized by software, or by hardware, or by a combination of hardware and software.
  • a data transmission device configured to implement the function of the first node in the method described in the first aspect.
  • the data transmission device may further include a memory coupled with the processor, and the processor is configured to implement the function of the first node in the method described in the first aspect.
  • the memory is used to store program instructions and data.
  • the memory is coupled with the processor, and the processor can call and execute the program instructions stored in the memory to implement the function of the first node in the method described in the first aspect.
  • the data transmission device may further include a communication interface, and the communication interface is used for the data transmission device to communicate with other devices.
  • the transceiver may be a communication interface or an input/output interface.
  • the data transmission device includes: a processor and a communication interface, used to implement the function of the first node in the method described in the first aspect, specifically including:
  • the processor uses the communication interface to communicate with the outside;
  • the processor is used to run a computer program, so that the device implements any one of the methods described in the first aspect.
  • the exterior may be an object other than the processor, or an object other than the device.
  • the communication interface may be an input/output interface, interface circuit, output circuit, input circuit, pin or related on the chip or chip system. Circuit etc.
  • the processor can also be embodied as a processing circuit or a logic circuit.
  • a data transmission device configured to implement the function of the second node in the method described in the second aspect.
  • the data transmission device may further include a memory coupled with the processor, and the processor is configured to implement the function of the second node in the method described in the second aspect.
  • the memory is used to store program instructions and data.
  • the memory is coupled with the processor, and the processor can call and execute the program instructions stored in the memory to implement the function of the second node in the method described in the second aspect.
  • the data transmission device may further include a communication interface, and the communication interface is used for the data transmission device to communicate with other devices.
  • the communication interface is a transceiver, an input/output interface, or a circuit.
  • the data transmission device includes: a processor and a communication interface
  • the processor uses the communication interface to communicate with the outside;
  • the processor is used to run a computer program, so that the device implements any of the methods described in the second aspect.
  • the data transmission device is a chip or a chip system.
  • the communication interface may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip or chip system.
  • the processor may also be embodied as a processing circuit or a logic circuit.
  • a data transmission device in an eleventh aspect, includes a processor for implementing the function of the first node in the method described in the third aspect.
  • the data transmission device may further include a memory, which is coupled to the processor, and the processor is configured to implement the function of the first node in the method described in the third aspect.
  • the memory is used to store program instructions and data.
  • the memory is coupled with the processor, and the processor can call and execute the program instructions stored in the memory to implement the function of the first node in the method described in the third aspect.
  • the data transmission device may further include a communication interface, and the communication interface is used for the data transmission device to communicate with other devices.
  • the communication interface is a transceiver, an input/output interface, or a circuit.
  • the data transmission device includes: a processor and a communication interface
  • the processor uses the communication interface to communicate with the outside;
  • the processor is used to run a computer program, so that the device implements any one of the methods described in the third aspect.
  • the data transmission device is a chip or a chip system.
  • the communication interface may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip or chip system.
  • the processor may also be embodied as a processing circuit or a logic circuit.
  • a data transmission device configured to implement the function of the second node in the method described in the fourth aspect.
  • the data transmission apparatus may further include a memory, the memory is coupled to the processor, and the processor is configured to implement the function of the second node in the method described in the fourth aspect.
  • the memory is used to store program instructions and data.
  • the memory is coupled with the processor, and the processor can call and execute program instructions stored in the memory to implement the function of the second node in the method described in the fourth aspect.
  • the data transmission apparatus may further include a communication interface, and the communication interface is used for the data transmission apparatus to communicate with other devices.
  • the transceiver may be a communication interface or an input/output interface.
  • the data transmission device includes: a processor and a communication interface, used to implement the function of the second node in the method described in the fourth aspect, specifically including:
  • the processor communicates with the outside by using the communication interface
  • the processor is used to run a computer program, so that the device implements any one of the methods described in the fourth aspect.
  • the exterior may be an object other than the processor, or an object other than the device.
  • the communication interface may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin, or an input/output interface on the chip or the chip system.
  • the processor may also be embodied as a processing circuit or a logic circuit.
  • a computer-readable storage medium on which a computer program is stored.
  • the communication device realizes the first to fourth aspects, as well as the first to fourth aspects.
  • the method in any possible implementation of the four aspects.
  • a computer program product containing instructions which when executed by a computer, enables a communication device to implement any one of the first to fourth aspects and any of the first and fourth aspects. method.
  • FIG. 1 is a schematic diagram of a communication system 100 that can apply the data transmission method provided by the embodiment of the present application.
  • Fig. 2 is a schematic block diagram of an IAB network provided by an embodiment of the present application.
  • Fig. 3 is a schematic block diagram of a protocol stack of an IAB network provided by an embodiment of the present application.
  • FIG. 4 is a schematic block diagram of a protocol stack with an NC layer provided by an embodiment of the present application.
  • FIG. 5 is a schematic block diagram of another protocol stack with NC layer provided by an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a data transmission method provided by an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of another data transmission method provided by an embodiment of the present application.
  • FIG. 8 is a schematic block diagram of an NC data PDU provided by an embodiment of the present application.
  • FIG. 9 is a schematic diagram of an NC layer data processing flow provided by an embodiment of the present application.
  • FIG. 10 is a schematic diagram of another NC data PDU provided by an embodiment of the present application.
  • FIG. 11 are schematic diagrams of the format of an NC control PDU carrying the first feedback information provided by an embodiment of the present application.
  • FIG. 12 are schematic diagrams of the format of an NC control PDU carrying the second feedback information provided by an embodiment of the present application.
  • FIG. 13 are schematic diagrams of another NC control PDU format that carries the first feedback information provided by an embodiment of the present application.
  • FIG. 14 is a schematic diagram of a data transmission device 1400 proposed in this application.
  • FIG. 15 is a schematic structural diagram of a first node 1500 applicable to an embodiment of the present application.
  • FIG. 16 is a schematic diagram of a data transmission device 1600 proposed in this application.
  • FIG. 17 is a schematic structural diagram of a second node 1700 applicable to an embodiment of the present application.
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD time division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • 5G fifth generation
  • NSA non-standalone
  • SA standalone
  • SA 5G mobile communication system
  • the communication system can also be a public land mobile network (PLMN) network, a device-to-device (D2D) communication system, a machine-to-machine (M2M) communication system, and a device-to-device (D2D) communication system.
  • PLMN public land mobile network
  • D2D device-to-device
  • M2M machine-to-machine
  • D2D device-to-device
  • IoT Internet of Things
  • the terminal equipment (terminal equipment) in the embodiments of this application may refer to an access terminal, a user unit, a user station, a mobile station, a mobile station, a relay station, a remote station, a remote terminal, a mobile device, a user terminal, and a user equipment.
  • UE user equipment
  • terminal terminal
  • wireless communication equipment user agent, or user device.
  • the terminal device can also be a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (personal digital assistant, PDA), with wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the future 5G network, or future evolution of the public land mobile network (PLMN)
  • PLMN public land mobile network
  • wearable devices can also be referred to as wearable smart devices. It is a general term for using wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, Gloves, watches, clothing and shoes, etc.
  • a wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. Wearable devices are not only a kind of hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones.
  • the terminal device can also be a terminal device in the IoT system.
  • IoT is an important part of the development of information technology in the future. Its main technical feature is to connect objects to the network through communication technology to realize man-machine Interconnection, an intelligent network of interconnection of things.
  • the IOT technology can achieve massive connections, deep coverage, and power saving of the terminal through, for example, narrowband (narrowband, NB) technology.
  • the terminal equipment may also include sensors such as smart printers, train detectors, gas stations, etc.
  • the main functions include collecting data (part of the terminal equipment), receiving control information and downlink data from network equipment, and sending electromagnetic waves. , To transmit uplink data to network equipment.
  • the network device in the embodiment of the present application may be any communication device with a wireless transceiving function that is used to communicate with a terminal device.
  • This equipment includes but is not limited to: evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC) , Base transceiver station (base transceiver station, BTS), home base station (home evolved NodeB, HeNB, or home Node B, HNB), baseband unit (baseband unit, BBU), wireless fidelity (wireless fidelity, WIFI) system Access point (AP), wireless relay node, wireless backhaul node, transmission point (TP), or transmission and reception point (TRP), etc., can also be 5G, such as NR ,
  • the gNB may include a centralized unit (CU) and a DU.
  • the gNB may also include an active antenna unit (AAU).
  • the CU implements some of the functions of the gNB, and the DU implements some of the functions of the gNB.
  • the CU is responsible for processing non-real-time protocols and services, and implements radio resource control (radio resource control, RRC) and packet data convergence protocol (packet data convergence protocol, PDCP) layer functions.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • the DU is responsible for processing the physical layer protocol and real-time services, and realizes the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer.
  • RLC radio link control
  • MAC media access control
  • PHY physical
  • AAU realizes some physical layer processing functions, radio frequency processing and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be transformed from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by the DU , Or, sent by DU+AAU.
  • the network device may be a device that includes one or more of a CU node, a DU node, and an AAU node.
  • the CU can be divided into network equipment in an access network (radio access network, RAN), and the CU can also be divided into network equipment in a core network (core network, CN), which is not limited in this application.
  • the terminal device or the network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer.
  • the hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also referred to as main memory).
  • the operating system may be any one or more computer operating systems that implement business processing through processes, for example, Linux operating systems, Unix operating systems, Android operating systems, iOS operating systems or windows operating systems.
  • the application layer includes applications such as browsers, address books, word processing software, and instant messaging software.
  • the embodiments of the application do not specifically limit the specific structure of the execution body of the method provided in the embodiments of the application, as long as the program that records the codes of the methods provided in the embodiments of the application can be provided in accordance with the embodiments of the application.
  • the execution subject of the method provided in the embodiments of the present application may be a terminal device or a network device, or a functional module in the terminal device or the network device that can call and execute the program.
  • FIG. 1 is a schematic diagram of a communication system 100 that can apply the data transmission method provided by the embodiment of the present application.
  • the communication system 100 includes a network device 110 and a terminal device 120, and the network device 110 and the terminal device 120 communicate through a wireless network.
  • FIG. 2 is a schematic diagram of an IAB network provided by an embodiment of this application. block diagram.
  • the IAB network equipment includes two types of nodes: IAB host (IAB-donor) and IAB node (IAB-node).
  • IAB-donor is directly connected to the core network (core network, CN), which can provide access services for terminal devices, and can also provide IAB-node with a backhaul exit to the core network;
  • IAB-node is not directly connected to the core network , But through (single-hop or multi-hop) wireless backhaul to connect to the IAB-donor, from the IAB-donor back to the core network.
  • IAB-node can provide access services for terminal equipment, and can also provide relays for backhaul links for other IAB-nodes.
  • the IAB-node accessed by the terminal equipment is called the access IAB-node (access IAB-node), and the IAB-node for the backhaul relay is called the intermediate IAB-node (intermediate IAB-node). .
  • IAB-donor adopts a separate architecture, including two parts: CU and DU, and IAB-node includes two parts: mobile terminal (MT) and DU.
  • MT mobile terminal
  • the function of the MT part is equivalent to the terminal equipment, the IAB-node connects to the upstream IAB-node or IAB-donor through the MT; the function of the DU part is the same as the ordinary DU, and the IAB-node connects to the terminal equipment or downstream IAB-node through the DU.
  • IAB-donor CU and IAB-node DU include a communication interface (for example, F1 interface), and IAB-donor DU or IAB-node DU and downstream IAB-node MT include a communication interface (for example, Uu interface) .
  • Fig. 3 is a schematic block diagram of a protocol stack of an IAB network provided by an embodiment of the present application.
  • the backhaul adaptation protocol (BAP) layer is a protocol layer unique to IAB network equipment, and is responsible for functions such as RLC channel mapping and routing.
  • the service data adaptation protocol (SDAP) layer is responsible for mapping the quality of service (QoS) flow to the corresponding data resource block (DRB).
  • the Internet Protocol (IP) layer encapsulates various services such as IP.
  • the general packet radio service (GPRS) tunnel protocol-U (GPRS tunnel protocol-U, GTP-U) layer is used to transmit data of terminal equipment between the access network and the core network.
  • GPRS general packet radio service
  • Network coding technology is a coding technology that incorporates routing technology. Its core idea is to allow network nodes to perform coding operations on information received on different links, so that network nodes can simultaneously implement routing and coding functions. Network coding technology can increase network transmission capacity and improve network transmission reliability.
  • Network coding includes methods such as linear network coding and random network coding. Among them, linear network coding is more commonly used, and its main operation is to linearly combine data packets in a finite field.
  • the linear network coding and decoding process is as follows:
  • the encoding process includes the second node performing linear network coding on these k data packets to obtain new data packets Y 1 , Y 2 ,..., Y k :
  • C is a coding matrix
  • each row of the C matrix is a coding vector
  • each coding vector is linearly independent.
  • the second node sends k new data packets to the first node on one or more paths.
  • the decoding process includes that after the first node receives Y 1 , Y 2 ,..., Y k , the original data packets X 1 , X 2 ,..., X k can be recovered through C -1 (that is, the inverse matrix of C).
  • the number of original data packets is the same as the number of encoded data packets.
  • the values of k and n can be adaptively determined according to the transmission environment, Called coding redundancy.
  • the network coding technology is used in the IAB network, and the NC layer is introduced in the second node and the first node in the IAB network.
  • the introduction of the NC layer in the IAB network includes the following two situations:
  • FIG. 4 is a schematic block diagram of a protocol stack with an NC layer provided by an embodiment of the present application.
  • IAB-donor is the first node in the IAB network, and UE is the second node in the IAB network; another possible implementation IAB-donor is the second node in the IAB network, UE It is the first node in the IAB network.
  • FIG. 5 is a schematic block diagram of another protocol stack with NC layer provided by an embodiment of the present application.
  • IAB-donor is the first node in the IAB network
  • IAB-node is the second node in the IAB network
  • IAB-node is the first node in the IAB network.
  • FIG. 6 is a schematic flowchart of a data transmission provided by an embodiment of the present application.
  • the NC layer is located below the PDCP layer of the IAB-donor and UE.
  • IAB-donor transmits data to UE, the process is as follows:
  • Step 1 The NC layer of IAB-donor first divides a PDCP data PDU into 4 data segments, and then performs linear network coding on these data segments to generate 6 NC data PDUs: "a" "b” "c” ""D” "e” "f".
  • Step 2 The IAB-donor transmits these NC data PDUs on one or more paths. Packet loss may occur on the transmission path, for example, IAB-node 1 discards "b" and IAB-node 2 discards "f".
  • Step 3 The UE receives the NC data PDU. As long as the UE receives 4 of the 6 NC data PDUs, it can decode 4 NC data segments, and then can recover the PDCP data PDU. For example, the UE can decode "1", “2", “3”, and “4" according to "b", “c", "d” and "e”.
  • the data transmission process in the above case 2 can also include the above steps 1 and 2.
  • the difference is that the NC layer receives an IP packet, and the specific process is similar to the case 1.
  • Figure 6 shows the downlink transmission.
  • the process of uplink transmission is also similar to the process described above. For the sake of brevity, details are not repeated here.
  • the NC layer of the second node will generate redundant NC data PDUs, and the first node can decode the original data only by receiving part of the NC data PDUs, but the second node cannot Knowing whether the first node decodes the original data, the second node will send all NC data PDUs to the first node, resulting in a large overhead for sending NC data PDUs.
  • the feedback mechanism stipulated in the current protocol adopts a "PDU by PDU" method for feedback (that is, the first node feedbacks each received PDU), and the number of feedbacks is too many.
  • used to indicate can include both used for direct indication and used for indirect indication.
  • the indication information can directly indicate A or indirectly indicate A, but it does not mean that A must be included in the indication information.
  • the information used for the indication can be called the information to be indicated.
  • the information to be indicated may be directly indicated, such as the information to be indicated itself or the index of the information to be indicated.
  • the information to be indicated can also be indicated indirectly by indicating other information, where there is an association relationship between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while other parts of the information to be indicated are known or agreed in advance. For example, it is also possible to realize the indication of specific information by means of the pre-arranged order (for example, stipulated in the agreement) of the various information, thereby reducing the indication overhead to a certain extent.
  • the first, second, and various numerical numbers are only for the convenience of description, and are not used to limit the present application. Apply for the scope of the embodiment. For example, distinguish different NC data PDU groups, distinguish different NC data PDUs, or distinguish different feedback information.
  • preset may include indications or pre-defined by network device signaling, for example, protocol definitions.
  • pre-defined can be implemented by pre-saving corresponding codes, tables, or other methods that can be used to indicate related information in the device (for example, including user equipment and network equipment). This application does not make any specific implementation methods. limited.
  • saving may mean saving in one or more memories.
  • the one or more memories may be provided separately or integrated in an encoder, decoder, processor, or communication device.
  • the one or more memories may also be partly provided separately, and partly integrated in the encoder, decoder, processor, or communication device.
  • the type of memory can be any form of storage medium, which is not limited in this application.
  • protocol may refer to a standard protocol in the communication field, for example, it may include LTE protocol, NR protocol, and related protocols applied to future communication systems, which are not limited in this application.
  • the embodiment of the application provides a data transmission method.
  • the first node feeds back to the second node the status of the NC data PDU in the NC data PDU group received by itself, instead of feeding back each NC data PDU received separately, but with The granularity of the NC data PDU group is fed back, which can reduce the number of feedbacks and reduce the overhead.
  • the embodiment shown below does not specifically limit the specific structure of the execution body of the data transmission method provided by the embodiment of the application, as long as the program that records the code of the data transmission method provided by the embodiment of the application can be run to Data transmission can be performed according to the data transmission method provided in the embodiment of the application.
  • the execution subject of the data transmission method provided in the embodiment of the application may be the first node or the second node, or the data transmission method provided in the embodiment of the application
  • the execution subject of the data transmission method may be a functional module in the first node or the second node that can call and execute the program.
  • FIG. 7 is a schematic flowchart of a data transmission method provided by an embodiment of the present application.
  • the execution body includes a first node and a second node.
  • FIG. 7 only the sending end and the receiving end of the data are shown in FIG. 7.
  • an intermediate node may also be included between the first node and the second node for transmitting data, which is not shown in the figure.
  • the data transmission method includes some or all of the following steps.
  • S710 The second node generates at least one NC data PDU group.
  • the NC layer of the second node obtains the data PDU to be sent to the first node from the previous protocol layer of the NC layer. Based on the different positions of the NC layer in the protocol stack, at least the following two situations are included:
  • the upper layer of the NC layer is the PDCP layer.
  • the NC layer of the second node divides the PDCP data PDU into several data segments, and each data segment is called an NC data segment (NC segment).
  • the upper layer of the NC layer is the IP layer.
  • the NC layer of the second node divides the IP packet into several data segments, and each data segment is called an NC data segment.
  • the above case 1 and case 2 are examples to facilitate the understanding of the source of the NC layer data of this application, and do not constitute any limitation to the protection scope of this application.
  • the upper layer of the NC layer in this application does not necessarily limit it to In the situation shown in Figure 4 or Figure 5, in other protocol stack structures, the upper layer of the NC layer can also be other protocol layers such as the SDAP layer or the UDP layer.
  • the NC layer receives the data transmitted by the upper layer of the NC layer.
  • the subsequent processing flow is similar to the above-mentioned case 1 and case 2, and will not be explained here.
  • the second node selects multiple NC data segments as an NC data segment group.
  • Multiple different NC data segments in the same NC data segment group can come from the same or different PDCP data PDUs (or IP packets).
  • the source of the NC data segments included in a certain NC data segment group is not limited.
  • the NC data segment after network coding can be called NC network coded segment (NC network coded segment).
  • Multiple NC data segments in an NC data segment group are multiple after network coding.
  • the NC coded data segment can be referred to as the NC coded data segment group.
  • FIG. 8 is a schematic block diagram of an NC data PDU provided by an embodiment of the present application.
  • the header of the NC coded data segment includes at least the group number (group number, GN) of the NC coded data segment group to which the NC coded data segment belongs, and the serial number (in -group sequence number, IGSN) and network coding related information.
  • Network coding related information includes information such as coding matrix or coding redundancy. In this application, there is no restriction on the specific content of the information related to network coding. You can refer to the provisions of the current agreement or the provisions of the future agreement.
  • the header of the NC data segment may also include an indication bit F, which is used to indicate the type of the NC PDU.
  • two NC PDUs are defined in this application: NC data PDU and NC control PDU.
  • the NC data PDU carries the data sent by the NC layer of the second node, and the NC control PDU carries the feedback information sent by the NC layer of the first node.
  • the specific form of the indicator bit is not limited in the embodiments of this application. It can be the indicator information that occupies 1 bit as described above, or the indicator information that occupies 2 bits or more, or it can be related to NC PDU.
  • the indication information sent separately for example, before the first node or the second node receives a certain NC PDU, the indication information indicating the type of the NC PDU is received, and for example, a certain NC is received at the first node or the second node After the PDU, the indication information indicating the type of the NC PDU is received. For example, when the first node or the second node receives a certain NC PDU, the indication information indicating the type of the NC PDU is received.
  • NC data PDUs generated from all N-coded C data segments in an NC-coded data segment group form an NC data PDU group. Since the NC coded data segments included in the NC coded data segment group and NC data PDU group respectively correspond to the NC data PDU, the GN of the NC coded data segment group and the NC data PDU group are the same, and the NC in the NC coded data segment group The coded data segment is the same as the IGSN of the NC data PDU in the NC data PDU group.
  • NC data PDU the protocol stack of the second node as the protocol stack shown in Figures 4 and 5 as an example to illustrate how the second node generates the NC data PDU group, which does not constitute any limitation on the scope of protection of this application.
  • the specific form of the two-node protocol stack is in addition to those shown in FIG. 4 and FIG. 5, which will not be illustrated one by one here.
  • NC data PDU the aforementioned data to be transmitted at the NC layer
  • it may also be referred to as data or simply PDU.
  • FIG. 9 is a schematic diagram of an NC layer data processing flow provided by an embodiment of the present application.
  • the NC layer divides the PDCP data PDU received from the upper layer (PDCP layer) into k NC data segments, and sets the k NC data segments X 1 , X 2 ,..., X k as a group
  • the NC data segment group is network-encoded (the encoding matrix is C) to generate l NC-encoded data segments Y 1 , Y 2 ,..., Y k , and then add a header to each NC-encoded data segment in the l NC-encoded data segments, Generate 1 NC data PDU.
  • the l NC coded data segments form an NC coded data segment group
  • the corresponding l NC data PDUs form an NC data PDU group.
  • NC data PDU group corresponds to the NC coded data segment group one-to-one, and the group number is marked as g.
  • Fig. 10 is an example of NC data PDU corresponding to the NC coded data segment.
  • Fig. 10 is a schematic diagram of another NC data PDU provided by an embodiment of the present application.
  • each NC data PDU includes the group number of the NC data PDU group to which the NC data PDU belongs.
  • the second node may send the NC data PDU to the first node through the multiple intermediate nodes.
  • the first node is the UE shown in FIG. 6, and the second node is the CU in the IAB-donor shown in FIG. 6, the IAB-donor can pass through the first IAB-node, the second IAB-node, and the first IAB-node.
  • Three IAB-node sends NC data PDU to UE.
  • the first node after receiving the NC data PDU sent by the second node, the first node sends first feedback information to the second node, and the first feedback information is used to instruct the first node to receive the at least one NC The status of the NC data PDU in the data PDU group.
  • the method flow shown in FIG. 7 further includes S730, the first node sends the first feedback information to the second node.
  • the specific information fed back by the first feedback information includes the following two situations:
  • Case 1 The NC data PDU received by the first node is part of the NC data PDU included in the first NC data PDU group, that is, the above NC data PDUs sent by the second node to the first node are all in one NC data PDU group NC data PDU.
  • case one can be described as the first node receiving one or more first NC data PDUs, the one or more first NC data PDUs belong to the first NC data PDU group, and the one or more first NC data PDUs
  • the NC data PDU includes the group number of the first NC data PDU group.
  • the aforementioned first feedback information can be used to notify the second NC data PDU group.
  • Node The first node can decode the NC data segment group.
  • the second node may no longer need to send to the first node NC data PDUs in the first NC data PDU group other than the aforementioned first NC data PDU.
  • This can reduce unnecessary NC data PDU transmission;
  • the second node can learn that the first node has received part of the NC data PDU in the first NC data PDU group to complete the decoding, and the second node
  • the coding mode can be adjusted based on the first feedback information of the first node to reduce coding redundancy.
  • the first feedback information includes the group number of the first NC data PDU group; or, the first feedback information includes the group number of the first NC data PDU group and the first NC data PDU is in the first NC data PDU group Serial number.
  • the first feedback information may be carried in the first NC control PDU, and the first feedback information may also include first indication information, and the first indication information is used to indicate the type of the NC PDU.
  • the format of the first NC control PDU carrying the first feedback information is shown in Figure 11(a) and Figure 11(a) ACK_GN represents the group number of the first NC data PDU group; when the first feedback information includes the group number of the first NC data PDU group and the sequence number of the first NC data PDU in the first NC data PDU group, the first NC data PDU group is carried.
  • the format of the first NC control PDU of the feedback information is shown in Figure 11(b), ACK_GN shown in Figure 11(b) represents the group number of the first NC data PDU group, and ACK_IGSN#1 represents the first NC The sequence number of the data PDU in the first NC data PDU group, and multiple ACK_IGSN#1 respectively represent the sequence numbers of the multiple first NC data PDUs in the first NC data PDU group.
  • the second node may also send to the first node a second NC data PDU in the first NC data PDU group except for the first NC data PDU that has been sent. From the above, it can be seen that the first node can complete decoding after receiving the first NC data PDU in the first NC data PDU group, that is, from the perspective of whether the first node can achieve decoding, the second NC data PDU may not be sent to the first node. , Then the second NC data PDU in the embodiment of the present application may be referred to as a redundant NC data PDU.
  • the first node receives the second NC data PDU from the second node. For example, after the first node sends the aforementioned first feedback information, if it receives an NC data PDU in the first NC data PDU group, the first node considers the received NC data PDU to be a redundant NC data PDU .
  • the first node before the first node sends the first feedback information to the second node, receives the second NC data PDU from the second node. For example, if the first node has received the second NC data PDU before sending the first feedback information, the first node considers that it can be used to decode the first NC data PDU corresponding to the first NC data PDU group.
  • the second NC data PDU besides the NC data PDU is a redundant NC data PDU.
  • the first node when the first node sends the first feedback information to the second node, the first node receives the second NC data PDU from the second node. For example, when the first node receives the second NC data PDU when sending the first feedback information, and the first node knows that it can complete the decoding, the first node considers the received second NC data PDU to be redundant NC data PDU.
  • the method flow shown in FIG. 7 further includes S731.
  • the second node sends the second NC data PDU to the first node.
  • the aforementioned second NC data PDU may be that the first node receives the second NC data PDU in the first NC data PDU group sent by the second node within a certain period of time.
  • the first node learns the time period may be pre-defined by the protocol, negotiated between the first node and the second node, or configured by the first node. Configured on the second node.
  • the aforementioned second NC data PDU may be that the first node receives the second NC data PDU from the second node within a certain period of time after sending the first feedback information to the second node. ; As another possible implementation, the aforementioned second NC data PDU may be received within a certain period of time since the first node receives the first NC data PDU in the aforementioned first NC data PDU group NC data PDU from the second node other than the above-mentioned first NC data PDU.
  • the method flow shown in FIG. 7 further includes S732.
  • the first node sends second feedback information to the second node.
  • the second feedback information includes the sequence number of the second NC data PDU in the first NC data PDU group, and/or the number of the second NC data PDU.
  • the second feedback information may be carried in the second NC control PDU, and the second feedback information may also include second indication information, and the second indication information is used to indicate the type of the NC PDU.
  • the first node sends the above-mentioned first feedback information to the second node and also sends the above-mentioned second feedback information to the second node, it can be added to the header of the NC control PDU that carries the second feedback information.
  • the distinction information is used to distinguish the first NC control PDU that carries the first feedback information and the second NC control PDU that carries the second feedback information.
  • the format of the second NC control PDU carrying the second feedback information is shown in Figure 12(c) and Figure 12(d).
  • the first node may not send the aforementioned second feedback information to the second node.
  • the first node feeds back to the second node through the first feedback information.
  • the NC data segment group corresponding to the first NC data PDU group can be obtained by decoding part of the NC data PDU in the first NC data PDU group, and the first NC data PDU group is decoded to obtain the NC data segment group corresponding to the first NC data PDU group.
  • the node can feed back the reception status of the redundant NC data PDU through the second feedback information.
  • the second node can adjust the coding scheme based on the feedback information of the first node.
  • the second node encodes the first NC data segment group to obtain the first NC data PDU group
  • the first NC data PDU group includes 10 NC data PDUs
  • the second node transmits to the first node through the same or different transmission paths The 10 NC data PDUs.
  • the first node receives 5 NC data PDUs out of the 10 NC data PDUs, and determines that the first NC data segment group can be decoded
  • the first node sends first feedback information to the second node to inform the second node that it has Can be successfully decoded.
  • a possible implementation is that after the second node learns that the first node can decode the first NC data segment group, it does not send the remaining 5 NC data PDUs to the first node, which can reduce the number of NC data PDUs sent by the second node. The number of times, thereby saving the overhead of sending NC data PDU;
  • the second node after the second node learns that the first node can decode the first NC data segment group, it can also send 2 NC data PDUs to the first node, and the first node receives the 2 NC data PDUs. After the PDU, the second feedback information is sent to the second node to inform the second node that the 2 NC data PDUs have been successfully received.
  • the second node knows that the NC data PDU in the first NC data PDU group has a higher probability of being successfully sent, and the first node can decode and obtain the first NC data segment group based on 5 NC data PDUs, and the second node compresses and encodes In this way, when the first NC data PDU group corresponding to the first NC data segment group is sent again, 7 NC data PDUs can be obtained by encoding.
  • Case 2 The multiple NC data PDUs received by the first node are all or part of the NC data PDUs included in the multiple NC data PDU groups.
  • the above-mentioned first feedback information may be used to feed back the reception situation of the first node for NC data PDUs in multiple NC data PDU groups.
  • the first node receives the first network coding layer NC data protocol data unit data PDU and the third NC data PDU from the second node.
  • the first NC data PDU includes the group number of the first NC data PDU group, and the third NC data
  • the PDU includes the group number of the third NC data PDU group; the first node sends first feedback information to the second node, and the first feedback information is used to instruct the first node to receive the first NC data PDU group. 1.
  • the first feedback information includes the group number of the first NC data PDU group, the sequence number of the first NC data PDU in the first NC data PDU group, and the third NC data PDU group And the sequence number of the third NC data PDU in the third NC data PDU group.
  • the first feedback information may also be carried in the NC control PDU, and the first feedback information may also include first indication information, which is used to indicate the type of the NC PDU.
  • the format of the NC control PDU carrying the first feedback information is shown in Figure 13(a).
  • the first feedback information includes the group number of the first NC data PDU group, the sequence number of the first NC data PDU in the first NC data PDU group, and the third NC data PDU The group number of the group and the sequence number of the third NC data PDU in the third NC data PDU group.
  • the format of the NC control PDU carrying the first feedback information is shown in Figure 13(b).
  • the first feedback information includes a statistical value
  • the statistical value is used to indicate the number or number of successful receptions of NC data PDUs in the third NC data PDU group and the first NC data PDU group. Probability, the number or probability of reception failure, whether the number or probability of reception success is higher or lower than the threshold, or whether the number or probability of reception failure is higher or lower than the threshold.
  • the format of the NC control PDU carrying the first feedback information is shown in Figure 13(c).
  • the probability of successful reception can be defined as follows: Assuming that the number of NC data PDUs in a certain group is 1, and m of them are received, the probability of successful reception of the NC data PDUs of the group is m/l, and the same is true for reception failures. The probability is defined as 1-m/l.
  • the data transmission method provided in the embodiment of the present application can be applied to the communication system shown in FIG. 1.
  • the network device in the communication system shown in FIG. 1 is an IAB network device
  • a possible implementation is applied to the IAB network shown in FIG. 4.
  • the first node is UE
  • the second node is the CU in the IAB-donor; or, the first node may be the UE, and the second node is the CU in the IAB-donor.
  • Another possible implementation is applied in the IAB network shown in Figure 5.
  • the first node is the MT in the IAB-node, and the second node is the DU in the IAB-donor; or, the first node is the DU in the IAB-donor;
  • the second node is the MT in the IAB-node, and the first node is the DU in the IAB-donor.
  • the size of the sequence numbers of the foregoing processes does not imply the order of execution.
  • the execution order of the processes should be determined by their functions and internal logic, and should not constitute any limitation to the implementation process of the embodiments of this application. .
  • FIG. 14 is a schematic diagram of a data transmission device 1400 proposed in the present application.
  • the apparatus 1400 includes a receiving unit 1410 and a sending unit 1420.
  • the receiving unit 1410 is configured to receive the network coding layer NC data protocol data unit data PDU from the second node, where the NC data PDU includes the group number of the NC data PDU group.
  • the sending unit 1420 is configured to send feedback information to the second node, where the feedback information is used to instruct the first node to receive the NC data PDU of the NC data PDU group.
  • the apparatus 1400 completely corresponds to the first node in the method embodiment, and the apparatus 1400 may be the first node in the method embodiment, or a chip or functional module inside the first node in the method embodiment.
  • the corresponding unit of the device 1400 is used to execute the corresponding steps executed by the first node in the method embodiment shown in FIG. 7.
  • the receiving unit 1410 in the device 1400 executes the step of receiving by the first node in the method embodiment. For example, step S720 in FIG. 7 is executed to receive the NC data PDU from the second node, and step S731 in FIG. 7 is also executed to receive the second NC data PDU from the second node.
  • the sending unit 1420 in the device 1400 executes the steps sent by the first node in the method embodiment. For example, step S730 in FIG. 7 is executed to send the first feedback information to the second node, and step S732 in FIG. 7 is also executed to send the second feedback information to the second node.
  • the apparatus 1400 may further include a processing unit, configured to perform internal processing steps of the first node, for example, perform decoding steps.
  • the sending unit 1420 and the receiving unit 1410 may constitute a transceiver unit, and have the functions of receiving and sending at the same time.
  • the processing unit may be a processor.
  • the sending unit may be a transmitter, and the receiving unit 1410 may be a receiver. The receiver and transmitter can be integrated to form a transceiver.
  • FIG. 15 is a schematic structural diagram of a first node 1500 applicable to an embodiment of the present application, and may be used to implement the function of the first node in the foregoing data transmission method.
  • the first node 1500 includes a processor 1510, a memory 1520, and a transceiver 1530.
  • the memory 1520 stores instructions or programs
  • the processor 1530 is configured to execute instructions or programs stored in the memory 1520.
  • the transceiver 1530 is used to execute the operations performed by the sending unit 1420 and the receiving unit 1410 in the apparatus 1400 shown in FIG. 14.
  • the first node 1500 shown in FIG. 15 can implement the function of the first node involved in the method embodiment of FIG. 7.
  • each unit in the first node 1500 is respectively for implementing the corresponding process performed by the first node in the method embodiment of the present application. To avoid repetition, detailed description is omitted here.
  • the structure of the first node illustrated in FIG. 15 is only a possible form, and should not constitute any limitation in the embodiment of the present application. This application does not exclude the possibility of other forms of first node structures that may appear in the future.
  • FIG. 16 is a schematic diagram of a data transmission apparatus 1600 proposed in the present application. As shown in FIG. 16, the apparatus 1600 includes a sending unit 1610 and a receiving unit 1620.
  • the sending unit 1610 is configured to send the network coding layer NC data protocol data unit data PDU to the first node, where the NC data PDU includes the group number of the NC data PDU group;
  • the receiving unit 1620 is configured to receive feedback information from the first node, where the feedback information is used to indicate that the first node receives the NC data PDU of the NC data PDU group.
  • the apparatus 1600 completely corresponds to the second node in the method embodiment, and the apparatus 1600 may be the second node in the method embodiment, or a chip or functional module inside the second node in the method embodiment.
  • the corresponding unit of the apparatus 1600 is used to execute the corresponding steps executed by the second node in the method embodiment shown in FIG. 7.
  • the sending unit 1610 in the apparatus 1600 executes the steps sent by the second node in the method embodiment. For example, step S720 in FIG. 7 is executed to send the NC data PDU to the first node, and step S731 in FIG. 7 is also executed to send the second NC data PDU to the first node.
  • the receiving unit 1620 in the device 1600 executes the steps received by the second node in the method embodiment, for example, executes step S730 in FIG. 7 to receive the first feedback information from the first node, and also executes step S732 in FIG. 7 to receive The second feedback information from the first node.
  • the apparatus 1600 may further include a processing unit, configured to execute steps implemented or processed internally by the second node. For example, step S710 in FIG. 7 is performed to generate at least one NC data PDU group.
  • the sending unit 1610 and the receiving unit 1620 may constitute a transceiver unit, and have the functions of receiving and sending at the same time.
  • the processing unit may be a processor.
  • the sending unit 1610 may be a transmitter.
  • the receiving unit 1620 may be a receiver. The receiver and transmitter can be integrated to form a transceiver.
  • FIG. 17 is a schematic structural diagram of a second node 1700 applicable to an embodiment of the present application, and may be used to implement the function of the second node in the foregoing data transmission method.
  • the second node 1700 includes a processor 1710, a memory 1720, and a transceiver 1730.
  • the memory 1720 stores instructions or programs
  • the processor 1730 is configured to execute instructions or programs stored in the memory 1720.
  • the transceiver 1730 is used to execute the operations performed by the sending unit 1610 and the receiving unit 1620 in the apparatus 1400 shown in FIG. 16.
  • the second node 1700 shown in FIG. 17 can implement the function of the second node involved in the method embodiment of FIG. 7.
  • each unit in the second node 1700 is respectively for implementing the corresponding process executed by the second node in the method embodiment of the present application. To avoid repetition, detailed description is omitted here.
  • the structure of the second node illustrated in FIG. 17 is only a possible form, and should not constitute any limitation in the embodiment of the present application. This application does not exclude the possibility of other forms of second node structures that may appear in the future.
  • An embodiment of the present application also provides a communication system, which includes the aforementioned first node and second node.
  • the present application also provides a computer-readable storage medium that stores instructions in the computer-readable storage medium.
  • the computer executes the steps executed by the first node in the method shown in FIG. Various steps.
  • the present application also provides a computer-readable storage medium that stores instructions in the computer-readable storage medium.
  • the computer executes the steps performed by the second node in the method shown in FIG. 7 above. Various steps.
  • This application also provides a computer program product containing instructions.
  • the computer program product runs on a computer, the computer executes the steps performed by the first node in the method shown in FIG. 7.
  • This application also provides a computer program product containing instructions.
  • the computer program product runs on a computer, the computer executes the steps performed by the second node in the method shown in FIG. 7.
  • the application also provides a chip including a processor.
  • the processor is used to read and run a computer program stored in the memory to execute the corresponding operation and/or process executed by the first node in the data transmission method provided in this application.
  • the chip further includes a memory, the memory and the processor are connected to the memory through a circuit or a wire, and the processor is used to read and execute the computer program in the memory.
  • the chip further includes a communication interface, and the processor is connected to the communication interface.
  • the communication interface is used to receive data and/or information to be processed, and the processor obtains the data and/or information from the communication interface, and processes the data and/or information.
  • the communication interface may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip.
  • the processor may also be embodied as a processing circuit or a logic circuit.
  • the application also provides a chip including a processor.
  • the processor is used to read and run the computer program stored in the memory to execute the corresponding operation and/or process executed by the second node in the data transmission method provided in this application.
  • the chip further includes a memory, the memory and the processor are connected to the memory through a circuit or a wire, and the processor is used to read and execute the computer program in the memory.
  • the chip further includes a communication interface, and the processor is connected to the communication interface.
  • the communication interface is used to receive data and/or information to be processed, and the processor obtains the data and/or information from the communication interface, and processes the data and/or information.
  • the communication interface may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip.
  • the processor may also be embodied as a processing circuit or a logic circuit.
  • the above-mentioned chip can also be replaced with a chip system, which will not be repeated here.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disks or optical disks and other media that can store program codes. .
  • the term "and/or” in this application is only an association relationship that describes associated objects, which means that there can be three types of relationships, for example, A and/or B, which can mean that A alone exists, and both A and B exist. , There are three cases of B alone.
  • the character "/" in this document generally means that the associated objects before and after are in an "or” relationship; the term “at least one” in this application can mean “one” and "two or more", for example, A At least one of, B and C can mean: A alone exists, B alone exists, C alone exists, A and B exist alone, A and C exist at the same time, C and B exist at the same time, A and B and C exist at the same time, this Seven situations.

Abstract

La présente invention concerne un procédé et un appareil de transmission de données, pouvant être appliqués à un réseau IAB qui est introduit dans une couche NC. Le procédé de transmission de données comprend : un second nœud génère un ou plusieurs ensemble(s) de PDU de données NC, et envoie à un premier nœud tout ou partie des PDU de données NC comprises dans chaque ensemble de PDU de données NC parmi lesdits ensembles de PDU de données NC ; le premier nœud reçoit les PDU de données NC et envoie ensuite des premières informations de rétroaction au second nœud, et notifie au second nœud une situation où le premier nœud reçoit les PDU de données NC dans lesdits ensembles de PDU de données NC, de telle sorte que le second nœud puisse ainsi connaître la situation de réception du premier nœud en ce qui concerne les PDU de données NC dans lesdits ensembles de PDU de données NC, et le surdébit de rétroaction est réduit.
PCT/CN2019/108225 2019-09-26 2019-09-26 Procédé et appareil de transmission de données WO2021056345A1 (fr)

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