WO2020221296A1 - 数据传输的方法和装置 - Google Patents

数据传输的方法和装置 Download PDF

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Publication number
WO2020221296A1
WO2020221296A1 PCT/CN2020/087781 CN2020087781W WO2020221296A1 WO 2020221296 A1 WO2020221296 A1 WO 2020221296A1 CN 2020087781 W CN2020087781 W CN 2020087781W WO 2020221296 A1 WO2020221296 A1 WO 2020221296A1
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Prior art keywords
iab node
base station
donor base
node
information
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PCT/CN2020/087781
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English (en)
French (fr)
Inventor
卓义斌
戴明增
刘菁
朱元萍
曹振臻
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP20798084.8A priority Critical patent/EP3955630A4/en
Publication of WO2020221296A1 publication Critical patent/WO2020221296A1/zh
Priority to US17/512,905 priority patent/US20220053370A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/34—Flow control; Congestion control ensuring sequence integrity, e.g. using sequence numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0284—Traffic management, e.g. flow control or congestion control detecting congestion or overload during communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0289—Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/086—Load balancing or load distribution among access entities
    • H04W28/0861—Load balancing or load distribution among access entities between base stations
    • H04W28/0864—Load balancing or load distribution among access entities between base stations of different hierarchy levels, e.g. Master Evolved Node B [MeNB] or Secondary Evolved node B [SeNB]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H04W28/12—Flow control between communication endpoints using signalling between network elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

Definitions

  • This application relates to the field of communications, and more specifically, to methods and devices for data transmission in the field of communications.
  • a wireless backhaul network for example, an integrated access and backhaul (IAB) network includes a host node and a wireless backhaul node, and the terminal device is connected to the host node through the wireless backhaul node.
  • the IAB network supports multi-hop and multi-connection networking. Therefore, there may be multiple transmission paths between the terminal device and the host node.
  • On a certain transmission path between a terminal device and a wireless backhaul node that provides wireless access services for the terminal device, between wireless backhaul nodes, wireless backhaul nodes, and those that provide backhaul services for the wireless backhaul node There is a definite hierarchical relationship between the host nodes.
  • the node that provides backhaul services for the wireless backhaul node is called the wireless backhaul node or the parent node of the terminal device, or the node that provides access services for the terminal device is called It is the parent node of the terminal device, the wireless backhaul node can be regarded as the child node of the parent node of the wireless backhaul node, and the terminal device can be regarded as the child node of the parent node of the terminal device.
  • the donor base station is a distributed unit (DU) and a centralized unit, CU) separate state.
  • the DU needs to send a downlink data delivery status (DDDS) feedback message to the CU,
  • DDDS feedback message includes that the DU has successfully sent multiple data packets to the terminal device in sequence.
  • PDCP Packet Data Convergence Protocol
  • PDU Protocol Data Unit
  • sequence number (Sequence Number, SN) has the largest value.
  • the PDCP PDU SN value of the data packet but because the DDDS feedback message is based on the terminal device data radio bearer (DRB) granularity, and can be fed back on the IAB node that the terminal device accesses.
  • DRB terminal device data radio bearer
  • the IAB node accessed by the terminal device sends a DDDS feedback message to the CU. It is impossible to determine whether the terminal device and the terminal device are connected.
  • the access link between the incoming IAB nodes or the backhaul link between the IAB node accessed by the terminal device and the CU is congested.
  • each IAB node sends an overload message to the DU.
  • the overload message Two states of the node are indicated, namely overload and non-overload.
  • the CU uses the overload message to control the access of the terminal device.
  • the state of the node indicated by the overload message is limited, and the CU cannot better allocate corresponding resources for data transmission through the two states.
  • the present application provides a data transmission method and device, which can effectively improve data transmission performance.
  • a data transmission method is provided, which is applied to a communication system including a donor base station, a first access and backhaul integrated IAB node, wherein the first IAB node is an access node of a terminal device ,
  • the method includes: the first IAB node receives N data packets sent by the donor base station to the terminal device, where N is a positive integer, and the N is greater than 1; the first IAB node, Determine the protocol data unit serial number PDCP PDU SN of the packet data convergence protocol of the first data packet from the N data packets, and the PDCP PDU SN of the first data packet is the largest PDCP PDU among the N data packets
  • the SN or the PDCP PDU SN of the first data packet is the PDCP PDU SN of the N data packets arranged in ascending order and continuous from the smallest PDCP PDU SN to the largest PDCP PDU SN in the PDCP PDU SN; so
  • the first IAB node sends first
  • the first IAB node receives N data packets sent by the donor base station to the terminal device, and determines the first data packet from the N data packets.
  • the PDCP PDU SN of the first data packet is the largest PDCP among the N data packets
  • the data packet of PDU SN or the PDCP PDU SN of the first data packet is the PDCP PDU SN of N data packets arranged in ascending order and continuous from the smallest PDCP PDU SN.
  • the largest PDCP PDU SN of the PDCP PDU SN is the largest PDCP among the N data packets.
  • An IAB node sends the status of the first data packet received by the first IAB node to the donor base station, so that the first IAB node can send the status of the data packet received by the first IAB node to the donor base station, so that the donor base station can perform corresponding operations , Thereby effectively improving data transmission performance.
  • the method further includes: the first IAB node sends second information to the donor base station, where the second information is used to indicate whether the first transmission path occurs Congestion or failure; in the case where the first IAB node communicates with the donor base station via the second IAB node, the first transmission path includes the return path between the first IAB node and the second IAB node A transmission link and a backhaul link between the second IAB node and the donor base station.
  • the first IAB node sends to the donor base station whether the backhaul link between the first IAB node and the second IAB node and the backhaul link between the second IAB node and the donor base station are congested or failed, so that the donor base station can respond accordingly The operation, thereby effectively improving the data transmission performance.
  • the first transmission path is between the first IAB node and the donor node Backhaul link.
  • the method further includes: the first IAB node receives third information from the second IAB node, and the third information is used to indicate the second Whether the backhaul link between the IAB node and the donor base station is congested or fails.
  • the first IAB node receives whether the backhaul link between the second IAB node and the donor base station is congested or failed, so that the first IAB node subsequently sends the backhaul chain between the second IAB node and the donor base station to the donor base station Whether the road is congested or failed.
  • the first information is included in a user plane message of an F1 interface between the first IAB node and the donor base station.
  • the user plane message of the F1 interface is on the equivalent F1 protocol layer between the first IAB node and the donor base station.
  • the first information is included in the user plane message of the F1 interface, so that the signaling overhead can be reduced.
  • the second information is included in a user plane message of an F1 interface between the first IAB node and the donor base station.
  • the second information is included in the user plane message of the F1 interface, thereby reducing signaling overhead.
  • the user plane message of the F1 interface further includes a first identifier and/or a second identifier, and the first identifier is used to indicate the user plane message of the F1 interface
  • the first information is included in the F1 interface
  • the second identifier is used to indicate that the user plane message of the F1 interface includes the second information.
  • the subsequent donor base station can correctly interpret the length of the user plane message of the F1 interface, and enable the donor base station to determine whether the user plane message of the F1 interface contains First information.
  • a data transmission method is provided, which is applied to a communication system including a donor base station and a first access and backhaul integrated IAB node, wherein the first IAB node is an access node of a terminal device ,
  • the method includes: the donor base station sends N data packets to the first IAB node, the N data packets are data packets sent by the donor base station to the terminal device, and the N is a positive integer , And the N is greater than 1; the donor base station receives the first information sent by the first IAB node, and the first information includes the serial number of the protocol data unit PDCP PDU SN of the packet data convergence protocol of the first data packet Value; where the PDCP PDU SN of the first data packet is the largest PDCP PDU SN of the N data packets or the PDCP PDU SN of the first data packet is the PDCP PDU SN of the N data packets according to Arrange from the smallest to the largest and continue from the smallest PDCP PDU
  • the donor base station sends N data packets to the first IAB node, and receives the PDCP PDU SN value of the first data packet sent by the first IAB node, and the PDCP PDU SN of the first data packet is the largest PDCP among the N data packets PDU SN or PDCP PDU SN of N data packets are arranged in ascending order and continuous from the smallest PDCP PDU SN.
  • the congestion or failure of the first transmission path can be determined, so that the donor base station can determine the backhaul link and the second link between the first IAB node and the second IAB node according to the specific data packet received by the first IAB node. Whether the backhaul link between the IAB node and the donor base station is congested or failed, the donor base station can thus know the congestion or failure of the current transmission path.
  • the method further includes: the donor base station receiving second information sent by the first IAB node, where the second information is used to indicate the first transmission Whether the path is congested or failed.
  • the donor base station receives whether the first transmission path sent by the first IAB node is congested or failed, so that the donor base station can learn the congestion or failure of the first transmission path.
  • the first transmission path is between the first IAB node and the donor node Backhaul link.
  • the donor base station determining the congestion or failure of the first transmission path according to the first information includes: the donor base station according to the first information and the The second information determines the congestion or failure of the first transmission path.
  • the donor base station determining the congestion or failure of the first transmission path according to the first information and the second information includes: the donor base station according to The value of the PDCP PDU SN of the first data packet and the value of the PDCP PDU SN of the second data packet sent by the donor base station determine whether there is congestion or failure of the first transmission path, wherein the first transmission path
  • the PDCP PDU SN of the second data packet is the largest PDCP PDU SN among the L data packets that the donor base station has sent, L ⁇ N, and L is a positive integer; in the case of congestion or failure in the first transmission path ,
  • the donor base station determines a congested or failed link in the first transmission path according to the second information.
  • the donor base station can determine whether the first transmission path is congested or failed according to the comparison of the PDCP PDU SN value of the first data packet and the PDCP SN value of the second data packet. In the case of congestion or failure of the first transmission path, The donor base station determines the congested or failed link in the first transmission path according to the second information, so that the donor base station can subsequently perform corresponding operations on the congested or failed link in the first transmission path to provide data transmission performance.
  • the method further includes: in the case of a congested or failed link in the first transmission path, the donor base station responds to the congested or failed link The link changes path.
  • the donor base station changes the path of the congested or failed link to avoid or reduce the congestion on the first transmission path and improve the performance of data transmission.
  • the first information is included in a user plane message of an F1 interface between the first IAB node and the donor base station.
  • the user plane message of the F1 interface is on the equivalent F1 protocol layer between the first IAB node and the donor base station.
  • the first information is included in the user plane message of the F1 interface, so that the signaling overhead can be reduced.
  • the second information is included in a user plane message of the F1 interface between the first IAB node and the donor base station.
  • the second information is included in the user plane message of the F1 interface, thereby reducing signaling overhead.
  • the user plane message of the F1 interface further includes a first identifier and/or a second identifier, and the first identifier is used to indicate the user plane message of the F1 interface
  • the first information is included in the F1 interface
  • the second identifier is used to indicate that the user plane message of the F1 interface includes the second information.
  • the user plane message includes the first identifier and/or the second identifier, so that the donor base station can correctly interpret the length of the user plane message of the F1 interface, and enable the donor base station to determine whether the user plane message of the F1 interface contains the second information.
  • a data transmission method is provided, which is applied to a communication system including a donor base station, a first access and backhaul integrated IAB node, and a second IAB node, wherein the first IAB node is a terminal
  • the access node of the device, the first IAB node communicates with the donor base station via the second IAB node, and the method includes: the first IAB node receives fourth information from the second IAB node, so The fourth information is used to indicate whether the second transmission path is congested or failed, where the second transmission path is the backhaul link between the second IAB node and the donor base station; the first IAB The node sends fifth information to the donor base station, where the fifth information is used to indicate whether the third transmission path is congested or fails, and the third transmission path includes the first IAB node and the second IAB The backhaul link between nodes and/or the second transmission path.
  • the first IAB node receives from the second IAB node whether the second transmission path between the second IAB node and the donor base station is congested or fails, and the first IAB node sends a response between the first IAB node and the second IAB node.
  • the transmission link congestion situation and the backhaul link congestion situation between the second IAB node and the donor base station are sent to the donor base station, so that the donor base station learns the link congestion status and the first IAB node between the first IAB node and the second IAB node. 2.
  • the fifth information is included in a user plane message of an F1 interface between the first IAB node and the donor base station.
  • the user plane message of the F1 interface is on the equivalent F1 protocol layer between the first IAB node and the donor base station.
  • the fifth information is included in the user plane message of the F1 interface, so that the signaling overhead can be reduced.
  • the user plane message of the F1 interface further includes a third identifier, and the third identifier is used to indicate that the user plane message of the F1 interface includes the fifth information.
  • the third identifier is included in the user plane message of the F1 interface, so that the subsequent donor base station can correctly interpret the length of the user plane message of the F1 interface, and enables the donor base station to determine whether the user plane message of the F1 interface contains the fifth information .
  • a data transmission method is provided, which is applied to a communication system including a donor base station, a first access and backhaul integrated IAB node, and a second IAB node, wherein the first IAB node is a terminal
  • the access node of the device, the first IAB node communicates with the donor base station via the second IAB node, and the method includes: the donor base station receives fifth information sent by the first IAB node, and The fifth information is used to indicate whether the third transmission path is congested or failed, where the third transmission path includes the backhaul link between the first IAB node and the second IAB node and/or the The backhaul link between the second IAB node and the donor base station; the donor base station determines the congested or failed link of the third transmission path according to the fifth information.
  • the donor base station learns the congestion of the link between the first IAB node and the second IAB node and the congestion of the backhaul link between the second IAB node and the donor base station, so that the donor base station can follow up on the first IAB node and the second IAB node. Corresponding measures are taken on the link between the IAB nodes and the backhaul link between the second IAB node and the donor base station.
  • the method further includes: in the case that there is a congested or failed link in the third transmission path, the donor base station responds to the congested or failed link The link changes path.
  • the donor base station changes the path of the congested or failed link to the third transmission path, thereby avoiding or reducing the congestion on the third transmission path and improving data Transmission performance.
  • the fifth information is included in a user plane message of an F1 interface between the first IAB node and the donor base station.
  • the user plane message of the F1 interface is on the equivalent F1 protocol layer between the first IAB node and the donor base station.
  • the fifth information is included in the user plane message of the F1 interface, so that the signaling overhead can be reduced.
  • the user plane message of the F1 interface further includes a third identifier, and the third identifier is used to indicate that the user plane message of the F1 interface includes the fifth information.
  • the third identifier is included in the user plane message, so that the donor base station can correctly interpret the length of the user plane message of the F1 interface, and enables the donor base station to determine whether the user plane message of the F1 interface contains the fifth information.
  • a data transmission method is provided, which is applied to a communication system including a donor base station and a first access and backhaul integrated IAB node.
  • the method includes: the first IAB node determines the fourth transmission path Status level information; wherein the status level of the fourth transmission path includes one of the M status levels of the fourth transmission path, the M is greater than or equal to 2, and the M is a positive integer, the first The M status levels of the four transmission paths are divided according to the buffer occupancy rate of the fourth transmission path; the fourth transmission path is the return between the first IAB node and the parent node of the first IAB node Transmission link, and/or the fourth transmission path is a backhaul link between the first IAB node and the child nodes of the first IAB node; the first IAB node sends to the donor base station Sixth information, the sixth information is used to indicate the status level of the fourth transmission path, and the sixth information is included in the distributed unit status indication message of the donor base station.
  • the first IAB node includes the status level of the fourth transmission path determined by the first IAB node in the donor base station distributed unit status indication message, and sends it to the donor base station, thereby reducing signaling overhead, and at the same time, allowing the donor base station to know the first 4. Cache occupancy rate of transmission path.
  • the M status levels of the transmission path are specified by a communication protocol; or, the M status levels of the transmission path are configured by the donor base station.
  • a data transmission method which is applied to a communication system including a donor base station and a first integrated access and backhaul IAB node, the method includes: the donor base station receives the first IAB The sixth information sent by the node, where the sixth information is used to indicate the status level of the fourth transmission path, where the sixth information is included in the distributed unit status indication message of the donor base station, and the fourth
  • the status level of the transmission path includes one of the M status levels of the fourth transmission path, the M is greater than or equal to 2, and the M is a positive integer, and the M status levels of the fourth transmission path are based on
  • the fourth transmission path is divided by the buffer occupancy; the fourth transmission path is the backhaul link between the first IAB node and the parent node of the first IAB node, and/or the first IAB node
  • the fourth transmission path is the backhaul link between the first IAB node and the child nodes of the first IAB node; the donor base station reconfigures the uplink and downlink of the fourth transmission
  • the donor base station receives the sixth information sent by the first IAB node, where the sixth information indicates the status level of the fourth transmission path, and the donor base station can learn the buffer occupancy rate of the fourth transmission path. At the same time, the sixth information is included in the distributed unit status indication message of the donor base station, thereby reducing signaling overhead.
  • the reconfiguration of the uplink and downlink time slot resource allocation ratio of the fourth transmission path by the donor base station according to the sixth information includes: the donor base station according to the The sixth information determines the status level of the fourth transmission path; the donor base station reconfigures the uplink and downlink time slot resource allocation ratio of the fourth transmission path according to the status level of the fourth transmission path.
  • the donor base station can learn the buffer occupancy rate of the fourth transmission path according to the status level of the fourth transmission path, and the donor base station reconfigures the uplink and downlink time slot resource allocation ratio of the fourth transmission path according to the buffer occupancy rate of the fourth transmission path. Therefore, the donor base station can reasonably allocate the uplink and downlink time slot resources of the fourth transmission path according to the current occupancy rate of the buffer of the fourth transmission path, thereby improving data transmission performance.
  • the reconfiguration of the uplink and downlink time slot resource allocation ratio of the fourth transmission path by the donor base station according to the status level of the fourth transmission path includes: the donor The base station reconfigures the uplink and downlink time slot resource allocation ratio of the fourth transmission path according to the uplink and downlink time slot resource allocation ratio of the fourth transmission path last time.
  • the donor base station can reconfigure the uplink and downlink time slot resource allocation ratio of the fourth transmission path according to the uplink and downlink time slot resource allocation ratio of the fourth transmission path last time, so that the uplink and downlink time slot resources of the fourth transmission path can be reasonably performed. Distribution to improve data transmission performance.
  • the M status levels of the transmission path are specified by a communication protocol; or, the M status levels of the transmission path are configured by the donor base station.
  • a method for determining transmission path congestion is provided, which is applied to a communication system including a donor base station and a first integrated access and backhaul IAB node.
  • the method includes: the donor base station receives the first The seventh information sent by an IAB node, where the seventh information includes the PDCP PDU SN value of the third data packet and the terminal device data radio bearer UE DRB, and the PDCP PDU SN of the third data packet is the first IAB node
  • the largest PDCP PDU SN among the R data packets successfully sent to the terminal device in sequence or the largest PDCP PDU SN among the R data packets sent by the first IAB node to the terminal device, the R is greater than 1, and the R Is a positive integer;
  • the donor base station determines the congestion condition of the fifth transmission path according to the seventh information, where the fifth transmission path is the transmission path between the first IAB node and the donor base station and/or the first The access link between the IAB node and the terminal device.
  • the primary base station determining the congestion condition of the fifth transmission path according to the seventh information includes: the PDCP PDU SN value of the third data packet and the fourth The difference between the PDCP PDU SN value of the data packet is greater than or equal to the first threshold, the donor base station determines that the fifth transmission path is congested, and the PDCP PDU SN value of the fourth data packet is sent to the terminal by the donor base station
  • the largest PDCP PDU SN of the K data packets sent by the device, the K is greater than 1, and the K is a positive integer.
  • the donor base station determines whether the buffer size expected by the UE DRB is greater than or equal to the second threshold In the case that the buffer size expected by the UE DRB is greater than or equal to the second threshold, the donor base station may determine the first backhaul chain on the transmission path between the first IAB node and the donor base station When the path is congested, the first backhaul link is any backhaul link on the transmission path between the first IAB node and the donor base station; the buffer size expected by the UE DRB is lower than the second threshold Value, the donor base station determines that the access link between the first IAB node and the terminal device is congested.
  • the first threshold value is specified by a communication protocol, or the first threshold value is configured by the donor base station.
  • the second threshold value is specified by a communication protocol, or the second threshold value is configured by the donor base station.
  • the seventh information is included in a user plane message of an F1 interface between the first IAB node and the donor base station.
  • the user plane message of the F1 interface further includes a fourth identifier, and the fourth identifier is used to indicate that the user plane message of the F1 interface includes the seventh information.
  • a method for wireless backhaul link failure indication includes: a second IAB node determines wireless backhaul link failure indication information, and the wireless backhaul link failure indication information is used to indicate The wireless backhaul link between the second IAB node and its parent node fails or the radio resource control RRC re-establishment fails; the second IAB node sends wireless backhaul link failure indication information to the first node, and
  • the first node is a first IAB node or a terminal device, and the second IAB node is a parent node of the first node.
  • a method for indicating a wireless backhaul link failure includes: a first node receives wireless backhaul link failure indication information sent by a second IAB node, and the wireless backhaul link fails
  • the indication information is used to indicate that the wireless backhaul link between the second IAB node and its parent node fails or the radio resource control RRC re-establishment fails; the first node according to the wireless backhaul link failure indication information, Trigger RRC re-establishment or trigger cell reselection.
  • the first node determines that the link between the first node and the second IAB node fails or the The first node triggers RRC re-establishment.
  • the first node when the first node is in the RRC connected state and the first node is in the RRC idle state, the first node triggers cell reselection.
  • the first node can perceive the link status of the backhaul link between the second IAB node and the parent node of the second IAB node.
  • the first node can perform cell reselection or RRC re-establishment in advance to find a new parent node for access, which effectively reduces the cause The data transmission interruption time caused by the link failure of the backhaul link between the second IAB node and the parent node of the second IAB node or the RRC re-establishment failure.
  • a device for a wireless backhaul network includes a donor base station, a first access and backhaul integrated IAB node, and the device includes: a transceiver unit for receiving N data packets sent by the donor base station to the terminal device, where N is a positive integer, and N is greater than 1; the processing unit is configured to determine the grouping of the first data packet from the N data packets Data Convergence Protocol serial number PDCP PDU SN, the PDCP PDU SN of the first data packet is the largest PDCP PDU SN of the N data packets or the PDCP PDU SN of the first data packet is the N data packets
  • the PDCP PDU SNs are arranged in ascending order and continuous from the smallest PDCP PDU SN.
  • the largest PDCP PDU SN in the PDCP PDU SN the transceiver unit is also used to send first information to the donor base station, the The first information includes the value of
  • the transceiver unit is further configured to: send second information to the donor base station, where the second information is used to indicate whether the first transmission path is congested or fails;
  • the first transmission path includes a backhaul link between the apparatus and the second IAB node and the second IAB node Backhaul link with the donor base station.
  • the first transmission path is a backhaul between the first IAB node and the donor node link.
  • the transceiving unit is further configured to: receive the third information from the second IAB node, where the third information is used to indicate the second IAB node Whether the backhaul link with the donor base station is congested or failed.
  • the first information is included in a user plane message of an F1 interface between the first IAB node and the donor base station.
  • the second information is included in a user plane message of an F1 interface between the first IAB node and the donor base station.
  • the user plane message of the F1 interface further includes a first identifier and/or a second identifier, and the first identifier is used to indicate the user plane message of the F1 interface
  • the first information is included in the F1 interface
  • the second identifier is used to indicate that the user plane message of the F1 interface includes the second information.
  • a device for a wireless backhaul network includes a donor base station, a first access and backhaul integrated IAB node, and the device includes: a transceiver unit for Send N data packets to the first IAB node, the N data packets are data packets sent by the donor base station to the terminal device, the N is a positive integer, and the N is greater than 1; the transceiver unit , Is also used to receive first information sent by the first IAB node, where the first information includes the value of the PDCP PDU SN of the first data packet; where the PDCP of the first data packet PDU SN is the largest PDCP PDU SN of the N data packets or the PDCP PDU of the first data packet SN is the PDCP PDUs of the N data packets SN is arranged in ascending order and the smallest PDCP PDU The SN starts continuous PDCP PDU SN which is the largest PDCP PDU SN
  • the device further includes: the transceiver unit is further configured to receive second information sent by the first IAB node, where the second information is used to indicate Whether the first transmission path is congested or failed.
  • the first transmission path is between the first IAB node and the device Backhaul link.
  • the processing unit is specifically configured to determine the congestion or failure condition of the first transmission path according to the first information and the second information.
  • the processing unit is further specifically configured to: according to the value of the PDCP PDU SN of the first data packet and the PDCP PDU of the second data packet sent by the device The value of SN determines whether there is congestion or failure in the first transmission path, where the PDCP PDU SN of the second data packet is the largest PDCP PDU SN of the L data packets that the device has sent, so Said L ⁇ N, and said L is a positive integer; in the case of congestion or failure of the first transmission path, the processing unit is further specifically configured to: determine the first transmission according to the second information Congested or failed links in the path.
  • the processing unit when there is a congested or failed link in the first transmission path, is further configured to: Road change path.
  • the first information is included in a user plane message of an F1 interface between the first IAB node and the donor base station.
  • the second information is included in a user plane message of the F1 interface between the first IAB node and the donor base station.
  • the user plane message of the F1 interface further includes a first identifier and/or a second identifier, and the first identifier is used to indicate the user plane of the F1 interface
  • the message includes the first information
  • the second identifier is used to indicate that the user plane message of the F1 interface includes the second information.
  • a device for a wireless backhaul network includes a donor base station, a first access and backhaul integrated IAB node, and a second IAB node in a communication system
  • the first IAB node is an access node of the terminal device
  • the first IAB node communicates with the donor base station via the second IAB node
  • the apparatus includes: a transceiver unit, configured to receive The IAB node receives fourth information, where the fourth information is used to indicate whether the second transmission path is congested or failed, where the second transmission path is a backhaul between the second IAB node and the donor base station Link;
  • the transceiver unit is also used to send fifth information to the donor base station, the fifth information is used to indicate whether the third transmission path is congested or failed, and the third transmission path is the first The backhaul link between the IAB node and the second IAB node and the second transmission path.
  • the fifth information is included in a user plane message of an F1 interface between the first IAB node and the donor base station.
  • the user plane message of the F1 interface further includes a third identifier, and the third identifier is used to indicate that the user plane message of the F1 interface includes the first Five information.
  • an apparatus for a wireless backhaul network includes a donor base station, a first access and backhaul integrated IAB node, and a second IAB node in a communication system, wherein ,
  • the first IAB node is an access node of the terminal equipment, the first IAB node communicates with the donor base station via the second IAB node, and the apparatus includes: a transceiver unit, configured to receive the first The fifth information sent by the IAB node, where the fifth information is used to indicate whether the third transmission path is congested or failed, where the third transmission path is between the first IAB node and the second IAB node And the backhaul link between the second IAB node and the donor base station; a processing unit, configured to determine the congested or failed chain of the third transmission path according to the fifth information road.
  • the processing module is further configured to: Road change path.
  • the fifth information is included in a user plane message of an F1 interface between the first IAB node and the donor base station.
  • the user plane message of the F1 interface further includes a third identifier, and the third identifier is used to indicate that the user plane message of the F1 interface includes the first Five information.
  • a device for a wireless backhaul network which is applied to a communication system including a donor base station and a first integrated access and backhaul IAB node.
  • the device includes: a processing unit configured to determine Four status level information of the transmission path; wherein the status level of the fourth transmission path includes one of the M status levels of the fourth transmission path, the M is greater than or equal to 2, and the M is a positive integer , The M status levels of the fourth transmission path are divided according to the buffer occupancy of the fourth transmission path; the fourth transmission path is the parent node of the first IAB node and the first IAB node And/or the fourth transmission path is the backhaul link between the first IAB node and the child nodes of the first IAB node; the transceiver unit is configured to send the The donor base station sends sixth information, where the sixth information is used to indicate the status level of the fourth transmission path, and the sixth information is included in the distributed unit status indication message of the donor base station.
  • the M status levels of the transmission path are specified by a communication protocol; or, the M status levels of the transmission path are configured by the donor base station.
  • a device for a wireless backhaul network which is applied to a communication system including a donor base station and a first integrated access and backhaul IAB node.
  • the device includes: a transceiver unit for receiving The sixth information sent by the first IAB node, where the sixth information is used to indicate the status level of the fourth transmission path, where the sixth information is included in the donor base station distributed unit status indication message,
  • the status level of the fourth transmission path includes one of the M status levels of the fourth transmission path, the M is greater than or equal to 2, and the M is a positive integer, and the M status levels of the fourth transmission path
  • the status level is divided according to the buffer occupancy rate of the fourth transmission path;
  • the fourth transmission path is the backhaul link between the first IAB node and the parent node of the first IAB node, and/ Or the fourth transmission path is a backhaul link between the first IAB node and the child nodes of the first IAB node;
  • the processing unit is configured to reconfigure the fourth transmission path according to
  • the processing unit is specifically configured to determine the status level of the fourth transmission path according to the sixth information; the processing unit is also specifically configured to determine the status of the fourth transmission path according to the The status level of the fourth transmission path is reconfigured with the uplink and downlink time slot resource allocation ratio of the fourth transmission path.
  • the processing unit is further specifically configured to reconfigure the fourth transmission path according to the uplink and downlink time slot resource allocation ratio of the fourth transmission path last time. Ratio of uplink and downlink time slot resources.
  • the M status levels of the transmission path are specified by a communication protocol; or, the M status levels of the transmission path are configured by the donor base station.
  • a device for determining transmission path congestion is provided, which is applied to a communication system including a donor base station and a first integrated access and backhaul IAB node.
  • the device includes: a transceiver unit for receiving The seventh information sent by the first IAB node, the seventh information includes the PDCP PDU SN value of the third data packet and the terminal equipment data radio bearer UE DRB, the PDCP PDU SN of the third data packet is the first The largest PDCP PDU SN among the R data packets successfully sent by the IAB node to the terminal device in sequence or the largest PDCP PDU SN among the R data packets sent by the first IAB node to the terminal device, the R is greater than 1, and The R is a positive integer; the processing unit is configured to determine the congestion condition of the fifth transmission path according to the seventh information, and the fifth transmission path is the transmission path between the first IAB node and the donor base station And/or the access link between the first IAB node and the terminal device.
  • the difference between the PDCP PDU SN value of the third data packet and the PDCP PDU SN value of the fourth data packet is greater than or equal to the first threshold, so
  • the processing unit is further specifically configured to determine that the fifth transmission path is congested, and the PDCP PDU SN value of the fourth data packet is the largest PDCP PDU SN among the K data packets sent by the donor base station to the terminal device, and K is greater than 1, and the K is a positive integer.
  • the processing unit when the fifth transmission path is congested, is further specifically configured to determine whether the buffer size expected by the UE DRB is greater than or equal to The second threshold value, when the buffer size expected by the UE DRB is greater than or equal to the second threshold value, the processing unit is specifically configured to determine the transmission path between the first IAB node and the donor base station Congestion occurs on the first backhaul link on the above, and the first backhaul link is any backhaul link on the transmission path between the first IAB node and the donor base station; the buffer expected by the UE DRB In a case where the size is lower than the second threshold value, the processing unit is specifically configured to determine that the access link between the first IAB node and the terminal device is congested.
  • the first threshold is specified by a communication protocol, or the first threshold is configured by the donor base station.
  • the second threshold is specified by a communication protocol, or the second threshold is configured by the donor base station.
  • the seventh information is included in a user plane message of an F1 interface between the first IAB node and the donor base station.
  • the user plane message of the F1 interface further includes a fourth identifier, and the fourth identifier is used to indicate that the user plane message of the F1 interface includes the first Seven information.
  • a wireless backhaul link failure indication device comprising: a processing unit configured to determine wireless backhaul link failure indication information, and the wireless backhaul link failure indication information is used for To indicate that the wireless backhaul link between the second IAB node and its parent node fails or the radio resource control RRC re-establishment fails; the transceiver unit is used to send the wireless backhaul link failure indication information to the first node, so The first node is a first IAB node or a terminal device, and the second IAB node is a parent node of the first node.
  • a wireless backhaul link failure indication device comprising: a transceiver unit, configured to receive wireless backhaul link failure indication information sent by a second IAB node, the wireless backhaul
  • the link failure indication information is used to indicate that the wireless backhaul link between the second IAB node and its parent node fails or the radio resource control RRC re-establishment fails;
  • the processing unit is used to indicate the failure of the wireless backhaul link Indication information, trigger RRC re-establishment or trigger cell reselection.
  • the processing unit is specifically configured to determine that the link between the first node and the second IAB node fails Or the processing unit also specifically triggers RRC re-establishment.
  • the processing unit is further specifically configured to trigger cell reselection.
  • the device includes a transceiver, a memory, and a processor.
  • the transceiver, the memory, and the processor communicate with each other through an internal connection path
  • the memory is used to store instructions
  • the processor is used to execute the instructions stored in the memory to control the receiver to receive signals and control the transmitter to send signals
  • the processor executes the instructions stored in the memory, the processor is caused to execute the method in any one of the possible implementation manners in any of the foregoing aspects.
  • a computer program product comprising: computer program code, when the computer program code is executed by a computer, the computer is caused to execute the methods in the above aspects.
  • a computer-readable medium for storing a computer program, and the computer program includes instructions for executing the methods in the foregoing aspects.
  • a chip including: an input interface, an output interface, a processor, and a memory.
  • the input interface, output interface, the processor, and the memory are connected through an internal connection path, so
  • the processor is configured to execute the code in the memory, and when the code is executed, the processor is configured to execute the methods in the foregoing aspects.
  • Figure 1 is an architecture diagram of an IAB system suitable for the technical solution of the present application.
  • Figure 3 is a schematic diagram of a structure of an IAB node.
  • FIG. 4 is a schematic flowchart of a data transmission method 400 according to an embodiment of the present application.
  • Figure 5 is a schematic diagram of another structure of an IAB node.
  • FIG. 6 is a schematic flowchart of another data transmission method 500 provided by an embodiment of the present application.
  • Fig. 7 is a schematic diagram of another structure of an IAB node.
  • FIG. 8 is a schematic flowchart of yet another data transmission method 800 provided by an embodiment of the present application.
  • FIG. 11 is a schematic flowchart of a method 1100 for wireless backhaul link failure indication provided by an embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of an apparatus for a wireless backhaul network according to an embodiment of the present application.
  • an IAB system includes at least one base station 100, and one or more terminal devices (terminal) 101 served by the base station 100, one or more relay nodes (that is, IAB nodes) 110, and IAB One or more terminal devices 111 served by the node 110.
  • the base station 100 is called a donor next generation node B (DgNB), and the IAB node 110 is connected to the base station 100 through a wireless backhaul link 113.
  • the donor base station is also referred to as a donor node in this application, that is, a Donor node.
  • the base station 100 includes, but is not limited to: evolved node B (evolved node base, eNB), radio network controller (RNC), node B (node B, NB), base station controller (base station controller, BSC) , Base transceiver station (base transceiver station, BTS), home base station (home evolved NodeB, or home node B, HNB), baseband unit (baseband Unit, BBU), evolved (evolved LTE, eLTE) base station, NR base station (next generation node B, gNB) etc.
  • evolved node B evolved node base, eNB
  • RNC radio network controller
  • node B node B
  • base station controller base station controller
  • BSC base station controller
  • Terminal equipment includes but is not limited to: user equipment (UE), mobile station, access terminal, user unit, user station, mobile station, remote station, remote terminal, mobile equipment, terminal, wireless communication equipment, user agent, Station (ST), cell phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (wireless local loop, WLL) station in wireless local area network (wireless local access network, WLAN) Personal digital assistant (PDA), handheld devices with wireless communication functions, computing devices, other processing devices connected to wireless modems, in-vehicle devices, wearable devices, mobile stations in the future 5G network, and public Any one of terminal devices in a public land mobile network (PLMN) network.
  • PLMN public land mobile network
  • the IAB node is a specific name of a relay node, which does not constitute a limitation to the solution of this application. It can be a network type relay (such as a base station) with a forwarding function or a terminal type relay with a forwarding function, such as in a terminal device.
  • a network type relay such as a base station
  • a terminal type relay with a forwarding function, such as in a terminal device.
  • the IAB system may also include multiple other IAB nodes, for example, the IAB node 120 and the IAB node 130.
  • the IAB node 120 is connected to the IAB node 110 through a wireless backhaul link 123 to access the network.
  • the IAB node 130 is connected to the IAB node 110 through a wireless backhaul link 133 to access the network.
  • the IAB node 120 serves one or more terminal devices 121, and the IAB node 130 serves one or more terminal devices 131.
  • both the IAB node 110 and the IAB node 120 are connected to the network through a wireless backhaul link.
  • the wireless backhaul links are all viewed from the perspective of the relay node.
  • the wireless backhaul link 113 is the backhaul link of the IAB node 110
  • the wireless backhaul link 123 is the IAB node 120.
  • Backhaul link As shown in FIG. 1, an IAB node, such as 120, can be connected to another IAB node 110 through a wireless backhaul link, such as 123, to connect to the network.
  • the relay node can be connected to the network via a multi-level wireless relay node. It should be understood that the use of IAB nodes in this application is only for the purpose of description, and does not mean that the solution of this application is only used in NR scenarios. In this application, IAB nodes can generally refer to any node or device with a relay function. The use of IAB node and relay node in this application should be understood to have the same meaning.
  • wireless backhaul nodes nodes that support integrated access and backhaul are called wireless backhaul nodes.
  • the wireless backhaul node may also be called a relay node (RN), and in 5G, the wireless backhaul node may also be called an IAB node (IAB node).
  • RN relay node
  • IAB node IAB node
  • the IAB node can provide a wireless access service for the terminal device, and the data of the terminal device (which may include user plane data and control plane signaling) is connected to the host node by the IAB node through a wireless backhaul link for transmission.
  • the donor node is also referred to as an IAB donor (IAB donor) or a donor base station (donor gNodeB, DgNB).
  • IAB donor IAB donor
  • donor gNodeB donor base station
  • the DgNB may be an access network element with a complete base station function, or an access network element including a centralized unit (CU) and a distributed unit (DU) in separate forms.
  • the DgNB is connected to a core network element serving the terminal device, for example, connected to a 5G core network (5G core, 5GC), and provides a wireless backhaul function for the IAB node.
  • 5G core 5G core network
  • the centralized unit of the host node is referred to as the donor CU (donor CU), and the distributed unit of the host node is referred to as the host DU (donor DU).
  • the donor CU may also be the control plane A form in which the (control plane, CP) or user plane (UP) is separated.
  • one CU includes one CU-CP and multiple CU-UPs, which is not limited in this embodiment of the application.
  • the IAB network can support multi-hop and multi-connection networking. Therefore, there may be multiple transmission paths between the terminal device and the host node. On a certain transmission path, there are certain levels between the terminal device and the IAB node that provides wireless access services for the terminal device, between IAB nodes, and between the IAB node and the host node that provides backhaul services for the IAB node. relationship. Among them, the node that provides wireless backhaul services for the IAB node is called the parent node of the IAB node, or the node that provides wireless access services for the terminal device is called the parent node of the terminal device, and the IAB node can be regarded as the IAB node.
  • a child node of a parent node of a node the terminal device can be regarded as a child node of the parent node of the terminal device.
  • the parent node of the IAB node may be another IAB node or a host node.
  • the IAB node and the host node communicate directly through a wireless air interface, the parent node of the IAB node is the host node.
  • the wireless link used by the terminal device to communicate with the node (for example, IAB node, host node, or host DU) that provides it with wireless access services, including the access link for uplink transmission and the access for downlink transmission link.
  • the access link used for uplink transmission is also called uplink access link or access uplink, and its transmission direction is from the terminal device to the node; the access link used for downlink transmission is also called In the downlink access link or access downlink, the transmission direction is from the node to the terminal device.
  • the path consists of at least one link (link).
  • the link represents the connection between adjacent nodes.
  • the transmission path is a transmission path between the sending node and the receiving node that starts with the sending node and ends with the receiving node.
  • the transmission path between the sending node and the receiving node starting from the sending node and ending with the receiving node can be described as the transmission path between the sending node and the receiving node.
  • any node other than the host node between the terminal device and the host node can be used as the sending node, and the parent node of the sending node (for example, the parent node of the sending node or the parent node of the parent node, etc.)
  • the sending node may be a certain IAB node
  • the receiving node may be the parent node of the IAB node
  • the entire route between the IAB node and the parent node of the IAB node represents a transmission path.
  • the sending node may be a certain IAB node
  • the receiving node may be a host node, and the entire route between the IAB node and the host node represents a transmission path.
  • the sending node can be any node between the host node and the terminal device other than the terminal device, and the receiving node can be a subordinate node of the sending node (for example, a child node of the sending node or the Child nodes of child nodes, etc.).
  • the sending node may be a certain IAB node
  • the receiving node may be a child node of the IAB node, and the entire route between the IAB node and the child nodes of the IAB node represents a transmission path.
  • the sending node may be a certain IAB node
  • the receiving node may be a terminal device, and the entire route between the IAB node and the terminal device represents a transmission path.
  • backhaul link congestion includes congestion in the uplink transmission direction and congestion in the downlink transmission direction of the backhaul link. If the cache occupancy rate, load occupancy rate or cache volume of the IAB node’s uplink transmission to a parent node exceeds a certain threshold, it can be considered as the uplink transmission of the backhaul link between the IAB node and the parent node of the IAB node Congestion occurs in the direction; if the buffer occupancy rate or the amount of buffer sent to a child node in the downlink transmission of the IAB node exceeds a certain threshold, it can be considered as the backhaul chain between the IAB node and the child nodes of the IAB node Congestion occurs in the downlink transmission direction of the road, where the child node is also another IAB node.
  • the lower-level node can be regarded as a terminal device of the upper-level node.
  • an IAB node in the integrated access and backhaul system shown in FIG. 1, an IAB node is connected to an upper-level node.
  • an IAB node in the future relay system, in order to improve the reliability of the wireless backhaul link, an IAB node, such as 120, can have multiple upper-level nodes simultaneously providing services for an IAB node.
  • the IAB node 130 in Figure 1 also It may be connected to the IAB node 120 through the backhaul link 134, that is, both the IAB node 110 and the IAB node 120 are regarded as the upper node of the IAB node 130.
  • the names of the IAB nodes 110, 120, and 130 do not limit the scenarios or networks where they are deployed, and may be any other names such as relay and RN. The use of the IAB node in this application is only for the convenience of description.
  • the downlink transmission refers to an upper node, such as node 100, and a lower node, such as node 110, transmitting information or data
  • the uplink transmission refers to a lower node, such as node 110, and an upper node, such as node 100, transmitting information or data.
  • the node is not limited to whether it is a network node or a terminal device.
  • the terminal device can act as a relay node to serve other terminal devices.
  • the wireless backhaul link can be an access link in some scenarios.
  • the backhaul link 123 can also be regarded as an access link for the node 110, and the backhaul link 113 is also the access link of the node 100. link.
  • the above-mentioned upper node may be a base station or a relay node
  • the lower node may be a relay node or a terminal device with a relay function.
  • the lower node may also be a terminal device.
  • the DU function is relative to the CU function.
  • the function of the base station is divided into two parts, called CU-DU separation.
  • the CU includes the RRC layer and the PDCP layer of the LTE base station
  • the DU includes the radio link control (RLC) layer and the media access control (MAC) layer of the LTE base station.
  • RLC radio link control
  • MAC media access control
  • the physical (physical, PHY) layer In ordinary 5G base station deployment, CU and DU can be physically connected via optical fiber, and logically, there is a specially defined F1 interface for communication between CU and DU.
  • the CU is mainly responsible for radio resource control and configuration, cross-cell mobility management, and bearer management.
  • DU is mainly responsible for scheduling, physical signal generation and transmission.
  • the donor base station is a distributed unit (DU) and a centralized unit (centralized unit).
  • unit, CU unit, CU
  • DDDS downlink data delivery status
  • the DDDS feedback message includes the PDCP PDU SN value of the data packet with the largest PDCP PDU SN value of the multiple data packets successfully sent by the DU to the terminal device in sequence, but because the DDDS feedback message is based on the terminal device data radio bearer (data radio The bearer (DRB) is granular and can be fed back on the IAB node accessed by the terminal device.
  • DRB data radio The bearer
  • the IAB network there may be one-hop or multi-hop wireless transmission between the IAB node accessed by the terminal device and the CU.
  • the IAB node accessed by the terminal device sends a DDDS feedback message to the CU. It is impossible to determine whether the terminal device and the terminal device are connected.
  • the access link between the incoming IAB nodes or the backhaul link between the IAB node accessed by the terminal device and the CU is congested.
  • F1 interface application protocol F1-Application Protocol, F1-AP
  • each IAB node sends an overload message to the DU.
  • the overload The message indicates two states of the node, namely overload and non-overload.
  • the CU uses the overload message to control the access of the terminal device. However, the state of the node indicated by the overload message is limited, and the CU cannot better allocate corresponding resources for data transmission through the two states.
  • the "protocol” involved in the embodiments of the present application may refer to standard protocols in the communication field, for example, may include LTE protocol, NR protocol, and related protocols applied to future communication systems, which are not limited in this application.
  • one message may include one or more pieces of information (or signaling).
  • the interaction between the first IAB node, the second IAB node, and the donor base station is used as an example to describe the embodiments of the present application in detail.
  • Step S410 the first IAB node receives N data packets sent by the donor base station to the terminal device, where N is a positive integer, and N is greater than 1.
  • S data packets in the above N data packets may be retransmitted data packets
  • P data packets in the above N data packets may also be newly transmitted data packets
  • S and P is a positive integer, and the sum of S and P is N.
  • the first IAB node receives 6 data packets sent by the donor base station to the terminal device, among the 6 data packets, 2 data packets may be retransmitted data packets, and 4 data packets may be newly transmitted data packets; or , The 6 data packets may all be retransmitted data packets; or, the 6 data packets may all be newly transmitted data packets.
  • the first IAB node receives N data packets sent by the donor base station to the terminal device.
  • the first IAB node may receive N data packets sent by the donor base station to the terminal device from the second IAB node.
  • the second IAB node is the parent node of the first IAB node, that is, the first IAB node passes through the second IAB node.
  • the IAB node communicates with the donor base station; or, the first IAB node may also receive N data packets sent by the donor base station to the terminal device from the mobile terminal (MT) side of the first IAB node; or, the first IAB
  • the node may also send N data packets from the upper layer of the DU of the first IAB node, where the upper layer of the DU may be the upper protocol layer of the PDCP layer.
  • the first IAB node sequentially receives 5 data packets sent by the donor base station to the terminal device, and the 5 data packets are arranged in the order of PDCP PDU SN from small to large, PDCP PDU SN can The order is 1, 2, 4, 6, 7, and the first IAB node can determine the PDCP PDU SN of the first data packet as the PDCP PDU SN of the 5 data packets in ascending order and from smallest to largest PDCP PDU SN starts continuous PDCP PDU SN, the largest PDCP PDU SN, then the PDCP PDU SN of the first data packet is 2.
  • the PDCP PDU SN of the first data packet may also be the largest PDCP PDU SN of the retransmitted data packets among the N data packets or the PDCP PDU SN of the first data packet may also be the first data packet.
  • the 6 data packets are arranged in the order of PDCP PDU SN from small to large, and PDCP PDU SN can be respectively ordered Is 1, 2, 4, 5, 7, 8, and the PDCP PDU SN of these 6 data packets is 4, 5, 7, and 8 are retransmission data packets, then the first IAB node can transfer the first data
  • the PDCP PDU SN of the packet is determined to be the PDCP PDU SN of the retransmitted data packet (PDCP PDU SN is 4, 5, 7 and 8) in the 6 data packets.
  • the PDCP PDU SN is arranged in ascending order and continues from the smallest PDCP PDU SN PDCP PDU SN is the largest PDCP PDU SN, then the PDCP PDU SN of the first data packet is 5.
  • the first IAB node receives 5 data packets sent by the donor base station to the terminal device, and the PDCP PDU SN corresponding to the 5 data packets sequentially received by the first IAB node are 1, 5. 4, 6, 2, then the first IAB node can determine the PDCP PDU SN of the first data packet as the largest PDCP PDU SN of the 5 data packets, that is, the PDCP PDU SN of the first data packet is 6.
  • the user plane message of the F1 interface may be a DDDS feedback message.
  • the DDDS feedback message may also include at least one of the following: under RLC AM, the largest PDCP PDU SN successfully sent by the first IAB node to the terminal device in ascending order; under RLC UM, the first IAB node sends to the bottom layer The maximum PDCP PDU SN; the expected buffer size of the DRB for data transmission between the terminal device and the first IAB node; the expected data transmission rate of the DRB for data transmission between the terminal device and the first IAB node.
  • the foregoing first transmission path is a backhaul link between the first IAB node and the donor node.
  • the communication path between the donor base station and UE2 may be path A:
  • the first IAB node is IAB node A
  • the IAB node A directly communicates with the donor base station.
  • the above-mentioned first transmission path is the backhaul link between IAB node A and the donor base station, that is, the first transmission path may be backhaul. Link A.
  • the communication system may further include one or more second IAB nodes.
  • the case where the first transmission path is two kinds of cases is taken as an example for detailed description, and the present application is not limited to the following two cases.
  • the foregoing first transmission path is the backhaul link between the first IAB node and the second IAB node and/or the backhaul link between the second IAB node and the donor base station, where the second IAB node is the first IAB node
  • the parent node is the parent node of the second IAB node.
  • the communication path between the donor base station and UE1 may be path B, where path B is: The first IAB node is IAB node C, the second IAB node is IAB node B, IAB node B is the parent node of IAB node C, the home base station is the parent node of IAB node B, and the above-mentioned first transmission path is IAB node C and IAB
  • the backhaul link between Node Bs and/or the backhaul link between IAB Node B and the donor base station, that is, the first transmission path is backhaul link B and/or backhaul link C.
  • the aforementioned first transmission path may be the backhaul link between the first IAB node and the second IAB node #A, the backhaul link between the second IAB node #A and the second IAB node #B, and/or The backhaul link between the second IAB node #B and the donor base station.
  • the second IAB node #A is the parent node of the first IAB node
  • the second IAB node #B is the parent node of the first IAB node
  • the donor base station is the parent node of the second IAB node #B.
  • the communication path between the donor base station and UE1 may be path 2, where path 2 is:
  • the first IAB node is IAB node 3
  • the second IAB node #A is IAB node 2
  • the second IAB node #B is IAB node 1.
  • IAB node 3 communicates with the host base station via IAB node 2 and IAB node 1 in turn, IAB node 2 is the parent node of IAB node 3, IAB node 1 is the parent node of IAB node 2, and the donor base station is the parent node of IAB node 1, and the above-mentioned first transmission path is the backhaul link between IAB node 3 and IAB node 2.
  • the donor base station determines whether there is congestion or failure in the first transmission path according to the value of PDCP PDU SN of the first data packet and the value of PDCP PDU SN of the second data packet sent by the donor base station.
  • the PDCP PDU SN of the data packet is the largest PDCP PDU SN among the L data packets that the donor base station has sent, L ⁇ N, and L is a positive integer.
  • the donor base station may determine the first transmission path according to whether the difference between the value of the PDCP PDU SN of the first data packet and the value of the PDCP PDU SN of the second data packet that the donor base station has sent exceeds a preset value Whether congestion or failure occurs.
  • the donor base station determines that the first transmission path is congested or failed happening.
  • the foregoing preset value may be determined according to the number L of data packets sent by the donor base station.
  • the communication path between the donor base station and UE1 may be path B, where path B is: The first IAB node is IAB node C, the second IAB node is IAB node B, IAB node B is the parent node of IAB node C, the home base station is the parent node of IAB node B, and the above-mentioned first transmission path is IAB node C and IAB
  • the backhaul link between Node Bs and/or the backhaul link between IAB Node B and the donor base station, that is, the first transmission path is backhaul link B and/or backhaul link C.
  • the donor base station changes the path of the congested link in the first transmission path or reduces the rate of transmission data sent to the terminal device through the first transmission path, avoids or reduces the congestion on the first transmission path, and improves the performance of data transmission.
  • this application also provides another data transmission method.
  • the method 500 is applied to a communication system including a donor base station and a first IAB node, where the first IAB node is a terminal device. Access node.
  • the method 500 includes steps S410 to S440 and S510 to step S520, as shown in FIG. 6. The steps are described in detail below.
  • step S410 to step S430 please refer to the description in the method 400, which will not be described in detail here.
  • step S510 is performed.
  • the first IAB node receives third information from the second IAB node, and the third information is used to indicate whether the backhaul link between the second IAB node and the donor base station is congested or failed.
  • the first IAB communicates with the donor base station via the second IAB node.
  • Case 1 The first IAB node communicates with the donor base station via a second IAB node.
  • the foregoing third information is used to indicate whether the backhaul link between the second IAB node and the donor base station is congested or failed.
  • the third information can indicate whether the backhaul link between the second IAB node and the donor base station is congested or failed in the following two ways. This application is not limited to the following two ways to achieve.
  • the third information can indicate through an identifier that the backhaul link between the second IAB node and the donor base station is congested or failed. That is, if the third information has a link identifier, it means that the link is congested or failed; if the third information does not have a link identifier, it means that the link is not congested or failed. If the third information carries the identifier of the backhaul link between the second IAB node and the donor base station, that is, the backhaul link between the second IAB node and the donor base station is congested or failed.
  • Case 2 The first IAB node communicates with the donor base station via two second IAB nodes, that is, the first IAB node communicates with the donor base station via the second IAB node #A and the second IAB node #B.
  • the second IAB node #B needs to send whether the backhaul link between the second IAB node #B and the donor base station is congested or failed to the second IAB node #A, and the second IAB node #A sends the second Whether the backhaul link between the IAB node #A and the second IAB node #B is congested or fails, and/or whether the backhaul link between the second IAB node #B and the donor base station is congested or fails to send to The first IAB node.
  • the third information can also indicate whether the backhaul link between the second IAB node #A and the second IAB node #B is congested or failed in the following two ways, and/or the second IAB node #B and the donor base station Whether the backhaul link between them is congested or failed.
  • the third information can indicate through the identifier whether the backhaul link between the second IAB node #A and the second IAB node #B is congested or failed, and/or the second IAB node #B and the donor base station Whether the backhaul link between them is congested or failed. That is, if the third information has a link identifier, it means that the link is congested or failed; if the third information does not have a link identifier, it means that the link is not congested or failed.
  • the third information carries the identifier of the backhaul link between the second IAB node #A and the second IAB node #B
  • the return link between the second IAB node #A and the second IAB node #B The transmission link is congested or failed.
  • the third information can use a mapping table to indicate whether the backhaul link between the second IAB node #A and the second IAB node #B is congested or failed, and/or the second IAB node #B and the host Whether the backhaul link between base stations is congested or failed.
  • the mapping table is a one-to-one correspondence between the above-mentioned link and whether the above-mentioned link is congested. Whether the above-mentioned link is congested is identified by 0 and 1. For example, 0 can represent that the link is not congested or failed, and 1 It can mean that the link is congested or failed.
  • the backhaul link between the second IAB node #A and the second IAB node #B corresponds to 0, that is, the backhaul link between the second IAB node #A and the second IAB node is not congested Or failure, if the backhaul link between the second IAB node #B and the donor base station corresponds to 1, that is, the backhaul link between the second IAB node #B and the donor base station is congested or fails.
  • the second information is included in the user plane message of the F1 interface between the first IAB node and the donor base station, where the user plane message of the F1 interface is equivalent between the first IAB node and the donor base station On the F1 protocol layer.
  • the user plane message of the F1 interface further includes a second identifier, and the second identifier is used to indicate whether the user plane message of the F1 interface includes the second information.
  • the second identifier may occupy 1 bit.
  • the user plane message may be a DDDS feedback message.
  • the first transmission path is a backhaul link between the first IAB node and the donor node.
  • the second information is used to indicate whether the backhaul link between the first IAB node and the host node is congested or failed.
  • the second information may indicate through an identifier whether the backhaul link between the first IAB node and the host node is congested or failed. That is, the second information has the identifier of the backhaul link between the first IAB node and the host node, that is, the backhaul link between the first IAB node and the host node is congested or failed.
  • the identifier of the backhaul link between the IAB node and the host node means that the backhaul link between the first IAB node and the host node is not congested or fails.
  • the second information may also indicate through a mapping table whether the backhaul link between the first IAB node and the host node is congested or failed.
  • the mapping table is a one-to-one correspondence between whether the backhaul link between the first IAB node and the host node and the backhaul link between the first IAB node and the host node are congested, where the first IAB node and the host node Whether the backhaul link between nodes is congested is identified by 0 and 1.
  • 0 can represent that there is no congestion or failure in the backhaul link between the first IAB node and the host node
  • 1 can represent the first IAB node
  • the backhaul link with the host node is congested or failed.
  • the backhaul link between the first IAB node and the host node corresponds to 1, that is, the backhaul link between the first IAB node and the host node is congested or failed.
  • the first IAB node needs to merge the third information with the parent node of the first IAB node and the first IAB node. Whether the backhaul link is congested or failed, and form the second information, and send it to the donor base station.
  • the donor base station determines the congested or failed link in the first transmission path according to whether the first transmission path is congested or failed indicated in the second information. In the case that there is a congested link in the first transmission path, the donor base station can reduce the rate of transmission data sent to the terminal device via the first transmission path; or, there is a congested or failed link in the first transmission path. In the case of, the donor base station changes the routing path of the sending terminal device (that is, changes the path of the congested link in the first transmission path), so that the data between the donor base station and the terminal device is not transmitted through the first transmission path.
  • the donor base station can change the path between the donor base station and IAB node A to allow the donor base station
  • the data packet sent to IAB node A is changed to be sent by the donor base station to IAB node B, that is, the data sent by the donor base station to the terminal device through path C is changed to be sent to the terminal device through path B.
  • the donor base station reduces the transmission data sent to the terminal device through the path between the donor base station and IAB node A For example, if the rate of transmission data sent by the donor base station to the terminal device through the donor base station and IAB node A is 1000 bit/s, then the donor base station can send the transmission data to the terminal device through the donor base station and IAB node A at a rate of 800bit/s.
  • the donor base station changes the path of the congested or failed link in the first transmission path, or the donor base station reduces the rate of transmission data sent to the terminal device through the congested link in the first transmission path, so as to avoid or reduce the problem on the first transmission path.
  • Congestion conditions improve the performance of data transmission.
  • the donor base station can determine whether the first transmission path is congested or failed according to the comparison between the PDCP PDU SN value of the first data packet and the PDCP PDU SN value of the second data packet. In the case of congestion or failure of the first transmission path , The donor base station determines the congested or failed link in the first transmission path according to the second information.
  • the donor base station changes the path of the congested or failed link, avoids or reduces the congestion on the first transmission path, and improves the performance of data transmission.
  • FIG. 8 is a schematic flowchart of a data transmission method 800 provided by another embodiment of the present application from the perspective of node interaction.
  • the method 800 is applied to a communication system including a donor base station, a first IAB node, and a second IAB node.
  • the first IAB node is an access node of a terminal device, and the first IAB node communicates with the donor base station via the second IAB node. Communication.
  • the method 800 may include step S810 to step S830. The steps in this method are described in detail below.
  • Step S810 The first IAB node receives fourth information from the second IAB node, where the fourth information is used to indicate whether the second transmission path is congested or failed, where the second transmission path is the second IAB node Backhaul link with the donor base station.
  • the communication system may include one or more second IAB nodes, that is, the first IAB node communicates with the donor base station via one or more second IAB nodes.
  • Case 1' The first IAB node communicates with the donor base station via a second IAB node.
  • the foregoing fourth information is used to indicate whether the backhaul link between the second IAB node and the donor base station is congested or failed.
  • the fourth information can indicate whether the backhaul link between the second IAB node and the donor base station is congested or failed in the following two ways. This application is not limited to the following two ways to achieve.
  • the fourth information can indicate the congestion or failure of the backhaul link between the second IAB node and the donor base station through the identifier, that is, the fourth information contains the identifier of the link, which means that the link is congested or Failure, the fourth message does not contain the identifier of the link, which means that the link is not congested or failed. If the fourth information carries the identifier of the backhaul link between the second IAB node and the donor base station, then the backhaul link between the second IAB node and the donor base station is congested or failed.
  • the fourth information may use a mapping table to indicate whether the backhaul link between the second IAB node and the donor base station is congested or failed.
  • the mapping table is a one-to-one correspondence between the backhaul link between the second IAB node and the donor base station and whether the backhaul link between the second IAB node and the donor base station is congested, where the second IAB node and the donor base station Whether the backhaul link between base stations is congested is identified by 0 and 1.
  • 0 can represent that the backhaul link between the second IAB node and the donor base station is not congested or failed
  • 1 can represent the second IAB node
  • the backhaul link with the donor base station is congested or failed.
  • the backhaul link between the second IAB node and the donor base station corresponds to 1, that is, the backhaul link between the second IAB node and the donor base station is congested or fails.
  • Case 2' The first IAB node communicates with the donor base station via two second IAB nodes, that is, the first IAB node communicates with the donor base station via the second IAB node #A and the second IAB node #B.
  • the fourth information carries the identifier of the backhaul link between the second IAB node #A and the second IAB node #B
  • the communication between the second IAB node #A and the second IAB node #B The backhaul link is congested or failed.
  • the fourth information can use a mapping table to indicate whether the backhaul link between the second IAB node #A and the second IAB node #B is congested or failed, and whether the second IAB node #B and the donor base station are congested. Whether the backhaul link between them is congested or failed.
  • the mapping table is a one-to-one correspondence between the above-mentioned link and whether the above-mentioned link is congested. Whether the above-mentioned link is congested is identified by 0 and 1. For example, 0 can represent that the link is not congested or failed, and 1 It can mean that the link is congested or failed.
  • the backhaul link between the second IAB node #A and the second IAB node #B corresponds to 0, that is, there is no congestion or failure in the backhaul link between the second IAB node and the donor base station.
  • the backhaul link between the second IAB node #B and the donor base station corresponds to 1, that is, the backhaul link between the second IAB node #B and the donor base station is congested or failed.
  • Step S820 The first IAB node sends fifth information to the donor base station.
  • the fifth information is used to indicate whether the third transmission path is congested or failed.
  • the third transmission path is between the first IAB node and the second IAB node. Backhaul link and second transmission path.
  • the fifth information is included in the user plane message of the F1 interface between the first IAB node and the donor base station, where the user plane message of the F1 interface is peer-to-peer between the first IAB node and the donor base station On the F1 protocol layer.
  • the user plane message of the F1 interface further includes a third identifier, and the third identifier is used to indicate that the user plane message of the F1 interface includes the fifth information.
  • the third identifier may occupy 1 bit.
  • the fifth information may also indicate whether the third transmission path is congested or failed through a mapping table.
  • the mapping table is a one-to-one correspondence between each link in the third transmission path and whether congestion occurs in each link in the third transmission path. Whether the link is congested is identified by 0 and 1, for example, 0 can It means that the link does not have congestion or failure, and 1 can indicate that the link is congested or fails.
  • the backhaul link between the first IAB node and the second IAB node in the third transmission path corresponds to 1, that is, the backhaul link between the first IAB node and the second IAB node is congested or failed.
  • the donor base station needs to change the path of the backhaul link between the first IAB node and the second IAB node.
  • the communication path between the donor base station and UE2 can be divided into path 2, path 3, where path 2 is: Path 3 is:
  • path 2 is:
  • Path 3 is:
  • the IAB node 3 may be the first IAB node
  • the IAB node 2 may be the second IAB node #A
  • the IAB node 1 may be the second IAB node #B.
  • the third transmission path includes backhaul link 1 between the donor base station and IAB node 1, backhaul link 2 between IAB node 1 and IAB node 2, and IAB node 3.
  • IAB node 3 may be the first IAB node
  • IAB node 1 may be the second IAB node.
  • the third transmission path Including the backhaul link 1 between the donor base station and the IAB node 1 and the backhaul link 4 between the IAB node 3 and the IAB node 1.
  • the donor base station can change the path between IAB node 1 and IAB node 2, and let IAB node 1 send to IAB The data packet of node 2 is changed to IAB node 1 to send to IAB node 3; or, if the fifth information indicates that the backhaul link between IAB node 1 and IAB node 2 has failed, the donor base station will pass through the IAB node The rate of transmission data sent to the terminal equipment on the path between 1 and IAB node 2.
  • the fifth information indicates that the backhaul link between IAB node 1 and IAB node 2 is congested, and at this time, the donor base station The rate of transmission data sent to the terminal device through the backhaul link between IAB node 1 and IAB node 2 is 1200 bit/s, then the donor base station can send the backhaul link between IAB node 1 and IAB node 2 The data transmission rate to the terminal equipment is reduced to 1000 bit/s.
  • FIG. 9 is a schematic flowchart of a data transmission method 900 provided by another embodiment of the present application from the perspective of node interaction.
  • the method 900 is applied to a communication system including a donor base station and a first IAB node. As shown in FIG. 9, the method 900 may include step S910 to step S930. The steps in this method are described in detail below.
  • Step S910 The first IAB node determines the status level information of the fourth transmission path.
  • the communication system may include one or more first IAB nodes, and one or more first IAB nodes need to determine the status level information of the fourth transmission path.
  • this application does not limit the number of nodes included between the first IAB node and the donor base station.
  • the first IAB node may be an IAB node directly connected to the terminal device, and the first IAB node may not be an IAB node directly connected to the terminal device.
  • This application does not limit where the first IAB node is located in the communication system.
  • the status level of the fourth transmission path includes one of the M status levels of the fourth transmission path, M is greater than or equal to 2, and M is a positive integer, and the M status levels of the fourth transmission path are based on the fourth transmission path.
  • the occupancy rate of the buffer of the transmission path is divided; the fourth transmission path is the backhaul link between the first IAB node and the parent node of the first IAB node, and/or the fourth transmission path is the first IAB node and the first IAB node A backhaul link or access link between the child nodes of an IAB node.
  • the fourth transmission path is between the first IAB node and the terminal device Access link.
  • the communication path between the donor base station and UE2 can be divided into path 1 and path 2, where path 1 is: Path 2 is:
  • IAB node 1 may be the first IAB node, and there is only one first IAB node in the communication system, then the donor base station is the parent node of IAB node 1, and the terminal device is A child node of IAB node 1, the fourth transmission path may be the backhaul link 1 between the donor base station and IAB node 1, that is, IAB node 1 needs to determine the status level information of the slew link 1; or the fourth transmission path may also be It is the access link between the terminal device and the IAB node 1, that is, the IAB node 1 needs to determine the status level information of the access link access link 2.
  • the foregoing M status levels may be specified by a communication protocol; or, the foregoing M status levels may be configured by the donor base station.
  • the status level of the transmission path may be divided according to the buffer occupancy rate of the transmission path.
  • the status level of the transmission path can be divided into 5 status levels, and the 5 status levels of the transmission path can be as shown in Table 1.
  • the first status level is that the buffer occupancy rate is 0% to 20%
  • the second The condition level is the cache occupancy rate of 20% to 40%
  • the third condition level is that the cache occupancy rate is 40% to 60%
  • the fourth condition level is that the cache occupancy rate is 60% to 80%
  • the fifth condition level is the cache occupancy rate.
  • the rate is 80% to 100%.
  • the status level of the transmission path may include the status levels of 4 transmission paths.
  • the 4 status levels of the transmission path may be as shown in Table 2.
  • the first status level is that the buffer occupancy rate is 0% to 25%.
  • the second condition level is that the cache occupancy rate is 25% to 50%
  • the third condition level is that the cache occupancy rate is 50% to 75%
  • the fourth condition level is that the cache occupancy rate is 75% to 100%.
  • the lower the buffer occupancy the higher the condition level of the transmission path, which indicates that the congestion or failure of the transmission path is more serious.
  • the ninth condition level is the load occupancy rate of 80% to 90%
  • the tenth condition level is the load occupancy rate of 90% to 100%.
  • the higher the load occupancy rate the lower the condition level of the transmission path, indicating that the congestion or failure of the transmission path is more serious.
  • Step S920 The first IAB node sends sixth information to the donor base station, where the sixth information is used to indicate the status level of the fourth transmission path.
  • the sixth information is included in the donor base station distributed unit status indication message (GNB-DUSTATUS INDICATION). Therefore, the signaling overhead can be reduced.
  • the sixth information may indicate the status level of the fourth transmission path through the correspondence between the identifier 1 and the identifier 2.
  • the identifier 1 may be the identifier of the fourth transmission path
  • the identifier 2 may be the status level of the fourth transmission path.
  • Identifier 1 can be the identifier of backhaul link 1, and the identifier is 2 the status level of the backhaul link 1, and the identifier 1 and identifier 2 are sent by IAB node 1 to the donor base station, or the identifier 1 can be the access chain
  • the identification of path 2 the identification is the state level of the access link 2, and the identification 1 and identification 2 are sent by the IAB node 1 to the donor base station.
  • Identification 1 can be the identification corresponding to backhaul link 1
  • identification 2 can be the status level of slew link 1
  • the identification 1 and identification 2 are sent by IAB node 1 to the donor base station; or identification 1 can also be backhaul The identifier corresponding to link 2.
  • the identifier 2 can be the status level of the slew link 2, and the identifier 1 and the identifier 2 are sent to the donor base station by the IAB node 2 or the IAB node 1, or the identifier 1 can also be the backhaul link 3 corresponds to the identity, identity 2 can be the status level of slew link 3, and the identity 1 and identity 2 are sent to the donor base station by IAB node 3 or IAB node 2, or identity 1 can also correspond to access link 3.
  • the identifier 2 may be the status level of the access link 3, and the identifier 1 and identifier 2 are sent by the IAB node 3 to the donor base station.
  • Step S930 The donor base station reconfigures the uplink and downlink time slot resource allocation ratio of the fourth transmission path according to the sixth information.
  • the donor base station determines the status level of the fourth transmission path according to the sixth information, and reconfigures the uplink and downlink time slot resource allocation ratio of the congested or failed link according to the status level of the fourth transmission path.
  • the donor base station may reconfigure the uplink and downlink time slot resource allocation ratio of the congested or failed link according to the uplink and downlink time slot resource allocation ratio of the last congested or failed link.
  • the donor base station can learn the buffer occupancy rate of the fourth transmission path according to the status level of the fourth transmission path, and the donor base station reconfigures the uplink and downlink time slot resource allocation ratio of the fourth transmission path according to the buffer occupancy rate of the fourth transmission path. Therefore, the donor base station can reasonably allocate the uplink and downlink time slot resources of the fourth transmission path according to the current buffer occupancy rate of the fourth transmission path, thereby improving data transmission performance.
  • the communication path between the donor base station and UE2 can be divided into path 1 and path 2, where path 1 is: Path 2 is:
  • the sixth information is used to indicate the status level of backhaul link 1, and the sixth information includes the identification of backhaul link 1 and the backhaul link
  • the donor base station reconfigures the uplink and downlink time slot resource ratio of the backhaul link 1 according to the status level of the slewing link 1 and the uplink and downlink time slot resource ratio of the last backhaul link 1. .
  • the condition level of the backhaul link 1 is 0%-20% of the buffer occupancy rate
  • the donor base station can reduce the backhaul chain based on the uplink and downlink timeslot resource allocation of the last backhaul link 1.
  • the donor base station can increase the backhaul based on the uplink and downlink time slot resource allocation ratio of the last backhaul link 1.
  • the sixth information is used to indicate the status level of the access link 3.
  • the sixth information includes the identifier of the access link 3 and the status level of the access link 3.
  • the donor base station is based on the access link 3 According to the resource allocation ratio of the uplink and downlink time slots of the last access link 3, the resource allocation ratio of the uplink and downlink time slots of the access link 3 is reconfigured.
  • the donor base station can reduce the access chain based on the resource allocation ratio of the uplink and downlink time slots of the last access link 3 The resource allocation ratio of uplink and downlink timeslots for channel 3. For another example, if the condition level of the access link 3 is 80%-100% of the buffer occupancy rate, the donor base station can increase the access based on the resource allocation of the uplink and downlink time slots of the last access link 3. Link 3 uplink and downlink time slot resource allocation ratio.
  • the sixth information includes the identifier of the backhaul link 2 and the status level of the backhaul link 2; IAB section 2 sends the host
  • the base station sends sixth information, the sixth information is used to indicate the status level of the backhaul link 2, the sixth information includes the identifier of the backhaul link 2 and the status level of the backhaul link 2, or the sixth information is used for Indicate the status level of the backhaul link 3, the sixth information includes the identifier of the backhaul link 3 and the status level of the backhaul link 3; and/or the IAB section 3 sends the sixth information to the donor base station, the sixth information Used to indicate the status level of the backhaul link 3.
  • the sixth information includes the identifier of the backhaul link 3 and the status level of the backhaul link 3, or the sixth information is used to indicate the status level of the access link 3
  • the sixth information includes the identifier of the access link 3 and the status level of the access link 3.
  • the donor base station needs to reconfigure the uplink and downlink time slot resource allocation of the backhaul link 1 according to the status level of the slew link 1 and the uplink and downlink time slot resource allocation of the previous backhaul link 1.
  • the donor base station may also need to reconfigure the uplink and downlink time slot resource ratio of the backhaul link 2 according to the condition level of the slew link 2 and the uplink and downlink time slot resource ratio of the last backhaul link 2.
  • the donor base station may also need to reconfigure the uplink and downlink time slot resource ratio of the backhaul link 3 according to the condition level of the slew link 3 and the uplink and downlink time slot resource ratio of the last backhaul link 3.
  • the donor base station may also need to reconfigure the uplink and downlink time slot resource ratio of the access link 3 according to the condition level of the access link 3 and the uplink and downlink time slot resource ratio of the last access link 3. For example, if the condition level of the backhaul link 1 is 0%-10% load occupancy, the donor base station can reduce the backhaul chain on the basis of the uplink and downlink time slot resource allocation of the last backhaul link 1.
  • FIG. 10 is a schematic flowchart of a method 1000 for determining transmission path congestion according to an embodiment of the present application, shown from the perspective of node interaction.
  • the method 1000 is applied to a communication system including a donor base station and a first IAB node. As shown in FIG. 10, the method 1000 may include step S1010 and step S1020. The steps in this method are described in detail below.
  • Step S1010 The first IAB node sends seventh information to the donor base station.
  • the seventh information includes the PDCP PDU SN value of the third data packet and the buffer expected by the terminal equipment (user equipment, UE) data radio bearer (DRB)
  • the size, the PDCP PDU SN of the third data packet is the largest PDCP PDU among the R data packets that the first IAB node successfully sends to the terminal device in sequence or the largest PDCP PDU among the R data packets that the first IAB node sends to the terminal device SN, R is greater than 1, and R is a positive integer.
  • the seventh information is included in the user plane message of the F1 interface between the first IAB node and the donor base station.
  • the user plane message of the F1 interface further includes a fourth identifier, and the fourth identifier is used to indicate that the user plane message of the F1 interface includes seventh information.
  • the user plane message of the F1 interface includes the fourth identifier and the seventh information, thereby enabling the receiving end to correctly interpret the length of the user plane message of the F1 interface, and enabling the host base station to determine whether the user plane message of the F1 interface contains the first Seven information.
  • Step S1020 The donor base station determines the congestion condition of the fifth transmission path according to the seventh information.
  • the fifth transmission path is the transmission path between the first IAB node and the donor base station and/or the access between the first IAB node and the terminal device link.
  • the transmission path between the first IAB node and the donor base station includes one or more backhaul links.
  • the transmission path between the first IAB node and the donor base station is the backhaul link between the first IAB node and the donor base station.
  • the transmission path between the first IAB node and the donor base station is the backhaul chain between the first IAB node and the second IAB node Path, the backhaul link between the second IAB node and the donor base station, and/or the backhaul link between the second IAB node.
  • the donor base station determines that the fifth transmission path is congested, and the PDCP PDU SN of the fourth data packet
  • the value is the largest PDCP PDU SN among the K data packets sent by the donor base station to the terminal device, K is greater than 1, and K is a positive integer.
  • the first threshold value may be 80.
  • the donor base station can determine that the fifth transmission path has congestion or failure.
  • the donor base station can determine that there is no congestion in the first transmission path.
  • the donor base station determines whether the buffer size expected by the UE DRB is greater than or equal to the second threshold.
  • the donor base station can determine that the first backhaul link on the transmission path between the first IAB node and the donor base station is congested, and the first time When transmitting the link, any backhaul link on the transmission path between the first IAB node and the donor base station; when the buffer size expected by the UE DRB is lower than the second threshold, the donor base station determines the first IAB The access link between the node and the terminal device is congested.
  • the donor base station may determine that the first backhaul link on the transmission path between the first IAB node and the donor base station is congested, and the first time During the transmission link, any backhaul link on the transmission path between the first IAB node and the donor base station; when the buffer size expected by the UE DRB is lower than or equal to the second threshold, the donor base station determines The access link between an IAB node and terminal equipment is congested.
  • the first threshold value is specified by the communication protocol, or the first threshold value is configured by the donor base station.
  • the second threshold value is specified by the communication protocol, or the second threshold value is configured by the donor base station.
  • FIG. 11 is a schematic flowchart of a method 1100 for wireless backhaul link failure indication provided by an embodiment of the present application from the perspective of node interaction. As shown in FIG. 11, the method 1100 may include step S1110 and step S1120. The steps in this method are described in detail below.
  • Step S1110 The second IAB node sends wireless backhaul link failure indication information to the first node.
  • the wireless backhaul link failure indication information is used to indicate that the wireless backhaul link between the second IAB node and its parent node fails or The RRC re-establishment fails, and the first node is the first IAB node or terminal device.
  • the second IAB node is the parent node of the first IAB node, and the terminal device is a terminal device served by the second IAB node.
  • the wireless backhaul link failure indication information may be carried in a downlink control information (DCI) sent by the second IAB node, and the cyclic redundancy check (CRC) of the DCI may be It is the paging radio network temporary identity (P-RNTI).
  • DCI downlink control information
  • CRC cyclic redundancy check
  • P-RNTI paging radio network temporary identity
  • 1 bit may be added to the reserved bits in the short message in the DCI for wireless backhaul link failure indication. For example, 1 in the 1 bit is used to identify the wireless backhaul link failure, and 0 indicates that the wireless backhaul link has not failed; or the 1 bit 0 indicates that the wireless backhaul link has failed, and 1 indicates that the wireless backhaul link has not failed.
  • the wireless backhaul link failure indication can also be carried in a broadcast message sent by the second IAB node, and specifically can be carried in a master information block (MIB) message sent by the second IAB node.
  • MIB master information block
  • the SIB message includes a series of SIB messages such as SIB1 and SIB2.
  • the first node performs the first operation according to the wireless backhaul link failure indication information.
  • Case A The first node is in an RRC connected state (RRC connected).
  • the first node determines that the link between the first node and the second IAB node fails or that the first node triggers the RRC re-establishment procedure based on the link indication of the link failure indication.
  • Case B The first node is in the RRC idle state (RRC idle).
  • the first node triggers cell reselection.
  • the first node can perceive the link status of the backhaul link between the second IAB node and the parent node of the second IAB node.
  • the first node can perform cell reselection or RRC re-establishment in advance to find a new parent node for access, which effectively reduces the cause The data transmission interruption time caused by the link failure of the backhaul link between the second IAB node and the parent node of the second IAB node or the RRC re-establishment failure.
  • FIG. 12 shows an apparatus 1200 for a wireless backhaul network provided by an embodiment of the present application.
  • the apparatus 1200 may be a first IAB node or a chip in the first IAB node; or, the apparatus 1200 may also be
  • the donor base station can also be a chip in the donor base station; alternatively, the device 1200 can also be a first node or a chip in the first node; or, the device 1200 can also be a second IAB node, or it can be Chip in the second IAB node.
  • the device 1200 includes: a transceiver unit 1210 and a processing unit 1220.
  • the transceiver unit 1210 is configured to receive N data packets sent by the donor base station to the terminal device, where the N is a positive integer, and the N is greater than 1.
  • the transceiver unit is also configured to send first information to the donor base station, where the first information includes the value of the PDCP PDU SN of the first data packet.
  • the processing unit 1220 can be used to perform step S420 in the method 400, and the transceiving unit 1210 can be used to perform step S410 and step S430 in the method 400 and step S520 in the method 500.
  • the apparatus 1200 is configured to execute various processes and steps corresponding to the first IAB node in the above method 800.
  • the transceiver unit 1210 is configured to receive fourth information from the second IAB node, where the fourth information is used to indicate whether a second transmission path is congested or fails, where the second transmission path is the second IAB The backhaul link between the node and the donor base station;
  • the transceiver unit 1210 is further configured to send fifth information to the donor base station, where the fifth information is used to indicate whether the third transmission path is congested or fails, and the third transmission path includes the first IAB node The backhaul link and/or the second transmission path with the second IAB node.
  • the transceiver unit 1210 can be used to execute step S810 and step S820 in the method 800.
  • the apparatus 500 is configured to execute various processes and steps corresponding to the first node in the above method 200.
  • the processing unit 1220 is configured to determine status level information of the fourth transmission path; wherein the status level of the fourth transmission path includes one of M status levels of the fourth transmission path, and the M is greater than or equal to 2 , And the M is a positive integer, the M status levels of the fourth transmission path are divided according to the buffer occupancy of the fourth transmission path; the fourth transmission path is between the first IAB node and the The backhaul link between the parent nodes of the first IAB node, and/or the fourth transmission path is the backhaul link between the first IAB node and the child nodes of the first IAB node;
  • the transceiver unit 1210 is configured to send sixth information to the donor base station, where the sixth information is used to indicate the status level of the fourth transmission path, and the sixth information is included in the status indicator of the distributed unit of the donor base station News.
  • the processing unit 1220 can be used to execute step S910 in the method 900, and the transceiving unit 1210 can be used to execute step S920 in the method 900.
  • the apparatus 1200 is configured to execute various processes and steps corresponding to the donor base station in the method 400 described above.
  • the transceiver unit 1210 is configured to send N data packets to the first IAB node, where the N data packets are data packets sent by the donor base station to the terminal device, the N is a positive integer, and the N is greater than 1;
  • the transceiver unit 1210 is further configured to receive first information sent by the first IAB node, where the first information includes the value of the serial number PDCP PDU SN of the packet data convergence protocol of the first data packet; where The PDCP PDU SN of the first data packet is the largest PDCP PDU SN of the N data packets or the PDCP PDU SN of the first data packet is the PDCP PDU SN of the N data packets in descending order Arrange and start from the smallest PDCP PDU SN, and the largest PDCP PDU SN in continuous PDCP PDU SN;
  • the processing unit 1220 is configured to determine the congestion or failure of the first transmission path according to the first information
  • the first transmission path includes the backhaul link between the first IAB node and the second IAB node and the The backhaul link between the second IAB node and the device.
  • the processing unit 1220 can be used to perform step S440 in the method 400 and step S520 in the method 500, and the transceiver unit 1210 can be used to perform step S410 and step S430 in the method 400.
  • the apparatus 1200 is configured to execute various processes and steps corresponding to the donor base station in the above method 800.
  • the transceiver unit 1210 is configured to receive fifth information sent by the first IAB node, where the fifth information is used to indicate whether a third transmission path is congested or fails, where the third transmission path includes the first The backhaul link between the IAB node and the second IAB node and/or the backhaul link between the second IAB node and the donor base station;
  • the processing unit 1220 is configured to determine a congested or failed link of the third transmission path according to the fifth information.
  • the processing unit 1220 can be used to perform step S830 in the method 800, and the transceiving unit 1310 can be used to perform step S820 in the method 800.
  • the apparatus 1200 is configured to execute various processes and steps corresponding to the donor base station in the method 900 described above.
  • the transceiver unit 1210 is configured to receive sixth information sent by the first IAB node, where the sixth information is used to indicate the status level of the fourth transmission path, wherein the sixth information is included in the donor base station
  • the status level of the fourth transmission path includes one of the M status levels of the fourth transmission path, the M is greater than or equal to 2, and the M is a positive integer, so
  • the M status levels of the fourth transmission path are divided according to the buffer occupancy rate of the fourth transmission path; the fourth transmission path is between the first IAB node and the parent node of the first IAB node And/or the fourth transmission path is a backhaul link between the first IAB node and a child node of the first IAB node;
  • the processing unit 1220 is configured to reconfigure the uplink and downlink time slot resource allocation ratio of the fourth transmission path according to the sixth information.
  • the processing unit 1220 can be used to perform step S930 in the method 900, and the transceiving unit 1210 can be used to perform step S930 in the method 900.
  • the apparatus 1200 is configured to execute various procedures and steps corresponding to the donor base station in the above method 1000.
  • the transceiver unit 1210 is configured to receive seventh information sent by the first IAB node, where the seventh information includes the PDCP PDU SN value of the third data packet and the terminal device data radio bearer UE DRB, and the PDCP PDU SN is the largest PDCP PDU SN among the R data packets successfully sent by the first IAB node to the terminal device in sequence, the R is greater than 1, and the R is a positive integer;
  • the processing unit 1220 is configured to determine the congestion condition of a fifth transmission path according to the seventh information, where the fifth transmission path is the transmission path between the first IAB node and the donor base station and/or the The access link between the first IAB node and the terminal device.
  • the processing unit 1220 can be used to perform step S1020 in the method 1000, and the transceiving unit 1310 can be used to perform step S1010 in the method 1000.
  • the apparatus 1200 is configured to execute the processes and steps corresponding to the first node in the above method 1100.
  • the transceiver unit 1210 is configured to receive wireless backhaul link failure indication information sent by a second IAB node, where the wireless backhaul link failure indication information is used to indicate wireless backhaul between the second IAB node and its parent node Link failure or radio resource control RRC re-establishment failure;
  • the processing unit 1220 is configured to trigger the RRC re-establishment or trigger the cell reselection by the first node according to the wireless backhaul link failure indication information.
  • the processing unit 1220 can be used to perform step S1120 in the method 1100, and the transceiving unit 1210 can be used to perform step S1110 in the method 1100.
  • the device 1200 is configured to execute various processes and steps corresponding to the second IAB node in the above method 1100.
  • the processing unit 1220 is configured to determine wireless backhaul link failure indication information, where the wireless backhaul link failure indication information is used to indicate that the wireless backhaul link between the second IAB node and its parent node fails or wireless Resource control RRC re-establishment failed;
  • the transceiver unit 1210 is configured to connect and send wireless backhaul link failure indication information to a first node, where the first node is a first IAB node or a terminal device, and the second IAB node is a parent node of the first node .
  • the transceiver unit 1210 may be used to execute step S1110 in the method 1100.
  • the device 1200 here is embodied in the form of a functional unit.
  • the term "unit” here can refer to application specific integrated circuit (application specific integrated circuit, ASIC), electronic circuit, processor for executing one or more software or firmware programs (such as shared processor, proprietary processor or group Processor, etc.) and memory, merge logic circuits and/or other suitable components that support the described functions.
  • ASIC application specific integrated circuit
  • the apparatus 1200 may be specifically the first IAB node in the foregoing embodiment, and the apparatus 1200 may be used to execute various processes and procedures corresponding to the first IAB node in the foregoing method embodiment.
  • the apparatus 1200 may be specifically the donor base station in the above-mentioned embodiment, and the apparatus 1200 may be used to perform various procedures and/or steps corresponding to the donor base station in the above-mentioned method embodiment; or, the apparatus 1200 may be specifically the above-mentioned
  • the apparatus 1200 may be used to execute each process and/or step corresponding to the first node in the foregoing method embodiment; or, the apparatus 1200 may be specifically the second IAB node in the foregoing embodiment, and the apparatus 1200 may be used to execute each process and/or step corresponding to the second IAB node in the foregoing method embodiment. To avoid repetition, details are not described herein again.
  • the apparatus 1200 of each of the foregoing solutions has the function of implementing the corresponding steps performed by the donor base station in the foregoing method; the functions may be implemented by hardware or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions; for example, the transceiver unit can be replaced by a transmitter and a receiver, and other units, such as a processing unit, can be replaced by a processor to execute the respective method embodiments.
  • the transceiver unit in the device 1200 may also be composed of a sending unit and a receiving unit. For performing operations related to reception, the function of the transceiver unit can be understood as a receiving operation performed by the receiving unit. For performing operations related to transmission, The function of the transceiver unit can be understood as the sending operation performed by the sending unit.
  • the device in FIG. 12 may also be a chip or a chip system, for example, a system on chip (system on chip, SoC).
  • the transceiver unit may be the transceiver circuit of the chip, which is not limited here.
  • FIG. 13 shows another apparatus 1300 for a wireless backhaul network provided by an embodiment of the present application.
  • the apparatus 1300 may be specifically the first IAB node in the foregoing embodiment, and may be used to execute the steps and/or processes corresponding to the first IAB node in the foregoing method embodiment; or, the apparatus 1300 may be specifically the foregoing
  • the donor base station in the embodiment can be used to perform the steps and/or processes corresponding to the donor base station in the above method embodiment; or, the apparatus 1300 can be specifically the first node in the above embodiment, and can be used to perform Each step and/or process corresponding to the first node in the foregoing method embodiment; or, the apparatus 1300 may be specifically the second IAB node in the foregoing embodiment, and may be used to perform the same as the second IAB node in the foregoing method embodiment. Corresponding steps and/or processes.
  • the device 1300 includes a processor 1310, a transceiver 1320, and a memory 1330.
  • the processor 1310, the transceiver 1320, and the memory 1330 communicate with each other through internal connection paths.
  • the processor 1310 can implement the functions of the processing unit 1220 in various possible implementation manners in the apparatus 1200, and the transceiver 1320 can implement various functions in the apparatus 1200.
  • the function of the transceiver unit 1210 in a possible implementation manner.
  • the memory 1330 is used to store instructions, and the processor 1310 is used to execute instructions stored in the memory 1330. In other words, the processor 1310 can call these stored instructions to implement the functions of the processing unit 1220 in the device 1200 to control the transceiver 1320 to send signals and/or receive signal.
  • the memory 1330 may include a read-only memory and a random access memory, and provide instructions and data to the processor.
  • a part of the memory may also include a non-volatile random access memory.
  • the memory can also store device type information.
  • the processor 1310 may be used to execute instructions stored in the memory, and when the processor 1310 executes the instructions stored in the memory, the processor 1310 is used to execute the steps of the above method embodiment corresponding to the first IAB node And/or process; or, the processor 1310 is configured to execute each step and/or process of the above method embodiment corresponding to the donor base station; or, the processor 1310 is configured to execute the above method corresponding to the first node Each step and/or process of the embodiment; or, the processor 1310 is configured to execute each step and/or process of the method embodiment corresponding to the second IAB node.
  • the processor 1310 of the foregoing apparatus 1300 may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), and dedicated Integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the above method can be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software units in the processor.
  • the software unit may be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory, and the processor executes the instructions in the memory and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • 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 can 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.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • 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 this 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 disk or optical disk and other media that can store program code .

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Abstract

本申请提供了一种数据传输的方法和装置。在该方法中，第一IAB节点接收宿主基站发送给终端设备的N个数据包，N为大于1的正整数；第一IAB节点从N个数据包中确定第一数据包的PDCP PDU SN，该第一数据包的PDCP PDU SN是N个数据包的PDCP PDU SN中最大的PDCP PDU SN或是N个数据包的PDCP PDU SN按照从小到大的顺序排列且从最小的PDCP PDU SN开始连续PDCP PDU SN中最大的PDCP PDU SN；第一IAB节点向宿主基站发送第一信息，第一信息包括第一数据包的PDCP PDU SN的值。通过以上技术方案，有效地提高数据的传输性能。

Description

数据传输的方法和装置
本申请要求于2019年04月30日提交中国专利局、申请号为201910363784.7、申请名称为“数据传输的方法和装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，更具体地，涉及通信领域中数据传输的方法和装置。
背景技术
无线回传网络例如接入回传一体化(integrated access and backhaul，IAB)网络包括宿主节点和无线回传节点，终端设备通过无线回传节点与宿主节点连接。IAB网络支持多跳和多连接组网，因此，在终端设备和宿主节点之间可能存在多条传输路径。在某一条传输路径上，终端设备和为该终端设备提供无线接入服务的无线回传节点之间、无线回传节点之间、无线回传节点和为该无线回传节点提供回传服务的宿主节点之间有确定的层级关系，其中，为无线回传节点提供回传服务的节点称为该无线回传节点或该终端设备的父节点，或，为终端设备提供接入服务的节点称为该终端设备的父节点，无线回传节点可视为该无线回传节点的父节点的子节点，终端设备可视为该终端设备的父节点的子节点。
在现有的第五代(5G)通信系统，例如新空口(new radio，NR)系统的用户面协议中，如果宿主基站是分布式单元(distributed unit，DU)和集中式单元(centralized unit，CU)分离状态，为了避免DU和终端设备之间的下行数据传输的拥塞而造成数据在DU处堆积导致丢包，DU需要向CU发送下行数据传输状态(downlink data deliver status，DDDS)反馈消息，该DDDS反馈消息包括DU按序成功向终端设备发送多个数据包中分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)协议数据单元(Protocol Data Unit，PDU)序列号(Sequence Number，SN)值最大的数据包的PDCP PDU SN值，但是由于该DDDS反馈消息是以终端设备数据无线承载(data radio bearer，DRB)为粒度的，且能在终端设备接入的IAB节点上进行反馈。在IAB网络中，终端设备接入的IAB节点与CU之间还可能有一跳或多跳无线传输，终端设备接入的IAB节点向CU发送DDDS反馈消息，无法确定到底是终端设备和终端设备接入的IAB节点之间的接入链路，还是终端设备接入的IAB节点与CU之间的回传链路出现拥塞。
在现有的CU与DU之间进行通信的F1接口的控制面消息F1接口应用协议(F1-Application Protocol，F1-AP)中，每个IAB节点向DU发送过载(overload)消息，该过载消息指示了节点的两种状态，即过载和未过载。CU通过该过载消息，来进行终端设备的接入控制。但是该过载消息指示的节点的状态有限，CU通过两种状态并不能较好的为数据传输分配相应的资源。
因此，需要提供一种技术，可以有效地提高数据的传输性能。
发明内容
本申请提供一种数据传输的方法和装置，可以有效地提高数据的传输性能。
第一方面，提供了一种数据传输的方法，应用于包括宿主基站、第一接入与回传一体化IAB节点的通信系统中，其中，所述第一IAB节点是终端设备的接入节点，所述方法包括：所述第一IAB节点接收所述宿主基站发送给所述终端设备的N个数据包，所述N为正整数，且所述N大于1；所述第一IAB节点，从所述N个数据包中确定第一数据包的分组数据汇聚协议的协议数据单元序列号PDCP PDU SN，所述第一数据包的PDCP PDU SN是所述N个数据包中最大的PDCP PDU SN或所述第一数据包的PDCP PDU SN是所述N个数据包的PDCP PDU SN按照从小到大的顺序排列且从最小的PDCP PDU SN开始连续PDCP PDU SN中最大的PDCP PDU SN；所述第一IAB节点向所述宿主基站发送第一信息，所述第一信息包括所述第一数据包的PDCP PDU SN的值。
第一IAB节点通过接收宿主基站发送给终端设备的N个数据包，并从N个数据包中确定出第一数据包，该第一数据包的PDCP PDU SN是N个数据包中最大的PDCP PDU SN的数据包或第一数据包的PDCP PDU SN是N个数据包的PDCP PDU SN按照从小到大的顺序排列且从最小的PDCP PDU SN开始连续PDCP PDU SN中最大的PDCP PDU SN，第一IAB节点向宿主基站发送第一IAB节点接收的第一数据包的情况，从而第一IAB节点可以将第一IAB节点接收到的数据包的情况发送给宿主基站，以便宿主基站进行相应的操作，从而有效地提高数据的传输性能。
结合第一方面，在一种可能的实现方式中，所述方法还包括：所述第一IAB节点向所述宿主基站发送第二信息，所述第二信息用于指示第一传输路径是否发生拥塞或失败；在所述第一IAB节点经由第二IAB节点与所述宿主基站通信的情况下，所述第一传输路径包括所述第一IAB节点与所述第二IAB节点之间的回传链路和所述第二IAB节点与所述宿主基站之间的回传链路。
第一IAB节点向宿主基站发送第一IAB节点与第二IAB节点之间的回传链路和第二IAB节点与宿主基站之间的回传链路是否发生拥塞或失败，以便宿主基站进行相应的操作，从而有效地提高数据的传输性能。
结合第一方面，在一种可能的实现方式中，在所述第一IAB节点直接与所述宿主基站连接的情况下，所述第一传输路径是所述第一IAB节点与宿主节点之间的回传链路。
结合第一方面，在一种可能的实现方式中，所述方法还包括：所述第一IAB节点从所述第二IAB节点接收第三信息，所述第三信息用于指示所述第二IAB节点与所述宿主基站之间的回传链路是否发生拥塞或失败。
第一IAB节点接收第二IAB节点与宿主基站之间的回传链路是否发生拥塞或失败的情况，以便后续第一IAB节点向宿主基站发送第二IAB节点与宿主基站之间的回传链路否发生拥塞或失败的情况。
结合第一方面，在一种可能的实现方式中，所述第一信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
其中，所述F1接口的用户面消息是在第一IAB节点和宿主基站之间对等的F1协议层上。
在F1接口的用户面消息中包含第一信息，从而可以减小信令的开销。
结合第一方面，在一种可能的实现方式中，所述第二信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
在F1接口的用户面消息中包含第二信息，从而可以减小信令的开销。
结合第一方面，在一种可能的实现方式中，所述F1接口的用户面消息还包括第一标识和/或第二标识，所述第一标识用于指示所述F1接口的用户面消息中包括所述第一信息，所述第二标识用于指示所述F1接口的用户面消息中包括所述第二信息。
在用户面消息中包含第一标识和/或第二标识，从而以便后续宿主基站可以正确解读该F1接口的用户面消息的长度，以及使能宿主基站确定该F1接口的用户面消息中是否包含第一信息。
第二方面，提供了一种数据传输的方法，应用于包括宿主基站、第一接入与回传一体化IAB节点的通信系统中，其中，所述第一IAB节点是终端设备的接入节点，所述方法包括：所述宿主基站向所述第一IAB节点发送N个数据包，所述N个数据包是所述宿主基站发送给所述终端设备的数据包，所述N为正整数，且所述N大于1；所述宿主基站接收所述第一IAB节点发送的第一信息，所述第一信息包括第一数据包的分组数据汇聚协议的协议数据单元序列号PDCP PDU SN的值；其中，所述第一数据包的PDCP PDU SN是所述N个数据包中最大的PDCP PDU SN或所述第一数据包的PDCP PDU SN是所述N个数据包的PDCP PDU SN按照从小到大的顺序排列且从最小的PDCP PDU SN开始连续PDCP PDU SN中最大的PDCP PDU SN；所述宿主基站根据所述第一信息，确定第一传输路径的拥塞或失败情况；在所述第一IAB节点经由第二IAB节点与所述宿主基站通信的情况下，所述第一传输路径包括所述第一IAB节点与所述第二IAB节点之间的回传链路和所述第二IAB节点与所述宿主基站之间的回传链路。
宿主基站向第一IAB节点发送N个数据包，并接收第一IAB节点发送的第一数据包的PDCP PDU SN的值，该第一数据包的PDCP PDU SN的N个数据包中最大的PDCP PDU SN或N个数据包的PDCP PDU SN按照从小到大的顺序排列且从最小的PDCP PDU SN开始连续PDCP PDU SN中最大的PDCP PDU SN，宿主基站根据第一数据包的PDCP PDU SN的值，可以确定第一传输路径的拥塞或失败情况，从而宿主基站可以根据第一IAB节点具体接收的数据包的情况，确定第一IAB节点与第二IAB节点之间的回传链路和第二IAB节点与宿主基站之间的回传链路是否发生拥塞或失败，宿主基站从而可以获知当前传输路径的拥塞或失败情况。
结合第二方面，在一种可能的实现方式中，所述方法还包括：所述宿主基站接收所述第一IAB节点发送的第二信息，所述第二信息用于指示所述第一传输路径是否发生拥塞或失败。
宿主基站接收第一IAB节点发送的第一传输路径是否发生拥塞或失败，从而以便宿主基站获知第一传输路径的拥塞或失败情况。
结合第二方面，在一种可能的实现方式中，在所述第一IAB节点直接与所述宿主基站连接的情况下，所述第一传输路径是所述第一IAB节点与宿主节点之间的回传链路。
结合第二方面，在一种可能的实现方式中，所述宿主基站根据所述第一信息，确定第一传输路径的拥塞或失败情况包括：所述宿主基站根据所述第一信息和所述第二信息，确 定所述第一传输路径的拥塞或失败情况。
结合第二方面，在一种可能的实现方式中，所述宿主基站根据所述第一信息和所述第二信息，确定所述第一传输路径的拥塞或失败情况包括：所述宿主基站根据所述第一数据包的PDCP PDU SN的值和所述宿主基站发送的第二数据包的PDCP PDU SN的值，确定所述第一传输路径的是否存在拥塞或失败情况，其中，所述第二数据包的PDCP PDU SN是所述宿主基站已发送的L个数据包中最大的PDCP PDU SN，L≥N，且L为正整数；在所述第一传输路径存在拥塞或失败的情况下，所述宿主基站根据所述第二信息，确定所述第一传输路径中拥塞或失败的链路。
宿主基站根据对比第一数据包的PDCP PDU SN的值和第二数据包的PDCP SN的值，可以确定第一传输路径是否发生拥塞或失败，在第一传输路径存在拥塞或失败的情况下，宿主基站根据第二信息，确定所述第一传输路径中拥塞或失败的链路，从而以便宿主基站后续对第一传输路径中的拥塞或失败链路进行相应的操作，提供数据传输的性能。
结合第二方面，在一种可能的实现方式中，所述方法还包括：在所述第一传输路径中存在拥塞或失败的链路的情况下，所述宿主基站对所述拥塞或失败的链路更改路径。
在第一传输路径中存在拥塞或失败的链路的情况下，宿主基站对拥塞或失败的链路更改路径，避免或减轻第一传输路径上的拥塞情况，提高数据传输的性能。
结合第二方面，在一种可能的实现方式中，所述第一信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
其中，所述F1接口的用户面消息是在第一IAB节点和宿主基站之间对等的F1协议层上。
在F1接口的用户面消息中包含第一信息，从而可以减小信令的开销。
结合第二方面，在一种可能的实现方式中，所述第二信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
在F1接口的用户面消息中包含第二信息，从而可以减小信令的开销。
结合第二方面，在一种可能的实现方式中，所述F1接口的用户面消息还包括第一标识和/或第二标识，所述第一标识用于指示所述F1接口的用户面消息中包括所述第一信息，所述第二标识用于指示所述F1接口的用户面消息中包括所述第二信息。
在用户面消息中包含第一标识和/或第二标识，从而宿主基站可以正确解读该F1接口的用户面消息的长度，以及使能宿主基站确定该F1接口的用户面消息中是否包含第二信息。
第三方面，提供了一种数据传输的方法，应用于包括宿主基站、第一接入与回传一体化IAB节点和第二IAB节点的通信系统中，其中，所述第一IAB节点是终端设备的接入节点，所述第一IAB节点经由所述第二IAB节点与所述宿主基站通信，所述方法包括：所述第一IAB节点从所述第二IAB节点接收第四信息，所述第四信息用于指示第二传输路径是否发生拥塞或失败，其中，所述第二传输路径是所述第二IAB节点与所述宿主基站之间的回传链路；所述第一IAB节点向所述宿主基站发送第五信息，所述第五信息用于指示所述第三传输路径是否发生拥塞或失败，所述第三传输路径包括所述第一IAB节点与所述第二IAB节点之间的回传链路和/或所述第二传输路径。
第一IAB节点接收第二IAB节点发送的第二IAB节点与宿主基站之间的第二传输路 径是否发生拥塞或失败情况，第一IAB节点将第一IAB节点与第二IAB节点之间的回传链路拥塞情况和第二IAB节点与宿主基站之间的回传链路拥塞情况发送给宿主基站，从而宿主基站获知第一IAB节点与第二IAB节点之间的的链路拥塞情况和第二IAB节点与宿主基站之间的回传链路拥塞情况，以便宿主基站后续对第一IAB节点与第二IAB节点之间的的链路和第二IAB节点与宿主基站之间的回传链路进行相应的措施。
结合第三方面，在一种可能的实现方式中，所述第五信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
其中，所述F1接口的用户面消息是在第一IAB节点和宿主基站之间对等的F1协议层上。
在F1接口的用户面消息中包含第五信息，从而可以减小信令的开销。
结合第三方面，在一种可能的实现方式中，所述F1接口的用户面消息还包括第三标识，所述第三标识用于指示所述F1接口的用户面消息中包括所述第五信息。
在F1接口的用户面消息中包含第三标识，从而以便后续宿主基站可以正确解读该F1接口的用户面消息的长度，以及使能宿主基站确定该F1接口的用户面消息中是否包含第五信息。
第四方面，提供了一种数据传输的方法，应用于包括宿主基站、第一接入与回传一体化IAB节点和第二IAB节点的通信系统中，其中，所述第一IAB节点是终端设备的接入节点，所述第一IAB节点经由所述第二IAB节点与所述宿主基站通信，所述方法包括：所述宿主基站接收所述第一IAB节点发送的第五信息，所述第五信息用于指示第三传输路径是否发生拥塞或失败，其中，所述第三传输路径包括所述第一IAB节点与所述第二IAB节点之间的回传链路和/或所述第二IAB节点与所述宿主基站之间的回传链路；所述宿主基站根据所述第五信息，确定所述第三传输路径的拥塞或失败的链路。
宿主基站获知第一IAB节点与第二IAB节点之间的的链路拥塞情况和第二IAB节点与宿主基站之间的回传链路拥塞情况，以便宿主基站后续对第一IAB节点与第二IAB节点之间的的链路和第二IAB节点与宿主基站之间的回传链路进行相应的措施。
结合第四方面，在一种可能的实现方式中，所述方法还包括：在所述第三传输路径中存在拥塞或失败的链路的情况下，所述宿主基站对所述拥塞或失败的链路更改路径。
在第三传输路径中存在拥塞或失败的链路的情况下，宿主基站对第三传输路径存在拥塞或失败的链路更改路径，从而可以避免或减轻第三传输路径上的拥塞情况，提高数据的传输性能。
结合第四方面，在一种可能的实现方式中，所述第五信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
其中，所述F1接口的用户面消息是在第一IAB节点和宿主基站之间对等的F1协议层上。
在F1接口的用户面消息中包含第五信息，从而可以减小信令的开销。
结合第四方面，在一种可能的实现方式中，所述F1接口的用户面消息还包括第三标识，所述第三标识用于指示所述F1接口的用户面消息中包括所述第五信息。
在用户面消息中包含第三标识，从而宿主基站可以正确解读该F1接口的用户面消息的长度，以及使能宿主基站确定该F1接口的用户面消息中是否包含第五信息。
第五方面，提供了一种数据传输的方法，应用于包括宿主基站和第一接入与回传一体化IAB节点的通信系统中，所述方法包括：第一IAB节点确定第四传输路径的状况等级信息；其中，所述第四传输路径的状况等级包括所述第四传输路径的M个状况等级中的一个，所述M大于或等于2，且所述M为正整数，所述第四传输路径的M个状况等级是根据所述第四传输路径的缓存占有率划分的；所述第四传输路径是所述第一IAB节点与所述第一IAB节点的父节点之间的回传链路，和/或所述第四传输路径是所述第一IAB节点与所述第一IAB节点的子节点之间的回传链路；所述第一IAB节点向所述宿主基站发送第六信息，所述第六信息用于指示所述第四传输路径的状况等级，所述第六信息包含在所述宿主基站分布式单元状态指示消息中。
第一IAB节点将第一IAB节点确定的第四传输路径的状况等级包含在宿主基站分布式单元状态指示消息中，发送给宿主基站，从而可以降低信令的开销，同时，以便宿主基站获知第四传输路径缓存占有率。
结合第五方面，在一种可能的实现方式中，所述传输路径的M个状况等级是通信协议规定的；或者，所述传输路径的M个状况等级是所述宿主基站配置的。
第六方面，提供了一种数据传输的方法，应用于包括宿主基站和第一接入与回传一体化IAB节点的通信系统中，所述方法包括：所述宿主基站接收所述第一IAB节点发送的第六信息，所述第六信息用于指示所述第四传输路径的状况等级，其中，所述第六信息包含在所述宿主基站分布式单元状态指示消息中，所述第四传输路径的状况等级包括所述第四传输路径的M个状况等级中的一个，所述M大于或等于2，且所述M为正整数，所述第四传输路径的M个状况等级是根据所述第四传输路径的缓存占有率划分的；所述第四传输路径是所述第一IAB节点与所述第一IAB节点的父节点之间的回传链路，和/或所述第四传输路径是所述第一IAB节点与所述第一IAB节点的子节点之间的回传链路；所述宿主基站根据所述第六信息，重配所述第四传输路径的上下行时隙资源配比。
宿主基站接收第一IAB节点发送的第六信息，第六信息指示的是第四传输路径的状况等级，宿主基站可以获知第四传输路径的缓存占有率。同时，第六信息包含在宿主基站分布式单元状态指示消息中，从而可以降低信令的开销。
结合第六方面，在一种可能的实现方式中，所述宿主基站根据所述第六信息，重配所述第四传输路径的上下行时隙资源配比包括：所述宿主基站根据所述第六信息，确定所述第四传输路径的状况等级；所述宿主基站根据所述第四传输路径的状况等级，重配所述第四传输路径的上下行时隙资源配比。
宿主基站根据第四传输路径的状况等级，可以获知第四传输路径的缓存占有率，宿主基站根据第四传输路径的缓存占有率，重配第四传输路径的上下行时隙资源配比。从而宿主基站可以根据当前第四传输路径的缓存的占有率，合理的对第四传输路径的上下行时隙资源进行分配，提高数据的传输性能。
结合第六方面，在一种可能的实现方式中，所述宿主基站根据所述第四传输路径的状况等级，重配所述第四传输路径的上下行时隙资源配比包括：所述宿主基站根据上一次所述第四传输路径的上下行时隙资源配比，重配所述第四传输路径的上下行时隙资源配比。
宿主基站可以根据上一次第四传输路径的上下行时隙资源配比，重配第四传输路径的上下行时隙资源配比，从而可以合理的对第四传输路径的上下行时隙资源进行分配，提高 数据的传输性能。
结合第六方面，在一种可能的实现方式中，所述传输路径的M个状况等级是通信协议规定的；或者，所述传输路径的M个状况等级是所述宿主基站配置的。
第七方面，提供了一种确定传输路径拥塞的方法，应用于包括宿主基站和第一接入与回传一体化IAB节点的通信系统中，所述方法包括：所述宿主基站接收所述第一IAB节点发送的第七信息，所述第七信息包括第三数据包的PDCP PDU SN值和终端设备数据无线承载UE DRB，所述第三数据包的PDCP PDU SN是所述第一IAB节点按序成功向终端设备发送的R个数据包中最大PDCP PDU SN或所述第一IAB节点向终端设备发送的R个数据包中最大的PDCP PDU SN，所述R大于1，且所述R为正整数；
所述宿主基站根据所述第七信息，确定第五传输路径的拥塞情况，所述第五传输路径为所述第一IAB节点与所述宿主基站之间的传输路径和/或所述第一IAB节点与所述终端设备之间的接入链路。
结合第七方面，在一种可能的实现方式中，所述主基站根据所述第七信息，确定第五传输路径的拥塞情况包括：在所述第三数据包的PDCP PDU SN值与第四数据包的PDCP PDU SN值的差值大于或等于第一门限值，所述宿主基站确定所述第五传输路径发生拥塞，所述第四数据包的PDCP PDU SN值为宿主基站发送向终端设备发送的K个数据包中最大的PDCP PDU SN，所述K大于1，且所述K为正整数。
结合第七方面，在一种可能的实现方式中，在所述第五传输路径发生拥塞的情况下，所述宿主基站判断所述UE DRB所期待的缓存大小是否大于或等于第二门限值，在所述UE DRB所期待的缓存大小大于或等于第二门限值的情况下，所述宿主基站可以确定所述第一IAB节点与宿主基站之间的传输路径上的第一回传链路发生拥塞，所述第一回传链路时所述第一IAB节点与宿主基站之间的传输路径上的任一回传链路；在UE DRB所期待的缓存大小低于第二门限值的情况下，所述宿主基站确定所述第一IAB节点与所述终端设备之间的接入链路发生拥塞。
结合第七方面，在一种可能的实现方式中，所述第一门限值是通信协议规定的，或者所述第一门限值是所述宿主基站配置的。
结合第七方面，在一种可能的实现方式中，所述第二门限值是通信协议规定的，或者所述第二门限值是所述宿主基站配置的。
结合第七方面，在一种可能的实现方式中，所述第七信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
结合第七方面，在一种可能的实现方式中，所述F1接口的用户面消息还包括第四标识，所述第四标识用于指示所述F1接口的用户面消息中包括所述第七信息。
第八方面，提供了一种无线回传链路失败指示的方法，所述方法包括：第二IAB节点确定无线回传链路失败指示信息，所述无线回传链路失败指示信息用于指示所述第二IAB节点与其父节点之间的无线回传链路发生失败或无线资源控制RRC重建立失败；所述第二IAB节点向第一节点发送无线回传链路失败指示信息，所述第一节点是第一IAB节点或终端设备，所述第二IAB节点是所述第一节点的父节点。
第九方面，提供了一种无线回传链路失败指示的方法，所述方法包括：第一节点接收第二IAB节点发送的无线回传链路失败指示信息，所述无线回传链路失败指示信息用于指 示所述第二IAB节点与其父节点之间的无线回传链路发生失败或无线资源控制RRC重建立失败；所述第一节点根据所述无线回传链路失败指示信息，触发RRC重建立或触发小区重选。
结合第九方面，在一种可能的实现方式中，在第一节点仅存在一个父节点的情况下，所述第一节点确定第一节点与第二IAB节点之间的链路失败或所述第一节点触发RRC重建立。
结合第九方面，在一种可能的实现方式中，所述第一节点处于RRC连接态，且所述第一节点处于RRC空闲态的情况下，第一节点触发小区重选。
通过上述无线回传链路失败指示信息，第一节点能够感知第二IAB节点与第二IAB节点的父节点之间回传链路的链路情况，在第二IAB节点与第二IAB节点的父节点之间回传链路的链路发生失败或RRC重建立失败的情况下，第一节点可以提前进行小区重选或RRC重建立，寻找新的父节点进行接入，有效的降低了因第二IAB节点与第二IAB节点的父节点之间回传链路的链路发生失败或RRC重建立失败而导致的数据传输中断时间。
第十方面，提供了一种用于无线回传网络的装置，所述无线回传网络包括宿主基站、第一接入与回传一体化IAB节点，所述装置包括：收发单元，用于接收所述宿主基站发送给所述终端设备的N个数据包，所述N为正整数，且所述N大于1；处理单元，用于从所述N个数据包中确定第一数据包的分组数据汇聚协议序列号PDCP PDU SN，所述第一数据包的PDCP PDU SN是所述N个数据包中最大的PDCP PDU SN或所述第一数据包的PDCP PDU SN是所述N个数据包的PDCP PDU SN按照从小到大的顺序排列且从最小的PDCP PDU SN开始连续PDCP PDU SN中最大的PDCP PDU SN；所述收发单元，还用于向所述宿主基站发送第一信息，所述第一信息包括所述第一数据包的PDCP PDU SN的值。
结合第十方面，在一种可能的实现方式中，所述收发单元还用于：向所述宿主基站发送第二信息，所述第二信息用于指示第一传输路径是否发生拥塞或失败；在所述装置经由第二IAB节点与所述宿主基站通信的情况下，所述第一传输路径包括所述装置与所述第二IAB节点之间的回传链路和所述第二IAB节点与所述宿主基站之间的回传链路。
结合第十方面，在一种可能的实现方式中，在所述装置直接与所述宿主基站连接的情况下，所述第一传输路径是所述第一IAB节点与宿主节点之间的回传链路。
结合第十方面，在一种可能的实现方式中，所述收发单元还用于：从所述第二IAB节点接收所述第三信息，所述第三信息用于指示所述第二IAB节点与所述宿主基站之间的回传链路是否发生拥塞或失败。
结合第十方面，在一种可能的实现方式中，所述第一信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
结合第十方面，在一种可能的实现方式中，所述第二信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
结合第十方面，在一种可能的实现方式中，所述F1接口的用户面消息还包括第一标识和/或第二标识，所述第一标识用于指示所述F1接口的用户面消息中包括所述第一信息，所述第二标识用于指示所述F1接口的用户面消息中包括所述第二信息。
第十一方面，提供了一种用于无线回传网络的装置，所述无线回传网络包括宿主基站、 第一接入与回传一体化IAB节点，所述装置包括：收发单元，用于向所述第一IAB节点发送N个数据包，所述N个数据包是所述宿主基站发送给所述终端设备的数据包，所述N为正整数，且所述N大于1；收发单元，还用于接收所述第一IAB节点发送的第一信息，所述第一信息包括第一数据包的分组数据汇聚协议序列号PDCP PDU SN的值；其中，所述第一数据包的PDCP PDU SN是所述N个数据包中最大的PDCP PDU SN或所述第一数据包的PDCP PDU SN是所述N个数据包的PDCP PDU SN按照从小到大的顺序排列且从最小的PDCP PDU SN开始连续PDCP PDU SN中最大的PDCP PDU SN；处理单元，用于根据所述第一信息，确定第一传输路径的拥塞或失败情况；在所述第一IAB节点经由第二IAB节点与所述装置通信的情况下，所述第一传输路径包括所述第一IAB节点与所述第二IAB节点之间的回传链路和所述第二IAB节点与所述装置之间的回传链路。
结合第十一方面，在一种可能的实现方式中，所述装置还包括：所述收发单元，还用于接收所述第一IAB节点发送的第二信息，所述第二信息用于指示所述第一传输路径是否发生拥塞或失败。
结合第十一方面，在一种可能的实现方式中，在所述第一IAB节点直接与所述装置连接的情况下，所述第一传输路径是所述第一IAB节点与装置之间的回传链路。
结合第十一方面，在一种可能的实现方式中，所述处理单元具体用于：根据所述第一信息和所述第二信息，确定所述第一传输路径的拥塞或失败情况。
结合第十一方面，在一种可能的实现方式中，所述处理单元还具体用于：根据所述第一数据包的PDCP PDU SN的值和所述装置发送的第二数据包的PDCP PDU SN的值，确定所述第一传输路径的是否存在拥塞或失败情况，其中，所述第二数据包的PDCP PDU SN是所述装置已发送的L个数据包中最大的PDCP PDU SN，所述L≥N，且所述L为正整数；在所述第一传输路径存在拥塞或失败的情况下，所述处理单元还具体用于：根据所述第二信息，确定所述第一传输路径中拥塞或失败的链路。
结合第十一方面，在一种可能的实现方式中，在所述第一传输路径中存在拥塞或失败的链路的情况下，所述处理单元还用于：对所述拥塞或失败的链路更改路径。
结合第十一方面，在一种可能的实现方式中，所述第一信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
结合第十一方面，在一种可能的实现方式中，所述第二信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
结合第十一方面，在一种可能的实现方式中，所述F1接口的用户面消息还包括第一标识和/或第二标识，所述第一标识用于指示所述F1接口的用户面消息中包括所述第一信息，所述第二标识用于指示所述F1接口的用户面消息中包括所述第二信息。
第十二方面，提供了一种用于无线回传网络的装置，所述无线回传网络包括宿主基站、第一接入与回传一体化IAB节点和第二IAB节点的通信系统中，其中，所述第一IAB节点是终端设备的接入节点，所述第一IAB节点经由所述第二IAB节点与所述宿主基站通信，所述装置包括：收发单元，用于从所述第二IAB节点接收第四信息，所述第四信息用于指示第二传输路径是否发生拥塞或失败，其中，所述第二传输路径是所述第二IAB节点与所述宿主基站之间的回传链路；收发单元，还用于向所述宿主基站发送第五信息，所述第五信息用于指示所述第三传输路径是否发生拥塞或失败，所述第三传输路径是所述第一 IAB节点与所述第二IAB节点之间的回传链路和所述第二传输路径。
结合第十二方面，在一种可能的实现方式中，所述第五信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
结合第十二方面，在一种可能的实现方式中，所述F1接口的用户面消息还包括第三标识，所述第三标识用于指示所述F1接口的用户面消息中包括所述第五信息。
第十三方面，提供了一种用于无线回传网络的装置，所述无线回传网络包括宿主基站、第一接入与回传一体化IAB节点和第二IAB节点的通信系统中，其中，所述第一IAB节点是终端设备的接入节点，所述第一IAB节点经由所述第二IAB节点与所述宿主基站通信，所述装置包括：收发单元，用于接收所述第一IAB节点发送的第五信息，所述第五信息用于指示第三传输路径是否发生拥塞或失败，其中，所述第三传输路径是所述第一IAB节点与所述第二IAB节点之间的回传链路和所述第二IAB节点和所述宿主基站之间的回传链路；处理单元，用于根据所述第五信息，确定所述第三传输路径的拥塞或失败的链路。
结合第十三方面，在一种可能的实现方式中，在所述第三传输路径中存在拥塞或失败的链路的情况下，所述处理模块还用于：对所述拥塞或失败的链路更改路径。
结合第十三方面，在一种可能的实现方式中，所述第五信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
结合第十三方面，在一种可能的实现方式中，所述F1接口的用户面消息还包括第三标识，所述第三标识用于指示所述F1接口的用户面消息中包括所述第五信息。
第十四方面，提供了用于无线回传网络的装置，应用于包括宿主基站和第一接入与回传一体化IAB节点的通信系统中，所述装置包括：处理单元，用于确定第四传输路径的状况等级信息；其中，所述第四传输路径的状况等级包括所述第四传输路径的M个状况等级中的一个，所述M大于或等于2，且所述M为正整数，所述第四传输路径的M个状况等级是根据所述第四传输路径的缓存占有率划分的；所述第四传输路径是所述第一IAB节点与所述第一IAB节点的父节点之间的回传链路，和/或所述第四传输路径是所述第一IAB节点与所述第一IAB节点的子节点之间的回传链路；收发单元，用于向所述宿主基站发送第六信息，所述第六信息用于指示所述第四传输路径的状况等级，所述第六信息包含在所述宿主基站分布式单元状态指示消息中。
结合第十四方面，在一种可能的实现方式中，所述传输路径的M个状况等级是通信协议规定的；或者，所述传输路径的M个状况等级是所述宿主基站配置的。
第十五方面，提供了用于无线回传网络的装置，应用于包括宿主基站和第一接入与回传一体化IAB节点的通信系统中，所述装置包括：收发单元，用于接收所述第一IAB节点发送的第六信息，所述第六信息用于指示所述第四传输路径的状况等级，其中，所述第六信息包含在所述宿主基站分布式单元状态指示消息中，所述第四传输路径的状况等级包括所述第四传输路径的M个状况等级中的一个，所述M大于或等于2，且所述M为正整数，所述第四传输路径的M个状况等级是根据所述第四传输路径的缓存占有率划分的；所述第四传输路径是所述第一IAB节点与所述第一IAB节点的父节点之间的回传链路，和/或所述第四传输路径是所述第一IAB节点与所述第一IAB节点的子节点之间的回传链路；处理单元，用于根据所述第六信息，重配所述第四传输路径的上下行时隙资源配比。
结合第十五方面，在一种可能的实现方式中，所述处理单元具体用于根据所述第六信 息，确定所述第四传输路径的状况等级；所述处理单元还具体用于根据所述第四传输路径的状况等级，重配所述第四传输路径的上下行时隙资源配比。
结合第十五方面，在一种可能的实现方式中，所述处理单元还具体用于根据上一次所述第四传输路径的上下行时隙资源配比，重配所述第四传输路径的上下行时隙资源配比。
结合第十五方面，在一种可能的实现方式中，所述传输路径的M个状况等级是通信协议规定的；或者，所述传输路径的M个状况等级是所述宿主基站配置的。
第十六方面，提供了一种确定传输路径拥塞的装置，应用于包括宿主基站和第一接入与回传一体化IAB节点的通信系统中，所述装置包括：收发单元，用于接收所述第一IAB节点发送的第七信息，所述第七信息包括第三数据包的PDCP PDU SN值和终端设备数据无线承载UE DRB，所述第三数据包的PDCP PDU SN是所述第一IAB节点按序成功向终端设备发送的R个数据包中最大PDCP PDU SN或所述第一IAB节点向终端设备发送的R个数据包中最大的PDCP PDU SN，所述R大于1，且所述R为正整数；处理单元，用于根据所述第七信息，确定第五传输路径的拥塞情况，所述第五传输路径为所述第一IAB节点与所述宿主基站之间的传输路径和/或所述第一IAB节点与所述终端设备之间的接入链路。
结合第十六方面，在一种可能的实现方式中，在所述第三数据包的PDCP PDU SN值与第四数据包的PDCP PDU SN值的差值大于或等于第一门限值，所述处理单元还具体用于确定所述第五传输路径发生拥塞，所述第四数据包的PDCP PDU SN值为宿主基站发送向终端设备发送的K个数据包中最大的PDCP PDU SN，所述K大于1，且所述K为正整数。
结合第十六方面，在一种可能的实现方式中，在所述第五传输路径发生拥塞的情况下，所述处理单元还具体用于判断所述UE DRB所期待的缓存大小是否大于或等于第二门限值，在所述UE DRB所期待的缓存大小大于或等于第二门限值的情况下，所述处理单元具体用于确定所述第一IAB节点与宿主基站之间的传输路径上的第一回传链路发生拥塞，所述第一回传链路时所述第一IAB节点与宿主基站之间的传输路径上的任一回传链路；在UE DRB所期待的缓存大小低于第二门限值的情况下，所述处理单元具体用于确定所述第一IAB节点与所述终端设备之间的接入链路发生拥塞。
结合第十六方面，在一种可能的实现方式中，所述第一门限值是通信协议规定的，或者所述第一门限值是所述宿主基站配置的。
结合第十六方面，在一种可能的实现方式中，所述第二门限值是通信协议规定的，或者所述第二门限值是所述宿主基站配置的。
结合第十六方面，在一种可能的实现方式中，所述第七信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
结合第十六方面，在一种可能的实现方式中，所述F1接口的用户面消息还包括第四标识，所述第四标识用于指示所述F1接口的用户面消息中包括所述第七信息。
第十七方面，提供了一种无线回传链路失败指示的装置，所述装置包括：处理单元，用于确定无线回传链路失败指示信息，所述无线回传链路失败指示信息用于指示所述第二IAB节点与其父节点之间的无线回传链路发生失败或无线资源控制RRC重建立失败；收发单元，用于向第一节点发送无线回传链路失败指示信息，所述第一节点是第一IAB节点 或终端设备，所述第二IAB节点是所述第一节点的父节点。
第十八方面，提供了一种无线回传链路失败指示的装置，所述装置包括：收发单元，用于接收第二IAB节点发送的无线回传链路失败指示信息，所述无线回传链路失败指示信息用于指示所述第二IAB节点与其父节点之间的无线回传链路发生失败或无线资源控制RRC重建立失败；处理单元，用于根据所述无线回传链路失败指示信息，触发RRC重建立或触发小区重选。
结合第十八方面，在一种可能的实现方式中，在所述装置仅存在一个父节点的情况下，所述处理单元具体用于确定第一节点与第二IAB节点之间的链路失败或所述所述处理单元还具体触发RRC重建立。
结合第十八方面，在一种可能的实现方式中，在所述装置处于RRC连接态，且所述装置处于RRC空闲态的情况下，所述处理单元还具体用于触发小区重选。
第十九方面，提供了另一种用于无线回传网络的装置，该装置包括：收发器、存储器和处理器。其中，该收发器、该存储器和该处理器通过内部连接通路互相通信，该存储器用于存储指令，该处理器用于执行该存储器存储的指令，以控制接收器接收信号，并控制发送器发送信号，并且当该处理器执行该存储器存储的指令时，使得该处理器执行上述任一方面中的任一种可能的实现方式中的方法。
第二十方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码被计算机运行时，使得所述计算机执行上述各方面中的方法。
第二十一方面，提供了一种计算机可读介质，用于存储计算机程序，该计算机程序包括用于执行上述各方面中的方法的指令。
第二十二方面，提供了一种芯片，包括：输入接口、输出接口、处理器和存储器，所述输入接口、输出接口、所述处理器以及所述存储器之间通过内部连接通路相连，所述处理器用于执行所述存储器中的代码，当所述代码被执行时，所述处理器用于执行上述各方面中的方法。
附图说明
图1是适用于本申请的技术方案的IAB系统的架构图。
图2是IAB系统的一个具体示例。
图3是IAB节点的一种结构示意图。
图4是本申请实施例提供的一种数据传输的方法400的示意性流程图。
图5是IAB节点的另一种结构示意图。
图6是本申请实施例提供的另一种数据传输的方法500的示意性流程图。
图7是IAB节点的又一种结构示意图。
图8是本申请实施例提供的又一种数据传输的方法800的示意性流程图。
图9是本申请实施例提供的又一种数据传输的方法900的示意性流程图。
图10是本申请实施例提供的一种确定传输路径拥塞的方法1000的示意性流程图。
图11是本申请实施例提供的一种无线回传链路失败指示的方法1100的示意性流程图。
图12是本申请实施例的用于无线回传网络的装置的示意性框图。
图13是本申请实施例的用于无线回传网络的装置的示意图结构图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请中所有节点、消息的名称仅仅是为了描述方便而设定的名称，在实际网络中的名称可能不同，不应该理解本申请限定各种节点、消息的名称。相反，任何具有和本申请中用到的节点或消息具有相同或类似功能的名称都视作本申请的方法或等效替换，都在本申请的保护范围之内，以下不再赘述。
本申请实施例提及的通信系统包括但不限于：窄带物联网(narrow band-internet of things，NB-IoT)系统、无线局域网(wireless local access network，WLAN)系统、LTE系统、下一代5G移动通信系统或者5G之后的演进通信系统。
参见图1，图1是适用于本申请的技术方案的IAB系统的架构图。如图1所示，一个IAB系统至少包括一个基站100，以及基站100所服务的一个或多个终端设备(terminal)101，一个或多个中继节点(也即，IAB节点)110，以及IAB节点110所服务的一个或多个终端设备111。通常，基站100被称为宿主基站(donor next generation node B，DgNB)，IAB节点110通过无线回传链路113连接到基站100。宿主基站在本申请中也称为宿主节点，即，Donor节点。
基站100包括但不限于：演进型节点B(evolved node base，eNB)、无线网络控制器(radio network controller，RNC)、节点B(node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(home evolved NodeB，或home node B，HNB)、基带单元(baseband Unit，BBU)、演进的(evolved LTE，eLTE)基站、NR基站(next generation node B，gNB)等。
终端设备包括但不限于：用户设备(user equipment，UE)、移动台、接入终端、用户单元、用户站、移动站、远方站、远程终端、移动设备、终端、无线通信设备、用户代理、无线局域网(wireless local access network，WLAN)中的站点(station，ST)、蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备、连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备、未来5G网络中的移动台以及未来演进的公共陆地移动网络(public land mobile network，PLMN)网络中的终端设备等中的任意一种。IAB节点是中继节点的特定的名称，不对本申请的方案构成限定，可以是一种具有转发功能的网络类型中继(例如基站)或者具有转发功能的终端类型中继，如终端设备中。
IAB系统还可以包括多个其它IAB节点，例如，IAB节点120和IAB节点130。IAB节点120是通过无线回传链路123连接到IAB节点110以接入到网络的。IAB节点130是通过无线回传链路133连接到IAB节点110以接入到网络的。IAB节点120为一个或多个终端设备121服务，IAB节点130为一个或多个终端设备131服务。图1中，IAB节点110和IAB节点120都通过无线回传链路连接到网络。在本申请中，所述无线回传链路都是从中继节点的角度来看的，例如无线回传链路113是IAB节点110的回传链路，无线回传链路123是IAB节点120的回传链路。如图1所示，一个IAB节点，如120， 可以通过无线回传链路，如123，连接另一个IAB节点110，从而连接到网络。而且，中继节点可以经过多级无线中继节点连接到网络。应理解，本申请中用IAB节点仅仅出于描述的需要，并不表示本申请的方案仅用于NR的场景，在本申请中，IAB节点可以泛指任何具有中继功能的节点或设备，本申请中的IAB节点和中继节点的使用应理解具有相同的含义。
另外，本申请中还涉及到如下基本术语或概念。
1、无线回传节点、宿主节点
本申请实施例中，将支持一体化的接入和回传的节点称为无线回传节点。在LTE通信系统中，该无线回传节点又可以称为中继节点(relay node，RN)，在5G中，无线回传节点又可以称为IAB节点(IAB node)。为便于描述，下面以IAB节点为例进行说明。
IAB节点可以为终端设备提供无线接入服务，该终端设备的数据(可以包括用户面数据和控制面信令)由IAB节点通过无线回传链路连接到宿主节点传输。
在本申请实施例中，宿主节点又称为IAB宿主(IAB donor)或者宿主基站(donor gNodeB，DgNB)。具体地，DgNB可以是一个具有完整基站功能的接入网网元，也可以是包括集中式单元(centralized unit，CU)和分布式单元(distributed unit，DU)分离形态的接入网网元。DgNB连接到为终端设备服务的核心网网元，例如，连接到5G核心网(5G core，5GC)，并为IAB节点提供无线回传功能。为便于表述，本申请实施例将宿主节点的集中式单元简称为宿主CU(donor CU)，将宿主节点的分布式单元简称为宿主DU(donor DU)，其中，donor CU还有可能是控制面(control plane，CP)或用户面(user plane，UP)分离的形态，例如，一个CU包括一个CU-CP和多个CU-UP组成，本申请实施例对此不作限定。
2、父节点、子节点
IAB网络可以支持多跳和多连接组网，因此，在终端设备和宿主节点之间可能存在多条传输路径。在某一条传输路径上，终端设备和为该终端设备提供无线接入服务的IAB节点之间、IAB节点之间、IAB节点和为该IAB节点提供回传服务的宿主节点之间有确定的层级关系。其中，为IAB节点提供无线回传服务的节点称为该IAB节点的父节点，或，为终端设备提供无线接入服务的节点称为该终端设备的父节点，该IAB节点可视为该IAB节点的父节点的子节点，该终端设备可视为该终端设备的父节点的子节点。这里，该IAB节点的父节点可以是其他IAB节点，也可以是宿主节点，当该IAB节点与宿主节点直接通过无线空口进行通信时，该IAB节点的父节点即为宿主节点。
3、接入链路
终端设备和为它提供无线接入服务的节点(例如，IAB节点、宿主节点或者宿主DU)进行通信时所使用的无线链路，包括用于上行传输的接入链路和下行传输的接入链路。用于上行传输的接入链路也被称为上行接入链路或接入上行链路，其传输方向是从该终端设备至该节点；用于下行传输的接入链路也被称为下行接入链路或接入下行链路，其传输方向是从该节点至该终端设备。
4、回传链路
回传链路是指某个IAB节点和它的父节点进行通信时所使用的无线链路，其父节点可以是一个IAB节点也可以是宿主节点，包括用于上行传输的回传链路和下行传输的回传链 路。用于上行传输的回传链路也被称为上行回传链路或回传上行链路，其传输方向是从该IAB节点至该IAB节点的父节点；用于下行传输的回传链路也被称为下行回传链路或回传下行链路，其传输方向是该IAB节点的父节点至该IAB节点。
5、传输路径
从发送节点至接收节点的全程路由，路径由至少一段链路(link)组成，在本申请实施例中，链路表示相邻节点之间的连接。也就是说，传输路径为发送节点与接收节点之间的以该发送节点为起点且以该接收节点为终点的传输路径。后续，为了描述方便，可以将发送节点与接收节点之间的以该发送节点为起点且以该接收节点为终点的传输路径描述为发送节点与接收节点之间的传输路径。
在上行传输中，可以将终端设备与宿主节点之间除宿主节点以外的任一个节点作为发送节点，将发送节点的上级节点(例如，该发送节点的父节点或该父节点的父节点等)作为接收节点。例如，发送节点可以是某个IAB节点，接收节点可以是该IAB节点的父节点，在该IAB节点与该IAB节点的父节点之间的全程路由表示一条传输路径。再例如，发送节点可以是某个IAB节点，接收节点可以是宿主节点，在该IAB节点与该宿主节点之间的全程路由表示一条传输路径。
同理，在下行传输中，发送节点可以是宿主节点与该终端设备之间除终端设备以外的任一个节点，接收节点可以是该发送节点的下级节点(例如，该发送节点的子节点或该子节点的子节点等)。例如，发送节点可以是某个IAB节点，接收节点可以是该IAB节点的子节点，在该IAB节点与该IAB节点的子节点之间的全程路由表示一条传输路径。再例如，发送节点可以是某个IAB节点，接收节点可以终端设备，在该IAB节点与该终端设备之间的全程路由表示一条传输路径。
6、回传链路拥塞或失败
对于回传链路拥塞，其包括回传链路上行传输方向上的拥塞和下行传输方向上的拥塞。若IAB节点的上行传输中发往某一父节点的缓存占用率、负载占用率或缓存量超过一定阈值，即可认为该IAB节点与该IAB节点的父节点之间的回传链路上行传输方向上的发生拥塞；若IAB节点的下行传输中发往某一子节点的缓存占用率或缓存量超过一定阈值值，即可认为该IAB节点与该IAB节点的子节点之间的回传链路下行传输方向上的发生拥塞，其中子节点也另一IAB节点。
对于回传链路失败，指的是回传链路发生无线链路失败(radio link failure，RLF)，其可由定时器T310超时或介质访问控制(media access control，MAC)层的随机接入问题指示或无线链路控制层(radio link control，RLC)层达到最大重传次数等原因引起。
通常，下级节点可以被看作是上级节点的一个终端设备。应理解，图1所示的一体化接入和回传系统中，一个IAB节点连接一个上级节点。但是在未来的中继系统中，为了提高无线回传链路的可靠性，一个IAB节点，如120，可以有多个上级节点同时为一个IAB节点提供服务，如图1中的IAB节点130还可以通过回传链路134连接到IAB节点120，即，IAB节点110和IAB节点120都视为IAB节点130的上级节点。IAB节点110，120，130的名称并不限制其所部署的场景或网络，可以是比如relay，RN等任何其他名称。本申请使用IAB节点仅是方便描述的需要。
在图1中，无线链路102，112，122，132，113，123，133，134可以是双向链路， 包括上行和下行传输链路，特别地，无线回传链路113，123，133，134可以用于上级节点为下级节点提供服务，如上级节点100为下级节点110提供无线回传服务。应理解，回传链路的上行和下行可以是分离的，即，上行链路和下行链路不是通过同一个节点进行传输的。所述下行传输是指上级节点，例如节点100，向下级节点，例如节点110，传输信息或数据，上行传输是指下级节点，例如节点110，向上级节点，例如节点100，传输信息或数据。所述节点不限于是网络节点还是终端设备，例如，在D2D场景下，终端设备可以充当中继节点为其他终端设备服务。无线回传链路在某些场景下又可以是接入链路，如回传链路123对节点110来说也可以被视作接入链路，回传链路113也是节点100的接入链路。应理解，上述上级节点可以是基站，也可以是中继节点，下级节点可以是中继节点，也可以是具有中继功能的终端设备，例如D2D场景下，下级节点也可以是终端设备。
参见图2，图2是IAB系统的一个具体示例。在图2所示的IAB系统中，包括宿主基站，IAB节点1，IAB节点2，也可以包括UE1和UE2。其中，宿主基站和IAB节点1之间的链路，以及IAB节点1和IAB节点2之间的链路为回传链路。UE1和宿主基站之间的链路，UE2和IAB节点1之间的链路为接入链路以及UE3和IAB节点2之间的链路为接入链路。
参见图3，图3是IAB节点的结构示意图。如图3所示，移动终端(mobile terminal，MT)功能被定义为类似UE的一个组件。在IAB中，MT被称为驻留在IAB节点上的功能。由于MT类似一个普通UE的功能，因此可以认为IAB节点通过MT接入到上级节点或网络。
DU功能是相对于CU功能而言的。在NR中，基站的功能被分为两部分，称为CU-DU分离。从协议栈的角度来看，CU包括了LTE基站的RRC层和PDCP层，DU包括了LTE基站的无线链路控制(radio link control，RLC)层、媒体访问控制(media access control，MAC)层和物理(physical，PHY)层。在普通的5G基站部署中，CU和DU物理上可以通过光纤连接，逻辑上存在一个专门定义的F1接口，用于CU与DU之间进行通信。从功能的角度来看，CU主要负责无线资源控制与配置，跨小区移动性管理，承载管理等。DU主要负责调度，物理信号生成与发送。
如背景技术所述，在IAB网络的数据传输中，在现有的新空口(new radio，NR)用户面协议中，如果宿主基站是分布式单元(distributed unit，DU)和集中式单元(centralized unit，CU)分离状态，为了避免DU和终端设备之间的下行数据传输的拥塞而造成数据在DU处堆积导致丢包，DU需要向CU发送下行数据传输状态(downlink data deliver status，DDDS)反馈消息，该DDDS反馈消息包括DU按序成功向终端设备发送多个数据包中PDCP PDU SN值最大的数据包的PDCP PDU SN值，但是由于该DDDS反馈消息是以终端设备数据无线承载(data radio bearer，DRB)为粒度的，且能在终端设备接入的IAB节点上进行反馈。在IAB网络中，终端设备接入的IAB节点与CU之间还可能有一跳或多跳无线传输，终端设备接入的IAB节点向CU发送DDDS反馈消息，无法确定到底是终端设备和终端设备接入的IAB节点之间的接入链路，还是终端设备接入的IAB节点与CU之间的回传链路出现拥塞。在现有的CU与DU之间进行通信的F1接口的控制面消息F1接口应用协议(F1-Application Protocol，F1-AP)中，每个IAB节点都会向DU发送过载(overload)消息，该过载消息指示了节点的两种状态，即过载和未过载。CU通过该过载 消息，来进行终端设备的接入控制。但是该过载消息指示的节点的状态有限，CU通过两种状态并不能较好的为数据传输分配相应的资源。
基于上述问题，本申请实施例提供了数据传输的方法，可以有效地提高数据的传输性能。
为了便于理解本申请实施例，在介绍本申请实施例之前，先作出以下几点说明。
第一，在本申请实施例中，“指示”可以包括直接指示和间接指示，也可以包括显式指示和隐式指示。将某一信息(如下文所述的第一指示信息)所指示的信息称为待指示信息，则具体实现过程中，对待指示信息进行指示的方式有很多种，例如但不限于，可以直接指示待指示信息，如待指示信息本身或者该待指示信息的索引等。也可以通过指示其他信息来间接指示待指示信息，其中该其他信息与待指示信息之间存在关联关系。还可以仅仅指示待指示信息的一部分，而待指示信息的其他部分则是已知的或者提前约定的。例如，还可以借助预先约定(例如协议规定)的各个信息的排列顺序来实现对特定信息的指示，从而在一定程度上降低指示开销。
第二，在下文示出的实施例中第一、第二以及各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围。例如，区分不同的指示信息等。
第三，本申请实施例中涉及的“协议”可以是指通信领域的标准协议，例如可以包括LTE协议、NR协议以及应用于未来的通信系统中的相关协议，本申请对此不做限定。
第四，本申请实施例中涉及的“多个”是指两个或两个以上。“以下一项(个)或多项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a、b和c中的至少一项(个)或多项(个)，可以表示：a，或b，或c，或a和b，或a和c，或b和c，或a、b和c，其中a，b，c可以是单个，也可以是多个。下面将结合附图详细说明本申请实施例提供的方法。
第五，本申请实施例中涉及的“传输路径发生拥塞或失败”是指传输路径中一段或多段链路发生拥塞或失败。
应理解，本申请实施例中所有节点、消息、参数的名称仅仅是本申请为描述方便而设定的名称，在实际网络中的名称可能不同，不应理解本申请限定各种节点、消息、参数的名称，相反，任何具有和本申请中用到的节点或消息或参数具有相同或类似功能的名称都视作本申请的方法或等效替换，都在本申请的保护范围之内，以下不再赘述。此外，在申请实施例中，一个消息可以包括一个或多个信息(或信令)。
在本申请实施例中，用于实现本申请实施例的方法或步骤的设备可以是设备本身，也可以是配置在设备中的芯片或处理器等能够实现本申请实施例的方法或步骤的装置，本申请实施例不限于此。例如，该设备可以是下文描述的宿主基站、第一IAB节点、第二IAB节点、该第一IAB节点的子节点或该第一IAB节点的父节点。下文所述的终端设备可以是终端设备本身，也可以是配置在终端设备内部的芯片或处理器。为了便于描述，统一采用终端设备描述。
以下，以第一IAB节点、第二IAB节点、和宿主基站之间的交互为例详细说明本申请实施例。
图4示出了本申请实施例提供的数据传输的方法400的示意性流程图。该方法400应用于包括宿主基站、第一IAB节点的通信系统中，其中，第一IAB节点是终端设备的接 入节点。如图4所示，该方法400可以包括步骤S410和步骤S440。下面详细说明方法400中的各个步骤。
步骤S410，第一IAB节点接收宿主基站发送给终端设备的N个数据包，该N为正整数，且N大于1。
其中，第一IAB节点接收宿主基站发送给终端设备的N个数据包可以理解为第一IAB节点成功接收宿主基站发送给终端设备的N个数据包，或者，第一IAB节点接收宿主基站发送给终端设备的N个数据包也可以理解为第一IAB节点能够正确读取接收的宿主基站发送给终端设备的N个数据包中每个数据包的PDCP PDU SN的值。
可选地，在RLC确认(acknowledged mode，AM)模式下，该第一IAB节点接收宿主基站发送给终端设备的N个数据包。
可选地，在RLC AM下，上述N个数据包中可以有S个数据包是重传的数据包，上述N个数据包中也可以有P个数据包是新传的数据包，S与P分别为正整数，且S与P之和为N。例如，第一IAB节点接收宿主基站发送给终端设备的6个数据包，该6个数据包中可以有2个数据包是重传的数据包，4个数据包是新传的数据包；或者，该6个数据包中也可以都是重传的数据包；或者，该6个数据包也可以都是新传的数据包。
可选地，在RLC非确认(un-acknowledge mode，UM)模式下，该第一IAB节点接收宿主基站发送给终端设备的N个数据包。
可选地，该第一IAB节点可以从第二IAB节点接收宿主基站发送给终端设备的N个数据包，第二IAB节点是上述第一IAB节点的父节点，即第一IAB节点经由第二IAB节点与宿主基站通信；或者，该第一IAB节点也可以从第一IAB节点的移动终端(mobile terminal，MT)侧接收宿主基站发送给终端设备的N个数据包；或者，该第一IAB节点也可以从第一IAB节点的DU的高层发送的N个数据包，其中该DU的高层可以是PDCP层的上层协议层。
步骤S420，第一IAB节点，从N个数据包中确定第一数据包的PDCP PDU SN，该第一数据包的PDCP PDU SN是N个数据包中最大的PDCP PDU SN或该第一数据包的PDCP PDU SN是N个数据包的PDCP PDU SN按照从小到大的顺序排列且从最小的PDCP PDU SN开始连续PDCP PDU SN中最大的PDCP PDU SN。
例如，在RLC AM模式下，该第一IAB节点接收了宿主基站发送给终端设备的4个数据包，该第一IAB节点依次接收的4个数据包对应的PDCP PDU SN可以分别为1，2，6，3，则第一IAB节点可以将第一数据包的PDCP PDU SN确定为这4个数据包中最大的PDCP PDU SN，即第一数据包的PDCP PDU SN为6。又例如，在RLC AM模式下，该第一IAB节点依次接收了宿主基站发送给终端设备的5个数据包，且这5个数据包按照PDCP PDU SN从小到大的顺序排列，PDCP PDU SN可以依次分别为1，2，4，6，7，则第一IAB节点可以将第一数据包的PDCP PDU SN确定为这5个数据包的PDCP PDU SN按照从小到大的顺序排列且从最小的PDCP PDU SN开始连续PDCP PDU SN中最大的PDCP PDU SN，则第一数据包的PDCP PDU SN为2。
可选地，在RLC AM模式下，上述第一数据包的PDCP PDU SN还可以是N个数据包中重传数据包中最大的PDCP PDU SN或第一数据包的PDCP PDU SN还可以是第一IAB节点接收的N个数据包中重传数据包中按照PDCP PDU SN从小到大的顺序排列的第 一组PDCP PDU SN连续数据包中最大的PDCP PDU SN。例如，在RLC AM模式下，该第一IAB节点接收了宿主基站发送给终端设备的4个数据包，该第一IAB节点接收的4个数据包对应的PDCP PDU SN可以分别为1，2，6，3，其中，PDCP PDU SN为1和3的是重传数据包，则第一IAB节点可以将第一个数据包的PDCP PDU SN确定为4个数据包中重传数据包(PDCP PDU SN为1和3)中最大的PDCP PDU SN，即第一数据包的PDCP PDU SN为3。又例如，在RLC AM模式下，该第一IAB节点接收了宿主基站发送给终端设备的6个数据包，这6个数据包按照PDCP PDU SN从小到大的顺序排列，PDCP PDU SN可以依次分别为1，2，4，5，7，8，且这6个数据包中PDCP PDU SN为4，5，7和8的数据包是重传数据包，则第一IAB节点可以将第一数据包的PDCP PDU SN确定为这6个数据包中重传数据包(PDCP PDU SN为4，5，7和8)的PDCP PDU SN按照从小到大的顺序排列且从最小的PDCP PDU SN开始连续PDCP PDU SN中最大的PDCP PDU SN，则第一数据包的PDCP PDU SN为5。
例如，在RLC UM模式下，该第一IAB节点接收了宿主基站发送给终端设备的5个数据包，且第一IAB节点依次接收的5个数据包对应的PDCP PDU SN分别为1，5，4，6，2，则第一IAB节点可以将第一数据包的PDCP PDU SN确定为这5个数据包中最大的PDCP PDU SN，即第一数据包的PDCP PDU SN为6。又例如，在RLC UM模式下，该第一IAB节点接收了宿主基站发送给终端设备的7个数据包，且第一IAB节点依次接收的7个数据包对应的PDCP PDU SN分别为1，5，4，6，7，则第一IAB节点可以将第一数据包的PDCP PDU SN确定为这7个数据包的PDCP PDU SN按照从小到大的顺序排列且从最小的PDCP PDU SN开始连续PDCP PDU SN中最大的PDCP PDU SN，则第一数据包的PDCP PDU SN为1。
步骤S430，第一IAB节点向宿主基站发送第一信息，该第一信息包括第一数据包的PDCP PDU SN的值。
可选地，该第一信息可以包含在第一IAB节点与宿主基站之间的F1接口的用户面消息中。其中，该F1接口的用户面消息是在第一IAB节点和宿主基站之间对等的F1协议层上。
可选地，该F1接口的用户面消息还包括第一标识，该第一标识用于指示该F1接口的用户面消息中是否包括第一信息。
可选地，该第一标识可以占用1个比特。
F1接口的用户面消息中包括第一标识和第一信息，从而使能接收端正确解读该F1接口的用户面消息的长度，以及使能宿主基站确定该F1接口的用户面消息中是否包含第一信息。
可选地，该F1接口的用户面消息可以是DDDS反馈消息。该DDDS反馈消息还可以包括以下至少一项：在RLC AM下，第一IAB节点向终端设备按照从小到大的顺序成功发送的最大PDCP PDU SN；在RLC UM下，第一IAB节点向底层发送的最大PDCP PDU SN；终端设备与第一IAB节点之间数据传输的DRB期待的缓存大小；终端设备与第一IAB节点之间数据传输的DRB期待的数据传输的速率。
步骤S440，宿主基站根据第一信息，确定第一传输路径的拥塞或失败情况，该第一传输路径是第一IAB节点和宿主基站之间的回传链路。
可选地，在第一IAB节点直接与宿主基站连接的情况下，上述第一传输路径是第一IAB节点与宿主节点之间的回传链路。例如，如图5所示，在宿主基站与UE2之间的通信路径可以为路径A：
Figure PCTCN2020087781-appb-000001
其中，第一IAB节点是IAB节点A，该IAB节点A直接与宿主基站通信，上述第一传输路径为IAB节点A与宿主基站之间的回传链路，即第一传输路径可以为回传链路A。
可选地，该通信系统还可以包括一个或多个第二IAB节点，以下，以第一传输路径为2种情况下为例，进行详细描述，本申请并不仅仅局限于以下2种情况。
情况1：在第一IAB节点经由第二IAB节点与宿主基站通信。
上述第一传输路径为第一IAB节点与第二IAB节点之间的回传链路和/或第二IAB节点与宿主基站之间的回传链路，其中第二IAB节点为第一IAB节点的父节点，宿主基站为第二IAB节点的父节点。例如，如图5所示，该通信系统中，宿主基站与UE1之间的通信路径可以是路径B，其中，路径B为：
Figure PCTCN2020087781-appb-000002
第一IAB节点是IAB节点C，第二IAB节点是IAB节点B，IAB节点B是IAB节点C的父节点，宿主基站是IAB节点B的父节点，上述第一传输路径为IAB节点C与IAB节点B之间的回传链路和/或IAB节点B与宿主基站之间的回传链路，即第一传输路径为回传链路B和/或回传链路C。
情况2：第一IAB节点依次经由第二IAB节点#A和第二个IAB节点与宿主基站通信。
上述第一传输路径可以为第一IAB节点与第二IAB节点#A之间的回传链路，第二IAB节点#A与第二IAB节点#B之间的回传链路，和/或第二IAB节点#B与宿主基站之间的回传链路。其中，第二IAB节点#A为第一IAB节点的父节点，第二IAB节点#B为第一个IAB节点的父节点，宿主基站为第二IAB节点#B的父节点。例如，如图7所示，该通信系统中，宿主基站与UE1之间的通信路径可以是路径2，其中，路径2为：
Figure PCTCN2020087781-appb-000003
Figure PCTCN2020087781-appb-000004
第一IAB节点是IAB节点3，第二IAB节点#A是IAB节点2，第二IAB节点#B是IAB节点1，IAB节点3依次经由IAB节点2和IAB节点1与宿主基站通信，IAB节点2是IAB节点3的父节点，IAB节点1是IAB节点2的父节点，宿主基站是IAB节点1的父节点，上述第一传输路径为IAB节点3与IAB节点2之间的回传链路，IAB节点2与IAB节点1之间的回传链路和/或IAB节点1与宿主基站之间的回传链路，即第一传输路径为回传链路3，回传链路2和/或回传链路1。
可选地，宿主基站根据第一数据包的PDCP PDU SN的值和宿主基站发送的第二数据包的PDCP PDU SN的值，确定第一传输路径的是否存在拥塞或失败情况，其中，第二数据包的PDCP PDU SN是宿主基站已发送的L个数据包中最大的PDCP PDU SN，L≥N，且L为正整数。
可选地，宿主基站可以根据第一数据包的PDCP PDU SN的值和宿主基站已发送的第二数据包的PDCP PDU SN的值之间的差值是否超过预设值来确定第一传输路径是否发生拥塞或失败。在第一数据包的PDCP PDU SN的值和宿主基站发送的第二数据包的PDCP PDU SN的值之间的差值超过预设值的情况下，宿主基站确定第一传输路径存在拥塞或失败情况。上述预设值可以根据宿主基站发送的数据包的个数L确定。例如，在宿主基站发送的数据包的个数为100的情况下，该预设值可以为80。例如，当第一数据包的SN的值为5，第二数据包的SN的值为100，则宿主基站可以确定第一传输路径存在拥塞或失败 情况。又例如，第一数据包的SN的值为85，第二数据包的SN的值为100，则宿主基站可以确定第一传输路径的不存在拥塞情况。
在宿主基站确定第一传输路径存在拥塞情况，则宿主基站可以降低经过第一传输路径发往终端设备的传输数据的速率；或者宿主基站更改发送终端设备的路由路径(即更改第一传输路径的路径)，使宿主基站与终端设备之间的数据不经过该第一传输路径进行传输。
例如，如图5所示，该通信系统中，宿主基站与UE1之间的通信路径可以是路径B，其中，路径B为：
Figure PCTCN2020087781-appb-000005
第一IAB节点是IAB节点C，第二IAB节点是IAB节点B，IAB节点B是IAB节点C的父节点，宿主基站是IAB节点B的父节点，上述第一传输路径为IAB节点C与IAB节点B之间的回传链路和/或IAB节点B与宿主基站之间的回传链路，即第一传输路径为回传链路B和/或回传链路C。在第一传输路径存在拥塞或失败的情况下，宿主基站可以更改第一传输路径的路径，即宿主基站将用另一条宿主基站与UE1之间的传输路径的路径代替第一传输路径的路径，例如，宿主基站与UE1之间的通信路径也可以是路径C，其中，路径C为：
Figure PCTCN2020087781-appb-000006
Figure PCTCN2020087781-appb-000007
宿主基站将通过路径1发往UE1的数据改为通过路径2发往UE1；或者，在第一传输路径存在失败的情况下，宿主基站可以降低宿主基站通过第一传输路径发往UE1的数据传输速率。
宿主基站对第一传输路径中的拥塞链路更改路径或降低经过第一传输路径发往终端设备的传输数据的速率，避免或减轻第一传输路径上的拥塞情况，提高数据传输的性能。
进一步地，本申请还提供了另一种数据传输的方法，如图6所示，该方法500应用于包括宿主基站、第一IAB节点的通信系统中，其中，第一IAB节点是终端设备的接入节点。该方法500包括步骤S410至步骤S440和S510至步骤S520，如图6所示。下面详细介绍各个步骤。
步骤S410至步骤S430参见方法400中的描述，这里不再详细赘述。
在第一IAB节点与宿主基站之间存在一个或多个第二IAB节点的情况下，执行步骤S510。
可选地，步骤S510，第一IAB节点从第二IAB节点接收第三信息，第三信息用于指示第二IAB节点与宿主基站之间的回传链路是否发生拥塞或失败。
其中，第一IAB经由第二IAB节点与宿主基站通信。
可选地，第一IAB节点可以经由一个或多个第二IAB节点与宿主基站通信。在第一IAB节点经由多个第二IAB节点与宿主基站通信时，当前第二IAB节点需要逐级向下一个第二IAB节点发送当前第二IAB节点与当前第二IAB节点的父节点之间的回传链路是否发生拥塞或失败。
以下，以步骤S440中所述的情况1和情况2为例，进行详细描述。
情况1：第一IAB节点经由一个第二IAB节点与宿主基站通信。
上述第三信息用于指示第二IAB节点与宿主基站之间的回传链路是否发生拥塞或失败。
第三信息可以通过如下两种方式来指示第二IAB节点与宿主基站之间的回传链路是否发生拥塞或失败。本申请并不仅仅局限于以下两种方式来实现。
方式1：该第三信息可以通过标识来指示第二IAB节点与宿主基站之间的回传链路发 生拥塞或失败。即若第三信息有链路的标识，则表示该链路发生拥塞或失败；若第三信息没有链路的标识，则表示该链路未发生拥塞或失败。若第三信息中携带有第二IAB节点与宿主基站之间的回传链路的标识，则即第二IAB节点与宿主基站之间的回传链路存在拥塞或失败。
方式2：该第三信息可以用映射表来指示第二IAB节点与宿主基站之间的回传链路是否发生拥塞或失败。该映射表是上述链路与上述链路是否发生拥塞的一一对应关系，其中，上述链路是否发生拥塞用0和1来标识，例如，0可以代表该链路不存在拥塞或失败，1可以代表该链路存在拥塞或失败。例如，第二IAB节点与宿主基站之间的回传链路对应的是1，即第二IAB节点与宿主基站之间的回传链路存在拥塞或失败。
情况2：第一IAB节点经由两个第二IAB节点与宿主基站通信，即第一IAB节点经由第二IAB节点#A和第二IAB节点#B与宿主基站通信。
上述第三信息用于指示第二IAB节点#A与第二IAB节点#B之间的回传链路是否发生拥塞或失败，和/或第二IAB节点#B与宿主基站之间的回传链路是否发生拥塞或失败。
第二IAB节点#B需要将第二IAB节点#B与宿主基站之间的回传链路是否发生拥塞或失败的情况发送给第二IAB节点#A，第二IAB节点#A再将第二IAB节点#A与第二IAB节点#B之间的回传链路是否发生拥塞或失败，和/或第二IAB节点#B与宿主基站之间的回传链路是否发生拥塞或失败发送给第一IAB节点。
第三信息也可以通过如下上述两种方式来指示第二IAB节点#A与第二IAB节点#B之间的回传链路是否发生拥塞或失败和/或第二IAB节点#B与宿主基站之间的回传链路是否发生拥塞或失败。
方式1’：该第三信息可以通过标识来指示第二IAB节点#A与第二IAB节点#B之间的回传链路是否发生拥塞或失败和/或第二IAB节点#B与宿主基站之间的回传链路是否发生拥塞或失败。即若第三信息有链路的标识，则表示该链路发生拥塞或失败；若第三信息没有链路的标识，则表示该链路未发生拥塞或失败。例如，若第三信息中携带有第二IAB节点#A与第二IAB节点#B之间的回传链路的标识，则第二IAB节点#A与第二IAB节点#B之间的回传链路存在拥塞或失败。
方式2’：该第三信息可以用映射表来指示第二IAB节点#A与第二IAB节点#B之间的回传链路是否发生拥塞或失败和/或第二IAB节点#B与宿主基站之间的回传链路是否发生拥塞或失败。该映射表是上述链路与上述链路是否发生拥塞的一一对应关系，其中，上述链路是否发生拥塞用0和1来标识，例如，0可以代表该链路不存在拥塞或失败，1可以代表该链路存在拥塞或失败。例如，第二IAB节点#A与第二IAB节点#B之间的回传链路对应的是0，即第二IAB节点#A与第二个IAB节点之间的回传链路不存在拥塞或失败，若第二IAB节点#B与宿主基站之间的回传链路对应的是1，即第二IAB节点#B与宿主基站之间的回传链路存在拥塞或失败。
步骤S520，第一IAB节点向宿主基站发送第二信息，该第二信息用于指示第一传输路径是否发生拥塞或失败。
可选地，第二信息包含在第一IAB节点与宿主基站之间的F1接口的用户面消息中，其中，该F1接口的用户面消息是在第一IAB节点和宿主基站之间对等的F1协议层上。
可选地，该F1接口的用户面消息还包括第二标识，该第二标识用于指示F1接口的用 户面消息中是否包括所述第二信息。
可选地，该第二标识可以可以占用1个比特。
可选地，该用户面消息可以是DDDS反馈消息。
可选地，在第一IAB节点直接与宿主基站连接的情况下，第一传输路径是第一IAB节点与宿主节点之间的回传链路。第二信息用于指示第一IAB节点与宿主节点之间的回传链路是否发生拥塞或失败。
可选地，该第二信息可以通过标识来指示第一IAB节点与宿主节点之间的回传链路是否发生拥塞或失败。即第二信息有第一IAB节点与宿主节点之间的回传链路的标识，即为该第一IAB节点与宿主节点之间的回传链路发生拥塞或失败，第二信息没有第一IAB节点与宿主节点之间的回传链路的标识，即为该第一IAB节点与宿主节点之间的回传链路未发生拥塞或失败。
可选地，该第二信息也可以通过映射表来指示第一IAB节点与宿主节点之间的回传链路是否发生拥塞或失败。该映射表是第一IAB节点与宿主节点之间的回传链路与第一IAB节点与宿主节点之间的回传链路是否发生拥塞的一一对应关系，其中，第一IAB节点与宿主节点之间的回传链路是否发生拥塞用0和1来标识，例如，0可以代表第一IAB节点与宿主节点之间的回传链路不存在拥塞或失败，1可以代表第一IAB节点与宿主节点之间的回传链路存在拥塞或失败。例如，第一IAB节点与宿主节点之间的回传链路对应的是1，即第一IAB节点与宿主节点之间的回传链路存在拥塞或失败。
可选地，在第一IAB节点经由一个或多个第二IAB节点与宿主基站通信的情况下，第一IAB节点需要合并第三信息和第一IAB节点与第一IAB节点的父节点之间的回传链路是否发生拥塞或失败的情况，并形成第二信息，发送给宿主基站。
步骤S440，宿主基站根据第一信息，确定第一传输路径的拥塞或失败情况。
可选地，宿主基站根据第一信息和第二信息，确定第一传输路径的拥塞或失败情况。具体地，宿主基站根据第一数据包的PDCP PDU SN的值和宿主基站发送的第二数据包的PDCP PDU SN的值，确定第一传输路径的是否存在拥塞或失败情况，其中，所述第二数据包的PDCP PDU SN是所述宿主基站已发送的L个数据包中最大的PDCP PDU SN，L≥N，且L为正整数。
在所述第一传输路径存在拥塞或失败的情况下，宿主基站根据第二信息中指示的第一传输路径是否发生拥塞或失败，确定第一传输路径中拥塞或失败的链路。在第一传输路径中存在拥塞的链路的情况下，则宿主基站可以降低经过第一传输路径发往终端设备的传输数据的速率；或者，在第一传输路径中存在拥塞或失败的链路的情况下，宿主基站更改发送终端设备的路由路径(即更改第一传输路径中拥塞链路的路径)，使宿主基站与终端设备之间的数据不经过该第一传输路径进行传输。
示例性地，若第一IAB节点与第二IAB节点之间的回传链路存在拥塞，宿主基站需要对第一IAB节点与第二IAB节点之间的回传链路更改路径。例如，如图5所示，该通信系统中，宿主基站与UE1之间的通信路径可以是路径B，其中，路径B为：
Figure PCTCN2020087781-appb-000008
Figure PCTCN2020087781-appb-000009
第一IAB节点是IAB节点C，第二IAB节点是IAB节点B，IAB节点B是IAB节点C的父节点，宿主基站是IAB节点B的父节点，上述第一传输路径为IAB节点C与IAB节点B之间的回传链路和/或IAB节点B与宿主基站之间的 回传链路，即第一传输路径为回传链路B和/或回传链路C；又例如，该通信系统中，宿主基站与UE1之间的通信路径也可以是路径C，其中，路径C为：
Figure PCTCN2020087781-appb-000010
Figure PCTCN2020087781-appb-000011
第一IAB节点是IAB节点C，第二IAB节点是IAB节点A，IAB节点A是IAB节点C的父节点，宿主基站是IAB节点A的父节点，上述第一传输路径为IAB节点C与IAB节点A之间的回传链路和/或IAB节点A与宿主基站之间的回传链路，即第一传输路径为回传链路B和/或回传链路A。若第二信息中指示的是第一传输路径中宿主基站与IAB节点A之间的回传链路发生拥塞或失败，则宿主基站可以更改宿主基站与IAB节点A之间的路径，让宿主基站发往IAB节点A的数据包，改为宿主基站向IAB节点B发送，即宿主基站通过路径C发送给终端设备的数据改为通过路径B发送给终端设备。若第二信息中指示的是第一传输路径中宿主基站与IAB节点A之间的回传链路发生拥塞，宿主基站降低经过宿主基站与IAB节点A之间的路径发往终端设备的传输数据的速率，例如，宿主基站通过宿主基站与IAB节点A发往终端设备的传输数据的速率为1000bit/s，则宿主基站可以将通过宿主基站与IAB节点A发往终端设备的传输数据的速率为800bit/s。
宿主基站对第一传输路径中的拥塞或失败链路更改路径，或者宿主基站降低经过第一传输路径中的拥塞链路发往终端设备的传输数据的速率，避免或减轻第一传输路径上的拥塞情况，提高数据传输的性能。
其中，步骤S440的详细描述可以参考上述方法400中对步骤S440中的描述，这里不再赘述。
宿主基站根据对比第一数据包的PDCP PDU SN的值和第二数据包的PDCP PDU SN的值，可以确定第一传输路径是否发生拥塞或失败，在第一传输路径存在拥塞或失败的情况下，宿主基站根据第二信息，确定所述第一传输路径中拥塞或失败的链路。
在宿主基站确定第一传输路径存在拥塞情况，则宿主基站可以降低经过第一传输路径发往终端设备的传输数据的速率；或者，在宿主基站确定第一传输路径存在拥塞或失败情况，宿主基站更改发送终端设备的路由路径(即更改第一传输路径中拥塞链路的路径)，使宿主基站与终端设备之间的数据不经过该第一传输路径进行传输。
宿主基站对拥塞或失败的链路更改路径，避免或减轻第一传输路径上的拥塞情况，提高数据传输的性能。
图8是从节点交互的角度示出的本申请另一实施例提供的数据传输方法800的示意性流程图。该方法800应用于包括宿主基站、第一IAB节点和第二IAB节点的通信系统中，其中，第一IAB节点是终端设备的接入节点，该第一IAB节点经由第二IAB节点与宿主基站通信。如图8所示，该方法800可以包括步骤S810至步骤S830。下面详细说明该方法中的各个步骤。
步骤S810，第一IAB节点从第二IAB节点接收第四信息，所述第四信息用于指示第二传输路径是否发生拥塞或失败，其中，所述第二传输路径是所述第二IAB节点与宿主基站之间的回传链路。
可选地，该通信系统可以包括一个或多个第二IAB节点，即第一IAB节点经由一个或多个第二IAB节点与宿主基站通信。
以下，以第二IAB节点的个数分别为1个和2个的情况为例，进行详细描述，本申请 对第二IAB节点的个数并不做限定。
情况1’：第一IAB节点经由一个第二IAB节点与宿主基站通信。
上述第四信息用于指示第二IAB节点与宿主基站之间的回传链路是否发生拥塞或失败。
第四信息可以通过如下两种方式来指示第二IAB节点与宿主基站之间的回传链路是否发生拥塞或失败。本申请并不仅仅局限于以下两种方式来实现。
方式A：该第四信息可以通过标识来指示第二IAB节点与宿主基站之间的回传链路发生拥塞或失败，即第四信息包含有链路的标识，则表示该链路发生拥塞或失败，第四信息没有包含链路的标识，则表示该链路未发生拥塞或失败。若第四信息中携带有第二IAB节点与宿主基站之间的回传链路的标识，则第二IAB节点与宿主基站之间的回传链路存在拥塞或失败。
方式B：该第四信息可以用映射表来指示第二IAB节点与宿主基站之间的回传链路是否发生拥塞或失败。该映射表是第二IAB节点与宿主基站之间的回传链路与第二IAB节点与宿主基站之间的回传链路是否发生拥塞的一一对应关系，其中，第二IAB节点与宿主基站之间的回传链路是否发生拥塞用0和1来标识，例如，0可以代表第二IAB节点与宿主基站之间的回传链路不存在拥塞或失败，1可以代表第二IAB节点与宿主基站之间的回传链路存在拥塞或失败。例如，第二IAB节点与宿主基站之间的回传链路对应的是1，即第二IAB节点与宿主基站之间的回传链路存在拥塞或失败。
情况2’：第一IAB节点经由两个第二IAB节点与宿主基站通信，即第一IAB节点经由第二IAB节点#A和第二IAB节点#B与宿主基站通信。
上述第四信息用于指示第二IAB节点#A与第二IAB节点#B之间的回传链路是否发生拥塞或失败，和第二IAB节点#B与宿主基站之间的回传链路是否发生拥塞或失败。
第二IAB节点#B需要将第二IAB节点#B与宿主基站之间的回传链路是否发生拥塞或失败的情况发送给第二IAB节点#A，第二IAB节点#A再将第二IAB节点#A与第二IAB节点#B之间的回传链路是否发生拥塞或失败，和第二IAB节点#B与宿主基站之间的回传链路是否发生拥塞或失败发送给第一IAB节点。
第四信息也可以通过如下上述两种方式来指示第二IAB节点#A与第二IAB节点#B之间的回传链路是否发生拥塞或失败和第二IAB节点#B与宿主基站之间的回传链路是否发生拥塞或失败。
方式A’：该第四信息可以通过标识来指示第二IAB节点#A与第二IAB节点#B之间的回传链路是否发生拥塞或失败和第二IAB节点#B与宿主基站之间的回传链路是否发生拥塞或失败，即第四信息有链路的标识，则表示该链路发生拥塞或失败，第四信息没有链路的标识，则表示该链路未发生拥塞或失败。例如，即若第四信息中携带有第二IAB节点#A与第二IAB节点#B之间的回传链路的标识，则第二IAB节点#A与第二IAB节点#B之间的回传链路存在拥塞或失败。
方式B’：该第四信息可以用映射表来指示第二IAB节点#A与第二IAB节点#B之间的回传链路是否发生拥塞或失败和第二IAB节点#B与宿主基站之间的回传链路是否发生拥塞或失败。该映射表是上述链路与上述链路是否发生拥塞的一一对应关系，其中，上述链路是否发生拥塞用0和1来标识，例如，0可以代表该链路不存在拥塞或失败，1可以 代表该链路存在拥塞或失败。例如，第二IAB节点#A与第二IAB节点#B之间的回传链路对应的是0，即第二IAB节点与宿主基站之间的回传链路不存在拥塞或失败，若第二IAB节点#B与宿主基站之间的回传链路对应的是1，即第二IAB节点#B与宿主基站之间的回传链路存在拥塞或失败。
步骤S820，第一IAB节点向宿主基站发送第五信息，该第五信息用于指示第三传输路径是否发生拥塞或失败，该第三传输路径是第一IAB节点与第二IAB节点之间的回传链路和第二传输路径。
可选地，该第五信息包含在第一IAB节点与宿主基站之间的F1接口的用户面消息中，其中，该F1接口的用户面消息是在第一IAB节点和宿主基站之间对等的F1协议层上。
可选地，该F1接口的用户面消息还包括第三标识，该第三标识用于指示F1接口的用户面消息中包括第五信息。
可选地，该第三标识可以可以占用1个比特。
可选地，该用户面消息可以是DDDS反馈消息。
可选地，宿主基站需要合并第四信息和第一IAB节点与第二IAB节点之间的回传链路是否发生拥塞或失败的情况，并形成第五信息，发送给宿主基站。
可选地，该第五信息可以通过标识来指示第三传输路径是否发生拥塞或失败。即若第五信息包含有链路的标识，即为该链路发生拥塞或失败，若第五信息没有包含该链路的标识，即为该链路未发生拥塞或失败。
可选地，该第五信息也可以通过映射表来指示第三传输路径是否发生拥塞或失败。该映射表是第三传输路径中每个链路与第三传输路径中每个链路是否发生拥塞的一一对应关系，其中，链路是否发生拥塞用0和1来标识，例如，0可以代表链路不存在拥塞或失败，1可以代表链路存在拥塞或失败。例如，第三传输路径中第一IAB节点与第二IAB节点之间的回传链路对应的是1，即第一IAB节点与第二IAB节点之间的回传链路存在拥塞或失败。
步骤S830，宿主基站根据第五信息，确定第三传输路径的拥塞或失败的链路。
在第三传输路径中存在拥塞的链路的情况下，则宿主基站可以降低经过第三传输路径发往终端设备的传输数据的速率；或者，在第三传输路径中存在拥塞或失败的链路的情况下，宿主基站更改发送终端设备的路由路径(即更改第三传输路径中拥塞链路的路径)，使宿主基站与终端设备之间的数据不经过该第三传输路径进行传输。
示例性地，若第一IAB节点与第二IAB节点之间的回传链路存在拥塞或失败，宿主基站需要对第一IAB节点与第二IAB节点之间的回传链路更改路径。例如，如图7所示，宿主基站与UE2之间的通信路径可以分为路径2、路径3，其中，路径2为：
Figure PCTCN2020087781-appb-000012
Figure PCTCN2020087781-appb-000013
路径3为：
Figure PCTCN2020087781-appb-000014
在宿主基站与UE2之间的通信路径为路径2时，IAB节点3可以是第一IAB节点，IAB节点2可以是第二IAB节点#A，IAB节点1可以是第二IAB节点#B，该通信系统中有两个第二IAB节点，第三传输路径包括宿主基站与IAB节点1之间的回传链路1，IAB节点1与IAB节点2之间的回传链路2，IAB节点3与IAB节点2之间的回传链路3。在宿主基站与UE2之间的通信路径为路径3时，IAB节点3可以是第一IAB节点，IAB节点1可以是第二IAB节点，该通信系统中有一个第二IAB节点，第三传输路径包括宿主基站 与IAB节点1之间的回传链路1和IAB节点3与IAB节点1之间的回传链路4。若第五信息指示的是IAB节点1与IAB节点2之间的回传链路发生拥塞或失败，则宿主基站可以更改IAB节点1与IAB节点2之间的路径，让IAB节点1发往IAB节点2的数据包，改为IAB节点1向IAB节点3发送；或者，若第五信息指示的是IAB节点1与IAB节点2之间的回传链路发生失败，则宿主基站降低经过IAB节点1与IAB节点2之间的路径发往终端设备的传输数据的速率，例如，第五信息指示的是IAB节点1与IAB节点2之间的回传链路发生拥塞，且此时，宿主基站经过IAB节点1与IAB节点2之间的回传链路发往终端设备的传输数据的速率为1200bit/s，则宿主基站可以将经过IAB节点1与IAB节点2之间的回传链路发往终端设备的传输数据的速率降低至1000bit/s。
通过与终端设备直接连接的第一IAB节点向宿主基站发送第一IAB节点与第二IAB节点之间的回传链路、第二IAB节点与宿主基站之间的回传链路或多个第二IAB节点之间的回传链路是否发生拥塞或失败，宿主基站对发生拥塞或失败的链路进行路径更改，避免或减轻第一IAB节点与第二IAB节点之间的回传链路、第二IAB节点与宿主基站之间的回传链路或多个第二IAB节点之间的回传链路上的拥塞情况，从而提高了数据的传输性能。
图9是从节点交互的角度示出的本申请另一实施例提供的数据传输方法900的示意性流程图。该方法900应用于包括宿主基站和第一IAB节点的通信系统中。如图9所示，该方法900可以包括步骤S910至步骤S930。下面详细说明该方法中的各个步骤。
步骤S910，第一IAB节点确定第四传输路径的状况等级信息。
可选地，该通信系统可以包括一个或多个第一IAB节点，一个或多个第一IAB节点都需要确定第四传输路径的状况等级信息。可选地，本申请对第一IAB节点与宿主基站之间包括的节点个数并不做限定。
可选地，该第一IAB节点可以是与终端设备直接连接的IAB节点，第一IAB节点也可以不是与终端设备直接连接的IAB节点。本申请对第一IAB节点具体在通信系统中的哪个位置并不做限定。
其中，该第四传输路径的状况等级包括第四传输路径的M个状况等级中的一个，M大于或等于2，且M为正整数，该第四传输路径的M个状况等级是根据第四传输路径的缓存的占有率划分的；该第四传输路径是第一IAB节点与第一IAB节点的父节点之间的回传链路，和/或第四传输路径是第一IAB节点与第一IAB节点的子节点之间的回传链路或接入链路，其中在第一IAB节点的子节点为终端设备的情况下，该第四传输路径是第一IAB节点与终端设备之间的接入链路。
例如，如图7所示，宿主基站与UE2之间的通信路径可以分为路径1和路径2，其中，路径1为：
Figure PCTCN2020087781-appb-000015
路径2为：
Figure PCTCN2020087781-appb-000016
Figure PCTCN2020087781-appb-000017
在宿主基站与UE2之间的通信路径为路径1时，IAB节点1可以是第一IAB节点，该通信系统中只有一个第一IAB节点，则宿主基站是IAB节点1的父节点，终端设备是IAB节点1的子节点，第四传输路径可以为宿主基站与IAB节点1之间的回传链路1，即IAB节点1需要确定回转链路1的状况等级信息；或者第四传输路径也可以为终端设备与IAB节点1之间的接入链路，即IAB节点1需要确定接入链路接入链路2的状况等级信息。在宿主基站与UE2之间的通信路径为路径2时，IAB节点3可以是第 一IAB节点，除此之外，该通信系统中还包括其他两个第一IAB节点，即IAB节点1和IAB节点2，其中，IAB节点3是终端设备的父节点，IAB节点2是IAB节点3的父节点，IAB节点2是IAB节点1的子节点，IAB节点1是宿主基站的子节点，第四传输路径可为宿主基站与IAB节点1之间的回传链路1、IAB节点1与IAB节点2之间的回传链路2、IAB节点2与IAB节点3之间的回传链路3和/或IAB节点3与终端设备之间的接入链路3，即IAB节点1需要确定回转链路1的状况等级信息或IAB节点1需要确定回转链路2的状况等级信息，IAB节点2需要确定回传链路2的状况等级或IAB节点2需要确定回传链路3的状况等级信息，IAB节点3需要确定回传链路2的状况等级信息或IAB节点3主要确定接入链路3的状况等级信息。
可选地，上述M个状况等级可以是通信协议规定的；或者，上述M个状况等级可以是宿主基站配置的。
可选地，该传输路径的状况等级可以根据传输路径的缓存占有率来划分。例如，该传输路径的状况等级可以被划分为5个状况等级，该传输路径的5个状况等级可以分别如表1所示，第一状况等级为缓存占有率为0％至20％，第二状况等级为缓存占有率为20％至40％，第三状况等级为缓存占有率为40％至60％，第四状况等级为缓存占有率为60％至80％，第五状况等级为缓存占有率为80％至100％。又例如，该传输路径的状况等级可以包括4个传输路径的状况等级，该传输路径的4个状况等级可以分别如表2所示，第一状况等级为缓存占有率为0％至25％，第二状况等级为缓存占有率为25％至50％，第三状况等级为缓存占有率为50％至75％，第四状况等级为缓存占有率为75％至100％。其中，缓存占有率越低，该传输路径的状况等级越高，说明该传输路径的拥塞或失败情况越严重。
表1
Figure PCTCN2020087781-appb-000018
表2
Figure PCTCN2020087781-appb-000019
可选地，该传输路径的状况等级也可以根据负载占有率来划分。例如，该传输路径的状况等级可以被划分为8个状况等级，该传输路径的8个状况等级可以分别如表3所示，第一状况等级为负载占有率为0％至12.5％，第二状况等级为负载占有率为12.5％至25％，第三状况等级为负载占有率为25％至37.5％，第四状况等级为负载占有率为37.5％至50％，第五状况等级为负载占有率为50％至62.5％，第六状况等级为负载占有率为62.5％至75％，第七状况等级为负载占有率为75％至87.5％，第八状况等级为负载占有率为87.5％至100％。又例如，该传输路径的状况等级可以包括10个传输路径的状况等级，该传输路径的10个状况等级可以分别如表4所示第一状况等级为负载占有率为0％至10％，第二状况等级为负载占有率为10％至20％，第三状况等级为负载占有率为20％至30％，第四状况等级为负载占有率为30％至40％，第五状况等级为负载占有率为40％至50％，第六状况等级为负载占有率为50％至60％，第七状况等级为负载占有率为60％至70％，第八状况 等级为负载占有率为70％至80％，第九状况等级为负载占有率为80％至90％，第十状况等级为负载占有率为90％至100％。其中，负载占有率越高，该传输路径的状况等级越低，说明该传输路径的拥塞或失败情况越严重。
表3
传输路径的状况等级 负载占有率
第一状况等级 0％－12.5％
第二状况等级 12.5％－25％
第三状况等级 25％－37.5％
第四状况等级 37.5％－50％
第五状况等级 50％－62.5％
第六状况等级 62.5％－75％
第七状况等级 75％－87.5％
第八状况等级 87.5％－100％
表4
传输路径的状况等级 负载占有率
第一状况等级 0％－10％
第二状况等级 10％－20％
第三状况等级 20％－30％
第四状况等级 30％－40％
第五状况等级 40％－50％
第六状况等级 50％－60％
第七状况等级 60％－70％
第八状况等级 70％－80％
第九状况等级 80％－90％
第十状况等级 90％－100％
步骤S920，第一IAB节点向宿主基站发送第六信息，该第六信息用于指示第四传输路径的状况等级。
可选地，第六信息包含在宿主基站分布式单元状态指示消息(GNB-DU STATUS INDICATION)中。从而可以减小信令开销。
可选地，第六信息可以通过标识1和标识2的对应关系来指示第四传输路径的状况等级，标识1可以是第四传输路径的标识，标识2可以是第四传输路径的状况等级的标识。例如，如图7所示，在宿主基站与UE2之间的通信路径为路径1时，其中，路径1为：
Figure PCTCN2020087781-appb-000020
标识1可以是回传链路1的标识，标识是2该回传链路1的状态等级，且该标识1和标识2是IAB节点1发送给宿主基站，或者，标识1可以是接入链路2的标识，标识是2该接入链路2的状态等级，且该标识1和标识2是IAB节点1发送给宿主基站。在宿主基站与UE2之间的通信路径为路径2时，其中，路径2为：
Figure PCTCN2020087781-appb-000021
Figure PCTCN2020087781-appb-000022
标识1可以是回传链路1对应的标识，标识2可以是回转链路1的状况等级，且该标识1和标识2是IAB节点1发送给宿主基站； 或者，标识1也可以是回传链路2对应的标识，标识2可以是回转链路2的状况等级，且该标识1和标识2是IAB节点2或IAB节点1发送给宿主基站，或者，标识1也可以是回传链路3对应的标识，标识2可以是回转链路3的状况等级，且该标识1和标识2是IAB节点3或IAB节点2发送给宿主基站，或者，标识1也可以是接入链路3对应的标识，标识2可以是接入链路3的状况等级，且该标识1和标识2是IAB节点3发送给宿主基站。
步骤S930，宿主基站根据第六信息，重配第四传输路径的上下行时隙资源配比。
具体地，宿主基站根据第六信息，确定第四传输路径的状况等级，并根据第四传输路径的状况等级，重配拥塞或失败链路的上下行时隙资源配比。其中，宿主基站可以根据上一次拥塞或失败链路的上下行时隙资源配比，重配拥塞或失败链路的上下行时隙资源配比。
宿主基站根据第四传输路径的状况等级，可以获知第四传输路径的缓存占有率，宿主基站根据第四传输路径的缓存占有率，重配第四传输路径的上下行时隙资源配比。从而宿主基站可以根据当前第四传输路径的缓存占有率，合理的对第四传输路径的上下行时隙资源进行分配，提高数据的传输性能。
例如，如图7所示，宿主基站与UE2之间的通信路径可以分为路径1和路径2，其中，路径1为：
Figure PCTCN2020087781-appb-000023
路径2为：
Figure PCTCN2020087781-appb-000024
Figure PCTCN2020087781-appb-000025
在宿主基站与UE2之间的通信路径为路径1时，该第六信息用于指示的是回传链路1的状况等级，该第六信息包括回传链路1的标识和该回传链路1的状况等级，宿主基站根据回转链路1的状况等级，并根据上一次回传链路1的上下行时隙资源配比，重新配置回传链路1的上下行时隙资源配比。例如，若回传链路1的状况等级为缓存占有率为0％-20％时，宿主基站可以在上一次回传链路1的上下行时隙资源配比的基础上，减少回传链路1的上下行时隙资源配比。又例如，若回传链路1的状况等级为缓存占有率为80％-100％时，宿主基站可以在上一次回传链路1的上下行时隙资源配比的基础上，增加回传链路1的上下行时隙资源配比。或者，该第六信息用于指示的是接入链路3的状况等级，该第六信息包括接入链路3的标识和接入链路3的状况等级，宿主基站根据接入链路3的状况等级，并根据上一次接入链路3的上下行时隙资源配比，重新配置接入链路3的上下行时隙资源配比。例如，若接入链路3的状况等级为缓存占有率为20％-40％时，宿主基站可以在上一次接入链路3的上下行时隙资源配比的基础上，减少接入链路3的上下行时隙资源配比。又例如，若接入链路3的状况等级为缓存占有率为80％-100％时，宿主基站可以在上一次接入链路3的上下行时隙资源配比的基础上，增加接入链路3的上下行时隙资源配比。
在宿主基站与UE2之间的通信路径为路径2时，该通信系统中有三个第一IAB节点都需向宿主基站发送第六信息。具体地，IAB节点1向宿主基站发送第六信息，第六信息用于指示的是回传链路1的状况等级，该第六信息包括回传链路1的标识和该回传链路1的状况等级，或第六信息用于指示的是回传链路2的状况等级，该第六信息包括回传链路2的标识和该回传链路2的状况等级；IAB节2向宿主基站发送第六信息，第六信息用于指示回传链路2的状况等级，该第六信息包括回传链路2的标识和该回传链路2的状况等级，或第六信息用于指示回传链路3的状况等级，该第六信息包括回传链路3的标识和该回传链路3的状况等级；和/或IAB节3向宿主基站发送第六信息，第六信息用于指示回 传链路3的状况等级，该第六信息包括回传链路3的标识和该回传链路3的状况等级，或第六信息用于指示接入链路3的状况等级，该第六信息包括接入链路3的标识和该接入链路3的状况等级。宿主基站需根据回转链路1的状况等级，并根据上一次回传链路1的上下行时隙资源配比，重新配置回传链路1的上下行时隙资源配比。宿主基站还可能需根据回转链路2的状况等级，并根据上一次回传链路2的上下行时隙资源配比，重新配置回传链路2的上下行时隙资源配比。宿主基站还可能需根据回转链路3的状况等级，并根据上一次回传链路3的上下行时隙资源配比，重新配置回传链路3的上下行时隙资源配比。宿主基站还可能需根据接入链路3的状况等级，并根据上一次接入链路3的上下行时隙资源配比，重新配置接入链路3的上下行时隙资源配比。例如，若回传链路1的状况等级为负载占有率为0％-10％时，宿主基站可以在上一次回传链路1的上下行时隙资源配比的基础上，减少回传链路1的上下行时隙资源配比；若回传链路2的状况等级为负载占有率为40％-50％时，宿主基站可以在上一次回传链路2的上下行时隙资源配比的基础上，不改变回传链路1的上下行时隙资源配比；若回传链路3的状况等级为负载占有率为80％-90％时，宿主基站可以在上一次回传链路3的上下行时隙资源配比的基础上，减少回传链路3的上下行时隙资源配比；若接入链路3的状况等级为负载占有率为10％-20％时，宿主基站可以在上一次接入链路3的上下行时隙资源配比的基础上，增加接入链路3的上下行时隙资源配比。
应理解，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
图10是从节点交互的角度示出的本申请一实施例提供的确定传输路径拥塞的方法1000的示意性流程图。该方法1000应用于包括宿主基站和第一IAB节点的通信系统中。如图10所示，该方法1000可以包括步骤S1010和步骤S1020。下面详细说明该方法中的各个步骤。
步骤S1010，第一IAB节点向宿主基站发送第七信息，第七信息包括第三数据包的PDCP PDU SN值和终端设备(user equipment，UE)数据无线承载(data radio bearer，DRB)期待的缓存大小，第三数据包的PDCP PDU SN是第一IAB节点按序成功向终端设备发送R个数据包中最大PDCP PDU SN或第一IAB节点向终端设备发送的R个数据包中最大的PDCP PDU SN，R大于1，且R为正整数。
可选地，第七信息包含在第一IAB节点与宿主基站之间的F1接口的用户面消息中。
可选地，F1接口的用户面消息还包括第四标识，该第四标识用于指示F1接口的用户面消息中包括第七信息。
F1接口的用户面消息中包括第四标识和第七信息，从而使能接收端正确解读该F1接口的用户面消息的长度，以及使能宿主基站确定该F1接口的用户面消息中是否包含第七信息。
步骤S1020，宿主基站根据第七信息，确定第五传输路径的拥塞情况，第五传输路径为第一IAB节点与宿主基站之间传输路径和/或第一IAB节点与终端设备之间的接入链路。
其中，第一IAB节点与宿主基站之间的传输路径包括一条或多条回传链路。在第一IAB节点与宿主基站直接通信的情况下，第一IAB节点与宿主基站之间的传输路径是第一IAB节点与宿主基站之间的回传链路。在第一IAB节点经由一个或多个第二IAB节点与 宿主基站通信的情况下，第一IAB节点与宿主基站之间的传输路径是第一IAB节点与第二IAB节点之间的回传链路、第二IAB节点与宿主基站的回传链路和/或对个第二IAB节点之间的回传链路。
在第三数据包的PDCP PDU SN值与第四数据包的PDCP PDU SN值的差值大于或等于第一门限值，宿主基站确定第五传输路径发生拥塞，第四数据包的PDCP PDU SN值为宿主基站发送向终端设备发送的K个数据包中最大的PDCP PDU SN，K大于1，且K为正整数。
例如，在宿主基站发送的数据包的个数为120的情况下，该第一门限值可以为80。例如，当第三数据包的SN的值为15，第四数据包的SN的值为120，则宿主基站可以确定第五传输路径存在拥塞或失败情况。又例如，第三数据包的SN的值为85，第四数据包的SN的值为120，则宿主基站可以确定第一传输路径的不存在拥塞情况。
在第五传输路径发生拥塞的情况下，宿主基站判断UE DRB所期待的缓存大小是否大于或等于第二门限值。
在UE DRB所期待的缓存大小大于或等于第二门限值的情况下，宿主基站可以确定第一IAB节点与宿主基站之间的传输路径上的第一回传链路发生拥塞，第一回传链路时第一IAB节点与宿主基站之间的传输路径上的任一回传链路；在UE DRB所期待的缓存大小低于第二门限值的情况下，宿主基站确定第一IAB节点与终端设备之间的接入链路发生拥塞。或者，在UE DRB所期待的缓存大小大于第二门限值的情况下，宿主基站可以确定第一IAB节点与宿主基站之间的传输路径上的第一回传链路发生拥塞，第一回传链路时第一IAB节点与宿主基站之间的传输路径上的任一回传链路；在UE DRB所期待的缓存大小低于或等于第二门限值的情况下，宿主基站确定第一IAB节点与终端设备之间的接入链路发生拥塞。
可选地，第一门限值是通信协议规定的，或者第一门限值是宿主基站配置的。
可选地，第二门限值是通信协议规定的，或者第二门限值是宿主基站配置的。
图11是从节点交互的角度示出的本申请一实施例提供的无线回传链路失败指示的方法1100的示意性流程图。如图11所示，该方法1100可以包括步骤S1110和步骤S1120。下面详细说明该方法中的各个步骤。
步骤S1110，第二IAB节点向第一节点发送无线回传链路失败指示信息，无线回传链路失败指示信息用于指示第二IAB节点与其父节点之间的无线回传链路发生失败或RRC重建立失败，第一节点是第一IAB节点或终端设备。
其中，第二IAB节点是第一IAB节点的父节点，终端设备是第二IAB节点所服务的终端设备。
可选地，无线回传链路失败指示信息可以通过在第二IAB节点发送的下行控制消息(downlink control information，DCI)中携带，该DCI的循环冗余校验(cyclic redundancy check，CRC)可以是寻呼无线网络临时标识(paging radio network tempory identity，P-RNTI)。具体的，可以在DCI中的短消息(short message)中的预留比特中添加1比特用于无线回传链路失败指示。例如用1比特中的1标识无线回传链路失败，0表示无线回传链路未失败；或用1比特中的0表示无线回传链路失败，1表示无线回传链路未失败。
可选地，无线回传链路失败指示还可以通过在第二IAB节点发送的广播消息中携带， 具体的可以携带于第二IAB节点发送的主信息块消息(master information block，MIB)，系统信息(system information block，SIB)或物理广播信道(physical broadcast channel，PBCH)等信令或信道中，其中SIB消息包括SIB1、SIB2等一系列SIB消息。
可选地，调度寻呼消息的DCI中包括第五标识，第五标识用于触发第一IAB节点立即读取广播消息。减少第一IAB节点等待读取广播消息的时延。
步骤S1120，第一节点根据无线回传链路失败指示信息，触发RRC重建立或触发小区重选。
以下，以两种情况为例，详细描述第一节点根据无线回传链路失败指示信息，进行第一操作。
情况A：第一节点处于RRC连接态(RRC conneted)。
若第一节点仅存在一个父节点，则第一节点基于回传链路失败指示链路指示，确定第一节点与第二IAB节点之间的链路失败或第一节点触发RRC重建立流程。
情况B：第一节点处于RRC空闲态(RRC idle)。
第一节点触发小区重选。
通过上述无线回传链路失败指示信息，第一节点能够感知第二IAB节点与第二IAB节点的父节点之间回传链路的链路情况，在第二IAB节点与第二IAB节点的父节点之间回传链路的链路发生失败或RRC重建立失败的情况下，第一节点可以提前进行小区重选或RRC重建立，寻找新的父节点进行接入，有效的降低了因第二IAB节点与第二IAB节点的父节点之间回传链路的链路发生失败或RRC重建立失败而导致的数据传输中断时间。
上文中结合图1至图11，详细描述了根据本申请实施例的数据的传输方法，下面将结合图12和图13，详细描述根据本申请实施例的用于无线回传网络的装置。
图12示出了本申请实施例提供的用于无线回传网络的装置1200，该装置1200可以是第一IAB节点，也可以为第一IAB节点中的芯片；或者，该装置1200也可以是宿主基站，也可以为宿主基站中的芯片；或者，该装置1200也可以是第一节点，也可以为第一节点中的芯片；或者，该装置1200也可以是第二IAB节点，也可以为第二IAB节点中的芯片。该装置1200包括：收发单元1210和处理单元1220。
在该装置1200是第一IAB节点的一种可能的实现方式中，装置1200用于执行上述方法400中第一IAB节点对应的各个流程和步骤。
收发单元1210，用于接收所述宿主基站发送给所述终端设备的N个数据包，所述N为正整数，且所述N大于1。
处理单元1220，用于从所述N个数据包中确定第一数据包的分组数据汇聚协议的协议数据单元序列号PDCP PDU SN，所述第一数据包的PDCP PDU SN是所述N个数据包中最大的PDCP PDU SN或所述N个数据包的PDCP PDU SN按照从小到大的顺序排列且从最小的PDCP PDU SN开始连续PDCP PDU SN中最大的PDCP PDU SN；
所述收发单元，还用于向所述宿主基站发送第一信息，所述第一信息包括所述第一数据包的PDCP PDU SN的值。
其中，处理单元1220可用于执行方法400中的步骤S420，收发单元1210可用于执行方法400中的步骤S410和步骤S430和方法500中步骤S520。
在该装置1200是第一IAB节点的另一种可能的实现方式中，装置1200用于执行上述方法800中第一IAB节点对应的各个流程和步骤。
收发单元1210，用于从所述第二IAB节点接收第四信息，所述第四信息用于指示第二传输路径是否发生拥塞或失败，其中，所述第二传输路径是所述第二IAB节点与所述宿主基站之间的回传链路；
收发单元1210，还用于向所述宿主基站发送第五信息，所述第五信息用于指示所述第三传输路径是否发生拥塞或失败，所述第三传输路径包括所述第一IAB节点与所述第二IAB节点之间的回传链路和/或所述第二传输路径。
其中，收发单元1210可用于执行方法800中的步骤S810和步骤S820。
在该装置1200是第一IAB节点的另一种可能的实现方式中，装置500用于执行上述方法200中第一节点对应的各个流程和步骤。
处理单元1220，用于确定第四传输路径的状况等级信息；其中，所述第四传输路径的状况等级包括所述第四传输路径的M个状况等级中的一个，所述M大于或等于2，且所述M为正整数，所述第四传输路径的M个状况等级是根据所述第四传输路径的缓存占有率划分的；所述第四传输路径是所述第一IAB节点与所述第一IAB节点的父节点之间的回传链路，和/或所述第四传输路径是所述第一IAB节点与所述第一IAB节点的子节点之间的回传链路；
收发单元1210，用于向所述宿主基站发送第六信息，所述第六信息用于指示所述第四传输路径的状况等级，所述第六信息包含在所述宿主基站分布式单元状态指示消息中。
其中，处理单元1220可用于执行方法900中的步骤S910，收发单元1210可用于执行方法900中的步骤S920。
在该装置1200是宿主基站的一种可能的实现方式中，装置1200用于执行上述方法400中宿主基站对应的各个流程和步骤。
收发单元1210，用于向所述第一IAB节点发送N个数据包，所述N个数据包是所述宿主基站发送给所述终端设备的数据包，所述N为正整数，且所述N大于1；
收发单元1210，还用于接收所述第一IAB节点发送的第一信息，所述第一信息包括第一数据包的分组数据汇聚协议的协议数据单元序列号PDCP PDU SN的值；其中，所述第一数据包的PDCP PDU SN是所述N个数据包中最大的PDCP PDU SN或所述第一数据包的PDCP PDU SN是所述N个数据包的PDCP PDU SN按照从小到大的顺序排列且从最小的PDCP PDU SN开始连续PDCP PDU SN中最大的PDCP PDU SN；
处理单元1220，用于根据所述第一信息，确定第一传输路径的拥塞或失败情况；
在所述第一IAB节点经由第二IAB节点与所述装置通信的情况下，所述第一传输路径包括所述第一IAB节点与所述第二IAB节点之间的回传链路和所述第二IAB节点与所述装置之间的回传链路。
其中，处理单元1220可用于执行方法400中的步骤S440和方法500中步骤S520，收发单元1210可用于执行方法400中的步骤S410和步骤S430。
在该装置1200是宿主基站的另一种可能的实现方式中，装置1200用于执行上述方法800中宿主基站对应的各个流程和步骤。
收发单元1210，用于接收所述第一IAB节点发送的第五信息，所述第五信息用于指 示第三传输路径是否发生拥塞或失败，其中，所述第三传输路径包括所述第一IAB节点与所述第二IAB节点之间的回传链路和/或所述第二IAB节点与所述宿主基站之间的回传链路；
处理单元1220，用于根据所述第五信息，确定所述第三传输路径的拥塞或失败的链路。
其中，处理单元1220可用于执行方法800中的步骤S830，收发单元1310可用于执行方法800中的步骤S820。
在该装置1200是宿主基站的另一种可能的实现方式中，装置1200用于执行上述方法900中宿主基站对应的各个流程和步骤。
收发单元1210，用于接收所述第一IAB节点发送的第六信息，所述第六信息用于指示所述第四传输路径的状况等级，其中，所述第六信息包含在所述宿主基站分布式单元状态指示消息中，所述第四传输路径的状况等级包括所述第四传输路径的M个状况等级中的一个，所述M大于或等于2，且所述M为正整数，所述第四传输路径的M个状况等级是根据所述第四传输路径的缓存占有率划分的；所述第四传输路径是所述第一IAB节点与所述第一IAB节点的父节点之间的回传链路，和/或所述第四传输路径是所述第一IAB节点与所述第一IAB节点的子节点之间的回传链路；
处理单元1220，用于根据所述第六信息，重配所述第四传输路径的上下行时隙资源配比。
其中，处理单元1220可用于执行方法900中的步骤S930，收发单元1210可用于执行方法900中的步骤S930。
在该装置1200是宿主基站的另一种可能的实现方式中，装置1200用于执行上述方法1000中宿主基站对应的各个流程和步骤。
收发单元1210，用于接收所述第一IAB节点发送的第七信息，所述第七信息包括第三数据包的PDCP PDU SN值和终端设备数据无线承载UE DRB，所述第三数据包的PDCP PDU SN是所述第一IAB节点按序成功向终端设备发送的R个数据包中最大PDCP PDU SN，所述R大于1，且所述R为正整数；
处理单元1220，用于根据所述第七信息，确定第五传输路径的拥塞情况，所述第五传输路径为所述第一IAB节点与所述宿主基站之间的传输路径和/或所述第一IAB节点与所述终端设备之间的接入链路。
其中，处理单元1220可用于执行方法1000中的步骤S1020，收发单元1310可用于执行方法1000中的步骤S1010。
在该装置1200是第一节点的实现方式中，装置1200用于执行上述方法1100中第一节点对应的各个流程和步骤。
收发单元1210，用于接收第二IAB节点发送的无线回传链路失败指示信息，所述无线回传链路失败指示信息用于指示所述第二IAB节点与其父节点之间的无线回传链路发生失败或无线资源控制RRC重建立失败；
处理单元1220，用于所述第一节点根据所述无线回传链路失败指示信息，触发RRC重建立或触发小区重选。
其中，处理单元1220可用于执行方法1100中的步骤S1120，收发单元1210可用于 执行方法1100中的步骤S1110。
在该装置1200是第二IAB节点的实现方式中，装置1200用于执行上述方法1100中第二IAB节点对应的各个流程和步骤。
处理单元1220，用于确定无线回传链路失败指示信息，所述无线回传链路失败指示信息用于指示所述第二IAB节点与其父节点之间的无线回传链路发生失败或无线资源控制RRC重建立失败；
收发单元1210，用于接向第一节点发送无线回传链路失败指示信息，所述第一节点是第一IAB节点或终端设备，所述第二IAB节点是所述第一节点的父节点。
其中，收发单元1210可用于执行方法1100中的步骤S1110。
应理解，各单元执行上述相应步骤的具体过程在上述方法实施例中已经详细说明，为了简洁，此处不再赘述。
应理解，这里的装置1200以功能单元的形式体现。这里的术语“单元”可以指应用特有集成电路(application specific integrated circuit，ASIC)、电子电路、用于执行一个或多个软件或固件程序的处理器(例如共享处理器、专有处理器或组处理器等)和存储器、合并逻辑电路和/或其它支持所描述的功能的合适组件。在一个可选例子中，本领域技术人员可以理解，装置1200可以具体为上述实施例中的第一IAB节点，装置1200可以用于执行上述方法实施例中与第一IAB节点对应的各个流程和/或步骤；或者，装置1200可以具体为上述实施例中的宿主基站，装置1200可以用于执行上述方法实施例中与宿主基站对应的各个流程和/或步骤；或者，装置1200可以具体为上述实施例中的第一节点，装置1200可以用于执行上述方法实施例中与第一节点对应的各个流程和/或步骤；或者，装置1200可以具体为上述实施例中的第二IAB节点，装置1200可以用于执行上述方法实施例中与第二IAB节点对应的各个流程和/或步骤，为避免重复，在此不再赘述。
上述各个方案的装置1200具有实现上述方法中宿主基站执行的相应步骤的功能；所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块；例如收发单元可以由发射机和接收机替代，其它单元，如处理单元等可以由处理器替代，分别执行各个方法实施例中的收发操作以及相关的处理操作。此外，装置1200中的收发单元也可以由发送单元和接收单元组成，对于执行与接收相关的操作，可以将该收发单元的功能理解为接收单元执行的接收操作，对于执行与发送相关的操作，可以将该收发单元的功能理解为发送单元执行的发送操作。
在本申请的实施例，图12中的装置也可以是芯片或者芯片系统，例如：片上系统(system on chip，SoC)。对应的，收发单元可以是该芯片的收发电路，在此不做限定。
图13示出了本申请实施例提供的另一用于无线回传网络的装置1300。应理解，装置1300可以具体为上述实施例中的第一IAB节点，并且可以用于执行上述方法实施例中与第一IAB节点对应的各个步骤和/或流程；或者，装置1300可以具体为上述实施例中的宿主基站，并且可以用于执行上述方法实施例中与宿主基站对应的各个步骤和/或流程；或者，装置1300可以具体为上述实施例中的第一节点，并且可以用于执行上述方法实施例中与第一节点对应的各个步骤和/或流程；或者，装置1300可以具体为上述实施例中的第二IAB节点，并且可以用于执行上述方法实施例中与第二IAB节点对应的各个步骤和/或流程。
装置1300包括处理器1310、收发器1320和存储器1330。其中，处理器1310、收发器1320和存储器1330通过内部连接通路互相通信，处理器1310可以实现装置1200中各种可能的实现方式中处理单元1220的功能，收发器1320可以实现装置1200中各种可能的实现方式中收发单元1210的功能。存储器1330用于存储指令，处理器1310用于执行存储器1330存储的指令，或者说，处理器1310可以调用这些存储指令实现装置1200中处理单元1220的功能，以控制收发器1320发送信号和/或接收信号。
可选地，该存储器1330可以包括只读存储器和随机存取存储器，并向处理器提供指令和数据。存储器的一部分还可以包括非易失性随机存取存储器。例如，存储器还可以存储设备类型的信息。该处理器1310可以用于执行存储器中存储的指令，并且当该处理器1310执行存储器中存储的指令时，该处理器1310用于执行上述与该第一IAB节点对应的方法实施例的各个步骤和/或流程；或者，该处理器1310用于执行上述与该宿主基站对应的方法实施例的各个步骤和/或流程；或者，该处理器1310用于执行上述与该第一节点对应的方法实施例的各个步骤和/或流程；或者，该处理器1310用于执行上述与该第二IAB节点对应的方法实施例的各个步骤和/或流程。
应理解，在本申请实施例中，上述装置1300的处理器1310可以是中央处理单元(central processing unit，CPU)，该处理器还可以是其他通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
在实现过程中，上述方法的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件单元组合执行完成。软件单元可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器执行存储器中的指令，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的 部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (30)

  1. 一种数据传输的方法，其特征在于，应用于包括宿主基站、第一接入与回传一体化IAB节点的通信系统中，其中，所述第一IAB节点是终端设备的接入节点，所述方法包括：
    所述第一IAB节点接收所述宿主基站发送给所述终端设备的N个数据包，所述N为正整数，且所述N大于1；
    所述第一IAB节点，从所述N个数据包中确定第一数据包的分组数据汇聚协议的协议数据单元序列号PDCP PDU SN，所述第一数据包的PDCP PDU SN是所述N个数据包的PDCP PDU SN中最大的PDCP PDU SN或所述第一数据包的PDCP PDU SN是所述N个数据包的PDCP PDU SN按照从小到大的顺序排列且从最小的PDCP PDU SN开始连续PDCP PDU SN中最大的PDCP PDU SN；
    所述第一IAB节点向所述宿主基站发送第一信息，所述第一信息包括所述第一数据包的PDCP PDU SN的值。
  2. 根据权利要求1中所述的方法，其特征在于，所述方法还包括：
    所述第一IAB节点向所述宿主基站发送第二信息，所述第二信息用于指示第一传输路径是否发生拥塞或失败；
    在所述第一IAB节点经由第二IAB节点与所述宿主基站通信的情况下，所述第一传输路径包括所述第一IAB节点与所述第二IAB节点之间的回传链路和/或所述第二IAB节点与所述宿主基站之间的回传链路。
  3. 根据权利要求2所述的方法，其特征在于，在所述第一IAB节点直接与所述宿主基站连接的情况下，所述第一传输路径是所述第一IAB节点与宿主节点之间的回传链路。
  4. 根据权利要求2所述的方法，其特征在于，所述方法还包括：
    所述第一IAB节点从所述第二IAB节点接收第三信息，所述第三信息用于指示所述第二IAB节点与所述宿主基站之间的链路是否发生拥塞或失败。
  5. 根据权利要求1所述的方法，其特征在于，所述第一信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
  6. 根据权利要求2所述的方法，其特征在于，所述第二信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
  7. 根据权利要求5或6所述的方法，其特征在于，所述F1接口的用户面消息还包括第一标识和/或第二标识，所述第一标识用于指示所述F1接口的用户面消息中包括所述第一信息，所述第二标识用于指示所述F1接口用户面消息中包括所述第二信息。
  8. 一种数据传输的方法，其特征在于，应用于包括宿主基站、第一接入与回传一体化IAB节点的通信系统中，其中，所述第一IAB节点是终端设备的接入节点，所述方法包括：
    所述宿主基站向所述第一IAB节点发送N个数据包，所述N个数据包是所述宿主基站发送给所述终端设备的数据包，所述N为正整数，且所述N大于1；
    所述宿主基站接收所述第一IAB节点发送的第一信息，所述第一信息包括第一数据包 的分组数据汇聚协议的协议数据单元序列号PDCP PDU SN的值；其中，所述第一数据包的PDCP PDU SN是所述N个数据包中最大的PDCP PDU SN或所述第一数据包的PDCP PDU SN是所述N个数据包的PDCP PDU SN按照从小到大的顺序排列且从最小的PDCP PDU SN开始连续PDCP PDU SN中最大的PDCP PDU SN；
    所述宿主基站根据所述第一信息，确定第一传输路径的拥塞或失败情况；
    在所述第一IAB节点经由第二IAB节点与所述宿主基站通信的情况下，所述第一传输路径包括所述第一IAB节点与所述第二IAB节点之间的回传链路和/或所述第二IAB节点与所述宿主基站之间的回传链路。
  9. 根据权利要求8所述的方法，其特征在于，所述方法还包括：
    所述宿主基站接收所述第一IAB节点发送的第二信息，所述第二信息用于指示所述第一传输路径是否发生拥塞或失败。
  10. 根据权利要求8或9所述的方法，其特征在于，在所述第一IAB节点直接与所述宿主基站连接的情况下，所述第一传输路径是所述第一IAB节点与所述宿主节点之间的回传链路。
  11. 根据权利要求8至10中任一项所述的方法，其特征在于，所述宿主基站根据所述第一信息，确定第一传输路径的拥塞或失败情况包括：
    所述宿主基站根据所述第一信息和所述第二信息，确定所述第一传输路径的拥塞或失败情况。
  12. 根据权利要求11所述的方法，其特征在于，所述宿主基站根据所述第一信息和所述第二信息，确定所述第一传输路径的拥塞或失败情况包括：
    所述宿主基站根据所述第一数据包的PDCP PDU SN的值和所述宿主基站发送的第二数据包的PDCP PDU SN的值，确定所述第一传输路径的是否存在拥塞或失败情况，其中，所述第二数据包的PDCP PDU SN是所述宿主基站已发送的L个数据包中最大的PDCP PDU SN，所述L≥N，且所述L为正整数；
    在所述第一传输路径存在拥塞或失败的情况下，所述宿主基站根据所述第二信息，确定所述第一传输路径中拥塞或失败的链路。
  13. 根据权利要求8至12中任一项所述的方法，其特征在于，所述方法还包括：
    在所述第一传输路径中存在拥塞或失败的链路的情况下，所述宿主基站对所述拥塞或失败的链路更改路径。
  14. 根据权利要求8所述的方法，其特征在于，所述第一信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
  15. 根据权利要求9所述的方法，其特征在于，所述第二信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
  16. 根据权利要求14或15所述的方法，其特征在于，所述F1接口的用户面消息还包括第一标识和/或第二标识，所述第一标识用于指示所述F1接口的用户面消息中包括所述第一信息，所述第二标识用于指示所述F1接口的用户面消息中包括所述第二信息。
  17. 一种数据传输的方法，其特征在于，应用于包括宿主基站、第一接入与回传一体化IAB节点和第二IAB节点的通信系统中，其中，所述第一IAB节点是终端设备的接入节点，所述第一IAB节点经由所述第二IAB节点与所述宿主基站通信，所述方法包括：
    所述第一IAB节点从所述第二IAB节点接收第四信息，所述第四信息用于指示第二传输路径是否发生拥塞或失败，其中，所述第二传输路径是所述第二IAB节点与所述宿主基站之间的回传链路；
    所述第一IAB节点向所述宿主基站发送第五信息，所述第五信息用于指示所述第三传输路径是否发生拥塞或失败，所述第三传输路径包括所述第一IAB节点与所述第二IAB节点之间的回传链路和/或所述第二传输路径。
  18. 根据权利要求17所述的方法，其特征在于，所述第五信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
  19. 根据权利要求18所述的方法，其特征在于，所述F1接口的用户面消息还包括第三标识，所述第三标识用于指示所述F1接口的用户面消息中包括所述第五信息。
  20. 一种数据传输的方法，其特征在于，应用于包括宿主基站、第一接入与回传一体化IAB节点和第二IAB节点的通信系统中，其中，所述第一IAB节点是终端设备的接入节点，所述第一IAB节点经由所述第二IAB节点与所述宿主基站通信，所述方法包括：
    所述宿主基站接收所述第一IAB节点发送的第五信息，所述第五信息用于指示第三传输路径是否发生拥塞或失败，其中，所述第三传输路径包括所述第一IAB节点与所述第二IAB节点之间的回传链路和/或所述第二IAB节点与所述宿主基站之间的回传链路；
    所述宿主基站根据所述第五信息，确定所述第三传输路径的拥塞或失败的链路。
  21. 根据权利要求20所述的方法，其特征在于，所述方法还包括：
    在所述第三传输路径中存在拥塞或失败的链路的情况下，所述宿主基站对所述拥塞或失败的链路更改路径。
  22. 根据权利要求21所述的方法，其特征在于，所述第五信息包含在所述第一IAB节点与所述宿主基站之间的F1接口的用户面消息中。
  23. 根据权利要求22所述的方法，其特征在于，所述F1接口的用户面消息还包括第三标识，所述第三标识用于指示所述F1接口的用户面消息中包括所述第五信息。
  24. 一种通信装置，其特征在于，包括用于执行如权利要求1至7或权利要求17至19中任一项所述的方法的各个模块或单元。
  25. 一种通信装置，其特征在于，包括用于执行如权利要求8至16或权利要求20至23中任一项所述的方法的各个模块或单元。
  26. 一种计算机程序产品，其特征在于，所述计算机程序产品包括：计算机程序代码，所述计算机程序代码被计算机运行时，使得所述计算机执行如权利要求1至7或权利要求17至19中任一项所述的方法。
  27. 一种计算机程序产品，其特征在于，所述计算机程序产品包括：计算机程序代码，所述计算机程序代码被计算机运行时，使得所述计算机执行如权利要求8至16或权利要求20至23中任一项所述的方法。
  28. 一种计算机可读介质，其特征在于，所述计算机可读介质存储有程序代码，所述程序代码包括用于执行如权利要求1至7或权利要求17至19中任一项所述的方法。
  29. 一种计算机可读介质，其特征在于，所述计算机可读介质存储有程序代码，所述程序代码包括用于执行如权利要求8至16或权利要求20至23中任一项所述的方法。
  30. 一种无线回传网络系统，其特征在于，包括用于执行权利要求1至7或权利要求 17至19中任一项所述的方法的通信装置，和/或用于执行权利要求8至16或权利要求20至23中任一项所述的方法的通信装置。
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