WO2023011245A1 - Procédé de communication et appareil de communication - Google Patents

Procédé de communication et appareil de communication Download PDF

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Publication number
WO2023011245A1
WO2023011245A1 PCT/CN2022/107829 CN2022107829W WO2023011245A1 WO 2023011245 A1 WO2023011245 A1 WO 2023011245A1 CN 2022107829 W CN2022107829 W CN 2022107829W WO 2023011245 A1 WO2023011245 A1 WO 2023011245A1
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WIPO (PCT)
Prior art keywords
network device
node
target
wireless backhaul
interface
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PCT/CN2022/107829
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English (en)
Chinese (zh)
Inventor
孙飞
朱元萍
史玉龙
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华为技术有限公司
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Publication of WO2023011245A1 publication Critical patent/WO2023011245A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data

Definitions

  • the present application relates to the communication field, and more specifically, to a communication method and a communication device.
  • Wireless backhaul equipment provides an idea to solve the above problems. Both the access link (AL) and the backhaul link (BL) of the wireless backhaul equipment adopt wireless transmission solutions, which can reduce fiber deployment.
  • the wireless backhaul device may be a relay node (relay node, RN), for example, an integrated access backhaul (integrated access backhaul, IAB) node.
  • relay node relay node, RN
  • IAB integrated access backhaul
  • the wireless backhaul device can return the data packet of the terminal to the host node through the wireless backhaul link, and can also send the data packet from the host node to the terminal through the wireless access link.
  • a communication network composed of one or more wireless backhaul devices may be called a wireless backhaul network or a relay network.
  • a relay node will only be connected to one host node.
  • a communication scenario in which a relay node is connected to multiple host nodes appears.
  • the relay node is connected to the core network through the host node.
  • the relay node is connected to the 5G network through the host node.
  • Core network 5G core, 5GC.
  • 5G architecture of dual connectivity (DC) or multi-connectivity (MC) for example: non-standalone (NSA) or NR-DC scenarios, etc.
  • EPC evolved packet core network
  • evolved NodeB evolved NodeB
  • eNB evolved NodeB
  • the topology on which the dual connection architecture of the F1 interface in the current IAB network depends may include redundant topology (topology redundancy) and non-redundant topology.
  • topology redundancy redundant topology
  • non-redundant topology non-redundant topology
  • the embodiment of the present application provides a communication method and a communication device, which can determine which dual connection mode of the F1 interface is adopted, thereby improving the stability of service communication between the IAB node and the terminal.
  • a communication method including: a first network device acquires capability information of at least one second network device, and the capability information indicates whether it has an IAB host capability and/or supports transmission of an F1 interface application protocol (application protocol, F1AP) message, the first network device is the master node (master node, MN) of the wireless backhaul node.
  • the first network device selects a target second network device from at least one second network device as a secondary node (secondary node, SN) of the wireless backhaul node according to the capability information of the at least one second network device.
  • the first network device configures the dual connection mode of the F1 interface of the wireless backhaul node.
  • the first network device can determine the dual connection mode for configuring the F1 interface of the wireless backhaul node according to the acquired capability information of the network device, which is beneficial to improve the stability of the business communication between the IAB node and the terminal, Improve terminal service experience.
  • the dual connection mode of the F1 interface includes transmitting the F1AP message through the air interface and transmitting the F1 interface data of the user plane through the backhaul link.
  • the F1AP message and the F1 interface data of the user plane can be transmitted through different paths, which is beneficial to improve the data transmission rate.
  • the transmission of the F1AP message through the air interface includes: transmitting the F1AP message to the target second network device through the air interface between the wireless backhaul node and the first network device .
  • the F1AP message is transmitted to the first network device through an air interface between the wireless backhaul node and the target second network device.
  • the F1AP message can be transmitted to the SN through the air interface between the wireless backhaul node and the MN.
  • the F1AP message can be transmitted to the MN through the air interface between the wireless backhaul node and the SN.
  • the backhaul link is a communication link between the wireless backhaul node and the first network device or the target second network device.
  • the F1AP message and the F1 interface data of the user plane are transmitted through a backhaul link, and the backhaul link is between the wireless backhaul node and the first network device and The communication link between the target second network device.
  • the wireless backhaul node can transmit F1AP messages through the backhaul link with the first network device, and/or F1 interface data on the user plane;
  • the backhaul node may also transmit the F1AP message and/or F1 interface data of the user plane through the backhaul link with the second network device.
  • Which backlink the wireless backhaul node transmits which F1 interface information can be determined by the wireless backhaul node itself, or can be configured or updated by the network device .
  • the first network device and the target second network device are the host nodes of the wireless backhaul node, and the F1 interface of the wireless backhaul node can adopt a redundant topology dual connection mode.
  • the F1AP message The F1 interface data with the user plane may be transmitted through the backhaul link between the wireless backhaul node and the first network device and the target second network device.
  • Such a dual connection mode is conducive to improving the stability of data transmission.
  • the first network device acquiring capability information of at least one second network device includes: the first network device receives at least one second network device from at least one second network device Capability information of network devices.
  • the first network device determines whether the Xn interface between the first network device and at least one second network device supports the transmission of the F1AP message through the Xn interface application protocol XnAP message . According to the capability information of at least one second network device, the first network device selects the target second network device as the secondary node SN of the wireless backhaul node from at least one second network device, including: The capability information of the network device and whether the Xn interface supports the transmission of the F1AP message through the XnAP message, and select the target second network device from at least one second network device as the SN of the wireless backhaul node.
  • the first network device exchanges capability information with at least one second network device, it is also necessary to exchange whether the Xn interface supports the transmission of F1AP messages through XnAP messages, which is conducive to the stability of F1AP message transmission.
  • the obtaining capability information of at least one second network device by the first network device includes: the first network device receiving at least one second network device from the wireless backhaul node Capability information of the network device; or, the first network device receives capability information of at least one second network device from the network management device.
  • the first network device receives a measurement report of at least one second network device, where the measurement report includes a measurement report between the wireless backhaul node and the at least one second network device Signal quality.
  • the first network device selects the target second network device as the secondary node SN of the wireless backhaul node from at least one second network device, including: Based on the capability information of the network device and the measurement report, the target second network device is selected from at least one second network device as the SN of the wireless backhaul node.
  • the first network device configuring the dual connection mode of the F1 interface of the wireless backhaul node includes: the first network device sends the first network device to the wireless backhaul node One indication information, the first indication information indicates the dual connection mode of the F1 interface.
  • the first indication information is default backhaul radio link control (default BH RLC) channel configuration information.
  • the default BH RLC channel is the BH RLC channel used by the wireless backhaul node to send the F1AP message for the first time.
  • the first network device may instruct the wireless backhaul node to transmit the F1AP in a form, that is, through the backhaul link or through the air interface.
  • the first network device sends the first indication information to the wireless backhaul node through the target second network device.
  • the first network device broadcasts capability information of the first network device.
  • the first network device receives access request information from the wireless backhaul node.
  • the first network device broadcasts the capability information of the first network device to the outside world, so that the wireless backhaul node can perceive the support of the first network device for the IAB host capability, which is beneficial for the wireless backhaul node to access the appropriate
  • the network device on the network serves as the MN.
  • a communication method including: a target second network device sends capability information of the target second network device, where the capability information indicates whether it has an IAB hosting capability and/or supports transmission of F1AP messages through an air interface.
  • the target second network device receives the access request information from the wireless backhaul node, and the target second network device is a secondary node SN of the wireless backhaul node.
  • the target second network device is the SN added by the MN for the wireless backhaul node that matches the dual connection mode, which is conducive to improving the stability of the business communication between the IAB node and the terminal, and improving the service experience of the terminal .
  • the dual connection mode of the F1 interface includes transmitting the F1AP message through the air interface and transmitting the F1 interface data of the user plane through the backhaul link.
  • the transmission of the F1AP message through the air interface includes: transmitting the F1AP message to the target second network device through the air interface between the wireless backhaul node and the first network device .
  • the F1AP message is transmitted to the first network device through an air interface between the wireless backhaul node and the target second network device.
  • the backhaul link is a backhaul link between the wireless backhaul node and the first network device or the target second network device.
  • the F1AP message and the F1 interface data of the user plane are transmitted through a backhaul link, and the backhaul link is between the wireless backhaul node and the first network device and The communication link between the target second network device.
  • the sending the capability information of the target second network device by the target second network device includes: the target second network device sending the target Capability information of the second network device.
  • the method further includes: the target second network device sending whether the Xn interface between the target second network device and the first network device supports transmission of F1AP messages through XnAP messages.
  • the sending of the capability information of the target second network device by the target second network device includes: the target second network device broadcasting the capability of the target second network device information.
  • the target second network device sends second indication information to the wireless backhaul node, where the second indication information is used to indicate the dual connectivity mode of the F1 interface.
  • the second indication information includes default BH RLC channel configuration information.
  • the default BH RLC channel is the BH RLC channel used by the wireless backhaul node to send the F1AP message for the first time.
  • the target second network device sends the second indication information to the wireless backhaul node through the first network device.
  • a communication method including: a wireless backhaul node acquires capability information of at least one network device, and the capability information is used to indicate whether it has an IAB hosting capability and/or supports transmission of F1AP messages through an air interface.
  • the wireless backhaul node accesses the first network device based on the capability information of at least one network device, and the first network device is the master node MN of the wireless backhaul node.
  • the wireless backhaul node receives first configuration information, where the first configuration information is used to configure a target second network device as a secondary node SN of the wireless backhaul node.
  • the wireless backhaul node receives second configuration information, where the second configuration information is used to configure the dual connectivity mode of the F1 interface of the wireless backhaul node.
  • the wireless backhaul node can determine the MN and SN according to the acquired capability information of the network device, the MN and/or SN have the IAB host capability, and configure the F1 interface with the host node according to the second configuration information
  • the dual connection mode that matches the capability information is beneficial to improve the stability of the service communication between the IAB node and the terminal, and improve the service experience of the terminal.
  • the dual connectivity manner includes transmitting the F1AP message through the air interface and transmitting the F1 interface data of the user plane through the backhaul link.
  • the F1AP message and the F1 interface data of the user plane are transmitted through a backhaul link, and the backhaul link is between the wireless backhaul node and the first network device and The backhaul link between the target second network device.
  • the second configuration information includes default BH RLC channel configuration information.
  • the default BH RLC channel is the BH RLC channel used by the wireless backhaul node to send the F1AP message for the first time.
  • the wireless backhaul node sends the F1AP message through the backhaul link between the wireless backhaul node and the first network device or the target second network device.
  • a communication method including: a centralized unit (centralized unit, CU) of a first network device determines from multiple candidate paths that the CU of the first network device and the distributed unit of the second network device (distributed unit, DU) between the target path.
  • the CU of the first network device transmits data to the DU of the second network device through the target path.
  • the CU of the first network device can determine from multiple candidate paths to achieve the simple goal The path is beneficial to reduce the loss of data packets and improve the reliability of data transmission.
  • the CU of the first network device determines the target path as an example.
  • the DU of the second network device may also determine the target path for data transmission, which is not limited in the present application.
  • the multiple candidate paths include at least one of the following: path 1: the CU of the first network device connects to the second network device through an Internet protocol (internet protocol, IP) network DU of the network device. Or, path 2: the CU of the first network device passes through the CU of the second network device to the DU of the second network device. Or, path 3: the CU of the first network device passes through the DU of the first network device to the DU of the second network device.
  • IP Internet protocol
  • the IP paths of path 1 and path 2 are normal, and the IP path of path 3 is abnormal.
  • the CU of the first network device determines the target path between the CU of the first network device and the DU of the second network device from multiple candidate paths, including: if the source IP address of the data packet to be transmitted is in the first network
  • the filtering unit of the IP router between the CU of the device and the DU of the second network device is in the white list, or the IP router between the CU of the first network device and the DU of the second network device does not start the filtering unit, the CU of the first network device determines that path 1 is the target path.
  • path 2 needs to add an outer layer IP once at the DU of the second network device, and add an outer layer IP once at the CU of the second network device, this implementation is complicated, and Path 1 only needs to add an outer layer IP at the DU of the second network device once, which is easy to implement, so path 1 is selected as the target path to transmit data.
  • the IP paths of path 1 and path 3 are normal, and the IP path of path 2 is abnormal.
  • the CU of the first network device determines the target path between the CU of the first network device and the DU of the second network device from multiple candidate paths, including: if the DU of the first network device and the DU of the second network device If a tunnel exists between the DUs of the first network device, the CU of the first network device determines that path 3 is the target path.
  • tunnel transmission is more stable than IP network transmission
  • path 3 is selected as the target path for data transmission .
  • the IP paths of path 1 and path 3 are normal, and the IP path of path 2 is abnormal.
  • the CU of the first network device determines the target path between the CU of the first network device and the DU of the second network device from multiple candidate paths, including: if the DU of the first network device and the DU of the second network device If an IP network is used between the DUs, the CU of the first network device determines that path 1 or path 3 is the target path.
  • the selection of path 1 and path 3 is implemented based on the base station.
  • the IP paths of path 2 and path 3 are normal, and the IP path of path 1 is abnormal; the CU of the first network device determines the first The target path between the CU of the network device and the DU of the second network device includes: the CU of the first network device determines that path 3 is the target path.
  • path 2 is complex to implement, and the data transmission between DU 1 of the first network device and CU 1 of the first network device in path 3 is consistent with the original data packet processing method, the implementation is simple, so Select path 3 as the target path to transfer data.
  • the IP paths of path 1, path 2, and path 3 are normal.
  • the CU of the first network device determines a target path between the CU of the first network device and the DU of the second network device from multiple candidate paths, including: the CU of the first network device determines that path 1 or path 3 is The target path.
  • path 1 and path 3 are preferred. Since these two paths are easy to implement, the target path can be determined in path 1 and path 3.
  • the method further includes: the CU of the first network device determines how many The IP paths of the candidate paths are normal or abnormal.
  • the first network device before determining the target path, the first network device first needs to test the IP path condition of each candidate path, so that the candidate paths with abnormal IP paths can be eliminated, which is beneficial to the reliability of data transmission.
  • a communication device including: configured to execute the method in any possible implementation manner in any one of the foregoing aspects.
  • the apparatus includes a module for executing the method in any possible implementation manner in any of the foregoing aspects.
  • the device may include modules corresponding to one-to-one execution of the methods/operations/steps/actions described in the above aspects.
  • the modules may be hardware circuits, software, or a combination of hardware circuits and software. accomplish.
  • the device is a communication chip
  • the communication chip may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.
  • the apparatus is a communications device, which may include a transmitter for sending information or data, and a receiver for receiving information or data.
  • the apparatus is configured to execute the method in any of the foregoing aspects or any possible implementation manners of the various aspects, and the apparatus may be configured in the foregoing first network device, the target second network device, or a wireless backhaul node, Or the device itself is the first network device, the target second network device or the wireless backhaul node.
  • another communication device including a processor and a memory, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the device performs any of the above-mentioned aspects.
  • processors there are one or more processors, and one or more memories.
  • the memory may be integrated with the processor, or the memory may be set separately from the processor.
  • the device is a communication device, and the communication device also includes a transmitter (transmitter) and a receiver (receiver).
  • the transmitter and the receiver can be set separately or integrated together, called a transceiver ( transceiver).
  • a processor including: an input circuit, an output circuit, and a processing circuit.
  • the processing circuit is configured to receive a signal through the input circuit, and transmit a signal through the output circuit, so that the processor executes the method in any possible implementation manner in any of the foregoing aspects.
  • the above-mentioned processor can be a chip
  • the input circuit can be an input pin
  • the output circuit can be an output pin
  • the processing circuit can be a transistor, a gate circuit, a flip-flop, and various logic circuits.
  • the input signal received by the input circuit may be received and input by, for example but not limited to, the receiver
  • the output signal of the output circuit may be, for example but not limited to, output to the transmitter and transmitted by the transmitter
  • the circuit may be the same circuit, which is used as an input circuit and an output circuit respectively at different times.
  • the embodiment of the present application does not limit the specific implementation manners of the processor and various circuits.
  • a communication system including: a device for realizing the above-mentioned first aspect or any one of the methods that may be realized in the first aspect, and for realizing the above-mentioned second aspect or any one of the second aspect
  • a device for realizing the above-mentioned first aspect or any one of the methods that may be realized in the first aspect and for realizing the above-mentioned second aspect or any one of the second aspect
  • An apparatus for a possible implementation of the method and an apparatus for implementing the third aspect or any one of the possible implementation methods of the third aspect.
  • the communication system may further include other devices that interact with the first network device, the target second network device and/or the wireless backhaul node in the solutions provided by the embodiments of the present application.
  • a computer program product includes: a computer program (also referred to as code, or an instruction), which, when the computer program is executed, causes the computer to perform any of the above-mentioned aspects.
  • a computer program also referred to as code, or an instruction
  • a computer-readable medium stores a computer program (also referred to as code, or instruction) which, when running on a computer, causes the computer to perform any of the above-mentioned aspects.
  • a computer program also referred to as code, or instruction
  • Fig. 1 is a schematic diagram of an IAB network communication system
  • Fig. 2 is a schematic diagram of a control plane protocol stack in an IAB network
  • Fig. 3 is a schematic diagram of a user plane protocol stack in an IAB network
  • FIG. 4 is a schematic diagram of a communication scenario
  • FIG. 5 is a schematic diagram of a dual connection communication scenario
  • Fig. 6 is a schematic diagram of a communication architecture
  • FIG. 7 is a schematic diagram of a communication scenario A
  • FIG. 8 is a schematic diagram of a communication scenario B
  • FIG. 9 is a schematic diagram of a communication scenario C
  • FIG. 10 is a schematic diagram of a communication scenario D
  • Fig. 11 is a schematic diagram of another communication architecture
  • FIG. 12 is a schematic diagram of an IAB network architecture provided by an embodiment of the present application.
  • FIG. 13 is a schematic flowchart of a communication method provided by an embodiment of the present application.
  • FIG. 14 is a schematic diagram of a topology provided by an embodiment of the present application.
  • Fig. 15 is a schematic diagram of another topology provided by the embodiment of the present application.
  • Fig. 16 is a schematic diagram of another topology provided by the embodiment of the present application.
  • Fig. 17 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 18 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 19 is a schematic diagram of a candidate path provided by an embodiment of the present application.
  • FIG. 20 is a schematic diagram of another topology provided by the embodiment of the present application.
  • Fig. 21 is a schematic block diagram of a communication device provided by an embodiment of the present application.
  • Fig. 22 is a schematic block diagram of another communication device provided by an embodiment of the present application.
  • Fig. 23 is a schematic block diagram of another communication device provided by an embodiment of the present application.
  • Fig. 24 is a schematic block diagram of another communication device provided by an embodiment of the present application.
  • At least one means one or more, and “multiple” means two or more.
  • “And/or” describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the contextual objects are an “or” relationship.
  • “At least one of the following” or similar expressions refer to any combination of these items, including any combination of single or plural items.
  • At least one (one) of a, b and c may represent: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c, wherein a, b, c can be single or multiple.
  • the communication systems applicable to the embodiments of the present application include but are not limited to: narrow band-internet of things (narrow band-internet of things, NB-IoT) system, wireless local area network (wireless local access network, WLAN) system, long term evolution ( long term evolution (LTE) system, next-generation 5G mobile communication system or subsequent evolution communication system, such as new radio (NR) communication system.
  • narrow band-internet of things narrow band-internet of things
  • WLAN wireless local area network
  • LTE long term evolution
  • 5G mobile communication system such as new radio (NR) communication system.
  • the donor base station can serve as the donor node of the IAB node.
  • the host base station may include but not limited to: next generation base station (generation nodeB, gNB), evolved node B (evolved Node B, eNB), radio network controller (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 Node B or home Node B), transmission point (transmission and reception point or transmission point ), roadside unit (RSU) with base station function, baseband unit (BBU), radio remote unit (Remote Radio Unit, RRU), active antenna unit (active antenna unit, AAU), One or a group of antenna panels, or nodes with base station functions in subsequent evolution systems, etc.
  • generation nodeB, gNB next generation base station
  • eNB evolved node B
  • RNC radio network controller
  • node B Node B, NB
  • base station controller base
  • the donor base station may be one entity, and may also include a centralized unit CU entity plus at least one distributed unit DU entity.
  • the interface between the CU and the DU may be referred to as an F1 interface.
  • the two ends of the F1 interface are the CU and the DU.
  • the opposite end of the F1 interface of the CU is the DU, and the opposite end of the F1 interface of the DU is the CU.
  • the F1 interface may further include a control plane F1 interface (F1-C) and a user plane F1 interface (F1-U).
  • the CU of the host base station may be referred to as Donor CU for short
  • the DU of the host base station may be referred to as Donor DU for short.
  • the Donor CU may also be a form in which the control plane (control plane, CP) and the user plane (user plane, UP) are separated.
  • a CU may be composed of one CU-CP and one (or more) CU-UP.
  • a terminal is sometimes referred to as a user equipment (user equipment, UE), a mobile station, a terminal device, and the like.
  • Terminals can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (Internet of Things) of things, IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc.
  • Terminals can be mobile phones, tablet computers, computers with wireless transceiver functions, wearable devices, vehicles, drones, helicopters, airplanes, ships, robots, robotic arms, smart home devices, etc.
  • Terminals may include, but are not limited to: user equipment UE, mobile station, mobile device, terminal device, user agent, cellular phone, cordless phone, session initiation protocol (session initiation protocol, SIP) phone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (PDA), handheld devices with wireless communication capabilities, computing devices, other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices (such as smart watches, smart bracelets, Smart glasses, etc.), smart furniture or home appliances, vehicle equipment in vehicle to everything (V2X), terminal equipment with relay function, customer premises equipment (CPE), IAB nodes (specifically IAB The MT of the node or the IAB node as the terminal role), etc., the application does not limit the specific name and implementation form of the terminal.
  • V2X vehicle equipment in vehicle to everything
  • CPE customer premises equipment
  • IAB nodes specifically IAB The MT of the node or the IAB node as the terminal role
  • the IAB node may include at least one mobile terminal (mobile terminal, MT) and at least one distributed unit DU (distributed unit, DU).
  • An IAB node may be an entity, for example, the IAB node includes at least one MT function and at least one DU function.
  • the IAB node may also include multiple entities, for example, the IAB node includes at least one MT entity and at least one DU entity.
  • the MT entity and the DU entity can communicate with each other, for example, communicate with each other through a network cable.
  • an IAB node When an IAB node faces its parent node (the parent node may be a host base station or other IAB nodes), it can be used as a terminal, for example, in various scenarios where the above-mentioned terminal is applied, that is, the terminal role of the IAB node. In this case, it is the MT function or MT entity that provides the terminal role for the IAB node.
  • the MT function or MT entity that provides the terminal role for the IAB node.
  • an IAB node faces its child nodes (the child nodes can be other IAB nodes or terminals)
  • it can act as a network device, that is, the network device role of the IAB node.
  • it is the DU function or DU entity that provides the network device role for the IAB node.
  • the MT of the IAB node may be referred to as IAB-MT for short, and the DU of the IAB node may be referred to as IAB-DU for short.
  • the IAB node can access the host base station, and can also connect to the host base station through other IAB nodes.
  • the IAB network supports multi-hop networking and multi-connection networking to ensure the reliability of service transmission.
  • the IAB node regards the IAB node providing the backhaul service as a parent node, and accordingly, the IAB node can be regarded as a child node of its parent node.
  • the terminal may also regard the IAB node which it accesses as a parent node, and correspondingly, the IAB node may also regard the terminal which it accesses as a child node.
  • the IAB node may regard the host base station that it accesses as a parent node, and correspondingly, the host base station may also regard the IAB node that accesses itself as a child node.
  • Fig. 1 is a schematic diagram of an IAB network communication system.
  • the communication system includes a terminal, an IAB node, and a host base station.
  • IAB network is just an example, and may be replaced with “wireless backhaul network” or “relay network”.
  • IAB node is just an example, and may be replaced with “wireless backhaul device”, “wireless backhaul node” or “relay node”.
  • the parent node of the IAB node 1 includes a master base station.
  • IAB node 1 is also the parent node of IAB node 2 or IAB node 3 .
  • the parent node of terminal 1 includes IAB node 4 .
  • the child nodes of IAB node 4 include terminal 1 or terminal 2 .
  • the IAB node directly accessed by the terminal may be referred to as an access IAB node.
  • the IAB node 4 in FIG. 1 is the access IAB node of the terminal 1 and the terminal 2 .
  • the IAB node 5 is the access IAB node of the terminal 2 .
  • the nodes on the uplink transmission path from the IAB node to the donor base station may be referred to as upstream nodes (upstream nodes) of the IAB node.
  • the upstream node may include a parent node, a parent node (or a grandparent node) of the parent node, and the like.
  • IAB node 1 and IAB node 2 in FIG. 1 may be referred to as upstream nodes of IAB node 5 .
  • the nodes on the downlink transmission path from the IAB node to the terminal may be referred to as downstream nodes (downstream nodes) or descendant nodes (descendant nodes) of the IAB node.
  • a downstream node or a descendant node may include a child node, a child node (or called a grandson node) of a child node, or a terminal.
  • terminal 1, terminal 2, IAB node 2, IAB node 3, IAB node 4 or IAB node 5 in FIG. 1 may be referred to as a downstream node or descendant node of IAB node 1.
  • the IAB node 4 and the IAB node 5 in FIG. 1 may be referred to as downstream nodes or descendant nodes of the IAB node 2 .
  • the terminal 1 in FIG. 1 may be referred to as a downstream node or a descendant node of the IAB node 4 .
  • the uplink data packet sent by the terminal to the donor base station may be transmitted to the donor base station through one or more IAB nodes, that is, the target node of the uplink data between the terminal and the donor base station may be the donor base station.
  • the downlink data packet sent by the host base station to the terminal can be sent to the access IAB node of the terminal through one or more IAB nodes, and then sent to the terminal by the access IAB node, that is, the target node of the downlink data between the terminal and the host base station can be It is the access IAB node.
  • path 1 there are two available paths for data transmission between terminal 1 and the donor base station, path 1: terminal 1 ⁇ IAB node 4 ⁇ IAB node 3 ⁇ IAB node 1 ⁇ donor base station.
  • Path 2 terminal 1 ⁇ IAB node 4 ⁇ IAB node 2 ⁇ IAB node 1 ⁇ host base station.
  • path 1 terminal 2 ⁇ IAB node 4 ⁇ IAB node 3 ⁇ IAB node 1 ⁇ host base station
  • path 2 terminal 2 ⁇ IAB node 4 ⁇ IAB node 2 ⁇ IAB node 1 ⁇ host base station
  • path 3 terminal 2 ⁇ IAB node 5 ⁇ IAB node 2 ⁇ IAB node 1 ⁇ host base station.
  • one or more IAB nodes may be included on a transmission path between the terminal and the donor base station.
  • Each IAB node needs to maintain a backhaul link (BL) facing the parent node. If the child node of the IAB node is a terminal, the IAB node also needs to maintain an access link (access link, AL) with the terminal. As shown in FIG. 1, the link between the IAB node 4 and the terminal 1 or the terminal 2 includes an AL. A BL is included between IAB node 4 and IAB node 2 or IAB node 3 .
  • FIG. 2 and FIG. 3 are respectively a schematic diagram of a control plane protocol stack and a schematic diagram of a user plane protocol stack in an IAB network.
  • the donor base station in Figure 2 and Figure 3 may include the functions of the host CU and the host DU (in this case, the host base station is one entity), or may include the host CU entity and the host DU entity (in this case, the host base station is divided into two entities).
  • the peer-to-peer protocol layers between the host DU and the host CU include the IP layer, layer 2 (layer2, L2), and layer 1 (layer 1, L1).
  • L1 and L2 may refer to protocol stack layers in a wired transmission (such as optical fiber transmission) network.
  • L1 may be the physical layer
  • L2 may be the data link layer.
  • Backhaul links (BL) are established between the IAB node 4 and the IAB node 3, between the IAB node 3 and the IAB node 1, and between the IAB node 1 and the host DU.
  • the peer-to-peer protocol stack at both ends of the BL may include a backhaul adaptation protocol (BAP) layer, a radio link control (radio link control, RLC), a medium access control (medium access control, MAC) layer, and Physical (PHY) layer.
  • BAP backhaul adaptation protocol
  • RLC radio link control
  • MAC medium access control
  • PHY Physical
  • the control plane protocol stack at both ends of the Uu interface includes a radio resource control (radio resource control, RRC) layer, a packet data convergence protocol (PDCP) layer, an RLC layer, a MAC layer, and a PHY layer.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC Radio Link Control
  • PHY Packet Control
  • AS access stratum
  • the control plane protocol stack of the Uu interface at the host base station side can be respectively located in the host DU and the host CU.
  • the PHY layer, the MAC layer and the RLC layer are located in the host DU
  • the RRC layer and the PDCP layer are located in the host CU.
  • an interface between the DU of the IAB node that the terminal accesses (that is, the IAB node 4 in FIG. 2 ) and the host base station, for example, it is called an F1 interface.
  • One end of the F1 interface is located at the IAB node 4, and the other end is located at the host base station.
  • the opposite end of the F1 interface of the host base station (for example, it may be the host CU) is the IAB node (specifically, it may be the DU of the IAB node), and the opposite end of the F1 interface of the IAB node (specifically, it may be the DU of the IAB node) is the host base station (specifically, it may be the DU of the IAB node).
  • the peer-to-peer control plane protocol stack at both ends of the F1 interface includes the F1 application protocol (F1 application protocol, F1AP) layer, the stream control transmission protocol (stream control transmission protocol, SCTP) layer and the IP layer.
  • the host base station may include a host CU entity and a host DU entity.
  • the control plane protocol stack of the F1 interface at the end of the host base station may be located in the host CU.
  • the host CU includes an F1AP layer, an SCTP layer, and an IP layer.
  • the control plane protocol stack of the F1 interface at the end of the host base station may also be respectively located in the host CU and the host DU.
  • the host CU includes the F1AP layer and the SCTP layer
  • the host DU includes the IP layer.
  • the terminal's RRC message is encapsulated by the access IAB node in an F1 interface application protocol (application protocol, F1AP) message for transmission.
  • F1AP application protocol
  • the terminal encapsulates the RRC message in a PDCP protocol data unit (protocol data unit, PDU), and sequentially processes the RLC layer, the MAC layer and the PHY layer and sends it to the DU of the IAB node 4.
  • PDU of IAB node 4 is sequentially processed by the PHY layer, the MAC layer and the RLC layer to obtain the PDCP PDU, and the PDCP PDU is encapsulated in the F1AP message, and then processed by the SCTP layer and the IP layer to obtain the IP packet.
  • the DU of the IAB node 4 sends the IP packet to the MT of the IAB node 4 through the internal interface.
  • the MT of the IAB node 4 sends the IP packet to the DU of the IAB node 3 after being processed by the BAP layer, the RLC layer, the MAC layer and the PHY layer in sequence.
  • the DU of the IAB node 3 is sequentially processed by the PHY layer, the MAC layer, the RLC layer and the BAP layer to obtain an IP packet.
  • the DU of IAB node 3 sends the IP packet to the MT of IAB node 3 through the internal interface, and then, the MT of IAB node 3 uses an operation similar to the MT of IAB node 4 to send the IP packet to the DU of IAB node 1. Then, the DU of IAB node 1 adopts an operation similar to that of the DU of IAB node 3 to send the IP packet to the MT of IAB node 1 . Similarly, the MT of the IAB node 1 sends the IP packet to the host DU. After the host DU parses and obtains the IP packet, it sends the IP packet to the host CU. The host CU obtains the RRC message of the terminal after processing the IP packet through the SCTP layer, the F1AP layer and the PDCP layer in sequence. The downlink direction is similar and will not be described here.
  • the user plane protocol stacks at both ends of the Uu interface between the terminal and the host base station are equivalent, including a service data adaptation protocol (service data adaptation protocol, SDAP) layer, PDCP layer, RLC layer, MAC layer, and PHY layer.
  • the protocol layer included in the Uu interface user plane protocol stack may also be referred to as the access layer (AS) of the user plane.
  • AS access layer
  • the host base station includes a host CU entity and a host DU entity
  • the user plane protocol stack of the Uu interface at the end of the host base station may be respectively located in the host DU and the host CU.
  • the PHY layer, the MAC layer and the RLC layer are located in the host DU
  • the SDAP layer and the PDCP layer are located in the host CU.
  • the peer-to-peer user plane protocol layers at both ends of the F1 interface between the DU of IAB node 4 and the host base station include the general packet radio service user plane tunneling protocol (general packet radio service tunneling protocol for the user plane, GTP-U) layer. Datagram protocol (user datagram protocol, UDP) layer and IP layer.
  • the host base station may include a host CU entity and a host DU entity.
  • the user plane protocol stack of the F1 interface at the end of the host base station may be located in the host CU.
  • the host CU includes a GTP-U layer, a UDP layer, and an IP layer.
  • the user plane protocol stack of the F1 interface at the end of the host base station can also be located in the host CU and the host DU respectively.
  • the host CU includes the GTP-U layer and the UDP layer
  • the host DU includes the IP layer.
  • the data packet of the terminal is encapsulated in the PDCP PDU (PDCP PDU) and then sent to the access IAB node after being processed by the RLC layer, the MAC layer and the PHY layer, and the access IAB node will receive the PDCP
  • the PDU is encapsulated and transmitted in the GTP-U tunnel between the access IAB node and the host CU.
  • the GTP-U tunnel is established on the F1-U interface.
  • the interface between the host DU and the host CU may also include an F1 interface.
  • the peer-to-peer control plane protocol stacks at both ends of the F1 interface include an F1AP layer, an SCTP layer and an IP layer.
  • the peer-to-peer user plane protocol stacks at both ends of the F1 interface include a GTP-U layer, a UDP layer, and an IP layer.
  • an F1 interface may also be included between the IAB node 1 or IAB node 3 and the host base station, and the description of the F1 interface may refer to the above-mentioned DU of the IAB node 4 and the host base station Description of the interface between F1.
  • the protocol stack of the terminal shown in Figure 2 or Figure 3 is the protocol stack of the MT function or MT entity of an IAB node , or the protocol stack when an IAB node acts as a terminal.
  • the MT of the IAB node When an IAB node accesses the IAB network, it can act as a terminal.
  • the MT of the IAB node has the protocol stack of the terminal.
  • the protocol stack of the terminal as shown in Fig. 2 and Fig. 3 includes RRC layer or SDAP layer, PDCP layer, RLC layer, MAC layer and PHY layer.
  • the RRC message of the IAB node is encapsulated in the F1AP message by the parent node of the IAB node for transmission.
  • the data packet of the IAB node is encapsulated in a PDCP protocol data unit (protocol data unit, PDU) and sent to the parent node of the IAB node, and the parent node of the IAB node encapsulates the received PDCP PDU in the parent node of the IAB node.
  • PDU protocol data unit
  • the IAB node can still act as an ordinary terminal.
  • the IAB node can transmit its own data packets with the host base station, such as operating, managing and maintaining network elements (operation, administration and maintenance, OAM) data packets, measurement reports, etc.
  • OAM operation, administration and maintenance
  • an IAB node may have one or more roles in the IAB network.
  • the IAB node can be used as a terminal role, or as an access IAB node role (such as the protocol stack of IAB node 4 in Figure 2 and Figure 3 ) or an intermediate IAB node role (such as the IAB node role in Figure 2 and Figure 3 ).
  • protocol stack of node 1 or IAB node 3 The IAB node can use protocol stacks corresponding to different roles for different roles.
  • the IAB node has multiple roles in the IAB network, it can have multiple sets of protocol stacks at the same time, and each set of protocol stacks can share some of the same protocol layers, such as sharing the same RLC layer, MAC layer, and PHY layer.
  • Fig. 4 is a schematic diagram of a communication scenario. As shown in Figure 4, it includes a Donor base station (Donor base station) and an IAB node.
  • the donor base station may include a donor CU (Donor CU) and at least one donor DU (Donor DU).
  • the communication interface between the donor base station and the IAB node may include an air interface (Uu interface) and an F1 interface.
  • Uu interface air interface
  • F1 interface F1 interface
  • the IP address of the IAB node can be allocated for the IAB node by the Donor DU or network management equipment.
  • the IP address of the Donor CU can also be assigned by the network management device.
  • the network management equipment may include operation, administration and maintenance (OAM), element management system (element management system, EMS), or network management system (network management system, NMS).
  • OAM operation, administration and maintenance
  • element management system element management system
  • NMS network management system
  • Fig. 5 is a schematic diagram of a dual connectivity communication scenario. As shown in Figure 5, it includes a master base station (master base station), a secondary base station (secondary base station) and an IAB node. Wherein, the host base station of the IAB node is a secondary base station.
  • the communication interface between the primary base station and the IAB node includes an air interface (Uu interface).
  • the communication interface between the secondary base station and the IAB node includes a Uu interface and an F1 interface.
  • the primary base station may also be called the primary node of the IAB node
  • the secondary base station may be called the secondary node of the IAB node.
  • Fig. 6 is a schematic diagram of a communication architecture.
  • the donor base station 1 includes a donor CU1 (Donor CU1) and a donor DU1 (Donor DU1).
  • the donor base station 2 includes a donor CU2 (Donor CU2) and a donor DU2 (Donor DU2).
  • the communication interface between the IAB node and the donor base station 1 or the donor base station 2 may include a Uu interface and/or an F1 interface.
  • Donor CU1 and Donor CU2 can communicate with each other, such as through the X2 or Xn interface.
  • Donor CU1 and Donor DU2, and between Donor CU2 and Donor DU1 can also communicate with each other, such as through the IP network.
  • downstream nodes or descendant nodes of the IAB node may also be included.
  • An upstream node of the IAB node may also be included between the IAB node and the donor base station.
  • the IAB node includes MT and DU parts (in this case, the IAB node is divided into two entities), or MT and DU functions (in this case, the IAB node is one entity).
  • the host base station includes a host CU entity and a host DU entity (in this case, the host base station is divided into two entities), or functions of the host CU and the host DU (in this case, the host base station is still a whole).
  • IAB node 2 ie, the parent node of the IAB node 3
  • the possible communication paths of the F1 interface between the IAB node and the donor base station 1 or the donor base station 2 are shown in bold curves in each scenario. It can be understood that in FIG. 7 , between the IAB node 3 and the IAB node 2 , or between the IAB node 3 and the IAB node 1 may also include other upstream nodes of the IAB node 3 . In FIG. 7 , other downstream nodes or descendant nodes of the IAB node 3 may also be included. In FIGS. 7-10 , the IAB node 1 may not exist, that is, the IAB node 3 may be directly connected to the donor base station 1 .
  • the IAB node 2 may also not exist, that is, the IAB node 3 may be directly connected to the donor base station 2 .
  • Communication scenario A in Figure 7 when the host base station in communication scenario A in Figure 7 is host base station 1 (that is, Donor CU is Donor CU1, and Donor DU is Donor DU1), there is a Uu interface between IAB node 3 and host base station 1 and F1 interface.
  • the F1 interface communication between IAB node 3 and host base station 1 needs to go through Donor DU1.
  • the IP address 1 of the IAB node 3 in the communication scenario A may be the IP address assigned by the Donor DU1 or the network management device for the IAB node 3.
  • IP address 1 of IAB node 3 and Donor DU1 belong to the same network segment or have the same network prefix.
  • the host base station in the communication scenario A in Figure 7 is the host base station 2 (that is, the Donor CU is Donor CU2, and the Donor DU is Donor DU2)
  • the host base station 2 that is, the Donor CU is Donor CU2, and the Donor DU is Donor DU2
  • the F1 interface communication between IAB node 3 and host base station 2 needs to go through Donor DU2.
  • the IP address 2 of the IAB node 3 in the communication scenario B may be the IP address assigned to the IAB node 3 by the Donor DU2 or the network management device.
  • the IP address 2 of the IAB node 3 and the Donor DU2 belong to the same network segment or have the same network prefix.
  • Communication scenario B in Figure 8 There is a Uu interface between the IAB node 3 and the donor base station 2 (including Donor CU2 and Donor DU2), and there is an F1 interface between the IAB node 3 and the donor base station 1.
  • the F1 interface communication between IAB node 3 and host base station 1 needs to go through Donor DU2.
  • the IP address 2 of the IAB node 3 in the communication scenario B may be the IP address assigned to the IAB node 3 by the Donor DU2 or the network management device. In a possible design, the IP address 2 of the IAB node 3 and the Donor DU2 belong to the same network segment or have the same network prefix.
  • Communication scenario C in FIG. 9 Uu interface exists between IAB node 3 and donor base station 1 (including Donor-CU1 and Donor-DU1), and F1 interface exists between IAB node 3 and donor base station 2.
  • F1 interface exists between IAB node 3 and donor base station 2.
  • the F1 interface communication between the IAB node and the host base station 2 needs to go through Donor DU1.
  • the IP address 1 of the IAB node 3 in the communication scenario C may be the IP address assigned by the Donor DU1 or the network management device for the IAB node 3.
  • the IP address 2 of the IAB node 3 and the Donor DU1 belong to the same network segment or have the same network prefix.
  • Communication scenario D in Figure 10 (also called a dual-connection scenario): there is a Uu interface between the IAB node 3 and the donor base station 1 (including Donor-CU1 and Donor-DU1), and there is a Uu interface between the IAB node and the donor base station 2 .
  • An F1 interface exists between the IAB node 3 and the donor base station 1 .
  • the F1 interface communication between IAB node 3 and host base station 1 can pass through Donor DU1 or Donor DU2, that is to say, host base station 1 can choose to communicate with IAB node 3 through Donor DU1 and/or Donor DU2 F1 interface communication.
  • the communication scenarios A, B, C, and D of the above-mentioned IAB node 3 are interchangeable.
  • donor base station 1 may be called a source donor base station (source donor base station, S-donor)
  • donor base station 2 may be called a target donor base station (target donor base station, T-donor).
  • S-donor can also include S-donor CU1 and S-donor DU1.
  • T-donor can also include T-donor CU2 and T-donor DU2.
  • establishing an interface may include establishing a connection and/or a bearer on the interface.
  • establishing a Uu interface may include at least one of establishing an RRC connection, establishing an SRB, and establishing a DRB.
  • Establishing an F1 interface may include establishing an F1 connection.
  • Disconnecting an interface may include disconnecting connections and/or bearers on the interface.
  • disconnecting the Uu interface may include disconnecting the RRC connection, disconnecting the SRB, and disconnecting the DRB.
  • Disconnecting the F1 interface may include disconnecting the F1 connection.
  • the IAB node 3 may also switch from communication scenario A or communication scenario B to a dual connectivity communication scenario (communication scenario D).
  • the donor base station 1 may be called a master donor base station (M-donor), and the donor base station 2 may be called a secondary donor base station (S-donor).
  • M-donor can also include M-donor CU1 and M-donor DU1.
  • S-donor can also include S-donor CU2 and S-donor DU2.
  • the dual connectivity scenarios under the current IAB architecture mainly include the following two types: dual connectivity based on redundant topology and dual connectivity based on CP-UP separation.
  • the dual connectivity based on redundant topology and the dual connectivity based on CP-UP separation are described below by taking FIG. 11 as an example.
  • Fig. 11 is a schematic diagram of another communication architecture. Similar to FIG. 6, the donor base station 1 in FIG. 11 includes a donor CU1 (Donor CU1) and a donor DU1 (Donor DU1). The donor base station 2 includes a donor CU2 (Donor CU2) and a donor DU2 (Donor DU2). IAB node 1 includes IAB MT 1 and IAB DU 1, IAB node 2 includes IAB MT 2 and IAB DU 2, IAB node 3 includes IAB MT 3 and IAB DU 3, and IAB node 4 includes IAB MT 4 and IAB DU 4. Wherein, the IAB node 2 is the access IAB node of the terminal 1, and the IAB node 4 is the access IAB node of the terminal 2.
  • the node represented by legend 1 in the figure is controlled by Donor CU 2, that is, node 3 is controlled by Donor CU 2.
  • Other nodes are controlled by Donor CU 1, that is, IAB node 1, IAB node 2 and IAB node 4 are controlled by Donor CU 1.
  • the host base station 1 is the master node MN
  • the host base station 2 is the secondary node SN
  • the MT of the IAB node 2 is connected to Donor DU1 and Donor DU2 through dual connections, respectively.
  • the MT of node 4 that is, IAB MT 4 is connected to Donor DU1 and Donor DU2 through dual connections.
  • the F1AP message of IAB node 2 and the F1AP message of IAB node 4 are terminated at Donor CU1, that is, Donor CU1 is the terminating node (F1-terminating node) of the F1AP messages of IAB node 2 and IAB node 4.
  • the topology segment composed of IAB node 3 and host base station 2 is controlled by Donor CU 2, that is, Donor CU 2 can manage IAB node 3.
  • the topology segment composed of IAB node 4, IAB node 2, IAB node 1, and host base station 1 is controlled by Donor CU 1, that is, Donor CU 1 can manage IAB node 1, IAB node 2, and IAB node 4.
  • the F1AP message may also be referred to as an F1-C message.
  • an F1 interface can be established between the DU of the IAB node accessed by the terminal and the donor base station.
  • the dual connection mode of the F1 interface of the IAB node 2 includes the F1AP message and the F1 interface data of the user plane are transmitted through the backhaul link (BL).
  • This dual connection mode is called redundant topology, and the corresponding transmission paths can be path 1 and path 2 as shown in the figure.
  • the F1AP message and the F1 interface data of the user plane can be transmitted through the backhaul link (BL) in the path 1, and the topology of the path 2 is the redundant topology of the IAB node 2 at this time.
  • the F1AP message may be transmitted through the backhaul link (BL) in path 2 through the F1 interface with the user plane, and the topology of path 1 is the redundant topology of IAB node 2 at this time.
  • This dual connection mode of the F1 interface can be called CP-UP non-separation based on redundant topology, and this mode can be realized based on the willingness of the IAB node itself.
  • the F1AP message is transmitted through the path 1, and the F1 interface data of the user plane is transmitted through the path 2.
  • the F1AP message is transmitted through the path 2, and the F1 interface data of the user plane is transmitted through the path 1.
  • This dual connection mode of the F1 interface can be called CP-UP separation based on redundant topology, and this mode can be configured by network devices in time-varying manner.
  • the termination node of the F1AP message transmitted through path 1 and/or the F1 interface data of the user plane is the same donor base station, and similarly, the termination node of the F1AP message transmitted through path 2 and/or the F1 interface data of the user plane are the same host base station.
  • the termination node is Donor CU1
  • the F1AP message and/or the F1 interface data of the user plane are finally transmitted to Donor CU1.
  • redundant topology described in the embodiment of the present application includes the above-mentioned two dual connectivity manners: CP-UP non-separation based on redundant topology and CP-UP separation based on redundant topology.
  • the dual connection mode of the F1 interface of the IAB node 4 includes the transmission of the F1AP message through the air interface (that is, the RRC message), and the F1 interface data of the user plane through the backhaul link ( BL) transmission
  • this application may refer to this connection mode as CP-UP separation of non-redundant topology, and the corresponding transmission paths may be path 3 and path 4 as shown in the figure.
  • the F1AP message can be transmitted to Donor DU 2 through the air interface between IAB MT 4 and Donor DU 2 (that is, RRC message), and then transmitted to Donor CU 1 via Donor DU 2 (as shown in path 4 in Figure 11).
  • the F1 interface data of the user plane can be transmitted to Donor DU 1 through the backhaul link (BL) between IAB MT 4 and Donor DU 1, and then transmitted from Donor DU 1 to Donor CU1 (path 3 in Figure 11) .
  • end node of the user plane F1 interface data transmitted through path 3 and the F1AP message transmitted through path 4 are the same parent base station.
  • the terminal node determines the dual connectivity mode of the F1 interface of the IAB node
  • the node's IAB host capability that is, whether it supports the host node of the IAB node
  • the dual connectivity mode that is, when the MN adds the SN for the IAB node
  • the node capability needs to be considered, or an appropriate dual connection mode should be selected based on the node capability of the SN.
  • the system information block 1 (system information block, SIB1) introduces the information element IAB-Support, if this field exists, it means that the base station supports IAB, and the base station is also regarded as a candidate base station for the IAB node. If this field does not exist, it means that the base station does not support IAB, and/or, the base station is prohibited from being used as an IAB node.
  • the terminal is UE and the base station is gNB as an example for description.
  • the MN that does not have the IAB host capability will also broadcast IAB-Support, but it cannot be the host node of the IAB node.
  • Forward the F1AP message to the SN with IAB donor capability (donor capable), and the F1 interface data (also called F1-U data) of the user plane can only be transmitted through the backhaul link between the IAB node and the SN.
  • the IAB hosting capability includes functions corresponding to the hosting base station described above, which will not be repeated here.
  • IAB-Support+non-donor capable indicating that gNB supports IAB, but does not have IAB host capability. Under this logic, gNB supports the transmission of F1AP messages through the air interface, but does not support the transmission of F1AP messages through the backhaul link.
  • IAB-Support+donor capable indicating that gNB supports IAB and also has IAB host capability. Under this logic, gNB supports the transmission of F1AP messages through the backhaul link, but does not necessarily support the transmission of F1AP messages through the air interface.
  • F1AP over NR RRC needs to enhance the Uu interface, that is, to support encapsulation of F1AP messages in RRC messages.
  • its air interface may support the transmission of F1AP messages (F1AP over NR RRC) through the air interface, or may not support the transmission of F1AP messages through the air interface (F1AP over NR RRC).
  • the embodiment of the present application provides a communication method and a communication device.
  • the base station can broadcast its own IAB host capability information to the outside, and the IAB node can access a suitable base station as the MN or SN of the IAB node according to the IAB host capability information of the base station. , and determine the dual connection mode matching the capability information of the MN and/or SN, which is beneficial to improve the stability of the communication between the IAB node and the terminal.
  • the present application can be applied to IAB networks, including independent networking (SA) IAB networks and non-standalone networking (NSA) IAB networks.
  • SA independent networking
  • NSA non-standalone networking
  • the IAB node can include the MT part and the DU part.
  • the host node of the IAB node can be further divided into two parts: Donor DU and Donor CU.
  • Donor CU can be further divided into two parts: Donor CU-CP and Donor CU-UP. .
  • FIG. 12 is a schematic diagram of an IAB network architecture 900 provided by an embodiment of the present application.
  • the IAB network architecture 900 includes UE, IAB node 1, IAB node 2, host node 1, host node 2, gNB and 5G core network (5GC).
  • UE User Equipment
  • IAB node 1 IAB node 2
  • host node 1 host node 2
  • gNB 5G core network
  • the F1 interface includes two parts: the control plane (F1-C) and the user plane (F1-U).
  • the control plane is the IAB DU and the Donor CU- It is maintained between CPs, and the user plane is maintained between IAB DU and Donor CU-UP.
  • the F1 interface is not shown in FIG. 12 .
  • the IAB node When the IAB node works in SA mode, the IAB node can be single-connected to one parent node, or dual-connected to two parent nodes, where the two parent nodes can be controlled by the same host node, or controlled by different host nodes . It is enough to establish an F1 interface between the DU part of the IAB node and a host node, and the host node with the F1 interface can be connected to the 5GC.
  • the Donor CU-CP is connected to the control plane network elements in the 5GC through the NG control plane interface (NG-C), such as the access and mobility management function (access and mobility management function, AMF).
  • Donor CU-UP is connected to user plane network elements in 5GC through NG user plane interface (NG-U), such as user plane function (UPF).
  • NG-C NG control plane interface
  • AMF access and mobility management function
  • UPF user plane function
  • the IAB node works in NSA mode, there is an NR-Uu interface between the gNB and the MT part of each node, and the NG interface can be established between the gNB and the 5GC (control plane interface NG-C and/or user plane interface NG-U) , the gNB and the host node can provide dual connectivity services for the IAB node, and the gNB can act as the primary base station of the IAB node or as the secondary base station of the IAB node.
  • 5GC control plane interface NG-C and/or user plane interface NG-U
  • IAB node 2 is the access IAB node of UE 1, and there are NR-Uu interfaces between UE 1, IAB node 1 and IAB node 2 and gNB
  • the host node 1 may serve as the MN, and the host node 2 may serve as the SN.
  • the dual connection mode of the F1 interface of the IAB node 2 may be the above-mentioned redundant topology. Or host node 1 and host node 2 switch roles, and the dual connection method adopted by IAB node 2 is similar.
  • a gNB can serve as an MN, but does not have the IAB hosting capability, and the hosting node 1 can serve as an SN.
  • the dual connection mode of the IAB node 2 can be the above-mentioned CP-UP separation based on non-redundant topology.
  • FIG. 13 is a schematic flowchart of a communication method 1300 provided by an embodiment of the present application.
  • the method 1300 is applicable to the above-mentioned IAB network architecture 900 .
  • Method 1300 includes the steps of:
  • the first network device acquires capability information of at least one second network device.
  • the wireless backhaul node, at least one second network device or network management device sends capability information of the at least one second network device to the first network device, the capability information indicating whether it has the IAB host capability and/or whether it supports the transmission of F1AP messages through the air interface , the first network device is a master node MN of a wireless backhaul node.
  • the first network device receives capability information of at least one second network device from the wireless backhaul node, at least one second network device, or network management device.
  • the first network device selects a target second network device from the at least one second network device as the secondary node SN of the wireless backhaul node according to the capability information of the at least one second network device.
  • At least one second network device is other network devices that are different from the first network device in the IAB network, and the MN can add SNs for wireless backhaul nodes in other network devices, and the capability information of the SNs Compatible with double connection mode.
  • the target second network device is the SN determined by the MN for the wireless backhaul node.
  • the wireless backhaul node in this step is the IAB node in the IAB network.
  • the wireless backhaul node may be the IAB node 2 .
  • the wireless backhaul node may also be referred to as an IAB node hereinafter.
  • the first network device configures the dual connection mode of the F1 interface of the wireless backhaul node.
  • the first network device may determine the secondary node of the wireless backhaul node (such as the IAB node) according to the acquired capability information of other network devices (such as the gNB). Based on the capability information, the first network device may determine to establish a dual-connection topology that matches the capability of the IAB host. For example, in the case where the MN or SN is the host node, the F1 interface of the IAB node adopts a dual connection mode based on CP-UP separation based on non-redundant topology. For the case where the MN and SN are host nodes, the F1 interface of the IAB node adopts a redundant topology dual connection mode.
  • the dual-connection topology structure established in this way is conducive to improving the stability of the service communication between the IAB node and the terminal and the service experience of the terminal.
  • the host node 1 in the network architecture 900 takes the role of the MN, and the host node 2 takes the role of the SN, and the first network device is the host node 1 .
  • the first network device is the host node 2 .
  • the gNB in the network architecture 900 acts as the MN, and the host node 1 acts as the SN, and the first network device is the gNB.
  • the method 1300 further includes: the first network device receiving a measurement report of at least one second network device, where the measurement report includes signal quality between the wireless backhaul node and the at least one second network device.
  • S1302 specifically includes: the first network device selects the target second network device from at least one second network device as the wireless backhaul node according to the capability information of at least one second network device and the measurement report Sn.
  • the MN may also obtain a measurement report including the signal quality between at least one second network device and the wireless backhaul node.
  • the MN may obtain a wireless backhaul node from at least one second network device.
  • the transmission node selects the second network device with good communication quality as the SN of the IAB node, which is beneficial to improve the communication quality.
  • the first network device receives capability information of at least one second network device from the wireless backhaul node; or, the first network device receives capability information of at least one second network device from the network management device ; Or, the first network device receives capability information of at least one second network device from at least one second network device.
  • the wireless backhaul node, the network management device, or at least one second network device sends the capability information of the at least one second network device to the first network device.
  • the first network device receives capability information of at least one second network device from the wireless backhaul node.
  • the gNB broadcasts the capability information
  • the MT of the IAB node receives the capability information of the gNB, and sends the capability information of the neighboring cell/gNB of the MN to the MN, so that the MN can select an appropriate SN to provide services for the IAB node.
  • the first network device receives capability information of at least one second network device from the network management device.
  • the network management device can pre-configure the support of IAB by gNBs in the network, that is, the network management device knows the capability information of each gNB in advance, and can send the capability information of each gNB's neighbor cell/gNB to each gNB in advance , in the case that the IAB node has connected to the MN, the MN can add the SN for the IAB node based on the information sent by the network management device.
  • the network management device may be an operation, administration and maintenance network element (operation, administration and maintenance, OAM).
  • the network management equipment may include an element management system (element management system, EMS) and a network management system (network management system, NMS).
  • EMS element management system
  • NMS network management system
  • the network management device may be a functional network element located in the 5G core network, or the network management device may also be a functional network element deployed in the backbone network behind the 5G core network, or the network management device may also be deployed in other locations.
  • the specific deployment location of the network management equipment is not limited.
  • the first network device receives capability information of at least one second network device from at least one second network device.
  • each gNB can exchange its own capability information, and in addition, each gNB can also exchange whether the Xn interface supports the transmission of F1AP messages through XnAP messages (F1AP over XnAP).
  • the MN can add the SN for the IAB node based on the capability information sent by the neighboring gNB and whether the corresponding Xn interface supports the transmission of the F1AP message through the XnAP message.
  • the MN when the MN selects the SN according to the above three implementation manners, it can also select the SN in combination with the capability information of the MN itself.
  • the process of determining the specific MN and SN will be described below.
  • whether the S1301 has the IAB hosting capability and/or whether it supports the transmission of F1AP messages through the air interface can also have the following combination form:
  • the capability information indicates that the gNB does not have the IAB host capability (non-donor capable). Under this instruction, gNB cannot be the host node of the IAB node, but gNB supports the transmission of F1AP messages (F1AP over NR RRC) through the air interface.
  • F1AP F1AP over NR RRC
  • the capability information indicates that the gNB has the IAB host capability, and the gNB supports the transmission of F1AP messages (F1AP over NR RRC) through the air interface.
  • the gNB can act as the host node of the IAB node, and transmit F1AP messages through the backhaul link (that is, F1AP over BH or F1AP over BAP), or transmit F1AP messages through the air interface (F1AP over NR RRC).
  • the capability information indicates that the gNB has the IAB host capability, and the gNB does not support the transmission of F1AP messages through the air interface (F1AP over NR RRC). Under the instruction, the gNB can serve as the host node of the IAB node, and transmit the F1AP message through the backhaul link.
  • the capability information indicates that the gNB supports the transmission of F1AP messages (F1AP over NR RRC) over the air interface.
  • the gNB does not have the IAB host capability (non-donor capable), or the gNB has the IAB host capability (donor capable), but the current IAB host capability of the gNB is closed or limited.
  • the Donor CU can control the Donor DU to enable the air interface capability or the IAB host capability.
  • the MN may also determine the SN in combination with the capability information of the MN, and the specific determination process is as follows.
  • Scenario 1 MN supports IAB, but does not have IAB host capability (IAB-Support+non-donor capable).
  • This scenario corresponds to the indication form of the first capability information above, that is, the MN cannot be the host node of the IAB node, but supports the transmission of F1AP messages through the air interface.
  • the IAB uses dual connectivity, it can only use CP-UP separation based on non-redundant topology, and the SN must have the IAB hosting capability and the SN is the terminal node of the F1AP message.
  • the topology structure is shown in Figure 14.
  • the IAB node 2 is the UE's access IAB node
  • the F1-C message (that is, the F1AP message) can be transmitted through the air interface between the IAB node 2 and the MN
  • the F1-U ( That is, the data of the user plane) can be transmitted through the backhaul link between the IAB node 2 and the Donor CU.
  • the MN can select an IAB node with the IAB hosting capability from at least one gNB according to the three implementation methods for obtaining capability information described above.
  • the gNB accesses as the SN, and then sends the F1AP message through the established master cell group (MCG) link and/or secondary cell group (SCG) link.
  • MCG master cell group
  • SCG secondary cell group
  • the form of sending the F1AP message includes the above-mentioned transmission through the backhaul link (F1AP over BH or F1AP over BAP), or transmission through the air interface (F1AP over NR RRC).
  • Scenario 2 The MN supports IAB, and the MN has the IAB host capability, and does not support the transmission of F1AP messages through the air interface (IAB-Support+donor capable+does not support F1AP over NR RRC).
  • This scenario corresponds to the third indication form of capability information above, that is, the MN can serve as the host node of the IAB node, but does not support the transmission of F1AP messages through the air interface.
  • the selection of SN and the selection of dual connection mode can be divided into the following scenarios:
  • Scenario 2a The MN selects a gNB that does not have the IAB host capability as the SN of the IAB node, and the SN supports the transmission of F1AP messages through the air interface.
  • the MN is the terminal node of the F1AP message
  • the dual connection mode is CP-UP based on non-redundant topology Separated, the topology is shown in Figure 15.
  • IAB node 2 is the access IAB node of UE
  • F1-C message that is, F1AP message
  • F1-U that is, user plane data
  • Scenario 2b The MN selects a gNB that has the IAB host capability and does not support the transmission of F1AP messages through the air interface as the SN of the IAB node.
  • the dual connection mode is a redundant topology, and the MN or SN is the terminal node of the IAB node.
  • the topology structure is shown in Figure 16 shown.
  • IAB node 2 is the access IAB node of UE 1
  • IAB node 4 is the access IAB node of UE 2.
  • the node shown in legend 1 in the figure is controlled by Donor CU 2, and other nodes are controlled by Donor CU 1 .
  • IAB node 1, IAB node 2, and IAB node 4 are controlled by Donor CU 1
  • node 3 is controlled by Donor CU 2
  • the F1-C message (ie, F1AP message) of IAB node 2 can pass through the IAB node Backhaul link transmission between 2 and Donor CU 1.
  • IAB node 1 is controlled by Donor CU 1
  • IAB node 2 IAB node 3 and IAB node 4 are controlled by Donor CU 2
  • the F1-C message (ie F1AP message) of IAB node 4 can pass through the IAB Backhaul link transmission between Node 4 and Donor CU 1.
  • the MN selects a gNB that has the IAB hosting capability and supports the transmission of F1AP messages through the air interface as the SN of the IAB node.
  • the dual connection method can be CP-UP separation based on non-redundant topology, and the MN is the terminal node of the F1AP message.
  • the topology is shown in Figure 15.
  • the dual connection mode can also be a redundant topology, and the MN or SN is the termination node of the IAB node.
  • the topology structure is shown in FIG. 16 .
  • the MN supports IAB, and the MN has the IAB host capability, and supports the transmission of F1AP messages through the air interface (IAB-Support+donor capable+support F1AP over NR RRC).
  • This scenario corresponds to the above-mentioned second capability information indication form, that is, the MN can serve as the host node of the IAB node, and the MN supports the transmission of F1AP messages through the air interface.
  • the selection of SN and the selection of dual connection mode can be divided into the following scenarios:
  • Scenario 3a The MN selects a gNB that does not have the IAB host capability as the SN of the IAB node, and the SN supports the transmission of F1AP messages through the air interface. At this time, the MN is the terminal node of the F1AP message, and the dual connection mode is CP-UP based on non-redundant topology Separated, the topology is shown in Figure 15.
  • Scenario 3b The MN selects a gNB that has the IAB host capability and does not support the transmission of F1AP messages through the air interface as the SN of the IAB node.
  • the dual connection mode can be CP-UP separation based on non-redundant topology, and the MN or SN is the SN of the F1AP message. Termination nodes, the topology is shown in Figure 14.
  • the dual connection mode can also be a redundant topology, and the MN or SN is the terminal node of the F1AP message, and the topology structure is shown in FIG. 16 .
  • the MN selects a gNB that has the IAB host capability and supports the transmission of F1AP messages through the air interface as the SN of the IAB node.
  • the dual connection mode can be CP-UP separation based on non-redundant topology.
  • the topology structure is shown in Figure 14 or 12. Show.
  • the dual connection mode can also be a redundant topology, and the MN or SN is the terminal node of the F1AP message, and the topology structure is shown in FIG. 16 .
  • the MN can instruct the SN to adopt the dual connection method for the IAB node.
  • the instruction method can be as follows: the MN instructs the SN to adopt a redundant topology for the IAB node 2, and use CP-UP based on a non-redundant topology for the IAB node 4 separate.
  • the MN can negotiate with the SN for the IAB node 2 the BAP routing configuration information and the quality of service (quality of service, QoS) of the topology segment controlled by the Donor CU 2, and the SN can consider that the MN indicates that the IAB node 2 adopts a redundant topology. If the MN and the SN do not negotiate configuration information for the IAB node 4, the SN may consider that the MN instructs the IAB node 4 to adopt CP-UP separation based on a non-redundant topology.
  • SN can formulate BAP routing configuration information for the topology segment controlled by Donor CU 2 for IAB node 2.
  • the SN maintains an RRC connection with the IAB MT4.
  • the IAB node can establish an F1 interface with the host node, and the F1AP message transmission form that can be used to establish the F1 interface includes through The air interface transmits F1AP messages (F1AP over NR RRC) and transmits F1AP messages in the form of backhaul (F1AP over BAP).
  • F1AP F1AP over NR RRC
  • the network may indicate that the link used by the IAB node for F1AP message transmission is the MCG link and/or the SCG link.
  • the network management device may indicate the link used by the IAB node for F1AP message transmission.
  • the MN instructs the IAB MT to use the link for F1AP message transmission through an RRC message.
  • the SN indicates the link that the IAB MT is used for F1AP message transmission through the RRC message, or the SN sends the RRC message of the SN to the MN, and the MN encapsulates the RRC message of the SN in the RRC message of the MN (for example, in a container (container) form) to IAB MT.
  • the IAB node transmits the F1AP message on the corresponding link in the form of backhaul. If the indicated link does not include the default BH RLC channel, the IAB node transmits the F1AP message on the corresponding link in the form of transmitting the F1AP message through the RRC message.
  • the default BH RLC channel is the BH RLC channel used by the wireless backhaul node to send the F1AP message for the first time. It can also be said that the default BH RLC channel is used by the IAB node to initiate the establishment request of the F1 interface. After the F1 interface is established, the IAB node can obtain channel configuration information used to transmit various service data.
  • the link for transmitting the F1AP message indicated by the above network may not include the default BH RLC channel configuration information.
  • the network may send the first indication information to the IAB node.
  • the first indication information indicates a dual connection mode of the F1 interface. That is, the first indication information may indicate the transmission form of the F1AP message.
  • the first indication information is default BH RLC channel configuration information.
  • it means that the network instructs the IAB node to transmit the F1AP message in the form of backhaul on the indicated link.
  • the IAB node selects the link that includes the default BH RLC channel configuration information, and sends the F1AP message on the corresponding link in the form of a return.
  • the IAB node 2 if the IAB node 2 receives the first indication information, the first indication information is the default BH RLC channel configuration information, and the donor base station 1 (MN) instructs the IAB node 2 to transmit the F1AP message on the MCG link , then the IAB node 2 can transmit the F1AP message in the form of backhaul on the indicated MCG link.
  • the donor base station 1 MN
  • Fig. 17 is a schematic flow chart of another communication method 1700 provided by the embodiment of the present application.
  • the method 1700 includes:
  • the target second network device sends capability information of the target second network device, where the capability information indicates whether it has an IAB hosting capability and/or supports transmission of an F1AP message through an air interface.
  • the wireless backhaul node or the first network device receives the capability information of the target second network device.
  • the wireless backhaul node sends access request information to the target second network device.
  • the target second network device receives the access request information from the wireless backhaul node, and the target second network device is the secondary node SN of the wireless backhaul node.
  • the target second network device when the MN does not determine the SN, the target second network device sends capability information of the target second network device.
  • the MN may select an SN for a wireless backhaul node in at least one second network device, and after the wireless backhaul node accesses the target second network device, the target second network device may serve as a wireless backhaul node in the role of an SN Provide services.
  • S1701 includes: the target second network device sending capability information of the target second network device to the first network device.
  • the method 1700 also includes: the target second network device sending information to the first network device whether the Xn interface between the target second network device and the first network device supports the transmission of the F1AP message through the XnAP message.
  • S1701 includes: the target second network device broadcasts capability information of the target second network device.
  • the target second network device may also send the capability information to the outside in the form of broadcast or multicast, or send the capability information to the first network device in the form of unicast.
  • the target second network device sends second indication information to the wireless backhaul node, where the second indication information is used to indicate the dual connectivity mode of the F1 interface.
  • the second indication information is default BH RLC channel configuration information
  • the default BH RLC channel is the BH RLC channel used by the wireless backhaul node to send the F1AP message for the first time.
  • the explanation of the second indication information is similar to that of the first indication information, and will not be repeated here.
  • the target second network device sends the second indication information to the wireless backhaul node through the first network device.
  • the SN may send the second indication information to the MN, and the MN may encapsulate the second indication information as a container in an RRC message of the MN and send it to the wireless backhaul node.
  • Fig. 18 is a schematic flowchart of another communication method 1800 provided by the embodiment of the present application.
  • the method 1800 includes:
  • the network device sends capability information of at least one network device to the wireless backhaul node, where the capability information is used to indicate whether it has an IAB hosting capability and/or supports transmission of an F1AP message through an air interface.
  • the wireless backhaul node receives capability information of the at least one network device.
  • the wireless backhaul node accesses a first network device based on the capability information of the at least one network device, where the first network device is a master node MN of the wireless backhaul node.
  • the network device sends first configuration information to the wireless backhaul node, where the first configuration information is used to configure the target second network device as the secondary node SN of the wireless backhaul node.
  • the wireless backhaul node receives the first configuration information.
  • the network device refers to the first network device that acts as the MN.
  • the network device sends second configuration information to the wireless backhaul node, where the second configuration information is used to configure the dual connection mode of the F1 interface of the wireless backhaul node.
  • the wireless backhaul node receives second configuration information.
  • the wireless backhaul node may select at least one network device to access the first network device as the MN of the wireless backhaul node, and access the target second network device as the wireless backhaul node according to the first configuration information.
  • the SN of the transmission node further configures the dual connectivity mode of the F1 interface of the wireless backhaul node according to the second configuration information.
  • the second configuration information may be configured by the first network device for the wireless backhaul node, or may be configured by the target second network device for the wireless backhaul node.
  • the second configuration information may be default BH RLC channel configuration information.
  • the IAB node 2 adopts the dual connection method of the redundant topology, assuming that the terminal node of the F1AP message is the host CU 1 (Donor CU 1), the uplink data packet of the IAB node 2 is transmitted to the host DU 2 (Donor DU 2) of the host base station 2 through the path 2 shown in Figure 11, and then transmitted to the Donor CU 1 by the Donor DU 2.
  • the downlink data packet of Donor CU 1 is transmitted to the host DU 2 (Donor DU 2) of the host base station 2 through the path 2 shown in Figure 11, and then transmitted to the IAB node 2 by the Donor DU 2.
  • the CU of the first network device determines a target path between the CU of the first network device and the DU of the second network device from multiple candidate paths.
  • the CU of the first network device transmits data to the DU of the second network device through the target path.
  • the CU of the first network device can choose a stable common target path for data transmission, which is conducive to improving the stability of IAB nodes and terminal data transmission sex.
  • FIG. 19 is a schematic diagram of a candidate path provided by an embodiment of the present application. It can be seen from Figure 19 that there may be three paths between Donor DU 2 and Donor CU 1 as shown in Figure 19.
  • Path 1 Donor CU 1 ⁇ Donor DU 2.
  • the data packet can add an outer layer Internet protocol (internet protocol, IP) at Donor DU 2, and the destination IP address of the outer layer IP is Donor The IP address of CU 1, the source IP address is the IP address of Donor DU 2.
  • Donor CU 1 and Donor DU 2 can be routed and transmitted through the IP network, and the data packets transmitted between the two may need to pass through multiple IP routers.
  • IP Internet protocol
  • Path 2 Donor CU 1 ⁇ Donor CU 2 ⁇ Donor DU 2
  • the data packet can add an outer layer IP at Donor DU 2
  • the destination IP address of the outer layer IP is Donor CU 1
  • the source IP address is the IP address of Donor DU 2.
  • Donor CU 2 needs to remove the outer layer IP added by Donor-DU 2, and re-add the outer layer IP.
  • the destination IP address is the IP address of Donor CU 1
  • the source The IP address is the IP address of Donor CU 2, and then Donor CU 2 can send the data packet to Donor CU 1.
  • Path 3 Donor CU 1 ⁇ Donor DU 1 ⁇ Donor DU 2
  • data packets can be forwarded between Donor DU 1 and Donor DU 2 through static or dynamic tunnels, or through IP routing.
  • the data packet can add an outer layer IP at Donor DU 2
  • the destination IP address of the outer layer IP is the IP address of Donor DU 1
  • the source IP address is the IP address of Donor DU 2.
  • Donor DU 1 removes the outer IP
  • Donor DU 1 can directly route the data packet to Donor CU 1. No other changes are required between Donor CU 1 and Donor DU 1 under this path. The following describes how to specifically determine the target path.
  • Donor CU 1 or Donor DU 2 can judge whether the path of the underlying IP of the above three paths is normal or abnormal. Possible judging methods include testing the ping value, or judging based on ICMP.
  • Donor CU 1 or Donor DU 2 can select the target path according to the IP path conditions of the three paths.
  • the path conditions of the three paths include the following combinations:
  • path 1 For uplink transmission, if the source IP address of the data packet is in the whitelist of the IP filter (IP filter) of Donor DU 2 and the IP router between Donor DU 2 and Donor CU 1, path 1 is preferred. This is because compared to path 2, path 1 needs to add the outer IP once, while path 2 needs to add the outer IP twice, which is complicated to implement.
  • IP filter IP filter
  • path 2 is preferred. This is because if the source IP address of the data packet is in the blacklist of the IP filter of the IP router between Donor DU 2 and Donor CU 1, the transmitted IP data packet may be discarded, which will cause interruption of business data, Reduce the stability of data transmission.
  • the IP filter of the IP router can be referred to as the filtering unit of the IP router, which can discard IP data packets that are not recognized or not within the permitted range.
  • path 3 is preferred. This is because, compared with IP routing, tunnel transmission is beneficial to improve the stability of data transmission.
  • path 3 is preferred, and only the IP filter of the IP router between Donor DU 2 and Donor DU 1 can filter out the target data packet In this case, choose path 2.
  • path 2 is indirect data forwarding, which needs to add two outer IPs, which is complicated to implement, while path 3 only needs to add an outer IP at Donor DU 2 once, and the data transmission between Donor DU 1 and Donor CU 1 is the same as The original data packet processing method is the same, and it can be routed directly from Donor DU 1 to Donor CU 1.
  • path 3 is simple to implement.
  • path 1 and path 3 are preferred.
  • the selection of path 1 and path 3 can refer to the content corresponding to the above combination form 3, and will not be repeated here .
  • Donor CU 1 or Donor DU 2 can select an appropriate data transmission path, which is conducive to improving the stability of data transmission between IAB nodes and terminals.
  • FIG. 20 is a schematic diagram of another topology provided by the embodiment of the present application.
  • the donor base station 1 includes a donor CU, namely Donor CU 1, and two donor DUs, namely Donor DU 1 and Donor DU 2.
  • Donor DU 1 is the source host DU
  • Donor DU 2 is the target host DU.
  • the data packets of the source host DU are switched from the link transmission of the source host DU to the link transmission of the target host DU.
  • the IAB node 2 can be connected from the source parent node (IAB node 1 in FIG. 20 ) to the target parent node (IAB node 3 in FIG. 20 ) after performing handover.
  • the IAB node 4 subordinate to the IAB node 2 and UE 1 and UE 2 can also follow the IAB node 2 to perform handover.
  • the IAB node 2 performing switching may be called a boundary IAB node (boundary IAB node), and the switching process of the above-mentioned IAB node may also be called a migration (migration) process of the IAB node, which is not limited in the embodiment of the present application.
  • the data packet from IAB node 2 is routed to Donor DU through BAP After 2, due to the IP routing between Donor DU 2 and Donor CU 1, the corresponding data packet will remove the original BAP data packet header, and the source IP address of the remaining IP data packet is the IP of IAB node 2 or IAB node 4 address, if the IP filter of Donor DU 2 cannot identify the source IP address of the data packet, then the IP filter will filter the corresponding data packet when the IP filtering function is enabled, so that the IP filter from UE 1 or UE 2 The data packets cannot reach Donor CU 1, resulting in the loss of data packets and reducing the reliability of transmission.
  • the border node can Instructions are added to the BAP header.
  • the indication information indicates that the data packet is a redirected packet (or a rerouted packet).
  • the indication information instructs Donor DU 2 to keep the data packet, that is, not to perform filtering operation on the data packet.
  • Donor DU 2 After Donor DU 2 receives the data packet that adds the indication information, it can obtain the indication information in the BAP header, so that even if the IP filter of Donor DU 2 cannot recognize the source IP address of the data packet, it can also use the indication information
  • the data packet is normally transmitted, which is conducive to improving the reliability of data transmission.
  • the correct destination BAP address is also required. Since the destination BAP address in the BAP header of the original data packet is the BAP address of Donor DU 1, if you want the original data packet to be transmitted to Donor DU 2 through IAB node 3, you need the border node IAB node 2 to rewrite the BAP address in the original data packet Header BAP routing identification (BAP routing identification, BAP routing ID), change the destination BAP address to the BAP address of Donor DU 2, so that the original data packet can be transmitted to Donor DU 2 normally, and then Donor DU 2 can be displayed in Figure 19 Data transmission occurs on path 1 or path 3 as shown. The specific path determination and data transmission process have been described above, and will not be repeated here.
  • sequence numbers of the above processes do not mean the order of execution, and the execution order of each process should be determined by its functions and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.
  • FIG. 21 is a schematic block diagram of a communication device 2100 provided by an embodiment of the present application.
  • the device 2100 includes: an acquisition module 2110 and a processing module 2120 .
  • the acquiring module 2110 is configured to: acquire capability information of at least one second network device, the capability information indicates whether it has the IAB host capability and/or supports transmission of F1AP messages through the air interface, and the first network device is a wireless backhaul node Master node MN.
  • the processing module 2120 is configured to: select a target second network device from at least one second network device as the secondary node SN of the wireless backhaul node according to the capability information of the at least one second network device, and configure the wireless backhaul node The dual connection mode of the F1 interface.
  • the dual connection mode of the F1 interface includes transmitting the F1AP message through the air interface and transmitting the F1 interface data of the user plane through the backhaul link.
  • the transmitting the F1AP message through the air interface includes: transmitting the F1AP message to the target second network device through the air interface between the wireless backhaul node and the first network device.
  • the F1AP message is transmitted to the first network device through an air interface between the wireless backhaul node and the target second network device.
  • the backhaul link is a communication link between the wireless backhaul node and the device or the target second network device.
  • the F1AP message and the F1 interface data of the user plane are transmitted through a backhaul link, where the backhaul link is a communication link between the wireless backhaul node, the device, and the target second network device.
  • the obtaining module 2110 is configured to: receive capability information of at least one second network device from at least one second network device.
  • the processing module 2120 is configured to: determine whether the Xn interface supports transmission of F1AP messages through XnAP messages, and, according to the capability information of at least one second network device and whether the Xn interface supports transmission of F1AP messages through XnAP messages, from at least one first The second network device selects the target second network device as the SN of the wireless backhaul node.
  • the obtaining module 2110 is configured to: receive capability information of at least one second network device from the wireless backhaul node; or receive capability information of at least one second network device from a network management device.
  • the acquiring module 2110 is configured to: receive a measurement report of at least one second network device, where the measurement report includes the signal quality between the wireless backhaul node and the at least one second network device.
  • the processing module 2120 is configured to: select the target second network device from at least one second network device as the SN of the wireless backhaul node according to the capability information of the at least one second network device and the measurement report.
  • the apparatus 2100 further includes a sending module 2130, configured to send first indication information to the wireless backhaul node, where the first indication information indicates the dual connection mode of the F1 interface.
  • a sending module 2130 configured to send first indication information to the wireless backhaul node, where the first indication information indicates the dual connection mode of the F1 interface.
  • the first indication information is default BH RLC channel configuration information
  • the default BH RLC channel is the BH RLC channel used by the wireless backhaul node to send the F1AP message for the first time.
  • the sending module 2130 is configured to: send the first indication information to the wireless backhaul node through the target second network device.
  • the sending module 2130 is configured to: broadcast the capability information of the first network device.
  • the acquiring module 2110 is configured to: receive access request information from the wireless backhaul node.
  • the apparatus 2100 may specifically be the first network device in the foregoing embodiments, or the functions of the first network device in the foregoing embodiments may be integrated in the apparatus 2100 .
  • the above functions can be implemented by hardware, or can be implemented by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the acquisition module 2110 may be a communication interface, such as a transceiver interface.
  • the apparatus 2100 may be configured to execute various processes and/or steps corresponding to the first network device in the foregoing method embodiments.
  • FIG. 22 shows a schematic block diagram of another communication device 2200 provided by an embodiment of the present application.
  • the device 2200 includes: a sending module 2210 and a receiving module 2220 .
  • the sending module 2210 is configured to: send capability information, the capability information indicates whether it has the IAB host capability and/or supports the transmission of F1AP messages through the air interface.
  • the receiving module 2220 is configured to: receive access request information from the wireless backhaul node.
  • the dual connection mode of the F1 interface includes transmitting the F1AP message through the air interface and transmitting the F1 interface data of the user plane through the backhaul link.
  • the transmitting the F1AP message through the air interface includes: transmitting the F1AP message to the target second network device through the air interface between the wireless backhaul node and the first network device.
  • the F1AP message is transmitted to the first network device through an air interface between the wireless backhaul node and the target second network device.
  • the backhaul link is a communication link between the wireless backhaul node and the device or the target second network device.
  • the F1AP message and the F1 interface data of the user plane are transmitted through a backhaul link, where the backhaul link is a communication link between the wireless backhaul node, the device, and the target second network device.
  • the sending module 2210 is configured to: send capability information to the first network device, and send whether the Xn interface supports transmission of F1AP messages through XnAP messages.
  • the sending module 2210 is configured to: broadcast capability information.
  • the sending module 2210 is configured to: send second indication information to the wireless backhaul node, where the second indication information is used to indicate the dual connection mode of the F1 interface.
  • the second indication information includes default BH RLC channel configuration information
  • the default BH RLC channel is the BH RLC channel used by the wireless backhaul node to send the F1AP message for the first time.
  • the sending module 2210 is configured to: send the second indication information to the wireless backhaul node through the first network device.
  • the apparatus 2200 may specifically be the target second network device in the above embodiment, or the function of the target second network device in the above embodiment may be integrated in the apparatus 2200 .
  • the above functions can be implemented by hardware, or can be implemented by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the above-mentioned sending module 2210 may be a communication interface, such as a transceiver interface.
  • Apparatus 2200 may be configured to execute various processes and/or steps corresponding to the target second network device in the foregoing method embodiments.
  • FIG. 23 shows a schematic block diagram of another communication device 2300 provided by an embodiment of the present application.
  • the device 2300 includes: an acquisition module 2310 and a processing module 2220.
  • the acquiring module 2310 is configured to: acquire capability information of at least one network device, and the capability information is used to indicate whether it has an IAB hosting capability and/or supports transmission of F1AP messages through an air interface.
  • the processing module 2220 is configured to: access the first network device based on the capability information of at least one network device.
  • the acquiring module 2310 is also configured to: receive first configuration information and second configuration information.
  • the dual connection manner includes transmitting the F1AP message through an air interface and transmitting F1 interface data of the user plane through a backhaul link.
  • the F1AP message and the F1 interface data of the user plane are transmitted through a backhaul link, and the backhaul link is a backhaul link between the wireless backhaul node, the first network device, and the target second network device road.
  • the second configuration information includes default BH RLC channel configuration information
  • the default BH RLC channel is the BH RLC channel used for sending the F1AP message for the first time.
  • the apparatus 2300 further includes a sending module 2330, configured to send the F1AP message through the backhaul link between the apparatus and the first network device or the target second network device.
  • a sending module 2330 configured to send the F1AP message through the backhaul link between the apparatus and the first network device or the target second network device.
  • the apparatus 2300 may specifically be the wireless backhaul node in the above embodiment, or the functions of the wireless backhaul node in the above embodiment may be integrated in the apparatus 2300 .
  • the above functions can be implemented by hardware, or can be implemented by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the acquisition module 2310 may be a communication interface, such as a transceiver interface.
  • the apparatus 2300 may be configured to execute various processes and/or steps corresponding to the wireless backhaul node in the foregoing method embodiments.
  • module here may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a dedicated processor, or a group processor, etc.) and memory, incorporated logic, and/or other suitable components to support the described functionality.
  • ASIC application specific integrated circuit
  • processor such as a shared processor, a dedicated processor, or a group processor, etc.
  • memory incorporated logic, and/or other suitable components to support the described functionality.
  • the device 2100, the device 2200 and the device 2300 may also be a chip or a chip system, for example: a system on chip (system on chip, SoC).
  • the acquisition module 2310 may be a transceiver circuit of the chip, which is not limited here.
  • FIG. 24 is a schematic block diagram of another data transmission device 2400 provided by an embodiment of the present application.
  • the apparatus 2400 includes a processor 2410 , a transceiver 2420 and a memory 2430 .
  • the processor 2410, the transceiver 2420 and the memory 2430 communicate with each other through an internal connection path, the memory 2430 is used to store instructions, and the processor 2410 is used to execute the instructions stored in the memory 2430 to control the transceiver 2420 to send signals and /or to receive a signal.
  • the apparatus 2400 may specifically be the first network device, the target second network device or the wireless backhaul node in the foregoing embodiments, or the first network device, the target second network device or the wireless backhaul node in the foregoing embodiments
  • the function of the device may be integrated in the apparatus 2400, and the apparatus 2400 may be used to execute various steps and/or processes corresponding to the first network device, the target second network device or the wireless backhaul node in the above method embodiments.
  • the memory 2430 may include read-only memory and random-access memory, and provides instructions and data to the processor. A portion of the memory may also include non-volatile random access memory.
  • the memory may also store device type information.
  • the processor 2410 may be used to execute instructions stored in the memory, and when the processor executes the instructions, the processor 2410 may execute the communication with the first network device, the target second network device, or the wireless backhaul node in the above method embodiments. corresponding steps and/or processes.
  • the processor may be a central processing unit (CPU), and the processor may also be other general processors, digital signal processors (DSP), application specific integrated circuits (ASIC) , Field Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • DSP digital signal processors
  • ASIC application specific integrated circuits
  • FPGA Field Programmable Gate Array
  • a general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.
  • each step of the above method can be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software.
  • the steps of the methods disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor.
  • the software module can 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, register.
  • 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, no detailed description is given here.
  • modules and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.
  • the disclosed systems, devices and methods may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the modules is only a logical function division. In actual implementation, there may be other division methods.
  • multiple modules or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or modules may be in electrical, mechanical or other forms.
  • the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, that is, they may be located in one place, or may be distributed to multiple network modules. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional module in each embodiment of the present application may be integrated into one processing module, each module may exist separately physically, or two or more modules may be integrated into one module.
  • the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or the part that contributes to the prior art 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 methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disc and other media that can store program codes. .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente demande concerne un procédé de communication et un appareil de communication, qui peuvent déterminer un mode de connectivité double d'une interface F1 et améliorer la stabilité de la communication de service. Le procédé comprend les étapes suivantes : un premier dispositif de réseau reçoit des informations de capacité d'au moins un second dispositif de réseau en provenance d'un nœud de liaison terrestre sans fil, du ou des seconds dispositifs de réseau ou d'un dispositif de gestion de réseau, les informations de capacité indiquant si le dispositif présente une capacité hôte IAB et/ou si le dispositif prend en charge la transmission d'un message F1AP au moyen d'une interface radio, et le premier dispositif de réseau étant une station de base maîtresse du nœud de liaison terrestre sans fil ; le premier dispositif de réseau détermine un second dispositif de réseau cible en tant que station de base secondaire du nœud de liaison terrestre sans fil en fonction des informations de capacité du ou des seconds dispositifs de réseau ; et le premier dispositif de réseau configure le mode de connectivité double de l'interface F1 du nœud de liaison terrestre sans fil en fonction des informations de capacité du premier dispositif de réseau et du dispositif de réseau cible.
PCT/CN2022/107829 2021-08-04 2022-07-26 Procédé de communication et appareil de communication WO2023011245A1 (fr)

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CN116056172B (zh) * 2023-03-29 2023-07-21 广州世炬网络科技有限公司 一种iab宿主节点的切换信息配置方法、装置、设备及介质
CN117156490B (zh) * 2023-10-31 2024-01-30 深圳市佳贤通信科技股份有限公司 基于cpe的5g网络回传装置及方法

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