A communication method and apparatus

Abstract

A communication method and apparatus, the method comprising: the IAB host base station determines first indication information, and then sends a first message to the eNB, the first message including a first control plane message and a first indication message, and the eNB may determine a first radio bearer according to the first indication information in the received first message, and then send a second message including the first control plane message to the IAB node through the first radio bearer. Since the first radio bearer corresponds to the type of the downlink F1AP message, that is, the eNB selects different radio bearers for different downlink F1AP message types, thereby providing effective QoS guarantee for the services of the terminal.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and in particular, to a communication method and apparatus. Background Art

[0002] The integrated access and backhaul (IAB) network technology is introduced in the fifth-generation mobile communication system (5G). Both the access link and the backhaul link in the IAB network adopt wireless transmission solutions to avoid fiber deployment, thereby reducing deployment costs and improving deployment flexibility. In the IAB network, the IAB donor gNodeB (IAB DgNB) is connected to the core network through a wired link (for example, the 5G core (5GC) in the 5G system), and then an integrated access and backhaul node (IAB node) is added between the IAB donor gNodeB and the terminal. The access link (AL) of the IAB node provides wireless access services for the terminal, and is connected to the IAB donor gNodeB through the backhaul link (BL) of the IAB node to transmit the service data of the terminal.

[0003] In the backhaul link, the radio bearers generated by the terminal (such as data radio bearer (DRB) and / or signaling radio bearer (SRB)) will be mapped onto the logical channel (LCH) for transmission. Currently, for the IAB network with non-standalone (NSA) networking, in addition to being transmitted based on the backhaul link, the F1 application protocol (F1AP) messages on the F1 interface between the IAB node and the IAB donor gNodeB can also be transmitted by the IAB donor gNodeB to the IAB node through the air interface of the long term evolution (LTE) system. However, the method of transmitting the above F1AP messages through the LTE link cannot provide effective quality of service (QoS) guarantee for the services of the terminal, that is, the QoS requirements of the terminal are difficult to ensure. Therefore, this method may cause the discontinuity of the terminal services. Summary of the Invention

[0004] The present application provides a communication method and apparatus. This method can provide QoS guarantee for a terminal and ensure the continuity of the terminal service.

[0005] In a first aspect, a communication method is provided. The method includes: in a network architecture where a first radio access device and a second radio access device are both connected to a first radio backhaul device, the first radio access device receives a first message from the second radio access device. The first message includes a first control plane message and first indication information. Then, the first radio access device determines a first radio bearer according to the first indication information. Subsequently, the first radio access device sends a second message including the first control plane message to the first radio backhaul device through the first radio bearer.

[0006] In the embodiments of the present application, the first radio access device and the second radio access device may be radio access devices of different communication systems. For example, the first radio access device is an eNB, the second radio access device is an IAB host base station, the first radio backhaul device is an IAB node, and the first control plane message may be a downlink F1AP message. The eNB may determine a first radio bearer for carrying the downlink F1AP message according to the first indication information indicated by the IAB host base station, so as to select different radio bearers for different types of downlink F1AP messages, thereby providing an effective QoS guarantee for the services of the terminal.

[0007] In a possible design, the first radio bearer is an SRB between the first radio backhaul device and the first radio access device. The first indication information may be used to indicate the identifier of the first radio bearer. In other words, the IAB host base station directly sends the first indication information for indicating the identifier of the first radio bearer to the eNB, and the eNB can directly determine the first radio bearer according to the identifier of the first radio bearer. In the embodiments of the present application, by sending the first indication information, the IAB host base station facilitates the eNB to quickly determine the first radio bearer corresponding to the F1AP message, and the signaling overhead of this method is small.

[0008] In a possible design, the first indication information may be used to indicate a first type of the first control plane message. In this case, the second radio access device also needs to receive a configuration message from the second radio access device. The configuration message includes the mapping relationship between the first type of the first control plane message and the first radio bearer. Thus, the first radio access device determines the first radio bearer corresponding to the first type of the first control plane message according to the configuration message and the first indication information. In the embodiments of the present application, by sending the first indication information, the IAB host base station facilitates the eNB to quickly determine the first radio bearer corresponding to the F1AP message.

[0009] Second aspect, a communication method is provided. The method includes: in a network architecture where a first radio access device and a second radio access device are both connected to a first radio backhaul device, the second radio access device determines first indication information, and then sends a first message including the first indication information to the first radio access device. The first indication information is used to determine a first radio bearer corresponding to the first control plane message transmitted between the first radio access device and the first radio backhaul device.

[0010] In an embodiment of the present application, the first radio access device and the second radio access device may be radio access devices of different communication systems. For example, the first radio access device is an eNB, the second radio access device is an IAB host base station, the first radio backhaul device is an IAB node, and the first control plane message may be a downlink F1AP message. The IAB host base station sends the first indication information to the eNB, and the eNB determines the first radio bearer for carrying the downlink F1AP message according to the first indication information, so as to select different radio bearers for different types of downlink F1AP messages, thereby providing effective QoS guarantee for the services of the terminal.

[0011] In a possible design, the first radio bearer is an SRB between the first radio backhaul device and the first radio access device. The first indication information may be used to indicate the identifier of the first radio bearer. In other words, the IAB host base station directly sends the first indication information for indicating the identifier of the first radio bearer to the eNB, and the eNB can directly determine the first radio bearer according to the identifier of the first radio bearer. In an embodiment of the present application, by sending the first indication information, the IAB host base station facilitates the eNB to quickly determine the first radio bearer corresponding to the F1AP message, and the signaling overhead of this method is small.

[0012] In a possible design, the first indication information may be used to indicate a first type of the first control plane message. In this case, the second radio access device also needs to receive a configuration message from the second radio access device. The configuration message includes the mapping relationship between the first type of the first control plane message and the first radio bearer. Thus, the first radio access device determines the first radio bearer corresponding to the first type of the first control plane message according to the configuration message and the first indication information. In an embodiment of the present application, by sending the first indication information, the IAB host base station facilitates the eNB to quickly determine the first radio bearer corresponding to the F1AP message.

[0013] In a third aspect, a communication method is provided. The method includes: in a network architecture where a first radio access device and a second radio access device are both connected to a first radio backhaul device, the first radio backhaul device receives a configuration message, where the configuration message includes a correspondence between a first radio bearer and a first type of control plane message. The first radio backhaul device obtains a second control plane message, where the type of the second control plane message is the first type. The first radio backhaul device determines, according to the configuration message, a first radio bearer corresponding to the first type of the second control plane message; and then sends a third message including the second control plane message to the first radio access device through the first radio bearer.

[0014] In the embodiments of the present application, the first radio access device and the second radio access device may be radio access devices of different communication systems. For example, the first radio access device is an eNB, the second radio access device is an IAB host base station, the first radio backhaul device is an IAB node, the second control plane message may be an uplink F1AP message, and the first radio bearer is an SRB between the first radio backhaul device and the first radio access device. The IAB node may determine, according to the mapping relationship in the configuration message sent by the IAB host base station, a first radio bearer for carrying an uplink F1AP message of the first type, so as to implement selecting different radio bearers for different types of uplink F1AP messages, thereby providing effective QoS guarantee for the services of the terminal.

[0015] In a possible design, the first radio backhaul device receives the configuration message from the second radio access device. Alternatively, the first radio backhaul device receives the configuration message from the first radio access device. Optionally, the configuration message in the first radio access device may be obtained from the second access device.

[0016] In a possible design, the first radio backhaul device may further receive a fifth message from a first radio access network device, where the fifth message includes a mapping relationship between a first IP address and a first radio interface. After the first radio backhaul device obtains the second control plane message, it determines that the radio interface corresponding to the first IP address in the second control plane message is the first radio interface, and the first radio interface is the radio interface between the first radio backhaul device and the first radio access network device. Then, the first radio backhaul device determines a first radio bearer on the first radio interface. In other words, when the first radio device determines to transmit an F1AP message through the first radio interface (such as an LTE radio interface), it determines the first radio bearer by using the mapping relationship in the configuration message.

[0017] Fourth aspect, a communication method is provided, which includes: in a network architecture where a first radio access device and a second radio access device are both connected to a first radio backhaul device, the first radio access device receives a third message including a second control plane message from the first radio backhaul device through a first radio bearer, and then sends a fourth message including the second control plane message to the second radio access network device, so that the first radio access device can send the second control plane message in the fourth message to the second radio access device.

[0018] In the embodiments of this application, the first radio access device and the second radio access device may be radio access devices of different communication systems. For example, the first radio access device is an eNB, the second radio access device is an IAB host base station, the first radio backhaul device is an IAB node, the second control plane message may be an uplink F1AP message, and the first radio bearer is an SRB between the first radio backhaul device and the first radio access device. The IAB node may determine a first radio bearer for carrying a first type of uplink F1AP message according to the mapping relationship in the configuration message sent by the IAB host base station, so as to select different radio bearers for different types of uplink F1AP messages, thereby providing effective QoS guarantee for the services of the terminal.

[0019] In a possible implementation, before receiving the third message, the first radio access network device sends a configuration message to the first radio backhaul device, and the configuration message includes the mapping relationship between the radio bearer and the first type of the second control plane message. Then the first radio backhaul device may determine the first radio bearer according to this mapping relationship.

[0020] In a possible implementation, the first radio access network device may obtain the configuration message from the second radio access network device in advance.

[0021] Fifth aspect, a communication method is provided, which includes: in a network architecture where a first radio access device and a second radio access device are both connected to a first radio backhaul device, the second radio access network device generates a configuration message, and the configuration message includes the corresponding relationship between the first radio bearer and the first type of the control plane message, and then the second radio access network device sends the configuration message to the first radio backhaul device or the first radio access device.

[0022] In the embodiments of the present application, after the second radio access network device sends the configuration message to the first radio backhaul device, the first radio backhaul device can determine the first radio bearer according to the mapping relationship in the configuration message, so as to select different radio bearers for different uplink F1AP message types, thereby providing effective QoS guarantee for the services of the terminal. After the second radio access network device sends the configuration message to the first radio access device, the first radio access device can forward the configuration message to the first radio backhaul device, and then the first radio backhaul device can determine the first radio bearer according to the mapping relationship in the configuration message, so as to select different radio bearers for different uplink F1AP message types, thereby providing effective QoS guarantee for the services of the terminal.

[0023] In a sixth aspect, a communication method is provided. The method includes: a first node sending a broadcast message, where the broadcast message includes indication information for indicating that the first node can support the access of IAB nodes. After the second node receives the broadcast message, it obtains the indication information from the broadcast message and determines that the first node supports the access of IAB nodes. Then the second node sends a notification message to a third node, where the notification message includes indication information that the first node or the cell served by the first node supports the access of IAB nodes. The third node determines that the first node is the secondary base station of the second node, or selects the cell served by the first node as the secondary cell of the second node.

[0024] In the embodiments of the present application, the primary serving base station of the IAB node can select a secondary base station that supports IAB access for the IAB node, avoiding the situation where the selected secondary base station cannot support the access of the IAB node, resulting in the IAB node being unable to use the secondary cell to provide backhaul services for the UE.

[0025] In a seventh aspect, embodiments of the present application provide a communication device. The communication device includes a processor coupled to a memory, where: the memory is used to store instructions; the processor is used to execute the instructions stored in the memory to execute the method in the first aspect or any possible design in the first aspect. Optionally, the communication device may further include the memory. Optionally, the communication device may further include a transceiver for supporting the communication device to send and / or receive information in the above method. Optionally, the communication device may be a first radio access device or a device in the first radio access device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and / or discrete devices.

[0026] In an eighth aspect, a communication device is provided. The device may be a first radio access device, a device in the first radio access device, or a device that can be used in conjunction with the first radio access device. In one design, the device may include modules corresponding one by one to the methods / operations / steps / actions described in each aspect. The module may be a hardware circuit, software, or a combination of a hardware circuit and software. Exemplarily, the device may include a transceiver module and a processing module, and the transceiver module and the processing module may perform the corresponding functions in any design example of the first aspect above. For the functions of the transceiver module and the processing module, reference may be made to the description in the first aspect, and details will not be repeated here.

[0027] In a ninth aspect, an embodiment of the present application provides a communication device. The communication device includes a processor coupled to a memory, where: the memory is used to store instructions; the processor is configured to execute the methods in the second aspect or any possible design in the second aspect according to the instructions stored in the memory. Optionally, the communication device may further include the memory. Optionally, the communication device may further include a transceiver for supporting the communication device to send and / or receive information in the above methods. Optionally, the communication device may be a second radio access device, a device in the second radio access device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and / or discrete devices.

[0028] In a tenth aspect, a communication device is provided. The device may be a second radio access device, a device in the second radio access device, or a device that can be used in conjunction with the second radio access device. In one design, the device may include modules corresponding one by one to the methods / operations / steps / actions described in each aspect. The module may be a hardware circuit, software, or a combination of a hardware circuit and software. Exemplarily, the device may include a transceiver module and a processing module, and the transceiver module and the processing module may perform the corresponding functions in any design example of the second aspect above. For the functions of the transceiver module and the processing module, reference may be made to the description in the second aspect, and details will not be repeated here.

[0029] In an eleventh aspect, an embodiment of the present application provides a communication device. The communication device includes a processor, and the processor is coupled to a memory, where: the memory is used to store instructions; the processor is configured to execute the methods in the above-mentioned third aspect or any possible design in the third aspect according to the instructions stored in the memory. Optionally, the communication device may further include the memory. Optionally, the communication device may further include a transceiver, which is used to support the communication device to send and / or receive information in the above-mentioned methods. Optionally, the communication device may be a first wireless backhaul device or a device in the first wireless backhaul device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and / or discrete devices.

[0030] In a twelfth aspect, a communication device is provided. The device may be a first wireless backhaul device, a device in the first wireless backhaul device, or a device that can be used in combination with the first wireless backhaul device. In one design, the device may include modules corresponding one by one to the methods / operations / steps / actions described in each aspect. The module may be a hardware circuit, software, or a combination of a hardware circuit and software. Exemplarily, the device may include a transceiver module and a processing module, and the transceiver module and the processing module may perform the corresponding functions in any design example of the above-mentioned third aspect. For the functions of the transceiver module and the processing module, reference may be made to the description in the third aspect, and details will not be repeated here.

[0031] In a thirteenth aspect, an embodiment of the present application provides a communication device. The communication device includes a processor, and the processor is coupled to a memory, where: the memory is used to store instructions; the processor is configured to execute the methods in the above-mentioned fourth aspect or any possible design in the fourth aspect according to the instructions stored in the memory. Optionally, the communication device may further include the memory. Optionally, the communication device may further include a transceiver, which is used to support the communication device to send and / or receive information in the above-mentioned methods. Optionally, the communication device may be a first wireless access device or a device in the first wireless access device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and / or discrete devices.

[0032] In a fourteenth aspect, a communication device is provided. The device may be a first radio access device, a device in the first radio access device, or a device that can be used in combination with the first radio access device. In one design, the device may include modules corresponding one by one to the methods / operations / steps / actions described in each aspect. The module may be a hardware circuit, software, or a combination of a hardware circuit and software. Exemplarily, the device may include a transceiver module and a processing module, and the transceiver module and the processing module may perform the corresponding functions in any design example of the above fourth aspect. For the functions of the transceiver module and the processing module, reference may be made to the description in the fourth aspect and will not be elaborated herein one by one.

[0033] In a fifteenth aspect, an embodiment of the present application provides a communication device. The communication device includes a processor coupled to a memory, where: the memory is used to store instructions; the processor is used to execute the methods in the above fifth aspect or any possible design in the fifth aspect according to the instructions stored in the memory. Optionally, the communication device may further include the memory. Optionally, the communication device may further include a transceiver for supporting the communication device to send and / or receive information in the above methods. Optionally, the communication device may be a second radio access device, a device in the second radio access device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and / or discrete devices.

[0034] In a sixteenth aspect, a communication device is provided. The device may be a second radio access device, a device in the second radio access device, or a device that can be used in combination with the second radio access device. In one design, the device may include modules corresponding one by one to the methods / operations / steps / actions described in the fifth aspect. The module may be a hardware circuit, software, or a combination of a hardware circuit and software. Exemplarily, the device may include a transceiver module and a processing module, and the transceiver module and the processing module may perform the corresponding functions in any design example of the above fifth aspect. For the functions of the transceiver module and the processing module, reference may be made to the description in the fifth aspect and will not be elaborated herein one by one.

[0035] In a seventeenth aspect, an embodiment of the present application provides a communication device, which includes a processor coupled to a memory, where: the memory is used to store instructions; the processor is configured to execute the instructions stored in the memory to perform the method in the sixth aspect or any possible design in the sixth aspect. Optionally, the communication device may further include the memory. Optionally, the communication device may further include a transceiver for supporting the communication device to send and / or receive information in the above method. Optionally, the communication device may be a second node or a device in the second node, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and / or discrete devices.

[0036] In an eighteenth aspect, a communication device is provided. The device may be a second node, a device in the second node, or a device that can be used in combination with the second node. In one design, the device may include modules corresponding one by one to the methods / operations / steps / actions described in the fifth aspect. The module may be a hardware circuit, software, or a combination of a hardware circuit and software. Exemplarily, the device may include a transceiver module and a processing module, and the transceiver module and the processing module may perform the corresponding functions in any design example of the sixth aspect. For the functions of the transceiver module and the processing module, reference may be made to the description in the sixth aspect, and details are not elaborated herein.

[0037] In a nineteenth aspect, an embodiment of the present application provides a device, which includes a processor for implementing the method described in the first aspect or for implementing the method described in the second aspect. The device may further include a memory for storing instructions and / or data. The memory is coupled to the processor. When the processor executes the program instructions stored in the memory, it may implement the method described in the first aspect or may implement the method described in the second aspect. The device may further include a communication interface for communicating the device with other devices. Exemplarily, the communication interface may be a transceiver, a circuit, a bus, a module, a pin, or other types of communication interfaces, and the other devices may be network devices, etc. In a possible implementation, if the device is used to implement the method described in the first aspect, the device includes:

[0038] a memory for storing program instructions;

[0039] a communication interface for receiving a first message from a second radio access device, where the first message includes a first control plane message and first indication information.

[0040] a processor for determining a first radio bearer according to the first indication information.

[0041] A communication interface is further configured to send a second message including a first control plane message to a first radio backhaul device via a first radio bearer.

[0042] In a possible implementation, if the apparatus is used to implement the method described in the second aspect above, the apparatus includes:

[0043] A memory, configured to store program instructions;

[0044] A communication interface, configured to receive a first message from a second radio access device, where the first message includes a first control plane message and first indication information.

[0045] A processor, configured to determine the first indication information.

[0046] The communication interface is further configured to send a first message including the first indication information to the first radio access device.

[0047] For the functions and beneficial effects of the processor and the communication interface, reference may be made to the description in the first aspect or the second aspect, which will not be elaborated here.

[0048] In a twentieth aspect, an embodiment of the present application provides an apparatus, where the apparatus includes a processor, configured to implement the method described in the third aspect above, or configured to implement the method described in the fourth aspect above, or configured to implement the method described in the fifth aspect above. The apparatus may further include a memory, configured to store instructions and / or data. The memory is coupled to the processor, and when the processor executes the program instructions stored in the memory, the method described in the second aspect above may be implemented, or the method described in the fourth aspect above may be implemented, or the method described in the fifth aspect above may be implemented. The apparatus may further include a communication interface, where the communication interface is used for the apparatus to communicate with other devices. Exemplarily, the communication interface may be a transceiver, a circuit, a bus, a module, a pin, or other types of communication interfaces, and the other devices may be terminal devices, etc. In a possible implementation, if the apparatus is used to implement the method described in the third aspect above, the apparatus includes:

[0049] The apparatus includes:

[0050] A memory, configured to store program instructions;

[0051] A communication interface, configured to receive a configuration message, where the configuration message includes a correspondence between a first radio bearer and a first type of control plane message;

[0052] A processor, configured to obtain a second control plane message, where the type of the second control plane message is the first type, and the first radio backhaul device determines a first radio bearer corresponding to the first type of the second control plane message according to the configuration message.

[0053] A communication interface, configured to send a third message including a second control plane message to a first radio access device via a first radio bearer.

[0054] If a device is configured to implement the method described in the fourth aspect above, the device includes:

[0055] The device includes:

[0056] A memory, configured to store program instructions.

[0057] A communication interface, configured to receive a third message including a second control plane message from a first radio backhaul device via a first radio bearer.

[0058] A processor, configured to determine a second radio access device according to the destination address of the second control plane message.

[0059] A communication interface, configured to send a fourth message including the second control plane message to a second radio access network device, so that the first radio access device can send the second control plane message in the fourth message to the second radio access device.

[0060] If a device is configured to implement the method described in the fifth aspect above, the device includes:

[0061] The device includes:

[0062] A memory, configured to store program instructions;

[0063] A processor, configured to generate a configuration message, where the configuration message includes a correspondence between a first radio bearer and a first type of control plane message.

[0064] A communication interface, configured to send the configuration message to a first radio backhaul device or a first radio access device.

[0065] For the functions and beneficial effects of the processor and the communication interface, reference may be made to the description in the third aspect, or reference may be made to the description in the fourth aspect, or reference may be made to the description in the fifth aspect, which will not be elaborated here.

[0066] In a twenty-first aspect, an embodiment of the present application further provides a computer-readable storage medium, including instructions, which when running on a computer, cause the computer to execute the method of the first aspect, any possible design of the first aspect, the second aspect, or any possible design of the second aspect, the third aspect, or any possible design of the third aspect, the fourth aspect, or any possible design of the fourth aspect, the fifth aspect, or any possible design of the fifth aspect, the sixth aspect, or any possible design of the sixth aspect.

[0067] In a twenty-second aspect, an embodiment of the present application further provides a chip system, which includes a processor and may further include a memory for implementing the methods of the first aspect, any possible design of the first aspect, the second aspect, any possible design of the second aspect, the third aspect, any possible design of the third aspect, the fourth aspect, any possible design of the fourth aspect, the fifth aspect, any possible design of the fifth aspect, the sixth aspect, or any possible design of the sixth aspect. The chip system may be composed of chips or may include chips and other discrete devices.

[0068] In a twenty-third aspect, an embodiment of the present application further provides a computer program product, including instructions that, when running on a computer, cause the computer to execute the methods of the first aspect, any possible design of the first aspect, the second aspect, any possible design of the second aspect, the third aspect, any possible design of the third aspect, the fourth aspect, any possible design of the fourth aspect, the fifth aspect, any possible design of the fifth aspect, the sixth aspect, or any possible design of the sixth aspect.

[0069] In a twenty-fourth aspect, an embodiment of the present application provides a system, where the system includes the device of the sixth aspect or the devices from the device of the sixth aspect to the device of the twentieth aspect or the device of the twentieth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figures 1A to 1B FIG. is a schematic diagram of a network architecture provided by an embodiment of the present application;

[0071] Figures 2A to 2B FIG. is another schematic diagram of a network architecture provided by an embodiment of the present application;

[0072] Figures 3(a) to 3(d) FIG. is a schematic diagram of a protocol stack structure provided by an embodiment of the present application;

[0073] Figure 4 FIG. is a schematic diagram of the process flow of the first communication method provided by an embodiment of the present application;

[0074] Figure 5 FIG. is a schematic diagram of the process flow of the second communication method provided by an embodiment of the present application;

[0075] Figure 6 FIG. is another schematic diagram of the process flow of a communication method provided by an embodiment of the present application;

[0076] Figure 7 FIG. is a schematic diagram of the structure of a communication device provided by an embodiment of the present application;

[0077] Figure 8 FIG. is a schematic diagram of the structure of a communication device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0078] The embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0079] The embodiments of the present application can be applied to various mobile communication systems, such as: new radio (NR) systems, long term evolution (LTE) systems, advanced long term evolution (LTE-A) systems, evolved long term evolution (eLTE) systems, future communication systems and other communication systems. Specifically, no limitation is made here.

[0080] To facilitate the understanding of the embodiments of the present application, first, Figure 1A the communication system shown in Figure 1A shows a schematic diagram of a communication system applicable to the communication method of the embodiments of the present application. As Figure 1A shown, the communication system includes a distributed IAB host base station, an IAB node, and a terminal-side device. Figure 1B For Figure 1A another expression form of the communication system shown in

[0081] In addition, in Figure 1A and Figure 1B the interface names between devices are also shown. For example, the radio interface between the terminal-side device and the IAB node (named NR Uu interface in the figure) and the radio interface between the IAB node and the IAB host base station (which can be called the NR wireless backhaul interface. Since this interface also communicates based on the NR Uu interface protocol, it is named NR Uu interface in the figure). These interface names are only examples and do not represent limitations on the interfaces. When the communication system version changes, the corresponding names can also be replaced by the names of the corresponding functions in other wireless communication networks.

[0082] Figure 1A The IAB network shown in Figure 1A and Figure 1B supports multi-hop networking. For example, between the IAB node and the IAB host base station shown in

[0083] Figure 1AThe IAB network shown not only supports multi-hop networking but also multi-connection networking. Between the terminal-side devices served by the IAB nodes and the IAB host, there can be at least one transmission path composed of multiple segments of links. Between the IAB nodes and the IAB host, there can also be one or more transmission paths, and each transmission path can have one or more IAB nodes. On a transmission path, each IAB node regards the neighboring node that provides access and backhaul services for it as its parent node, and correspondingly, each IAB node can be regarded as the child node of its parent node. For example, in Figure 1A and Figure 1B In the shown scenario, the parent node of the IAB node is the IAB host, and the IAB host regards the IAB node as its child node.

[0084] It should be noted that Figure 1A The IAB networking scenario shown is only exemplary. In the IAB scenario combining multi-hop and multi-connection, there may be other connection forms. For example, the present application can also be applied to the scenario of dual connection, specifically as shown in Figure 2A shown. Figure 2A shows a schematic diagram of the network architecture of an E-UTRAN and NR dual connectivity (EN-DC) system. As shown in Figure 2A shown, the communication system includes an evolved packet core (EPC) device, a base station (eNB) of the LTE system, an IAB host, IAB nodes, and terminal-side devices. Figure 2A The EN-DC networking mode shown can also be referred to as the non-standalone (NSA) networking of the IAB network. Figure 2B For Figure 2A Another expression form of the shown communication system, with the same essential meaning, will not be repeated here.

[0085] Figure 2A In, the base station of the LTE system (eNB in the figure) is the master base station (so it can also be called the Master eNB, abbreviated as MeNB), provides the LTE air interface (LTE Uu) connection for the IAB nodes, and conducts user-plane data transmission and control-plane data transmission with the core network EPC through the S1 interface. The IAB host base station is the secondary base station, provides the NR air interface (NR Uu) connection for the IAB nodes, and conducts user-plane data transmission with the core network EPC through the S1 interface. Similarly, the terminal-side devices also support dual connection. The UE connects to the master base station (eNB) through the LTE Uu interface and connects to the secondary base station (IAB node or IAB host base station) through the NR Uu interface.

[0086] It should be noted thatFigure 2A For the networking example only, the NSA networking of the IAB network also supports multi-hop IAB networking. For example, Figure 2A and Figure 2B the terminal devices in Figure 2A and Figure 2B can be connected to the IAB host base station through two or more IAB nodes, that is, the IAB nodes can be connected to the IAB host base station through multi-hop backhaul links. The NSA networking of the IAB network also supports single-hop IAB networking. For example,

[0087] In addition, it should be noted that the dual-connection scenarios applicable to this application can not only be Figure 2A and Figure 2B the EN-DC networking scenarios shown in

[0088] but also the dual-connection composed of the IAB network and the IAB network, or the connection between the IAB network and other future communication systems. The above examples do not limit the scenarios. Figure 1A and Figure 2A In

[0089] The IAB host can be an access network element with complete base station functions, or an access network element in the form of a separated centralized unit (CU) and distributed unit (DU). Among them, the CU in the IAB host can also be called the CU functional entity in the IAB host, and the DU in the IAB host can also be called the DU functional entity in the IAB host.

[0090] For ease of description, in the embodiments of this application, the CU in the IAB host and the CU functional entity in the IAB host are simply referred to as the IAB host CU (also known as IAB-donor-CU), and the DU in the IAB host and the DU functional entity in the IAB host are simply referred to as the IAB host DU (also known as IAB-donor-DU). Among them, the IAB host CU may also be in the form of separation between the control plane (CP) and the user plane (UP). For example, an IAB host CU is composed of a CU-CP (also known as IAB-donor-CU-CP) and multiple CU-UPs (also known as IAB-donor-CU-UPs). The embodiments of this application do not make any limitations in this regard.

[0091] The F1 interface involved in the embodiments of this application is the interface between the DU of the IAB node and the IAB host base station, or the interface between the DU of the IAB node and the CU of the IAB host base station, or the interface between the IAB node and the IAB host base station. The F1 interface can also be called by other names such as F1* interface. For the convenience of description, in the embodiments of this application, it can be uniformly referred to as the F1 interface, but the name is not limited.

[0092] It should be noted that the F1 interface may also be the interface between functional entities within a device. For example, for a base station including a DU and a CU, the F1 interface can be the interface between the DU and the CU within the base station.

[0093] The F1 interface involved in the embodiments of this application supports the user plane protocol and the control plane protocol. Exemplarily, as shown in FIG. 3(a), it is a schematic diagram of a protocol stack of a user plane protocol provided by the embodiments of this application. In FIG. 3(a), the link between the terminal-side device and the IAB host includes the terminal-side device, IAB node 2, IAB node 1, and IAB host as an example for description. Among them, the IAB host consists of an IAB-donor-DU and an IAB-donor-CU. The IAB-donor-CU includes a control plane functional unit (IAB-donor-CU-CP) and a user plane functional unit (IAB-donor-CU-UP) of the IAB-donor-CU. Since FIG. 3(a) is an example of a user plane protocol stack, only the IAB-donor-CU-UP part of the IAB is shown. Correspondingly, only the IAB-donor-CU-CP part is shown in the control plane protocol stack of FIG. 3(b).

[0094] In FIG. 3(a), the peer protocol layers between the terminal-side device and the IAB host include the Service Data Adaptation Protocol (SDAP) layer and the Packet Data Convergence Protocol (PDCP) layer. The peer protocols between the terminal-side device and IAB node 2 include the Radio Link Control (RLC) layer, the Medium Access Control (MAC) layer, and the Physical (PHY) layer.

[0095] On the user plane of the F1 interface between IAB node 2 and the IAB host, the peer protocols include the General Packet Radio Service (GPRS) Tunnelling Protocol User Plane (GTP-U) layer, the User Datagram Protocol (UDP) layer, and the Internet Protocol (IP) layer. Optionally, the user plane protocol layer of the F1 interface further includes the PDCP layer and / or the IP Security (IPsec) layer. In a possible implementation, the IPsec layer or the PDCP layer is located above the IP layer and below the GTP-U layer.

[0096] The peer protocol layers between IAB node 2 and IAB node 1 include the Backhaul Adaptation Protocol (BAP) layer, RLC layer, MAC layer, and PHY layer. Correspondingly, the peer protocols between IAB node 1 and the IAB host include the BAP layer, RLC layer, MAC layer, and PHY layer.

[0097] Combined with Figure 3(a), exemplarily, as shown in Figure 3(b), it is a schematic diagram of a protocol stack of a control plane protocol provided by an embodiment of the present application.

[0098] In Figure 3(b), the peer protocols between the terminal-side device and the IAB host include the radio resource control (RRC) layer and the PDCP layer. The peer protocols between the terminal-side device and IAB node 2 include the RLC layer, MAC layer, and PHY layer.

[0099] On the control plane of the F1 interface between IAB node 2 and the IAB host, the peer protocols include the F1 application protocol (F1AP) layer, stream control transport protocol (SCTP) layer, and IP layer. Optionally, the control plane protocol layer of the F1 interface further includes one or more of the PDCP layer, IPsec layer, and datagram transport layer security (DTLS) layer. In a possible implementation, the IPsec layer, PDCP layer, or DTLS layer is located above the IP layer and below the F1AP layer.

[0100] The peer protocols between IAB node 2 and IAB node 1 include the BAP layer, RLC layer, MAC layer, and PHY layer. Correspondingly, the peer protocols between IAB node 1 and the IAB host include the BAP layer, RLC layer, MAC layer, and PHY layer.

[0101] The BAP layer has at least one of the following capabilities: adding routing information (Routing information) that can be recognized by the wireless backhaul node to the data packet, performing route selection based on the routing information that can be recognized by the wireless backhaul node, adding identification information related to the quality of service (quality of service, abbreviated as QoS) requirements that can be recognized by the wireless backhaul node to the data packet, performing QoS mapping on the data packet on multiple segments of the link including the wireless backhaul node, adding data packet type indication information to the data packet, sending flow control feedback information to the node with traffic control capabilities, and sending backhaul link failure indication information to the child node. It should be noted that the name of the protocol layer with these capabilities is not necessarily the BAP layer. Those skilled in the art can understand that as long as the protocol layer has these capabilities, it can be understood as the BAP layer in the embodiments of the present application.

[0102] Among them, the routing information that can be recognized by the wireless backhaul node can be one or more of the following information: the identifier of the terminal, the identifier of the IAB node to which the terminal is connected, the identifier of the host node, the identifier of the Donor-DU, the identifier of the Donor-CU, the identifier of the transmission path, etc.

[0103] The identification information related to the QoS requirement can be the identifier of the QoS flow of the terminal (Qos flow identifier, abbreviated as QFI), the identifier of the RB of the terminal, the differentiated services code point (differentiated services code point, abbreviated as DSCP), the flow label in the packet header of the IP packet of the internet protocol version 6 (internet protocol version 6, abbreviated as IPv6), some bits in the traffic class field (such as the highest 6 bits), etc.

[0104] The QoS mapping on the multi-segment link can be as follows: In the wireless backhaul link, based on the mapping identification information carried in the data packet (for example, the identification of the RB of the terminal, the type of control plane message carried in the data packet, or the DSCP in the data packet header information, the flow label in the IPv6 packet header information, some or all of the bits in the communication classification field, the destination IP address carried in the data packet, and / or the Tunnel Endpoint Identifier (TEID), etc.), perform the mapping from the RB of the terminal to the RLC bearer or RLC channel or logical channel on the wireless backhaul link; Based on the correspondence between any two or more of the RBs, RLC bearers, RLC channels, and logical channels of the ingress link and the egress link, perform the mapping from the RB or RLC bearer or RLC channel or logical channel of the ingress link to the RB or RLC bearer or RLC channel or logical channel of the egress link.

[0105] The data packet type indication information can be used to indicate that the content encapsulated in the BAP layer includes any one or more of the following types: the user plane data of the terminal, the RRC message of the terminal, the RRC message of the IAB node, the control layer application message (such as the F1AP message) on the interface between the IAB node and the host node (or Donor-CU or CU-CP), the flow control feedback message generated by the IAB node, the header compression feedback message generated by the IAB node, the data PDU of the BAP layer, the control PDU of the BAP layer, etc.

[0106] Exemplarily, the node with traffic control capabilities can be a node that provides backhaul services for the IAB node, such as the host node, Donor-DU, Donor-CU, the parent node of the IAB node, etc. The content of the flow control feedback information can include one or more of the following information: the buffer status of the IAB node, the load level, the status of a certain link of the IAB node (such as link blockage or link resume or link quality information, etc.), the bandwidth and transmission delay of a certain link of the IAB node, the sequence number of the data packets lost by the IAB node, the sequence number of the data packets that the IAB node has successfully sent to the terminal or its child nodes, etc.

[0107] In addition, in a possible situation, the function of the BAP layer can also be extended on the function of any one layer (for example, the RLC layer, MAC layer, PDCP layer, etc.) or any multiple layers included in layer 2, without an additional protocol layer.

[0108] It should be noted that the functions and roles of the protocol layers described above can be referred to the descriptions in existing standards and will not be elaborated here.

[0109] It should be noted that the IAB node MT can have the protocol stack of the UE. The communication protocol stacks between the IAB node and the IAB host and between the IAB node and the parent node can be understood by referring to the protocol stack of the UE in FIGS. 3(a) and 3(b). In this case, the IAB node can also have an RRC layer and can establish an RRC connection with the IAB host to communicate based on the RRC layer.

[0110] Figure 3(a) and 3(b) FIG. 3 is an example diagram of the protocol diagram of the stand-alone networking architecture. For the networking scenario of ENDC, the user plane protocol stack between the IAB node and the IAB host can refer to FIG. 3(a). There are two ways for the protocol stack of the control plane protocol. One way can refer to FIG. 3(b), and another way can refer to the protocol stack diagrams shown in FIGS. 3(c) and 3(d) (that is, the F1AP message is transmitted through the LTE link). The F1AP message in FIG. 3(c) will first be encapsulated in the RRC message of the NR standard and then transmitted through the air interface and X2 interface of LTE. The difference between FIG. 3(d) and FIG. 3(c) is that there is no need for NR RRC encapsulation.

[0111] The schematic diagrams of the protocol stacks in FIGS. 3(c) and 3(d) are for facilitating the understanding of how to transmit the F1AP message of the IAB node through the X2 interface and the LTE air interface. In fact, there are other protocol layers in the LTE air interface between the IAB node and the MeNB and in the X2 interface between the MeNB and the IAB host, which are not shown in the figure. For example, below the RLC layer of the LTE air interface, there are also the peer MAC layer and the peer PHY layer between the IAB node and the MeNB node; in the X2 interface, there are also the peer link layer (Layer 2, L2) and physical layer (Layer 1, L1) of the wired connection between the MeNB and the IAB host. Optionally, in the X2 interface, there can also be a protocol layer for securing the X2AP, such as the DTLS layer or the IPsec protocol layer between the X2AP and the IP layer.

[0112] It can be understood that the protocol stack architecture in the IAB network shown in the embodiments of the present application Figures 3(a) to 3(d) is only an example. The method provided by the embodiments of the present application does not depend on this example, but through this example, the method provided by the embodiments of the present application is made easier to understand.

[0113] In the embodiments of the present application, the terminal-side device is a device with wireless transceiver function or a chip that can be disposed in the device. Among them, the device with wireless transceiver function may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, remote station, remote terminal, mobile device, user terminal, user agent or user device. In practical applications, the terminal-side device in the embodiments of the present application may be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. The embodiments of the present application do not limit the application scenarios. In the present application, the aforementioned device with wireless transceiver function and the chip that can be disposed in the device are collectively referred to as the terminal-side device.

[0114] In the embodiments of the present application, the network-side device may be a wireless access device under various systems, such as an evolved Node B (eNB), a radio network controller (RNC), a Node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (e.g., home evolved Node B, or home Node B, HNB), a baseband unit (BBU), an access point (AP) in a wireless fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a transmission and reception point (TRP or transmission point, TP), etc. It may also be a gNB or a transmission point (TRP or TP) in a 5G (NR) system, one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or a network node constituting a gNB or a transmission point, such as a baseband unit (BBU), or a DU in a central unit-distributed (CU-DU) architecture.

[0115] The network architecture and service scenarios described in the embodiments of the present application are used to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those of ordinary skill in the art know that with the evolution of the network architecture and the emergence of new service scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0116] In the embodiments of the present application, some scenarios are described by taking the IAB scenario in a wireless communication network as an example. It should be noted that the solutions in the embodiments of the present application can also be applied to other wireless communication networks, and the corresponding names can also be replaced by the corresponding function names in other wireless communication networks.

[0117] The communication method provided by the embodiments of the present application involves two scenarios: downlink F1AP message transmission and uplink F1AP message transmission. The following will describe the two scenarios separately.

[0118] Scenario 1

[0119] In the embodiment of the present application, in the NSA networking scenario, that is, both the first radio access device and the second radio access device are connected to the first radio backhaul device, the second radio access device may send a first message to the first radio access device. Since the first message includes a first control plane message and first indication information, the first radio access device may determine a first radio bearer according to the first indication information, and then send a second message including the first control plane message to the first radio backhaul device through the first radio bearer. Among them, the first control plane message may be a control plane message on the F1 interface (such as a downlink F1AP message). The first radio bearer may be an SRB between the first radio access device and the first radio backhaul device (such as SRB0 or SRB1 or SRB2 on the LTE air interface).

[0120] That is to say, the second radio access device may indicate the radio bearers corresponding to the downlink F1AP messages of different message types in the first indication information, so that the first access network device can transmit through the corresponding radio bearers when transmitting the downlink F1AP messages, providing effective QoS guarantee for the services of the terminal.

[0121] In the embodiment of the present application, the communication systems of the first radio access device and the second radio access device may be different. For example, the first radio access device may be Figure 2A the master base station (eNB) in Figure 2B and the second radio access device may be Figure 2A the secondary base station (IAB host base station) in Figure 2B and the first radio backhaul device may be

[0122] Figure 2A the IAB node (or the MT function entity of the IAB node) in Figure 2B In a possible case, if the IAB host base station is in the form of CU-DU separation, the second radio access device may be the CU function entity in the IAB host base station. In another possible case, if the CU in the IAB host base station includes a control plane (CP) function entity and a user plane (UP) function entity, the second radio access device may be the CU-CP function entity in the IAB host base station. If the second radio access device is Figure 2B the secondary base station (IAB host base station) in

[0122] then the second radio access device may be directly connected to the first radio backhaul device, or the second radio access device may first be connected to other radio backhaul devices, and then the other radio backhaul devices are connected to the first radio backhaul device. That is to say, the second radio access device supports single-hop or multi-hop connection to the first radio backhaul device. If the second radio access device is IAB-donor-CU or IAB-donor-CU-CP, then the second radio access device may be connected to the first radio backhaul device through IAB-donor-DU, or may be connected to the first radio backhaul device through IAB-donor-DU and one or more other radio backhaul devices.

[0122] The following takes the first wireless backhaul device as the Figure 2A IAB node in Figure 2A the eNB of the LTE system in Figure 2A and the second wireless access device as the Figure 4 IAB host base station in

[0123] as an example for description. It should be noted that Figure 4 the IAB host base station in Figure 4 can also be replaced by an IAB-donor-CU or an IAB-donor-CU-CP. Other cases can be deduced by analogy.

[0124] Step 401, the IAB host base station determines the first indication information.

[0125] Among them, in a possible case, the first indication information can directly indicate the identifier of the first radio bearer. In this way, the eNB can directly determine the first radio bearer according to the identifier of the first radio bearer.

[0126] In another possible case, the first indication information can also indicate the first type of the first control plane message. The first control plane message can be a control plane message on the F1 interface (for example, a downlink F1AP message). The first type of the F1AP message can be a non-UE associated message type or a UE associated message type. Optionally, the type of the F1AP message can also indicate the RRC message of the sub-node or UE served by the IAB node carried in the F1AP message, and the type of the control plane signaling radio bearer corresponding to the RRC message is SRB 0, or SRB 1, or SRB2. Therefore, the first type of the F1AP message can also be the signaling radio bearer type (SRB 0, or SRB1, or SRB2) corresponding to the RRC message carried therein.

[0127] In this case, the method further includes step 400, and the IAB host base station needs to send a configuration message to the eNB, where the configuration message includes the mapping relationship between the type of the control plane message and the radio bearer (including the mapping relationship between the first type and the first radio bearer). In this way, the eNB can use this mapping relationship to determine the corresponding first radio bearer according to the first type of the first control plane message.

[0128] Step 402, the IAB host base station sends a first message to the eNB, and the first message includes the first control plane message and the first indication message.

[0129] Specifically, the first control plane message may be the downlink F1AP message exemplified above, and the first radio bearer may be the SRB (such as SRB 1 or SRB 0 or SRB2) of the IAB node on the LTE air interface. The IAB host base station may encapsulate the first indication information and the downlink F1AP message in an X2AP message, and then the IAB host base station sends it to the eNB through the X2 interface. For example, in a possible embodiment, the IAB host base station may add the SCTP protocol header information and the IP header information of the F1-C interface to the downlink F1AP message, and then encapsulate the above information in the RRC message of the NR mode of the IAB node. After that, the RRC message of the NR mode is carried in the X2AP message, and then the X2AP message is sent to the eNB. Alternatively, in another possible embodiment, the IAB host base station may also directly carry the above information in the X2AP message after adding the SCTP protocol header information and the IP header information to the downlink F1AP message, and then send the X2AP message to the eNB. That is, in this embodiment, there is no need to perform the RRC message encapsulation of the NR mode. Among them, the F1-C interface is the control plane of the F1 interface between the IAB host base station and the IAB node. The protocol layer of the F1-C interface includes the F1AP layer, the SCTP layer, and the IP layer. The SCTP protocol header information and the IP header information of the F1-C interface are respectively the SCTP protocol layer header information and the IP layer header information of the F1-C interface. It should be noted that in this application, when the IAB host base station sends an X2AP message to the eNB, it will be sent after being processed by each layer of the control plane (X2-C) protocol stack of X2. For reference, the sending of the current X2AP message will not be elaborated on in detail.

[0130] Step 403, the eNB determines the first radio bearer according to the first indication information in the received first message.

[0131] Specifically, after receiving the X2AP message carrying the downlink F1AP message, the eNB needs to determine the corresponding radio bearer. There are various ways to determine the radio bearer. In a possible embodiment, if the first indication information is the identifier indicating the first radio bearer, in this way, the eNB can directly determine the first radio bearer according to the identifier of the first radio bearer. In another possible embodiment, if the first indication information is the first type of the first control plane message. In this way, the eNB can use this mapping relationship to determine the corresponding first radio bearer according to the first type of the first control plane message.

[0132] Step 404, the eNB sends a second message to the IAB node through the first radio bearer, and the second message includes the first control plane message.

[0133] Specifically, the eNB can encapsulate the downlink F1AP message in an RRC message of the LTE standard and send the RRC message to the IAB node (specifically, the MT of the IAB node) through the first radio bearer of the LTE link.

[0134] Among them, the RRC message of the LTE standard sent by the eNB to the IAB node may carry the downlink F1AP message with the SCTP header information and IP header information of the F1-C interface added; alternatively, the RRC message of the LTE standard sent by the eNB to the IAB node (specifically, the MT of the IAB node) may carry the RRC message of the NR standard of the IAB node, and the downlink F1AP message with the SCTP header information and IP header information of the F1-C interface added is carried in the RRC message of the NR standard.

[0135] Step 405, the IAB node receives the second message.

[0136] Specifically, the IAB node can receive the RRC message sent by the eNB and then obtain the downlink F1AP message from the RRC message.

[0137] In the embodiments of this application, in the IAB non-standalone networking architecture, if the downlink F1AP message is transmitted through the air interface of LTE, the eNB needs to obtain the downlink F1AP message and the first indication information from the IAB node, and determine the first radio bearer according to the first indication information. Since the first radio bearer corresponds to the type of the downlink F1AP message, the eNB can select different SRBs for different downlink F1AP message types, thereby providing effective QoS guarantee for the services of the terminal.

[0138] Scenario 2

[0139] In the embodiments of the present application, in the NSA networking scenario, that is, both the first radio access device and the second radio access device are connected to the first radio backhaul device. The first radio access device or the second radio access device may send a configuration message to the first radio backhaul device, and the configuration message may include the correspondence between the radio bearer and the type of control plane message (for example, including the correspondence between the first radio bearer and the first type of control plane message). When the first radio backhaul device receives the configuration message, it may determine the first radio bearer for sending the second control plane message of the first type, and then the first radio backhaul device sends a third message including the second control plane message to the first radio access device through the first radio bearer, so that the first radio access device can send the second control plane message to the second radio access device. Among them, the second control plane message may be a control plane message on the F1 interface (for example, an uplink F1AP message of the F1-C interface between the first radio backhaul device and the second radio access device). The first radio bearer is a radio bearer on the link between the first radio backhaul device and the first radio access device.

[0140] That is to say, the first radio backhaul device may determine the first radio bearer corresponding to the uplink F1AP message to be sent according to the configuration information, then send the second control plane message to the first radio access device on the first radio bearer, and then the first radio access device forwards the second control plane message to the second radio access device. So that the first radio backhaul device can select different radio bearers when transmitting different types of F1AP messages through the air interface with the first radio access device, and provide effective QoS guarantee for the services of the terminals connected to the first radio backhaul device.

[0141] In the embodiments of the present application, the communication systems of the first radio access device and the second radio access device may be different. For example, the first radio access device may be Figure 2A the main base station (eNB) in Figure 2B and the second radio access device may be Figure 2A the secondary base station (IAB host base station) in Figure 2BFor the secondary base station (IAB host base station) therein, the second radio access device can be directly connected to the first radio backhaul device, or the second radio access device can first be connected to other radio backhaul devices, and then the other radio backhaul devices are connected to the first radio backhaul device. That is to say, the second radio access device supports single-hop or multi-hop connection to the first radio backhaul device. If the second radio access device is an IAB-donor-CU or an IAB-donor-CU-CP, then the second radio access device can be connected to the first radio backhaul device through the IAB-donor-DU, or can be connected to the first radio backhaul device through the IAB-donor-DU and one or more other radio backhaul devices.

[0142] The following takes the first radio backhaul device as Figure 2A the IAB node in, and the first radio access device is Figure 2A the eNB in the LTE system in, and the second radio access device is Figure 2A the IAB host base station in as an example for description, and other situations can be inferred by analogy.

[0143] Combined with the previous description, as Figure 5 shown, it is a schematic diagram of the second communication method flow provided by the embodiment of the present application. Refer to Figure 5 , the method includes the following steps.

[0144] Step 501, the IAB node receives a configuration message.

[0145] Among them, the configuration message includes the correspondence between the radio bearer and the type of control plane message, for example, includes the correspondence between the first radio bearer and the first type of control plane message. Among them, the radio bearer in the configuration relationship can be the SRB (such as SRB1 or SRB0 or SRB2) of the air interface of LTE. The second control plane message can be the control plane message (such as the uplink F1AP message) on the F1 interface between the IAB node and the IAB host base station. The configuration message can be received from the IAB host base station or the eNB.

[0146] Among them, the type of the F1AP message can be the non-UE associated message type, or the UE associated message type. Optionally, it can also include the RRC message of the sub-node or terminal served by the IAB node carried in the F1AP message, and the control plane signaling radio bearer type corresponding to the RRC message is SRB 0, or SRB 1, or SRB2. Therefore, the first type of the F1AP message can also be the signaling radio bearer type (SRB 0, or SRB 1, or SRB2) corresponding to the RRC message carried therein.

[0147] In a possible embodiment, the IAB node may receive a configuration message from the IAB host base station. In this case, the method further includes step 500a, where the IAB host base station sends configuration information to the IAB node. The configuration information may be carried in an RRC message (the RRC message is an RRC message in the NR standard) sent by the IAB host base station to the IAB node (specifically, the MT function entity of the IAB node), or the configuration information may be carried in an F1AP message sent by the IAB host base station to the IAB node (specifically, the DU function entity of the IAB node).

[0148] In another possible embodiment, the IAB node may receive the configuration message from the eNB. In this case, the method further includes step 500b, where the eNB sends configuration information to the IAB node. The configuration message may be carried in an RRC message (the RRC message is an RRC message in the LTE standard) sent by the eNB to the IAB node (specifically, the MT function entity of the IAB node). Optionally, before sending the configuration message to the IAB node, the eNB may obtain the configuration message from the IAB host base station.

[0149] Step 502, the IAB node obtains a second control plane message, where the type of the second control plane message is the first type.

[0150] Among them, the second control plane message may be an uplink F1AP message. In a possible embodiment, the IAB node may generate the uplink F1AP message. The IAB node may determine that the type of the F1AP message is the first type.

[0151] Step 503, the IAB node determines a first radio bearer corresponding to the first type of the second control plane message according to the configuration message.

[0152] That is to say, when sending the uplink F1AP message, the IAB node may use the mapping relationship in the configuration message to determine the SRB of the LTE air interface for transmitting the F1AP message.

[0153] Step 504, the IAB node sends a third message to the eNB through the first radio bearer, and the third message includes the second control plane message.

[0154] In the embodiment of the present application, after the IAB node processes the F1AP message at the SCTP protocol layer and the IP layer of the F1-C interface, it is encapsulated in an RRC message and sent to the eNB via the LTE air interface for the eNB to forward.

[0155] Step 505, the eNB receives the third message and sends the second control plane message to the IAB host base station.

[0156] Since the destination IP address (such as the first destination IP address) is carried in the third message, the eNB can determine the IAB host base station based on this destination IP address, and then send the second control plane message (i.e., the uplink F1AP message of the IAB node) to the IAB host base station through the X2 interface.

[0157] In a possible embodiment, when the IAB node sends an uplink F1AP message, it can be transmitted through the LTE air interface (i.e., encapsulating the F1AP message in an RRC message of the LTE standard and sending it to the eNB via the LTE air interface and then forwarding it by the eNB to the IAB host), or it can be transmitted through the NR air interface (i.e., sending the F1AP message to the IAB host through the NR backhaul link). Therefore, the IAB node also needs to determine through which air interface to transmit the downlink F1AP message. For this purpose, the IAB host base station will configure at least two different IP addresses for the IAB node. This IP address can be the source IP address used when the IAB node sends an uplink F1AP message, or the destination IP address used when the IAB node sends an uplink F1AP message (i.e., the IP address of the IAB host base station). The IAB host base station configures the corresponding relationship between different IP addresses (which can be the source IP address and / or destination IP address for the IAB node to send the F1AP message) and different air interfaces (LTE air interface or NR air interface) to the IAB node. In this way, when the IAB node sends an uplink F1AP message, it can select different IP addresses (including the source IP address and / or destination IP address), and then determine whether to encapsulate the F1AP message in an RRC message and send it via the LTE air interface or send the F1AP message through the NR backhaul link according to different IP addresses. Optionally, before handing over the IP data packet encapsulating the uplink F1AP message to the lower layer, the IAB node can determine whether the lower layer protocol layer is the RRC layer of the LTE air interface or the BAP layer of the NR backhaul link according to the source IP address and / or destination IP address carried in the data packet.

[0158] The IAB host base station can send an RRC message to an IAB node (specifically, the MT of the IAB node) or send an F1AP message to an IAB node (specifically, the DU of the IAB node), and carry the correspondence between different IP addresses and different air interfaces in the RRC message or F1AP message: for example, IP address 1 corresponds to the LTE air interface, and IP address 2 corresponds to the NR air interface, where IP address 1 and IP address 2 are the source IP address or the destination IP address of the IAB node when sending an uplink F1AP message; or, IP address 1 and IP address 2 correspond to the LTE air interface, and IP address 3 and IP address 4 correspond to the NR air interface, where IP address 1 and IP address 3 are the source IP address of the IAB node when sending an uplink F1AP message (i.e., the IP address of the IAB node itself), and IP address 2 and IP address 4 are the destination IP address of the IAB node when sending an uplink F1AP message (i.e., the IP address of the IAB host base station).

[0159] For example, the IAB host base station configures IP addresses for the IAB node: IP address 1, which corresponds to the LTE air interface (or indicates that the lower protocol layer corresponding to the F1AP message is LTE RRC); and the IAB host base station configures IP addresses for the IAB node: IP address 2, which corresponds to the NR air interface (or indicates that the lower protocol layer corresponding to the F1AP message is the backhaul adaptation protocol (BAP) layer). IP address 1 and IP address 2 can be the IP address of the IAB node or the IP address of the IAB host base station. When the NR backhaul link between the IAB node and the IAB host base station is normal, the IAB node uses IP address 2 when sending an uplink F1AP message and selects the corresponding NR backhaul link for transmission; when the NR backhaul link between the IAB node and the IAB host base station is unavailable (for example, at least one wireless backhaul link experiences a radio link failure or blockage), the IAB node uses IP address 1 when sending an uplink F1AP message and selects the corresponding LTE link for transmission. For this reason, the IAB node can configure different IP addresses for the uplink F1AP messages transmitted on different paths to facilitate route selection.

[0160] For another example, the IAB host base station may configure a first pair of addresses (destination address IP address 2 and source address IP address 1) and a second pair of addresses (destination address IP address 4 and source address IP address 3) for the IAB node. Based on the above correspondence, the IP address 2 corresponds to the LTE air interface (or it is specified that the lower protocol layer corresponding to the F1AP message is LTE RRC), and the IP address 4 corresponds to the NR air interface. When the NR backhaul link between the IAB node and the IAB host base station is normal, the IAB node uses the second pair of addresses when sending an uplink F1AP message and selects the corresponding NR backhaul link for transmission; when the NR backhaul link between the IAB node and the IAB host base station is unavailable (for example, at least one wireless backhaul link experiences a radio link failure or a blockage), the IAB node uses the first pair of addresses when sending an uplink F1AP message and selects the corresponding LTE link for transmission. For this reason, the IAB node may configure different IP addresses for the uplink F1AP messages transmitted on different paths to facilitate route selection.

[0161] In the embodiments of the present application, for the uplink F1AP message, that is, the F1AP message sent by the IAB node to the IAB host base station, when the IAB node needs to transmit the F1AP message via the LTE air interface, the IAB node needs to determine the SRB of the LTE air interface according to the configuration information. The IAB node encapsulates different F1AP messages on different LTE SRBs, so that when the F1AP message of the IAB node is transmitted on the LTE air interface, the types of the F1AP messages are different, and the SRBs on the LTE air interface between the IAB node and the eNB determined by the eNB are also different. Therefore, different QoS guarantees can be provided.

[0162] For the IAB network, the present application also provides a communication method, which is used to enable the master base station (or called the master node) of the IAB node to select a suitable secondary base station (or called the secondary node) for the IAB node, as Figure 6 shown, and this method includes the following steps.

[0163] Step 601, the first node sends a broadcast message, where the broadcast message includes indication information, and the indication information is used to indicate that the first node can support the access of the IAB node.

[0164] Specifically, the first node may be an IAB host base station (specifically, it may be an IAB host DU), or a first IAB node. The first node may carry the indication information in the system information (SI) of the cell it serves. For example, the first node carries the indication information in the System Information Block (SIB) 1 it sends.

[0165] Step 602: The second node receives the broadcast message and obtains the indication information from the broadcast message.

[0166] That is to say, the second node reads the indication information sent by the first node and determines that the first node supports the access of IAB nodes.

[0167] Among them, the second node is a second IAB node. The second node accesses the cell served by the third node (i.e., the primary cell providing access service for the second node). The third node is the primary base station of the second node. For example, the third node may be an eNB in the LTE standard.

[0168] Step 603: The second node sends a notification message to the third node, where the notification message includes the indication information that the first node or the cell served by the first node supports the access of IAB nodes. Optionally, the notification message may also include the measurement result of the second node on the cell served by the first node.

[0169] Step 604: The third node determines that the first node is the secondary base station of the second node, or selects the cell served by the first node as the secondary cell of the second node.

[0170] Specifically, the third node selects the first node as the secondary base station of the second node according to the notification message received in step 603. Among them, if the first node is a first IAB node, the third node selects the IAB host base station connected to the first IAB node as the secondary base station of the second node, and selects the first IAB node as the parent node of the second node under the IAB host base station; if the first node is an IAB host base station, the third node selects the IAB host base station as the secondary base station of the second node.

[0171] In subsequent steps, the third node will perform the steps of adding a secondary base station for the second node. The specific steps can refer to the prior art and will not be elaborated in the embodiments of the present application.

[0172] Based on the embodiments provided in the present application, the primary serving base station of the IAB node can select a secondary base station that supports IAB access for the IAB node, avoiding the situation where the selected secondary base station cannot support the access of the IAB node, resulting in the IAB node being unable to use the secondary cell to provide backhaul services for the UE.

[0173] In the embodiments provided by the present application above, the methods provided by the embodiments of the present application are introduced from the perspective of the interaction between various devices. To implement each function in the methods provided by the embodiments of the present application above, the first wireless backhaul device, the first wireless access device, and the second wireless access device may include a hardware structure and / or software module, and implement the above functions in the form of a hardware structure, a software module, or a combination of a hardware structure and a software module. Whether a certain function among the above functions is executed in the form of a hardware structure, a software module, or a combination of a hardware structure and a software module depends on the specific application and design constraints of the technical solution.

[0174] With the same concept as above, as Figure 7 shown, the embodiments of the present application further provide a device 700 for implementing the functions of the first wireless access device (such as an eNB) or the second wireless access device (such as an IAB host base station) in the above method. For example, the device may be a software module or a chip system. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices. The device 700 may include: a processing unit 701 and a communication unit 702.

[0175] The division of modules in the embodiments of the present application is illustrative, and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in the various embodiments of the present application may be integrated in a processor, may exist alone physically, or two or more modules may be integrated in one module. The above integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0176] Exemplarily, when the device 700 implements Figure 4 the functions of the first wireless access device in the process shown:

[0177] The communication unit 702 is configured to receive a first message from the second wireless access device, where the first message includes a first control plane message and first indication information.

[0178] The processing unit 701 is configured to determine a first radio bearer according to the first indication information.

[0179] The communication unit 702 is further configured to send a second message to the first wireless backhaul device through the first radio bearer, where the second message includes the first control plane message.

[0180] In a possible design, the first indication information may directly indicate the identifier of the first radio bearer. In this way, the processing unit 701 may directly determine the first radio bearer according to the identifier of the first radio bearer.

[0181] In a possible design, the first indication information may also indicate the first type of the first control plane message. The communication unit 702 is further configured to send a configuration message to the first wireless backhaul device, where the configuration message includes the mapping relationship between the type of the control plane message and the radio bearer. In this way, the processing unit 701 can use this mapping relationship to determine the corresponding first radio bearer according to the first type of the first control plane message.

[0182] Exemplarily, when the device 700 implements Figure 4 the function of the second radio access device in the shown process:

[0183] The processing unit 701 is configured to determine the first indication information.

[0184] The communication unit 702 is configured to send a first message including the first indication information to the first radio access device, where the first indication information is used to determine the first radio bearer corresponding to the first control plane message transmitted between the first radio access device and the first wireless backhaul device.

[0185] In a possible design, the first indication information is used to indicate the identifier of the first radio bearer.

[0186] In a possible design, the first indication information may also indicate the first type of the first control plane message.

[0187] In a possible design, when the first indication information indicates the first type of the first control plane message, the communication unit 702 is further configured to send a configuration message to the first radio access device, where the configuration message includes the mapping relationship between the first type of the first control plane message and the first radio bearer; the configuration message is used to determine the first radio bearer corresponding to the first type of the first control plane message.

[0188] Wherein, the first control plane message is an F1 AP message on the F1 interface.

[0189] Exemplarily, when the device 700 implements Figure 5 the function of the first wireless backhaul device in the shown process:

[0190] The communication unit 702 is configured to receive a configuration message, where the configuration message includes the correspondence between the first radio bearer and the first type of the control plane message.

[0191] The processing unit 701 is configured to obtain a second control plane message and determine the first radio bearer corresponding to the first type of the second control plane message according to the configuration message.

[0192] The communication unit 702 is further configured to send a third message including the second control plane message to the first radio access device through the first radio bearer.

[0193] In a possible design, the communication unit 702 may receive the configuration message from the first radio access device or the second radio access device.

[0194] In a possible design, the communication unit 702 may receive a fifth message from the first radio access device. The fifth message includes the mapping relationship between the first IP address and the first air interface. The communication unit 702 determines the first air interface corresponding to the first IP address in the second control plane message, and then determines the first radio bearer on the first air interface corresponding to the first type of the second control plane message according to the configuration message.

[0195] Wherein, the second control plane message is an F1 AP message on the F1 interface, and is an F1 AP message sent by the first radio backhaul device to the second radio access device.

[0196] Exemplarily, when the device 700 implements the function of the first radio access device in the Figure 5 shown process:

[0197] The communication unit 702 is configured to receive a third message from the first radio backhaul device through the first radio bearer. The third message includes a second control plane message.

[0198] The processing unit 701 is configured to determine the second radio access device corresponding to the destination IP address of the second control plane message in the third message.

[0199] The communication unit 702 is configured to send a fourth message to the second radio access device. The fourth message includes a second control plane message.

[0200] In a possible design, the communication unit 702 is further configured to send a configuration message to the first radio backhaul device before receiving the third message. The configuration message includes the corresponding relationship between the first radio bearer and the first type of the control plane message, so as to facilitate the first radio backhaul device to determine the first radio bearer corresponding to the first type of the second control plane message.

[0201] In a possible design, the communication unit 702 is further configured to receive a configuration message from the second radio access device.

[0202] Exemplarily, when the device 700 implements the function of the second radio access device in the Figure 5 shown process:

[0203] The processing unit 701 is configured to generate a configuration message, which includes the mapping relationship between the first radio bearer and the first type of the control plane message.

[0204] A communication unit 702, configured to send a configuration message to a first wireless backhaul device; the configuration message is used for the first wireless backhaul device to determine a first radio bearer corresponding to a first type of a second control plane message.

[0205] Alternatively, the communication unit 702 is configured to send the configuration message to a first radio access device; the configuration message is used for determining a first radio bearer corresponding to a second control plane message transmitted between the first radio access device and the first wireless backhaul device.

[0206] Exemplarily, when the apparatus 700 implements Figure 6 the function of a third node in the shown process:

[0207] The communication unit 702 is configured to receive a notification message, where the notification message includes indication information that a first node or a cell served by the first node supports IAB node access. Optionally, the notification message may further include a measurement result of the second node on the cell served by the first node.

[0208] A processing unit 701 is configured to determine that the first node is a secondary base station of the second node, or select a cell served by the first node as a secondary cell of the second node.

[0209] Exemplarily, when the apparatus 700 implements Figure 6 the function of a first node in the shown process:

[0210] The communication unit 702 is configured to send a broadcast message, where the broadcast message includes indication information for indicating that the first node can support IAB node access.

[0211] Exemplarily, when the apparatus 700 implements Figure 6 the function of a second node in the shown process:

[0212] The communication unit 702 is configured to receive the broadcast message and obtain the indication information from the broadcast message.

[0213] The communication unit 702 is further configured to send a notification message to a third node, where the notification message includes indication information that a first node or a cell served by the first node supports IAB node access. Optionally, the notification message may further include a measurement result of the second node on the cell served by the first node.

[0214] As Figure 8 shown is an apparatus 800 provided by an embodiment of the present application. Figure 8 The shown apparatus may be Figure 7 a hardware circuit implementation manner of the shown apparatus. The communication apparatus is applicable to Figures 4 to 5In the flowchart shown, the functions of the first radio access device, the second radio access device, or the first radio backhaul device in the above method embodiments are executed. For ease of explanation, Figure 8 only the main components of the communication device are shown.

[0215] Figure 8 The device 800 shown includes at least one processor 820, which is used to implement any Figures 4 to 6 method provided in the embodiments of the present application.

[0216] The device 800 may further include at least one memory 830, which is used to store program instructions and / or data. The memory 830 is coupled to the processor 820. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, which can be electrical, mechanical or other forms, and is used for information interaction between devices, units or modules. The processor 820 may cooperate with the memory 830. The processor 820 may execute the program instructions stored in the memory 830. At least one of the at least one memories may be included in the processor.

[0217] The device 800 may further include a communication interface 810, which is used to communicate with other devices through a transmission medium, so that the devices in the device 800 can communicate with other devices. In the embodiments of the present application, the communication interface may be a transceiver, a circuit, a bus, a module or other types of communication interfaces. In the embodiments of the present application, the transceiver may be an independent receiver, an independent transmitter, a transceiver integrating transceiver functions, or an interface circuit. The processor 820 uses the communication interface 810 to send and receive data, and is used to implement Figures 4 to 6 the methods executed by the first radio access device, the second radio access device, or the first radio backhaul device in the corresponding embodiments. For details, reference may be made to the previous description, and details will not be repeated here.

[0218] Based on the same concept as the above method embodiments, the embodiments of the present application also provide a computer-readable storage medium, on which some instructions are stored. When these instructions are called and executed by a computer, the computer can complete the methods involved in any possible design of the above method embodiments and method embodiments. In the embodiments of the present application, the computer-readable storage medium is not limited. For example, it may be RAM (random-access memory), ROM (read-only memory), etc.

[0219] Based on the same concept as the above method embodiments, the present application also provides a computer program product, which can complete the methods involved in the method embodiments and any possible design of the above method embodiments when called and executed by a computer.

[0220] Based on the same concept as the above method embodiments, the present application also provides a chip, which may include a processor and an interface circuit, and is used to implement the methods involved in any possible implementation manner of the above method embodiments and method embodiments. Among them, "coupling" means that two components are directly or indirectly combined with each other, and this combination can be fixed or movable, and this combination can allow liquid, electricity, electrical signals or other types of signals to communicate between the two components.

[0221] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) containing computer-usable program code.

[0222] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in one or more processes in the flowchart and / or one or more blocks in the block diagram.

[0223] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured product including an instruction device, and the instruction device implements the functions specified in one or more processes in the flowchart and / or one or more blocks in the block diagram.

[0224] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these changes and modifications.

Claims

1. A communication method, characterized in that, Applied to the first radio access device or the chip in the first radio access device, the method includes: Receiving a first message from a second radio access device, the first message including a first control plane message and first indication information, the first indication information being used to indicate the identifier of a first radio bearer, or the first indication information being used to indicate a first type of the first control plane message; Determining a first radio bearer according to the first indication information; Sending a second message to a first radio backhaul device through the first radio bearer, the second message including the first control plane message; Wherein, both the first radio access device and the second radio access device are connected to the first radio backhaul device; Further includes: Receiving a configuration message from the second radio access device, the configuration message including a mapping relationship between the first type of the first control plane message and the first radio bearer; Determining a first radio bearer according to the first indication information includes: Determining a first radio bearer corresponding to the first type of the first control plane message according to the configuration message and the first indication information.

2. The method according to claim 1, wherein The first radio bearer is a signaling radio bearer SRB between the first radio backhaul device and the first radio access device.

3. The method according to claim 1 or 2, characterized in that, The first control plane message is an F1 application layer protocol AP message on an F1 interface, and the F1 interface is an interface between the first radio backhaul device and the second radio access device.

4. The method according to claim 1 or 2, characterized in that, The communication systems of the first radio access device and the second radio access device are different.

5. The method according to claim 1 or 2, characterized in that, The first radio access device is a base station of a Long Term Evolution (LTE) system, and the second radio access device is an Integrated Access and Backhaul (IAB) host base station.

6. A communication method, characterized in that, Applied to the second radio access device or the chip in the second radio access device, the method includes: Determining first indication information; Sending a first message including the first indication information to a first radio access device, the first indication information being used for the first radio access device to determine a first radio bearer corresponding to a first control plane message transmitted between the first radio access device and a first radio backhaul device, the first indication information being used to indicate the identifier of the first radio bearer, or the first indication information being used to indicate a first type of the first control plane message; Wherein, both the first radio access device and the second radio access device are connected to the first radio backhaul device; Further includes: Sending a configuration message to the first radio access device, the configuration message including a mapping relationship between the first type of the first control plane message and the first radio bearer; the configuration message is used for the first radio access device to determine a first radio bearer corresponding to the first type of the first control plane message.

7. The method according to claim 6, characterized in that, The first radio bearer is a signaling radio bearer SRB between the first radio backhaul device and the first radio access device.

8. The method according to claim 6 or 7, characterized in that, The first control plane message is an F1 application layer protocol AP message on an F1 interface, and the F1 interface is an interface between the first radio backhaul device and the second radio access device.

9. The method according to claim 6 or 7, characterized in that The communication systems of the first wireless access device and the second wireless access device are different.

10. The method according to claim 6 or 7, characterized in that, The first wireless access device is a base station of a Long-Term Evolution (LTE) system, and the second wireless access device is an Integrated Access and Backhaul (IAB) host base station.

11. A communication device, characterized in that, It includes at least one processor, which is connected to a memory. The at least one processor is configured to read and execute a program stored in the memory, so that the device performs the method according to any one of claims 1-5, or 6-10.

12. A chip, characterized in that, The chip includes a processor, which is coupled to a memory. The processor is configured to read and execute program instructions stored in the memory to implement the method according to any one of claims 1-10.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions. When the instructions are run on a computer, the computer is caused to perform the method according to any one of claims 1-10.

14. A computer program product, characterized in that, When the computer program product is called by a computer, the computer is caused to perform the method according to any one of claims 1-10.

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