Communication method and device

Abstract

The invention provides a communication method and device which can be applied to the field of communication. The method comprises the steps that when a first host node receives first information requesting to provide a first service function for terminal equipment, the first host node can send first configuration information to a first IAB DU according to the first information and send second configuration information to a second IAB DU included in an access IAB node of the terminal equipment, the first IAB node comprises the first IAB DU and a first IAB MT, and the first IAB DU comprises the first IAB MT and the second IAB MT comprises the first IAB DU and the second IAB MT. The first IAB MT has a first service function; in addition, the first host node can also send RRC reconfiguration information to the first IAB MT and the terminal device to align PDCP configuration information and / or SDAP configuration information of the terminal device side and the first IAB MT side, communication between the terminal device and the first IAB MT with the first service function can be achieved, and therefore the first IAB MT can provide the first service function for the terminal device.

Description

Technical Field

[0001] The present application relates to the field of communications, and more specifically, to a communication method and device. Background Art

[0002] In an integrated access and backhaul (IAB) network, an IAB node can provide wireless access services for terminal devices, and the service data of the terminal devices can be transmitted by the IAB node connecting to the IAB donor through a wireless backhaul link; wherein the IAB donor can also be called a donor node or a donor gNodeB (DgNB), and the IAB node consists of a mobile terminal (MT) part and a distributed unit (DU) part. The IAB node can be connected to the core network through the IAB host, for example, the IAB host can be connected to the core network element serving the terminal device and provide wireless backhaul function for the IAB node.

[0003] Service-based architecture (SBA) is an important feature of the fifth generation (5G) core network architecture. It divides network functions into reusable service function modules, and different service function modules use a unified lightweight interface to communicate. In response to the evolution of the sixth generation (6G) network architecture, most equipment vendors and operators have proposed the demand for radio access network (RAN) service-oriented architecture, and introduced the service-oriented architecture concept on the core network side into the next-generation RAN architecture design to achieve rapid launch and flexible deployment of new service functions on the RAN side and simplify the network. However, the current RAN functions are highly coupled, the algorithm integration between RAN functions is high, and there is uncertainty in integration, making it difficult to integrate service function modules on the RAN side. Summary of the invention

[0004] The present application provides a communication method and apparatus, which can integrate service functions on the IAB MT side, and enable the IAB MT with service functions to provide service functions for terminal devices.

[0005] In a first aspect, a communication method is provided, which can be executed by a first host node or a chip or chip system in the first host node. The method includes: the first host node receives first information, the first information is used to request to provide a first service function for a terminal device; the first host node sends first configuration information to a first access backhaul integrated IAB distributed unit DU according to the first information, the first configuration information indicates the correspondence between a first data radio bearer DRB identifier and a first backhaul adaptation protocol BAP routing identifier, the first IAB node includes the first IAB DU and a first IAB mobile terminal MT, and the first IAB MT has the first service function; the first host node sends second configuration information to a second IAB DU according to the first information, the second configuration information indicates the correspondence between a second DRB identifier and a second BAP routing identifier, the second IAB node includes the second IAB DU, and the second IAB node is an access IAB node of the terminal device; the first host node sends first RRC reconfiguration information to the first IAB MT and the terminal device according to the first information, respectively, and the first RRC reconfiguration information indicates PDCP configuration information and / or SDAP configuration information.

[0006] Based on the above technical solution, the service function is integrated on the IAB MT side. When the first host node receives the first information requesting to provide the first service function for the terminal device, the first host node can send the first configuration information to the first IAB DU according to the first information, and send the second configuration information to the second IAB DU included in the access IAB node of the terminal device, wherein the first IAB node includes the first IAB DU and the first IAB MT, and the first IAB MT has the first service function; the first host node can also send RRC reconfiguration information to the first IAB MT and the terminal device respectively according to the first information to align the PDCP configuration information and / or SDAP configuration information on the terminal device side and the first IAB MT side, so as to realize the communication between the terminal device and the first IAB MT having the first service function, so as to realize the first IAB MT providing the first service function for the terminal device.

[0007] In combination with the first aspect, in certain implementations of the first aspect, the method further includes: the first host node determines, based on the first information, a first data transmission path between the terminal device and the first IAB MT and first service quality requirement information corresponding to the first service function within the topology of the first host node; the first host node determines, based on the first data transmission path and the first service quality requirement information, the first configuration information and the second configuration information.

[0008] In combination with the first aspect, in some implementations of the first aspect, the method further includes: the first host node sends second information to the first IAB MT based on the first information, the second information being used to request that the first service function be provided for the terminal device; the first host node receives third information from the first IAB MT, the third information being used to indicate that the first IAB MT is allowed to provide the first service function for the terminal device. Based on this implementation, the first host node may determine that the first IAB MT is allowed to provide the first service function for the terminal device based on the third information.

[0009] In combination with the first aspect, in some implementations of the first aspect, the first host node receives the first information, including: the first host node receives the first information from the terminal device.

[0010] In combination with the first aspect, in some implementations of the first aspect, the method further includes: the first host node sends first service function list information to the terminal device, the first service function list information indicating at least one first service function supported by the IAB MT included in at least one IAB node served by the first host node, wherein the at least one first service function includes the first service function, and the at least one IAB node includes the first IAB node. Based on this implementation, the terminal device can know which service functions can be provided within the topology of the first host node.

[0011] In combination with the first aspect, in some implementations of the first aspect, the first host node receives the first information, including: the first host node receives the first information from the access and mobility management function AMF.

[0012] In combination with the first aspect, in some implementations of the first aspect, the method further includes: the first host node receives registration request information from at least one IAB MT, the registration request information is used to indicate at least one second service function requested to be registered by the IAB MT, and the at least one IAB MT includes the first IAB MT; the first host node sends registration request feedback information to the at least one IAB MT respectively, and the registration request feedback information is used to indicate the second service function authorized for registration and / or the second service function refused to be authorized for registration among the at least one second service function requested to be registered by the IAB MT, wherein the at least one first service function includes the second service function authorized for registration.

[0013] In combination with the first aspect, in some implementations of the first aspect, the method also includes: the first host node sends the registration request information to the AMF; and the first host node receives the registration request feedback information from the AMF.

[0014] In combination with the first aspect, in certain implementations of the first aspect, the registration request information includes at least one item of identification information, service type information, or service status information corresponding to the at least one second service function; the registration request feedback information includes identification information corresponding to the second service function for the authorized registration, and / or identification information corresponding to the second service function for the rejected authorization registration.

[0015] In combination with the first aspect, in some implementations of the first aspect, the registration request feedback information includes reason information for refusing authorization corresponding to the second service function for which authorization registration is refused.

[0016] In a second aspect, a communication method is provided, which can be executed by a first host node or a chip or chip system in the first host node. The method includes: a first host node receives first information, the first information is used to request to provide a first service function for a terminal device; the first host node sends third configuration information to a second IAB DU according to the first information, the third configuration information indicates a correspondence between a third bearer DRB identifier and a third BAP routing identifier, the second IAB node includes the second IAB DU, the second IAB node is an access IAB node of the terminal device, and at least one IAB node served by the first host node includes the second IAB node; the first host node sends management request information to the second host node, the management request information includes third service quality requirement information corresponding to the first service function in the topology of the second host node, first identification information allocated by the first host node to a first IAB MT, transmission network layer information corresponding to the DU included in the first host node, and information about the third BAP routing identifier, the first IAB node served by the second host node includes the first IAB MT, and the first IAB MT has the first service function; the first host node receives management request response information from the second host node, the management request response information includes second identification information allocated by the second host node to the first IAB MT, transmission network layer information corresponding to the DU included in the second host node, and information about the first IAB The first host node also includes the first IAB DU; the first host node sends second RRC reconfiguration information to the terminal device according to the management request response information, and the second RRC reconfiguration information indicates PDCP configuration information and / or SDAP configuration information, the PDCP configuration information corresponding to the terminal device is the same as the PDCP configuration information corresponding to the first IAB MT, and the SDAP configuration information corresponding to the terminal device is the same as the SDAP configuration information corresponding to the first IAB MT.

[0017] Based on the above technical solution, the service function is integrated on the IAB MT side. When the first host node receives the first information requesting to provide the first service function for the terminal device, the first host node can send the third configuration information to the second IABDU according to the first information. The second IAB node served by the first host node includes the second IAB DU, and the second IAB node is the access IAB node of the terminal device; the first host node can send the management request information to the second host node according to the first information. The first IAB MT included in the first IAB node served by the second host node has the first service function; the second host node can send the fourth configuration information to the first IAB DU according to the received management request information. The first IAB node also includes the first IAB DU; the second host node can also send RRC reconfiguration information to the first IAB MT; after receiving the management request response information from the second host node, the first host node can also send the RRC reconfiguration information to the terminal device to align the PDCP configuration information and / or SDAP configuration information on the terminal device side and the first IAB MT side, so as to realize the communication between the terminal device and the first IAB MT having the first service function, so as to realize the first IAB MT providing the first service function for the terminal device.

[0018] In combination with the second aspect, in certain implementations of the second aspect, the method also includes: the first host node determines, based on the first information, a second data transmission path between the terminal device and the first host node, second service quality requirement information corresponding to the first service function within the topology of the first host node, and the third service quality requirement information; the first host node determines the third configuration information based on the second data transmission path, the second service quality requirement information and the third service quality requirement information.

[0019] In combination with the second aspect, in certain implementations of the second aspect, the method further includes: the first host node sends service request information to the second host node based on the first information, and the service request information is used to request that the first service function be provided to the terminal device; the first host node receives service request response information from the second host node, and the service request response information is used to indicate that the first IAB MT allows the first service function to be provided to the terminal device.

[0020] Based on this implementation, the first host node may determine, according to the service request response information, that the first IAB MT is allowed to provide the first service function for the terminal device.

[0021] In combination with the second aspect, in some implementations of the second aspect, the method further includes: the first host node sends first indication information to the second host node, the first indication information indicating at least one first service function supported by the IAB MT included in at least one IAB node served by the first host node; the first host node receives second indication information from the second host node, the second indication information indicating at least one third service function supported by the IAB MT included in at least one IAB node served by the second host node, wherein the at least one third service function includes the first service function, and the at least one IAB node served by the second host node includes the first IAB node. Based on this implementation, the first host node and the second host node can learn the service functions supported in their respective topologies through interaction.

[0022] In combination with the second aspect, in some implementations of the second aspect, the first host node receives the first information, including: the first host node receives the first information from the terminal device.

[0023] In combination with the second aspect, in some implementations of the second aspect, the method further includes: the first host node sends second service function list information to the terminal device, the second service function list information indicating at least one first service function supported by the IAB MT included in at least one IAB node served by the first host node and at least one third service function supported by the IAB MT included in at least one IAB node served by the second host node. Based on this implementation, the terminal device can know which service functions can be provided by the terminal device through the first host node.

[0024] In combination with the second aspect, in some implementations of the second aspect, the first host node receives the first information, including: the first host node receives the first information from the AMF.

[0025] According to a third aspect, a communication method is provided, which can be executed by a second host node or a chip or chip system in the second host node. The method includes: a second host node receives management request information from a first host node, the management request information includes third service quality requirement information corresponding to a first service function in the topology of the second host node, first identification information allocated by the first host node to a first IAB MT, transmission network layer information corresponding to a DU included in the first host node, and information of a third BAP routing identifier corresponding to a second IAB DU served by the first host node, a first IAB node served by the second host node includes the first IAB MT, the first IAB MT has the first service function, wherein the second IAB node served by the first host node includes the second IAB DU, and the second IAB node is an access IAB node of a terminal device; the second host node sends fourth configuration information to the first IAB DU according to the management request information, the fourth configuration information indicates a corresponding relationship between a fourth DRB identifier and a fourth BAP routing identifier, and the first IAB node also includes the first IAB DU; the second host node sends first RRC reconfiguration information to the first IAB MT according to the management request information, the first RRC reconfiguration information indicates PDCP configuration information and / or SDAP configuration information, and the first IAB The PDCP configuration information corresponding to the MT is the same as the PDCP configuration information corresponding to the terminal device, and the SDAP configuration information corresponding to the first IAB MT is the same as the SDAP configuration information corresponding to the terminal device; the second host node sends management request response information to the first host node, and the management request response information includes the second identification information allocated by the second host node to the first IAB MT, the transmission network layer information corresponding to the DU included in the second host node, and the fourth BAP routing identification information.

[0026] The method provided in the third aspect is a method on the second host node side corresponding to the second aspect, and its beneficial effects can refer to the second aspect.

[0027] In combination with the third aspect, in certain implementations of the third aspect, the method further includes: the second host node determines, based on the management request information, a third data transmission path and the third service quality requirement information between the second host node and the first IAB MT; and the second host node determines, based on the third data transmission path and the third service quality requirement information, the fourth configuration information.

[0028] In combination with the third aspect, in some implementations of the third aspect, the method also includes: the second host node receives service request information from the first host node, the service request information being used to request that the first service function be provided to the terminal device; the second host node sends fourth information to the first IAB MT based on the service request information, the fourth information being used to request the first IAB MT to provide the first service function to the terminal device; the second host node receives fifth information from the first IAB MT, the fifth information being used to indicate that the first IAB MT allows the first service function to be provided to the terminal device; the second host node sends service request response information to the first host node based on the fifth information, the service request response information being used to indicate that the first IAB MT allows the first service function to be provided to the terminal device.

[0029] In combination with the third aspect, in certain implementations of the third aspect, the method also includes: the second host node receives first indication information from the second host node, the first indication information indicating at least one first service function supported by the IAB MT included in at least one IAB node served by the first host node; the second host node receives second indication information sent to the second host node, the second indication information indicating at least one third service function supported by the IAB MT included in at least one IAB node served by the second host node, wherein the at least one third service function includes the first service function, and the at least one IAB node served by the second host node includes the first IAB node.

[0030] In a fourth aspect, a communication device is provided, which can be applied to the first host node described in the first aspect, and the device includes: a transceiver unit, used to implement the receiving and sending functions of the method described in the first aspect; a processing unit, used to implement the processing functions of the method described in the first aspect, such as determining the first configuration information and the second configuration information.

[0031] In the fifth aspect, a communication device is provided, which can be applied to the first host node described in the second aspect, and the device includes: a transceiver unit, used to implement the receiving and sending functions of the method described in the second aspect; a processing unit, used to implement the processing functions such as determining the third configuration information of the method described in the second aspect.

[0032] In the sixth aspect, a communication device is provided, which can be applied to the second host node described in the third aspect, and the device includes: a transceiver unit, used to implement the receiving and sending functions of the method described in the third aspect; a processing unit, used to implement the processing functions such as determining the fourth configuration information of the method described in the third aspect.

[0033] In the seventh aspect, a communication device is provided, comprising: a processor and a transceiver, wherein the transceiver is used to receive computer code or instructions and transmit them to the processor, and the processor runs the computer code or instructions so that the method in any possible implementation of the first aspect to the third aspect or the first aspect to the third aspect is executed.

[0034] In an eighth aspect, a communication system is provided, comprising: the first host node in the method described in the second aspect and other communication devices that communicate with the first host node; the second host node in the method described in the third aspect and other communication devices that communicate with the second host node.

[0035] In the ninth aspect, a computer-readable storage medium is provided, wherein the computer-readable medium stores a computer program; when the computer program runs on a computer, the method in the above-mentioned first to third aspects and any possible implementation of the first to third aspects is executed.

[0036] In a tenth aspect, a computer program product is provided, comprising a computer program, which, when executed, enables the communication method in the above-mentioned first to third aspects and any possible implementation method of the first to third aspects to be implemented.

[0037] The solutions provided in the fourth to tenth aspects are used to implement or cooperate with the methods provided in the first to third aspects, and therefore can achieve the same or corresponding beneficial effects as the first to third aspects, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of a wireless relay scenario.

[0039] Figure 2 A schematic diagram of a control plane protocol stack in an IAB network.

[0040] Figure 3 A schematic diagram of a user plane protocol stack in an IAB network.

[0041] Figure 4 A schematic diagram of an IAB network architecture applicable to an embodiment of the present application.

[0042] Figure 5 It is a schematic diagram of a service-oriented architecture based on IAB MT according to an embodiment of the present application.

[0043] Figure 6 A schematic diagram of a user plane protocol stack from a terminal device to an IAB MT according to an embodiment of the present application.

[0044] Figure 7A schematic flow chart of the communication method according to an embodiment of the present application.

[0045] Figure 8 A schematic diagram of an IAB node within the topology of a first host node.

[0046] Fig. 9 A schematic flow chart of an example of a communication method provided in an embodiment of the present application.

[0047] Fig.10 Another schematic flow chart of the communication method according to an embodiment of the present application.

[0048] Fig.11 A schematic diagram of an IAB node within a topology of a first host node and a second host node.

[0049] Fig.12 A schematic flow chart of another example of a communication method provided in an embodiment of the present application.

[0050] Figures 13 to 16 A schematic block diagram of a communication device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0052] The embodiments of the present application can be applied to various communication systems, such as wireless local area network (WLAN), narrowband Internet of Things (NB-IoT), global system for mobile communications (GSM), enhanced data rate for GSM evolution (EDGE), wideband code division multiple access (WCDMA), code division multiple access 2000 (CDMA2000), time division-synchronization code division multiple access (TD-SCDMA), long term evolution (LTE), satellite communication, sidelink (SL), fourth generation (4G) system, 5G system, 6G system, or new communication systems that will appear in the future.

[0053] The terminal devices involved in the embodiments of the present application may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem. The terminal device may be a subscriber unit, user equipment (UE), cellular phone, smart phone, wireless data card, personal digital assistant (PDA) computer, tablet computer, wireless modem (modulator demodulator, modem), laptop computer, machine type communication (MTC) terminal, and wireless terminal in self-driving, etc.

[0054] Exemplarily, the network device may be an access network device, 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 evolved NodeB (or home Node B, HNB), a baseband unit (BBU), a device that performs a base station function in device to device (D2D), an access point (AP) in a wireless fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (TP) or a transmission and reception point (TRP), etc. It may also be a gNB or a transmission point (e.g., TRP or TP) in NR, one or a group (including multiple) antenna panels of a base station in NR, or a network node constituting a gNB or a transmission point, such as a baseband unit (BBU) or a distributed unit (TRP). The network equipment may also be a vehicle-mounted device, a wearable device, a network device in a 6G network, a network device in a future evolved PLMN network, or a network device deployed on a satellite, without limitation. In addition, according to the size of the service coverage area provided, the base station (BS) can be divided into a macro base station for providing macro cells, a micro base station for providing pico cells, and a femto base station, a relay station, and an access point for providing femto cells. With the continuous evolution of wireless communication technology, future base stations may also adopt other names.

[0055] To facilitate the understanding of the embodiments of the present application, the technical solutions related to the embodiments of the present application are briefly introduced below.

[0056] Compared with 4G, 5G has put forward more stringent requirements for various network performance indicators. For example, the capacity is increased by 1,000 times, the coverage requirements are wider, ultra-high reliability, ultra-low latency, etc. On the one hand, considering the rich high-frequency carrier frequency resources, in order to meet the ultra-high capacity requirements of 5G, it is becoming more and more popular to use high-frequency small base stations to form networks in hot spots; the propagation characteristics of high-frequency carriers are poor, the signal attenuation is serious after being blocked, and the coverage range is not wide, so a large number of small base stations need to be deployed densely. Correspondingly, the cost of providing optical fiber backhaul for these densely deployed small base stations is very high, and the construction is difficult, so an economical and convenient backhaul solution is needed; on the other hand, from the perspective of wide coverage requirements, in some remote areas, network coverage is provided, and the deployment of optical fiber is difficult and costly, and flexible and convenient access and backhaul solutions need to be designed. IAB technology provides ideas for solving the above two problems. Both the access link and the backhaul link (BL) adopt wireless transmission solutions, which reduces the deployment of optical fiber.

[0057] In an IAB network, a relay node (RN) or an IAB node can provide wireless access services for terminal devices. The service data of the terminal device can be transmitted by the IAB node connected to the IAB host through a wireless backhaul link; in this application, an IAB donor may also be referred to as a host node or a host base station. An IAB node consists of an MT part and a DU part, wherein when an IAB node faces its parent node, the IAB node can be regarded as a terminal device, and at this time, the IAB node plays the role of an MT, wherein the parent node may be an IAB host; when an IAB node faces its child node, the IAB node can be regarded as a network device, and at this time, the IAB node plays the role of a DU, wherein the child node may be another IAB node or a terminal device. A host base station may be an access network element with complete base station functions, or an access network element in the form of a centralized unit (CU) and a distributed unit (DU) separated. For ease of expression, the centralized unit of the host base station can be called donor CU or CU for short, and the distributed unit of the host base station can be called donor DU or DU for short, where the donor CU may also be in a form where the control plane (CP) and the user plane (UP) are separated. For example, the donor CU may be composed of one CU-CP and one or more CU-UPs.

[0058] The IAB node can be connected to the core network via the IAB host. For example, the IAB host can be connected to the core network element serving the terminal device and provide wireless backhaul function for the IAB node. For example, in the standalone (SA) 5G architecture, the IAB node is connected to the 5G core (5G core, 5GC) via the IAB host. In the dual connectivity (DC) or multi-connectivity (MC) 5G architecture, the IAB node can be connected to the evolved packet core (EPC) via the evolved NodeB (eNB), or it can be connected to the 5G core via the IAB host.

[0059] In an IAB network, one or more IAB nodes may be included on a transmission path between a terminal device and an IAB host. Each IAB node needs to maintain a wireless backhaul link with the parent node and a wireless link with the child node. If the child node of an IAB node is a terminal device, the wireless link between the IAB node and the child node (terminal device) is a wireless access link; if the child node of an IAB node is another IAB node, the wireless link between the IAB node and the child node (other IAB node) is a wireless backhaul link.

[0060] Figure 1 This is a schematic diagram of a wireless relay scenario. In the path "terminal device 1→IAB node 4→IAB node 3→IAB node 1→IAB host", terminal device 1 accesses IAB node 4 via a wireless access link, IAB node 4 is connected to IAB node 3 via a wireless backhaul link, IAB node 3 is connected to IAB node 1 via a wireless backhaul link, and IAB node 1 is connected to the IAB host via a wireless backhaul link.

[0061] The access IAB node in the embodiment of the present application refers to the IAB node to which the terminal device accesses, and the intermediate IAB node refers to the IAB node that provides wireless backhaul services for the terminal device or IAB node. Figure 1 In the path "terminal device 1→IAB node 4→IAB node 3→IAB node 1→IAB host", IAB node 4 is an access IAB node, and IAB node 3 and IAB node 1 are intermediate IAB nodes. It should be noted that an IAB node is an access IAB node for a terminal device accessing the IAB node, and is an intermediate IAB node for a terminal device accessing other IAB nodes. Therefore, whether an IAB node is an access IAB node or an intermediate IAB node is not fixed and needs to be determined according to a specific application scenario.

[0062] Figure 2 This is a schematic diagram of the control plane protocol stack in the IAB network. Figure 2 For explanation. A Uu interface is established between the terminal device 1 and the IAB2-DU, and the peer protocol layers include the radio link control (RLC) layer, the medium access control (MAC) layer and the physical layer (PHY). An F1-C interface is established between the IAB2-DU and the IAB donor CU 1, and the peer protocol layers include the F1 application protocol (F1AP) layer and the stream control transmission protocol (SCTP) layer. The IAB donor DU 1 and the IAB donor CU 1 are connected by wire, and the peer protocol layers include the internet protocol (IP) layer, layer 2 (L2) and layer 1 (L1). BL is established between IABnode2 and IAB node 3, between IAB node 3 and IAB node 1, and between IAB node 1 and IAB donor DU1. The equivalent protocol layers include the backhaul adaptation protocol (BAP), RLC, MAC, and PHY layers. In addition, the equivalent radio resource control (RRC) and packet data convergence protocol (PDCP) layers are established between the terminal device 1 and the IAB donor CU 1, and the equivalent IP layer is established between the IAB2-DU and the IAB donor DU 1.

[0063] It can be seen that compared with the control plane protocol stack of a single air interface, the control plane protocol stack of the IAB network realizes the functions of the gNB-DU of a single air interface, including the functions of establishing a peer RLC layer, MAC layer, and PHY layer with the terminal device, and the functions of establishing a peer F1AP layer and SCTP layer with the CU. Therefore, the DU connected to the IAB node in the IAB network realizes the functions of the gNB-DU of a single air interface; the IAB donor CU realizes the functions of the gNB-CU of a single air interface.

[0064] On the control plane, the RRC message is encapsulated in the F1AP message between the access IAB node and the IAB donor CU for transmission. Specifically, in the uplink direction, the terminal device 1 encapsulates the RRC message in the PDCP protocol data unit (PDU), and sends it to the IAB2-DU after being processed by the RLC layer, MAC layer and PHY layer in sequence. The IAB2-DU is processed by the PHY layer, MAC layer and RLC layer in sequence to obtain the PDCP PDU, and the PDCP PDU is encapsulated in the F1AP message, and is processed by the SCTP layer and IP layer in sequence to obtain the IP packet. The IAB2-MT sends the IP packet to the IAB3-DU after being processed by the BAP layer, RLC layer, MAC layer and PHY layer respectively. The IAB3-DU is processed by the PHY layer, MAC layer, RLC layer and BAP layer in sequence to obtain the IP packet, and then the IAB3-MT uses an operation similar to that of the IAB2-MT to send the IP packet to the IAB1-DU. Similarly, the IAB1-MT sends the IP packet to the IAB donor DU 1. After IAB donor DU 1 parses and obtains the IP packet, it sends the IP packet to IAB donor CU 1. IAB donor CU 1 processes the IP packet through the SCTP layer, F1AP layer and PDCP layer in sequence to obtain the RRC message. The downlink direction is similar and will not be described here.

[0065] Figure 3 This is a schematic diagram of the user plane protocol stack in the IAB network. Figure 3For explanation. A Uu interface is established between the terminal device 1 and the IAB2-DU, and the peer protocol layers include the RLC layer, the MAC layer, and the PHY layer. An F1-U interface is established between the IAB2-DU and the IAB donorCU 1, and the peer protocol layers include the general packet radio service (GPRS) user plane tunneling protocol (GPRS tunnelling protocol for the user plane, GTP-U) layer and the user datagram protocol (UDP) layer. The IAB donor DU 1 and the IAB donorCU 1 are connected by wire, and the peer protocol layers include the IP layer, L2, and L1. BL is established between the IAB node 2 and the IAB node 3, between the IAB node 3 and the IAB node 1, and between the IAB node 1 and the IAB donor DU 1, and the peer protocol layers include the BAP layer, the RLC layer, the MAC layer, and the PHY layer. In addition, a peer-to-peer service data adaptation protocol (SDAP) layer and PDCP layer are established between the terminal device 1 and the IAB donor CU 1, and a peer-to-peer IP layer is established between the IAB2-DU and the IAB donor DU 1.

[0066] It can be seen that compared with the user plane protocol stack of the single air interface, the user plane protocol stack of the IAB network realizes some functions of the gNB-DU of the single air interface, including the functions of establishing a peer RLC layer, MAC layer and PHY layer with the terminal device, and the functions of establishing a peer GTP-U layer and UDP layer with the IAB donor CU 1. It can be understood that the DU accessing the IAB node realizes the functions of the gNB-DU of the single air interface; the IAB donor CU realizes the functions of the gNB-CU of the single air interface.

[0067] On the user plane, PDCP packets are encapsulated and transmitted in the GTP-U tunnel between the access IAB node and the IAB donor CU. The GTP-U tunnel is established on the F1-U interface.

[0068] Figure 4 Schematic diagram of an IAB network architecture applicable to the embodiment of the present application. The present application is mainly applied to an IAB network, including an SA IAB network and an NSA IAB network. Figure 4 Furthermore, an example of the architecture in which the IAB node is connected to the IABdonor via a wireless backhaul link is given with specific node composition.

[0069] There is an F1 interface between the DU part of each IAB node and the IAB donor CU. The F1 interface includes two parts: the control plane and the user plane. The user plane part is maintained between the IAB-DU and the IAB donor CU-UP, while the control plane part is maintained between the IAB-DU and the IAB donor CU-CP.

[0070] When the IAB node works in SA mode, the IAB node can be connected to one parent node or two parent nodes. The two parent nodes can be controlled by the same IAB donor or different IAB donors. The DU part of the IAB node can establish an F1 interface with an IAB donor, which can be connected to the 5GC, such as Figure 4 The dark dotted line part in the figure. The IAB Donor CU-CP is connected to the control plane network elements in the 5GC through the NG control plane interface, such as the access and mobility management function (AMF), and the IAB Donor CU-UP is connected to the user plane network elements in the 5GC through the NG user plane interface, such as the user plane function (UPF).

[0071] When the IAB node works in NSA mode or EN-DC mode, the IAB Donor CU-UP can be connected to the EPC through the S1 user plane interface, for example, connected to the serving gateway (SGW), the master eNodeB (MeNB) and the MT of the IAB node have an LTE Uu air interface connection, the MeNB and the IAB Donor CU-CP have an X2-C interface, and the MeNB is connected to the EPC through the S1 interface, such as Figure 4 The light dotted line in .

[0072] Another possible scenario, Figure 4 The MeNB in ​​the figure can also be replaced with a 5G base station gNB. The light dotted LTE-Uu interface in the figure is replaced by an NR-Uu interface accordingly. The gNB can establish a user plane and / or control plane interface with the 5GC. The gNB and IAB Donor provide dual connection services for the IAB node. The gNB can act as the primary base station of the IAB node, or the secondary base station.

[0073] SBA is an important feature of the 5G core network architecture, which divides network functions into reusable service function modules; service function modules use a unified lightweight interface for communication. The traditional 2G, 3G, and 4G network architectures use a "point-to-point" service architecture. The interfaces between network elements need to be defined and configured in advance, and the defined interfaces can only be used between two specific types of network elements, which is not very flexible.

[0074] The characteristics of the service-oriented architecture include the following: 1) Control plane network element splitting; the functions of the original network elements are decoupled, and the same functions are aggregated in the form of network functions (NFs); 2) Service-oriented management; the first step is to register the new NF with the network repository function (NRF) after it goes online; the second step is for NRF to notify the surrounding NFs of the information of the NF; the third step is for the surrounding NFs and the new NFs to interact using the communication method obtained in the second step; 3) Interface unification; all service-oriented interfaces are implemented based on the hypertext transfer protocol secure (HTTPS). In the embodiments of the present application, network functions can be understood as service functions.

[0075] The 3rd generation partnership project (3GPP) defines the following service functions: authentication server function (AUSF), AMF, session management function (SMF), NRF, policy control function (PCF), unified data management (UDM), and network exposure function (NEF).

[0076] In response to the evolution of 6G network architecture, most equipment vendors and operators have proposed the demand for RAN service-oriented, introducing the service-oriented architecture concept of the core network side into the next-generation RAN architecture design, and realizing the rapid launch and flexible deployment of new service functions on the RAN side through interface and function service-oriented, enabling network simplification. However, the current RAN functions are highly coupled, the algorithm integration between RAN functions is high, and there is uncertainty in integration, making it difficult to integrate service function modules on the RAN side; in addition, the launch of new service functions still needs to rely on the core network, and the system complexity is high.

[0077] To this end, an embodiment of the present application proposes a communication method, which can integrate service functions on the IAB MT side based on the IAB network architecture, so that the IAB MT with service functions can provide service functions for terminal devices; in addition, it can also realize the rapid launch / update of new service functions, simplify the network, and reduce the implementation complexity.

[0078] Figure 5 This is a schematic diagram of a service-oriented architecture based on IAB MT in an embodiment of the present application. Different from the traditional IAB architecture in which IAB MT is only a terminal device and accesses the IAB-DU or IAB Donor DU of the parent node to provide wireless backhaul services; the service-oriented architecture based on IAB MT in an embodiment of the present application has the following features:

[0079] (1) Maintain the existing CU / DU architecture of the IAB host, keep the traditional communication functions of the RAN closed, and do not design them as services;

[0080] (2) Network functions / service functions are integrated on the IAB MT side, such as Figure 5 In NF1~NF4, IAB MT can communicate with the remote server through PDU session to realize online deployment and upgrade of new functions;

[0081] (3) Referring to D2D communication, IAB MT can directly serve terminal devices and networks as a remote server with the identity of terminal devices, meeting the needs of localized services. There is no need to deploy local UPF / AMF, which can reduce the latency of service access and simplify the network structure.

[0082] Figure 6 Schematic diagram of the user plane protocol stack from the terminal device to the IAB MT in the embodiment of the present application. Figure 3 The user plane protocol stack in the IAB network shown, the user plane protocol stack from the terminal device to the IAB MT in the embodiment of the present application, has the following features:

[0083] (1) For RAN localized services, the data transmission of the terminal device is terminated at the IAB MT, and the data does not need to go to the core network via the IAB Donor CU;

[0084] (2) The data of the terminal device does not pass through the IAB Donor CU, so the F1-U related protocol layer, such as the GTP-U / UDP / IP protocol layer, is not required;

[0085] (3) The application layer of the terminal device can act as a client to connect to the server of the application layer of the IAB MT to obtain NF services;

[0086] (4) There may be an IP / TCP protocol layer above the SDAP protocol layer to identify the NF.

[0087] In the embodiment of the present application, the control plane protocol stack from the terminal device / IAB MT to the IAB Donor CU can be reused Figure 2 In the control plane protocol stack in the IAB network shown, the IAB Donor CU is responsible for aligning the PDCP and / or SDAP configuration between the terminal device and the IAB MT.

[0088] Figure 7 A schematic flow chart of the communication method 700 of the embodiment of the present application. In the embodiment of the present application, the first host node can be referred to as the first host base station or the first IAB host. The data transmission path in the IAB network includes the terminal device <-> second IAB DU <-> second IAB MT <-> first IAB DU <-> first IAB MT.

[0089] 710. The first host node receives first information, where the first information is used to request to provide a first service function for the terminal device. Exemplarily, the first service function in the embodiment of the present application includes any one of AUSF, AMF, SMF, NRF, PCF, UDM, or NEF.

[0090] Optionally, the first information may be sent by the terminal device to the first host node, or may be sent by the AMF to the first host node.

[0091] In one implementation, the terminal device sends the first information to the first host node, and correspondingly, the first host node receives the first information from the terminal device.

[0092] Optionally, before the terminal device sends the first information to the first host node, the first host node sends first service function list information to the terminal device, and the first service function list information may indicate at least one first service function supported by the IAB MT included in at least one IAB node served by the first host node; correspondingly, the terminal device receives the first service function list information from the first host node, wherein at least one first service function includes a first service function, at least one IAB node includes a first IAB node, the first IAB node includes a first IAB MT, and the first IAB MT has a first service function. Optionally, the first host node may inform the terminal device of the first service function list information by broadcast or unicast. Based on this example, the terminal device can know which service functions can be provided within the topology of the first host node.

[0093] In another implementation, the AMF sends the first information to the first host node, and correspondingly, the first host node receives the first information from the AMF.

[0094] Optionally, before the AMF sends the first information to the first host node, the terminal device sends the first information to the AMF, and the first information is used to request that the first service function be provided to the terminal device; correspondingly, the AMF receives the first information from the terminal device, and determines whether the first service function can be provided within the topology of the first host node based on the first information; if the AMF determines that the first service function can be provided within the topology of the first host node, the first information is sent (forwarded) to the first host node.

[0095] Exemplarily, the terminal device sends the first information to the AMF through a non-access stratum (NAS) message, and correspondingly, the AMF receives the NAS message from the terminal device and obtains the first information based on the NAS message; the AMF determines that the first service function can be provided within the topology of the first host node based on the first information, and then the AMF sends (forwards) the first information to the first host node.

[0096] Optionally, when the AMF sends the first information to the first host node, it may also send identification information of the first IAB MT having the first service function and / or identification information of the cell corresponding to the first IAB MT to the first host node.

[0097] Optionally, before the terminal device sends the first information to the AMF, the AMF may send the first service function list information to the terminal device (through a NAS message), and the first service function list information may indicate at least one first service function supported by the IAB MT included in at least one IAB node served by the first host node; correspondingly, the terminal device receives the first service function list information from the AMF, wherein the at least one first service function includes the first service function, the at least one IAB node includes the first IAB node, the first IAB node includes the first IAB MT, and the first IAB MT has the first service function. Based on this example, the terminal device can know which service functions can be provided within the topology of the first host node.

[0098] Optionally, the first service function list information may also indicate at least one first service function supported by the cell to which the terminal device is currently accessed, or at least one first service function supported by a cell included in the tracking area (TA) where the terminal device is currently located, or at least one first service function supported by a cell included in the current registration area (RA) of the terminal device.

[0099] Optionally, before the first host node / AMF sends the first service function list information to the terminal device, at least one IAB MT sends registration request information to the first host node respectively, the registration request information is used to indicate at least one second service function that the IAB MT requests to register, and the at least one IAB MT includes the above-mentioned first IAB MT; correspondingly, the first host node receives the registration request information from the at least one IAB MT; the first host node sends registration request feedback information to the at least one IAB MT respectively, the registration request feedback information is used to indicate the second service function authorized for registration and / or the second service function refused to be authorized for registration among the at least one second service function that the IAB MT requests to register, wherein the at least one IAB MT is an IAB MT within the topology of the first host node. Optionally, the at least one first service function includes the second service function authorized for registration. The IAB MT in the at least one IAB MT receives the registration request feedback information corresponding to the IAB MT from the first host node. Optionally, the IAB MT in the at least one IAB MT communicates with the remote server through the PDU session according to the registration request feedback information to implement the download of the second service function authorized for registration.

[0100] Optionally, any IAB MT of the at least one IAB MT may send registration request information to the first host node through an RRC message, and the first host node may send registration request feedback information to the at least one IAB MT through an RRC message.

[0101] Exemplarily, after the first host node receives the registration request information from at least one IAB MT, the first host node sends the registration request information corresponding to at least one IAB MT to the AMF; correspondingly, the AMF receives the registration request information corresponding to at least one IAB MT from the first host node. According to the registration request information, the AMF sends the registration request feedback information corresponding to at least one IAB MT to the first host node; correspondingly, the first host node receives the registration request feedback information from the AMF, and sends the registration request feedback information to at least one IAB MT respectively.

[0102] Exemplarily, after the first host node receives the registration request information from at least one IAB MT, the first host node sends registration request feedback information to at least one IAB MT according to the registration request information corresponding to the at least one IAB MT; the first host node sends the registration request information to the AMF; correspondingly, the AMF receives the registration request information from the first host node; the AMF sends the registration request feedback information corresponding to at least one IAB MT to the first host node according to the registration request information; correspondingly, the first host node receives the registration request feedback information from the AMF. The registration request feedback information sent by the first host node to at least one IAB MT is the same as the registration request feedback information sent by the AMF to the first host node.

[0103] Optionally, at least one IAB MT sends registration request information to AMF through NAS messages, and the registration request information is used to indicate at least one second service function requested to be registered by the IAB MT; correspondingly, the AMF receives registration request information from at least one IAB MT; the AMF sends registration request feedback information to at least one IAB MT through NAS messages according to the registration request information corresponding to the at least one IAB MT, and the registration request feedback information is used to indicate the second service function authorized for registration and / or the second service function refused to be authorized for registration among the at least one second service function requested to be registered by the IAB MT. Optionally, at least one first service function includes the second service function authorized for registration. Optionally, the AMF may send registration request feedback information corresponding to at least one IAB MT to the first host node through an N2 message.

[0104] Optionally, the registration request information includes at least one item of identification information, service type information, and service status information corresponding to at least one second service function; the registration request feedback information includes identification information corresponding to the second service function for which authorization for registration is authorized, and / or identification information corresponding to the second service function for which authorization for registration is refused.

[0105] Exemplarily, the service type indicated by the service type information includes service types such as artificial intelligence (AI), perception, positioning, or computing. Exemplarily, the state information indicated by the service status information includes stateful and stateless. For example, when the state information indicated by the service status information corresponding to the second service function is stateful, in the case of a context corresponding to the second service function, the context corresponding to the second service function needs to be saved to maintain the service continuity of the second service function. For another example, when the state information indicated by the service status information corresponding to the second service function is stateless, the service continuity of the second service function can be maintained without saving the context corresponding to the second service function.

[0106] Exemplarily, the registration request feedback information includes identification information corresponding to the second service function for which the registration is authorized. Exemplarily, the registration request feedback information includes identification information corresponding to the second service function for which the registration is refused. Exemplarily, the registration request feedback information includes identification information corresponding to the second service function for which the registration is authorized, and identification information corresponding to the second service function for which the registration is refused.

[0107] Optionally, the registration request feedback information includes reason information for refusal of authorization corresponding to the second service function for which authorization for registration is refused. Exemplarily, the registration request feedback information includes identification information corresponding to the second service function for which authorization for registration is refused, and reason information for refusal of authorization corresponding to the second service function for which authorization for registration is refused. Exemplarily, the registration request feedback information includes identification information corresponding to the second service function for which authorization for registration is refused, identification information corresponding to the second service function for which authorization for registration is refused, and reason information for refusal of authorization corresponding to the second service function for which authorization for registration is refused.

[0108] Optionally, at least one IAB MT sends a service configuration update request message to the first host node, the service configuration update request message is used to request to update the service function list of the IAB MT, and the service configuration update request message includes at least one of the following: identification information corresponding to the service function requested to be added, identification information corresponding to the service function requested to be deleted, or identification information corresponding to the service function requested to be updated and service parameter information, wherein the service parameter information includes at least one of the above-mentioned service type information or service status information. The first host node receives the service configuration update request message from the at least one IAB MT; the first host node sends a service configuration update response message to the at least one IAB MT according to the service configuration update request message of the at least one IAB MT, the service configuration update response message includes at least one of the following: identification information corresponding to the service function authorized to be added, identification information corresponding to the service function authorized to be deleted, or identification information corresponding to the service function authorized to be updated. The IAB MT receives the service configuration update response message from the first host node. Optionally, the IAB MT communicates with the remote server through a PDU session according to the service configuration update response message to achieve downloading of the authorized added service function and / or updating of the authorized updated service function.

[0109] Optionally, the service configuration update response information may include at least one of the following: identification information corresponding to a service function for which authorization is refused to be added, identification information corresponding to a service function for which authorization is refused to be deleted, or identification information corresponding to a service function for which authorization is refused to be updated. This application does not limit this.

[0110] Exemplarily, at least one IAB MT sends service configuration update request information to the first host node respectively, and correspondingly, the first host node receives service configuration update request information from at least one IAB MT; the first host node sends service configuration update request information corresponding to at least one IAB MT to the AMF; the AMF receives service configuration update request information corresponding to at least one IAB MT from the first host node, and sends at least one service configuration update response information corresponding to the IAB MT to the first host node according to the service configuration update request information; correspondingly, the first host node receives service configuration update response information corresponding to at least one IAB MT from the AMF, and sends service configuration update response information to at least one IABMT respectively. The IAB MT receives the service configuration update response information from the first host node. Optionally, the IAB MT communicates with a remote server through a PDU session according to the service configuration update response information to implement downloading of authorized added service functions and / or updating of authorized updated service functions.

[0111] Exemplarily, any IAB MT of the at least one IAB MT may send service configuration update request information to the first host node through an RRC message, and the first host node may send service configuration update response information to the at least one IAB MT through an RRC message.

[0112] Optionally, at least one IAB MT sends service configuration update request information to AMF through NAS messages, where the service configuration update request information is used to request to update the service function list of the IAB MT, and the service configuration update request information includes at least one of the following: identification information corresponding to the service function requested to be added, identification information corresponding to the service function requested to be deleted, or identification information and service parameter information corresponding to the service function requested to be updated. ; Correspondingly, the AMF receives the service configuration update request information of at least one IAB MT; the AMF sends service configuration update response information to at least one IAB MT through NAS messages according to the service configuration update request information corresponding to the at least one IAB MT, where the service configuration update response information includes at least one of the following: identification information corresponding to the service function authorized to be added, identification information corresponding to the service function authorized to be deleted, or identification information corresponding to the service function authorized to be updated. Optionally, the AMF may send service configuration update response information corresponding to at least one IAB MT to the first host node through an N2 message.

[0113] The IAB MT can update the service function list of the IAB MT by sending the service configuration update request information, thereby enabling rapid launch / update of new service functions.

[0114] 720. The first host node sends first configuration information to the first IAB DU according to the first information, where the first configuration information indicates a correspondence between a first data radio bearer (DRB) identifier and a first backhaul adaptation protocol (BAP) routing identity (routing ID), wherein the first IAB node includes a first IAB MT and a first IAB DU.

[0115] 730. The first host node sends second configuration information to the second IAB DU according to the first information. The second configuration information indicates a correspondence between a second DRB identifier and a second BAP routing identifier. The second IAB node includes the second IAB DU. The second IAB node is an access IAB node of the terminal device.

[0116] Among them, step 720 and step 730 can be executed simultaneously, and step 730 can also be executed before step 720, which is not limited in the embodiment of the present application.

[0117] Optionally, before the first host node sends the first configuration information and the second configuration information, the first host node determines, based on the first information, a first data transmission path between the terminal device and the first IAB MT and first service quality requirement information corresponding to a first service function within the topology of the first host node; the first host node determines the first configuration information and the second configuration information based on the first data transmission path and the first service quality requirement information.

[0118] Optionally, the first host node establishes the context of the terminal device at the second IAB DU, and there is no need to establish an F1-U tunnel for the DRB. Therefore, the data does not need to pass through the first host node.

[0119] Figure 8 A schematic diagram of an IAB node in the topology of a first host node. Taking the first service function as NF1 as an example, the first data transmission path between the terminal device and the first IAB MT is terminal device <-> second IAB DU <-> second IAB MT <-> first IAB DU <-> first IAB MT, wherein the second IAB node includes the second IAB DU and the second IAB MT. When the first IAB DU receives a data packet from the first IAB MT, the first IAB DU replaces the first DRB identifier carried by the data packet with the first BAP routing identifier, and sends the data packet to the second IAB MT. When the second IAB DU receives a data packet from the terminal device, the second IAB DU replaces the second DRB identifier carried by the data packet with the second BAP routing identifier, and sends the data packet to the second IAB MT.

[0120] For example, when the first IAB DU receives a data packet from the second IAB MT, the first IAB DU determines whether the BAP routing identifier carried by the data packet is the same as the BAP routing identifier configured by the first host node. If they are the same, the BAP header of the data packet is removed; and further determines whether the data packet carries a full tunnel endpoint identifier (FTEID). If the FTEID is not carried, the data packet is sent to the first IAB MT.

[0121] Optionally, when routing a data packet, the IAB node may search the upstream routing table and the downstream routing table simultaneously according to the BAP routing ID of the data packet. If a next-hop IAB node matching the BAP routing ID is found, the data packet is sent to the next-hop IAB node.

[0122] Optionally, before step 720 and step 730, the first host node determines, based on the first information, that the first IAB MT is allowed to provide the first service function for the terminal device. An exemplary description is given below in conjunction with step 721 and step 722.

[0123] Optionally, 721, the first host node sends second information to the first IAB MT according to the first information, the second information requests providing the first service function for the terminal device, the first IAB MT has the first service function, and the first IAB node served by the first host node includes the first IAB MT.

[0124] 722, the first IAB MT receives the second information from the first host node; the first IAB MT determines whether to provide the first service function for the terminal device according to the current load; if the first IAB MT determines to provide the first service function for the terminal device according to the current load, the first IAB MT sends third information to the first host node, and the third information is used to indicate that the first IABMT allows the first service function to be provided for the terminal device; the first host node receives the third information from the first IAB MT. For example, when the current load of the first IAB MT is small, the first IAB MT determines to provide the first service function for the terminal device; when the current load of the first IAB MT is large, the first IAB MT determines not to provide the first service function for the terminal device.

[0125] Exemplarily, the first host node determines, based on the first information, that the first IAB MT included in the first IAB node served by the first host node has the first service function; the first host node sends second information to the first IAB MT through an RRC message, and the second information requests to provide the first service function for the terminal device; the first IAB MT receives the RRC message from the first host node, and obtains the second information based on the RRC message; if the first IAB MT determines to provide the first service function for the terminal device based on the current load, the first IAB MT sends third information to the first host node through the RRC message, and the third information is used to indicate that the first IAB MT allows the first service function to be provided to the terminal device; the first host node receives the RRC message from the first IAB MT, and obtains the third information based on the RRC message.

[0126] Exemplarily, the first host node determines, based on the first information, that the first IAB MT included in the first IAB node served by the first host node has the first service function; the first host node sends second information including the first IAB DU to the first IAB node through an F1 message, and the second information requests to provide the first service function for the terminal device; the first IAB DU receives the F1 message from the first host node, and obtains the second information based on the F1 message; the first IAB DU forwards the second information to the first IAB MT; if the first IAB MT determines to provide the first service function for the terminal device based on the current load, the first IAB MT sends third information to the first IAB DU, and the third information is used to indicate that the first IAB MT allows the first service function to be provided to the terminal device; the first IAB DU sends (forwards) the third information to the first host node through the F1 message; the first host node receives the F1 message from the first IAB DU, and obtains the third information based on the F1 message.

[0127] Optionally, since the first IAB MT has the first service function, the first host node may assume that the first IAB MT is allowed to provide the first service function for the terminal device, thereby not needing to send the second information to the first IAB MT.

[0128] 740. The first host node sends first RRC reconfiguration information to the first IAB MT and the terminal device respectively according to the first information, and the first RRC reconfiguration information indicates PDCP configuration information and / or SDAP configuration information; correspondingly, the first IAB MT receives the first RRC reconfiguration information from the first host node, and the terminal device receives the first RRC reconfiguration information from the first host node. The RRC reconfiguration information sent by the first host node to the first IAB MT and the terminal device respectively is the same, and is used to align the PDCP configuration information and / or SDAP configuration information on the terminal device side and the first IAB MT (first IAB node) side.

[0129] Exemplarily, the first host node performs RRC reconfiguration on the first IAB MT and the terminal device to generate first RRC reconfiguration information; the first host node sends the first RRC reconfiguration information to the first IAB MT and the terminal device respectively.

[0130] Optionally, the terminal device and the first IAB MT communicate with each other for the first service function, so that the first IAB MT can provide the first service function for the terminal device.

[0131] In the technical solution provided in the embodiment of the present application, the service function is integrated on the IAB MT side. When the first host node receives the first information requesting to provide the first service function for the terminal device, the first host node can send the first configuration information to the first IAB DU according to the first information, and send the second configuration information to the second IAB DU included in the access IAB node of the terminal device, wherein the first IAB node includes the first IAB DU and the first IAB MT, and the first IAB MT has the first service function; the first host node can also send RRC reconfiguration information to the first IAB MT and the terminal device respectively according to the first information to align the PDCP configuration information and / or SDAP configuration information on the terminal device side and the first IAB MT side, so as to realize the communication between the terminal device and the first IAB MT having the first service function, so as to realize the first IAB MT providing the first service function for the terminal device. In addition, integrating the service function on the IAB MT side can simplify the network and reduce the complexity of implementation.

[0132] To facilitate understanding of the embodiments of the present application, the communication method provided in the embodiments of the present application is described below with reference to specific examples.

[0133] Fig. 9 A schematic flow chart of an example of a communication method provided in an embodiment of the present application. The first host node may be referred to as a first host base station or a first IAB host. The data transmission path in the IAB network includes a terminal device <-> second IAB DU <-> second IAB MT <-> first IAB DU <-> first IAB MT.

[0134] 901, at least one IAB MT sends registration request information to a first host node respectively, where the registration request information is used to indicate at least one second service function that the IAB MT requests to register, and the at least one IAB MT includes a first IAB MT; correspondingly, the first host node receives registration request information from the at least one IAB MT, where the at least one IAB MT is an IAB MT within the first host node topology.

[0135] 902, the first host node sends registration request feedback information to at least one IAB MT respectively, and the registration request feedback information is used to indicate the second service function authorized for registration and / or the second service function refused to be authorized for registration among the at least one second service function requested to be registered by the IAB MT. Correspondingly, the IAB MT in the at least one IAB MT receives the registration request feedback information corresponding to the IAB MT from the first host node. Optionally, the IAB MT in the at least one IAB MT communicates with the remote server through the PDU session according to the registration request feedback information to realize the download of the second service function authorized for registration.

[0136] Exemplarily, after the first host node receives the registration request information from at least one IAB MT, the first host node sends the registration request information corresponding to at least one IAB MT to the AMF; correspondingly, the AMF receives the registration request information corresponding to at least one IAB MT from the first host node. According to the registration request information, the AMF sends the registration request feedback information corresponding to at least one IAB MT to the first host node; correspondingly, the first host node receives the registration request feedback information from the AMF, and sends the registration request feedback information to at least one IAB MT respectively.

[0137] Optionally, any IAB MT of the at least one IAB MT may send registration request information to the first host node through an RRC message, and the first host node may send registration request feedback information to the at least one IAB MT through an RRC message.

[0138] Optionally, the registration request information includes at least one item of identification information, service type information, and service status information corresponding to at least one second service function; the registration request feedback information includes identification information corresponding to the second service function for which authorization for registration is authorized, and / or identification information corresponding to the second service function for which authorization for registration is refused.

[0139] Exemplarily, the service type indicated by the service type information includes service types such as AI, perception, positioning, or computing. Exemplarily, the state information indicated by the service status information includes stateful and stateless. For example, when the state information indicated by the service status information corresponding to the second service function is stateful, in the case of a context corresponding to the second service function, the context corresponding to the second service function needs to be saved to maintain the service continuity of the second service function. For another example, when the state information indicated by the service status information corresponding to the second service function is stateless, the service continuity of the second service function can be maintained without saving the context corresponding to the second service function.

[0140] Optionally, the registration request feedback information includes reason information for refusal of authorization corresponding to the second service function for which authorization for registration is refused. Exemplarily, the registration request feedback information includes identification information corresponding to the second service function for which authorization for registration is refused, and reason information for refusal of authorization corresponding to the second service function for which authorization for registration is refused. Exemplarily, the registration request feedback information includes identification information corresponding to the second service function for which authorization for registration is refused, identification information corresponding to the second service function for which authorization for registration is refused, and reason information for refusal of authorization corresponding to the second service function for which authorization for registration is refused.

[0141] 903, the first host node sends first service function list information to the terminal device, the first service function list information indicates at least one first service function supported by the IAB MT included in at least one IAB node served by the first host node, wherein the at least one first service function includes the second service function authorized to be registered by the at least one IAB MT, the at least one first service function / the second service function authorized to be registered by at least one IAB MT includes the first service function, the at least one IAB node served by the first host node includes the first IAB node, and the first IAB node includes the first IAB MT. Correspondingly, the terminal device receives the first service function list information from the first host node.

[0142] Optionally, at least one IAB MT sends a service configuration update request message to the first host node, the service configuration update request message is used to request to update the service function list of the IAB MT, and the service configuration update request message includes at least one of the following: identification information corresponding to the service function requested to be added, identification information corresponding to the service function requested to be deleted, or identification information and service parameter information corresponding to the service function requested to be updated. The first host node receives the service configuration update request message from the at least one IAB MT; the first host node sends a service configuration update response message to the at least one IAB MT according to the service configuration update request message of the at least one IAB MT, the service configuration update response message includes at least one of the following: identification information corresponding to the service function authorized to be added, identification information corresponding to the service function authorized to be deleted, or identification information corresponding to the service function authorized to be updated. The IAB MT receives the service configuration update response message from the first host node. Optionally, the IAB MT communicates with a remote server through a PDU session according to the service configuration update response message to implement downloading of the authorized added service function and / or updating of the authorized updated service function.

[0143] Exemplarily, at least one IAB MT sends service configuration update request information to the first host node respectively, and correspondingly, the first host node receives service configuration update request information from at least one IAB MT; the first host node sends service configuration update request information corresponding to at least one IAB MT to the AMF; the AMF receives service configuration update request information corresponding to at least one IAB MT from the first host node, and sends at least one service configuration update response information corresponding to the IAB MT to the first host node according to the service configuration update request information; correspondingly, the first host node receives service configuration update response information corresponding to at least one IAB MT from the AMF, and sends service configuration update response information to at least one IABMT respectively. The IAB MT receives the service configuration update response information from the first host node. Optionally, the IAB MT communicates with a remote server through a PDU session according to the service configuration update response information to implement downloading of authorized added service functions and / or updating of authorized updated service functions.

[0144] Exemplarily, any IAB MT of the at least one IAB MT may send service configuration update request information to the first host node through an RRC message, and the first host node may send service configuration update response information to the at least one IAB MT through an RRC message.

[0145] 904, the terminal device sends first information to the first host node, where the first information is used to request to provide a first service function for the terminal device; correspondingly, the first host node receives the first information from the terminal device.

[0146] 905, the first host node determines, based on the first information, that a first IAB MT included in a first IAB node served by the first host node has a first service function, and the first host node sends second information to the first IAB MT, where the second information is used to request that the first service function be provided to the terminal device. Correspondingly, the first IAB MT receives the first information from the first host node.

[0147] 906: The first IAB MT determines whether to provide the first service function for the terminal device according to the current load.

[0148] 907, if the first IAB MT determines to provide the first service function for the terminal device according to the current load, the first IAB MT sends third information to the first host node, and the third information is used to indicate that the first IAB MT is allowed to provide the first service function for the terminal device. Correspondingly, the first host node receives the third information from the first IAB MT.

[0149] Exemplarily, the first host node may send the second information to the first IAB MT through an RRC message, and the first IABMT may send the third information to the first host node through an RRC message.

[0150] 908: The first IAB MT determines, according to the third information, a first data transmission path between the terminal device and the first IAB MT and first service quality requirement information corresponding to a first service function in the topology of the first host node.

[0151] 909. The first host node determines, based on the first data transmission path and the first quality of service requirement information, first configuration information corresponding to the first IAB DU and second configuration information corresponding to the second IAB DU, wherein the first configuration information indicates a correspondence between the first DRB identifier and the first BAP routing identifier, and the second configuration information indicates a correspondence between the second DRB identifier and the second BAP routing identifier, wherein the first IAB node includes a first IAB DU and a first IAB MT, the second IAB node includes a second IAB DU, and the second IAB node is an access IAB node of the terminal device.

[0152] 910. The first host node sends first configuration information to the first IAB DU. Correspondingly, the first IAB DU receives the first configuration information from the first host node.

[0153] 911, the first host node sends the second configuration information to the second IAB DU; correspondingly, the second IAB DU receives the second configuration information from the first host node. Step 910 and step 911 may be performed simultaneously, and step 911 may also be performed before step 910, which is not limited in the embodiment of the present application.

[0154] 912. The first host node establishes a context of the terminal device at the second IAB DU. There is no need to establish an F1-U tunnel for the DRB. Therefore, the data does not need to pass through the first host node.

[0155] 913, the first host node sends first RRC reconfiguration information to the first IAB MT and the terminal device respectively, the first RRC reconfiguration information indicating PDCP configuration information and / or SDAP configuration information; correspondingly, the first IAB MT receives the first RRC reconfiguration information from the first host node, and the terminal device receives the first RRC reconfiguration information from the first host node, wherein the RRC reconfiguration information sent by the first host node to the first IAB MT and the terminal device respectively is the same, and is used to align the PDCP configuration information and / or SDAP configuration information on the terminal device side and the first IAB MT (first IAB node) side. .

[0156] Exemplarily, the first host node performs RRC reconfiguration on the first IAB MT and the terminal device to generate first RRC reconfiguration information; the first host node sends the first RRC reconfiguration information to the first IAB MT and the terminal device respectively.

[0157] 914, the terminal device communicates with the first IAB MT, so that the first IAB MT can provide the first service function for the terminal device.

[0158] Fig.10 Another schematic flow chart of the communication method 1000 of the embodiment of the present application is shown. In the embodiment of the present application, the first host node can be referred to as the first host base station or the first IAB host, and the second host node can be referred to as the second host base station or the second IAB host; the data transmission path in the IAB network includes the terminal device <-> second IAB DU <-> second IAB MT <-> first host node <-> second host node <-> first IAB MT.

[0159] 1010. A first host node receives first information, where the first information is used to request to provide a first service function for a terminal device.

[0160] Optionally, the first information may be sent by the terminal device to the first host node, or may be sent by the AMF to the first host node.

[0161] In one implementation, the terminal device sends the first information to the first host node, and correspondingly, the first host node receives the first information from the terminal device.

[0162] Optionally, before the terminal device sends the first information to the first host node, the first host node sends the second service function list information to the terminal device, and the second service function list information indicates at least one first service function supported by the IAB MT included in at least one IAB node served by the first host node and at least one third service function supported by the IAB MT included in at least one IAB node served by the second host node. Correspondingly, the terminal device receives the second service function list information from the first host node, wherein the at least one third service function includes the first service function, the at least one IAB node served by the second host node includes the first IAB node, the first IAB node includes the first IAB MT, and the first IAB MT has the first service function. Optionally, the first host node can inform the terminal device of the second service function list information by broadcast or unicast. Based on this example, the terminal device can know which service functions can be provided by the terminal device through the first host node.

[0163] In another implementation, the AMF sends the first information to the first host node, and correspondingly, the first host node receives the first information from the AMF.

[0164] Optionally, before the AMF sends the first information to the first host node, the terminal device sends the first information to the AMF, where the first information is used to request that the first service function be provided to the terminal device; correspondingly, the AMF receives the first information from the terminal device and sends (forwards) the first information to the first host node. Exemplarily, the terminal device may send the first information to the AMF via a NAS message.

[0165] Optionally, when the AMF sends the first information to the first host node, it may also send identification information of the first IAB MT having the first service function and / or identification information of the cell corresponding to the first IAB MT to the first host node.

[0166] Optionally, before the terminal device sends the first information to the AMF, the AMF may send second service function list information to the terminal device (via a NAS message), where the second service function list information indicates at least one first service function supported by an IAB MT included in at least one IAB node served by the first host node and at least one third service function supported by an IAB MT included in at least one IAB node served by the second host node. Correspondingly, the terminal device receives the second service function list information from the first host node, where at least one third service function includes the first service function, at least one IAB node served by the second host node includes the first IAB node, the first IAB node includes the first IAB MT, and the first IAB MT has the first service function. Based on this example, the terminal device can know which service functions can be provided by the terminal device through the first host node.

[0167] Optionally, before the first host node receives the first information, the first host node sends first indication information to the second host node, the first indication information indicating at least one first service function supported by the IAB MT included in at least one IAB node served by the first host node; correspondingly, the second host node receives the first indication information from the first host node. The second host node sends second indication information to the first host node, the second indication information indicating at least one third service function supported by the IAB MT included in at least one IAB node served by the second host node; correspondingly, the first host node receives the second indication information from the second host node. Exemplarily, the first host node and the second host node interact through the Xn interface. Based on this optional scheme, the first host node and the second host node can learn the service functions supported in their respective topologies through interaction.

[0168] Optionally, before the first host node / AMF sends the second service function list information to the terminal device, at least one IAB MT served by the first host node sends first registration request information to the first host node respectively, and the first registration request information is used to indicate at least one second service function requested to be registered by the IAB MT; correspondingly, the first host node receives the first registration request information from at least one IAB MT served by the first host node; the first host node sends first registration request feedback information to at least one IAB MT served by the first host node respectively, and the first registration request feedback information is used to indicate the second service function authorized for registration and / or the second service function refused to be authorized for registration among the at least one second service function requested to be registered by the IAB MT. Optionally, the at least one first service function includes the second service function authorized for registration. The IAB MT in the at least one IAB MT served by the first host node receives the first registration request feedback information corresponding to the IAB MT from the first host node. Optionally, the IAB MT in the at least one IAB MT served by the first host node communicates with the remote server through the PDU session according to the first registration request feedback information to implement the download of the second service function authorized for registration.

[0169] Optionally, any IAB MT of the at least one IAB MT served by the first host node may send first registration request information to the first host node through an RRC message, and the first host node may send first registration request feedback information to the at least one IABMT through an RRC message.

[0170] Exemplarily, after the first host node receives the first registration request information from at least one IAB MT served by the first host node, the first host node sends the first registration request information corresponding to the at least one IAB MT served by the first host node to the AMF; correspondingly, the AMF receives the first registration request information corresponding to the at least one IAB MT from the first host node. Based on the first registration request information, the AMF sends the first registration request feedback information corresponding to the at least one IABMT to the first host node; correspondingly, the first host node receives the first registration request feedback information from the AMF, and sends the first registration request feedback information to the at least one IAB MT served by the first host node.

[0171] Optionally, at least one IAB MT served by the first host node sends first registration request information to AMF through NAS messages, and the first registration request information is used to indicate at least one second service function requested to be registered by the IAB MT; correspondingly, the AMF receives the first registration request information from at least one IAB MT served by the first host node; the AMF sends first registration request feedback information to at least one IAB MT served by the first host node through NAS messages according to the first registration request information corresponding to the at least one IAB MT, and the first registration request feedback information is used to indicate the second service function authorized for registration and / or the second service function refused to be authorized for registration among the at least one second service function requested to be registered by the IAB MT. Optionally, the at least one first service function includes the second service function authorized for registration. Optionally, the AMF may send the first registration request feedback information corresponding to the at least one IAB MT served by the first host node to the first host node through an N2 message.

[0172] Optionally, the first registration request information includes at least one item of identification information, service type information, and service status information corresponding to at least one second service function; the first registration request feedback information includes identification information corresponding to the second service function for which authorization for registration is authorized, and / or identification information corresponding to the second service function for which authorization for registration is refused.

[0173] Optionally, the first registration request feedback information includes reason information for refusal of authorization corresponding to the second service function for which authorization registration is refused. Exemplarily, the first registration request feedback information includes identification information corresponding to the second service function for which authorization registration is refused, and reason information for refusal of authorization corresponding to the second service function for which authorization registration is refused. Exemplarily, the first registration request feedback information includes identification information corresponding to the second service function for which authorization registration is refused, identification information corresponding to the second service function for which authorization registration is refused, and reason information for refusal of authorization corresponding to the second service function for which authorization registration is refused.

[0174] Optionally, before the first host node / AMF sends the second service function list information to the terminal device, at least one IAB MT served by the second host node sends a second registration request information to the second host node, and the second registration request information is used to indicate at least one fourth service function requested to be registered by the IAB MT; correspondingly, the second host node receives the second registration request information from at least one IAB MT served by the second host node; the second host node sends a second registration request feedback information to at least one IAB MT served by the second host node, and the second registration request feedback information is used to indicate the fourth service function authorized for registration and / or the fourth service function refused to be authorized for registration among the at least one fourth service function requested to be registered by the IAB MT. Optionally, the at least one third service function includes the fourth service function authorized for registration. The IAB MT in the at least one IAB MT served by the second host node receives the second registration request feedback information corresponding to the IAB MT from the second host node. Optionally, the IAB MT in the at least one IAB MT served by the second host node communicates with the remote server through the PDU session according to the second registration request feedback information to implement the download of the fourth service function authorized for registration.

[0175] Optionally, any IAB MT of the at least one IAB MT served by the second host node may send second registration request information to the second host node through an RRC message, and the second host node may send second registration request feedback information to the at least one IABMT through an RRC message.

[0176] Exemplarily, after the second host node receives the second registration request information from at least one IAB MT served by the second host node, the second host node sends the second registration request information corresponding to the at least one IAB MT served by the second host node to the AMF; correspondingly, the AMF receives the second registration request information corresponding to the at least one IAB MT from the second host node. Based on the second registration request information, the AMF sends the second registration request feedback information corresponding to the at least one IABMT to the second host node; correspondingly, the second host node receives the second registration request feedback information from the AMF, and sends the second registration request feedback information to the at least one IAB MT served by the second host node.

[0177] Optionally, at least one IAB MT served by the second host node sends a second registration request message to the AMF through a NAS message, and the second registration request message is used to indicate at least one fourth service function requested to be registered by the IAB MT; correspondingly, the AMF receives the second registration request message from at least one IAB MT served by the second host node; the AMF sends a second registration request feedback message to at least one IAB MT served by the second host node through a NAS message according to the second registration request message corresponding to the at least one IAB MT, and the second registration request feedback message is used to indicate the fourth service function authorized for registration and / or the fourth service function refused to be authorized for registration among the at least one fourth service function requested to be registered by the IAB MT. Optionally, the at least one third service function includes the fourth service function authorized for registration. Optionally, the AMF may send the second registration request feedback message corresponding to the at least one IAB MT served by the second host node to the second host node through an N2 message.

[0178] Optionally, the second registration request information includes at least one item of identification information, service type information, and service status information corresponding to at least one fourth service function; the second registration request feedback information includes identification information corresponding to the fourth service function for authorized registration, and / or identification information corresponding to the fourth service function for rejected authorization registration.

[0179] Optionally, the second registration request feedback information includes reason information for refusal of authorization corresponding to the fourth service function for which authorization registration is refused. Exemplarily, the second registration request feedback information includes identification information corresponding to the fourth service function for which authorization registration is refused, and reason information for refusal of authorization corresponding to the fourth service function for which authorization registration is refused. Exemplarily, the second registration request feedback information includes identification information corresponding to the fourth service function for which authorization registration is refused, identification information corresponding to the fourth service function for which authorization registration is refused, and reason information for refusal of authorization corresponding to the fourth service function for which authorization registration is refused.

[0180] Exemplarily, the service type indicated by the service type information includes AI, perception, positioning, or computing service types. Exemplarily, the state information indicated by the service state information includes stateful and stateless.

[0181] Optionally, at least one IAB MT served by the first host node sends a first service configuration update request message to the first host node respectively, the first service configuration update request message is used to request to update the service function list of the IAB MT, and the first service configuration update request message includes at least one of the following: identification information corresponding to the service function requested to be added, identification information corresponding to the service function requested to be deleted, or identification information and service parameter information corresponding to the service function requested to be updated. The first host node receives the first service configuration update request message from at least one IAB MT served by the first host node; the first host node sends a first service configuration update response message to at least one IAB MT served by the first host node according to the first service configuration update request message of at least one IAB MT, the first service configuration update response message includes at least one of the following: identification information corresponding to the service function authorized to be added, identification information corresponding to the service function authorized to be deleted, or identification information corresponding to the service function authorized to be updated. The IAB MT receives the first service configuration update response message from the first host node. Optionally, an IAB MT among the at least one IAB MT served by the first host node communicates with the remote server through a PDU session according to the first service configuration update response information to download the authorized added service function and / or update the authorized updated service function.

[0182] Optionally, the first service configuration update response information may include at least one of the following: identification information corresponding to a service function for which authorization is refused to be added, identification information corresponding to a service function for which authorization is refused to be deleted, or identification information corresponding to a service function for which authorization is refused to be updated. This application does not limit this.

[0183] Based on this optional solution, the IAB MT can update the service function list of the IAB MT by sending the first service configuration update request information, thereby realizing rapid launch / update of new service functions.

[0184] Optionally, at least one IAB MT served by the second host node sends a second service configuration update request message to the second host node, the second service configuration update request message is used to request to update the service function list of the IAB MT, and the second service configuration update request message includes at least one of the following: identification information corresponding to the service function requested to be added, identification information corresponding to the service function requested to be deleted, or identification information and service parameter information corresponding to the service function requested to be updated. The second host node receives the second service configuration update request message from at least one IAB MT served by the second host node; the second host node sends a second service configuration update response message to at least one IAB MT served by the second host node according to the second service configuration update request message of at least one IAB MT, the second service configuration update response message includes at least one of the following: identification information corresponding to the service function authorized to be added, identification information corresponding to the service function authorized to be deleted, or identification information corresponding to the service function authorized to be updated. The IAB MT receives the second service configuration update response message from the second host node. Optionally, an IAB MT in at least one IAB MT served by the second host node communicates with the remote server through a PDU session according to the second service configuration update response information to download the authorized added service function and / or update the authorized updated service function.

[0185] Optionally, the second service configuration update response information may include at least one of the following: identification information corresponding to a service function for which authorization is refused to be added, identification information corresponding to a service function for which authorization is refused to be deleted, or identification information corresponding to a service function for which authorization is refused to be updated. This application does not limit this.

[0186] Based on this optional solution, the IAB MT can update the service function list of the IAB MT by sending the second service configuration update request information, thereby realizing rapid launch / update of new service functions.

[0187] 1020. The first host node sends third configuration information to the second IAB DU according to the first information, the third configuration information indicating a correspondence between a third bearer DRB identifier and a third BAP routing identifier, the second IAB node includes the second IAB DU, the second IAB node is an access IAB node of the terminal device, and the at least one IAB node served by the first host node includes the second IAB node. Correspondingly, the second IAB DU receives the third configuration information from the first host node.

[0188] Optionally, before the first host node sends the third configuration information to the second IAB DU, the first host node determines, based on the first information, a second data transmission path between the terminal device and the first host node, second quality of service requirement information corresponding to the first service function within the topology of the first host node, and third quality of service requirement information corresponding to the first service function within the topology of the second host node; the first host node determines the third configuration information based on the second data transmission path, the second quality of service requirement information, and the third quality of service requirement information.

[0189] Optionally, before step 1020, the first host node determines, based on the first information, that the first IAB MT is allowed to provide the first service function for the terminal device. The following is an exemplary description in conjunction with steps 1021 to 1024.

[0190] Optionally, 1021, the first host node sends service request information to the second host node based on the first information, where the service request information is used to request to provide the first service function for the terminal device; correspondingly, the second host node receives the service request information from the first host node.

[0191] 1022. The second host node sends fourth information to the first IAB MT according to the service request information. The fourth information is used to request the first IAB MT to provide the first service function for the terminal device. The first IAB MT has the first service function. Correspondingly, the first IAB MT receives the fourth information from the second host node.

[0192] 1023, the first IAB MT determines whether to provide the first service function for the terminal device according to the current load; if the first IAB MT provides the first service function for the terminal device according to the current determination, the first IAB MT sends fifth information to the second host node, and the fifth information is used to indicate that the first IAB MT is allowed to provide the first service function for the terminal device; correspondingly, the second host node receives the fifth information from the first IAB MT. For example, when the current load of the first IAB MT is small, the first IAB MT determines to provide the first service function for the terminal device; when the current load of the first IAB MT is large, the first IABMT determines not to provide the first service function for the terminal device.

[0193] Exemplarily, the second host node determines, based on the service request information, that the first IAB MT included in the first IAB node served by the second host node has the first service function; the second host node sends fourth information to the first IAB MT through an RRC message, and the fourth information requests that the first service function be provided to the terminal device; the first IAB MT receives the RRC message from the first host node, and obtains the fourth information based on the RRC message; if the first IAB MT determines to provide the first service function to the terminal device based on the current load, the first IAB MT sends fifth information to the first host node through an RRC message, and the fifth information is used to indicate that the first IAB MT allows the first service function to be provided to the terminal device; the first host node receives the RRC message from the first IAB MT, and obtains the fifth information based on the RRC message.

[0194] 1024. The second host node sends service request response information to the first host node according to the fifth information. The service request response information is used to indicate that the first IAB MT allows providing the first service function for the terminal device. Correspondingly, the first host node receives the service request response information from the second host node.

[0195] Optionally, since the first IAB MT has the first service function, the first host node may assume that the first IAB MT is allowed to provide the first service function for the terminal device, thereby not needing to send service request information to the second host node.

[0196] 1030, the first host node sends management request information to the second host node, the management request information includes the third service quality requirement information corresponding to the first service function in the topology of the second host node, the first identification information allocated by the first host node to the first IABMT, the transport network layer (TNL) information corresponding to the DU included in the first host node, and the third BAP routing identification information. Correspondingly, the second host node receives the management request information from the first host node. The management request information sent by the first host node to the second host node is used to open up a data channel between the first host node and the second host node.

[0197] 1040. The second host node sends fourth configuration information to the first IAB DU according to the management request information, where the fourth configuration information indicates a correspondence between a fourth DRB identifier and a fourth BAP routing identifier, and the first IAB node served by the second host node includes a first IAB MT and a first IAB DU. Correspondingly, the first IAB DU receives the fourth configuration information from the second host node.

[0198] Optionally, before the second host node sends the fourth configuration information to the first IAB DU, the second host node determines a third data transmission path and third service quality requirement information between the second host node and the first IAB MT based on the management request information from the first host node; the second host node determines the fourth configuration information based on the third data transmission path and the third service quality requirement information.

[0199] Fig.11 A schematic diagram of an IAB node in the topology of a first host node and a second host node. Taking the first service function as NF3 as an example, the data transmission path between the terminal device and the first IAB MT is terminal device <-> second IABDU <-> second IAB MT <-> third IAB DU <-> third IAB MT <-> first host node (DU of the first host node) <-> second host node (DU of the second host node) <-> first IAB MT. Among them, the second IAB node includes the second IAB DU and the second IAB MT, and the third IAB node includes the third IAB DU and the third IAB MT. When the second IAB DU receives a data packet from the terminal device, the second IAB DU replaces the third DRB identifier carried by the data packet with the third BAP routing identifier, and sends the data packet to the second IAB MT. When the first IAB MT receives a data packet from the DU of the second host node, the first IAB MT sends the data packet to the first IAB DU, and the first IAB DU can determine that the data packet is sent to itself according to the fourth BAP routing identifier and the fourth configuration information carried by the data packet.

[0200] 1050. The second host node sends first RRC reconfiguration information to the first IAB MT according to the management request information. The first RRC reconfiguration information indicates PDCP configuration information and / or SDAP configuration information. The PDCP configuration information corresponding to the first IAB MT is the same as the PDCP configuration information corresponding to the terminal device. The SDAP configuration information corresponding to the first IAB MT is the same as the SDAP configuration information corresponding to the terminal device. Correspondingly, the first IAB MT receives the first RRC reconfiguration information from the second host node.

[0201] 1060, the second host node sends management request response information to the first host node, where the management request response information includes the second identification information allocated by the second host node to the first IAB MT, the transmission network layer information corresponding to the DU included in the second host node, and the fourth BAP routing identification information. Correspondingly, the first host node receives the management request response information from the second host node.

[0202] Optionally, the first host node establishes the context of the terminal device at the second IAB DU, and there is no need to establish an F1-U tunnel for the DRB. Therefore, the data does not need to pass through the CU of the first host node.

[0203] 1070. The first host node sends second RRC reconfiguration information to the terminal device according to the management request response information, where the second RRC reconfiguration information indicates PDCP configuration information and / or SDAP configuration information, and the PDCP configuration information corresponding to the first IAB MT is the same as the PDCP configuration information corresponding to the terminal device, and the SDAP configuration information corresponding to the first IAB MT is the same as the SDAP configuration information corresponding to the terminal device. Correspondingly, the terminal device receives the second RRC reconfiguration information from the first host node.

[0204] Optionally, the management request information also includes third indication information, which indicates the PDCP configuration information and / or SDAP configuration information corresponding to the first IAB MT; or, the management request response information also includes fourth indication information, which indicates the PDCP configuration information and / or SDAP configuration information corresponding to the terminal device.

[0205] Optionally, the terminal device and the first IAB MT communicate with each other for the first service function, so that the first IAB MT can provide the first service function for the terminal device.

[0206] In the technical solution provided in the embodiment of the present application, the service function is integrated on the IAB MT side. When the first host node receives the first information requesting to provide the first service function for the terminal device, the first host node can send the third configuration information to the second IAB DU according to the first information. The second IAB node served by the first host node includes the second IAB DU, and the second IAB node is the access IAB node of the terminal device; the first host node can send the management request information to the second host node according to the first information. The first IAB MT included in the first IAB node served by the second host node has the first service function; the second host node can send the fourth configuration information to the first IAB DU according to the received management request information. The first IAB node also includes the first IAB DU; the second host node can also send RRC reconfiguration information to the first IAB MT; after the first host node receives the management request response information from the second host node, it can also send the RRC reconfiguration information to the terminal device to align the PDCP configuration information and / or SDAP configuration information on the terminal device side and the first IAB MT side, so as to realize the communication between the terminal device and the first IAB MT having the first service function, thereby realizing the first IAB The MT provides the first service function for the terminal device. In addition, integrating the service function on the IAB MT side can simplify the network and reduce the implementation complexity.

[0207] To facilitate understanding of the embodiments of the present application, the communication method provided in the embodiments of the present application is described below with reference to specific examples.

[0208] Fig.12 A schematic flow chart of another example of a communication method provided in an embodiment of the present application. The first host node may be referred to as a first host base station or a first IAB host; the second host node may be referred to as a second host base station or a second IAB host. The data transmission path in the IAB network includes a terminal device <-> second IAB DU <-> second IAB MT <-> first host node <-> second host node <-> first IAB MT.

[0209] 1201, at least one IAB MT served by a first host node sends first registration request information to the first host node respectively, where the registration request information is used to indicate at least one second service function that the IAB MT requests to register; correspondingly, the first host node receives the first registration request information from at least one IAB MT served by the first host node.

[0210] 1202, the first host node sends first registration request feedback information to at least one IAB MT served by the first host node, respectively, and the first registration request feedback information is used to indicate the second service function authorized for registration and / or the second service function refused to be authorized for registration among at least one second service function requested to be registered by the IAB MT. Correspondingly, the IAB MT among the at least one IAB MT served by the first host node receives the first registration request feedback information corresponding to the IAB MT from the first host node. Optionally, the IAB MT among the at least one IAB MT served by the first host node communicates with the remote server through the PDU session according to the first registration request feedback information to implement the download of the second service function authorized for registration.

[0211] Optionally, any IAB MT of the at least one IAB MT served by the first host node may send first registration request information to the first host node through an RRC message, and the first host node may send first registration request feedback information to the at least one IABMT through an RRC message.

[0212] Exemplarily, after the first host node receives the first registration request information from at least one IAB MT served by the first host node, the first host node sends the first registration request information corresponding to the at least one IAB MT served by the first host node to the AMF; correspondingly, the AMF receives the first registration request information corresponding to the at least one IAB MT from the first host node. Based on the first registration request information, the AMF sends the first registration request feedback information corresponding to the at least one IABMT to the first host node; correspondingly, the first host node receives the first registration request feedback information from the AMF, and sends the first registration request feedback information to the at least one IAB MT served by the first host node.

[0213] Optionally, the first registration request information includes at least one item of identification information, service type information, and service status information corresponding to at least one second service function; the first registration request feedback information includes identification information corresponding to the second service function for which authorization for registration is authorized, and / or identification information corresponding to the second service function for which authorization for registration is refused.

[0214] Optionally, the first registration request feedback information includes reason information for refusal of authorization corresponding to the second service function for which authorization registration is refused. Exemplarily, the first registration request feedback information includes identification information corresponding to the second service function for which authorization registration is refused, and reason information for refusal of authorization corresponding to the second service function for which authorization registration is refused. Exemplarily, the first registration request feedback information includes identification information corresponding to the second service function for which authorization registration is refused, identification information corresponding to the second service function for which authorization registration is refused, and reason information for refusal of authorization corresponding to the second service function for which authorization registration is refused.

[0215] 1203, at least one IAB MT served by the second host node sends second registration request information to the second host node respectively, where the second registration request information is used to indicate at least one fourth service function that the IAB MT requests to register; correspondingly, the second host node receives the second registration request information from at least one IAB MT served by the second host node.

[0216] 1204, the second host node sends second registration request feedback information to at least one IAB MT served by the second host node, respectively, and the second registration request feedback information is used to indicate the fourth service function authorized for registration and / or the fourth service function refused to be authorized for registration among the at least one fourth service function requested to be registered by the IAB MT. The IAB MT among the at least one IAB MT served by the second host node receives the second registration request feedback information corresponding to the IAB MT from the second host node. Optionally, the IAB MT among the at least one IAB MT served by the second host node communicates with the remote server through the PDU session according to the second registration request feedback information to implement the download of the fourth service function authorized for registration.

[0217] Optionally, any IAB MT of the at least one IAB MT served by the second host node may send second registration request information to the second host node through an RRC message, and the second host node may send second registration request feedback information to the at least one IABMT through an RRC message.

[0218] Exemplarily, after the second host node receives the second registration request information from at least one IAB MT served by the second host node, the second host node sends the second registration request information corresponding to the at least one IAB MT served by the second host node to the AMF; correspondingly, the AMF receives the second registration request information corresponding to the at least one IAB MT from the second host node. Based on the second registration request information, the AMF sends the second registration request feedback information corresponding to the at least one IABMT to the second host node; correspondingly, the second host node receives the second registration request feedback information from the AMF, and sends the second registration request feedback information to the at least one IAB MT served by the second host node.

[0219] Optionally, the second registration request information includes at least one item of identification information, service type information, and service status information corresponding to at least one fourth service function; the second registration request feedback information includes identification information corresponding to the fourth service function for authorized registration, and / or identification information corresponding to the fourth service function for rejected authorization registration.

[0220] Optionally, the second registration request feedback information includes reason information for refusal of authorization corresponding to the fourth service function for which authorization registration is refused. Exemplarily, the second registration request feedback information includes identification information corresponding to the fourth service function for which authorization registration is refused, and reason information for refusal of authorization corresponding to the fourth service function for which authorization registration is refused. Exemplarily, the second registration request feedback information includes identification information corresponding to the fourth service function for which authorization registration is refused, identification information corresponding to the fourth service function for which authorization registration is refused, and reason information for refusal of authorization corresponding to the fourth service function for which authorization registration is refused.

[0221] Exemplarily, the service type indicated by the service type information includes AI, perception, positioning, or computing service types. Exemplarily, the state information indicated by the service state information includes stateful and stateless.

[0222] Optionally, step 1203 may be executed before step 1201, or step 1201 and step 1203 may be executed simultaneously; similarly, step 1204 may be executed before step 1202, or step 1202 and step 1204 may be executed simultaneously, and this application does not limit this.

[0223] 1205. The first host node sends first indication information to the second host node, where the first indication information indicates at least one first service function supported by the IAB MT included in at least one IAB node served by the first host node; correspondingly, the second host node receives the first indication information from the first host node.

[0224] 1206, the second host node sends second indication information to the first host node, the second indication information indicating at least one third service function supported by the IAB MT included in at least one IAB node served by the second host node; correspondingly, the first host node receives the second indication information from the second host node. Exemplarily, the first host node and the second host node interact via an Xn interface. The first host node can learn the service functions supported in the topology of the second host node according to the second indication information.

[0225] Optionally, at least one first service function includes the above-mentioned second service function of authorization registration, and at least one third service function includes the above-mentioned fourth service function of authorization registration.

[0226] 1207, the first host node sends second service function list information to the terminal device, the second service function list information indicates at least one first service function supported by the IAB MT included in at least one IAB node served by the first host node and at least one third service function supported by the IAB MT included in at least one IAB node served by the second host node. Correspondingly, the terminal device receives the second service function list information from the first host node, wherein the at least one third service function includes the first service function, the at least one IAB node served by the second host node includes the first IAB node, the first IAB node includes the first IAB MT, and the first IAB MT has the first service function. The terminal device can learn which service functions can be provided by the terminal device through the first host node based on the second service function list information.

[0227] Optionally, at least one IAB MT served by the first host node sends a first service configuration update request message to the first host node, the first service configuration update request message is used to request to update the service function list of the IAB MT, and the first service configuration update request message includes at least one of the following: identification information corresponding to the service function requested to be added, identification information corresponding to the service function requested to be deleted, or identification information and service parameter information corresponding to the service function requested to be updated. The first host node receives the first service configuration update request message from at least one IAB MT served by the first host node; the first host node sends a first service configuration update response message to at least one IAB MT served by the first host node according to the first service configuration update request message of at least one IAB MT, the first service configuration update response message includes at least one of the following: identification information corresponding to the service function authorized to be added, identification information corresponding to the service function authorized to be deleted, or identification information corresponding to the service function authorized to be updated. The IAB MT receives the first service configuration update response message from the first host node. Optionally, the IAB MT communicates with a remote server through a PDU session according to the first service configuration update response message to implement downloading of the authorized added service function and / or updating of the authorized updated service function.

[0228] Optionally, the first service configuration update response information may include at least one of the following: identification information corresponding to a service function for which authorization is refused to be added, identification information corresponding to a service function for which authorization is refused to be deleted, or identification information corresponding to a service function for which authorization is refused to be updated. This application does not limit this.

[0229] Optionally, at least one IAB MT served by the second host node sends a second service configuration update request message to the second host node, the second service configuration update request message is used to request to update the service function list of the IAB MT, and the second service configuration update request message includes at least one of the following: identification information corresponding to the service function requested to be added, identification information corresponding to the service function requested to be deleted, or identification information and service parameter information corresponding to the service function requested to be updated. The second host node receives the second service configuration update request message from at least one IAB MT served by the second host node; the second host node sends a second service configuration update response message to at least one IAB MT served by the second host node according to the second service configuration update request message of at least one IAB MT, the second service configuration update response message includes at least one of the following: identification information corresponding to the service function authorized to be added, identification information corresponding to the service function authorized to be deleted, or identification information corresponding to the service function authorized to be updated. The IAB MT receives the second service configuration update response message from the second host node. Optionally, the IAB MT communicates with the remote server through a PDU session according to the second service configuration update response message to implement downloading of the authorized added service function and / or updating of the authorized updated service function.

[0230] Optionally, the second service configuration update response information may include at least one of the following: identification information corresponding to a service function for which authorization is refused to be added, identification information corresponding to a service function for which authorization is refused to be deleted, or identification information corresponding to a service function for which authorization is refused to be updated. This application does not limit this.

[0231] 1208. The terminal device sends first information to the first host node, where the first information is used to request to provide a first service function for the terminal device. Correspondingly, the first host node receives the first information from the terminal device.

[0232] 1209. The first host node determines, based on the first information, that the first IAB MT included in the first IAB node served by the second host node has the first service function. The first host node sends service request information to the second host node, where the service request information is used to request that the first service function be provided to the terminal device. Correspondingly, the second host node receives the service request information from the first host node.

[0233] 1210. The second host node sends fourth information to the first IAB MT according to the service request information. The fourth information is used to request the first IAB MT to provide the first service function for the terminal device. The first IAB MT has the first service function. Correspondingly, the first IAB MT receives the fourth information from the second host node.

[0234] 1211, the first IAB MT determines whether to provide the first service function for the terminal device according to the current load; if the first IAB MT provides the first service function for the terminal device according to the current determination, the first IAB MT sends fifth information to the second host node, and the fifth information is used to indicate that the first IAB MT is allowed to provide the first service function for the terminal device; correspondingly, the second host node receives the fifth information from the first IAB MT. For example, when the current load of the first IAB MT is small, the first IAB MT determines to provide the first service function for the terminal device; when the current load of the first IAB MT is large, the first IABMT determines not to provide the first service function for the terminal device.

[0235] 1212. The second host node sends service request response information to the first host node according to the fifth information. The service request response information is used to indicate that the first IAB MT allows providing the first service function for the terminal device. Correspondingly, the first host node receives the service request response information from the second host node.

[0236] 1213. The first host node determines, based on the service request response information, a second data transmission path between the terminal device and the first host node, second quality of service requirement information corresponding to the first service function within the topology of the first host node, and third quality of service requirement information corresponding to the first service function within the topology of the second host node; the first host node determines, based on the second data transmission path, the second quality of service requirement information, and the third quality of service requirement information, the third configuration information indicating a correspondence between a third bearer DRB identifier and a third BAP routing identifier, the second IAB node includes a second IAB DU, the second IAB node is an access IAB node of the terminal device, and the at least one IAB node served by the first host node includes the second IAB node.

[0237] 1214. The first host node sends third configuration information to the second IAB DU. Correspondingly, the second IAB DU receives the third configuration information from the first host node.

[0238] 1215, the first host node sends management request information to the second host node, the management request information includes the third service quality requirement information corresponding to the first service function in the topology of the second host node, the first identification information allocated by the first host node to the first IABMT, the transmission network layer information corresponding to the DU included in the first host node, and the third BAP routing identification information. Correspondingly, the second host node receives the management request information from the first host node. The management request information sent by the first host node to the second host node is used to open up a data channel between the first host node and the second host node.

[0239] 1216. The second host node determines a third data transmission path and third service quality requirement information between the second host node and the first IAB MT based on the management request information from the first host node. The second host node determines fourth configuration information based on the third data transmission path and the third service quality requirement information. The fourth configuration information indicates a correspondence between a fourth DRB identifier and a fourth BAP routing identifier. The first IAB node served by the second host node includes a first IAB MT and a first IAB DU.

[0240] 1217: The second host node sends fourth configuration information to the first IAB DU. Correspondingly, the first IAB DU receives the fourth configuration information from the second host node.

[0241] 1218. The second host node sends first RRC reconfiguration information to the first IAB MT according to the management request information from the first host node. The first RRC reconfiguration information indicates PDCP configuration information and / or SDAP configuration information corresponding to the first IAB MT. The PDCP configuration information corresponding to the first IAB MT is the same as the PDCP configuration information corresponding to the terminal device. The SDAP configuration information corresponding to the first IABMT is the same as the SDAP configuration information corresponding to the terminal device. Correspondingly, the first IAB MT receives the first RRC reconfiguration information from the second host node.

[0242] 1219, the second host node sends management request response information to the first host node, where the management request response information includes the second identification information allocated by the second host node to the first IAB MT, the transmission network layer information corresponding to the DU included in the second host node, and the fourth BAP routing identification information. Correspondingly, the first host node receives the management request response information from the second host node.

[0243] 1220. The first host node establishes the context of the terminal device at the second IAB DU according to the management request response information from the second host node. There is no need to establish an F1-U tunnel for the DRB. Therefore, the data does not need to pass through the CU of the first host node.

[0244] 1221. The first host node sends second RRC reconfiguration information to the terminal device according to the management request response information from the second host node. The second RRC reconfiguration information indicates the PDCP configuration information and / or SDAP configuration information corresponding to the terminal device. The PDCP configuration information corresponding to the first IAB MT is the same as the PDCP configuration information corresponding to the terminal device. The SDAP configuration information corresponding to the first IABMT is the same as the SDAP configuration information corresponding to the terminal device. Correspondingly, the terminal device receives the second RRC reconfiguration information from the first host node.

[0245] Optionally, the management request information also includes third indication information, which indicates the PDCP configuration information and / or SDAP configuration information corresponding to the first IAB MT; or, the management request response information also includes fourth indication information, which indicates the PDCP configuration information and / or SDAP configuration information corresponding to the terminal device.

[0246] 1222. The terminal device communicates with the first IAB MT, so that the first IAB MT provides the first service function for the terminal device.

[0247] The above introduces the communication method provided in the embodiment of the present application, and the execution subject used to execute the above communication method will be introduced below.

[0248] Fig.13 1 is a schematic block diagram of a communication device 1300 according to an embodiment of the present application. The device can be applied to or deployed in Figure 7 or Fig. 9 In the first host node of the method embodiment. The communication device 1300 includes:

[0249] The transceiver unit 1310 is configured to receive first information, where the first information is used to request that a first service function be provided for a terminal device;

[0250] The transceiver unit 1310 is further configured to send first configuration information to a first IAB DU according to the first information, wherein the first configuration information indicates a correspondence between a first DRB identifier and a first BAP routing identifier, the first IAB node includes the first IAB DU and a first IAB MT, and the first IAB MT has the first service function;

[0251] The transceiver unit 1310 is further configured to send second configuration information to a second IAB DU according to the first information, wherein the second configuration information indicates a correspondence between a second DRB identifier and a second BAP routing identifier, the second IAB node includes the second IAB DU, and the second IAB node is an access IAB node of the terminal device;

[0252] The transceiver unit 1310 is further configured to, according to the first information, send first radio resource control RRC reconfiguration information to the first IAB MT and the terminal device respectively, where the first RRC reconfiguration information indicates PDCP configuration information and / or SDAP configuration information.

[0253] Optionally, the communication device 1300 further includes: a processing unit 1320, configured to determine, according to the first information, a first data transmission path between the terminal device and the first IAB MT and first service quality requirement information corresponding to the first service function in the topology of the communication device;

[0254] The processing unit 1320 is further configured to determine the first configuration information and the second configuration information according to the first data transmission path and the first quality of service requirement information.

[0255] Optionally, the transceiver unit 1310 is further used to: send second information to the first IAB MT according to the first information, the second information being used to request that the first service function be provided for the terminal device; and receive third information from the first IAB MT, the third information being used to indicate that the first IAB MT allows the first service function to be provided for the terminal device.

[0256] Optionally, the transceiver unit 1310 is specifically used to receive the first information from the terminal device.

[0257] Optionally, the transceiver unit 1310 is also used to send first service function list information to the terminal device, wherein the first service function list information indicates at least one first service function supported by the IAB MT included in at least one IAB node served by the communication device, wherein the at least one first service function includes the first service function, and the at least one IAB node includes the first IAB node.

[0258] Optionally, the transceiver unit 1310 is specifically used to receive the first information from the access and mobility management function AMF.

[0259] Optionally, the transceiver unit 1310 is further used to: receive registration request information from at least one IAB MT, the registration request information being used to indicate at least one second service function requested to be registered by the IAB MT, and the at least one IAB MT including the first IAB MT; and send registration request feedback information to the at least one IAB MT respectively, the registration request feedback information being used to indicate the second service function authorized for registration and / or the second service function refused to be authorized for registration among the at least one second service function requested to be registered by the IAB MT, wherein the at least one first service function includes the second service function authorized for registration.

[0260] Optionally, the transceiver unit 1310 is also used to: send the registration request information to the AMF; and receive the registration request feedback information from the AMF.

[0261] Optionally, the registration request information includes at least one item of identification information, service type information, or service status information corresponding to the at least one second service function; the registration request feedback information includes identification information corresponding to the second service function for which authorization registration is authorized, and / or identification information corresponding to the second service function for which authorization registration is refused.

[0262] Optionally, the registration request feedback information includes reason information for refusing authorization corresponding to the second service function for which authorization registration is refused.

[0263] Fig.14 FIG. 1 is a schematic block diagram of another communication device 1400 according to an embodiment of the present application. The device can be applied to or deployed in Fig.10 or Fig.12 In the first host node of the method embodiment. The communication device 1400 includes:

[0264] The transceiver unit 1410 is configured to receive first information, where the first information is used to request that a first service function be provided to a terminal device;

[0265] The transceiver unit 1410 is further configured to, according to the first information, send third configuration information to the second IAB DU, where the third configuration information indicates a correspondence between a third bearer DRB identifier and a third BAP routing identifier, the second IAB node includes the second IAB DU, the second IAB node is an access IAB node of the terminal device, and the at least one IAB node served by the communication device includes the second IAB node;

[0266] The transceiver unit 1410 is further used to send management request information to the second host node, the management request information including the third service quality requirement information corresponding to the first service function in the topology of the second host node, the first identification information allocated by the communication device to the first IAB MT, the transmission network layer information corresponding to the DU included in the communication device, and the information of the third BAP routing identifier, the first IAB node served by the second host node includes the first IAB MT, and the first IAB MT has the first service function;

[0267] The transceiver unit 1410 is further configured to receive management request response information from the second host node, the management request response information including second identification information allocated by the second host node to the first IAB MT, transmission network layer information corresponding to the DU included in the second host node, and information of a fourth BAP routing identifier corresponding to the first IAB DU, and the first IAB node also includes the first IAB DU;

[0268] The transceiver unit 1410 is also used to send second RRC reconfiguration information to the terminal device according to the management request response information, the second RRC reconfiguration information indicating PDCP configuration information and / or SDAP configuration information, the PDCP configuration information corresponding to the terminal device is the same as the PDCP configuration information corresponding to the first IAB MT, and the SDAP configuration information corresponding to the terminal device is the same as the SDAP configuration information corresponding to the first IAB MT.

[0269] Optionally, the communication device 1400 further includes: a processing unit 1420, configured to determine, according to the first information, a second data transmission path between the terminal device and the communication device, second service quality requirement information corresponding to the first service function in the topology of the communication device, and the third service quality requirement information;

[0270] The processing unit 1420 is further configured to determine the third configuration information according to the second data transmission path, the second quality of service requirement information and the third quality of service requirement information.

[0271] Optionally, the transceiver unit 1410 is also used to: send service request information to the second host node according to the first information, the service request information being used to request that the first service function be provided to the terminal device; and receive service request response information from the second host node, the service request response information being used to indicate that the first IAB MT allows the first service function to be provided to the terminal device.

[0272] Optionally, the transceiver unit 1410 is also used to: send first indication information to the second host node, the first indication information indicating at least one first service function supported by the IAB MT included in at least one IAB node served by the communication device; receive second indication information from the second host node, the second indication information indicating at least one third service function supported by the IAB MT included in at least one IAB node served by the second host node, wherein the at least one third service function includes the first service function, and the at least one IAB node served by the second host node includes the first IAB node.

[0273] Optionally, the transceiver unit 1410 is specifically used to receive the first information from the terminal device.

[0274] Optionally, the transceiver unit 1410 is also used to send second service function list information to the terminal device, wherein the second service function list information indicates at least one first service function supported by the IAB MT included in at least one IAB node served by the communication device and at least one third service function supported by the IAB MT included in at least one IAB node served by the second host node.

[0275] Optionally, the transceiver unit 1410 is specifically used to receive the first information from AMF.

[0276] Fig.15 FIG. 1 is a schematic block diagram of another communication device 1500 according to an embodiment of the present application. The device can be applied to or deployed in Fig.10 or Fig.12 In the second host node in the method embodiment. The communication device 1500 includes:

[0277] The transceiver unit 1510 is configured to receive management request information from a first host node, wherein the management request information includes third service quality requirement information corresponding to a first service function in the topology of the communication device, first identification information allocated by the first host node to a first IAB MT, transmission network layer information corresponding to a DU included in the first host node, and information of a third BAP routing identifier corresponding to a second IAB DU served by the first host node, wherein the first IAB node served by the communication device includes the first IAB MT, and the first IAB MT has the first service function, wherein the second IAB node served by the first host node includes the second IAB DU, and the second IAB node is an access IAB node of a terminal device;

[0278] The transceiver unit 1510 is further configured to send fourth configuration information to the first IAB DU according to the management request information, wherein the fourth configuration information indicates a correspondence between a fourth DRB identifier and a fourth BAP routing identifier, and the first IAB node also includes the first IAB DU;

[0279] The transceiver unit 1510 is further configured to send first RRC reconfiguration information to the first IAB MT according to the management request information, where the first RRC reconfiguration information indicates PDCP configuration information and / or SDAP configuration information, the PDCP configuration information corresponding to the first IABMT is the same as the PDCP configuration information corresponding to the terminal device, and the SDAP configuration information corresponding to the first IAB MT is the same as the SDAP configuration information corresponding to the terminal device;

[0280] The transceiver unit 1510 is further used to send management request response information to the first host node, wherein the management request response information includes the second identification information allocated by the communication device to the first IAB MT, the transmission network layer information corresponding to the DU included in the communication device, and the fourth BAP routing identification information.

[0281] Optionally, the communication device 1500 further includes: a processing unit 1520, configured to determine a third data transmission path and the third service quality requirement information between the communication device and the first IAB MT according to the management request information;

[0282] The processing unit 1520 is further configured to determine the fourth configuration information according to the third data transmission path and the third quality of service requirement information.

[0283] Optionally, the transceiver unit 1510 is also used to: receive service request information from the first host node, the service request information being used to request that the first service function be provided to the terminal device; send fourth information to the first IAB MT based on the service request information, the fourth information being used to request that the first IAB MT provide the first service function to the terminal device; receive fifth information from the first IAB MT, the fifth information being used to indicate that the first IAB MT allows the first service function to be provided to the terminal device; and send service request response information to the first host node based on the fifth information, the service request response information being used to indicate that the first IAB MT allows the first service function to be provided to the terminal device.

[0284] Optionally, the transceiver unit 1510 is also used to: receive first indication information from the communication device, the first indication information indicating at least one first service function supported by the IAB MT included in at least one IAB node served by the first host node; receive second indication information sent to the communication device, the second indication information indicating at least one third service function supported by the IAB MT included in at least one IAB node served by the communication device, wherein the at least one third service function includes the first service function, and the at least one IAB node served by the communication device includes the first IAB node.

[0285] Fig.16 1 is a schematic block diagram of another communication device 1600 according to an embodiment of the present application. The communication device 1600 includes:

[0286] The processor 1610 and the transceiver 1620 are used to receive computer codes or instructions and transmit them to the processor 1610, and the processor 1610 runs the computer codes or instructions to implement the method in the embodiment of the present application. The communication device can be the first host node or the second host node in the embodiment of the present application.

[0287] The processor 1610 described above may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by an integrated logic circuit of hardware in the processor or an instruction in the form of software. The above processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in a decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0288] An embodiment of the present application provides a communication system, including: a first host node in the communication method provided in the embodiment of the present application and other communication devices communicating with the first host node, a second host node and other communication devices communicating with the second host node.

[0289] An embodiment of the present application provides another communication system, including: the first host node, a terminal device, a first IAB node, and a second IAB node in the communication method provided in the embodiment of the present application.

[0290] An embodiment of the present application provides another communication system, including: the first host node, the second host node, the terminal device, the first IAB node and the second IAB node in the communication method provided in the embodiment of the present application.

[0291] The present application also provides a computer-readable storage medium on which a computer program for implementing the method in the above method embodiment is stored. When the computer program is executed on a computer or processor, the computer can implement the method in the above method embodiment.

[0292] An embodiment of the present application further provides a computer program product, which includes a computer program code. When the computer program code runs on a computer, the method in the above method embodiment is executed.

[0293] An embodiment of the present application also provides a chip, including a processor, wherein the processor is connected to a memory, the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the chip executes the method in the above method embodiment.

[0294] It should be understood that in the embodiments of the present application, the numbers "first", "second"... are only for distinguishing different objects, such as distinguishing different host nodes or different information, and do not constitute a limitation on the scope of the embodiments of the present application. The embodiments of the present application are not limited to this.

[0295] In addition, the term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the objects associated before and after are in an "or" relationship; the term "at least one" in this application can mean "one" and "two or more". For example, A, B and C can represent seven situations: A exists alone, B exists alone, C exists alone, A and B exist at the same time, A and C exist at the same time, C and B exist at the same time, and A, B and C exist at the same time.

[0296] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0297] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0298] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0299] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0300] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0301] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks.

[0302] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: include: The first host node receives first information, where the first information is used to request to provide a first service function for the terminal device; The first host node sends first configuration information to a first access backhaul integrated IAB distributed unit DU according to the first information, wherein the first configuration information indicates a correspondence between a first data radio bearer DRB identifier and a first backhaul adaptation protocol BAP routing identifier, and the first IAB node includes the first IAB DU and a first IAB mobile terminal MT, and the first IAB MT has the first service function; The first host node sends second configuration information to the second IAB DU according to the first information, where the second configuration information indicates a correspondence between a second DRB identifier and a second BAP routing identifier, the second IAB node includes the second IABDU, and the second IAB node is an access IAB node of the terminal device; The first host node sends first radio resource control RRC reconfiguration information to the first IAB MT and the terminal device respectively according to the first information, where the first RRC reconfiguration information indicates packet data convergence protocol PDCP configuration information and / or service data adaptation protocol SDAP configuration information.

2. The method according to claim 1, characterized in that The method further comprises: The first host node determines, according to the first information, a first data transmission path between the terminal device and the first IAB MT and first service quality requirement information corresponding to the first service function in the topology of the first host node; The first host node determines the first configuration information and the second configuration information according to the first data transmission path and the first quality of service requirement information.

3. The method according to claim 1 or 2, characterized in that: The method further comprises: The first host node sends second information to the first IAB MT according to the first information, where the second information is used to request to provide the first service function for the terminal device; The first host node receives third information from the first IAB MT, where the third information is used to indicate that the first IAB MT is allowed to provide the first service function for the terminal device.

4. The method according to any one of claims 1 to 3, characterized in that The first host node receives the first information, including: The first host node receives the first information from the terminal device.

5. The method according to claim 4, characterized in that The method further comprises: The first host node sends first service function list information to the terminal device, wherein the first service function list information indicates at least one first service function supported by the IAB MT included in at least one IAB node served by the first host node, wherein the at least one first service function includes the first service function, and the at least one IAB node includes the first IAB node.

6. The method according to any one of claims 1 to 3, characterized in that The first host node receives the first information, including: The first host node receives the first information from an access and mobility management function AMF.

7. The method according to any one of claims 1 to 6, characterized in that The method further comprises: The first host node receives registration request information from at least one IAB MT, where the registration request information is used to indicate at least one second service function that the IAB MT requests to register, and the at least one IAB MT includes the first IAB MT; The first host node sends registration request feedback information to the at least one IAB MT respectively, where the registration request feedback information is used to indicate the second service function authorized for registration and / or the second service function refused to be authorized for registration among the at least one second service function requested to be registered by the IAB MT, wherein the at least one first service function includes the second service function authorized for registration.

8. The method according to claim 7, characterized in that The method further comprises: The first host node sends the registration request information to the AMF; The first host node receives the registration request feedback information from the AMF.

9. The method according to claim 7 or 8, characterized in that: The registration request information includes at least one of identification information, service type information, or service status information corresponding to the at least one second service function; The registration request feedback information includes identification information corresponding to the second service function for the authorized registration and / or identification information corresponding to the second service function for the rejected authorized registration.

10. The method according to any one of claims 7 to 9, characterized in that The registration request feedback information includes reason information for refusing authorization corresponding to the second service function for which the registration authorization is refused.

11. A method of communication, characterized in that: include: The first host node receives first information, where the first information is used to request to provide a first service function for the terminal device; The first host node sends third configuration information to the second IAB DU according to the first information, where the third configuration information indicates a correspondence between a third bearer DRB identifier and a third BAP routing identifier, the second IAB node includes the second IABDU, the second IAB node is an access IAB node of the terminal device, and the at least one IAB node served by the first host node includes the second IAB node; The first host node sends management request information to the second host node, the management request information including third service quality requirement information corresponding to the first service function in the topology of the second host node, first identification information allocated by the first host node to the first IAB MT, transmission network layer information corresponding to the DU included in the first host node, and information of the third BAP routing identifier, the first IAB node served by the second host node includes the first IABMT, and the first IAB MT has the first service function; The first host node receives management request response information from the second host node, the management request response information including second identification information allocated by the second host node to the first IAB MT, transmission network layer information corresponding to the DU included in the second host node, and information of a fourth BAP routing identifier corresponding to the first IAB DU, and the first IAB node also includes the first IAB DU; The first host node sends second RRC reconfiguration information to the terminal device based on the management request response information, and the second RRC reconfiguration information indicates PDCP configuration information and / or SDAP configuration information, the PDCP configuration information corresponding to the terminal device is the same as the PDCP configuration information corresponding to the first IAB MT, and the SDAP configuration information corresponding to the terminal device is the same as the SDAP configuration information corresponding to the first IAB MT.

12. The method according to claim 11, characterized in that The method further comprises: The first host node determines, based on the first information, a second data transmission path between the terminal device and the first host node, second quality of service requirement information corresponding to the first service function in the topology of the first host node, and the third quality of service requirement information; The first host node determines the third configuration information according to the second data transmission path, the second quality of service requirement information and the third quality of service requirement information.

13. The method according to claim 11 or 12, characterized in that: The method further comprises: The first host node sends service request information to the second host node according to the first information, where the service request information is used to request to provide the first service function for the terminal device; The first host node receives service request response information from the second host node, where the service request response information is used to indicate that the first IAB MT allows providing the first service function for the terminal device.

14. The method according to any one of claims 11 to 13, characterized in that The method further comprises: The first host node sends first indication information to the second host node, where the first indication information indicates at least one first service function supported by the IAB MT included in at least one IAB node served by the first host node; The first host node receives second indication information from the second host node, the second indication information indicating at least one third service function supported by the IAB MT included in at least one IAB node served by the second host node, wherein the at least one third service function includes the first service function, and the at least one IAB node served by the second host node includes the first IAB node.

15. The method according to any one of claims 11 to 14, characterized in that The first host node receives the first information, including: The first host node receives the first information from the terminal device.

16. The method according to claim 15, characterized in that The method further comprises: The first host node sends second service function list information to the terminal device, wherein the second service function list information indicates at least one first service function supported by the IAB MT included in at least one IAB node served by the first host node and at least one third service function supported by the IAB MT included in at least one IAB node served by the second host node.

17. The method according to any one of claims 11 to 14, characterized in that The first host node receives the first information, including: The first host node receives the first information from the AMF.

18. A method of communication, characterized in that: include: The second host node receives management request information from the first host node, the management request information including third service quality requirement information corresponding to the first service function in the topology of the second host node, first identification information allocated by the first host node to the first IAB MT, transmission network layer information corresponding to the DU included in the first host node, and information of a third BAP routing identifier corresponding to the second IAB DU served by the first host node, the first IAB node served by the second host node includes the first IAB MT, the first IAB MT has the first service function, wherein the second IAB node served by the first host node includes the second IAB DU, and the second IAB node is an access IAB node of a terminal device; The second host node sends fourth configuration information to the first IAB DU according to the management request information, wherein the fourth configuration information indicates a correspondence between a fourth DRB identifier and a fourth BAP routing identifier, and the first IAB node also includes the first IAB DU; The second donor node sends first RRC reconfiguration information to the first IAB MT according to the management request information, where the first RRC reconfiguration information indicates PDCP configuration information and / or SDAP configuration information, the PDCP configuration information corresponding to the first IAB MT is the same as the PDCP configuration information corresponding to the terminal device, and the SDAP configuration information corresponding to the first IAB MT is the same as the SDAP configuration information corresponding to the terminal device; The second host node sends management request response information to the first host node, and the management request response information includes the second identification information allocated by the second host node to the first IAB MT, the transmission network layer information corresponding to the DU included in the second host node, and the fourth BAP routing identification information.

19. The method according to claim 18, characterized in that The method further comprises: The second host node determines, according to the management request information, a third data transmission path and the third quality of service requirement information between the second host node and the first IAB MT; The second host node determines the fourth configuration information according to the third data transmission path and the third quality of service requirement information.

20. The method according to claim 18 or 19, characterized in that The method further comprises: The second host node receives service request information from the first host node, where the service request information is used to request to provide the first service function for the terminal device; The second host node sends fourth information to the first IAB MT according to the service request information, where the fourth information is used to request the first IAB MT to provide the first service function for the terminal device; The second host node receives fifth information from the first IAB MT, where the fifth information is used to indicate that the first IAB MT allows providing the first service function for the terminal device; The second host node sends service request response information to the first host node according to the fifth information, where the service request response information is used to indicate that the first IAB MT allows providing the first service function for the terminal device.

21. The method according to any one of claims 18 to 20, characterized in that The method further comprises: The second host node receives first indication information from the second host node, where the first indication information indicates at least one first service function supported by an IAB MT included in at least one IAB node served by the first host node; The second host node receives second indication information sent to the second host node, wherein the second indication information indicates at least one third service function supported by the IAB MT included in at least one IAB node served by the second host node, wherein the at least one third service function includes the first service function, and the at least one IAB node served by the second host node includes the first IAB node.

22. A communication device, characterized in that: Comprising means for performing the method as claimed in any one of claims 1 to 21.

23. A communication device, characterized in that: include: A processor and a transceiver, wherein the transceiver is used to receive computer codes or instructions and transmit the instructions to the processor, and the processor runs the computer codes or instructions so that the method according to any one of claims 1 to 21 is executed.

24. A communication system, characterized in that: include: A first host node and a second host node, wherein the first host node is used to implement the method according to any one of claims 11 to 17, and the second host node is used to implement the method according to any one of claims 18 to 21.

25. A computer-readable storage medium, characterized in that: include: The computer readable medium stores a computer program; When the computer program is run on a computer or a processor, the method according to any one of claims 1 to 21 is executed.

26. A computer program product, characterized in that A computer program is included which, when executed, causes the method according to any one of claims 1 to 21 to be implemented.

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