Communication method and related equipment

Abstract

The invention relates to a communication method and related equipment, which are used for determining an identifier of a first central unit (CU) connected with a mobile terminal (MT) in a mobile access and backhaul (mIAB) node through information sent by a distributed unit (DU) connected with the mIAB node, and realizing data transmission of the mIAB node in a topology of the first CU on the basis of the identifier of the first CU. In the method, a DU determines first information, the first information is used for determining an identifier of a first CU, the DU connected with the first CU comprises a first cell, and the first cell is a cell supporting access of an mIAB node; wherein the identifier of the first CU is used for establishing data transmission in the topology of the first CU for the mIAB node accessing the first cell; and the DU sends the first information.

Description

Technical Field

[0001] The present application relates to the field of wireless technology, and in particular to a communication method and related equipment. Background Art

[0002] In the communication system, the integrated access and backhaul (IAB) technology enables both the access link and the backhaul link to adopt wireless transmission solutions, which can reduce the deployment of optical fibers and reduce costs.

[0003] At present, in the IAB network architecture, an IAB donor node and an IAB node may be included. An IAB node may include a mobile terminal (MT) and a distributed unit (DU). For an IAB node, the IAB node may realize data transmission through a communication connection with a centralized unit (CU).

[0004] In addition, a communication connection may be established between the DU and the CU in the IAB node, and another communication connection may be established between the MT and the CU in the IAB node. For example, the one communication connection may be used for data transmission of a child node of the IAB node (e.g., a terminal device or an MT in a next-hop IAB node), and the other communication connection may be used for data transmission of the MT of the IAB node. Generally, the CU to which the DU in the IAB node is connected and the CU to which the MT in the IAB node is connected are the same CU.

[0005] However, in order to improve the flexibility of network deployment, the CU connected to the DU in the IAB node and the CU connected to the MT in the IAB node may not be the same CU. In this case, how to realize data transmission of the IAB node is a technical problem that needs to be solved urgently. Summary of the invention

[0006] The present application provides a communication method and related equipment, which are used to determine the identifier of a first CU connected to an MT in a mobile integrated access and backhaul (mIAB) node through information sent by a DU connected to the mIAB node, and to implement data transmission of the mIAB node in the topology of the first CU based on the identifier of the first CU.

[0007] In a first aspect, the present application provides a communication method, which is executed by a DU, or the method is executed by some components in the DU (such as a processor, a chip or a chip system, etc.), or the method can also be implemented by a logic module or software that can implement all or part of the DU functions. In the first aspect and its possible implementation, the communication method is described as being executed by the DU. In the method, the DU determines first information, and the first information is used to determine the identifier of the first CU. The DU connected to the first CU includes a first cell, and the first cell is a cell that supports the access of the mAB node; wherein the identifier of the first CU is used to establish data transmission in the topology of the first CU for the mAB node accessing the first cell; the DU sends the first information.

[0008] Based on the above technical solution, the first information sent by the DU is used to determine the identifier of the first CU connected to the DU, and the identifier of the first CU is used to establish data transmission in the topology of the first CU for the mAB node accessing the first cell. Among them, the first cell included in the DU is a cell that supports the access of the mAB node, that is, the first CU connected to the DU is the CU connected to the MT in the mAB node. In other words, after the DU sends the first information, the MT in the mAB node can determine the identifier of the first CU based on the first information, and the subsequent DU in the mAB node can establish data transmission in the topology of the first CU based on the identifier of the first CU. Thus, in the case where the CU connected to the DU in the mAB node and the CU connected to the MT in the mAB node are not the same CU, the mAB node can determine the identifier of the first CU connected to the MT in the mAB node based on the information sent by the DU connected to the mAB node, and implement data transmission of the mAB node in the topology of the first CU based on the identifier of the first CU.

[0009] In the present application, the mIAB node can be understood as an IAB node with mobility. For example, with the ground as the reference system, the mIAB node can be an IAB node that may be mobile relative to the ground, such as a vehicle-mounted device, a mobile station, a mobile station, etc. Among them, the mIAB node can be replaced by an IAB node with mobility, an IAB node with mobility attributes, etc. Among them, under the condition that an IAB node has mobility (or mobility attributes), or an IAB node is in the process of moving, the IAB node can be called an mIAB node. Correspondingly, an mIAB node with mobility (or mobility attributes) may not move (for example, no displacement relative to the ground reference system), or an mIAB node with mobility (or mobility attributes) may not have sent an indication information indicating that the node is an mIAB node. In this case, the mobility attribute of the mIAB node can be regarded as the attribute or capability of the mIAB node, that is, the mIAB node can also be called an IAB node (or an ordinary IAB node, an immobile IAB node, etc.). In other words, the mIAB node in the present application may be replaced by an IAB node (or a common IAB node, a non-mobile IAB node, etc.).

[0010] Optionally, the identifier of the first CU may be an identifier of a network device where the first CU is located. For example, in a new radio (NR) system, the network device where the first CU is located may be a gNB, that is, the identifier of the network device where the first CU is located may be an identifier of the gNB (for example, a gNB ID and / or an IP address).

[0011] It should be understood that the DU includes one or more cells (e.g., the first cell), which can be understood as the signals of the one or more cells are sent and received through the DU. That is, the DU includes one or more cells, which can be replaced by the DU corresponding to one or more cells, the one or more cells are generated by the DU, the DU generates the one or more cells, etc.

[0012] It should be understood that the CU to which the MT in the mAB node is connected is the first CU, and the connection between the MT and the first CU may be a radio resource control (RRC) connection; the CU to which the DU in the mAB node is connected may be the second CU, and the connection between the DU and the second CU may be an F1 connection. Accordingly, for the mAB node, the F1 connection terminates at the second CU, that is, the second CU may be referred to as the F1-terminating centralized unit (F1-terminating CU) of the mAB node, the first CU may be referred to as the non-F1-terminating centralized unit (non-F1-terminating CU) of the mAB node, or the first CU may be referred to as the radio resource control terminating centralized unit (RRC terminating CU) of the mAB node.

[0013] It should be understood that there may be N (N is a natural number) hop intermediate nodes (i.e., N-hop IAB intermediate nodes) between the mAB node and the IAB host node. Wherein, when N is 0, the DU that sends the first information is the IAB donor DU in the IAB host node; when N is 1, the DU that sends the first information is the DU of the intermediate node between the IAB host node and the mAB node; when N is greater than 1, the DU that sends the first information is the DU in the intermediate node connected to the mAB node among the N intermediate nodes between the IAB host node and the mAB node, i.e., there may be N-1 hop intermediate nodes between the DU in the intermediate node connected to the mAB node and the IAB host node.

[0014] It should be noted that the identifier of the first CU is used to establish data transmission in the topology of the first CU for the mAB node accessing the first cell. It can be understood that the data transmission between the DU in the mAB node and the second CU passes through the topology of the first CU. The mAB node can send the identifier of the first CU to the second CU, so that the second CU can interact with the first CU based on the identifier of the first CU (for example, the interaction of the mobile access backhaul integrated transmission migration management (IAB TRANSPORTMIGRATION MANAGEMENT) process). Through this interaction process, resources for transmitting traffic between the DU of the mAB and the second CU can be established in the topology of the first CU.

[0015] For example, taking the DU connected to the mAB node (i.e., the DU sending the first information) as the IAB host DU as an example, the data transmission path between the DU in the mAB node and the second CU may include: DU in the mAB node→MT in the mAB node→IAB host DU connected to the mAB node→second CU.

[0016] For another example, taking the DU connected to the mAB node (i.e., the DU sending the first information) as an example that is not the IAB host DU, the data transmission path between the DU in the mAB node and the second CU may include: DU in the mAB node→MT in the mAB node→DU connected to the mAB node→N (N is a natural number) hop intermediate nodes→IAB host DU→second CU.

[0017] In the above example, the IAB host DU and the first CU are located in the IAB host node connected to the MT, and in the data transmission path between the DU in the above mIAB node and the second CU, the path involving the IAB host DU can be negotiated and determined through the process interaction between the first CU and the second CU (for example, the process can be the mobile access backhaul integrated transport migration management (IABTRANSPORTMIGRATIONMANAGEMENT) process). To this end, the way in which the DU connected to the mIAB node sends the first information enables the mIAB node to determine the identifier of the first CU based on the first information, and based on the identifier of the first CU, enables the first CU and the second CU to implement the above process interaction, and then realizes the data transmission of the mIAB node through the data transmission path.

[0018] Optionally, the path between the IAB host DU and the second CU may transmit data via an Internet protocol (IP) network.

[0019] Optionally, the DU sending the first information includes: the DU sends the first information under the condition that the DU determines that the first cell is a cell that supports access of the mAB node (or, under the condition that the broadcast message sent by the DU indicates that the first cell is a node that supports the mAB node). In other words, under the condition that the first cell in the DU supports access of the mAB node, the DU can send an identifier for determining the first CU, so that after the mAB node accesses the cell that supports access of the mAB node, it can determine the identifier of the first CU through the first information, thereby realizing data transmission of the mAB node in the topology of the first CU.

[0020] Further optionally, the cells included in the DU may include a second cell in addition to the first cell. Under the condition that the DU determines that the second cell does not support access to the mIAB node, the DU may not send the first information corresponding to the second cell, that is, the second cell does not support access to the mIAB node, so that the DU does not need to send information for determining the identifier of the CU connected to the MT in the mIAB node accessed by the second cell.

[0021] In a possible implementation manner of the first aspect, the first information is carried in a system broadcast message of the first cell.

[0022] Optionally, the system broadcast information may be a system information block (SIB), such as SIB1.

[0023] Based on the above technical solution, the first information sent by the DU can be carried in the system broadcast message of the first cell, and the first information is transmitted by broadcasting, so that multiple mAB nodes can receive the first information sent by broadcasting to save overhead.

[0024] In a possible implementation of the first aspect, before sending the first information, the method also includes: the DU receives a first message, the first message is used to indicate that the radio resource control (RRC) connection establishment of the first IAB node is completed; wherein the first message includes indication information used to indicate that the first IAB node is an mIAB node; the DU determines to send the first information based on the first message.

[0025] It should be understood that after receiving the first message, the DU may also read the mIAB indication information in the first message because the DU may have certain RRC capabilities. Alternatively, the subsequent DU may forward the first message to the first CU, so that the first CU determines that the RRC connection establishment of the first IAB node is completed through the first message.

[0026] Optionally, the first message may be referred to as message 5 (message 5, MSG5), or an RRC Setup Complete (RRCSetupComplete) message.

[0027] Based on the above technical solution, after the first IAB node accesses the DU, the DU may receive a message indicating that the RRC connection establishment of the first IAB node is completed. In addition, the first message includes indication information indicating that the first IAB node is an mIAB node, so that the DU determines that an mIAB node has accessed the first CU through the DU. To this end, the DU may determine to send the first information based on the first message, so that the mIAB node can realize the data transmission of the mIAB node in the topology of the first CU through the first information.

[0028] Optionally, the first cell is any cell in the DU that supports access of the mIAB node; or, the first cell is a cell accessed by the mIAB node in the DU.

[0029] In a possible implementation manner of the first aspect, before the DU sends the first information, the method further includes: the DU receives second information, where the second information comes from the first CU; wherein the second information satisfies at least one of the following:

[0030] The second information is used to indicate that the mIAB node is allowed to access the first cell;

[0031] The second information is used to indicate that the mIAB node is not prohibited from accessing the first cell;

[0032] The second information is used to instruct to send the first information;

[0033] The DU determines to send the first information based on the second information.

[0034] Based on the above technical solution, the DU can receive the second information satisfying at least one of the above items from the first CU, so that the DU determines to send the first information based on the indication of the first CU.

[0035] In a possible implementation of the first aspect, the second information is carried in a gNB-CU configuration update message GNB-CU CONFIGURATION UPDATE. For example, by carrying a value of the mobile IAB barred information element as notbarred, it is indicated that the mIAB node access is allowed or not prohibited.

[0036] In a possible implementation of the first aspect, before the DU determines the first information, the method also includes: receiving indication information configured by the network management for indicating the identifier of the first CU or the identifier length of the identifier of the first CU; and / or, receiving indication information from the first CU for indicating the identifier of the first CU or the identifier length of the identifier of the first CU.

[0037] Based on the above technical solution, the DU can obtain the identifier of the first CU or the identifier length of the first CU through network management configuration or by receiving the configuration from the first CU, so that the DU can send the first information based on the identifier of the first CU or the identifier length of the first CU.

[0038] In a possible implementation manner of the first aspect, the DU determines the first information including: receiving the first information, wherein the first information is carried in an RRC message.

[0039] Optionally, the first information is carried in an RRC message, which may be replaced by the first information being carried in a unicast message.

[0040] It should be understood that since the communication protocol stack supported by DU includes PHY layer, MAC layer, RLC layer, etc., but does not include RRC layer; for this reason, the first information received by DU and the first information sent by DU can be messages encapsulated by PHY layer / MAC layer / RLC layer.

[0041] Based on the above technical solution, the DU can receive the first information from the first CU, and the first information is carried in the RRC message, so that the DU can forward the first information, so that the mAB node accessing the DU obtains the first information.

[0042] In a possible implementation of the first aspect, before the DU receives the first information, the method also includes: the DU sends first indication information, and the first indication information is used to indicate that the system information of the first cell does not include the first information; and / or the DU broadcasts the system information of the first cell, and the system information of the first cell does not include the first information.

[0043] Based on the above technical solution, before the DU receives the first information, the DU may send the first indication information and / or the system information of the first cell, so that the first CU can determine that the system information of the first cell does not include the first information based on the first indication information and / or the system information of the first cell. Thereafter, after the first CU determines that the system information of the first cell does not include the first information, the first CU may send the second information to the DU (or the first CU sends the first information carried in the RRC message) so that the mAB node accessing the DU can obtain the first information, and realize the data transmission of the mAB node in the topology of the first CU through the first information.

[0044] In a possible implementation manner of the first aspect, the first information includes at least one of the following:

[0045] an identifier of the first CU;

[0046] The length of the identifier of the first CU, wherein the length of the identifier of the first CU is used to determine the identifier of the first CU according to the second identifier, and the second identifier is composed of the identifier of the first CU and the identifier of the first cell;

[0047] The length of the identifier of the first cell, wherein the length of the identifier of the first cell is used to determine the identifier of the first CU according to the second identifier.

[0048] Optionally, in a new radio (NR) system, the second identifier may be a new radio cell global identifier (NCGI).

[0049] Based on the above technical solution, the first information can be implemented through at least one of the above items to enhance the flexibility of the solution implementation.

[0050] Optionally, when the first information is the length of the identifier of the first CU (for example, the first information is carried in the gNB-ID-Length information element in SIB1), compared with the implementation method in which the first information includes the identifier of the first CU, the number of bits occupied by the first information can be reduced, thereby reducing overhead.

[0051] The second aspect of the present application provides a communication method, which is executed by a first CU, or the method is executed by some components (such as a processor, a chip or a chip system, etc.) in the first CU, or the method can also be implemented by a logic module or software that can implement all or part of the functions of the first CU. In the second aspect and its possible implementation, the communication method is described as being executed by the first CU.

[0052] In the method, the first CU determines second information, where the second information satisfies at least one of the following:

[0053] The second information is used to indicate that the mIAB node is allowed to access the serving cell;

[0054] The second information is used to indicate that the mIAB node is not prohibited from accessing the serving cell;

[0055] The second information is used to instruct sending the first information;

[0056] The second information is sent, wherein the second information is used to determine the sending of the first information, the first information is carried in the system broadcast message of the service cell, the first information is used to determine the identifier of the first CU, and the DU connected to the first CU includes the service cell.

[0057] Based on the above technical solution, the second information sent by the first CU is used to determine the sending of the first information, that is, after the DU receives the second information, it can send the first information based on the indication of the second information. Among them, the first information is used to determine the identifier of the first CU connected to the DU, and the identifier of the first CU is used to establish data transmission in the topology of the first CU for the mAB node accessing the first cell. In other words, after the DU sends the first information, the MT in the mAB node accessing the DU can determine the identifier of the first CU based on the first information, and the DU in the subsequent mAB node can establish data transmission in the topology of the first CU based on the identifier of the first CU. Thus, in the case where the CU connected to the DU in the mAB node and the CU connected to the MT in the mAB node are not the same CU, the mAB node can determine the identifier of the first CU connected to the MT in the mAB node based on the information sent by the DU connected to the mAB node, and implement data transmission of the mAB node in the topology of the first CU based on the identifier of the first CU.

[0058] In a possible implementation manner of the second aspect, the method further includes: the first CU sending indication information used to indicate an identifier of the first CU or an identifier length of the identifier of the first CU.

[0059] Based on the above technical solution, the first CU can also send indication information to the DU to indicate the identifier of the first CU or the identifier length of the identifier of the first CU, so that the DU can determine the identifier of the first CU or the identifier length of the identifier of the first CU based on the indication information, and then enable the DU to send the first information based on the identifier of the first CU or the identifier length of the identifier of the first CU.

[0060] In a possible implementation manner of the second aspect, the first information includes at least one of the following:

[0061] an identifier of the first CU;

[0062] The length of the identifier of the first CU, wherein the length of the identifier of the first CU is used to determine the identifier of the first CU according to the second identifier, and the second identifier is composed of the identifier of the first CU and the identifier of the serving cell;

[0063] The length of the identifier of the serving cell, wherein the length of the identifier of the serving cell is used to determine the identifier of the first CU according to the second identifier.

[0064] Optionally, in the NR system, the second identifier may be NCGI.

[0065] Based on the above technical solution, the first information can be implemented through at least one of the above items to enhance the flexibility of the solution implementation.

[0066] Optionally, when the first information is the length of the identifier of the first CU (for example, the first information is carried in the gNB-ID-Length information element in SIB1), compared with the implementation method in which the first information includes the identifier of the first CU, the number of bits occupied by the first information can be reduced, thereby reducing overhead.

[0067] In a possible implementation manner of the second aspect, the first CU determining the second information includes: determining, by the first CU, the second information based on at least one of the following:

[0068] The first CU receives first indication information from the DU, where the first indication information is used to indicate that the system information of the serving cell does not include the first information;

[0069] The first CU receives second indication information from a core network element, where the second indication information is used to indicate that the authorization of the mAB node is passed;

[0070] The first CU receives the second indication information and / or the third indication information from the source CU of the MT in the first IAB node, where the third indication information is used to indicate that the first IAB node is an mIAB node and the first CU is a target CU of the MT in the first IAB node;

[0071] The first CU determines that the first CU is not an F1-terminating centralized unit (F1-terminating CU) of the first IAB node;

[0072] The first CU receives fourth indication information from the third CU, where the fourth indication information is used to indicate that the third CU is an F1-terminating CU of the first IAB node;

[0073] The first CU receives fifth indication information from the MT in the first IAB node, where the fifth indication information is used to indicate that the first CU is not the F1-terminating CU of the first IAB node;

[0074] The first CU determines that the DU in the first IAB node is to perform DU migration;

[0075] The first CU receives sixth indication information from the MT in the first IAB node or the F1-terminating CU of the first IAB node, where the sixth indication information is used to indicate a request for the first information.

[0076] Based on the above technical solution, when at least one of the above items is met, the first CU can determine that the DU connected to the first CU may be accessed by the mAB node. To this end, the first CU can send the second information, so that after receiving the second information, it can send the first information based on the indication of the second information, so that after the mAB node accesses the DU, it can determine the identifier of the first CU connected to the MT in the mAB node based on the first information, and realize the data transmission of the mAB node in the topology of the first CU based on the identifier of the first CU.

[0077] In a third aspect of the present application, there is provided a communication method, which is executed by a first CU, or the method is executed by some components in the first CU (such as a processor, a chip or a chip system, etc.), or the method can also be implemented by a logic module or software that can implement all or part of the functions of the first CU. In the third aspect and its possible implementation, the communication method is described as being executed by the first CU. In the method, the first CU determines first information based on at least one of the following, and the first information is used to determine the identifier of the first CU. The DU connected to the first CU includes a service cell of a first access backhaul integrated IAB node, and the first IAB node is an mIAB node:

[0078] The first CU receives first indication information from the DU, where the first indication information is used to indicate that the system information of the serving cell does not include the first information;

[0079] The first CU receives second indication information from a core network element, where the second indication information is used to indicate that the authorization of the mAB node is passed;

[0080] The first CU receives the second indication information and / or the third indication information from the source CU of the MT in the first IAB node, where the third indication information is used to indicate that the first IAB node is an mIAB node and the first CU is a target CU of the MT in the first IAB node;

[0081] The first CU determines that the first CU is not an F1-terminating centralized unit (F1-terminating CU) of the first IAB node;

[0082] The first CU receives fourth indication information from the third CU, where the fourth indication information is used to indicate that the third CU is an F1-terminating CU of the first IAB node;

[0083] The first CU receives fifth indication information from the MT in the first IAB node, where the fifth indication information is used to indicate that the first CU is not the F1-terminating CU of the first IAB node;

[0084] The first CU determines that the DU in the first IAB node is to perform DU migration;

[0085] The first CU receives sixth indication information from the MT in the first IAB node or the F1-terminating CU of the first IAB node, where the sixth indication information is used to indicate a request for the first information;

[0086] The first CU sends the first information, where the first information is carried in an RRC message.

[0087] Based on the above technical solution, when at least one of the above items is met, the first CU can determine that the DU connected to the first CU may be accessed by the mAB node. To this end, the first CU can send the first information for determining the identity of the first CU to the first IAB node through the DU, and the first information is carried in the RRC message, and the first IAB node is the mAB node. Among them, the identity of the first CU is used to establish data transmission in the topology of the first CU for the mAB node accessing the first cell. In other words, after the first CU sends the first information to the first IAB node through the DU, the MT in the first IAB node accessing the DU can determine the identity of the first CU based on the first information, and the subsequent DU in the first IAB node can establish data transmission in the topology of the first CU based on the identity of the first CU. Thus, in the case where the CU connected to the DU in the mAB node and the CU connected to the MT in the mAB node are not the same CU, the mAB node can determine the identity of the first CU connected to the MT in the mAB node based on the information sent by the DU connected to the mAB node, and implement the data transmission of the mAB node in the topology of the first CU based on the identity of the first CU.

[0088] Optionally, the second indication information from the core network element is carried in any one of the following items: an initial context establishment request (INITIAL CONTEXT SETUP REQUEST) message, a path switch request response (PATH SWITCH REQUESTACK) message, and a user equipment context modification request (UE CONTEXT MODIFICATION REQUEST) message.

[0089] Further optionally, the core network element may include an access and mobility management function (AMF) network element.

[0090] In a possible implementation manner of the third aspect, the first information includes at least one of the following:

[0091] an identifier of the first CU;

[0092] The length of the identifier of the first CU, wherein the length of the identifier of the first CU is used to determine the identifier of the first CU according to the second identifier, and the second identifier is composed of the identifier of the first CU and the identifier of the serving cell;

[0093] The length of the identifier of the serving cell, wherein the length of the identifier of the serving cell is used to determine the identifier of the first CU according to the second identifier.

[0094] Optionally, in the NR system, the second identifier may be NCGI.

[0095] Based on the above technical solution, the first information can be implemented through at least one of the above items to enhance the flexibility of the solution implementation.

[0096] Optionally, when the first information is the length of the identifier of the first CU, compared with the implementation method in which the first information includes the identifier of the first CU, the number of bits occupied by the first information can be reduced, thereby reducing overhead.

[0097] In the fourth aspect of the present application, there is provided a communication method, which is executed by a first IAB node, or the method is executed by some components (such as a processor, a chip or a chip system, etc.) in the first IAB node, or the method can also be implemented by a logic module or software that can realize all or part of the functions of the first IAB node. In the fourth aspect and its possible implementation, the communication method is described as being executed by the first IAB node. In the method, the first IAB node receives first information, the first information comes from a service cell, the first information is used to determine the identifier of the first CU, the DU connected to the first CU includes the service cell, and the service cell supports the access of the integrated mobile access backhaul mIAB node; the first IAB node sends third information to the second CU connected to the DU in the first IAB node, and the third information includes the identifier of the first CU, wherein the identifier of the first CU is used to establish data transmission for the first IAB node in the topology of the first CU, and the first IAB node is an mIAB node.

[0098] Based on the above technical solution, the first information received by the first IAB node is used to determine the identifier of the first CU connected to the DU, and the identifier of the first CU is used to establish data transmission in the topology of the first CU for the mAB node accessing the first cell. In other words, the first IAB node acts as an mAB node, and the MT in the first IAB node can determine the identifier of the first CU based on the first information, and the DU in the subsequent first IAB node can establish data transmission in the topology of the first CU based on the identifier of the first CU. Thus, in the case where the CU connected to the DU in the first IAB node and the CU connected to the MT in the first IAB node are not the same CU, the first IAB node can determine the identifier of the first CU connected to the MT in the first IAB node based on the information sent by the DU connected to the first IAB node, and implement data transmission of the first IAB node in the topology of the first CU based on the identifier of the first CU.

[0099] In a possible implementation manner of the fourth aspect, the first information is carried in a system information broadcast of the serving cell.

[0100] Optionally, the system broadcast information may be a system information block (SIB), such as SIB1.

[0101] Based on the above technical solution, the first information received by the first IAB node can be carried in the system broadcast message of the first cell, and the first information is transmitted by broadcasting, so that multiple mAB nodes can receive the first information sent by broadcasting to save overhead.

[0102] In a possible implementation manner of the fourth aspect, before the first IAB node receives the first information, the method also includes: the first IAB node sends a first message, the first message is used to indicate that the radio resource control RRC connection establishment of the first IAB node is completed; wherein the first message includes indication information for indicating that the first IAB node is a mobile IAB node.

[0103] Optionally, the first message may be referred to as message 5 (MSG5).

[0104] Based on the above technical solution, after the first IAB node accesses the DU, the first IAB node may send a message indicating that the RRC connection establishment of the first IAB node is completed. In addition, the first message includes indication information indicating that the first IAB node is an mIAB node, so that the DU determines that an mIAB node has accessed the first CU through the DU. To this end, the DU may determine to send the first information based on the first message, so that the mIAB node can realize the data transmission of the mIAB node in the topology of the first CU through the first information.

[0105] In a possible implementation manner of the fourth aspect, the first information is carried in an RRC message.

[0106] Based on the above technical solution, the first information received by the first IAB node is carried in an RRC message, so that the DU can forward the first information, so that the first IAB node accessing the DU obtains the first information.

[0107] Optionally, before the first IAB node sends the first message, the method further includes: the first IAB node receives a system information broadcast of the serving cell, wherein the system information broadcast of the serving cell does not include the first information.

[0108] In a possible implementation manner of the fourth aspect, the first information includes at least one of the following:

[0109] an identifier of the first CU;

[0110] The length of the identifier of the first CU, wherein the length of the identifier of the first CU is used to determine the identifier of the first CU according to the second identifier, and the second identifier is composed of the identifier of the first CU and the identifier of the serving cell;

[0111] The length of the identifier of the serving cell, wherein the length of the identifier of the serving cell is used to determine the identifier of the first CU according to the second identifier.

[0112] Optionally, in the NR system, the second identifier may be NCGI.

[0113] Based on the above technical solution, the first information can be implemented through at least one of the above items to enhance the flexibility of the solution implementation.

[0114] Optionally, when the first information is the length of the identifier of the first CU (for example, the first information is carried in the gNB-ID-Length information element in SIB1), compared with the implementation method in which the first information includes the identifier of the first CU, the number of bits occupied by the first information can be reduced, thereby reducing overhead.

[0115] In a fifth aspect, the present application provides a communication device, which is a terminal device, or a partial component in a DU (such as a processor, a chip, or a chip system, etc.), or a logic module or software capable of implementing all or part of the DU functions. In the fifth aspect and its possible implementation, the communication device is described as an example of a DU.

[0116] The device includes a transceiver unit and a processing unit; the processing unit is used to determine the first information, the first information is used to determine the identifier of the first centralized unit CU, the distributed unit DU connected to the first CU includes a first cell, and the first cell is a cell that supports the access of the mobile access backhaul integrated mAB node; wherein the identifier of the first CU is used to establish data transmission in the topology of the first CU for the mAB node accessing the first cell; the transceiver unit is used to send the first information.

[0117] In a possible implementation manner of the fifth aspect, the first information is carried in a system broadcast message of the first cell.

[0118] In a possible implementation of the fifth aspect, the transceiver unit is also used to receive a first message, which is used to indicate that the radio resource control RRC connection establishment of the first IAB node is completed; wherein the first message includes indication information used to indicate that the first IAB node is an mIAB node; and the processing unit is specifically used to determine to send the first information based on the first message.

[0119] In a possible implementation manner of the fifth aspect, the transceiver unit is further configured to receive second information, where the second information comes from the first CU; wherein the second information satisfies at least one of the following:

[0120] The second information is used to indicate that the mIAB node is allowed to access the first cell;

[0121] The second information is used to indicate that the mIAB node is not prohibited from accessing the first cell;

[0122] The second information is used to instruct to send the first information;

[0123] The first information is sent based on the second information.

[0124] In a possible implementation manner of the fifth aspect, the first cell is any cell in the DU that supports access of the mIAB node; or, the first cell is a cell accessed by the mIAB node in the DU.

[0125] In a possible implementation of the fifth aspect, the transceiver unit is also used to receive indication information configured by the network management for indicating the identifier of the first CU or the identifier length of the identifier of the first CU; and / or, the transceiver unit is also used to receive indication information from the first CU for indicating the identifier of the first CU or the identifier length of the identifier of the first CU.

[0126] In a possible implementation manner of the fifth aspect, the processing unit is used to determine the first information, including: the processing unit is specifically used to receive the first information through the transceiver unit, wherein the first information is carried in an RRC message.

[0127] In a possible implementation of the fifth aspect, the transceiver unit is also used to send first indication information, where the first indication information is used to indicate that the system information of the first cell does not include the first information; and / or, the transceiver unit is also used to broadcast the system information of the first cell, where the system information of the first cell does not include the first information.

[0128] In a possible implementation manner of the fifth aspect, the first information includes at least one of the following:

[0129] an identifier of the first CU;

[0130] The length of the identifier of the first CU, wherein the length of the identifier of the first CU is used to determine the identifier of the first CU according to the second identifier, and the second identifier is composed of the identifier of the first CU and the identifier of the first cell;

[0131] The length of the identifier of the first cell, wherein the length of the identifier of the first cell is used to determine the identifier of the first CU according to the second identifier.

[0132] In the fifth aspect of the embodiment of the present application, the constituent modules of the communication device can also be used to execute the steps performed in each possible implementation method of the first aspect and achieve corresponding technical effects. For details, please refer to the first aspect and will not be repeated here.

[0133] In a sixth aspect of the present application, a communication device is provided, which is a first CU, or the device is a partial component (such as a processor, a chip or a chip system, etc.) in the first CU, or the device can also be a logic module or software that can implement all or part of the functions of the first CU. In the sixth aspect and its possible implementation, the communication device is described as an example of the first CU.

[0134] The device includes a transceiver unit and a processing unit; the processing unit is used to determine the second information, and the second information satisfies at least one of the following:

[0135] The second information is used to indicate that the mIAB node is allowed to access the serving cell;

[0136] The second information is used to indicate that the mIAB node is not prohibited from accessing the serving cell;

[0137] The second information is used to instruct sending the first information;

[0138] The transceiver unit is used to send the second information, wherein the second information is used to determine the sending of the first information, the first information is carried in the system broadcast message of the service cell, the first information is used to determine the identifier of the first CU, and the DU connected to the first CU includes the service cell.

[0139] In a possible implementation manner of the sixth aspect, the transceiver unit is further used to send indication information used to indicate the identifier of the first CU or the identifier length of the identifier of the first CU.

[0140] In a possible implementation manner of the sixth aspect, the first information includes at least one of the following:

[0141] an identifier of the first CU;

[0142] The length of the identifier of the first CU, wherein the length of the identifier of the first CU is used to determine the identifier of the first CU according to the second identifier, and the second identifier is composed of the identifier of the first CU and the identifier of the serving cell;

[0143] The length of the identifier of the serving cell, wherein the length of the identifier of the serving cell is used to determine the identifier of the first CU according to the second identifier.

[0144] In a possible implementation manner of the sixth aspect, the processing unit determining the second information includes: determining, by the processing unit, the second information based on at least one of the following:

[0145] The transceiver unit receives first indication information from the DU, where the first indication information is used to indicate that the system information of the serving cell does not include the first information;

[0146] The transceiver unit receives second indication information from a core network element, where the second indication information is used to indicate that the authorization of the mAB node is passed;

[0147] The transceiver unit receives the second indication information and / or the third indication information from the source CU of the MT in the first IAB node, where the third indication information is used to indicate that the first IAB node is an mIAB node and the first CU is a target CU of the MT in the first IAB node;

[0148] The processing unit determines that the first CU is not an F1-terminating centralized unit F1-terminating CU of the first IAB node;

[0149] The transceiver unit receives fourth indication information from the third CU, where the fourth indication information is used to indicate that the third CU is the F1-terminating CU of the first IAB node;

[0150] The transceiver unit receives fifth indication information from the MT in the first IAB node, where the fifth indication information is used to indicate that the first CU is not the F1-terminating CU of the first IAB node;

[0151] The processing unit determines that a DU in the first IAB node is to perform DU migration;

[0152] The transceiver unit receives sixth indication information from the MT in the first IAB node or the F1-terminating CU of the first IAB node, where the sixth indication information is used to indicate a request for the first information.

[0153] In the sixth aspect of the embodiments of the present application, the constituent modules of the communication device can also be used to execute the steps performed in each possible implementation method of the second aspect and achieve corresponding technical effects. For details, please refer to the second aspect and will not be repeated here.

[0154] In a seventh aspect of the present application, a communication device is provided, which is a first CU, or the device is a partial component (such as a processor, a chip or a chip system, etc.) in the first CU, or the device can also be a logic module or software that can implement all or part of the functions of the first CU. In the seventh aspect and its possible implementation, the communication device is described as an example of the first CU.

[0155] The device includes a transceiver unit and a processing unit; the processing unit is used to determine the first information based on at least one of the following, the first information is used to determine the identifier of the first CU, the DU connected to the first CU includes a service cell of a first access backhaul integrated IAB node, and the first IAB node is an mIAB node:

[0156] The transceiver unit receives first indication information from the DU, where the first indication information is used to indicate that the system information of the serving cell does not include the first information;

[0157] The transceiver unit receives second indication information from a core network element, where the second indication information is used to indicate that the authorization of the mAB node is passed;

[0158] The transceiver unit receives the second indication information and / or the third indication information from the source CU of the MT in the first IAB node, where the third indication information is used to indicate that the first IAB node is an mIAB node and the first CU is a target CU of the MT in the first IAB node;

[0159] The processing unit determines that the first CU is not an F1-terminating centralized unit F1-terminating CU of the first IAB node;

[0160] The transceiver unit receives fourth indication information from the third CU, where the fourth indication information is used to indicate that the third CU is the F1-terminating CU of the first IAB node;

[0161] The transceiver unit receives fifth indication information from the MT in the first IAB node, where the fifth indication information is used to indicate that the first CU is not the F1-terminating CU of the first IAB node;

[0162] The processing unit determines that a DU in the first IAB node is to perform DU migration;

[0163] The transceiver unit receives sixth indication information from the MT in the first IAB node or the F1-terminating CU of the first IAB node, where the sixth indication information is used to indicate a request for the first information;

[0164] The transceiver unit is used to send the first information, where the first information is carried in a radio resource control RRC message.

[0165] In a possible implementation of the seventh aspect, the second indication information from the core network network element is carried by any one of the following items: an initial context establishment request INITIAL CONTEXT SETUP REQUEST message, a path switch request response PATH SWITCH REQUEST ACK message, and a user equipment context modification request UE CONTEXT MODIFICATION REQUEST message.

[0166] In a possible implementation manner of the seventh aspect, the first information includes at least one of the following:

[0167] an identifier of the first CU;

[0168] The length of the identifier of the first CU, wherein the length of the identifier of the first CU is used to determine the identifier of the first CU according to the second identifier, and the second identifier is composed of the identifier of the first CU and the identifier of the serving cell;

[0169] The length of the identifier of the serving cell, wherein the length of the identifier of the serving cell is used to determine the identifier of the first CU according to the second identifier.

[0170] In the seventh aspect of the embodiment of the present application, the constituent modules of the communication device can also be used to execute the steps performed in each possible implementation method of the third aspect and achieve corresponding technical effects. For details, please refer to the third aspect and will not be repeated here.

[0171] In an eighth aspect of the present application, a communication device is provided, which is a first IAB node, or the device is a partial component (such as a processor, a chip or a chip system, etc.) in the first IAB node, or the device can also be a logic module or software that can implement all or part of the functions of the first IAB node. In the eighth aspect and its possible implementation, the communication device is described as an example of being executed by the first IAB node.

[0172] The device includes a transceiver unit and a processing unit; the transceiver unit is used to receive first information, the first information comes from a service cell, the first information is used to determine the identifier of a first CU, the DU connected to the first CU includes the service cell, and the service cell supports access to an integrated mobile access and backhaul mIAB node; the processing unit is used to determine the identifier of the first CU based on the first information; the transceiver unit is also used to send third information to a second CU connected to the DU in the first IAB node, the third information includes the identifier of the first CU, wherein the identifier of the first CU is used to establish data transmission for the first IAB node in the topology of the first CU, and the first IAB node is an mIAB node.

[0173] In a possible implementation manner of the eighth aspect, the first information is carried in the system information broadcast of the serving cell.

[0174] In a possible implementation manner of the eighth aspect, the transceiver unit is further used to send a first message, where the first message is used to indicate that the radio resource control RRC connection establishment of the first IAB node is completed; wherein the first message includes indication information for indicating that the first IAB node is a mobile IAB node.

[0175] In a possible implementation manner of the eighth aspect, the first information is carried in an RRC message.

[0176] In a possible implementation manner of the eighth aspect, the transceiver unit is further used to receive a system information broadcast of the serving cell, and the system information broadcast of the serving cell does not include the first information.

[0177] In a possible implementation manner of the eighth aspect, the first information includes at least one of the following:

[0178] an identifier of the first CU;

[0179] The length of the identifier of the first CU, wherein the length of the identifier of the first CU is used to determine the identifier of the first CU according to the second identifier, and the second identifier is composed of the identifier of the first CU and the identifier of the serving cell;

[0180] The length of the identifier of the serving cell, wherein the length of the identifier of the serving cell is used to determine the identifier of the first CU according to the second identifier.

[0181] In the eighth aspect of the embodiments of the present application, the constituent modules of the communication device can also be used to execute the steps performed in each possible implementation method of the fourth aspect and achieve corresponding technical effects. For details, please refer to the fourth aspect and will not be repeated here.

[0182] A ninth aspect of an embodiment of the present application provides a communication device, comprising at least one processor, wherein the at least one processor is used to execute programs or instructions in a memory so that the device implements the method executed in each possible implementation manner of any one of the first to fourth aspects mentioned above.

[0183] The tenth aspect of an embodiment of the present application provides a communication device, comprising at least one logic circuit and an input / output interface; the logic circuit is used to execute the method executed in any possible implementation of any one of the first to fourth aspects mentioned above.

[0184] In an eleventh aspect of an embodiment of the present application, a computer-readable storage medium is provided, which is used to store one or more computer-executable instructions. When the computer-executable instructions are executed by a processor, the processor executes a method as performed in any possible implementation of any one of the first to fourth aspects above.

[0185] A twelfth aspect of an embodiment of the present application provides a computer program product. When a computer program in the computer program product is executed by a processor, the processor executes the method executed in each possible implementation manner of any one of the first to fourth aspects above.

[0186] A thirteenth aspect of an embodiment of the present application provides a chip system, which includes at least one processor for supporting a communication device to implement a method executed in any possible implementation manner of any one of the first to fourth aspects above.

[0187] In a possible design, the chip system may also include a memory for storing program instructions and data necessary for the first communication device. The chip system may be composed of a chip, or may include a chip and other discrete devices. Optionally, the chip system also includes an interface circuit, which provides program instructions and / or data for the at least one processor.

[0188] A fourteenth aspect of an embodiment of the present application provides a communication system, which includes the DU and the first IAB node in any of the above aspects and any of its implementation methods.

[0189] Optionally, the communication system also includes the first CU in any of the above aspects and any of its implementations.

[0190] It should be understood that the technical effects brought about by any design method in the fifth to fourteenth aspects can refer to the technical effects brought about by the different design methods in the first to fourth aspects mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0191] Figure 1 A schematic diagram of a communication system provided for this application;

[0192] Figure 2a A schematic diagram of the IAB communication scenario provided for this application;

[0193] Figure 2b Another schematic diagram of the IAB communication scenario provided for this application;

[0194] Figure 2c A schematic diagram of the IAB communication protocol stack provided for this application;

[0195] Figure 2d Another schematic diagram of the IAB communication protocol stack provided for this application;

[0196] Figure 2e A schematic diagram of the IAB access process provided for this application;

[0197] Figure 2f A schematic diagram of IAB node migration;

[0198] Figure 2g Another diagram for IAB node migration;

[0199] Figure 2h Another diagram for IAB node migration;

[0200] Figure 3 A schematic diagram of the communication method provided by the present application;

[0201] Figure 4 Another schematic diagram of the communication method provided by the present application;

[0202] Figure 5a Another schematic diagram of the communication method provided by the present application;

[0203] Figure 5b Another schematic diagram of the communication method provided by the present application;

[0204] Figure 5c Another schematic diagram of the communication method provided by the present application;

[0205] Figure 6 Another schematic diagram of the communication method provided by the present application;

[0206] Figure 7A schematic diagram of a communication device provided for this application;

[0207] Figure 8 Another schematic diagram of a communication device provided by the present application;

[0208] Fig. 9 Another schematic diagram of a communication device provided by the present application. DETAILED DESCRIPTION

[0209] First, some terms that may be involved in the embodiments of the present application are explained.

[0210] (1) Configuration and pre-configuration: In this application, configuration and pre-configuration will be used at the same time. Configuration refers to the base station or server and other network devices sending some parameter configuration information or parameter values ​​to the terminal through messages or signaling, so that the terminal can determine the communication parameters or resources during transmission based on these values ​​or information. Pre-configuration is similar to configuration. It can be a method in which a base station or server and other network devices send parameter information or values ​​to the terminal through a communication link or carrier; it can also be a definition of corresponding parameters or parameter values ​​given in the standard, or by setting the relevant parameters or values ​​in the terminal device in advance. This application does not limit this. Furthermore, these values ​​and parameters can be changed or updated.

[0211] (2) In this application, "used for indication" may include being used for direct indication and being used for indirect indication. When describing that a certain indication information is used for indicating A, it can be understood that the indication information carries A, directly indicates A, or indirectly indicates A.

[0212] In this application, the information indicated by the indication information is referred to as the information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated. For example, it can be implemented by direct indication, such as by indicating the information to be indicated itself or the index of the information to be indicated. It can also be implemented by indirectly indicating other information, wherein there is an association between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can also be achieved with the help of the arrangement order of each information agreed in advance (for example, specified by the protocol), thereby reducing the indication overhead to a certain extent.

[0213] The information to be indicated can be sent as a whole, or divided into multiple sub-information and sent separately, and the sending period and / or sending time of these sub-information can be the same or different. The specific sending method is not limited in this application. Among them, the sending period and / or sending time of these sub-information can be pre-defined, for example, pre-defined according to the protocol, or can be configured by the transmitting device by sending configuration information to the receiving device. Among them, the configuration information can include, for example but not limited to, one or a combination of at least two of RRC signaling, medium access control (MAC) layer signaling and physical layer signaling. Among them, MAC layer signaling, for example, includes medium access control control element (MAC CE); physical layer signaling, for example, includes downlink control information (DCI).

[0214] (3) The terms "system" and "network" in the embodiments of the present application can be used interchangeably. "At least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated with each other are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, "at least one of A, B and C" includes A, B, C, AB, AC, BC or ABC. And, unless otherwise specified, the ordinal numbers such as "first" and "second" mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the order, timing, priority or importance of multiple objects.

[0215] In addition, in this application, unless otherwise specified, the same or similar parts between the various embodiments can refer to each other. In the various embodiments in this application, and the various methods / designs / implementations in each embodiment, if there is no special description and logical conflict, the terms and / or descriptions between different embodiments and the various methods / designs / implementations in each embodiment are consistent and can be referenced to each other, and the technical features in different embodiments and the various methods / designs / implementations in each embodiment can be combined to form new embodiments, methods, or implementations according to their inherent logical relationships. The implementation methods of this application described below do not constitute a limitation on the scope of protection of this application.

[0216] (4) "Send" and "receive" in the embodiments of the present application indicate the direction of signal transmission. For example, the communication process between entity A and entity B is taken as an example. In the present application, entity A sends information to entity B, which may be A directly sending to B or A indirectly sending to B through other entities. Similarly, entity B receives information from entity A, which may be entity B directly receiving the information sent by entity A or entity B indirectly receiving the information sent by entity A through other entities. Entities A and B here may be RAN nodes or terminals, or modules inside RAN nodes or terminals. The sending and receiving of information may be information interaction between a RAN node and a terminal, for example, information interaction between a base station and a terminal; the sending and receiving of information may also be information interaction between two RAN nodes, for example, information interaction between a CU and a DU; the sending and receiving of information may also be information interaction between different modules inside a device, for example, information interaction between a terminal chip and other modules of the terminal, or information interaction between a base station chip and other modules in the base station. "Send" may also be understood as "output" of a chip interface, and "receive" may also be understood as "input" of a chip interface.

[0217] In this application, unless otherwise specified, the same or similar parts between the various embodiments can refer to each other. In the various embodiments in this application, and the various methods / designs / implementations in each embodiment, if there is no special description and logical conflict, the terms and / or descriptions between different embodiments and the various methods / designs / implementations in each embodiment are consistent and can be referenced to each other. The technical features in different embodiments and the various methods / designs / implementations in each embodiment can be combined to form new embodiments, methods, or implementations according to their inherent logical relationships. The implementation methods of this application described below do not constitute a limitation on the scope of protection of this application.

[0218] See also Figure 1 , is a schematic diagram of the architecture of a communication system 1000 used in an embodiment of the present application.

[0219] like Figure 1 As shown, the communication system includes a radio access network (RAN) 100 and a core network 200. Optionally, the communication system 1000 may also include the Internet 300. The RAN 100 includes at least one RAN node (such as Figure 1 110a and 110b in the figure, collectively referred to as 110), and may also include at least one terminal (such as Figure 1 RAN 100 may also include other RAN nodes, such as wireless relay equipment and / or wireless backhaul equipment ( Figure 1(not shown in the figure). The terminal 120 is connected to the RAN node 110 by wireless means, and the RAN node 110 is connected to the core network 200 by wireless or wired means. The core network device in the core network 200 and the RAN node 110 in the RAN 100 may be independent and different physical devices, or may be the same physical device that integrates the logical functions of the core network device and the logical functions of the RAN node. Terminals and terminals and RAN nodes and RAN nodes may be connected to each other by wired or wireless means.

[0220] RAN100 may be an evolved universal terrestrial radio access (E-UTRA) system, an NR system, and a future radio access system defined in the 3rd generation partnership project (3GPP). RAN100 may also include two or more of the above-mentioned different radio access systems. RAN100 may also be an open RAN (open RAN, O-RAN).

[0221] RAN node, also known as radio access network equipment, RAN entity or access node, is used to help terminals access the communication system wirelessly. In one application scenario, the RAN node can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in the fifth generation (5G) mobile communication system, a next generation NodeB in the sixth generation (6G) mobile communication system, or a base station in a future mobile communication system. RAN nodes can be macro base stations (such as Figure 1 110a), or a micro base station or an indoor station (such as Figure 1 110b) in the figure, it can also be a relay node or a donor node.

[0222] In another application scenario, the cooperation of multiple RAN nodes can be used to help the terminal achieve wireless access, and different RAN nodes respectively implement part of the functions of the base station. For example, the RAN node can be a centralized unit (CU), a distributed unit (DU) or a radio unit (RU). The CU here completes the functions of the radio resource control protocol and the packet data convergence protocol (PDCP) of the base station, and can also complete the function of the service data adaptation protocol (SDAP); the DU completes the functions of the radio link control layer and the MAC layer of the base station, and can also complete the functions of part of the physical layer or all of the physical layer. For the specific description of the above-mentioned various protocol layers, please refer to the relevant technical specifications of 3GPP. RU can be used to implement the transceiver function of radio frequency signals. CU and DU can be two independent RAN nodes, or they can be integrated in the same RAN node, such as integrated in a baseband unit (BBU). RU can be included in a radio frequency device, such as a remote radio unit (RRU) or an active antenna unit (AAU). The CU can be further divided into two types of RAN nodes: CU-control plane and CU-user plane.

[0223] In different systems, RAN nodes may have different names. For example, in an O-RAN system, CU may be called an open CU (open CU, O-CU), DU may be called an open DU (open DU, O-DU), and RU may be called an open RU (open RU, O-RU). The RAN nodes in the embodiments of the present application may be implemented by software modules, hardware modules, or a combination of software modules and hardware modules. For example, the RAN node may be a server loaded with corresponding software modules. The embodiments of the present application do not limit the specific technology and specific device form adopted by the RAN node.

[0224] For ease of description, the following description takes a base station as an example of a RAN node. It can be understood that when the communication system includes an IAB network, the base station (ie, RAN node) can be an IAB node.

[0225] A terminal is a device with wireless transceiver function, which can send signals to a base station or receive signals from a base station. A terminal can also be called a terminal device, user equipment (UE), a mobile station, a mobile terminal, etc. The terminal can be widely used in various scenarios, for example, device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, automatic driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a wearable device, a vehicle, an airplane, a ship, a robot, a mechanical arm, a smart home device, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal.

[0226] Base stations and terminals can be fixed or movable. Base stations and terminals can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on airplanes, balloons, and artificial satellites. The embodiments of this application do not limit the application scenarios of base stations and terminals.

[0227] The roles of the base station and the terminal can be relative, for example, Figure 1 The helicopter or drone 120i in the figure can be configured as a mobile base station. For the terminal 120j that accesses the wireless access network 100 through 120i, the terminal 120i is a base station; but for the base station 110a, 120i is a terminal, that is, 110a and 120i communicate through the wireless air interface protocol. Of course, 110a and 120i can also communicate through the interface protocol between base stations. In this case, relative to 110a, 120i is also a base station. Therefore, base stations and terminals can be collectively referred to as communication devices. Figure 1 110a and 110b in the figure may be referred to as communication devices having base station functions. Figure 1 120a-120j in the figure can be called communication devices with terminal functions.

[0228] Base stations and terminals, base stations and base stations, and terminals and terminals can communicate through authorized spectrum, unauthorized spectrum, or both; they can communicate through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0229] In the embodiments of the present application, the functions of the base station may also be performed by a module (such as a chip) in the base station, or by a control subsystem including the base station function. The control subsystem including the base station function here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal may also be performed by a module (such as a chip or a modem) in the terminal, or by a device including the terminal function.

[0230] It should be understood that the present application can be applied to a long term evolution (LTE) system, a new radio (NR) system, or a communication system evolved after 5G (such as 6G, etc.). The communication system includes network equipment and terminal equipment.

[0231] exist Figure 1 In the communication system shown, the IAB technology is used in both the access link and the backhaul link to adopt wireless transmission solutions, which can reduce the deployment of optical fiber; and can meet the needs of increased network capacity, wider coverage, ultra-high reliability and ultra-low latency.

[0232] In the IAB network, the relay node, or IAB-node, can provide wireless access services for terminal devices. The service data of the terminal device is transmitted by the IAB-node to the IAB host (IAB-donor) through the wireless backhaul link. The IAB-node consists of an MT part and a DU part. When the IAB-node faces its parent node, it can act as a terminal device, that is, the role of MT; when the IAB-node faces its child node (the child node may be another IAB-node, or an ordinary terminal device), it is regarded as a network device, that is, the role of DU. The IAB-donor is an access network element with complete base station (such as gNB) functions, including CU and DU. The IAB-donor is connected to the core network that serves the terminal device (for example, connected to the 5G core network).

[0233] The following will be combined Figure 2a to Figure 2h The implementation example shown introduces the IAB network.

[0234] The following Figure 2a to Figure 2d , introduces the basic concepts of IAB network.

[0235] like Figure 2a FIG. 4 is a schematic diagram of the IAB network.

[0236] exist Figure 2a In the IAB network shown, the terminal devices include UE1 and UE2, and the IAB nodes include IAB Node 1 to IAB Node 5, as well as an IAB donor node. A transmission path between any UE and an IAB-donor may include one or more IAB-nodes. Each IAB-node needs to maintain a wireless backhaul link to the parent node and also needs to maintain a wireless link with the child node. If the child node of the IAB-node is a terminal device (such as Figure 2a If the child node of the IAB-node is another IAB-node, the link between the IAB-node and the child node (ie, the other IAB-node) is a wireless backhaul link. Figure 2a In the path "UE1→IAB-node4→IAB-node3→IAB-node1→IAB-donor", UE1 accesses IAB-node4 through a wireless access link, IAB-node4 is connected to IAB-node3 through a wireless backhaul link, IAB-node3 is connected to IAB-node1 through a wireless backhaul link, and IAB-node1 is connected to IAB-donor through a wireless backhaul link.

[0237] like Figure 2b FIG. 4 is a schematic diagram showing a wireless relay scenario implemented through standalone (SA) networking.

[0238] like Figure 2b As shown in the figure, the communication nodes include 5G core network (5G core, 5GC), 5G access network equipment (denoted as gNodeB in the figure), IAB-donor, and one or more IAB-nodes. Figure 2bIn the figure, the IAB-node DU (hereinafter simply referred to as IAB-DU) is logically connected to the IAB-donor CU (hereinafter simply referred to as CU) through the F1 interface. In fact, the connection between the IAB-DU and the CU is realized through the NR Uu interface between the IAB-node MT and the parent node DU of each hop, but because the IAB-DU can communicate with the CU in the end, it can be considered that the F1 interface exists logically.

[0239] Exemplarily, the F1 interface may be used to support a user plane protocol (F1-user plane, F1-U) and a control plane protocol (F1-control plane, F1-C).

[0240] For example, Figure 2c As shown, F1-U includes one or more of the following protocol layers: general packet radio service tunneling protocol user plane (GTP-U), user datagram protocol (UDP), internet protocol (IP) and other protocol layers. Through F1-U, user plane data transmission and downlink transmission status feedback can be performed between IAB-donor and IAB-node.

[0241] For example, Figure 2d As shown, F1-C includes one or more of the following: F1 application protocol (F1AP), stream control transport protocol (SCTP), IP and other protocol layers. Through F1-C, the IAB-donor and IAB-node can perform interface management, manage the IAB-DU, and perform UE context-related configuration.

[0242] It should be understood that Figure 2c and Figure 2d In the present invention, the UE and the IAB node communicate with each other through the Uu interface, and different IAB nodes communicate with each other through a backhaul link (BL).

[0243] The following Figure 2e , introduces the process of IAB node integration. Figure 2e In the example, taking the network access process of IAB-node2, IAB-node1 is the parent node of IAB-node2 and has been connected to the network.

[0244] The IAB node access process can be summarized as follows:

[0245] Step 1: For cells that support the IAB function, the iab-support information element will be broadcast in SIB1. IAB-MT will select the cell with the iab-support information element in SIB1 for access, establish an RRC connection with the donor, and indicate that it is an IAB node when establishing the RRC connection (carrying IAB node indication in the RRCSetupComplete message). When the donor-CU sends the UE initial message (INITIAL UE MESSAGE) to the core network (specifically, it can be the AMF network element in the core network), it also carries the IAB node indication. The AMF authenticates the IAB-MT and carries the IAB Authorized information element in the message (INITIAL CONTEXT SETUP REQUEST) instructing the donor-CU to establish the UE initial context for the IAB-MT, and authorizes the IAB node. If the authentication is successful, the value of IABAuthorized is authorized, otherwise IAB authorized is not authorized. Since the network access process of the IAB node is introduced here, it is assumed that the value of IAB Authorized is authorized and proceed to the subsequent steps.

[0246] Step 2-1: donor-CU configures the backhaul link RLC channel (BH RLCChannel) and performs routing configuration for IAB-node through RRC message. Specifically, only a default BH RLC Channel and a default route are configured at this time for the initial establishment of the F1 interface (e.g., step 3). After the F1 interface is established, more BH RLC Channels and routing paths can be configured to IAB-node through F1-C message for subsequent use of more F1-C messages and F1-U user plane data.

[0247] Step 2-2: In addition to configuring IAB-node2 in step 2-1, in step 2-2, routing updates can be performed on the nodes between IAB-node and donor (IAB-node1) to inform these nodes how to select the next-hop link and next-hop RLC Channel when receiving data packets from IAB-node2 or sending data packets to IAB-node2.

[0248] Step 3: IAB-DU2 in IAB-node2 uses the default configuration obtained in step 2-1 to send an F1 SETUP REQUEST message to donor-CU, carrying the cell configuration information under DU2, and requesting to establish the F1 interface. Donor-CU replies F1 SETUP RESPONSE to IAB-DU2, activates the cell, and completes the establishment of the F1 interface. At this point, IAB-node2 has been activated and can provide services for terminal devices and / or the next-hop IAB-MT.

[0249] The following Figure 2f , Figure 2g and Figure 2h This section describes the migration process of IAB nodes.

[0250] like Figure 2f FIG. 1 is an example of implementing partial migration of an IAB node. Figure 2f In the example, the IAB node where migration occurs can be called a boundary node, such as the mAB in the figure.

[0251] exist Figure 2f Before executing Partial migration, there is an RRC connection between the MT in the mAB (denoted as mAB-MT) and CU1, and there is an F1 interface between the DU in the mAB (denoted as mAB-DU) and CU1. to communicate.

[0252] exist Figure 2f In the process of partial migration, the mAB-MT undergoes cross-CU cell switching and establishes an RRC connection with CU2. However, in order to avoid the introduction of the F1 interface re-establishment process, the mAB-DU still maintains the F1 interface with CU1 and does not establish the F1 interface with CU2. Therefore, the communication path between CU1 and the mAB-DU becomes cross-topology:

[0253] Optionally, in Figure 2fIn the example, CU1 and CU2 are respectively referred to as F1-terminating CU and non-F1-terminating CU (or RRCterminating CU), and can also be referred to as source CU and target CU. It should be noted that data does not pass through CU2 when transmitted on the cross-topology path, and CU1 and Donor-DU2 can communicate directly through the IP network.

[0254] In addition, Figure 2f In the example, when there is traffic transmission between CU1 and UE, CU1 can send IAB TRANSPORTMIGRATION MANAGEMENT REQUEST message to CU2. The purpose of this message is to let CU2 help CU1 transmit traffic between CU1 and UE. That is, F1 terminating CU sends IAB TRANSPORT MIGRATIONMANAGEMENT REQUEST message to non F1-terminating CU to request to establish cross-topology traffic transmission. If non F1-terminating CU agrees to establish, it replies IAB TRANSPORT MIGRATION MANAGEMENT RESPONSE message to F1 terminating CU. If it disagrees, it replies IAB TRANSPORT MIGRATION MANAGEMENT REJECT message. If F1terminating CU or non F1-terminating CU wants to modify or withdraw QoS of traffic, it can also exchange IAB TRANSPORT MIGRATION MODIFICATION REQUEST / RESPONSE messages.

[0255] like Figure 2g As shown in FIG. 2G , an implementation example of the IAB node performing consecutive partial migration is shown in FIG. 2G . In FIG. 2G , the miAB node that undergoes migration may be a migration caused by its own movement.

[0256] exist Figure 2g In the example, migration 1 indicates the transition between mAB-DU and CU1. Figure 2g The migration process shown, from the source communication path Migrate to target communication path process.

[0257] After Migration 1, the mAB-DU can perform the next migration process, namely, Migration 2. That is, the mAB-MT switches from CU2 to CU3, but the F1 interface of the DU is always associated with CU1. Figure 2g As shown, the mAB-node is directly connected to the donor-DU, but this is not limited. There may be other IAB nodes between the mAB-node and the donor-DU. In addition, regarding how the MT arrives at CU2, the MT may be switched from CU1 to CU2, but it may also be switched from other CUs to CU2 (not shown in the figure, which can be understood in conjunction with the DU migration scenario below).

[0258] like Figure 2h As shown, it is an implementation example of the IAB node performing DU migration.

[0259] Considering the large-scale mobility of IAB nodes (such as mAB nodes), when the mAB-node moves far away, the mAB-DU may find it difficult to maintain an IP connection with the original CU, or the transmission delay may be very large. Therefore, in order to support large-scale mobility, DU migration can be introduced. Figure 2h As shown, the RRC connection of MT can always be on CU2, and the F1 interface of DU is migrated from CU1 to CU3. The figure shows mAB-DU1 and mAB-DU2, which are two logical DUs on a physical DU. DU migration is achieved in this way: assuming that the source DU is mAB-DU1, mAB-node generates a new logical DUmIAB-DU2, and mAB-DU2 establishes an F1 interface with CU3. CU1 sends a terminal device switching request to CU3, switching the terminal device from the cell under mAB-DU1 to the cell under mAB-DU2, and then CU1 releases the F1 interface between it and mAB-DU1. At this point, DU migration is completed.

[0260] In other words, the DU migration in the IAB node can be completely decoupled from the MT migration in the IAB node, that is, the CU connected to the DU in the IAB node and the CU connected to the MT in the IAB node can be different. Therefore, in consecutive partial migration, if the F1 terminating CU of the DU is always CU1, the MT does not necessarily switch from CU1 to CU2 (although this is also possible); in DU migration, the MT can be in CU2, and the DU migrates from CU1 to CU3 (this is a common case, as a special case, CU2 can be the same CU as CU1 or CU3). The reason why it is assumed that the DU migration in the IAB node is completely decoupled from the migration of the MT in the IAB node is because the process of DU migration in the IAB node is relatively complicated (it is necessary to generate two logical DUs and switch the UEs to the new logical DUs one by one), and the DU in the IAB node is generally not suitable for frequent migration. The CU connected to the DU in the IAB node can be a CU with a relatively large control range; and the migration of the MT in the IAB node is the switching of the MT, which may be performed frequently. The selection of the CU connected to the MT in the IAB node may be determined by the signal quality, that is, the CU connected to the MT in the IAB node may be different from the CU connected to the DU in the IAB node.

[0261] Optionally, based on the possibility of completely decoupling the DU migration in the above-mentioned IAB node from the MT migration in the IAB node, during the IAB integration process, the RRC connection of the MT in the IAB node and the F1 interface of the DU in the IAB node can be terminated on different CUs (e.g., the CU connected to the DU in the IAB node can be a CU with a larger control range, and the CU connected to the MT in the IAB node is the CU corresponding to the cell with the best signal quality). In other words, once the IAB node enters the network, a Figure 2f topology, that is, the data transmission of mAB-DU needs to be transmitted through the CU connected by mAB-MT for cross-topology traffic transmission.

[0262] From the above implementation process, it can be seen that the CU connected to the DU in the IAB node and the CU connected to the MT in the IAB node may not be the same CU. In this case, how to implement data transmission in the IAB node is a technical problem that needs to be solved urgently. Figure 2fFor example, the data transmission of mAB-DU can be carried out through cross-topology traffic transmission through the CU connected to mAB-MT. However, the traffic transmission process needs to be determined through the interaction process of IAB TRANSPORT MIGRATION MANAGEMENT REQUEST / RESPONSE messages between CU1 and CU2 (i.e., IAB TRANSPORT MIGRATION MANAGEMENT process). For CU1, how to determine which CU is CU2 is an unresolved technical problem.

[0263] In order to solve the above problems, the present application provides a communication method and related equipment, which is used to determine the identity of the first CU connected to the MT in the mAB node through the information sent by the DU connected to the mAB node, and realize the data transmission of the mAB node in the topology of the first CU based on the identity of the first CU. The following will be described in detail with reference to the accompanying drawings.

[0264] See also Figure 3 , is a schematic diagram of the communication method provided in this application, and the method includes the following steps.

[0265] It should be noted that Figure 3 In the example, the second CU, the first IAB node, the DU, and the first CU are used as the execution subjects of the interaction diagram to illustrate the method, but the present application does not limit the execution subjects of the interaction diagram. Figure 3 In the corresponding implementation method, the implementation process of step S301 can be executed by the DU, or by a chip, chip system, or processor that supports the DU to implement the method, or by a logic module or software that can implement all or part of the DU functions. Figure 3 In the corresponding implementation, the implementation process of step S301-step S302 can be performed by the first IAB node, or by a chip, a chip system, or a processor that supports the first IAB node to implement the method, or by a logic module or software that can implement all or part of the functions of the first IAB node. Correspondingly, the first CU (and / or the second CU) that executes other steps can also be replaced by a chip, a chip system, a processor logic module or software in the first CU (and / or the second CU).

[0266] Similarly, in the following Figure 4 Figure 5 Figure 6 In each of the steps shown, the device executing the method (eg, the second CU, the first IAB node, the DU, the first CU, etc.) may also be replaced by a chip, a chip system, a processor logic module or software in each device.

[0267] S301. A DU sends first information, and correspondingly, a first IAB node receives the first information, wherein the first information is used to determine an identifier of a first CU, and the DU connected to the first CU includes a first cell, and the first cell is a cell that supports access of the mIAB node.

[0268] S302. The first IAB node sends third information, and correspondingly, the second CU receives the third information, wherein the third information includes an identifier of the first CU, and the identifier of the first CU is used to establish data transmission for the first IAB node in the topology of the first CU, and the first IAB node is an mIAB node.

[0269] S303: Data transmission is performed between the first CU and the second CU.

[0270] In this application, the mIAB node can be understood as an IAB node with mobility. For example, with the ground as the reference system, the mIAB node can be an IAB node that may move relative to the ground, such as a vehicle-mounted device, a mobile station, a mobile station, etc. Among them, the mIAB node can be replaced by an IAB node with mobility, an IAB node with mobility attributes, an IAB node, etc.

[0271] It should be understood that the DU connected to the first CU includes one or more cells (for example, the first cell), which can be understood as the signals of the one or more cells are sent and received through the DU. That is, the DU includes one or more cells, which can be replaced by the DU corresponding to one or more cells, the one or more cells are generated by the DU, and the DU generates the one or more cells, etc.

[0272] It should be understood that the CU connected to the MT in the mAB node is the first CU, and the connection between the MT and the first CU can be an RRC connection; the CU connected to the DU in the mAB node can be the second CU, and the connection between the DU and the second CU can be an F1 connection. Accordingly, for the mAB node, the F1 connection terminates at the second CU, that is, the second CU can be called the F1-terminating CU of the mAB node, the first CU can be called the non-F1-terminating CU of the mAB node, or the first CU can be called the RRC terminating CU of the mAB node.

[0273] It should be understood that there may be N (N is a natural number) hop intermediate nodes (i.e., N-hop IAB intermediate nodes) between the mIAB node and the IAB host node. Wherein, when N is 0, the DU that sends the first information in step S301 is the IAB donor DU in the IAB host node; when N is 1, the DU that sends the first information in step S301 is the DU of the intermediate node between the IAB host node and the mIAB node; when N is greater than 1, the DU that sends the first information in step S301 is the DU in the intermediate node connected to the mIAB node among the N intermediate nodes between the IAB host node and the mIAB node, i.e., there may be N-1 hop intermediate nodes between the DU in the intermediate node connected to the mIAB node and the IAB host node.

[0274] It should be noted that the identifier of the first CU is used to establish data transmission in the topology of the first CU for the mAB node accessing the first cell. It can be understood that the data transmission between the DU in the mAB node and the second CU passes through the topology of the first CU. The mAB node can send the third information including the identifier of the first CU to the second CU in step S302, so that the second CU can interact with the first CU based on the identifier of the first CU (for example, the above Figure 2f Through the interaction process, resources for transmitting traffic between the DU of the mIAB and the second CU can be established in the topology of the first CU.

[0275] In other words, in step S303, the second CU may transmit data of the first IAB node through the topology of the first CU. For example, the DU in the first IAB node may send data to the second CU through the DU connected to the first CU; for another example, the second CU may send data to the DU in the first IAB node through the DU connected to the first CU.

[0276] In an implementation example, taking the DU connected to the mAB node (i.e., the DU sending the first information) as the IAB host DU as an example, the data transmission path between the DU in the mAB node and the second CU may include: DU in the mAB node→MT in the mAB node→IAB host DU connected to the mAB node→second CU.

[0277] In another implementation example, taking the DU connected to the mAB node (i.e., the DU sending the first information) as an example, which is not the IAB host DU, the data transmission path between the DU in the mAB node and the second CU may include: DU in the mAB node → MT in the mAB node → DU connected to the mAB node → N-1 (N is a natural number) hop intermediate node → IAB host DU → second CU.

[0278] In the above example, the IAB host DU and the first CU are located in the IAB host node connected to the MT, and in the data transmission path between the DU in the above mIAB node and the second CU, the path involving the IAB host DU can be negotiated and determined through the process interaction between the first CU and the second CU (for example, the process can be the mobile access backhaul integrated transport migration management (IABTRANSPORTMIGRATIONMANAGEMENT) process). To this end, the way in which the DU connected to the mIAB node sends the first information enables the mIAB node to determine the identifier of the first CU based on the first information, and based on the identifier of the first CU, enables the first CU and the second CU to implement the above process interaction, and then realizes the data transmission of the mIAB node through the data transmission path.

[0279] Optionally, the path between the IAB host DU and the second CU may transmit data via an Internet Protocol (IP) network, that is, data may be transmitted between the DU connected to the first CU and the second CU via an IP network.

[0280] In a possible implementation manner, the first information includes at least one of the following:

[0281] an identifier of the first CU;

[0282] The length of the identifier of the first CU, wherein the length of the identifier of the first CU is used to determine the identifier of the first CU according to the second identifier, and the second identifier is composed of the identifier of the first CU and the identifier of the first cell;

[0283] The length of the identifier of the first cell, wherein the length of the identifier of the first cell is used to determine the identifier of the first CU according to the second identifier.

[0284] Optionally, the identifier of the first CU may be an identifier of a network device where the first CU is located. For example, in a new radio (NR) system, the network device where the first CU is located may be a gNB, that is, the identifier of the network device where the first CU is located may be an identifier of the gNB (for example, a gNB ID and / or an IP address).

[0285] Optionally, in a new radio (NR) system, the second identifier may be a new radio cell global identifier (NCGI). For example, the identifier of the first CU may be recorded as a gNB ID, and the NCGI may be composed of a gNB ID+cell ID. The length of the gNB ID is variable (22 to 32). For this reason, after the mIAB node obtains the length of the gNB ID (i.e., the length of the identifier of the first CU), the mIAB node may read the value of the gNB ID according to the NCGI.

[0286] Optionally, when the first information is the length of the identifier of the first CU (for example, the first information is carried in the gNB-ID-Length information element in SIB1), compared with the implementation method in which the first information includes the identifier of the first CU, the number of bits occupied by the first information can be reduced, thereby reducing overhead.

[0287] based on Figure 3 In the technical solution shown, the first information sent by the DU in step S301 is used to determine the identifier of the first CU connected to the DU, and the identifier of the first CU is used to establish data transmission in the topology of the first CU for the mAB node accessing the first cell. Among them, the first cell included in the DU is a cell that supports the access of the mAB node, that is, the first CU connected to the DU is the CU connected to the MT in the mAB node. In other words, after the DU sends the first information, the MT in the mAB node can determine the identifier of the first CU based on the first information, and the DU in the subsequent mAB node can establish data transmission in the topology of the first CU based on the identifier of the first CU in steps S302 and S303. Thus, in the case where the CU connected to the DU in the mAB node and the CU connected to the MT in the mAB node are not the same CU, the mAB node can determine the identifier of the first CU connected to the MT in the mAB node based on the information sent by the DU connected to the mAB node, and implement data transmission of the mAB node in the topology of the first CU based on the identifier of the first CU.

[0288] In one possible implementation, Figure 3 In step S301 of the method shown, the DU may send the first information in a variety of ways, which will be described below through some implementation examples.

[0289] Implementation example 1: In step S301, under the condition that the DU determines that the first cell is a cell supporting access of the mAB node (or, under the condition that the broadcast message sent by the DU indicates that the first cell is a node supporting the mAB node), the DU sends the first information.

[0290] Specifically, under the condition that the first cell in the DU supports the access of the mAB node, the DU can send an identifier for determining the first CU, so that after the mAB node accesses the cell that supports the access of the mAB node, it can determine the identifier of the first CU through the first information, thereby realizing data transmission of the mAB node in the topology of the first CU.

[0291] Optionally, the cells included in the DU may include a second cell in addition to the first cell. Under the condition that the DU determines that the second cell does not support access to the mIAB node, the DU may not send the first information corresponding to the second cell, that is, the second cell does not support access to the mIAB node, so that the DU does not need to send information for determining the identifier of the CU connected to the MT in the mIAB node accessed by the second cell.

[0292] Implementation Example 2: Before the DU sends the first information in step S301, Figure 4 As shown, the method also includes:

[0293] Step A: The first CU sends the second information, and the DU receives the second information accordingly. The second information satisfies at least one of the following:

[0294] The second information is used to indicate that the mIAB node is allowed to access the first cell;

[0295] The second information is used to indicate that the mIAB node is not prohibited from accessing the first cell;

[0296] The second information is used to instruct to send the first information;

[0297] Thereafter, in step S301, the DU determines to send the first information based on the second information received in step A.

[0298] Optionally, the second information is carried in the gNB-CU configuration update message GNB-CU CONFIGURATION UPDATE. For example, by carrying the value of the mobile IAB barred information element as not barred, it indicates whether the mIAB node access is allowed or not.

[0299] In a possible implementation of Example 2, Figure 4 Before step A shown, the method may further include: the first IAB node sends a first message, and accordingly, after the DU receives the first message, the DU may send the first message to the first CU. The first message is used to indicate that the RRC connection establishment of the first IAB node is completed; the first message includes indication information for indicating that the first IAB node is an mIAB node; thereafter, the first CU may determine to send the second information based on the first message.

[0300] Optionally, the first message may be referred to as message 5 (message 5, MSG5) or an RRC Setup Complete (RRCSetupComplete) message.

[0301] Specifically, after the first IAB node establishes an RRC connection with the first CU through the DU, the first CU may receive a message through the DU indicating that the RRC connection establishment of the first IAB node is complete. In addition, the first message includes indication information indicating that the first IAB node is an mIAB node, so that the first CU determines that an mIAB node has accessed the first CU through the DU. To this end, the first CU may determine to send the second information based on the first message, so that the DU can send the first information based on the second information, so that the mIAB node can realize the data transmission of the mIAB node in the topology of the first CU through the first information.

[0302] It should be understood that after receiving the first message, the DU may also read the mIAB indication information in the first message because the DU may have certain RRC capabilities. Alternatively, the subsequent DU may forward the first message to the first CU, so that the first CU determines that the RRC connection establishment of the first IAB node is completed through the first message.

[0303] Optionally, since the first IAB node sends the first message to the first CU via the DU, the DU can also clearly know that the existing mAB node has accessed the DU based on the first message. Therefore, the DU can send the first message in step S301 without being triggered by the second message, so that the mAB node can realize the data transmission of the mAB node in the topology of the first CU through the first message. In other words, Figure 4 In the implementation process shown, step A is an optional step. For the DU, after the DU receives the first message, step S301 can be executed.

[0304] In a possible implementation of Example 2, in addition to the triggering of the first message, the first CU may also determine to send the second information based on other methods. For example, the other methods may include at least one of the following conditions 1 to 8.

[0305] In order to facilitate the understanding of the following conditions 1 to 8, we will first Figure 5a , Figure 5b and Figure 5c Describes the IAB process related to some conditions.

[0306] like Figure 5a As shown, the implementation process of the initial access of the mAB node includes the following steps.

[0307] Step 1-1, the mAB-MT sends a MSG5 message (ie, the first message mentioned above, ie, the RRCSetupComplete message) to the donor-CU through the DU, carrying indication information for indicating that the IAB node sending the MSG5 message is the mAB node.

[0308] Step 1-2: The donor-CU sends an INITIAL UE MESSAGE message to the AMF serving the mIAB-MT.

[0309] Step 1-3: The AMF network element serving mIAB-MT sends an INITIAL CONTEXT SETUP REQUEST message to the donor-CU, carrying the indication information that the mobile IAB is authorized (mobile IAB authorized = authorized).

[0310] It should be understood that Figure 5a In the example, mAB-MT is the MT in the mAB node, and donor-CU is an implementation example of the first CU in the preceding text.

[0311] like Figure 5b As shown, the implementation process of the mAB node switching from the source donor-CU to the target donor-CU includes the following steps.

[0312] Step 2-1: The source donor-CU sends a HANDOVERREQUEST message about the mIAB-MT to the target donor-CU, carrying at least one of mobile IAB indication information (mobile IAB indication) and mobile IAB authorized indication information (mobile IAB authorized=authorized).

[0313] Step 2-2: Perform other steps of mAB-MT handover, such as MT randomly accesses the topology of the target donor-CU and establishes an RRC connection. The target donor-CU sends a PATH SWITCH REQUEST message to the AMF, requesting the AMF to change the transmission path from the source donor-CU to the target donor-CU.

[0314] Step 2-3: AMF replies to the target donor-CU with a PATH SWITCH REQUEST ACK message, carrying the indication that the mobile IAB is authorized (mobile IAB authorized = authorized). The existing conclusion has agreed to carry the latest authorization status of the mobile IAB switched to the target donor-CU in the PATH SWITCH REQUEST ACK message, because whether the mobile IAB is authorized (allowed to work) may be related to the base station it is connected to. When it arrives at the target donor-CU, the AMF will carry the latest authorization information in the PATH SWITCH REQUEST ACK message.

[0315] It should be understood that Figure 5b In the example, the target donor-CU is an implementation example of the first CU mentioned above.

[0316] like Figure 5c As shown, it is the implementation process of changing the authorization status of mIAB-node from unauthorized to authorized under donor-CU.

[0317] Step 3-1: mIAB-node is in unauthorized state.

[0318] Step 3-2: The AMF serving the mIAB-MT sends an indication to the donor-CU that the authorization status of the mIAB has changed from unauthorized to authorized. For example, the UE CONTEXT MODIFICATION REQUEST message carries the indication that the mobile IAB has passed the authorization (mobile IAB authorized = authorized). For example, whether the mobile IAB is authorized may be related to the time information, so it is possible that the mobile IAB changes from unauthorized to authorized (or vice versa) under a certain donor-CU.

[0319] Conditions 1 to 8 described above will be described below.

[0320] Condition 1: The first CU receives first indication information from the DU, where the first indication information is used to indicate that the system information of the serving cell does not include the first information. Alternatively, the DU broadcasts the system information of the first cell, where the system information of the first cell does not include the first information.

[0321] Specifically, before the DU sends the first information, the DU may send the first indication information and / or the system information of the first cell, so that the first CU can determine that the system information of the first cell does not include the first information based on the first indication information and / or the system information of the first cell. Thereafter, after the first CU determines that the system information of the first cell does not include the first information, the first CU may send the second information to the DU in step A, so that the DU can determine to send the first information based on the indication of the second information, so that the mAB node accessing the DU can realize the data transmission of the mAB node in the topology of the first CU through the first information.

[0322] Condition 2: The first CU receives second indication information from a core network element, where the second indication information is used to indicate that the authorization of the mAB node is passed.

[0323] Optionally, the second indication information is carried in Figure 5a Steps 1-3 in, or, the second indication information is carried in Figure 5b Alternatively, the second indication information is carried in step 2-3 of Figure 5c Follow step 3-2 in the previous step.

[0324] Specifically, after the first CU receives the second indication information, the first CU can determine that the DU connected to the first CU needs to provide services for the mAB node. To this end, the first CU can send the second information to the DU in step A, so that the DU can determine to send the first information based on the indication of the second information, so that the mAB node accessing the DU can realize data transmission of the mAB node in the topology of the first CU through the first information.

[0325] Condition 3. The first CU is Figure 5b In step 2-2 of the flow shown, the second indication information and / or the third indication information from the source CU of the MT in the first IAB node is received, and the third indication information is used to indicate that the first IAB node is an mIAB node and the first CU is a target CU of the MT in the first IAB node.

[0326] Specifically, after the first CU receives the second indication information and / or the third indication information, the first CU can determine that the DU connected to the first CU is likely to access the mAB node. To this end, the first CU can send the second information to the DU in step A, so that the DU can determine to send the first information based on the indication of the second information, so that the mAB node accessing the DU can realize data transmission of the mAB node in the topology of the first CU through the first information.

[0327] Condition 4: The first CU determines that the first CU is not an F1-terminating centralized unit (F1-terminating CU) of the first IAB node.

[0328] Condition 5. The first CU receives fourth indication information from the third CU, where the fourth indication information is used to indicate that the third CU is the F1-terminating CU of the first IAB node.

[0329] Condition 6: The first CU receives fifth indication information from the MT in the first IAB node, where the fifth indication information is used to indicate that the first CU is not the F1-terminating CU of the first IAB node.

[0330] Specifically, through any one of conditions 4 to 6, the first CU determines that it is not the F1-terminating CU of the DU in the mAB node. Since the first CU is the CU connected to the MT in the mAB node (i.e., the RRC terminating CU), the first CU can determine that the data between the DU in the mAB node and the F1-terminating CU may need to be transmitted through the topology of the first CU. To this end, the first CU can send the second information to the DU in step A, so that the DU can determine to send the first information based on the indication of the second information, so that the mAB node accessing the DU can realize the data transmission of the mAB node in the topology of the first CU through the first information.

[0331] Condition 7. The first CU determines that the DU in the first IAB node is to perform DU migration. The implementation process of DU migration can refer to the previous article. Figure 2h Description.

[0332] Optionally, in condition 7, the first CU may determine that the DU in the first IAB node is to perform DU migration based on a variety of methods, for example, the first CU receives indication information from a CU (or an MT in the first IAB node) to which the DU in the first IAB node is connected before performing DU migration, and the indication information is used to indicate that the DU in the first IAB node is to perform DU migration.

[0333] Specifically, when the first CU determines that the DU in the first IAB node is going to perform DU migration, the first CU can determine that the DU in the first IAB node and the MT in the first IAB node are likely to be connected to different CUs, that is, the CU connected to the DU in the first IAB node and the CU connected to the MT in the first IAB node are likely to be different CUs. To this end, the first CU can send the second information to the DU in step A, so that the DU can determine to send the first information based on the indication of the second information, so that the mAB node accessing the DU can realize the data transmission of the mAB node in the topology of the first CU through the first information.

[0334] Condition 8: The first CU receives sixth indication information from the MT in the first IAB node or the F1-terminatingCU of the first IAB node, where the sixth indication information is used to indicate a request for the first information.

[0335] Specifically, the MT in the first IAB node or the F1-terminating CU of the first IAB node may send the sixth indication information for indicating the request for the first information to the first CU, triggering the first CU to determine that the first information needs to be indicated to be sent to the DU. To this end, when at least one of the above items is met, the first CU may determine that the DU connected to the first CU may be accessed by the mAB node. To this end, the first CU may send the second information to the DU in step A, so that the DU can determine to send the first information based on the indication of the second information, so that the mAB node accessing the DU can realize the data transmission of the mAB node in the topology of the first CU through the first information.

[0336] Optionally, in condition 8, when the sixth indication information comes from the F1-terminating CU of the first IAB node, the F1-terminating CU of the first IAB node may be the F1-terminating CU before DU migration. Figure 2h In the scenario shown, the first IAB node may be Figure 2h In the mAB node in the first IAB node, the DU in the first IAB node can be switched from CU1 to CU3; accordingly, in condition 8, the sixth indication information may come from CU1, so that CU2 instructs DU2 to execute Figure 6 As shown in step S301, the MT in the first IAB node can obtain the identifier of CU2, and in step S302, the third information is sent to CU3, so that the subsequent mIAB nodes can perform data transmission through the topology of CU2.

[0337] Optionally, in implementation example 1 and implementation example 2, the first cell is any cell in the DU that supports access of the mIAB node; or, the first cell is a cell to which the mIAB node in the DU accesses.

[0338] Optionally, in implementation example 1 and implementation example 2, the first information sent by the DU in step S301 is carried in the system broadcast message of the first cell. Specifically, the first information sent by the DU can be carried in the system broadcast message of the first cell, and the first information is transmitted by broadcasting, so that multiple mAB nodes can receive the first information sent by the broadcast to save overhead. For example, the system broadcast information can be SIB1.

[0339] In a possible implementation of Example 1 and Example 2, before the DU determines the first information in step S301, the method further includes: receiving indication information configured by the network management for indicating the identifier of the first CU or the identifier length of the identifier of the first CU; and / or, receiving indication information from the first CU for indicating the identifier of the first CU or the identifier length of the identifier of the first CU. Specifically, the DU can obtain the identifier of the first CU or the identifier length of the identifier of the first CU by means of network management configuration or by receiving configuration from the first CU, so that the DU can send the first information based on the identifier of the first CU or the identifier length of the identifier of the first CU.

[0340] Optionally, the network management configuration method can be understood as a pre-configuration method.

[0341] Implementation example 3: Before the DU sends the first information in step S301, Figure 6 As shown, the method also includes:

[0342] Step B: The first CU sends the first information, and correspondingly, the DU receives the first information, wherein the first information is carried in an RRC message.

[0343] Optionally, the first information is carried in an RRC message, which may be replaced by the first information being carried in a unicast message.

[0344] It should be understood that since the communication protocol stack supported by the DU includes the PHY layer, the MAC layer, the RLC layer, etc., but does not include the RRC layer; therefore, the first information received by the DU in step B and the first information sent by the DU in step S301 can be messages encapsulated by the PHY layer / MAC layer / RLC layer. Thus, the DU can forward the first information in such a way that the mIAB node accessing the DU obtains the first information.

[0345] It should be noted that in Figure 6In the implementation process shown, the first CU may also determine to send the first information carried in the RRC message based on at least one of the following conditions 1 to 8. A detailed description will be given below.

[0346] Condition 1: The first CU receives first indication information from the DU, where the first indication information is used to indicate that the system information of the serving cell does not include the first information. Alternatively, the DU broadcasts the system information of the first cell, where the system information of the first cell does not include the first information.

[0347] Specifically, before the DU sends the first information, the DU may send the first indication information and / or the system information of the first cell, so that the first CU can determine that the system information of the first cell does not include the first information based on the first indication information and / or the system information of the first cell. Thereafter, after the first CU determines that the system information of the first cell does not include the first information, the first CU may send the first information carried in the RRC message to the first IAB node through the DU in step B. Since the first IAB node is an mIAB node, the mIAB node can realize data transmission in the topology of the first CU through the first information.

[0348] Condition 2: The first CU receives second indication information from a core network element, where the second indication information is used to indicate that the authorization of the mAB node is passed.

[0349] Optionally, the second indication information is carried in Figure 5a Steps 1-3 in, or, the second indication information is carried in Figure 5b Alternatively, the second indication information is carried in step 2-3 of Figure 5c Follow step 3-2 in the previous step.

[0350] Specifically, after the first CU receives the second indication information, the first CU can determine that the DU connected to the first CU needs to provide services for the mAB node. To this end, the first CU can send the first information carried by the RRC message to the first IAB node through the DU in step B. Since the first IAB node is an mAB node, the mAB node can realize data transmission in the topology of the first CU through the first information.

[0351] Condition 3. The first CU is Figure 5b In step 2-2 of the flow shown, the second indication information and / or the third indication information from the source CU of the MT in the first IAB node is received, and the third indication information is used to indicate that the first IAB node is an mIAB node and the first CU is a target CU of the MT in the first IAB node.

[0352] Specifically, after the first CU receives the second indication information and / or the third indication information, the first CU can determine that the DU connected to the first CU is likely to access the mAB node. To this end, the first CU can send the first information carried by the RRC message to the first IAB node through the DU in step B. Since the first IAB node is an mAB node, the mAB node can realize data transmission in the topology of the first CU through the first information.

[0353] Condition 4: The first CU determines that the first CU is not an F1-terminating centralized unit (F1-terminating CU) of the first IAB node.

[0354] Condition 5. The first CU receives fourth indication information from the third CU, where the fourth indication information is used to indicate that the third CU is the F1-terminating CU of the first IAB node.

[0355] Condition 6: The first CU receives fifth indication information from the MT in the first IAB node, where the fifth indication information is used to indicate that the first CU is not the F1-terminating CU of the first IAB node.

[0356] Specifically, through any one of conditions 4 to 6, the first CU determines that it is not the F1-terminating CU of the DU in the mAB node. Since the first CU is the CU connected to the MT in the mAB node (i.e., the RRC terminating CU), the first CU can determine that the data between the DU in the mAB node and the F1-terminating CU may need to be transmitted through the topology of the first CU. To this end, the first CU can send the first information carried by the RRC message to the first IAB node through the DU in step B. Since the first IAB node is an mAB node, the mAB node can realize data transmission in the topology of the first CU through the first information.

[0357] Condition 7. The first CU determines that the DU in the first IAB node is to perform DU migration. The implementation process of DU migration can refer to the previous article. Figure 2h Description.

[0358] Optionally, in condition 7, the first CU may determine that the DU in the first IAB node is to perform DU migration based on a variety of methods, for example, the first CU receives indication information from a CU (or an MT in the first IAB node) to which the DU in the first IAB node is connected before performing DU migration, and the indication information is used to indicate that the DU in the first IAB node is to perform DU migration.

[0359] Specifically, when the first CU determines that the DU in the first IAB node is going to perform DU migration, the first CU can determine that the DU in the first IAB node and the MT in the first IAB node are likely to be connected to different CUs, that is, the CU connected by the DU in the first IAB node and the CU connected by the MT in the first IAB node are likely to be different CUs. To this end, the first CU can send the first information carried in the RRC message to the first IAB node through the DU in step B. Since the first IAB node is an mIAB node, the mIAB node can realize data transmission in the topology of the first CU through the first information.

[0360] Condition 8: The first CU receives sixth indication information from the MT in the first IAB node or the F1-terminatingCU of the first IAB node, where the sixth indication information is used to indicate a request for the first information.

[0361] Specifically, the MT in the first IAB node or the F1-terminating CU of the first IAB node may send sixth indication information for indicating a request for the first information to the first CU, triggering the first CU to determine that it is necessary to indicate to the DU to send the first information. To this end, when at least one of the above items is met, the first CU may determine that the DU connected to the first CU may be accessed by the mAB node. To this end, the first CU may send the first information carried in the RRC message to the first IAB node through the DU in step B. Since the first IAB node is an mAB node, the mAB node can realize data transmission in the topology of the first CU through the first information.

[0362] Optionally, in condition 8, when the sixth indication information comes from the F1-terminating CU of the first IAB node, the F1-terminating CU of the first IAB node may be the F1-terminating CU before DU migration. Figure 2h In the scenario shown, the first IAB node may be Figure 2hIn the mAB node in the first IAB node, the DU in the first IAB node can be switched from CU1 to CU3; accordingly, in condition 8, the sixth indication information may come from CU1, so that CU2 instructs DU2 to execute Figure 6 As shown in step S301, the MT in the first IAB node can obtain the identifier of CU2, and in step S302, the third information is sent to CU3, so that the subsequent mIAB nodes can perform data transmission through the topology of CU2.

[0363] See also Figure 7 The embodiment of the present application provides a communication device 700, which can implement the functions of the communication device in the above method embodiment (the communication device is a DU, a first CU or a first IAB node), and thus can also achieve the beneficial effects of the above method embodiment. In the embodiment of the present application, the communication device 700 can be a communication device, or an integrated circuit or component inside the communication device, such as a chip.

[0364] In a possible implementation, when the device 700 is used to perform the aforementioned Figure 3 When the method executed by DU in the related embodiments is used, the device 700 includes a processing unit 701 and a transceiver unit 702; the processing unit 701 is used to determine the first information, and the first information is used to determine the identifier of the first centralized unit CU. The distributed unit DU connected to the first CU includes a first cell, and the first cell is a cell that supports the access of the mobile access backhaul integrated mAB node; wherein the identifier of the first CU is used to establish data transmission in the topology of the first CU for the mAB node accessing the first cell; the transceiver unit 702 is used to send the first information.

[0365] In a possible implementation, when the device 700 is used to perform the aforementioned Figure 4 When the method is performed by the first CU in the related embodiments, the device 700 includes a processing unit 701 and a transceiver unit 702; the processing unit 701 is used to determine the second information, and the second information satisfies at least one of the following:

[0366] The second information is used to indicate that the mIAB node is allowed to access the serving cell;

[0367] The second information is used to indicate that the mIAB node is not prohibited from accessing the serving cell;

[0368] The second information is used to instruct sending the first information;

[0369] The transceiver unit 702 is used to send the second information, wherein the second information is used to determine the sending of the first information, the first information is carried in the system broadcast message of the service cell, the first information is used to determine the identifier of the first CU, and the DU connected to the first CU includes the service cell.

[0370] In a possible implementation, when the device 700 is used to perform the aforementioned Figure 6 When the method executed by the first CU in the related embodiments, the device 700 includes a processing unit 701 and a transceiver unit 702; the processing unit 701 is used to determine the first information based on at least one of the following, the first information is used to determine the identifier of the first CU, the DU connected to the first CU includes the service cell of the first access backhaul integrated IAB node, and the first IAB node is the mIAB node:

[0371] The transceiver unit 702 receives first indication information from the DU, where the first indication information is used to indicate that the system information of the serving cell does not include the first information;

[0372] The transceiver unit 702 receives second indication information from a core network element, where the second indication information is used to indicate that the authorization of the mAB node is passed;

[0373] The transceiver unit 702 receives the second indication information and / or the third indication information from the source CU of the MT in the first IAB node, where the third indication information is used to indicate that the first IAB node is an mIAB node and the first CU is a target CU of the MT in the first IAB node;

[0374] The processing unit 701 determines that the first CU is not an F1-terminating centralized unit F1-terminating CU of the first IAB node;

[0375] The transceiver unit 702 receives fourth indication information from the third CU, where the fourth indication information is used to indicate that the third CU is the F1-terminating CU of the first IAB node;

[0376] The transceiver unit 702 receives fifth indication information from the MT in the first IAB node, where the fifth indication information is used to indicate that the first CU is not the F1-terminating CU of the first IAB node;

[0377] The processing unit 701 determines that the DU in the first IAB node is to perform DU migration;

[0378] The transceiver unit 702 receives sixth indication information from the MT in the first IAB node or the F1-terminatingCU of the first IAB node, where the sixth indication information is used to indicate a request for the first information;

[0379] The transceiver unit 702 is used to send the first information, where the first information is carried in a radio resource control RRC message.

[0380] In a possible implementation, when the device 700 is used to execute the method executed by the first IAB node in any of the aforementioned embodiments, the device 700 includes a processing unit 701 and a transceiver unit 702; the transceiver unit 702 is used to receive first information, the first information comes from a service cell, and the first information is used to determine the identifier of the first CU. The DU connected to the first CU includes the service cell, and the service cell supports access to the mobile access backhaul integrated mAB node; the processing unit 701 is used to determine the identifier of the first CU based on the first information; the transceiver unit 702 is also used to send third information to the second CU connected to the DU in the first IAB node, and the third information includes the identifier of the first CU, wherein the identifier of the first CU is used to establish data transmission for the first IAB node in the topology of the first CU, and the first IAB node is an mAB node.

[0381] It should be noted that the information execution process and other contents of the units of the above-mentioned communication device 700 can be specifically referred to the description in the method embodiment shown in the above-mentioned application, and will not be repeated here.

[0382] See also Figure 8 , is another schematic structural diagram of a communication device 800 provided in the present application, wherein the communication device 800 includes a logic circuit 801 and an input / output interface 802. The communication device 800 may be a chip or an integrated circuit.

[0383] in, Figure 7 The transceiver unit 702 shown may be a communication interface, which may be Figure 8 The input / output interface 802 in the communication interface may include an input interface and an output interface. Alternatively, the communication interface may also be a transceiver circuit, which may include an input interface circuit and an output interface circuit.

[0384] Optionally, the logic circuit 801 is used to determine the first information, and the first information is used to determine the identifier of the first centralized unit CU, and the distributed unit DU connected to the first CU includes a first cell, and the first cell is a cell that supports access of the mobile access backhaul integrated mAB node; wherein, the identifier of the first CU is used to establish data transmission in the topology of the first CU for the mAB node accessing the first cell; the input and output interface 802 is used to send the first information.

[0385] Optionally, the logic circuit 801 is used to determine second information, where the second information satisfies at least one of the following:

[0386] The second information is used to indicate that the mIAB node is allowed to access the serving cell;

[0387] The second information is used to indicate that the mIAB node is not prohibited from accessing the serving cell;

[0388] The second information is used to instruct sending the first information;

[0389] The input-output interface 802 is used to send the second information, wherein the second information is used to determine the sending of the first information, the first information is carried in the system broadcast message of the service cell, the first information is used to determine the identifier of the first CU, and the DU connected to the first CU includes the service cell.

[0390] Optionally, the logic circuit 801 is used to determine first information based on at least one of the following, where the first information is used to determine an identifier of a first CU, where a DU connected to the first CU includes a service cell of a first access and backhaul integrated IAB node, and the first IAB node is an mIAB node:

[0391] The input / output interface 802 receives first indication information from the DU, where the first indication information is used to indicate that the system information of the serving cell does not include the first information;

[0392] The input / output interface 802 receives second indication information from a core network element, where the second indication information is used to indicate that the authorization of the mAB node is passed;

[0393] The input / output interface 802 receives the second indication information and / or the third indication information from the source CU of the MT in the first IAB node, where the third indication information is used to indicate that the first IAB node is an mIAB node and the first CU is a target CU of the MT in the first IAB node;

[0394] The logic circuit 801 determines that the first CU is not an F1-terminating centralized unit F1-terminating CU of the first IAB node;

[0395] The input / output interface 802 receives fourth indication information from the third CU, where the fourth indication information is used to indicate that the third CU is the F1-terminating CU of the first IAB node;

[0396] The input / output interface 802 receives fifth indication information from the MT in the first IAB node, where the fifth indication information is used to indicate that the first CU is not the F1-terminating CU of the first IAB node;

[0397] The logic circuit 801 determines that the DU in the first IAB node is going to perform DU migration;

[0398] The input / output interface 802 receives sixth indication information from the MT in the first IAB node or the F1-terminating CU of the first IAB node, where the sixth indication information is used to indicate a request for the first information;

[0399] The input / output interface 802 is used to send the first information, where the first information is carried in a radio resource control RRC message.

[0400] Optionally, the input-output interface 802 is used to receive first information, the first information comes from a service cell, the first information is used to determine the identifier of a first CU, the DU connected to the first CU includes the service cell, and the service cell supports access to the mobile access backhaul integrated mAB node; the logic circuit 801 is used to determine the identifier of the first CU based on the first information; the input-output interface 802 is also used to send third information to a second CU connected to the DU in the first IAB node, the third information includes the identifier of the first CU, wherein the identifier of the first CU is used to establish data transmission for the first IAB node in the topology of the first CU, and the first IAB node is an mAB node.

[0401] The logic circuit 801 and the input / output interface 802 may also execute other steps executed by the DU, the first CU or the first IAB node in any embodiment and achieve corresponding beneficial effects, which will not be described in detail here.

[0402] In one possible implementation, Figure 7 The processing unit 701 shown can be Figure 8 The logic circuit 801 in.

[0403] Optionally, the logic circuit 801 may be a processing device, and the functions of the processing device may be partially or completely implemented by software. The functions of the processing device may be partially or completely implemented by software.

[0404] Optionally, the processing device may include a memory and a processor, wherein the memory is used to store a computer program, and the processor reads and executes the computer program stored in the memory to perform corresponding processing and / or steps in any one of the method embodiments.

[0405] Alternatively, the processing device may include only a processor. A memory for storing a computer program is located outside the processing device, and the processor is connected to the memory via a circuit / wire to read and execute the computer program stored in the memory. The memory and the processor may be integrated together, or may be physically independent of each other.

[0406] Optionally, the processing device may be one or more chips, or one or more integrated circuits. For example, the processing device may be one or more field-programmable gate arrays (FPGA), application specific integrated circuits (ASIC), system on chip (SoC), central processor unit (CPU), network processor (NP), digital signal processor (DSP), microcontroller unit (MCU), programmable logic device (PLD) or other integrated chips, or any combination of the above chips or processors.

[0407] See also Fig. 9 , is a schematic diagram of the structure of the communication device 900 involved in the above embodiment provided in the embodiment of the present application. The communication device 900 may specifically be a communication device as a DU, a first CU or a first IAB node in the above embodiment. The structure of the communication device may refer to Fig. 9 The structure shown.

[0408] The communication device 900 includes at least one processor 911 and at least one network interface 914. Further optionally, the communication device also includes at least one memory 912, at least one transceiver 913 and one or more antennas 915. The processor 911, the memory 912, the transceiver 913 and the network interface 914 are connected, for example, through a bus. In an embodiment of the present application, the connection may include various interfaces, transmission lines or buses, etc., which are not limited in this embodiment. The antenna 915 is connected to the transceiver 913. The network interface 914 is used to enable the communication device to communicate with other communication devices through a communication link. For example, the network interface 914 may include a network interface between the communication device and the core network device, such as an S1 interface, and the network interface may include a network interface between the communication device and other communication devices (such as other network devices or core network devices), such as an X2 or Xn interface.

[0409] in, Figure 7 The transceiver unit 702 shown may be a communication interface, which may be Fig. 9 The network interface 914 in the embodiment may include an input interface and an output interface. Alternatively, the network interface 914 may also be a transceiver circuit, which may include an input interface circuit and an output interface circuit.

[0410] The processor 911 is mainly used to process the communication protocol and communication data, and to control the entire communication device, execute the software program, and process the data of the software program, for example, to support the communication device to perform the actions described in the embodiment. The communication device may include a baseband processor and a central processing unit. The baseband processor is mainly used to process the communication protocol and communication data, and the central processing unit is mainly used to control the entire terminal device, execute the software program, and process the data of the software program. Fig. 9 The processor 911 in the embodiment can integrate the functions of the baseband processor and the central processor. It can be understood by those skilled in the art that the baseband processor and the central processor can also be independent processors, which are interconnected through technologies such as buses. It can be understood by those skilled in the art that the terminal device can include multiple baseband processors to adapt to different network formats, and the terminal device can include multiple central processors to enhance its processing capabilities. The various components of the terminal device can be connected through various buses. The baseband processor can also be described as a baseband processing circuit or a baseband processing chip. The central processor can also be described as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data can be built into the processor, or it can be stored in the memory in the form of a software program, and the processor executes the software program to realize the baseband processing function.

[0411] The memory is mainly used to store software programs and data. The memory 912 can exist independently and be connected to the processor 911. Optionally, the memory 912 can be integrated with the processor 911, for example, integrated into a chip. Among them, the memory 912 can store program codes for executing the technical solutions of the embodiments of the present application, and the execution is controlled by the processor 911. The various types of computer program codes executed can also be regarded as drivers of the processor 911.

[0412] Fig. 9 Only one memory and one processor are shown. In an actual terminal device, there may be multiple processors and multiple memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be a storage element on the same chip as the processor, i.e., an on-chip storage element, or an independent storage element, which is not limited in the embodiments of the present application.

[0413] The transceiver 913 can be used to support the reception or transmission of radio frequency signals between the communication device and the terminal, and the transceiver 913 can be connected to the antenna 915. The transceiver 913 includes a transmitter Tx and a receiver Rx. Specifically, one or more antennas 915 can receive radio frequency signals, and the receiver Rx of the transceiver 913 is used to receive the radio frequency signal from the antenna, convert the radio frequency signal into a digital baseband signal or a digital intermediate frequency signal, and provide the digital baseband signal or the digital intermediate frequency signal to the processor 911, so that the processor 911 further processes the digital baseband signal or the digital intermediate frequency signal, such as demodulation and decoding. In addition, the transmitter Tx in the transceiver 913 is also used to receive a modulated digital baseband signal or a digital intermediate frequency signal from the processor 911, and convert the modulated digital baseband signal or the digital intermediate frequency signal into a radio frequency signal, and send the radio frequency signal through one or more antennas 915. Specifically, the receiver Rx can selectively perform one or more stages of down-mixing and analog-to-digital conversion processing on the RF signal to obtain a digital baseband signal or a digital intermediate frequency signal, and the order of the down-mixing and analog-to-digital conversion processing is adjustable. The transmitter Tx can selectively perform one or more stages of up-mixing and digital-to-analog conversion processing on the modulated digital baseband signal or digital intermediate frequency signal to obtain a RF signal, and the order of the up-mixing and digital-to-analog conversion processing is adjustable. The digital baseband signal and the digital intermediate frequency signal can be collectively referred to as a digital signal.

[0414] The transceiver 913 may also be referred to as a transceiver unit, a transceiver, a transceiver device, etc. Optionally, a device in the transceiver unit for implementing a receiving function may be regarded as a receiving unit, and a device in the transceiver unit for implementing a sending function may be regarded as a sending unit, that is, the transceiver unit includes a receiving unit and a sending unit, the receiving unit may also be referred to as a receiver, an input port, a receiving circuit, etc., and the sending unit may be referred to as a transmitter, a transmitter, or a transmitting circuit, etc.

[0415] It should be noted that Fig. 9 The communication device 900 shown can be specifically used to implement the steps implemented by the network device in the aforementioned method embodiment, and achieve the corresponding technical effects of the network device. Fig. 9 The specific implementation methods of the communication device 900 shown can all refer to the description in the aforementioned method embodiment, and will not be described in detail here.

[0416] An embodiment of the present application also provides a computer-readable storage medium, which is used to store one or more computer-executable instructions. When the computer-executable instructions are executed by a processor, the processor executes the method described in the possible implementation methods of the terminal device or network device in the above embodiments.

[0417] An embodiment of the present application also provides a computer program product (or computer program). When the computer program product is executed by the processor, the processor executes the method of the possible implementation mode of the above-mentioned terminal device or network device.

[0418] The embodiment of the present application also provides a chip system, which includes at least one processor for supporting a communication device to implement the functions involved in the possible implementation methods of the above-mentioned communication device. Optionally, the chip system also includes an interface circuit, which provides program instructions and / or data for the at least one processor. In one possible design, the chip system may also include a memory, which is used to store the necessary program instructions and data for the communication device. The chip system can be composed of chips, or it can include chips and other discrete devices, wherein the communication device can specifically be a terminal device or a network device in the aforementioned method embodiment.

[0419] An embodiment of the present application also provides a communication system, which includes the terminal device and the network device in any of the above embodiments.

[0420] 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 an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0421] 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.

[0422] 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.

[0423] When the above-mentioned communication device is a chip applied to a terminal, the terminal chip implements the functions of the terminal in the above-mentioned method embodiment. The terminal chip receives information from the base station, which can be understood as the information is first received by other modules in the terminal (such as a radio frequency module or an antenna), and then sent to the terminal chip by these modules. The terminal chip sends information to the base station, which can be understood as the information is first sent to other modules in the terminal (such as a radio frequency module or an antenna), and then sent to the base station by these modules.

[0424] When the above-mentioned communication device is a chip applied to a base station, the base station chip implements the function of the base station in the above-mentioned method embodiment. The base station chip receives information from the terminal, which can be understood as the information is first received by other modules in the base station (such as a radio frequency module or an antenna), and then sent to the base station chip by these modules. The base station chip sends information to the terminal, which can be understood as the information is sent to other modules in the base station (such as a radio frequency module or an antenna), and then sent to the terminal by these modules.

[0425] It is understandable that the processor in the embodiments of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0426] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, register, hard disk, mobile hard disk, CD-ROM or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a base station or a terminal. The processor and the storage medium can also be present in a base station or a terminal as discrete components.

[0427] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed on a computer, the process or function described in the embodiment of the present application is executed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device or other programmable device. The computer program or instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instruction may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server, data center, etc. that integrates one or more available media. The available medium may be a magnetic medium, for example, a floppy disk, a hard disk, a tape; it may also be an optical medium, for example, a digital video disc; it may also be a semiconductor medium, for example, a solid-state hard disk. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0428] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0429] It is understood that the various numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic.

Claims

1. A communication method, characterized in that: include: Determine first information, where the first information is used to determine an identifier of a first centralized unit CU, where the distributed unit DU connected to the first CU includes a first cell, where the first cell is a cell supporting access of an mIAB node integrated with mobile access backhaul; wherein the identifier of the first CU is used to establish data transmission in the topology of the first CU for the mIAB node accessing the first cell; The first information is sent.

2. The method according to claim 1, characterized in that: Before sending the first information, the method further includes: receiving a first message, where the first message is used to indicate that a radio resource control (RRC) connection establishment of a first IAB node is completed; wherein the first message includes indication information for indicating that the first IAB node is an mIAB node; Determining to send the first information is based on the first message.

3. The method according to claim 1, characterized in that: Before sending the first information, the method further includes: Receive second information, where the second information comes from the first CU; wherein the second information satisfies at least one of the following: The second information is used to indicate that the mIAB node is allowed to access the first cell; The second information is used to indicate that the mIAB node is not prohibited from accessing the first cell; The second information is used to instruct sending the first information; Determining to send the first information based on the second information.

4. The method according to any one of claims 1 to 3, characterized in that: The first cell is any cell in the DU that supports access of the mIAB node; or, The first cell is a cell accessed by the mIAB node in the DU.

5. The method according to any one of claims 1 to 4, characterized in that: Before determining the first information, the method further includes: Receiving indication information configured by a network management system and used to indicate an identifier of the first CU or an identifier length of the identifier of the first CU; and / or, Receive indication information from the first CU for indicating the identifier of the first CU or the identifier length of the identifier of the first CU.

6. The method according to any one of claims 1 to 5, characterized in that: The first information is carried in a system broadcast message of the first cell.

7. The method according to claim 1, characterized in that The determining of the first information comprises: The first information is received, wherein the first information is carried in an RRC message.

8. The method according to any one of claims 3 to 7, characterized in that: Before receiving the first information, the method further includes: Sending first indication information, where the first indication information is used to indicate that the system information of the first cell does not include the first information; and / or, The system information of the first cell is broadcasted, wherein the system information of the first cell does not include the first information.

9. The method according to any one of claims 1 to 8, characterized in that: The first information includes at least one of the following: an identifier of the first CU; a length of the identifier of the first CU, wherein the length of the identifier of the first CU is used to determine the identifier of the first CU according to a second identifier, and the second identifier is composed of the identifier of the first CU and the identifier of the first cell; The length of the identifier of the first cell, wherein the length of the identifier of the first cell is used to determine the identifier of the first CU according to the second identifier.

10. A communication method, characterized in that: include: Determine second information, where the second information satisfies at least one of the following: The second information is used to indicate that the mIAB node is allowed to access the serving cell; The second information is used to indicate that the mIAB node is not prohibited from accessing the serving cell; The second information is used to instruct sending the first information; Send the second information, wherein the second information is used to determine the sending of the first information, the first information is carried in the system broadcast message of the service cell, the first information is used to determine the identifier of the first CU, and the DU connected to the first CU includes the service cell.

11. The method according to claim 10, characterized in that The method further comprises: Send indication information used to indicate the identifier of the first CU or the identifier length of the identifier of the first CU.

12. The method according to claim 10 or 11, characterized in that: The first information includes at least one of the following: an identifier of the first CU; a length of the identifier of the first CU, wherein the length of the identifier of the first CU is used to determine the identifier of the first CU according to a second identifier, and the second identifier is composed of the identifier of the first CU and the identifier of the serving cell; The length of the identifier of the serving cell, wherein the length of the identifier of the serving cell is used to determine the identifier of the first CU according to the second identifier.

13. The method according to any one of claims 10 to 12, characterized in that: The determining of the second information comprises: The second information is determined based on at least one of the following: receiving first indication information from the DU, where the first indication information is used to indicate that the system information of the serving cell does not include the first information; receiving second indication information from a core network element, where the second indication information is used to indicate that the authorization of the mIAB node is passed; receiving the second indication information and / or the third indication information from the source CU of the MT in the first IAB node, where the third indication information is used to indicate that the first IAB node is an mIAB node and the first CU is a target CU of the MT in the first IAB node; Determining that the first CU is not an F1-terminating centralized unit F1-terminating CU of the first IAB node; receiving fourth indication information from a third CU, where the fourth indication information is used to indicate that the third CU is an F1-terminating CU of the first IAB node; receiving fifth indication information from the MT in the first IAB node, where the fifth indication information is used to indicate that the first CU is not an F1-terminating CU of the first IAB node; Determining that a DU in the first IAB node is to perform distributed unit migration DU migration; receiving sixth indication information from an MT in the first IAB node or an F1-terminating CU of the first IAB node, where the sixth indication information is used to indicate requesting the first information.

14. The method according to claim 13, characterized in that The second indication information from the core network element is carried by any one of the following: Initial context establishment request INITIAL CONTEXT SETUP REQUEST message, path switch request response PATHSWITCH REQUEST ACK message, user equipment context modification request UE CONTEXT MODIFICATION REQUEST message.

15. A communication method, characterized in that: include: Based on at least one of the following, first information is determined, where the first information is used to determine an identifier of a first CU, where a DU connected to the first CU includes a serving cell of a first integrated access and backhaul IAB node, and where the first IAB node is an mIAB node: receiving first indication information from the DU, where the first indication information is used to indicate that the system information of the serving cell does not include the first information; receiving second indication information from a core network element, where the second indication information is used to indicate that the authorization of the mIAB node is passed; receiving the second indication information and / or the third indication information from the source CU of the MT in the first IAB node, where the third indication information is used to indicate that the first IAB node is an mIAB node and the first CU is a target CU of the MT in the first IAB node; Determining that the first CU is not an F1-terminating centralized unit F1-terminating CU of the first IAB node; receiving fourth indication information from a third CU, where the fourth indication information is used to indicate that the third CU is an F1-terminating CU of the first IAB node; receiving fifth indication information from the MT in the first IAB node, where the fifth indication information is used to indicate that the first CU is not an F1-terminating CU of the first IAB node; Determining that a DU in the first IAB node is to perform distributed unit migration DU migration; receiving sixth indication information from the MT in the first IAB node or the F1-terminating CU of the first IAB node, where the sixth indication information is used to indicate requesting the first information; The first information is sent, where the first information is carried in a radio resource control RRC message.

16. The method according to claim 15, characterized in that The second indication information from the core network element is carried by any one of the following: Initial context establishment request INITIAL CONTEXT SETUP REQUEST message, path switch request response PATHSWITCH REQUEST ACK message, user equipment context modification request UE CONTEXT MODIFICATION REQUEST message.

17. The method according to claim 15 or 16, characterized in that The first information includes at least one of the following: an identifier of the first CU; a length of the identifier of the first CU, wherein the length of the identifier of the first CU is used to determine the identifier of the first CU according to a second identifier, and the second identifier is composed of the identifier of the first CU and the identifier of the serving cell; The length of the identifier of the serving cell, wherein the length of the identifier of the serving cell is used to determine the identifier of the first CU according to the second identifier.

18. A communication device, characterized in that: Comprising means for performing the method as claimed in any one of claims 1 to 17.

19. A communication device, characterized in that: The method comprises at least one processor coupled to a memory; the at least one processor is configured to execute the method according to any one of claims 1 to 17.

20. A readable storage medium, characterized in that: The storage medium stores a computer program or an instruction, and when the computer program or the instruction is executed by the communication device, the method according to any one of claims 1 to 17 is implemented.

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