Communication method and apparatus

Abstract

The application provides a communication method and device, which can solve the problem of duplex constraint when the IAB node is connected to multiple donor nodes or the IAB-DU and the IAB-MT do not belong to the same donor node management, thereby ensuring that the IAB node can normally communicate. The method comprises the following steps: receiving first resource configuration information from a target donor node; determining third resource configuration information according to the first resource configuration information, and sending the third resource configuration information to a first node. The first resource configuration information comprises current resource configuration information of a target cell, the target cell is a cell served by a target parent node, and the target parent node is used for connecting the first node to the target donor node. The third resource configuration information is used for resource configuration of a first cell, and the first cell is a cell served by the first node.

Description

Technical Field

[0001] This application relates to the field of communications, and more particularly to a communication method and apparatus. Background Technology

[0002] An integrated access and backhaul (IAB) node includes a mobile terminal (MT) and a distributed unit (DU). When an IAB node faces its parent node, it can act as an MT. When an IAB node faces its child nodes (which can be terminal devices or the MT portion of another IAB node), it can act as a DU and can be considered a network device. An IAB node can establish a wireless backhaul link with at least one parent node through its MT portion and a wireless access link with at least one child node through its DU portion.

[0003] If the radio access link and radio backhaul link of an IAB node operate in intra-band mode (i.e., the radio access link and radio backhaul link use the same frequency band radio carrier), the DU part (hereinafter referred to as IAB-DU) and the MT part (hereinafter referred to as IAB-MT) of the IAB node suffer from duplex constraints. Specifically, IAB-DU and IAB-MT operate using time division multiplexing (TDM). In downlink transmission, when IAB-MT receives a message from its parent node, the IAB-DU part of that IAB node cannot send messages to its child nodes; conversely, when IAB-DU sends a message to its child nodes, IAB-MT cannot receive messages from its parent node. Similarly, in uplink transmission, IAB-DU and IAB-MT suffer from the same duplex constraints.

[0004] However, existing technologies can only address the duplex constraint problem when an IAB node and its parent node are connected to the same host node. Summary of the Invention

[0005] This application provides a communication method and apparatus that can solve the duplex constraint problem when an IAB node connects to multiple host nodes or when IAB-DU and IAB-MT are not managed by the same host node, thereby ensuring that the IAB node can communicate normally.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] Firstly, a communication method is provided. The communication method includes: receiving one or more of the following from a target host node: first resource configuration information, sixth resource configuration information, or first information; determining third resource configuration information, including: determining the third resource configuration information based on the first resource configuration information, or, based on the sixth resource configuration information and / or the first information; determining the third resource configuration information; and sending the third resource configuration information to a first node.

[0008] The first resource configuration information includes the current resource configuration information of the target cell; the sixth resource configuration information includes the resource reconfiguration information of the target cell; the target cell is the cell served by the target parent node; and the target parent node is used for connection between the first node and the target host node. The first information includes the resource configuration information of the first cell determined by the target host node, and the first cell is the cell served by the first node. The third resource configuration information is used for the resource configuration of the first cell.

[0009] Based on the communication method described in the first aspect, the source host node receives the current resource configuration information of the target cell served by the target node from the target host node, and determines the resource reconfiguration information of the first cell served by the first node based on the current resource configuration information of the target cell. Alternatively, the target host node sends the first information it has determined and / or the resource reconfiguration information of the target cell to the source host node, suggesting that the source host node adjust the resource configuration of the target cell according to the first information and / or the resource reconfiguration information of the target cell. In this way, the duplex constraint can be satisfied, ensuring that IAB nodes can communicate normally, and avoiding the situation where the link between the first node and the target parent node is not sufficiently available in the time domain due to the conflict between the resource configuration of the first cell and the resource configuration of the target cell after the first node accesses the target parent node, thereby improving the availability and capacity of the IAB network.

[0010] In one possible design, determining the third resource configuration information based on the first resource configuration information can include: determining the third resource configuration information based on both the first and second resource configuration information. The second resource configuration information can include the current resource configuration information of the first cell. In other words, the source host node can determine the third resource configuration information based on the current resource configuration information of the target cell and the current resource configuration information of the first cell.

[0011] In one possible design, determining the third resource configuration information based on the sixth resource configuration information and / or the first information may include: determining the third resource configuration information based on the sixth resource configuration information and / or the first information, as well as the second resource configuration information. The second resource configuration information may include the current resource configuration information of the first cell. In other words, the source host node can determine the third resource configuration information based on the resource reconfiguration information of the target cell and / or the resource configuration information of the first cell determined by the target host node, as well as the current resource configuration information of the first cell.

[0012] In one possible design, the communication method described in the first aspect may further include: determining second information based on second resource configuration information. The second resource configuration information may include the current resource configuration information of the first cell, and may also include the resource configuration information of the target cell determined by the source host node. That is, the source host node can determine the resource configuration information of the target cell and send it to the target host node, suggesting that the target host node adjust the resource configuration of the target cell according to the second information to avoid conflicts between the resource configuration of the first cell and the target cell.

[0013] In one possible design, the communication method described in the first aspect may further include: determining second information based on second resource configuration information and first resource configuration information. The second resource configuration information may include the current resource configuration information of the first cell, and the second information may include the resource configuration information of the target cell determined by the source host node.

[0014] In one possible design, the communication method described in the first aspect may further include: sending second information to the target host node.

[0015] In one possible design, the communication method described in the first aspect may further include: determining fifth resource configuration information based on third resource configuration information and / or first resource configuration information. The fifth resource configuration information includes resource reconfiguration information of a second cell, which is a cell served by a second node, and the second node is connected to the source host node via a first node. That is, the source host node can determine the resource reconfiguration information of the second cell served by a subordinate node of the first node based on the resource reconfiguration information of the first cell and / or the current resource configuration information of the target cell.

[0016] In one possible design, the communication method described in the first aspect may further include: determining fifth resource configuration information based on third resource configuration information and / or first resource configuration information, and fourth resource configuration information. The fourth resource configuration information may include the current resource configuration information of the second cell, the second cell being a cell that can be served by the second node, and the second node connecting to the source host node via the first node. The fifth resource configuration information may include resource reconfiguration information of the second cell.

[0017] In one possible design, the communication method described in the first aspect may further include: determining fifth resource configuration information based on one or more of the sixth resource configuration information, the first information, and the third resource configuration information. The fifth resource configuration information may include resource reconfiguration information of a second cell, which is a cell that can be served by a second node, and the second node connects to the source host node via the first node.

[0018] In one possible design, the communication method described in the first aspect may further include: determining fifth resource configuration information based on one or more of the sixth resource configuration information, the first information, and the third resource configuration information, as well as the fourth resource configuration information. The fourth resource configuration information may include the current resource configuration information of the second cell, and the fifth resource configuration information may include resource reconfiguration information of the second cell. The second cell is a cell served by the second node, and the second node connects to the source host node via the first node.

[0019] In one possible design, the communication method described in the first aspect may further include: sending fifth resource configuration information to the second node.

[0020] In one possible design, the communication method described in the first aspect may further include: sending a second activation indication message to the second node. The second activation indication message can be used to indicate that the fifth resource configuration information has taken effect.

[0021] In one possible design, the communication method described in the first aspect may further include: sending third resource configuration information to the target host node.

[0022] In one possible design, the communication method described in the first aspect may further include: sending a first request message to the target host node. The first request message may be used to request a switch of the first node's host node from the source host node to the target host node, or to request the target host node to be used as a secondary station of the first node.

[0023] In one possible design, the first request message may include one or more of the following: first indication information, the identifier of the target cell, or second resource configuration information. The first indication information can be used to indicate that the first node is an integrated access backhaul (IAB) node, and the second resource configuration information may include the current resource configuration information of the first cell.

[0024] In one possible design, the communication method described in the first aspect may further include: receiving a first response message from a target host node. The first response message may be used to confirm switching the host node of the first node from the source host node to the target host node, or to confirm that the target host node is used as a secondary station of the first node.

[0025] In one possible design, the first response message may include one or more of the following: first resource configuration information, sixth resource configuration information, or first information.

[0026] In one possible design, the communication method described in the first aspect may further include: sending second indication information to the target host node. The second indication information can be used to instruct the source host node whether to use the first information as resource reconfiguration information for the first cell. For example, if the second indication information is yes, it indicates that the source host node fully accepts the target host node's suggestion. If the second indication information is no, it indicates that the source host node has not fully accepted the target host node's suggestion or that the source host node does not accept the target host node's suggestion at all.

[0027] In one possible design, the communication method described in the first aspect may further include: receiving third indication information from the target host node. The third indication information can be used to instruct the target host node whether to use the second information as resource reconfiguration information for the target cell. Thus, after receiving the third resource configuration information, the first node does not immediately use the third resource configuration information; instead, after determining that it is effective, it performs resource configuration on the first cell according to the third resource configuration information.

[0028] In one possible design, the communication method described in the first aspect may further include: sending a first activation indication message to the first node. The first activation indication message is used to indicate that the third resource configuration information has taken effect.

[0029] Secondly, a communication method is provided. This communication method includes: receiving one or more of the following from a source host node: second resource configuration information, third resource configuration information, or second information; determining sixth resource configuration information, including: determining the sixth resource configuration information based on the second resource configuration information; or, determining the sixth resource configuration information based on the third resource configuration information and / or the second information; and sending the sixth resource configuration information to a target parent node.

[0030] The second resource configuration information includes the current resource configuration information of the first cell; the third resource configuration information includes the resource reconfiguration information of the first cell; the first cell is a cell served by the first node; the second information includes the resource configuration information of the target cell determined by the source host node; the target cell is a cell served by the target parent node; the target parent node is used for the connection between the first node and the target host node; and the sixth resource configuration information is used for the resource configuration of the target cell.

[0031] Based on the communication method described in the second aspect, the target host node receives the current resource configuration information of the first cell served by the first node from the source host node, and determines the resource reconfiguration information of the target cell served by the target parent node according to the current resource configuration information of the first cell. This can satisfy the duplex constraint, ensure that IAB nodes can communicate normally, and avoid the situation where the link between the first node and the target parent node is not available due to the conflict between the resource configuration of the first cell and the resource configuration of the target cell after the first node accesses the target parent node. This can improve the availability and capacity of the IAB network.

[0032] In one possible design, determining the sixth resource configuration information based on the second resource configuration information may include: determining the sixth resource configuration information based on the second resource configuration information and the first resource configuration information. The first resource configuration information may include the current resource configuration information of the target cell.

[0033] In one possible design, determining the sixth resource configuration information based on the third resource configuration information and / or the second information may include: determining the sixth resource configuration information based on the third resource configuration information and / or the second information, as well as the first resource configuration information. The first resource configuration information may include the current resource configuration information of the target cell.

[0034] In one possible design, the communication method described in the second aspect may further include: determining first information based on first resource configuration information. The first resource configuration information may include the current resource configuration information of the target cell, and the first information may include the resource configuration information of the first cell determined by the target host node.

[0035] In one possible design, the communication method described in the second aspect may further include: determining first information based on first resource configuration information and second resource configuration information. The first resource configuration information may include the current resource configuration information of the target cell, and the first information may include the resource configuration information of the first cell determined by the target host node.

[0036] In one possible design, the communication method described in the second aspect may further include: sending first information to the source host node.

[0037] In one possible design, the communication method described in the second aspect may further include: determining eighth resource configuration information based on the second resource configuration information and / or the sixth resource configuration information. The eighth resource configuration information may include resource reconfiguration information of a third cell, which can be a cell serving a third node, and the third node connects to the target host node via a target parent node.

[0038] In one possible design, the communication method described in the second aspect may further include: determining eighth resource configuration information based on the second resource configuration information and / or the sixth resource configuration information, as well as the seventh resource configuration information. The seventh resource configuration information may include the current resource configuration information of the third cell, where the third cell is a cell served by the third node, and the third node is connected to the target host node via the target parent node. The eighth resource configuration information may include resource reconfiguration information of the third cell.

[0039] In one possible design, the communication method described in the second aspect may further include: determining eighth resource configuration information based on one or more of the third resource configuration information, the second information, and the sixth resource configuration information. The eighth resource configuration information may include resource reconfiguration information of a third cell, which can be a cell serving a third node, and the third node connects to the target host node via a target parent node.

[0040] In one possible design, the communication method described in the second aspect may further include: determining eighth resource configuration information based on one or more of the third resource configuration information, the second information, and the sixth resource configuration information, as well as the seventh resource configuration information. The seventh resource configuration information may include the current resource configuration information of the third cell, and the eighth resource configuration information may include resource reconfiguration information of the third cell. The third cell can be a cell served by the third node, and the third node connects to the target host node via the target parent node.

[0041] In one possible design, the communication method described in the second aspect may further include: sending eighth resource configuration information to the third node.

[0042] In one possible design, the communication method described in the second aspect may further include: sending sixth resource configuration information to the source host node.

[0043] In one possible design, the communication method described in the second aspect may further include: receiving a first request message from a source host node. The first request message may be used to request a switch of the first node's host node from the source host node to the target host node, or to request the target host node to be used as a secondary station of the first node.

[0044] In one possible design, the first request message may include one or more of the following: first indication information, the identifier of the target cell, or second resource configuration information. The first indication information may be used to indicate that the first node is an integrated access backhaul (IAB) node, and the second resource configuration information may include the current resource configuration information of the first cell.

[0045] In one possible design, the communication method described in the second aspect may further include: sending a first response message to the source host node. The first response message may be used to confirm switching the host node of the first node from the source host node to the target host node, or to confirm that the target host node is used as a secondary station of the first node.

[0046] In one possible design, the first response message may include one or more of the following: first resource configuration information, sixth resource configuration information, or first information.

[0047] In one possible design, the communication method described in the second aspect may further include: receiving second indication information from the source host node. The second indication information can be used to indicate whether the source host node should use the first information as resource reconfiguration information for the first cell.

[0048] In one possible design, the communication method described in the second aspect may further include: sending third indication information to the source host node. The third indication information can be used to instruct the target host node whether to use the second information as resource reconfiguration information for the target cell.

[0049] In one possible design, the communication method described in the second aspect may further include: sending a first activation indication message to the first node. The first activation indication message can be used to indicate that the third resource configuration information has taken effect.

[0050] In one possible design, the communication method described in the second aspect may further include: sending a third activation indication message to a third node. The third activation indication message can be used to indicate that the eighth resource configuration information has taken effect.

[0051] In one possible design, the communication method described in the second aspect may further include: sending a fourth activation indication message to the target parent node. The fourth activation indication message can be used to indicate that the sixth resource configuration information has taken effect.

[0052] Thirdly, a communication method is provided. This communication method includes: receiving third resource configuration information from a source host node; determining that the third resource configuration information is effective, including: receiving first effectiveness indication information from a target host node, a target parent node, or a source host node, or establishing a connection with the target parent node; and configuring resources for a first cell based on the third resource configuration information. Wherein, the third resource configuration information is used for resource configuration of the first cell, the first cell is a cell served by a first node, and the first effectiveness indication information is used to indicate that the third resource configuration information is effective.

[0053] In one possible design, the communication method described in the third aspect may further include: sending a second activation indication message to the second node. The second activation indication message can be used to indicate that the fifth resource configuration information has taken effect. Thus, after receiving the fifth resource configuration information, the second node does not immediately use the fifth resource configuration information; instead, after confirming its effectiveness, it configures the resources of the second cell according to the fifth resource configuration information.

[0054] Furthermore, the technical effects of the third aspect can be referenced from the technical effects of the communication method described in any of the implementation methods in the second aspect, and will not be elaborated here.

[0055] Fourthly, a communication method is provided. This communication method includes: receiving sixth resource configuration information from a target host node; determining that the sixth resource configuration information is effective, including: receiving fourth effectiveness indication information from the target host node, or establishing a connection with a first node; and configuring resources for a target cell based on the sixth resource configuration information. The sixth resource configuration information can be used for resource configuration of the target cell, the target cell is a cell served by a target parent node, the target parent node can be used by the first node to connect with the target host node, and the fourth effectiveness indication information is used to indicate that the sixth resource configuration information is effective.

[0056] In one possible design, the communication method described in the fourth aspect may further include: sending a third activation indication message to a third node. The third activation indication message can be used to indicate that the eighth resource configuration information has taken effect.

[0057] In one possible design, the communication method described in the fourth aspect may further include: sending a first effective indication message to the first node; wherein the first effective indication message can be used to indicate that the third resource configuration information is effective.

[0058] Furthermore, the technical effects of the fourth aspect can be referenced from the technical effects of the communication method described in any of the implementation methods in the second aspect, and will not be elaborated here.

[0059] Fifthly, a communication method is provided. This communication method includes: sending first configuration activation information to a second node. The first configuration activation information is used to indicate the activation of a first Internet Protocol (IP) address and / or the activation of first Backhaul Adaptation Protocol (BAP) layer configuration information. The first IP address is used by the second node to communicate with the centralized unit (CU) of the source host node or the CU of the target host node through the distributed unit (DU) of the target host node. The first BAP layer configuration information is used by the second node to communicate with the CU of the source host node or the CU of the target host node.

[0060] Based on the communication method described in the fifth aspect, after obtaining the first IP address and / or the first BAP layer configuration information, the second node may not use the configuration initially. After receiving the first configuration activation information, it may use the first IP address and / or the first BAP layer configuration information to communicate with the CU of the source host node or the CU of the target host node. Thus, when the first node is connected to multiple host nodes, or when the DU part and the MT part of the first node are not managed by the same host node, the second node can communicate normally with the CU of the source host node or the CU of the target host node.

[0061] In one possible design, the first BAP layer configuration information may include one or more of the following: a first BAP route identifier, the BAP address of the next-hop node of the second node, the identifier of the default backhaul BH Radio Link Control (RLC) channel on the first link, the identifier of the BH RLC channel on the first link corresponding to one or more F1 interface user plane tunnels, the identifier of the BH RLC channel on the first link corresponding to F1AP messages related to the terminal device (UE), the identifier of the BH RLC channel on the first link corresponding to non-UE related F1AP messages, or the identifier of the BH RLC channel on the first link corresponding to non-F1 interface non-F1 services. Wherein, the next-hop node of the second node is the next-hop node of the second node in uplink transmission, i.e., the parent node of the second node. Wherein, the first link is the link between the second node and its next-hop node.

[0062] In one possible design, the first configuration activation information can be carried in the Protocol Data Unit (PDU) of the BAP layer or the Data Link Layer Control Unit (MAC CE).

[0063] In one possible design, the first configuration activation information may include a first index value and / or a second index value, wherein the first index value is used to indicate at least one first IP address and the second index value is used to indicate at least one first BAP layer configuration information.

[0064] In one possible design, the first configuration activation information may include the identifier of the target host node.

[0065] Sixthly, a communication method is provided. The communication method includes: receiving first configuration activation information from a first node. The first configuration activation information is used to indicate the activation of a first Internet Protocol (IP) address and / or the activation of first Backhaul Adaptation Protocol (BAP) layer configuration information. The first IP address is used by a second node to communicate with the centralized unit (CU) of the source host node or the CU of the target host node through the distributed unit (DU) of the target host node. The first BAP layer configuration information is used by the second node to communicate with the CU of the source host node or the CU of the target host node.

[0066] Furthermore, the technical effects of the sixth aspect can be referenced from the technical effects of the communication method described in any of the implementation methods in the fifth aspect, and will not be repeated here.

[0067] In one possible design, the first BAP layer configuration information may include one or more of the following: a first BAP route identifier, the BAP address of the next-hop node of the second node, the identifier of the default backhaul BH Radio Link Control (RLC) channel on the first link, the identifier of the BH RLC channel on the first link corresponding to one or more F1 interface user plane tunnels, the identifier of the BH RLC channel on the first link corresponding to F1AP messages related to the terminal device (UE), the identifier of the BH RLC channel on the first link corresponding to non-UE related F1AP messages, or the identifier of the BH RLC channel on the first link corresponding to non-F1 interface non-F1 services. Wherein, the next-hop node of the second node is the next-hop node of the second node in uplink transmission, i.e., the parent node of the second node. Wherein, the first link is the link between the second node and its next-hop node.

[0068] In one possible design, the first configuration activation information can be carried in the Protocol Data Unit (PDU) of the BAP layer or the Data Link Layer Control Unit (MAC CE).

[0069] In one possible design, the first configuration activation information may include a first index value and / or a second index value, wherein the first index value is used to indicate at least one first IP address and the second index value is used to indicate at least one first BAP layer configuration information.

[0070] In one possible design, the first configuration activation information may include the identifier of the target host node.

[0071] In a seventh aspect, a communication method is provided. The communication method includes: determining that a first condition is met, and sending a first message to a second node.

[0072] The first condition includes: receiving a release message or a handover success message from the target host node; or receiving an indication from the target host node that the mobile terminal (MT) portion of the first node has successfully connected to the target host node; or determining that the control plane of the F1 interface of the first node has switched to the second Internet Protocol (IP) address. The release message instructs the source host node to release the MT portion of the first node, the handover success message indicates that the MT portion of the first node has successfully switched from connecting to the source host node to connecting to the target host node, and the second IP address is used for the first node to communicate with the centralized unit (CU) of the source host node through the target host node's duplex (DU). The first message includes a first IP address and / or first backhaul adaptation protocol (BAP) layer configuration information. The first IP address is used for the second node to communicate with the CU of the source host node or the CU of the target host node through the target host node's DU, and the first BAP layer configuration information is used for the second node to communicate with the CU of the source host node or the CU of the target host node.

[0073] Based on the communication method described in the seventh aspect, after the source host node determines that the MT part of the first node has successfully connected to the target host node, it sends the first IP address and / or the first BAP layer configuration information to the second node, so that the second node can communicate with the CU of the source host node or the CU of the target host node using the first IP address and / or the first BAP layer configuration information. Thus, when the first node is connected to multiple host nodes, or when the DU part and the MT part of the first node are not managed by the same host node, the second node can communicate normally with the CU of the source host node or the CU of the target host node.

[0074] In one possible design, the first BAP layer configuration information may include one or more of the following: a first BAP route identifier, the BAP address of the next-hop node of the second node, the identifier of the default backhaul BH Radio Link Control (RLC) channel on the first link, the identifier of the BH RLC channel on the first link corresponding to one or more F1 interface user plane tunnels, the identifier of the BH RLC channel on the first link corresponding to F1AP messages related to the terminal device (UE), the identifier of the BH RLC channel on the first link corresponding to non-UE related F1AP messages, or the identifier of the BH RLC channel on the first link corresponding to non-F1 interface non-F1 services. Wherein, the next-hop node of the second node is the next-hop node of the second node in uplink transmission, i.e., the parent node of the second node. Wherein, the first link is the link between the second node and its next-hop node.

[0075] Eighthly, a communication method is provided. This communication method includes: receiving a first Internet Protocol (IP) address and / or first Backhaul Adaptor (BAP) layer configuration information from a source host node; receiving a first transmission instruction from the source host node; and, after a first node successfully establishes a connection with a target parent node, sending the first IP address and / or the first BAP layer configuration information to a second node. The first IP address is used by the second node to communicate with the centralized unit (CU) of the source host node or the CU of the target host node through the distributed unit (DU) of the target host node; the first BAP layer configuration information is used by the second node to communicate with the CU of the source host node or the CU of the target host node; and the first transmission instruction is used to instruct the first node to send the first IP address and / or the first BAP layer configuration information to the second node after successfully establishing a connection with the target parent node.

[0076] Based on the communication method described in the eighth aspect, after successfully establishing a connection with the target parent node, the first node sends a first IP address and / or first BAP layer configuration information to the second node according to the instructions of the source host node, so that the second node can communicate with the CU of the source host node or the CU of the target host node using the first IP address and / or the first BAP layer configuration information. Thus, when the first node is connected to multiple host nodes, or when the DU part and the MT part of the first node are not managed by the same host node, the second node can communicate normally with the CU of the source host node or the CU of the target host node.

[0077] In one possible design, the first BAP layer configuration information includes one or more of the following: a first BAP route identifier, the BAP address of the next-hop node of the second node, the identifier of the default backhaul BH Radio Link Control (RLC) channel on the first link, the identifier of the BH RLC channel on the first link corresponding to one or more F1 interface user plane tunnels, the identifier of the BH RLC channel on the first link corresponding to F1AP messages related to the terminal device (UE), the identifier of the BH RLC channel on the first link corresponding to non-UE related F1AP messages, or the identifier of the BH RLC channel on the first link corresponding to non-F1 interface non-F1 services. Wherein, the next-hop node of the second node is the next-hop node of the second node in uplink transmission, i.e., the parent node of the second node. Wherein, the first link is the link between the second node and its next-hop node.

[0078] A ninth aspect provides a communication device. The communication device includes units or modules for performing the methods of any one of the first or eleventh aspects.

[0079] In this application, the communication device described in the ninth aspect can be a source host node, or a chip (system) or other component or assembly that can be disposed on the source host node.

[0080] Furthermore, the technical effects of the communication device described in the ninth aspect can be referenced from the technical effects of the communication method described in any of the implementations of the first aspect or the eleventh aspect, and will not be repeated here.

[0081] A tenth aspect provides a communication device. The communication device includes a unit or module for performing any of the methods in the second aspect.

[0082] In this application, the communication device described in the tenth aspect can be a target host node, or a chip (system) or other component or assembly that can be disposed on the target host node.

[0083] Furthermore, the technical effects of the communication device described in the tenth aspect can be referred to the technical effects of the communication method described in any implementation of the second aspect, and will not be repeated here.

[0084] Eleventhly, a communication device is provided. The communication device includes units or modules for performing the methods of any one of the third, fifth, or eighth aspects.

[0085] In this application, the communication device described in the eleventh aspect can be a first node, or a chip (system) or other component or assembly that can be disposed on the first node.

[0086] Furthermore, the technical effects of the communication device described in the eleventh aspect can be referenced from the technical effects of the communication method described in any of the third, fifth, or eighth aspects, and will not be repeated here.

[0087] In a twelfth aspect, a communication device is provided. The communication device includes a unit or module for performing any of the methods in the fourth aspect.

[0088] In this application, the communication device described in aspect 82 can be a target parent node, or a chip (system) or other component or assembly that can be disposed on the target parent node.

[0089] Furthermore, the technical effects of the communication device described in the twelfth aspect can be referenced from the technical effects of the communication method described in any implementation of the fourth aspect, and will not be repeated here.

[0090] In a thirteenth aspect, a communication device is provided. The communication device includes a unit or module for performing any of the methods in the sixth aspect.

[0091] In this application, the communication device described in aspect thirteen can be a second node, or a chip (system) or other component or assembly that can be disposed on the second node.

[0092] Furthermore, the technical effects of the communication device described in aspect thirteen can be referenced from the technical effects of the communication method described in any implementation of aspect six, and will not be repeated here.

[0093] Fourteenth aspect: A communication device is provided, comprising: a processor coupled to a memory; the memory for storing a computer program; and the processor for executing the computer program stored in the memory, such that the communication device performs a communication method as described in any one of the first to eighth aspects.

[0094] In one possible design, the communication device described in aspect fourteen may further include a transceiver. The transceiver may be a transceiver circuit or an input / output port. The transceiver can be used for communication between the communication device and other communication devices.

[0095] In this application, the communication device described in the fourteenth aspect may be a source host node, a target host node, a first node, a target parent node, or a second node, or a chip or chip system disposed inside the source host node, the target host node, the first node, the target parent node, or the second node.

[0096] Furthermore, the technical effects of the communication device described in the fourteenth aspect can be referenced to the technical effects of the communication method described in any of the implementations of the first to eighth aspects, and will not be repeated here.

[0097] In a fifteenth aspect, a chip system is provided, the chip system including a processor and an input / output port, the processor being configured to implement the processing functions involved in any one of the first to eighth aspects, and the input / output port being configured to implement the transceiver functions involved in any one of the first to eighth aspects.

[0098] In one possible design, the chip system also includes a memory for storing program instructions and data for implementing the functions involved in any of the first to eighth aspects.

[0099] This chip system can consist of chips or include chips and other discrete components.

[0100] In a sixteenth aspect, a communication system is provided. The system may include a source host node and a first node, a target host node, or the system may include a target host node and a target parent node, a source host node, or the system may include a source host node and one or more second nodes, or the system may include a first node and one or more second nodes, or the system may include a source host node, a first node, a target host node and a target parent node, or the system may include a source host node, a first node, a target host node, a target parent node and a second node.

[0101] In a seventeenth aspect, a computer-readable storage medium is provided, the computer-readable storage medium including a computer program or instructions that, when executed on a computer, cause the computer to perform a communication method as described in any of the possible implementations of the first to eighth aspects.

[0102] Eighteenth aspect, a computer program product is provided, the computer program product comprising: a computer program or instructions that, when executed on a computer, cause the computer to perform the communication method as described in any of the possible implementations of the first to eighth aspects. Attached Figure Description

[0103] Figure 1 This application provides a schematic diagram of an IAB networking scenario.

[0104] Figure 2 This is a schematic diagram of another IAB networking scenario provided in an embodiment of this application;

[0105] Figure 3 This is a schematic diagram of the architecture of the communication system according to an embodiment of this application;

[0106] Figure 4 A schematic diagram illustrating a cross-host switching scenario provided in an embodiment of this application;

[0107] Figure 5 This is a schematic diagram of a cross-host dual-connection scenario provided in an embodiment of this application;

[0108] Figure 6 This is a schematic diagram of the structure of an IAB node provided in an embodiment of this application;

[0109] Figure 7 A schematic diagram of a protocol stack architecture provided for an embodiment of this application;

[0110] Figure 8 A flowchart illustrating a communication method provided in an embodiment of this application;

[0111] Figure 9 This is a schematic diagram illustrating the application of a communication method provided in an embodiment of this application;

[0112] Figure 10 This is a schematic diagram illustrating the application of another communication method provided in the embodiments of this application;

[0113] Figure 11 A flowchart illustrating another communication method provided in an embodiment of this application;

[0114] Figure 12 A flowchart illustrating yet another communication method provided in an embodiment of this application;

[0115] Figure 13 A flowchart illustrating yet another communication method provided in an embodiment of this application;

[0116] Figure 14 A flowchart illustrating yet another communication method provided in an embodiment of this application;

[0117] Figures 15 to 19 These are schematic diagrams of a communication device provided in the embodiments of this application. Detailed Implementation

[0118] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. In the description of this application, unless otherwise stated, " / " indicates "or," for example, A / B can mean A or B. "And / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. Additionally, to facilitate a clear description of the technical solutions of the embodiments of this application, the terms "first," "second," etc., are used in the embodiments of this application to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first," "second," etc., do not limit the quantity or execution order, and that "first," "second," etc., do not necessarily imply differences.

[0119] This application will present various aspects, embodiments, or features relating to systems that may include multiple devices, components, modules, etc. It should be understood and appreciated that individual systems may include additional devices, components, modules, etc., and / or may not include all the devices, components, modules, etc. discussed in conjunction with the accompanying drawings. Furthermore, combinations of these approaches are also possible.

[0120] Furthermore, in the embodiments of this application, words such as "exemplarily" and "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as an "example" in this application should not be construed as being better or more advantageous than other embodiments or designs. Rather, the use of the word "example" is intended to present the concept in a specific manner.

[0121] In the embodiments of this application, the terms "information," "signal," "message," "channel," and "singaling" may sometimes be used interchangeably. It should be noted that, without emphasizing their distinction, they all convey the same meaning. Similarly, the terms "of," "corresponding (relevant)," and "corresponding" may sometimes be used interchangeably. It should be noted that, without emphasizing their distinction, they all convey the same meaning.

[0122] The technical solutions of this application can be applied to various communication systems, such as Orthogonal Frequency-Division Multiple Access (OFDMA), Single Carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The term "system" can be used interchangeably with "network." OFDMA systems can implement wireless technologies such as Evolved Universal Terrestrial Radio Access (E-UTRA) and Ultramobile Broadband (UMB). E-UTRA is an evolution of the Universal Mobile Telecommunications System (UMTS). The 3rd Generation Partnership Project (3GPP) uses a new version of E-UTRA in Long Term Evolution (LTE) and various versions based on LTE evolution. The 5th-generation (5G) communication system, using New Radio (NR), is a next-generation communication system currently under research. Furthermore, the technical solutions of this application embodiment can also be applied to future-oriented communication systems, such as sixth-generation (6G) mobile communication systems.

[0123] The network elements involved in this application include terminals and wireless backhaul nodes.

[0124] The terminal in this application embodiment can also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user device. The terminal can also be a station (ST) in a wireless local area network (WLAN), which can be a cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA) device, handheld device with wireless communication capabilities, computing device, or other processing device connected to a wireless modem, vehicle-mounted device, or wearable device (also referred to as wearable smart device). The terminal can also be a terminal in a next-generation communication system, such as a terminal in 5G or a terminal in a future evolved public land mobile network (PLMN).

[0125] A wireless backhaul node is used to provide wireless backhaul services to nodes (e.g., terminals) that wirelessly access the wireless backhaul node. Wireless backhaul services refer to data and / or signaling backhaul services provided through a wireless backhaul link.

[0126] The system architecture and business scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. Those skilled in the art will understand that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems. The embodiments of this application use the application of the provided method in an NR system or a 5G network as an example for illustration. However, it should be noted that the method provided in the embodiments of this application can also be applied to other networks, such as evolved packet system (EPS) networks (i.e., commonly referred to as fourth-generation (4G) networks). Accordingly, when the method provided in the embodiments of this application is applied to an EPS network, the network node executing the method provided in the embodiments of this application can be replaced with a network node in the EPS network. For example, when the method provided in the embodiments of this application is applied to a 5G network or an NR system, the wireless backhaul node mentioned below can be a wireless backhaul node in a 5G network. For example, a wireless backhaul node in a 5G network can be called an IAB node, and of course, it can have other names; the embodiments of this application do not specifically limit this. When the method provided in the embodiments of this application is applied in an EPS network, the wireless backhaul node mentioned below can be a wireless backhaul node in the EPS network. For example, a wireless backhaul node in an EPS network can be called a relay node (RN).

[0127] With the development of technologies such as virtual reality (VR), augmented reality (AR), and the Internet of Things (IoT), there will be an increasing number of terminals in the future network, and the usage of network data will continue to rise. To accommodate the increasing number of terminals and the rapidly growing network data usage, higher demands are being placed on the capacity of 5G networks. In hotspot areas, the use of high-frequency small cell networks is becoming increasingly popular to meet the ultra-high capacity requirements of 5G. High-frequency carriers have poor propagation characteristics, suffer severe attenuation due to obstruction, and have limited coverage; therefore, a large number of small cells need to be densely deployed in hotspot areas. These small cells can serve as integrated access and backhaul (IAB) nodes.

[0128] To design flexible and convenient access and backhaul solutions, both the access link (AL) and backhaul link (BL) in the IAB scenario adopt wireless transmission schemes.

[0129] In a network containing IAB nodes (hereinafter referred to as an IAB network), the IAB nodes can provide wireless access services to terminals and connect to the host node (donor node) via a wireless backhaul link to transmit user service data. For example, the host node can be a host base station. In a 5G network, the host node can be simply referred to as an IAB donor or DgNB (i.e., donor gNodeB). The host node can be a complete entity, or it can be a separate entity consisting of a centralized unit (CU) (hereinafter referred to as Donor-CU, or simply CU) and a distributed unit (DU) (hereinafter referred to as Donor-DU), i.e., the host node consists of Donor-CU and Donor-DU. In this application, the embodiments and accompanying drawings use the example of a host node consisting of Donor-CU and Donor-DU to illustrate the method provided in this application.

[0130] In this context, the Donor-CU can also be a form in which the User plane (UP) (hereinafter referred to as CU-UP) and the Control plane (CP) (hereinafter referred to as CU-CP) are separated, that is, the Donor-CU includes one CU-CP and at least one CU-UP.

[0131] IAB nodes connect to the core network via a wired link through the host node. For example, in a standalone 5G architecture, IAB nodes connect to the 5G network core (5G core, 5GC) via a wired link through the host node. In a non-standalone 5G architecture, IAB nodes connect to the evolved packet core (EPC) via an evolved NodeB (eNB) on the control plane, and to the EPC via the host node and eNB on the user plane.

[0132] To ensure the reliability of service transmission, the IAB network supports multi-hop IAB nodes and multi-connection IAB node networking. Therefore, multiple transmission paths may exist between the terminal and the host node. On a single path, there is a defined hierarchical relationship between IAB nodes, and between IAB nodes and the host nodes serving them. Each IAB node considers the node providing backhaul services to it as its parent node. Correspondingly, each IAB node can be considered a child node of its parent node.

[0133] Figure 1 This is a schematic diagram of an IAB networking scenario provided as an embodiment of this application. Combined with... Figure 1The IAB network supports standalone (SA) networking. In this network, the parent node of IAB node 1 is the host node, which in turn is the parent node of IAB nodes 2 and 3. IAB nodes 2 and 3 are both parent nodes of IAB node 4, and IAB node 5 is the parent node of IAB node 2. Uplink data packets from the terminal can be transmitted to the host node via one or more IAB nodes, and then sent by the host node to the mobile gateway device (e.g., a user plane function (UPF) element in a 5G network). Downlink data packets are received by the host node from the mobile gateway device and then sent to the terminal via one or more IAB nodes. There are two available paths for data packet transmission between terminal 1 and the host node: Terminal 1 → IAB node 4 → IAB node 3 → IAB node 1 → Host node, and Terminal 1 → IAB node 4 → IAB node 2 → IAB node 1 → Host node. There are three available paths for data packet transmission between Terminal 2 and the host node: Terminal 2 → IAB Node 4 → IAB Node 3 → IAB Node 1 → Host Node, Terminal 2 → IAB Node 4 → IAB Node 2 → IAB Node 1 → Host Node, and Terminal 2 → IAB Node 5 → IAB Node 2 → IAB Node 1 → Host Node.

[0134] Understandably, in an IAB network, a transmission path between a terminal and a host node can contain one or more IAB nodes. Each IAB node needs to maintain a radio backhaul link to its parent node and a radio access link to its child nodes. If an IAB node is the node to which a terminal accesses, the link between that IAB node and its child nodes (i.e., the terminal) is a radio access link. If an IAB node is the node that provides backhaul services to other IAB nodes, the link between that IAB node and its child nodes (i.e., the other IAB nodes) is a radio backhaul link. See, for an example... Figure 1 In the path “Terminal 1 → IAB Node 4 → IAB Node 3 → IAB Node 1 → Host Node”, Terminal 1 accesses IAB Node 4 via a wireless access link, IAB Node 4 accesses IAB Node 3 via a wireless backhaul link, IAB Node 3 accesses IAB Node 1 via a wireless backhaul link, and IAB Node 1 accesses the host node via a wireless backhaul link.

[0135] For example, the IAB node can be a customer premises equipment (CPE), a residential gateway (RG), or other similar devices. In this case, the method provided in this application embodiment can also be applied to home access scenarios.

[0136] The above Figure 1 The IAB networking scenario shown is merely an example. In IAB scenarios that combine multi-hop and multi-connection, there are many other possibilities for IAB networking, such as a host node and an IAB node under another host node forming a dual connection to provide terminal services, etc., which will not be listed here.

[0137] Figure 2 This is a schematic diagram of another IAB networking scenario provided in an embodiment of this application. Combined with... Figure 2 IAB networks can support non-standalone networks.

[0138] (Non-standalone, NSA) networking. IAB nodes support dual connectivity for 4G and 5G networks, i.e., E-UTRAN-NR dual connectivity (EN-DC). The evolved NodeB (eNB) is the master eNB (MeNB), providing LTE air interface (LTE Uu) connectivity to the IAB nodes and establishing an S1 interface with the EPC for user plane and control plane transmission. The IAB host is the secondary base station, providing NR air interface (NR Uu) connectivity to the IAB nodes and establishing an S1 interface with the EPC for user plane transmission. Similarly, the terminal supports EN-DC, connecting to the master eNB via the LTE Uu interface and to the secondary IAB node via the NR Uu interface. The UE's secondary base station can also be the IAB host.

[0139] It should be noted that, Figure 2 The IAB networking scenario shown is merely an example; the NSA networking scenario of an IAB network can support multi-hop IAB networking. For example, Figure 2 The terminal in the process can be another IAB node, meaning that the IAB node can connect to the IAB host through a multi-hop wireless backhaul link. These will not be listed one by one here.

[0140] To facilitate understanding of the embodiments of this application, let's first take... Figure 3 The communication system illustrated herein is used as an example to illustrate a communication system applicable to embodiments of this application. For example, Figure 3 This is a schematic diagram of the architecture of a communication system to which the communication method provided in the embodiments of this application is applicable.

[0141] like Figure 3 As shown, the communication system includes a source host node, a target host node, a source parent node, a target parent node, and a first node. Optionally, the system may also include at least one second node and at least one terminal device, and may also include at least one subordinate node of a third node and at least one subordinate terminal device of the third node; this application does not impose any limitations.

[0142] in, Figure 3 The communication system shown can include cross-host switching scenarios and cross-host dual-connection scenarios. In the cross-host switching scenario, before the switch, the first node connects to the source host node through the source parent node; after the switch, the first node connects to the target host node through the target parent node. In the cross-host dual-connection scenario, the first node first establishes a connection with the source parent node, the source parent node connects to the source host node, and then establishes a connection with the target parent node by adding a secondary node; the target parent node connects to the target host node.

[0143] It should be noted that the communication method provided in the embodiments of this application can be applied to... Figure 3 For any two nodes shown, the specific implementation can be found in the following method embodiments, which will not be repeated here.

[0144] It should be understood that Figure 3 This is a simplified diagram for illustrative purposes only. The communication system may also include other IAB nodes and / or other terminal devices. Figure 3 It was not drawn in the middle.

[0145] The following are combined with Figure 4 and Figure 5 The scenario shown illustrates in detail the problems existing in the current technology.

[0146] Figure 4 This is a schematic diagram of a cross-host switching scenario provided in an embodiment of this application.

[0147] Combination Figure 4 The node undergoing the handover is designated as the first node, which can provide access and backhaul services to one or more UEs / subnodes. For example, Figure 4 The diagram shows UE1 accessing the cell served by the first node, and the second node. Similarly, the second node can provide access and backhaul services for one or more UEs / sub-nodes, for example, Figure 4 The image shows UE2 accessing the cell served by the second node. In actual network deployment scenarios, the first node may have one or more grandchild nodes (IAB nodes connected to the first node via at least two hops of radio backhaul links), and the second node may provide services to more UEs, or child nodes or grandchild nodes. This application does not impose any restrictions on this.

[0148] For ease of description, this application refers to these IAB nodes or UEs connected to the host node via the first node as the descendant IAB node or descendant UE of the first node, and the descendant IAB node and the descendant UE are collectively referred to as descendant nodes.

[0149] After the first node connects to the target parent node from the source parent node after performing a handover, its subordinate second node, as well as UE1 and UE2, can also follow the first node to perform a handover.

[0150] Combination Figure 4 During the cross-host node switchover process performed by the first node, the execution order in which the first node and its subordinate nodes switch to the target host node can be varied. For example, the switchover can be performed from top to bottom, from bottom to top, or in any order. Consequently, during the migration of the first node and its subordinate nodes, it is possible for the MT and DU portions of an IAB node to connect to two different IAB host nodes, respectively.

[0151] Figure 4 Two execution sequences are illustrated. In the first switching sequence, during the initial transition, neither the first node nor its subordinate nodes perform a switch; both are connected to the CU of the source host node through the source parent node. In intermediate state 1, the MT1 portion of the first node switches from connecting to the source parent node to connecting to the target parent node, connecting to the CU of the target host node through the target parent node. The DU1 portion of the first node and its subordinate nodes do not perform a switch. In the final state, the DU1 portion of the first node and its subordinate nodes switch from connecting to the source parent node to connecting to the target parent node, connecting to the CU of the target host node through the target parent node. In the second switching sequence, during the initial transition, neither the first node nor its subordinate nodes perform a switch. In intermediate state 2, the DU1 portion of the first node and its subordinate nodes switch from connecting to the source parent node to connecting to the target parent node, connecting to the CU of the target host node through the target parent node. The MT1 portion of the first node does not perform a switch. In the final state, the MT1 portion of the first node switches from connecting to the source parent node to connecting to the target parent node.

[0152] Combination Figure 4 For intermediate state 1, the MT1 portion of the first node is connected to the CU of the target host node, but the DU1 portion of the first node and its subordinate nodes are connected to the CU of the source host node. The MT1 portion and DU1 portion of the first node are connected to different host nodes. For intermediate state 2, the MT1 portion of the first node is connected to the CU of the source host node, but the DU1 portion of the first node and its subordinate nodes are connected to the CU of the target host node. The MT1 portion and DU1 portion of the first node are connected to different host nodes.

[0153] Taking intermediate state 1 as an example, if the resource configuration of the cell served by the target parent node connected to the MT1 part of the first node is the same as or completely conflicts with the resource configuration of the cell served by the DU1 part of the first node, for example, if the resource configuration of the cell served by the target parent node includes sending messages to the MT1 part of the first node in downlink time slot 1, and the resource configuration of the cell served by the DU1 part of the first node includes sending messages to UE1 in downlink time slot 1, then a conflict occurs in downlink time slot 1. This will result in very few resources (e.g., schedulable time slots) that the MT1 part of the first node can be scheduled in the cell served by the target parent node, and in extreme cases, there may be almost no available scheduling resources. This will prevent the MT1 part of the first node from communicating normally with the target host node. Furthermore, since the services of subordinate nodes also need to be transmitted through the radio backhaul link between the MT1 part of the first node and the target parent node, the service transmission of subordinate nodes will also be affected. The MT1 part and DU1 part of the first node in intermediate state 2 have similar problems to intermediate state 1, which will not be elaborated here.

[0154] Figure 5 This is a schematic diagram illustrating a cross-host dual-connection scenario provided in an embodiment of this application. It should be noted that in the cross-host dual-connection scenario, Figure 5 The source host node shown can be called the main host node, the target host node can be called the auxiliary host node, the source parent node can be called the main parent node, and the target parent node can be called the auxiliary parent node.

[0155] Combination Figure 5The first node first establishes a connection with the source parent node, and then establishes a connection with the target parent node by adding a secondary station. The source parent node connects to the CU of the source host node, and the target parent node connects to the CU of the target host node. After establishing dual connections, the MT1 portion of the first node simultaneously accesses the cell served by both the source parent node (specifically, its DU portion) and the target parent node (specifically, its DU portion), connecting the CU portions of both the source and target host nodes. However, the DU1 portion of the first node only connects to the CU portion of the source host node. If the resource configuration of the target parent node's cell is the same as or almost identical to the resource configuration of the cell served by the DU1 part of the first node, for example, if the resource configuration of the cell served by the target parent node includes sending messages to the MT1 part of the first node in downlink time slot 1, and the resource configuration of the cell served by the DU1 part of the first node includes sending messages to UE1 in downlink time slot 1, a conflict will occur in downlink time slot 1. This will result in very few resources (e.g., schedulable time slots) that the MT1 part of the first node can be scheduled in the cell served by the target parent node. In extreme cases, there will be almost no available scheduling resources. Therefore, even if the first node adds an auxiliary station, it will be almost unusable due to the limited scheduling resources, or the transmission capacity it can provide will be limited, and the advantages of dual connectivity in terms of capacity improvement and robustness improvement cannot be realized.

[0156] To address this issue, this application provides a solution. For ease of description, we will... Figure 8 In this scenario, the IAB nodes that connect the MT part and DU part to different host CUs are called boundary IAB nodes. This scheme aims to adjust the resource configuration of the boundary IAB node DU through coordination between CUs, so that its resource configuration can be staggered with that of the parent node in some time slots, so that the MT part of the boundary IAB node can have the opportunity to be scheduled by the DU of the parent node.

[0157] To make the embodiments of this application clearer, some contents and concepts related to the embodiments of this application will be uniformly introduced here.

[0158] 1. Link, the previous hop node of a node, and the next hop node of a node.

[0159] Link: refers to the path between two adjacent nodes in a path.

[0160] The previous hop node of a node refers to the last node in the path containing that node that received the data packet before that node during uplink or downlink transmission. The previous hop node of a node can also be called the previous hop node of the data packet.

[0161] The next-hop node of a node is the first node in the path that contains that node to receive the data packet during uplink or downlink transmission. The next-hop node of a node can also be called the next-hop node of the data packet.

[0162] 2. Boundary IAB node, target parent node, cell served by the IAB node

[0163] In this embodiment, the boundary IAB node is the IAB node connecting the MT part and the DU part to the CU of different host nodes.

[0164] For example, see Figure 4 In intermediate state 1, the MT portion of the first node is connected to the CU of the target host node, and the DU portion of the first node is connected to the CU of the source host node. In intermediate state 2, the MT portion of the first node is connected to the CU of the source host node, and the DU portion of the first node is connected to the CU of the target host node. This first node can be called a boundary node.

[0165] See also, for example, Figure 5 The MT part of the first node connects the CU of the target host node and the CU of the source host node, and the DU part of the first node connects the CU of the source host node. This first node can be called a boundary node.

[0166] The cells served by an IAB node can include cells served by the DU portion of the IAB node or cells deployed by the DU portion of the IAB node.

[0167] 3. Composition of IAB nodes and host nodes

[0168] An IAB node comprises a mobile terminal (MT) and a distributed unit (DU). When an IAB node faces its parent node, it can act as an MT. When an IAB node faces its child nodes (which can be terminal devices or the MT portion of another IAB node), it can act as a DU and can be considered a network device. An IAB node can establish a radio backhaul link with at least one parent node through its MT portion and a radio access link with at least one child node through its DU portion.

[0169] For example, see Figure 6The UE connects to the host node through IAB Node 2 and IAB Node 1. Both IAB Node 1 and IAB Node 2 include a DU (Distribution Unit) portion and a MT (Media Access Unit) portion. The DU portion of IAB Node 2 provides access services to the UE. The DU portion of IAB Node 1 provides access services to the MT portion of IAB Node 2. The Donor-DU provides access services to the MT portion of IAB Node 1.

[0170] When IAB Node 2 and IAB Node 1 operate in SA networking mode, the host node can connect to the 5G network core (5G core, 5GC). Specifically, the host node's control plane CU-CP connects to control plane network elements (e.g., Access and Mobility Management Functions, AMF) in the 5GC via the NG-C interface, and the host node's user plane CU-UP connects to user plane network elements (e.g., User Plane Functions, UPF) in the 5GC via the NG-U interface.

[0171] When IAB Node 2 and IAB Node 1 are operating in NSA networking mode (or EN-DC mode), the host node's user plane CU-UP can connect to the EPC (e.g., to the serving gateway (SGW)) through the S1 user plane S1-U interface. The MeNB has an LTE Uu air interface connection with the MT part of IAB Node 2, the MT part of IAB Node 1, and the UE. The MeNB has an X2-C interface with the host node's control plane CU-CP. The MeNB connects to the EPC through the S1 interface (the S1 interface includes the S1 interface user plane and the S1 interface control plane).

[0172] Optionally, Figure 6 The MeNB shown can be replaced with a 5G base station gNB (i.e., gNodeB). Figure 6 The LTE-Uu interface shown is replaced with the NR-Uu interface. The gNB can establish user plane and / or control plane interfaces with the 5GC. The gNB and the host node provide dual-link services for IAB Node 1, IAB Node 2, and the UE. The gNB can act as the primary base station or the secondary base station for IAB Node 1, IAB Node 2, and the UE.

[0173] 4. Protocol stack architecture of IAB node, Donor-DU, Donor-CU and terminal

[0174] For example, based on Figure 6 The example shown illustrates the user plane protocol stack architecture for each node. Figure 7 In section (a), the control plane protocol stack architecture of each node can be found in [reference]. Figure 7 (b) in the middle.

[0175] in, Figure 7 The meanings of each protocol layer are as follows: Packet Data Convergence Protocol (PDCP) layer, General Packet Radio Service Tunneling Protocol User Plane (GTP-U) layer, User Datagram Protocol (UDP) layer, Internet Protocol (IP) layer, Layer 2 (L2), Layer 1 (L1), Backhaul Adaptation Protocol (BAP) layer, Radio Link Control (RLC) layer, Medium Access Control (MAC) layer, Physical (PHY) layer, Radio Resource Control (RRC) layer, F1 Application Protocol (F1AP) layer, and Stream Control Transmission Protocol (SCTP) layer. Among these, Layer 2 is the data link layer; for example, Layer 2 can be the data link layer in the Open Systems Interconnection (OSI) reference model. The L1 layer can be a physical layer; for example, the L1 layer can be the physical layer in the OSI reference model.

[0176] It should be noted that, Figure 7 The example shown uses a host node consisting of Donor-DU and Donor-CU. Therefore, Figure 7 The protocol layers of Donor-DU and Donor-CU are shown in the diagram. If the host node is a fully functional entity, the host node only needs to retain the protocol stack of Donor-DU and Donor-CU for their external node interfaces, without the need for the protocol layer on the internal interface between Donor-DU and Donor-CU.

[0177] Additionally, it should be noted that, regardless of whether it is the control plane protocol stack architecture or the user plane protocol stack architecture, when the Donor-DU is the proxy node for the F1 interface between the Donor-CU and the IAB node, the protocol stack architecture of the Donor-DU facing the IAB node includes, above the IP layer, UDP and GTP-U layers that are equivalent to the UDP layer and GTP-U layer in the protocol stack architecture of the DU part in the access IAB node, respectively.

[0178] 5. Protocol layer of F1 interface and protocol layer of wireless backhaul interface

[0179] The F1 interface refers to the logical interface between the IAB node (e.g., the DU portion of the IAB node) and the host node (or Donor-CU or Donor-DU). The F1 interface can also be called the F1* interface, supporting both the user plane (F1-U) and the control plane (F1-C). The protocol layer of the F1 interface refers to the communication protocol layer on the F1 interface.

[0180] For example, the user plane protocol layer of the F1 interface may include one or more of the IP layer, UDP layer, and GTP-U layer. Optionally, the user plane protocol layer of the F1 interface may also include a PDCP layer and / or an IP security (IPsec) layer. IAB nodes and host nodes can perform interface management, manage IAB-DU, and perform UE context-related configurations through the user plane protocol layer of the F1 interface.

[0181] For example, the control plane protocol layer of the F1 interface may include one or more of the IP layer, F1AP layer, and SCTP layer. Optionally, the control plane protocol layer of the F1 interface may also include one or more of the PDCP layer, IPsec layer, and datagram transport layer security (DTLS) layer. IAB nodes and host nodes can perform user plane data transmission and downlink transmission status feedback functions through the control plane protocol layer of the F1 interface.

[0182] A wireless backhaul interface refers to the logical interface between IAB nodes or between an IAB node and a host node (or Donor-DU). The protocol layer of a wireless backhaul interface refers to the communication protocol layer on that interface. The protocol layer of a wireless backhaul interface includes one or more of the following layers: BAP layer, RLC layer, MAC layer, and PHY layer.

[0183] For example, the user plane protocol layer of the F1 interface of the IAB node includes a GTP-U layer, a UDP layer, and an IP layer. See also: Figure 7In (a) of the example, the GTP-U and UDP layers of the IAB node are equivalent to the Donor-CU, and the IP layer is equivalent to the Donor-DU. In another scenario, the Donor-DU acts as a proxy node for the F1 interface between the Donor-CU and the IAB node, and the GTP-U, UDP, and IP layers of the IAB node are equivalent to the Donor-DU. It should be noted that if security protection for the F1 interface is considered, the user plane protocol layer of the F1 interface can also include an IPsec layer and / or a PDCP layer. In one possible implementation, the IPsec layer or PDCP layer is located above the IP layer and below the GTP-U layer.

[0184] For example, the control plane protocol layer of the F1 interface of the IAB node includes the F1AP layer, SCTP layer, and IP layer. See also: Figure 7 In (b) of the example, the F1AP and SCTP layers of the IAB node are equivalent to the Donor-CU, and the IP layer is equivalent to the Donor-DU. In another scenario, the Donor-DU acts as a proxy node for the F1 interface between the Donor-CU and the IAB node, and the F1AP, SCTP, and IP layers of the IAB node are equivalent to the Donor-DU. It should be noted that if security protection for the F1 interface is considered, the control plane protocol layer of the F1 interface can also include one or more of the IPsec, PDCP, and DTLS layers. In one possible implementation, the IPsec, PDCP, or DTLS layer is located above the IP layer and below the F1AP layer.

[0185] It is understandable that when a security protection protocol layer is introduced into the F1 interface protocol layer, then... Figure 7 The protocol stack architecture of some nodes may change; please refer to the text for details. This application embodiment... Figure 7 The protocol stack architecture of each node in the IAB network shown is merely an example. The method provided in this application does not depend on this example, but rather uses this example to make the method provided in this application easier to understand.

[0186] 6. RLC channel

[0187] The RLC channel refers to the channel between the RLC layer and the upper protocol layer (e.g., the BAP layer). In this paper, the RLC channel of an IAB node on the wireless backhaul link can refer to the channel between the RLC layer and the PDCP layer, or it can refer to the channel between the RLC layer and the BAP layer, depending on the upper protocol layer of the RLC layer.

[0188] 7. Protocol Data Unit (PDU)

[0189] In a communication network, the data unit exchanged between peer protocol layer entities of different nodes is called a PDU. A protocol layer passes its PDU to the lower protocol layer through the service access point (SAP) (also known as the service interface) provided by the adjacent lower protocol layer, and the lower protocol layer indirectly completes the exchange of its PDU. The PDU of the lower protocol layer serves as the SDU of the lower protocol layer.

[0190] For example, for a specific protocol layer, if a data packet received by that protocol layer does not include its protocol layer header, then that data packet can be considered an SDU (Simplified Distribution Unit) of that protocol layer. If a data packet received by that protocol layer includes its protocol layer header, then that data packet can be considered a PDU (Programmable Component Unit) of that protocol layer. For instance, for the BAP layer, if a data packet received by the BAP layer does not include its BAP layer header, then that data packet can be considered an SDU of the BAP layer; if a data packet received by the BAP layer includes its BAP layer header, then that data packet can be considered a PDU of the BAP layer.

[0191] The BAP layer's PDUs can be divided into BAP layer control PDUs and BAP layer data PDUs. The BAP layer data PDUs contain user plane data and / or control plane signaling in their BAP layer payload. The BAP layer control PDUs contain BAP layer feedback information, such as flow control feedback, header compression feedback, or other feedback or control information generated by the BAP layer. Specifically, BAP layer control PDUs containing header compression feedback can be called header compression status reports. BAP layer control PDUs containing flow control feedback can be called flow control status reports.

[0192] 8. BAP layer

[0193] The BAP layer possesses at least one of the following capabilities: adding routing information recognizable by the wireless backhaul node to data packets; performing route selection based on the routing information recognizable by the wireless backhaul node; adding identification information related to quality of service (QoS) requirements recognizable by the wireless backhaul node to data packets; performing QoS mapping on multiple links containing the wireless backhaul node for data packets; adding data packet type indication information to data packets; and sending flow control feedback information to nodes with flow control capabilities. It should be noted that the name of the protocol layer possessing these capabilities is not necessarily BAP layer. Those skilled in the art will understand that any protocol layer possessing these capabilities can be understood as the BAP layer in the embodiments of this application.

[0194] The routing information that can be identified by the wireless backhaul node can be one or more of the following: the terminal identifier, the identifier of the IAB node accessed by the terminal, the identifier of the host node, the identifier of the Donor-DU, the identifier of the Donor-CU, and the identifier of the transmission path.

[0195] The QoS mapping on the multi-segment link can be as follows: In the wireless backhaul link, based on the identifier of the RB of the terminal carried by the data packet, perform the mapping from the RB of the terminal to the RLC bearer or RLC channel or logical channel on the wireless backhaul link; Based on the correspondence between any two or more of the RB, RLC bearer, RLC channel and logical channel of the ingress link and the egress link, perform the mapping from the RB or RLC bearer or RLC channel or logical channel of the ingress link to the RB or RLC bearer or RLC channel or logical channel of the egress link.

[0196] The data packet type indication information can be used to indicate that the content encapsulated in the BAP layer contains any one or more of the following types: user plane data of the terminal, RRC messages of the terminal, RRC messages of the IAB node, control layer application messages (e.g., F1AP messages) on the interface between the IAB node and the host node (or Donor-CU or CU-CP), flow control feedback messages generated by the IAB node, header compression feedback messages generated by the IAB node, data PDUs of the BAP layer, control PDUs of the BAP layer, etc.

[0197] Identification information related to QoS requirements can include the QoS flow identifier (QFI) of the terminal, the identifier of the RB of the terminal, the differentiated services code point (DSCP), the flow label in the header of IP packets of Internet Protocol version 6 (IPv6), etc.

[0198] For example, a node with flow control capabilities can be a host node, a Donor-DU, a Donor-CU, or a parent node of an IAB node, etc., that provides backhaul services to the IAB node. The flow control feedback information may include one or more of the following: the cache status and load level of the IAB node; the status of a certain link of the IAB node (such as link blocking, link resume, or link quality information); the bandwidth and transmission latency of a certain link of the IAB node; the sequence numbers of data packets lost by the IAB node; and the sequence numbers of data packets that the IAB node has successfully sent to the terminal or its child nodes.

[0199] Alternatively, the functionality of the BAP layer can be extended by any one or more layers included in layer 2 (e.g., RLC layer, MAC layer, PDCP layer, etc.) without the need for additional protocol layers.

[0200] The following will combine Figures 8-14 The communication method provided in the embodiments of this application will be described in detail.

[0201] For example, Figure 8 This is a flowchart illustrating a communication method provided in an embodiment of this application. This communication method can be applied to... Figure 8 Communication between any two nodes shown.

[0202] like Figure 8 As shown, the communication method includes the following steps:

[0203] S801, the target host node sends the first resource configuration information to the source host node. Correspondingly, the source host node receives the first resource configuration information from the target host node.

[0204] The first resource configuration information includes the current resource configuration information of the target cell. The target cell is the cell served by the target parent node, which is used by the first node to connect with the target host node.

[0205] Optionally, the cell's resource configuration information may include, but is not limited to, one or more of the following: cell frequency information, cell bandwidth information, cell uplink / downlink duplex mode, cell resource configuration, cell synchronization signal block (SSB) transmission configuration (STC), cell common random access resource (rach-ConfigCommon) configuration, cell common IAB-specific random access resource configuration (rach-ConfigCommonIAB-r16), cell channel state information-reference signal (CSI-RS) configuration, cell uplink scheduling request (SR) configuration (SchedulingRequestResourceConfig), the location of the PDCCH transmission configured in SIB1 (PDCCH-ConfigSIB1), common subcarrier spacing (subCarrierSpacingCommon, SCS common) configuration, cell multiplexing capability, etc.

[0206] For example, the uplink and downlink duplex modes of the above-mentioned cell may include time division duplex (TDD) mode and frequency division duplex (FDD) mode.

[0207] For example, the reuse capability of the cell mentioned above refers to the cell served by the IAB node, specifically the reuse capability of the IAB-DU part serving the cell and the co-deployed IAB-MT part, that is, whether the transmission or reception of IAB-DU is allowed to be carried out simultaneously with the transmission or reception of co-deployed IAB-MT.

[0208] For example, the resource configuration of the aforementioned cell may include the attribute configuration of downlink symbols, uplink symbols, and flexible symbols in each slot. If the uplink / downlink duplex mode of the cell is TDD mode, the resource configuration of the cell may also include the position and number of downlink symbols, the position and number of uplink symbols, and the position and number of flexible symbols in each slot.

[0209] The attribute configuration can include a hard mode, a soft mode, and an unavailable mode. Specifically, the hard mode means that the node serving the cell will definitely perform transmission scheduling in this time slot, the unavailable mode means that the node serving the cell will definitely not perform transmission scheduling in this time slot, and the soft mode means that the node serving the cell may or may not perform transmission scheduling in this time slot.

[0210] Based on each of the following configuration information items—the cell's common random access resource (rach-ConfigCommon) configuration, the cell's common IAB-specific random access resource configuration (rach-ConfigCommonIAB-r16), the cell's channel state information-reference signal (CSI-RS) configuration, the cell's uplink scheduling request (SR) configuration (SchedulingRequestResourceConfig), and the location of the PDCCH transmission configured in SIB1 (PDCCH-ConfigSIB1)—the locations of the time-domain and / or frequency-domain resources that the cell will definitely occupy for transmitting these special signals or resources (such as common random access resources, cell reference signals, etc.) can be determined. These time-domain and / or frequency-domain resources can also be regarded as a fixed (hard) mode resource of the cell.

[0211] Combination Figure 9 Taking FDD mode as the uplink / downlink duplex mode and downlink (D) transmission as an example. Combined with... Figure 9 In (a), the resource configuration of the first cell served by IAB 1 includes: time slot 1 is in hard mode, time slot 0 is in not available (NA) mode, and time slot 2 is in soft mode. This means that IAB 1 will definitely perform downlink transmission scheduling for the UE or sub-node in time slot 1, and will definitely not perform downlink transmission scheduling for the UE or sub-node in time slot 0, but may perform downlink transmission scheduling for the UE or sub-node in time slot 2.

[0212] For example, the channel state information-reference signal (CSI-RS) configuration of a cell may include the configuration of non-zero power CSI-RS (NZP-CSI-RS) resources.

[0213] It should be noted that different resource configuration information can be set for different residential communities, and the resource configuration information for different communities can be different. When the community is the target community, the resource configuration information of the above-mentioned community can include the resource configuration information corresponding to the target community. When the community is the first community, the resource configuration information of the above-mentioned community can include the resource configuration information corresponding to the first community. When the community is the second community, the resource configuration information of the above-mentioned community can include the resource configuration information corresponding to the second community. When the community is the third community, the resource configuration information of the above-mentioned community can include the resource configuration information corresponding to the third community, and so on.

[0214] In one possible design, the communication method provided in this application embodiment may further include: the source host node sending a first request message to the target host node. Correspondingly, the target host node receives the first request message from the source host node.

[0215] Optionally, the first request message can be used to request that the host node of the first node be switched from the source host node to the target host node, or to request that the target host node be used as an auxiliary station of the first node.

[0216] For example, the first request message could be a handover request message for switching to the first node. In a cross-host switching scenario, combined with... Figure 4 In the initial state, the source host node requests the target host node to switch the host node of the first node from the source host node to the target host node.

[0217] For example, the first request message could be a request to add a secondary node to the first node. In a cross-host dual-connection scenario, combined with... Figure 5 The source host node requests the target host node to be used as a secondary station of the first node in order to improve the data transmission rate.

[0218] In some embodiments, the first request message includes one or more of the following: first indication information, the identifier of the target cell, or second resource configuration information.

[0219] Optionally, the first indication information is used to indicate that the first node is an IAB node. This first indication information indicates that the first request message is requested for an IAB node, and not for a regular terminal device (UE).

[0220] Optionally, the identifier of the target cell may include the cell identifier of the target cell. Including the identifier of the target cell in the first request message can save the signaling overhead of the target host node in determining the cell served by the target parent node. The type of the identifier of the target cell in this application may include one or more of the following identifiers of the target cell: physical cell identity (PCI), NR cell identity (NCI), NR cell global identity (NCGI), 4G cell identifier (E-UTRA cell identifier, ECI), and 4G cell global identifier (E-UTRAN cell global identifier, ECGI).

[0221] Optionally, the second resource configuration information may include the current resource configuration information of the first cell, which is the cell served by the first node. In this way, the target host node can obtain the current resource configuration information of the first cell served by the first node.

[0222] In one possible design, the communication method provided in this application embodiment may further include: the target host node sending a first response message to the source host node. Correspondingly, the source host node receives the first response message from the target host node.

[0223] Optionally, the first response message can be used to confirm switching the host node of the first node from the source host node to the target host node, or to confirm that the target host node is used as a secondary station of the first node.

[0224] For example, in a cross-host switching scenario, the first response message could be a handover request acknowledge message.

[0225] For example, in a cross-host dual-connection scenario, the first response message can be a secondary node addition request acknowledge message.

[0226] Optionally, the first response message may include first resource configuration information. That is, the target host node can send first resource configuration information to the source host node through the first response message.

[0227] S802, the source host node determines the third resource configuration information, including: determining the third resource configuration information based on the first resource configuration information.

[0228] For example, the third resource configuration information can be used for the resource configuration of the first cell. The third resource configuration information may include resource reconfiguration information of the first cell, which may be determined based on the current resource configuration information of the target cell.

[0229] Optionally, the fixed mode referenced when determining the resource configuration information of a cell can be the time slot attribute configuration in the cell resource configuration being set to a fixed mode or resources in the cell being regarded as fixed modes. In this embodiment of the application, the determination of the resource configuration information of a cell is specifically illustrated by taking the time slot attribute configuration as a fixed mode as an example.

[0230] For example, combined Figure 9 Taking the following transmission as an example, the resource configuration information of the cell includes the cell's resource configuration. Combined with... Figure 9 In section (b), the resource configuration of the target cell served by the target parent node includes: time slot 0 is in fixed mode, time slot 1 is in invalid mode, and time slot 2 is in soft mode. The time slot for downlink scheduling by the first node can be staggered from the time slot for scheduling IAB1 by the target parent node. The determined third resource configuration information includes: time slot 0 is in invalid mode, time slot 1 is in fixed mode, and time slot 2 is in soft mode.

[0231] Therefore, if the target parent node performs downlink transmission scheduling for the first node IAB1 in time slot 0, since the first node will definitely not perform downlink transmission scheduling for the UE in time slot 0, there will be no conflict between the first node and the target parent node in time slot 0, and the target parent node and IAB1 can conduct normal downlink communication in time slot 0. The target parent node will definitely not perform downlink transmission scheduling for the first node IAB1 in time slot 1. If the first node performs downlink transmission scheduling for its served UE or child nodes in time slot 1, the first node can conduct normal downlink communication with its served UE or child nodes in time slot 1. The target parent node may perform downlink transmission scheduling for the first node IAB1 in time slot 2, and the first node may perform downlink transmission scheduling for the UE in time slot 2.

[0232] Specifically, whether the first node performs transmission scheduling in time slot 2 can be determined based on the indication from the target parent node, thus preventing conflicts between the first node and the target parent node in time slot 2. For example, if the target parent node determines that it will perform downlink transmission scheduling for the first node IAB1 in time slot 2, it can instruct the first node (specifically, to instruct the MT part of the first node) not to perform downlink transmission scheduling for the UE or child node served by the first node in that time slot 2 through downlink control information (DCI). Alternatively, if the target parent node determines that it will not perform downlink transmission scheduling for the first node IAB1 in time slot 2, it can instruct the first node to perform downlink transmission scheduling for the UE or child node served by the first node in that time slot 2 through downlink control information (DCI).

[0233] In some embodiments, the third resource configuration information determined by the source host node based on the first resource configuration information may conflict with the current resource configuration information of the target cell. The conflicting time slots can be resolved by the target host node determining the resource reconfiguration information of the target cell, as described in S805-S809 below.

[0234] In some embodiments, the source host node determining the third resource configuration information based on the first resource configuration information may include: the source host node determining the third resource configuration information based on the first resource configuration information and the second resource configuration information.

[0235] Optionally, the third resource configuration information may include the resource reconfiguration information of the first cell, which may include the resource configuration information of the first cell and / or the resource adjustment information of the first cell. In other words, the source host node can determine the resource configuration information of the first cell, or determine to adjust some of the resource configuration information, based on the current resource configuration information of the target cell and the current resource configuration information of the first cell.

[0236] For example, combined Figure 9 In (c) of the example, in downlink transmission, the resource configuration information of a cell includes the cell's resource configuration. The current resource configuration of the target cell served by the target parent node includes: time slot 0 is in fixed mode, time slot 1 is in invalid mode, and time slot 2 is in soft mode. The current resource configuration of the first cell includes: time slot 0 is in fixed mode, time slot 1 is in fixed mode, and time slot 2 is in soft mode. The time slots scheduled by the first node for its served UEs or child nodes can be staggered from the time slots scheduled by the target parent node for IAB1. The determined third resource configuration information includes: time slot 0 is in invalid mode, time slot 1 is in fixed mode, and time slot 2 is in soft mode. The third resource configuration information includes the configuration information of time slots 0, 1, and 2, regardless of whether the current configuration information of these three time slots needs adjustment. Alternatively, the determined third resource configuration information includes: time slot 0 is in invalid mode. In this way, the third resource configuration information only includes the configuration information of time slot 0 that needs adjustment, and does not include the configuration information of time slots 1 and 2 that do not need adjustment, which can save the signaling overhead when the first node reconfigures resources.

[0237] Furthermore, by way of example, in combination Figure 9 In section (d), taking downlink transmission as an example, the resource configuration information of the cell includes the cell's resource configuration. The current resource configuration of the target cell served by the target parent node includes: time slot 0 is in fixed mode, time slot 1 is in invalid mode, and time slot 2 is in soft mode. The current resource configuration of the first cell includes: time slot 0 is in fixed mode, time slot 1 is in invalid mode, and time slot 2 is in soft mode. It is not necessary to completely separate the time slots for the first node to schedule its served UEs or child nodes from the time slots for downlink scheduling by the target parent node. For example, the determined third resource configuration information includes: time slot 0 is in fixed mode, time slot 1 is in fixed mode, and time slot 2 is in soft mode. However, there is a conflict between time slot 0 for the first node to schedule its served UEs or child nodes and time slot 0 for downlink scheduling by the target parent node.

[0238] In other words, the source host node can adjust only the resource configuration information of the conflicting first cell based on the first resource configuration information. The conflicting time slots that are not adjusted can be resolved by the scheduling strategy of the target cell (for example, since the target parent node knows that time slot 0 is a fixed mode for the first node IAB 1, it can try to avoid scheduling downlink transmission for IAB 1 in time slot 0), or the target host node can determine the resource reconfiguration information of the target cell to resolve the issue. For details, please refer to the methods described in S805-S809 below.

[0239] In one possible design, the communication method provided in this application embodiment may further include: the source host node determining the fifth resource configuration information based on the third resource configuration information and / or the first resource configuration information.

[0240] Optionally, the fifth resource configuration information includes the resource reconfiguration information of the second cell. The second cell is a cell served by the second node. The second node is connected to the source host node through the first node. That is, the second node can be regarded as a subordinate node of the first node (specifically, it can be a child node or a grandchild node of the first node, etc.).

[0241] In other words, if there are subordinate IAB nodes of the first node in the network, such as Figures 3-5 The second node shown can be determined by the source host node based on the resource reconfiguration information of the first cell and / or the current resource configuration information of the target cell.

[0242] For example, combined Figure 10 Taking downlink transmission in FDD mode as an example, combining... Figure 10 In (a) of the diagram, it is assumed that the current resource configuration of the target cell served by the target parent node includes: time slot 0 in fixed mode, time slot 1 in invalid mode, and time slot 2 in soft mode. It is also assumed that the third resource configuration information includes: time slot 0 in invalid mode, time slot 1 in fixed mode, and time slot 2 in soft mode. To satisfy the duplex constraints of the MT and DU parts of the second node, the resource configuration information of the second cell can be determined to be consistent with the current resource configuration information of the target cell. Alternatively, the resource configuration information of the second cell can be staggered from the resource reconfiguration information of the first cell. The resulting fifth resource configuration information may include: time slot 0 in fixed mode, time slot 1 in invalid mode, and time slot 2 in soft mode. In this way, both the first node and the second node can perform downlink transmission scheduling normally for their respective served UEs or child nodes.

[0243] In one possible design, the communication method provided in this application embodiment may further include: the source host node determining the fifth resource configuration information based on the third resource configuration information and / or the first resource configuration information, as well as the fourth resource configuration information.

[0244] Optionally, the fourth resource configuration information may include the current resource configuration information of the second cell.

[0245] Optionally, the fifth resource configuration information may include the resource reconfiguration information of the second cell, which may include the resource configuration information and / or the resource adjustment information of the second cell.

[0246] In other words, the source host node can determine the resource configuration information of the second cell based on the resource reconfiguration information of the first cell, the current resource configuration information of the target cell, and / or the current resource configuration information of the second node, or determine to adjust some of the resource configuration information of the second cell.

[0247] For example, combined Figure 10 Taking the following transmission as an example, the resource configuration information of the cell includes the cell's resource configuration. Combined with... Figure 10 In (b), assume the target cell served by the target parent node currently has the following resource configuration: time slot 0 is in fixed mode, time slot 1 is in invalid mode, and time slot 2 is in soft mode. Assume the resource reconfiguration information of the first cell includes: time slot 0 is in invalid mode, time slot 1 is in fixed mode, and time slot 2 is in soft mode. Assume the current resource configuration information of the second cell includes: time slot 0 is in fixed mode, time slot 1 is in fixed mode, and time slot 2 is in soft mode. The determined fifth resource configuration information includes: time slot 0 is in fixed mode, time slot 1 is in invalid mode, and time slot 2 is in soft mode. The fifth resource configuration information includes the configuration information of time slots 0, 1, and 2, regardless of whether the current configuration information of these three time slots needs to be adjusted. Alternatively, the determined fifth resource configuration information includes: time slot 1 is in invalid mode. In this way, the fifth resource configuration information only includes the configuration information of time slot 1 that needs adjustment, and does not include the configuration information of time slots 0 and 2 that do not need adjustment, which can save signaling overhead when the second node reconfigures resources.

[0248] Optionally, similar to the source host node determining the third resource configuration information, the source host node may only adjust the resource configuration information of some conflicting second cells. The conflicting time slots that are not adjusted may be resolved by the scheduling strategy of the first node in the first cell (for example, since the first node knows that time slot 1 is a fixed mode for the second node, it can try to avoid scheduling downlink transmission for the second node in time slot 1), or the resource reconfiguration information of the first cell may be determined by the source host node.

[0249] S803, the source host node sends third resource configuration information to the first node. Correspondingly, the first node receives the third resource configuration information from the source host node.

[0250] Optionally, the source host node can send F1 application protocol (F1AP) messages or RRC messages to the first node. Correspondingly, the first node can receive F1AP messages or RRC messages from the source host node.

[0251] For example, the F1AP message or RRC message may include third resource configuration information, and may also include the identifier of the first cell. Optionally, the F1AP message or RRC message may include indication information indicating that the third resource configuration information is not to be used immediately.

[0252] In one possible design, the communication method provided in this application embodiment may further include: the source host node sending fifth resource configuration information to the second node. Correspondingly, the second node receives the fifth resource configuration information from the source host node.

[0253] Optionally, the source host node can send RRC messages or F1AP messages to the second node. Correspondingly, the second node can receive RRC messages or F1AP messages from the source host node.

[0254] For example, an RRC message may include fifth resource configuration information. An F1AP message may include an F1AP message. Optionally, an F1AP message may include indications that the fifth resource configuration information is not to be used immediately.

[0255] It should be noted that, in this embodiment of the application, the order in which the source host node sends the third resource configuration information to the first node and the order in which the source host node sends the fifth resource configuration information to the second node is not limited.

[0256] In one possible design, the communication method provided in this application embodiment may further include: the source host node sending third resource configuration information to the target host node. Correspondingly, the target host node receives the third resource configuration information from the source host node.

[0257] In this way, the target host node can send the third resource configuration information to the target parent node so that the target parent node can obtain the time slots set to fixed mode in the third resource configuration information. The target parent node can avoid uplink / downlink transmission scheduling for the first node in the fixed mode time slots in these third resource configuration information. In addition, the target parent node can also know the soft mode time slots in the third resource configuration. Thus, the target parent node can use DCI control to instruct the first node whether it can perform downlink transmission scheduling for the UE or child node served by the first node in the time slots set to soft mode.

[0258] S804, the first node configures resources for the first cell based on the third resource configuration information.

[0259] Optionally, the second node configures resources for the second cell based on the fifth resource configuration information.

[0260] In one possible design, prior to S804 above, the communication method provided in this application embodiment may further include: the first node determining that the third resource configuration information is effective.

[0261] Thus, after receiving the third resource configuration information, the first node does not immediately use the third resource configuration information. Instead, after confirming that it is effective, it configures resources for the first cell according to the third resource configuration information.

[0262] Combination Figure 4Taking the first switching order as an example, in the initial state, the host node of the first node has not switched to the target host node, so the first node in the initial state does not need to use the third resource configuration information. When the host node of the MT part of the first node switches to the target host node, such as Figure 4 In intermediate state 1, the MT portion of the first node is connected to the target parent node, and the first node can begin using the third resource configuration information.

[0263] In some embodiments, the source host node may send a first activation indication message to the first node. Optionally, the source host node may include the first activation indication message in an RRC message (e.g., an RRC reconfiguration message) carrying a handover command sent to the MT portion of the first node, or the handover command sent by the source host node to the MT portion of the first node may be considered as an implicit first activation indication message. The handover command may be configuration information used to instruct the MT portion of the first node to hand over to the target cell served by the target parent node, specifically a ReconfigurationwithSync information element (IE).

[0264] In some embodiments, the target host node may send a first activation indication message to the first node.

[0265] Optionally, the first activation indication information can be used to indicate that the third resource configuration information has taken effect. The target host node can send information indicating that the third resource configuration information has taken effect to the first node after determining that the MT portion of the first node is connected to the target parent node.

[0266] In some embodiments, the target parent node may send a first activation indication message to the first node. After determining that the MT portion of the first node is connected to the target parent node, the target parent node may send a message to the first node indicating that the third resource configuration information has taken effect.

[0267] In some embodiments, the first node determining that the third resource configuration information is effective may include: the first node receiving first effectiveness indication information from the target host node or the target parent node, or the first node establishing a connection with the target parent node, or the first node receiving first effectiveness indication information from the source host node.

[0268] Optionally, the first activation indication information can be used to indicate that the third resource configuration information has taken effect. That is, after receiving the explicit or implicit activation indication information, the first node can configure the resources of the first cell according to the third resource configuration information, or it can configure the resources of the first cell according to the third resource configuration information when the first node establishes a connection with the target parent node in the MT part (for example, when performing random access in the target cell served by the target parent node, or when the random access is successful, or when the target parent node sends an RRC reconfiguration completion message to the target IAB host).

[0269] In one possible design, the communication method provided in this application embodiment may further include: a first node sending a second activation indication message to a second node. Correspondingly, the second node receives the second activation indication message from the first node.

[0270] Optionally, the second activation indication information can be used to indicate that the fifth resource configuration information has taken effect. Thus, after receiving the fifth resource configuration information, the second node does not immediately use it; instead, after confirming its effectiveness, it configures resources for the second cell according to the fifth resource configuration information.

[0271] In one possible design, before the second node configures the resources of the second cell according to the fifth resource configuration information, the communication method provided in this application embodiment may further include: the second node determining that the fifth resource configuration information is effective, which may specifically include: the second node receiving the second effective indication information from the first node.

[0272] Thus, after receiving an explicit activation instruction, the second node can configure resources for the second cell based on the fifth resource configuration information.

[0273] based on Figure 8 The communication method shown in S801-S804 involves the source host node receiving the current resource configuration information of the target cell served by the target node from the target host node, and determining the resource reconfiguration information of the first cell served by the first node based on the current resource configuration information of the target cell. This method can satisfy duplex constraints, ensure that IAB nodes can communicate normally, and avoid the situation where the link between the first node and the target parent node is not available due to the conflict between the resource configuration of the first cell and the resource configuration of the target cell after the first node accesses the target parent node. This can improve the availability and capacity of the IAB network.

[0274] Optionally, Figure 8The communication method shown may also include the following S805-S809. The following S805-S809 may be used alone, or the following S805-S809 may be used in combination with the above S801-S804. The embodiments of this application do not limit the order of the following S805-S809 and the above S801-S804.

[0275] S805, the source host node determines the second information.

[0276] Optionally, the second information may include the resource configuration information of the target cell determined by the source host node. That is, the source host node can determine the resource configuration information of the target cell and send it to the target host node, suggesting that the target host node adjust the resource configuration of the target cell according to the second information to avoid conflicts between the resource configuration of the first cell and the resource configuration of the target cell.

[0277] In one possible design approach, S805 above, determining the second information may include: determining the second information based on the second resource configuration information.

[0278] In one embodiment, the second resource configuration information may optionally include the current resource configuration information of the first cell.

[0279] In another embodiment, the second resource configuration information may optionally include the adjusted resource configuration information of the first cell, i.e., the third resource configuration information.

[0280] For example, combined Figure 10 Taking the following transmission as an example, the resource configuration information of the cell includes the cell's resource configuration. Combined with... Figure 10 In case (c), assuming the current or adjusted resource configuration of the first cell includes: time slot 0 is in invalid mode, time slot 1 is in fixed mode, and time slot 2 is in soft mode, then the source host node can determine that the second information includes: time slot 0 is in fixed mode, time slot 1 is in invalid mode, and time slot 2 is in soft mode.

[0281] In one possible design approach, S805 above, determining the second information may include: determining the second information based on the second resource configuration information and the first resource configuration information.

[0282] Optionally, the second information may include the resource configuration recommendation information of the target cell, which may include the resource configuration information of the second cell and / or the resource adjustment information of the second cell.

[0283] For example, combined Figure 10 Taking the following transmission as an example, the resource configuration information of the cell includes the cell's resource configuration. Combined with... Figure 10In (d), assume the current resource configuration of the first cell includes: time slot 0 is in invalid mode, time slot 1 is in fixed mode, and time slot 2 is in soft mode. Assume the current resource configuration of the target cell served by the target parent node includes: time slot 0 is in invalid mode, time slot 1 is in fixed mode, and time slot 2 is in soft mode. Then the source host node can determine that the second information includes: time slot 0 is in fixed mode, time slot 1 is in invalid mode, and time slot 2 is in soft mode. The second information includes the configuration information of time slots 0, 1, and 2, regardless of whether the current configuration information of these three time slots needs to be adjusted. Alternatively, the source host node can determine that the second information includes: time slot 0 is in fixed mode, and time slot 1 is in invalid mode.

[0284] It should be noted that S805 can be executed simultaneously with S802, or before S802, or after S802. This application does not limit this.

[0285] S806, the source host node sends the second information to the target host node. Correspondingly, the target host node receives the second information from the source host node.

[0286] It should be noted that the above-mentioned S806 can be executed simultaneously with the above-mentioned source host node sending the third resource configuration information to the target host node, or before the above-mentioned source host node sending the third resource configuration information to the target host node, or after the above-mentioned source host node sending the third resource configuration information to the target host node. This application does not limit this.

[0287] S807, the target host node determines the sixth resource configuration information, including: determining the sixth resource configuration information based on the third resource configuration information and / or the second information.

[0288] Optionally, the sixth resource configuration information can be used for the resource configuration of the target cell. The sixth resource configuration information may include the resource reconfiguration information of the target cell, which may be determined based on the resource reconfiguration information of the first cell and / or the resource configuration information of the target cell suggested by the source host node.

[0289] The following example illustrates how the target host node determines the sixth resource configuration information based on the second information.

[0290] Combination Figure 10 In example (e), taking downstream transmission and cell resource configuration information as an example, assuming the second information includes: time slot 0 is in fixed mode, time slot 1 is in invalid mode, and time slot 2 is in soft mode, then the target host node can determine that the sixth resource configuration information includes time slot 0 in fixed mode, time slot 1 in invalid mode, and time slot 2 in soft mode. In other words, the target host node can fully accept the source host node's suggestion.

[0291] Combination Figure 10 In the example of (f) in the downstream transmission, the cell's resource configuration information includes the cell's resource configuration. Assume the second information includes: time slot 0 is in fixed mode, time slot 1 is in invalid mode, and time slot 2 is in soft mode. Then the target host node can determine that the sixth resource configuration information includes time slot 0 being in invalid mode, time slot 1 being in fixed mode, and time slot 2 being in soft mode. In other words, the target host node can accept some of the suggestions from the source host node.

[0292] Combination Figure 10 In the example of (g) in downstream transmission, the cell's resource configuration information includes the cell's resource configuration. Assume the second information includes: time slot 0 is in fixed mode, time slot 1 is in invalid mode, and time slot 2 is in soft mode. Then the target host node can determine that the sixth resource configuration information includes time slot 0 in invalid mode, time slot 1 in fixed mode, and time slot 2 in fixed mode. In other words, the target host node can completely reject the source host node's suggestion.

[0293] The following example illustrates how the target host node determines the sixth resource configuration information based on the third resource configuration information.

[0294] Combination Figure 10 In the (h) section, taking downstream transmission and cell resource configuration information as an example, assuming the resource reconfiguration information of the first cell (i.e., the third resource configuration information) includes: time slot 0 is in invalid mode, time slot 1 is in fixed mode, and time slot 2 is in soft mode, then the target host node can determine that the sixth resource configuration information includes time slot 0 in fixed mode, time slot 1 in invalid mode, and time slot 2 in soft mode.

[0295] It should be noted that the target host node determines the sixth resource configuration information based on the third resource configuration information, similar to determining the sixth resource configuration information based on the second information. The transmission scheduling of the determined sixth resource configuration information in time slots may partially or completely conflict with the third resource configuration information. The target host node can renegotiate with the source host node. Examples of determining the sixth resource configuration information based on the third and second information can be combined with examples of determining the sixth resource configuration information based on the second information. These examples are not listed individually in this application.

[0296] Optionally, if the transmission scheduling of the determined sixth resource configuration information in the time slot conflicts partially or completely with the third resource configuration information, the target host node may renegotiate with the source host node; or, the protocol stipulates that after a certain number of negotiations, the target host node modifies the current resource configuration information of the target cell based on the third resource configuration information and / or the second information received from the source host node; or, the protocol stipulates that after a certain number of negotiations, the source host node modifies the current resource configuration information of the first cell based on the current or reconfigured resource configuration information of the target cell received from the target host node, so as to resolve the conflict between the resource configuration of the first cell and the resource configuration of the target cell.

[0297] In some embodiments, the target host node determines the sixth resource configuration information based on the third resource configuration information and / or the second information, which may include: the target host node determines the sixth resource configuration information based on the third resource configuration information and / or the second information, as well as the first resource configuration information.

[0298] Optionally, the sixth resource configuration information may include the resource reconfiguration information of the target cell, which may include the target cell's resource configuration information and / or the target cell's resource adjustment information. In other words, the target host node can determine the target cell's resource configuration information, or determine to adjust some of the target cell's resource configuration information, based on the first cell's resource reconfiguration information and / or the target cell's resource configuration information determined by the source host node, as well as the target cell's current resource configuration information.

[0299] The specific example of the target host node determining the sixth resource configuration information based on the third resource configuration information and the first resource configuration information is similar to the specific example of the source host node determining the third resource configuration information based on the first resource configuration information and the second resource configuration information in S802 above, and will not be repeated here.

[0300] The specific example of determining the sixth resource allocation information based on the second information and the first resource allocation information is similar to the specific example of determining the sixth resource allocation information based on the second information described above, and will not be repeated here.

[0301] Regarding the specific implementation example of determining the sixth resource configuration information based on the third resource configuration information, the second information, and the first resource configuration information, the specific implementation example of determining the sixth resource configuration information based on the third resource configuration information and the first resource configuration information can be combined with the specific implementation example of determining the sixth resource configuration information based on the second information and the first resource configuration information, which will not be elaborated here.

[0302] In one possible design, the communication method provided in this application embodiment further includes: the target host node sending third indication information to the source host node. Correspondingly, the source host node receives the third indication information from the target host node.

[0303] Optionally, the third indication information can be used to instruct the target host node whether to use the second information as resource reconfiguration information for the target cell.

[0304] For example, if the third indication is "yes," it means that the target host node fully accepts the source host node's suggestion. If the third indication is "no," it means that the target host node has not fully accepted the source host node's suggestion or has not accepted the source host node's suggestion at all. Alternatively, in another possible example, if the target host node has not fully accepted the source host node's suggestion, the third indication may specifically indicate which parts of the cell resource configuration suggested by the source host node were accepted by the target host node.

[0305] Thus, if the third indication information is negative, the source host node can adjust the resource configuration information of the target cell or send new second information to the target host node to resolve the conflict between the resource configuration of the first cell and the resource configuration of the target cell.

[0306] In one possible design, the communication method provided in this application embodiment further includes: the target host node determining the eighth resource configuration information based on one or more of the third resource configuration information, the second information, or the sixth resource configuration information.

[0307] Optionally, the eighth resource configuration information may include resource reconfiguration information of the third cell, which is a cell served by the third node, and the third node is connected to the target host node via the target parent node (i.e., the third node is a subordinate node of the target parent node, specifically, it may be a child node or grandchild node of the target parent node). The resource reconfiguration information of the third cell may include resource configuration information and / or resource adjustment information of the third cell.

[0308] In other words, the target host node can determine the resource configuration information of the third cell, or determine to adjust some of the resource configuration information of the third cell, based on one or more of the resource reconfiguration information of the first cell, the resource configuration information of the target cell determined by the source host node, the sixth resource configuration information of the target cell, or the current resource configuration information of the target cell.

[0309] The example of the target host node determining the eighth resource configuration information based on one or more of the third resource configuration information, the second information, or the sixth resource configuration information is similar to the example of the target host node determining the sixth resource configuration information based on the third resource configuration information and / or the second information, and will not be repeated here.

[0310] In one possible design, the communication method provided in this application embodiment further includes: the target host node determining the eighth resource configuration information based on one or more of the third resource configuration information, the second information, or the sixth resource configuration information, and the seventh resource configuration information.

[0311] Optionally, the seventh resource configuration information includes the current resource configuration information of the third cell. That is, the target host node can determine the resource configuration information of the third cell, or determine to adjust part of the resource configuration information of the third cell, based on one or more of the resource reconfiguration information of the first cell, the resource configuration information of the target cell determined by the source host node, the sixth resource configuration information of the target cell determined by the target host node, or the current resource configuration information of the target cell, and the current resource configuration information of the third cell.

[0312] The specific example of the target host node determining the eighth resource configuration information based on one or more of the third resource configuration information, the second information, or the sixth resource configuration information, as well as the seventh resource configuration information, is similar to the specific example of the target host node determining the sixth resource configuration information based on the third resource configuration information and / or the second information, as well as the first resource configuration information, and will not be repeated here.

[0313] S808, the target host node sends the sixth resource configuration information to the target parent node. Correspondingly, the target parent node receives the sixth resource configuration information from the target host node.

[0314] For example, the target host node can send an RRC message or an F1AP message to the target parent node, which carries the sixth resource configuration information.

[0315] Optionally, the RRC message or F1AP message that includes the sixth resource configuration information may also include an indication that the target parent node does not immediately use the sixth resource configuration information.

[0316] In one possible design, the communication method provided in this application embodiment may further include: the target host node sending eighth resource configuration information to a third node. Correspondingly, the third node receives the eighth resource configuration information from the target host node.

[0317] Optionally, the target host node can send RRC messages or FIAP messages to the third node. Correspondingly, the third node can receive RRC messages or FIAP messages from the target host node.

[0318] For example, the RRC message or F1AP message may include eighth resource configuration information, and optionally, it may also include indication information indicating that the third node does not immediately use the eighth resource configuration information.

[0319] It should be noted that, in this embodiment of the application, the order in which the target host node sends the sixth resource configuration information to the target node and the target host node sends the eighth resource configuration information to the third node is not limited.

[0320] In one possible design, the communication method provided in this application embodiment may further include: the target host node sending sixth resource configuration information to the source host node. Correspondingly, the source host node receives the sixth resource configuration information from the target host node.

[0321] In this way, the source host node can obtain the resource reconfiguration information of the target cell.

[0322] S809, the target parent node configures resources for the target cell based on the sixth resource configuration information.

[0323] Optionally, the third node configures resources for the third cell based on the resource configuration information of the eighth cell.

[0324] In one possible design, prior to S809 above, the communication method provided in this application embodiment may further include: the target parent node determining that the sixth resource configuration information is effective.

[0325] Thus, after receiving the sixth resource configuration information, the target parent node does not immediately use the sixth resource configuration information. Instead, it performs resource configuration on the target cell based on the sixth resource configuration information after confirming that the information is effective.

[0326] In some embodiments, the target host node may send a fourth activation indication message to the target parent node.

[0327] Optionally, the fourth activation indication information can be used to indicate that the sixth resource configuration information is effective. After determining that the MT portion of the first node is connected to the target parent node (for example, the target host node receives an uplink message containing the MT portion of the first node from the target parent node, and the uplink message may be an RRC reconfiguration complete message), the target host node may send information indicating that the sixth resource configuration information is effective to the target node.

[0328] In some embodiments, the determination of the sixth resource configuration information by the target parent node may include: the target parent node receiving the fourth activation indication information from the target host node, or the target parent node establishing a connection with the first node (e.g., the first node successfully accessing the target cell served by the target parent node).

[0329] Optionally, the fourth activation indication information is used to indicate that the sixth resource configuration information takes effect. That is, the target node can configure resources for the target cell according to the sixth resource configuration information after receiving the explicit activation indication information, or it can configure resources for the first cell according to the sixth resource configuration information when the MT part of the first node establishes a connection with the target parent node (for example, when the MT part of the first node successfully accesses the target cell served by the target parent node).

[0330] In one possible design, the communication method provided in this application embodiment may further include: the target parent node sending a third effective indication message to the third node.

[0331] In one possible design, the communication method provided in this application embodiment may further include: the target host node sending a third activation indication message to a third node.

[0332] Optionally, the third activation indication information can be used to indicate that the eighth resource configuration information has taken effect. Thus, when the third node receives the eighth resource configuration information, it does not immediately use it; instead, after confirming its effectiveness, it configures the resources of the third cell according to the eighth resource configuration information.

[0333] In one possible design, before the third node configures the resources of the third cell according to the eighth resource configuration information, the communication method provided in this application embodiment may further include: the third node determining that the eighth resource configuration information is effective, which may specifically include: the third node receiving the third effective indication information from the target host node or the target parent node.

[0334] Thus, after receiving an explicit activation instruction, the third node can configure resources for the third cell based on the eighth resource configuration information.

[0335] based on Figure 8 The communication method shown in S805-S809 involves the source host node sending its determined second information and / or third resource configuration information to the target host node, suggesting that the target host node adjust the resource configuration of the target cell based on this second information and / or third resource configuration information. This ensures normal communication between IAB nodes and avoids situations where, after the first node connects to the target parent node, the resource configuration of the first cell conflicts with that of the target cell, resulting in insufficient temporal resources available for the link between the first node and the target parent node. This improves the availability and capacity of the IAB network.

[0336] For example, Figure 11 This is a flowchart illustrating another communication method provided in an embodiment of this application. This communication method can be applied to... Figure 3 Communication between any two nodes shown. For example... Figure 11 As shown, the communication method includes the following steps:

[0337] S1101, the source host node sends the second resource configuration information to the target host node. Correspondingly, the target host node receives the second resource configuration information from the source host node.

[0338] The second resource allocation information includes the current resource allocation information of the first cell.

[0339] The specific implementation methods for the community's resource allocation information and the second resource allocation information can be found in S801 above, and will not be repeated here.

[0340] In one possible design, the communication method provided in this application embodiment may further include: the source host node sending a first request message to the target host node. Correspondingly, the target host node receives the first request message from the source host node.

[0341] Optionally, the first request message can be used to request that the host node of the first node be switched from the source host node to the target host node, or to request that the target host node be used as an auxiliary station of the first node.

[0342] Optionally, the first request message may include one or more of the following: first indication information, the identifier of the target cell, or second resource configuration information.

[0343] Optionally, the first indication information is used to indicate that the first node is an IAB node.

[0344] The specific implementation methods for the first request message, the first instruction information, and the identifier of the target cell can be referred to in S801 above, and will not be repeated here.

[0345] In one possible design, the communication method provided in this application embodiment may further include: the target host node sending a first response message to the source host node. Correspondingly, the source host node receives the first response message from the target host node.

[0346] Optionally, the first response message can be used to confirm switching the host node of the first node from the source host node to the target host node, or to confirm that the target host node is used as a secondary station of the first node.

[0347] Optionally, the first response message may include first resource configuration information.

[0348] The specific implementation of the first response message and the first resource configuration information can be found in S801 above, and will not be repeated here.

[0349] S1102, the target host node determines the sixth resource configuration information, including: determining the sixth resource configuration information based on the second resource configuration information.

[0350] For example, the sixth resource configuration information can be used for the resource configuration of the target cell, which is a cell served by the target parent node, and the target parent node can be used by the first node to connect with the target host node. The sixth resource configuration information may include resource reconfiguration information of the target cell, which may be determined based on the current resource configuration information of the first cell.

[0351] The specific implementation of S1102 is similar to that of S802 above, where the source host node determines the third resource configuration information, including: determining the third resource configuration information based on the first resource configuration information.

[0352] For example, combined Figure 10 In the section (h), taking downlink transmission as an example, the cell's resource configuration information includes the cell's resource configuration. The current resource configuration information of the first cell includes: time slot 0 is in invalid mode, time slot 1 is in fixed mode, and time slot 2 is in soft mode. The time slots used by the target parent node to schedule downlink transmission for the first node can be staggered from the time slots used by the first node to schedule downlink transmission for its served UEs or child nodes. The determined sixth resource configuration information includes: time slot 0 is in fixed mode, time slot 1 is in invalid mode, and time slot 2 is in soft mode. In this way, there will be no conflict between the first node and the target parent node in the downlink time slot transmission scheduling.

[0353] Optionally, the sixth resource configuration information determined by the target host node based on the second resource configuration information may conflict with the current resource configuration information of the first cell. The conflicting time slots can be resolved by the target node's scheduling strategy in the target cell (for example, since the target node knows that time slot 1 is a fixed mode for the first node, it can try to avoid scheduling downlink transmission for the first node in time slot 1), or the source host node can determine the resource reconfiguration information of the first cell to resolve the conflict. For details, please refer to the methods in S1105-S1109 below.

[0354] In some embodiments, the target host node determines the sixth resource configuration information based on the second resource configuration information, which may include: the target host node determines the sixth resource configuration information based on the second resource configuration information and the first resource configuration information.

[0355] Optionally, the sixth resource configuration information may include the resource reconfiguration information of the target cell, which may include the target cell's resource configuration information and / or the target cell's resource adjustment information. In other words, the target host node can determine the resource configuration information of the target cell, or determine to adjust some of the resource configuration information, based on the current resource configuration information of the target cell and the current resource configuration information of the first cell.

[0356] Optionally, the target host node can adjust the resource configuration information of only some conflicting target cells based on the second resource configuration information. The conflicting time slots that are not adjusted are resolved by the source host node determining the resource reconfiguration information of the first cell. For details, please refer to the method described in S1105-S1109 below.

[0357] The specific implementation method of the target host node determining the sixth resource configuration information based on the second resource configuration information and the first resource configuration information is similar to the specific implementation method of the source host node determining the third resource configuration information based on the first resource configuration information and the second resource configuration information in S802 above, and will not be repeated here.

[0358] The specific example of the target host node determining the sixth resource configuration information based on the second and first resource configuration information is similar to the specific example of the source host node determining the third resource configuration information based on the first and second resource configuration information in S802 above, and will not be repeated here.

[0359] In one possible design, the communication method provided in this application embodiment may further include: the target host node determining the eighth resource configuration information based on the second resource configuration information and / or the sixth resource configuration information.

[0360] Optionally, the eighth resource configuration information may include resource reconfiguration information of the third cell, which is a cell served by the third node, and the third node is connected to the target host node via the target parent node. That is, the third node can be a subordinate node of the target parent node, and the target host node can determine the resource reconfiguration information of the third cell served by the subordinate node of the target parent node based on the current resource configuration information of the first cell and / or the resource reconfiguration information of the target cell.

[0361] Regarding the specific example of the target host node determining the eighth resource configuration information based on the second resource configuration information and / or the sixth resource configuration information, it can be referred to the specific example in S802 above, where the source host node determines the fifth resource configuration information based on the third resource configuration information and / or the first resource configuration information, which is similar and will not be repeated here.

[0362] In one possible design, the communication method provided in this application embodiment may further include: the target host node determining the eighth resource configuration information based on the second resource configuration information and / or the sixth resource configuration information and the seventh resource configuration information.

[0363] Optionally, the seventh resource configuration information may include the current resource configuration information of the third cell.

[0364] Optionally, the eighth resource configuration information may include the resource reconfiguration information of the third cell, which may include the resource configuration information and / or resource adjustment information of the third cell. In other words, the target host node can determine the resource configuration information of the third cell, or determine to adjust some of the resource configuration information of the third cell.

[0365] The specific example of the target host node determining the eighth resource configuration information based on the second resource configuration information and / or the sixth resource configuration information and the seventh resource configuration information is similar to the specific example of the source host node determining the fifth resource configuration information based on the third resource configuration information and / or the first resource configuration information and the fourth resource configuration information in S802 above, and will not be repeated here.

[0366] S1103, the target host node sends the sixth resource configuration information to the target parent node. Correspondingly, the target parent node receives the sixth resource configuration information from the target host node.

[0367] Optionally, the target host node can send RRC messages or FIAP messages to the target parent node. Correspondingly, the target node can receive RRC messages or FIAP messages from the target host node.

[0368] For example, the RRC message may include sixth resource configuration information. The F1AP message may also include sixth resource configuration information. Optionally, the RRC message or F1AP message may also include indication information indicating that the target parent node does not immediately use the sixth resource configuration information.

[0369] In one possible design, the communication method provided in this application embodiment may further include: the target host node sending eighth resource configuration information to the third node. Correspondingly, the third node receives the eighth resource configuration information from the target host node. Specific implementation details can be found in the corresponding implementation in S808 above, and will not be repeated here.

[0370] In one possible design, the communication method provided in this application embodiment may further include: the target host node sending sixth resource configuration information to the source host node. Correspondingly, the source host node receives the sixth resource configuration information from the target host node.

[0371] In this way, the source host node can obtain the resource reconfiguration information of the target cell.

[0372] Optionally, the target host node may send sixth resource configuration information to the source host node via a first response message. The first response message may include the sixth resource configuration information.

[0373] S1104, the target parent node configures resources for the target cell based on the sixth resource configuration information.

[0374] Optionally, the third node configures resources for the third cell based on the resource configuration information of the eighth cell.

[0375] In one possible design, prior to S1104 above, the communication method provided in this application embodiment may further include: the target parent node determining that the sixth resource configuration information is effective.

[0376] Thus, when the target parent node receives the sixth resource configuration information, it does not immediately use the sixth resource configuration information. Instead, it performs resource configuration on the target cell based on the sixth resource configuration information after confirming that the information is effective.

[0377] In some embodiments, the target host node may send a fourth activation indication message to the target parent node.

[0378] Optionally, the fourth activation indication information can be used to indicate that the sixth resource configuration information is effective. After determining that the MT portion of the first node is connected to the target parent node (for example, the target host node receives an uplink message containing the MT portion of the first node from the target parent node, and the uplink message may be an RRC reconfiguration complete message), the target host node may send information indicating that the sixth resource configuration information is effective to the target node.

[0379] In some embodiments, the determination of the sixth resource configuration information to be effective by the target parent node may include: the target parent node receiving the fourth effectiveness indication information from the target host node, or the target parent node establishing a connection with the first node.

[0380] Optionally, the fourth activation indication information is used to indicate that the sixth resource configuration information takes effect. That is, the target node can configure resources for the target cell according to the sixth resource configuration information after receiving the explicit activation indication information, or it can configure resources for the target cell according to the sixth resource configuration information when the MT part of the first node establishes a connection with the target parent node (for example, when the MT part of the first node successfully accesses the target cell served by the target parent node).

[0381] In one possible design, the communication method provided in this application embodiment may further include: the target host node or the target parent node sending a third effective indication message to the third node.

[0382] Optionally, the third activation indication information can be used to indicate that the eighth resource configuration information has taken effect. Thus, when the third node receives the eighth resource configuration information, it does not immediately use it; instead, after confirming its effectiveness, it configures the resources of the third cell according to the eighth resource configuration information.

[0383] In one possible design, before the third node configures the resources of the third cell according to the eighth resource configuration information, the communication method provided in this application embodiment may further include: the third node determining that the eighth resource configuration information is effective, which may specifically include: the third node receiving the third effective indication information from the target host node or the target parent node.

[0384] In one possible approach, the target parent node can send a third activation instruction to the third node after determining the effective sixth resource configuration information.

[0385] Thus, after receiving an explicit activation instruction, the third node can configure resources for the third cell based on the eighth resource configuration information.

[0386] based on Figure 11 The communication method shown in S1101-S1104 involves the target host node receiving the current resource configuration information of the first cell served by the first node from the source host node, and determining the resource reconfiguration information of the target cell served by the target parent node based on the current resource configuration information of the first cell. This method can satisfy duplex constraints, ensure that IAB nodes can communicate normally, and avoid the situation where the link between the first node and the target parent node is not available due to the conflict between the resource configuration of the first cell and the resource configuration of the target cell after the first node accesses the target parent node. This can improve the availability and capacity of the IAB network.

[0387] Optionally, Figure 11 The communication method shown may further include the following S1105-S1109. The following S1105-S1109 may be used alone, or the following S1105-S1109 may be used in combination with the above S1101-S1104. The embodiments of this application do not limit the order of the following S1105-S1109 and the above S1101-S1104.

[0388] S1105, the first information for determining the target host node.

[0389] Optionally, the first information may include the resource configuration information of the first cell determined by the target host node. That is, the target host node can determine the resource configuration information of the first cell and send it to the source host node, suggesting that the source host node adjust the resource configuration of the first cell according to the first information to avoid conflicts between the resource configuration of the first cell and the resource configuration of the target cell.

[0390] In one possible design approach, the above-mentioned S1105, determining the first information may include: the target host node determining the first information based on the first resource configuration information.

[0391] For example, combined Figure 9 In (b) of the example, the resource configuration information of the cell is transmitted downstream, including the cell's resource configuration. Assume the current resource configuration of the target cell includes: time slot 0 is in fixed mode, time slot 1 is in invalid mode, and time slot 2 is in soft mode. Then the target host node can determine that the first piece of information includes: time slot 0 is in invalid mode, time slot 1 is in fixed mode, and time slot 2 is in soft mode.

[0392] In one possible design approach, S1105 above, determining the first information may include: determining the first information based on the first resource configuration information and the second resource configuration information.

[0393] Optionally, the first information may include the resource recommended configuration information of the first cell, which may include the resource configuration information and / or the resource adjustment information of the first cell.

[0394] The specific example of determining the first information based on the first resource configuration information and the second resource configuration information is similar to the specific example of determining the second information based on the second resource configuration information and the first resource configuration information in S805 above, and will not be repeated here.

[0395] It should be noted that S1105 can be executed simultaneously with S1102, or before S1102, or after S1102. This application does not limit this.

[0396] S1106, the target host node sends the first information to the source host node. Correspondingly, the source host node receives the first information from the target host node.

[0397] Optionally, the target host node may send first information to the source host node via a first response message. Optionally, the first response message may include first resource configuration information.

[0398] It should be noted that the above-mentioned S1106 can be executed simultaneously with the target host node sending the sixth resource configuration information to the source host node, or before the target host node sends the sixth resource configuration information to the source host node, or after the target host node sends the sixth resource configuration information to the source host node. This application does not limit this.

[0399] S1107, the source host node determines the third resource configuration information, including: determining the third resource configuration information based on the sixth resource configuration information and / or the first information.

[0400] Optionally, the third resource configuration information can be used for the resource configuration of the first cell. The third resource configuration information may include the resource reconfiguration information of the first cell, which may be determined based on the resource reconfiguration information of the target cell and / or the resource configuration information of the first cell suggested by the target host node.

[0401] For example, the source host node determines the third resource configuration information based on the first information, which may specifically include: the source host node fully accepting the target host node's suggestion, or the source host node accepting part of the target host node's suggestion, or the source host node completely rejecting the target host node's suggestion. The specific example is similar to the example in S807 above where the target host node determines the sixth resource configuration information based on the second information, and will not be repeated here.

[0402] Regarding the specific example of the source host node determining the third resource configuration information based on the sixth resource configuration information, as described in S807 above, the specific example of the target host node determining the sixth resource configuration information based on the third resource configuration information is similar and will not be repeated here.

[0403] It should be noted that the source host node determines the third resource configuration information based on the sixth resource configuration information, similar to determining the third resource configuration information based on the first information. The transmission scheduling of the determined third resource configuration information in time slots may partially or completely conflict with the sixth resource configuration information. The target host node can renegotiate with the source host node. This application embodiment will not list all such instances. Examples of determining the third resource configuration information based on the sixth resource configuration information and the first information can be obtained by combining examples of determining the third resource configuration information based on the sixth resource configuration information with examples of determining the third resource configuration information based on the first information. This application embodiment will not list all such instances.

[0404] Optionally, if the transmission scheduling of the determined third resource configuration information in the time slot conflicts partially or completely with the sixth resource configuration information, the source host node may renegotiate with the target host node; or, the protocol stipulates that after a certain number of negotiations, the source host node modifies the current resource configuration information of the first cell based on the sixth resource configuration information and / or the first information received from the target host node; or, the protocol stipulates that after a certain number of negotiations, the target host node modifies the current resource configuration information of the target cell based on the current or reconfigured resource configuration information of the first cell received from the source host node, so as to resolve the conflict between the resource configuration of the first cell and the resource configuration of the target cell.

[0405] In some embodiments, the source host node determining the third resource configuration information based on the sixth resource configuration information and / or the first information may include: the source host node determining the third resource configuration information based on the sixth resource configuration information and / or the first information, as well as the second resource configuration information.

[0406] Optionally, the third resource configuration information may include the resource reconfiguration information of the first cell, which may include the resource configuration information of the first cell and / or the resource adjustment information of the first cell. In other words, the source host node can determine the resource configuration information of the first cell, or determine to adjust some of the resource configuration information of the target cell, based on the resource reconfiguration information of the target cell and / or the resource configuration information of the first cell determined by the target host node, as well as the current resource configuration information of the first cell.

[0407] The implementation method of the source host node determining the third resource configuration information based on the sixth resource configuration information and / or the first information, as well as the second resource configuration information, is similar to the implementation method of the target host node determining the sixth resource configuration information based on the third resource configuration information and / or the second information, as well as the first resource configuration information in S807 above, and will not be repeated here.

[0408] In one possible design, the communication method provided in this application embodiment further includes: the source host node sending second indication information to the target host node. Correspondingly, the target host node receives the second indication information from the source host node.

[0409] Optionally, the second indication information can be used to indicate whether the source host node uses the first information as the resource reconfiguration information for the first cell.

[0410] For example, if the second indication is "yes," it means the source host node fully accepts the target host node's suggestion. If the second indication is "no," it means the source host node has not fully accepted the target host node's suggestion or has not accepted the target host node's suggestion at all. Alternatively, in another possible example, if the source host node has not fully accepted the target host node's suggestion, the second indication may specifically indicate which parts of the cell resource configuration suggested in the target host node's first information were accepted by the source host node.

[0411] Thus, if the second indication information is negative, the target host node can adjust the resource configuration information of the target cell or send new first information to the source host node to resolve the conflict between the resource configuration of the first cell and the resource configuration of the target cell.

[0412] In one possible design, the communication method provided in this application embodiment may further include: the source host node determining the fifth resource configuration information based on one or more of the sixth resource configuration information, the first information, or the third resource configuration information.

[0413] Optionally, the fifth resource configuration information may include resource reconfiguration information of the second cell, which is a cell served by the second node, and the second node is connected to the source host node via the first node. The resource reconfiguration information of the second cell may include resource configuration information and / or resource adjustment information of the second cell.

[0414] In other words, the source host node can determine the resource configuration information of the second cell, or determine to adjust some of the resource configuration information of the second cell, based on one or more of the resource reconfiguration information of the target cell, the resource configuration information of the first cell determined by the target host node, or the current resource configuration information of the first cell.

[0415] The specific implementation method of the source host node determining the fifth resource configuration information based on one or more of the sixth resource configuration information, the first information, or the third resource configuration information is similar to the specific implementation method of the target host node determining the eighth resource configuration information based on one or more of the third resource configuration information, the second information, or the sixth resource configuration information in S807 above, and will not be repeated here.

[0416] In one possible design, the communication method provided in this application embodiment may further include: the source host node determining the fifth resource configuration information based on one or more of the sixth resource configuration information, the first information, or the third resource configuration information, and the fourth resource configuration information.

[0417] Optionally, the fourth resource configuration information may include the current resource configuration information of the second cell, the second cell being the cell served by the second node, and the second node being connected to the source host node via the first node.

[0418] The specific implementation method of the source host node determining the fifth resource configuration information based on the sixth resource configuration information, the first information, or one or more of the third resource configuration information, and the fourth resource configuration information is similar to the specific implementation method of the target host node determining the eighth resource configuration information based on the third resource configuration information, the second information, or one or more of the sixth resource configuration information, and the seventh resource configuration information in S807 above, and will not be repeated here.

[0419] S1108, the source host node sends third resource configuration information to the first node. Correspondingly, the first node receives the third resource configuration information from the source host node.

[0420] For the specific implementation of S1108, please refer to S803 above, which will not be repeated here.

[0421] In one possible design, the communication method provided in this application embodiment may further include: the source host node sending fifth resource configuration information to the second node. Correspondingly, the second node receives the fifth resource configuration information from the source host node. Specific implementation details can be found in the corresponding implementation in S803 above, and will not be repeated here.

[0422] In one possible design, the communication method provided in this application embodiment may further include: the source host node sending third resource configuration information to the target host node. Correspondingly, the target host node receives the third resource configuration information from the source host node.

[0423] In one possible design, the communication method provided in this application embodiment further includes: the target host node sending a first activation indication message to the first node. Correspondingly, the first node receives the first activation indication message from the target host node.

[0424] In one possible design, the communication method provided in this application embodiment further includes: the source host node sending a first activation indication message to the first node. Correspondingly, the first node receives the first activation indication message from the source host node. Optionally, the source host node may carry the first activation indication message in the RRC message (e.g., an RRC reconfiguration message) carrying a handover command sent to the MT part of the first node, or the handover command sent by the source host node to the MT part of the first node may be directly regarded as an implicit first activation indication message. The handover command may be configuration information used to instruct the MT part of the first node to hand over to the target cell served by the target parent node, specifically a ReconfigurationwithSync information element.

[0425] Optionally, the first effective indication information can be used to indicate that the third resource configuration information is effective.

[0426] In some embodiments, the determination of the third resource configuration information taking effect by the first node may include: the first node receiving a first effect indication from the target host node or the target parent node, or the first node establishing a connection with the target parent node; or the first node receiving a first effect indication from the source host node.

[0427] S1109, the first node configures resources for the first cell based on the third resource configuration information.

[0428] Optionally, the second node configures resources for the second cell based on the fifth resource configuration information.

[0429] For details on the specific implementation of S1109, please refer to S804 above, which will not be repeated here.

[0430] based on Figure 11 The communication method shown in S1105-S1109 involves the target host node sending its determined first information and / or the resource reconfiguration information of the target cell to the source host node, suggesting that the source host node adjust the resource configuration of the first cell based on this first information and / or the resource reconfiguration information of the target cell. This satisfies duplex constraints, ensures normal communication between IAB nodes, and avoids insufficient temporal resources available between the first node and the target parent node due to resource configuration conflicts between the first and target cells after the first node connects to the target parent node. This improves the availability and capacity of the IAB network.

[0431] Combination Figure 4 and Figure 5In some possible network topologies, data packets carried on the F1 connection between the DU portion of the first node and the CU portion of the host node may pass through DU portions controlled by other host nodes besides the source host node (e.g., Figure 4 and Figure 5 The DU portion of the target host node shown is transmitted.

[0432] Scenario 1, combined with Figure 4 The MT portion of the first node before the switch ( Figure 4 In the initial state shown, its DU part DU1 establishes an F1 connection with the CU of the source host node, and after the MT part MT1 of the first node switches to connect to the target parent node ( Figure 4 During a period of time in intermediate state 1 shown, the DU part DU1 of the first node needs to transmit data and / or signaling via the F1 interface between the DU part of the target host node and the CU part of the source host node. For example, it communicates with the CU part of the source host node through the path shown by the dashed line in intermediate state 1 (DU1-target parent node-target host DU-source host CU).

[0433] Scenario 2, combined with Figure 4 If the first node supports the deployment of multiple logical DU parts, taking the first node as an example including MT1, DU1, and DU1', before the MT part of the first node is switched ( Figure 4 In the initial state shown, the DU1' of the first node needs to establish an F1 connection between the DU portion of the source host node and the CU of the target host node. Meanwhile, the MT1 portion of the first node switches to connect to the target parent node (…). Figure 4 After intermediate state 1) shown, the first node's DU1' will transmit data and / or signaling via the F1 interface between the DU part of the target host node and the CU part of the target host node. For example, the first node's DU1' will communicate with the CU part of the target host node through the path DU1'-target parent node-target host DU-target host CU.

[0434] Scenario 3, combined with Figure 5 If the first node supports dual connections across host nodes, some or all of the F1 interface services (including user plane services of the F1 interface and / or control plane services of the F1 interface) and non-F1 interface services (such as operation, administration, maintenance, OAM) of the first node's DU portion can be offloaded to Figure 5 Transmission occurs along the transmission path indicated by the dashed line.

[0435] In the above scenarios, since the signaling and / or data on the F1 connection between the DU part of the first node and the CU part of the host node need to be transmitted via a new transmission path, and this new path includes a new host DU, considering that the IP address of the DU part of the IAB node needs to be related to the IP address of the host DU it is connected to (e.g., belonging to the same IP network segment, or the IP address of the DU part of the IAB node is directly an IP address in the address pool maintained by the host DU), this ensures that IP packets sent from the CU of the host node or other network nodes to the IAB node via the IP network can be correctly routed to the host DU connected to the IAB node, and then forwarded to the IAB node via that host DU. It also ensures that uplink IP packets sent by the IAB node via the host DU will not be dropped because they do not meet the forwarding conditions in the source IP address filtering rules deployed on the host DU. Therefore, the first node and its subordinate nodes need to obtain new IP addresses for transmitting data and / or signaling on the F1 interface between its DU part and the CU part of the host node.

[0436] To enable the DU portion of the first node to transmit F1 interface services as quickly as possible using the new transmission path, a new IP address and the configuration of the BAP layer to be used on the new transmission path can be sent to the first node. For example, the new IP address and / or the configuration of the BAP layer to be used on the new transmission path can be carried in the RRC reconfiguration message containing the handover command in the MT portion sent to the first node, or in the RRC reconfiguration message containing the configuration related to adding auxiliary stations in the MT portion sent to the first node.

[0437] However, in the scenarios mentioned above, for the subordinate IAB nodes of the first node, with Figure 4 and Figure 5 Taking the second node as an example, after the first node's MT1 switches to the cell served by the target parent node, the second node also needs to transmit F1 interface data and / or signaling via a new transmission path (hereinafter referred to as the first path), and can also transmit non-F1 interface services (such as OAM services); or, after the first node's MT1 adds the cell group served by the target parent node as a secondary cell group, the second node can migrate some or all of the F1 interface data and / or signaling to the first path, and can also migrate some non-F1 interface services (such as OAM services). The first path includes the DU portion of the first node and the target host node. The following section combines... Figures 12-14 This section explains how the IAB nodes and the UE of the first node communicate through the link between the first node and the host node when the first node connects to multiple host nodes, or when the DU part and the MT part of the first node are not managed by the same host node. Figures 12-14The method shown can be used to allow the second node to successfully transmit services of its F1 interface and services of its non-F1 interface through the first path.

[0438] For example, Figure 12 This is a flowchart illustrating yet another communication method provided in an embodiment of this application. Figure 12 As shown, the communication method includes the following steps:

[0439] S1201, the first node sends the first configuration activation information to the second node. Correspondingly, the second node receives the first configuration activation information from the first node.

[0440] The first configuration activation information is used to indicate the activation of the first Internet Protocol IP address and / or the activation of the first Backhaul Adaptor Protocol (BAP) layer configuration information.

[0441] For example, the first IP address is used by the second node to communicate with the source host node's CU or the target host node's CU through the target host node's DU.

[0442] For example, the first IP address can be used by the second node to communicate with other nodes (such as OAM servers) through the DU of the target host node for non-F1 interface services.

[0443] Combination Figure 4 ,or Figure 5 The second node can use the first IP address to communicate with the source host node's CU or the target host node's CU or other nodes (such as the OAM server) through the target host node's DU.

[0444] Specifically, the first IP address can be an IP address associated with the DU of the target host node (or an IP address anchored on the DU of the target host node). An IP address associated with the DU of the target host node, or an IP address anchored on the DU of the target host node, means that the DU of the target host node can be located using this IP address (for example, the IP address of the IAB node and the IP address of the DU of the target host node belong to the same IP network segment, or the IP address of part of the DU of the IAB node is directly an IP address in the address pool maintained by the DU of the target host node). For example, when the destination address of the data packet is the first IP address, based on the first IP address, the data packet can be forwarded to the DU of the target host node in the IP routing network segment, and then the DU of the target host node forwards the data packet.

[0445] For example, the first BAP layer configuration information is used by the second node to communicate with the source host node's CU or the target host node's CU or other nodes (such as an OAM server) via the target host node's DU.

[0446] In some embodiments, the first BAP layer configuration information includes one or more of the following: a first BAP route identifier, the BAP address of the next-hop node of the second node, the identifier of the default backhaul (BH) radio link control (RLC) channel on the first link, the identifier of the BH RLC channel on the first link corresponding to one or more F1 interface user plane tunnels, the identifier of the BH RLC channel on the first link corresponding to F1AP messages related to the terminal device (UE), the identifier of the BH RLC channel on the first link corresponding to non-UE related F1AP messages, or the identifier of the BH RLC channel on the first link corresponding to non-F1 interface non-F1 services.

[0447] Optionally, the next-hop node of the second node is the next-hop node of the second node in the uplink transmission, that is, the parent node of the second node.

[0448] Optionally, the first link is the link between the second node and the next-hop node of the second node.

[0449] For example, the first BAP routing ID can be a routing ID of the BAP layer. The first BAP routing ID can include a BAP layer address and a BAP path identifier. The BAP layer address can be the address of the DU part of the target host node, and the BAP path identifier can be the identifier of the transmission path between the second node and the DU part of the target host node.

[0450] In some embodiments, optionally, after determining that a transmission path has been established between the first node and the target host DU, the first node sends a first configuration activation message to the second node. For example, the first node may determine that a transmission path has been established between it and the target host DU after the target parent node has successfully accessed the system randomly; or, the first node may determine that a transmission path has been established between it and the target host DU after the target parent node sends an uplink RRC message (e.g., an RRC reconfiguration complete message).

[0451] In some embodiments, optionally, the first node may send the first configuration activation information to the second node after receiving an RRC reconfiguration message containing a switching command from the source host node (specifically, the CU of the source host node or the CU-CP of the source host node); or, after receiving an RRC reconfiguration message containing configurations for the first node to add auxiliary stations from the source host node (specifically, the CU of the source host node or the CU-CP of the source host node), the first node may send the first configuration activation information to the second node.

[0452] In some embodiments, the first configuration activation information may be carried in the Protocol Data Unit (PDU) of the BAP layer or the MAC control element (CE) of the data link layer.

[0453] In some embodiments, the first configuration activation information may include a first index value and / or a second index value, wherein the first index value is used to indicate at least one first IP address and the second index value is used to indicate at least one BAP layer configuration information.

[0454] In some embodiments, the first index value and the second index value may be the same index value.

[0455] In some embodiments, the first configuration activation information may include the identifier of the target host node.

[0456] For example, the first configuration activation information may include the identifier of the gNB corresponding to the second node, the identifier of the DU portion of the target host node (such as the DU ID of the target host node, or the BAP address of the DU of the target host node, or the IP address of the DU of the target host node), and the identifier of the CU portion of the target host node (gNB CU ID, or the IP address of the CU of the target host node). In this case, when the second node obtains a new IP address or a new set of BAP layer configuration information, it also carries the corresponding gNB identifier, the identifier of the DU portion of the target host node, or the identifier of the CU portion of the target host node, corresponding to the new IP address or the new BAP layer configuration. Thus, the second node can determine which set of IP addresses and / or which set of BAP layer configuration information to use for communication based on these identifiers.

[0457] Optionally, the second node can send an indication to its subordinate nodes that it has connected to the target host node. Based on the received indication, the subordinate nodes of the second node can stop using the old IP address and can also stop using the BAP layer configuration used before obtaining the first BAP layer configuration.

[0458] Optionally, the second node may send configuration activation indication information to its child nodes, for the child nodes to activate the second IP address and / or the second BAP layer configuration information. The second IP address and the second BAP layer configuration information obtained by the child node are used to communicate with the source host node CU or the target host CU or other nodes (e.g., the OAM server) via a new path through the first node, where the new path of the first node includes the DU of the target host node.

[0459] In some embodiments, the communication method provided in this application may further include: the source host node (specifically, the CU of the source host node, or the CU-CP of the source host node) sending a first IP address and / or first BAP layer configuration information to the second node via RRC messages or FIAP messages. Correspondingly, the second node receives the first IP address and / or first BAP layer configuration information from the source host node via RRC messages or FIAP messages.

[0460] Optionally, the source host node may send the first IP address and / or the first BAP layer configuration information to the second node before the first node's MT part is connected to the target parent node.

[0461] Optionally, the source host node may send an indication to the second node that the first IP address will not be used immediately and / or that the first BAP layer configuration information will not be used immediately. Correspondingly, the second node receives the indication from the source host node that the first IP address will not be used immediately and / or that the first BAP layer configuration information will not be used immediately.

[0462] Optionally, the second node may not immediately use the first IP address to communicate with the CU of the target host node or the CU of the source host node via the F1 interface. The second node may not immediately use the first BAP layer configuration information to communicate with the CU of the target host node or the CU of the source host node.

[0463] For example, communication on the F1 interface may include one or more of the following: establishing a Stream Control Transport Protocol (SCTP) association between the first IP address and the CU portion of the source host node, performing IPsec security negotiation, establishing an F1 connection, transmitting user plane data services of the F1 interface using the first IP address, or transmitting control plane signaling (i.e., F1AP messages) of the F1 interface using the first IP address, etc.

[0464] S1202, the second node communicates with the CU of the source host node or the CU of the target host node using the first IP address and / or the first BAP layer configuration information.

[0465] based on Figure 12The communication method shown allows the second node to communicate with the CU of the source host node or the CU of the target host node after obtaining the first IP address and / or the first BAP layer configuration information. This is possible without using the configuration initially. After receiving the first configuration activation information, the second node can communicate normally with the CU of the source host node or the CU of the target host node using the first IP address and / or the first BAP layer configuration information. This allows the second node to communicate normally with the CU of the source host node or the CU of the target host node when the first node is connected to multiple host nodes or when the DU part and the MT part of the first node are not managed by the same host node.

[0466] For example, Figure 13 This is a flowchart illustrating another communication method provided in an embodiment of this application. Figure 13 As shown, the communication method includes the following steps:

[0467] S1301, the source host node determines that the first condition is met and sends the first message to the second node. Accordingly, the second node receives the first message from the source host node.

[0468] The first condition includes: receiving a release message or a successful switch message from the target host node; or receiving an indication from the first node's mobile terminal MT part that has successfully connected to the target host node; or determining that the control plane of the first node's F1 interface has been switched to the second Internet Protocol IP address.

[0469] The release message can be used to instruct the source host node to release the MT portion of the first node.

[0470] For example, the release message may include a context notification message that releases the MT portion of the first node.

[0471] For example, a successful switchover message can be used to indicate that the MT portion of the first node has been successfully switched from the source host node to the target host node. Figure 4 As shown in intermediate state 1, the MT1 of the first node has been connected to the target parent node.

[0472] Optionally, after receiving the RRC reconfiguration completion message of the MT part of the first node, the target host node may send an indication message to the source target host node through the Xn interface between the target host node and the source target host node, indicating that the mobile terminal MT part of the first node has been successfully connected to the target host node.

[0473] For example, the second IP address can be used by the first node to communicate with the source host node's CU via the target host node's DU. Thus, when the first node uses the second IP address to communicate with the source host node's CU, it can be indicated that the first node's MT portion has successfully connected to the target host node.

[0474] For example, the first message includes a first IP address and / or first backhaul adaptation protocol (BAP) layer configuration information.

[0475] For example, the first IP address can be used by the second node to communicate with the source host node's CU or the target host node's CU or other nodes (such as an OAM server) through the target host node's DU. The specific implementation of the first IP address can be found in S1201 above, and will not be repeated here.

[0476] For example, the first BAP layer configuration information can be used by the second node to communicate with the CU of the source host node or the CU of the target host node. The specific implementation of the first BAP layer configuration information can be found in S1201 above, and will not be repeated here.

[0477] Optionally, the first BAP layer configuration information may include one or more of the following: a first BAP route identifier, the BAP address of the next-hop node of the second node, the identifier of the default backhaul BH radio link control (RLC) channel on the first link, the identifier of the BH RLC channel on the first link corresponding to one or more F1 interface user plane tunnels, the identifier of the BH RLC channel on the first link corresponding to F1AP messages related to the terminal device (UE), the identifier of the BH RLC channel on the first link corresponding to non-UE related F1AP messages, or the identifier of the BH RLC channel on the first link corresponding to non-F1 interface non-F1 services. Optionally, the next-hop node of the second node is the next-hop node of the second node in uplink transmission, i.e., the parent node of the second node. The first link is the link between the second node and its next-hop node. For the specific implementation of the first BAP layer configuration information, please refer to S1201 above, which will not be repeated here.

[0478] In some embodiments, the communication method provided in this application may further include: the source host node sending a first IP address and / or first BAP layer configuration information to a second node via an RRC message or a FIAP message. Correspondingly, the second node receives the first IP address and / or first BAP layer configuration information from the source host node via an RRC message or a FIAP message.

[0479] In some embodiments, the communication method provided in this application may further include: the CU portion of the target host node sending a first IP address and / or first BAP layer configuration information to a second node via an RRC message. Correspondingly, the second node receives the first IP address and / or first BAP layer configuration information from the target host node via an RRC message or an F1AP message.

[0480] S1302, the second node communicates with the CU of the source host node or the CU of the target host node using the first IP address and / or the first BAP layer configuration information.

[0481] based on Figure 13 The communication method shown involves the source host node, after determining that the MT part of the first node has successfully connected to the target host node, sending the first IP address and / or the first BAP layer configuration information to the second node. This enables the second node to communicate with the CU of the source host node or the CU of the target host node using the first IP address and / or the first BAP layer configuration information. Thus, when the first node is connected to multiple host nodes, or when the DU part and the MT part of the first node are not managed by the same host node, the second node can communicate normally with the CU of the source host node or the CU of the target host node.

[0482] For example, Figure 14 This is a flowchart illustrating another communication method provided in an embodiment of this application. Figure 14 As shown, the communication method includes the following steps:

[0483] S1401, the source host node sends a first IP address and / or first BAP layer configuration information to the first node. Correspondingly, the first node receives the first Internet Protocol (IP) address and / or Backhaul Protocol Adaptor (BAP) layer configuration information from the source host node.

[0484] For example, the first IP address is used by the second node to communicate with the centralized unit (CU) of the source host node or the CU of the target host node through the distributed unit (DU) of the target host node. The specific implementation of the first IP address can be found in S1201 above, and will not be repeated here.

[0485] For example, the first BAP layer configuration information is used for communication between the second node and the CU of the source host node or the CU of the target host node. The specific implementation of the first BAP layer configuration information can be found in S1201 above, and will not be repeated here.

[0486] In some embodiments, the first BAP layer configuration information may include one or more of the following: a first BAP route identifier, the BAP address of the next-hop node of the second node, the identifier of the default backhaul BH radio link control (RLC) channel on the first link, the identifier of the BH RLC channel on the first link corresponding to one or more F1 interface user plane tunnels, the identifier of the BH RLC channel on the first link corresponding to F1AP messages related to the terminal device (UE), the identifier of the BH RLC channel on the first link corresponding to non-UE related F1AP messages, or the identifier of the BHRLC channel on the first link corresponding to non-F1 interface non-F1 services. Optionally, the next-hop node of the second node is the next-hop node of the second node in uplink transmission, i.e., the parent node of the second node. The first link is the link between the second node and its next-hop node. For the specific implementation of the first BAP layer configuration information, please refer to S1201 above; it will not be repeated here.

[0487] S1402, the source host node sends a first transmission instruction message to the first node. Correspondingly, the first node receives the first transmission instruction message from the source host node.

[0488] The first sending instruction information can be used to instruct the first node to send the first IP address and / or the first BAP layer configuration information to the second node after the first node has successfully established a connection with the target parent node.

[0489] S1403, after the first node successfully establishes a connection with the target parent node, the first node sends a first IP address and / or first BAP layer configuration information to the second node. Correspondingly, the second node receives the first IP address and / or first BAP layer configuration information from the first node.

[0490] For example, after the control plane of the F1 interface of the first node has been switched to the second IP address, the first node sends the first IP address and / or the first BAP layer configuration information to the second node. The specific implementation of the second IP address can be found in S1301 above, and will not be repeated here.

[0491] S1404, the second node communicates with the CU of the source host node or the CU of the target host node or other nodes (e.g., OAM server) using the first IP address and / or the first BAP layer configuration information.

[0492] based on Figure 14The communication method shown involves the first node sending a first IP address and / or first BAP layer configuration information to the second node after successfully establishing a connection with the target parent node, according to the instructions of the source host node. This enables the second node to communicate with the CU of the source host node or the CU of the target host node using the first IP address and / or the first BAP layer configuration information. Thus, when the first node is connected to multiple host nodes, or when the DU part and the MT part of the first node are not managed by the same host node, the second node can communicate normally with the CU of the source host node or the CU of the target host node.

[0493] The above combination Figures 8-14 The communication method provided in the embodiments of this application is described in detail below. Figures 15-19 The communication device provided in the embodiments of this application is described in detail.

[0494] For example, Figure 15 This is a schematic diagram of the structure of the communication device provided in the embodiments of this application. Figure 1 .like Figure 15 As shown, the communication device 1500 includes a transceiver module 1501 and a processing module 1502. For ease of explanation, Figure 15 Only the main components of the communication device are shown.

[0495] In one possible design, the communication device 1500 can be adapted to... Figure 3 In the communication system shown, the execution Figure 8 or Figure 11 The function of the source host node in the communication method shown.

[0496] The transceiver module 1501 is used to receive one or more of the following from the target host node: first resource configuration information, sixth resource configuration information, or first information. The processing module 1502 is used to determine third resource configuration information, including: determining the third resource configuration information based on the first resource configuration information, or, based on the sixth resource configuration information and / or the first information; determining the third resource configuration information. The transceiver module 1501 is also used to send the third resource configuration information to the first node.

[0497] The first resource configuration information includes the current resource configuration information of the target cell; the sixth resource configuration information includes the resource reconfiguration information of the target cell; the target cell is the cell served by the target parent node; and the target parent node is used for connection between the first node and the target host node. The first information includes the resource configuration information of the first cell determined by the target host node, and the first cell is the cell served by the first node. The third resource configuration information is used for the resource configuration of the first cell.

[0498] In one possible design, the processing module 1502 is further configured to determine third resource configuration information based on the first resource configuration information and the second resource configuration information. The second resource configuration information may include the current resource configuration information of the first cell.

[0499] In one possible design, the processing module 1502 is further configured to determine third resource configuration information based on the sixth resource configuration information and / or the first information, as well as the second resource configuration information. The second resource configuration information may include the current resource configuration information of the first cell.

[0500] In one possible design, the processing module 1502 is further configured to determine second information based on the second resource configuration information. The second resource configuration information may include the current resource configuration information of the first cell, and the second information may include the resource configuration information of the target cell determined by the source host node.

[0501] In one possible design, the processing module 1502 is further configured to determine second information based on the second resource configuration information and the first resource configuration information. The second resource configuration information may include the current resource configuration information of the first cell, and the second information may include the resource configuration information of the target cell determined by the source host node.

[0502] In one possible design, the transceiver module 1501 is also used to send a second message to the target host node.

[0503] In one possible design, the processing module 1502 is further configured to determine fifth resource configuration information based on the third resource configuration information and / or the first resource configuration information. The fifth resource configuration information includes resource reconfiguration information for the second cell, which is a cell served by the second node, and the second node is connected to the source host node via the first node.

[0504] In one possible design, the processing module 1502 is further configured to determine fifth resource configuration information based on the third resource configuration information and / or the first resource configuration information, as well as the fourth resource configuration information. The fourth resource configuration information may include the current resource configuration information of the second cell, the second cell being a cell that the second node can serve, and the second node being connected to the source host node via the first node. The fifth resource configuration information may include resource reconfiguration information of the second cell.

[0505] In one possible design, the processing module 1502 is further configured to determine fifth resource configuration information based on one or more of the sixth resource configuration information, the first information, and the third resource configuration information. The fifth resource configuration information may include resource reconfiguration information of the second cell, which is a cell that can be served by the second node, and the second node is connected to the source host node via the first node.

[0506] In one possible design, the processing module 1502 is further configured to determine fifth resource configuration information based on one or more of the sixth resource configuration information, the first information, and the third resource configuration information, as well as the fourth resource configuration information. The fourth resource configuration information may include the current resource configuration information of the second cell, and the fifth resource configuration information may include resource reconfiguration information of the second cell. The second cell is a cell served by the second node, and the second node is connected to the source host node via the first node.

[0507] In one possible design, the transceiver module 1501 is also used to send the fifth resource configuration information to the second node.

[0508] In one possible design, the transceiver module 1501 is further configured to send a second activation indication message to the second node; wherein the second activation indication message is used to indicate that the fifth resource configuration information has taken effect.

[0509] In one possible design, the transceiver module 1501 is also used to send third resource configuration information to the target host node.

[0510] In one possible design, the transceiver module 1501 is further configured to send a first request message to the target host node. This first request message can be used to request a switch of the first node's host node from the source host node to the target host node, or to request that the target host node be used as a secondary station of the first node.

[0511] In one possible design, the first request message may include one or more of the following: first indication information, the identifier of the target cell, or second resource configuration information. The first indication information can be used to indicate that the first node is an integrated access backhaul (IAB) node, and the second resource configuration information may include the current resource configuration information of the first cell.

[0512] In one possible design, the transceiver module 1501 is further configured to receive a first response message from the target host node. This first response message can be used to confirm switching the host node of the first node from the source host node to the target host node, or to confirm that the target host node is used as a secondary station of the first node.

[0513] In one possible design, the first response message may include one or more of the following: first resource configuration information, sixth resource configuration information, or first information.

[0514] In one possible design, the transceiver module 1501 is further configured to send second indication information to the target host node. The second indication information can be used to instruct the source host node whether to use the first information as resource reconfiguration information for the first cell.

[0515] In one possible design, the transceiver module 1501 is further configured to receive third indication information from the target host node. This third indication information can be used to instruct the target host node whether to use the second information as resource reconfiguration information for the target cell.

[0516] In one possible design, the transceiver module 1501 is further configured to send a first activation indication message to the first node. This first activation indication message is used to indicate that the third resource configuration information has taken effect.

[0517] It should be noted that the transceiver module 1501 may include a receiving module and a sending module. The receiving module is used to receive data and / or signaling from the target host node, the first node, or the second node; the sending module is used to send data and / or signaling to the target host node, the first node, or the second node. This application does not specifically limit the specific implementation of the transceiver module.

[0518] Optionally, the communication device 1500 may also include a storage module. Figure 15 (Not shown in the image), this storage module stores programs or instructions. When the processing module executes the program or instructions, it enables the communication device 1500 to perform operations. Figure 8 or Figure 11 The function of the source host node in the communication method shown.

[0519] It should be noted that the communication device 1500 can be Figure 3 The target host node shown can also be a chip (system) or other component or part that can be set on the target host node, and this application does not limit this.

[0520] In addition, the technical effects of the communication device 1500 can be referenced. Figure 8 or Figure 11 The technical effects of the communication method shown will not be elaborated here.

[0521] In another possible design scheme, Figure 15 The communication device 1500 shown is applicable to Figure 3 In the communication system shown, the execution Figure 8 or Figure 11The function of the target host node in the communication method shown.

[0522] The transceiver module 1501 is used to receive one or more of the following from the source host node: second resource configuration information, third resource configuration information, or second information. The processing module 1502 is used to determine the sixth resource configuration information, including: determining the sixth resource configuration information based on the second resource configuration information; or, determining the sixth resource configuration information based on the third resource configuration information and / or the second information. The transceiver module 1501 is also used to send the sixth resource configuration information to the target parent node.

[0523] The second resource configuration information includes the current resource configuration information of the first cell; the third resource configuration information includes the resource reconfiguration information of the first cell; the first cell is a cell served by the first node; the second information includes the resource configuration information of the target cell determined by the source host node; the target cell is a cell served by the target parent node; the target parent node is used for the connection between the first node and the target host node; and the sixth resource configuration information is used for the resource configuration of the target cell.

[0524] In one possible design, the processing module 1502 is further configured to determine sixth resource configuration information based on the second resource configuration information and the first resource configuration information. The first resource configuration information may include the current resource configuration information of the target cell.

[0525] In one possible design, the processing module 1502 is further configured to determine sixth resource configuration information based on the third resource configuration information and / or the second information, as well as the first resource configuration information. The first resource configuration information may include the current resource configuration information of the target cell.

[0526] In one possible design, the processing module 1502 is further configured to determine first information based on the first resource configuration information. The first resource configuration information may include the current resource configuration information of the target cell, and the first information may include the resource configuration information of the first cell determined by the target host node.

[0527] In one possible design, the processing module 1502 is further configured to determine first information based on the first resource configuration information and the second resource configuration information. The first resource configuration information may include the current resource configuration information of the target cell, and the first information may include the resource configuration information of the first cell determined by the target host node.

[0528] In one possible design, the transceiver module 1501 is also used to send the first information to the source host node.

[0529] In one possible design, the processing module 1502 is further configured to determine eighth resource configuration information based on the second resource configuration information and / or the sixth resource configuration information. The eighth resource configuration information may include resource reconfiguration information for a third cell, which can be a cell served by a third node, and the third node is connected to the target host node via a target parent node.

[0530] In one possible design, the processing module 1502 is further configured to determine the eighth resource configuration information based on the second resource configuration information and / or the sixth resource configuration information, as well as the seventh resource configuration information. The seventh resource configuration information may include the current resource configuration information of the third cell, the third cell being a cell served by the third node, and the third node being connected to the target host node via the target parent node. The eighth resource configuration information may include the resource reconfiguration information of the third cell.

[0531] In one possible design, the processing module 1502 is further configured to determine eighth resource configuration information based on one or more of the third resource configuration information, the second information, and the sixth resource configuration information. The eighth resource configuration information may include resource reconfiguration information for a third cell, which can be a cell served by a third node, and the third node is connected to the target host node via a target parent node.

[0532] In one possible design, the processing module 1502 is further configured to determine the eighth resource configuration information based on one or more of the third resource configuration information, the second information, and the sixth resource configuration information, as well as the seventh resource configuration information. The seventh resource configuration information may include the current resource configuration information of the third cell, and the eighth resource configuration information may include the resource reconfiguration information of the third cell. The third cell can be a cell served by the third node, and the third node is connected to the target host node via the target parent node.

[0533] In one possible design, the transceiver module 1501 is also used to send the eighth resource configuration information to the third node.

[0534] In one possible design, the transceiver module 1501 is also used to send sixth resource configuration information to the source host node.

[0535] In one possible design, the transceiver module 1501 is further configured to receive a first request message from the source host node. This first request message can be used to request a switch of the first node's host node from the source host node to the target host node, or to request the target host node to be used as a secondary station of the first node.

[0536] In one possible design, the first request message may include one or more of the following: first indication information, the identifier of the target cell, or second resource configuration information. The first indication information may be used to indicate that the first node is an integrated access backhaul (IAB) node, and the second resource configuration information may include the current resource configuration information of the first cell.

[0537] In one possible design, the transceiver module 1501 is further configured to send a first response message to the source host node. This first response message can be used to confirm switching the host node of the first node from the source host node to the target host node, or to confirm that the target host node is designated as a secondary station of the first node.

[0538] In one possible design, the first response message may include one or more of the following: first resource configuration information, sixth resource configuration information, or first information.

[0539] In one possible design, the transceiver module 1501 is further configured to receive second indication information from the source host node. This second indication information can be used to instruct the source host node whether to use the first information as resource reconfiguration information for the first cell.

[0540] In one possible design, the transceiver module 1501 is further configured to send third indication information to the source host node. This third indication information can be used to instruct the target host node whether to use the second information as resource reconfiguration information for the target cell.

[0541] In one possible design, the transceiver module 1501 is further configured to send a first effective indication message to the first node. This first effective indication message can be used to indicate that the third resource configuration information has taken effect.

[0542] In one possible design, the transceiver module 1501 is also used to send a third activation indication message to the third node. This third activation indication message can be used to indicate that the eighth resource configuration information has taken effect.

[0543] In one possible design, the transceiver module 1501 is further configured to send a fourth activation indication message to the target parent node. This fourth activation indication message can be used to indicate that the sixth resource configuration information has taken effect.

[0544] It should be noted that the transceiver module 1501 may include a receiving module and a sending module. The receiving module is used to receive data and / or signaling from the source host node, the first node, the second node, the target parent node, or the third node; the sending module is used to send data and / or signaling to the source host node, the first node, the second node, the target parent node, or the third node. This application does not specifically limit the specific implementation of the transceiver module.

[0545] Optionally, the communication device 1500 may also include a storage module. Figure 15 (Not shown in the image), this storage module stores programs or instructions. When the processing module executes the program or instructions, it enables the communication device 1500 to perform operations. Figure 8 or Figure 11 The function of the target host node in the communication method shown.

[0546] It should be noted that the communication device 1500 can be Figure 3 The target host node shown can also be a chip (system) or other component or part that can be set on the target host node, and this application does not limit this.

[0547] In addition, the technical effects of the communication device 1500 can be referenced. Figure 8 or Figure 11 The technical effects of the communication method shown will not be elaborated here.

[0548] In another possible design, the communication device 1500 can be applied to Figure 3 In the communication system shown, the execution Figure 8 or Figure 11 The function of the first node in the communication method shown.

[0549] The transceiver module 1501 is used to receive third resource configuration information from the source host node. The processing module 1502 is used to determine that the third resource configuration information is effective, including: receiving first effectiveness indication information from the target host node, target parent node, or source host node, or establishing a connection with the target parent node; and configuring resources for the first cell according to the third resource configuration information. The third resource configuration information is used for resource configuration of the first cell, the first cell is a cell served by the first node, and the first effectiveness indication information is used to indicate that the third resource configuration information is effective.

[0550] In one possible design, the transceiver module 1501 is further configured to send a second activation indication message to the second node. This second activation indication message can be used to indicate that the fifth resource configuration information has taken effect.

[0551] It should be noted that the transceiver module 1501 may include a receiving module and a sending module. The receiving module is used to receive data and / or signaling from the source host node, the second node, the target parent node, or the target host node; the sending module is used to send data and / or signaling to the source host node, the second node, the target parent node, or the target host node. This application does not specifically limit the specific implementation of the transceiver module.

[0552] Optionally, the communication device 1500 may also include a storage module. Figure 15 (Not shown in the image), this storage module stores programs or instructions. When the processing module executes the program or instructions, it enables the communication device 1500 to perform operations. Figure 8 or Figure 11 The function of the first node in the communication method shown.

[0553] It should be noted that the communication device 1500 can be Figure 3 The first node shown can also be a chip (system) or other component or part that can be set on the first node, and this application does not limit this.

[0554] In addition, the technical effects of the communication device 1500 can be referenced. Figure 8 or Figure 11 The technical effects of the communication method shown will not be elaborated here.

[0555] In another possible design, the communication device 1500 can be applied to Figure 3 In the communication system shown, the execution Figure 8 or Figure 11 The function of the target parent node in the communication method shown.

[0556] The transceiver module 1501 is further configured to receive sixth resource configuration information from the target host node to determine that the sixth resource configuration information is effective, including: receiving fourth effectiveness indication information from the target host node, or establishing a connection with the first node; and configuring resources for the target cell according to the sixth resource configuration information. The sixth resource configuration information can be used for resource configuration of the target cell, the target cell is a cell served by the target parent node, the target parent node can be used by the first node to connect with the target host node, and the fourth effectiveness indication information is used to indicate that the sixth resource configuration information is effective.

[0557] In one possible design, the transceiver module 1501 is further configured to send a third activation indication message to the third node. This third activation indication message can be used to indicate that the eighth resource configuration information has taken effect.

[0558] In one possible design, the transceiver module 1501 is further configured to send a first effective indication message to the first node; wherein the first effective indication message can be used to indicate that the third resource configuration information is effective.

[0559] It should be noted that the transceiver module 1501 may include a receiving module and a sending module. The receiving module is used to receive data and / or signaling from the source host node, the second node, the first node, or the target host node; the sending module is used to send data and / or signaling to the source host node, the second node, the first node, or the target host node. This application does not specifically limit the specific implementation of the transceiver module.

[0560] Optionally, the communication device 1500 may also include a storage module. Figure 15 (Not shown in the image), this storage module stores programs or instructions. When the processing module executes the program or instructions, it enables the communication device 1500 to perform operations. Figure 8 or Figure 11 The function of the target parent node in the communication method shown.

[0561] It should be noted that the communication device 1500 can be Figure 3 The target parent node shown can also be a chip (system) or other component or part that can be set on the target parent node, and this application does not limit this.

[0562] In addition, the technical effects of the communication device 1500 can be referenced. Figure 8 or Figure 11 The technical effects of the communication method shown will not be elaborated here.

[0563] For example, Figure 16 This is a schematic diagram of the structure of the communication device provided in the embodiments of this application. Figure 2 .like Figure 16 As shown, the communication device 1600 includes a transmitting module 1601. For ease of explanation, Figure 16 Only the main components of the communication device are shown.

[0564] In one possible design, the communication device 1600 can be adapted to... Figure 3 In the communication system shown, the execution Figure 12 The function of the first node in the communication method shown.

[0565] The sending module 1601 is used to send first configuration activation information to the second node. The first configuration activation information indicates the activation of the first Internet Protocol (IP) address and / or the activation of the first Backhaul Adaptation Protocol (BAP) layer configuration information. The first IP address is used by the second node to communicate with the centralized unit (CU) of the source host node or the CU of the target host node through the distributed unit (DU) of the target host node. The first BAP layer configuration information is used by the second node to communicate with the CU of the source host node or the CU of the target host node.

[0566] In one possible design, the first BAP layer configuration information may include one or more of the following: a first BAP route identifier, the BAP address of the next-hop node of the second node, the identifier of the default backhaul BH Radio Link Control (RLC) channel on the first link, the identifier of the BH RLC channel on the first link corresponding to one or more F1 interface user plane tunnels, the identifier of the BH RLC channel on the first link corresponding to F1AP messages related to the terminal device (UE), the identifier of the BH RLC channel on the first link corresponding to non-UE related F1AP messages, or the identifier of the BH RLC channel on the first link corresponding to non-F1 interface non-F1 services. Wherein, the next-hop node of the second node is the next-hop node of the second node in uplink transmission, i.e., the parent node of the second node. Wherein, the first link is the link between the second node and its next-hop node.

[0567] In one possible design, the first configuration activation information can be carried in the Protocol Data Unit (PDU) of the BAP layer or the Data Link Layer Control Unit (MAC CE).

[0568] In one possible design, the first configuration activation information may include a first index value and / or a second index value, wherein the first index value is used to indicate at least one first IP address and the second index value is used to indicate at least one first BAP layer configuration information.

[0569] In one possible design, the first configuration activation information may include the identifier of the target host node.

[0570] Optionally, the communication device 1600 may further include a receiving module 1602, a processing module 1603, and a storage module. Figure 16 (Not shown in the image), the receiving module 1602 can be used to receive data and / or signaling from the target host node, source host node, or second node. The storage module stores programs or instructions. When the processing module 1603 executes the program or instruction, it enables the communication device 1600 to perform... Figure 12 The function of the first node in the communication method shown.

[0571] It should be noted that the communication device 1600 can be Figure 3 The first node shown can also be a chip (system) or other component or part that can be set on the first node, and this application does not limit this.

[0572] also, Figure 16 The technical effects of the communication device 1600 shown can be referenced. Figure 12 The technical effects of the communication method shown will not be elaborated here.

[0573] For example, Figure 17This is a schematic diagram of the structure of the communication device provided in the embodiments of this application. Figure 3 .like Figure 17 As shown, the communication device 1700 includes a receiving module 1701. For ease of explanation, Figure 17 Only the main components of the communication device are shown.

[0574] In one possible design, the communication device 1700 can be adapted to... Figure 3 In the communication system shown, the execution Figure 12 The function of the second node in the communication method shown.

[0575] The receiving module 1701 is used to receive first configuration activation information from the first node. The first configuration activation information indicates the activation of the first Internet Protocol (IP) address and / or the activation of the first Backhaul Adaptor (BAP) layer configuration information. The first IP address is used by the second node to communicate with the centralized unit (CU) of the source host node or the CU of the target host node through the distributed unit (DU) of the target host node. The first BAP layer configuration information is used by the second node to communicate with the CU of the source host node or the CU of the target host node.

[0576] In one possible design, the first BAP layer configuration information may include one or more of the following: a first BAP route identifier, the BAP address of the next-hop node of the second node, the identifier of the default backhaul BH Radio Link Control (RLC) channel on the first link, the identifier of the BH RLC channel on the first link corresponding to one or more F1 interface user plane tunnels, the identifier of the BH RLC channel on the first link corresponding to F1AP messages related to the terminal device (UE), the identifier of the BH RLC channel on the first link corresponding to non-UE related F1AP messages, or the identifier of the BH RLC channel on the first link corresponding to non-F1 interface non-F1 services. Wherein, the next-hop node of the second node is the next-hop node of the second node in uplink transmission, i.e., the parent node of the second node. Wherein, the first link is the link between the second node and its next-hop node.

[0577] In one possible design, the first configuration activation information can be carried in the Protocol Data Unit (PDU) of the BAP layer or the Data Link Layer Control Unit (MAC CE).

[0578] In one possible design, the first configuration activation information may include a first index value and / or a second index value, wherein the first index value is used to indicate at least one first IP address and the second index value is used to indicate at least one first BAP layer configuration information.

[0579] In one possible design, the first configuration activation information may include the identifier of the target host node.

[0580] Optionally, the communication device 1700 may further include a transmitting module 1702, a processing module 1703, and a storage module. Figure 17 (Not shown in the image), the sending module 1702 can be used to send data and / or signaling to a target host node, a source host node, or a first node. The storage module stores programs or instructions. When the processing module 1703 executes the program or instruction, it enables the communication device 1700 to perform... Figure 12 The function of the second node in the communication method shown.

[0581] It should be noted that the communication device 1700 can be Figure 3 The second node shown can also be a chip (system) or other component or part that can be set on the second node, and this application does not limit it in this regard.

[0582] also, Figure 17 The technical effects of the communication device 1700 shown can be referenced. Figure 12 The technical effects of the communication method shown will not be elaborated here.

[0583] For example, Figure 18 This is a schematic diagram of the structure of the communication device provided in the embodiments of this application. Figure 4 .like Figure 18 As shown, the communication device 1800 includes a transceiver module 1801 and a processing module 1802. For ease of explanation, Figure 18 Only the main components of the communication device are shown.

[0584] In one possible design, the communication device 1800 can be adapted to... Figure 3 In the communication system shown, the execution Figure 13 The function of the source host node in the communication method shown.

[0585] The processing module 1802 is used to determine whether the first condition is met. The transceiver module 1801 is used to send the first message to the second node.

[0586] The first condition includes: receiving a release message or a handover success message from the target host node; or receiving an indication from the first node's mobile terminal MT portion that it has successfully connected to the target host node; or determining that the control plane of the first node's F1 interface has been switched to the second Internet Protocol (IP) address.

[0587] Among them, the release message is used to instruct the source host node to release the MT part of the first node, the switch success message is used to indicate that the MT part of the first node has been successfully switched from connecting to the source host node to connecting to the target host node, and the second IP address is used for the first node to communicate with the centralized unit CU of the source host node through the DU of the target host node.

[0588] For example, the first message includes a first IP address and / or first backhaul adaptation protocol (BAP) layer configuration information. The first IP address is used for the second node to communicate with the source host node's CU or the target host node's CU through the target host node's DU. The first BAP layer configuration information is used for the second node to communicate with the source host node's CU or the target host node's CU.

[0589] In one possible design, the first BAP layer configuration information may include one or more of the following: a first BAP route identifier, the BAP address of the next-hop node of the second node, the identifier of the default backhaul BH Radio Link Control (RLC) channel on the first link, the identifier of the BH RLC channel on the first link corresponding to one or more F1 interface user plane tunnels, the identifier of the BH RLC channel on the first link corresponding to F1AP messages related to the terminal device (UE), the identifier of the BH RLC channel on the first link corresponding to non-UE related F1AP messages, or the identifier of the BH RLC channel on the first link corresponding to non-F1 interface non-F1 services. Wherein, the next-hop node of the second node is the next-hop node of the second node in uplink transmission, i.e., the parent node of the second node. Wherein, the first link is the link between the second node and its next-hop node.

[0590] It should be noted that the transceiver module 1801 may include a receiving module and a sending module. The receiving module is used to receive data and / or signaling from the second node, the first node, or the target host node; the sending module is used to send data and / or signaling to the second node, the first node, or the target host node. This application does not specifically limit the specific implementation of the transceiver module.

[0591] Optionally, the communication device 1800 may also include a storage module. Figure 18 (Not shown in the image), this storage module stores programs or instructions. When the processing module executes the program or instructions, it enables the communication device 1800 to perform operations. Figure 13 The function of the source host node in the communication method shown.

[0592] It should be noted that the communication device 1800 can be Figure 3 The source host node shown can also be a chip (system) or other component or part that can be set on the source host node, and this application does not limit this.

[0593] In addition, the technical effects of the communication device 1800 can be referenced. Figure 13 The technical effects of the communication method shown will not be elaborated here.

[0594] In one possible design, the communication device 1800 can be adapted to... Figure 3 In the communication system shown, the execution Figure 14 The function of the source host node in the communication method shown.

[0595] The transceiver module 1801 is used to receive a first Internet Protocol (IP) address and / or first Backhaul Adaptor Protocol (BAP) layer configuration information from the source host node. The transceiver module 1801 is also used to receive a first transmission instruction from the source host node. The processing module 1802 is used to control the transceiver module 1801 to send the first IP address and / or first BAP layer configuration information to the second node after the first node successfully establishes a connection with the target parent node.

[0596] The first IP address is used by the second node to communicate with the centralized unit (CU) of the source host node or the CU of the target host node through the distributed unit (DU) of the target host node. The first BAP layer configuration information is used by the second node to communicate with the CU of the source host node or the CU of the target host node. The first sending indication information is used to instruct the first node to send the first IP address and / or the first BAP layer configuration information to the second node after successfully establishing a connection with the target parent node.

[0597] In one possible design, the first BAP layer configuration information includes one or more of the following: a first BAP route identifier, the BAP address of the next-hop node of the second node, the identifier of the default backhaul BH Radio Link Control (RLC) channel on the first link, the identifier of the BH RLC channel on the first link corresponding to one or more F1 interface user plane tunnels, the identifier of the BH RLC channel on the first link corresponding to F1AP messages related to the terminal device (UE), the identifier of the BH RLC channel on the first link corresponding to non-UE related F1AP messages, or the identifier of the BH RLC channel on the first link corresponding to non-F1 interface non-F1 services. Wherein, the next-hop node of the second node is the next-hop node of the second node in uplink transmission, i.e., the parent node of the second node. Wherein, the first link is the link between the second node and its next-hop node.

[0598] It should be noted that the transceiver module 1801 may include a receiving module and a sending module. The receiving module is used to receive data and / or signaling from the second node, the source host node, or the target host node; the sending module is used to send data and / or signaling to the second node, the source host node, or the target host node. This application does not specifically limit the specific implementation of the transceiver module.

[0599] Optionally, the communication device 1800 may also include a storage module. Figure 18 (Not shown in the image), this storage module stores programs or instructions. When the processing module executes the program or instructions, it enables the communication device 1800 to perform operations. Figure 14 The function of the first node in the communication method shown.

[0600] It should be noted that the communication device 1800 can be Figure 3 The first node shown can also be a chip (system) or other component or part that can be set on the first node, and this application does not limit this.

[0601] In addition, the technical effects of the communication device 1800 can be referenced. Figure 14 The technical effects of the communication method shown will not be elaborated here.

[0602] Figure 19 A schematic diagram of the structure of a communication device 1900 that can be used to perform the communication method provided in the embodiments of this application. Figure 5 The communication device 1900 can be a source host node, a target host node, a first node, or a target parent node, such as... Figure 3 The source host node, target host node, first node, or target parent node in the system can also be a chip or other component that has the functions of a source host node, target host node, first node, or target parent node applied in the source host node, target host node, first node, or target parent node.

[0603] like Figure 19 As shown, the communication device 1900 may include a processor 1901 and a memory 1902. Optionally, the communication device 1900 may also include a transceiver 1903. The processor 1901 is coupled to the memory 1902 and the transceiver 1903, for example, they can be connected via a communication bus.

[0604] The following is combined with Figure 19 A detailed description of each component of the communication device 1900 is provided below:

[0605] Processor 1901 is the control center of communication device 1900. It can be a single processor or a collective term for multiple processing elements. For example, processor 1901 can be one or more central processing units (CPUs), application-specific integrated circuits (ASICs), or one or more integrated circuits configured to implement the embodiments of this application, such as one or more digital signal processors (DSPs), or one or more field-programmable gate arrays (FPGAs).

[0606] The processor 1901 can perform various functions of the communication device 1900 by running or executing software programs stored in the memory 1902 and calling data stored in the memory 1902.

[0607] In a specific implementation, as one example, the processor 1901 may include one or more CPUs, for example... Figure 19 CPU0 and CPU1 are shown in the diagram.

[0608] In a specific implementation, as one example, the communication device 1900 may also include multiple processors, for example... Figure 19 The processors 1901 and 1904 are shown. Each of these processors can be a single-core processor or a multi-core processor. Here, "processor" can refer to one or more communication devices, circuits, and / or processing cores used to process data (e.g., computer program instructions).

[0609] Memory 1902 may be a read-only memory (ROM) or other type of static storage communication device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage communication device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage communication devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto. Memory 1902 may be integrated with processor 1901 or exist independently, and may be connected via the input / output port of communication device 1900. Figure 19 (Not shown in the image) is coupled to processor 1901, and this embodiment of the application does not specifically limit this.

[0610] The memory 1902 stores the software program that executes the solution of this application, and its execution is controlled by the processor 1901. Specific implementation methods described above can be found in the following method embodiments, which will not be repeated here.

[0611] Transceiver 1903 is used for communication with other communication devices. For example, if communication device 1900 is a communication device, transceiver 1903 can be used to communicate with a first network device. As another example, if communication device 1900 is a first network device, transceiver 1903 can be used to communicate with the communication device or with a second network device. Yet another example, if communication device 1900 is a second network device, transceiver 1903 can be used to communicate with the first network device. Furthermore, transceiver 1903 may include a receiver and a transmitter. Figure 19 (Not shown separately). The receiver is used to implement the receiving function, and the transmitter is used to implement the transmitting function. The transceiver 1903 can be integrated with the processor 1901 or exist independently, and is connected via the input / output port of the communication device 1900 (…). Figure 19 (Not shown in the image) is coupled to processor 1901, and this embodiment of the application does not specifically limit this.

[0612] It should be noted that, Figure 19The structure of the communication device 1900 shown does not constitute a limitation on the communication device. Actual communication devices may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0613] This application provides a communication system. The system includes a source host node and a first node, a target host node, or the system includes a target host node and a target parent node, a source host node, or the system includes a source host node and one or more second nodes, or the system includes a first node and one or more second nodes, or the system includes a source host node, a first node, a target host node and a target parent node, or the system includes a source host node, a first node, a target host node, a target parent node and a second node.

[0614] This application provides a chip system including a processor and input / output ports. The processor is used to implement the processing functions involved in the communication method provided in this application, and the input / output ports are used for the transmission and reception functions involved in the communication method provided in this application.

[0615] In one possible design, the chip system further includes a memory for storing program instructions and data that implement the functions involved in the communication methods provided in the embodiments of this application.

[0616] This chip system can consist of chips or include chips and other discrete components.

[0617] This application provides a computer-readable storage medium that includes a computer program or instructions that, when executed on a computer, cause the computer to perform the communication method provided in this application.

[0618] This application provides a computer program product, which includes a computer program or instructions that, when executed on a computer, cause the computer to perform the communication method provided in this application.

[0619] It should be understood that the processor in the embodiments of this application can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0620] It should also be understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous DRAM (DDR SDRAM), enhanced synchronous DRAM (ESDRAM), synchronous linked DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0621] The above embodiments can be implemented, in whole or in part, by software, hardware (such as circuits), firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a target host node, a source host node, a first node, a target parent node, a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more sets of available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. A semiconductor medium can be a solid-state drive.

[0622] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. Additionally, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects, but it can also represent an "and / or" relationship. Please refer to the context for a more accurate understanding.

[0623] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0624] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0625] Those skilled in the art will recognize that the units or modules and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0626] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, units, or modules described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0627] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units or modules described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or modules may be combined or integrated into another system, or some units or modules may be omitted, or their corresponding functions may not be executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between devices or units / modules, and may be electrical, mechanical, or other forms.

[0628] The units / modules described as separate components may or may not be physically separate. The components shown as units / modules may or may not be physical units / modules; that is, they may be located in one place or distributed across multiple network units / modules. Some or all of the units / modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0629] In addition, the functional units / modules in the various embodiments of this application can be integrated into one processing unit / module, or each unit / module can exist physically separately, or two or more units / modules can be integrated into one unit / module.

[0630] If the aforementioned functions are implemented as software functional units / modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0631] In the embodiments of this application, provided there is no logical contradiction, the embodiments may reference each other. For example, the methods and / or terms between method embodiments may reference each other, the functions and / or terms between device embodiments may reference each other, and the functions and / or terms between device embodiments and method embodiments may reference each other.

[0632] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A communication method, characterized in that, include: The system receives one or more of the following from a target host node: first resource configuration information, sixth resource configuration information, or first information; wherein the first resource configuration information includes the current resource configuration information of the target cell, the sixth resource configuration information includes the resource reconfiguration information of the target cell, the target cell is a cell served by a target parent node, and the target parent node is used for the first node to connect with the target host node; the first information includes the resource configuration information of a first cell determined by the target host node, and the first cell is a cell served by the first node. Determining the third resource configuration information includes: determining the third resource configuration information based on the first resource configuration information, or determining the third resource configuration information based on the sixth resource configuration information and / or the first information; wherein the third resource configuration information is used for resource configuration of the first cell; Send the third resource configuration information to the first node.

2. The communication method according to claim 1, characterized in that, Determining the third resource configuration information based on the first resource configuration information includes: The third resource configuration information is determined based on the first resource configuration information and the second resource configuration information; wherein, the second resource configuration information includes the current resource configuration information of the first cell.

3. The communication method according to claim 1, characterized in that, Determining the third resource configuration information based on the sixth resource configuration information and / or the first information includes: The third resource configuration information is determined based on the sixth resource configuration information and / or the first information, as well as the second resource configuration information; wherein the second resource configuration information includes the current resource configuration information of the first cell.

4. The communication method according to any one of claims 1-3, characterized in that, The method further includes: Based on the second resource configuration information, the second information is determined; wherein, the second resource configuration information includes the current resource configuration information of the first cell, and the second information includes the resource configuration information of the target cell determined by the source host node.

5. The communication method according to any one of claims 1-3, characterized in that, The method further includes: Based on the second resource configuration information and the first resource configuration information, the second information is determined; wherein, the second resource configuration information includes the current resource configuration information of the first cell, and the second information includes the resource configuration information of the target cell determined by the source host node.

6. The communication method according to claim 4, characterized in that, The method further includes: The second information is sent to the target host node.

7. The communication method according to any one of claims 1-3 and 6, characterized in that, The method further includes: Based on the third resource configuration information and / or the first resource configuration information, fifth resource configuration information is determined; wherein, the fifth resource configuration information includes resource reconfiguration information of the second cell, the second cell being a cell served by the second node, and the second node being connected to the source host node via the first node.

8. The communication method according to any one of claims 1-3 and 6, characterized in that, The method further includes: Based on the third resource configuration information and / or the first resource configuration information and the fourth resource configuration information, the fifth resource configuration information is determined; wherein, the fourth resource configuration information includes the current resource configuration information of the second cell, the second cell is a cell served by the second node, the second node is connected to the source host node via the first node, and the fifth resource configuration information includes the resource reconfiguration information of the second cell.

9. The communication method according to any one of claims 1-3 and 6, characterized in that, The method further includes: The fifth resource configuration information is determined based on one or more of the sixth resource configuration information, the first information, and the third resource configuration information; wherein the fifth resource configuration information includes resource reconfiguration information of the second cell, the second cell being a cell served by the second node, and the second node being connected to the source host node via the first node.

10. The communication method according to any one of claims 1-3 and 6, characterized in that, The method further includes: The fifth resource configuration information is determined based on one or more of the sixth resource configuration information, the first information, and the third resource configuration information, as well as the fourth resource configuration information; wherein the fourth resource configuration information includes the current resource configuration information of the second cell, the fifth resource configuration information includes the resource reconfiguration information of the second cell, the second cell is a cell served by the second node, and the second node is connected to the source host node via the first node.

11. The communication method according to claim 7, characterized in that, The method further includes: Send the fifth resource configuration information to the second node.

12. The communication method according to claim 11, characterized in that, The method further includes: Send a second activation indication message to the second node; wherein the second activation indication message is used to indicate that the fifth resource configuration information takes effect.

13. The communication method according to any one of claims 1-3, 6, and 11, characterized in that, The method further includes: Send the third resource configuration information to the target host node.

14. The communication method according to any one of claims 1-3, 6, and 11-12, characterized in that, The method further includes: Send a first request message to the target host node; wherein the first request message is used to request that the host node of the first node be switched from the source host node to the target host node, or to request that the target host node be used as an auxiliary station of the first node.

15. The communication method according to claim 14, characterized in that, The first request message includes one or more of the following: first indication information, the identifier of the target cell, or second resource configuration information, wherein the first indication information is used to indicate that the first node is an integrated access backhaul (IAB) node, and the second resource configuration information includes the current resource configuration information of the first cell.

16. The communication method according to claim 15, characterized in that, The method further includes: Receive a first response message from the target host node; wherein the first response message is used to confirm switching the host node of the first node from the source host node to the target host node, or to confirm using the target host node as an auxiliary station of the first node.

17. The communication method according to claim 16, characterized in that, The first response message includes one or more of the following: the first resource configuration information, the sixth resource configuration information, or the first information.

18. The communication method according to any one of claims 1-3, 6, 11-12, and 16-17, characterized in that, The method further includes: Send a second indication message to the target host node; wherein the second indication message is used to indicate whether the source host node should use the first information as the resource reconfiguration information of the first cell.

19. The communication method according to claim 6, characterized in that, The method further includes: Receive third indication information from the target host node; wherein the third indication information is used to instruct the target host node whether to use the second information as resource reconfiguration information for the target cell.

20. The communication method according to any one of claims 16-17, characterized in that, The method further includes: Send a first effective indication message to the first node; wherein the first effective indication message is used to indicate that the third resource configuration information is effective.

21. A communication method, characterized in that, include: Receive one or more of the following from the source host node: second resource configuration information, third resource configuration information, or second information; wherein, the second resource configuration information includes the current resource configuration information of the first cell, the third resource configuration information includes the resource reconfiguration information of the first cell, the first cell is a cell served by the first node, the second information includes the resource configuration information of the target cell determined by the source host node, the target cell is a cell served by the target parent node, and the target parent node is used for the first node to connect with the target host node; Determining the sixth resource configuration information includes: determining the sixth resource configuration information based on the second resource configuration information; or, determining the sixth resource configuration information based on the third resource configuration information and / or the second information; wherein the sixth resource configuration information is used for resource configuration of the target cell; Send the sixth resource configuration information to the target parent node.

22. The communication method according to claim 21, characterized in that, The step of determining the sixth resource configuration information based on the second resource configuration information includes: The sixth resource configuration information is determined based on the second resource configuration information and the first resource configuration information; wherein the first resource configuration information includes the current resource configuration information of the target cell.

23. The communication method according to claim 21, characterized in that, Determining the sixth resource configuration information based on the third resource configuration information and / or the second information includes: The sixth resource configuration information is determined based on the third resource configuration information and / or the second information, as well as the first resource configuration information; wherein the first resource configuration information includes the current resource configuration information of the target cell.

24. The communication method according to any one of claims 21-23, characterized in that, The method further includes: Based on the first resource configuration information, first information is determined; wherein, the first resource configuration information includes the current resource configuration information of the target cell, and the first information includes the resource configuration information of the first cell determined by the target host node.

25. The communication method according to any one of claims 21-23, characterized in that, The method further includes: Based on the first resource configuration information and the second resource configuration information, first information is determined; wherein, the first resource configuration information includes the current resource configuration information of the target cell, and the first information includes the resource configuration information of the first cell determined by the target host node.

26. The communication method according to claim 24, characterized in that, The method further includes: The first information is sent to the source host node.

27. The communication method according to any one of claims 21-23 and 26, characterized in that, The method further includes: Based on the second resource configuration information and / or the sixth resource configuration information, the eighth resource configuration information is determined; wherein, the eighth resource configuration information includes the resource reconfiguration information of the third cell, the third cell being a cell served by the third node, and the third node being connected to the target host node via the target parent node.

28. The communication method according to any one of claims 21-23 and 26, characterized in that, The method further includes: Based on the second resource configuration information and / or the sixth resource configuration information and the seventh resource configuration information, the eighth resource configuration information is determined; wherein, the seventh resource configuration information includes the current resource configuration information of the third cell, the third cell is a cell served by the third node, the third node is connected to the target host node via the target parent node, and the eighth resource configuration information includes the resource reconfiguration information of the third cell.

29. The communication method according to any one of claims 21-23 and 26, characterized in that, The method further includes: Based on one or more of the third resource configuration information, the second information, and the sixth resource configuration information, the eighth resource configuration information is determined; wherein, the eighth resource configuration information includes resource reconfiguration information of the third cell, the third cell being a cell served by the third node, and the third node being connected to the target host node via the target parent node.

30. The communication method according to any one of claims 21-23 and 26, characterized in that, The method further includes: Based on one or more of the third resource configuration information, the second information, and the sixth resource configuration information, and the seventh resource configuration information, the eighth resource configuration information is determined; wherein, the seventh resource configuration information includes the current resource configuration information of the third cell, the eighth resource configuration information includes the resource reconfiguration information of the third cell, the third cell is a cell served by the third node, and the third node is connected to the target host node via the target parent node.

31. The communication method according to claim 27, characterized in that, The method further includes: Send the eighth resource configuration information to the third node.

32. The communication method according to any one of claims 21-23, 26, and 31, characterized in that, The method further includes: The sixth resource configuration information is sent to the source host node.

33. The communication method according to any one of claims 21-23 and 26, characterized in that, The method further includes: Receive a first request message from the source host node; wherein the first request message is used to request that the host node of the first node be switched from the source host node to the target host node, or to request that the target host node be used as an auxiliary station of the first node.

34. The communication method according to claim 33, characterized in that, The first request message includes one or more of the following: first indication information, the identifier of the target cell, or second resource configuration information, wherein the first indication information is used to indicate that the first node is an integrated access backhaul (IAB) node, and the second resource configuration information includes the current resource configuration information of the first cell.

35. The communication method according to claim 34, characterized in that, The method further includes: Send a first response message to the source host node; wherein the first response message is used to confirm switching the host node of the first node from the source host node to the target host node, or to confirm that the target host node is used as an auxiliary station of the first node.

36. The communication method according to claim 35, characterized in that, The first response message includes one or more of the following: the first resource configuration information, the sixth resource configuration information, or the first information.

37. The communication method according to any one of claims 21-23, 26, and 35-36, characterized in that, The method further includes: Receive second indication information from the source host node; wherein the second indication information is used to indicate whether the source host node should use the first information as resource reconfiguration information for the first cell.

38. The communication method according to any one of claims 21-23, 26, and 35-36, characterized in that, The method further includes: Send a third indication message to the source host node; wherein the third indication message is used to instruct the target host node whether to use the second information as the resource reconfiguration information of the target cell.

39. The communication method according to any one of claims 21-23, 26, and 35-36, characterized in that, The method further includes: Send a first effective indication message to the first node; wherein the first effective indication message is used to indicate that the third resource configuration information is effective.

40. The communication method according to claim 27, characterized in that, The method further includes: Send a third effective indication message to the third node; wherein the third effective indication message is used to indicate that the eighth resource configuration information takes effect.

41. The communication method according to any one of claims 21-23, 26, 35-36, and 40, characterized in that, The method further includes: Send a fourth activation indication message to the target parent node; wherein the fourth activation indication message is used to indicate that the sixth resource configuration information takes effect.

42. A communication method, characterized in that, include: The system receives third resource configuration information from a source host node; wherein the third resource configuration information is used for resource configuration of a first cell, the first cell being a cell served by a first node; the third resource configuration information is determined based on first resource configuration information, or the third resource configuration information is determined based on sixth resource configuration information and / or first information; the first resource configuration information includes the current resource configuration information of the target cell, the sixth resource configuration information includes the resource reconfiguration information of the target cell, the target cell being a cell served by a target parent node, the target parent node being used for connection between the first node and the target host node; the first information includes the resource configuration information of the first cell determined by the target host node; Determining that the third resource configuration information is effective includes: receiving first effectiveness indication information from the source host node, target host node, or target parent node, or establishing a connection with the target parent node; wherein, the first effectiveness indication information is used to indicate that the third resource configuration information is effective; The first cell is configured with resources based on the third resource configuration information.

43. The communication method according to claim 42, characterized in that, The method further includes: Send a second effective indication message to the second node; wherein the second effective indication message is used to indicate that the fifth resource configuration information takes effect.

44. A communication method, characterized in that, include: The system receives sixth resource configuration information from a target host node; wherein the sixth resource configuration information is used for resource configuration of a target cell, the target cell is a cell served by a target parent node, and the target parent node is used for the first node to connect with the target host node; the sixth resource configuration information is determined based on second resource configuration information, or the sixth resource configuration information is determined based on third resource configuration information and / or second information, the second resource configuration information includes the current resource configuration information of the first cell, the third resource configuration information includes the resource reconfiguration information of the first cell, the first cell is a cell served by the first node, and the second information includes the resource configuration information of the target cell determined by the source host node; Determining that the sixth resource configuration information is effective includes: receiving a fourth effectiveness indication message from the target host node, or establishing a connection with the first node; wherein the fourth effectiveness indication message is used to indicate that the sixth resource configuration information is effective; Resource allocation is performed on the target cell based on the sixth resource allocation information.

45. The communication method according to claim 44, characterized in that, The method further includes: Send a third effective indication message to the third node; wherein the third effective indication message is used to indicate that the eighth resource configuration information is effective.

46. ​​The communication method according to claim 44 or 45, characterized in that, The method further includes: Send a first effective indication message to the first node; wherein the first effective indication message is used to indicate that the third resource configuration information is effective.

47. A communication device, characterized in that, Includes units or modules for performing the method as described in any one of claims 1 to 20.

48. A communication device, characterized in that, Includes units or modules for performing the method as described in any one of claims 21 to 41.

49. A communication device, characterized in that, Includes units or modules for performing the method as described in any one of claims 42 to 43.

50. A communication device, characterized in that, Includes units or modules for performing the method as described in any one of claims 44 to 46.

51. A communication device, characterized in that, The communication device includes: a processor coupled to a memory; The memory is used to store computer programs; The processor is configured to execute the computer program stored in the memory, so that the communication device performs the communication method as described in any one of claims 1-46.

52. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a computer program or instructions that, when executed on a computer, cause the computer to perform the communication method as described in any one of claims 1-46.

53. A computer program product, characterized in that, The computer program product includes: a computer program or instructions that, when executed on a computer, cause the computer to perform the communication method as described in any one of claims 1-46.

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