CN114390601B

CN114390601B - Control signaling transmission method, device, IAB node, source host and target host

Info

Publication number: CN114390601B
Application number: CN202011109570.6A
Authority: CN
Inventors: 刘子乔; 王达
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2023-08-29
Anticipated expiration: 2040-10-16
Also published as: CN114390601A

Abstract

The application discloses a control signaling transmission method, a control signaling transmission device, an IAB node, a target host, a source host and a storage medium, and relates to the technical field of communication. The specific implementation scheme is as follows: the IAB node transmits control signaling with the target host by acquiring information of a default channel and a default route between the target host and the IAB node and then adopting the default channel and the default route. Therefore, in the process of switching the IAB node from the source host to the target host, the transmission control signaling can be realized through the default channel and the default route, and the upper IAB node does not need to be migrated, so that the time delay of message transmission is reduced.

Description

Control signaling transmission method, device, IAB node, source host and target host

Technical Field

The present application relates to the field of communications technologies, and in particular, to a control signaling transmission method, a device, an IAB node, a source host, and a target host.

Background

With the development of the integrated access backhaul (IntegratedAccess and Backhaul, IAB) technology, there is a higher requirement on the migration of an IAB node, where in the related art, in order to switch an IAB node and a node thereof from a source host to a target host, a layer-by-layer migration manner is required for the IAB node and a child node thereof.

By the migration mode, all levels of sub-nodes of the IAB node need to wait for the IAB node at the upper layer to complete migration, and then control signaling can be transmitted, so that the delay of the control signaling transmission is larger.

Disclosure of Invention

The application provides a control signaling transmission method, an access backhaul integrated IAB node, a target host, a source host, a device and a storage medium.

According to an aspect of the present application, there is provided a control signaling transmission method, the method being applied to an access backhaul integrated IAB node, the method comprising: acquiring information of a default channel and a default route between a target host and the IAB node; the target host is a host to which the IAB node is to be switched; transmitting control signaling with the target host by adopting the default channel and the default route; wherein the control signaling includes at least one of a radio resource control, RRC, reconfiguration complete message, F1 connection setup request, and F1 connection setup response message.

Optionally, the obtaining information of a default channel and a default route between the target host and the IAB node includes:

receiving a first RRC reconfiguration message; the first RRC reconfiguration message carries information of a default channel and a default route between the target host and the IAB node.

Optionally, said transmitting control signaling with said target host using said default channel and said default route comprises:

and under the condition that the IAB node is reconfigured, adopting the default channel and the default route to send a first RRC reconfiguration completion message to the target host.

Optionally, after the sending the first RRC reconfiguration complete message to the target host using the default channel and the default route, the method further includes:

transmitting an F1 connection establishment request message to the target host by adopting the default channel and the default route; the F1 connection establishment request is used for requesting to establish F1 connection between the IAB node and the target host;

and receiving an F1 connection establishment response message sent by the target host by adopting the default channel and the default route.

Optionally, the IAB node is a parent node of the UE, and before receiving the first RRC reconfiguration message, the method further includes:

receiving a second RRC reconfiguration message through an F1 connection with the source host; the second RRC reconfiguration message carries a configuration parameter used to reconfigure the UE; the source host is the host before the IAB node is switched;

Sending the second RRC reconfiguration message to the UE through a Uu interface between the IAB node and the UE;

receiving a second RRC reconfiguration complete message sent under the condition that the UE reconfiguration is completed;

after receiving the first RRC reconfiguration message, the method further includes:

and transmitting the second RRC reconfiguration complete message to the target host by adopting a default channel and the default route between the target host and the IAB node.

Optionally, the receiving the first RRC reconfiguration message includes:

receiving the first RRC reconfiguration message sent by a source host, wherein the first RRC reconfiguration message is carried in a switching response sent by the target host to the source host; the source host is the host prior to the IAB node handoff.

Optionally, the receiving the first RRC reconfiguration message includes:

and receiving the first RRC reconfiguration message sent by the parent node of the IAB, wherein the first RRC reconfiguration message is sent to the parent node by the target host through a default channel and a default route between the target host and the parent node.

Optionally, the parent node of the IAB is a top-level migration node switched to the target host; the default channel and default route between the target host and the parent node are carried in a third RRC reconfiguration message sent by the source host, where the third reconfiguration message is carried in a handover response sent by the target host to the source host; the source host is the host prior to the IAB node handoff.

Optionally, after receiving the first RRC reconfiguration message, the method further includes:

receiving a fourth RRC reconfiguration message sent by the target host through a default channel and a default route between the target host and the IAB node; the fourth RRC reconfiguration message carries a default channel and a default route between a next-hop communications node of the IAB node and the target host, where the next-hop communications node is UE or a sub-IAB node of the IAB node;

and sending the fourth RRC reconfiguration message to the next hop communication node.

Optionally, the default channel is a default backhaul radio link control channel; the default route is a default backhaul adaptation protocol route identification.

According to another aspect of the present application, there is provided a control signaling transmission method, the method being applied to a target host, the method comprising:

transmitting information of a default channel and a default route between the target host and a first access backhaul integrated IAB node; wherein the first IAB node is to be handed over from a source host to the target host; transmitting control signaling with the first IAB node by adopting the default channel and the default route; wherein the control signaling includes at least one of a radio resource control, RRC, reconfiguration complete message, F1 connection setup request, and F1 connection setup response message.

Optionally, the sending the information of the default channel and the default route between the target host and the first IAB node includes:

transmitting a switching response to the source host, wherein the switching response carries a first RRC reconfiguration message and is used for indicating the source host to transmit the first RRC reconfiguration message to the first IAB node; the first RRC reconfiguration message carries information of a default channel and a default route between the target host and the first IAB node.

Optionally, the transmitting control signaling with the first IAB node using the default channel and the default route includes:

and receiving a first RRC reconfiguration complete message of the first IAB node by adopting the default channel and the default route between the target host and the first IAB node.

Optionally, the switching response further carries a second RRC reconfiguration message of the terminal UE, where the second RRC reconfiguration message carries a configuration parameter used for reconfiguring the UE;

after the switching response is sent to the source host, the method further comprises the following steps:

and receiving a second RRC reconfiguration complete message sent by the parent node by adopting the default channel and the default route between the target host and the first IAB node serving as the UE parent node, wherein the second RRC reconfiguration complete message is used for representing the completion of UE reconfiguration.

Optionally, sending information of a default channel and a default route between the target host and the first access backhaul integrated IAB node includes:

transmitting the first RRC reconfiguration message to a second IAB node by adopting a default channel and a default route between the target host and the second IAB node so as to transmit the first RRC reconfiguration message to the first IAB node through the second IAB node; wherein the second IAB node is a parent node of the first IAB node.

Optionally, before the sending the first RRC reconfiguration message to the second IAB node, the default channel and default route between the target host and the second IAB node are adopted, the method further includes:

and sending a third RRC reconfiguration message to the second IAB node through the source host, wherein the third RRC reconfiguration message carries a default channel and a default route between the target host and the second IAB node.

Optionally, after receiving the first RRC reconfiguration complete message of the first IAB node, the receiving further includes:

Receiving an F1 connection establishment request message sent by the first IAB node by adopting the default channel and the default route;

establishing an F1 connection between the first IAB node and the target host;

and adopting the default channel and the default route to send an F1 connection establishment response message to the first IAB node.

According to another aspect of the present application, there is provided a control signaling transmission method, wherein the method is applied to a source host, the method comprising: acquiring a first RRC reconfiguration message sent by a target host, wherein the first RRC reconfiguration message carries configuration parameters for reconfiguring a first IAB node, and information of a default channel and a default route between the target host and the first IAB node; the first IAB node is to be switched from a source host to the target host; transmitting the first RRC reconfiguration message to the first IAB node; the first RRC reconfiguration message is configured to instruct the first IAB node to reconfigure according to the configuration parameter, and send a first RRC reconfiguration complete message to the target host by adopting a default channel and a default route between the target host and the first IAB node.

Optionally, the acquiring the first RRC reconfiguration message sent by the target host includes:

sending a switching request to the target host;

and receiving a transmitted switching response of the target host, wherein the switching response carries the first RRC reconfiguration message.

Optionally, the handover request further carries a second RRC reconfiguration message of the terminal UE, where the second RRC reconfiguration message carries a configuration parameter used for reconfiguring the UE;

after receiving the sent switching response of the target host, the method further comprises:

sending the second RRC reconfiguration message to a parent node of the UE through an F1 connection with the parent node; the second RRC reconfiguration message is configured to instruct the UE to reconfigure, and send a second RRC reconfiguration complete message to the parent node after the configuration is completed, so that the parent node adopts a default channel and a default route with the target host, and sends the second RRC reconfiguration complete message to the target host.

Optionally, the first IAB node is plural, and the sending the first RRC reconfiguration message to the first IAB node includes:

Transmitting the first RRC reconfiguration message to each of the first IAB nodes in parallel;

or sending the first RRC reconfiguration message to each of the first IAB nodes according to a set order.

According to another aspect of the present application, there is provided an access backhaul integrated IAB node, wherein the IAB node includes a memory, a transceiver, and a processor: a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations: acquiring information of a default channel and a default route between the target host and the IAB node; transmitting control signaling with the target host by adopting the default channel and the default route; wherein the control signaling includes at least one of a radio resource control, RRC, reconfiguration complete message, F1 connection setup request, and F1 connection setup response message.

receiving a second RRC reconfiguration message through an F1 connection with the source host; the second RRC reconfiguration message carries a configuration parameter used to reconfigure the UE; the source host is the host before the IAB node is switched; the method comprises the steps of carrying out a first treatment on the surface of the

Optionally, the receiving the first RRC reconfiguration message includes:

According to another aspect of the present application, there is provided a target host comprising a memory, a transceiver, and a processor: a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

and sending a switching response to the source host, wherein the switching response carries a first RRC reconfiguration message, and the switching response is used for indicating the source host to send the first RRC reconfiguration message to the first IAB node, and the first RRC reconfiguration message carries information of a default channel and a default route between the target host and the first IAB node.

According to another aspect of the present application, there is provided a source host comprising a memory, a transceiver, and a processor: a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations: acquiring a first RRC reconfiguration message sent by a target host, wherein the first RRC reconfiguration message carries configuration parameters for reconfiguring a first IAB node, and information of a default channel and a default route between the target host and the first IAB node; the first IAB node is to be switched from a source host to the target host; transmitting the first RRC reconfiguration message to the first IAB node; the first RRC reconfiguration message is configured to instruct the first IAB node to reconfigure according to the configuration parameter, and send a first RRC reconfiguration complete message to the target host by adopting a default channel and a default route between the target host and the first IAB node.

sending a switching request to the target host;

According to another aspect of the present application, there is provided a control signaling transmission apparatus applied to an access backhaul integrated IAB node, the apparatus comprising:

An information obtaining unit, configured to obtain information of a default channel and a default route between a target host and the IAB node; the target host is a host to which the IAB node is to be switched; a first transmission instruction unit, configured to transmit control signaling with the target host by using the default channel and the default route; wherein the control signaling includes at least one of a radio resource control, RRC, reconfiguration complete message, F1 connection setup request, and F1 connection setup response message.

According to another aspect of the present application, there is provided a control signaling transmission apparatus, the apparatus being applied to a target host, the apparatus comprising:

a sending information unit, configured to send information of a default channel and a default route between the target host and the first access backhaul integrated IAB node; wherein the first IAB node is to be handed over from a source host to the target host; a second transmission instruction unit, configured to transmit control signaling with the first IAB node by using the default channel and the default route; wherein the control signaling includes at least one of a radio resource control, RRC, reconfiguration complete message, F1 connection setup request, and F1 connection setup response message.

According to another aspect of the present application, there is provided a control signaling transmission apparatus, the apparatus being applied to a source host, the apparatus comprising: a first obtaining unit, configured to obtain a first RRC reconfiguration message sent by a target host, where the first RRC reconfiguration message carries configuration parameters for reconfiguring a first IAB node, and information of a default channel and a default route between the target host and the first IAB node; the first IAB node is to be switched from a source host to the target host; a third sending unit, configured to send the first RRC reconfiguration message to the first IAB node; the first RRC reconfiguration message is configured to instruct the first IAB node to reconfigure according to the configuration parameter, and send a first RRC reconfiguration complete message to the target host by adopting a default channel and a default route between the target host and the first IAB node.

According to another aspect of the present application, there is provided a processor readable storage medium storing a computer program for causing the processor to perform a control signaling method for accessing a backhaul integrated IAB node, or to perform a control signaling method for a target host, or to perform a control signaling method for a source host.

The application has the following technical effects:

the IAB node transmits control signaling with the target host by acquiring information of a default channel and a default route between the target host and the IAB node and then adopting the default channel and the default route. Therefore, in the process of switching the IAB node from the source host to the target host, the transmission control signaling can be sent through the default channel and the default route, and the upper IAB node does not need to be migrated, so that the time delay of message sending is reduced.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the application or to delineate the scope of the application. Other features of the present application will become apparent from the description that follows.

Drawings

The drawings are included to provide a better understanding of the present application and are not to be construed as limiting the application. Wherein:

fig. 1 is a schematic diagram of an IAB network structure according to an embodiment of the present application;

fig. 2 is a schematic diagram of an IAB node in the prior art switching from a source host to a target host according to an embodiment of the present application;

fig. 3 is a flow chart of a control signaling transmission method according to an embodiment of the present application;

fig. 4 is a flowchart of a control signaling transmission method according to an embodiment of the present application;

Fig. 5 is a flowchart of a control signaling transmission method according to a specific embodiment provided in an embodiment of the present application;

fig. 6 is a flowchart of another control signaling transmission method according to an embodiment of the present application;

fig. 7 is a flowchart of another control signaling transmission method according to an embodiment of the present application;

fig. 8 is a flowchart of a control signaling transmission method according to another embodiment of the present application;

fig. 9 is a flowchart of a control signaling transmission method according to another embodiment of the present application;

fig. 10 is a flowchart of a control signaling transmission method according to another embodiment of the present application;

fig. 11 is a schematic structural diagram of an access backhaul integrated IAB node according to an embodiment of the present application;

FIG. 12 is a schematic diagram of a target host provided in accordance with an embodiment of the present application;

FIG. 13 is a schematic diagram of a source host provided in accordance with an embodiment of the present application;

fig. 14 is a schematic structural diagram of a control signaling transmission device according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of a control signaling transmission device according to an embodiment of the present application;

Fig. 16 is a schematic structural diagram of a control signaling transmission device according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

That is, in the embodiment of the present application, the term "and/or" describes the association relationship of the association objects, which means that three relationships may exist, for example, a and/or B may be represented: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

In the related art, as shown in fig. 1, an IAB network is composed of an IAB host (node) and a User Equipment (UE). The IAB host comprises two parts, an IAB host centralized unit (IAB donor Centralized Unit, iabdonor CU) and an IAB host distributed unit DU (IAB donor Distributed Unit, IAB donor DU), wherein there may be multiple IAB donor DUs under one IAB donor CU. The IAB node is composed of two parts, an IAB distributed unit (IAB Distributed Unit, IAB node DU) and an IAB mobile terminal (IAB Mobile Termination, IAB node MT). Wherein, the IAB node DU part is connected to the IAB donor CU through the F1 interface, and the IAB node MT part is connected to the IAB node DU of the next layer through the Uu interface. If the IAB node is connected to the UE at the next layer, the DU part of the IAB node is connected to the UE.

In the process of switching the IAB node from the source host to the target host, as shown in fig. 2, for example, IAB node 5 is a migration node, IAB node 6 below the migration node is a child node, IAB node 7 is a grandchild node, and UE is connected below IAB node 7, and in the process of switching from the source host to the target host, the offspring node and UE of the migration node are switched to the target host layer by layer.

However, by switching to the target host layer by layer, the descendant node of the migration node needs to wait for the IAB node at the upper layer to complete migration, so that the transmission control signaling can be sent, and the time delay of message sending is larger.

The terminal provided in the foregoing embodiments may be a terminal device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or another processing device connected to a wireless modem, and so on. The names of the terminal devices may also be different in different systems, for example in a 5G system, the terminal devices may be referred to as User Equipment (UE). The wireless terminal device may communicate with one or more Core Networks (CNs) via a radio access Network (Radio Access Network, RAN), which may be mobile terminal devices such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, e.g., portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange voice and/or data with the radio access Network. Such as personal communication services (Personal Communication Service, PCS) phones, cordless phones, session initiation protocol (Session Initiated Protocol, SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal Digital Assistant, PDAs), and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile), remote station (remote station), access point (access point), remote terminal device (remote terminal), access terminal device (access terminal), user terminal device (user terminal), user agent (user agent), user equipment (user device), and embodiments of the present application are not limited in this respect.

In order to solve the above problems, an embodiment of the present application provides a control signaling transmission method, an IAB node, a target host, a source host, a device and a storage medium, where the IAB node transmits control signaling with the target host by acquiring information of a default channel and a default route between the target host and the IAB node, and then adopting the default channel and the default route. Therefore, in the process of switching the IAB node from the source host to the target host, the transmission control signaling can be sent through the default channel and the default route, and the completion of the migration of the IAB node at the upper layer is not required to be waited, so that the time delay of the message sending is reduced, and the technical problem that the time delay of the message sending is larger because the IAB node can send the transmission control signaling only after the IAB node at the upper layer is waited to be completed is avoided.

The control signaling transmission method, the IAB node, the target host, the source host, the apparatus, and the storage medium of the present embodiment are described below with reference to the accompanying drawings.

It should be noted that the technical solution provided by the embodiment of the present application may be applicable to various systems, especially 5G systems. For example, suitable systems may be global system for mobile communications (global system of mobile communication, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) universal packet Radio service (general packet Radio service, GPRS), long term evolution (long term evolution, LTE), LTE frequency division duplex (frequency division duplex, FDD), LTE time division duplex (time division duplex, TDD), long term evolution-advanced (long term evolution advanced, LTE-a), universal mobile system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX), 5G New air interface (New Radio, NR), and the like. Terminal devices and network devices are included in these various systems. Core network parts such as evolved packet system (Evloved Packet System, EPS), 5G system (5 GS) etc. may also be included in the system.

Fig. 3 is a flowchart of a control signaling transmission method according to an embodiment of the present application, where the control signaling transmission method is applied to an IAB node.

As shown in fig. 3, the method includes:

and step 31, obtaining information of a default channel and a default route between the target host and the IAB node.

The default channel is a default backhaul radio link control channel, and the default route is a default backhaul adaptation protocol route identifier.

The target host is a host to which the IAB node is to be switched.

In one embodiment of the application, the message may be reconfigured by receiving a first RRC (Radio Resource Control ) reconfiguration message; the first RRC reconfiguration message carries information of a default channel and a default route between the target host and the IAB node.

For example, the source host may send a handover request to the target host, which may receive the handover request, and may send a handover response to the source host in response to the handover request. The handover request carries a first RRC reconfiguration message, which is used to instruct the source host to send the first RRC reconfiguration message to the IAB node, so that the IAB node may receive the first RRC reconfiguration message sent by the source host, where the first RRC reconfiguration message carries information of a default channel and a default route between the target host and the IAB node.

Wherein the source host is the host before the IAB node is switched.

And step 32, transmitting control signaling with the target host by adopting a default channel and a default route.

Wherein the control signaling includes at least one of an RRC reconfiguration message, an RRC reconfiguration complete message, an F1 connection setup request, and an F1 connection setup response message.

As an implementation manner of an embodiment, when the IAB node is reconfigured, a default channel and the default route may be adopted to send a first RRC reconfiguration complete message corresponding to the first RRC reconfiguration message to the target host.

As an implementation of another embodiment, the IAB node may send an F1 connection setup request message to the target host using a default channel and a default route, where the F1 connection setup request is used to request establishment of an F1 connection between the IAB node and the target host.

As an implementation manner of another embodiment, the IAB node may receive, by using a default channel and a default route, an RRC reconfiguration message sent by the target host, where it is to be noted that the RRC reconfiguration message received by using the default channel and the default route is different from the first RRC reconfiguration message in step 01 that carries the default channel and the default route information. In addition, the RRC reconfiguration message received by the IAB node using the default channel and the default route may be an RRC reconfiguration message sent by the target host and used for reconfiguring the IAB node, or may be an RRC reconfiguration message sent by the target host and used for reconfiguring a next-hop communication node of the IAB node by a user, where the next-hop communication node may be a UE or a child node of the IAB node.

The embodiment of the application provides a control signaling transmission method, wherein an IAB node transmits control signaling with a target host by acquiring information of a default channel and a default route between the target host and the IAB node and then adopting the default channel and the default route. Therefore, in the process of switching the IAB node from the source host to the target host, the transmission control signaling can be sent through the default channel and the default route, and the completion of the migration of the IAB node at the upper layer is not required to be waited, so that the time delay of the message sending is reduced, and the technical problem that the time delay of the message sending is larger because the IAB node can send the transmission control signaling only after the IAB node at the upper layer is waited to be completed is avoided.

For easier understanding of the present application by those skilled in the art, fig. 4 is a schematic flow chart of a control signaling transmission method according to an embodiment of the present application, where the control signaling transmission method is applied to an IAB node.

As shown in fig. 4, the method includes:

step 41, a first RRC reconfiguration message is received.

The first RRC reconfiguration message carries configuration parameters of the IAB node, and information of a default channel and a default route between the target host and the IAB node.

Wherein, the configuration parameters of the IAB node are used for reconfiguring the IAB node.

Wherein the default channel is a default backhaul radio link control channel (defaultBH RLC channel) and the default route is a default backhaul adaptation protocol route identification (default BAP Routing ID configuration).

For example, the source host may send a handoff request to the target host requesting handoff of the migration node to the target host, the target host receiving the handoff request, may send a handoff response to the source host in response to the handoff request. The handover response at least carries the IAB node and its descendant node, and the RRC reconfiguration message of the UE, so that the source host receives the RRC reconfiguration message of the IAB node and its descendant node, and sends the RRC reconfiguration message of the IAB node and its descendant node to the corresponding IAB node, and sends the RRC reconfiguration message of the UE to the UE, so that each IAB node and the UE perform reconfiguration respectively.

As a first possible implementation manner, the IAB node may receive a first RRC reconfiguration message sent by the source host, where the first RRC reconfiguration message is carried in a handover response sent by the target host to the source host.

That is, the source host may send a handover request to the target host, where the target host receives the handover request and responds to the handover request, and sends a handover response to the source host, where the handover response carries a first RRC reconfiguration message, and the source host may receive the first RRC reconfiguration message sent by the target host, so that the source host sends the received first RRC reconfiguration message to the IAB node, and the IAB node receives the first RRC reconfiguration message sent by the source host.

As a second possible implementation manner, the IAB node may receive a first RRC reconfiguration message sent by a parent node of the IAB node, where the first RRC reconfiguration message is sent by the target host to the parent node through a default channel and a default route with the parent node.

Specifically, the parent node of the IAB node may be a top-level migration node that switches to the target host. The default channel and default route between the target host and the parent node specifically include that the target host carries a third configuration message of the parent node in a switching response sent to the source host, and the source host obtains the third RRC reconfiguration message from the switching response after receiving the switching response, and then sends the third RRC reconfiguration message to the parent node.

That is, the source host may send a handover request to the target host, where the target host receives the handover request and responds to the handover request, where the handover response carries a third reconfiguration message, and the third reconfiguration message may be sent to the source host, and based on a default channel and a default route between the target host and a parent node of the IAB carried in the source host, the target host may send a first RRC reconfiguration message to the parent node of the IAB, so that the parent node of the IAB sends the received first RRC reconfiguration message to the IAB node, and the IAB node receives the first RRC reconfiguration message sent by the parent node of the IAB.

Further, after receiving the first RRC reconfiguration message sent by the parent node, the IAB node may receive a fourth RRC reconfiguration message sent by the target host through a default channel and a default route with the IAB node; the fourth RRC reconfiguration message carries a default channel and a default route between a next-hop communication node of the IAB node and the target host, where the next-hop communication node is a UE or a child IAB node of the IAB node, and then sends the fourth RRC reconfiguration message to the next-hop communication node.

That is, after receiving the first RRC reconfiguration message sent by the parent node of the IAB, the IAB node may learn the default channel and default route with the target host. And further based on a default channel and a default route between the IAB node and the target host, the fourth RRC reconfiguration message sent by the target host may be received, and the fourth RRC reconfiguration message may be sent to the next-hop communication node.

And step 42, reconfiguring the IAB node according to the configuration parameters of the IAB node.

In the embodiment of the present application, after receiving the first RRC reconfiguration message, the IAB node may reconfigure the IAB node according to the configuration parameter of the IAB node carried in the first RRC reconfiguration message. The reconfiguration is mainly performed on the MT part of the IAB node, that is, the MT part of the IAB node is reconfigured by using the configuration parameters carried in the first RRC reconfiguration message.

And step 43, when the IAB node is reconfigured, a default channel and a default route are adopted to send a first RRC reconfiguration complete message to the target host.

For example, when the reconfiguration of the IAB node is completed, the IAB node may send a first RRC reconfiguration complete message to the target host using a default BH RLC channel and a default BAP (bandwidth allocation protocol) route.

Further, after the first RRC reconfiguration complete message is sent to the target host using the default channel and the default route, an F1 connection establishment request message may be sent to the target host using the default channel and the default route, where the F1 connection establishment request is used to request establishment of an F1 connection between the IAB node and the target host, so as to receive an F1 connection establishment response message sent by the target host using the default channel and the default route.

The embodiment of the application provides a control signaling transmission method, which is implemented by receiving a first RRC reconfiguration message; the first RRC reconfiguration message carries configuration parameters of the IAB node and information of a default channel and a default route between the target host and the IAB node, and then reconfigures the IAB node according to the configuration parameters of the IAB node, and under the condition that the reconfiguration of the IAB node is completed, the first RRC reconfiguration completion message is sent to the target host by adopting the default channel and the default route. Therefore, in the process of switching the IAB node from the source host to the target host, the reconfiguration completion message can be sent through the default channel and the default route, and the completion of the migration of the IAB node at the upper layer is not required to be waited, so that the time delay of the message sending is reduced, and the technical problem that the time delay of the message sending is larger because the IAB node can send the RRC reconfiguration completion message only after the IAB node at the upper layer is waited to be migrated is avoided.

To clearly illustrate the procedure of transmitting the RRC reconfiguration complete message of the UE to the target host after the UE reconfiguration is completed, fig. 5 is a flowchart of a control signaling transmission method according to an embodiment of the present application. The control signaling transmission method is applied to the IAB node, and the IAB node is a parent node of the UE.

As shown in fig. 5, the method includes:

step 51, receiving a first RRC reconfiguration message; the first RRC reconfiguration message carries configuration parameters of the IAB node, and information of a default channel and a default route between the target host and the IAB node.

As a possible implementation manner, the IAB node may receive, through an F1 connection with the source host, a first RRC reconfiguration message sent by the source host, where the first RRC reconfiguration message is carried in a handover response sent by the target host to the source host.

Step 52, receiving a second RRC reconfiguration message through the F1 connection with the source host.

The second RRC reconfiguration message carries configuration parameters used to reconfigure the UE.

It should be noted that the execution sequence of step 51 and step 52 may be that step 51 precedes step 52, or step 52 precedes step 51, or step 51 and step 52 may be executed synchronously. The execution order of the steps 51 and 52 is not limited in this embodiment.

Step 53, sending a second RRC reconfiguration message to the UE over the Uu interface between the IAB node and the UE.

For example, the IAB node serving as the UE parent node receives the second RRC reconfiguration message, may parse the second RRC reconfiguration message, and when it is identified that the configuration parameter is configured for reconfiguring the UE, the parent node of the UE may send the second RRC reconfiguration message to the UE based on the Uu interface between the UE parent node and the UE.

And step 54, receiving a second RRC reconfiguration complete message sent under the condition that the UE reconfiguration is completed.

In the embodiment of the application, the UE receives the second RRC reconfiguration message and performs reconfiguration, and after the UE performs reconfiguration, the UE may send a second RRC reconfiguration complete message to the IAB node serving as the parent node of the UE, and further the parent node of the UE may receive the second RRC reconfiguration complete message sent when the UE has completed reconfiguration.

And step 55, transmitting a second RRC reconfiguration complete message to the target host by using the default channel and the default route between the target host and the IAB node.

In one embodiment of the present application, an IAB node serving as a parent node of a UE receives a second RRC reconfiguration complete message sent when the UE is reconfigured, and temporarily stores the second RRC reconfiguration complete message if the IAB node is not reconfigured, until the IAB node is reconfigured, and then sends the second RRC reconfiguration complete message to the target host based on a default channel and a default route between the IAB node and the target host.

The embodiment of the application provides a control signaling transmission method, wherein an IAB node can receive a first RRC reconfiguration message by adopting a default channel and a default route, can reconfigure UE first and then reconfigure the IAB node, and further the UE and the IAB node can independently send a first RRC reconfiguration completion message to a target host through the default channel and the default route, the sending processes are not affected, and the IAB is not required to be sent again after the UE is sent, so that the time delay of message sending is reduced.

Fig. 6 is a flowchart of a control signaling transmission method according to an embodiment of the present application, where the control signaling transmission method is applied to a target host.

As shown in fig. 6, the method includes:

step 61, a first RRC reconfiguration message of the first IAB node is sent, where the first IAB node is to be handed over from the source host to the target host, and the first RRC reconfiguration message carries configuration parameters for reconfiguring the first IAB node, and information of a default channel and a default route between the target host and the first IAB node.

In the embodiment of the application, the target host sends a handover response to the source host, wherein the handover response carries a first RRC reconfiguration message, and is used for indicating the source host to send the first RRC reconfiguration message to the first IAB node.

Specifically, the source host may send a handover request to the target host, and the target host may send a handover response to the source host when receiving the handover request, where the handover response carries a first RRC reconfiguration message, and is configured to instruct the source host to send the first RRC reconfiguration message to the first IAB node. And the source host sends a first RRC reconfiguration message to the first IAB node, and the first IAB node receives the first RRC reconfiguration message and realizes the first RRC reconfiguration based on the configuration parameters carried in the first RRC reconfiguration message.

Optionally, the target host sends a handover response to the source host, where the handover response further carries a second RRC reconfiguration message of the UE, where the second RRC reconfiguration message carries configuration parameters for reconfiguring the UE. Specifically, after the handover response is sent to the source host, a channel and a route between the target host and the first IAB node serving as the UE parent node may be adopted, and a second RRC reconfiguration complete message sent by the parent node may be received, where the second RRC reconfiguration complete message is used to characterize that the UE reconfiguration is completed.

That is, the target host sends a handover response to the source host, the source host may send a second RRC reconfiguration message to the first IAB node when receiving the handover response, the first IAB node may send the second RRC reconfiguration message to the UE parent node based on the F1 signaling connection between the first IAB node and the UE parent node, so that the UE parent node receives the second RRC reconfiguration message, send the second RRC reconfiguration message to the UE through the Uu interface, so that the UE receives the second RRC reconfiguration message, and perform UE configuration.

Further, after the UE reconfigures, a second RRC reconfiguration complete message may be sent to the UE parent node, so that the UE parent node receives the second RRC reconfiguration complete message and sends the second reconfiguration complete message to the first IAB node serving as the UE parent node. The second reconfiguration completion message is used for representing that the UE is reconfigured.

The first IAB node serving as the UE parent node receives the second reconfiguration complete message sent by the UE, and may send the second reconfiguration complete message to the target host by using a default channel and a default route between the target host and the first IAB node serving as the UE parent node, so that the target host receives the second RRC reconfiguration complete message sent by the parent node.

As a second possible implementation manner, the sending of the first RRC reconfiguration message of the first IAB node may be implemented by the parent node of the first IAB sending the first RRC reconfiguration message to the first IAB node. Specifically, a default channel and default route between the target host and the second IAB node may be employed, and the target host may send a first RRC reconfiguration message to the second IAB node to send the first RRC reconfiguration message to the first IAB node through the second IAB node, where the second IAB node is a parent node of the first IAB node.

In one embodiment of the present application, a default channel and a default route between the target host and the second IAB node are adopted, and before the first RRC reconfiguration message is sent to the second IAB node, a third RRC reconfiguration message is sent to the second IAB node through the source host, where the third RRC reconfiguration message carries the default channel and the default route between the target host and the second IAB node.

That is, after the first IAB node is configured, the source host may first send a third RRC reconfiguration message to the parent node of the first IAB, where the third RRC reconfiguration message carries a default channel and a default route between the target host and the parent node of the first IAB, and then the target host sends the first RRC reconfiguration message to the parent node of the first IAB based on the default channel and the default route between the target host and the parent node of the first IAB, so as to implement that the parent node of the first IAB sends the first RRC reconfiguration message to the first IAB node.

Step 62, a first RRC reconfiguration complete message of the first IAB node is received using a default channel and a default route between the target host and the first IAB node.

That is, the first IAB node completes the first RRC reconfiguration complete message, and the first IAB node may send the first RRC reconfiguration complete message of the first IAB node to the target host based on the default channel and the default route between the target host and the first IAB node, and the target host may receive the first RRC reconfiguration complete message of the first IAB node.

In one embodiment of the present application, a default channel and a default route between a target host and a first IAB node are adopted, after receiving a first RRC reconfiguration complete message of the first IAB node, the first IAB node may receive an F1 connection establishment request message sent by the first IAB node using the default channel and the default route, and establish an F1 connection between the first IAB node and the target host; and adopting a default channel and a default route to send an F1 connection establishment response message to the first IAB node.

That is, after the target host receives the first RRC reconfiguration complete message of the first IAB node, the first IAB node may send an F1 connection setup request message to the target host to request establishment of an F1 connection between the first IAB node and the target host based on a default channel and a default route between the target host and the first IAB node, and the target host may send the F1 connection setup response message to the first IAB node using the default channel and the default route.

The embodiment of the application provides a control signaling transmission method, a target host can send a first RRC reconfiguration message of a first access backhaul integrated IAB node, the first RRC reconfiguration message carries configuration parameters for reconfiguring the first IAB node, and information of a default channel and a default route between the target host and the first IAB node, then the default channel and the default route between the target host and the first IAB node are adopted, and the target host can receive a first RRC reconfiguration completion message of the first IAB node. Therefore, in the process of switching the IAB node from the source host to the target host, the target host can receive the reconfiguration message through the default channel and the default route, so that the reconfiguration message is sent to the source host through the default channel and the default route, and the time delay for receiving and sending the message is reduced without waiting for the completion of the reconfiguration receiving and sending of the upper IAB node, thereby avoiding the technical problem that the RRC reconfiguration message can be received or sent only when the IAB node needs to wait for the completion of the reconfiguration receiving or sending of the IAB node at the upper layer, and the time delay for receiving the message is larger.

Fig. 7 is a flowchart of a control signaling transmission method according to an embodiment of the present application, where the control signaling transmission method is applied to a source host.

As shown in fig. 7, the method includes:

step 71, acquiring a first RRC reconfiguration message sent by the target host, where the first RRC reconfiguration message carries configuration parameters for reconfiguring the first IAB node, and information of a default channel and a default route between the target host and the first IAB node; the first IAB node is to be handed over from a source host to a target host.

In the embodiment of the application, a handover request can be sent to the target host, and a sent handover response of the target host is received, wherein the handover response carries a first RRC reconfiguration message.

That is, the source host may send a handover request to the target host, and the target host may send a handover response to the source host when receiving the handover request, so that the source host receives the handover response sent by the target host, where the handover response carries the first RRC reconfiguration message.

Optionally, the switching response further carries a second RRC reconfiguration message of the UE, where the second RRC reconfiguration message carries configuration parameters for reconfiguring the UE. After receiving the switching response of the target host, the source host can send a second RRC reconfiguration message to the UE parent node based on the F1 connection between the source host and the UE parent node; the second RRC reconfiguration message is configured to instruct the UE to reconfigure, and send a second RRC reconfiguration complete message to a parent node of the UE after the UE is configured, so that the parent node of the UE adopts a default channel and a default route with a target host, and sends the second RRC reconfiguration complete message to the target host.

For example, when the source host receives the handover response, based on the F1 connection between the source host and the parent node of the UE, the source host may send a second RRC reconfiguration message to the parent node of the UE, so that the UE parent node receives the second RRC reconfiguration message, and send the second RRC reconfiguration message to the UE through the Uu interface, so that the UE receives the second RRC reconfiguration message and performs UE reconfiguration.

And under the condition that the UE is configured, the UE can send a second RRC reconfiguration completion message to the UE parent node so that the UE parent node can receive the second RRC reconfiguration completion message, and the UE parent node can send the second RRC reconfiguration completion message to the target host based on a default channel and a default route between the UE parent node and the target host.

Step 72, sending a first RRC reconfiguration message to the first IAB node; the first RRC reconfiguration message is used for indicating the first IAB node to reconfigure according to the configuration parameters, and sending a first RRC reconfiguration completion message to the target host by adopting a default channel and a default route between the target host and the first IAB node.

In the embodiment of the present application, after the source host acquires the configuration parameters, the source host may send a first RRC reconfiguration message to the first IAB node, so that the first IAB node performs reconfiguration according to the configuration parameters, and after the first IAB node completes configuration, the first IAB node may send a first RRC reconfiguration complete message to the target host based on a connection between a default channel and a default route between the first IAB node and the target host.

In one embodiment of the present application, the plurality of first IAB nodes send the first RRC reconfiguration message to each of the first IAB nodes in parallel; or sending the first RRC reconfiguration message to each of the first IAB nodes according to a set order.

The embodiment of the application provides a control signaling transmission method, a source host can acquire a first RRC reconfiguration message sent by a target host, wherein the first RRC reconfiguration message carries configuration parameters for reconfiguring a first IAB node, and information of a default channel and a default route between the target host and the first IAB node; sending a first RRC reconfiguration message to the first IAB node; the first RRC reconfiguration message is used for indicating the first IAB node to reconfigure according to the configuration parameters, and sending a first RRC reconfiguration completion message to the target host by adopting a default channel and a default route between the target host and the first IAB node. Therefore, in the process of switching the IAB node from the source host to the target host, the source host can receive the reconfiguration message through the default channel and the default route, so that the reconfiguration completion message is sent to the target host through the default channel and the default route, and the time delay for receiving and sending the message is reduced without waiting for the completion of the reconfiguration receiving and sending of the upper IAB node, thereby avoiding the technical problem that the RRC reconfiguration message can be received and sent only after the IAB node needs to wait for the completion of the reconfiguration receiving and sending of the upper IAB node, and the time delay for receiving the message is larger.

Fig. 8 is a schematic flow chart of a control signaling transmission method according to an embodiment of the present application, so that a person skilled in the art can easily understand the present application. It should be noted that, the switching of the IAB node from the source host to the target host may be implemented by a migration manner from the bottom layer to the top layer. In the embodiment of the present application, the source host is the IAB host CU1 in fig. 8, the target host is the IAB host CU2 in fig. 8, the IAB node 5 is a parent node of the IAB node 6, and the IAB node 6 is a child node of the IAB node 5. The IAB node 6 is a parent node of the IAB node 7, and the IAB node 7 is a child node of the IAB node 6. The IAB node 3 is an access node of the source path and the IAB node 4 is an access node of the target path.

As shown in fig. 8, the method includes:

in step 81, IAB host 1 initiates a handover request requesting to handover the migration node and its following descendant nodes and UEs to IAB host 2.

The handover request carries one or more of context information of the IAB node and its descendant node, context information of all UE of UE below the IAB node and its descendant node, and topology information between the IAB node and its descendant node.

In step 82, the IAB host 2 may send a response to the IAB host 1 in response to the request, where the response request includes an RRC reconfiguration message for the migration node and its offspring nodes and the UE.

In step 83, the IAB host 1 sends the RRC reconfiguration message to the previous node IAB node 7 of the UE through the F1 interface signaling DL RRC transfer message, and then the IAB node 7 unpacks the packet, and after recognizing that the RRC reconfiguration message is the RRC reconfiguration message for the UE, the IAB host 1 sends the RRC reconfiguration message to the UE through the Uu interface.

In step 84, after the UE reconfiguration is completed, the RRC reconfiguration complete message is returned to the parent node IAB node 7, but at this time, the IAB node 6 and the IAB node 5 have not been migrated yet, and a default route and a default channel have not been configured yet, so that the IAB node 7 cannot transmit the RRC reconfiguration complete message of the UE to the IAB host 2.

It should be noted that, for the offspring node and the UE, since their connection to the parent node is unchanged, the random access procedure may not be performed.

In step 85, the IAB node 7 is reconfigured, and the RRC reconfiguration message also carries the default BH RLC channel and the default BAP route of the IAB node 7.

In step 86, the IAB node 7 may transmit an RRC reconfiguration complete message of the IAB node 7 and an RRC reconfiguration complete message of the UE to the IAB donor CU 2 through the default BH RLC channel and the default BAP route.

After the IAB node 7 is reconfigured in step 87, the IAB node 7 may send an F1 establishment request to the IAB host 2 through the default BH RLC channel and the default BAP route.

In step 88, IAB host 2 may respond to the F1 setup request sent by IAB node 7 and may send an F1 setup complete to IAB node 7 via the default BH RLC channel and the default BAP route.

Step 89, reconfigure IAB node 6. The IAB node CU 1 may send an RRC reconfiguration message to the previous-level IAB node 5 of the IAB node 6 via the default BH RLC channel and the default BAP route, where the IAB node 5 receives the RRC reconfiguration message, may parse the RRC reconfiguration message, and when it recognizes that the reconfiguration message is a reconfiguration message for the IAB node 6, may send the RRC reconfiguration message to the IAB node 6 for reconfiguration by the IAB node 6.

After the reconfiguration of the IAB node 6 is completed, an RRC reconfiguration complete message for transmitting the IAB node 6 may be sent to the IAB donor CU 2 through the default BH RLC channel and the default BAP route, step 810.

After the IAB node 7 is reconfigured in step 811, the IAB node 7 may send an F1 establishment request to the IAB host 2 through the default BH RLC channel and the default BAP route.

In step 812, IAB host 2 may respond to the F1 setup request sent by IAB node 7 and may send an F1 setup complete to IAB node 7 over the default BH RLC channel and the default BAP route.

Step 813, the migration node IAB node 5 is reconfigured.

Step 814, the re-configured IAB node 5 randomly accesses the access node IAB node 4 of the target path

In step 815, the IAB node 5 sends an RRC reconfiguration complete message to the IAB node 4.

In step 816, the IAB node 4 may send an RRC reconfiguration complete message carrying the IAB node 5 to the IAB host 2 via uplink transmission.

Step 817, the F1 set-up procedure of the iab node 5.

Step 818, the F1 setup procedure of iab node 5.

It should be noted that, in the embodiment of the present application, if the default BH RLC channel and the default BAP route are not used for the IAB node 7, it is necessary to wait until both the IAB node 5 and the IAB node 6 have migrated before sending the RRC reconfiguration complete message and performing the F1 connection establishment procedure. After using the default BH RLC channel and default BAP route, delay of the IAB node 7 is reduced, and the operation can be performed without waiting until the IAB node 5 and the IAB node 6 have been migrated. Also, it is not necessary for the IAB node 6 to wait for the IAB node 5 to finish the migration. But for the UE it is necessary to wait until the IAB nodes 7, 6, 5 have been migrated to completion.

Based on the above embodiment, in order to further reduce the delay, in the embodiment of the present application, as shown in fig. 9, RRC reconfiguration may be performed on all the offspring nodes and the UE first, then the RRC reconfiguration complete message of each offspring node may be performed simultaneously, and the F1 connection establishment process of the offspring node may also be performed simultaneously. Fig. 9 is a flowchart of a control signaling transmission method according to an embodiment of the present application.

As shown in fig. 9, the method includes:

step 91, the iab host 1 initiates a handover request requesting to migrate the node and its descendant nodes and UEs therebelow

Switch to IAB host 2.

In step 92, the IAB host 2 may send a response to the IAB host 1 in response to the request, where the response request includes an RRC reconfiguration message for the migration node and its offspring nodes and the UE.

In step 93, the IAB host 1 sends the RRC reconfiguration message to the previous node IAB node 7 of the UE through the F1 interface signaling DL RRC transfer message, and then the IAB node 7 unpacks the packet, and after recognizing that the RRC reconfiguration message is the RRC reconfiguration message for the UE, the IAB host sends the RRC reconfiguration message to the UE through the Uu interface.

In step 94, the IAB host 1 sends the RRC reconfiguration message to the previous node IAB node 6 of the IAB node 7, and then the IAB node 6 unpacks the RRC reconfiguration message, and after identifying that the RRC reconfiguration message is the RRC reconfiguration message for the IAB node 7, the RRC reconfiguration message is transferred to the IAB node 7 through the Uu interface.

In step 95, the IAB host 1 sends the RRC reconfiguration message to the previous node IAB node 5DU of the IAB node 6, and then the IAB node 5 unpacks the RRC reconfiguration message, and after identifying that the RRC reconfiguration message is the RRC reconfiguration message for the IAB node 6, the RRC reconfiguration message is transferred to the IAB node 6 through the Uu interface.

In step 96, the IAB host 1 sends the RRC reconfiguration message to the previous node IAB node 3DU of the IAB node 5, and then the IAB node 3 unpacks the RRC reconfiguration message, and after identifying that the RRC reconfiguration message is for the IAB node 5, the RRC reconfiguration message is transferred to the IAB node 5 through the Uu interface.

In step 97, the IAB node 5 may send an RRC reconfiguration message to the IAB host 1 for storage.

In step 98, the UE and the IAB node 7 send an RRC reconfiguration complete message of the UE and the IAB node 7 to the IAB host 2 through the default BH RLC channel and the default BAP route.

In step 99, the IAB node 6DU sends an RRC reconfiguration complete message of the IAB node 6 to the IAB host 2 through the default BH RLC channel and the default BAP route.

In step 910, the IAB node 5 sends an RRC reconfiguration complete message of the IAB node 5 to the IAB host 2 through the default BH RLC channel and the default BAP route.

It should be noted that, the UE, the IAB node 7, the IAB node 6, and the IAB node 5 may send the self-completion configuration message to the IAB host 2 at the same time, so that the time delay may be reduced and the time may be saved.

In step 911, the IAB node 5 may establish an F1 connection with the IAB host 2 through the default BH RLC channel and the default BAP route.

In step 912, the IAB node 6 may establish an F1 connection with the IAB host 2 through the default BH RLC channel and the default BAP route.

In step 913, the IAB node 7 may establish an F1 connection with the IAB host 2 through the default BH RLC channel and the default BAP route.

It should be noted that, the IAB node 5, the IAB node 6, and the IAB node 7 may establish an F1 connection with the IAB host 2 by using the default BH RLC channel and the default BAP route at the same time, so that the problem of time delay may be reduced.

Fig. 10 is a schematic flow chart of a control signaling transmission method according to an embodiment of the present application, so that a person skilled in the art can easily understand the present application. It should be noted that, the handover of the IAB node from the source host to the target host may be implemented by a migration manner from the top layer IAB node to the bottom layer UE. Wherein the F1 connection establishment is also from top layer to bottom layer. In the embodiment of the present application, the source host is the IAB host 1 in fig. 10, the target CU is the IAB host 2 in fig. 10, the IAB node 5 is a parent node of the IAB node 6, and the IAB node 6 is a child node of the IAB node 5. The IAB node 6 is a parent node of the IAB node 7, and the IAB node 7 is a child node of the IAB node 6. The IAB node 3 is an access node of the source path and the IAB node 4 is an access node of the target path.

As shown in fig. 10, the method includes:

step 101, the iab host 1 initiates a handover request requesting to migrate the node and its descendant nodes and UEs therebelow

Switch to IAB host 2.

In step 102, the IAB host 2 may send a response to the IAB host 1 in response to the request, where the response request includes an RRC reconfiguration message for the migration node and its offspring nodes and the UE.

In step 103, the IAB host 1 sends the RRC reconfiguration message to the previous node IAB node 3 of the IAB node 5, and then the IAB node 3 unpacks the RRC reconfiguration message, and when the IAB node 3 recognizes that the RRC reconfiguration message is for the IAB node 5, the RRC reconfiguration message may be transferred to the IAB node 5, and then the IAB node 5 receives the RRC reconfiguration message and performs reconfiguration.

In step 104, the IAB node 5 may send a reconfiguration complete message to the IAB node 4 for storage.

In step 105, the IAB node 4 may send a stored reconfiguration complete message to the IAB host 2.

In step 106, the IAB host 2 sends the RRC reconfiguration message to the previous node IAB node 5 of the IAB node 6 through the default BH RLC channel and the default BAP route, and the IAB node 5 receives the RRC reconfiguration message, may identify the RRC reconfiguration message, and after identifying that the RRC reconfiguration message is the RRC reconfiguration message for the IAB node 6, may send the RRC reconfiguration message to the IAB node 6.

After the reconfiguration of the IAB node 6 is completed in step 107, the reconfiguration complete information may be sent to the IAB host 2 through the default BH RLC channel and the default BAP route.

In step 108, the IAB node 5 may send an F1 set-up connection request to the IAB host 2.

In step 109, IAB host 2 may respond to the connection establishment request with IAB node 5F1 and send to IAB node 5.

In step 1010, the IAB host 2 sends the RRC reconfiguration message to the previous node IAB node 6 of the IAB node 7 through the default BH RLC channel and the default BAP route, and the IAB node 6 receives the RRC reconfiguration message, and may identify the RRC reconfiguration message, and after identifying that the RRC reconfiguration message is the RRC reconfiguration message for the IAB node 7, may send the RRC reconfiguration message to the IAB node 7.

After the reconfiguration of the IAB node 7 is completed, the default BH RLC channel and the default BAP route may send reconfiguration complete information to the IAB host 2 in step 1011.

In step 1012, the IAB node 6 may send an F1 set-up connection request to the IAB host 2.

In step 1013, IAB host 2 may respond to the F1 set up connection request with IAB node 6 and send to IAB node 6.

In step 1014, the IAB host 2 sends the RRC reconfiguration message to the previous node IAB node 7 of the UE through the default BH RLC channel and the default BAP route, and the IAB node 7 receives the RRC reconfiguration message, may identify the RRC reconfiguration message, and after identifying that the RRC reconfiguration message is the RRC reconfiguration message for the UE, may send the RRC reconfiguration message to the UE.

After the ue reconfigures, in step 1015, reconfiguration complete information may be sent to IAB host 2 through the default BH RLC channel and the default BAP route.

In step 1016, the IAB node 7 may send an F1 set-up connection request to the IAB host 2.

In step 1017, the IAB host 2 may respond to the F1 set up connection request with the IAB node 7 and send to the IAB node 7.

In the above embodiment, the RRC reconfiguration complete message of the IAB node 6 needs to be transmitted after the IAB host 2 establishes the F1 connection request, specifically, the RRC reconfiguration complete message of the IAB node 6 is sent to the IAB node 4, and then the IAB node 4 transmits the RRC reconfiguration complete message to the IAB host 2 through UL.

In the above embodiment, the IAB node 6 sends the reconfiguration complete information to the IAB host 2 without waiting for the IAB node 5 to establish the F1 connection with the IAB host 2 to send the reconfiguration complete information to the IAB host 2 through the default BH RLC channel and the default BAP route.

It should be noted that, the IAB node 6, the IAB node 7, and the UE may send the reconfiguration complete message to the IAB host 2 at the same time, so that the time delay may be reduced and the time may be saved.

It should be noted that, in the above embodiment, after the reconfiguration of the IAB node 5 is completed, before the F1 connection of the IAB node 5 is established, the IAB node 6 may also perform the reconfiguration, and the IAB host 2 sends an RRC reconfiguration message to the IAB node 6 through the default configuration of the IAB node 5. Because the IAB node 5 has not completed the F1 connection establishment procedure, only the reconfiguration is performed, and thus a reconfiguration complete message cannot be sent to the IAB host 2 through the IAB node 4. An RRC reconfiguration complete message may thus be transmitted to CU2 over the default BH RLC channel and default BAP route between the IAB node 6DU and IAB host 2, with configuration information for the default channel being carried to the IAB node 6 over the RRC reconfiguration message.

Fig. 11 is a schematic structural diagram of an access backhaul integrated IAB node according to an embodiment of the present application.

As shown in fig. 11, the IAB node includes a transceiver 1100, a processor 1110, and a memory 1120, where:

a transceiver 1100 for receiving and transmitting data under the control of a processor 1110.

Wherein in fig. 11, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 1110 and various circuits of memory represented by memory 1120, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 1100 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over transmission media, including wireless channels, wired channels, optical cables, etc.

As shown in fig. 11, the IAB node may further include a user interface 1130. The user interface 1130 may also be an interface capable of interfacing with an internal desired device, including but not limited to a keypad, display, speaker, microphone, joystick, etc., for different user devices.

The processor 1110 is responsible for managing the bus architecture and general processing, and the memory 1120 may store data used by the processor 1110 in performing operations.

Alternatively, the processor 1110 may be a CPU (central processing unit), ASIC (Application Specific Integrated Circuit ), FPGA (Field-Programmable Gate Array, field programmable gate array) or CPLD (Complex Programmable Logic Device ), and the processor 1110 may also employ a multi-core architecture.

The processor 1110 executes the following operations by calling a computer program stored in the memory:

acquiring information of a default channel and a default route between a target host and the IAB node; the target host is a host to which the IAB node is to be switched;

transmitting control signaling with the target host by adopting the default channel and the default route;

wherein the control signaling includes at least one of a radio resource control, RRC, reconfiguration complete message, F1 connection setup request, and F1 connection setup response message.

Optionally, as another embodiment, the processor 1110 is further configured to:

obtaining information of a default channel and a default route between the target host and the IAB node, including:

Optionally, as another embodiment, the processor 1110 is further configured to:

the transmitting control signaling with the target host using the default channel and the default route includes:

Optionally, as another embodiment, the processor 1110 is further configured to:

after the sending the first RRC reconfiguration complete message to the target host using the default channel and the default route, the method further includes:

Optionally, as another embodiment, the processor 1110 is further configured to: the IAB node is a parent node of the UE, and before receiving the first RRC reconfiguration message, the method further includes:

Optionally, as another embodiment, the processor 1110 is further configured to: the receiving a first RRC reconfiguration message includes:

Optionally, as another embodiment, the processor 1110 is further configured to: after receiving the first RRC reconfiguration message, the method further includes:

It should be noted that, the IAB node provided in the embodiment of the present invention can implement all the method steps implemented in the method embodiment and achieve the same technical effects, and the same parts and beneficial effects as those of the method embodiment in the embodiment are not described in detail herein.

Fig. 12 is a schematic diagram of a target host according to an embodiment of the present application. As shown in fig. 12, the target host may include a transceiver 1200, a processor 1210, and a memory 1220, where:

transceiver 1200 for receiving and transmitting data under the control of processor 1210.

Wherein in fig. 12, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 1210 and various circuits of memory represented by memory 1220, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 1200 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. The processor 1210 is responsible for managing the bus architecture and general processing, and the memory 1220 may store data used by the processor 1210 in performing operations.

Processor 1210 may be a Central Processing Unit (CPU), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field-programmable gate array (Field-Programmable Gate Array, FPGA) or complex programmable logic device (Comple 13 Programmable Logic Device, CPLD), and may also employ a multi-core architecture.

Processor 1210 executes the following operations by calling a computer program stored in memory:

transmitting information of a default channel and a default route between the target host and a first access backhaul integrated IAB node; wherein the first IAB node is to be handed over from a source host to the target host;

transmitting control signaling with the first IAB node by adopting the default channel and the default route;

Optionally, as another embodiment, the processor 1210 is further configured to:

the sending the information of the default channel and the default route between the target host and the first IAB node includes:

Optionally, as another embodiment, the processor 1210 is further configured to: the transmitting control signaling with the first IAB node by using the default channel and the default route includes:

Optionally, as another embodiment, the processor 1210 is further configured to: the switching response also carries a second RRC reconfiguration message of the terminal UE, and the second RRC reconfiguration message carries configuration parameters for reconfiguring the UE;

Optionally, as another embodiment, the processor 1210 is further configured to: the sending the information of the default channel and the default route between the target host and the first access backhaul integrated IAB node includes:

Optionally, as another embodiment, the processor 1210 is further configured to: before the default channel and default route between the target host and the second IAB node are adopted to send the first RRC reconfiguration message to the second IAB node, the method further includes:

It should be noted that, the target host provided in the embodiment of the present invention can implement all the method steps implemented in the method embodiment and achieve the same technical effects, and the same parts and beneficial effects as those of the method embodiment in the embodiment are not described in detail herein.

Fig. 13 is a schematic structural diagram of a source host according to an embodiment of the present application. As shown in fig. 13, the second terminal may include a transceiver 1300, a processor 1310, a memory 1320, wherein:

transceiver 1300 for receiving and transmitting data under the control of processor 1310.

Where in FIG. 13, a bus architecture may comprise any number of interconnected buses and bridges, with various circuits of the one or more processors, specifically represented by processor 1310, and the memory, represented by memory 1320, being linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 1300 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. The processor 1310 is responsible for managing the bus architecture and general processing, and the memory 1320 may store data used by the processor 1310 in performing operations.

The processor 1310 may be a Central Processing Unit (CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a Field-programmable gate array (Field-Programmable Gate Array, FPGA), or a complex programmable logic device (complex 13 Programmable Logic Device, CPLD), or the processor may employ a multi-core architecture.

Processor 1310 executes the computer program stored by the memory by calling the following operations:

acquiring a first RRC reconfiguration message sent by a target host, wherein the first RRC reconfiguration message carries configuration parameters for reconfiguring a first IAB node, and information of a default channel and a default route between the target host and the first IAB node; the first IAB node is to be switched from a source host to the target host;

transmitting the first RRC reconfiguration message to the first IAB node; the first RRC reconfiguration message is configured to instruct the first IAB node to reconfigure according to the configuration parameter, and send a first RRC reconfiguration complete message to the target host by adopting a default channel and a default route between the target host and the first IAB node.

Optionally, as another embodiment, the processor 1310 is further configured to: the obtaining the first RRC reconfiguration message sent by the target host includes:

Sending a switching request to the target host;

Optionally, as another embodiment, the processor 1310 is further configured to: the switching request also carries a second RRC reconfiguration message of the terminal UE, and the second RRC reconfiguration message carries configuration parameters for reconfiguring the UE;

It should be noted that, the source host provided in the embodiment of the present invention can implement all the method steps implemented in the method embodiment and achieve the same technical effects, and the same parts and beneficial effects as those of the method embodiment in the embodiment are not described in detail herein.

Fig. 14 is a schematic structural diagram of a control signaling transmission device according to an embodiment of the present application.

As shown in fig. 14, the control signaling transmission device is applied to an access backhaul integrated IAB node, and the device 140 includes:

an acquiring information unit 1401, configured to acquire information of a default channel and a default route between a target host and the IAB node; the target host is a host to which the IAB node is to be switched;

a first transmission instruction unit 1402, configured to transmit control signaling with the target host using the default channel and the default route;

Further, on the basis of the above embodiment, the acquisition information unit 1401 is specifically configured to: receiving a first RRC reconfiguration message; the first RRC reconfiguration message carries information of a default channel and a default route between the target host and the IAB node.

Further, based on the above embodiment, the first transmission instruction unit 1402 is specifically configured to: and under the condition that the IAB node is reconfigured, adopting the default channel and the default route to send a first RRC reconfiguration completion message to the target host.

Further, on the basis of the above embodiment, after the first transmission instruction unit 140214, the apparatus further includes:

a fourth sending unit, configured to send an F1 connection establishment request message to the target host using the default channel and the default route; the F1 connection establishment request is used for requesting to establish F1 connection between the IAB node and the target host;

and the third receiving unit is used for receiving the F1 connection establishment response message sent by the target host by adopting the default channel and the default route.

Further, the IAB node is a parent node of the UE, and before the information unit 1401 is acquired, the apparatus further includes:

a fourth receiving unit, configured to receive a second RRC reconfiguration message through an F1 connection with the source host; the second RRC reconfiguration message carries a configuration parameter used to reconfigure the UE; the source host is the host before the IAB node is switched; the method comprises the steps of carrying out a first treatment on the surface of the

A fifth sending unit, configured to send the second RRC reconfiguration message to the UE through a Uu interface between the IAB node and the UE;

a fifth receiving unit, configured to receive a second RRC reconfiguration complete message sent when the UE reconfigures;

After the information unit 1401 is acquired, further includes:

a sixth sending unit, configured to send the second RRC reconfiguration complete message to the target host using a default channel and the default route between the target host and the IAB node.

Further, the information acquisition unit 1401 is specifically configured to:

Further, the information acquisition unit 1401 is specifically configured to: and receiving the first RRC reconfiguration message sent by the parent node of the IAB, wherein the first RRC reconfiguration message is sent to the parent node by the target host through a default channel and a default route between the target host and the parent node.

Further, the information acquisition unit 1401 is specifically configured to:

the parent node of the IAB is a top-level migration node switched to the target host; the default channel and default route between the target host and the parent node are carried in a third RRC reconfiguration message sent by the source host, where the third reconfiguration message is carried in a handover response sent by the target host to the source host.

Further, on the basis of the above embodiment, after the information unit 1401 is acquired, the apparatus further includes:

a sixth receiving unit, configured to receive a fourth RRC reconfiguration message sent by the target host through a default channel and a default route with the IAB node; the fourth RRC reconfiguration message carries a default channel and a default route between a next-hop communications node of the IAB node and the target host, where the next-hop communications node is UE or a sub-IAB node of the IAB node;

a seventh sending unit, configured to send the fourth RRC reconfiguration message to the next hop communication node.

Further, based on the foregoing embodiment, the default channel is a default backhaul radio link control channel, and the default route is a default backhaul adaptation protocol route identifier.

The method and the device are based on the same application, and because the principles of solving the problems by the method and the device are similar, the implementation of the device and the method can be referred to each other, and the repetition is not repeated.

Fig. 15 is a schematic structural diagram of a control signaling transmission device according to an embodiment of the present application.

As shown in fig. 15, the apparatus is applied in a target host, and the apparatus 150 includes:

A sending information unit 1501, configured to send a first RRC reconfiguration message of a first access backhaul integrated IAB node, where the first IAB node is switched from a source host to the target host;

a second transmission instruction unit 1502, configured to transmit control signaling with the first IAB node by using the default channel and the default route; wherein the control signaling includes at least one of a radio resource control, RRC, reconfiguration complete message, F1 connection setup request, and F1 connection setup response message.

Further, the sending information unit 1501 is specifically configured to: transmitting a switching response to the source host, wherein the switching response carries a first RRC reconfiguration message and is used for indicating the source host to transmit the first RRC reconfiguration message to the first IAB node; the first RRC reconfiguration message carries information of a default channel and a default route between the target host and the first IAB node. .

Further, the second transmission instruction unit 1502 is specifically configured to receive a first RRC reconfiguration complete message of the first IAB node by using the default channel and the default route between the target host and the first IAB node.

Further, the switching response also carries a second RRC reconfiguration message of the terminal UE, where the second RRC reconfiguration message carries a configuration parameter used for reconfiguring the UE;

after said sending information unit 1501, the apparatus further comprises:

a seventh receiving unit, configured to receive a second RRC reconfiguration complete message sent by the parent node, where the second RRC reconfiguration complete message is used to characterize that the UE is reconfigured, by using the default channel and the default route between the target host and the first IAB node that is the parent node of the UE.

Further, the sending information unit 1501 is specifically configured to: transmitting the first RRC reconfiguration message to a second IAB node by adopting a default channel and a default route between the target host and the second IAB node so as to transmit the first RRC reconfiguration message to the first IAB node through the second IAB node; wherein the second IAB node is a parent node of the first IAB node

Further, before sending the information unit 1501, the apparatus further comprises:

an eighth sending unit, configured to send a third RRC reconfiguration message to the second IAB node through the source host, where the third RRC reconfiguration message carries a default channel and a default route between the target host and the second IAB node.

Further, after the second transmission instruction unit 1502, the apparatus further includes:

an eighth receiving unit, configured to receive an F1 connection establishment request message sent by the first IAB node by using the default channel and the default route;

a connection unit, configured to establish an F1 connection between the first IAB node and the target host;

and a ninth sending unit, configured to send an F1 connection establishment response message to the first IAB node by using the default channel and the default route.

Further, the default channel is a default backhaul radio link control channel; the default route is a default backhaul adaptation protocol route identification.

As shown in fig. 16, the apparatus is applied in a source host, and the apparatus 160 includes:

a first obtaining unit 1601, configured to obtain a first RRC reconfiguration message sent by a target host, where the first RRC reconfiguration message carries configuration parameters for reconfiguring a first IAB node, and information of a default channel and a default route between the target host and the first IAB node; the first IAB node is switched from a source host to a target host;

A third sending unit 1602, configured to send the first RRC reconfiguration message to the first IAB node; the first RRC reconfiguration message is configured to instruct the first IAB node to reconfigure according to the configuration parameter, and send a first RRC reconfiguration complete message to the target host by adopting a default channel and a default route between the target host and the first IAB node.

Further, the first acquisition unit 1601 is specifically configured to:

sending a switching request to the target host;

Further, the switching request also carries a second RRC reconfiguration message of the terminal UE, and the second RRC reconfiguration message carries configuration parameters for reconfiguring the UE;

after the first obtaining unit 1601, the apparatus further includes:

a tenth sending unit, configured to send the second RRC reconfiguration message to a parent node of the UE through an F1 connection with the parent node; the second RRC reconfiguration message is configured to instruct the UE to reconfigure, and send a second RRC reconfiguration complete message to the parent node after the configuration is completed, so that the parent node adopts a default channel and a default route with the target host, and sends the second RRC reconfiguration complete message to the target host.

Further, the plurality of first IAB nodes, the third sending unit 1602 is specifically configured to:

It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice. In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a processor-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or partly in the form of a software product or all or part of the technical solution, where the software product is stored in a storage medium, and includes several instructions to cause a computer device (which may be a personal computer, a server, or a network side device, etc.) or a processor (processor) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

It should be noted that, the above device provided in the embodiment of the present application can implement all the method steps implemented in the method embodiment and achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those in the method embodiment in this embodiment are omitted.

In another aspect, an embodiment of the present application further provides a processor readable storage medium, where a computer program is stored, where the computer program is configured to cause a processor to execute the control signaling transmission method shown in the embodiment of fig. 3 to 11 of the present application.

Among other things, the above-described processor-readable storage medium may be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic memories (e.g., floppy disks, hard disks, magnetic tapes, magneto-optical disks (MOs), etc.), optical memories (e.g., CD, DVD, BD, HVD, etc.), semiconductor memories (e.g., ROM, EPROM, EEPROM, nonvolatile memories (NAND FLASH), solid State Disks (SSDs)), etc.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A control signaling transmission method, wherein the method is applied to an access backhaul integrated IAB node, the method comprising:

Wherein the control signaling includes at least one of a radio resource control RRC reconfiguration message, an RRC reconfiguration complete message, an F1 connection establishment request, and an F1 connection establishment response message;

the obtaining information of a default channel and a default route between the target host and the IAB node includes:

receiving a first RRC reconfiguration message; the first RRC reconfiguration message carries information of a default channel and a default route between the target host and the IAB node;

the receiving a first RRC reconfiguration message includes:

2. The control signaling transmission method according to claim 1, wherein said transmitting control signaling with said target host using said default channel and said default route comprises:

3. The control signaling transmission method according to claim 2, wherein after said sending a first RRC reconfiguration complete message to said target host using said default channel and said default route, further comprising:

4. The control signaling transmission method according to claim 1, wherein the IAB node is a parent node of a user equipment UE, and before the receiving the first RRC reconfiguration message, further comprising:

5. The control signaling transmission method according to claim 1, wherein the receiving the first RRC reconfiguration message further comprises:

6. The method according to claim 5, wherein the parent node of the IAB is a top-level migration node that switches to the target host; the default channel and default route between the target host and the parent node are carried in a third RRC reconfiguration message sent by the source host, wherein the third RRC reconfiguration message is carried in a switching response sent by the target host to the source host; the source host is the host prior to the IAB node handoff.

7. The control signaling transmission method according to claim 5, wherein after receiving the first RRC reconfiguration message, further comprising:

8. The control signaling transmission method according to any of claims 1-7, characterized in that the default channel is a default backhaul radio link control channel; the default route is a default backhaul adaptation protocol route identification.

9. A control signaling transmission method, wherein the method is applied to a target host, the method comprising:

10. The control signaling transmission method according to claim 9, wherein said transmitting control signaling with said first IAB node using said default channel and said default route comprises:

11. The method for transmitting control signaling according to claim 9, wherein the handover response further carries a second RRC reconfiguration message of the terminal UE, where the second RRC reconfiguration message carries configuration parameters for reconfiguring the UE;

after the switching response is sent to the source host, the method further comprises:

12. The control signaling transmission method according to claim 9, wherein said sending information of a default channel and a default route between the target host and the first access backhaul integrated IAB node comprises:

13. The control signaling transmission method of claim 12 wherein prior to said sending said first RRC reconfiguration message to said second IAB node using a default channel and a default route between said target host and said second IAB node, further comprising:

14. The control signaling transmission method of claim 10 wherein said receiving a first RRC reconfiguration complete message for said first IAB node using said default channel and said default route between said target host and said first IAB node further comprises:

establishing an F1 connection between the first IAB node and the target host;

15. The control signaling transmission method according to any of claims 9-14, characterized in that the default channel is a default backhaul radio link control channel; the default route is a default backhaul adaptation protocol route identification.

16. A control signaling method, wherein the method is applied to a source host, the method comprising:

transmitting the first RRC reconfiguration message to the first IAB node; the first RRC reconfiguration message is configured to instruct the first IAB node to reconfigure according to the configuration parameter, and send a first RRC reconfiguration complete message to the target host by adopting a default channel and a default route between the target host and the first IAB node;

the obtaining the first RRC reconfiguration message sent by the target host includes:

sending a switching request to the target host;

17. The control signaling transmission method according to claim 16, wherein the handover request further carries a second RRC reconfiguration message of the terminal UE, and the second RRC reconfiguration message carries configuration parameters for reconfiguring the UE;

18. The method for control signaling according to any of claims 16-17, wherein the first IAB node is plural, and the sending the first RRC reconfiguration message to the first IAB node comprises:

19. The control signaling method according to any of claims 16-17, characterized in that the default channel is a default backhaul radio link control channel; the default route is a default backhaul adaptation protocol route identification.

20. An access backhaul integrated IAB node, wherein the IAB node comprises a memory, a transceiver, and a processor:

a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

the receiving a first RRC reconfiguration message includes:

21. The IAB node of claim 20, wherein said employing said default channel and said default route for transmission of control signaling with said target host comprises:

22. The IAB node of claim 21, wherein after said sending a first RRC reconfiguration complete message to said target host using said default channel and said default route, further comprises:

23. The IAB node of claim 20, wherein the IAB node is a parent node of a user equipment, UE, and wherein prior to receiving the first RRC reconfiguration message, further comprises:

24. The IAB node of claim 20, wherein the receiving the first RRC reconfiguration message comprises:

25. The IAB node of claim 24, wherein after receiving the first RRC reconfiguration message, further comprising:

26. A target host comprising a memory, a transceiver, and a processor:

27. The target host of claim 26, wherein said employing said default channel and said default route for transmission of control signaling with said first IAB node comprises:

28. The target host according to claim 26, wherein the handover response further carries a second RRC reconfiguration message of the terminal UE, where the second RRC reconfiguration message carries configuration parameters for reconfiguring the UE;

29. The target host of claim 26, wherein the sending information for the default channel and default route between the target host and the first access backhaul integrated IAB node comprises:

30. The target host of claim 29, wherein the default channel and default route between the target host and a second IAB node is employed, further comprising, prior to sending the first RRC reconfiguration message to the second IAB node:

31. A source host comprising a memory, a transceiver, and a processor:

sending a switching request to the target host;

32. The source host according to claim 31, wherein the handover request further carries a second RRC reconfiguration message of the terminal UE, the second RRC reconfiguration message carrying configuration parameters for reconfiguring the UE;

33. A control signaling transmission apparatus, the apparatus being applied to an access backhaul integrated IAB node, the apparatus comprising:

An information obtaining unit, configured to obtain information of a default channel and a default route between a target host and the IAB node; the target host is a host to which the IAB node is to be switched;

a first transmission instruction unit, configured to transmit control signaling with the target host by using the default channel and the default route;

the receiving a first RRC reconfiguration message includes:

34. A control signaling transmission apparatus, the apparatus being for application to a target host, the apparatus comprising:

a sending information unit, configured to send information of a default channel and a default route between the target host and the first access backhaul integrated IAB node; wherein the first IAB node is to be handed over from a source host to the target host;

a second transmission instruction unit, configured to transmit control signaling with the first IAB node by using the default channel and the default route;

35. A control signaling transmission apparatus, the apparatus being applied to a source host, the apparatus comprising:

a first obtaining unit, configured to obtain a first RRC reconfiguration message sent by a target host, where the first RRC reconfiguration message carries configuration parameters for reconfiguring a first IAB node, and information of a default channel and a default route between the target host and the first IAB node; the first IAB node is to be switched from a source host to the target host;

a third sending unit, configured to send the first RRC reconfiguration message to the first IAB node; the first RRC reconfiguration message is configured to instruct the first IAB node to reconfigure according to the configuration parameter, and send a first RRC reconfiguration complete message to the target host by adopting a default channel and a default route between the target host and the first IAB node;

sending a switching request to the target host;

36. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing the processor to perform the method of any one of claims 1 to 8, or the method of any one of claims 9 to 15, or the method of any one of claims 16 to 19.