CN114390602B

CN114390602B - Connection establishment method, device, equipment and storage medium

Info

Publication number: CN114390602B
Application number: CN202011110955.4A
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: 2023-09-19
Anticipated expiration: 2040-10-16
Also published as: WO2022078112A1; CN114390602A

Abstract

The application discloses a connection establishment method, a device, equipment and a storage medium, and relates to the technical field of communication. The specific implementation scheme is as follows: sending an F1 connection establishment request to a target host, wherein the F1 connection establishment request is used for requesting to establish an F1 connection between the IAB node and the target host; the target host is the host to which the IAB node is to be switched; receiving an F1 connection establishment response message sent by the target host; and sending indication information to the sub-node of the IAB node, wherein the indication information is used for triggering F1 connection establishment or migration of the sub-node of the IAB node. Therefore, after the F1 connection is successfully established, the IAB node can send indication information to the child node to trigger the F1 connection establishment or migration of the child node, so that the IAB node and its descendant node establish new F1 connection or migration with a target host, and the migration between hosts of the IAB node is realized.

Description

Connection establishment method, device, equipment and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a connection establishment method, apparatus, device, and storage medium.

Background

Currently, with the development of integrated access backhaul (Integrated Access and Backhaul, IAB) technology, the requirement on the mobility of the IAB node is also higher and higher.

Related art relates to intra-host migration of IAB nodes. Intra-host migration refers to the switching of an IAB node and its descendant nodes from one distributed unit of a host to another distributed unit, without involving the switching of the host and without involving the establishment of a new F1 connection.

When inter-host migration needs to be performed on the IAB node, the IAB node and its descendant nodes need to establish a new F1 connection with the target host, however, in the related art, how the IAB node and its descendant nodes establish a new F1 connection with the target host is not involved.

Disclosure of Invention

The disclosure provides a connection establishment method, a device, equipment and a storage medium.

According to an aspect of the present disclosure, there is provided a connection establishment method applied to an access backhaul integrated IAB node, the method including:

sending an F1 connection establishment request to a target host, wherein the F1 connection establishment request is used for requesting to establish an F1 connection between the IAB node and the target host; the target host is the host to which the IAB node is to be switched;

Receiving an F1 connection establishment response message sent by the target host;

and sending indication information to the sub-node of the IAB node, wherein the indication information is used for triggering F1 connection establishment or migration of the sub-node of the IAB node.

Optionally, the F1 connection establishment response message carries RRC signaling;

the sending indication information to the sub-node of the IAB node includes:

and sending the RRC signaling to the child node of the IAB node, wherein the RRC signaling is used for triggering F1 connection establishment or migration of the child node.

Optionally, the sending indication information to the child node of the IAB node includes:

and sending a Backhaul Adaptation Protocol (BAP) layer signaling to the child node of the IAB node, wherein the Backhaul Adaptation Protocol (BAP) layer signaling is used for triggering F1 connection establishment or migration of the child node.

receiving F1 interface signaling sent by the target host;

and sending the F1 interface signaling to the child node of the IAB node, wherein the F1 interface signaling is used for triggering F1 connection establishment or migration of the child node.

Optionally, the IAB node includes a top-level migration node or a non-top-level migration node.

Optionally, the IAB node is a top-level migration node that switches to the target host;

Before the sending the F1 connection establishment request to the target host, the method further includes:

receiving an RRC reconfiguration message sent by a source host, wherein the RRC reconfiguration message is carried in a switching response sent by the target host to the source host, and the RRC reconfiguration message carries configuration parameters of the IAB node; the source host is the host before the IAB node is switched;

and reconfiguring the IAB node according to the configuration parameters of the IAB node.

Optionally, the RRC reconfiguration message further carries a global cell identity CGI of the target home lower access node;

after the reconfiguration of the IAB node according to the configuration parameters of the IAB node, the method further includes:

and carrying out a random access process according to the CGI of the access node under the target host.

Optionally, the RRC reconfiguration message further carries information of a default channel and a default route between the target host and the IAB node;

the sending the F1 connection establishment request to the target host includes:

and adopting the default channel and the default route to send the F1 connection establishment request to the target host.

Optionally, the IAB node is a non-top-level migration node that switches to the target host;

receiving an RRC reconfiguration message sent by a parent node of the IAB node, wherein the RRC reconfiguration message is carried in a switching response sent by the target host to a source host, and is sent to the parent node by the source host; the source host is the host before the IAB node is switched;

reconfiguring the IAB node according to the RRC reconfiguration message;

and receiving the indication information sent by the parent node.

Optionally, after the reconfiguration of the IAB node according to the RRC reconfiguration message, the method further includes:

and sending an RRC reconfiguration complete message to the parent node, wherein the RRC reconfiguration complete message is used for sending the RRC reconfiguration complete message to the target host through an F1 connection between the parent node and the target host.

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

According to another aspect of the present disclosure, there is provided a connection establishment method, which is applied to a target host, the method comprising:

Receiving an F1 connection establishment request of an access backhaul integrated IAB node, wherein the target host is the host to which the IAB node is to be switched; the F1 connection establishment request is configured to request establishment of an F1 connection between the IAB node and the target host;

and sending F1 connection establishment success indication and indication information to the IAB node, wherein the indication information is used for triggering F1 connection establishment or migration of the child node of the IAB node.

Optionally, the sending the F1 connection establishment success indication and the indication information to the IAB node includes:

f1 connection establishment response information is sent to the IAB node and used for indicating that the IAB node F1 connection establishment is successful;

the F1 connection establishment response message carries RRC signaling, and is used for triggering F1 connection establishment or migration of the child node of the IAB node.

and F1 interface signaling is sent to the IAB node and used for triggering F1 connection establishment or migration of the child node of the IAB node.

Optionally, before receiving the F1 connection establishment request of the access backhaul integrated IAB node, the method further includes:

receiving a switching request sent by the source host, wherein the source host is the host before the IAB node is switched;

and sending a switching response to the source host, wherein the switching response carries an RRC reconfiguration message of the IAB node and is used for reconfiguring the IAB node.

the method further comprises the following steps:

and receiving an RRC reconfiguration completion message sent by the IAB node, wherein the RRC reconfiguration completion message is a message sent after the IAB node is reconfigured according to the RRC reconfiguration message.

the method further comprises the following steps:

and receiving an RRC reconfiguration completion message sent by a parent node of the IAB node, wherein the RRC reconfiguration completion message is sent to the parent node after the IAB node is reconfigured according to the RRC reconfiguration message, and the parent node is sent through an F1 connection with the target host.

Optionally, the number of the IAB nodes is multiple, and the number of the RRC reconfiguration messages is multiple;

the switching response carries an RRC reconfiguration message sequence, and the switching response is used for sequentially sending a plurality of RRC reconfiguration messages according to the RRC reconfiguration message sequence.

Optionally, before sending the handover response to the source host, the method further includes:

determining a number of node hops between a plurality of the IAB nodes and the target host;

and ascending order is carried out on the RRC reconfiguration messages of the plurality of IAB nodes according to the hop count of the nodes, and the RRC reconfiguration message sequence is obtained.

and ordering the RRC reconfiguration messages of the plurality of IAB nodes in a descending order according to the hop count of the nodes to obtain the RRC reconfiguration message sequence.

According to another aspect of the present application, there is provided an access backhaul integrated IAB node, the IAB node including 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 sending indication information to the sub-node of the IAB node includes:

receiving F1 interface signaling sent by the target host;

reconfiguring the IAB node according to the RRC reconfiguration message;

and receiving the indication information sent by the parent node.

According to another aspect of the present application, there is provided a target host comprising a memory, a transceiver, and a processor:

the processor also performs the following:

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

a sending unit, configured to send an F1 connection establishment request to a target host, where the F1 connection establishment request is used to request establishment of an F1 connection between the IAB node and the target host; the target host is the host to which the IAB node is to be switched;

a receiving unit, configured to receive an F1 connection establishment response message sent by the target host;

the sending unit is further configured to send indication information to a child node of the IAB node, where the indication information is used to trigger F1 connection establishment or migration of the child node of the IAB node.

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

the receiving unit is used for receiving an F1 connection establishment request of the access backhaul integrated IAB node, wherein the target host is the host to which the IAB node is to be switched; the F1 connection establishment request is configured to request establishment of an F1 connection between the IAB node and the target host;

And the sending unit is used for sending an F1 connection establishment success indication and indication information to the IAB node, wherein the indication information is used for triggering F1 connection establishment or migration of the child node of the IAB node.

According to another aspect of the present application, there is provided a processor-readable storage medium, wherein the processor-readable storage medium stores a computer program for causing the processor to perform a connection establishment method for accessing a backhaul integrated IAB node or a connection establishment method for a target host.

The application has the following technical effects:

sending an F1 connection establishment request to a target host, wherein the F1 connection establishment request is used for requesting to establish an F1 connection between the IAB node and the target host; the target host is the host to which the IAB node is to be switched; receiving an F1 connection establishment response message sent by the target host; and sending indication information to the sub-node of the IAB node, wherein the indication information is used for triggering F1 connection establishment or migration of the sub-node of the IAB node. Therefore, after the F1 connection is successfully established, the IAB node can send indication information to the child node for triggering the F1 connection establishment or migration of the child node, so that the IAB node and the descendant node thereof establish new F1 connection or migration with a target host.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the disclosure, nor is it intended to be used to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following specification.

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 flow chart of a connection establishment method according to an embodiment of the present application;

fig. 2 is a flow chart of another connection establishment method according to an embodiment of the present application;

FIG. 3 is a schematic diagram of the relationship between an IAB node and a source host prior to a handover;

FIG. 4 is a schematic diagram of the relationship between an IAB node and a target host after handover;

FIG. 5 is a signaling interaction diagram of an IAB node, a source host, and a target host, under an embodiment;

FIG. 6 is a signaling interaction diagram of an IAB node, a source host, and a target host in accordance with another embodiment;

FIG. 7 is a signaling interaction diagram of an IAB node, a source host, and a target host in accordance with another embodiment;

fig. 8 is a signaling interaction diagram of an IAB node, a source host, and a target host in another embodiment;

fig. 9 is a schematic structural diagram of an IAB node according to an embodiment of the present application;

FIG. 10 is a schematic diagram of a target host according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a connection establishment apparatus according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a connection establishment apparatus 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.

In the embodiment of the application, the term "and/or" describes the association relation of the association objects, which means that three relations can exist, for example, a and/or B can be expressed as follows: 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.

Related art relates to intra-host migration of IAB nodes. Intra-host migration refers to the switching of an IAB node and its descendant nodes from one distributed unit of a host to another distributed unit, without involving the switching of the host and without involving the establishment of a new F1 connection. When inter-host migration needs to be performed on the IAB node, the IAB node and its descendant nodes need to establish a new F1 connection with the target host, however, in the related art, how the IAB node and its descendant nodes establish a new F1 connection with the target host is not involved.

In order to solve the above problems, embodiments of the present application provide a connection establishment method, device, apparatus, and storage medium. Sending an F1 connection establishment request to a target host, wherein the F1 connection establishment request is used for requesting to establish an F1 connection between the IAB node and the target host; the target host is the host to which the IAB node is to be switched; receiving an F1 connection establishment response message sent by the target host; and sending indication information to the sub-node of the IAB node, wherein the indication information is used for triggering F1 connection establishment or migration of the sub-node of the IAB node. Therefore, after the F1 connection is successfully established, the IAB node can send indication information to the child node to trigger the F1 connection establishment or migration of the child node, so that the IAB node and the descendant node thereof establish new F1 connection or migration with a target host.

The connection establishment method, apparatus, device, and 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. The various systems comprise a terminal device and a network side device. 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. 1 is a flow chart of a connection establishment method according to an embodiment of the present application, where the information processing method is applied to an access backhaul integrated (Integrated Access and Backhaul, IAB) node.

As shown in fig. 1, the method includes:

step 11, an F1 connection establishment request is sent to a target host, wherein the F1 connection establishment request is used for requesting to establish an F1 connection between an IAB node and the target host; the target host is the host to which the IAB node is to be handed over.

The IAB node in the embodiment of the application comprises a top-level migration node or a non-top-level migration node which is switched from a source host to a target host; the top-level migration node is a node with the least node hops between the source host and the target host in the IAB nodes which need to be switched from the source host, and the parent node of the IAB nodes does not need to be subjected to host switching. The non-top-level migration node is a descendant node of the top-level migration node.

In some exemplary embodiments, the IAB node may be a top level migration node that switches to the target host. In this exemplary embodiment, prior to step 11, the IAB node may perform the steps of: receiving an RRC reconfiguration message sent by a source host, wherein the RRC reconfiguration message is carried in a switching response sent by a target host to the source host, and the RRC reconfiguration message carries configuration parameters of an IAB node; the source host is the host before the IAB node is switched; and reconfiguring the IAB node according to the configuration parameters of the IAB node.

In the above exemplary embodiment, the IAB node is a top-level migration node that switches to the target host, and after performing the reconfiguration, the IAB node may send an F1 connection establishment request to the target host to establish an F1 connection with the target host.

In the above exemplary embodiment, the RRC reconfiguration message also carries information of a default channel and a default route between the target host and the IAB node. In a first implementation scenario, after the reconfiguration, the IAB node may send an RRC reconfiguration complete message to the target host using a default channel and a default route, and send the RRC reconfiguration complete message of the IAB node to the target host in time. Wherein the default channel is a default backhaul radio link control (Backhaul Radio Link Control, BH RLC) channel; the default route is a default backhaul adaptation protocol (Backhaul Adaptation Protocol, BAP) identification route. In a second implementation scenario, after the reconfiguration, if the F1 connection establishment between the IAB node and the target host is successful, an RRC reconfiguration complete message is sent to the target host over the F1 connection.

In the above exemplary embodiment, the RRC reconfiguration message also carries the global cell identity (Cell Global Identifier, CGI) of the target home access node. Correspondingly, after the IAB node reconfigures the IAB node according to the configuration parameters of the IAB node, the following steps may be further performed: and performing a random access process according to the CGI of the access node under the target host. After the random access is completed, the default channel between the IAB node and the target host is communicated, so that the IAB node can send an F1 connection establishment request to the target host by adopting the default channel and the default route.

In the above exemplary embodiment, the configuration parameter of the IAB node carries the target global cell identifier CGI reassigned by the target host to the IAB node, and in the random access process, the random access request sent by the IAB node to the access node carries the target CGI of the IAB node, so that the access node knows the target CGI of the IAB node.

In other exemplary embodiments, the IAB node may be a non-top level migration node that switches to the target host. In this exemplary embodiment, prior to step 11, the IAB node may perform the steps of: receiving an RRC reconfiguration message sent by a parent node of an IAB node, wherein the RRC reconfiguration message is carried in a switching response sent by a target host to a source host and is sent to the parent node by the source host; the source host is the host before the IAB node is switched; reconfiguring the IAB node according to the RRC reconfiguration message; and receiving the indication information sent by the parent node.

In the above exemplary embodiment, the IAB node is a top-level migration node that switches to the target host, and after reconfiguration, needs to wait for the indication information sent by the parent node. After receiving the indication information sent by the parent node, determining that the F1 connection establishment of the parent node is completed, so that an F1 connection establishment request can be sent to the target host to establish the F1 connection with the target host.

In the above exemplary embodiment, the RRC reconfiguration message further carries information of a default channel and a default route between the target host and the IAB node; after reconfiguration is performed and indication information sent by the parent node is received, default channel communication between the IAB node and the target host is determined, so that the IAB node can send an F1 connection establishment request to the target host by adopting the default channel and the default route.

In the above exemplary embodiment, after the reconfiguration is performed, an RRC reconfiguration complete message is sent to the parent node for sending the RRC reconfiguration complete message to the target host through the F1 connection between the parent node and the target host.

And step 12, receiving an F1 connection establishment response message sent by the target host.

And step 13, sending indication information to the sub-node of the IAB node, wherein the indication information is used for triggering F1 connection establishment or migration of the sub-node of the IAB node.

In some exemplary embodiments, the F1 connection setup response message carries RRC signaling. Correspondingly, the IAB node may specifically perform the process of step 13 by sending the RRC signaling to the child node of the IAB node, where the RRC signaling is used to trigger the F1 connection establishment or migration of the child node.

In the above exemplary embodiments, when the target host sends the F1 connection establishment response message to the IAB node, the sub-node of the IAB node may not have been reconfigured yet because the F1 connection has not been established between the sub-node of the IAB node and the target host, and therefore, RRC signaling needs to be sent to the sub-node through the IAB node. Wherein the IAB node may send RRC signaling to the child node over the Uu interface with the child node.

In other exemplary embodiments, the IAB node may specifically perform the procedure of step 13 by sending back adaptation protocol BAP layer signaling to the child node of the IAB node, to trigger the F1 connection establishment or migration of the child node.

In other exemplary embodiments, the IAB node may specifically perform the procedure of step 13 by receiving the F1 interface signaling sent by the target host; and F1 interface signaling is sent to the sub-node of the IAB node and used for triggering F1 connection establishment or migration of the sub-node.

In the above exemplary embodiment, after the F1 connection of the IAB node is established successfully, the target host may send an F1 interface signaling to the IAB node through the F1 connection with the IAB node, and the IAB node sends the F1 interface signaling to the child node through the Uu interface with the child node, so as to trigger the F1 connection establishment or migration of the child node.

In the above exemplary embodiment, triggering the F1 connection establishment of the child node refers to switching the child node from the source host to the target host in an inter-host switching (inter-CU) scenario, where a new F1 connection needs to be established with the target host, and after receiving the indication information, the child node sends an F1 connection establishment request to the target host. Triggering the F1 connection migration of the child node, namely, in the intra-host switching (intra-CU) scene, the child node is switched from one distributed unit to another distributed unit of the same host, and the child node is unchanged from the F1 connection of the host, but needs to migrate from one distributed unit to another distributed unit.

The embodiment of the application provides a connection establishment method, which is characterized by sending an F1 connection establishment request to a target host, wherein the F1 connection establishment request is used for requesting to establish F1 connection between an IAB node and the target host; the target host is the host to which the IAB node is to be switched; receiving an F1 connection establishment response message sent by the target host; and sending indication information to the sub-node of the IAB node, wherein the indication information is used for triggering F1 connection establishment or migration of the sub-node of the IAB node. Therefore, after the F1 connection is successfully established, the IAB node can send indication information to the child node for triggering the F1 connection establishment or migration of the child node, so that the IAB node and the descendant node thereof establish new F1 connection or migration with a target host.

Fig. 2 is a flow chart of another connection establishment method according to an embodiment of the present application. The method is applied to a target host.

As shown in fig. 2, the connection establishment method may include:

step 21, receiving an F1 connection establishment request of an access backhaul integrated IAB node, wherein the target host is the host to which the IAB node is to be switched; and F1 connection establishment request is used for requesting to establish F1 connection between the IAB node and the target host.

In some exemplary embodiments, the IAB node may be a top level migration node that switches to the target host. In this exemplary embodiment, the target host may also perform the following steps: and receiving an RRC reconfiguration completion message sent by the IAB node, wherein the RRC reconfiguration completion message is a message sent after the IAB node performs reconfiguration according to the RRC reconfiguration message.

In the above exemplary embodiment, the RRC reconfiguration message carries the configuration parameters of the IAB node, and information of the default channel and the default route between the target host and the IAB node. The configuration parameters of the IAB node are used for reconfiguring the IAB node. In a first implementation scenario, using a default channel and a default route between the target host and the IAB node, the target host may receive an RRC reconfiguration complete message sent by the IAB node, receive an F1 connection establishment request sent by the IAB node, and send an F1 connection establishment response message to the IAB node. In a second implementation scenario, a default channel and a default route between the target host and the IAB node are adopted, the target host may receive an F1 connection establishment request sent by the IAB node, send an F1 connection establishment response message to the IAB node, and receive, through the F1 connection, an RRC reconfiguration complete message sent by the IAB node after the F1 connection is established successfully.

In other exemplary embodiments, the IAB node may be a non-top level migration node that switches to the target host. In this exemplary embodiment, the target host may also perform the following steps: and receiving an RRC reconfiguration completion message sent by a parent node of the IAB node, wherein the RRC reconfiguration completion message is sent to the parent node after the IAB node is reconfigured according to the RRC reconfiguration message, and the parent node is sent through an F1 connection with a target host.

In the above exemplary embodiment, the RRC reconfiguration message carries the configuration parameters of the IAB node, and information of the default channel and the default route between the target host and the IAB node. The configuration parameters of the IAB node are used for reconfiguring the IAB node; the target host may receive an F1 connection establishment request sent by the IAB node and send an F1 connection establishment response message to the IAB node using a default channel and a default route between the target host and the IAB node.

Step 22, sending an F1 connection establishment success indication and indication information to the IAB node, where the indication information is used to trigger F1 connection establishment or migration of the sub-node of the IAB node.

In some exemplary embodiments, the target host may specifically perform the procedure of step 22 by sending an F1 connection establishment response message to the IAB node, to indicate that the IAB node F1 connection establishment is successful; the F1 connection establishment response message carries RRC signaling and is used for triggering F1 connection establishment or migration of the child node of the IAB node.

In other exemplary embodiments, the target host may specifically perform the procedure of step 22 by sending an F1 connection establishment response message to the IAB node, to indicate that the IAB node F1 connection establishment is successful; and F1 interface signaling is sent to the IAB node and used for triggering F1 connection establishment or migration of the child node of the IAB node.

In the above exemplary embodiment, in the inter-host handover (inter-CU) scenario, the F1 connection establishment of the child node is triggered, which means that the child node is handed over from the source host to the target host, needs to establish a new F1 connection with the target host, and after receiving the indication information, the child node sends an F1 connection establishment request to the target host. Under the inter-host switching scenario, F1 connection migration of the child node is triggered, namely, an F1 connection request between the child node and a source host is migrated to a position between the child node and a target host. In intra-hosting handover (intra-CU) scenarios, the F1 connection migration of a child node is triggered, which means that the child node is switched from one distributed unit to another distributed unit of the same host, and the child node is not changed from the F1 connection of the host, but needs to migrate from one distributed unit to another distributed unit.

In some exemplary embodiments, prior to step 21, the target host may also perform the following steps: receiving a switching request sent by a source host, wherein the source host is a host before IAB node switching; and sending a switching response to the source host, wherein the switching response carries an RRC reconfiguration message of the IAB node and is used for reconfiguring the IAB node.

In the above exemplary embodiment, the handover request carries any one or more of the following information: (1) Context information of the top-level migration node and its descendant nodes; (2) Context information of User Equipment (UE) under the top-level migration node and context information of User Equipment (UE) under the descendant node; (3) Topology information between top-level migration nodes and its descendants. The switching response carries: the method comprises the steps of RRC reconfiguration information of a top-layer migration node, RRC reconfiguration information of descendant nodes of the top-layer migration node, and RRC reconfiguration information of User Equipment (UE) under the descendant nodes.

The UE in the embodiment of the present application may be a terminal device that provides voice and/or data connectivity for a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem, etc. 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 the above exemplary embodiments, the number of the IAB nodes is plural, and the number of the RRC reconfiguration messages is plural; the switching response carries an RRC reconfiguration message sequence, and the switching response is used for sequentially sending a plurality of RRC reconfiguration messages according to the RRC reconfiguration message sequence.

In the above exemplary embodiment, in the first implementation scenario, before sending the handover response to the source host, the target host may further perform the following steps: determining a number of node hops between a plurality of IAB nodes and the target host; and ascending order is carried out on the RRC reconfiguration messages of the plurality of IAB nodes according to the hop count of the nodes, so as to obtain an RRC reconfiguration message sequence. In a second implementation scenario, the target host may also perform the following steps before sending the handover response to the source host: determining a node hop count between a plurality of IAB nodes and a target host; and descending order sorting is carried out on the RRC reconfiguration messages of the plurality of IAB nodes according to the hop count of the nodes, so as to obtain an RRC reconfiguration message sequence.

In the above exemplary embodiment, the ascending sort refers to that the IAB node with a smaller number of hops is sorted before, and the IAB node with a larger number of hops is sorted after, so that an RRC reconfiguration message can be sent to the IAB node with a smaller number of hops first, and then an RRC reconfiguration message can be sent to the IAB node with a larger number of hops, where the number of hops between the top-level migration node and the target host is the smallest, so that reconfiguration and F1 connection establishment can be performed on the IAB node with a smaller number of hops in time. The node hop count refers to the number of nodes that need to be hopped from the IAB node to the target host. For example, if the IAB nodes under the target host are, in order, IAB node 2, IAB node 4, IAB node 5, IAB node 6, and IAB node 7, the node hop count between IAB node 4 and the target host is 2, the node hop count between IAB node 2 and the target host is 1, and the node hop count between IAB node 5 and the target host is 3.

In the above exemplary embodiment, the descending order refers to that the IAB nodes with more hops are ordered before, and the IAB nodes with less hops are ordered after, so that an RRC reconfiguration message can be sent to the IAB nodes with more hops first, and then an RRC reconfiguration message can be sent to the IAB nodes with less hops, where the hop count of the node between the top-level migration node and the target host is the smallest, so that after the F1 connection of the top-level migration node is successfully established, the F1 connection can be established in time for the offspring nodes, and the total time consumed for F1 connection establishment of each IAB node is shortened.

The connection establishment method of the embodiment of the application receives the F1 connection establishment request of the access backhaul integrated IAB node, wherein the target host is the host to which the IAB node is to be switched; an F1 connection establishment request for requesting establishment of an F1 connection between the IAB node and the target host; and sending F1 connection establishment success indication and indication information to the IAB node, wherein the indication information is used for triggering F1 connection establishment or migration of the child node of the IAB node. Therefore, after the F1 connection of the IAB node is successfully established, indication information can be sent to the child node of the IAB node, the F1 connection establishment or migration of the child node is triggered, and the IAB node and the descendant node thereof establish new F1 connection or migration with a target host.

In the embodiment of the present application, the relationship among the node, the source host and the target host in the connection establishment process is described by a schematic diagram of the relationship between the pre-handover IAB node and the source host shown in fig. 3 and a schematic diagram of the relationship between the post-handover IAB node and the target host shown in fig. 4. Among these hosts are IAB host centralized units (IAB donor CU, IAB donor Centralized Unit) and IAB host distributed units (IAB donor DU, IAB donor Distributed Unit). Multiple IAB donor DUs may be concatenated under one IAB donor CU.

The IAB node includes an IAB node distributed unit (IAB node Distributed Unit, IAB node DU) and an IAB node mobile terminal (IAB node Mobile Termination, IAB node MT). Wherein, the IAB node DU is connected to the IAB donor CU through the F1 interface, and the IAB node MT is connected to the IAB node DU of the next layer through the Uu interface. If a user equipment UE is connected under a certain IAB node, the IAB node DU is connected to the UE.

In fig. 3, the CU on the left represents the source-hosting centralized unit, and the first DU on the left represents the source-hosting distributed unit. The first group MT and DU on the left are the mobile terminal and the distributed unit of the IAB node 1 under the source hosting respectively; the second set of MT and DU on the left are the mobile terminal and the distributed unit, respectively, of the source hosting lower IAB node 3; the third group MT and DU are mobile terminals and distributed units of the IAB node 5 under the source host before handover; the fourth group MT and DU are mobile terminals and distributed units of the IAB node 6 under the source host before handover; the fifth group MT and DU are mobile terminals and distributed units of the IAB node 7 under the source host before handover; the UE represents a user terminal under the pre-handover node 7.

The CU on the right represents the target hosting centralized unit. The first DU on the right represents the target host distributed unit. The first MT and DU on the right are the mobile terminal and the distributed unit of IAB node 2 under the target host respectively; the second set of MTs and DUs on the right are the mobile terminal and the distributed unit, respectively, of the IAB node 4 under the target host.

Wherein the IAB node 5 is a top-level migration node that switches from a source host to a target host. IAB node 6 and IAB node 7 are descendant nodes of IAB node 5. In the diagrams shown in fig. 3 and 4, the IAB nodes 5, 6, 7 and UE are IAB nodes and devices to be migrated to the target host.

The IAB node according to the embodiment of the present application is a network side device, and may be a base station, where the base station may include a plurality of cells for providing services for a terminal. A base station may also be called an access point or may be a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or other names, depending on the particular application. The network side device may be configured to exchange received air frames with internet protocol (Internet Protocol, IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network side device may also coordinate attribute management for the air interface. For example, the network side device according to the embodiment of the present application may be a network side device (Base Transceiver Station, BTS) in a global system for mobile communications (Global System for Mobile communications, GSM) or code division multiple access (Code Division Multiple Access, CDMA), a network side device (NodeB) in a wideband code division multiple access (Wide-band Code Division Multiple Access, WCDMA), an evolved network side device (evolutional Node B, eNB or e-NodeB) in a long term evolution (long term evolution, LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), a home evolved base station (Home evolved Node B, heNB), a relay node (relay node), a home base station (femto), a pico base station (pico), and the like. In some network structures, the network-side device may include a Centralized Unit (CU) node and a Distributed Unit (DU) node, which may also be geographically separated.

In some exemplary embodiments, the RRC signaling triggering the F1 connection establishment or migration of the child node is carried in the F1 connection establishment response message, or is sent by the IAB node to the child node through BAP layer signaling, and the source host starts sending the RRC reconfiguration message from the UE with the largest hop count. As shown in fig. 5, a signaling interaction diagram of the IAB node, the source host, and the target host in the implementation of the foregoing embodiment includes the following steps:

step 1, the source host sends a handover request (Xn handover request) to the target host requesting that the IAB node 5, and its following descendants and UEs, be migrated to the IAB DONOR CU2 (representing the target host).

Wherein the source host is represented in fig. 5 by IAB DONOR CU 1.

Step 2, the target host sends a handover response (Xn handover request ACK) to the source host, carrying RRC reconfiguration messages for each IAB node and UE.

Step 3, the source host sends an RRC reconfiguration message of the UE to the distributed units of the IAB node 7 (RRC reconfiguration), and the IAB node 7 sends the RRC reconfiguration message of the UE to the UE through the Uu interface.

Step 4, the UE sends an RRC reconfiguration complete message of the UE to the IAB node 7 (RRC reconfiguration complete).

In step 5, the source host sends an RRC reconfiguration message of the IAB node 7 to the distributed units of the IAB node 6, and the IAB node 6 sends the RRC reconfiguration message of the IAB node 7 to the IAB node 7 through the Uu interface.

In step 6, the IAB node 7 sends an RRC reconfiguration complete message of the IAB node 7 to the IAB node 6.

In step 7, the source host sends an RRC reconfiguration message of the IAB node 6 to the distributed units of the IAB node 5, and the IAB node 5 sends the RRC reconfiguration message of the IAB node 6 to the IAB node 6 through the Uu interface.

In step 8, the IAB node 6 sends an RRC reconfiguration complete message of the IAB node 6 to the IAB node 5.

In step 9, the source host sends an RRC reconfiguration message of the IAB node 5 to the distributed units of the IAB node 5.

At step 10, the IAB node 5 randomly accesses to an access node (IAB node 4 under the target home).

In step 11, the iab node 5 sends an RRC reconfiguration complete message to the target host through the default channel and the default route in the RRC reconfiguration message.

In step 12, the iab node 5 sends an F1 connection establishment request (F1 setup request) to the target host.

In step 13, the target host sends an F1 connection establishment response message (F1 setup response) to the IAB node 5, carrying the RRC signaling of the IAB node 6.

In step 14, the IAB node 5 sends RRC signaling to the IAB node 6 to instruct the IAB node 6 to perform F1 connection establishment.

In the embodiment of the present application, step 13 and step 14 may be replaced by step 13 'and step 14' in fig. 5. Step 13' is an F1 connection setup response message without carrying RRC signaling; step 14' is the IAB node 5 sending BAP layer signaling to the IAB node 6 for instructing the IAB node 6 to perform F1 connection establishment.

In step 15, the iab node 6 sends an F1 connection establishment request to the target host.

In step 16, the target host sends an F1 connection setup response message to the IAB node 6, which carries the RRC signaling of the IAB node 7.

In step 17, the IAB node 6 sends RRC signaling to the IAB node 7 to instruct the IAB node 7 to perform F1 connection establishment.

In the embodiment of the present application, step 16 and step 17 may be replaced by step 16 'and step 17' in fig. 5. Step 16' is an F1 connection setup response message without carrying RRC signaling; step 17' is the IAB node 6 sending BAP layer signaling to the IAB node 7 for instructing the IAB node 7 to perform F1 connection establishment.

In step 18, the iab node 7 sends an F1 connection establishment request to the target host.

In step 19, the target host sends an F1 connection establishment response message to the IAB node 7.

In step 20, the iab node 7 sends an RRC reconfiguration complete message of the UE to the target host.

In step 21, the IAB node 6 sends an RRC reconfiguration complete message of the IAB node 7 to the target host.

In step 22, the IAB node 5 sends an RRC reconfiguration complete message of the IAB node 6 to the target host.

Step 21 may be placed at any position after step 16, and step 22 may be placed at any position after step 13.

In the embodiment of the application, after the F1 connection is successfully established, the IAB node can send RRC signaling to the child node according to the indication of the target host, or send BAP layer signaling to the child node according to the F1 connection establishment response message, and instruct the child node to establish F1 connection, thereby realizing that the IAB node and the descendant node thereof establish new F1 connection with the target host.

In some exemplary embodiments, the RRC signaling instructing the child node to make the F1 connection setup is carried in a connection setup response message, or sent by the IAB node to the child node through BAP layer signaling, and the source host starts sending an RRC reconfiguration message from the IAB node 5 with the least number of node hops. As shown in fig. 6, a signaling interaction diagram of the IAB node, the source host, and the target host in the implementation of the foregoing embodiment includes the following steps:

Wherein the source host is represented in fig. 6 by IAB DONOR CU 1.

Step 3, the source host sends an RRC reconfiguration message of the IAB node 5 to the distributed units of the IAB node 5.

Step 4, the IAB node 5 randomly accesses to the access node (IAB node 4 under the target home).

And step 5, the IAB node 5 sends the RRC reconfiguration complete message to the target host through a default channel and the default route in the RRC reconfiguration message.

In step 6, the source host sends an RRC reconfiguration message of the IAB node 6 to the distributed units of the IAB node 5, and the IAB node 5 sends the RRC reconfiguration message of the IAB node 6 to the IAB node 6 through the Uu interface.

In step 7, the IAB node 6 sends an RRC reconfiguration complete message of the IAB node 6 to the IAB node 5.

In step 8, the iab node 5 sends an F1 connection establishment request (F1 setup request) to the target host.

Step 9, the target host sends an F1 connection establishment response message (F1 setup response) to the IAB node 5, wherein the RRC signaling of the IAB node 6 is carried.

In step 10, the IAB node 5 sends RRC signaling to the IAB node 6 to instruct the IAB node 6 to perform F1 connection establishment.

In the embodiment of the present application, step 9 and step 10 may be replaced by step 9 'and step 10' in fig. 6. Step 9' is an F1 connection setup response message without carrying RRC signaling; step 10' is that the IAB node 5 sends BAP layer signaling to the IAB node 6 for instructing the IAB node 6 to perform F1 connection establishment.

In step 11, the source host sends an RRC reconfiguration message of the IAB node 7 to the distributed units of the IAB node 6, and the IAB node 6 sends the RRC reconfiguration message of the IAB node 7 to the IAB node 7 through the Uu interface.

In step 12, the IAB node 7 sends an RRC reconfiguration complete message of the IAB node 7 to the IAB node 6.

In step 13, the iab node 6 sends an F1 connection establishment request to the target host.

In step 14, the target host sends an F1 connection setup response message to the IAB node 6, which carries the RRC signaling of the IAB node 7.

In step 15, the IAB node 6 sends RRC signaling to the IAB node 7 to instruct the IAB node 7 to perform F1 connection establishment.

In the embodiment of the present application, step 14 and step 15 may be replaced by step 14 'and step 15' in fig. 6. Step 14' is an F1 connection setup response message without carrying RRC signaling; step 15' is the IAB node 6 sending BAP layer signaling to the IAB node 7 for instructing the IAB node 7 to perform F1 connection establishment.

In step 16, the iab node 7 sends an F1 connection establishment request to the target host.

In step 17, the target host sends an F1 connection establishment response message to the IAB node 7.

In step 18, the source host sends an RRC reconfiguration message of the UE to the distributed units of the IAB node 7 (RRC reconfiguration), and the IAB node 7 sends the RRC reconfiguration message of the UE to the UE through the Uu interface.

In step 19, the ue randomly accesses to the access node (IAB node 4 under the target home).

In step 20, the UE sends an RRC reconfiguration complete message of the UE to the IAB node 7 (RRC reconfiguration complete).

In step 21, the iab node 7 sends an RRC reconfiguration complete message of the UE to the target host.

In step 22, the IAB node 6 sends an RRC reconfiguration complete message of the IAB node 7 to the target host.

In step 23, the IAB node 5 sends an RRC reconfiguration complete message of the IAB node 6 to the target host.

Step 22 may be placed at any position after step 14, and step 23 may be placed at any position after step 9.

In some exemplary embodiments, the target host sends F1 interface signaling to the IAB node to instruct the child node of the IAB node to perform F1 connection establishment, and the source host starts sending the RRC reconfiguration message from the UE with the largest number of hops. As shown in fig. 7, a signaling interaction diagram of the IAB node, the source host, and the target host in the implementation of the foregoing embodiment includes the following steps:

Wherein the source host is represented in fig. 7 by IAB DONOR CU 1.

Step 13, the target host sends an F1 connection establishment response message (F1 setup response) to the IAB node 5.

In step 14, the target host sends an F1 interface signaling to the IAB node 6, instructing the IAB node 6 to perform F1 connection establishment.

In step 16, the target host sends an F1 connection establishment response message to the IAB node 6.

In step 17, the target host sends an F1 interface signaling to the IAB node 7, and instructs the IAB node 7 to perform F1 connection establishment.

In the embodiment of the application, after the F1 connection of the IAB node is successfully established, the target host can send the F1 interface signaling to the child node of the IAB node to instruct the child node to establish the F1 connection, thereby realizing that the IAB node and the descendant node thereof establish a new F1 connection with the target host.

In some exemplary embodiments, the target host sends F1 interface signaling to the IAB node to instruct the sub-node of the IAB node to perform F1 connection establishment, and the source host starts sending RRC reconfiguration messages from the IAB node 5 with the least number of node hops. As shown in fig. 8, a signaling interaction diagram of the IAB node, the source host, and the target host in the implementation of the foregoing embodiment includes the following steps:

Wherein the source host is represented in fig. 8 by IAB DONOR CU 1.

Step 9, the target host sends an F1 connection establishment response message (F1 setup response) to the IAB node 5.

Step 10, the target host sends an F1 interface signaling to the IAB node 6, and instructs the IAB node 6 to perform F1 connection establishment.

In step 14, the target host sends an F1 connection establishment response message to the IAB node 6.

Step 15, the target host sends an F1 interface signaling to the IAB node 7, and instructs the IAB node 7 to perform F1 connection establishment.

In step 19, the UE sends an RRC reconfiguration complete message of the UE to the IAB node 7 (RRC reconfiguration complete).

Fig. 9 is a schematic structural diagram of an access backhaul integrated IAB node according to an embodiment of the present application.

As shown in fig. 9, the IAB node is handed off from a source host to a target host, and the IAB node includes a memory 900, a transceiver 910, and a processor 920:

a transceiver 910 for receiving and transmitting data under the control of a processor 920.

Wherein in fig. 9, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 920 and various circuits of memory represented by memory 900, 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. The transceiver 910 may be a number of elements, i.e., include 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. 9, the IAB node may further include a user interface 930, and the user interface 930 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 920 is responsible for managing the bus architecture and general processing, and the memory 900 may store data used by the processor 920 in performing operations.

Alternatively, the processor 920 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 920 may also employ a multi-core architecture.

The processor 920 performs the following operations by calling a computer program stored in the memory:

Optionally, as another embodiment, the F1 connection establishment response message carries RRC signaling. The processor 920 is specifically configured to send the RRC signaling to a child node of the IAB node, and trigger F1 connection establishment or migration of the child node.

Optionally, as another embodiment, the processor 920 is specifically configured to send backhaul adaptation protocol BAP layer signaling to a child node of the IAB node, where the backhaul adaptation protocol BAP layer signaling is used to trigger F1 connection establishment or migration of the child node.

Optionally, as another embodiment, the processor 920 is specifically configured to receive F1 interface signaling sent by the target host; and sending the F1 interface signaling to the child node of the IAB node, wherein the F1 interface signaling is used for triggering F1 connection establishment or migration of the child node.

Optionally, as another embodiment, the IAB node includes a top-level migration node or a non-top-level migration node.

Alternatively, as another embodiment, the IAB node is a top-level migration node that switches to the target host. The processor 920 is further configured to receive, before sending an F1 connection establishment request to the target host, an RRC reconfiguration message sent by a source host, where the RRC reconfiguration message is carried in a handover response sent by the target host to the source host, and the RRC reconfiguration message carries a configuration parameter of the IAB node; the source host is the host before the IAB node is switched; and reconfiguring the IAB node according to the configuration parameters of the IAB node.

Optionally, as another embodiment, the RRC reconfiguration message further carries a global cell identifier CGI of the target home lower access node; the processor 920 is further configured to perform a random access procedure according to the CGI of the access node under the target host after the IAB node is reconfigured according to the configuration parameter of the IAB node.

Optionally, as another embodiment, the RRC reconfiguration message further carries information of a default channel and a default route between the target host and the IAB node; processor 920 is specifically configured to send the F1 connection establishment request to the target host using the default channel and the default route.

Alternatively, as another embodiment, the IAB node is a non-top level migration node that switches to the target host. The processor 920 is further configured to receive, before sending an F1 connection establishment request to the target host, an RRC reconfiguration message sent by a parent node of the IAB node, where the RRC reconfiguration message is carried in a handover response sent by the target host to a source host, and is sent by the source host to the parent node; the source host is the host before the IAB node is switched; reconfiguring the IAB node according to the RRC reconfiguration message; and receiving the indication information sent by the parent node.

Optionally, as another embodiment, the processor 920 is further configured to send, after reconfiguring the IAB node according to the RRC reconfiguration message, an RRC reconfiguration complete message to the parent node, for sending the RRC reconfiguration complete message to the target host through an F1 connection between the parent node and the target host.

Alternatively, as another embodiment, the default channel is a default backhaul radio link control BH RLC channel; the default route is a default backhaul adaptation protocol BAP identification route.

It should be noted that, the IAB node 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 the same parts and beneficial effects as those of the method embodiment in the embodiment are not described in detail herein.

Fig. 10 is a schematic structural diagram of a target host according to an embodiment of the present application. As shown in fig. 10, the target host may include a memory 1000, a transceiver 1010, a processor 1020,

wherein:

a transceiver 1010 for receiving and transmitting data under the control of a processor 1020.

Wherein in fig. 10, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors, represented by processor 1020, and various circuits of the memory, represented by memory 1000, are 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. The transceiver 1010 may be a number of elements, i.e., 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, and the like. The processor 1020 is responsible for managing the bus architecture and general processing, and the memory 1000 may store data used by the processor 1020 in performing operations.

The processor 1020 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 (Comple 14Programmable Logic Device, CPLD), or may employ a multi-core architecture.

The processor 1020 executes the following operations by calling a computer program stored in the memory:

Optionally, as another embodiment, the processor 1020 is specifically configured to send an F1 connection establishment response message to the IAB node, where the F1 connection establishment success of the IAB node is indicated; the F1 connection establishment response message carries RRC signaling, and is used for triggering F1 connection establishment or migration of the child node of the IAB node.

Optionally, as another embodiment, the processor 1020 is specifically configured to send an F1 connection establishment response message to the IAB node, where the F1 connection establishment success of the IAB node is indicated;

Optionally, as another embodiment, the processor 1020 is further configured to, before receiving the F1 connection establishment request of the access backhaul integrated IAB node, receive a handover request sent by the source host, where the source host is a host before the IAB node is handed over; and sending a switching response to the source host, wherein the switching response carries an RRC reconfiguration message of the IAB node and is used for reconfiguring the IAB node.

Alternatively, as another embodiment, the IAB node is a top-level migration node that switches to the target host. The processor 1020 is further configured to receive an RRC reconfiguration complete message sent by the IAB node, where the RRC reconfiguration complete message is a message sent after the IAB node performs reconfiguration according to the RRC reconfiguration message.

Alternatively, as another embodiment, the IAB node is a non-top level migration node that switches to the target host. The processor 1020 is further configured to receive an RRC reconfiguration complete message sent by a parent node of the IAB node, where the RRC reconfiguration complete message is sent to the parent node after the IAB node performs reconfiguration according to the RRC reconfiguration message, and the parent node is sent through an F1 connection with the target host.

Alternatively, as another embodiment, the number of the IAB nodes is a plurality, and the number of the RRC reconfiguration messages is a plurality; the switching response carries an RRC reconfiguration message sequence, and the switching response is used for sequentially sending a plurality of RRC reconfiguration messages according to the RRC reconfiguration message sequence.

Optionally, as another embodiment, the processor 1020 is further configured to determine a node hop count between a plurality of the IAB nodes and the target host before sending a handover response to the source host; and ascending order is carried out on the RRC reconfiguration messages of the plurality of IAB nodes according to the hop count of the nodes, and the RRC reconfiguration message sequence is obtained.

Optionally, as another embodiment, the processor 1020 is further configured to determine a node hop count between a plurality of the IAB nodes and the target host before sending a handover response to the source host; and ordering the RRC reconfiguration messages of the plurality of IAB nodes in a descending order according to the hop count of the nodes to obtain the RRC reconfiguration message sequence.

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. 11 is a schematic structural diagram of a connection establishment apparatus according to an embodiment of the present application. As shown in fig. 11, the connection establishment apparatus is applied to an access backhaul integrated IAB node, and the connection establishment apparatus 110 includes:

a sending unit 1101, configured to send an F1 connection establishment request to a target host, where the F1 connection establishment request is used to request establishment of an F1 connection between the IAB node and the target host; the target host is the host to which the IAB node is to be switched;

a receiving unit 1102, configured to receive an F1 connection establishment response message sent by the target host;

the sending unit 1101 is further configured to send indication information to a child node of the IAB node, where the indication information is used to trigger F1 connection establishment or migration of the child node of the IAB node.

Further, the F1 connection establishment response message carries RRC signaling; the sending unit 1101 is specifically configured to send the RRC signaling to a child node of the IAB node, and is configured to trigger F1 connection establishment or migration of the child node.

Further, the sending unit 1101 is specifically configured to send backhaul adaptation protocol BAP layer signaling to a child node of the IAB node, and is configured to trigger F1 connection establishment or migration of the child node.

Further, the sending unit 1101 is specifically configured to receive an F1 interface signaling sent by the target host; and sending the F1 interface signaling to the child node of the IAB node, wherein the F1 interface signaling is used for triggering F1 connection establishment or migration of the child node.

Further, the IAB node includes a top-level migration node or a non-top-level migration node.

Further, the IAB node is a top-level migration node that switches to the target host. The receiving unit 1102 is further configured to receive an RRC reconfiguration message sent by a source host, where the RRC reconfiguration message is carried in a handover response sent by the target host to the source host, and the RRC reconfiguration message carries a configuration parameter of the IAB node; the source host is the host before the IAB node is switched; and reconfiguring the IAB node according to the configuration parameters of the IAB node.

Further, the RRC reconfiguration message further carries a global cell identity CGI of the target home lower access node; the device also comprises: and the access unit performs a random access process according to the CGI of the access node under the target host.

Further, the sending unit 1101 is specifically configured to send the F1 connection establishment request to the target host by using the default channel and the default route.

Further, the IAB node is a non-top-level migration node that switches to the target host; the receiving unit 1102 is further configured to receive an RRC reconfiguration message sent by a parent node of the IAB node, where the RRC reconfiguration message is carried in a handover response sent by the target host to a source host, and is sent by the source host to the parent node; the source host is the host before the IAB node is switched; reconfiguring the IAB node according to the RRC reconfiguration message; and receiving the indication information sent by the parent node.

Further, the sending unit 1101 is further configured to send an RRC reconfiguration complete message to the parent node, and is configured to send the RRC reconfiguration complete message to the target host through an F1 connection between the parent node and the target host.

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

The connection establishment device provided by the embodiment of the application sends an F1 connection establishment request to a target host, wherein the F1 connection establishment request is used for requesting to establish F1 connection between the IAB node and the target host; the target host is the host to which the IAB node is to be switched; receiving an F1 connection establishment response message sent by the target host; and sending indication information to the sub-node of the IAB node, wherein the indication information is used for triggering F1 connection establishment or migration of the sub-node of the IAB node. Therefore, after the F1 connection is successfully established, the IAB node can send indication information to the child node for triggering the F1 connection establishment or migration of the child node, so that the IAB node and the descendant node thereof establish new F1 connection or migration with a target host.

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. 12 is a schematic structural diagram of a connection establishment apparatus according to an embodiment of the present application. As shown in fig. 12, the device is applied to the target host, and the connection establishment device 120 includes:

a receiving unit 1201, configured to receive an F1 connection establishment request of an access backhaul integrated IAB node, where the target host is a host to which the IAB node is to be switched; the F1 connection establishment request is configured to request establishment of an F1 connection between the IAB node and the target host;

a sending unit 1202, configured to send an F1 connection establishment success indication and indication information to the IAB node, where the indication information is used to trigger F1 connection establishment or migration of a child node of the IAB node.

Further, the sending unit 1202 is specifically configured to send an F1 connection establishment response message to the IAB node, where the F1 connection establishment success of the IAB node is indicated; the F1 connection establishment response message carries RRC signaling, and is used for triggering F1 connection establishment or migration of the child node of the IAB node.

Further, the sending unit 1202 is specifically configured to send an F1 connection establishment response message to the IAB node, where the F1 connection establishment success of the IAB node is indicated; and F1 interface signaling is sent to the IAB node and used for triggering F1 connection establishment or migration of the child node of the IAB node.

Further, the receiving unit 1201 is further configured to receive a handover request sent by the source host, where the source host is a host before the IAB node is handed over; and sending a switching response to the source host, wherein the switching response carries an RRC reconfiguration message of the IAB node and is used for reconfiguring the IAB node.

Further, the IAB node is a top-level migration node switched to the target host; the receiving unit 1201 is further configured to receive an RRC reconfiguration complete message sent by the IAB node, where the RRC reconfiguration complete message is a message sent after the IAB node performs reconfiguration according to the RRC reconfiguration message.

Further, the IAB node is a non-top-level migration node that switches to the target host; the receiving unit 1201 is further configured to receive an RRC reconfiguration complete message sent by a parent node of the IAB node, where the RRC reconfiguration complete message is sent to the parent node after the IAB node performs reconfiguration according to the RRC reconfiguration message, and the parent node is sent through an F1 connection with the target host.

Further, the number of the IAB nodes is a plurality, and the number of the RRC reconfiguration messages is a plurality; the switching response carries an RRC reconfiguration message sequence, and the switching response is used for sequentially sending a plurality of RRC reconfiguration messages according to the RRC reconfiguration message sequence.

Further, the device further comprises: a first determining unit configured to determine a node hop count between a plurality of the IAB nodes and the target host; and ascending order is carried out on the RRC reconfiguration messages of the plurality of IAB nodes according to the hop count of the nodes, and the RRC reconfiguration message sequence is obtained.

Further, the device further comprises: a second determining unit configured to determine a node hop count between a plurality of the IAB nodes and the target host; and ordering the RRC reconfiguration messages of the plurality of IAB nodes in a descending order according to the hop count of the nodes to obtain the RRC reconfiguration message sequence.

The connection establishment device provided by the embodiment of the application receives an F1 connection establishment request of an access backhaul integrated IAB node, wherein a target host is a host to which the IAB node is to be switched; an F1 connection establishment request for requesting establishment of an F1 connection between the IAB node and the target host; and sending F1 connection establishment success indication and indication information to the IAB node, wherein the indication information is used for triggering F1 connection establishment or migration of the child node of the IAB node. Therefore, after the F1 connection of the IAB node is successfully established, indication information can be sent to the child node of the IAB node, the F1 connection establishment or migration of the child node is triggered, and the IAB node and the descendant node thereof establish new F1 connection or migration with a target host.

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.

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 connection establishment method shown in the embodiment of fig. 1 of the present application.

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 connection establishment method shown in the embodiment of fig. 2 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 method for connection establishment, wherein the method is applied to an access backhaul integrated IAB node, the method comprising:

Sending indication information to the sub-node of the IAB node, wherein the indication information is used for triggering F1 connection establishment or migration of the sub-node of the IAB node;

the F1 connection establishment response message carries RRC signaling; the sending indication information to the sub-node of the IAB node includes: sending the RRC signaling to the child node of the IAB node, wherein the RRC signaling is used for triggering F1 connection establishment or migration of the child node;

the IAB node is a non-top-level migration node switched to the target host; before the sending the F1 connection establishment request to the target host, the method further includes: receiving an RRC reconfiguration message sent by a parent node of the IAB node, wherein the RRC reconfiguration message is carried in a switching response sent by the target host to a source host, and is sent to the parent node by the source host; the source host is the host before the IAB node is switched; reconfiguring the IAB node according to the RRC reconfiguration message; receiving indication information sent by the parent node;

the IAB node is a non-top-level migration node switched to the target host; before the sending the F1 connection establishment request to the target host, the method further includes:

The source host sends the RRC reconfiguration message of the child node to the distributed units of the IAB node, and the IAB node sends the RRC reconfiguration message of the child node to the child node through a Uu interface; the child node sends an RRC reconfiguration complete message of the child node to the IAB node;

the sending indication information to the sub-node of the IAB node includes:

transmitting a Backhaul Adaptation Protocol (BAP) layer signaling to a child node of the IAB node, wherein the BAP layer signaling is used for triggering F1 connection establishment or migration of the child node; or alternatively, the first and second heat exchangers may be,

receiving F1 interface signaling sent by the target host;

2. The connection establishment method of claim 1, wherein the IAB node comprises a top level migration node or a non-top level migration node.

3. The connection establishment method according to claim 1, wherein the IAB node is a top-level migration node handed over to the target host;

4. A connection establishment method according to claim 3, wherein said RRC reconfiguration message also carries a global cell identity CGI of said target home lower access node;

5. The connection establishment method according to claim 3, wherein the RRC reconfiguration message further carries information of a default channel and a default route between the target host and the IAB node;

6. The connection establishment method according to claim 1, wherein after the reconfiguration of the IAB node according to the RRC reconfiguration message, further comprises:

7. The connection establishment method according to claim 5, wherein the default channel is a default backhaul radio link control BH RLC channel; the default route is a default backhaul adaptation protocol BAP identification route.

8. A connection establishment method, wherein the method is applied to a target host, the method comprising:

receiving an F1 connection establishment request of an access backhaul integrated IAB node, wherein the target host is the host to which the IAB node is to be switched; the IAB node performing the connection establishment method of claim 1, the F1 connection establishment request requesting establishment of an F1 connection between the IAB node and the target host;

9. The method of connection establishment according to claim 8, wherein said sending an F1 connection establishment success indication and indication information to the IAB node comprises:

10. The method of connection establishment according to claim 8, wherein said sending an F1 connection establishment success indication and indication information to the IAB node comprises:

11. The method for connection establishment according to claim 8, wherein before receiving the F1 connection establishment request of the access backhaul integrated IAB node, further comprising:

receiving a switching request sent by a source host, wherein the source host is the host before the IAB node is switched;

12. The connection establishment method of claim 11, wherein the IAB node comprises a top level migration node or a non-top level migration node.

13. The connection establishment method according to claim 12, wherein the IAB node is a top-level migration node handed over to the target host;

the method further comprises the following steps:

14. The connection establishment method according to claim 12, wherein the IAB node is a non-top level migration node handed over to the target host;

the method further comprises the following steps:

15. The connection establishment method according to claim 11, wherein the number of the IAB nodes is plural, and the number of the RRC reconfiguration messages is plural;

16. The connection establishment method according to claim 15, wherein before said sending a handover response to said source host, further comprising:

17. The connection establishment method according to claim 15, wherein before said sending a handover response to said source host, further comprising:

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

the IAB node is a non-top-level migration node switched to the target host; before sending the F1 connection establishment request to the target host, the method includes: receiving an RRC reconfiguration message sent by a parent node of the IAB node, wherein the RRC reconfiguration message is carried in a switching response sent by the target host to a source host, and is sent to the parent node by the source host; the source host is the host before the IAB node is switched; reconfiguring the IAB node according to the RRC reconfiguration message; receiving indication information sent by the parent node;

the sending indication information to the sub-node of the IAB node includes:

receiving F1 interface signaling sent by the target host;

19. The IAB node of claim 18, wherein the IAB node comprises a top level migration node or a non-top level migration node.

20. The IAB node of claim 19, wherein the IAB node is a top level migration node to switch to the target host;

21. The IAB node of claim 20, wherein the RRC reconfiguration message further carries a global cell identity, CGI, of the target home lower access node;

22. The IAB node of claim 20, wherein the RRC reconfiguration message further carries information of a default channel and a default route between the target host and the IAB node;

23. The IAB node of claim 18, wherein the means for reconfiguring the IAB node according to the RRC reconfiguration message further comprises:

24. The IAB node of claim 22, wherein the default channel is a default backhaul radio link control, BH, RLC channel; the default route is a default backhaul adaptation protocol BAP identification route.

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

26. The target host of claim 25, wherein the sending the IAB node an F1 connection establishment success indication along with indication information comprises:

27. The target host of claim 25, wherein the sending the IAB node an F1 connection establishment success indication along with indication information comprises:

28. The target host of claim 25, wherein prior to receiving the F1 connection establishment request of the access backhaul integrated IAB node, further comprising:

29. The target host of claim 28, wherein the IAB node comprises a top-level or non-top-level migration node.

30. The target host of claim 29, wherein the IAB node is a top-level migration node that switches to the target host;

the processor also performs the following:

31. The target host of claim 29, wherein the IAB node is a non-top level migration node that switches to the target host;

the processor also performs the following:

32. The target host of claim 28, wherein the number of IAB nodes is a plurality and the number of RRC reconfiguration messages is a plurality;

33. The target host of claim 32, wherein prior to said sending a handoff response to said source host, further comprising:

34. The target host of claim 32, wherein prior to said sending a handoff response to said source host, further comprising:

35. A connection establishment apparatus, the apparatus being applied to an access backhaul integrated IAB node, the apparatus comprising:

The sending unit is further configured to send indication information to a child node of the IAB node, where the indication information is used to trigger F1 connection establishment or migration of the child node of the IAB node;

the sending indication information to the sub-node of the IAB node includes:

receiving F1 interface signaling sent by the target host;

36. A connection establishment apparatus, the apparatus being applied to a target host, the apparatus comprising:

a receiving unit, configured to receive an F1 connection establishment request of an access backhaul integrated IAB node, where the target host is a host to which the IAB node is to be switched, and the IAB node executes the connection establishment method according to claim 1; the F1 connection establishment request is configured to request establishment of an F1 connection between the IAB node and the target host;

37. 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 7 or the method of any one of claims 8 to 17.