CN114390727B

CN114390727B - Target object switching method and device, electronic equipment and network equipment

Info

Publication number: CN114390727B
Application number: CN202011141149.3A
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: 2020-10-22
Filing date: 2020-10-22
Publication date: 2024-04-26
Anticipated expiration: 2040-10-22
Also published as: CN114390727A

Abstract

The embodiment of the application provides a target object switching method and device, electronic equipment and network equipment. The target object switching method is applied to a source centralized unit, wherein the source centralized unit is a centralized unit in an source Integrated Access Backhaul (IAB) host node, and the method comprises the following steps: sending a radio resource control layer (RRC) reconfiguration message to a target object, wherein the RRC reconfiguration message is used for indicating the target object to carry out RRC reconfiguration and establishing connection with a second node; the target object is connected to the source concentration unit through a first node and connected to the target concentration unit through a second node; the target centralized unit is a centralized unit in the target IAB host node. The embodiment of the application provides a switching scheme of IAB nodes among different CUs.

Description

Target object switching method and device, electronic equipment and network equipment

Technical Field

The present application relates to the field of mobile communications technologies, and in particular, to a method and apparatus for switching a target object, an electronic device, and a network device.

Background

In the new air interface technology (5th Generation New Radio,5G NR) system of the fifth generation mobile communication technology, the peak theoretical transmission speed can reach tens of Gb (gigabytes) per second, which is hundreds of times faster than the transmission speed of long term evolution (Long Term Evolution, LTE, i.e., 4G network). The 5G NR system enables high transmission speeds in the use of millimeter waves. In particular, millimeter waves refer to electromagnetic waves having wavelengths on the order of millimeters and frequencies between about 30 gigahertz (GHz) and 300 GHz. One characteristic of the millimeter wave band is that attenuation in air is large and diffraction ability is weak. For this purpose, integrated access Backhaul Links (IAB) technology is proposed. The IAB can more flexibly deploy dense NR cell networks through a wireless backhaul link and a relay link without correspondingly increasing dense deployment of transmission networks.

With the proposal of the IAB technology, it is no longer necessary that each User Equipment (UE) is connected to a Centralized Unit (CU), and the UE only needs to be connected to the IAB nodes (nodes), and the IAB host node (node) uniformly manages the IAB nodes and directly communicates with the core network, so that the network deployment is more flexible. However, only the IAB node switching in the same CU is supported in the current 5G NR system, so that the mobility of the IAB node is limited, and the actual application cannot be satisfied. Therefore, it is desirable to provide a handover of an IAB node between different CUs to expand the range of movement of the IAB node.

Disclosure of Invention

The embodiment of the application provides a target object switching method and device, electronic equipment and network equipment, and provides a switching scheme of an IAB node among different CUs.

In a first aspect, an embodiment of the present application provides a target object switching method, which is applied to a source centralized unit, where the source centralized unit is a centralized unit in an source integrated access backhaul IAB host node, and the method includes:

sending a radio resource control layer (RRC) reconfiguration message to a target object, wherein the RRC reconfiguration message is used for indicating the target object to carry out RRC reconfiguration and establishing connection with a second node;

The target object is connected to the source concentration unit through a first node and connected to the target concentration unit through a second node; the target centralized unit is a centralized unit in the target IAB host node.

Optionally, the RRC reconfiguration message includes:

The signaling resource carries at least one of SRB configuration information, target configuration information of a target configuration item corresponding to the target object and switching indication information; the switching indication information is used for indicating the target object to switch to the second node.

Optionally, the target object includes a terminal, a third node, or a fourth node; the fourth node is a descendant node of the third node.

Optionally, if the target object includes the terminal or the fourth node, the second node is a node corresponding to the same physical IAB node as the first node; or (b)

And if the target object comprises the third node, the second node is a node corresponding to a different physical IAB node from the first node.

Optionally, if the target object includes a terminal, the target configuration item includes a data resource bearer DRB; or (b)

If the target object includes the third node or the fourth node, the target configuration item includes a backhaul radio link control layer protocol channel.

Optionally, before the sending the RRC reconfiguration message of the radio resource control layer to the target object, the method further includes:

Sending a switching request to the target centralized unit;

and receiving a switching response sent by the target centralized unit, wherein the switching response comprises the RRC reconfiguration message.

Optionally, the RRC reconfiguration message includes: node configuration information;

The node configuration information includes: backhaul Adaptation Protocol (BAP) configuration parameters of the third node or the fourth node; the BAP configuration parameters are used for configuring an RLC channel identifier ID corresponding to the BAP protocol layer connected in an access mode; the access connection is the connection between the third node or the fourth node and the second node.

In a second aspect, an embodiment of the present application further provides a target object switching method, applied to a target object, where the method includes:

Receiving a radio resource control layer (RRC) reconfiguration message sent by a source concentration unit; the source centralized unit is a centralized unit in a source integrated access backhaul IAB host node;

Performing RRC reconfiguration according to the RRC reconfiguration message, and establishing connection with a second node;

Optionally, the RRC reconfiguration message includes:

the signaling resource carries at least one of SRB configuration information, target configuration information of a target configuration item corresponding to the target object and switching indication information; the switching indication information is used for indicating the target object to be switched to the target cell corresponding to the second node.

Optionally, if the target object includes a terminal or a fourth node, the second node is a node corresponding to the same physical IAB node as the first node; or (b)

If the target object comprises a third node, the second node is a node corresponding to a different physical IAB node with the first node; the fourth node is a descendant node of the third node.

Optionally, the RRC reconfiguration message includes: SRB configuration information and target configuration information of a target configuration item corresponding to the target object;

The performing RRC reconfiguration according to the RRC reconfiguration message includes:

And establishing SRB connection with a target centralized unit according to the SRB configuration information, establishing the target configuration item connection with the target centralized unit according to the target configuration information, and releasing the SRB connection with the source centralized unit.

Optionally, the RRC reconfiguration message includes SRB configuration information;

establishing SRB connection with the target centralized unit through the second node according to the SRB configuration information;

Receiving target configuration information sent by the target concentration unit through the SRB connection, and establishing connection with a target configuration item sent by the target concentration unit according to the target configuration information;

Or (b)

And establishing target configuration item connection with the target centralized unit through random access.

Optionally, the RRC reconfiguration message includes the target configuration information;

Establishing target configuration item connection with a target centralized unit through the second node according to target configuration information;

and establishing SRB connection with the target centralized unit through random access.

Optionally, the RRC reconfiguration message includes the handover indication information, and the establishing a connection with the second node includes:

and establishing the connection between the SRB connection of the target centralized unit and the target configuration item through random access.

In a third aspect, an embodiment of the present application further provides a network device, including:

a memory, transceiver, 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 target object is connected to the source concentrating unit through a first node and connected to the target concentrating unit through the second node; the source centralized unit is a centralized unit in the source integrated access backhaul IAB host node, and the target centralized unit is a centralized unit in the target IAB host node.

Optionally, the RRC reconfiguration message includes:

Optionally, the network device is further configured to:

A switching request sending module, configured to send a switching request to the target centralized unit;

and the switching response receiving module is used for receiving a switching response sent by the target centralized unit, wherein the switching response comprises the RRC reconfiguration message.

In a fourth aspect, an embodiment of the present application further provides an electronic device, including: a memory, transceiver, processor;

a memory for storing a computer program;

a transceiver for transceiving data under control of the processor;

The control target object receives a radio resource control layer (RRC) reconfiguration message sent by the source concentration unit; the source centralized unit is a centralized unit in a source integrated access backhaul IAB host node;

Optionally, the RRC reconfiguration message includes:

Or (b)

In a fifth aspect, an embodiment of the present application further provides a target object switching device, which is applied to a source centralized unit, where the source centralized unit is a centralized unit in an source integrated access backhaul IAB host node, and the device includes:

The message sending module is used for sending a radio resource control layer (RRC) reconfiguration message to the target object, wherein the RRC reconfiguration message is used for indicating the target object to carry out RRC reconfiguration and establishing connection with the second node;

In a sixth aspect, an embodiment of the present application further provides a target object switching apparatus, applied to a target object, where the apparatus includes:

the message receiving module is used for receiving the RRC reconfiguration message of the radio resource control layer sent by the source concentration unit; the source centralized unit is a centralized unit in a source integrated access backhaul IAB host node;

The connection establishment module is used for carrying out RRC reconfiguration according to the RRC reconfiguration message and establishing connection with the second node;

In a seventh aspect, an embodiment of the present application further provides an electronic device, where the electronic device includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor implements the steps in the target object switching method as described above when executing the computer program.

In an eighth aspect, embodiments of the present application further provide a processor-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the target object switching method as described above.

In the embodiment of the application, a source centralized unit sends a radio resource control layer (RRC) reconfiguration message to a target object; the target object receives the RRC reconfiguration message sent by the source concentration unit, carries out RRC reconfiguration according to the RRC reconfiguration message, establishes connection with the second node, and realizes the switching of the IAB node among different CUs so as to enlarge the moving range of the IAB node, meet the actual application requirement and avoid the limitation of the switching of the target object to limit the mobility of the IAB node.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 shows one of the flowcharts of the target object switching method according to the embodiment of the present application;

FIG. 2 is a second flowchart of a target object switching method according to an embodiment of the application;

FIG. 3 shows a schematic diagram of a first example of an embodiment of the application;

FIG. 4 shows a schematic diagram of a second example of an embodiment of the application;

FIG. 5 shows a schematic diagram of a third example of an embodiment of the application;

FIG. 6 shows a schematic diagram of a fourth example of an embodiment of the application;

FIG. 7 is a block diagram of a target object switching device according to an embodiment of the present application;

FIG. 8 is a second block diagram of a target object switching device according to an embodiment of the present application;

Fig. 9 is a block diagram of a network device according to an embodiment of the present application;

fig. 10 is a block diagram of an electronic device according to an embodiment of the present application.

Detailed Description

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.

The term "plurality" in embodiments of the present application means two or more, and other adjectives are similar.

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.

The embodiment of the application provides a target object switching method and device, electronic equipment and network equipment, which are used for realizing switching of IAB nodes among CUs.

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.

In addition, the technical scheme provided by the embodiment of the application can be suitable for various systems, especially 5G systems. For example, applicable 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) systems, and the like. Terminal devices and network devices are included in these various systems. Core network parts may also be included in the system, such as Evolved packet system (Evolved PACKET SYSTEM, EPS), 5G system (5 GS), etc.

The terminal device according to the embodiment of the present application may be a device that provides voice and/or data connectivity to 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, PDA) 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 station), 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.

The network device according to the embodiment of the present application may be a base station, where the base station may include a plurality of cells for providing services for the 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 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 device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a network 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 device (NodeB) in a wideband code division multiple access (Wide-band Code Division Multiple Access, WCDMA), an evolved network 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), etc., which are not limited in the embodiment of the present application. In some network structures, the network devices may include centralized unit (centralized unit, CU) nodes and Distributed Unit (DU) nodes, which may also be geographically separated.

Multiple-input Multiple-output (Multi Input Multi Output, MIMO) transmissions may be made between the network device and the terminal device, each using one or more antennas, and the MIMO transmissions may be Single User MIMO (SU-MIMO) or Multiple User MIMO (MU-MIMO). The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or may be diversity transmission, precoding transmission, beamforming transmission, or the like, depending on the form and number of the root antenna combinations.

Fig. 1 and fig. 2 respectively show a flow chart of a target object switching method according to an embodiment of the present application.

As shown in fig. 1, the target object switching method applied to the centralized unit in the source integrated access backhaul IAB host node includes:

Step 101, a radio resource control layer RRC reconfiguration message is sent to a target object, where the RRC reconfiguration message is used to instruct the target object to perform RRC reconfiguration, and establish connection with a second node.

IABs are generally classified into IAB host nodes (donor) and IAB nodes (IAB nodes); the IAB node is an access node supporting wireless access of the UE and carrying out wireless backhaul on data; the IAB node provides a wireless backhaul function for the IAB node so that the UE is connected with an access node of the core network;

wherein, IAB donor is gNB supporting IAB function; the IAB node includes an IAB DU part supporting gNB-DU functions and an IAB MT (Mobile Termination) supporting part of UE functions. As a first example, as shown in fig. 3, the IAB host nodes are shown as IAB donor1 and IAB donor 2; IAB nodes are shown as IAB node3 and IAB node 4.

Wherein the target object is an object for performing IAB switching (or migration);

Optionally, in an embodiment of the present application, the target object includes a terminal, a third node, or a fourth node; the fourth node is a descendant node of the third node. Referring to fig. 3, the third node may be IAB node5 (IAB node5a or IAB node5b, both of which are the same physical IAB node); the third node is a parent node switched in the IAB switching; for example, if the target object is a terminal or a descendant node, the third node is a first node connected with the terminal or the descendant node; if the target object is the third node, the first node is the third node. The fourth node is a descendant node of the third node. Fig. 3 illustrates the UE as a target object, and it may be understood that the UE in fig. 3 may also be a third node and its descendant nodes.

The target object is connected to the source concentration unit through a first node and connected to the target concentration unit through a second node; the first node is a source access node, and the second node is a target access node; the target centralized unit is a centralized unit in the target IAB host node. Referring to fig. 3, the first node is IAB node5a, and the second node is IAB node5b; the UE connects to the source CU (IAB donor 1) through IAB node5 a.

In the process of switching the target object, the source concentration unit sends a radio resource control layer (Radio Resource Control, RRC) reconfiguration message to the target object, wherein the RRC reconfiguration message is used for indicating the target object to perform RRC reconfiguration and establishing connection with a second node so as to access a target cell, and the target cell is a cell corresponding to the target IAB host node.

Accordingly, after step 101, as shown in fig. 2, the target object performs steps 201 to 202;

step 201, receiving a radio resource control layer (RRC) reconfiguration message sent by a source concentration unit; the source centralized unit is a centralized unit in a source Integrated Access Backhaul (IAB) host node.

The target object receives the RRC reconfiguration message sent from the source-concentrated unit and performs step 202.

Step 202, performing RRC reconfiguration according to the RRC reconfiguration message, and establishing connection with the second node;

And the target object performs RRC reconfiguration according to the RRC reconfiguration message, establishes connection with the second node, and is accessed into the target node to complete target object switching.

In the embodiment of the application, a source centralized unit sends a radio resource control layer (RRC) reconfiguration message to a target object; the target object receives an RRC reconfiguration message sent by the source concentration unit; and carrying out RRC reconfiguration according to the RRC reconfiguration message, and establishing connection with the second node to realize the switching of the IAB node among different CUs so as to enlarge the moving range of the IAB node, meet the actual application requirements and avoid the limitation of the switching of the IAB node to limit the mobility of the IAB node.

In an alternative embodiment, the RRC reconfiguration message includes:

The signaling resource bearer (Signal Resource Bearer, SRB) configuration information carries configuration information required for establishing SRB connection with the second node; the target configuration information carries configuration information required for establishing target configuration item connection with the second node; the handover indication information indicates that the target object is handed over to the second node.

In an optional embodiment, if the target object includes the terminal or the fourth node, the second node is a node corresponding to the same physical IAB node as the first node; for example, referring to fig. 3, if the target object is a UE or a descendant node of the first node IAB node5a, the second node is IAB node5b, where IAB node5a corresponds to the same physical IAB node (IAB node 5) as IAB node5 b;

If the target object comprises the third node, the second node is a node corresponding to a different physical IAB node from the first node; for example, if the third node is IAB node5 (IAB node5 a), then the second node is IAB node4, i.e., IAB node5 switches between IAB node3 and IAB node 4; IAB node4 corresponds to a different physical IAB node than IAB node 5.

In an alternative embodiment, if the target object comprises a terminal or a third node, the target configuration item comprises a data resource bearer (Data Resource Bearer, DRB); or alternatively, the first and second heat exchangers may be,

If the target object includes the third node or the fourth node, the target configuration item includes a backhaul radio link control layer protocol path (BH RLC CHANNEL).

In an optional embodiment, before sending the RRC reconfiguration message of the radio resource control layer to the target object in step 101, the method further includes:

Sending a switching request to the target centralized unit; optionally, the handover request may be sent through an Xn interface;

Receiving a switching response sent by a target centralized unit, wherein the switching response comprises the RRC reconfiguration message; the target concentration unit sends the RRC reconfiguration message to the source concentration unit.

Optionally, the handover request may carry one or more of the following parameters:

(1) The third node (MIGRATING IAB NODE) and the context information of its offspring nodes;

(2) All UE context information, the UE includes the UE below MIGRATING IAB NODE and the UE below its descendant nodes.

(3) MIGRATING IAB NODE and its descendant nodes.

In an alternative embodiment, the RRC reconfiguration message includes: node configuration information;

The node configuration information includes: backhaul Adaptation Protocol (BAP) configuration parameters of the third node or the fourth node; wherein, the backhaul adaptation protocol (Backhaul Adaptation Protocol, BAP) configuration parameter is used to configure the radio link control layer protocol (Radio Link Control, RLC) channel identification ID corresponding to the access connection at the BAP protocol layer; the access connection is the connection between the third node or the fourth node and the second node, that is, the RRC reconfiguration message carries the RLC channel ID to be mapped after the target object accesses the second node.

In an alternative embodiment, if the RRC reconfiguration message includes: SRB configuration information and target configuration information of a target configuration item corresponding to the target object;

And establishing SRB connection with a target centralized unit according to the SRB configuration information, establishing the target configuration item connection with the target centralized unit according to the target configuration information, and releasing the SRB connection with the source centralized unit. And the target object establishes SRB connection and target configuration item connection according to the SRB configuration information and the target configuration information respectively, and releases the SRB connection with the source centralized unit after the RRC reconfiguration is completed.

Referring to fig. 3, taking a target object as an example of UE, the target object handover process includes the following steps:

Step 1, a source CU (IAB donor 1) initiates a switching request to a target CU (IAB donor 2);

The path between the IAB node5a and the source CU is used as a source path of the UE, the path between the IAB node5b and the target CU is used as a target path of the UE, and after the target object switching is completed, the data transmission path of the UE is switched from the source path to the target path.

The source CU initiates a handover request requesting a handover of the third node (IAB node5, IAB node5a or IAB node5 b) and its following descendant nodes and UEs onto IAB node 2.

(1) The context information of the third node (i.e., the migration node MIGRATING IAB NODE) and its descendants;

(3) MIGRATING IAB NODE and its descendant nodes.

Step 2, IAB donor 2 replies to the request with a handoff response (Xn handover request ACK message).

The switching response comprises RRC reconfiguration information (RRC reconfiguration) aiming at the migration node, the offspring node and the UE; RRC reconfiguration carrying SRB and DRB configuration information between the UE and the target cell, one or more SRBs may be configured, for example, SRB1/2; one or more DRBs may be configured.

Step 3, IAB node 5 is in MT dual connection, and the DU of IAB node 5 maintains two session instance (F1) connections with IAB donor1 and IAB donor 2, respectively. The IAB node 5 may perform normal data transmission with the source CU and the core network, or may perform data transmission with the target CU and the core network.

Step 4, the source CU sends RRC reconfiguration information to the UE

The source CU forwards the RRC reconfiguration message to the UE through the IAB node 5a to enable the UE to carry out RRC reconfiguration.

It is to be understood that the 3 rd step and the 4 th step do not distinguish execution sequence.

Step 5, the UE executes RRC reconfiguration to complete.

The UE transmits an RRC reconfiguration complete message to the target CU, where the RRC reconfiguration complete message and the DRB configuration complete message are carried, and the SRB configuration complete message and the DRB configuration complete message may be sent separately or together.

In the RRC reconfiguration process, the UE establishes SRB connection and DRB connection with the target CU according to the SRB configuration information and the DRB configuration information in the step 2, then performs data transmission, releases the SRB connection between the UE and the source CU, can reserve SRB configuration and safety configuration between the UE and the source CU, and does not release the DRB.

And 6, releasing the UE context.

And after IAB node 5 is successfully migrated to the target CU. And releasing SRB configuration and safety configuration between the source CUs through a UE context release (context release) message, stopping uplink and downlink data receiving or transmission with the CU sources, and completing target object switching.

In an alternative embodiment, if the RRC reconfiguration message includes SRB configuration information;

Or (b)

That is, if the RRC reconfiguration message includes only SRB configuration information, the target object first establishes an SRB connection with the target concentrating unit according to the SRB configuration information; and then establishing DRB connection with the target centralized unit according to the SRB connection and the target configuration item connection sent by the target centralized unit or through random access.

As a second example, referring to fig. 4, taking still the target object as UE as an example, the target object handover procedure comprises the following steps:

The source CU initiates a handover request requesting a handover of the third node (i.e., the migrating node: IAB node5, IAB node5a or IAB node5 b) and its following descendant nodes and UEs to IAB node 2.

(1) The context information of the migration node (MIGRATING IAB NODE) and its offspring nodes;

(3) MIGRATING IAB NODE and its descendant nodes.

And 4, the source CU sends RRC reconfiguration information to the UE.

And the source CU forwards an RRC reconfiguration message to the UE through the IAB node 5a, so that the UE performs RRC reconfiguration, and the RRC reconfiguration message only carries SRB configuration information.

Step 5, the UE performs RRC reconfiguration.

Step 5 includes step 5a or step 5b, in which step 5a, UE establishes DRB connection with the target centralized unit through random access; in step 5b, the SRB connection established in step 4 receives the DRB configuration information sent by the target concentrating unit, and establishes a DRB connection with the target concentrating unit according to the DRB configuration information.

After completing the RRC reconfiguration, the UE transmits an RRC reconfiguration complete message to the target CU, where the RRC reconfiguration complete message and the DRB configuration complete message are carried, and the SRB configuration complete message and the DRB configuration complete message may be sent separately or together.

In the RRC reconfiguration process, the UE establishes SRB connection and DRB connection with the target CU respectively, then performs data transmission, releases the SRB connection between the UE and the source CU, can reserve SRB configuration and safety configuration between the UE and the source CU, and does not release the DRB.

And 6, releasing the UE context.

In an alternative embodiment, the RRC reconfiguration message includes the target configuration information;

If the RRC reconfiguration message comprises the target configuration information carried in the target configuration information, the target object preferentially establishes the target configuration item connection with the target centralized unit in the RRC reconfiguration process; the SRB connection is then established by random access.

As a third example, referring to fig. 5, taking still the target object as UE as an example, the target object handover procedure comprises the following steps:

The source CU initiates a handover request requesting to handover the migration node (IAB node5, IAB node5a or IAB node5 b) and its following descendant nodes and UEs to IAB donor 2.

(3) MIGRATING IAB NODE and its descendant nodes.

Step 4, the source CU sends RRC reconfiguration information to the UE, the UE performs RRC reconfiguration, and establishes DRB connection with the target centralized unit

And the source CU forwards an RRC reconfiguration message to the UE through the IAB node 5a, so that the UE performs RRC reconfiguration, and the RRC reconfiguration message only carries DRB configuration information.

And step 5, establishing SRB connection with the target centralized unit through random access.

And 6, finishing RRC reconfiguration.

And 7, releasing the UE context.

In an alternative embodiment, the RRC reconfiguration message includes the handover indication information, the handover indication information indicating that the target object is handed over to the second node.

The establishing a connection with the second node includes:

If the RRC reconfiguration message is only the switching indication information, the target configuration object establishes connection with the SRB connection of the target centralized unit and the target configuration item through random access.

As a fourth example, referring to fig. 6, taking still the target object as UE as an example, the target object handover procedure comprises the following steps:

(3) MIGRATING IAB NODE and its descendant nodes.

And the source CU forwards an RRC reconfiguration message to the UE through the IAB node 5a, so that the UE performs RRC reconfiguration, and the RRC reconfiguration message only carries switching indication information.

And step 5, establishing SRB connection and DRB connection with the target centralized unit through random access.

And 6, finishing RRC reconfiguration.

And 7, releasing the UE context.

It should be noted that, the first to fourth examples are only illustrated by taking the UE as a target object, and the target object may also be a third node or the fourth node; when the target object is a third node, the second node is a node corresponding to a different physical IAB node with the first node, the target configuration item is BH RLC CHANNEL, and other processes are the same as the target object switching process of the UE; when the target object is the fourth node, the target configuration item is BH RLC CHANNEL, and other processes are the same as the target object switching process of the UE.

Furthermore, in the above embodiment, the third node or the descendant node needs to establish an F1 (session instance) connection with the second node before the UE context is released.

Referring to fig. 1, an embodiment of the present application provides a target object switching method, which is applied to a source centralized unit, where the source centralized unit is a centralized unit in an source integrated access backhaul IAB host node, and the method includes:

step 101, a radio resource control layer RRC reconfiguration message is sent to a target object, where the RRC reconfiguration message is used to instruct the target object to perform RRC reconfiguration, and establish connection with a second node;

The target object is connected to the source concentration unit through a first node and connected to the target concentration unit through a second node; the target centralized unit is a centralized unit in the target IAB host node. Referring to fig. 3, the first node is IAB node5a, and the second node is IAB node5b; the UE connects to the source CU (IAB donor 1) through IAB node5 a.

In the process of switching the target object, the source concentration unit sends a radio resource control layer (Radio Resource Control, RRC) reconfiguration message to the target object, wherein the RRC reconfiguration message is used for indicating the target object to perform RRC reconfiguration and establishing connection with a second node so as to access a target cell and realize target object switching; the target cell is a cell corresponding to the target IAB host node.

Optionally, in an embodiment of the present application, the RRC reconfiguration message includes:

Optionally, in an embodiment of the present application, the target object includes a terminal, a third node, or a fourth node; the fourth node is a descendant node of the third node.

Optionally, in the embodiment of the present application, if the target object includes the terminal or the fourth node, the second node is a node corresponding to the same physical IAB node as the first node; or (b)

Optionally, in the embodiment of the present application, if the target object includes a terminal, the target configuration item includes a data resource bearer DRB; or (b)

Optionally, in an embodiment of the present application, before the sending the RRC reconfiguration message of the radio resource control layer to the target object, the method further includes:

Sending a switching request to the target centralized unit;

Optionally, in the embodiment of the present application, the RRC reconfiguration message includes: node configuration information;

In the embodiment of the application, the source centralized unit sends the RRC reconfiguration message of the radio resource control layer to the target object, so that the target object receives the RRC reconfiguration message, then performs RRC reconfiguration according to the RRC reconfiguration message, and establishes connection with the second node to realize the switching of the IAB node among different CUs, thereby expanding the moving range of the IAB node, meeting the actual application requirement and avoiding the limitation of the switching of the target object from limiting the mobility of the IAB node.

Referring to fig. 2, an embodiment of the present application provides a target object switching method, which is applied to a target object, and includes:

step 201, receiving a radio resource control layer (RRC) reconfiguration message sent by a source concentration unit; the source centralized unit is a centralized unit in a source integrated access backhaul IAB host node;

IABs are generally classified into IAB host nodes (donor) and IAB nodes (IAB nodes); the IAB node is an access node supporting wireless access of the UE and carrying out wireless backhaul on data; the IAB node provides a wireless backhaul function for the IAB node so that the UE is connected with an access node of the core network; the source hub unit is a hub unit in the source IAB host node.

Optionally, in the embodiment of the present application, if the target object includes a terminal or a fourth node, the second node is a node corresponding to the same physical IAB node as the first node; or (b)

Optionally, in the embodiment of the present application, the RRC reconfiguration message includes: SRB configuration information and target configuration information of a target configuration item corresponding to the target object;

Optionally, in an embodiment of the present application, the RRC reconfiguration message includes SRB configuration information;

Or (b)

Optionally, in an embodiment of the present application, the RRC reconfiguration message includes the target configuration information;

Optionally, in an embodiment of the present application, the RRC reconfiguration message includes the handover indication information, and the establishing connection with the second node includes:

In the embodiment of the application, the target object receives the RRC reconfiguration message sent by the source concentration unit, carries out RRC reconfiguration according to the RRC reconfiguration message, establishes connection with the second node, and realizes the switching of the IAB node among different CUs so as to enlarge the moving range of the IAB node, meet the actual application requirement and avoid the limitation of the switching of the target object to limit the mobility of the IAB node.

The signal transmission method provided by the embodiment of the application is introduced above, and the target object switching device, the electronic device and the network device provided by the embodiment of the application are introduced below by combining the drawings.

Referring to fig. 7, the embodiment of the present application further provides a target object switching device, which is applied to a source centralized unit, where the source centralized unit is a centralized unit in an source integrated access backhaul IAB host node, and the device includes:

A message sending module 701, configured to send a radio resource control layer RRC reconfiguration message to a target object, where the RRC reconfiguration message is configured to instruct the target object to perform RRC reconfiguration, and establish connection with a second node;

Wherein the IABs are generally classified into IAB host nodes (donor) and IAB nodes (IAB nodes); the IAB node is an access node supporting wireless access of the UE and carrying out wireless backhaul on data; the IAB node provides a wireless backhaul function for the IAB node so that the UE is connected with an access node of the core network;

Optionally, the RRC reconfiguration message includes:

Optionally, the apparatus further comprises:

a request sending module, configured to send a handover request to the target centralized unit;

And the response receiving module is used for receiving a switching response sent by the target centralized unit, wherein the switching response comprises the RRC reconfiguration message.

In the embodiment of the present application, the message sending module 701 sends the RRC reconfiguration message of the radio resource control layer to the target object, so that after the target object receives the RRC reconfiguration message, RRC reconfiguration is performed according to the RRC reconfiguration message, and connection is established with the second node, so as to implement switching between different CUs of the IAB node, so as to expand the moving range of the IAB node, meet the actual application requirement, and avoid limitation of switching of the target object to limit mobility of the IAB node.

Referring to fig. 8, the embodiment of the present application further provides a target object switching device, and the embodiment of the present application further provides a target object switching device, which is applied to a target object, where the device includes:

A message receiving module 801, configured to receive a radio resource control layer RRC reconfiguration message sent by a source concentration unit; the source centralized unit is a centralized unit in a source Integrated Access Backhaul (IAB) host node.

A connection establishment module 802, configured to perform RRC reconfiguration according to the RRC reconfiguration message, and establish a connection with a second node;

In the process of switching the target object, the source concentration unit sends a radio resource control layer (Radio Resource Control, RRC) reconfiguration message to the target object, wherein the RRC reconfiguration message is used for indicating the target object to perform RRC reconfiguration and establishing connection with a second node so as to access a target cell, and the target cell is a cell corresponding to the target IAB host node. Optionally, the RRC reconfiguration message includes:

the connection establishment module 802 includes:

and the first establishing submodule is used for establishing SRB connection with the target centralized unit according to the SRB configuration information, establishing the target configuration item connection with the target centralized unit according to the target configuration information and releasing the SRB connection with the source centralized unit.

the connection establishment module 802 includes:

a second establishing sub-module, configured to establish an SRB connection with the target concentrating unit through the second node according to the SRB configuration information;

Or (b)

the connection establishment module 802 includes:

The third establishing sub-module is used for establishing target configuration item connection with the target centralized unit through the second node according to the target configuration information;

Optionally, the RRC reconfiguration message includes the handover indication information, and the connection establishment module 802 includes:

And a fourth establishing sub-module, configured to establish, through random access, connection between the SRB connection of the target centralized unit and the target configuration item.

In the embodiment of the present application, the message receiving module 801 receives the RRC reconfiguration message sent by the source centralized unit, and the connection establishing module 802 performs RRC reconfiguration according to the RRC reconfiguration message, and establishes connection with the second node, so as to implement switching between different CUs of the IAB node, so as to expand the movement range of the IAB node, meet the actual application requirement, and avoid limitation of switching of the target object to limit mobility of the IAB node.

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 in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

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

Referring to fig. 9, the embodiment of the present application further provides a network device, including:

memory 920, transceiver 910, processor 900;

a memory for storing a computer program;

A transceiver 910 for transceiving data under the control of the processor 900;

a processor 900 for reading the computer program in the memory and performing the following operations:

Optionally, the RRC reconfiguration message includes:

Optionally, if the target object includes the terminal or the fourth node;

The second node is a node corresponding to the same physical IAB node as the first node; or (b)

Optionally, the network device is further configured to:

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 900 and various circuits of memory represented by memory 920, 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. Bus interface 940 provides an interface. Transceiver 900 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. The processor 900 is responsible for managing the bus architecture and general processing, and the memory 920 may store data used by the processor 900 in performing operations.

The processor 900 may be a Central Processing Unit (CPU), application SPECIFIC INTEGRATED Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA), or complex Programmable logic device (Complex Programmable Logic Device, CPLD), or may employ a multi-core architecture.

In the embodiment of the application, the network equipment sends the RRC reconfiguration message of the radio resource control layer to the target object, so that the target object receives the RRC reconfiguration message, then carries out RRC reconfiguration according to the RRC reconfiguration message, and establishes connection with the second node, thereby realizing the switching of the IAB node among different CUs, expanding the moving range of the IAB node, meeting the actual application requirement, and avoiding the limitation of the switching of the target object from limiting the mobility of the IAB node.

Referring to fig. 10, the embodiment of the present application further provides an electronic device, which may be a UE or a network device;

the electronic device includes: memory 1020, transceiver 1010, processor 1000;

A memory 1020 for storing a computer program;

a transceiver 1010 for transceiving data under the control of the processor 1000;

A processor 1000 for reading the computer program in the memory 1020 and performing the following operations:

Optionally, the RRC reconfiguration message includes:

Or (b)

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 the processor 1000 and various circuits of the memory, represented by the memory 1020, are chained 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. Bus interface 1040 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 1000 is responsible for managing the bus architecture and general processing, and the memory 1020 may store data used by the processor 1000 in performing operations.

Processor 1000 may be a Central Processing Unit (CPU), application SPECIFIC INTEGRATED Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA), or complex Programmable logic device (Complex Programmable Logic Device, CPLD), and may also employ a multi-core architecture.

In the embodiment of the application, the electronic equipment receives the RRC reconfiguration message sent by the source concentration unit, carries out RRC reconfiguration according to the RRC reconfiguration message, establishes connection with the second node, and realizes the switching of the IAB node among different CUs so as to enlarge the moving range of the IAB node, meet the actual application requirement and avoid the limitation of the switching of the target object to limit the mobility of the IAB node.

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

Embodiments of the present application also provide a processor-readable storage medium storing a computer program for causing the processor to execute a signal transmission method.

The 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 storage (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), and semiconductor storage (e.g., ROM, EPROM, EEPROM, non-volatile storage (NAND FLASH), solid State Disk (SSD)), 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. The target object switching method is applied to a source centralized unit, wherein the source centralized unit is a centralized unit in an source Integrated Access Backhaul (IAB) host node, and is characterized by comprising the following steps:

The source centralized unit initiates a switching request to switch a target object to a target centralized unit, wherein the target object is in MT double connection, and the target object maintains two session instance connections with the source centralized unit and the target centralized unit respectively;

2. The target object handover method according to claim 1, wherein the RRC reconfiguration message includes:

3. The target object switching method according to claim 2, wherein the target object includes a terminal, a third node, or a fourth node;

The fourth node is a descendant node of the third node.

4. The target object handover method according to claim 3, wherein if the target object includes the terminal or the fourth node, the second node is a node corresponding to the same physical IAB node as the first node; or (b)

5. The method for switching a target object according to claim 3, wherein if the target object includes a terminal, the target configuration item includes a data resource bearer DRB; or (b)

6. The target object handover method according to claim 1, wherein before the sending the radio resource control layer RRC reconfiguration message to the target object, the method further comprises:

Sending a switching request to the target centralized unit;

7. The target object handover method according to claim 3, wherein the RRC reconfiguration message includes: node configuration information;

8. A target object switching method applied to a target object, the method comprising:

The target object is in MT double connection, the target object respectively maintains two session instance connections with the source concentration unit and the target concentration unit, the target object is connected to the source concentration unit through a first node and is connected to the target concentration unit through a second node; the target centralized unit is a centralized unit in the target IAB host node.

9. The target object handover method according to claim 8, wherein the RRC reconfiguration message includes:

10. The method according to claim 9, wherein if the target object includes a terminal or a fourth node, the second node is a node corresponding to the same physical IAB node as the first node; or (b)

11. The method for switching a target object according to claim 10, wherein if the target object includes a terminal, the target configuration item includes a data resource bearer DRB; or (b)

12. The target object handover method according to claim 9, wherein the RRC reconfiguration message includes: SRB configuration information and target configuration information of a target configuration item corresponding to the target object;

13. The target object handover method according to claim 9, wherein the RRC reconfiguration message includes SRB configuration information;

Or (b)

14. The target object handover method according to claim 9, wherein the RRC reconfiguration message includes the target configuration information;

15. The target object handover method according to claim 9, wherein the RRC reconfiguration message includes the handover indication information, and the establishing of the connection with the second node includes:

16. A network device, the network device comprising: a memory, transceiver, processor;

a memory for storing a computer program;

a transceiver for transceiving data under control of the processor;

the method comprises the steps that a source centralized unit initiates a switching request to switch a target object to a target centralized unit, wherein the target object is in MT double connection, and the target object maintains two session instance connections with the source centralized unit and the target centralized unit respectively;

17. The network device of claim 16, wherein the RRC reconfiguration message includes:

18. The network device of claim 17, wherein the target object comprises a terminal, a third node, or a fourth node;

The fourth node is a descendant node of the third node.

19. The network device of claim 18, wherein if the target object comprises the terminal or the fourth node, the second node is a node corresponding to the same physical IAB node as the first node; or (b)

20. The network device of claim 18, wherein if the target object comprises a terminal, the target configuration item comprises a data resource bearer DRB; or (b)

21. The network device of claim 16, wherein the network device is further configured to:

Sending a switching request to the target centralized unit;

22. The network device of claim 18, wherein the RRC reconfiguration message includes: node configuration information;

23. An electronic device, the electronic device comprising: a memory, transceiver, processor;

a memory for storing a computer program;

a transceiver for transceiving data under control of the processor;

24. The electronic device of claim 23, wherein the RRC reconfiguration message includes:

25. The electronic device of claim 24, wherein if the target object comprises a terminal or a fourth node, the second node is a node corresponding to the same physical IAB node as the first node; or (b)

26. The electronic device of claim 25, wherein if the target object comprises a terminal, the target configuration item comprises a data resource bearer DRB; or (b)

27. The electronic device of claim 24, wherein the RRC reconfiguration message includes: SRB configuration information and target configuration information of a target configuration item corresponding to the target object;

28. The electronic device of claim 24, wherein the RRC reconfiguration message includes SRB configuration information;

Or (b)

29. The electronic device of claim 24, wherein the RRC reconfiguration message includes the target configuration information;

30. The electronic device of claim 24, wherein the RRC reconfiguration message includes the handover indication information, and wherein the establishing of the connection with the second node includes:

31. A target object switching device, applied to a source centralized unit, the source centralized unit being a centralized unit in a source integrated access backhaul IAB host node, the device comprising:

The system comprises a source concentrating unit, a request initiating module and a target concentrating unit, wherein the source concentrating unit initiates a switching request to switch a target object to the target concentrating unit, the target object is in MT double connection, and the target object maintains two session instance connections with the source concentrating unit and the target concentrating unit respectively;

32. A target object switching apparatus applied to a target object, the apparatus comprising:

33. 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 15.