CN114390727A

CN114390727A - Target object switching method and device, electronic equipment and network equipment

Info

Publication number: CN114390727A
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: 2022-04-22
Anticipated expiration: 2040-10-22
Also published as: CN114390727B

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 accessed to an IAB host node by a source integration, 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; wherein 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 concentration unit is a concentration unit in a target IAB host node. The embodiment of the application provides a switching scheme of an IAB node 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 target object switching method and apparatus, an electronic device, and a network device.

Background

In a New air interface technology (5th Generation New Radio, 5G NR) system of the fifth Generation mobile communication technology, a peak theoretical transmission speed thereof may reach several tens of Gb (gigabytes) per second, which is hundreds of times faster than a transmission speed of Long Term Evolution (LTE, i.e., 4G network). The 5G NR system is capable of realizing a high transmission speed in the use of millimeter waves. Specifically, millimeter waves refer to electromagnetic waves having a wavelength on the order of millimeters, and having a frequency of approximately between 30 gigahertz (GHz) and 300 GHz. One characteristic of the millimeter wave band is that the attenuation is large in air and the diffraction capability is weak. For this purpose, an Integrated Access Backhaul (IAB) technology is proposed. The IAB can more flexibly deploy the dense NR cell network through the wireless backhaul link and the relay link without correspondingly increasing the dense deployment of the transport network.

With the proposal of the IAB technology, it is no longer necessary for each User Equipment (UE) to be connected to a Centralized Unit (CU), and the UE only needs to be connected to an IAB node (node), and an IAB host node (donor) manages the IAB nodes in a unified manner and directly communicates with a core network, so that network deployment is more flexible. However, in the current 5G NR system, only IAB node handover in the same CU is supported, which limits mobility of the IAB node and cannot meet practical application. Therefore, it is desirable to provide a handover of an IAB node between different CUs to extend the mobility range 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, so as to provide 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 a 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;

wherein 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 concentration unit is a concentration unit in a target IAB host node.

Optionally, the RRC reconfiguration message includes:

the signaling resource bears 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 that the target object is switched 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

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

If the target object comprises the third node or the fourth node, the target configuration item comprises a return wireless link control layer protocol channel.

Optionally, before sending the RRC reconfiguration message to the target object, the method further includes:

sending a handover request to the target concentration unit;

and receiving a switching response sent by a 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: a backhaul adaptive protocol, BAP, configuration parameter of the third node or the fourth node; the BAP configuration parameters are used for configuring an RLC channel identification ID corresponding to the BAP protocol layer; the access connection is a connection of the third node or the fourth node with the second node.

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

receiving a radio resource control layer RRC reconfiguration message sent by a unit in a source set; the source centralized unit is a centralized unit which is accessed into the back-transmission IAB host node by source integration;

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 bears at least one of SRB configuration information, target configuration information of a target configuration item corresponding to the target object and switching indication information; and the switching indication information is used for indicating a target object to be switched to a 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

If the target object comprises a third node, the second node is a node corresponding to a different physical IAB node from 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:

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

receiving target configuration information sent by the target centralized unit through the SRB connection, and establishing a target configuration item connection sent by the target centralized unit according to the target configuration information;

or

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

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

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

and establishing the 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, where the network device includes:

a memory, a transceiver, 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:

wherein the target object is connected to the source concentration unit through the first node and is connected to the target concentration unit through the second node; the source centralized unit is a centralized unit of a source integrated access return IAB host node, and the target centralized unit is a centralized unit of a 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 central unit;

a handover response receiving module, configured to receive a handover response sent by a target central unit, where the handover response includes the RRC reconfiguration message.

In a fourth aspect, an embodiment of the present application further provides an electronic device, where the electronic device includes: a memory, a transceiver, a 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 a unit in the source set; the source centralized unit is a centralized unit which is accessed into the back-transmission IAB host node by source integration;

Optionally, the RRC reconfiguration message includes:

or

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

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

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

a message receiving module, configured to receive a radio resource control layer RRC reconfiguration message sent by a unit in a source set; the source centralized unit is a centralized unit which is accessed into the back-transmission IAB host node by source integration;

the connection establishing 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, when executing the computer program, implements the steps in the target object switching method described above.

In an eighth aspect, the present application further provides a processor-readable storage medium, where a computer program is stored on the processor-readable storage medium, and when executed by a processor, the computer program implements the steps in the target object switching method 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; and the target object receives the RRC reconfiguration message sent by the unit in the source set, performs RRC reconfiguration according to the RRC reconfiguration message, establishes connection with the second node, and realizes switching of the IAB node among different CUs 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 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 needed to be used in the description of the embodiments of the present application will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 shows one of flowcharts of a target object switching method provided in an embodiment of the present application;

fig. 2 shows a second flowchart of a target object switching method according to an embodiment of the present application;

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

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

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

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

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

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 present application, the term "and/or" describes an association relationship of associated objects, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

In the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present 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 an IAB node among CUs.

The method and the device are based on the same application concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

In addition, the technical scheme provided by the embodiment of the application can be applied to various systems, especially 5G systems. For example, the applicable system may be a global system for mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS) system, a long term evolution (long term evolution, LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD) system, an LTE-a (long term evolution) system, a universal mobile system (universal mobile telecommunications system, UMTS), a Worldwide Interoperability for Mobile Access (WiMAX) system, a New Radio network (NR 5) system, etc. These various systems include terminal devices and network devices. The System may further include a core network portion, such as an Evolved Packet System (EPS), a 5G System (5GS), and the like.

The terminal device referred to in the embodiments of the present application may refer to a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or another processing device connected to a wireless modem. In different systems, the names of the terminal devices may be different, for example, in a 5G system, the terminal device may be called a User Equipment (UE). A wireless terminal device, which may be a mobile terminal device such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal device, for example, a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device, may communicate with one or more Core Networks (CNs) via a Radio Access Network (RAN). Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). The wireless terminal device may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), an access point (access point), a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), and a user device (user device), which are not limited in this embodiment of the present application.

The network device according to the embodiment of the present application may be a base station, and the base station may include a plurality of cells for providing services to a terminal. A base station may also be referred to as an access point, or a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or by other names, depending on the particular application. The network device may be configured to exchange received air frames with 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 Base Transceiver Station (BTS) in a Global System for Mobile communications (GSM) or a Code Division Multiple Access (CDMA), may be a network device (NodeB) in a Wideband Code Division Multiple Access (WCDMA), may be an evolved Node B (eNB or e-NodeB) in a Long Term Evolution (LTE) System, may be a 5G Base Station (gbb) in a 5G network architecture (next evolution System), may be a Home evolved Node B (HeNB), a relay Node (relay Node), a Home Base Station (femto), a pico Base Station (pico Base Station), and the like, which are not limited in the embodiments of the present application. In some network architectures, a network device may include a Centralized Unit (CU) node and a Distributed Unit (DU) node, which may also be geographically separated.

Multiple Input Multiple Output (MIMO) transmission may be performed between the network device and the terminal device by using one or more antennas, where the MIMO transmission may be Single User MIMO (SU-MIMO) or Multi-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 root antenna combinations.

Fig. 1 and fig. 2 respectively show a flowchart of a target object switching method provided in 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, sending a radio resource control layer RRC reconfiguration message to a target object, where the RRC reconfiguration message is used to instruct the target object to perform RRC reconfiguration and establish a connection with a second node.

IABs are generally divided into IAB host nodes (donors) and IAB nodes (IAB nodes); the IAB node is an access node which supports the wireless access of the UE and wirelessly transmits data back; the IAB node provides a wireless backhaul function for the IAB node so that the UE is connected with an access node of a core network;

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

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

optionally, in this 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. In connection with fig. 3, the third node may be IAB node5(IAB node5a or IAB node5b, both being the same physical IAB node); the third node is a father 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 a third node, the first node is itself. The fourth node is a descendant node of the third node. Fig. 3 illustrates a UE as a target object, and it is 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 is connected to the target concentration unit through a second node; a first node is a source access node, and a second node is a target access node; the target concentration unit is a concentration unit in a target IAB host node. Referring to fig. 3, the first node is IAB node5a, and the second node is IAB node5 b; the UE is connected to the source CU (IAB donor1) through IAB node5 a.

In the process of switching the target object, the unit in the source set sends a Radio Resource Control (RRC) layer reconfiguration message to the target object, where the RRC reconfiguration message is used to indicate the target object to perform RRC reconfiguration and establish connection with the second node to access the 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 unit in a source set; the source centralized unit is a centralized unit which is accessed into the back-transmission IAB host node by source integration.

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

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

And the target object performs RRC reconfiguration according to the RRC reconfiguration message, establishes connection with the second node, accesses the target node and completes 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; a target object receives an RRC reconfiguration message sent by a unit in a source set; and performing RRC reconfiguration according to the RRC reconfiguration message, establishing connection with the second node, and realizing 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 limitation of switching of the IAB node on mobility of the IAB node.

In an optional embodiment, the RRC reconfiguration message comprises:

The configuration information of the Signaling Resource Bearer (SRB) carries the configuration information required for establishing the 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, and the IAB node5a and the IAB node5b correspond to the same physical IAB node (IAB node 5);

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 node5a), the second node is IAB node4, that is, 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 optional embodiment, if the target object includes a terminal or a third node, the target configuration item includes a Data Resource Bearer (DRB); or the like, or, alternatively,

if the target object comprises the third node or the fourth node, the target configuration item comprises a backhaul radio link control layer protocol channel (BH RLC channel).

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

sending a handover request to the target concentration unit; optionally, the handover request may be sent over an Xn interface;

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

Optionally, one or more of the following parameters may be carried in the handover request:

(1) context information of the third node (migrating IAB node) and its descendant nodes;

(2) all UE context information, UE, includes UE under the migating IAB node and UE under its descendant nodes.

(3) Topology information between the migrating IAB node and its descendant nodes.

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

the node configuration information includes: a backhaul adaptive protocol, BAP, configuration parameter of the third node or the fourth node; wherein, the Backhaul Adaptation Protocol (BAP) configuration parameter is used to configure a Radio Link Control (RLC) channel identifier ID corresponding to the BAP Protocol layer; the access connection is a connection between the third node or the fourth node and the second node, that is, the RRC reconfiguration message carries an RLC channel ID to be mapped after the target object is accessed to the second node.

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

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 respectively according to the SRB configuration information and the target configuration information, and releases the SRB connection with the unit in the source set after RRC reconfiguration is completed.

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

step 1, a source CU (IAB donor1) initiates a switching request to a target CU (IAB donor 2);

the path from IAB node5a to the source CU is used as the source path of the UE, the path from IAB node5b to the target CU is used as the 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 that the third node (IAB node5, IAB node5a or IAB node5b) and its following descendant nodes and UEs switch onto IAB node 2.

(1) context information of the third node (i.e., the migration node), and its descendant nodes;

Step 2, responding to the request by the IAB donor2, and replying a switching response (Xn handover request ACK message).

The handover response includes RRC reconfiguration messages (RRC reconfiguration) for the migrating node, the descendant node, and the UE; the RRC reconfiguration message carries SRB and DRB configuration information between the UE and the target cell, and may configure one or more SRBs, for example, SRB 1/2; one or more DRBs may be configured.

Step 3, IAB node5 is in MT dual connection, and the DU of IAB node5 maintains two session instances (F1) connection with IAB donor1 and IAB donor2, respectively. In this case, the IAB node5 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

And the source CU forwards the RRC reconfiguration message to the UE through the IAB node5a so as to ensure that the UE carries out RRC reconfiguration.

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

And step 5, the UE completes RRC reconfiguration.

The UE transmits an RRC reconfiguration complete message to the target CU, wherein the RRC reconfiguration complete message carries an SRB configuration complete message and a DRB configuration complete message, and the SRB configuration complete message and the DRB configuration complete message can be respectively transmitted or can be transmitted 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 the SRB configuration and the security configuration between the UE and the source CU, and does not release the DRB.

And 6, releasing the UE context.

And after the IAB node5 is successfully migrated to the position below the target CU. And releasing the SRB configuration and the security configuration between the source CUs through a context release (context release) message of the UE, and stopping receiving or transmitting uplink and downlink data with the CU source to complete target object switching.

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

the performing RRC reconfiguration according to the RRC reconfiguration message comprises:

or

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

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

The source CU initiates a handover request requesting that the third node (i.e., the migrating node: IAB node5, IAB node5a or IAB node5b) and its following descendant nodes and UEs be handed over to IAB node 2.

(1) context information of a migration node (migrating IAB node) and its descendant nodes;

And step 4, the source CU sends an RRC reconfiguration message to the UE.

And the source CU forwards the RRC reconfiguration message to the UE through the IAB node5a, so that the UE performs RRC reconfiguration, and the RRC reconfiguration message only carries SRB configuration information.

And step 5, the UE executes RRC reconfiguration.

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

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 by the RRC reconfiguration complete message, 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 the SRB configuration and the security configuration between the UE and the source CU, and does not release the DRB.

And 6, releasing the UE context.

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

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

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

The source CU initiates a handover request requesting that the migrating node (IAB node5, IAB node5a or IAB node5b) and its following descendant nodes and UEs be handed over to IAB node 2.

Step 4, the source CU sends RRC reconfiguration information to the UE, the UE carries out RRC reconfiguration and establishes DRB connection sent by the target central unit

And the source CU forwards the RRC reconfiguration message to the UE through the IAB node5a, so that the UE performs RRC reconfiguration, and the RRC reconfiguration message only carries DRB configuration information.

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

And 6, finishing RRC reconfiguration.

And 7, releasing the UE context.

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

The establishing of the connection with the second node comprises:

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

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

And the source CU forwards the RRC reconfiguration message to the UE through the IAB node5a, so that the UE performs RRC reconfiguration, and the RRC reconfiguration message only carries the switching indication information.

And 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 only illustrate 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 from the first node, the target configuration item is a BH RLC channel, and other processes are the same as the target object switching process of the UE; and when the target object is the fourth node, the target configuration item is a BH RLC channel, and other processes are the same as the target object switching process of the UE.

Furthermore, in the above embodiments, the third or 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 a source integrated access backhaul IAB host node, and the method includes:

step 101, 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;

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

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 concentration unit is a concentration unit in a target IAB host node. Referring to fig. 3, the first node is IAB node5a, and the second node is IAB node5 b; the UE is connected to the source CU (IAB donor1) through IAB node5 a.

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

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

Optionally, in this 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 this embodiment of the 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

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

Optionally, in this embodiment of the present application, before sending the RRC reconfiguration message to the target object, the method further includes:

sending a handover request to the target concentration unit;

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

In the embodiment of the application, the source concentration 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, performs RRC reconfiguration according to the RRC reconfiguration message, establishes connection with the second node, and realizes switching of the IAB node among different CUs, thereby expanding the moving range of the IAB node, meeting the actual application requirement, and avoiding limitation of switching of the target object to limit 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 the method includes:

step 201, receiving a radio resource control layer RRC reconfiguration message sent by a unit in a source set; the source centralized unit is a centralized unit which is accessed into the back-transmission IAB host node by source integration;

IABs are generally divided into IAB host nodes (donors) and IAB nodes (IAB nodes); the IAB node is an access node which supports the wireless access of the UE and wirelessly transmits data back; the IAB node provides a wireless backhaul function for the IAB node so that the UE is connected with an access node of a core network; the source concentration unit is a concentration unit in the source IAB host node.

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

wherein 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 concentration unit is a concentration unit in a target IAB host node. Referring to fig. 3, the first node is IAB node5a, and the second node is IAB node5 b; the UE is connected to the source CU (IAB donor1) through IAB node5 a.

Optionally, in this 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

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

or

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

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

In the embodiment of the application, the target object receives the RRC reconfiguration message sent by the unit in the source set, performs RRC reconfiguration according to the RRC reconfiguration message, and establishes connection with the second node, so as to implement switching of the IAB node between different CUs, thereby expanding the mobility range of the IAB node, satisfying the actual application requirements, and avoiding limitation of target object switching to limit mobility of the IAB node.

In the foregoing, the signal transmission method provided by the embodiment of the present application is described, and the target object switching apparatus, the electronic device, and the network device provided by the embodiment of the present application are described below with reference to the accompanying drawings.

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

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

among them, IABs are generally divided into IAB host nodes (donors) and IAB nodes (IAB nodes); the IAB node is an access node which supports the wireless access of the UE and wirelessly transmits data back; the IAB node provides a wireless backhaul function for the IAB node so that the UE is connected with an access node of a core network;

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

Optionally, the RRC reconfiguration message includes:

Optionally, the apparatus further comprises:

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

a response receiving module, configured to receive a handover response sent by a target central unit, where the handover response includes the RRC reconfiguration message.

In this embodiment of the present application, the message sending module 701 sends an RRC reconfiguration message of a radio resource control layer to the target object, so that the target object performs RRC reconfiguration according to the RRC reconfiguration message after receiving the RRC reconfiguration message, and establishes a connection with the second node, thereby implementing switching of the IAB node between different CUs, so as to expand a moving range of the IAB node, meet a requirement of actual application, and avoid limitation of mobility of the IAB node due to limitation of target object switching.

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

a message receiving module 801, configured to receive a radio resource control layer RRC reconfiguration message sent by a unit in a source set; the source centralized unit is a centralized unit which is accessed into the back-transmission IAB host node by source integration.

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

A connection establishing 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 unit in the source set sends a Radio Resource Control (RRC) layer reconfiguration message to the target object, where the RRC reconfiguration message is used to indicate the target object to perform RRC reconfiguration and establish connection with the second node to access the target cell, and the target cell is a cell corresponding to the target IAB host node. Optionally, the RRC reconfiguration message includes:

the connection establishing module 802 includes:

and the first establishing submodule is used for establishing the 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 establishing module 802 includes:

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

or

the connection establishing module 802 includes:

the third establishing submodule 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 establishing module 802 includes:

and the fourth establishing submodule is used for establishing the connection between the SRB connection of the target centralized unit and the target configuration item through random access.

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

It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a processor readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) 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: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

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

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

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

Optionally, the network device is further configured to:

In fig. 9, among other things, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 900, and various circuits, represented by memory 920, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface 940 provides an interface. The transceiver 900 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium including wireless channels, wired channels, fiber optic cables, and the like. 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), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and may also have a multi-core architecture.

In the embodiment of the application, the network device 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, performs RRC reconfiguration according to the RRC reconfiguration message, establishes connection with the second node, and realizes switching of the IAB node among different CUs, thereby expanding the moving range of the IAB node, meeting the actual application requirement, and avoiding limitation of switching of the target object to limit the mobility of the IAB node.

Referring to fig. 10, an embodiment of the present application further provides an electronic device, where the electronic device 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

Where in fig. 10, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 1000 and memory represented by memory 1020. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. Bus interface 1040 provides an interface. The transceiver 1010 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium including wireless channels, wired channels, fiber optic 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.

The processor 1000 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and may also have a multi-core architecture.

In the embodiment of the application, the electronic device receives an RRC reconfiguration message sent by a unit in a source set, performs RRC reconfiguration according to the RRC reconfiguration message, establishes connection with a second node, and realizes switching of the IAB node among different CUs so as to expand the moving range of the IAB node, meet the actual application requirements, and avoid limitation of switching of target objects to limit the mobility of the IAB node.

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

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

The processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), Solid State Disks (SSDs)), etc.

As will be appreciated by one skilled in the art, 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, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A target object switching method is applied to a source centralized unit, wherein the source centralized unit is a centralized unit in a source Integrated Access Backhaul (IAB) host node, and the method comprises the following steps:

2. The target object handover method of claim 1, wherein the RRC reconfiguration message comprises:

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 method of claim 3, 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

5. The method of claim 3, wherein if the target object comprises a terminal, the target configuration item comprises a Data Resource Bearer (DRB); or

6. The method of claim 1, wherein before sending the RRC reconfiguration message to the target object, the method further comprises:

sending a handover request to the target concentration unit;

7. The method of claim 3, wherein the RRC reconfiguration message comprises: node configuration information;

8. A target object switching method is applied to a target object, and is characterized by comprising the following steps:

9. The method of claim 8, wherein the RRC reconfiguration message comprises:

10. The method of claim 9, 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

11. The method of claim 10, wherein if the target object comprises a terminal, the target configuration item comprises a Data Resource Bearer (DRB); or

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

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

or

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

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

16. A network device, characterized in that the network device comprises: a memory, a transceiver, a processor;

a memory for storing a computer program;

a transceiver for transceiving data under control of the processor;

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

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 a same physical IAB node as the first node; or

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

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

sending a handover request to the target concentration unit;

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

23. An electronic device, characterized in that the electronic device comprises: a memory, a transceiver, a 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 comprises:

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 a same physical IAB node as the first node; or

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

27. The electronic device of claim 24, wherein the RRC reconfiguration message comprises: 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

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 a connection with the second node comprises:

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

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

33. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing a processor to perform the method of any one of claims 1 to 15.