CN114071610B

CN114071610B - Switching method, switching device and related equipment

Info

Publication number: CN114071610B
Application number: CN202010785197.XA
Authority: CN
Inventors: 刘进华
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2023-04-25
Anticipated expiration: 2040-08-06
Also published as: CN114071610A; WO2022028541A1

Abstract

The application discloses a switching method, a switching device and related equipment, wherein the switching method comprises the following steps: and sending an associated set of switching commands to a command receiving node in the IAB network to be switched, wherein the IAB network to be switched comprises an IAB node and a terminal, the set of switching commands correspond to the IAB node and the terminal in the IAB network to be switched, and the IAB node and the terminal in the IAB network to be switched can be subjected to associated switching according to the associated set of switching commands.

Description

Switching method, switching device and related equipment

Technical Field

The application belongs to the technical field of communication, and particularly relates to a switching method, a switching device and related equipment.

Background

In a self-backhauling (integrated access backhaul, IAB) system, an IAB loop may include multiple IAB nodes that each serve a different terminal.

In the related art, in the process of switching a Centralized Unit (CU) network of an IAB network, when a conditional switch of one IAB node is triggered, a downstream node does not know whether a conditional switch behavior of an upstream IAB node is triggered or not when switching from one CU network to another CU network (target CU network), so that a joint switch cannot be implemented.

Disclosure of Invention

The embodiment of the application aims to provide a switching method, a switching device and related equipment, which can solve the problem that an IAB network in the related technology cannot realize joint switching.

In order to solve the technical problems, the application is realized as follows:

in a first aspect, a handover method is provided for a source CU network in an IAB system, the handover method including:

and sending an associated set of switching commands to a command receiving node in an IAB network to be switched, wherein the IAB network to be switched comprises an IAB node and a terminal, and the set of switching commands corresponds to the IAB node and the terminal in the IAB network to be switched.

In a second aspect, a handover method is provided for a first IAB node in an IAB network to be handed over, where the handover method includes:

receiving a first switching command sent by an upstream node of the first IAB node or a source CU network;

and under the condition of executing the first switching command, sending a first indication message to instruct a second IAB node to execute a second switching command associated with the first switching command, wherein the second IAB node is a downstream node of the first IAB node.

In a third aspect, a handover method is provided for a second IAB node in an IAB network to be handed over, where the handover method includes:

Receiving a first indication message sent by a first IAB node; the first IAB node is an upstream node of the second IAB node, and corresponds to a first switching command;

a second handover command corresponding to the second IAB node and associated with the first handover command is executed.

In a fourth aspect, a host IAB node is provided, comprising:

and the sending module is used for sending an associated group of switching commands to a command receiving node in the IAB network to be switched, wherein the IAB network to be switched comprises an IAB node and a terminal, and the group of switching commands correspond to the IAB node and the terminal in the IAB network to be switched.

In a fifth aspect, a first IAB node is provided, comprising:

a receiving module, configured to receive a first handover command sent by an upstream node of the first IAB node or a source CU network;

and the sending module is used for sending a first indication message under the condition of executing a first switching command to instruct a second IAB node to execute a second switching command associated with the first switching command, wherein the second IAB node is a downstream node of the first IAB node.

In a sixth aspect, a second IAB node is provided, comprising:

The receiving module is used for receiving a first indication message sent by the first IAB node; the first IAB node is an upstream node of the second IAB node, and corresponds to a first switching command;

and the execution module is used for executing a second switching command which corresponds to the second IAB node and is associated with the first switching command.

In a seventh aspect, there is provided a network-side device, including: a memory, a processor and a program or instruction stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the method according to the first or second or third aspect.

In an eighth aspect, there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor implement the steps of the method according to the first or second or third aspects.

In a ninth aspect, a chip is provided, the chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor being configured to execute a network side device program or instruction, to implement the method according to the first aspect or the second aspect or the third aspect.

In the embodiment of the present application, a source CU network sends an associated set of handover commands to a command receiving node in an IAB network to be handed over, where the IAB network to be handed over includes an IAB node and a terminal, and the set of handover commands corresponds to the IAB node and the terminal in the IAB network to be handed over. In the process of switching IAB network, when the target IAB node accords with the condition of the conditional switching command, the switching process of the target IAB node is triggered, and the downstream node needs to be associated with the target IAB node for switching. In order to achieve the objective, the source CU network may associate a handover command of the target IAB node with a handover command of a downstream node that needs to perform association handover with the target IAB node, and send a set of handover commands associated with each other to a command receiving node in the IAB network, so that in a handover process of the target IAB node, the downstream node can respectively obtain the respective corresponding handover command, thereby triggering a handover process of each downstream node, and thus implementing association handover.

Drawings

FIG. 1 is a block diagram of a network system to which embodiments of the present application are applicable;

FIG. 2 is a block diagram of a CU-DU of an IAB system to which embodiments of the present application are applicable;

Fig. 3 is one of flowcharts of a handover method according to an embodiment of the present application;

fig. 4 is a schematic diagram of a network to be switched from a source CU network to a target CU network in an embodiment of the present application;

FIG. 5 is a flow chart of a conditional handoff applicable to an embodiment of the present application;

FIG. 6a is one of the handover command distribution flowcharts of a handover method according to the embodiments of the present application;

fig. 6b is one of the handover command triggering flowcharts of a handover method according to the embodiments of the present application;

FIG. 7a is a second flowchart of a handover command distribution of a handover method according to an embodiment of the present disclosure;

FIG. 7b is a second flowchart of a handover command trigger of a handover method according to an embodiment of the present disclosure;

FIG. 8a is a third flowchart of a handover command distribution of a handover method according to an embodiment of the present disclosure;

FIG. 8b is a third flowchart of a handover command trigger for a handover method according to the embodiments of the present application;

FIG. 9 is a second flowchart of a handover method according to an embodiment of the present disclosure;

FIG. 10 is a third flowchart of a handover method according to an embodiment of the present disclosure;

fig. 11 is a block diagram of a host IAB node according to an embodiment of the present application;

fig. 12 is a block diagram of a first IAB node according to an embodiment of the present application;

Fig. 13 is a block diagram of a second IAB node according to an embodiment of the present application;

fig. 14 is one of the block diagrams of a network side device provided in the embodiment of the present application;

fig. 15 is a second block diagram of a network side device according to an embodiment of the present application.

Detailed Description

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

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the "first" and "second" distinguished objects generally are of the type and do not limit the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/" generally means a relationship in which the associated object is an "or" before and after.

It is noted that the techniques described in embodiments of the present application are not limited to long term evolution (Long Term Evolution, LTE)/LTE evolution (LTE-Advanced, LTE-a) systems, but may also be used in other wireless communication systems, such as code division multiple access (Code Division Multiple Access, CDMA), time division multiple access (Time Division Multiple Access, TDMA), frequency division multiple access (Frequency Division Multiple Access, FDMA), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access, OFDMA), single-carrier frequency division multiple access (Single-carrier Frequency-Division Multiple Access, SC-FDMA), and other systems. The terms "system" and "network" in embodiments of the present application are often used interchangeably, and the techniques described may be used for both the above-mentioned systems and radio technologies, as well as other systems and radio technologies. However, the following description describes a New air interface (NR) system for purposes of example, and NR terminology is used in much of the following description, although these techniques are also applicable to applications other than NR system applications, such as the 6th generation (6th Generation,6G) communication system.

Fig. 1 shows a block diagram of a wireless communication system to which embodiments of the present application are applicable. The wireless communication system includes a terminal 11 and network-side devices (12, 13, and 14). The terminal 11 may also be called a terminal Device or a User Equipment (UE), and the terminal 11 may be a terminal-side Device such as a mobile phone, a tablet Computer (Tablet Personal Computer), a Laptop (Laptop Computer) or a notebook (Personal Digital Assistant, PDA), a palm Computer, a netbook, an ultra-mobile personal Computer (ultra-mobile personal Computer, UMPC), a mobile internet Device (Mobile Internet Device, MID), a Wearable Device (or a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), and the Wearable Device includes: a bracelet, earphone, glasses, etc. Note that, the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side devices (12, 13 and 14) may be base stations or core networks, wherein a base station may be referred to as a node B, an evolved node B, an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a node B, an evolved node B (eNB), a home node B, a home evolved node B, a WLAN access point, a WiFi node, a transmission and reception point (Transmitting Receiving Point, TRP), or some other suitable terminology in the field, and the base station is not limited to a specific technical vocabulary so long as the same technical effect is achieved, and it should be noted that only a base station in the NR system is taken as an example in the embodiment of the present application, but the specific type of the base station is not limited.

In the application, the number of the terminal 11 and the network side device may be plural to constitute an IAB network. Specifically, as shown in fig. 1, the IAB system may include: a home IAB node 12 (i.e., a donor IAB node), an intermediate IAB node 13, and an access IAB node 14, and each IAB node may serve a different terminal. In addition, as shown in fig. 2, the intermediate IAB node 13 and the access IAB node 14 in the IAB system each include a Distributed Unit (DU) function portion and a mobile terminal (MobileTermination, MT) function portion, and the host IAB node 12 includes only the DU function portion. The downstream IAB node may find an upstream IAB node (parent IAB node) by means of the MT and establish a wireless connection with the DU of the upstream IAB node, which wireless connection is called backhaul link. After an IAB node establishes a complete backhaul link, the IAB node opens its DU function, and the DU provides cell services, i.e. the DU may provide access services for the terminal 11. And the host IAB node 12 has a wired transmission network directly connected thereto.

In a self-backhauling loop, all IAB node DUs are connected to one CU network, which configures the DUs through the F1-AP protocol. And the CU may also configure the MT through RRC protocol.

The switching method provided by the embodiment of the application is described in detail below through specific embodiments and application scenarios thereof with reference to the accompanying drawings.

Referring to fig. 3, fig. 3 is a flowchart of a handover method provided in an embodiment of the present application, where the method is used for a source CU network in an IAB system, as shown in fig. 3, and includes the following steps:

step 301, an associated set of handover commands is sent to a command receiving node in an IAB network to be handed over, where the IAB network to be handed over includes an IAB node and a terminal, and the set of handover commands corresponds to the IAB node and the terminal in the IAB network to be handed over.

In application, the above-described associated set of handover commands can be understood as: the plurality of switch commands in the set of switch commands are interrelated, and execution of one switch command in the interrelated set of switch commands can trigger execution of the other switch commands.

The set of switching commands may include a conditional switching command and a switching command, and when the group of switching commands meets the condition of the conditional switching command, the IAB node triggers a switching process; and the IAB node directly triggers the switching process when receiving the corresponding switching command. Specifically, the handover command corresponding to the IAB node connected to the home IAB node (or the IAB node without a parent node in the IAB network to be handed over) may be a conditional handover command, and the handover commands corresponding to other IAB nodes may be conditional handover commands or handover commands.

Specifically, in the process of switching an IAB network, when a target IAB node in the IAB network meets a condition of a conditional switching command thereof, a switching process of the target IAB node is triggered, and a downstream node (including an IAB node and a terminal) of the target IAB node needs to be associated with the target IAB node for switching.

In order to achieve the objective, the source CU network may associate a handover command of the target IAB node with a handover command of a downstream node that needs to perform association handover with the target IAB node, and send a set of handover commands associated with each other to a command receiving node in the IAB network, so that during the handover process of the target IAB node, the downstream node can respectively obtain the handover commands corresponding to the respective downstream node, thereby triggering a handover process of each downstream node to implement association handover.

The source CU network may be a CU network to which the IAB network to be switched is connected before the switching. When one of the IAB nodes triggers the handover from one CU network to the target CU network according to a preset conditional handover command, a part or all of downstream IAB nodes (including at least one other IAB node except the IAB node) in the IAB network where the IAB node is located and terminals served by the part or all of downstream IAB nodes can respectively execute a handover procedure according to the corresponding handover command, so as to handover to the target CU network.

It should be noted that, in the specific implementation, different IAB nodes or terminals in the IAB network to be switched may be switched to different CU networks, or a part of downstream IAB nodes and the terminals served by the downstream IAB nodes may be switched to other target DU nodes of the source CU network, where the difference is that the switching command is different. For convenience of explanation, the following embodiments merely take an example of overall handover of the IAB network to be handed over to the target CU network as an example, which is not limited herein.

In one embodiment: the source CU network may associate a handover command of the target IAB node with a handover command of a downstream node that needs to perform an associated handover with the target IAB node, which may be: when a certain IAB node is switched, a switching command to be executed by a downstream IAB node is defined as a conditional switching command, and the triggering condition of the downstream IAB node switching is that the upstream IAB node is switched according to the corresponding switching command.

In this embodiment, the downstream IAB node can perform association handover with its upstream IAB node.

In another embodiment, the source CU network may associate a handover command of the target IAB node with a handover command of a downstream node that needs to perform an associated handover with the target IAB node, which may be: the set of handover commands associated with each other is defined as a set of handover commands, the handover method further comprising:

And sending second indication information to indicate a switching command set to which the switching command belongs.

I.e. the set of handover commands comprises the set of handover commands associated with each other.

In a specific implementation, when one IAB node triggers a handover to another CU network according to a preconfigured conditional handover command, a corresponding handover command set may be determined, where the handover command set includes a plurality of handover commands to respectively correspond to a downstream IAB node of the IAB node to be handed over and a terminal directly served by the IAB node to be handed over and the downstream IAB node. In this way, when the downstream IAB node and the terminal receive the ID of the switching command set, the corresponding switching commands can be determined from the switching command set indicated by the ID, so as to trigger the respective switching processes and realize the associated switching of the IAB network.

The source CU network, upon sending a handover command for an IAB node, may indicate the handover command set to which the handover command belongs.

Specifically, the second indication information may be transmitted through an F1-AP message or an RRC message. For example: a handover command set indication is added in RRC Reconfiguration IE. The handover command set indication may be a string or a sequence number, and when the IAB node receives the handover command set indication, the IAB node may find a corresponding handover command set.

For example: in the application scenario shown in fig. 4, the to-be-switched IAB network includes an IAB a node, an IAB B node, a UE a served by the IAB a node, and a UE B served by the IAB B node, the source CU network includes a CU a and a DU connected to the CU a, and the target CU network includes a CU B and a DU connected to the CU B. In the process of switching the IAB network to be switched from the CU A to the CU B network, configuring a conditional switching command condHOCmd A to the IAB, configuring a switching command HOCmd B to the IAB, configuring a switching command HOCmd C to the UE A and configuring a switching command HOC md D to the UE B. When the conditional handover command condHOCmd A of IAB A triggers, IAB B, UE A and UE B need to correspondingly execute HOCmd B, HOCmd C and HOCmd D respectively to realize the associated handover to CUB network. At this point, condHOCmd A, HOCmd B, HOCmd C and HOCmd D may be referred to as a handover command set. And condHOCmd A may be a conditional switch command, HOCmd B, HOCmd C and HOCmd D may be unconditional switch commands, or conditional switch commands, not specifically defined herein.

In this embodiment, by setting the handover command set, other nodes can determine and execute other handover commands associated with the handover command according to the handover command set to which the executed handover command belongs, so as to implement associated handover of the IAB network to be handed over.

The precondition for performing the association handover is that one handover command in the handover command set is determined, and in a specific implementation, the handover command may be a conditional triggering command, as shown in fig. 5, and for IAB a, a specific process triggered by the conditional handover command may include the following processes:

step 1, the access and mobility management function (Access and Mobility Management Function) entity provides mobility control information (Mobility control information) to the source base station.

Step 2, the UE (or some IAB node) transmits measurement control and report (measurement control and reports).

And 3, a source base station (source gNB) performs Control Hand-Off decision (CHO decision).

In this step, CHO Decision as described above may include determining whether to initiate a conditional handover procedure for the UE and determining a target base station (target gNB) and potential target base stations (other potential target gNB (s)) that may serve the UE.

And 4, the source base station sends a handover request (Hand Over Request) message to the potential target base station.

Step 5, the potential target base station performs access admission control (admission control).

This step represents that the potential target base station confirms whether it can serve the UE and generates a handover command for the UE to be handed over if it can serve the UE.

Step 6, the potential target base station sends a handover request acknowledgement (handover request acknowledge) message of the UE to the source base station, wherein the handover request acknowledgement carries a handover command.

Step 7, the source base station sends radio resource control (Radio Resource Control, RRC) reconfiguration (RRC reconfiguration) signaling to the UE.

The RRC reconfiguration message carries a handover command and a handover condition of the UE.

And step 8, after receiving the RRC reconfiguration message, the UE returns an RRC reconfiguration complete message.

In this step, the above-mentioned switching process may specifically include: after receiving the RRC reconfiguration signaling, the to-be-switched body (UE or IAB node) feeds back an RRC reconfiguration complete (RRC reconfiguration complete) message to the source base station when the reconfiguration is completed according to the signaling.

And 9, judging whether the switching condition is satisfied (evaluate the CHO conditions).

If the determination result in step 9 is that the switching condition is satisfied, step 10 is executed.

Step 10, separate from the original CU network (detach from the ole cell) and connect to the target CU network (synchronize to the new cell).

In this embodiment, according to a measurement report from a UE, a source base station (source gNB) determines to initiate a conditional handover procedure for the UE and a potential target base station (target gNB) that can serve the UE, and initiates a handover request to the potential target base station, and if the potential target base station confirms that the potential target base station can serve the UE, a handover command is generated for the UE and sent to the source base station. And the source base station sends the switching command and the switching condition to the UE after receiving the switching command from the potential target base station. And after the UE monitors that the switching condition is met, switching to a potential target base station, otherwise, continuing to provide service by the source base station.

Whereas the handover command of the terminal and the IAB node in the network to be handed over is from the source CU network,

that is, in particular embodiments of the present invention, all control commands are sent/distributed by the source CU network, and such distribution may take different forms.

In different modes, the receiving node of the command is different, but when the IAB node receiving the command receives the group of switching commands, the IAB node receiving the command can trigger the switching process of the IAB node at the downstream of the IAB node and the switching process of the terminal served by the IAB node when the IAB node itself executes the switching command or after executing the switching command.

Specifically, after the source CU network distributes the handover command, during the handover performed by the IAB network, the upstream IAB node may send a first indication message to the downstream IAB node, so as to instruct the downstream IAB node to perform the association handover through the first indication message.

In one embodiment, the first indication message may indicate a handover command of the downstream IAB node and the downstream IAB node.

The downstream IAB node triggers the switching process based on the self switching command and sends the switching command of the terminal served by the downstream IAB node to the corresponding terminal, so that each terminal triggers the switching process based on the self switching command, and the associated switching is realized.

In another embodiment, in a case where the downstream IAB node has received the corresponding control command, the first indication message may indicate a handover command set ID to which the handover command executed by the upstream IAB node belongs.

The downstream IAB node can acquire the corresponding switching command set according to the switching command set ID, acquire the respective switching command and the switching command of the terminal served by the respective IAB node, trigger the switching process according to the switching command of the IAB node, and send the switching command of the terminal served by the IAB node to the corresponding terminal, so that each terminal triggers the switching process based on the switching command of the IAB node, and associated switching is realized.

The following illustrates a handover procedure of an IAB network to be handed over in combination with three distribution modes:

case one

The command receiving node includes: and one IAB node in the IAB network to be switched.

This approach belongs to centralized distribution, and all handover commands are distributed to one IAB node in the IAB network to be handed over, specifically the first IAB node directly connected to the source CU network (also understood as an IAB without an upstream IAB node in the network to be handed over), such as IAB a in fig. 6 a.

And triggering the handover of the downstream IAB node (including the handover of the downstream IAB node and the handover of the UE served by the downstream IAB node) after one IAB node in the IAB network to be handed over receives the group of handover commands and performs the handover commands during or after the IAB node itself performs the handover commands. Specifically, in the handover process of the IAB node, a handover command of a terminal served by the IAB node is sent to a corresponding terminal, and a handover command of a downstream IAB node and a handover command of a terminal served by the downstream IAB node are sent to the downstream IAB node.

For example: as shown in fig. 6a and 6B, the IAB node is a downstream node of the IAB a node, and the IAB a node provides a service for UE a, and the IAB node provides a service for UE B. In distributing the handover commands, the source CU network configures the conditional handover command condHOCmd a of IAB a, the handover command HOCmd C of UE a, the handover command HOCmd B of IAB and the handover command HOCmd D of UE B to the same handover command set 1, sends these handover commands to IAB a, and stores these handover commands by IAB a. When the IAB A executes the condHOCmd A to switch, or after the condHOCmd A executes the switch, the switch commands HOCmd B and HOCmd belonging to the same switch command set are sent to the downstream IAB, and HOCmd C is sent to the UE A, so that each downstream node executes the switch according to the respective switch command.

Specifically, IAB A sends UE A's handover command HOCmd C to UE A and IAB's handover command HOCmd B and UE B's handover command HOCmd D to IAB. In this embodiment, the indication message directly carries the handover command. IAB B executes HOCmd B to trigger the switching process of the IAB when HOCmd B and HOCmd D are received, and sends a switching command HOCmd of UE B to trigger the switching of UE B in the switching process or after the switching is finished.

In practice, a downstream node (IAB node or UE) may perform the handover after receiving its own handover command.

In this case, the CU sends all the handover commands of a handover command set (including the handover command of the node itself and the handover commands of its downstream nodes) to an IAB node, which is configured with conditional handover commands belonging to the handover command set, so that the IAB node stores all the handover commands of the handover command set. When the IAB node determines to trigger a handover according to its conditional handover command, the handover command of the handover command set is distributed to a downstream node (IAB node or UE).

Further, in this embodiment, the source CU network may instruct, when sending a handover command to the IAB a node, a handover command set corresponding to the handover command. In this way, the IAB a can determine a corresponding handover command set according to the handover command set indication, and send a handover command corresponding to the UE a in the handover command set to the UE a, and send a handover command corresponding to the IAB B and the UE B in the handover command set to the IAB B, and when receiving the handover commands corresponding to the IAB B and the UE B, the IAB B triggers its own handover procedure, and sends a handover command corresponding to the UE B.

Case two

The command receiving node includes: and the IAB node is used for providing service for the terminal corresponding to the switching command.

This approach is a distributed distribution, where all handover commands are distributed to the corresponding IAB nodes in the IAB network to be handed over, while the handover commands for the UE served by each IAB node are also sent to that IAB.

In a specific implementation, the IAB node corresponding to the handover command and the IAB node serving the terminal corresponding to the handover command may receive the set of handover commands, and acquire the respective corresponding handover commands from the set of handover commands, or the IAB node corresponding to the handover command may receive a handover command corresponding to the IAB node in the set of handover commands, and the IAB node serving the terminal corresponding to the handover command may receive the handover command corresponding to the terminal and the handover command of the IAB node.

When the IAB node corresponding to the switching command acquires the switching command, the IAB node can trigger the switching process of the IAB node, and sends the switching command of the terminal served by the IAB node to the corresponding terminal in the process of executing the switching command or after executing the switching command, so as to trigger the switching process of the terminal.

And at the same time, when the IAB node exists in the downstream IAB node, the IAB node sends an indication message to the downstream IAB node to trigger the downstream IAB node and the terminal served by the downstream IAB node to be switched.

Further, the source CU network may instruct, when sending a handover command to the IAB node, a handover command set corresponding to the handover command. In particular, the indication indicating the handover command set may be carried in a notification message explicitly or implicitly, and the notification message may be indicated with a BAP control PDU or a medium access control element (MAC CE).

Thus, after an IAB node triggers a handover according to a conditional handover command of the handover command set, the associated handover command set can be determined according to the handover command set indication, and an ID of the handover command set is sent to a corresponding downstream node (IAB node) to notify the downstream node to execute a handover command corresponding to the handover command set to perform the handover.

For example: as shown in fig. 7a and fig. 7b, the structure of the IAB network to be switched is the same as that of the IAB network to be switched shown in fig. 6a and fig. 6b, and will not be described again. The switching procedure differs from that shown in fig. 6a and 6b in that: the source CU network sends a conditional switching command condHOCmd A of the IAB A node and a switching command HOCmd C of the UE A to the IAB A, and the conditional switching command condHOCmd A and the switching command HOCmd C of the UE A are stored by the IAB A; the source CU network sends the conditional switch command HOCmd B of the IAB and the switch command HOCmd D of the UE B to the IAB, and the IAB stores the conditional switch command HOCmd B and the switch command HOCmd D of the UE B; while condHOCmd A, HOCmd B, HOCmd C and HOCmd D belong to the same set of handover commands 1, i.e. the 4 handover commands are associated handover commands. After the IAB A triggers the switching according to the condHOCmd A, the IAB A sends a switching command HOCmd C of the UE A to the UE A and sends a notification message to the IAB to notify the IAB to initiate the switching according to the switching command set 1; and after the IAB receives the switching instruction according to the switching instruction set 1, the switching instruction HOCmd D is sent to each UE B, and the HOCmd B is executed to initiate self switching.

In this case, the handover command for each UE in one handover command set may be sent by the source CU to the directly served IAB node for storage, and the handover command for the IAB node is stored by the corresponding IAB node, and when the conditional handover command of the IAB node triggers, a notification message may be sent to the downstream IAB node of the IAB node, so that each IAB node performs the associated handover according to the corresponding handover command set.

Case three

The command receiving node includes: and the parent IAB node of the IAB node corresponding to the switching command and the IAB node for providing service for the terminal corresponding to the switching command.

This approach pertains to centralized distribution, where the handover command of an IAB node in an IAB network to be handed over is distributed to its upstream node, and the UE is distributed to the IAB node serving it.

And if the handover command of the IAB node is sent to the parent IAB node of the IAB node, triggering the handover of the downstream IAB node (including the handover of the downstream IAB node and the handover of the UE served by the downstream IAB node) in the process of executing the handover command or after executing the handover command by the parent IAB node. Specifically, the downstream node obtains a corresponding handover command from the parent IAB node, and receives a handover command of a served terminal thereof sent by the source CU network, so that the terminal obtains the handover command from the IAB node serving the downstream node in the handover process of the IAB node.

For example: as shown in fig. 8a and 8b, the structure of the IAB network to be switched is the same as that of the IAB network to be switched shown in fig. 6a and 6b, and will not be described again. The switching procedure differs from that shown in fig. 6a and 6b in that: the source CU network sends a conditional switch command condHOCmd A of the IAB A node, a switch command HOCmd C of the UE A and a conditional switch command HOCmd B of the IAB to the IAB A, and the IAB A stores the conditional switch commands; the source CU network sends a switching command HOCmd D of the UE B to the IAB, and the IAB stores the switching command HOCmd D; while condHOCmd A, HOCmd B, HOCmd C and HOCmd D belong to the same set of handover commands 1, i.e. the 4 handover commands are associated handover commands. When the IAB A triggers the switching according to the condHOCmd A, the IAB A sends a switching command HOCmd C of the UE A to the UE A, sends a conditional switching command HOCmd B of the IAB to the IAB, and sends a notification message to the IAB to notify the IAB to initiate the switching according to the switching command set 1; and after receiving the HOCmd B and the instruction of the switching command set 1, the IAB sends a switching command HOCmd D to each UE B, and initiates self switching according to the HOCmd B.

In this case, a handover command of an IAB node may be cached by its direct parent IAB node, and when the parent IAB node determines to switch according to a certain handover command set, the corresponding handover command is sent to the IAB node together with an indication of the handover command set; and after receiving the switching command, the IAB node sends the stored switching command to the served UE and the IAB node according to the switching command set instruction. When the conditional switching instruction of the father IAB node triggers, the downstream IAB node can be notified to initiate switching according to the corresponding switching command set through the notification message.

Referring to fig. 9, in conjunction with the above description, fig. 9 is a flowchart of a handover method according to an embodiment of the present application, where the method is applied to a first IAB node in an IAB network to be handed over, as shown in fig. 9, and the method may include the following steps:

step 901, receiving a first handover command sent by an upstream node of the first IAB node or a source CU network.

Step 902, in the case of executing the first handover command, sending a first indication message, instructing a second IAB node to execute a second handover command associated with the first handover command, where the second IAB node is a node downstream of the first IAB node.

In a specific implementation, the first IAB node represents an IAB node having a downstream IAB node in the IAB network to be handed over, and the second IAB node is a downstream node of the first IAB node, for example: the first IAB node is an IAB a node as shown in fig. 6a and the second IAB node is an IAB B node as shown in fig. 6 a. In addition, the first switching command is a switching command corresponding to the first IAB node, and the first IAB node triggers a switching process when receiving the first switching command.

In an implementation, the first handover command is a conditional handover command when the first IAB node is an IAB node in the IAB network to be handed over that is connected to a home IAB node (or is an IAB node without a parent node in the IAB network to be handed over).

In implementation, the first indication message may be used to indicate a second handover command associated with the first handover command, for example: the first indication message may carry indication information of a handover command set, which includes the first handover instruction and the second handover instruction.

In this embodiment, a handover instruction of a downstream IAB node of a first IAB node is stored in the first IAB node, and when the first IAB node triggers handover, a corresponding second handover instruction is sent to each downstream IAB node, so that each downstream IAB node performs associated handover following the first IAB node.

Further, the switching method provided by the embodiment of the application further includes:

receiving a third handover command sent by an upstream node of the first IAB node or a source CU network;

and sending the third switching command to the terminal served by the first IAB node under the condition of executing the first switching command.

The third switching command is a switching command corresponding to the terminal served by the first IAB node, and the switching process of the terminal is triggered when the terminal receives the corresponding third switching command.

For example: the first IAB node is an IAB a node as shown in fig. 6a, and the terminal served by the first IAB node is a UE a as shown in fig. 6 a.

In this embodiment, the first IAB node receives a handover command of a terminal served by the first IAB node, and when the first IAB node triggers handover, the first IAB node sends a corresponding third handover command to each terminal, so that each terminal performs association handover along with the first IAB node.

Further, before sending the first indication message, the handover method provided in the embodiment of the present application further includes:

receiving the second handover command, or a second handover command and a fourth handover command, sent by an upstream node of the first IAB node or a source CU network; the fourth switching command corresponds to the terminal served by the second IAB node;

the first indication information carries the second switching command or carries the second switching command and the fourth switching command.

The fourth switching instruction is a switching instruction corresponding to a terminal served by the second IAB node, for example: in the IAB system shown in fig. 6a, a first IAB node is IAB a, a second IAB node is IAB B, and a terminal served by the second IAB node is UE B.

In this embodiment, the first IAB node can send its handover instruction to the second IAB node through the first instruction information, and can also send a handover instruction of a terminal served by the second IAB node to the second IAB node. In this way, when the first IAB node triggers the handover procedure, the second IAB node and the terminal served by the second IAB node can be associated and switched.

Further, the inter-related handover command is defined as a handover command set, the first indication message indicates the handover command set to which the first handover command belongs, and the second handover command includes at least one of the following handover commands: and the switching command set to which the first switching command belongs corresponds to the second IAB node, and the switching command set to which the first switching command belongs corresponds to the terminal served by the second IAB node.

The switching command set to which the first switching command belongs, the switching command corresponding to the terminal served by the second IAB node, and the fourth switching command in the previous embodiment have the same meaning.

In practical applications, the first IAB node may send a handover instruction and a command set indication to the second IAB node, for example: as shown in fig. 8a and 8B, the IAB a may send a handover instruction of the IAB B to the IAB B and carry a handover command set indication, so that the IAB B can determine a handover command set according to the handover command set indication and determine a handover command of the UE B served by the IAB B from the handover command set indication.

In this embodiment, by setting a group of handover commands associated with each other as one handover command set, it is possible to implement association handover of each node corresponding to each handover command in the handover command set by transmitting indication information of the handover command set, and network resources can be saved.

Further, the inter-related handover command is defined as a handover command set, and the handover method further includes:

and receiving a second indication message, wherein the second indication message indicates a switching command set to which the received switching command belongs.

The meaning of the second indication message may be capable of indicating the same handover command set as the first indication message in the previous embodiment.

In the application, the first IAB node can determine the handover command set to which the received handover command belongs according to the received second indication message, so as to determine each handover command in the handover command set according to the handover command set, and send each handover command to the downstream IAB node and the terminal, or send an indication of the handover command set to the downstream IAB node, so that the downstream IAB node obtains the corresponding handover command in the handover command set according to the indication of the handover command set.

In this embodiment, the first IAB node only needs to receive the second indication message to determine the corresponding handover command in the handover command set, so as to implement the associated handover of the IAB system, and save network resources.

Referring to fig. 10, a flowchart of a handover method for a second IAB node in an IAB network to be handed over according to an embodiment of the present application is shown in fig. 10, where the handover method may include the following steps:

Step 1001, receiving a first indication message sent by a first IAB node; the first IAB node is an upstream node of the second IAB node, and the first IAB node corresponds to a first switching command.

Step 1002, executing a second handover command corresponding to the second IAB node and associated with the first handover command.

The first indication information may include a second handover command corresponding to the second IAB node, or include indication information of a second handover command corresponding to the second IAB node.

In the application, the first IAB node executes the switching process when acquiring the first switching command, and notifies the second IAB node of the second switching command associated with the first switching command, so that the second IAB node executes the switching according to the second switching command when acquiring the second switching command, thereby realizing the associated switching of the first IAB node and the second IAB node.

Further, in an embodiment, the switching method further includes:

receiving a fourth switching command associated with the first switching command;

and sending the fourth switching command to the terminal served by the second IAB node under the condition of executing the second switching command.

For example: in the embodiment shown in fig. 8a and 8B, the IAB a sends indication information carrying a handover instruction of the IAB B to the IAB B, and the IAB B further receives a handover instruction of the UE B sent by the source CU network.

In a specific implementation, the fourth handover command has the same meaning as the fourth handover command in the method embodiment applied to the first IAB node provided in the present application, which is not specifically described herein.

In another embodiment, the first indication message carries the second handover command, or carries the second handover command and a fourth handover command, where the fourth handover command corresponds to a terminal served by the second IAB node and is associated with the first handover command.

In this embodiment, the difference from the above-described receiving of the fourth switching instruction is that in this embodiment, the fourth switching instruction is carried by the first instruction message. For example: as shown in fig. 6B, in the process of triggering handover, the IAB a sends an IAB handover instruction and a UE B handover instruction to the IAB B.

Further, the inter-related handover command is defined as a handover command set, the first indication message indicates the handover command set to which the first handover command belongs, and the second handover command includes at least one of the following handover commands: and among the received switching commands sent by the source CU network, the switching commands which belong to the switching command set indicated by the first indication message and correspond to the second IAB node, and among the received switching commands sent by the source CU network, the switching commands which belong to the switching command set indicated by the first indication message and correspond to the terminal served by the second IAB node.

In this embodiment, by setting a group of handover commands associated with each other as a handover command set, and when a conditional handover command of an IAB node in the handover command set is triggered, the associated triggering of all handover commands in the handover command set can be achieved, and the specific triggering process is the same as the process of performing associated triggering based on the command set in the method embodiment shown in fig. 3, which is not described herein again.

In the application, the second IAB node can determine the handover command set to which the received handover command belongs according to the received second indication message, so as to determine each handover command in the handover command set according to the received handover command set, and send each handover command to the downstream IAB node and the terminal, or send an indication of the handover command set to the downstream IAB node, so that the downstream IAB node obtains the corresponding handover command in the handover command set according to the indication of the handover command set.

In this embodiment, the second IAB node only needs to receive the second indication message to determine the corresponding handover command in the handover command set, so as to implement the associated handover of the IAB system, and save network resources.

Referring to fig. 11, fig. 11 is a block diagram of a home IAB node provided in an embodiment of the present application, where the home IAB node 1100 may include a source CU network in an IAB network to be switched, as shown in fig. 11, and the home IAB node 1100 includes:

a first sending module 1101, configured to send an associated set of handover commands to a command receiving node in an IAB network to be handed over, where the IAB network to be handed over includes an IAB node and a terminal, and the set of handover commands corresponds to the IAB node and the terminal in the IAB network to be handed over.

In one embodiment of the present application, the command receiving node includes: a downstream IAB node in the IAB network to be switched;

or alternatively

The command receiving node includes: the IAB node corresponding to the switching command and the IAB node for providing service for the user terminal corresponding to the switching command;

or alternatively

In one embodiment of the present application, the set of handover commands associated with each other is defined as a set of handover commands, and the home IAB node 1100 further includes:

and the second sending module is used for sending second indication information to indicate a switching command set to which the switching command belongs.

In one embodiment of the present application, the second indication information is sent through an F1-AP message or a radio resource control RRC message.

The host IAB node provided in the embodiment of the present application can implement each process of the method embodiment shown in fig. 3, and can obtain the same beneficial effects, so that repetition is avoided, and no further description is given here.

It should be noted that, in the handover method provided in the embodiment of the present application, the execution body may be a host IAB node shown in fig. 11, or a control module in the host IAB node for executing the handover method. In the embodiment of the present application, the device provided in the embodiment of the present application is described by taking the host IAB node as an example to execute the handover method.

Referring to fig. 12, fig. 12 is a block diagram of a first IAB node provided in an embodiment of the present application, where the first IAB node 1200 may be an IAB node having a downstream IAB node in an IAB network to be switched, and as shown in fig. 12, the first IAB node 1200 includes:

A first receiving module 1201, configured to receive a first handover command sent by an upstream node of the first IAB node or a source concentration unit CU network;

a first execution module 1202, configured to send a first indication message when executing a first handover command, and instruct a second IAB node to execute a second handover command associated with the first handover command, where the second IAB node is a downstream node of the first IAB node.

In one embodiment of the present application, the first switching command is a conditional switching command.

In one embodiment of the present application, the first IAB node 1200 further includes:

a second receiving module, configured to receive a third handover command sent by an upstream node of the first IAB node or a source CU network;

and the third sending module is used for sending the third switching command to the terminal served by the first IAB node under the condition of executing the first switching command.

a third receiving module, configured to receive the second handover command, or a second handover command and a fourth handover command, sent by an upstream node of the first IAB node or a source CU network; the fourth switching command corresponds to the terminal served by the second IAB node;

In one embodiment of the present application, the inter-related handover command is defined as a handover command set, the first indication message indicates a handover command set to which the first handover command belongs, and the second handover command includes at least one of the following handover commands: and the switching command set to which the first switching command belongs corresponds to the second IAB node, and the switching command set to which the first switching command belongs corresponds to the terminal served by the second IAB node.

In one embodiment of the present application, the handover command related to each other is defined as a handover command set, and the first IAB node 1200 further includes:

and the fourth receiving module is used for receiving a second indication message, wherein the second indication message indicates a switching command set to which the received switching command belongs.

The first IAB node 1200 provided in the embodiment of the present application can implement each process in the method embodiment of fig. 9, and in order to avoid repetition, a description is omitted here.

It should be noted that, in the handover method provided in the embodiment of the present application, the execution body may be the first IAB node shown in fig. 12, or a control module in the first IAB node for executing the handover method. In the embodiment of the present application, an example of a handover method performed by a first IAB node is described in the embodiment of the present application.

Referring to fig. 13, fig. 13 is a block diagram of a second IAB node provided in an embodiment of the present application, where the second IAB node 1300 may be an IAB node having an upstream IAB node in an IAB network to be switched, and as shown in fig. 13, the second IAB node 1300 includes:

a fifth receiving module 1301, configured to receive a first indication message sent by the first IAB node; the first IAB node is an upstream node of the second IAB node, and corresponds to a first switching command;

a second execution module 1302 is configured to execute a second handover command corresponding to the second IAB node and associated with the first handover command.

In one embodiment of the present application, the second IAB node 1300 further includes:

a sixth receiving module, configured to receive a fourth switching command associated with the first switching command;

and the fourth sending module is used for sending the fourth switching command to the terminal served by the second IAB node under the condition of executing the second switching command.

In one embodiment of the present application, the first indication message carries the second handover command, or carries the second handover command and a fourth handover command, where the fourth handover command corresponds to a terminal served by the second IAB node and is associated with the first handover command.

In one embodiment of the present application, the inter-related handover command is defined as a handover command set, the first indication message indicates a handover command set to which the first handover command belongs, and the second handover command includes at least one of the following handover commands: and among the received switching commands sent by the source-centralized unit CU network, the switching commands which belong to the switching command set indicated by the first indication message and correspond to the second IAB node, and among the received switching commands sent by the source CU network, the switching commands which belong to the switching command set indicated by the first indication message and correspond to the terminal served by the second IAB node.

In one embodiment of the present application, the handover command associated with each other is defined as a handover command set, and the second IAB node 1300 further includes:

and the seventh receiving module is used for receiving a second indication message, wherein the second indication message indicates a switching command set to which the received switching command belongs.

The home IAB node shown in fig. 11, the first IAB node shown in fig. 12, and the second IAB node shown in fig. 13 may be devices, or may be components, integrated circuits, or chips in a network-side device.

Optionally, as shown in fig. 14, the embodiment of the present application further provides a network side device 1400, which includes a processor 1401, a memory 1402, and a program or an instruction stored in the memory 1402 and capable of being executed on the processor 1401, where the program or the instruction implements each process of the embodiment of the handover method when executed by the processor 1401, and the process can achieve the same technical effect, and for avoiding repetition, a description is omitted herein.

Specifically, the embodiment of the application also provides network side equipment. As shown in fig. 15, the network side device 1500 includes: an antenna 1501, a radio frequency device 1502, a baseband device 1503. The antenna 1501 is connected to a radio frequency device 1502. In the uplink direction, the radio frequency device 1502 receives information via the antenna 1501, and transmits the received information to the baseband device 1503 for processing. In the downlink direction, the baseband device 1503 processes information to be transmitted, and transmits the processed information to the radio frequency device 1502, and the radio frequency device 1502 processes the received information and transmits the processed information through the antenna 1501.

The above-described band processing apparatus may be located in the baseband apparatus 1503, and the method performed by the network side device in the above embodiment may be implemented in the baseband apparatus 1503, where the baseband apparatus 1503 includes the processor 1504 and the memory 1505.

The baseband apparatus 1503 may, for example, include at least one baseband board, on which a plurality of chips are disposed, as shown in fig. 15, where one chip, for example, a processor 1504, is connected to the memory 1505 to call a program in the memory 1505 to perform the network-side device operations shown in the above method embodiment.

The baseband device 1503 may also include a network interface 1506 for interacting with the radio frequency device 1502, such as a common public radio interface (common public radio interface, CPRI for short).

Specifically, the network side device of the embodiment of the present invention further includes: instructions or programs stored in the memory 1505 and executable on the processor 1504, which are called by the processor 1504 to perform the methods performed by the modules shown in fig. 11 or fig. 12 or fig. 13, achieve the same technical effects, and are not repeated here.

The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements a switching method shown in fig. 3 or a switching method shown in fig. 9 or each process of an embodiment of a switching method shown in fig. 10, and the same technical effects can be achieved, so that repetition is avoided, and details are not repeated here.

Wherein the processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium such as a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and the like.

The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to run a network side device program or instruction, to implement the above-mentioned switching method shown in fig. 3 or the switching method shown in fig. 9 or each process of the switching method embodiment shown in fig. 10, and to achieve the same technical effect, so that repetition is avoided, and no further description is given here.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, chip systems, or system-on-chip chips, etc.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), including several instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a base station, etc.) to perform the method described in the embodiments of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims

1. A handover method for a source hub CU network in a self-backhauling IAB system, the handover method comprising:

transmitting an associated set of switching commands to a command receiving node in an IAB network to be switched, wherein the IAB network to be switched comprises an IAB node and a terminal, and the set of switching commands correspond to the IAB node and the terminal in the IAB network to be switched;

wherein the command receiving node includes: an IAB node in the IAB network to be switched; the associated set of handover commands is configured to trigger a handover of a downstream IAB node of the command receiving node after the command receiving node executes the handover command;

or alternatively, the process may be performed,

the command receiving node includes: the IAB node corresponding to the switching command and the IAB node for providing service for the user terminal corresponding to the switching command; the associated group of handover commands is used for triggering the handover of the user terminal served by the IAB node corresponding to the handover command and the downstream IAB node of the IAB node corresponding to the handover command after the IAB node corresponding to the handover command executes the handover command;

or alternatively, the process may be performed,

the command receiving node includes: the parent IAB node of the IAB node corresponding to the switching command and the IAB node for providing service for the terminal corresponding to the switching command; the associated set of handover commands is for triggering a handover of a downstream IAB node of the parent IAB node after the parent IAB node executes the handover commands.

2. The handover method of claim 1, wherein the associated set of handover commands is defined as a set of handover commands, the handover method further comprising:

3. The handover method according to claim 2, wherein the second indication information is transmitted through an F1-AP message or a radio resource control RRC message.

4. A handover method for a first IAB node in a self-backhauled IAB network to be handed over, the handover method comprising:

receiving a first switching command sent by an upstream node of the first IAB node or a source concentration unit CU network;

5. The handover method according to claim 4, wherein the first handover command is a conditional handover command.

6. The handover method according to claim 4, further comprising:

7. The handover method according to claim 4, further comprising, before transmitting the first indication message:

the first indication message carries the second switching command or carries the second switching command and the fourth switching command.

8. The handover method according to any one of claims 4-7, wherein the inter-related handover commands are defined as a handover command set, wherein the first indication message indicates the handover command set to which the first handover command belongs, and wherein the second handover command comprises at least one of the following handover commands: and the switching command set to which the first switching command belongs corresponds to the second IAB node, and the switching command set to which the first switching command belongs corresponds to the terminal served by the second IAB node.

9. The handover method according to any one of claims 4-7, wherein the inter-related handover commands are defined as a set of handover commands, the handover method further comprising:

10. A handover method for a second IAB node in a self-backhauled IAB network to be handed over, the handover method comprising:

receiving a first indication message sent by a first IAB node; the first IAB node is an upstream node of the second IAB node, and corresponds to a first handover command, where the first indication message is sent when the first IAB node executes the first handover command;

11. The handover method according to claim 10, further comprising:

12. The handover method according to claim 10, wherein the first indication message carries the second handover command, or carries the second handover command and a fourth handover command, the fourth handover command corresponding to a terminal served by the second IAB node and being associated with the first handover command.

13. The handover method according to claim 10, wherein the handover command associated with each other is defined as a handover command set, the first indication message indicates the handover command set to which the first handover command belongs, and the second handover command includes at least one of the following handover commands: and among the received switching commands sent by the source-centralized unit CU network, the switching commands which belong to the switching command set indicated by the first indication message and correspond to the second IAB node, and among the received switching commands sent by the source CU network, the switching commands which belong to the switching command set indicated by the first indication message and correspond to the terminal served by the second IAB node.

14. The handover method according to claim 10, 11 or 12, wherein the associated handover command is defined as a handover command set, the handover method further comprising:

15. A host IAB node comprising:

the device comprises a sending module, a receiving module and a switching module, wherein the sending module is used for sending an associated group of switching commands to a command receiving node in an IAB network to be switched, the IAB network to be switched comprises an IAB node and a terminal, and the group of switching commands correspond to the IAB node and the terminal in the IAB network to be switched;

or alternatively, the process may be performed,

Or alternatively, the process may be performed,

16. A first IAB node comprising:

a receiving module, configured to receive a first handover command sent by an upstream node of the first IAB node or a source concentration unit CU network;

17. A second IAB node comprising:

the receiving module is used for receiving a first indication message sent by the first IAB node; the first IAB node is an upstream node of the second IAB node, and corresponds to a first handover command, where the first indication message is sent when the first IAB node executes the first handover command;

18. A network side device, comprising: memory, a processor and a program or instruction stored on the memory and executable on the processor, the program or instruction implementing the steps in the switching method according to any one of claims 1 to 3 when executed by the processor or the steps in the switching method according to any one of claims 4 to 9 when executed by the processor or the steps in the switching method according to any one of claims 10 to 14 when executed by the processor.

19. A readable storage medium, characterized in that the readable storage medium stores thereon a program or an instruction, which when executed by a processor, implements the steps of the switching method according to any one of claims 1 to 3, or the steps of the switching method according to any one of claims 4 to 9, or the steps of the switching method according to any one of claims 10 to 14.