WO2024022341A1

WO2024022341A1 - Cell handover method, terminal, base station, communication system and storage medium

Info

Publication number: WO2024022341A1
Application number: PCT/CN2023/109129
Authority: WO
Inventors: 刘胜楠; 蒋峥; 佘小明
Original assignee: 中国电信股份有限公司
Priority date: 2022-07-28
Filing date: 2023-07-25
Publication date: 2024-02-01
Also published as: CN117528688A

Abstract

The present disclosure relates to the field of wireless communications. Provided are a cell handover method, a terminal, a base station, a communication system and a storage medium. The cell handover method comprises: receiving first indication information sent by a base station, wherein the first indication information comprises one or more of the following information: candidate target cell information, there being one or more candidate target cells, and layer-1 measurement-related configurations; according to the layer-1 measurement-related configurations, executing layer-1 measurement on the candidate target cells, and reporting a measurement result to the base station; receiving second indication information sent by the base station by means of layer-1 or layer-2 signaling, wherein the second indication information comprises target cell information; and according to the target cell information indicated by the second indication information, initiating access to a corresponding target cell. Therefore, the handover signaling processing delay and signaling overheads are effectively reduced.

Description

Cell handover method, terminal, base station, communication system and storage medium

Cross-references to related applications

This application is based on the application with CN application number 202210897377.6 and the filing date is July 28, 2022, and claims its priority. The disclosure content of the CN application is hereby incorporated into this application as a whole.

Technical field

The present disclosure relates to the field of wireless communications, and in particular to a cell switching method, terminal, base station, communication system and storage medium.

Background technique

Compared with the LTE (Long Term Evolution, Long Term Evolution) network, the NR (New Radio) network has a higher cell frequency, so the cell coverage radius becomes smaller, and the user equipment (User Equipment, UE) will experience more trouble in the network. Frequent serving cell change processes, such as primary cell (Primary Cell, Pcell) and primary secondary cell (Primary Secondary Cell, PScell) changes, as well as the addition and release process of secondary cell (Secondary Cell, SCell), etc.

When a terminal moves from the coverage area of one cell to another cell, it needs to change the serving cell at a certain moment. The current serving cell change process is based on Layer 3 (Layer 3, L3) measurement and is triggered by RRC (Radio Resource Control, Radio Resource Control) signaling. All processes require complete Layer 2 (Layer 2, L2) and One (Layer 1, L1) reset, thus introducing more delay and signaling overhead.

Contents of the invention

Some embodiments of the present disclosure provide a cell switching method, which is applied to terminals, including:

Receive first indication information sent by the base station, where the first indication information includes one or more of the following information: candidate target cell information, where there are one or more candidate target cells; layer one measurement related configuration;

According to the layer one measurement related configuration, perform layer one measurement on the candidate target cell and report the measurement results to the base station;

Receive second indication information sent by the base station through layer one or layer two signaling, where the second indication information includes target cell information;

Initiate access to the corresponding target cell according to the target cell information indicated by the second indication information.

In some embodiments, the first indication information also includes one or more of the following information:

Mobility indication information, which is used to instruct the terminal to perform cell switching based on layer one or layer two signaling, such as L1/L2 mobility indicator IE or other named information elements with the same indication function;

Validity time of relevant configuration;

The maximum allowed number of consecutive executions of cell handovers based on layer one or layer two signaling, such as maximum frequency L1/L2 mobility indication IE or other names with the same indication function.

In some embodiments, the second indication information also includes timing advance adjustment indication information, used to indicate the timing advance offset value between the target cell and the source cell;

Initiating access to the corresponding target cell includes:

According to the timing advance of the source cell and the timing advance offset value between the target cell and the source cell indicated by the timing advance adjustment indication information, the timing advance of the target cell is determined, and the timing advance of the target cell is determined according to the timing advance of the target cell. Initiate access.

In some embodiments, the second indication information also includes information about the target beam of the target cell;

Initiating access to the corresponding target cell includes:

According to the target cell information indicated by the second indication information and the target beam information of the target cell, access is initiated to the target beam in the corresponding target cell.

In some embodiments, the layer one signaling is downlink control information DCI, and the layer two signaling is media access control MAC control element CE.

In some embodiments, it also includes: obtaining the target cell information from the transmission configuration indication TCI field in the DCI; or obtaining the target cell information from the serving cell identification field or the TCI status identification field in the MAC CE.

In some embodiments, the method further includes: if the first indication information includes a valid time, starting a timer after receiving the first indication information; if the time of the timer reaches the valid time indicated by the first indication information, The maximum value indicates that the base station validity time has reached the maximum value through MAC CE or uplink control information UCI, and the relevant configuration indicated by the first indication information is released.

In some embodiments, the method further includes: if the first indication information includes the maximum number of consecutive executions of cell switching based on layer one or layer two signaling, starting a counter after receiving the first indication information, and if the counter records The number of times the terminal performs cell switching based on layer one or layer two signaling reaches the maximum number of times indicated by the first indication information, and the terminal indicates through MAC CE or UCI that the base station has reached the maximum number of times, and releases the relevant configuration indicated by the first indication information.

In some embodiments, receiving the first indication information sent by the base station includes: receiving the base station through radio resource control Control the first indication information sent by RRC signaling, where the RRC signaling is RRC Reconfiguration signaling.

Some embodiments of the present disclosure provide a cell switching method, which is applied to a base station, including:

Send first indication information to the terminal, where the first indication information includes one or more of the following information: candidate target cell information, where there are one or more candidate target cells; layer one measurement related configuration;

Receive the measurement results that the terminal performs layer one measurement on the candidate target cell according to the layer one measurement related configuration and reports;

Determine the target cell according to the measurement results, and send second indication information to the terminal through layer one or layer two signaling. The second indication information includes target cell information and is used to instruct the terminal to switch to the target. community.

Mobility indication information, the mobility indication information is used to instruct the terminal to perform cell switching based on layer one or layer two signaling;

Validity time of relevant configuration;

The maximum allowed number of consecutive cell handovers based on Layer 1 or Layer 2 signaling.

In some embodiments, the second indication information also includes timing advance adjustment indication information, used to indicate the timing advance offset value between the target cell and the source cell, so that the terminal can determine the timing advance amount of the target cell, and Initiate access to the target cell.

In some embodiments, the method further includes: the second indication information further includes information about the target beam of the target cell, so that the terminal initiates access to the target beam in the corresponding target cell.

In some embodiments, the transmission configuration in the DCI indicates that the TCI field sets the target cell information.

In some embodiments, the target cell information is set in the serving cell identification field or the TCI status identification field in the MAC CE.

In some embodiments, sending the first indication information to the terminal includes: sending the first indication information to the terminal through radio resource control RRC signaling.

In some embodiments, the method further includes: delivering new first indication information to the terminal through RRC signaling.

Some embodiments of the present disclosure provide a terminal, including: a memory; and a processor coupled to the memory, the processor being configured to execute the cell switching method of each embodiment based on instructions stored in the memory. .

Some embodiments of the present disclosure provide a base station, including: a memory; and a processor coupled to the memory, the processor being configured to execute the cell switching method of each embodiment based on instructions stored in the memory. .

Some embodiments of the present disclosure provide a communication system, including: a terminal; and a base station.

Some embodiments of the present disclosure provide a non-transitory computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the cell switching method of each embodiment are implemented.

Description of drawings

The drawings needed to be used in the description of the embodiments or related technologies will be briefly introduced below. The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings.

Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 shows a schematic diagram of the 5G wireless network architecture.

Figure 2 shows a schematic diagram of the protocol layer division of CU, DU and AAU of a 5G base station.

Figure 3 shows a schematic diagram of cell handover under the CU-DU separation architecture.

Figure 4 shows a schematic flowchart of a cell handover method based on L1 measurement reporting and L1/L2 signaling indication control according to some embodiments of the present disclosure.

Figure 5 shows a schematic diagram of cell handover in a single connection scenario.

Figure 6A shows a schematic diagram of the change of primary and secondary cells in a dual connectivity scenario.

Figure 6B shows a schematic diagram of secondary cell changes in a carrier aggregation scenario.

Figure 7 shows a schematic diagram of a terminal according to some embodiments of the present disclosure.

Figure 8 shows a schematic diagram of a base station according to some embodiments of the present disclosure.

Figure 9 shows a schematic structural diagram of a communication system according to some embodiments of the present disclosure.

Detailed ways

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure.

Unless otherwise specified, descriptions such as "first" and "second" in this disclosure are used to distinguish different objects and are not used to express meanings such as size or timing.

The embodiment of the present disclosure triggers the terminal to change the serving cell based on L1 measurement reporting and L1/L2 signaling indication control. The process can effectively reduce handover signaling processing delay and signaling overhead, and related configurations can be configured once and reused multiple times, which can effectively reduce network signaling load and delay in mobility scenarios.

Figure 1 shows a schematic diagram of the 5G wireless network architecture.

As shown in Figure 1, the fifth generation mobile communication technology (5th Generation Mobile Communication Technology, referred to as 5G) network includes 5G core network and 5G base station. Among them, 5G base stations adopt a separate architecture of CU (Centralized Unit) and DU (Distributed Unit), including CU, DU and AAU (Active Antenna Unit).

As shown in Figure 2, CU includes RRC (Radio Resource Control, Radio Resource Control) layer and PDCP (Packet Data Convergence Protocol, Packet Data Convergence Protocol) layer, DU includes RLC (Radio Link Control, Radio Link Control) layer, MAC (medium access control, media access control) layer and High-PHY (high physical) layer, AAU includes Low-PHY (low physical) layer, RF (Radio Frequency, radio frequency) layer and antenna, etc.

Among them, layer one refers to the physical layer, layer two refers to the MAC layer, and layer three refers to the RRC layer.

As shown in Figure 3, one CU controls multiple DUs, and each DU manages multiple cells. Each cell can be identified by PCI (Physical Cell Identifier, physical cell identifier). When the terminal moves in the network, it will switch from the cell managed by DU-1 to the cell managed by DU-2, and then to the cell managed by DU-3, resulting in a change in the serving cell. Considering that cells managed by different DUs under the same CU can obtain the TA timing advance through TA (Timing Advance) management, the terminal switches from a cell managed by DU-1 to a cell managed by DU-2 and DU-3. There is no need to perform the synchronization process during the cell process. In the inter-DU (i.e., Intra-CU inter-DU) scenario within the same CU, triggering the terminal to perform the serving cell change process based on L1 measurement reporting and L1/L2 signaling indication control can effectively reduce handover signaling processing delay and Signaling overhead, and related configurations can be configured once and reused multiple times, which can effectively reduce network signaling load and delay in mobility scenarios.

In step 401, the terminal receives the first indication information sent by the base station through RRC (Radio Resource Control, Radio Resource Control) signaling. The RRC signaling is RRC Reconfiguration signaling.

The first indication information includes one or more of the following information (1-5):

(1) Candidate target cell information (identification or index), there are one or more candidate target cells;

(2) Layer 1 measurement related configuration, that is, physical layer (Physical Layer, namely Layer1, L1) measurement related configuration,

For example, RSRP (Reference Singal Receiving Power, reference signal receiving power)/RSRQ (Reference Signal Receiving Quality, reference signal receiving quality)/SINR (Signal to Interference plus Noise Ratio, signal and interference plus noise ratio) measurement, beam level measurement, measurement cycle and reporting cycle, etc.

(3) Mobility indication information, which is used to instruct the terminal to perform cell switching based on layer one or layer two signaling, such as L1/L2 mobility indicator IE or other named information elements with the same indication function;

(4) Validity time of relevant configuration;

(5) The maximum allowed number of consecutive cell handovers based on layer one or layer two signaling, such as maximum frequency L1/L2 mobility indication IE or other names with the same indication function.

In step 402, the terminal performs layer 1 measurement on the candidate target cell according to the layer 1 measurement related configuration, and reports the measurement result to the base station.

In step 403, the base station determines the target cell according to the measurement result, and sends second indication information to the terminal through layer 1 or layer 2 signaling.

The second indication information includes target cell information (identification or index) and is used to instruct the terminal to switch to the target cell.

The second indication information also includes timing advance adjustment indication information, which is used to indicate the timing advance offset value between the target cell and the source cell, so that the terminal can determine the timing advance amount of the target cell and initiate access to the target cell. .

The second indication information also includes information about the target beam of the target cell, so that the terminal initiates access to the target beam in the corresponding target cell.

The layer one signaling is downlink control information (DCI), and the target cell information is set in the TCI (Transmission Configuration Indication) field in the DCI.

The layer 2 signaling is MAC CE (Control Element, control unit), and the target cell information is set in the serving cell identification field or the TCI status identification field in the MAC CE.

In step 404, the terminal receives the second indication information sent by the base station through layer one or layer two signaling.

The layer one signaling is DCI, and the target cell information is obtained from the TCI field in DCI.

The layer 2 signaling is MAC CE, and the target cell information is obtained from the serving cell identification field or the TCI status identification field in the MAC CE.

In step 405, the terminal initiates access to the corresponding target cell according to the target cell information indicated by the second indication information. Since the terminal obtains the TA offset value in advance, it does not need to perform the RACH (Random Access Channel) process, reducing access delay.

The terminal determines the timing advance of the target cell based on the timing advance of the source cell and the timing advance offset value between the target cell and the source cell indicated by the timing advance adjustment indication information, and sends the signal to the target according to the timing advance of the target cell. The cell initiates access.

The terminal initiates access to the target beam in the corresponding target cell according to the target cell information indicated by the second indication information and the target beam information of the target cell.

In step 406, the terminal saves the relevant configuration in the first indication information, and continues to perform layer 1 measurement and reporting until one of the following conditions (1-3) is met:

(1) If the first indication information includes the relevant configured valid time, the terminal starts a timer after receiving the first indication information. If the timer reaches the maximum value of the valid time indicated by the first indication information, , indicating that the base station validity time has reached the maximum value through MAC CE or UCI (Uplink Control Information), and releasing the relevant configuration indicated by the first indication information.

(2) If the first indication information includes the maximum number of consecutive cell handovers based on layer one or layer two signaling, the terminal starts a counter after receiving the first indication information. If the counter records that the terminal is based on layer one or layer two signaling, the counter is started. When the number of cell handovers performed by Layer 2 signaling reaches the maximum number of times indicated by the first indication information, the base station is instructed through MAC CE or UCI that the maximum number of times has been reached, and the relevant configuration indicated by the first indication information is released.

(3) The base station delivers new first instruction information to the terminal through RRC signaling, that is, the base station delivers a new handover configuration or handover instruction to the terminal.

The disclosed embodiment is based on L1 measurement reporting and L1/L2 signaling indication control, triggering the terminal to perform the serving cell change process, which can effectively reduce the handover signaling processing delay and signaling overhead, and the related configuration can be configured once and repeated multiple times. It can effectively reduce network signaling load and delay in mobility scenarios.

The cell handover method based on L1 measurement reporting and L1/L2 signaling indication control can be applied to cell handover scenarios, including but not limited to cross-DU cell handover scenarios within the same CU or cross-CU cell handover scenarios. For example, the serving cell changes in a single connection scenario (as shown in Figure 5), and the primary cell (Pcell) or primary and secondary cells (PScell) in a dual connection scenario. Change (as shown in Figure 6A), and the primary cell (Pcell) or secondary cell (Scell) changes in the carrier aggregation scenario (as shown in Figure 6B).

Figure 5 shows a schematic diagram of cell handover in a single connection scenario. In dense cell scenarios, such as Ultra Dense Network (UDN) scenarios, as shown in Figure 5, the UE moves in the dense cell scenario, and the serving cell changes from {Cell1} to {Cell3} and then to {Cell4}.

Figure 6A shows a schematic diagram of the change of primary and secondary cells in a dual connectivity scenario. As shown in Figure 6A, the UE moves in the dual connectivity scenario, and the serving cell changes from {Pcell1} to {Pcell1, PScell3} and then to {Pcell1, PScell4}, in which the primary and secondary cells PScell have changed.

Figure 6B shows a schematic diagram of secondary cell changes in a carrier aggregation scenario. As shown in Figure 6B, the UE moves in the carrier aggregation scenario, and the serving cell changes from {Pcell1} to {Pcell1, Scell3} and then to {Pcell1, Scell4}, in which the secondary cell changes. In the same way, this solution is also suitable for the primary cell (Pcell) change or the primary cell and secondary cell (Scell) exchange scenario in the carrier aggregation scenario.

In each of the above scenarios, triggering the terminal to perform the serving cell change process based on L1 measurement reporting and L1/L2 signaling indication control can effectively reduce handover signaling processing delay and signaling overhead, and related configurations can be configured once and multiple times. Multiplexing can effectively reduce network signaling load and delay in mobility scenarios.

As shown in Figure 7, the terminal 700 of this embodiment includes: a memory 710 and a processor 720 coupled to the memory 710. The processor 720 is configured to execute any of the foregoing embodiments based on instructions stored in the memory 710. Cell switching method performed by the terminal.

Validity time of relevant configuration;

Initiating access to the corresponding target cell includes:

In some embodiments, it also includes:

Obtain target cell information from the transmission configuration indication TCI field in DCI; or,

Obtain the target cell information from the serving cell identification field or TCI status identification field in the MAC CE.

In some embodiments, the method further includes: if the first indication information includes a valid time, starting a timer after receiving the first indication information, and if the time of the timer reaches the valid time indicated by the first indication information, The maximum value indicates that the base station validity time has reached the maximum value through MAC CE or uplink control information UCI, and the relevant configuration indicated by the first indication information is released.

In some embodiments, receiving the first indication information sent by the base station includes: receiving the first indication information sent by the base station through radio resource control RRC signaling.

The terminal 700 may also include an input/output interface 730, a network interface 740, a storage interface 750, and the like. These interfaces 730, 740, 750, the memory 710 and the processor 720 may be connected through a bus 760, for example. Among them, the input and output interface 730 provides a connection interface for input and output devices such as a monitor, mouse, keyboard, and touch screen. Network Interface 740 provides connection interfaces for various networked devices. The storage interface 750 provides a connection interface for external storage devices such as SD cards and USB disks. Bus 760 may use any of a variety of bus structures. For example, bus structures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MCA) bus, and Peripheral Component Interconnect (PCI) bus.

As shown in Figure 8, the base station 800 of this embodiment includes: a memory 810 and a processor 820 coupled to the memory 810. The processor 820 is configured to execute any of the foregoing embodiments based on instructions stored in the memory 810. Cell handover method performed by base station.

Validity time of relevant configuration;

The base station 800 may also include an input and output interface 830, a network interface 840, a storage interface 850, and the like. These interfaces 830, 840, 850, the memory 810 and the processor 820 may be connected through a bus 860, for example. Among them, the input and output interface 830 provides a connection interface for input and output devices such as a monitor, mouse, keyboard, and touch screen. Network interface 840 provides a connection interface for various networked devices. The storage interface 850 provides a connection interface for external storage devices such as SD cards and USB disks. Bus 860 may use any of a variety of bus structures. For example, the bus structure includes but is not limited to the Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MCA) bus, and Peripheral Component Interconnect (PCI) bus.

As shown in Figure 9, the communication system 900 of this embodiment includes: a terminal 700; and a base station 800. The base station 800 can control multiple terminals 700.

Those skilled in the art will appreciate that embodiments of the present disclosure may be provided as methods, systems, or computer program products. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment that combines software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more non-transitory computer-readable storage media (including, but not limited to, disk memory, CD-ROM, optical storage, etc.) embodying computer program code therein. .

The disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each process and/or block in the flowchart illustrations and/or block diagrams, and combinations of processes and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device produce a use A device for realizing the functions specified in one process or multiple processes of the flowchart and/or one block or multiple blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory that causes a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction means, the instructions The device implements the functions specified in a process or processes of the flowchart and/or a block or blocks of the block diagram.

These computer program instructions may also be loaded onto a computer or other programmable data processing device, causing a series of operating steps to be performed on the computer or other programmable device to produce computer-implemented processing, thereby executing on the computer or other programmable device. Instructions provide steps for implementing the functions specified in a process or processes of a flowchart diagram and/or a block or blocks of a block diagram.

The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection of the present disclosure. within the range.

Claims

A cell switching method, applied to terminals, including:

Receive first indication information sent by the base station, where the first indication information includes one or more of the following information: candidate target cell information, where there are one or more candidate target cells; layer one measurement related configuration;

Perform layer one measurements on the candidate target cells and report the measurement results to the base station;

Receive second indication information sent by the base station through layer one or layer two signaling, where the second indication information includes target cell information;

Initiate access to the corresponding target cell according to the target cell information indicated by the second indication information.
The method according to claim 1, the first indication information further includes one or more of the following information:

Mobility indication information, the mobility indication information is used to instruct the terminal to perform cell switching based on layer one or layer two signaling;

Validity time of relevant configuration;

The maximum allowed number of consecutive cell handovers based on Layer 1 or Layer 2 signaling.
According to the method of claim 1 or 2, the second indication information further includes timing advance adjustment indication information, used to indicate the timing advance offset value between the target cell and the source cell;

Initiating access to the corresponding target cell includes:

According to the timing advance of the source cell and the timing advance offset value between the target cell and the source cell indicated by the timing advance adjustment indication information, the timing advance of the target cell is determined, and the timing advance of the target cell is determined according to the timing advance of the target cell. Initiate access.
According to the method of claim 1 or 2, the second indication information also includes information about the target beam of the target cell;

Initiating access to the corresponding target cell includes:

According to the target cell information indicated by the second indication information and the target beam information of the target cell, access is initiated to the target beam in the corresponding target cell.
The method according to claim 1 or 2,

The layer 1 signaling is downlink control information DCI, and the layer 2 signaling is media access control MAC control element CE.
The method of claim 5, further comprising:

Obtain target cell information from the transmission configuration indication TCI field in DCI; or,

Obtain the target cell information from the serving cell identification field or TCI status identification field in the MAC CE.
The method of claim 2, further comprising:

If the first indication information includes a valid time, the timer is started after receiving the first indication information. If the time of the timer reaches the maximum value of the valid time indicated by the first indication information, the timer is started through MAC CE or uplink. The road control information UCI indicates that the validity time of the base station has reached the maximum value, and the relevant configuration indicated by the first indication information is released.
The method of claim 2, further comprising:

If the first indication information includes the maximum number of consecutive cell handovers based on Layer 1 or Layer 2 signaling, the counter is started after receiving the first indication information. If the terminal recorded in the counter is based on Layer 1 or Layer 2 signaling, When the number of cell handovers reaches the maximum number of times indicated by the first indication information, the base station is instructed through MAC CE or UCI that the maximum number of times has been reached, and the relevant configuration indicated by the first indication information is released.
According to the method of claim 1 or 2, receiving the first indication information sent by the base station includes:

Receive first indication information sent by the base station through radio resource control RRC signaling.
A cell switching method, applied to base stations, including:

Send first indication information to the terminal, where the first indication information includes one or more of the following information: candidate target cell information, where there are one or more candidate target cells; layer one measurement related configuration;

Receive the measurement results that the terminal performs layer one measurement on the candidate target cell and reports;

Determine the target cell according to the measurement results, and send second indication information to the terminal through layer one or layer two signaling. The second indication information includes target cell information and is used to instruct the terminal to switch to the target. community.
According to the method of claim 10, the first indication information further includes one or more of the following information:

Mobility indication information, the mobility indication information is used to instruct the terminal to perform cell switching based on layer one or layer two signaling;

Validity time of relevant configuration;

The maximum allowed number of consecutive cell handovers based on Layer 1 or Layer 2 signaling.
According to the method of claim 10 or 11, the second indication information further includes timing advance adjustment indication information, used to indicate the timing advance offset value between the target cell and the source cell, so that the terminal determines the timing advance offset value of the target cell. Timing advance amount and initiates access to the target cell.
The method according to claim 10 or 11, further comprising: the second indication information further includes information about the target beam of the target cell, so that the terminal initiates access to the target beam in the corresponding target cell.
According to the method of claim 10 or 11, the layer one signaling is downlink control information DCI, and the layer two signaling is a media access control MAC control element CE.
The method of claim 14,

The transmission configuration indication TCI field in DCI sets the target cell information; or,

Set the target cell information in the serving cell identification field or TCI status identification field in the MAC CE.
A method according to claim 10 or 11,

Sending the first indication information to the terminal includes: sending the first indication information to the terminal through radio resource control RRC signaling; or,

It also includes: delivering new first indication information to the terminal through RRC signaling.
According to the method of any one of claims 1 to 16, performing layer one measurement on the candidate target cell includes: performing layer one measurement on the candidate target cell according to the layer one measurement related configuration.
A terminal that includes:

A memory; and a processor coupled to the memory, the processor being configured to execute the cell switching method of any one of claims 1-9 and 17 based on instructions stored in the memory.
A base station including:

A memory; and a processor coupled to the memory, the processor being configured to execute the cell switching method of any one of claims 10-16 and 17 based on instructions stored in the memory.
A communications system including:

The terminal according to claim 18; and,

The base station of claim 19.
A non-transitory computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the cell switching method described in any one of claims 1-16 and 17 are implemented.
A computer program consisting of:

Instructions, which when executed by a processor cause the processor to execute the cell switching method according to any one of claims 1-17.