CN114339914A - Cell switching method, device, network equipment and storage medium - Google Patents
Cell switching method, device, network equipment and storage medium Download PDFInfo
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Abstract
The application relates to a cell switching method, a cell switching device, network equipment and a storage medium, and belongs to the technical field of communication. The method comprises the following steps: in response to receiving the configuration completion notification of the terminal, sending a first release instruction to the terminal, wherein the first release instruction indicates to release the connection with the source cell; and in response to receiving a release completion notification of the terminal for the first release indication, sending a second release indication to the second network equipment, wherein the second release indication indicates that the connection between the source cell and the terminal is released, and the second network equipment provides communication service for the source cell. According to the scheme, the configuration information of the terminal can be reserved in the network equipment corresponding to the source cell before the switching is completed, so that if the cell switching fails, the connection between the terminal and the source cell can be recovered, network searching and connection establishment are not required to be carried out again, and further network delay is reduced.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a cell switching method, an apparatus, a network device, and a storage medium.
Background
In a wireless communication system, a terminal often needs to perform cell handover, i.e., handover from a source cell to a target cell. In order to ensure that the communication of the terminal is not interrupted in the process of switching the cell, a Dual Active Protocol Stack (DAPS) Handover (HO) technology is introduced. When the cell switching is carried out based on the DAPS HO technology, the terminal keeps the connection with the source cell, carries out data synchronization to the target cell and realizes the connection establishment, and when the connection establishment is completed, the network equipment firstly informs the source cell of successful switching, releases the wireless resource and configuration information of the terminal in the source cell, and then informs the terminal of deleting the configuration information of the source cell and releases the connection with the source cell.
In the related art, after the connection is established, when a radio link failure occurs in a target cell, a terminal deletes configuration information of a source cell and the target cell based on a protocol, then performs network search, and initiates a connection establishment process to a new cell searched by the network.
In the related art, since it is necessary to initiate a network search again and then initiate a connection establishment procedure to a new cell, a delay in the connection establishment procedure is long, and communication interruption of the terminal is caused.
Disclosure of Invention
The embodiment of the application provides a cell switching method, a cell switching device, network equipment and a storage medium, which can reduce network delay. The technical scheme is as follows:
in one aspect, a cell handover method is provided, where the method is performed by a first network device, and the first network device provides a communication service for a target cell, and the method includes:
in response to receiving a configuration completion notification of a terminal, sending a first release instruction to the terminal, wherein the first release instruction indicates to release connection with a source cell;
and in response to receiving a release completion notification of the terminal for the first release indication, sending a second release indication to a second network device, wherein the second release indication indicates that the connection between the source cell and the terminal is released, and the second network device provides a communication service for the source cell.
In another aspect, a cell handover method is provided, where the method is performed by a second network device, and the second network device provides a communication service for a source cell, and the method includes:
and in response to receiving a second release instruction of the terminal, releasing the connection between the source cell and the terminal, wherein the second release instruction is sent after the terminal releases the connection with the source cell based on the first release instruction after receiving the first release instruction sent by the first network equipment, and the first network equipment is used for providing communication service for the target cell.
In another aspect, a cell handover method is provided, where the method is performed by a terminal, and the method includes:
after the target cell is switched to, sending a configuration completion notification to a first network device, wherein the first network device is used for providing communication service for the target cell;
responding to a first release instruction sent by the first network equipment, releasing the connection with the source cell, and sending a release completion notification of the first release instruction to the first network equipment, wherein the release completion notification of the first release instruction is used for instructing the first network equipment to send a second release instruction to a second network equipment, and the second release instruction is used for instructing the second network equipment to release the connection between the source cell and the terminal.
In another aspect, an apparatus for cell handover is provided, where the apparatus is performed by a first network device, and the first network device provides a communication service for a target cell, and the apparatus includes:
a first sending module, configured to send a first release instruction to a terminal in response to receiving a configuration completion notification of the terminal, where the first release instruction instructs to release a connection with a source cell;
a second sending module, configured to send a second release indication to a second network device in response to receiving a release completion notification for the first release indication by the terminal, where the second release indication indicates to release the connection between the source cell and the terminal, and the second network device provides a communication service for the source cell.
In another aspect, an apparatus for cell handover is provided, where the apparatus is performed by a second network device, and the second network device provides a communication service for a source cell, and the apparatus includes:
a first release module, configured to release, in response to receiving a second release instruction of a terminal, a connection between a source cell and the terminal, where the second release instruction is sent after the terminal receives a first release instruction sent by a first network device, and based on the first release instruction, the terminal releases the connection with the source cell, and the first network device is configured to provide a communication service for a target cell.
In another aspect, an apparatus for cell handover is provided, the apparatus being performed by a terminal, and the apparatus including:
a third sending module, configured to send a configuration completion notification to a first network device after switching to a target cell, where the first network device is configured to provide a communication service for the target cell;
a second release module, configured to release, in response to a first release indication sent by the first network device, a connection with a source cell, and send a release completion notification of the first release indication to the first network device, where the release completion notification of the first release indication is used to indicate the first network device to send a second release indication to a second network device, and the second release indication is used to indicate the second network device to release the connection between the source cell and the terminal.
In another aspect, a first network device is provided, the first network device comprising a processor and a memory; the memory stores at least one program code for execution by the processor to implement the cell handover method as in any above.
In another aspect, a second network device is provided, the second network device comprising a processor and a memory; the memory stores at least one program code for execution by the processor to implement the cell handover method as in any above.
In another aspect, a terminal is provided that includes a processor and a memory; the memory stores at least one program code for execution by the processor to implement the cell handover method as in any above.
In another aspect, a computer-readable storage medium is provided, which stores at least one program code for execution by a processor to implement the cell handover method according to any of the above aspects.
In another aspect, a computer program product is provided, which stores at least one program code, which is loaded and executed by a processor to implement the cell handover method according to any of the above aspects.
In the embodiment of the application, when the cell switching is successful, the first network device firstly indicates the terminal to release the connection, and after the terminal release is completed, the second network device is indicated to release the connection, so that the configuration information of the terminal can be reserved in the network device corresponding to the source cell before the switching is completed, and therefore if the cell switching fails, the connection between the terminal and the source cell can be recovered, network searching and connection establishment do not need to be carried out again, and network delay is reduced.
Drawings
Fig. 1 is a schematic diagram illustrating an implementation environment related to a cell handover method according to an exemplary embodiment of the present application;
fig. 2 is a flowchart illustrating a cell handover method according to an exemplary embodiment of the present application;
fig. 3 is a flowchart illustrating a cell handover method according to an exemplary embodiment of the present application;
fig. 4 is a flowchart illustrating a cell handover method according to an exemplary embodiment of the present application;
fig. 5 is a flowchart illustrating a cell handover method according to an exemplary embodiment of the present application;
fig. 6 is a timing flow diagram illustrating a method for cell handover in accordance with an exemplary embodiment of the present application;
fig. 7 is a flowchart illustrating a method for cell handover according to an exemplary embodiment of the present application;
fig. 8 is a timing flow diagram illustrating a method for cell handover in accordance with an exemplary embodiment of the present application;
fig. 9 shows a block diagram of a cell switching apparatus according to an example embodiment of the present application;
fig. 10 shows a block diagram of a cell switching apparatus according to an example embodiment of the present application;
fig. 11 is a block diagram illustrating a cell switching apparatus according to an exemplary embodiment of the present application;
fig. 12 shows a block diagram of a terminal according to an exemplary embodiment of the present application;
fig. 13 is a block diagram illustrating a network device according to an exemplary embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Reference herein to "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The following is a brief introduction to several terms involved in the present application:
a cell: also called a cell, refers to the area covered by one or a part of a base station (sector antenna) in a cellular mobile communication system, in which a terminal can reliably communicate with the base station over a radio channel.
Cell switching: and switching the server cell from the current serving cell to other serving cells when the terminal moves or in other cases. The cell before handover is referred to as a source cell, and the cell after handover is referred to as a target cell.
Dual Active Protocol Stack Handover (DAPS HO): a cell switching standard in the communication industry can ensure that a terminal keeps communication in the cell switching process.
Referring to fig. 1, a schematic diagram of an implementation environment related to a cell handover method according to an exemplary embodiment of the present application is shown. Referring to fig. 1, the implementation environment includes a terminal 10, a first network device 20, and a second network device 30. The terminal 10, the first network device 20 and the second network device 30 are all connected through a network.
The first network device 20 and the second network device 30 are any network devices having a wireless transceiving function. For example, the first network device 20 and the second network device 30 may be a base station, an evolved Node B (eNB), a next Generation Node B (gNB), an Access Point (AP) in a Wireless Fidelity (WIFI) system, a Wireless relay Node, a Wireless backhaul Node, a Transmission Point (TP), a Transmission and Reception Point (TRP), or the like.
The first network device 20 and the second network device 30 are each capable of allocating transmission resources to the terminal 10 such that the terminal 10 is capable of communicating with the source cell or the target cell based on the transmission resources. The coverage area of each network device can be divided into at least one cell. In this embodiment, the source cell and the target cell may be cells corresponding to the same network device or different network devices. That is, the first network device 20 and the second network device 30 are the same network device or different network devices, which is not particularly limited in the embodiment of the present application.
The terminal 10 is a terminal 10 having a wireless communication function. The terminal 10 may be a mobile phone, a tablet computer, a computer with a wireless communication function, or a wearable device. In the embodiments of the present application, this is not particularly limited.
The Cell switching process may be a Master Cell Group (MCG) switching process, or a Secondary Cell Group (SCG) changing process. In the embodiments of the present application, this is not particularly limited.
Referring to fig. 2, a flowchart of a cell handover method according to an exemplary embodiment of the present application is shown. The method is performed by a first network device, the method comprising the steps of:
step S201: in response to receiving a configuration completion notification of a terminal, sending a first release instruction to the terminal, the first release instruction indicating to release a connection with a source cell;
step S202: and in response to receiving the release completion notification of the terminal for the first release indication, sending a second release indication to a second network device, wherein the second release indication indicates to release the connection between the source cell and the terminal, and the second network device provides a communication service for the source cell.
In some embodiments, the method further comprises:
and releasing the connection of the terminal and the target cell in response to receiving the switching cancellation notice of the second network equipment.
In some embodiments, before the sending the first release indication to the terminal in response to receiving the configuration completion notification of the terminal, the method further comprises:
in response to receiving a handover request of the second network device, generating a handover request response for the handover request, where the handover request is used to request handover to a target cell, and the handover request response includes first configuration information of the target cell;
and sending a switching request response to the second network equipment.
In some embodiments, the method further comprises:
in response to receiving a release completion notification for the first release indication by the terminal, sending a handover success notification to the second network device, where the second network device is configured to feedback sequence code information based on the handover success notification;
in response to receiving the sequence code information of the second network device, storing the sequence code information, the sequence code information representing encoding information of the packet data convergence protocol PDCP.
In some embodiments, after the receiving the release completion notification for the first release indication by the terminal, the method further comprises:
sending a path switching request to a data management platform, wherein the path switching request indicates a service cell used when switching data interaction with a terminal;
and receiving a path switching response sent by the data management platform.
In the embodiment of the application, when the cell switching is successful, the first network device firstly indicates the terminal to release the connection, and after the terminal release is completed, the second network device is indicated to release the connection, so that the configuration information of the terminal can be reserved in the network device corresponding to the source cell before the switching is completed, and therefore if the cell switching fails, the connection between the terminal and the source cell can be recovered, network searching and connection establishment do not need to be carried out again, and network delay is reduced.
Referring to fig. 3, a flowchart of a cell handover method according to an exemplary embodiment of the present application is shown. The method is performed by a second network device, the method comprising the steps of:
step S301: and releasing the connection between the source cell and the terminal in response to receiving a second release instruction of the terminal, wherein the second release instruction is sent after the terminal releases the connection with the source cell based on the first release instruction after receiving the first release instruction sent by the first network equipment, and the first network equipment is used for providing communication service for the target cell.
In some embodiments, the method further comprises:
recovering the data transmission configuration of the terminal from the source cell in response to receiving the switching failure notice of the terminal;
and sending a completion recovery notification to the terminal in response to completion of the data transmission configuration.
In some embodiments, the method further comprises:
and in response to receiving the handover failure notification of the terminal, sending a handover cancel notification to the first network device, the handover cancel notification indicating that the connection of the terminal with the target cell is released.
In some embodiments, the recovering the data transmission configuration of the source cell to the terminal includes:
acquiring second configuration information of the source cell based on the switching failure notification;
and recovering the data transmission configuration of the source cell to the terminal based on the second configuration information.
In some embodiments, before releasing the connection between the source cell and the terminal in response to receiving the second release indication of the terminal, the method further includes:
sending a handover request to the first network device when the target cell meets a cell handover condition, wherein the handover request is used for requesting handover to the target cell;
and receiving a handover request response sent by the first network equipment, wherein the handover request response comprises the first configuration information of the target cell.
In some embodiments, the method further comprises:
and responding to the switching success notice sent by the first network equipment, and feeding back sequence code information based on the switching success notice.
In the embodiment of the application, when the cell switching is successful, the first network device firstly indicates the terminal to release the connection, and after the terminal release is completed, the second network device is indicated to release the connection, so that the configuration information of the terminal can be reserved in the network device corresponding to the source cell before the switching is completed, and therefore if the cell switching fails, the connection between the terminal and the source cell can be recovered, network searching and connection establishment do not need to be carried out again, and network delay is reduced.
Referring to fig. 4, a flowchart of a cell handover method according to an exemplary embodiment of the present application is shown. The method comprises the following steps:
step S401: after the target cell is switched to, sending a configuration completion notification to a first network device, wherein the first network device is used for providing communication service for the target cell;
step S402: responding to a first release instruction sent by the first network equipment, releasing the connection with the source cell, and sending a release completion notification of the first release instruction to the first network equipment, wherein the release completion notification of the first release instruction is used for instructing the first network equipment to send a second release instruction to a second network equipment, and the second release instruction is used for instructing the second network equipment to release the connection between the source cell and the terminal.
In some embodiments, the method further comprises:
under the condition that a first release instruction sent by the first network equipment is not received, sending a switching failure notification to second network equipment, wherein the switching failure notification is used for indicating the second network equipment to recover the data transmission configuration of a source cell to the terminal;
restoring the data transmission configuration with the source cell in response to the completion restoration notification of the second network device.
In the embodiment of the application, when the cell switching is successful, the first network device firstly indicates the terminal to release the connection, and after the terminal release is completed, the second network device is indicated to release the connection, so that the configuration information of the terminal can be reserved in the network device corresponding to the source cell before the switching is completed, and therefore if the cell switching fails, the connection between the terminal and the source cell can be recovered, network searching and connection establishment do not need to be carried out again, and network delay is reduced.
Referring to fig. 5, a flowchart of a cell handover method according to an exemplary embodiment of the present application is shown. In the embodiment of the method, the successful cell handover is taken as an example for explanation, and the method includes the following steps:
step S501: the first network equipment receives a switching request sent by the second network equipment.
The switching request is used for requesting the terminal to be switched from the source cell to the target cell. Referring to fig. 6, fig. 6 shows a timing diagram of a cell handover method according to an exemplary embodiment of the present application. Before this step, the terminal measures the current network environment, reports the measurement result to the second network device, and the second network device performs cell switching judgment based on the measurement result. And if the cell switching is determined to be needed, the second network equipment determines the target cell and sends a switching request to the first network equipment corresponding to the target cell. Accordingly, in this step, the first network device receives the handover request sent by the second network device.
Step S502: the first network device sends a handover request response to the second network device based on the handover request.
Wherein the handover request response includes the first configuration information of the target cell. The first configuration information is used for indicating configuration parameters of the target cell. For example, the first configuration information includes an Identifier of the target Cell, a Cell-Radio Network Temporary Identifier (C-RNTI) of the target Cell, a security algorithm Identifier of a security algorithm selected by the first Network device, and the like.
In this step, the first network device generates a handover request response for the handover request based on the handover request, and transmits the generated handover request response to the second network device.
Step S503: the second network device receives the handover request response, which includes the first configuration information of the target cell.
Step S504: and the second network equipment sends a reconfiguration instruction to the terminal based on the first configuration information in the switching request response.
In this step, the reconfiguration command includes, in addition to the first configuration Information, a Data Radio Bearer (DRB) configured with a dual activation protocol configuration parameter (dapsccfig-r 16), a set of dedicated Random Access Channels (RACH), a Synchronization Signal and a configuration index of PBCH blocks (SSB) associated therewith, and a Channel State Information Reference Signal (CSI-RS) associated therewith.
The reconfiguration command may be a Radio Resource Control (RRC) command, and the like, which is not specifically limited in this embodiment of the present application.
Step S505: the terminal receives the reconfiguration instruction.
Step S506: and the terminal performs data transmission configuration based on the reconfiguration instruction.
In this step, the terminal maintains the connection with the second network device corresponding to the source cell, and performs configuration based on the first configuration information. Referring to fig. 6, the terminal starts a handover timer T304, performs configuration, synchronization, random access, and other processes based on the first configuration information, thereby completing configuration for the target cell, and stops the handover timer T304 after completing the configuration.
In this step, the terminal modifies the data transmission configuration corresponding to the source cell based on the reconfiguration instruction, so that the modified data transmission configuration can be matched with the target cell. The terminal configures a Packet Data Convergence Protocol (PDCP) entity based on the first configuration information, so that the DRB can meet the DAPS requirement, and simultaneously carries Data transmission of the source cell and the target cell during the cell handover process. For the non-DAPS DRB, the terminal configures the terminal based on the DRB parameters in the first configuration information, so that the DRB meets the data transmission requirement of the target cell. The data carried by the non-DAPS DRB includes: PDCP, RLC state variables, security configuration, and data stored in transmission and reception buffers in the PDCP and RLC entities. In this step, the terminal configures the DRB of the data as a DRB corresponding to the target cell based on the first configuration information. In addition, for each Signaling Radio Bearer (SRB), based on the first configuration information, a Radio Link Control (RLC) entity of the SRB is established, and the SRB corresponding to the source cell is idle.
Step S507: and after the terminal is switched to the target cell, sending a configuration completion notification to the first network equipment.
The configuration completion notification is used to indicate that the configuration for the target cell is completed and data transmission is enabled.
Step S508: the first network device receives the configuration completion notification.
Step S509: the first network equipment sends a first release instruction to the terminal.
Wherein the first release indication indicates to release the connection with the source cell.
Step S510: the terminal receives the first release indication.
Step S511: and the terminal releases the connection between the terminal and the source cell based on the first release indication.
In this step, the terminal deletes the relevant configuration of the source cell based on the first release instruction, thereby releasing the connection with the source cell.
Step S512: the terminal sends a release completion notification for the first release indication to the first network device.
Wherein the release completion notification indicates that the terminal has currently released the connection with the source cell.
Step S513: the first network device receives a release completion notification.
Step S514: and the first network equipment sends a second release instruction to the second network equipment, wherein the second release instruction carries the terminal identifier of the terminal.
And the second release instruction indicates that the connection between the terminal corresponding to the terminal identification and the source cell is released.
Step S515: the second network device receives the second release indication.
Step S516: and the second network equipment releases the connection between the terminal corresponding to the terminal identification and the source cell based on the second release indication.
In this step, the second network device determines the terminal to be released based on the terminal identifier, and deletes the configuration information related to the terminal in the source cell.
It should be noted that, before sending the second release instruction to the second network device, the first network device sends a handover completion notification to the second network device. And in response to receiving the sequence code information of the second network equipment, the first network equipment stores the sequence code information. The Sequence code information may be a Packet Data Convergence Protocol (PDCP) Sequence code (SN) used to represent coding information of the PDCP.
In addition, the first network device also sends a path switching request to the data management platform, where the path switching request carries an identifier of the target cell, and the data management platform switches the data transmission path from the source cell to a data path corresponding to the target cell based on the path switching request, where the data transmission path is a transmission path used by the data management platform and the terminal for data transmission, and sends a path switching response to the first network device, where the path switching response indicates that path switching is currently completed, and the first network device receives the path switching response. And the first network equipment determines that the path switching is completed based on the path switching response so as to transmit data between the data management platform and the terminal based on the path. The data Management platform is an Access and Mobility Management Function (AMF) platform or a User Plane Function (UPF) platform, and the like, which is not specifically limited in the embodiments of the present application.
It should be noted that the first network device may first send a switching success notification to the second network device, and then send a path switching request to the data management platform; the first network device can also send a path switching request to the data management platform first and then send a switching success notification to the second network device; the first network device may also send a switching success notification to the second network device and send a path switching request to the data management platform at the same time. In the embodiments of the present application, this is not particularly limited.
In the embodiment of the application, when the cell switching is successful, the first network device firstly indicates the terminal to release the connection, and after the terminal release is completed, the second network device is indicated to release the connection, so that the configuration information of the terminal can be reserved in the network device corresponding to the source cell before the switching is completed, and therefore if the cell switching fails, the connection between the terminal and the source cell can be recovered, network searching and connection establishment do not need to be carried out again, and network delay is reduced.
Referring to fig. 7, a flowchart of a cell handover method according to an exemplary embodiment of the present application is shown. In the embodiment of the method, the cell is not successfully switched as an example for explanation, and the method includes the following steps:
step S701: the first network equipment receives a switching request sent by the second network equipment.
This step is the same as the principle of step S501, and is not described herein again.
Step S702: the first network device sends a handover request response to the second network device based on the handover request.
The principle of this step is the same as that of step S502, and is not described herein again.
Step S703: the second network device receives the handover request response, which includes the first configuration information of the target cell.
Step S704: and the second network equipment sends a reconfiguration instruction to the terminal based on the first configuration information in the switching request response.
The principle of this step is the same as that of step S504, and is not described herein again.
Step S705: the terminal receives the reconfiguration instruction.
Step S706: and the terminal performs data transmission configuration based on the reconfiguration instruction.
The principle of this step is the same as that of step S506, and is not described herein again.
Step S707: and the terminal sends a switching failure notice to the second network equipment under the condition of not receiving the first release instruction sent by the first network equipment.
In this step, the terminal determines that the handover from the source cell to the target cell is not successful, and releases the connection with the target cell.
In some embodiments, the terminal does not complete the data transmission configuration, such that the handover fails, such that the terminal does not send a handover complete notification to the first network device. For example, if the terminal does not complete the data transmission configuration when the on duration of the switching timer T304 reaches the first preset duration, the terminal determines that the switching is failed. The first preset time period is continuously set as required, and is not specifically limited in the embodiment of the present application. For example, the first preset time period is 1 second or 2 seconds, etc.
In some embodiments, the terminal completes data transmission configuration, sends a configuration completion notification to the first network device, and determines that handover fails when a Radio Link Failure (RLF) occurs in the target cell. For example, after the terminal sends the configuration completion notification to the first network device, the notification response of the first network device is not received within a second preset time period, and it is determined that the terminal generates the RLF in the target cell; or, after the terminal is switched to the target cell, sending detection information to the second network device every third preset time, and if no response information of the detection information is received, determining that the RLF occurs in the target cell. The second preset time and the third preset time are set as required, and in the embodiment of the present application, the second preset time and the third preset time are not specifically limited.
In this step, referring to fig. 8, after the terminal determines that the handover fails, the terminal deletes the configuration information of the target cell.
The terminal stores the configuration information of the target cell and the configuration information of the source cell before deleting the configuration information of the target cell. In this step, the terminal determines the configuration information of the target cell from the stored configuration information of the target cell and the configuration information of the source cell, and deletes the configuration information, so that only the configuration information of the source cell is stored in the terminal, and therefore, a handover failure notification is sent to the second network device based on the configuration information of the source cell, network searching and connection establishment according to an existing protocol are avoided, and efficiency is improved.
Referring to fig. 8, the handover failure notification indicates that the terminal is not successfully handed over from the source cell to the target cell currently. In this step, the terminal sends a handover failure notification to the second network device based on the originally stored configuration information of the source cell. The handover failure notification includes failure information of the current handover failure, for example, connection timeout.
Before the terminal sends the handover notification to the second network device, it needs to recover the data transmission configuration with the source cell. Correspondingly, before the step, the terminal modifies the data transmission configuration corresponding to the target cell, so that the modified data transmission configuration can be matched with the source cell. And the terminal recovers the PDCP entity based on the second configuration information, thereby releasing the DRB which corresponds to the target cell and meets the DAPS requirement. For the non-DAPS DRB, the terminal configures the terminal based on the DRB parameters in the second configuration information, so that the DRB recovers the data transmission requirement of the source cell. In this step, the terminal configures the DRB as a DRB corresponding to the source cell based on the second configuration information, and recovers the data transmission configuration corresponding to the source cell. In addition, for each SRB, based on the second configuration information, the RLC entity of the SRB is rebuilt, and the SRB which is idle before is recovered to be used.
Step S708: the second network device receives the handover failure notification.
Step S709: the second network device recovers the data transmission configuration for the source cell based on the handover failure notification.
In this step, the second network device obtains second configuration information of a source cell corresponding to the terminal based on the handover failure notification; and recovering the data transmission configuration of the source cell based on the second configuration information. Wherein the second network device restoring the data transmission configuration to the source cell comprises: and restoring the corresponding parameter settings of PDCP, DRB, SRB and the like corresponding to the source cell.
In the embodiment of the present application, since the configuration information of the source cell corresponding to the terminal is still stored in the second network device, after the terminal sends the handover failure notification to the second network device, the second network device can recover the data transmission configuration corresponding to the source cell, so that a reconnection establishing process is not required, and further, when the cell handover fails, the communication delay of the terminal is reduced.
Step S710: the second network device sends a completion recovery notification to the terminal.
And the second network equipment sends a recovery completion notification to the terminal based on the data transmission configuration with the original terminal.
Step S711: and the terminal receives the completion recovery notification sent by the second network equipment.
In this step, the terminal performs configured data transmission configuration based on the first configuration information, and updates the data transmission configuration corresponding to the recovered source cell. The updating process is the same as the principle of restoring the data transmission configuration in step S708, and is not described herein again.
Step S712: the second network device sends a handover cancel notification to the first network device, the handover cancel notification including the terminal identification of the terminal.
The handover cancel notification is used to notify the first network device to no longer perform cell handover.
Step S713: the first network equipment receives the switching cancellation notification sent by the second network equipment.
Step S714: and the first network equipment releases the connection between the terminal corresponding to the terminal identification and the target cell based on the switching cancellation notice.
In this step, the first network device determines, based on the terminal identifier in the handover cancel notification, a target cell to be connected to be released, and deletes the radio resource and the related configuration of the terminal corresponding to the target cell.
It should be noted that, after the second network device recovers the connection with the terminal, the terminal may further continue to perform measurement, and correspondingly, the second network device may further continue to determine whether to perform cell handover based on the measurement result, and if cell handover is still required, the second network device determines the cell to be handed over from the cells other than the target cell. Therefore, the cell switching failure is prevented, and the success rate of the cell switching is improved.
In the embodiment of the application, when the cell switching is successful, the first network device firstly indicates the terminal to release the connection, and after the terminal release is completed, the second network device is indicated to release the connection, so that the configuration information of the terminal can be reserved in the network device corresponding to the source cell before the switching is completed, and therefore if the cell switching fails, the connection between the terminal and the source cell can be recovered, network searching and connection establishment do not need to be carried out again, and network delay is reduced.
Referring to fig. 9, a block diagram of a cell switching apparatus according to an embodiment of the present application is shown. The cell switching means may be implemented as all or part of the processor, in software, hardware or a combination of both. The device includes:
a first sending module 901, configured to send a first release instruction to a terminal in response to receiving a configuration completion notification of the terminal, where the first release instruction instructs to release a connection with a source cell;
a second sending module 902, configured to send, in response to receiving the release completion notification for the first release indication by the terminal, a second release indication to a second network device, where the second release indication indicates to release the connection between the source cell and the terminal, and the second network device provides a communication service for the source cell.
In some embodiments, the apparatus further comprises:
a first releasing module, configured to release the connection between the terminal and the target cell in response to receiving the handover cancel notification of the second network device.
In some embodiments, the apparatus further comprises:
a generating module, configured to generate, in response to receiving a handover request of the second network device, a handover request response for the handover request, where the handover request is used to request handover to a target cell, and the handover request response includes first configuration information of the target cell;
a fourth sending module, configured to send a handover request response to the second network device.
In some embodiments, the apparatus further comprises:
a fifth sending module, configured to send a handover success notification to the second network device in response to receiving a release completion notification for the first release indication by the terminal, where the second network device is configured to send feedback sequence code information based on the handover success notification;
and the synchronization module is used for responding to the received sequence code information of the second network equipment and storing the sequence code information, wherein the sequence code information represents the coding information of the packet data convergence protocol PDCP.
In some embodiments, the apparatus further comprises:
a sixth sending module, configured to send a path switching request to the data management platform, where the path switching request indicates a serving cell used when switching data interaction with a terminal;
a first receiving module, configured to receive a path switching response sent by the data management platform.
In the embodiment of the application, when the cell switching is successful, the first network device firstly indicates the terminal to release the connection, and after the terminal release is completed, the second network device is indicated to release the connection, so that the configuration information of the terminal can be reserved in the network device corresponding to the source cell before the switching is completed, and therefore if the cell switching fails, the connection between the terminal and the source cell can be recovered, network searching and connection establishment do not need to be carried out again, and network delay is reduced.
Referring to fig. 10, a block diagram of a cell switching apparatus according to an embodiment of the present application is shown. The cell switching means may be implemented as all or part of the processor, in software, hardware or a combination of both. The device includes:
a first releasing module 1001, configured to release, in response to receiving a second release instruction of the terminal, a connection between the source cell and the terminal, where the second release instruction is sent after the terminal receives a first release instruction sent by a first network device, and the first network device is used to provide a communication service for a target cell after releasing the connection with the source cell based on the first release instruction.
In some embodiments, the apparatus further comprises:
a first recovery module, configured to recover, in response to receiving a handover failure notification of a terminal, a data transmission configuration of the source cell to the terminal;
and a seventh sending module, configured to send a completion recovery notification to the terminal in response to completion of the data transmission configuration.
In some embodiments, the apparatus further comprises:
an eighth sending module, configured to send, in response to receiving the handover failure notification of the terminal, a handover cancel notification to the first network device, where the handover cancel notification indicates to release the connection between the terminal and the target cell.
In some embodiments, the first recovery module comprises:
an obtaining unit, configured to obtain second configuration information of the source cell based on the handover failure notification;
and a recovery unit, configured to recover, based on the second configuration information, the data transmission configuration of the source cell to the terminal.
In some embodiments, the apparatus further comprises:
a ninth sending module, configured to send a handover request to the first network device when the target cell meets a cell handover condition, where the handover request is used to request handover to the target cell;
a second receiving module, configured to receive a handover request response sent by the first network device, where the handover request response includes the first configuration information of the target cell;
a tenth sending module, configured to send a reconfiguration instruction to the terminal based on the first configuration information in the handover request response.
In some embodiments, the apparatus further comprises:
and the feedback module is used for responding to the switching success notification sent by the first network equipment and feeding back the sequence code information based on the switching success notification.
In the embodiment of the application, when the cell switching is successful, the first network device firstly indicates the terminal to release the connection, and after the terminal release is completed, the second network device is indicated to release the connection, so that the configuration information of the terminal can be reserved in the network device corresponding to the source cell before the switching is completed, and therefore if the cell switching fails, the connection between the terminal and the source cell can be recovered, network searching and connection establishment do not need to be carried out again, and network delay is reduced.
Referring to fig. 11, a block diagram of a cell switching apparatus according to an embodiment of the present application is shown. The cell switching means may be implemented as all or part of the processor, in software, hardware or a combination of both. The device includes:
a third sending module 1101, configured to send a configuration completion notification to a first network device after the handover to the target cell, where the first network device is configured to provide a communication service for the target cell;
a second releasing module 1102, configured to release, in response to a first release indication sent by the first network device, the connection with the source cell, and send a release completion notification of the first release indication to the first network device, where the release completion notification of the first release indication is used to instruct the first network device to send a second release indication to a second network device, and the second release indication is used to instruct the second network device to release the connection between the source cell and the terminal.
In some embodiments, the apparatus further comprises:
an eleventh sending module, configured to send a handover failure notification to the second network device when the first release instruction sent by the first network device is not received, where the handover failure notification is used to instruct the second network device to recover data transmission configuration of the source cell to the terminal;
a second recovery module, configured to recover the data transmission configuration with the source cell in response to the completion recovery notification of the second network device.
In the embodiment of the application, when the cell switching is successful, the first network device firstly indicates the terminal to release the connection, and after the terminal release is completed, the second network device is indicated to release the connection, so that the configuration information of the terminal can be reserved in the network device corresponding to the source cell before the switching is completed, and therefore if the cell switching fails, the connection between the terminal and the source cell can be recovered, network searching and connection establishment do not need to be carried out again, and network delay is reduced.
Referring to fig. 12, a block diagram of a terminal 1200 according to an exemplary embodiment of the present application is shown. The terminal 1200 may be a terminal having an image processing function, such as a smartphone or a tablet computer. The terminal 1200 in the present application may include one or more of the following components: a processor 1210, a memory 1220, and a communication module 1230.
Processor 1210 may include one or more processing cores. Processor 1210 is coupled to various components throughout terminal 1200 using various interfaces and lines to perform various functions and process data for terminal 1000 by executing or performing instructions, programs, code sets, or instruction sets stored in memory 1220, and invoking data stored in memory 1220. Alternatively, the processor 1210 may be implemented in hardware using at least one of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), and Programmable Logic Array (PLA). The processor 1210 may integrate one or more of a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), a Neural-Network Processing Unit (NPU), a modem, and the like. Wherein, the CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for rendering and drawing the content required to be displayed by the display screen; the NPU is used for realizing an Artificial Intelligence (AI) function; the modem is used to handle wireless communications. It is understood that the modem may not be integrated into the processor 1210, but may be implemented by a single chip.
The Memory 1220 may include a Random Access Memory (RAM) or a Read-Only Memory (ROM). Optionally, the memory 1220 includes a non-transitory computer-readable medium. The memory 1220 may be used to store instructions, programs, code, sets of codes, or sets of instructions. The memory 1220 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing various method embodiments described below, and the like; the storage data area may store data (such as audio data, a phonebook) created according to the use of the terminal 1200, and the like.
The communication module 1230 is configured to transmit and receive radio frequency signals, and may be a Wireless Fidelity (WIFI) module or the like.
The terminal 1210 may further include a display screen, which is a display component for displaying a user interface. Optionally, the display screen is a display screen with a touch function, and through the touch function, a user may use any suitable object such as a finger or a touch pen to perform a touch operation on the display screen.
The display screen is generally provided on the front panel of the terminal 1200. The display screen may be designed as a full-face screen, curved screen, odd-shaped screen, double-face screen, or folding screen. The display screen may also be designed as a combination of a full screen and a curved screen, a combination of a special screen and a curved screen, and the like, which is not limited in this embodiment.
In addition, those skilled in the art will appreciate that the configuration of terminal 1200 illustrated in the above-described figures is not meant to be limiting with respect to terminal 1200, and that terminal 1200 may include more or less components than those illustrated, or some components may be combined, or a different arrangement of components. For example, the terminal 1200 further includes a microphone, a speaker, a radio frequency circuit, an input unit, a sensor, an audio circuit, a power supply, a bluetooth module, and other components, which are not described herein again.
Referring to fig. 13, a block diagram of a network device 1300 according to an exemplary embodiment of the present application is shown. The network device 1300 may be a first network device or a second network device. The network device 1300 may have a relatively large difference due to different configurations or performances, and may include one or more processors (CPUs) 1310 and one or more memories 1320, where the memory 1320 stores at least one instruction, and the at least one instruction is loaded and executed by the processors 1310 to implement the cell switching method provided by the above-mentioned method embodiments. Certainly, the network device 1300 may further include components such as a wired or wireless network interface, a keyboard, and an input/output interface, so as to perform input and output, and the network device 1300 may further include other components for implementing device functions, which are not described herein again.
The embodiment of the present application further provides a computer-readable medium, where at least one instruction is stored, and the at least one instruction is loaded and executed by the processor to implement the cell handover method as shown in the above embodiments.
The embodiment of the present application further provides a computer program product, where at least one instruction is stored, and the at least one instruction is loaded and executed by the processor to implement the cell handover method as shown in the above embodiments.
Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (25)
1. A cell handover method performed by a first network device providing communication services for a target cell, the method comprising:
in response to receiving a configuration completion notification of a terminal, sending a first release instruction to the terminal, wherein the first release instruction indicates to release connection with a source cell;
and in response to receiving a release completion notification of the terminal for the first release indication, sending a second release indication to a second network device, wherein the second release indication indicates that the connection between the source cell and the terminal is released, and the second network device provides a communication service for the source cell.
2. The method of claim 1, further comprising:
and releasing the connection between the terminal and the target cell in response to receiving the switching cancellation notice of the second network equipment.
3. The method of claim 1, wherein prior to sending the first release indication to the terminal in response to receiving the configuration completion notification for the terminal, the method further comprises:
in response to receiving a handover request of the second network device, generating a handover request response for the handover request, wherein the handover request is used for requesting handover to a target cell, and the handover request response comprises first configuration information of the target cell;
and sending a switching request response to the second network equipment.
4. The method of claim 1, further comprising:
in response to receiving a release completion notification for the first release indication by the terminal, sending a handover success notification to the second network device, where the second network device is configured to feedback sequence code information based on the handover success notification;
in response to receiving sequence code information of the second network device, storing the sequence code information, the sequence code information representing encoding information of a packet data convergence protocol, PDCP.
5. The method of claim 1, wherein after receiving a release completion notification for the first release indication from the terminal, the method further comprises:
sending a path switching request to a data management platform, wherein the path switching request indicates a service cell used when switching data interaction with a terminal;
and receiving a path switching response sent by the data management platform.
6. A cell handover method performed by a second network device providing communication service for a source cell, the method comprising:
and in response to receiving a second release instruction of the terminal, releasing the connection between the source cell and the terminal, wherein the second release instruction is sent after the terminal releases the connection with the source cell based on the first release instruction after receiving the first release instruction sent by the first network equipment, and the first network equipment is used for providing communication service for the target cell.
7. The method of claim 6, further comprising:
recovering the data transmission configuration of the terminal from the source cell in response to receiving the switching failure notice of the terminal;
and responding to the completion of the data transmission configuration, and sending a completion recovery notification to the terminal.
8. The method of claim 6, further comprising:
and responding to the received switching failure notice of the terminal, and sending a switching cancellation notice to the first network equipment, wherein the switching cancellation notice indicates that the terminal is released from being connected with the target cell.
9. The method of claim 7, wherein the recovering the data transmission configuration of the terminal from the source cell comprises:
acquiring second configuration information of the source cell based on the switching failure notification;
and recovering the data transmission configuration of the source cell to the terminal based on the second configuration information.
10. The method of claim 6, wherein before releasing the connection of the source cell and the terminal in response to receiving the second release indication for the terminal, the method further comprises:
sending a handover request to the first network device when a target cell meets a cell handover condition, wherein the handover request is used for requesting handover to the target cell;
receiving a handover request response sent by the first network device, wherein the handover request response comprises first configuration information of the target cell;
and sending a reconfiguration instruction to the terminal based on the first configuration information in the switching request response.
11. The method of claim 6, further comprising:
and responding to a switching success notice sent by the first network equipment, and feeding back sequence code information based on the switching success notice.
12. A cell handover method, wherein the method is performed by a terminal, and wherein the method comprises:
after the target cell is switched to, sending a configuration completion notification to a first network device, wherein the first network device is used for providing communication service for the target cell;
responding to a first release indication sent by the first network equipment, releasing the connection with the source cell, and sending a release completion notification for the first release indication to the first network equipment, wherein the release completion notification for the first release indication is used for indicating the first network equipment to send a second release indication to the second network equipment, and the second release indication is used for indicating the second network equipment to release the connection between the source cell and the terminal.
13. The method of claim 12, further comprising:
under the condition that a first release instruction sent by the first network equipment is not received, sending a switching failure notification to second network equipment, wherein the switching failure notification is used for indicating the second network equipment to recover the data transmission configuration of a source cell to the terminal;
restoring the data transmission configuration with the source cell in response to the completion restoration notification of the second network device.
14. An apparatus for cell switching, the apparatus being implemented by a first network device providing communication services for a target cell, the apparatus comprising:
a first sending module, configured to send a first release instruction to a terminal in response to receiving a configuration completion notification of the terminal, where the first release instruction instructs to release a connection with a source cell;
a second sending module, configured to send a second release indication to a second network device in response to receiving a release completion notification for the first release indication by the terminal, where the second release indication indicates to release the connection between the source cell and the terminal, and the second network device provides a communication service for the source cell.
15. An apparatus for cell switching, the apparatus being implemented by a second network device, the second network device providing communication services for a source cell, the apparatus comprising:
a first release module, configured to release, in response to receiving a second release instruction of a terminal, a connection between a source cell and the terminal, where the second release instruction is sent after the terminal receives a first release instruction sent by a first network device, and based on the first release instruction, the terminal releases the connection with the source cell, and the first network device is configured to provide a communication service for a target cell.
16. A cell handover apparatus, the apparatus being performed by a terminal, the apparatus comprising:
a third sending module, configured to send a configuration completion notification to a first network device after switching to a target cell, where the first network device is configured to provide a communication service for the target cell;
a second release module, configured to release, in response to a first release indication sent by the first network device, a connection with a source cell, and send a release completion notification of the first release indication to the first network device, where the release completion notification of the first release indication is used to indicate the first network device to send a second release indication to a second network device, and the second release indication is used to indicate the second network device to release the connection between the source cell and the terminal.
17. A first network device, wherein the first network device comprises a processor and a memory; the memory stores at least one program code for execution by the processor to implement the cell handover method of any of claims 1 to 5.
18. A second network device, wherein the second network device comprises a processor and a memory; the memory stores at least one program code for execution by the processor to implement the cell handover method of any of claims 6 to 11.
19. A terminal, characterized in that the terminal comprises a processor and a memory; the memory stores at least one program code for execution by the processor to implement the cell handover method of any of claims 12 to 13.
20. A computer-readable storage medium, characterized in that the computer-readable storage medium stores at least one program code for execution by a processor to implement the cell handover method of any of claims 1 to 5.
21. A computer-readable storage medium, characterized in that the computer-readable storage medium stores at least one program code for execution by a processor to implement the cell handover method according to any one of claims 6 to 11.
22. A computer-readable storage medium, characterized in that the computer-readable storage medium stores at least one program code for execution by a processor to implement the cell handover method according to any one of claims 12 to 13.
23. A computer program product, characterized in that it stores at least one program code which is loaded and executed by a processor to implement the cell handover method according to any of claims 1 to 5.
24. A computer program product, characterized in that it stores at least one program code which is loaded and executed by a processor to implement the cell handover method according to any of claims 6 to 11.
25. A computer program product, characterized in that it stores at least one program code which is loaded and executed by a processor to implement the cell handover method according to any of claims 12 to 13.
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| PCT/CN2022/135892 WO2023124749A1 (en) | 2021-12-31 | 2022-12-01 | Cell handover method and apparatus, and network device and storage medium |
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| CN202111660335.2A CN114339914A (en) | 2021-12-31 | 2021-12-31 | Cell switching method, device, network equipment and storage medium |
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| WO2024092654A1 (en) * | 2022-11-03 | 2024-05-10 | Nec Corporation | Method, device and computer storage medium of communication |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023124749A1 (en) * | 2021-12-31 | 2023-07-06 | 哲库科技(北京)有限公司 | Cell handover method and apparatus, and network device and storage medium |
| WO2024092654A1 (en) * | 2022-11-03 | 2024-05-10 | Nec Corporation | Method, device and computer storage medium of communication |
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| Publication number | Publication date |
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| WO2023124749A1 (en) | 2023-07-06 |
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