WO2018059299A1 - Method, device and system for cell handover, and computer storage medium - Google Patents

Abstract

Provided in the present invention are a method, device and system for cell handover, wherein the method comprises: instructing a user equipment (UE) to carry out cell handover or secondary cell group change; and instructing the UE to keep a connection with a source cell, and instructing the UE to detect a wireless link of the source cell. An embodiment of the present invention provides a computer storage medium.

Description

Method, device and system for cell switching and computer storage medium

The present application is filed on the basis of the Chinese Patent Application No. No. No. No. No. No. No. No. No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No

Technical field

The present invention relates to the field of communications, and in particular, to a method, device and system for cell handover and a computer storage medium.

Background technique

In the related art, a dual connectivity (DC) function is introduced in a Long Term Evolution (LTE) system, and the DC includes two cell groups: an MCG (Master Cell Group) and an SCG ( Secondary Cell Group, secondary cell group). The MCG includes one primary cell (PCell) or additionally includes one or more secondary cells (SCells), and the SCG includes one primary secondary cell (PSCell) or additionally includes one or more SCells. The base station that manages the MCG is called a master base station (MeNB), and the base station that manages the SCG is called a secondary base station (Secondary eNB, SeNB).

The mobility procedure of the related art UE includes a handover method for maintaining a connection between a source and a target cell, and the LTE system in the related art adopts a handover method in which a source cell is disconnected first, and then a connection is established in the target cell (ie, Break-before-make, first created after the interrupt). The transmission and reception of business data will be interrupted. Therefore, the 3GPP discussion group provides a new scheme for simultaneously maintaining the UE's connection between the source cell and the target cell (ie, make-before-break, first establishment and then interrupt) for reducing the UE side handover interruption delay. That is, the UE remains connected to the source base station after receiving the handover command, and disconnects from the source base station before or after accessing the target base station. further more, The network side may not trigger the random access procedure of the UE in the handover process, and configure the uplink transmission resource (such as a physical uplink shared channel (PUSCH) resource) of the target cell to the UE in the handover command, so that the UE may Sending resources directly on the uplink directly performs uplink data transmission in the target cell. FIG. 1 is a schematic diagram of a handover in a related art according to the present invention. A random response (RAR) message (standard definition) carries a Cell Radio Network Temporary Identifier (C-RNTI).

As shown in FIG. 1, the cell handover of the UE may include:

The UE reports the measurement report;

The source base station sends a handover request to the target base station according to the measurement report;

The target base station receives the handover request of the source base station, and sends a handover request acknowledgement to the source base station;

After receiving the handover request acknowledgement, the source base station sends a radio resource control (RRC) connection reconfiguration message to the UE;

After receiving the RRC connection reconfiguration message, the UE maintains a connection with the source cell;

The UE initiates a random access request (PRACH) to the target base station;

Receiving, by the UE, a random access response returned by the target base station;

Sending, by the UE, an RRC connection configuration complete message to the target base station;

The source base station releases the UE context.

In the make-before-break scheme, it is not determined that the UE stops the detection of the physical layer radio link after receiving the handover command, and the data layer cannot be sent or received even if the physical layer has an error while maintaining the connection of the source base station. The data recovery process cannot be triggered in time, resulting in more data transmission interruption. The UE needs to detect and receive the downlink control channel before sending the uplink data to the target cell. Since the UE cannot simultaneously support data transmission and reception in the source and the target cell, the UE may be disconnected from the source base station in advance, causing more data transmission interruption. . In view of the above problems in the related art, no effective solution has been found yet.

Summary of the invention

The embodiments of the present invention provide a method, a device, and a system for cell handover, which at least solve the technology in the related art that the data recovery process cannot be triggered in time when the physical layer fails to send and receive data during the cell handover process. problem.

According to an embodiment of the present invention, a method for cell handover is provided, including: instructing a user equipment UE to perform cell handover or a supplementary cell group change; instructing the UE to maintain a connection with a source cell, and instructing the UE to The source cell performs detection of a wireless link.

According to an embodiment of the present invention, a method for another cell handover is provided, that is: the user equipment UE receives indication information for indicating a cell handover or a supplementary cell group change; the UE is performing a cell handover or a supplementary cell group. When changing, the connection with the source cell is maintained, and the UE performs radio link detection on the source cell.

According to another embodiment of the present invention, a device for cell handover is provided, which is applied to a source base station or a primary base station, and includes:

a first indication module, configured to instruct the user equipment UE to perform cell handover or a supplementary cell group change; the second indication module is configured to instruct the UE to maintain a connection with the source cell, and instruct the UE to perform a radio link to the source cell Detection.

According to still another embodiment of the present invention, a cell switching system is further provided, including a network side device and a user equipment UE, where the network side device includes any device that is applied to the network side device, and the UE includes the foregoing application. Any device at the UE.

According to yet another embodiment of the present invention, a computer storage medium is also provided. The computer storage medium stores computer executable instructions for performing the cell switching method provided by any one of the above technical solutions.

Through the invention, during the mobility process of the UE, while maintaining the connection with the source cell, the wireless link detection can be initiated, and the wireless link reply can be quickly performed when the wireless link problem occurs. Solved the problem that the physical layer fails during the cell handover process in the related art. The technical problem that the data recovery process cannot be triggered in time when the data is sent or received is interrupted.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a schematic diagram of switching in the related art of the present invention;

2 is a flowchart of a method for cell handover according to an embodiment of the present invention;

FIG. 3 is a flowchart of another method for cell handover according to an embodiment of the present invention; FIG.

4 is a structural block diagram of an apparatus for cell handover according to an embodiment of the present invention;

FIG. 5 is a structural block diagram of another apparatus for cell handover according to an embodiment of the present invention; FIG.

6 is a structural block diagram of a system for cell handover according to an embodiment of the present invention;

7 is a schematic diagram of handover when a cell is switched according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of handover when the SeNB is changed according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

Example 1

A method for cell handover is provided in this embodiment. FIG. 2 is a flowchart of a method for cell handover according to an embodiment of the present invention. As shown in FIG. 2, the process includes the following steps:

Step S202, instructing the user equipment UE to perform cell handover or auxiliary cell group change;

Step S204, instructing the UE to maintain the connection with the source cell, and instructing the UE to perform detection of the radio link on the source cell that is handed over. Here, the source cell of the handover, that is, the aforementioned source cell.

Through the above steps, during the mobility process of the UE, while maintaining the connection with the source cell, the wireless link detection can be initiated, and the wireless link reply can be quickly performed when the wireless link problem occurs. The technical problem that the data transmission interruption cannot be triggered in time when the physical layer fails to send and receive data during the cell handover process in the related art is solved.

Optionally, the execution body of the foregoing steps may be a network side, such as a core network device, an access network device, such as a base station, a source base station, a primary base station, and the like, but is not limited thereto.

Optionally, after the user equipment UE is instructed to perform the cell handover or the auxiliary cell group change, the method further includes: indicating time information that the UE listens to and receives the downlink control channel in the target cell; and/or indicates that the UE is in the target cell monitoring and receiving downlink. Time information of the data channel. The time for data interruption is reduced by controlling the point in time at which the UE receives the target cell control or data channel.

This embodiment includes two optional application scenarios, cell handover and auxiliary cell group change. The UE's mobility may cause the UE to switch between different cells, and the auxiliary cell group change may also trigger the UE to switch between different cells. in

In some embodiments, the method can include:

S11. Send a handover request message to the target cell, where the handover request message includes indication information used to indicate that the UE remains connected to the source cell when switching.

S12. Receive a handover response message that is sent by the target cell according to the handover request message, where the handover response message carries radio resource control RRC configuration information and the indication information that the UE performs handover.

The step S202 may include:

S13. Send the handover response message to the UE. At this time, the handover response message may carry information indicating that the UE performs cell handover.

In another scenario, the method further includes:

S21: Send an add request message to the target secondary cell, where the add request message carries indication information used to indicate that the UE keeps a connection with the source secondary cell when performing the auxiliary cell group change;

S22. Receive an add request response message that is sent by the target secondary cell according to the add request message, where the request response message carries radio resource control RRC configuration information that is used by the UE to perform a supplementary cell group change, where the RRC configuration information is used. Carrying the indication information;

The step S202 may include:

S23. Send the add request response message to the UE. Information indicating the secondary cell replacement of the UE may be carried in the add request response message.

Another method for cell handover is provided in this embodiment. FIG. 3 is a flowchart of another method for cell handover according to an embodiment of the present invention. As shown in FIG. 3, the process may include the following steps:

Step S302: The user equipment UE receives indication information for indicating a cell handover or a secondary cell group change.

Step S304: When performing cell handover or auxiliary cell group change, the UE maintains a connection with the source cell and performs radio link detection on the source cell.

Optionally, the condition that the UE determines to perform the detection of the wireless link includes at least one of the following:

Receiving an indication that the network side indicates that the source cell remains connected;

The timer that initiates the switch failure detection fails.

The timer for starting the detection of the failure of the secondary cell group failure fails;

Failure to reset or rebuild the MAC entity of the UE;

Failure to reset or re-establish the RLC entity of the UE;

Failure to reset or rebuild the UE's PDCP entity;

Sending uplink data in the target cell;

Failed to send control information in the target cell;

Receiving downlink data in the target cell;

Failed to receive control information in the target cell.

The startup failure in this implementation may be that the UE does not start the timer after completing the access, or the startup is not successful, and other actions, such as reset, re-establish, and send, are similar.

Optionally, the detecting, by the UE, the radio link of the source cell includes at least one of the following actions: starting a radio link problem detection timer when a radio link problem occurs; when a radio link problem occurs , a counter that initiates wireless link problem detection; when the wireless link is restored, a counter for wireless link recovery is initiated.

Optionally, after the detecting the radio link of the source cell, the method further includes: detecting, by the UE, a channel of the target cell, where the channel of the target cell includes at least one of a downlink control channel and a data channel.

Optionally, the triggering condition that the UE detects and receives the channel of the target cell includes at least one of the following:

When the UE completes downlink synchronization with the target cell;

The kth subframe after the UE completes downlink synchronization with the target cell;

When the UE sends uplink data in the target cell;

The kth subframe before the UE sends the uplink data in the target cell;

When the UE sends uplink control information in the target cell;

The kth subframe before the UE sends the uplink data in the target cell;

Where k is a positive integer. Specifically, k is the value agreed by the protocol or the value of the network configuration.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, CD-ROM, including a number of instructions to make a terminal device (can It is a mobile phone, a computer, a server, or a network device, etc.) that performs the methods described in various embodiments of the present invention.

Example 2

In the embodiment, a device and a system for the cell handover are also provided. The device is used to implement the foregoing embodiments and the preferred embodiments, and details are not described herein. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 4 is a structural block diagram of an apparatus for cell handover according to an embodiment of the present invention. As shown in FIG. 4, the method may be applied to a source base station or a primary base station, a source secondary base station, or a source macro base station on a network side, including:

The first indication module 40 is configured to instruct the user equipment UE to perform cell handover or auxiliary cell group change;

The second indication module 42 is configured to instruct the UE to maintain the connection with the source cell, and instruct the UE to perform detection of the radio link of the source cell.

Optionally, the device further includes at least one of the third indication module and the fourth indication module:

The third indication module is configured to: after the first indication module instructs the user equipment UE to perform a cell handover or a secondary cell group change, instructing the UE to monitor and receive time information of the downlink control channel in the target cell;

The fourth indication module is configured to instruct the UE to monitor and receive time information of the downlink data channel in the target cell after the first indication module indicates that the user equipment UE performs the cell handover or the auxiliary cell group change.

FIG. 5 is a structural block diagram of another apparatus for cell handover according to an embodiment of the present invention. As shown in FIG. 5, the apparatus may be applied to a user equipment UE, but is not limited to a UE handover apparatus. Can include:

The receiving module 50 is configured to receive, to indicate, performing cell handover or auxiliary cell group change. Indication information;

The processing module 52 is configured to maintain a connection with the source cell and perform a radio link detection on the source cell when performing cell handover or auxiliary cell group change.

Optionally, the processing module determines that the condition for performing the detection of the wireless link includes at least one of the following:

Receiving an indication that the network side indicates that the source cell remains connected;

The timer that initiates the switch failure detection fails.

The timer for starting the detection of the failure of the secondary cell group failure fails;

Failure to reset or rebuild the MAC entity of the UE;

Failure to reset or re-establish the RLC entity of the UE;

Failure to reset or rebuild the UE's PDCP entity;

Failure to send uplink data and/or control information in the target cell;

Failure to receive downlink data and/or control information in the target cell.

Optionally, the device further includes: a detecting module, configured to detect, after the processing module performs the radio link detection on the source cell, the downlink control channel and/or the data channel of the receiving target cell.

Optionally, the detecting condition that the detecting module detects the downlink control channel and/or the data channel of the receiving target cell includes at least one of the following:

When the UE completes downlink synchronization with the target cell;

The kth subframe after the UE completes downlink synchronization with the target cell;

When the UE sends uplink data in the target cell;

The kth subframe before the UE sends the uplink data in the target cell;

When the UE sends uplink control information in the target cell;

The kth subframe before the UE sends the uplink data in the target cell;

Where k is a positive integer.

FIG. 6 is a structural block diagram of a system for cell handover according to an embodiment of the present invention. As shown in FIG. 6, the network side device 60 and the user equipment UE 62 are included.

The network side device includes: a first indication module 602, configured to instruct the user equipment UE to perform cell handover or a supplementary cell group change; the second indication module 604 is configured to instruct the UE to maintain the connection with the source cell, and instruct the UE to perform the source cell The detection of the wireless link; the network side device may be a base station, specifically including a source cell and a target cell;

The UE 62 includes: a receiving module 622, configured to receive indication information for indicating cell handover or a supplementary cell group change; and a processing module 624 configured to maintain a connection with the source cell when performing cell handover or auxiliary cell group change, And detecting the wireless link of the source cell.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination. The forms are located in different processors.

Example 3

This embodiment is an optional embodiment according to the present invention, which is used to describe the present application in detail in conjunction with a specific scenario:

The embodiment provides a process for changing a serving base station (cell) to a UE in an LTE system, including single connection switching; dual connection switching; adding and changing a secondary base station under dual connectivity, and the UE still needs to maintain the source base station for a period of time. The connection indicates the processing behavior of a specific UE through the network, thereby reducing the service interruption delay and packet loss of the UE.

The technical problem to be solved in this embodiment is that in the make-before-break scheme in the related art, since it is not determined that the UE stops the detection of the physical layer radio link after receiving the handover command, the connection of the source base station is maintained. In the process, even if the physical layer fails to send and receive data, the data recovery process cannot be triggered in time, resulting in more data transmission interruption. The UE needs to detect and receive the downlink control channel before sending the uplink data to the target cell. Since the UE cannot simultaneously support data transmission and reception in the source and the target cell, the UE may be disconnected from the source base station in advance, causing more data transmission interruption. .

This embodiment specifically includes the following two examples:

Example 1: Cell handover, source base station cell (Source eNB) to target base station cell (TargeteNB)

FIG. 7 is a schematic diagram of handover when a cell is switched according to an embodiment of the present invention, including:

Step 1: The source base station sends a handover request message to the target base station, including indication information that is kept connected to the source base station. (as indicated by the remainingConnection in the Handover Request message in step 1)

Step 2: After receiving the handover request, the target base station carries the RRC message for the UE handover in the handover response message, and carries the indication information that the source base station remains connected in the RRC message. (as indicated by the remainingConnection in the Handover Request Acknowledge message in step 2)

Step 3: After receiving the handover command, the UE maintains a connection with the source base station. (as indicated by the remainingConnection in the RRCConnectionReconfiguration message in step 3)

Step 3.1: The UE determines to perform radio link detection according to the following conditions:

Receiving an indication that the network side indicates that the source base station remains connected;

There is no timer that starts the switch failure detection (such as T304);

The MAC entity of the UE is not reset or re-established;

The RLC entity of the UE is not reset or re-established;

The PDCP entity of the UE is not reset or re-established;

No uplink data and/or control information is sent in the target cell;

Not receiving downlink data and/or control information in the target cell;

The UE performs the detection of the wireless link as performing at least one of the following behaviors:

A timer that initiates wireless link problem detection (such as T310) when a wireless link problem occurs;

Initiating a radio link problem detection counter (such as N310) when a wireless link problem occurs;

When recovering the wireless link, start a counter for wireless link recovery (such as N311);

Step 3.2: The triggering condition for the UE to start detecting the downlink control channel and/or the data channel of the receiving target cell includes:

The UE completes downlink synchronization with the target cell;

The UE completes the kth subframe after downlink synchronization with the target cell (if the protocol agrees k=4);

Before the UE sends uplink data in the target cell;

The kth subframe before the UE is to send uplink data in the target cell (if the protocol stipulates that k=4);

Before the UE sends the uplink control information in the target cell;

The kth subframe before the UE is to send uplink data in the target cell (if the protocol stipulates that k=4);

Step 4: The UE disconnects from the source base station, and receives downlink data and control information at the target base station. (In step 4, the UE receives a physical downlink control channel (Physical Downlink Control Channel, PDCCH for short) or a physical downlink shared channel (Physical Downlink Shared Channel, PDSCH for short) in the target cell.

Step 5: The UE disconnects from the source base station, and sends uplink data and control information at the target base station. (In step 5, the UE sends a Physical Random Access Channel (PRACH) or PUSCH channel in the target cell).

Example 2: SeNB change, source secondary base station cell (S-SeNB) to target secondary base station cell (T-SeNB)

FIG. 8 is a schematic diagram of handover when the SeNB is changed according to an embodiment of the present invention, including:

Step S1: The primary base station sends an add request message to the target secondary base station, and carries indication information that needs to be kept connected at the source secondary base station. (as indicated by the keepConnection indication in the SeNB Addition Request message in step S1)

Step S2: The target secondary base station sends an add request response message to the primary base station, where the response message carries the RRC configuration information for the SCG change of the UE, and carries the indication information that the source secondary base station remains connected in the RRC configuration information. (As in step S2, the SeNB adds a reservation connection (remainConnection) in the Addition Request Acknowledge message. Instructions)

Step S3: The primary base station notifies the source secondary base station to initiate a data pre-transmission process. (SME reconfiguration message in step S3)

Step S4: After receiving the SCG change command, the UE maintains a connection with the source secondary base station. (such as the keepConnection in the RCC reconnection configuration (RRCConnectionReconfiguration) message in step S4

Step S4.1: The UE determines to perform radio link detection according to the following conditions:

Receiving an indication that the network side indicates that the source secondary base station remains connected;

There is no timer to start the SCG change failure detection (such as T307);

The MAC entity of the UE is not reset or re-established;

The RLC entity of the UE is not reset or re-established;

The PDCP entity of the UE is not reset or re-established;

No uplink data and/or control information is sent in the target cell;

Not receiving downlink data and/or control information in the target cell;

The UE performs the detection of the wireless link as performing at least one of the following behaviors:

When a wireless link problem occurs, a timer for detecting a wireless link problem (such as T313) is started;

Initiating a radio link problem detection counter (such as N313) when a wireless link problem occurs;

When recovering the wireless link, start a counter for wireless link recovery (such as N314);

Step S4.2: The triggering condition for the UE to start detecting the downlink control channel and/or the data channel of the receiving target cell includes:

The UE completes downlink synchronization with the target cell;

The UE completes the kth subframe after downlink synchronization with the target cell (if the protocol agrees k=4);

Before the UE sends uplink data in the target cell;

The kth subframe before the UE is to send uplink data in the target cell (if the protocol stipulates that k=4);

Before the UE sends the uplink control information in the target cell;

The kth subframe before the UE is to send uplink data in the target cell (if the protocol stipulates that k=4);

Step S5: The UE feeds back a configuration completion message to the primary base station. (As in step S5, the RRC Connection Reconfiguration Complete message (RRCConnectionReconfigurationComplete) message). The RRC is an abbreviation of Radio Resource Control, and corresponds to radio resource connection control.

Step S6: The primary base station notifies the target base station that the UE configuration is completed. (As in step S6, the SeNB Reconfiguration Complete message).

Step S7: The UE disconnects from the source secondary base station, and receives downlink data and control information at the target secondary base station. (The UE receives the PDCCH or PDSCH channel in the target cell as in step S7).

Step S8: The UE disconnects from the source secondary base station, and sends uplink data and control information to the target secondary base station. (In step S8, the UE transmits a PRACH or PUSCH channel in the target cell).

With the method of the embodiment, during the mobility process of the UE, when the connection with the source base station is maintained, the wireless link detection can be initiated, and the wireless link reply can be quickly performed when the wireless link problem occurs. The time for data interruption is reduced by controlling the point in time at which the UE receives the target cell control or data channel.

Example 4

Embodiments of the present invention also provide a storage medium. Optionally, in this embodiment, the foregoing storage medium may be configured to store computer executable code such as program code for performing the following steps; after the computer executable code is executed by a processor or the like, the foregoing one can be implemented. The method for cell handover provided by multiple technical solutions may, for example, at least perform the following steps:

Receiving indication information for indicating a cell handover or a secondary cell group change;

When performing cell handover or auxiliary cell group change, the connection with the source cell is maintained, and the source cell is detected by the radio link.

Optionally, in this embodiment, the foregoing computer storage medium may include but is not limited to: U. A medium that can store program code, such as a disk, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk, or an optical disk. Optionally, the Sohu computer storage medium may be a non-transitory storage medium or a non-volatile storage medium.

The embodiment of the present invention provides a communication device, which may be a base station or a UE, including: a memory and a processor connected to the memory, and the processor and the memory may be connected through a bus interface such as an integrated circuit bus, the processor A method of handover of a cell provided by one or more of the foregoing technical solutions may be implemented by executing computer executable code on a memory.

The processor may be: an application processor (AP), a central processing unit (CPU), a digital signal processor (DSP), or a programmable gate array (FPGA, Field Programmable). Gate Array) or ASIC, quantum calculator or photon calculator.

Optionally, in this embodiment, the processor performs, according to the stored program code stored in the storage medium, receiving indication information for indicating that the cell handover or the auxiliary cell group change is performed;

Optionally, in this embodiment, the processor performs, according to the stored program code in the storage medium, maintains a connection with the source cell when performing cell handover or the change of the secondary cell group, and performs detection of the wireless link of the source cell. .

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. Perform the steps shown or described, or separate them into individual integrated circuit modules, or multiple of them Blocks or steps are made in a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

In the embodiment of the present invention, when the UE performs handover between the source base station and the target base station, the UE not only maintains the connection with the source cell, but also facilitates the UE to perform data transmission during the handover process, and simultaneously performs wireless connection to the source cell. The link is detected. In this way, it is timely to find out whether the connection between the UE and the source cell is interrupted. If a terminal phenomenon occurs, data recovery can be triggered in time, thereby reducing the middle segment of the data caused by the failure of the link. The resulting data loss problem; therefore, it has the beneficial effects of less data loss and less loss of data and strong data transmission reliability. At the same time, it is industrially achievable.

Claims (16)

A method for cell handover includes: Instructing the user equipment UE to perform cell handover or auxiliary cell group change; Instructing the UE to maintain a connection with the source cell and instructing the UE to perform detection of the radio link on the source cell. The method according to claim 1, wherein after instructing the user equipment UE to perform cell handover or auxiliary cell group change, the method further comprises at least one of the following: Instructing the UE to monitor and receive time information of the downlink control channel in the target cell; Instructing the UE to monitor and receive time information of the downlink data channel in the target cell. The method of claim 1 wherein The method further includes: Sending a handover request message to the target cell, where the handover request message includes indication information for indicating that the UE remains connected to the source cell when switching; And receiving the handover response message that is sent by the target cell according to the handover request message, where the handover response message carries radio resource control RRC configuration information and the indication information that the UE performs handover; The indicating that the user equipment UE performs cell handover or the auxiliary cell group change includes: Transmitting the handover response message to the UE. The method of claim 1 wherein the method further comprises: Sending an add request message to the target secondary cell, where the add request message carries indication information for indicating that the UE keeps a connection with the source secondary cell when performing the auxiliary cell group change; And receiving an add request response message that is sent by the target secondary cell according to the add request message, where the request response message carries radio resource control RRC configuration information that is performed by the UE to perform a supplementary cell group change, where the RRC configuration information carries Descriptive information; The indicating that the user equipment UE performs cell handover or the auxiliary cell group change includes: Sending the add request response message to the UE. A cell handover method includes: The user equipment UE receives indication information for indicating a cell handover or a supplementary cell group change; The UE maintains a connection with the source cell when performing cell handover or a supplementary cell group change, and performs radio link detection on the source cell. The method according to claim 5, wherein the condition that the UE determines to perform the detection of the wireless link comprises at least one of the following: Receiving an indication that the network side indicates that the source cell remains connected; The timer that initiates the switch failure detection fails. The timer for starting the detection of the failure of the secondary cell group failure fails; Resetting or reestablishing the media access control MAC entity of the UE fails; Resetting or reestablishing the radio link control RLC entity of the UE fails; The PDCP entity of the packet data convergence protocol of the UE is reset or re-established; Sending uplink data in the target cell; Failed to send control information in the target cell; Receiving downlink data in the target cell; Failed to receive control information in the target cell. The method of claim 6, wherein the detecting of the radio link by the UE to the source cell comprises at least one of the following: A timer for initiating detection of a radio link problem when a radio link problem occurs; A counter that initiates detection of a wireless link problem when a wireless link problem occurs; When the wireless link is restored, the counter for wireless link recovery is started. The method of claim 5, wherein after detecting the wireless link of the source cell, the method further comprises: The UE detects and receives a signal of a channel of the target cell, where the channel of the target cell includes: at least one of a downlink control channel and a data channel of the target cell. The method according to claim 8, wherein the trigger condition for the UE to detect and receive the channel of the target cell comprises at least one of the following: When the UE completes downlink synchronization with the target cell; The kth subframe after the UE completes downlink synchronization with the target cell; When the UE sends uplink data in the target cell; The kth subframe before the UE sends the uplink data in the target cell; When the UE sends uplink control information in the target cell; The kth subframe before the UE sends the uplink data in the target cell; Where k is a positive integer. The method of claim 9 wherein k is a value agreed by the protocol or a value configured by the network. A device for cell handover, which includes: a first indication module, configured to indicate that the user equipment UE performs cell handover or a supplementary cell group change; And a second indication module, configured to indicate that the UE maintains a connection with the source cell, and instructs the UE to perform detection of the radio link on the source cell. The apparatus of claim 11 wherein said apparatus further comprises at least one of: a third indication module, configured to: after the first indication module instructs the user equipment UE to perform a cell handover or a supplementary cell group change, instructing the UE to monitor and receive time information of the downlink control channel in the target cell; And the fourth indication module is configured to: after the first indication module instructs the user equipment UE to perform cell handover or a secondary cell group change, instruct the UE to monitor and receive downlink data in the target cell. Time information of the channel. A cell switching device includes: a receiving module, configured to receive indication information used to indicate a cell handover or a secondary cell group change; The processing module is configured to maintain a connection with the source cell when performing cell handover or a change of the secondary cell group, and perform detection of the wireless link on the source cell. The device of claim 13 wherein said device further comprises: a detecting module, configured to: after detecting, by the processing module, the radio link of the source cell, detecting, and receiving, by the processing, the channel of the target cell, where the channel of the target cell includes: a downlink control channel of the target cell At least one of the data channels. A cell handover system, comprising: a network side device, a user equipment UE, wherein the network side device comprises the apparatus according to claim 11 or 12, and the UE comprises the apparatus according to claim 13 or 14. A computer storage medium having stored therein computer executable instructions for performing the method of any one of claims 1 to 4, or for performing claims 5 to 10 The method of any of the preceding claims.

Images