WO2023024384A1

WO2023024384A1 - Cell handover method and apparatus, configuration method and apparatus, computer-readable storage medium, user equipment, and network device

Info

Publication number: WO2023024384A1
Application number: PCT/CN2021/142866
Authority: WO
Inventors: 邓云
Original assignee: 展讯通信（上海）有限公司
Priority date: 2021-08-25
Filing date: 2021-12-30
Publication date: 2023-03-02
Also published as: CN115915300A

Abstract

A cell handover method and apparatus, a configuration method and apparatus, a computer-readable storage medium, a user equipment, and a network device. The cell handover method comprises: acquiring a handover execution condition for each candidate cell, wherein the type of the handover execution condition comprises a non-DAPS handover execution condition and/or a DAPS handover execution condition; determining whether there is a candidate cell that meets the handover execution condition; and if there is a first candidate cell that meets the non-DAPS handover execution condition and a second candidate cell that meets the DAPS handover execution condition, executing DAPS handover to the second candidate cell. By means of the technical solution of the present invention, when conditional handover and DAPS handover are configured at the same time, the cell handover of a UE can be realized.

Description

Cell handover, configuration method and device, computer-readable storage medium, user equipment, network equipment

This application claims the priority of the Chinese patent application submitted to the China Patent Office on August 25, 2021, with the application number 202110982222.8, and the title of the invention is "cell handover, configuration method and device, computer readable storage medium, user equipment, network equipment" , the entire contents of which are incorporated in this application by reference.

technical field

The present invention relates to the field of communication technology, in particular to a cell switching, configuration method and device, a computer-readable storage medium, user equipment, and network equipment.

Background technique

A conditional switching mechanism is introduced in wireless communication. In the conditional handover mechanism, the user equipment (User Equipment, UE) judges whether the handover execution condition is satisfied, and when the condition is met, the UE uses the configuration parameters of the candidate target cell included in the handover command to access the target cell.

A Dual Active Protocol Stack (DAPS) switch is also introduced in wireless communication. In the traditional handover process, there will always be user plane interruption time, because once the UE receives the handover command, the UE will interrupt the communication with the source base station, and instead synchronize to the target cell and perform the random access process, when the random access is successful After that, the UE can continue to perform data transmission with the target base station, and there is a certain interruption time in between. In order to achieve a handover delay of 0 milliseconds (ms), the newly introduced DAPS handover requires the UE to maintain communication with the source base station and the target base station at the same time during the handover process. During the handover process, the UE waits until the UE has started normal communication with the target cell before releasing the connection with the source base station.

However, in the case of configuring conditional handover and DAPS handover at the same time, how to implement cell handover of UE is a technical problem to be solved urgently.

Contents of the invention

The technical problem solved by the present invention is how to realize cell switching of UE under the condition of configuring conditional switching and DAPS switching at the same time.

In order to solve the above technical problems, an embodiment of the present invention provides a cell handover method, the cell handover method includes: obtaining handover execution conditions of each candidate cell, the type of handover execution conditions includes non-DAPS handover execution conditions and/or DAPS handover execution conditions Condition: judging whether the candidate cell satisfies the handover execution condition; if there is a first candidate cell satisfying the non-DAPS handover execution condition and a second candidate cell satisfying the DAPS handover execution condition, performing DAPS handover to the second candidate cell.

Optionally, performing DAPS handover to the second candidate cell includes: if there are multiple second candidate cells, randomly selecting a second candidate cell from multiple second candidate cells to perform DAPS handover .

Optionally, the acquiring the handover execution conditions of each candidate cell includes: acquiring a handover command, where the handover command includes handover execution conditions of one or more candidate cells.

Optionally, the DAPS handover execution condition includes a first condition and a second condition, the first condition indicates a requirement for a signal quality of a candidate cell, and the second condition indicates a requirement for a signal quality of a serving cell.

Optionally, the first condition includes measurement event A3 and/or measurement event A5 and/or measurement event A4, and the second condition includes measurement event A1; or, the first condition includes measurement event A3 and/or Measuring event A5 and/or measuring event A4, the second condition includes not running timer T310.

The embodiment of the present invention also discloses a handover configuration method. The handover configuration method includes: configuring the handover execution conditions of each candidate cell, and the types of the handover execution conditions include non-DAPS handover execution conditions and/or DAPS handover execution conditions; sending each A handover execution condition of a candidate cell, where the handover execution condition is used to perform DAPS handover to the second candidate cell when there is a first candidate cell that satisfies the non-DAPS handover execution condition and a second candidate cell that satisfies the DAPS handover execution condition .

Optionally, the sending the handover execution conditions of each candidate cell includes: sending a handover command, where the handover command includes the handover execution conditions of one or more candidate cells.

The embodiment of the present invention also discloses a cell handover device. The cell handover device includes: an acquisition module for acquiring handover execution conditions of each candidate cell, and the type of handover execution conditions includes non-DAPS handover execution conditions and/or DAPS handover execution conditions Execution condition; judging module, used to judge whether the candidate cell satisfies the handover execution condition; handover module, used for if there is a first candidate cell meeting the non-DAPS handover execution condition and a second candidate cell satisfying the DAPS handover execution condition, then to all The second candidate cell performs DAPS handover.

The embodiment of the present invention also discloses a handover configuration device. The handover configuration device includes: a configuration module configured to configure the handover execution conditions of each candidate cell, and the types of the handover execution conditions include non-DAPS handover execution conditions and DAPS handover execution conditions The sending module is used to send the handover execution condition of each candidate cell, and the handover execution condition is used to send the handover execution condition to the first candidate cell satisfying the non-DAPS handover execution condition and the second candidate cell satisfying the DAPS handover execution condition The second candidate cell performs DAPS handover.

The embodiment of the present invention also discloses a cell handover method, which is applied to user equipment. The cell handover method includes: acquiring handover execution conditions of one or more candidate cells, and the types of handover execution conditions include non-DAPS handover execution conditions and /or DAPS handover execution conditions; access the candidate cell when the candidate cell meets the handover execution conditions; report the type of cell handover, the type of cell handover includes non-DAPS handover or DAPS handover.

Optionally, the reporting the type of cell switching includes: when the candidate cell satisfies the DAPS switching execution condition, reporting the cell switching type is DAPS switching; or, when the candidate cell does not meet the DAPS switching execution condition condition, the reported cell handover type is non-DAPS handover.

Optionally, the cell handover method further includes: when the candidate cell does not satisfy the DAPS handover execution condition, configuring the PDCP entity of the established data radio bearer as the PDCP entity only associated with the candidate cell.

Optionally, the reporting the type of cell switching includes: reporting the type of cell switching through message 2 or message 4 in a random access procedure.

The embodiment of the present invention also discloses a cell handover method. The cell handover method includes: receiving the cell handover type, the cell handover type is a candidate cell configured with DAPS handover execution conditions, and the user equipment meets the handover execution requirements in the cell. After the condition, it is set when accessing the candidate cell, the type of cell handover includes non-DAPS handover or DAPS handover; PDCP entity is configured according to the type of cell handover.

Optionally, configuring the PDCP entity according to the type of the cell handover includes: for the wireless data bearer configured as DAPS handover, when the type of the cell handover is non-DAPS handover, configuring the PDCP entity of the data wireless bearer It is configured to only associate with the PDCP entity of the candidate cell.

The embodiment of the present invention also discloses a computer-readable storage medium, on which a computer program is stored, and when the computer program is run by a processor, the steps of the cell handover method are executed, or the steps of the handover configuration method are executed.

The embodiment of the present invention also discloses a user equipment, including a memory and a processor, the memory stores a computer program that can run on the processor, and the processor executes the cell when running the computer program. Steps to switch methods.

The embodiment of the present invention also discloses a network device, including a memory and a processor, the memory stores a computer program that can run on the processor, and the processor executes the switching when running the computer program Steps in the configuration method or the cell handover method.

Compared with the prior art, the technical solutions of the embodiments of the present invention have the following beneficial effects:

In the technical solution of the present invention, the UE can acquire the handover execution conditions of each candidate cell, and the types of the handover execution conditions include non-DAPS handover execution conditions and/or DAPS handover execution conditions. That is, some candidate cells support DAPS handover, and some candidate cells support non-DAPS handover. Then, when there is both a first candidate cell that satisfies the non-DAPS handover execution condition and a second candidate cell that satisfies the DAPS handover execution condition, the UE performs DAPS handover to the second candidate cell, that is, the UE performs DAPS handover preferentially, The cell handover under the condition of configuring conditional handover and DAPS handover at the same time is realized, which can not only improve the handover success rate but also reduce the handover interruption delay.

Description of drawings

FIG. 1 is a flow chart of a cell handover method according to an embodiment of the present invention;

FIG. 2 is a flow chart of a cell handover configuration method according to an embodiment of the present invention;

Fig. 3 is an interactive flowchart of an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a cell handover device according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a cell handover configuration device according to an embodiment of the present invention;

FIG. 6 is a flow chart of another cell handover method according to an embodiment of the present invention;

Fig. 7 is a flow chart of another cell handover method according to the embodiment of the present invention.

Detailed ways

As mentioned in the background, in the case of configuring conditional handover and DAPS handover at the same time, how to implement cell handover of UE is a technical problem to be solved urgently.

The Fangming technical solution can be applied to 5G (5 Generation) communication systems, 4G, 3G communication systems, and various new communication systems in the future, such as 6G, 7G, etc.

In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Fig. 1 is a flowchart of a cell handover method according to an embodiment of the present invention.

The cell handover method shown in FIG. 1 can be used on the user equipment side, that is, the user equipment can execute various steps of the method. The user equipment includes, but is not limited to, terminal equipment such as mobile phones, computers, and tablet computers.

Specifically, the cell switching method may include the following steps:

Step 101: Acquiring the handover execution conditions of each candidate cell, the types of the handover execution conditions include non-DAPS handover execution conditions and/or DAPS handover execution conditions;

Step 102: judging whether the candidate cell satisfies the handover execution condition;

Step 103: If there is a first candidate cell satisfying the non-DAPS handover execution condition and a second candidate cell satisfying the DAPS handover execution condition, perform DAPS handover to the second candidate cell.

It should be noted that the sequence numbers of the steps in this embodiment do not represent a limitation on the execution order of the steps.

In this embodiment, each candidate cell may be one candidate cell, or may be multiple candidate cells.

In specific implementation, for the same candidate cell, it can be considered that when the DAPS handover execution condition is satisfied, the non-DAPS handover execution condition is also satisfied, and at this time, the UE always performs DAPS handover for the candidate cell. That is, if the second candidate cell is the first candidate cell, the UE performs DAPS handover for the candidate cell.

It can be understood that, in a specific implementation, the cell handover method may be implemented in the form of a software program, and the software program runs in a processor integrated in a chip or a chip module.

In this embodiment, the UE can obtain the handover execution condition (Handover execution condition) of each candidate cell from the handover command. Different candidate cells may be configured with different or the same handover execution conditions. For example, the handover execution condition of the candidate cell Cell1 may be a DAPS handover execution condition, the handover execution condition of the candidate cell Cell2 may be a non-DAPS handover execution condition, and the handover execution condition of the candidate cell Cell3 may be a DAPS handover execution condition.

For example, when the UE establishes data radio bearers (Data Radio Bearer, DRB) DRB1, DRB2, and DRB3, when the handover command includes the candidate cell cell1, DRB1 is configured as DAPS handover, and the corresponding handover execution conditions are called DAPS handover execution conditions, At this time, DRB2 and DRB3 can be configured as non-DAPS handover; for candidate cell cell1, you can configure the handover execution conditions corresponding to non-DAPS handover, that is, the handover execution conditions corresponding to normal handover. At this time, all DRBs are not configured as DAPS handover; for other For a candidate cell such as cell2, if all DRBs are not configured for DAPS handover, then the network configures handover execution conditions corresponding to non-DAPS handover.

In a specific embodiment, the DAPS handover execution condition includes a first condition and a second condition, the first condition indicates the requirement for the signal quality of the candidate cell, and the second condition indicates the requirement for the signal quality of the serving cell. The non-DAPS handover execution condition may only include the first condition.

Specifically, the first condition includes measurement event A3 and/or measurement event A5 and/or measurement event A4, and the second condition includes measurement event A1;

Alternatively, the first condition includes the measurement event A3 and/or the measurement event A5 and/or the measurement event A4, the second condition includes the timer T310 not running, and the second condition may also be that the timer T310 has not timed out.

In a specific implementation, when judging whether the candidate cell satisfies the handover execution condition, the UE may perform signal measurement, such as measuring the signal quality of the candidate cell and/or measuring the signal quality of the serving cell. And compare the signal quality of the candidate cell and/or the signal quality of the serving cell with the handover execution condition. Wherein, the serving cell may be a primary cell accessed by the UE, or any serving cell in a carrier aggregation state. Specifically, the signal quality can have different forms, such as the received power of the reference signal, or the received quality of the reference signal, or the signal-to-interference-noise ratio of the reference signal, and so on.

It should be noted that if the UE finds that T310 has been running and has timed out, the UE considers that the second condition is not met. In practice, there are other ways to determine whether the serving cell satisfies the second condition. For example, if the radio link failure occurs in the serving cell, or the UE finds that it is out of synchronization with the serving cell, it can be considered that the signal quality of the serving cell does not meet the requirements, and the UE Cannot perform DAPS switchover. In other words, the second condition in the embodiment of the present invention may be that no radio link failure occurs in the serving cell or synchronization with the serving cell occurs.

In this embodiment, when there is a first candidate cell that satisfies the non-DAPS handover execution condition and a second candidate cell that satisfies the DAPS handover execution condition, the UE performs DAPS handover to the second candidate cell, that is, the UE has priority Perform DAPS switchover.

Specifically, the UE uses the configuration parameters of the second candidate cell included in the handover command to access the second candidate cell, obtains synchronization with the second candidate cell, initiates a random access procedure in the second candidate cell, and sends the handover complete command ( That is, after radio resource control (Radio Resource Control, RRC) reconfiguration is completed), the UE implements handover to the second candidate cell. During the handover process, the UE maintains communication with the source base station and the target base station (ie, the base station to which the second candidate cell belongs) at the same time. During the handover process, the UE releases the connection with the source base station after the UE has started normal communication with the second candidate cell and receives an instruction to release the source side link sent by the second candidate cell.

The embodiment of the present invention realizes cell handover under the condition of simultaneously configuring conditional handover and DAPS handover, which can not only improve handover success rate but also reduce handover interruption delay.

In a non-limiting embodiment, if there are multiple second candidate cells, one second candidate cell is randomly selected from the multiple second candidate cells to perform DAPS handover.

In a specific application scenario, after the UE receives the configurations of the candidate cells Cell1, Cell2, and Cell3 and the corresponding handover execution conditions, the UE evaluates the signal quality of the three candidate cells and the signal quality of the serving cell. It is possible that the candidate cells Cell1 and Cell2 meet the handover execution conditions at the same time. At this time, the UE finds that Cell1 can perform DAPS handover, that is, Cell1 meets the measurement event A3/A5/A4, and the serving cell meets the measurement event A1 or the timer T310 is not started. Cell2 can only perform normal switching. At this time, the UE preferably performs DAPS handover, that is, performs handover to Cell1 preferentially.

For another scenario, the candidate cells Cell1 and Cell3 meet the handover execution conditions at the same time, and both Cell1 and Cell3 can implement DAPS handover, at this time, the UE can randomly select Cell1 or Cell3 to perform handover. Alternatively, the UE may select a candidate cell with the best signal quality to perform handover, or the UE may preferentially select a candidate cell with the same frequency as the serving cell to perform handover.

Correspondingly, the network device can execute the handover configuration method shown in FIG. 2 . The network device may be a source base station.

Specifically, the switching configuration method includes the following steps:

Step 201: Configure handover execution conditions for each candidate cell, the types of handover execution conditions include non-DAPS handover execution conditions and/or DAPS handover execution conditions;

Step 202: Send the handover execution conditions of each candidate cell, and the handover execution conditions are used to notify the second candidate cell when there is a first candidate cell satisfying the non-DAPS handover execution condition and a second candidate cell satisfying the DAPS handover execution condition. The candidate cell performs DAPS handover.

In specific implementation, the source base station can confirm whether it supports DAPS handover according to the feedback from the candidate target base station, so as to configure the handover execution conditions of each candidate cell.

The source base station sends the handover execution condition to the UE through the handover command.

In a specific application scenario, a UE establishes three bearers, DRB1, DRB2, and DRB3. Among them, DRB1 has higher requirements for service quality parameters and requires a shorter data transmission delay. Therefore, the serving base station (the source base station before the handover) Prepare to configure DAPS switching for DRB1, while the other two DRBs do not configure DAPS switching. At the same time, in order to meet the handover success rate, the serving base station intends to configure conditional handover for the UE. After receiving the measurement report sent by the UE, the serving base station finds that the UE is no longer in the central area of the cell. To satisfy mobility, the serving base station selects Cell1 and Cell2 as candidate cells for UE handover according to the measurement report reported by the UE. Then the source base station (after negotiating with the candidate base station) can indicate that for the candidate cell Cell1, DRB1 is configured as DAPS handover, the other two DRBs are non-DAPS handover, and the corresponding handover execution conditions; indicate that the candidate cell Cell2 is non-DAPS Switching (that is, conditional switching), and the corresponding switching execution conditions.

The handover command can be sent to the UE through one RRC signaling or multiple RRC signalings, that is, the first condition and the second condition can be sent simultaneously, or the first condition and the second condition can be sent separately.

Please refer to FIG. 3 , which shows an interaction flowchart.

In step 301 , the source base station 302 sends a handover request to the candidate target base station 303 .

In step 302 , the source base station 302 sends a handover request to the candidate target base station 304 .

In a specific implementation, the source base station 302 selects the candidate cells Cell1, Cell2 and Cell3 as the candidate cells for UE301 handover according to the measurement report reported by the UE301, and the source base station 302 can sequentially report to the base stations to which these three cells belong (that is, the candidate target base station 303 and the candidate cell). The target base station 304) sends a handover request. The base station to which the candidate cell Cell3 belongs is not shown in the figure. The indication in the handover request is a conditional handover.

In a specific implementation, the handover request sent by the source base station 302 to the base station to which Cell1 belongs (candidate target base station 303) indicates that this handover is a conditional handover, and indicates that the DRB1 request is configured as a DAPS handover, and that the other two DRBs are non-DAPS handovers. The request does not need to indicate the handover execution condition to the candidate target base station 303 .

The handover request sent by the source base station 302 to the base station to which Cell2 belongs (candidate target base station 304 ) indicates that this handover is a conditional handover. The source base station 302 judges based on the bandwidth combination supported by the UE301 that the handover of the UE301 from the serving cell to the Cell2 cannot support the DAPS handover, so the handover request does not include DAPS handover information.

The handover request sent by the source base station 302 to the base station to which Cell3 belongs indicates that this handover is conditional handover, and indicates that DRB1 is configured as DAPS handover, and the other two DRBs are non-DAPS handover.

In step 303 , the candidate target base station 303 sends a handover request confirmation to the source base station 302 .

In step 304 , the candidate target base station 304 sends a handover request acknowledgment to the source base station 302 .

In specific implementation, candidate

target base stations

303 and 304 can decide whether to accept the handover request based on their own load levels, and if accepted, configure necessary radio resources for the UE, and then return a handover request confirmation (which may be called Handover Request Acknowledge, or Handover Preparation Acknowledge); if not accepted, return request failure to the source base station.

In specific implementation, for the candidate target base station 303, if the handover request is accepted, there may be two kinds of processing:

1. The candidate target base station 303 can configure radio resources that only support conditional handover (that is, radio resource configuration only for conditional handover, which does not include DAPS handover information), and then return a handover request confirmation to the source base station 302;

2. The candidate target base station 303 can configure wireless resources that support conditional handover and DAPS handover. For this scenario, the candidate target base station 303 configures DRB1 for DAPS handover, and additionally configures DAPS-related parameters for the UE. Specifically, it can be power control parameters, such as configuring During the DAPS handover process, the uplink power sharing mode (uplinkPowerSharingDAPS-Mode), configured wireless parameters, etc., are used by UE301 after judging that Cell1 satisfies the handover execution condition.

The candidate target base station 303 may respectively indicate to the source base station to configure only radio resources supporting conditional handover, and to configure radio resources supporting conditional handover and DAPS handover through two independent interface signalings.

The candidate target base station 303 can also indicate in a handover request confirmation message that only the first radio resource configuration (Target NG-RAN node To Source NG-RAN node Transparent Container 1) that supports conditional handover is configured, and that the configuration supports conditional handover and DAPS Switched second radio resource configuration (Target NG-RAN node To Source NG-RAN node Transparent Container 2). Usually, the wireless resources configured by the candidate target base station for the UE are placed in a transparent container (Transparent Container), and the source base station does not need to parse the content in this container, and sends it directly to the UE. If a handover request acknowledgment message indicates that only radio resources that support conditional handover (indicated by Transparent Container 1) and wireless resources that support conditional handover and DAPS handover (indicated by Transparent Container 2) are configured, the candidate target base station needs to send The source base station specifies which configuration corresponds to the Transparent Container. The candidate target base station can indicate that Transparent Container 2 is configured with DAPS (indicated by an additional cell), while Transparent Container 1 is not configured with DAPS; or only indicates that Transparent Container 2 is configured with DAPS, and does not indicate that Transparent Container 1 with DAPS is not included by default. DAPS.

The candidate target base station 304 only needs to configure the radio resource corresponding to the handover condition, and then send it to the source base station 302 through a handover request confirmation. The base station to which the candidate cell Cell3 belongs may adopt the same processing mechanism as that of the candidate target base station 303 .

In step 305, the source base station 302 sends a handover command to the UE 301 .

Specifically, after receiving handover request confirmations returned by different candidate target base stations, the source base station 302 configures corresponding handover execution conditions, carries them in the handover command and sends them to the UE. Different candidate cells may be configured with different or the same handover execution conditions.

In step 306, UE301 measures and evaluates the signal quality of the candidate cell and the signal quality of the serving cell.

In step 307, UE301 executes handover when the candidate cell satisfies the handover execution condition.

In specific implementation, for the candidate cell Cell1, there are two radio resource configurations, and the source base station 302 can set different handover execution conditions. In addition to using the original handover execution conditions such as events A3 and/or A5 and/or A4, the source base station 302, , it is also necessary to set the signal quality of the serving cell to meet certain requirements. For example, event A1 can be added. At this time, the handover execution conditions include A3/A5/A4+A1, which are respectively for the candidate target cell and the serving cell. For example, the transmission transparent container (Transparent Container 2) is configured with DAPS conditional handover, and the source base station 302 configures A3/A5/A4+A1 as the handover execution condition of Cell1, and the UE receives the transparent container 2 and A3/A5/A4+A1 After the handover execution conditions, start to evaluate Cell1 and the serving cell, if Cell1 meets A3/A5/A4, and the serving cell meets A1, the UE performs handover to Cell1, and the UE configures the DAPS handover configuration for the UE based on Cell1 (via Transparent Container 2) , implement DAPS handover, that is, DAPS handover is adopted for DRB1, and the UE reconfigures the PDCP entity of DRB1 as a PDCP entity for DAPS handover. At this time, the PDCP entity can process data from the source side and the target side at the same time. When entering Cell1, continue to maintain the connection with the serving cell. After the UE successfully accesses Cell1, the UE maintains data transmission with the source serving cell and Cell1 at the same time. When Cell1 sends a release source connection to the UE, the UE will release the connection with the source side. side connections.

In an optional embodiment, for the candidate cell Cell1 configured with DAPS conditional handover, the source base station may not explicitly configure the handover execution conditions, and use the existing A3/A5/A4 to determine whether the neighboring cell meets the handover conditions; The signal quality of the serving cell determines whether to perform DAPS handover if T310 is started. When T310 is not running (including no timeout), UE performs DAPS handover; otherwise, UE performs non-DAPS handover.

For the candidate cell Cell2, the source base station 302 may only set the handover execution condition of A3/A5/A4, so that the UE evaluates whether the handover execution condition is met for Cell2.

For the candidate cell Cell3, the source base station 302 can set the handover execution conditions of A3/A5/A4+A1, or only set the handover execution conditions of A3/A5/A4, and the UE additionally uses T310 to judge the DAPS handover.

In a specific implementation, after UE301 receives configurations of candidate cells Cell1, Cell2, and Cell3 and corresponding handover execution conditions, UE evaluates the signal quality of the three candidate cells and the signal quality of the serving cell. It is possible that the candidate cell Cell1 and the candidate cell Cell2 meet the handover execution conditions at the same time. At this time, UE301 finds that DAPS handover can be performed for Cell1, that is, Cell1 satisfies the measurement event A3/A5/A4, and the serving cell satisfies the measurement event A1 or T310 is not started (including T310 not timed out), while for Cell2 only normal switching can be performed. At this time, UE301 preferably performs DAPS handover, that is, performs handover to Cell1 preferentially. Further, if Cell1 and Cell3 simultaneously meet the handover execution conditions, and both Cell1 and Cell3 can implement DAPS handover, UE301 may randomly select Cell1 or Cell3 to perform handover.

In step S308 , random access is performed between the UE 301 and the candidate target base station 303 .

In step S309 , UE 301 sends RRC reconfiguration complete to candidate target base station 303 .

In a specific implementation, UE301 may report the handover type in the RRC reconfiguration complete signaling.

For example, UE301 finds that only the signal quality of Cell1 meets the measurement event A3/A5/A4, but the signal quality of the serving cell is not satisfied with the measurement event A1. At this time, the UE performs a handover to Cell1, which is a normal handover, that is, DRB1 is not suitable for DAPS handover . The UE reconfigures the PDCP entity of DRB1 as a PDCP entity applicable to Cell1, and when the UE performs handover, the connection with the source serving cell is interrupted. In order for the candidate target base station 303 to know in time that this handover is only a normal handover, that is, a non-DAPS handover, when the UE successfully accesses Cell1, it indicates to the candidate target base station 303 that this handover is a non-DAPS handover or a normal handover, so that the candidate target base station 303 For the DRB1 to restore the PDCP entity that does not support DAPS, that is, the normal PDCP entity, trigger the Path Switch on the core network side in time.

For accessing the target cell through a random access process between the UE and the base station, reference may be made to the prior art, which will not be repeated here.

Referring to FIG. 4 , the embodiment of the present invention also discloses a cell handover device 40 . The cell switching device 40 may include:

An acquisition module 401, configured to acquire handover execution conditions of each candidate cell, where the types of handover execution conditions include non-DAPS handover execution conditions and/or DAPS handover execution conditions;

Judging module 402, used to judge whether the candidate cell satisfies the handover execution condition;

The handover module 403 is configured to perform DAPS handover to the second candidate cell if there is a first candidate cell meeting the non-DAPS handover execution condition and a second candidate cell meeting the DAPS handover execution condition.

In an optional embodiment, a non-DAPS handover execution condition and a DAPS handover execution condition may be configured for the same candidate cell, and if the two execution conditions are satisfied at the same time, the UE preferentially executes the DAPS handover to the candidate cell.

In a specific implementation, the above-mentioned cell switching device may correspond to a chip with a cell switching function in the user equipment, such as a SOC (System-On-a-Chip, system on chip), a baseband chip, etc.; A chip module with a switching function; or corresponding to a chip module with a chip with a data processing function, or corresponding to a user equipment.

Referring to FIG. 5 , the embodiment of the present invention also discloses a cell handover configuration device 50 . The cell switching configuration device 50 may include:

Configuration module 501, configured to configure handover execution conditions of each candidate cell, where the type of handover execution conditions includes non-DAPS handover execution conditions and/or DAPS handover execution conditions;

The sending module 502 is configured to send the handover execution condition of each candidate cell, and the handover execution condition is used to send the handover execution condition to all candidate cells when there is a first candidate cell satisfying the non-DAPS handover execution condition and a second candidate cell satisfying the DAPS handover execution condition The second candidate cell performs DAPS handover.

In a specific implementation, the above-mentioned cell switching configuration device may correspond to a chip with a cell switching configuration function in the network device, such as a SOC (System-On-a-Chip, system on chip), a baseband chip, etc.; or correspond to a network device including A chip module with a cell switching configuration function; or corresponding to a chip module with a data processing function chip, or corresponding to a network device.

For more details about the working principle and working mode of the cell handover device 40 or the cell handover configuration device 50, you can refer to the relevant descriptions in Fig. 1 to Fig. 3 , which will not be repeated here.

Regarding each device described in the above embodiments, each module/unit contained in the product may be a software module/unit, or a hardware module/unit, or may be partly a software module/unit and partly a hardware module/unit. . For example, for each device or product applied to or integrated into a chip, each module/unit contained therein may be realized by hardware such as a circuit, or at least some modules/units may be realized by a software program, and the software program Running on the integrated processor inside the chip, the remaining (if any) modules/units can be realized by means of hardware such as circuits; They are all realized by means of hardware such as circuits, and different modules/units can be located in the same component (such as chips, circuit modules, etc.) or different components of the chip module, or at least some modules/units can be realized by means of software programs, The software program runs on the processor integrated in the chip module, and the remaining (if any) modules/units can be realized by hardware such as circuits; /Units can be realized by means of hardware such as circuits, and different modules/units can be located in the same component (such as chips, circuit modules, etc.) or different components in the terminal, or at least some modules/units can be implemented in the form of software programs Realization, the software program runs on the processor integrated in the terminal, and the remaining (if any) modules/units can be implemented by means of hardware such as circuits.

Referring to FIG. 6 , the embodiment of the present invention also discloses another cell handover method, which can be used on the user equipment side, that is, the user equipment can perform each step of the method.

Specifically, the cell switching method may include the following steps:

Step 601: Obtain handover execution conditions of one or more candidate cells, the type of handover execution conditions includes non-DAPS handover execution conditions and/or DAPS handover execution conditions;

Step 602: accessing the candidate cell when the candidate cell satisfies the handover execution condition;

Step 603: Report the type of cell handover, the type of cell handover includes non-DAPS handover or DAPS handover.

In the embodiment of the present invention, the UE acquires the handover execution condition from the handover command, and performs cell handover accordingly. In order for the target cell to know in time whether this handover is non-DAPS handover or DAPS handover, the UE may report the handover type to the target base station to which the candidate cell belongs when it successfully accesses the candidate cell (the target cell at this time).

In a specific implementation, if the handover type is non-DAPS handover, the target base station configures a normal PDCP entity, and triggers a path switch (Path Switch) on the core network side in time. If the handover type is DAPS handover, after the target base station finds that the UE has successfully accessed during the random access process, the target base station will send a handover success (Handover Success) signaling to the source base station to notify the UE that the UE has successfully accessed, and the source base station will send a notification to the target base station. The base station returns a sequence number status transfer (SN STATUS TRANSFER) message to notify about the data transmission status information carried by the DAPS.

In a specific embodiment, when the UE performs DAPS handover, it reports the handover type as DAPS handover, and when the UE performs non-DAPS handover, it reports the handover type as non-DAPS handover.

In another specific embodiment, when the UE performs DAPS handover, it reports the handover type as DAPS handover, and when the UE performs non-DAPS handover, it does not need to report the handover type. Correspondingly, if the target base station does not receive the handover type, it indicates that the UE is performing a non-DAPS handover at this time.

In yet another specific embodiment, when the UE performs non-DAPS handover, it reports the handover type as non-DAPS handover; when the UE performs DAPS handover, it does not need to report the handover type. Correspondingly, if the target base station does not receive the handover type, it indicates that the UE is performing DAPS handover at this time.

In a non-limiting embodiment, when the candidate cell does not satisfy the DAPS handover execution condition, the UE configures the PDCP entity of the established data radio bearer as only the PDCP entity associated with the candidate cell.

In a non-limiting embodiment, the UE may report the cell handover type through message 2 or message 4 in the random access procedure.

Specifically, in the random access process, the UE can indicate to the target base station that this handover is DAPS through the fourth message (4-step random access process) or MSGB (the second message in the 2-step random access process). Toggle or Normal Toggle. The target base station can be aware of the type of handover in time, so as to take corresponding actions in time. For example, during DAPS handover, it needs to send Handover Success to the source base station to notify the UE that it has accessed the target cell.

In a specific application scenario, the handover execution conditions of the measurement events A3/A5/A4+A1 are configured for the candidate cell Cell1 at the same time. If the UE finds that the signal quality of the candidate cell Cell1 meets the measurement event A3/A5/A4, but the signal quality of the serving cell does not meet the measurement event A1, then the UE performs a handover to the candidate cell Cell1, which is a normal handover, that is, DRB1 does not Apply DAPS switching. The UE reconfigures the PDCP entity of DRB1 as a PDCP entity applicable to Cell1, and when the UE performs handover, the connection with the source serving cell is interrupted. In order for the target cell to know in time that this handover is only a normal handover, that is, a non-DAPS handover, when the UE successfully accesses Cell1, it indicates to Cell1 that this handover is a non-DAPS handover or a normal handover, so that Cell1 does not support DAPS for DRB1 recovery. The PDCP entity, that is, a normal PDCP entity, triggers a path switch (Path Switch) on the core network side in time.

In an optional embodiment, for the candidate cell Cell1 configured with DAPS conditional handover, the source base station can set the handover execution conditions to include A3/A5/A4+A1 to determine whether to perform DAPS handover, and can set the handover execution conditions to include A3 /A5/A4 are used to judge common non-DAPS switching. The thresholds for A3/A5/A4 in the DAPS handover execution condition and A3/A5/A4 in the non-DAPS handover execution condition may be the same or different. Taking the A3 event as an example (the signal quality of the candidate cell is higher than that of the serving cell by a predetermined offset), the offset corresponding to A3 in the DAPS handover execution condition can be the same as the offset corresponding to A3 in the non-DAPS handover execution condition ; It is also possible to set the offset corresponding to A3 in the non-DAPS switching execution condition to take a higher value such as 3db, and the offset corresponding to A3 in the DAPS switching execution condition to take a lower value such as 0db, In this way, it is easier for the UE to trigger the DAPS handover, so as to reduce the handover interruption delay. If the handover execution condition is the A4 event (the signal quality of the candidate cell is higher than the preset threshold), at this time, a higher threshold can be set for the A4 event in the non-DAPS handover execution condition. Correspondingly, if the handover execution condition is A5 event (the signal quality of the serving cell is lower than the threshold 1 and the signal quality of the candidate cell is higher than the threshold 2), you can set the threshold 2 higher and the threshold 1 lower in the non-DAPS handover execution condition, so that It makes it easier for the UE to trigger DAPS handover.

Correspondingly, referring to FIG. 7 , the embodiment of the present invention also discloses yet another cell handover method, which can be used on the target base station side, that is, each step of the method can be executed by the target base station.

Specifically, the cell handover method may include the following steps:

Step 701: Receive the type of cell handover, the type of cell handover is set when the user equipment accesses the candidate cell after the cell satisfies the handover execution conditions for the candidate cell configured with the DAPS handover execution conditions, the The type of cell handover includes non-DAPS handover or DAPS handover;

Step 702: Configure a PDCP entity according to the type of cell handover.

In the specific implementation of step 702, for the radio data bearer configured as DAPS handover, when the type of cell handover is non-DAPS handover, the PDCP entity of the data radio bearer is configured to be only associated with the PDCP of the candidate cell entity.

The embodiment of the present invention also discloses a storage medium, the storage medium is a computer-readable storage medium on which a computer program is stored, and the computer program can execute the steps of the foregoing method when running. The storage medium may include ROM, RAM, magnetic or optical disks, and the like. The storage medium may also include a non-volatile memory (non-volatile) or a non-transitory (non-transitory) memory, and the like.

The embodiment of the present invention also discloses a user equipment. The user equipment may include a memory and a processor, and a computer program that can run on the processor is stored in the memory. When the processor runs the computer program, it can execute the steps of the aforementioned cell handover method.

The embodiment of the present invention also discloses a network device. The network device may include a memory and a processor, and a computer program that can run on the processor is stored in the memory. When the processor runs the computer program, it may execute the steps of the aforementioned cell handover method or cell handover configuration method. The network equipment includes but is not limited to a target base station and a source base station.

The Fangming technical solution is also applicable to different network architectures, including but not limited to relay network architecture, dual-link architecture, Vehicle-to-Everything (vehicle-to-everything communication) architecture and other architectures.

The core network described in the embodiment of the present application may be an evolved packet core network (evolved packet core, EPC for short), a 5G Core Network (5G core network), or a new core network in a future communication system. The 5G Core Network is composed of a group of devices, and implements access and mobility management functions (Access and Mobility Management Function, AMF), and provides functions such as data packet routing and forwarding, and QoS (Quality of Service) management. User plane function (User Plane Function, UPF), session management function (Session Management Function, SMF) that provides functions such as session management, IP address allocation and management, etc. EPC can be composed of MME that provides functions such as mobility management and gateway selection, Serving Gateway (S-GW) that provides functions such as data packet forwarding, and PDN Gateway (P-GW) that provides functions such as terminal address allocation and rate control.

The base station (base station, BS for short) in the embodiment of the present application may also be referred to as base station equipment, which is a device deployed in a radio access network (RAN) to provide wireless communication functions. For example, the equipment providing base station function in 2G network includes base wireless transceiver station (English: base transceiver station, referred to as BTS), the equipment providing base station function in 3G network includes Node B (NodeB), and the equipment providing base station function in 4G network Including evolved Node B (evolved NodeB, eNB), in wireless local area networks (wireless local area networks, referred to as WLAN), the equipment that provides base station functions is the access point (access point, referred to as AP), 5G new wireless (New Radio , referred to as NR), the device gNB that provides base station functions, and the node B (ng-eNB) that continues to evolve, in which gNB and the terminal use NR technology for communication, and the ng-eNB and the terminal use E-UTRA (Evolved Universal Terrestrial Radio Access) technology for communication, both gNB and ng-eNB can be connected to the 5G core network. The base station in the embodiment of the present application also includes devices that provide base station functions in future new communication systems, and the like.

The base station controller in the embodiment of the present application is a device for managing base stations, such as a base station controller (BSC for short) in a 2G network and a radio network controller (radio network controller, RNC for short) in a 3G network. ), can also refer to the device for controlling and managing the base station in the new communication system in the future.

The network-side network in the embodiment of the present invention refers to a communication network that provides communication services for terminals, including a base station of a wireless access network, a base station controller of the wireless access network, and equipment on the core network side.

The terminal in the embodiment of the present application may refer to various forms of user equipment (user equipment, referred to as UE), access terminal, user unit, user station, mobile station, mobile station (mobile station, built as MS), remote station, remote terminal, mobile device, user terminal, terminal equipment, wireless communication device, user agent, or user device. The terminal device can also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), Handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in future 5G networks or future evolution of public land mobile communication networks (Public Land Mobile Network, referred to as PLMN), etc., which are not limited in this embodiment of the present application.

It should be understood that the term "and/or" in this article is only an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B may mean: A exists alone, and A and B exist at the same time , there are three cases of B alone. In addition, the character "/" in this article indicates that the associated objects are an "or" relationship.

"Multiple" appearing in the embodiments of the present application means two or more.

The first, second, etc. descriptions that appear in the embodiments of this application are only for illustration and to distinguish the description objects. Any limitations of the examples.

The "connection" in the embodiment of the present application refers to various connection methods such as direct connection or indirect connection to realize communication between devices, which is not limited in the embodiment of the present application.

It should be understood that, in the embodiments of the present application, the processor may be a central processing unit (CPU for short), and the processor may also be other general-purpose processors, digital signal processors (digital signal processor, DSP for short) , application specific integrated circuit (ASIC for short), off-the-shelf programmable gate array (field programmable gate array, FPGA for short) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.

The above-mentioned embodiments may be implemented in whole or in part by software, hardware, firmware or other arbitrary combinations. When implemented using software, the above-described embodiments may be implemented in whole or in part in the form of computer program products. The computer program product comprises one or more computer instructions or computer programs. When the computer instruction or computer program is loaded or executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Wired or wireless transmission to another website site, computer, server or data center.

It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, and should not be used in the embodiments of the present application. The implementation process constitutes any limitation.

In the several embodiments provided in this application, it should be understood that the disclosed methods, devices and systems can be implemented in other ways. For example, the device embodiments described above are only illustrative; for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation; for example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may be physically included separately, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware, or in the form of hardware plus software functional units.

The above-mentioned integrated units implemented in the form of software functional units may be stored in a computer-readable storage medium. The above-mentioned software functional units are stored in a storage medium, and include several instructions to enable a computer device (which may be a personal computer, server, or network device, etc.) to execute some steps of the methods described in various embodiments of the present invention.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention should be based on the scope defined in the claims.

Claims

A cell switching method, characterized in that, comprising:

Acquiring handover execution conditions of each candidate cell, where the types of handover execution conditions include non-DAPS handover execution conditions and/or DAPS handover execution conditions;

judging whether the candidate cell satisfies the handover execution condition;

If there is a first candidate cell satisfying the non-DAPS handover execution condition and a second candidate cell satisfying the DAPS handover execution condition, perform DAPS handover to the second candidate cell.
The cell handover method according to claim 1, wherein the performing DAPS handover to the second candidate cell comprises:

If there are multiple second candidate cells, randomly select one second candidate cell from the multiple second candidate cells to perform DAPS handover.
The cell handover method according to claim 1, wherein said obtaining handover execution conditions of each candidate cell comprises:

A handover command is acquired, where the handover command includes handover execution conditions of one or more candidate cells.
The cell handover method according to claim 1, wherein the DAPS handover execution conditions include a first condition and a second condition, the first condition indicates the requirement for the signal quality of the candidate cell, and the second condition indicates Requirements for the signal quality of the serving cell.
The cell switching method according to claim 4, wherein the first condition includes measurement event A3 and/or measurement event A5 and/or measurement event A4, and the second condition includes measurement event A1; or, the The first condition includes the measurement event A3 and/or the measurement event A5 and/or the measurement event A4, and the second condition includes the timer T310 not running.
A switching configuration method, characterized in that, comprising:

Configure handover execution conditions for each candidate cell, where the type of handover execution conditions includes non-DAPS handover execution conditions and/or DAPS handover execution conditions;

Sending handover execution conditions of each candidate cell, where the handover execution conditions are used to perform handover to the second candidate cell when there is a first candidate cell that satisfies the non-DAPS handover execution condition and a second candidate cell that satisfies the DAPS handover execution condition. DAPS switch.
The handover configuration method according to claim 6, wherein the handover execution conditions for sending each candidate cell include:

Sending a handover command, where the handover command includes handover execution conditions of one or more candidate cells.
A cell handover device, characterized in that it comprises:

An acquisition module, configured to acquire handover execution conditions of each candidate cell, where the types of handover execution conditions include non-DAPS handover execution conditions and/or DAPS handover execution conditions;

A judging module, configured to judge whether the candidate cell satisfies the handover execution condition;

A handover module, configured to perform DAPS handover to the second candidate cell if there is a first candidate cell meeting the non-DAPS handover execution condition and a second candidate cell meeting the DAPS handover execution condition.
A switching configuration device, characterized in that it comprises:

A configuration module, configured to configure handover execution conditions of each candidate cell, where the type of handover execution conditions includes non-DAPS handover execution conditions and/or DAPS handover execution conditions;

A sending module, configured to send handover execution conditions of each candidate cell, and the handover execution condition is used to send to the The second candidate cell performs DAPS handover.
A computer-readable storage medium, on which a computer program is stored, characterized in that, when the computer program is run by a processor, it executes the steps of the cell switching method in any one of claims 1 to 5, or executes the steps of the claim Steps in the switching configuration method described in 6 or 7.
A user equipment, comprising a memory and a processor, the memory stores a computer program that can run on the processor, wherein the processor executes the computer program in claims 1 to 5 when running the computer program Steps in any one of the cell handover methods.
A network device, comprising a memory and a processor, the memory stores a computer program that can run on the processor, and it is characterized in that, when the processor runs the computer program, the computer program described in claim 6 or 7 is executed. Describe the steps of switching the configuration method.