CN104581810B

CN104581810B - A kind of switching method based on carrier wave polymerization polymerize switching method and apparatus between plate

Info

Publication number: CN104581810B
Application number: CN201410770604.4A
Authority: CN
Inventors: 崔哲芳; 马赛
Original assignee: Beijing Northern Fiberhome Technologies Co Ltd
Current assignee: CICT Mobile Communication Technology Co Ltd
Priority date: 2014-12-12
Filing date: 2014-12-12
Publication date: 2018-10-16
Anticipated expiration: 2034-12-12
Also published as: CN104581810A

Abstract

The present invention, which provides, polymerize switching method and apparatus between a kind of switching method polymerizeing based on carrier wave, plate, method includes the measurement report for receiving UE and reporting；According to measurement report, candidate list is generated；Judge whether purpose main plot meets switching and require；When purpose main plot, which meets switching, to be required, switching request message is sent to purpose base station；Receive the switching request acknowledgement message that purpose base station is sent；Switching command is sent to UE, the switching command includes the configuration information of the configuration information of purpose main plot and the polymerization secondary cell of configuration successful, so that UE, after receiving switching command, the configuration information of the polymerization secondary cell of the configuration information and configuration successful according to purpose main plot reconfigures new purpose main plot and polymerization secondary cell.Therefore, the switching that a UE is communicated with multiple Zones simultaneously is supported in the handoff technique provided by the invention for supporting carrier wave polymerization, the carrier wave polymerization in the handoff technique.

Description

Switching method based on carrier aggregation, and inter-board aggregation switching method and device

Technical Field

The present invention relates to the field of mobile communications technologies, and in particular, to a handover method based on carrier aggregation, and an inter-board aggregation handover method and apparatus.

Background

The LTE (Long Term Evolution) system refers to an Evolution scheme adopted to guarantee the competitiveness of 3GPP for a Long Term. Based on WCDMA (wideband Code Division Multiple Access), the system complexity is reduced by changing the network architecture and adopting a new air interface technology, and the system cooperates with different systems.

The carrier aggregation technology is to aggregate discrete Spectrum segments (Spectrum fragments) with channel capacity difficult to support high bandwidth demand services into a complete Spectrum with larger channel capacity, so as to support higher system bandwidth and improve Spectrum utilization rate.

In the existing LTE system carrier aggregation handover process, the handover procedure is only applicable to one carrier (or called cell), that is, in the prior art, the handover process of the LTE system is only performed for a single cell, and does not support handover of service communication between one UE (User Equipment) and multiple cells at the same time.

Disclosure of Invention

In view of this, the present invention provides a handover method based on carrier aggregation, an inter-board aggregation handover method and an inter-board aggregation handover device, so as to solve the problem that in the prior art, handover of one UE and service communication of multiple cells at the same time is not supported. The technical scheme is as follows:

based on one aspect of the present invention, the present invention provides a handover method based on carrier aggregation, including:

receiving a measurement report reported by User Equipment (UE), wherein the measurement report comprises source main cell information, source auxiliary cell information, neighboring cell information of a source main cell and neighboring cell information of a source auxiliary cell;

generating a candidate cell list according to the measurement report;

judging whether the target main cell meets the switching requirement or not;

when the target main cell meets the switching requirement, sending a switching request message to a target base station, wherein the switching request message comprises a source main cell identifier, a target main cell identifier, a UE identifier and the candidate cell list;

receiving a switching request confirmation message sent by the target base station, wherein the switching request confirmation message comprises configuration information of a target main cell and configuration information of an aggregation auxiliary cell which is configured successfully;

and sending a switching command to the UE, wherein the switching command comprises configuration information of a target main cell and configuration information of a successfully configured aggregation auxiliary cell, so that the UE reconfigures new target main cells and new aggregation auxiliary cells according to the configuration information of the target main cell and the configuration information of the successfully configured aggregation auxiliary cell after receiving the switching command.

Preferably, the generating a candidate cell list according to the measurement report includes:

arranging all cells in the measurement report in a descending order according to signal quality to generate a cell list, wherein the signal quality comprises Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ);

deleting cells which do not belong to the target base station in the cell list;

deleting the cells with the frequency point signals which are not the best in the cells with the same frequency point in the cell list;

and determining a cell list after deleting cells which do not belong to the target base station and deleting cells with the same frequency points, wherein the frequency point signals of the cells are not the best cells, as a candidate cell list.

Preferably, the handover request message further includes: aggregating secondary cell information in a source base station;

wherein the handover request confirm message further includes reconfiguration information of an aggregated secondary cell in the source base station; the switching command also comprises reconfiguration information of an aggregation secondary cell in the source base station;

and the reconfiguration information of the aggregation auxiliary cell in the source base station is used for releasing the information of the aggregation auxiliary cell in the source base station according to the reconfiguration information of the aggregation auxiliary cell in the source base station after the UE receives the reconfiguration information of the aggregation auxiliary cell in the source base station.

Preferably, after the sending of the handover command to the UE, the method further includes:

judging whether a switching completion message sent by the target base station is received within a first preset time;

if the switching completion message is received within a first preset time, releasing the primary cell information and the secondary cell information of the source base station;

and if the switching completion message is not received within the first preset time, releasing the configuration information of the auxiliary cell in the source base station, and controlling the UE to report the measurement report again.

Based on another aspect of the present invention, the present invention further provides a handover method based on carrier aggregation, including:

receiving a switching request message sent by a source base station, wherein the switching request message comprises a source main cell identifier, a target main cell identifier, a User Equipment (UE) identifier and the candidate cell list;

judging whether the target main cell meets the switching requirement or not according to the target main cell identifier;

when the target main cell meets the switching requirement, determining an aggregation auxiliary cell according to the candidate cell list;

configuring the target primary cell;

after the configuration of the target primary cell is completed, sequentially configuring the aggregation secondary cells;

after the configuration of the aggregation secondary cell is completed, sending a switching request confirmation message to the source base station, wherein the switching request confirmation message comprises the configuration information of the target main cell and the configuration information of the aggregation secondary cell which is successfully configured;

and receiving a switching completion message sent by the UE, activating the successfully configured aggregation secondary cell, and forwarding the switching completion message to the source base station.

wherein the handover request confirm message further includes reconfiguration information of an aggregated secondary cell in the source base station;

Preferably, the determining the aggregated secondary cell according to the candidate cell list includes:

deleting the cells which do not support carrier aggregation and/or have high load in the candidate cell list;

and selecting the rest cells in the candidate cell list from high to low to aggregate secondary cells according to signal quality, wherein the signal quality comprises Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ).

Preferably, the number of the aggregation secondary cells is less than or equal to the number of the aggregation secondary cells in the source base station.

Preferably, after the configuration of the aggregation secondary cell is completed, the method further includes:

judging whether the confirmation information of the aggregation secondary cell is received within second preset time;

when the confirmation information of the aggregation secondary cell is received within second preset time, determining that the configuration of the aggregation secondary cell is successful;

when the confirmation information of the aggregation secondary cell is not received within second preset time, determining that the configuration of the aggregation secondary cell fails, releasing the information of the aggregation secondary cell with the failed configuration, and deleting the aggregation secondary cell with the failed configuration from the candidate cell list;

and determining a candidate cell list formed by the successfully configured aggregated secondary cells after deleting the unsuccessfully configured aggregated secondary cells as a final candidate cell list.

Based on still another aspect of the present invention, the present invention further provides an inter-board aggregation handover method based on carrier aggregation, including:

a source base station receives a measurement report reported by User Equipment (UE), wherein the measurement report comprises source main cell information, source auxiliary cell information, neighboring cell information of a source main cell and neighboring cell information of a source auxiliary cell;

the source base station generates a candidate cell list according to the measurement report;

the source base station judges the obtained UE switching type according to the RRM information of the wireless resource management and the RRM, acquires the information of the target main cell and judges whether the target main cell meets the switching requirement;

when the target main cell meets the switching requirement, the source base station sends a switching request message to the target base station, wherein the switching request message comprises a source main cell identifier, a target main cell identifier, a UE identifier and the candidate cell list;

after receiving the handover request message, the target base station sends the handover request message to a control plane CC;

the control plane CC sends the target main cell identification, the UE identification and the configuration information of the channel to be accessed to a media access MAC layer of a main cell according to the switching request message, so that the MAC layer performs resource check on the switching request message sent by the source base station, allocates a new Radio Network Temporary Identification (RNTI) for the target main cell and performs local configuration on the target main cell;

the control plane CC respectively configures a packet data convergence protocol PDCP layer, an MAC layer and a physical layer PHY, and configures a GPRS tunneling protocol GTP forwarding tunnel;

the control plane CC sends the identification information of the target main cell to the aggregation auxiliary cell of each single board through an uplink interface and a downlink interface; the identification information of the target primary cell includes bearer information and/or link information of the target primary cell, so as to facilitate communication between the primary and secondary cells among the boards;

after the control plane CC completes each configuration, the target base station sends a handover request acknowledgement message to the source base station, where the handover request acknowledgement message includes configuration information of a target primary cell and configuration information of an aggregation secondary cell that is successfully configured;

and the source base station receives a switching request confirmation message sent by the target base station and sends a switching command to the UE, wherein the switching command comprises configuration information of a target main cell and configuration information of a successfully configured aggregation auxiliary cell, so that the UE reconfigures a new target main cell and a new aggregation auxiliary cell according to the configuration information of the target main cell and the configuration information of the successfully configured aggregation auxiliary cell after receiving the switching command.

Based on still another aspect of the present invention, the present invention further provides a switching apparatus based on carrier aggregation, including:

the first receiving unit is used for receiving a measurement report reported by User Equipment (UE), wherein the measurement report comprises source main cell information, source auxiliary cell information, neighbor cell information of a source main cell and neighbor cell information of a source auxiliary cell;

a candidate cell list generating unit, configured to generate a candidate cell list according to the measurement report;

a first judging unit, configured to judge whether the target primary cell meets a handover requirement;

a first sending unit, configured to send a handover request message to a target base station when the first determining unit determines that a target primary cell meets a handover requirement, where the handover request message includes a source primary cell identifier, a target primary cell identifier, a UE identifier, and the candidate cell list;

a second receiving unit, configured to receive a handover request acknowledgement message sent by the destination base station, where the handover request acknowledgement message includes configuration information of the destination primary cell and configuration information of the successfully configured aggregation secondary cell;

a second sending unit, configured to send a handover command to the UE, where the handover command includes configuration information of a target primary cell and configuration information of a successfully configured aggregation secondary cell, so that after receiving the handover command, the UE reconfigures new target primary cells and aggregation secondary cells according to the configuration information of the target primary cell and the configuration information of the successfully configured aggregation secondary cell.

Preferably, the candidate cell list generating unit includes:

a cell list generating subunit, configured to arrange all cells in the measurement report in a descending order according to signal quality, and generate a cell list, where the signal quality includes reference signal received power RSRP or reference signal received quality RSRQ;

a first deleting subunit, configured to delete cells in the cell list that do not belong to the target base station;

a second deleting subunit, configured to delete a cell in which a frequency point signal in a cell with the same frequency point in the cell list is not the best;

and the determining subunit is used for determining that a cell list after deleting the cell which does not belong to the target base station and deleting the cell with the frequency point signal which is not the best in the cells with the same frequency point is a candidate cell list.

Preferably, the second determining unit is configured to determine whether a handover complete message sent by the target base station is received within a first preset time;

an information releasing unit, configured to release the primary cell information and the secondary cell information of the source base station when the second determining unit determines that the handover completion message is received within a first preset time; and releasing the configuration information of the auxiliary cell in the source base station and controlling the UE to report the measurement report again when the switching completion message is not received within the first preset time.

a third receiving unit, configured to receive a handover request message sent by a source base station, where the handover request message includes a source primary cell identifier, a destination primary cell identifier, a UE identifier, and the candidate cell list;

a third determining unit, configured to determine whether the target primary cell meets a handover requirement according to the target primary cell identifier;

an aggregation secondary cell determining unit, configured to determine an aggregation secondary cell according to the candidate cell list when the third determining unit determines that the target primary cell meets the handover requirement;

a first configuration unit, configured to configure the target primary cell;

a second configuration unit, configured to sequentially configure the aggregation secondary cells after the first configuration unit completes configuration of the target primary cell;

a third sending unit, configured to send a handover request acknowledgement message to the source base station after the second configuration unit completes configuration of the aggregation secondary cell, where the handover request acknowledgement message includes configuration information of the target primary cell and configuration information of the aggregation secondary cell that is successfully configured;

a fourth receiving unit, configured to receive a handover completion message sent by the UE, activate the successfully configured aggregated secondary cell, and forward the handover completion message to the source base station.

Preferably, the aggregation secondary cell determining unit includes:

a third deleting subunit, configured to delete a cell that does not support carrier aggregation and/or has a high load in the candidate cell list;

and the selecting subunit is used for selecting the aggregated secondary cells from the rest cells in the candidate cell list according to the signal quality from high to low, wherein the signal quality comprises Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ).

Preferably, the method further comprises the following steps:

a fourth determining unit, configured to determine whether the acknowledgement information of the aggregated secondary cell is received within a second preset time;

a determining unit, configured to determine that the configuration of the aggregation secondary cell is successful when the fourth determining unit determines that the confirmation information of the aggregation secondary cell is received within a second preset time; when the confirmation information of the aggregation secondary cell is not received within second preset time, determining that the configuration of the aggregation secondary cell fails, releasing the information of the aggregation secondary cell with the failed configuration, and deleting the aggregation secondary cell with the failed configuration from the candidate cell list; and determining a candidate cell list formed by the successfully configured aggregated secondary cells after deleting the unsuccessfully configured aggregated secondary cells as a final candidate cell list.

By applying the technical scheme of the invention, in the switching method based on carrier aggregation provided by the invention, after the source base station receives the measurement report reported by the UE, a candidate cell list is generated according to the measurement report, and whether the target main cell meets the switching requirement is further judged. And when the target main cell meets the switching requirement, sending a switching request message to the target base station, wherein the switching request message comprises a source main cell identifier, a target main cell identifier, a UE identifier and the candidate cell list. And when the target base station completes the configuration of the target main cell and the aggregation auxiliary cell according to the switching request message sent by the source base station, and generates configuration information, the switching request confirmation message is sent to the source base station, and the source base station sends a switching command comprising the configuration information of the target main cell and the configuration information of the aggregation auxiliary cell which is successfully configured to the UE, so that the UE can configure the new target main cell and the new aggregation auxiliary cell. Therefore, the present invention provides a handover technique supporting carrier aggregation, in which carrier aggregation supports handover of one UE communicating with multiple cell services at the same time.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a flowchart of a handover method based on carrier aggregation according to the present invention;

fig. 1a is another flowchart of a handover method based on carrier aggregation according to the present invention;

fig. 2 is a flowchart of a handover method based on carrier aggregation according to another embodiment of the present invention;

fig. 3 is a flowchart of a handover method based on carrier aggregation according to another embodiment of the present invention;

fig. 3a is a flowchart of a handover method based on carrier aggregation according to another embodiment of the present invention;

fig. 4 is a flowchart of a handover method based on carrier aggregation according to another embodiment of the present invention;

fig. 5 is a flowchart of a handover method based on carrier aggregation according to another embodiment of the present invention;

FIG. 6 is a schematic diagram of a base station according to the present invention;

FIG. 7 is a schematic data flow diagram of interplate aggregation in the present invention;

fig. 8 is a flowchart of a handover method based on carrier aggregation according to another embodiment of the present invention;

fig. 9 is a schematic structural diagram of a switching apparatus based on carrier aggregation according to the present invention;

fig. 10 is a schematic structural diagram of a candidate cell list generating unit in a handover apparatus based on carrier aggregation according to the present invention;

fig. 11 is a schematic structural diagram of a switching apparatus based on carrier aggregation according to another embodiment of the present invention;

fig. 12 is a schematic structural diagram of an aggregation secondary cell determining unit in a handover device based on carrier aggregation according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Referring to fig. 1, it shows a flowchart of a handover method based on carrier aggregation according to the present invention, where the method is applied to a source base station, and specifically includes:

step 101, a source base station receives a measurement report reported by a User Equipment (UE). The measurement report comprises source main cell information, source auxiliary cell information, neighbor cell information of the source main cell and neighbor cell information of the source auxiliary cell.

And 102, the source base station generates a candidate cell list according to the measurement report.

The measurement report includes information of all cells measured by the UE, such as source primary cell information, source secondary cell information, neighbor cell information of the source primary cell, and neighbor cell information of the source secondary cell. Specifically, as shown in fig. 1a, step 102 may include:

step 1021, arranging all cells in the measurement report according to the descending order of the signal quality, and generating a cell list. The Signal quality includes RSRP (Reference Signal Receiving Power) or RSRQ (Reference Signal Receiving quality).

Firstly, the source base station in the invention arranges all the cells measured by the UE in a descending order according to the signal quality of the cells to generate a cell list.

And step 1022, deleting cells which do not belong to the target base station in the cell list.

The ECGI (E-UTRAN Cell Global Identifier ) of the Cell has 28 bits in total, and the first 20 bits are the ID (identity, identity number) of the base station to which the Cell belongs, so that the source base station can determine whether the Cell belongs to the destination base station according to the ID information by querying the ECGI of the Cell. When the cell is judged not to belong to the destination base station, it is deleted from the list.

And step 1023, deleting the cells with the same frequency points in the cell list, wherein the frequency point signals in the cells are not the best cells.

The quality of the frequency point signals can be based on the signal quality of the cell, and when the signal quality of the cell is high, the frequency point signals are good, and when the signal quality of the cell is low, the frequency point signals are not good.

The carrier aggregation technology is to spread a plurality of discrete frequency spectrums into wider frequency spectrums to transmit data, aggregated frequency points are different, but cells with the same frequency point exist in a base station.

The inventor should note that, in the present invention, the order of step 1022 and step 1023 is not limited, and step 1023 may be executed first, step 1022 is executed, or step 1022 and step 1023 are executed at the same time.

Step 1024, determining a cell list after deleting cells not belonging to the target base station and deleting cells with the same frequency points in which the frequency point signals are not the best as a candidate cell list.

Therefore, after the processing in step 1022 and step 1023, the remaining cells on the cell list are the cells which belong to the target base station and have the best frequency point signals in the cells with the same frequency point. At this time, the processed cell list is determined to be a candidate cell list.

Specifically, the implementation form of the candidate cell list is shown in table 1 below:

TABLE 1

CellID

PCI

Frequency point

RSRP

RSRQ

ECGI

The candidate Cell list includes parameter information such as PCI (physical-layer Cell identity), frequency point, RSRP/RSRQ, ECGI (E-UTRAN Cell Global Identifier), and the like of each Cell.

Step 103, the source base station determines whether the target primary cell meets the handover requirement. And when the target primary cell meets the switching requirement, executing the step 104, otherwise, returning to the step 101.

The target main cell is a cell for triggering the UE to report the measurement report, and the measurement report is the result of the last measurement report of the UE before the source base station is triggered to switch.

Specifically, the determining whether the target primary cell meets the handover requirement may specifically be determining whether the signal quality of the target primary cell meets the handover requirement.

Step 104, the source base station sends a switching request message to the target base station. The switching request message comprises a source main cell identification, a target main cell identification, a UE identification and a candidate cell list.

In this embodiment, it is preferable that the handover request message further includes aggregated secondary cell information in the source base station. And the information of the aggregated auxiliary cells in the source base station is used for informing the resource occupation condition of the target base station UE in the source base station.

And 105, the source base station receives a switching request confirmation message sent by the target base station. The handover request acknowledgement message includes configuration information of the target primary cell and configuration information of the successfully configured aggregated secondary cell.

In an actual application process, step 105 may specifically be that the source base station receives a handover request acknowledgement message sent by the destination base station at a preset time. The preset time can be defined according to actual conditions. And when the source base station does not receive the switching request confirmation message sent by the target base station in the preset time, returning to the step 101, and the source base station waits for re-receiving the measurement report reported by the UE and re-initiates the switching process.

In addition, the invention is better, the switching request confirmation message can also comprise the reconfiguration information of the aggregation secondary cell in the source base station.

In the invention, the UE releases the resources of the aggregated secondary cell in the source base station by issuing reconfiguration information by the source base station. However, the reconfiguration information needs to be obtained by refilling through the destination base station, so that when the handover request message includes the aggregation secondary cell information in the source base station, the destination base station may refill the reconfiguration information of the aggregation secondary cell in the source base station according to the aggregation secondary cell information in the source base station, so as to release the aggregation secondary cell resource in the source base station by the UE.

Step 106, the source base station sends a handover command to the UE. The switching command comprises configuration information of the target primary cell and configuration information of the aggregation secondary cell which is configured successfully.

Specifically, the sending mode of the source base station sending the switching command to the UE in the present invention may be a transparent transmission mode.

In the invention, after receiving the switching command, the UE reads the configuration information of the target main cell and the configuration information of the successfully configured aggregation auxiliary cell in the switching command, and then reconfigures the new target main cell and the new aggregation auxiliary cell according to the configuration information of the target main cell and the configuration information of the successfully configured aggregation auxiliary cell so as to establish communication connection with the target base station.

Preferably, the handover command in the present invention may further include reconfiguration information of the aggregated secondary cell in the source base station. And after receiving the reconfiguration information of the aggregated auxiliary cell in the source base station, the UE releases the auxiliary cell information in the source base station according to the reconfiguration information.

Therefore, by applying the technical scheme of the present invention, in the switching method based on carrier aggregation provided by the present invention, after the source base station receives the measurement report reported by the UE, a candidate cell list is generated according to the measurement report, and further, whether the target primary cell meets the switching requirement is judged. And when the target main cell meets the switching requirement, sending a switching request message to the target base station, wherein the switching request message comprises a source main cell identifier, a target main cell identifier, a UE identifier and the candidate cell list. And when the target base station completes the configuration of the target main cell and the aggregation auxiliary cell according to the switching request message sent by the source base station, and generates configuration information, the switching request confirmation message is sent to the source base station, and the source base station sends a switching command comprising the configuration information of the target main cell and the configuration information of the aggregation auxiliary cell which is successfully configured to the UE, so that the UE configures the new target main cell and the new aggregation auxiliary cell, and the communication connection with the target base station is established. Therefore, the present invention provides a handover technique supporting carrier aggregation, in which carrier aggregation supports handover of one UE communicating with multiple cell services at the same time.

Example two

On the basis of the foregoing embodiment, as shown in fig. 2, another flowchart of a handover method based on carrier aggregation according to the present invention is shown, where after the source base station sends a handover command to the UE, the method further includes:

in step 201, the source base station determines whether a handover complete message sent by the destination base station is received within a first preset time. If so, step 202 is performed, and if not, step 203 is performed.

The first preset time can be flexibly set according to actual needs.

Specifically, step 201 may include starting a timer after the source base station sends the handover command to the UE. And timing and judging whether the first preset time is reached or not through a timer.

Step 202, releasing the primary cell information and the secondary cell information of the source base station.

Step 203, releasing the configuration information of the secondary cell in the source base station, and controlling the UE to report the measurement report again.

In the invention, after the UE completes reconfiguration, the UE reports a switching completion message to the target base station, and after receiving the switching completion message reported by the UE, the target base station forwards the switching completion message to the source base station to inform the source base station that the UE completes reconfiguration. Therefore, when the source base station receives a handover completion message sent by the target base station in a first preset time, which indicates that the UE is successfully handed over to the target base station, the primary cell information and the secondary cell information of the source base station are released at this time to save system resources of the source base station, and if the source base station does not receive the handover completion message sent by the target base station in the first preset time, the source base station confirms that a problem occurs in the process of handing over the UE to the target base station, and the UE cannot be handed over to the target base station, and at this time, the source base station actively terminates the handover process, releases configuration information of the secondary cell in the source base station, and controls the UE to report a measurement report again to restart the handover process.

Meanwhile, in the invention, when the UE does not complete the reconfiguration for some reasons and does not establish the communication connection with the target base station, the invention can also comprise that the UE actively reports the switching failure message to the target base station, at the moment, the target base station forwards the switching failure message to the source base station, and the source base station releases the configuration information of the auxiliary cell in the source base station after receiving the switching failure message.

EXAMPLE III

Please refer to fig. 3, which shows another flowchart of a handover method based on carrier aggregation according to the present invention, where the method is applied to a destination base station, and specifically includes:

step 301, the destination base station receives a handover request message sent by the source base station. The switching request message comprises a source main cell identification, a target main cell identification, a UE identification and a candidate cell list.

Preferably, the handover request message may further include aggregated secondary cell information in the source base station.

Step 302, the destination base station determines whether the destination primary cell meets the handover requirement according to the destination primary cell identifier. If the target primary cell meets the handover requirement, step 303 is executed, otherwise step 308 is executed.

In the practical application process, after the target base station receives the handover request message sent by the source base station, a temporary node is established for resource auditing, and the resource auditing mainly relates to judging whether the parameter information sent by the source base station is legal or not. Before the target base station completes the configuration of the target main cell and the aggregation auxiliary cell, all the parameters sent by the source base station are temporarily stored in the temporary node, and after the target base station completes the configuration of the target main cell and the aggregation auxiliary cell, the parameter information sent by the source base station is stored in a memory of the target base station, and the temporary node is deleted at the same time.

Step 303, the target base station determines the aggregation secondary cell according to the candidate cell list.

The invention selects part or all cells from the candidate cell list sent by the source base station to be determined as the aggregation secondary cell. As shown in fig. 3a, step 303 may include:

step 3031, deleting the cells which do not support carrier aggregation and/or have high load in the candidate cell list.

In this step, the cell that does not support carrier aggregation may be deleted from the candidate cell list first, and the cell with higher load may be deleted first, or the cell with higher load may be deleted from the candidate cell list first, and the cell that does not support carrier aggregation may be deleted.

And step 3032, selecting the aggregated secondary cells from the rest cells in the candidate cell list according to the signal quality from high to low. The Signal quality includes RSRP (Reference Signal Receiving Power) or RSRQ (Reference Signal Receiving quality).

Similarly, the implementation form of the candidate cell list finally determined in this embodiment is also shown in table 1 below:

TABLE 1

CellID

PCI

Frequency point

RSRP

RSRQ

ECGI

In addition, in order to ensure that the service flow keeps the original level after the UE is switched to the target base station and reduce the influence caused by switching, when the aggregation auxiliary cells are determined according to the candidate cell list, the number of the aggregation auxiliary cells is less than or equal to the number of the aggregation auxiliary cells in the source base station. Preferably, in order to ensure normal transmission of the service, the number of the aggregation secondary cells in the destination base station may be selected to be the same as the number n of the aggregation secondary cells in the source base station. After the screening in step 3031, the remaining cells in the candidate cell list are cells that both support carrier aggregation and have low load, and at this time, the n cells with better signal quality in the candidate cell list may be selected as the cells to be aggregated according to the signal quality from high to low. Of course, if the number of cells remaining in the candidate cell list is less than n, all cells in the candidate cell list are determined as aggregation secondary cells to be aggregated.

Step 304, the destination base station configures a destination primary cell.

Specifically, the target base station configuring the target primary cell mainly includes parameter configuration for a local MAC (media access control) layer, a PDCP (Packet Data Convergence Protocol) layer, and a DSP (digital signal processing) layer of the target base station.

And 305, sequentially configuring the aggregation secondary cells by the target base station.

After the configuration of the target primary cell is completed, the configuration requests of the aggregation secondary cells are sent one by one so as to sequentially configure the aggregation secondary cells.

Step 306, the destination base station sends a handover request acknowledge message to the source base station. The handover request acknowledgement message includes configuration information of the target primary cell and configuration information of the successfully configured aggregated secondary cell.

In the practical application process, it cannot be guaranteed that all selected aggregation secondary cells complete configuration normally, and when only part of the aggregation secondary cells complete configuration, only the configuration information of the successfully configured aggregation secondary cells is sent to the source base station, and the aggregation secondary cells with failed configuration are released.

Preferably, the handover request acknowledgement message may further include reconfiguration information of the aggregated secondary cell in the source base station. And the reconfiguration information of the aggregation auxiliary cell in the source base station is used for releasing the information of the aggregation auxiliary cell in the source base station according to the reconfiguration information of the aggregation auxiliary cell in the source base station after the UE receives the reconfiguration information of the aggregation auxiliary cell in the source base station.

Step 307, the destination base station receives the handover complete message sent by the UE, activates the successfully configured aggregated secondary cell, and forwards the handover complete message to the source base station.

Specifically, when the configured aggregation secondary cell is activated, the activation is triggered by the MAC layer, the 3GPP protocol specifies that the aggregation secondary cell is in an inactive state after the establishment of the aggregation secondary cell is completed, and the MAC layer determines when to activate the cell according to the service requirement.

Step 308, the destination base station directly sends a handover reject message to the source base station.

When the target base station judges that the target main cell does not meet the switching requirement, the target base station directly sends a switching refusing message to the source base station so as to inform the source base station that the target main cell does not allow or support switching.

Example four

On the basis of the third embodiment, please refer to fig. 4, which shows another flowchart of a handover method based on carrier aggregation according to the present invention, in this embodiment, after completing configuration of an aggregation secondary cell, the method further includes:

step 401, the destination base station determines whether the acknowledgement information of the aggregation secondary cell is received within a second preset time. If the acknowledgement information of the aggregated secondary cell is received within the second preset time, step 402 is executed, and if the acknowledgement information of the aggregated secondary cell is not received within the second preset time, step 403 is executed.

The second preset time can be flexibly set according to actual needs.

Specifically, step 401 may include starting a timer after the destination base station completes the configuration of the aggregated secondary cell. And timing and judging whether the second preset time is reached or not through a timer.

Step 402, determining that the configuration of the aggregation secondary cell is successful.

Step 403, determining that the aggregation secondary cell configuration fails, releasing the information of the aggregation secondary cell with failed configuration, and deleting the aggregation secondary cell with failed configuration from the candidate cell list.

Step 404, determining that the candidate cell list formed by the successfully configured aggregated secondary cells after deleting the unsuccessfully configured aggregated secondary cells is the final candidate cell list.

The target base station judges which aggregation auxiliary cells are successfully configured and which aggregation auxiliary cells are failed to be configured by judging whether the confirmation information of the aggregation auxiliary cells is received or not within the second preset time. And when the configuration of the aggregation secondary cell is failed, determining that the configuration of the aggregation secondary cell is failed, releasing the information of the aggregation secondary cell with failed configuration, and deleting the aggregation secondary cell with failed configuration from the candidate cell list. At this time, after deleting the aggregation secondary cells with failed configuration, the candidate cell list formed by the aggregation secondary cells with successful configuration is determined as a final candidate cell list. And when all the aggregated secondary cells fail to be configured, the target base station only sends the configuration information of the target primary cell to the source base station.

EXAMPLE five

In order to more clearly describe the technical solution of the present invention, the inventor now elaborates in detail a process of information interaction among a source base station, a destination base station, and a UE, as shown in fig. 5, including:

step 501, a source base station receives a measurement report reported by a UE.

Step 502, the source base station generates a candidate cell list according to the measurement report.

In step 503, the source base station determines whether the target primary cell meets the handover requirement. And when the target primary cell meets the switching requirement, executing step 504, otherwise, returning to step 501.

Step 504, the source base station sends a handover request message to the destination base station. The switching request message comprises a source main cell identification, a target main cell identification, a UE identification, a candidate cell list and aggregated auxiliary cell information in a source base station.

Step 505, the destination base station receives the handover request message sent by the source base station.

Step 506, the destination base station determines whether the destination primary cell meets the handover requirement according to the destination primary cell identifier. If the target primary cell meets the handover requirement, step 507 is executed, otherwise step 517 is executed.

And step 507, the target base station determines the aggregation secondary cell according to the candidate cell list.

Step 508, the destination base station configures the destination primary cell.

In step 509, the target base station sequentially configures the aggregation secondary cells.

Step 510, the destination base station sends a handover request acknowledgement message to the source base station. The handover request acknowledgement message includes configuration information of the target primary cell, configuration information of the successfully configured aggregation secondary cell, and reconfiguration information of the aggregation secondary cell in the source base station.

In step 511, the source base station receives the handover request acknowledge message sent by the destination base station.

In step 512, the source base station sends a handover command to the UE. The switching command comprises configuration information of the target main cell, configuration information of the successfully configured aggregation secondary cell and reconfiguration information of the aggregation secondary cell in the source base station.

Step 513, the UE reconfigures the new target primary cell and the aggregation secondary cell according to the configuration information of the target primary cell and the configuration information of the aggregation secondary cell that is successfully configured, and releases the secondary cell information in the source base station according to the reconfiguration information of the aggregation secondary cell in the source base station.

In step 514, the UE sends a handover complete message to the destination base station.

Step 515, the destination base station receives the handover complete message sent by the UE, activates the successfully configured aggregated secondary cell, and forwards the handover complete message to the source base station.

In step 516, the source base station receives the handover complete message, and releases the primary cell information and the secondary cell information of the source base station.

Step 517, the target base station directly sends the handover reject message to the source base station.

Step 518, the source base station receives the handover reject message, releases the configuration information of the secondary cell in the source base station, and controls the UE to report the measurement report again.

In the practical application process, the carrier aggregation switching method of the LTE system includes intra-LTE system switching and switching between the LTE system and a different system. The intra-LTE system handover comprises intra-base station handover and inter-base station handover, and the inter-base station handover further comprises inter-base station handover connected through an X2 interface, inter-base station handover connected through an S1 interface and the like. The handover procedure described in the foregoing embodiment of the present invention mainly relates to a handover procedure between base stations, and similarly, the handover procedure in the base station is similar to the implementation manner of the handover procedure between base stations provided in the foregoing embodiment of the present invention.

As shown in fig. 6, it shows a schematic structural diagram of a base station in the present invention. Specifically, the base station includes three single Boards (BPUs) and one CCU. One BPU can establish up to four cells. The implementation scheme described above relates to cell aggregation on the same BPU, and traffic scheduling between aggregated cells is performed by the primary cell. When the aggregated cells are on the same BPU board, the service allocation and scheduling of each cell can be transmitted in real time through the internal interface. However, if the aggregated secondary cell and the primary cell are not on the same BPU, the information of service scheduling needs to be completed by a relevant interface and identifier between the BPUs, and the service information to be transmitted needs to be transmitted through a high-speed channel between the plates.

In this embodiment, the present invention provides that all traffic information is scheduled by the MAC layer of the primary cell through the primary cell, as shown in fig. 7. Therefore, when configuring the control plane CC module, the invention needs to respectively send the configuration information of the main cell to the auxiliary cells among different boards, thereby facilitating the service scheduling and communication of the main cell to the auxiliary cells in other boards.

Therefore, based on the foregoing, in the present invention, after receiving the measurement report reported by the UE, the source base station may further include: and the source base station judges the switching type of the UE. The handover types include X2 handover, intra-base station handover, S1 handover, secondary cell handover, and the like. And after the source base station determines the switching type of the UE, the switching type is carried in a switching request message and is sent to the target base station, so that the target base station executes corresponding processing operation according to the switching type.

For the destination base station, after the destination base station receives the handover request message sent by the source base station, the destination base station sends the handover request message to the control plane CC, the control plane CC sends the destination primary cell identifier, the UE identifier and the configuration information of the channel to be accessed to the MAC layer of the destination primary cell, and the MAC layer performs resource check and allocates a new RNTI to perform local E-RAB configuration. After the auditing is completed, the control plane CC configures PDCP, MAC, and PHY (physical layer), and configures a GTP (GPRS tunneling Protocol) forwarding tunnel. The control plane CC also sends the relevant identifier of the target primary cell, including the information of the load of the target primary cell, the link, etc., to the secondary cells of each board through the uplink and downlink interfaces, which facilitates the communication between the primary and secondary cells among different boards.

Specifically, as shown in fig. 8, it shows another flowchart of a handover method based on carrier aggregation according to the present invention;

step 601, an RRC (Radio Resource Control, Radio Resource Control protocol) in the source base station issues measurement Control information to the UE. The measurement range of the UE includes all the serving cells and the neighboring cells of the serving cells.

Step 602, the UE performs measurement and reports a measurement report to the source base station.

Step 603, the source base station receives the measurement report and generates a candidate cell list according to the measurement report. Meanwhile, RRM (Radio Resource Management) in the source base station determines the handover type of the UE.

Specifically, in this embodiment, it is determined that the handover type of the UE is the handover of the primary cell in the base station, and then information of the target primary cell is searched, and it is determined whether the target primary cell belongs to the cell in the target base station.

The inventor should note that, in this embodiment, the implementation manner of generating the candidate cell list by the source base station according to the measurement report is similar to that in the foregoing embodiment, and the difference is that the flows of the source base station and the destination base station are all performed at the same stage.

Step 604, the source base station obtains the information of the target primary cell according to the RRM information and the UE handover type determined by the RRM, and determines whether the target primary cell meets the handover requirement. And when the target primary cell meets the switching requirement, executing the step 605, otherwise, returning to the step 601.

Step 605, the source base station sends a handover request message to the destination base station. The switching request message comprises a source main cell identification, a target main cell identification, a UE identification, a candidate cell list and aggregated auxiliary cell information in a source base station.

Step 606, the destination base station receives the handover request message sent by the source base station.

Step 607, the control plane CC in the destination base station performs information interaction with the MAC layer of the destination primary cell, allocates a new RNTI for the destination primary cell, and simultaneously performs local configuration on the destination primary cell. In addition, the control plane CC also sends an SN status request message to the source primary cell, requesting to acquire the SN status of the source primary cell.

In step 608, after receiving the SN status request message, the source primary cell sends an SN status response message of the source primary cell to the control plane CC. The SN status response message is used for representing the SN status of the current source primary cell.

Step 609, after receiving the SN status response message, the control plane CC sends an RRC reconfiguration message to the UE. The reconfiguration message includes new primary cell information, new secondary cell information and information of the secondary cell to be deleted. And then sends an SN status request message to the destination primary cell.

Step 610, the destination primary cell completes the local SN and HFN configuration according to the SN status request message, and returns a configuration confirmation message to the control plane CC. The destination primary cell may buffer the UE uplink and downlink data from the source primary cell.

Step 611, the control plane CC sends a tunnel configuration modification request message to the GTP, configures the forwarding tunnel from the source primary cell to the destination primary cell, and configures the GTP forwarding tunnel. And the GTP forwards the tunnel according to the request message and returns a tunnel forwarding confirmation message.

Step 612, the control plane CC sends an uplink and downlink data forwarding request to the source main cell, and the source main cell forwards the uplink and downlink data to the destination main cell and returns an uplink and downlink data forwarding response message.

Step 613, the target primary cell will buffer the data from the source primary cell until receiving the RRC connection reconfiguration complete message of the UE, and then start forwarding the uplink and downlink data to the target primary cell.

And step 614, after receiving the uplink and downlink data sending response, the control plane CC sends an EndMarker identifier to the target main cell.

Step 615, after receiving the EndMarker ID, the target main cell returns an instruction of deleting the forwarding tunnel, the GTP deletes the uplink and downlink forwarding tunnels of the source main cell and the target main cell, and the source base station deletes all resources of the UE in the source main cell.

EXAMPLE six

Based on the foregoing text, the present invention provides a switching method based on carrier aggregation, and the present invention further provides a switching apparatus based on carrier aggregation, as shown in fig. 9, including: first receiving section 100, candidate cell list generating section 200, first determining section 300, first transmitting section 400, second receiving section 500, and second transmitting section 600. Wherein,

a first receiving unit 100 is configured to receive a measurement report reported by a UE. The measurement report includes source main cell information, source auxiliary cell information, neighbor cell information of the source main cell and neighbor cell information of the source auxiliary cell.

A candidate cell list generating unit 200, configured to generate a candidate cell list according to the measurement report.

A first determining unit 300, configured to determine whether the target primary cell meets the handover requirement.

A first sending unit 400, configured to send a handover request message to the destination base station when the first determining unit 300 determines that the destination primary cell meets the handover requirement. The switching request message comprises a source main cell identification, a target main cell identification, a UE identification and the candidate cell list.

A second receiving unit 500, configured to receive a handover request acknowledge message sent by the destination base station. The switching request confirmation message comprises configuration information of the target primary cell and configuration information of the aggregation secondary cell which is configured successfully.

A second sending unit 600, configured to send a handover command to the UE. The switching command comprises configuration information of the target primary cell and configuration information of the successfully configured aggregation secondary cell, so that after the UE receives the switching command, the UE reconfigures the new target primary cell and the new aggregation secondary cell according to the configuration information of the target primary cell and the configuration information of the successfully configured aggregation secondary cell.

Preferably, as shown in fig. 10, the candidate cell list generating unit 200 further includes:

a cell list generating subunit 201, configured to arrange all cells in the measurement report in a descending order according to signal quality, and generate a cell list, where the signal quality includes reference signal received power RSRP or reference signal received quality RSRQ;

a first deleting subunit 202, configured to delete cells in the cell list that do not belong to the destination base station;

a second deleting subunit 203, configured to delete a cell in which a frequency point signal in a cell with the same frequency point in the cell list is not the best cell;

a determining subunit 204, configured to determine, as a candidate cell list, a cell list after deleting a cell that does not belong to the target base station and deleting a cell with the same frequency point in which a frequency point signal is not the best.

In addition, the present invention may further include a second judgment unit 700 and an information release unit 800. In particular, the amount of the solvent to be used,

a second determining unit 700, configured to determine whether a handover complete message sent by the target base station is received within a first preset time;

an information releasing unit 800, configured to release the primary cell information and the secondary cell information of the source base station when the second determining unit 700 determines that the handover completion message is received within a first preset time; and releasing the configuration information of the auxiliary cell in the source base station and controlling the UE to report the measurement report again when the switching completion message is not received within the first preset time.

Meanwhile, please refer to fig. 11, which shows another structural diagram of a switching device based on carrier aggregation according to the present invention, including: a third receiving unit 1000, a third judging unit 2000, an aggregation secondary cell determining unit 3000, a first configuring unit 4000, a second configuring unit 5000, a third sending unit 6000, and a fourth receiving unit 7000. Wherein,

a third receiving unit 1000, configured to receive a handover request message sent by a source base station, where the handover request message includes a source primary cell identifier, a destination primary cell identifier, a UE identifier, and the candidate cell list;

a third determining unit 2000, configured to determine whether the target primary cell meets a handover requirement according to the target primary cell identifier;

an aggregation secondary cell determining unit 3000, configured to determine an aggregation secondary cell according to the candidate cell list when the third determining unit determines that the target primary cell meets the handover requirement;

a first configuration unit 4000 configured to configure the target primary cell;

a second configuration unit 5000, configured to sequentially configure the aggregation secondary cells after the first configuration unit completes configuration of the target primary cell;

a third sending unit 6000, configured to send a handover request acknowledgement message to the source base station after the second configuration unit completes configuration of the aggregation secondary cell, where the handover request acknowledgement message includes configuration information of the target primary cell and configuration information of the aggregation secondary cell that is successfully configured;

a fourth receiving unit 7000, configured to receive the handover complete message sent by the UE, activate the successfully configured aggregated secondary cell, and forward the handover complete message to the source base station.

Wherein the handover request message further includes: aggregating secondary cell information in a source base station;

Preferably, as shown in fig. 12, the aggregation secondary cell determining unit 3000 specifically includes:

a third deleting subunit 3001, configured to delete a cell that does not support carrier aggregation and/or has a high load in the candidate cell list;

a selecting subunit 3002, configured to select aggregated secondary cells from the remaining cells in the candidate cell list according to signal quality from high to low, where the signal quality includes reference signal received power RSRP or reference signal received quality RSRQ.

In addition, the present invention may further include:

a fourth determining unit 8000, configured to determine whether the acknowledgement information of the aggregated secondary cell is received within a second preset time;

a determining unit 9000, configured to determine that the configuration of the aggregation secondary cell is successful when the fourth determining unit 8000 determines that the confirmation information of the aggregation secondary cell is received within a second preset time; when the confirmation information of the aggregation secondary cell is not received within second preset time, determining that the configuration of the aggregation secondary cell fails, releasing the information of the aggregation secondary cell with the failed configuration, and deleting the aggregation secondary cell with the failed configuration from the candidate cell list; and determining a candidate cell list formed by the successfully configured aggregated secondary cells after deleting the unsuccessfully configured aggregated secondary cells as a final candidate cell list.

It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The carrier aggregation based switching method, the inter-board aggregation switching method and the inter-board aggregation switching device provided by the present invention are described in detail above, and a specific example is applied in the present document to illustrate the principle and the implementation manner of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A switching method based on carrier aggregation is characterized by comprising the following steps:

generating a candidate cell list according to the measurement report;

judging whether the target main cell meets the switching requirement or not;

sending a switching command to the UE, wherein the switching command comprises configuration information of a target main cell and configuration information of a successfully configured aggregation auxiliary cell, so that the UE reconfigures new target main cells and new aggregation auxiliary cells according to the configuration information of the target main cell and the configuration information of the successfully configured aggregation auxiliary cell after receiving the switching command;

wherein the generating a candidate cell list according to the measurement report comprises:

deleting cells which do not belong to the target base station in the cell list;

2. The method of claim 1, wherein the handover request message further comprises: aggregating secondary cell information in a source base station;

3. The method of any of claims 1-2, wherein after the sending the handover command to the UE, the method further comprises:

if the switching completion message is received within the first preset time, releasing the primary cell information and the secondary cell information of the source base station;

4. A switching method based on carrier aggregation is characterized by comprising the following steps:

receiving a switching request message sent by a source base station, wherein the switching request message comprises a source main cell identifier, a target main cell identifier, a User Equipment (UE) identifier and a candidate cell list;

configuring the target primary cell;

receiving a handover completion message sent by the UE, activating the successfully configured aggregated secondary cell, and forwarding the handover completion message to the source base station;

wherein the determining of the aggregated secondary cell according to the candidate cell list comprises:

5. The method of claim 4, wherein the handover request message further comprises: aggregating secondary cell information in a source base station;

6. The method of claim 4, wherein the number of the aggregated secondary cells is less than or equal to the number of the aggregated secondary cells in the source base station.

7. The method of claim 4, wherein after the configuring of the aggregated secondary cell is completed, the method further comprises:

8. An inter-board aggregation switching method based on carrier aggregation is characterized by comprising the following steps:

the source base station receives a switching request confirmation message sent by the target base station and sends a switching command to the UE, wherein the switching command comprises configuration information of a target main cell and configuration information of a successfully configured aggregation auxiliary cell, so that the UE reconfigures a new target main cell and a new aggregation auxiliary cell according to the configuration information of the target main cell and the configuration information of the successfully configured aggregation auxiliary cell after receiving the switching command;

wherein the generating, by the source base station, the candidate cell list according to the measurement report includes:

the source base station arranges all cells in the measurement report in a descending order according to signal quality to generate a cell list, wherein the signal quality comprises Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ);

the source base station deletes the cells which do not belong to the target base station in the cell list;

the source base station deletes the cell with the frequency point signal which is not the best in the cell with the same frequency point in the cell list;

and the source base station determines a cell list after deleting cells which do not belong to the target base station and deleting cells with the same frequency points, wherein the frequency point signals of the cells are not the best cells, as a candidate cell list.

9. A switching device based on carrier aggregation, comprising:

a second sending unit, configured to send a handover command to the UE, where the handover command includes configuration information of a target primary cell and configuration information of a successfully configured aggregation secondary cell, so that after receiving the handover command, the UE reconfigures new target primary cells and aggregation secondary cells according to the configuration information of the target primary cell and the configuration information of the successfully configured aggregation secondary cell;

wherein the candidate cell list generating unit includes:

10. The apparatus of claim 9, wherein the handover request message further comprises: aggregating secondary cell information in a source base station;

11. The apparatus according to any one of claims 9 to 10,

a second judging unit, configured to judge whether a handover completion message sent by the target base station is received within a first preset time;

12. A switching device based on carrier aggregation, comprising:

a third receiving unit, configured to receive a handover request message sent by a source base station, where the handover request message includes a source primary cell identifier, a destination primary cell identifier, a UE identifier, and a candidate cell list;

a first configuration unit, configured to configure the target primary cell;

a fourth receiving unit, configured to receive a handover completion message sent by the UE, activate the successfully configured aggregated secondary cell, and forward the handover completion message to the source base station;

the aggregation secondary cell determination unit includes:

13. The apparatus of claim 12, wherein the handover request message further comprises: aggregating secondary cell information in a source base station;

14. The apparatus of claim 12 or 13, further comprising: