CN106792934B - Switching method and device - Google Patents

Switching method and device Download PDF

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CN106792934B
CN106792934B CN201510829013.4A CN201510829013A CN106792934B CN 106792934 B CN106792934 B CN 106792934B CN 201510829013 A CN201510829013 A CN 201510829013A CN 106792934 B CN106792934 B CN 106792934B
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base station
mme
cell
user equipment
target cell
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CN106792934A (en
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杨琦
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Datang Mobile Communications Equipment Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a switching method and a switching device. The method comprises the following steps: a first base station receives a measurement report reported by user equipment; the first base station acquires an MME identifier corresponding to the candidate target cell according to the candidate target cell indicated in the measurement report; the first base station selects a target cell for the user equipment according to the MME identification corresponding to the candidate target cell and the MME connected with the user equipment, wherein the MME corresponding to the selected target cell is the same as the MME connected with the user equipment; and the first base station sends a switching request message to the corresponding second base station according to the selected target cell. The invention can avoid the base station from sending the switching request message to the target base station which can not realize the switching of the user equipment, ensure the switching success rate of the user equipment, reduce the quantity of the switching request messages sent by the base station and further reduce the network load.

Description

Switching method and device
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a handover method and apparatus.
Background
At present, a mobile communication network has entered the 4G era, an LTE (Long Term Evolution) network has a high frequency band and a small cell coverage radius, and if a 4G signal is to be continuously covered, an operator needs to increase the number of base stations and construct network wireless resource sharing. For wireless resource sharing, there is currently a wireless network built by multiple MME (mobile Management Entity) environments.
The MME is a key control node of the LTE access network, and is responsible for idle mode UE (User Equipment) positioning and paging processes, including relaying, and simply, the MME is responsible for signaling processing. It involves bearer activation/deactivation procedures and selects an SGW (Serving Gate Way) for a UE when the UE initializes and connects. A user is authenticated by interacting with an HSS (Home Subscriber Server), and a temporary ID is assigned to the user.
In the edge zone in such networking environment, there may be inconsistency of the core network parameters configured by two base stations continuously covered, which may result in blocking of mobility handover of some users. To take a simple example: the A base station is configured with a plurality of MME (MME1, MME2, … …), the B base station is configured with only one MME1, the A base station and the B base station are configured with MME1 together, and an X2 link (the condition is optional) is configured between the A and the B, and all cells among 2 base stations have adjacent cell relations. The UE is accessed to the base station A, the access is completed at the MME2, and therefore when the UE moves between the two base stations, when the base station A judges to perform Cell switching on the UE according to a measurement report reported by the UE, the base station A sends a switching request message to a corresponding target Cell in the base station B according to a Physical Cell Identifier (PCI) of an adjacent Cell in the measurement report, and the base station B judges that the MME connected with the UE is inconsistent according to a Globally Unique MME Identifier (Globally Unique MME Identifier) in the switching request message, so that a switching preparation failure response is replied to the base station A, the switching failure rate is high, and the user call drop rate is high.
Disclosure of Invention
An embodiment of the present invention provides a handover method and apparatus for reducing a handover failure rate.
An embodiment of the present invention provides a handover method, including:
a first base station receives a measurement report reported by user equipment;
the first base station acquires an MME identifier corresponding to the candidate target cell according to the candidate target cell indicated in the measurement report;
the first base station selects a target cell for the user equipment according to the MME identification corresponding to the candidate target cell and the MME connected with the user equipment, wherein the MME corresponding to the selected target cell is the same as the MME connected with the user equipment;
and the first base station sends a switching request message to the corresponding second base station according to the selected target cell.
Specifically, the first base station sends a handover request message to the second base station corresponding to the target cell through the X2 link.
The selecting, by the first base station, the target cell for the user equipment according to the MME identifier corresponding to the candidate target cell and the MME to which the user equipment is connected includes:
and the first base station selects a cell with the strongest received signal as the target cell of the user equipment from the candidate target cells of which the corresponding MME is the same as the MME connected with the user equipment.
Before the first base station receives the measurement report reported by the user equipment, the method further includes:
the first base station establishes an X2 link with the second base station, receives an X2 link establishment response message sent by the second base station, and acquires an identifier of a cell on the second base station, which is carried in the X2 link establishment response message, and an MME list or an MME group list corresponding to the identifier of the cell, wherein the cell on the second base station and the cell on the first base station have a neighboring cell relationship, the MME list includes one or more MMEs, and the MME group list includes one or more MME groups.
After the first base station establishes an X2 link with the second base station, the method further includes:
the first base station receives a base station configuration update message sent by the second base station, and acquires an identifier of a cell on the second base station, which is carried in the base station configuration update message, and an MME list or an MME group list corresponding to the identifier of the cell, wherein the cell on the second base station and the cell on the first base station have a neighboring cell relationship, the MME list comprises one or more MME, and the MME group list comprises one or more MME groups.
The MME identification comprises a globally unique MME identification GUMMEI.
An embodiment of the present invention provides a base station, including:
a receiving module: the device is used for receiving a measurement report reported by user equipment;
a first obtaining module: the MME is used for acquiring an MME identifier corresponding to the candidate target cell according to the candidate target cell indicated in the measurement report;
a selection module: the MME is used for selecting a target cell for the user equipment according to the MME identification corresponding to the candidate target cell and the MME connected with the user equipment, and the MME corresponding to the selected target cell is the same as the MME connected with the user equipment;
a sending module: and the base station is used for sending a switching request message to the corresponding second base station according to the selected target cell.
Specifically, the sending module 604 sends the handover request message to the second base station corresponding to the target cell through the X2 link.
The selecting module is specifically configured to select, as the target cell of the user equipment, a cell with a strongest received signal from candidate target cells in which the corresponding MME is the same as the MME to which the user equipment is connected.
The base station further includes a second obtaining module, configured to receive, in a process of establishing an X2 link with the second base station, an X2 link establishment response message sent by the second base station, and obtain an identifier of the cell on the second base station, which is carried in the X2 link establishment response message, and an MME list or an MME group list corresponding to the identifier of the cell, where the cell on the second base station and the cell on the first base station have a neighboring cell relationship, the MME list includes one or more MMEs, and the MME group list includes one or more MME groups.
The second obtaining module is further configured to: receiving a base station configuration update message sent by the second base station, and acquiring an identifier of a cell on the second base station, which is carried in the base station configuration update message, and an MME list or an MME group list corresponding to the identifier of the cell, where the cell on the second base station and the cell on the first base station have a neighboring cell relationship, the MME list includes one or more MMEs, and the MME group list includes one or more MME groups.
The MME identification comprises a globally unique MME identification GUMMEI.
In the above embodiment of the present invention, after receiving a measurement report reported by a user equipment, a base station selects a target cell for the user equipment according to an MME identifier corresponding to a candidate target cell in the measurement report and an MME to which the user equipment is connected, where the MME corresponding to the selected target cell is the same as the MME to which the user equipment is connected, so that a handover failure caused by a difference between the MME corresponding to the target cell selected by the user equipment and the MME to which the user equipment is currently connected is avoided, and a handover success rate of the user equipment is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flowchart illustrating a link handover preparation failure based on X2 in the prior art;
fig. 2 is a schematic flowchart of a handover method according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a base station selecting a target cell for a user equipment according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a link establishment procedure of X2 according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a base station configuration update process according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, 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.
In an LTE network, the S1FLEX technology and RAN Sharing technology are becoming mature, and radio resource Sharing will be the main trend of operators to build networks in the future. However, in such a context, the user mobility experience is often restricted and limited by the radio network side, and this limitation results from that the core network information configured by the target cell for selecting handover and the serving cell is inconsistent during the user moving process, which often causes handover failure.
Referring to fig. 1, a schematic diagram of a prior art process for preparing a failure for a link handover based on X2 is shown. The source base station sends a switching request message to a target base station, and the target base station determines an MME connected with user equipment requesting for switching according to a PLMN ID (Public land Mobile Network Identity), a GU Group ID (Global unique Group Identity) and an MME code (number) in the GUMMEI in the switching request message. When the target base station judges that the MME connected with the user equipment is inconsistent with the MME configured by the core network of the base station, returning a message of failure of switching preparation of the source base station, wherein the value of the information of Cause carried in the message is as follows: unworn-MME-code. If the user equipment is always at the position, the same measurement result is always reported according to the measurement reporting period and the times configured by the source base station, the source base station always sends a handover request to the target base station, and the target base station always replies that the handover request fails and repeats. Therefore, the switching failure rate of the user equipment is high, the call drop rate of the user is high, the number of switching request messages sent by the base station is increased, and the network load is increased.
In view of the above problems, an embodiment of the present invention provides a handover method, so as to solve the problem in the prior art that mobility handover of some users is blocked due to different MME configurations of two base stations.
In the embodiment of the present invention, after receiving a measurement report reported by a user equipment, a source base station acquires a corresponding MME identifier or MME group identifier according to a candidate target cell in the measurement report (each MME group includes one or more fixed MMEs, and an MME code included in each MME group is pre-configured in the source base station), and selects a target cell for the user equipment in combination with an MME currently connected to the user equipment, so as to ensure that an MME corresponding to the selected target cell is the same as an MME connected to the user equipment.
The source base station stores MME identifiers corresponding to some cells, or MME group identifiers corresponding to the cells. The cells are configured on the neighboring base station of the source base station, and preferably, the cells and the cell of the source base station have a neighboring cell relationship. The MME identifier corresponding to the neighboring cell of the base station cell or the MME group identifier corresponding to the cell configured on a base station may be configured on the base station in the following ways:
mode 1:
taking the base station a and the base station B as an example, when the base station a and the base station B establish the X2 link, the base station a sends an X2 link establishment request message to the base station B, and the base station B returns an X2 link establishment response message to the base station a, and the flow is shown in fig. 4. The X2 link establishment response message carries the identifier of the cell on the base station B, and an MME list or an MME group list corresponding to the identifier of the cell, where the cell on the base station B may be a cell having a neighboring cell relationship with the cell on the base station a, or may be all cells on the base station B; the MME list includes one or more MME identifiers configured by the base station B, or the MME group list includes one or more MME group identifiers configured by the base station B. For example: the information contained in the X2 link setup response message may be as shown in table 1.
TABLE 1
Figure BDA0000857367150000061
Figure BDA0000857367150000071
In table 1, the Served Cells information element includes information about a cell on the base station B and its neighboring Cells; the GU Group ID List (globally unique Group identification List) information element includes one or more GU Group IDs, and each GU Group ID is used to identify one MME Group. As shown in table 2, the GU Group ID may be composed of a PLMN ID and an MME Group ID (MME Group identity).
TABLE 2
Figure BDA0000857367150000081
Thus, the base station a can obtain the cell identifier on the base station B and the MME Group list corresponding to the cell identifier through the used Cells information element and the GU Group IDList information element in the X2 link setup response message.
Mode 2:
taking the base station a and the base station B as an example, after the link X2 is successfully established, when the configuration information of the base station, for example, the MME configured by the base station a, changes, a base station configuration update process is performed, where the process is shown in fig. 5, the base station a sends a base station configuration update message to the base station B, and the base station B returns a base station configuration update confirmation message to the base station a. The base station configuration update message carries the updated Served Cells and/or the updated GU Group ID List of the base station a, so that the updated cell ID of the base station a and the configured MME can both notify the neighboring base stations through the base station configuration update process. The information included in the base station configuration update message may be as shown in table 3, where the Served Cells To Add (the added serving cell) includes the added serving cell after the base station a configuration is updated, the Served Cells To Modify (the changed serving cell) includes the changed serving cell after the base station a configuration is updated, and the Served Cells To Delete (the deleted serving cell) includes the deleted serving cell after the base station a configuration is updated; the GU Group ID To Add List (global unique Group ID added List) includes MMEs added after the configuration of the base station a is updated, and the GU Group ID To Delete List (global unique Group ID deleted List) includes MMEs deleted after the configuration of the base station a is updated.
TABLE 3
Figure BDA0000857367150000082
Figure BDA0000857367150000091
Figure BDA0000857367150000101
Mode 3:
the base station may further obtain an MME identifier corresponding to a neighboring cell of the base station or an MME group identifier corresponding to the neighboring cell by receiving a message sent by the network management device. The network management device may manage a plurality of base stations, and the network management device may store configuration information related to the plurality of base stations, such as PCI of a cell, information related to MME configured for the base station (such as GUMMEI), a neighbor relation table, and the like. Taking an example that an X2 link exists between the base station a and the base station B, and the cells on the base station B are all neighboring cells of the cells on the base station a, the network management device may send the cell identifier on the base station B and the MME identifier corresponding to the cell identifier or the MME group identifier corresponding to the neighboring cell to the base station a. After receiving the cell identifier and the corresponding MME identifier of the base station B or the MME group identifier corresponding to the neighboring cell, the base station a stores the cell identifier and the corresponding MME identifier in the local area.
Optionally, the base station a may add, according to the MME configured by the base station a and the MME configured by the base station B, the cells (cell pairs) having the neighboring cell relationship on the base station B and the base station a to different identifier groups, and store the cells respectively, where each identifier group corresponds to one MME. For example: the base station a is configured with MME1, MME2, and MME3, the base station B is configured with MME1 only, cell m on the base station a and cell x on the base station B are neighboring cells, cell n on the base station a and cell y on the base station B are neighboring cells, then the base station a can establish an identifier group using MME1 as an index, and the identifier group includes 2 cell pairs: (cell m, cell x), (cell n, cell y).
Referring to fig. 2, a flowchart of a handover method according to an embodiment of the present invention is shown. The flow describes a handover process of the user equipment, and for convenience of description, a source base station of the user equipment is referred to as a first base station, and a target base station determined for the user equipment is referred to as a second base station.
As shown, the process may include the following steps:
step 101: and the first base station receives the measurement report reported by the user equipment.
There are various purposes of the ue measurement, and the measurement report refers to a measurement report reported to the ue for handover. The measurement report may include information related to a candidate target cell measured by the ue, such as an identifier of the candidate target cell, a Signal received strength of the candidate target cell, and the like, where the identifier of the candidate target cell may be a PCI of the candidate target cell, and the Signal received strength of the candidate target cell may be characterized by RSRP (Reference Signal receiving power).
Step 102: and the first base station acquires the MME identifications corresponding to the candidate target cells according to the candidate target cells indicated in the measurement report.
Before step 101, the first base station already obtains an MME identity corresponding to a neighboring cell, and the obtaining method may be one or more of manners 1 to 3. The step 102 of obtaining the MME identities corresponding to the candidate target cells means obtaining, from the stored MME identities of the neighboring cells, the MME identities corresponding to the candidate target cells included in the measurement report reported by the user equipment.
Taking the data storage structure of the cell identifier and the corresponding MME identifier as an example, assuming that the first base station is the base station a and the second base station is the base station B, the base station a may query, for a candidate target cell, a corresponding identifier group with the MME identifier thereof according to the MME currently connected to the user equipment, and determine whether the identifier group includes the following cell pairs: (the source cell where the ue is currently located, the candidate target cell), if there is, the candidate target cell may be used as the target cell of the ue in the subsequent step 103.
Specifically, the MME identifier may be used to uniquely identify one MME, and preferably, the MME identifier may be a globally unique MME identifier GUMMEI.
Step 103: and the first base station selects a target cell for the user equipment according to the MME identification corresponding to the candidate target cell and the MME connected with the user equipment, wherein the MME corresponding to the selected target cell is the same as the MME connected with the user equipment.
And the MME connected with the user equipment is obtained by the first base station when the user equipment is connected to the first base station. If the user equipment is initially accessed, the first base station may obtain an MME to which the user equipment is connected through a GUMMEI in an Initial UE Message (Initial user Message); if the user equipment is switched by other base stations, the first base station can acquire the MME connected with the user equipment through the GUMMEI in the switching request message.
Specifically, in step 103, the first base station selects a cell with the strongest received signal as the target cell of the user equipment from the candidate target cells, where the corresponding MME is the same as the MME to which the user equipment is connected.
The cell with the strongest signal is obtained by comparing RSRP or comprehensively comparing RSRP and RSRQ (referred signal Receiving Quality), and then determining which candidate target cell is the cell with the strongest signal. The RSRP is an average received power of a CRS (Cell Specific reference signal) within a certain measurement bandwidth, and is an average received power of a portion not including a cyclic prefix in a corresponding OFDM (Orthogonal frequency division Multiplexing) symbol. RSRP is an important indicator for measuring network coverage. The RSRQ is a ratio of N times RSRP to RSSI (Received Signal strength indication) for ranking different candidate target cells according to Signal quality.
Referring to fig. 3, a schematic flow chart of selecting a target cell for a user equipment by a first base station is shown. Firstly, acquiring an MME identifier corresponding to a cell with the strongest signal, judging whether MME connected with user equipment is the same, and if so, selecting the cell as a target cell; if the cell is different from the target cell, acquiring the MME identifier corresponding to the neighboring cell of the cell, and determining whether the MME identifier connected with the user equipment is the same as the neighboring cell of the cell. And if the MME corresponding to all the cells in the candidate target cell is different from the MME connected with the user equipment, the base station does not perform switching processing on the measurement report currently reported by the user equipment.
Step 104: and the first base station sends a switching request message to the corresponding second base station according to the selected target cell.
Specifically, the first base station sends a handover request message to the second base station corresponding to the target cell through the X2 link.
In the embodiment of the present invention, after receiving the measurement report reported by the user equipment, the base station selects the candidate target cell, which is the same as the MME connected to the user equipment, as the handover target cell of the user equipment according to the MME identifier corresponding to the candidate target cell in the measurement report and the MME connected to the user equipment, and sends the handover request message to the base station corresponding to the target cell, thereby ensuring the handover success rate of the user equipment, reducing the number of handover request messages sent by the base station, and reducing the network load.
Based on the same technical concept, the embodiment of the invention also provides a base station, wherein the base station is a first base station and can execute the method embodiment.
Referring to fig. 6, a schematic structural diagram of a base station is provided in the embodiment of the present invention. The base station includes: the receiving module 601, the first obtaining module 602, the selecting module 603, and the sending module 604, further, a second obtaining module 605 may also be included.
The receiving module 601: the method is used for receiving the measurement report reported by the user equipment.
The first obtaining module 602: and the MME identifier corresponding to the candidate target cell is acquired according to the candidate target cell indicated in the measurement report.
Specifically, the MME identifier may be used to uniquely identify one MME, and preferably, the MME identifier may be a globally unique MME identifier GUMMEI.
The selection module 603: and the MME is used for selecting the target cell for the user equipment according to the MME identification corresponding to the candidate target cell and the MME connected with the user equipment, wherein the MME corresponding to the selected target cell is the same as the MME connected with the user equipment.
Specifically, the selecting module 603 is specifically configured to select, as the target cell of the user equipment, a cell with a strongest received signal from candidate target cells, where the candidate target cells are the same as the candidate target cells of the MME to which the user equipment is connected.
Since the base station provided in the embodiment of the present invention is based on the same technical concept as the handover method provided in the above embodiment, the working flow of the selection module 603 can also refer to fig. 3. The selecting module 603 first determines whether the MME corresponding to the cell with the strongest signal is the same as the MME connected to the user equipment, and if so, selects the cell as the target cell; if the signals are different, whether the MME corresponding to the adjacent cell of the cell is the same as the MME connected with the user equipment or not is judged, if so, the cell is selected as the target cell, and if not, whether the MME corresponding to the adjacent cell of the second signal is the same as the MME connected with the user equipment or not is judged continuously. If the MMEs corresponding to all the cells in the candidate target cell are different from the MME to which the user equipment is connected, the selecting module 603 does not select the target cell for the user equipment, that is, the base station does not perform handover processing on the measurement report currently reported by the user equipment.
The sending module 604: and the base station is used for sending a switching request message to the corresponding second base station according to the selected target cell.
Specifically, the sending module 604 sends the handover request message to the second base station corresponding to the target cell through the X2 link.
Further, the base station provided in the embodiment of the present invention may further include a second obtaining module 605, configured to receive, in a process of establishing an X2 link with a second base station, an X2 link establishment response message sent by the second base station, and obtain an identifier of a cell on the second base station, which is carried in the X2 link establishment response message, and an MME list or an MME group list corresponding to the identifier of the cell, where the cell on the second base station and the cell on the first base station have a neighboring cell relationship, the MME list includes one or more MMEs, and the MME group list includes one or more MME groups.
Optionally, the second obtaining module 605 may be further configured to receive a base station configuration update message sent by a second base station, and obtain an identifier of a cell on the second base station, which is carried in the base station configuration update message, and an MME list or an MME group list corresponding to the identifier of the cell, where the cell on the second base station and the cell on the first base station have a neighboring cell relationship, the MME list includes one or more MMEs, and the MME group list includes one or more MME groups.
In the embodiments of the present invention, after receiving a measurement report reported by a user equipment, a base station selects a candidate target cell, which is the same as an MME connected to a user equipment, as a handover target cell of the user equipment according to an MME identifier corresponding to the candidate target cell in the measurement report and the MME connected to the user equipment, and sends a handover request message to a base station corresponding to the target cell, so that the base station is prevented from sending the handover request message to a target base station that cannot implement handover of the user equipment, a handover success rate of the user equipment is ensured, and the number of handover request messages sent by the base station is reduced, thereby reducing a network load.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A method of handover, comprising:
a first base station receives a measurement report reported by user equipment;
the first base station acquires an MME identifier corresponding to the candidate target cell according to the candidate target cell indicated in the measurement report;
the first base station selects a target cell for the user equipment according to the MME identification corresponding to the candidate target cell and the MME connected with the user equipment, wherein the MME corresponding to the selected target cell is the same as the MME connected with the user equipment;
and the first base station sends a switching request message to the corresponding second base station according to the selected target cell.
2. The method of claim 1, wherein the selecting, by the first base station, the target cell for the ue according to the MME identifier corresponding to the candidate target cell and the MME to which the ue is connected comprises:
and the first base station selects a cell with the strongest received signal as the target cell of the user equipment from the candidate target cells of which the corresponding MME is the same as the MME connected with the user equipment.
3. The method of claim 1, wherein before the first base station receives the measurement report reported by the ue, the method further comprises:
the first base station establishes an X2 link with the second base station, receives an X2 link establishment response message sent by the second base station, and acquires an identifier of a cell on the second base station, which is carried in the X2 link establishment response message, and an MME list or an MME group list corresponding to the identifier of the cell, where the cell on the second base station and the cell on the first base station have a neighboring cell relationship, the MME list includes one or more MMEs, the MME group list includes one or more MME groups, and the MME identifier included in each MME group is pre-configured in the first base station.
4. The method of claim 3, wherein after the first base station establishes an X2 link with the second base station, further comprising:
the first base station receives a base station configuration update message sent by the second base station, and acquires an identifier of a cell on the second base station, which is carried in the base station configuration update message, and an MME list or an MME group list corresponding to the identifier of the cell, wherein the cell on the second base station and the cell on the first base station have a neighboring cell relationship, the MME list comprises one or more MME, and the MME group list comprises one or more MME groups.
5. The method of any one of claims 1 to 4, wherein the MME identification comprises a globally unique MME identification (GUMMEI).
6. A base station, wherein the base station is a first base station, and wherein the first base station comprises:
a receiving module: the device is used for receiving a measurement report reported by user equipment;
a first obtaining module: the MME is used for acquiring an MME identifier corresponding to the candidate target cell according to the candidate target cell indicated in the measurement report;
a selection module: the MME is used for selecting a target cell for the user equipment according to the MME identification corresponding to the candidate target cell and the MME connected with the user equipment, and the MME corresponding to the selected target cell is the same as the MME connected with the user equipment;
a sending module: and the base station is used for sending a switching request message to the corresponding second base station according to the selected target cell.
7. The base station of claim 6, wherein the selection module is specifically configured to:
and selecting the cell with the strongest received signal as the target cell of the user equipment from the candidate target cells of which the corresponding MME is the same as the MME connected with the user equipment.
8. The base station of claim 6, further comprising:
a second obtaining module: the MME-MME group establishing method includes receiving an X2 link establishment response message sent by the second base station in a process of establishing an X2 link with the second base station, and acquiring an identifier of a cell on the second base station, which is carried in the X2 link establishment response message, and an MME list or an MME group list corresponding to the identifier of the cell, where the cell on the second base station and the cell on the first base station have a neighboring cell relationship, the MME list includes one or more MMEs, the MME group list includes one or more MME groups, and an MME identifier included in each MME group is pre-configured in the first base station.
9. The base station of claim 8, wherein the second acquisition module is further configured to:
receiving a base station configuration update message sent by the second base station, and acquiring an identifier of a cell on the second base station, which is carried in the base station configuration update message, and an MME list or an MME group list corresponding to the identifier of the cell, where the cell on the second base station and the cell on the first base station have a neighboring cell relationship, the MME list includes one or more MMEs, and the MME group list includes one or more MME groups.
10. The base station according to any of claims 6 to 9, wherein the MME identification comprises a globally unique MME identification, GUMMEI.
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