CN105101266A

CN105101266A - Self-optimization realization method in mobile communication system and base stations

Info

Publication number: CN105101266A
Application number: CN201510426924.2A
Authority: CN
Inventors: 许丽香; 王弘; 陈喆
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2009-08-21
Filing date: 2009-08-21
Publication date: 2015-11-25
Anticipated expiration: 2029-08-21
Also published as: CN101998468A; CN101998468B; CN105101266B

Abstract

The present invention discloses a method for realizing self-optimization in a mobile communication system and a base station, wherein the method includes the following steps: step A, the first base station judges whether the current state of the cell controlled by it needs to be switched to another state opposite to the current state A state, if yes, send a cell state notification to all base stations adjacent to it; the cell state notification has carried the identification of the cell to switch state; step B, the base station adjacent to the first base station updates the adjacent relationship list The state corresponding to the identity of the cell carried in the cell state notification. By adopting the invention, self-optimization in the mobile communication system can be realized.

Description

Method for realizing self optimization in mobile communication system and base station

Technical Field

The present invention relates to mobile communication technologies, and in particular, to a method and a base station for implementing self-optimization in a mobile communication system.

Background

In mobile communication technology, for the purpose of simplifying signaling flow and shortening information transmission delay, an evolved UMTS radio access network (EUTRAN: evolved UTRAN) abandons Radio Network Control (RNC) and node b (nodeb) structures of UTRAN, and consists entirely of base stations (eNB: eNodeB). Referring to fig. 1, fig. 1 is a simple topology of a prior art EUTRAN network. As shown in fig. 1, EUTRAN mainly includes an eNB, and preferably may further include a home base station (HeNB). The EUTRAN network may be connected to the core network through an S1 interface, specifically: the enbs or henbs in an EUTRAN network are connected to entities in the core network, such as Mobility Management Entities (MMEs), and the enbs in an EUTRAN network may be directly connected to each other through a corresponding X2 interface.

Generally, after an eNB in an EUTRAN network is powered on, it needs to perform self-configuration according to the setting of an ideal scene such as experience or simulation. The self-configuration comprises two processes of basic starting and wireless parameter setting. The basic start-up includes at least the following processes: (1) configuring an IP address and a detection OAM server; here, when the eNB is powered on, the eNB first needs to establish an initial logical connection with the OAM server, for completing the authentication function and obtaining information needed for correct connection to the network; in order to establish connection with the OAM server, the eNB needs to know its own IP address, and specifically, may dynamically obtain its own IP address by using a widely used RFC protocol such as DHCP, and then detect the OAM server according to the IP address; (2) authentication between the eNB and the network, wherein in order to ensure the safe operation of the network, the eNB generally needs to obtain authentication of the network before further operation is performed after the eNB establishes initial connection with the OAM server; (3) downloading of eNB software and operating parameters, and the like. And then, starting initial wireless parameter configuration, wherein the initial wireless parameter configuration mainly comprises configuration of a neighbor cell list, parameter configuration related to coverage capacity and the like.

Those skilled in the art will appreciate that the application scenario of a real network is not ideal and will often vary greatly depending on the building, climate, surrounding environment, etc. Therefore, after the eNB in the existing EUTRAN network performs preset self-configuration according to an ideal scene such as experience or simulation, many obtained parameters are not optimized parameters required in an actual network, and thus, the network performance is reduced. In order to enable a network to have better performance and meet the requirements of operators and users, a self-optimization implementation method in a mobile communication system is a problem to be solved urgently at present.

Disclosure of Invention

The invention provides a method for realizing self-optimization in a mobile communication system and a base station, which are used for realizing self-optimization in the mobile communication system and improving network performance.

A method for implementing self-optimization in a mobile communication system, the method comprising the steps of:

step A, a first base station judges whether the current state of a cell controlled by the first base station needs to be switched to another state opposite to the current state, and if so, the first base station sends a cell state notice to a base station adjacent to the first base station; the cell state notification carries the identification of the cell to be switched;

and step B, the base station adjacent to the first base station updates the state corresponding to the cell identifier carried by the cell state notification in the adjacent relation list.

A system for implementing self-optimization in a mobile communication system comprises a first base station and a second base station; the second base station is a base station adjacent to the first base station;

the first base station judges whether the current state of a cell controlled by the first base station needs to be switched to another state opposite to the current state, and if so, the first base station sends a cell state notification to a second base station; the cell state notification carries the identification of the cell to be switched;

and the second base station updates the state corresponding to the cell identifier carried by the cell state notification in the proximity relation list.

A base station, the base station comprising: the device comprises a control unit, a judgment unit and a sending unit; wherein,

the control unit is used for controlling the cell;

the judging unit is used for judging whether the current state of the cell controlled by the control unit needs to be switched to another state opposite to the current state;

the sending unit is used for sending a cell state notification to a base station adjacent to the sending unit when the judgment result of the judging unit is yes; the cell state notification carries the identification of the cell to be switched.

It can be seen from the above technical solutions that, in the self-optimization implementation method and base station in the mobile communication system provided by the present invention, the first base station determines whether the current state of the cell controlled by the first base station needs to be switched to another state opposite to the current state, where the current state is an open state and the another state opposite to the current state is a closed state; or, the current state is a closed state, and the other state opposite to the current state is an open state; if yes, sending a cell state notice to the adjacent base station; the cell state notification carries the identification of the cell to be switched; and the base station adjacent to the first base station updates the state corresponding to the cell identifier carried by the cell state notification in the adjacent relation list. It can be seen that, after the self-configuration in the prior art, the method provided by the present invention can automatically close or open the cells in the network, and adjust the network capacity and coverage, thereby achieving the purposes of saving power and reducing interference.

Drawings

FIG. 1 is a prior art network architecture diagram;

FIG. 2 is a flow chart of a first embodiment of the present invention;

fig. 3 to 8 are first to sixth flowcharts provided in embodiment 1 of the present invention;

FIG. 9 is a flow chart of a second embodiment provided by the present invention;

fig. 10 to 12 are first to third flowcharts provided in embodiment 2 of the present invention;

FIG. 13 is a block diagram of a system provided by an embodiment of the present invention;

fig. 14 is a 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 more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The self-optimization method provided by the embodiment of the invention mainly comprises the following steps: the first base station judges whether the current state of the cell controlled by the first base station needs to be switched to another state opposite to the current state, and if so, the first base station sends a cell state notice to all base stations adjacent to the first base station; the cell state notification carries the identification of the cell to be switched; and the base station adjacent to the first base station updates the state corresponding to the cell identifier carried by the cell state notification in the adjacent relation list. Therefore, the states of the cells in the network can be automatically adjusted according to actual conditions, such as closing the cells and opening the cells, and the network performance is improved.

For example, if the current state of the cell is an off state (specifically, the cell does not provide service any more), the other state opposite to the current state is an on state (specifically, the cell provides service); if the current state of the cell is an open state, the other state opposite to the current state is a closed state. When the cell state notification is specifically implemented, there may be multiple implementation forms, such as: if the current state of the cell is an open state, and another state opposite to the current state is a closed state, it can be seen that the first base station currently needs to close the cell controlled by the first base station and already in the open state, and thus, the cell state notification may specifically be a close notification message in the first embodiment described below; if the current state of the cell is an off state, and another state opposite to the current state is an on state, it can be seen that the first base station currently needs to open the cell, and the cell state notification may specifically be an on notification message in the second embodiment, which is specifically described below.

In order to make the present embodiment clearer, the method provided by the embodiment of the present invention is described in detail below.

The first embodiment:

the embodiment mainly describes a method flow for realizing self-optimization by closing a cell by a base station, namely, the method flow is described for switching the state of the cell from an open state to a closed state. Referring to fig. 2, fig. 2 is a flow chart of a first embodiment of the present invention. As shown in fig. 2, the process may specifically include the following steps:

step 201, the eNB1 determines whether the current load of the cell controlled by the eNB1 in the open state is lower than a set threshold, the eNB1 determines that the cell needs to be closed according to the load of the current cell and the load of the cell adjacent to the current cell, and executes step 202; otherwise, the open state of the cell is maintained. The eNB1 knows the load situation of neighboring eNB neighbor cells according to the resource status update procedure of the existing X2 interface (refer to 3GPP specification TS36.423 specifically).

Generally, after a terminal arrives at a cell, for example, cell 1, the signal quality of cell 1 and other cells adjacent to cell 1 are measured, and then the measured signal quality of each cell is carried in a measurement report and sent to a base station to which cell 1 belongs. The set threshold value may be set according to a principle that cell resources are not wasted, and when the current load of the cell is lower than the threshold value, it indicates that the current load can be completely served by an adjacent cell having an overlapping coverage relationship with the cell, that is, the cell can be closed. The adjacent cell having the overlapping coverage relationship with the cell is specifically that the cell is overlapped and covered by the adjacent cell, or the adjacent cell is overlapped and covered by the cell, or has the same coverage area. For convenience of description, the determined cell that needs to be turned off is referred to as cell 1.

Step 202, determining a destination cell to which the current load in cell 1 needs to be switched.

Here, determining which cell or cells adjacent to cell 1 the current load in cell 1 needs to be switched to may be determined according to a measurement report provided by a terminal in cell 1, where the measurement report includes signal strengths of cell 1 and cells adjacent to cell 1 measured by the terminal; thus, the determining operation in step 202 specifically includes: selecting a cell with the strongest signal from neighboring cells of the cell 1 according to a measurement report sent by a terminal, and determining the selected cell as a target cell to which the current load in the cell 1 needs to be switched, wherein the number of the cells to which the current load in the cell 1 needs to be switched may be more than one. Here, for convenience of description, a cell to which the current load in the cell 1 needs to be handed over is denoted as a cell 2.

Step 203, eNB1 determines whether cell 2 is controlled by itself, if yes, go to step 204; otherwise, step 205 is performed.

Here, the judgment in step 203 is specifically: the eNB1 determines whether the cell 2 is in the set cell control list, if so, the eNB1 determines that the cell 2 is controlled by itself, otherwise, determines whether the cell 2 is in the set neighbor list, and if so, determines that the cell 2 is controlled by a neighbor base station and acquires a base station (for convenience of description, referred to as eNB2) to which the cell 2 belongs.

Here, if it is determined in step 202 that the number of the target cells is greater than 1, it is determined for each target cell whether the target cell is controlled by itself, and if so, step 204 is performed; otherwise, step 205 is performed.

Step 204, eNB1 determines whether there is available resource in cell 2 and needed by the current load in cell 1, if yes, execute step 207; otherwise, the current flow is ended.

Here, if the number of the target cells determined in step 202 is greater than 1 and is controlled by eNB1, eNB1 shares the resources required by the current load in cell 1 to each target cell according to the load balancing principle, and then determines, for each target cell, whether the target cell has available resources that are required by the load in cell 1, and if so, performs step 207; otherwise, the current flow is ended.

In step 205, the eNB1 sends a close preparation request to the eNB 2.

Here, the closing preparation request carries information related to closing the cell, and specifically may be: the identifier of the cell 1 to be turned off, i.e. the cell 1, optionally, the message further includes the identifier of the target cell to which the cell 1 needs to be switched, i.e. the cell 2, and the resource that needs to be provided by the target cell; wherein the resource is specifically a resource required by the current load in the cell 1 to be turned off, and may be represented by the number of UEs switched into the destination cell or a Physical Resource Block (PRB) occupied by the UE; of course, if it is determined in step 202 that the number of the destination cells to which the current load in the cell 1 needs to be switched is greater than 1, then the resources required by the current load in the cell 1 are assumed by each destination cell according to the load balancing principle, so that the resources carried by the shutdown preparation request in step 205 may be the resources assumed by the destination cell, which are not all the resources required by the current load in the cell 1 to be shutdown.

In this step, if the case 1 is, eNB1 directly sends a close preparation request to eNB2 through an X2 interface; if it is the case 2, the close preparation request further carries the identifier of the source eNB, i.e. eNB1, and the identifier of the destination base station, i.e. eNB2, where the source eNB identifier includes the global identifier of the source eNB and the selected routing area identifier (TAI, mainly used for identifying the route between the source eNB and the MME connected between the source eNB and the destination eNB) 1, and the identifier of the destination eNB includes the global identifier of the destination eNB and the selected TAI2, here, the close preparation request is made to carry the identifier of the source eNB and the identifier of the destination eNB, mainly for the source end to know which destination MME the close notification message is sent, and for the MME to know to which the close notification message is sent after receiving the close preparation request, and thus, step 205 is specifically: the eNB1 sends a close preparation request message to a corresponding MME (here, the MME may specifically be an MME connected between the source eNB and the destination eNB) through the S1 interface according to the TAI in the identifier of the eNB1, and the MME forwards the close preparation request message to the eNB2 according to the TAI in the identifier of the eNB 2.

In step 206, the eNB2 determines whether the current available resources of the cell 2 controlled by the eNB2 meet the resources carried by the close preparation request, and if so, sends a success response to the eNB1, and then executes step 207; otherwise, a failure response is sent to the eNB 1.

For example, if the resource information carried by the close preparation request is a resource with a size of 128M, the current available resource of the cell 2 in this step 206 is at least a resource with a size of 128M. Preferably, the failure response sent in step 206 when the determination result is negative may include a reason of the failure, such as that the destination cell cannot currently provide the resource carried by the close preparation request message. In this embodiment, when the determination result in step 206 is negative, one or more cells may be continuously selected from other cells having an overlapping coverage relationship with the cell 1 except the cell 2 in step 202 as the target cell to which the current load in the cell 1 needs to be switched, and then the step 203 may be executed again. Accordingly, the illustration in FIG. 2 is for exemplary purposes only and is not intended to limit the application of embodiments of the present invention.

It should be noted that, the step 205 and the step 206 may be a new process, and may also be implemented in an existing resource state initialization process or another process X2 process or S1 process, which is not limited in the embodiment of the present invention.

Step 205 and step 206 are closing preparation negotiation procedures, which are optional steps in the present invention, and the closing pass-through procedure of step 207 may be directly performed without this procedure.

In step 207, the eNB1 sends a close notification message to the neighboring base stations.

Here, the close notification message carries the identifier of the cell 1 to be closed (which may be ECGI: E-UTRAN cell global identifier or PCI: physical cell identifier) and the identifier of the cell 2 to which the cell 1 is handed over (denoted as information 1).

In this step, if it is case 1, directly sending a close notification message to the adjacent base station through the X2 interface; if the case 2 is true, the shutdown notification message carries, in addition to the information 1, an identifier of the source eNB, that is, eNB1, and an identifier of the destination eNB, that is, an eNB adjacent to the eNB1 (denoted as information 2), then step 207 specifically includes: the eNB1 sends a close notification message to the corresponding MME through the S1 interface according to the selected TAI1, and the MME forwards the close notification message to the target eNB according to the selected TAI 2. Step 207 may be performed in either or both of cases 1 and 2 in the present embodiment.

Preferably, in this embodiment, if it is the case 1, the specific implementation of the close notification message in step 207 may have various forms, including but not limited to the following three types: (1) a predefined message containing information 1. Wherein the message conforms to a communication protocol. (2) And extension of existing handover requests. Such as: a field for carrying information 1 and a field for adding a cell operation state are added in an existing handover request, where a value of the cell operation state may include a first value for performing an operation of opening a cell and a second value for performing an operation of closing the cell, and here, since the eNB1 has determined that the cell needs to be closed, the value of the cell operation state is the second value for performing the operation of closing the cell. (3) The existing eNB configures extensions of the update message. The operation of the specific extension is similar to the extension of the existing handover request, and is not described herein again.

If it is the case 2, the closing notification message in step 207 may be implemented in various forms, including but not limited to the following four types: (1) a predefined message containing information 1 and information 2. (2) And extension of existing handover requests. Such as: the fields of information 1 and information 2 and the field of the cell operation state are added in the existing handover request message, where the value of the cell operation state may include a first value for performing an operation of opening a cell and a second value for performing an operation of closing the cell, and here, since the eNB1 has determined that the cell needs to be closed, the value of the cell operation state is the second value for performing the operation of closing the cell. (3) The existing eNB configures extensions of the update message. The operation of the specific extension is similar to the extension of the existing handover request, and is not described herein again. (4) And expanding the eNB state transfer message. The operation of the specific extension is similar to the extension of the existing handover request, and is not described herein again. Here, if the eNB state transition message is sent to the MME by the eNB1, it may specifically be: eNB configures a message in a transfer process or eNB direct information transfer; if the MME is sent to the eNB, it may specifically be: MME configures messages in the transfer procedure or MME direct information transfer.

In step 208, the base station adjacent to eNB1 updates the state corresponding to the identifier of cell 1 in the proximity relation list to the off state, and stops switching the terminal to cell 1 until cell 1 is turned on again.

Here, the state of the cell may be added to the information of the cell corresponding to the identifier of the cell 1 in the proximity relation list, and the value of the state includes on and off. In order to update the state of the cell and make the state selectable, the state may be made to be a value indicating an open state by default, and when the step 208 is executed, since the eNB1 performs an operation of closing the cell controlled by the eNB, the state is made to be a value indicating a closed state. This allows to modify only the state of cell 1 without changing the state of other serving cells as well as neighboring cells.

In step 209, the base station adjacent to the eNB1 transmits a close response message to the eNB 1.

Here, if the present embodiment adopts case 1, each base station adjacent to the eNB1 in this step 209 directly transmits a close response message (corresponding to the close notification message in step 207) to the eNB1 through the corresponding X2 interface; if it is case 2, each base station neighboring the eNB1 directly transmits a close response message to the MME connected between itself and the eNB1 through the corresponding S1 interface, and the close response message is forwarded by the MME to the eNB 1.

It should be noted that, in the present embodiment, step 209 may not be executed, but step 210 is directly executed.

At step 210, eNB1 turns off the transmission for cell 1. The shutdown here may be to simply shut down the transmission and/or reception of the air interface.

Thus, the operation of closing the cell in the open state provided by the embodiment of the present invention is realized through the above steps.

The above is a brief description of the operation of turning off the cell provided by the embodiment of the present invention, and the present invention is described below with reference to a few specific application embodiments. In the method of the present invention, before the shutdown notification of fig. 3 to fig. 8 is executed, optionally, the shutdown negotiation process of step 205 and step 206 may also be executed.

Referring to fig. 3, fig. 3 is a first flowchart provided in embodiment 1 of the present invention. The enbs in this embodiment interact with each other through an X2 interface. In addition, the present embodiment takes the closing notification message as an example, specifically, the closing notification message is a handover request. As shown in fig. 3, the process may include the following steps:

in step 301, the eNB1 receives a measurement report from the UE.

In step 302, the eNB1 decides to temporarily switch off one or several cells currently in its control and in the on state based on the received measurement reports.

Here, the specific operations of deciding to close the cell in step 302 and determining to close the destination cell corresponding to the cell are described with reference to step 201 and step 202 in fig. 2. For convenience of description, the cell determined to be turned off is referred to as cell 1, and a target cell corresponding to the determined cell 1, for example, cell 2, is referred to as a cell controlled by an eNB adjacent to eNB 1.

In step 303, the eNB1 sends a handover request to eNB2 over the X2 interface to inform eNB2 that cell 1 is ready to be turned off.

Here, the handover request is a specific message of the close notification message in step 205 in fig. 2, and includes the cell identifier of the source cell, i.e., cell 1, and also includes the identifier of the destination cell.

According to the above description of step 205, in this step 303, when the eNB1 notifies the eNB2 of the turn-off of the cell 1 through the handover request, there are two specific methods: one method is to add a field of a cell operation state in a switching request and set a value of the cell operation state as a second value for executing cell closing operation; another method is to add handover reasons to the handover request, where the handover reasons are: the cell is closed and the handover cause value is set to a second value for performing the operation of closing the cell.

It should be noted that, in the embodiment, the handover request may further include a time for preparing to close the cell.

In step 304, the eNB2 updates the state corresponding to the identifier of the cell 1 carried in the handover request in the neighbor relation list, and updates the state to the off state.

Here, the eNB2, upon receiving the handover request, if it determines that the eNB1 needs to turn off the cell such as cell 1,

stopping switching the UE to the cell 1 until the cell 1 is opened next time; or,

if the handover request carries the time to prepare to close the cell, the handover of the UE to cell 1 is stopped at any time after the time that eNB1 prepares to close the cell until the next time cell 1 is turned on.

In step 305, the eNB2 sends a handover request acknowledgement to the eNB 1.

Here, the handover request in step 303 may also carry the size of the resource currently required to be provided by the cell 2; thus, in this step 305, the eNB2 determines whether there is currently available resource with the resource size carried in the handover request in the cell 2, and if so, sends a handover request acknowledgement to the eNB 1; if not, namely, it is determined that no available radio resource is available to provide service for the load in the cell 1, the eNB2 sends a handover preparation failure message to the eNB1, sets a cause value as that the target cell, namely, the cell 2, does not have available radio resource, and ends the handover process; thereafter, the eNB1 decides whether to continue to perform the cell closing procedure according to whether there are other neighboring cells, for example, if there are other available cells and it is determined that the available cell signals are good enough according to the measurement report sent by the UE in cell 1, the available cell may be determined as the destination cell, and the procedure returns to step 302; otherwise, eNB1 stops the shutdown procedure for cell 1.

In step 306, the eNB1 sends a handover command to the UE.

Here, the handover command includes a target cell to which the UE needs to be handed over, i.e., cell 2. Thus, the terminal can perform cell handover.

Step 307, after the UE completes the cell handover, the UE sends a handover complete message to the eNB 2.

It should be noted that, since the corresponding path needs to be changed after the terminal performs the cell handover, the following path handovers from step 308 to step 309 need to be performed in order to manage the path.

In step 308, eNB2 sends a path switch request message to the MME.

The MME here contains the S-GW or PDNGW (the procedures between the MME and the S-GW and PDNGW are omitted).

In step 309, the MME sends a path switch request acknowledge message to eNB 2.

Here, the specific operations in step 306 to step 309 may be similar to the path switching in the prior art, and are not described herein again.

In step 310, the eNB2 sends a release resource message to the eNB 1.

In step 311, the UE performs a routing area update procedure. The specific operation in step 311 may be similar to the path switching in the prior art, and is not described herein again.

Cell 1 may be turned off after eNB1 has successfully handed over active mode UEs in cell 1 to other cells.

Thus, the first process provided by the embodiment of the present invention is realized. It can be seen that the flow shown in fig. 3 is a handover request triggered by the base station to which the cell to be turned off belongs. Preferably, in this embodiment, when the eNB1 decides to close a cell, if a current base station, such as the eNB2, determines that it is necessary to handover the UE to a cell to be closed controlled by the eNB1 according to a measurement report sent by the UE, the corresponding procedure may refer to the second flowchart provided in embodiment 1 of the present invention shown in fig. 4. As shown in fig. 4, the process may include the following steps:

in step 401, the eNB1 decides to switch off a certain cell or cells.

Here, the specific operations of deciding to close the cell in step 401 and determining to close the destination cell corresponding to the cell are described with reference to step 201 and step 202 in fig. 2. For convenience of description, the cell determined to be turned off is referred to as cell 1, and a target cell corresponding to the determined cell 1, for example, cell 2, is referred to as a cell controlled by an eNB adjacent to eNB 1.

In step 402, the eNB2 receives a measurement report sent by a UE in a cell it controls.

In step 403, the eNB2 decides to handover the UE to a cell in the eNB1 based on the measurement report, and the eNB2 sends a handover request to the eNB1 over the X2 interface.

Here, the handover request carries the identity of the destination cell.

In step 404, the eNB1 sends a handover preparation failure message to the eNB2 when determining that the identifier of the target cell carried by the handover request is the identifier of the cell 1 to be closed.

Here, the handover preparation failure message may carry a failure cause value, which may be made cell preparation off here. Optionally, the handover preparation failure message may further include a time for preparing to close the cell; of course, if the eNB1 determines that the identifier of the destination cell carried by the handover request is not the identifier of the cell 1 to be closed, it sends a handover request acknowledgement message to the eNB 2.

In step 405, the eNB2 updates the state of the cell 1 in the neighbor relation list to be the off state, and stops switching the UE to the cell 1 until the cell 1 is turned on next time.

Here, eNB2 stops handing over UEs to cell 1 after the time that eNB1 prepares to turn off the cell, and for the time that the cell is turned off, until cell 1 is turned on next time.

Thus, the second flowchart provided by the embodiment of the present invention is realized by the above operations. It can be seen that the flow shown in fig. 4 is a handover request sent by a base station other than the base station to which the cell to be closed belongs.

Both the above-mentioned two procedures are to notify the neighboring base station cell to be closed by taking a handover procedure as an example, preferably, this embodiment may also employ a newly defined close notification message to notify the neighboring base station cell to be closed, specifically referring to fig. 5. Fig. 5 is a third flowchart provided in embodiment 1 of the present invention. As shown in fig. 5, the process may include the following steps:

in step 501, eNB1 decides to switch off a cell. Here, the specific operations of deciding to close the cell in step 501 and determining to close the destination cell corresponding to the cell are described with reference to step 201 and step 202 in fig. 2. For convenience of description, the cell determined to be turned off is referred to as cell 1, and a target cell corresponding to the determined cell 1, for example, cell 2, is referred to as a cell controlled by an eNB adjacent to eNB 1.

In step 502, the eNB1 sends a close notification message to eNB 2.

Here, the closing notification message may include a cell identifier of a cell to be closed, and optionally, the message may further include a time for preparing to close the cell.

Here, the eNB2 in step 502 may be a set of base stations adjacent to the eNB 1; or may be the base station to which the destination cell corresponding to the cell to be turned off in step 501 belongs.

In step 503, eNB2 updates the status of cell 1 in the neighbor relation list to the off status.

In step 504, the eNB2 sends a close response message to the eNB 1.

Here, step 504 is an optional operation and may not be performed.

Cell 1 may be turned off if there are no active mode UEs in cell 1 from eNB1 or if active mode UEs in cell 1 are successfully handed over to other cells from eNB 1.

The above is an example of sending the close message between the base stations through the X2 interface, and the close message may also be sent between the base stations through the S1 interface in the embodiment of the present invention. This is described below.

Referring to fig. 6, fig. 6 is a fourth flowchart provided in the present embodiment 1. The process may specifically have a certain corresponding relationship with the process of fig. 3, and the difference is that in fig. 3, the base stations interact with each other through an X2 interface, and in this process, the base stations interact with each other through an S1 interface, as shown in fig. 6, the process may include the following steps:

in step 601, eNB1 decides to initiate a handover procedure of the UE according to the measurement report of the UE.

Here, the step 601 specifically determines to initiate the handover procedure of the UE as follows: the specific operations of the procedure for deciding to close the cell and determining to close the destination cell corresponding to the cell are described with reference to step 201 and step 202 in fig. 2. For convenience of description, the cell determined to be turned off is taken as cell 1, and the target cell corresponding to the determined cell 1, for example, cell 2, is taken as a cell controlled by an eNB adjacent to eNB1, for example, eNB 2.

In step 602, eNB1 sends a handover request to the MME.

Here, the handover requirements carry the identity of cell 1. There are two methods for the eNB1 to notify the eNB2 of the cell 1 to be turned off through the handover requirement in step 602, which are similar to the description in step 303 and will not be described in detail here. Preferably, in order to facilitate forwarding of the handover requirement, the handover requirement further carries an identifier of the source base station, i.e. eNB1, and an identifier of the destination base station, here, taking the destination base station as eNB2 as an example, step 603 is executed.

In step 603, the MME sends a handover request to eNB 2.

The handover request in this step 603 is the same as the identifier carried by the handover requirement in step 602.

In step 604, eNB2 updates the state of cell 1 in the neighbor relation list to be an off state, and stops switching the UE to cell 1 until cell 1 is turned on next time.

Here, if the handover request carries the time to prepare for closing the cell, the handover of the UE to the cell 1 is stopped at any time after the time when the eNB1 prepares for closing the cell until the cell 1 is turned on next time.

In step 605, eNB2 sends a handover request acknowledgement to the MME.

In step 606, the MME sends a handover command message to eNB 1.

In step 607, the eNB1 sends a handover command message to the UE.

In step 608, after the UE completes the cell handover, the UE sends a handover confirm message to the eNB 2.

In step 609, eNB2 sends a handover notification message to the MME.

It should be noted that the above steps 605 to 609 may be similar to the cell handover procedure, and are not detailed here, and then the MME informs the eNB1 that the resources of the cell 1 may be released, so that the eNB1 releases the resources of the cell 1.

In this embodiment, when the eNB1 decides to close a cell, if there is a base station, such as the eNB2, currently determining that the UE needs to be handed over to a cell to be closed controlled by the eNB1 according to a measurement report sent by the UE, the corresponding procedure may refer to a fifth flowchart provided in embodiment 1 of the present invention shown in fig. 7. The process may specifically have a certain correspondence with the process of fig. 4, and the difference is that in fig. 4, the base stations interact with each other through an X2 interface, and in the present process, the base stations interact with each other through an S1 interface. As shown in fig. 7, the process may include the following steps:

in step 701, the eNB1 decides to switch off one or several cells.

Here, the specific operations of deciding to close the cell in step 701 and determining to close the destination cell corresponding to the cell are described with reference to step 201 and step 202 in fig. 2. For convenience of description, the cell determined to be turned off is referred to as cell 1, and a target cell corresponding to the determined cell 1, for example, cell 2, is referred to as a cell controlled by an eNB adjacent to eNB 1.

In step 702, the eNB2 sends a handover request to the MME.

Here, the handover requirements carry the identity of the destination cell. Preferably, in order to facilitate MME forwarding, the identity of the base station to which the destination cell belongs and the identity of eNB2 are also carried in the handover requirement. Here, taking the base station to which the target cell belongs as eNB1 as an example, step 703 is executed.

In step 703, the MME sends a handover request message to eNB 1.

In step 704, the eNB1 sends a handover preparation failure message to the MME when determining that the identifier of the destination cell carried in the handover request is the identifier of the cell 1 to be closed.

The handover preparation failure message carries a failure cause value, which may be made cell preparation shutdown. Optionally, the handover preparation failure message may further include a time for preparing to close the cell; of course, if the eNB1 determines that the identifier of the destination cell carried by the handover request is not the identifier of the cell 1 to be closed, the eNB sends a handover request acknowledgement message to the MME.

In step 705, the MME sends a handover preparation failure message to eNB 2.

In step 706, eNB2 updates the state of cell 1 in the neighbor relation list to off, and stops switching the UE to cell 1 until cell 1 is turned on next time.

Here, if the time to prepare to close the cell is included in the handover preparation failure message, the eNB2 stops the handover of the UE to the cell 1 until the next time the cell 1 is turned on after the time to prepare to close the cell by the eNB1 and within the time to close the cell.

Both the above-mentioned two procedures are to notify the neighboring base station cell to be closed by taking a handover procedure as an example, preferably, the embodiment may also employ an eNB state transition message to notify the neighboring base station cell to be closed, specifically referring to fig. 8. Fig. 8 is a sixth flowchart provided in embodiment 1 of the present invention. As shown in fig. 8, the process may include the following steps:

in step 801, the eNB1 decides to switch off a cell.

Here, the specific operations of deciding to turn off the cell in step 801 and determining to turn off the destination cell corresponding to the cell are described with reference to step 201 and step 202 in fig. 2. For convenience of description, the cell determined to be turned off is referred to as cell 1, and a target cell corresponding to the determined cell 1, for example, cell 2, is referred to as a cell controlled by an eNB adjacent to eNB 1.

In step 802, eNB1 sends an eNB state transition message 1 to the MME.

Here, the eNB state transition message 1 may be implemented with an existing eNB configuration transition procedure or eNB direct information transition or a new S1 interface message, which may contain an identification of the cell 1 to be turned off, a value of a cell operation state, an identification of a destination eNB (each eNB adjacent to the eNB 1), and an identification of a source eNB.

In step 803, the MME sends eNB state transition message 2 to the destination eNB 2.

Here, the eNB state transition message 2 may be implemented by an existing MME configuration transition procedure, or MME direct information transfer, or a new S1 interface message, and includes the same information as the eNB state transition message 1 in 802.

Step 804, eNB2 updates the state of cell 1 in the neighbor relation list to off, and stops switching UE to cell 1 until cell 1 is turned on next time.

Thus, the cell shutdown operation provided by the embodiment of the present invention is realized through the above operation.

In this embodiment, after the cell is closed, it does not mean that the cell is always in the closed state, and preferably, in this embodiment, the closed cell may also be opened according to an actual situation. The cell opening operation is described below.

Second embodiment:

referring to fig. 9, fig. 9 is a flowchart of a second embodiment of the present invention. In this embodiment, the switching from the cell off state to the cell on state is taken as an example for description, and as shown in fig. 9, the process may include the following steps:

step 901, eNB1 determines whether it needs to open the cell controlled by it and closed currently, if yes, executes step 902; otherwise, the flow ends.

Here, the specific implementation of the determination in step 901 may have various implementation forms, such as:

the first mode is as follows: the eNB1 determines whether the load of each cell currently controlled by the eNB exceeds a preset threshold, if so, determines that the cell is overloaded, and in order to ensure the quality of service provided by the cell, the eNB1 opens a closed cell controlled by the eNB, which has a coverage relationship with the cell, and the closed cell shares a part of the load after opening. That is, the eNB1 may determine that the closed cell needs to be opened currently when it is determined that the load of the cell exceeds the preset threshold; otherwise, it may be determined that the closed cell does not currently need to be opened.

The second mode is as follows: the eNB1 determines whether an open request message sent by a neighboring base station, such as eNB3, is currently received, where the open request message carries an identifier of a closed cell controlled by eNB1 and having a coverage relationship with the cell, which is determined by eNB3 when determining that the current load of the cell controlled by the cell in an open state is higher than a set threshold; if so, determining that a cell controlled by the eNB1 in an off state needs to be opened; otherwise, it is determined that the cell controlled by the eNB1 in the off state does not need to be opened.

The open request message may be a predefined new message, or may be an extension of an existing message, such as a handover request. If the message is an extension of the existing message, the method specifically comprises the following steps: adding a field for judging the identity of a closed cell controlled by the eNB1 and having a coverage relation with the cell determined when the current load of the cell controlled by the cell in an open state is higher than a set threshold value into an existing message, and adding a field for carrying a cell operation state, wherein the value of the cell operation state at least comprises a request to open, open and close, wherein the value of the cell operation state is the request to open because the eNB3 requests the eNB1 to open the cell. For example, if the cell operation state is a request to open, after the opposite terminal, such as eNB1, receives a message carrying a cell state value, it knows that the message is a cell corresponding to a cell identifier that the opposite terminal, such as eNB1, requests to open, and thus, the opposite terminal, such as eNB1, performs a corresponding operation according to the cell operation state.

It can be seen that the two main differences are: the first is that eNB1 itself actively triggers the turning on of the closed cells it controls; the second is that eNB1 passively turns on its controlling closed cell by the triggering of the neighboring base station. The embodiment of the invention can execute any one or combination of the two modes according to the actual situation.

In step 902, the eNB1 sends an open notification message to its neighboring base stations.

Here, the open notification message carries the identity of the cell to be opened.

It should be noted that, if it is the case 1, the eNB1 directly sends the open notification message to the neighboring base stations through the X2 interface. Fig. 2 in the first embodiment is an example of case 1, and fig. 9 is an example of case 2.

If the case 2 is, in addition to the identifier of the cell to be opened, the above-mentioned opening notification message also carries the identifier of the source eNB, that is, eNB1, and the identifier of the destination base station, that is, the eNB adjacent to eNB1, where the source eNB identifier includes the global identifier of the source eNB and the selected TAI1 (mainly used for identifying the route between the source eNB and the MME connected between the source eNB and the destination eNB), and the identifier of the destination eNB includes the global identifier of the destination eNB and the selected TAI2, specifically, step 902a shown in fig. 9, eNB1 sends the opening notification message to the corresponding MME (here, the MME may specifically be an MME connected between the source eNB and the destination eNB) through the S1 interface according to the selected TAI1, and step 902b, the MME forwards the opening notification message to the destination eNB according to the selected TAI 2.

Preferably, when the open notification message in this embodiment is implemented, there may be a plurality of implementation forms, such as: (1) a predefined message. Wherein the message conforms to a communication protocol. (2) And extension of existing handover requests. The method specifically comprises the following steps: adding a field for bearing an identifier of a cell to be opened and a cell operation field in an existing handover request, wherein the value of the cell operation state can comprise a first value for executing cell opening operation and a second value for executing cell closing operation, and the value of the cell operation state can be the first value for executing cell opening operation because the cell is opened; of course, if it is case 2, it is also necessary to add fields for carrying the identity of the source eNB and the identity of the destination eNB. (9) The existing eNB configures extensions of the update message. The operation of the specific extension is similar to the extension of the existing handover request, and is not described herein again. Of course, in case 2, the open notification message may also be an extension of the eNB state transition message, except for the above three forms, and the specific extension operation is similar to the extension of the existing handover request, and is not described herein again.

In step 909, each eNB adjacent to eNB1 updates the status corresponding to the identifier of the cell to be opened in the proximity relation list to the open status.

Here, the state of the cell may be added to the information of the cell corresponding to the cell identifier to be opened, and the value of the state includes opening and closing. In order to update the state of the cell and make the state selectable, the state of the cell is made open because the cell is opened. In this way, it is possible to realize that only the state of the cell to be opened is updated without changing the states of other cells and neighboring cells.

In step 904, each eNB adjacent to eNB1 sends an open response message to eNB 1.

It should be noted that step 904 may not be executed, but when it is determined in step 901 that the cell needs to be opened, the time for opening the cell is set, and thus when the set time is reached, step 905 is directly executed. Alternatively, when it is determined in step 901 that the cell needs to be opened, step 905 is directly performed.

In step 905, eNB1 opens a cell to be opened.

Thus, the cell opening process provided by the embodiment of the invention is realized through the steps.

For convenience of understanding, a specific procedure of cell opening provided in the embodiment of the present invention is described below.

Referring to fig. 10, fig. 10 is a first flowchart provided in embodiment 2 of the present invention. In this embodiment, enbs interact with each other through an X2 interface. In addition, in this embodiment, taking the second manner described in step 901 in fig. 9 as an example, as shown in fig. 10, the process may include the following steps:

step 1001: the eNB2 decides to trigger the opening procedure of the neighboring cell.

Here, step 1001 may refer to the second manner described in step 901. Here, the eNB2 decides that the triggered neighbor cell is the turned-off cell 1 belonging to the eNB 1.

Here, the open procedure in step 1001 specifically includes the eNB2 sending an open request message to the eNB 1.

Here, the open request message contains the identity of the cell that the eNB2 requests to open.

In step 1002, the eNB1 opens the cell corresponding to the cell identifier carried in the open request message.

In step 1003, the eNB1 sends an open response message to the eNB 2.

Here, step 1003 is an optional operation, and step 1003 may not be executed in this embodiment.

It should be noted that, in the present invention, how to trigger the opening of the cell in the neighboring base station is independent from the process of triggering the closing of the cell in the neighboring base station, and the manner of requesting the opening in this embodiment may be applicable regardless of which closing manner is adopted in the first embodiment.

The above-mentioned flow described in fig. 10 is exemplified by the eNB1 passively turning on the closed cell it controls by the trigger of the neighboring base station, here, the eNB1 itself may also actively trigger turning on the closed cell it controls, see fig. 11 specifically. Referring to fig. 11, fig. 11 is a second flowchart provided in embodiment 2 of the present invention. In this embodiment, enbs interact with each other through an X2 interface. In addition, in this embodiment, taking the first manner described in step 901 in fig. 9 as an example, as shown in fig. 11, the process may include the following steps:

step 1101: eNB1 triggers the opening procedure of the cell it controls.

Here, step 1101 may refer to the first manner described in step 901. Here, the eNB1 determines that the triggered neighboring cell is the cell 1 belonging to itself and turned off.

Step 1102: the eNB1 sends an open notification message to eNB 3.

Here, the open notification message includes the identification of the cell 1 to be opened. Among them, eNB3 is a set of base stations neighboring eNB 1.

In step 1103, the eNB3 updates the state corresponding to the cell identifier carried in the opening notification message in the proximity relation list to an open state.

Thereafter, the eNB3 may handover the UE to the cell corresponding to the cell identifier carried in the open notification message.

Optionally, after step 1103, the eNB3 may also send an open response message to the eNB 1.

In the above, the base stations send the open notification message through the X2 interface as an example, in the embodiment of the present invention, the base stations may also send the open notification message through the S1 interface. This is described below.

Referring to fig. 12, fig. 12 is a third flowchart provided in embodiment 2. The process may specifically have a certain correspondence with the process of fig. 10, and the difference is that in fig. 10, the base stations interact with each other through an X2 interface, and in the present process, the base stations interact with each other through an S1 interface. As shown in fig. 12, the process may include the following steps:

in step 1201, eNB1 decides to trigger a neighboring eNB to open a cell. Here, step 1201 may specifically refer to the second manner described in step 901. Here, the eNB1 decides that the triggered neighboring cell is the turned-off cell 2 belonging to the eNB 2.

In step 1202, eNB1 sends an eNB state transition message 1 to the MME.

Here, the eNB state transition message 1 may be implemented with an existing eNB configuration transition procedure or eNB direct information transition, which may include an identification of a cell to be opened, a value of a cell operation state, an identification of a destination eNB (each eNB adjacent to the eNB 1), and an identification of a source eNB.

In step 1203, the MME sends eNB state transition message 2 to eNB 2.

Here, the eNB state transition message 2 may be implemented by an existing MME configuration transition procedure or MME direct information transition, and includes the same information as the eNB state transition message 1 in 802.

In step 1204, the eNB2 opens the cell corresponding to the identifier carried in the eNB state transition message 2.

Thus, the cell opening operation provided by the embodiment of the present invention is realized through the above operation.

It should be noted that, because the eNB generally controls more than one cell, if it is determined in step 201 in the first embodiment that the current loads of multiple cells are all lower than the set threshold, or it is determined in step 901 in the second embodiment that multiple cells need to be opened, the embodiments of the present invention may perform the closing or opening operation on each cell in no order. Preferably, in the embodiment of the present invention, a closing priority and an opening priority may also be set for each cell in advance, and a closing operation or an opening operation is performed on each cell in sequence according to the order of the priorities. Taking the closing operation as an example, the specific implementation includes: setting a total threshold value of cells with overlapping coverage relation, and then setting corresponding threshold values for all the cells; thus, step 201 may be replaced with: the eNB1 determines whether the current total load of the cell controlled by the eNB1 in an open state and other cells in an open state (which may be controlled by the eNB1 or by an eNB adjacent to the eNB1, but is not limited herein) in an overlapping coverage relationship with the cell, if so, continues to determine whether the current load of the cell controlled by the eNB is lower than a set threshold, and if so, determines that the cell needs to be closed, and performs step 202; and when the current total load is not lower than the set total threshold value or the current load of the cell is not lower than the set threshold value, maintaining the opening state of the cell. If the eNB1 determines in step 201 that there are three cells, namely cell 1, cell 2, and cell 3, controlled by the eNB1 in an open state and the current load of which is lower than the set total threshold, if the threshold of each cell sequentially increases, the eNB1 sequentially performs the closing operation on the cell 1, cell 2, and cell 3. The specific implementation of the opening operation is similar to the closing operation described above.

Wherein, the threshold value of each eNB controlled cell and the total threshold value of the cells with overlapping coverage relation can be configured by O & M; then, the O & M transmits the configured shutdown priority of each cell to the eNB to which it belongs. Or, the O & M configures a total threshold value of the cells with the overlapping coverage relation, the O & M sends the configured total threshold value of the cells with the overlapping coverage relation to the eNB to which each cell with the overlapping coverage relation belongs, and then, each base station sets a corresponding threshold value for each cell controlled by each base station according to the load of the cell controlled by each base station and according to a ping-pong principle of avoiding the closing of the cell, wherein the threshold value of the cell with the overlapping coverage relation is smaller than the total threshold value configured by the O & M. Or the O & M configures the threshold range, and each base station sets a corresponding threshold value for each cell controlled by the base station according to the load of the cell controlled by the base station and the ping-pong principle caused by avoiding the cell closing. In practical application, the setting may be performed according to practical situations, and the embodiment of the present invention is not limited. Then, the interaction of the thresholds of the cells under the control of each base station is specifically as follows: the eNB1 sends an X2 configuration message to the eNB2, where the message at least includes information of a serving cell of a target eNB, that is, eNB2, where the information of the serving cell includes an identifier of the serving cell, and a cell closing or opening threshold of the serving cell; preferably, the message further includes information of the neighboring cell, and the information of the neighboring cell includes an identifier of the neighboring cell and a closing or opening threshold value of the neighboring cell; the eNB2 sends an X2 configuration reception message to the eNB1, where the message includes an identifier of a target eNB and information of a serving cell, where the information of the serving cell includes the identifier of the serving cell, and a cell closing or opening threshold value of the serving cell; preferably, the message further includes information of the neighboring cell, and the information of the neighboring cell includes an identifier of the neighboring cell and a closing or opening threshold value of the neighboring cell.

The method provided by the embodiment of the present invention is described in detail above, and the system provided by the embodiment of the present invention is described below.

Referring to fig. 13, fig. 13 is a system structure diagram provided in the embodiment of the present invention. As shown in fig. 13, the system includes a first base station 1301 and a second base station 1302; the second base station 1302 is a base station adjacent to the first base station 1301;

the first base station 1301 determines whether the current state of the cell controlled by the first base station needs to be switched to another state opposite to the current state, and if so, sends a cell state notification to the second base station 1302; the cell state notification carries the identification of the cell to be switched;

the second base station 1302 updates the state corresponding to the cell identifier carried in the cell state notification in the proximity relation list.

Preferably, the first base station 1301 and the second base station 1302 are connected through a corresponding X2 interface; or through the core network via the S1 interface.

Correspondingly, an embodiment of the present invention further provides a schematic structural diagram of a base station, as shown in fig. 14, where the base station includes: a control unit 1401, a judgment unit 1402, and a transmission unit 1403;

wherein, the control unit 1401 is used for controlling the cell;

the judging unit 1402 is configured to judge whether the current state of the cell controlled by the control unit 1401 needs to be switched to another state opposite to the current state;

a transmitting unit 1403 is used for transmitting a cell state notification to a base station adjacent to the determining unit 1402 when the determining result of the determining unit 1402 is yes; the cell state notification carries the identification of the cell to be switched.

Preferably, the base station in this embodiment has different structures in different situations:

if the current state is an open state and the other state opposite to the current state is a structure in the closed state, the determining unit 1402 determines, for each cell controlled by the controlling unit and in the open state, whether the current load of the cell is lower than a set threshold, and if so, determines that the state of the cell needs to be switched to the closed state;

the transmission unit 1403 includes: a determining sub-unit 14031 and a sending sub-unit 14032.

Wherein the determining subunit 14031 is configured to determine a destination cell that serves the current load of the cell to be turned off;

the sending subunit 14032 is configured to send a cell status notification to the base stations neighboring to the destination cell if there is currently available resource in the destination cell that meets the current load requirement of the cell that needs to be turned off.

As shown in fig. 14, the apparatus further includes: a first receiving unit 1404;

a first receiving unit 1404 receives a handover request sent by another base station, where the handover request carries an identifier of a destination cell to be handed over by a terminal in a cell controlled by the other base station;

the determining unit 1402 determines whether the identifier of the target cell carried by the handover request is an identifier of a cell to be closed, and if so, sends a handover failure message to another base station; the handover failure message carries a value indicating that the cell is ready to be closed and an identity of the cell to be closed.

Preferably, if the first receiving unit 1404 receives a handover failure message sent by another base station, where the handover failure message carries a value indicating that a cell is ready to be closed and an identifier of a cell to be closed, or receives a cell state notification sent by another base station, where a value of a cell operation state in the cell state notification is a second value for performing a cell closing operation, update a state corresponding to the identifier of the cell carried by the handover failure message or the identifier of the cell carried by the cell state notification in the proximity relationship list to be a closed state, and stop switching the terminal to the cell to be closed until the cell to be closed is opened again.

Preferably, if the current state is an off state, the other state opposite to the current state is an on state; the judging unit 1402 judges whether the current load of each cell controlled by the control unit 1401 and in the open state is higher than a set threshold, and if so, determines that a cell controlled by itself and having a coverage relation with the cell needs to be opened and closed; otherwise, determining that the closed cell controlled by the cell and having a coverage relation with the cell does not need to be opened; or

Judging whether an opening request message sent by an adjacent base station is received currently, wherein the opening request message carries an identifier of a closed cell controlled by a first base station and having a coverage relation with the cell when the adjacent base station judges that the current load of the cell controlled by the adjacent base station in an open state is higher than a set threshold value; if yes, determining that the cell controlled by the cell is required to be opened and is in a closed state; otherwise, it is determined that the cell controlled by itself in the off state does not need to be opened.

The invention also provides other base station structure modes, which are not shown in the attached drawings of the specification and are described only by characters:

mode 1:

in this mode 1, the base station may have a configuration including:

a handover request sending unit, configured to send a handover request message to an adjacent base station, where the handover request message carries a handover reason, and the handover reason is information that a first base station wants to close a cell;

a handover request acknowledgement receiving unit, configured to receive a handover request acknowledgement message sent by a neighboring base station.

This completes the description of mode 1.

Mode 2:

in this embodiment 2, the base station may have a configuration including:

a handover request message receiving unit, configured to receive a handover request message sent by an adjacent base station, where the handover request message carries a handover reason, and the handover reason is information that the adjacent base station needs to close a cell;

and the switching request confirmation sending unit is used for sending a switching request confirmation message to the adjacent base station.

This completes the description of mode 2.

Mode 3:

in embodiment 3, the base station may have a configuration including:

a handover request message receiving unit, configured to receive a handover request message sent by a neighboring base station, where a target cell included in the handover request message is a cell to be closed;

and the switching failure determining unit is used for sending a switching failure message to the adjacent base station, wherein the switching failure message carries the reason of failure.

This completes the description of mode 3.

Mode 4:

in embodiment 4, the base station may have a configuration including:

a handover determining unit for sending a handover request message to an adjacent base station;

and a handover failure message receiving unit, configured to receive a handover failure message sent by the neighboring base station, where the handover failure message includes information that a reason for the failure is to be closed by a target cell.

This completes the description of mode 4.

Thus, the description of the structure of the base station provided by the present invention is completed.

It can be seen from the above technical solutions that, in the method, system and base station for implementing self-optimization in a mobile communication system provided by the present invention, a first base station determines whether a current state of a cell controlled by the first base station needs to be switched to another state opposite to the current state, where the current state is an open state and the another state opposite to the current state is a closed state; or, the current state is a closed state, and the other state opposite to the current state is an open state; if yes, sending a cell state notice to the adjacent base station; the cell state notification carries the identification of the cell to be switched; and the base station adjacent to the first base station updates the state corresponding to the cell identifier carried by the cell state notification in the adjacent relation list. It can be seen that the mode provided by the present invention enables the network to automatically adjust the capacity and coverage after the self-configuration in the prior art, thereby achieving the purposes of saving power and reducing interference.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A method for implementing self-optimization in a mobile communication system, the method comprising:

a first base station sends a switching request message to a second base station, wherein the switching request message carries a switching reason, and the switching reason is information that the first base station needs to close a cell;

and the first base station receives a switching request confirmation message sent by the second base station.

2. The method of claim 1, wherein sending a handover request message from the first base station to the second base station comprises:

the first base station sends a switching request message to a second base station through an X2 interface between the first base station and the second base station; or,

the first base station sends a switching demand message to an MME connected with the first base station through an S1 interface, so that the MME sends a switching request message to the second base station.

3. A method for implementing self-optimization in a mobile communication system, the method comprising:

a second base station receives a switching request message from a first base station, wherein the switching request message carries information that the first base station needs to close a cell;

and the second base station sends a switching request confirmation message to the first base station.

4. The method of claim 3, further comprising the step of:

and the second base station does not select the cell to be closed by the first base station when selecting the target cell for subsequent handover.

5. A method for implementing self-optimization in a mobile communication system, the method comprising:

a first base station receives a switching request message sent by a second base station, wherein a target cell contained in the switching request message is a cell to be closed by the first base station;

and the first base station sends a switching failure message to the second base station, wherein the switching failure message carries the reason of failure.

6. The method of claim 5, wherein the reason for the failure is information that a destination cell is to be turned off.

7. A method for implementing self-optimization in a mobile communication system, the method comprising:

the second base station sends a switching request message to the first base station;

the second base station receives a handover failure message from the first base station, the handover failure message containing information that the reason for the failure is that the destination cell is to be turned off.

8. The method of claim 7, further comprising the step of:

9. A base station, comprising:

a handover request message sending unit, configured to send a handover request message to an adjacent base station, where the handover request message carries a handover reason, and the handover reason is information that a first base station wants to close a cell;

a handover request acknowledgement message receiving unit, configured to receive a handover request acknowledgement message sent by a neighboring base station.

10. A base station, comprising:

a handover request message receiving unit, configured to receive a handover request message sent by an adjacent base station, where the handover request message carries information that the first base station wants to close a cell;

and the switching request confirmation message sending unit is used for sending a switching request confirmation message to the adjacent base station.

11. A base station, comprising:

and the switching failure message sending unit is used for sending a switching failure message to the adjacent base station, wherein the switching failure message carries the reason of failure.

12. A base station, comprising:

a handover request message determining unit for transmitting a handover request message to an adjacent base station;

a handover failure message receiving unit, configured to receive a handover failure message sent by the neighboring base station, where the handover failure message includes information that a reason for failure is that a target cell is to be closed.