WO2014154036A1

WO2014154036A1 - Method and device for self- establishing x2 link and base station

Info

Publication number: WO2014154036A1
Application number: PCT/CN2014/070600
Authority: WO
Inventors: 黄崧
Original assignee: 大唐移动通信设备有限公司
Priority date: 2013-03-27
Filing date: 2014-01-14
Publication date: 2014-10-02
Also published as: CN103220821A; CN103220821B

Abstract

A method and device for self-establishing an X2 link and a base station. The method comprises: a target base station receiving a request message of establishing an X2 link which is sent by a source base station, the request message containing an SCTP stream identifier of the source base station; the target base station judging whether a preset SCTP stream identifier is consistent with the SCTP stream identifier of the source base station; if yes, the target base station generating a response message of the X2 link according to the preset SCTP stream identifier; otherwise, the target base station generating a response message of the X2 link according to the SCTP stream identifier of the source base station; and the target base station returning the response message of the X2 link to the source base station. The present application can connect base stations of different manufacturers, establish an X2 link connection between the base stations quickly and optimize a network quickly.

Description

Method, device and base station for self-establishing X2 link

This application claims priority to Chinese Patent Application No. 201310102613.1, entitled "A Method, Device and Base Station for X2 Link Self-established", filed on March 27, 2013, the entire contents of which are hereby incorporated by reference. The citations are incorporated herein by reference. Technical field

The present application relates to the field of communications technologies, and in particular, to a method, an apparatus, and a base station for establishing an X2 link. Background technique

The Long Term Evolution (LTE) network is a next-generation mobile wireless access system of 3GPP, including core network equipment and evolved base stations (eNode B, eNB). The core network device communicates with the eNB using the S1 interface, and the eNB uses the X2 interface for communication.

According to the description of 3gpp protocol 36420, The SCTP (IETF RFC 4960 [7]) is used to support the exchange of X2 Application Protocol (X2AP) signalling messages between two eNBs (in SCTP (IETF RFC 4960 [7]) is used to support The X2 application protocol (X2AP, X2 Application Protocol) signaling message is exchanged between the two eNBs. The stream control transmission protocol (SCTP) provides a reliable transmission service for the upper layer X2 application protocol X2AP, for X2-C (letter The establishment of the facet needs to be distinguished by the flow ID in the SCTP layer, which carries the non-UE-associated signaling and the UE-associated signalling.

Referring to FIG. 1 , a schematic diagram of an X2 link self-establishment scenario, where an eNB represents a base station. The base station acquires a cell identifier of the neighboring base station by using a self-configuring network SON receiver;

1. The base station acquires address information of the neighboring base station according to the cell identifier.

2. The base station establishes an X2 link connection with the neighboring base station according to the neighbor base station address information.

The prior art only considers the X2 self-establishment scenario between the base stations of the same manufacturer, so in the X2 Interoperability Test (X2-IOT) scenario of the base station of the different manufacturer base station, The X2 link establishment may be unsuccessful because the flow identifiers of the two parties do not match.

Therefore, one of the problems that a person skilled in the art urgently needs to solve is to provide a method and a device for establishing an X2 link, which can connect base stations of different manufacturers, quickly establish an X2 link connection between base stations, and quickly optimize the network. Summary of the invention

The technical problem to be solved by the present application is to provide a method and a device for establishing an X2 link, which can connect base stations of different manufacturers, quickly establish an X2 link connection between base stations, and quickly optimize the network.

In order to solve the above problem, the present application discloses a method for self-establishing an X2 link, including: receiving, by a target base station, a request message for establishing an X2 link sent by a source base station, where the request message includes an SCTP flow identifier of the source base station. ;

Determining, by the target base station, whether the preset SCTP flow identifier is consistent with the SCTP flow identifier of the source base station;

If yes, the target base station generates a response message of the X2 link according to the preset SCTP flow identifier;

If not, the target base station generates a response message of the X2 link according to the SCTP flow identifier of the source base station;

The target base station returns a response message of the X2 link to the source base station.

Preferably, the step of the target base station generating a response message of the X2 link according to the SCTP flow identifier of the source base station includes:

The target base station modifies the preset SCTP flow identifier according to the SCTP flow identifier of the source base station;

The target base station writes the modified preset SCTP flow identifier into a response message of the X2 link.

Preferably, before the step of determining, by the target base station, whether the preset SCTP flow identifier is consistent with the SCTP flow identifier of the source base station, the method further includes:

Obtaining, by the target base station, an SCTP flow identifier of the source base station in the request message;

Generating, by the target base station, a field carrying an SCTP flow identifier of the source base station;

Determining, by the target base station, a preset SCTP flow identifier and an SCTP flow identifier of the source base station The steps that are consistent include:

The target base station extracts an SCTP flow identifier of the source base station from the field;

The target base station determines whether the preset SCTP flow identifier is consistent with the SCTP flow identifier of the source base station.

Preferably, the target base station modifies the preset according to the SCTP flow identifier of the source base station.

The steps of the SCTP flow identification include:

Obtaining, by the target base station, an SCTP flow identifier of the source base station in the field;

The target base station modifies the preset according to the SCTP flow identifier of the source base station in the field.

SCTP stream identification.

Preferably, the method further includes:

The target base station retains the preset SCTP flow identifier. The embodiment of the present application further discloses an apparatus for self-establishing an X2 link, including: a receiving message module, configured to receive, by a target base station, a request message for establishing an X2 link sent by a source base station, where the request message includes the source base station SCTP flow identifier;

The identifier determining module is configured to determine, by the target base station, whether the preset SCTP flow identifier is consistent with the SCTP flow identifier of the source base station; if yes, the first response message is invoked, and if not, the second response message is invoked;

a first response message module, configured to generate, by the target base station, a response message of the X2 link according to the preset SCTP flow identifier;

a second response message module, configured to generate, by the target base station, a response message of the X2 link according to the SCTP flow identifier of the source base station;

And returning to the module, configured to return, by the target base station, a response message of the X2 link to the source base station.

Preferably, the second response message module includes:

And modifying, by the target base station, the preset SCTP flow identifier according to the SCTP flow identifier of the source base station;

Writing to the module, the target base station is configured to write the modified preset SCTP flow identifier Enter the response message of the X2 link.

Preferably, the device further includes:

An acquiring module, configured to acquire, by the target base station, an SCTP flow identifier of the source base station in the request message;

Generating a module, configured to generate, by the target base station, a field that carries an SCTP flow identifier of the source base station;

The identifier judging module includes:

And an extracting module, configured to: the target base station extracts an SCTP flow identifier of the source base station from the field;

The determining module is configured to determine, by the target base station, whether the preset SCTP flow identifier is consistent with the SCTP flow identifier of the source base station.

Preferably, the modifying module comprises:

An acquiring module, configured to acquire, by the target base station, an SCTP flow identifier of the source base station in the field;

The modifying module is configured to modify, by the target base station, the preset SCTP flow identifier according to the SCTP flow identifier of the source base station in the field.

Preferably, the device further includes:

And a reservation module, configured to reserve, by the target base station, the preset SCTP flow identifier. The embodiment of the present application further discloses a base station, including:

The receiving message module is configured to receive, by the target base station, a request message for establishing an X2 link sent by the source base station, where the request message includes an SCTP flow identifier of the source base station;

a second response message module, configured to: the target base station according to an SCTP flow identifier of the source base station Generating a response message for the X2 link;

A computer readable recording medium having recorded thereon a program for executing the method of claim 1 is provided in the embodiment of the present application. Compared with the prior art, the present application includes the following advantages:

The target base station of the present application can determine whether to dynamically modify the default configured SCTP flow identifier of the base station according to the SCTP flow identifier carried by the source base station to establish an X2 link message, and determine the SCTP flow identifier of the base station itself to ensure that the X2 is established. The response message of the link can respond on the specified SCTP flow identifier carried in the request message, and then complete the message interaction. Because the SCTP flow identifier in the response message is dynamically modified, the compatibility of different device manufacturers on the X2 interface can be improved, and the maximum compatibility can be achieved when interworking. Therefore, it is possible to connect base stations of different manufacturers, quickly establish an X2 link connection between base stations, and quickly optimize the network. DRAWINGS

Figure 1 is a schematic diagram of a self-established scenario of an X2 link;

2 is a flow chart of the steps of Embodiment 1 of the X2 link self-establishment method of the present application; FIG. 3 is a screenshot of an IE for establishing an X2 link signaling request message sent by a source base station according to the present application;

4 is a screenshot of an IE for establishing an X2 link signaling response message returned by a target base station of the present application;

5 is a flow chart of the steps of Embodiment 2 of the X2 link self-establishment method of the present application; FIG. 6 is a flowchart of self-establishment of an X2 link according to the present application;

7 is a flowchart of an X2 link self-establishment in a target base station according to the present application; FIG. 8 is a structural block diagram of an apparatus for self-establishing an X2 link according to the present application; FIG. 9 is a base station of the present application. A block diagram of the structure of an embodiment. detailed description The above described objects, features and advantages of the present application will become more apparent and understood.

One of the core concepts of the present application is that the target base station can determine whether to dynamically modify the default configured SCTP flow of the base station according to the SCTP flow identifier carried by the source base station to establish an X2 link message and compare with its own SCTP flow identifier. The identification is to ensure that the response message for establishing the X2 link can respond on the specified SCTP flow identifier carried in the request message, and then complete the message interaction. Therefore, it is possible to connect base stations of different manufacturers, quickly establish an X2 link connection between base stations, and quickly optimize the network.

Referring to FIG. 2, it is a flowchart of the steps of Embodiment 1 of the method for self-establishing an X2 link according to the present application, which may specifically include the following steps:

Step 101: The target base station receives a request message for establishing an X2 link sent by the source base station, where the request message includes an SCTP flow identifier of the source base station.

In practice, the source base station sends a request message for establishing an X2 link to the target base station, that is, an X2 SETUP REQUEST message, and after receiving the request message for establishing the X2 link, the target base station obtains the SCTP flow identifier of the source base station. That is, the SCTP public stream ID of the source base station.

In the prior art, the SCTP transport layer SCTP flow identifier is not specified in the SCTP protocol. Therefore, in the X2-IOT scenario of the base station of the different vendor, the X2 link setup fails due to the SCTP flow identifier mismatch.

Step 102: The target base station determines whether the preset SCTP flow identifier is consistent with the SCTP flow identifier of the source base station; if yes, execute step 103, if no, proceed to step 104; and include preset SCTP in the target base station. The flow identifier includes the SCTP flow identifier included in the request message for establishing the X2 link sent by the source base station. The target base station compares the SCTP flow identifier in the X2 SETUP REQUEST message with the SCTP flow identifier configuration preset by itself, to determine whether the target base station and the source base station can establish an X2 link connection.

Referring to FIG. 3, a IE screenshot of a signaling request message for establishing an X2 link sent by a source base station according to the present application is shown. The figure is an X2 setup request sent by a source base station, that is, an X2 link setup request message, which carries an SCTP. Flow identifier 0x0000; a type of the present application shown in FIG. A screenshot of the IE of the signaling response message for establishing the X2 link returned by the target base station. The figure is the target base station X2 setup Response, that is, the 链路2 link response message, which carries the SCTP flow identifier 0x0001, because the SCTP flow identifier between the two base stations is not Matching may result in the failure of establishing an X2 link between the two base stations.

It should be noted that, in order to enable the establishment of the X2 link, the SCTP flow identifier carried in the X2 setup request sent by the source base station should be matched with the SCTP flow identifier carried in the X2 setup Response returned by the target base station. That is, both the source base station and the target base station receive and process messages on the same data stream.

Step 103: The target base station generates a response message of the X2 link according to the preset SCTP flow identifier.

If the target base station determines that the preset SCTP flow identifier is consistent with the SCTP flow identifier of the source base station, the X2 link setup response message, that is, the X2 SETUP RESPONSE message, is directly configured according to the default SCTP flow identifier configuration of the source base station, and the target can be completed. Establishment of an X2 link between the base station and the source base station.

Step 104: The target base station generates a response message of the X2 link according to the SCTP flow identifier of the source base station.

If the source station sends the X2 link request message, that is, the SCTP stream identifier in the X2 SETUP REQUEST message is inconsistent with the target base station's own SCTP stream identifier, the target base station will carry the source base station in the setup X2 link request message. The SCTP flow identifier is backfilled in the X2 link setup response message, that is, the X2 SETUP RESPONSE message, to ensure that both the source base station and the target base station establish the X2 link in the case that the SCTP flow IDs match.

In a preferred embodiment of the present application, the step 104 may specifically include the following substeps:

Sub-step S11, the target base station modifies the preset SCTP flow identifier according to the SCTP flow identifier of the source base station;

Sub-step S12, the target base station writes the modified preset SCTP flow identifier into a response message of the X2 link.

The target base station includes a high-level module HL and a processing module OM, and the high-level module HL is found at X2. After receiving the SCTP flow identifier on the dedicated link, the high-level module HL sends a message to the processing module OM, which carries the received SCTP flow identifier, and the processing module OM reserves the SCTP flow identifier and modifies the default configuration of the target base station itself to notify the target base station. The high-level module HL sends the response message to the source base station according to the modified SCTP flow identifier in the response message for establishing the X2 link.

Step 105: The target base station returns a response message of the X2 link to the source base station. After the response message of the X2 link is generated, the target base station sends the response message to the source base station to complete the self-establishment process of the X2 link between the base stations. Referring to FIG. 5, it is a flow chart of the second embodiment of the method for self-establishing the X2 link of the present application, which may specifically include the following steps:

Step 201: The target base station receives a request message for establishing an X2 link sent by the source base station, where the request message includes an SCTP flow identifier of the source base station.

Step 202: The target base station acquires an SCTP flow identifier of the source base station in the request message. Step 203: The target base station generates a field that carries the SCTP flow identifier of the source base station. In a specific implementation, the high-level module of the target base station HL receives the establishment of the source base station transmission

The request message of the X2 link (the request message includes the SCTP flow identifier of the source base station), generates a field carrying the SCTP flow identifier of the source base station, and sends a message notification processing module OM.

Step 204: The target base station determines whether the preset SCTP flow identifier is consistent with the SCTP flow identifier of the source base station; if yes, step 205 is performed, and if no, step 206; in a preferred embodiment of the present application The step 204 may specifically include the following sub-steps:

Sub-step S21, the target base station extracts the SCTP flow identifier of the source base station from the field; sub-step S22, the target base station determines whether the preset SCTP flow identifier is consistent with the SCTP flow identifier of the source base station.

Specifically, the processing module OM of the target base station extracts the SCTP flow identifier of the source base station from the field, and determines whether the SCTP flow identifier of the source base station is consistent with the default SCTP flow identifier configuration of the target base station.

Step 205: The target base station generates an X2 link according to the preset SCTP flow identifier. Message

Step 206: The target base station generates a response message of the X2 link according to the SCTP flow identifier of the source base station.

In a preferred embodiment of the present application, the step 206 may specifically include the following substeps:

Sub-step S31, the target base station acquires an SCTP flow identifier of the source base station in the field; and sub-step S32, the target base station modifies the preset SCTP flow identifier according to the SCTP flow identifier of the source base station in the field.

The processing module of the target base station OM modifies the configuration of the default SCTP flow identifier according to the SCTP flow identifier carried in the field in the HL message of the high-level module, and the processing module OM follows the modified

The SCTP Flow Identification Configuration Notification High Level Module HL sends a response message to establish the X2 link to the source base station.

Step 207: The target base station returns a response message of the X2 link to the source base station. In order to enable those skilled in the art to further understand the embodiments of the present application, a specific example of the X2 link self-establishment process of the present application is described below.

Referring to FIG. 6, a flow chart of self-establishment of an X2 link of the present application specifically includes the following steps:

Step 1.1: The source base station initiates an X2 setup request message on the SCTP flow identifier. Step 1.2: The target base station determines whether the SCTP flow identifier and the self-configured SCTP flow identifier match; if yes, execute step 1.3; if not, execute step 1.4;

Step 1.3: Perform an X2 setup response according to the SCTP flow identifier configured by default, and maintain the default SCTP flow identifier configuration of the base station;

Step 1.4: The SCTP flow identifier of the X2 establishment response message is backfilled according to the SCTP flow identifier of the X2 request message sent by the source base station, and the default configuration is adapted to the SCTP flow identifier of the requester.

Referring to FIG. 7, a flow chart of self-establishment of an X2 link in a target base station of the present application includes the following steps: Step 2.1: The high-level module HL receives the X2 link establishment request message (carrying the Stream Identifier, that is, the SCTP flow identifier of the source base station), and sends a message notification processing module OM (the added field carries the SCTP flow identifier field);

Step 2.2: Processing module The OM receives the message notification of the high-level module HL;

Step 2.3: The processing module OM determines whether the SCTP flow identifier of the source base station is consistent with the default SCTP flow identifier configuration of the source base station; if yes, step 2.4 is performed; if not, step 2.5 is performed;

Step 2.4: According to the default SCTP flow identifier configuration notification, the HL module sends an X2 link establishment response message;

Step 2.5: The processing module OM modifies the configuration according to the SCTP flow identifier of the source base station carried in the HL message notification field of the high-level module;

Step 2.6. Processing Module The OM notifies the HL module to send an X2 link establishment response message according to the modified SCTP flow identifier configuration value of the source base station.

In summary, for an SCTP flow identifier established by an X2 link, which is not explicitly specified in the 3GPP protocol, an X2-IOT scenario of different devices between different vendors is an adaptive mechanism of the SCTP flow identifier, and is different from the device. Manufacturers can achieve maximum compatibility when interconnecting on the X2 interface.

In a preferred embodiment of the present application, the method may further include the following steps: the target base station retains the preset SCTP flow identifier.

After the connection of the X2 link between the source base station and the target base station is completed, the target base station retains the preset SCTP flow identifier, that is, the SCTP flow identifier configured by itself.

In the embodiment of the present application, the base station reserves the default configuration of the SCTP flow identifier and the process of introducing the SCTP flow identifier of the received request message and the default SCTP flow identifier configuration by the base station, and has two purposes:

The X2 link is established. Any party has the right to initiate the X2 link setup request. The base station acting as the sender needs to have its own default SCTP flow identifier configuration during the self-establishment process. 3gpp agreement requirements;

Second, the base station as the receiving end directly uses the SCTP stream identifier if it matches. The self-configuration can trigger the establishment of the X2 link more efficiently, avoiding the backfilling operation of the unnecessary SCTP flow identifier of the base station, and reducing the delay of establishing the X2 link.

It should be noted that, for the method embodiment, for the sake of simple description, it is expressed as a series of action combinations, but those skilled in the art should understand that the present application is not limited by the described action sequence, because Application, some steps can be performed in other orders or at the same time. In addition, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the present application. FIG. 8 is a structural block diagram of an apparatus for self-establishing an X2 link according to the present application. The device may include the following modules:

The receiving message module 301 is configured to receive, by the target base station, a request message for establishing an X2 link sent by the source base station, where the request message includes an SCTP flow identifier of the source base station;

In a preferred embodiment of the present application, the apparatus may further include: an acquiring module, configured to acquire, by the target base station, an SCTP flow identifier of the source base station in the request message;

The identifier determining module 302 is configured to determine, by the target base station, whether the preset SCTP flow identifier is consistent with the SCTP flow identifier of the source base station; if yes, the first response message 303 is invoked, and if not, the second response message 304 is invoked. ;

In a preferred embodiment of the present application, the identifier judging module 302 may include the following modules:

The first response message module 303 is configured to generate, by the target base station, a response message of the X2 link according to the preset SCTP flow identifier;

The second response message module 304 is configured to: the target base station according to the SCTP flow of the source base station Identify a response message that generates an X2 link;

In a preferred embodiment of the present application, the second response message module 304 can include the following modules:

The writing module is configured to write, by the target base station, the modified preset SCTP flow identifier into a response message of the X2 link.

In a preferred embodiment of the present application, the modifying module may include the following module: an acquiring module, configured to acquire, by the target base station, an SCTP flow identifier of a source base station in the field;

The returning module 305 is configured to return, by the target base station, a response message of the X2 link to the source base station.

In a preferred embodiment of the present application, the apparatus may further include the following module: a reservation module, configured to reserve, by the target base station, the preset SCTP flow identifier. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment. FIG. 9 is a structural block diagram of an embodiment of a base station according to the present application, which may specifically include the following modules:

The receiving message module 401 is configured to receive, by the target base station, a request message for establishing an X2 link sent by the source base station, where the request message includes an SCTP flow identifier of the source base station;

The identifier determining module 402 is configured to determine, by the target base station, whether the preset SCTP flow identifier is consistent with the SCTP flow identifier of the source base station; if yes, the first response message 403 is invoked, and if not, the second response message 404 is invoked. ;

The first response message module 403 is configured to generate, by the target base station, a response message of the X2 link according to the preset SCTP flow identifier. The second response message module 404 is configured to generate, by the target base station, a response message of the X2 link according to the SCTP flow identifier of the source base station;

The returning module 405 is configured to return, by the target base station, a response message of the X2 link to the source base station. The embodiment of the present application also provides a computer readable recording medium on which the program for the above embodiment is recorded.

The computer readable recording medium includes any mechanism for storing or transmitting information in a form readable by a computer (e.g., a computer). For example, a machine-readable medium includes a read only memory (ROM), a random access memory (RAM), a magnetic disk storage medium, an optical storage medium, a flash storage medium, an electrical, optical, acoustic or other form of propagated signal (eg, a carrier wave) , infrared signals, digital signals, etc.). The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments can be referred to each other.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, apparatus, or computer program product. Thus, the application can take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to general purpose computing to produce a machine that is executed by a processor of a computer or other programmable data processing device The instructions of the line produce means for implementing the functions specified in one or more of the flow or in a block or blocks of the flowchart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

While the preferred embodiment of the present invention has been described, it will be apparent that those skilled in the art can make further changes and modifications to the embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments, and all modifications and variations falling within the scope of the application.

Finally, it should also be noted that in this context, relational terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities. There is any such actual relationship or order between operations. Furthermore, the terms "including", "comprising" or "comprising" or "comprising" are intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that includes a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. The elements defined by the phrase "comprising a ...", without further limitation, do not exclude the presence of additional identical elements in the process, method, article, or device that comprises the element.

The method, the device, and a base station for establishing an X2 link provided by the present application are described in detail. The principles and implementation manners of the application are described in the following. The description of the foregoing embodiment is only Set to help understand the method of this application and its core At the same time, for the person skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and the scope of application. In summary, the content of the present specification should not be construed as the present application. limits.

Claims

Claim

A method for self-establishing an X2 link, comprising:

The target base station receives the request message for establishing the X2 link sent by the source base station, where the request message includes the SCTP flow identifier of the source base station;

The method according to claim 1, wherein the step of the target base station generating a response message of the X2 link according to the SCTP flow identifier of the source base station includes:

The method according to claim 1, wherein before the step of determining, by the target base station, whether the preset SCTP flow identifier is consistent with the SCTP flow identifier of the source base station, the method further includes:

The target base station acquires an SCTP flow identifier of the source base station in the request message; the target base station generates a field that carries an SCTP flow identifier of the source base station; and the target base station determines a preset SCTP flow identifier and the source base station The steps of whether the SCTP flow identifiers are consistent include:

The method according to claim 2 or 3, wherein the step of modifying, by the target base station, the preset SCTP flow identifier according to the SCTP flow identifier of the source base station includes: And the target base station acquires an SCTP flow identifier of the source base station in the field, and the target base station modifies the preset SCTP flow identifier according to the SCTP flow identifier of the source base station in the field.

5. The method according to claim 4, further comprising:

The target base station retains the preset SCTP flow identifier.

6. A self-established device for an X2 link, comprising:

The device according to claim 6, wherein the second response message module comprises:

8. The device according to claim 6, further comprising:

Generating a module, configured to generate, by the target base station, a field that carries an SCTP flow identifier of the source base station; The identifier judging module includes:

9. The apparatus according to claim 7 or 8, wherein the modification module comprises:

10. The device according to claim 9, further comprising:

And a reservation module, configured to reserve, by the target base station, the preset SCTP flow identifier.

A base station, comprising:

A computer readable recording medium having recorded thereon a program for executing the method of claim 1.