CN107277934B

CN107277934B - Method and system for establishing connection between base stations, and configuration method and system

Info

Publication number: CN107277934B
Application number: CN201610216932.9A
Authority: CN
Inventors: 许森; 刘悦; 朱雪田; 孙震强; 张光辉
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2016-04-08
Filing date: 2016-04-08
Publication date: 2020-02-21
Anticipated expiration: 2036-04-08
Also published as: CN107277934A

Abstract

The invention discloses a method and a system for establishing X2 interface connection between base stations and a method and a system for expanding and configuring base station identification, wherein the establishing method comprises the following steps: the source base station extracts a basic base station identifier and an extended base station identifier from the ECGI according to preset configuration information, and sends an identification request carrying the basic base station identifier and the extended base station identifier to a core network; the source base station establishes X2 interface connection with the adjacent base station based on the first base station identification set information and the IP address which are fed back by the core network and supported by the adjacent base station to which the adjacent cell belongs. The method and the system can realize the automatic identification and the automatic configuration of the cell identifier with flexible length for the base station and the core network, reduce the manual intervention and the maintenance cost in network deployment, multiplex the flow of the current protocol, enhance the backward compatibility, solve the larger requirement of the BBU pool for the cell address identifier in the future and the problem of limited address in the current standard and improve the addressing capacity of the cell identifier.

Description

Method and system for establishing connection between base stations, and configuration method and system

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and a system for establishing an X2 interface connection between base stations, and a method and a system for configuring base station identifier expansion.

Background

The ECGI (E-UTRAN Cell Global Identifier) has Global uniqueness and consists of three parts, namely PLMN ID, eNodeB ID and Cell ID. As shown in fig. 1, the ECGI may be used to identify a cell (or a sector), and may be used in scenarios of creating base station and cell data, sending the data to a terminal through broadcast information for network selection, assisting a Self-Organized network (SON) function, locating a service, and distinguishing service locations in a charging ticket. PLMN ID (Public Land Mobile Network) is a Mobile Network number, eNodeB ID is abbreviated eNB ID, and for identifying a base station, the macro base station has 20 bits to form 5 16-ary codes, such as X1X2X3X4X5 in fig. 1. The Cell ID is used to identify the Cell under the base station, and a total of 8 bits constitute 2 16-ary codes, such as X6X7 in fig. 1. According to the current specification, there are currently two types of base stations: a macro base station and a home base station. The eNB-ID of the macro base station has 20 bits, and supports about 104 ten thousand base stations, and the Cell-ID has 8 bits and supports a maximum of 256 cells. The eNB-ID of the home base station has 28 bits and supports only one cell.

In consideration of the lack of addresses of base stations and the existence of a demand for more than 256 cell addresses in a BBU pool scenario, as shown in fig. 2, in the stage R14, the main purpose of research proposed by 3GPP in china telecommunications is to research how to flexibly configure the allocation of address bits of base stations and cells without affecting air interfaces, so as to implement the expansion of base station addresses and cell addresses in a specific scenario. In the current protocol, the base station notifies the core network of the address information of the eNB of the base station through the process of S1 establishment, and after receiving the message, the core network acquires the address information of the base station and uses the address information as a basis for routing. When other core network nodes or other base stations send the ECGI information of a certain cell in the base station, the cell address information part and the base station address part are deduced according to the recorded eNB-ID. When an X2 interface is established between two base stations, the target base station is usually notified of its own base station address number, the supported cell information, and the neighborhood of the cell. Through the process, the two cells can know the address configuration conditions of the base stations and the cells of the adjacent base stations. For the problem of cell address expansion, if the current protocol architecture is adopted, the following problems exist:

1. if the enhancement of the cell address number is realized by simply reducing the bit number of the base station, on one hand, the address space of other base stations with normal address length of 20 bits is preempted, and the address adjustment of some base stations can be caused. On the other hand, when the cell address space is not fully utilized, certain waste is also brought.

2. In the current protocol, the MME can only identify two types of addresses, 20-bit address and 28-bit address, and a new base station address numbering scheme may be affected in order to expand the number of cells, and a core network needs to define a new identification scheme.

3, X2 needs to interact configuration information of two cells when establishing, when the number of cells supported by a base station is too large (e.g. exceeds 256), the message field established by X2 is too large, and since the coverage area of the base station is too large, many cells covered by the base station are not adjacent to a specific neighboring cell and are far apart from the specific neighboring cell, so that these configuration information are necessary. This phenomenon also results in failure of the mechanism to prevent PCI confusion and collision because too much PCI information from the cell is passed to the target base station, as shown in fig. 4. The super cell coverage is very large, and all cell configuration information is interacted according to the existing scheme, and for the neighbor cell of the super cell, it is found that a proper PCI cannot be found for configuration.

In view of the above problems, certain improvements in standards and equipment implementation are required to ensure smooth proceeding of subsequent networks and implementation.

Disclosure of Invention

In view of the above, a technical problem to be solved by the present invention is to provide a method and a system for establishing an X2 interface connection between base stations, and a method and a system for configuring a base station identifier with capacity expansion.

According to an aspect of the present invention, there is provided a method for establishing an X2 interface connection between base stations, including: the source base station receives the ECGI of the adjacent cell sent by the terminal side; under the mode of starting the flexible base station identification recognition, the source base station extracts a basic base station identification and an extended base station identification from the ECGI according to preset configuration information; the source base station sends a target base station identification request carrying the basic base station identification and the extended base station identification to a core network; the core network feeds back an address identification result to the source base station, and the source base station acquires a first base station identification set and an IP address supported by an adjacent base station to which an adjacent cell belongs based on the address identification result; and the source base station establishes X2 interface connection with the adjacent base station based on the first base station identification set and the IP address.

Optionally, the source base station extracts the first 20 bits of the Cell Identity IE in the ECGI as the basic base station Identity; and the source base station extracts the first 1-20 + X bits of the Cell Identity IE as the extended base station identification.

Optionally, the X is a maximum base station identifier extension bit number configured by the first network management system; wherein, X is one of 1, 2, 3 and 4.

Optionally, the sending, by the source base station, the target base station identifier identification request carrying the basic base station identifier and the extended base station identifier to the core network includes: the source base station sends a request message for identifying the target base station identification to MME through an S1 interface; wherein, the information carried by the request message at least comprises: the basic base station identification, the extended base station identification and the identification request identification.

Optionally, the source base station determines whether the basic base station identifier, the prediction base station identifier formed by combining the basic base station identifier and the extended base station identifier, and the base station identifier in the already-established X2 interface base station identifier record cannot be successfully matched; if yes, the source base station sends the request message to the MME, and if not, the source base station determines that X2 interface connection is established with the adjacent base station and does not send the request message; wherein the established X2 interface base station identification record is maintained by the source base station.

Optionally, the feeding back, by the core network, the address identification result to the source base station includes: the MME matches the basic base station identification and the extended base station identification with the base station identification information recorded by the MME and judges whether a corresponding target base station identification exists or not; if the target base station identification exists, the MME determines the first base station identification set to which the target base station identification belongs; the MME forwarding the request message to the neighbor base station corresponding to the first set of base station identities over an S1 interface; and the MME receives an S1 interface message sent by the adjacent base station and extracts the IP address from the S1 interface message.

Optionally, after the MME receives the S1 interface message sent by the neighboring base station, the method includes: the MME acquires other base station identifications except the target base station identification in the first base station identification set to generate a first set; and the MME sends the identification result response message carrying the target base station identification, the first set, the IP address and identification success information to the source base station.

Optionally, the feeding back, by the core network, the address identification result to the source base station includes: and if the target base station identification does not exist, the MME sends the identification result response message carrying the failure reason to the source base station.

Optionally, the failure reason includes: the base station identity is not present.

Optionally, the establishing, by the source base station, an X2 interface connection with the neighboring base station based on the first base station identification set and the IP address includes: after receiving the identification result response message and determining that the identification is successful, the source base station extracts the target base station identifier, the first set and the IP address from the identification result response message and stores the target base station identifier, the first set and the IP address in a base station identifier information record; the source base station adds the target base station identifier to a target base station identifier list to be established in an X2 interface base station identifier information record to be established; the source base station acquires all target base station identifications associated with the adjacent base station in the base station identification list to be built so as to generate a target base station identification request list; and the source base station establishes X2 interface connection with the adjacent base station based on the target base station identification request list and the IP address.

Optionally, the source base station sends an X2 interface establishment request to the neighboring base station according to the IP address, where the X2 interface establishment request carries the target base station identifier request list. And the neighboring base station feeds back an X2 interface response message to the source base station, wherein the X2 interface response message carries all base station identifiers supported by the neighboring base station and cell configuration information corresponding to the target base station identifier in the target base station identifier request list.

Optionally, if the neighboring base station determines that the X2 interface establishment request does not carry the target base station identifier request list, the X2 interface response message carries cell configuration information corresponding to all base station identifiers supported by the neighboring base station.

Optionally, after receiving the X2 interface response message and establishing an X2 interface connection, the source base station deletes all target base station identification information associated with the neighboring base station in the to-be-established X2 interface base station identification information record; and the source base station adds all base station identifications supported by the adjacent base station into the established X2 interface base station identification record.

Optionally, the first network management system configures whether to start a flexible base station identifier recognition mode for the source base station, and sets the configuration information; wherein the configuration information comprises: the maximum base station identifies the value of the number of extended bits X.

According to another aspect of the present invention, a method for configuring capacity expansion of a base station identifier is provided, including: the base station configures a second base station identification set containing a plurality of base station identifications, wherein the base station identifications comprise: an extended base station identity and/or a basic base station identity; the base station sends an S1 interface establishment request carrying the second base station identification set to a core network so as to request to establish S1 interface connection corresponding to the second base station identification set; and the core network returns an S1 interface establishment response message to inform an S1 interface establishment result and a verification result of the plurality of base station identifications in the second base station identification set.

Optionally, the bits occupied by the basic base station identifier are the first 20 bits of a Cell Identity IE in the ECGI; and the bit occupied by the extended base station identifier is the first 20+ extended bit number W bit of the Cell Identity IE.

Optionally, the sum of the number of bits occupied by the Cell identifier Cell ID generated by the base station and the number of bits occupied by the base station identifier is 28.

Optionally, the number W of extension bits is less than or equal to 4; and the second network management system configures the second base station identification set.

Optionally, the sending, by the base station to the core network, the S1 interface establishment request carrying the second base station identifier set specifically includes: the base station sends an S1 interface establishment request carrying the second base station identification set to a Mobile Management Entity (MME);

optionally, the MME matches a plurality of base station identities in the second set of base station identities with base station identities already recorded by the MME, and checks whether the plurality of base station identities do not have the same base station identity; if so, the MME records the second base station identification set, and sends an S1 interface response message to the base station to inform S1 that the connection establishment is successful.

Optionally, after the MME notifies the base station that the connection establishment is successful, establishing an S1 interface connection between the MME and the base station, where the S1 interface connection corresponds to the second base station identifier set; when the MME determines that the destination base station identifier carried in the received S1 interface message is the same as any base station identifier in the second base station identifier set, the MME judges whether the base station is in the management range of the base station; if so, the MME forwards the S1 interface message carrying the destination base station identifier to the base station through an S1 interface connection corresponding to the second base station identifier set; if not, the MME forwards the S1 interface message carrying the destination base station identifier to other core network elements.

Optionally, if one or more base station identities in the base station identity set are the same as the base station identities already recorded by the MME, the MME sends an S1 interface response message to the base station, notifies the S1 of connection failure, and carries the one or more base station identities and an error reason in this S1 interface response message.

Optionally, the error cause includes: the base station identity is not valid.

Optionally, after the base station determines that the connection establishment is failed in S1, the one or more base station identifiers and the error reason are sent to a second network management system.

According to another aspect of the present invention, there is provided a system for establishing an X2 interface connection between base stations, comprising: a source base station, a neighbor base station and core network equipment; the source base station includes: an identifier receiving module, configured to receive an ECGI of a neighboring cell sent by a terminal side; the identification extraction module is used for extracting a basic base station identification and an extended base station identification from the ECGI according to preset configuration information under the condition of starting a flexible base station identification recognition mode; an identification request sending module, configured to send a target base station identifier identification request carrying the basic base station identifier and the extended base station identifier to a core network; an identification result receiving module, configured to receive an address identification result fed back by the core network, where the source base station obtains, based on the address identification result, a first base station identifier set and an IP address supported by an adjacent base station to which an adjacent cell belongs; an X2 connection establishing module, configured to establish an X2 interface connection with the neighboring base station based on the first set of base station identities and the IP address.

Optionally, the identifier extracting module is specifically configured to extract the first 20 bits of the Cell Identity IE in the ECGI as the basic base station identifier; extracting the first 1-20 + X bits of the Cell Identity IE as the extended base station identification.

Optionally, the core network device includes: an MME; the identification request sending module is specifically configured to send a request message for identifying a target base station identifier to the MME through an S1 interface; wherein, the information carried by the request message at least comprises: the basic base station identification, the extended base station identification and the identification request identification.

Optionally, the identification request sending module is further configured to determine whether the basic base station identifier, the prediction base station identifier formed by combining the basic base station identifier and the extended base station identifier, and the base station identifier in the already-established X2 interface base station identifier record cannot be successfully matched; if yes, the source base station sends the request message to the MME, and if not, the source base station determines that X2 interface connection is established with the adjacent base station; wherein the established X2 interface base station identification record is maintained by the recognition result receiving module.

Optionally, the MME includes: a target address judging module, configured to match the basic base station identifier and the extended base station identifier with the base station identifier information recorded by the MME, and judge whether a corresponding target base station identifier exists; if the target base station identification exists, determining the first base station identification set to which the target base station identification belongs; a message forwarding module, configured to forward the request message to the neighboring base station corresponding to the first base station identifier set through an S1 interface; a TNL address obtaining module, configured to receive an S1 interface message sent by the neighboring base station, and extract the IP address from the S1 interface message.

Optionally, the MME further comprises: a recognition result feedback module, configured to obtain other base station identifiers in the first base station identifier set except the target base station identifier to generate a first set; and sending the identification result response message carrying the target base station identification, the first set, the IP address and identification success information to the source base station.

Optionally, the identification result feedback module is further configured to send the identification result response message carrying a failure reason to the source base station if the target base station identifier does not exist.

Optionally, the identification result receiving module is further configured to, after receiving the identification result response message and determining that the identification is successful, extract, by the source base station, the target base station identifier, the first set, and the IP address from the identification result response message and store the target base station identifier, the first set, and the IP address in a base station identifier information record; the source base station adds the target base station identifier to a target base station identifier list to be established in an X2 interface base station identifier information record to be established; the X2 connection establishing module is further configured to acquire all target base station identifiers associated with the neighboring base stations in the to-be-established base station identifier list to generate a target base station identifier request list; and establishing an X2 interface connection with the adjacent base station based on the target base station identification request list and the IP address.

Optionally, the X2 connection establishing module is specifically configured to send an X2 interface establishment request to the neighboring base station according to the IP address, where the X2 interface establishment request carries the target base station identifier request list. The neighbor base station includes: a configuration information feedback module, configured to feed back an X2 interface response message to the X2 connection establishment module, where the X2 interface response message carries all base station identifiers supported by the neighboring base station and cell configuration information corresponding to the target base station identifier in the target base station identifier request list.

Optionally, the configuration information feedback module is further configured to, if it is determined that the X2 interface establishment request does not carry the target base station identifier request list, fill cell configuration information corresponding to all base station identifiers supported by the neighboring base station in the X2 interface response message.

Optionally, the X2 connection establishing module is further configured to delete all target base station identification information associated with the neighboring base station in the record of the to-be-established X2 interface base station identification information after receiving the X2 interface response message and establishing an X2 interface connection; and adding all base station identifications supported by the adjacent base station into the established X2 interface base station identification record.

Optionally, the first network management system is configured to configure, for the source base station, whether to start a flexible base station identifier recognition mode, and set the configuration information; wherein the configuration information comprises: the maximum base station identifies the value of the number of extended bits X.

According to another aspect of the present invention, a system for expanding and configuring base station identifiers includes: a base station and core network equipment; the base station configures a second base station identity set comprising a plurality of base station identities, wherein the base station identities comprise: an extended base station identity and/or a basic base station identity; the base station sends an S1 interface establishment request carrying the second base station identification set to a core network so as to request to establish S1 interface connection corresponding to the second base station identification set; and the core network equipment returns an S1 interface establishment response message to inform an S1 interface establishment result and a verification result of the plurality of base station identifications in the second base station identification set.

Optionally, the core network device includes: a mobility management entity MME; the base station, comprising: an interface establishment request unit, configured to send an S1 interface establishment request carrying the second base station identifier set to the MME.

Optionally, the MME includes: an identifier checking unit, configured to match multiple base station identifiers in the second base station identifier set with base station identifiers already recorded by the MME, and check whether the multiple base station identifiers do not have the same base station identifier; an interface establishment response module, configured to, if none of the multiple base station identifiers in the second base station identifier set has a completely same base station identifier, record, by the MME, the second base station identifier set, send an S1 interface response message to the base station, and notify that the connection establishment is successful in S1.

Optionally, the interface establishment response module is further configured to, if one or more base station identifiers in the set of base station identifiers are the same as the base station identifiers already recorded by the MME, send, by the MME, an S1 interface response message to the base station, notify that the connection is failed S1, and carry the one or more base station identifiers and the error cause in this S1 interface response message.

Optionally, the error cause includes: the base station identity is not valid.

Optionally, the base station is further configured to send the one or more base station identifiers and the error reason to the second network management system after determining that the connection establishment at S1 fails.

According to the method and the system for establishing the X2 interface connection between the base stations and the method and the system for expanding the capacity of the base station identifier, one or more bits of the cell identifier are used for expanding the base station identifier, automatic identification and automatic configuration of the base station and the core network on the cell identifier with flexible length can be realized, the manual intervention in network deployment and the maintenance cost of an operator are reduced, the addressing capacity of the cell identifier can be improved, the cell address space can be improved on the basis of not influencing the distribution of the current base station identifier, the information quantity of the cell configuration can be obviously reduced, no influence is caused on a terminal, and good backward compatibility and deployment feasibility are achieved.

Drawings

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

FIG. 1 is a schematic diagram of the composition of an ECGI;

FIG. 2 is a schematic diagram of a "super base station" supporting more than 256 cells;

FIG. 3 is a schematic signaling interaction diagram illustrating the establishment of an X2 connection between base stations and the establishment of an S1 connection between a base station and an MME;

FIG. 4 is a diagram illustrating the problem of PCI confusion misjudgment in the super base station case;

FIG. 5 is a diagram illustrating an embodiment of a method for establishing an X2 interface connection between base stations according to the present invention;

FIG. 6 is a diagram of extended base station identification;

FIGS. 7 and 8 are schematic diagrams of cell address extension schemes; fig. 7 is a schematic diagram of a base station, and fig. 8 is a schematic diagram of a base station identifier;

FIG. 9 is a diagram illustrating another embodiment of a method for establishing an X2 interface connection between base stations according to the present invention;

fig. 10 is a schematic diagram illustrating an embodiment of a base station identifier capacity expansion configuration method according to the present invention;

fig. 11 is a schematic diagram illustrating another embodiment of a base station identifier capacity expansion configuration method according to the present invention;

FIG. 12 is a block diagram illustrating a system for establishing an X2 interface connection between base stations according to the present invention;

fig. 13 is a block diagram of a system for capacity expansion configuration of base station identifiers according to the present invention.

Detailed Description

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

Hereinafter, "first", "second", etc. are only descriptive differences and have no other special meanings.

Fig. 5 is a schematic diagram of an embodiment of a method for establishing an X2 interface connection between base stations according to the present invention, where a terminal may be a mobile phone, a PDA, or the like, as shown in fig. 5:

step 101, the source base station receives the ECGI of the neighboring cell sent by the terminal side.

102, under the condition of starting a flexible base station identification recognition mode, a source base station extracts a basic base station identification and an extended base station identification from an ECGI according to preset configuration information; the extended base station identification here is an extended base station identification that may exist.

The number of bits occupied by the basic base station identifier is N, the extended base station identifier is the basic base station identifier plus X continuous bits behind the basic base station identifier, and X is the preset maximum extended bit number. The source base station extracts the same eNB ID as the basic base station identity from the ECGI when the flexible base station identity recognition mode is turned off.

The eNB ID in the current communication standard is the basic base station identifier of the present invention, and after the capacity expansion of the base station identifier address is performed, one or more bits of the 8 bits occupied by the Cell ID may also be used to identify the base station, and this basic base station identifier + one or more bits are the extended base station identifier of the present invention.

Step 103, the source base station sends a target base station identification request carrying the basic base station identification and the extended base station identification to the core network.

And 104, the core network feeds back an address identification result to the source base station, and the source base station acquires the first base station identification set information and the IP address supported by the adjacent base station to which the adjacent cell belongs based on the address identification result.

And 105, the source base station establishes X2 interface connection with the adjacent base station based on the first base station identification set information and the IP address.

For example, the source base station extracts the first 20 bits of the Cell Identity IE in the ECGI as the basic base station Identity; the source base station extracts the 1-20 + X bits of the Cell Identity IE, namely the first 1-20 + X bits as the extended base station identification. X is the maximum base station identification expansion bit number configured by the first network management system; wherein, X is one of 1, 2, 3 and 4.

As shown in fig. 4, the eNB ID has 20 bits and the Cell ID occupies 8 bits based on the current communication standard. When the base station identification address is not expanded, the eNB ID in the ECGI occupies 20 bits, and the Cell ID occupies 8 bits, that is, the 20-bit eNB ID is the basic base station identification. After the base station identification address is expanded, the original eNB ID with 20 bits is the basic base station identification, 2 bits are separated from 8 bits occupied by the Cell ID, the bit occupied by the expanded base station identification is 20+ 2-22, and the number of bits occupied by the expanded Cell ID is 6, which reduces 2 bits in response.

The first network management system configures whether to start a flexible base station identification recognition mode and configuration information for the source base station. For example, when the flexible base station identifier recognition mode is turned on by the source base station, the source base station extracts N bits from the PLMN ID in the ECGI as the basic base station identifier according to the ECGI format specified by the current protocol in the ECGI based on the ECGI of the neighboring cell sent by the mobile phone, where N is 20 bits according to the current communication standard, and N may be 21, 22, 23, etc. according to the new or improved communication standard. After the basic base station identifier, X continuous bits are extracted, the starting position of the X continuous bits may be immediately after the basic base station identifier, or may be separated from the basic base station identifier by one or more bits, and the starting position of the X continuous bits may be configured through a network management system.

When the source base station closes the flexible base station identification mode, the source base station extracts N bits from the PLMN ID in the ECGI as the basic base station identification according to the ECGI format regulation of the current protocol and the ECGI sent by the mobile phone, and takes the basic base station identification as the eNB ID of the adjacent base station, wherein N is 20 bits according to the current communication standard.

The source base station sends a request message for identifying the target base station identifier to the MME through an S1 interface; the information carried by the request message at least comprises: a basic base station identity, an extended base station identity, an identification request identity, etc.

In one embodiment, the source base station determines whether the basic base station identifier and the extended base station identifier cannot be successfully matched with the base station identifier in the established X2 interface base station identifier record; if yes, the source base station sends a request message to the MME, and if not, the source base station determines that the X2 interface connection is established with the adjacent base station and does not send the request message to the MME. The established X2 interface base station identification record is maintained by the source base station, and the established X2 interface base station identification record may be stored in a database or in a file.

The first network management system configures a plurality of sets of basic base station identifiers and/or extended base station identifiers which are unique in the whole network for a base station, wherein each base station identifier may be a basic base station identifier, such as a 20-bit identifier of a macro base station or a 28-bit identifier of a home base station, or an extended base station identifier, as shown in fig. 7 and 8, 3 base stations are bundled and combined to form a "super base station" supporting more than 256 cells, and 3 base station identifiers corresponding to eNB1, eNB2 and eNB3 are configured, so that support of 768 cells is achieved. The first network management system configures an adjacent base station identification length recognition function and an X2 interface automatic establishment function for the source base station and the adjacent base station respectively.

After the source base station receives the CONFIGURATION information of the network manager, deducing base station identification information of a base station to which an adjacent cell belongs based on ECGI information of a target cell reported by a terminal, wherein the information comprises two parts of a basic base station identification and a possibly existing base station expansion identification, if the two identifications are not in an established X2 interface base station identification record of the source base station, indicating the two base station identification information to MME through eNB CONFIGURATION TRANSFER message, if one or all of the two identifications are already recorded in the record information, judging that an X2 interface with the adjacent base station is already established by the source base station, and not sending the eNB CONFIGURATION TRANSFER message.

And the MME matches the basic base station identification and the extended base station identification with the base station identification information recorded by the MME and judges whether corresponding target base station identification exists or not. The base station identifier in the base station identifier list is recorded as the eNB ID of each base station stored by the MME, some of the eNB IDs in the base station identifier list are the basic base station identifier + the extended base station identifier, and the others are the basic base station identifiers.

When the neighboring base station does not support the expansion of the base station identification address, the eNB ID of the neighboring base station only includes the basic base station identification. For example, the eNB ID of the neighboring base station a occupies 20+2 bits in total, while the eNB ID of the neighboring base station B includes only the basic base station identification, occupying 20 bits. The source base station extracts 20 bits of basic base station identification and X bits as extended base station identification from the ECGI of the adjacent cell of the adjacent base station B according to the 20+ X bits.

The MME may match the received basic base station identity and extended base station identity with the base station identity records in the base station identity list in multiple ways, and determine whether there is a corresponding target eNB ID. For example, the MME traverses the base station identifier record in the base station identifier list, obtains the basic base station identifier and the extended base station identifier of the base station identifier record, and matches the basic base station identifier and the extended base station identifier with the received information, respectively, and if matching is successful, obtains the true target eNB ID of the neighboring base station.

And if the target base station identification exists, the MME determines a first base station identification set to which the target base station identification belongs. The MME forwards the request message to the neighbor base station corresponding to the first set of base station identities over the S1 interface. And the MME receives the S1 interface message sent by the adjacent base station and extracts the IP address from the S1 interface message. The MME acquires other base station identifications except the target base station identification in the first base station identification set to generate a first set; and the MME sends an identification result response message carrying the target base station identification, the first set, the IP address and the identification success information to the source base station.

For example, after receiving the eNB CONFIGURATION transmission, if the basic base station identifier or the extended identifier carried in the message is found to belong to a certain base station identifier set, the MME records the matched base station identifier N1 and other element sets NC in the base station identifier set, and forwards the information to the corresponding target base station in the base station identifier set through the MME CONFIGURATION transmission. And after receiving the MME CONFIGURATION TRANSFER message sent by the MME, the target base station feeds back the IP address of the base station to the MME through the eNB CONFIGURATION TRANSFER message.

And if the target base station identification does not exist, the MME sends an identification result response message carrying the failure reason to the source base station. The failure reason is that the base station identity does not exist, etc. After receiving the identification result response message and determining that the identification is successful, the source base station extracts the target base station identification, the first set and the IP address from the identification result response message and stores the target base station identification, the first set and the IP address in the base station identification information record. And the source base station adds the target base station identification to a target base station identification list to be established in the base station identification information record of the X2 interface to be established. The source base station acquires all target base station identifications associated with the adjacent base stations in the base station identification list to be built so as to generate a target base station identification request list. And the source base station establishes X2 interface connection with the adjacent base station based on the target base station identification request list and the IP address.

For example, after receiving the eNB CONFIGURATION transmission sent by the target base station, that is, the neighboring base station, the MME carries the matched base station identifier N1, the set NC of other elements in the base station identifier set, and the IP address of the target base station in the MME CONFIGURATION transmission message fed back to the source base station.

The source base station records the matched base station identification N1 carried in the MME CONFIGURATION TRANSFER, other element sets NC and IP address information in the base station identification set, and adds the matched base station identification N1 to the base station identification information record of the X2 interface to be created, wherein the base station identification information record of the X2 interface to be created can be stored in a database or a file. The content in the base station identification information record of the X2 interface to be established at least comprises the following contents: the base station numbers, each base station comprises a unique base station number; and each element in the target base station identification list to be established is a base station identification.

And the source base station sends an X2 interface establishment request to the adjacent base station according to the IP address, wherein the X2 interface establishment request carries a target base station identification request list. And the adjacent base station feeds back an X2 interface response message to the source base station, wherein the X2 interface response message carries all base station identifiers supported by the adjacent base station and cell configuration information corresponding to the target base station identifier in the target base station identifier request list, so that the data transmission quantity can be reduced.

And if the adjacent base station determines that the X2 interface establishment request does not carry the target base station identification request list, carrying cell configuration information corresponding to all base station identifications supported by the adjacent base station in the X2 interface response message. After the source base station receives the X2 interface response message and establishes the X2 interface connection, all target base station identification information associated with the adjacent base station in the identification information record of the X2 interface base station to be established is deleted; the source base station adds all base station identifications supported by the neighbor base stations in the established X2 interface base station identification record.

For example, the source base station extracts a target base station identification request list L1 that needs to establish an X2 interface with the target base station according to the target base station identification list in the to-be-established X2 interface base station identification information record, and initiates an X2 interface establishment request process with the target base station according to the IP address information provided by the target base station, where the message may include the target base station identification request list L1.

After receiving the X2 establishment request message, the target base station carries all base station identifier list information supported by the target base station in the X2 establishment response message, and if the request message carries the target base station identifier request list L1, the target base station provides the cell configuration information corresponding to the corresponding base station identifier to the neighboring cell for the base station identifier in the target base station identifier request list L1, and does not provide the cell configuration information for the base station identifier not in the target base station identifier request list L1.

And if the request message does not carry the target base station identification request list L1, providing configuration information of all supporting cells of the target cell by default. And after receiving the X2 establishment response message, the source base station completes the establishment of the X2 interface with the target base station and deletes all elements corresponding to the target base station in the identification information record of the X2 interface base station to be established. And recording the base station identification set corresponding to the target base station in the established X2 interface base station identification record.

Fig. 9 is a schematic diagram of another embodiment of the method for establishing an inter-base station X2 interface connection according to the present invention, where a source base station is eNB1, a neighbor base station is eNB2, an OMC configures the source base station eNB1 to start a cell identifier length recognition function and an X2 interface self-configuration process, and a base station identifier set of a target base station eNB2 includes 2 base station identifiers, which are 20 bit lengths and are X1 and Y1, respectively.

In step 201, the eNB1 receives a measurement report reported by the terminal, where the measurement report includes ECGI information corresponding to the target cell.

In step 202, the eNB1 checks that the ECGI information is not in its current neighboring cell relationship, and then calculates the basic base station identifier X1 and the possible extended base station identifier X2 corresponding to the target cell according to the ECGI information and the first 20 bits and the first 21 bits, respectively, where both identifiers are not in the "established X2 interface base station identifier record".

In step 203, eNB1 triggers the target cell IP address acquisition procedure and sends an eNB configuration list header message to the MME, where the message includes two base station identities, namely a basic base station identity and a possible extended base station identity.

Step 204, after the MME receives the eNB CONFIGURATION transmission, if the basic base station identifier carried in the message is found to belong to the base station identifier set corresponding to the eNB2, record the matched base station identifier N1 as X1 and other element sets Y1 in the base station identifier set.

Step 205, the MME forwards the information to the corresponding target base station in the base station identity set through the MME CONFIGURATION TRANSFER message.

In step 206, after receiving the MME CONFIGURATION TRANSFER message sent by the MME, the eNB2 feeds back the IP address of the base station to the MME through the eNB CONFIGURATION TRANSFER message.

In step 207, after receiving the eNB CONFIGURATION transmission sent by the eNB2, the MME carries the matching base station identifier X1, the other element set Y1 in the target base station identifier set, and the IP address of the target base station in the MME CONFIGURATION transmission message fed back to the source base station.

In step 208, the eNB1 stores and records the X1, Y1, and IP address information in the "base station identification information record". And adding the X1 into the record of the identification information of the base station with the X2 interface to be built. The eNB1 extracts a target base station identification request list L1 that needs to establish an X2 interface with the eNB2 according to the target base station identification list to be established in the "to-be-established X2 interface base station identification information record" that has only one element of X1, and initiates an X2 interface establishment request process with the eNB2 according to the IP address information provided by the eNB2, where the message may include a "target base station identification request list L1" used for the target base station to provide serving cell information.

In step 209, after receiving the X2 establishment request message, the eNB2 carries the identifiers of the two base stations X1 and Y1 in the X2 establishment response message, and provides only the cell configuration information corresponding to X1 to the eNB 1.

After receiving the X2 establishment response message, the eNB1 completes the establishment of the X2 interface with the eNB2 and deletes all elements corresponding to the eNB2 in the "to-be-established X2 interface base station identification information record". And records the base station identification set corresponding to the eNB2 into the established X2 interface base station identification record.

The method for establishing the X2 interface connection between the base stations in the above embodiment can realize automatic identification of the base stations and the core network for the cell identifiers with flexible lengths, reduce manual intervention in network deployment and maintenance cost of operators, improve addressing capacity of the cell identifiers, improve cell address space on the basis of not influencing current base station identifier allocation, and can significantly reduce cell configuration information amount, has no influence on terminals, and has good backward compatibility and deployment feasibility.

Fig. 10 is a schematic diagram of an embodiment of a base station identifier capacity expansion configuration method according to the present invention, as shown in fig. 10:

step 301, the base station configures a second base station identifier set including a plurality of base station identifiers, where the plurality of base station identifiers include: a basic base station identity and/or an extended base station identity.

Step 302, the base station sends an S1 interface establishment request carrying the second base station identifier set to the core network.

In step 303, the core network returns an interface setup response message of S1, and notifies the interface setup result of S1 and the verification result for the plurality of base station identities in the second base station identity set.

The second set of base station identities may be configured for the base station itself or by a network management system. For example, the second network management system configures a plurality of sets of basic base station identifiers and/or extended base station identifiers that are unique throughout the network for the base station, where each base station identifier may be a basic base station identifier, such as a 20-bit identifier of a macro base station or a 28-bit identifier of a home base station, or an extended base station identifier, as shown in fig. 7 and 8.

After the MME receives the S1 establishment message, if it finds that the base station identifier is a set of multiple base station identifiers, it needs to perform a global network uniqueness check on the base station identifiers in each set, and if one or more base station identifiers are not unique, it determines that the establishment has failed in S1, otherwise, it determines that the establishment has succeeded in S1.

The bit number occupied by the basic base station identification is 20 bits, and the bit number occupied by the extended base station identification is 20+ extended bit number W. The sum of the number of bits occupied by the Cell identifier Cell ID generated by the base station and the number of bits occupied by the base station identifier is 28.

The base station mark capacity expanding configuration method of the invention realizes the capacity expansion of the base station mark by the cell mark occupying one or more bits, the cell mark correspondingly reduces the same bit number, the basic base station mark and the extended base station mark are indicated to the core network by the request message established by S1, the core network matches with the existing base station mark after receiving to check whether the repetition exists, the basic base station mark and the extended base station mark are recorded under the condition of no conflict, and the result of the matching check is notified to the source base station.

For example, based on the current communication standard, the eNB ID has 20 bits, and the Cell ID occupies 8 bits. After the base station identification address is expanded, the original eNB ID with 20 bits is the basic base station identification, and the basic base station identification + takes 1 or more bits from 8 bits occupied by the Cell ID as the extended base station identification.

The second network management system may configure whether to open the base station extension mode for the macro base station, and set configuration information. The configuration information includes: the extended base station identity, the second set of base station identities, the value of W. For example, according to the current communication standard, W is equal to or less than 4, and the like. W is configured to be 2, the sum of the base station identification and the cell identification maintains 28 bits, and the cell identification is correspondingly reduced by 2 bits. When the second network management system configures the base station to close the base station extension mode, the base station identifier still uses the basic base station identifier of 20 bits.

And the base station sends an S1 interface establishment request carrying the second base station identification set to a mobile management entity MME. And the MME matches a plurality of base station identifications in the second base station identification set with the base station identifications already recorded by the MME, checks whether the plurality of base station identifications have no same base station identification, if so, the MME records the second base station identification set, sends an S1 interface response message to the base station and informs the S1 that the connection establishment is successful.

After the MME informs the base station that the S1 connection is successfully established, an S1 interface connection is established between the MME and the base station, when the MME determines that the destination base station identifier carried in the received S1 interface message is the same as any base station identifier in the second base station identifier set, the MME determines that the message needs to be forwarded to a base station entity corresponding to the base station identifier set, and judges whether the base station is in the management range of the MME; if so, the MME forwards the S1 interface message carrying the destination base station identifier to the base station through S1 interface connection corresponding to the second base station identifier set; and if not, the MME forwards the S1 interface message carrying the destination base station identification to other core network elements based on the routing information.

If one or more base station identifications in the base station identification set are the same as the base station identifications already recorded by the MME, the MME sends an S1 interface response message to the base station to inform S1 of connection failure, and the S1 interface response message carries one or more base station identifications and error reasons. And after receiving the failure information indication sent by the MME, the base station sends a base station identification list which cannot pass the uniqueness check and a failure reason to the OMC through an interface between the base station and the OMC.

Fig. 11 is a schematic diagram of another embodiment of a base station identifier capacity expansion configuration method according to the present invention, which is a process of establishing an S1 interface of a base station configured with 3 base station identifiers.

In one embodiment, the OMC configures the base station with three base station identities, one of which eNB-id1 is a 20-bit base station identity and the other two eNB-

ids

2 and 3 are 21-bit base station identities.

Step 401, the base station initiates an S1 interface establishment procedure to the MME, wherein the S1 Setup Request message includes three base station identifiers, which are eNB-id1, eNB-id2, and eNB-id 3.

In step 402, after receiving the S1 Setup Request, the MME performs uniqueness check on the three identifiers in the message one by one, and finds that all the three identifiers are unique through the check.

Step 403, indicating the successful establishment of the bs S1 through the S1 Setup Response message, and recording the bs id set as the bs id set corresponding to the bs.

In step 404, after receiving the S1 Setup Response message sent by the MME, the base station completes the S1 establishment procedure with the MME, and for the base station identifier set, the base station and the MME maintain only one S1 logical connection for the set.

In one embodiment, one of the 3 base station identities eNB-id1 is a 20 bit base station identity and the other two eNB-ids 2 and eNB-id3 are 21 bit base station identities. Wherein the eNB-id2 is found by the MME to be non-unique and informs the base station S1 of the establishment failure.

The OMC configures three base station identifications for the base station, wherein one base station identification eNB-id1 is a base station identification with 20 bits, and the other two eNB-ids 2 and eNB-id3 are base station identifications with 21 bits.

In step 401, the base station initiates an S1 interface establishment procedure to the MME, wherein the S1 Setup Request message includes three base station identities, which are eNB-id1, eNB-id2, and eNB-id 3.

In step 402, after receiving the S1 Setup Request, the MME performs uniqueness check on the three identifiers in the message one by one, and finds that the eNB-id2 is not unique through the check.

Step 403, indicating that the base station S1 failed to establish through an S1 Setup Failure message, where the message includes a base station identifier eNB-id2 that cannot pass the uniqueness check and a Failure reason corresponding to the identifier: the identification is not unique.

In step 404, after receiving the S1 Setup Failure message sent by the MME, the base station determines that the Setup of S1 failed, and notifies the OMC of the failed cell identifier and reason.

In the base station identifier capacity expansion configuration method and system in the above embodiments, one or more bits of the cell identifier are used to expand the base station identifier, and the automatic configuration of the base station and the core network for the cell identifier with flexible length can be realized, the addressing capacity of the cell identifier is improved, the cell address space can be improved on the basis of not influencing the current base station identifier allocation, the cell configuration information amount can be significantly reduced, no influence is caused on the terminal, and good backward compatibility and deployment feasibility are achieved.

According to an embodiment of the present invention, as shown in fig. 12, the present invention provides a system for establishing an X2 interface connection between base stations, including: a source base station 50, a neighbor base station 57 and core network equipment. The source base station includes: an identifier receiving module 51, an identifier extracting module 52, an identification request transmitting module 53, an identification result receiving module 54, and an X2 connection establishing module 55.

The identifier receiving module 51 receives the ECGI of the neighboring cell sent by the terminal side. The identifier extracting module 52 extracts the basic base station identifier and the extended base station identifier from the ECGI according to the preset configuration information in the flexible base station identifier recognition mode. The identification request sending module 53 sends a target base station identifier identification request carrying the basic base station identifier and the extended base station identifier to the core network.

The identification result receiving module 54 receives the address identification result fed back by the core network, and the source base station obtains the first base station identifier set and the IP address supported by the neighboring base station to which the neighboring cell belongs based on the address identification result. The X2 connection establishment module 55 establishes an X2 interface connection with the neighboring base station based on the first set of base station identifications and the IP address.

The identifier extracting module 52 extracts the first 20 bits of the Cell Identity IE in the ECGI as the basic base station identifier, and extracts the 1 st to 20 th + X bits of the Cell Identity IE as the extended base station identifier. X is the maximum base station identification expansion bit number configured by the first network management system; wherein, X is one of 1, 2, 3 and 4.

The core network device includes: an MME 60. The identification request sending module 53 sends a request message for identifying the target base station identifier to the MME through an S1 interface, where the information carried in the request message at least includes: a basic base station identity, an extended base station identity, an identification request identity, etc.

The identification request sending module 53 determines whether the basic base station identifier and the extended base station identifier cannot be successfully matched with the base station identifier in the already established X2 interface base station identifier record, if so, the source base station sends a request message to the MME, and if not, the identification request sending module 53 determines that an X2 interface connection is established with the neighboring base station, and does not send the request message to the MME. The established X2 interface base station identification record is maintained by the recognition result receiving module 54.

The MME comprises: a target address judging module 61, a recognition result feedback module 62, a TNL address obtaining unit 63 and a message forwarding unit 64. The target address determination module 61 matches the basic base station identifier and the extended base station identifier with the base station identifier information recorded by the MME, and determines whether there is a corresponding target base station identifier.

If the target base station identifier exists, the target address determination module 61 determines a first base station identifier set to which the target base station identifier belongs. The message forwarding module 64 forwards the request message to the neighbor base station corresponding to the first set of base station identifications through the S1 interface. The TNL address obtaining module 63 receives the S1 interface message sent by the neighboring base station, and extracts the IP address from the S1 interface message. The identification result feedback module 63 obtains other base station identifiers in the first base station identifier set except the target base station identifier to generate a first set, and sends an identification result response message carrying the target base station identifier, the first set, the IP address and the identification success information to the source base station. If the target base station identifier does not exist, the identification result feedback module 63 sends an identification result response message carrying the failure reason to the source base station. The reasons for failure include: the base station identity is not present, etc.

After the X2 connection establishment module 55 receives the recognition result response message and determines that the recognition is successful, the X2 connection establishment module 55 extracts the target base station identity, the first set, and the IP address from the recognition result response message and stores them in the base station identity information record. The X2 connection establishing module 55 adds the target base station identifier to the target base station identifier list to be established in the X2 interface base station identifier information record to be established. The X2 connection establishing module 55 obtains all target bs identifications associated with neighboring bss in the to-be-established bs identification list to generate a target bs identification request list.

The X2 connection establishing module 55 establishes an X2 interface connection with the neighboring base station based on the target base station identification request list and the IP address. The X2 connection establishing module 55 sends an X2 interface establishing request to the neighboring base station according to the IP address, wherein the X2 interface establishing request carries a target base station identifier request list. The neighbor base station 57 includes: a configuration information feedback module 58. The configuration information feedback module 58 feeds back an X2 interface response message to the X2 connection establishment module, where the X2 interface response message carries all base station identifiers supported by the neighboring base stations and cell configuration information corresponding to the target base station identifier in the target base station identifier request list. If it is determined that the X2 interface establishment request does not carry the target bs identification request list, the configuration information feedback module 58 fills the X2 interface response message with the cell configuration information corresponding to all the bs identifications supported by the neighboring bs.

The X2 connection establishing module 55 deletes all target base station identification information associated with the neighboring base stations in the record of the base station identification information of the X2 interface to be established after receiving the X2 interface response message and establishing the X2 interface connection. The X2 connection establishment module 55 adds all base station identities supported by the neighbor base stations in the established X2 interface base station identity record. The first network management system 59 is configured to configure whether to start the flexible base station identifier recognition mode and set configuration information for the source base station; wherein the configuration information includes: the maximum base station identifies the value of the number of extended bits X.

According to an embodiment of the present invention, as shown in fig. 13, a system for expanding and configuring a base station identifier according to the present invention includes: a base station 70 and core network equipment. The base station 70 configures a second base station identity set comprising a plurality of base station identities, wherein the plurality of base station identities comprises: a basic base station identity and/or an extended base station identity. The base station 70 sends an S1 interface establishment request carrying the second base station identity set to the core network. The core network device returns an S1 interface establishment response message, and notifies the S1 interface establishment result and the verification result for the plurality of base station identities in the second set of base station identities.

The number of bits occupied by the basic base station identity is 20 bits. The bit number occupied by the extended base station identifier is 20+ the extended bit number W. The sum of the number of bits occupied by the Cell identifier Cell ID generated by the base station and the number of bits occupied by the base station identifier is 28. The number of extension bits W is 4 or less. The second network management system 75 may configure a second set of base station identities.

The core network device includes: mobility management entity MME 80. The base station 70 includes: the interface establishment request unit 71. The interface establishment request unit 71 sends an S1 interface establishment request carrying the second base station identifier set to the MME 80. The MME80 includes: an address identification checking unit 81 and an interface establishment response module 82.

The address identifier checking unit 81 matches a plurality of base station identifiers in the second base station identifier set with base station identifiers already recorded by the MME, and checks whether the plurality of base station identifiers do not have the same base station identifier. If the plurality of base station identifiers in the second base station identifier set do not have the same base station identifier, the MME records the second base station identifier set, and sends an S1 interface response message to the base station to notify the S1 that the connection establishment is successful.

After the MME80 informs the base station 70 that the S1 connection was successfully established, an S1 interface connection is established between the MME and the base station. When the MME80 determines that the destination base station identifier carried in the received S1 interface message is the same as the base station identifier in the second base station identifier set, the MME80 determines whether the base station 70 is within its management range, and if so, the MME80 forwards the S1 interface message carrying the destination base station identifier to the base station 70 through the S1 interface connection corresponding to the second base station identifier set; if not, the MME80 forwards the S1 interface message carrying the destination base station identity to other core network elements.

If one or more base station identifiers in the base station identifier set are the same as the base station identifiers already recorded by the MME80, the interface establishment response module 82 sends an S1 interface response message to the base station, notifies the S1 that the connection fails, and carries the one or more base station identifiers and the error cause in this S1 interface response message. The error reasons include: the base station identity is not valid. When it is determined that the connection setup fails at S1, the base station 80 sends one or more base station identities and error reasons to the operation and maintenance center OMC.

The method and the system for establishing the connection of the X2 interface between the base stations and the method and the system for expanding and configuring the base station identifier provided in the above embodiments can realize the automatic identification and the automatic configuration of the base station and the core network for the cell identifier with flexible length, reduce the manual intervention in network deployment and the maintenance cost of an operator, multiplex the flow of the current protocol, enhance the backward compatibility, solve the problems of the future BBU pool that the cell address identifier is greatly required and the address is limited in the current standard, design the scheme for increasing the addressing capacity of the cell identifier, and increase the cell address space on the basis of not influencing the allocation of the current base station identifier; by enhancing the relevant process of S1, the core network can distinguish the capacity of different base station identification lengths, the workload of configuration change of operators is reduced, the information quantity of cell configuration can be obviously reduced, the influences of PCI configuration errors and the like caused by error information are avoided, the influence on the terminal is avoided, the backward compatibility and the deployment feasibility are good, the enhancement can be performed on the existing protocol, no new protocol process is introduced, and the realization difficulty is low.

The method and system of the present invention may be implemented in a number of ways. For example, the methods and systems of the present invention may be implemented in software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically indicated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.

The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A method for establishing an X2 interface connection between base stations, comprising:

a source base station receives an evolved universal terrestrial radio access network (ECGI) cell global identity of a neighboring cell sent by a terminal side;

under the mode of starting the flexible base station identification recognition, the source base station extracts a basic base station identification and an extended base station identification from the ECGI according to preset configuration information;

the basic base station identifier occupies N bits, and the bits occupied by the extended base station identifier are the N bits and X continuous bits after the N bits; wherein, N is a natural number, and X is the maximum base station identification extension bit number;

the source base station sends a target base station identification request carrying the basic base station identification and the extended base station identification to a core network;

the core network feeds back an address identification result to the source base station, and the source base station acquires first base station identification set information and an IP address supported by an adjacent base station to which an adjacent cell belongs based on the address identification result;

and the source base station establishes X2 interface connection with the adjacent base station based on the first base station identification set information and the IP address.

2. The method of claim 1, wherein:

the source base station extracts the first 20 bits of a Cell Identity IE in the ECGI as the basic base station Identity;

the source base station extracts the X bits positioned after the basic base station Identity in the basic base station Identity and the Cell Identity IE as the extended base station Identity.

3. The method of claim 2, wherein:

the X is the maximum base station identification expansion bit number configured by the first network management system;

wherein, X is one of 1, 2, 3 and 4.

4. The method of claim 1, comprising:

the source base station judges whether the basic base station identification and the extended base station identification can not be successfully matched with the base station identification in the established X2 interface base station identification record;

if yes, the source base station sends the request message to MME, and if not, the source base station determines that X2 interface connection is established with the adjacent base station and does not send the request message;

wherein the established X2 interface base station identification record is maintained by the source base station.

5. The method of claim 4, wherein the sending, by the source base station to a core network, a target base station identity identification request carrying the basic base station identity and the extended base station identity comprises:

the source base station sends a request message for identifying the target base station identification to MME through an S1 interface; wherein, the information carried by the request message at least comprises: the basic base station identification, the extended base station identification and the identification request identification.

6. The method of claim 5, wherein the core network feeding back the address identification result to the source base station comprises:

the MME matches the basic base station identification and the extended base station identification with the base station identification information recorded by the MME and judges whether a corresponding target base station identification exists or not;

if the target base station identification exists, the MME determines the first base station identification set to which the target base station identification belongs;

the MME forwarding the request message to the neighbor base station corresponding to the first set of base station identities over an S1 interface;

and the MME receives an S1 interface message sent by the adjacent base station and extracts the IP address from the S1 interface message.

7. The method of claim 6, wherein after the MME receives the S1 interface message sent by the neighboring base station, comprising:

the MME acquires other base station identifications except the target base station identification in the first base station identification set to generate a first set;

and the MME sends the identification result response message carrying the target base station identification, the first set, the IP address and identification success information to the source base station.

8. The method of claim 7, wherein the core network feeding back the address recognition result to the source base station comprises:

and if the target base station identification does not exist, the MME sends the identification result response message carrying the failure reason to the source base station.

9. The method of claim 8, wherein:

the failure reasons include: the base station identity is not present.

10. The method of claim 9, wherein the source base station establishing an X2 interface connection with the neighbor base station based on the first set of base station identification information and the IP address comprises:

after receiving the identification result response message and determining that the identification is successful, the source base station extracts the target base station identifier, the first set and the IP address from the identification result response message and stores the target base station identifier, the first set and the IP address in a base station identifier information record;

the source base station adds the target base station identifier to a target base station identifier list to be established in an X2 interface base station identifier information record to be established;

the source base station acquires all target base station identifications associated with the adjacent base station in the base station identification list to be built so as to generate a target base station identification request list;

and the source base station establishes X2 interface connection with the adjacent base station based on the target base station identification request list and the IP address.

11. The method of claim 10, comprising:

the source base station sends an X2 interface establishment request to the adjacent base station according to the IP address, wherein the X2 interface establishment request carries the target base station identification request list;

and the neighboring base station feeds back an X2 interface response message to the source base station, wherein the X2 interface response message carries all base station identifiers supported by the neighboring base station and cell configuration information corresponding to the target base station identifier in the target base station identifier request list.

12. The method of claim 11, wherein:

if the neighboring base station determines that the X2 interface establishment request does not carry the target base station identifier request list, the X2 interface response message carries cell configuration information corresponding to all base station identifiers supported by the neighboring base station.

13. The method of claim 12, wherein:

after receiving the X2 interface response message and establishing an X2 interface connection, the source base station deletes all target base station identification information associated with the adjacent base station in the to-be-established X2 interface base station identification information record;

and the source base station adds all base station identifications supported by the adjacent base station into the established X2 interface base station identification record.

14. The method of claim 2, comprising:

the first network management system configures whether to start a flexible base station identification recognition mode for the source base station and sets the configuration information;

wherein the configuration information comprises: the maximum base station identifies the value of the number of extended bits X.

15. A method for expanding and configuring base station identifiers is characterized by comprising the following steps:

the base station configures a second base station identity set comprising a plurality of base station identities, wherein the plurality of base station identities comprise: an extended base station identity and a basic base station identity;

the basic base station identification occupies N bits in an evolved universal terrestrial radio access network cell global identity (ECGI), and the bits occupied by the extended base station identification are the N bits and W continuous bits which are in the ECGI and are positioned behind the N bits; wherein, N is a natural number, and W is an expansion bit number;

the base station sends an S1 interface establishment request carrying the second base station identification set to a core network so as to request to establish S1 interface connection corresponding to the second base station identification set;

and the core network returns an S1 interface establishment response message to the base station, and informs an S1 interface establishment result and a verification result of a plurality of base station identifications in the second base station identification set.

16. The configuration method of claim 15, wherein:

the bits occupied by the basic base station identification are the first 20 bits of a Cell Identity IE in the ECGI;

the bits occupied by the extended base station identifier are the bits occupied by the basic base station identifier and the W bits located after the basic base station identifier in the CellIdentity IE.

17. The configuration method of claim 16, wherein:

the sum of the bit number occupied by the Cell identifier Cell ID generated by the base station and the bit number occupied by the base station identifier is 28.

18. The configuration method of claim 16, wherein:

the number of extension bits W is less than or equal to 4;

and the second network management system configures the second base station identification set.

19. The configuration method according to claim 16, wherein the sending, by the base station to a core network, the S1 interface establishment request carrying the second base station identity set specifically includes:

and the base station sends an S1 interface establishment request carrying the second base station identification set to a Mobile Management Entity (MME).

20. The configuration method of claim 19, comprising:

the MME matches a plurality of base station identifications in the second base station identification set with base station identifications already recorded by the MME, and checks whether the plurality of base station identifications have no same base station identification;

if so, the MME records the second base station identification set, and sends an S1 interface response message to the base station to inform S1 that the connection establishment is successful.

21. The configuration method of claim 20, wherein:

after the MME notifies the base station that S1 connection establishment is successful, establishing an S1 interface connection corresponding to the second base station identification set between the MME and the base station;

when the MME determines that a destination base station identifier carried in a received S1 interface message is the same as any base station identifier in the second base station identifier set, the MME judges whether the base station is in the management range of the base station, if so, the MME forwards the S1 interface message carrying the destination base station identifier to the base station through S1 interface connection corresponding to the second base station identifier set; if not, the MME forwards the S1 interface message carrying the destination base station identifier to a core network element to which the base station belongs.

22. The configuration method of claim 20, wherein:

if one or more base station identifications in the second base station identification set are the same as the base station identifications already recorded by the MME, the MME sends an S1 interface response message to the base station to inform S1 of connection failure, and the one or more base station identifications and error reasons are carried in the S1 interface response message.

23. The configuration method of claim 22, wherein:

the error reasons include: the base station identity is not valid.

24. The configuration method of claim 22, wherein:

and when the base station judges that the connection establishment is failed in the S1 mode, sending the one or more base station identifications and the error reasons to a second network management system.

25. A system for establishing an X2 interface connection between base stations, comprising: a source base station, a neighbor base station and core network equipment;

the source base station includes:

the identifier receiving module is used for receiving an evolved universal terrestrial radio access network (ECGI) cell global identifier of a neighboring cell sent by a terminal side;

the identification extraction module is used for extracting a basic base station identification and an extended base station identification from the ECGI according to preset configuration information under the condition of starting a flexible base station identification recognition mode; the basic base station identifier occupies N bits, and the bits occupied by the extended base station identifier are the N bits and X continuous bits after the N bits; wherein, N is a natural number, and X is the maximum base station identification extension bit number;

an identification request sending module, configured to send a target base station identifier identification request carrying the basic base station identifier and the extended base station identifier to a core network;

an identification result receiving module, configured to receive an address identification result fed back by the core network, where the source base station obtains, based on the address identification result, first base station identifier set information and an IP address supported by an adjacent base station to which an adjacent cell belongs;

an X2 connection establishing module, configured to establish an X2 interface connection with the neighboring base station based on the first base station identity set information and the IP address.

26. The system of claim 25, wherein:

the identifier extraction module is specifically configured to extract the first 20 bits of a Cell Identity IE in the ECGI as the basic base station identifier; extracting the X bits positioned after the basic base station Identity in the basic base station Identity and the Cell Identity IE as the extended base station Identity.

27. The system of claim 26, wherein:

wherein, X is one of 1, 2, 3 and 4.

28. The system of claim 25, comprising:

the identification request sending module is further configured to determine whether the basic base station identifier and the extended base station identifier cannot be successfully matched with the base station identifier in the already-established X2 interface base station identifier record; if yes, the source base station sends the request message to MME, and if not, the source base station determines that X2 interface connection is established with the adjacent base station;

wherein the established X2 interface base station identification record is maintained by the recognition result receiving module.

29. The system of claim 28, wherein:

the core network device includes: an MME;

the identification request sending module is specifically configured to send a request message for identifying a target base station identifier to the MME through an S1 interface; wherein, the information carried by the request message at least comprises: the basic base station identification, the extended base station identification and the identification request identification.

30. The system of claim 29, wherein:

the MME comprises:

a target address judging module, configured to match the basic base station identifier and the extended base station identifier with the base station identifier information recorded by the MME, and judge whether a corresponding target base station identifier exists; if the target base station identification exists, determining the first base station identification set to which the target base station identification belongs;

a message forwarding module, configured to forward the request message to the neighboring base station corresponding to the first base station identifier set through an S1 interface;

a TNL address obtaining module, configured to receive an S1 interface message sent by the neighboring base station, and extract the IP address from the S1 interface message.

31. The system of claim 30, wherein:

the MME further comprises:

a recognition result feedback module, configured to obtain other base station identifiers in the first base station identifier set except the target base station identifier to generate a first set; and sending the identification result response message carrying the target base station identification, the first set, the IP address and identification success information to the source base station.

32. The system of claim 29, wherein:

the identification result feedback module is further configured to send the identification result response message carrying the failure reason to the source base station if the target base station identifier does not exist.

33. The system of claim 32, wherein:

the failure reasons include: the base station identity is not present.

34. The system of claim 31, wherein:

the identification result receiving module is further configured to, after receiving the identification result response message and determining that identification is successful, the source base station extracts the target base station identifier, the first set, and the IP address from the identification result response message and stores the target base station identifier, the first set, and the IP address in a base station identifier information record;

the X2 connection establishing module is further configured to acquire all target base station identifiers associated with the neighboring base stations in the to-be-established base station identifier list to generate a target base station identifier request list; and establishing an X2 interface connection with the adjacent base station based on the target base station identification request list and the IP address.

35. The system of claim 34, wherein:

the X2 connection establishing module is specifically configured to send an X2 interface establishing request to the neighboring base station according to the IP address, where the X2 interface establishing request carries the target base station identifier request list;

the neighbor base station includes:

a configuration information feedback module, configured to feed back an X2 interface response message to the X2 connection establishment module, where the X2 interface response message carries all base station identifiers supported by the neighboring base station and cell configuration information corresponding to the target base station identifier in the target base station identifier request list.

36. The system of claim 35, wherein:

the configuration information feedback module is further configured to, if it is determined that the X2 interface establishment request does not carry the target base station identifier request list, fill cell configuration information corresponding to all base station identifiers supported by the neighboring base station in the X2 interface response message.

37. The system of claim 36, wherein:

the X2 connection establishing module is further configured to delete all target base station identification information associated with the neighboring base station in the to-be-established X2 interface base station identification information record after receiving the X2 interface response message and establishing an X2 interface connection; and adding all base station identifications supported by the adjacent base station into the established X2 interface base station identification record.

38. The system of claim 26, further comprising:

the first network management system is used for configuring whether to start a flexible base station identification recognition mode for the source base station and setting the configuration information;

39. A base station identification capacity expansion configuration system is characterized by comprising: a base station and core network equipment;

the base station configures a second base station identity set comprising a plurality of base station identities, wherein the base station identities comprise: an extended base station identity and a basic base station identity;

and the core network equipment returns an S1 interface establishment response message to the base station, and informs an S1 interface establishment result and a verification result of a plurality of base station identifications in the second base station identification set.

40. The system of claim 39, wherein:

the bits occupied by the extended base station identifier are the basic base station identifier occupancy and bits and the W bits located after the basic base station identifier in the CellIdentity IE.

41. The system of claim 40, wherein:

42. The system of claim 41, wherein:

the number of extension bits W is less than or equal to 4;

43. The system of claim 39, wherein:

the core network device includes: a mobility management entity MME;

the base station, comprising:

an interface establishment request unit, configured to send an S1 interface establishment request carrying the second base station identifier set to the MME.

44. The system of claim 43, wherein:

the MME comprises:

an identifier checking unit, configured to match multiple base station identifiers in the second base station identifier set with base station identifiers already recorded by the MME, and check whether the multiple base station identifiers do not have the same base station identifier;

an interface establishment response module, configured to, if none of the multiple base station identifiers in the second base station identifier set has a completely same base station identifier, record, by the MME, the second base station identifier set, send an S1 interface response message to the base station, and notify that the connection establishment is successful in S1.

45. The system of claim 44, wherein:

when the MME determines that a destination base station identifier carried in a received S1 interface message is the same as any base station identifier in the second base station identifier set, the MME judges whether the base station is in the management range of the base station, if so, the MME forwards the S1 interface message carrying the destination base station identifier to the base station through S1 interface connection corresponding to the second base station identifier set; if not, the MME forwards the S1 interface message carrying the destination base station identifier to other core network elements.

46. The system of claim 44, wherein:

the interface establishment response module is further configured to, if one or more base station identifiers in the set of base station identifiers are the same as the base station identifiers already recorded by the MME, send, by the MME, an S1 interface response message to the base station, notify that the connection is failed S1, and carry the one or more base station identifiers and the error cause in this S1 interface response message.

47. The system of claim 46, wherein:

the error reasons include: the base station identity is not valid.

48. The system of claim 46, wherein:

and the base station is further configured to send the one or more base station identifiers and the error reason to the second network management system after determining that the connection establishment at S1 fails.