CN102238572B - Method, device and system for adding neighbor cell - Google Patents
Method, device and system for adding neighbor cell Download PDFInfo
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- CN102238572B CN102238572B CN201010165750.6A CN201010165750A CN102238572B CN 102238572 B CN102238572 B CN 102238572B CN 201010165750 A CN201010165750 A CN 201010165750A CN 102238572 B CN102238572 B CN 102238572B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/20—Interfaces between hierarchically similar devices between access points
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Abstract
The invention discloses a method, device and system for adding a neighbor cell. The method comprises the steps as follows: a source evolved nodeB (eNB) sets up an X2 interface with a target eNB after receiving a neighbor cell measurement report sent by user equipment; and after completing the setup of the X2 interface, the source eNB initiates the deletion of the X2 interface, and triggers the setup of the X2 interface when learning the addition of a neighbor cell. By adopting the immediate setup/deletion mode, the invention ensures the instantaneity during the setup of the X2 interface; and in the controlled mode, the occupation of invalid resources is avoided under the condition that OAM (operations administration and maintenance) does not define neighbor cell addition, thereby improving the use ratio of the resources, reducing the frequent interaction caused by continuous update of the neighboring eNB, and freeing the operator from the tedious work of manual configuration of the neighboring eNB information at the same time.
Description
Technical field
The present invention relates to LTE (Long Term Evolution, Long Term Evolution) system, particularly relate to a kind of method, the Apparatus and system that add abutting subdistrict.
Background technology
In LTE system, eNB (eNodeB, the Node B of evolution) and adjacent eNB set up X2 mouth and obtain neighboring BS information from adjacent eNB, according to the neighboring BS information got, just can make a policy for the X2 of UE (subscriber equipment) switches.
There are two kinds of methods can get the specifying information of abutting subdistrict at present, make a policy for UE carries out X2 switching.
1) configured by backstage.
2) obtained by ANR (Automatic Neighbor Relation, Automatic Neighboring Relation) function.
Below ANR function is simply described:
ANR function is realized by inside of base station, the neighborhood region correlation chart (NRT) on management concept.In ANR function, adjacent area measuring ability finds new adjacent area and is added NRT, and ANR comprises the function that adjacent area is deleted equally, to be deleted by expired syntople.
Neighbor Cell Relation (NR) is defined as follows in ANR:
A) ECGI (the E-UTRAN Cell Global Identifier of Target cell is known, the universal land radio access web global cell identity of evolution)/CGI (global cell identity) and PCI (Physical CellIdentifier, Physical Cell Identifier).
B) in NRT table, there is the record identifying Target cell for cell-of-origin.
C) comprise the attribute defined in NRT, can be arranged by OAM (operation management maintain) or direct allocating default property value.
For each community under eNB, the NRT table that eNB maintenance and management is corresponding, for comprising TCI (Target Cell ID, Target Cell Identifier) in each NR, the NRT in NRT.For E-UTRAN community, TCI represents ECGI and PCI of E-UTRAN Target cell.
ANR function can be opened by OAM or close, and in the enable situation of ANR function, the new neighboring BS information of discovery adopts interpolation or controlled interpolation two kinds of patterns automatically to add NRT to, and these all can be controlled by OAM.
Figure 1 shows that in LTE system, automatic acquisition adjoins the transport addresses information of eNB, sets up X2 mouth and the method for neighboring BS information under obtaining adjacent eNB, sets up X2 mouth below, comprising for source base station eNB1 and target BS eNB2:
101:eNB1 reports by UE the TCI information getting eNB2, eNB1 sends eNB Configuration Transfer (base station configuration transmission) message to MME (mobile switching centre), the information of eNB1 is inserted Source eNB-ID (source eNB-identifies) inner, it is inner that the information of eNB2 inserts Target eNB-ID (target eNB-mark), and select SONInformation (self-organizing network information) for SONInformation Request (SON information request);
After 102:MME receives eNB Configuration Transfer message, judge that the type of SON Information is SON Information Request, then this message is passed through eNB2 by MME, and message is called MME Configuration Transfer (MME configures transmission) message;
After 103:eNB2 receives MME Configuration Transfer message, initiate the eNBConfiguration Transfer message of response to MME, select SON Information to be SONInformation Reply (SON information answer) in this message, in SON Information Reply, fill in IP address and the port numbers of the X2 mouth of eNB1;
After 103:MME receives the eNB Configuration Transfer message of eNB2, judge that SONInformation is SON Information Reply, then this message is passed through eNB1, message is called MME Configuration Transfer;
After 104:eNB1 receives MME Configuration Transfer message, just IP address and the port numbers of the X2 mouth of eNB2 has been got, SCTP (Stream Control Transmission Protocol, SCTP) layer just can set up coupling;
105:eNB1 is after coupling example is successfully established, initiate X2 SETUP REQUEST (X2 sets up request) message to eNB2, the information of eNB1 is inserted in Global eNB ID (overall eNB mark) and Served Cell Information (service cell information);
106:eNB2, after the X2 SETUP REQUEST message receiving eNB1 initiation, initiates X2 SETUP RESPONSE (X2 sets up response) message to eNB1, the information of eNB2 is inserted in GlobaleNB ID and Served Cell Information;
107:eNB1 completes X2 mouth and sets up after the X2 SETUP RESPONSE message receiving eNB2 initiation.
After source eNB receives the TCI information of the target eNB that UE reports in said method, namely set up X2 interface with target eNB, no matter and whether add adjacent area, all can retain set up X2 interface always, cause the huge waste of resource.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method, the Apparatus and system that add abutting subdistrict, solves the problem of resource waste that X2 interface is set up, and realizes setting up X2 interface as required, avoids the waste of resource.
For solving the problems of the technologies described above, a kind of method of adding abutting subdistrict of the present invention, comprising:
The Node B (eNB) of source evolution carries out the foundation of X2 mouth with target eNB after receiving the nearby region measurement report that terminal sends;
After completing the foundation of X2 mouth, source eNB initiates the deletion to this X2 mouth, and when knowing interpolation adjacent area, triggers the foundation of X2 mouth.
Further, source eNB receive nearby region measurement report with target eNB carry out setting up of X2 mouth time, also obtain neighboring BS information, and this neighboring BS information sent to operation management maintain (OAM);
OAM, after receiving neighboring BS information, judges whether to add adjacent area.
Further, if OAM judges to add adjacent area, then carry out adjacent area interpolation, and by adjacent area recording synchronism to source eNB, source eNB, when adjacent area recording synchronism is given this source eNB by OAM, is known and is added adjacent area, trigger the foundation of X2 mouth;
If OAM judges not add adjacent area, then source eNB process ends when not receiving the adjacent area record of OAM.
Further, the method also comprises:
Source eNB receive nearby region measurement report with target eNB carry out setting up of X2 mouth time, also obtain neighboring BS information, and this neighboring BS information sent to OAM;
OAM carries out adjacent area interpolation, and by adjacent area recording synchronism to source eNB, source eNB, when adjacent area recording synchronism is given this source eNB by OAM, is known and added adjacent area, trigger the foundation of X2 mouth.
Further, a kind of device adding abutting subdistrict, comprising: interconnective measurement process module, X2 interface module and X2 resource management module, wherein:
Measurement process module, for after the nearby region measurement report receiving terminal transmission, notice X2 interface module sets up X2 mouth;
X2 interface module, for carrying out the foundation of X2 mouth with target eNB, and after the foundation completing X2 mouth, notice X2 resource management module;
X2 resource management module, for initiating the deletion to X2 mouth, and when knowing interpolation adjacent area, triggers the foundation of X2 mouth.
Further, this device also comprises database, and this database is connected with X2 resource management module;
X2 interface module is when carrying out setting up of X2 mouth with target eNB, also obtain neighboring BS information, and this neighboring BS information is sent to operation management maintain (OAM), adjudicate whether add adjacent area by this OAM, adjacent area is added if judge, then carry out adjacent area interpolation, and by adjacent area recording synchronism to database;
X2 resource management module OAM by adjacent area recording synchronism to database time, know and add adjacent area, trigger the foundation of X2 mouth.
Further, this device also comprises database, and this database is connected with X2 resource management module;
X2 interface module, when carrying out setting up of X2 mouth with target eNB, also obtains neighboring BS information, and this neighboring BS information is sent to OAM, and this OAM carries out adjacent area interpolation, and by adjacent area recording synchronism to database;
X2 resource management module OAM by adjacent area recording synchronism to database time, know and add adjacent area, trigger the foundation of X2 mouth.
Further, a kind of system of adding abutting subdistrict, comprising: the Node B (eNB) of source evolution and target eNB, wherein:
Source eNB, for after the nearby region measurement report receiving terminal transmission, carries out the foundation of X2 mouth with target eNB, after the foundation completing X2 mouth, initiates the deletion to this X2 mouth, and when knowing interpolation adjacent area, trigger the foundation of X2 mouth.
Further, this system also comprises operation management maintain (OAM);
Source eNB receive nearby region measurement report with target eNB carry out setting up of X2 mouth time, also obtain neighboring BS information, and this neighboring BS information sent to OAM; And when adjacent area recording synchronism is given this source eNB by OAM, know and add adjacent area, trigger the foundation of X2 mouth;
OAM, for after receiving neighboring BS information, whether judgement adds adjacent area, adds adjacent area, then carry out adjacent area interpolation if judge, and by adjacent area recording synchronism to source eNB.
Further, this system also comprises operation management maintain (OAM);
Source eNB receive nearby region measurement report with target eNB carry out setting up of X2 mouth time, also obtain neighboring BS information, and this neighboring BS information sent to OAM; And when adjacent area recording synchronism is given this source eNB by OAM, know and add adjacent area, trigger the foundation of X2 mouth;
OAM, for carrying out adjacent area interpolation, and by adjacent area recording synchronism to source eNB after neighboring BS information.
In sum, namely method of the present invention by building the mode of namely deleting, ensure the real-time that X2 mouth is set up, under controlled mode, when OAM does not carry out adjacent area interpolation, avoid taking of invalid resource, improve the utilance of resource, decrease because adjacent eNB constantly updates bring frequent mutual, operator is adjoined the loaded down with trivial details work of eNB information from manual configuration simultaneously and free.
Accompanying drawing explanation
Fig. 1 is that in prior art, source eNB obtains the flow chart that the neighboring BS information of target eNB sets up the method for X2 interface;
Fig. 2 is the flow chart that embodiment 1 obtains that target eNB information sets up the method for X2 mouth;
Fig. 3 is the flow chart that embodiment 2 obtains that target eNB information sets up the method for X2 mouth;
Fig. 4 is the flow chart that application example 1eNB1 obtains that eNB2 information sets up the method for X2 mouth;
Fig. 5 is the flow chart that application example 2eNB1 obtains that eNB2 information sets up the method for X2 mouth;
Fig. 6 is the Organization Chart that embodiment of the present invention adds the device of abutting subdistrict.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.
Embodiment 1:
Fig. 2 is the method that present embodiment adds adjacent area under OAM controlled mode, comprising:
201:UE by measure find adjacent area and to source eNB (eNB1) send nearby region measurement report, report content be under target eNB (eNB2) adjacent area mark TCI, comprising: ECGI and PCI;
202:eNB1 obtains the transport addresses information of eNB2 by MME, and initiates X2SETUP REQUEST message to eNB2;
203:eNB1 is after receiving the X2 SETUP RESPONSE message of eNB2, and X2 mouth has been set up, and gets neighboring BS information;
204:eNB1 initiates the deletion of the X2 mouth between eNB2, example resource shared by release X2 mouth;
205:eNB1 by the adjacent zone information reporting that obtains from X2 SETUP RESPONSE message to OAM;
206:OAM judges whether that adding the community reported is adjacent area, if do not add, then terminates; Otherwise OAM adds adjacent area, and by the adjacent area recording synchronism of interpolation to eNB1;
After the database increase adjacent area record of 207:eNB1, again trigger X2 mouth process of establishing, terminate.
Embodiment 2:
Fig. 3 is the method that present embodiment adds adjacent area under OAM free schema, comprising:
301:UE finds adjacent area report eNB1 by measuring, and reports content to be adjacent area mark TCI under eNB2, comprising: ECGI and PCI;
302:eNB1 obtains the transport addresses information of eNB2 by MME, and initiates X2 SETUPREQUEST message;
303:eNB1 is after receiving the X2 SETUP RESPONSE message of eNB2, and X2 mouth has been set up, and gets neighboring BS information;
304:eNB1 initiates the deletion of the X2 mouth between eNB2, example resource shared by release X2 mouth;
305:eNB1 will obtain adjacent zone information reporting to OAM from X2 SETUP RESPONSE message;
306:OAM adds adjacent area, and by the adjacent area recording synchronism of interpolation to eNB1;
After the database increase adjacent area record of 307:eNB1, again trigger X2 process of establishing, terminate.
Application example 1:
Below in conjunction with accompanying drawing 4, do not add adjacent area for OAM controlled mode making policy decision, this method is described.Precondition is: UE finds adjacent area and reports the ECGI of this adjacent area and PCI information to eNB1.
401:eNB1 is after the neighboring BS information receiving UE transmission, and the transport addresses information obtaining the eNB2 belonging to this adjacent area by MME, comprising: the IP address of the X2 mouth of eNB2 and port numbers;
After 402:eNB1 gets the transport addresses information of adjacent eNB2, initiate X2 SETUPREQUEST message, the information of eNB1 is inserted in Global eNB ID and Served Cell Information, wait for that eNB2 responds;
403:eNB1 obtains the information of eNB2, obtains neighboring BS information after receiving the X2 SETUP RESPONSE message of eNB2 from the Global eNB ID message and Served Cell Information;
404:eNB1 deletes the X2 mouth set up, and the neighboring BS information obtained from X2 SETUP RESPONSE message is issued OAM;
This adjacent area is not added in 405:OAM decision-making, and flow process terminates.
Application example 2:
Below in conjunction with accompanying drawing 5, add adjacent area for acquiescence under OAM free schema, this method is described.Precondition is: UE finds adjacent area and reports the ECGI of this adjacent area and PCI information to eNB1.
501:eNB1, after the neighboring BS information receiving UE discovery, is obtained the transport address of the eNB2 belonging to this adjacent area, comprises IP address and the port numbers of the X2 mouth of target side eNB2 by MME;
After 502:eNB1 gets the transport address of adjacent eNB2, initiate X2 SETUP REQUEST message, the information of eNB1 is inserted in Global eNB ID and Served Cell Information, wait for that eNB2 responds;
503:eNB1 obtains the information of eNB2, obtains neighboring BS information after receiving the X2 SETUP RESPONSE message of eNB2 from the Global eNB ID message and Served Cell Information;
504:eNB1 deletes the X2 mouth set up, and the neighboring BS information obtained from X2 SETUP RESPONSE message is issued OAM;
505:OAM acquiescence adds adjacent area, and the database of eNB1 adds adjacent area record, triggers this X2 mouth and re-establishes.
Figure 6 shows that present embodiment adds the device of abutting subdistrict, comprise interconnective measurement process module, X2 interface module, X2 resource management module and database, wherein:
Measurement process module, for after the nearby region measurement report receiving UE transmission, notice X2 interface module sets up X2 interface, terminal to report content is the adjacent area mark TCI under target eNB (eNB2), comprise: ECGI and PCI, TCI sends to X2 interface module to notify by measurement process module.
X2 interface module, for initiating X2 SETUP REQUEST message to eNB2, after receiving the X2 SETUP RESPONSE message of eNB2, X2 mouth has been set up, and gets neighboring BS information, and after the foundation completing X2 interface, notifies described X2 resource management module.
X2 resource management module, for initiating the deletion of the X2 mouth between eNB2, example resource shared by release X2 mouth, by the adjacent zone information reporting that obtains from X2 SETUP RESPONSE message to OAM, and know add adjacent area time, trigger the foundation of X2 mouth; OAM judges whether that adding the community reported is adjacent area, if do not add, then terminates; Otherwise OAM adds adjacent area, and by the adjacent area recording synchronism of interpolation to database, X2 resource management module, when adjacent area recording synchronism is given described database by OAM, is known and is added adjacent area.
Whether OAM also can not add the judgement of adjacent area, directly carries out adjacent area interpolation, and by adjacent area recording synchronism to database.
Claims (10)
1. add a method for abutting subdistrict, comprising:
The Node B eNB of source evolution carries out the foundation of X2 mouth with target eNB after receiving the nearby region measurement report that terminal sends;
After completing the foundation of described X2 mouth, described source eNB initiates the deletion to this X2 mouth immediately, and when knowing interpolation adjacent area, triggers the foundation of X2 mouth.
2. the method for claim 1, is characterized in that:
Described source eNB receive described nearby region measurement report with described target eNB carry out setting up of X2 mouth time, also obtain neighboring BS information, and this neighboring BS information sent to operation management maintain OAM;
Described OAM, after receiving described neighboring BS information, judges whether to add adjacent area.
3. method as claimed in claim 2, is characterized in that:
If described OAM judges to add adjacent area, then carry out adjacent area interpolation, and adjacent area recording synchronism is given described source eNB, described source eNB described OAM by adjacent area recording synchronism to this source eNB time, know and add adjacent area, trigger the foundation of X2 mouth;
If described OAM judges not add adjacent area, then described source eNB process ends when not receiving the adjacent area record of described OAM.
4. the method for claim 1, is characterized in that, the method also comprises:
Described source eNB receive described nearby region measurement report with described target eNB carry out setting up of X2 mouth time, also obtain neighboring BS information, and this neighboring BS information sent to OAM;
Described OAM carries out adjacent area interpolation, and adjacent area recording synchronism is given described source eNB, described source eNB described OAM by adjacent area recording synchronism to this source eNB time, know and add adjacent area, trigger the foundation of X2 mouth.
5. add a device for abutting subdistrict, comprising: interconnective measurement process module, X2 interface module and X2 resource management module, wherein:
Described measurement process module, for after the nearby region measurement report receiving terminal transmission, notifies that described X2 interface module sets up X2 mouth;
Described X2 interface module, for carrying out the foundation of X2 mouth with target eNB, and after the foundation completing X2 mouth, notifies described X2 resource management module;
Described X2 resource management module, for initiating the deletion to described X2 mouth immediately, and when knowing interpolation adjacent area, triggers the foundation of X2 mouth.
6. device as claimed in claim 5, it is characterized in that: this device also comprises database, this database is connected with described X2 resource management module;
Described X2 interface module is when carrying out setting up of X2 mouth with described target eNB, also obtain neighboring BS information, and this neighboring BS information is sent to operation management maintain OAM, adjudicate whether add adjacent area by this OAM, adjacent area is added if judge, then carry out adjacent area interpolation, and give described database by adjacent area recording synchronism;
Described X2 resource management module, when adjacent area recording synchronism is given described database by described OAM, is known and is added adjacent area, trigger the foundation of X2 mouth.
7. device as claimed in claim 5, it is characterized in that: this device also comprises database, this database is connected with described X2 resource management module;
Described X2 interface module, when carrying out setting up of X2 mouth with described target eNB, also obtains neighboring BS information, and this neighboring BS information is sent to OAM, and this OAM carries out adjacent area interpolation, and gives described database by adjacent area recording synchronism;
Described X2 resource management module, when adjacent area recording synchronism is given described database by described OAM, is known and is added adjacent area, trigger the foundation of X2 mouth.
8. add a system for abutting subdistrict, comprising: the Node B eNB of source evolution and target eNB, wherein:
Described source eNB, for after the nearby region measurement report receiving terminal transmission, carries out the foundation of X2 mouth with described target eNB, after the foundation completing described X2 mouth, initiates the deletion to this X2 mouth immediately, and when knowing interpolation adjacent area, trigger the foundation of X2 mouth.
9. system as claimed in claim 8, it is characterized in that, this system also comprises operation management maintain OAM;
Described source eNB receive described nearby region measurement report with described target eNB carry out setting up of X2 mouth time, also obtain neighboring BS information, and this neighboring BS information sent to described OAM; And when adjacent area recording synchronism is given this source eNB by described OAM, know and add adjacent area, trigger the foundation of X2 mouth;
Described OAM, for after receiving described neighboring BS information, whether judgement adds adjacent area, adds adjacent area, then carries out adjacent area interpolation, and give described source eNB by adjacent area recording synchronism if judge.
10. system as claimed in claim 8, is characterized in that: this system also comprises operation management maintain OAM;
Described source eNB receive described nearby region measurement report with described target eNB carry out setting up of X2 mouth time, also obtain neighboring BS information, and this neighboring BS information sent to OAM; And when adjacent area recording synchronism is given this source eNB by described OAM, know and add adjacent area, trigger the foundation of X2 mouth;
Described OAM, for carrying out decision-making after receiving neighboring BS information, the result of decision-making is likely add or do not add,
If the result of decision is not added, then terminate; If the result of decision is added, then carry out interpolation adjacent area, and give described source eNB by adjacent area recording synchronism.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010165750.6A CN102238572B (en) | 2010-05-05 | 2010-05-05 | Method, device and system for adding neighbor cell |
| PCT/CN2010/077590 WO2011137628A1 (en) | 2010-05-05 | 2010-10-08 | Method, apparatus and system for adding neighbor cells |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010165750.6A CN102238572B (en) | 2010-05-05 | 2010-05-05 | Method, device and system for adding neighbor cell |
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| Publication Number | Publication Date |
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| CN102238572A CN102238572A (en) | 2011-11-09 |
| CN102238572B true CN102238572B (en) | 2015-06-03 |
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| CN201010165750.6A Expired - Fee Related CN102238572B (en) | 2010-05-05 | 2010-05-05 | Method, device and system for adding neighbor cell |
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| CN (1) | CN102238572B (en) |
| WO (1) | WO2011137628A1 (en) |
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| RU2590907C1 (en) * | 2012-09-11 | 2016-07-10 | Хуавэй Текнолоджиз Ко., Лтд. | Method and device for obtaining information of neighbouring cells |
| EP2787751A4 (en) * | 2013-01-30 | 2014-12-17 | Huawei Tech Co Ltd | Method for automatically deleting 2 configuration, base station, and network system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272607A (en) * | 2007-03-21 | 2008-09-24 | 北京三星通信技术研究有限公司 | Method for indicating data transmission completeness |
| CN101370262A (en) * | 2007-08-15 | 2009-02-18 | 中兴通讯股份有限公司 | Neighbor section list updating method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4998133B2 (en) * | 2007-08-07 | 2012-08-15 | 富士通株式会社 | Mobile communication system and link establishment method |
| CN101605314A (en) * | 2008-06-11 | 2009-12-16 | 中兴通讯股份有限公司 | The neighbor relationship management method that is used for long evolving system |
| CN101668307B (en) * | 2008-09-02 | 2012-10-03 | 华为技术有限公司 | Method, system and equipment for communication |
| CN101668277B (en) * | 2008-09-05 | 2012-09-05 | 中兴通讯股份有限公司 | Base station relationship management method, base station relationship management device and station relationship management system |
| CN101674667B (en) * | 2008-09-10 | 2012-01-11 | 中兴通讯股份有限公司 | Method for managing X2 connection relation among base stations |
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2010
- 2010-05-05 CN CN201010165750.6A patent/CN102238572B/en not_active Expired - Fee Related
- 2010-10-08 WO PCT/CN2010/077590 patent/WO2011137628A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272607A (en) * | 2007-03-21 | 2008-09-24 | 北京三星通信技术研究有限公司 | Method for indicating data transmission completeness |
| CN101370262A (en) * | 2007-08-15 | 2009-02-18 | 中兴通讯股份有限公司 | Neighbor section list updating method and system |
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| CN102238572A (en) | 2011-11-09 |
| WO2011137628A1 (en) | 2011-11-10 |
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