CN102149149A - Method and equipment for detecting physical layer cell identifier (PCI) conflict - Google Patents
Method and equipment for detecting physical layer cell identifier (PCI) conflict Download PDFInfo
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Abstract
The invention discloses a method and equipment for detecting a physical layer cell identifier (PCI) conflict. The method comprises the following steps that: a second base station receives a configuration updating message sent from the adjacent first base station, wherein the message carries the PCI configuration information of the detected cell Si of the first base station; the second base station determines that the PCI of the detected cell Si is available according to the message when detecting that the detected cell Si is adjacent to the cell of the second base station, that the PCI of the cell of the second base station is not conflicted with that of the detected cell Si or is not confused with the PCI of the cell adjacent to the detected cell Si, and that the PCI of the detected cell Si is not confused with that of the cell adjacent to the cell of the second base station. By the invention, the flow of PCI conflict detection is simplified, the design complexity is reduced, the test cost and maintenance cost of the product are reduced; besides, the complexity of network parameter planning is reduced, the reliable operation of the network system is guaranteed and the relationship between serving cells is optimized.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of PCI collision detection method and equipment.
Background technology
In the LTE system, the base station can certain sub-district of self-configuring PCI, and according to agreement TS 36.300, LTE(Long Term Evolution, Long Term Evolution) 504 PCI(Physical Layer Cell ID have been defined in the system, physical-layer cell identifier) numerical value (0..503) like this, must have the situation that identical PCI is used in different sub-districts.If use two center of housing estate frequencies of identical PCI also identical, then can cause serious presence of intercell interference.Therefore, the automatic configuration of sub-district PCI must be satisfied the requirement that PCI does not conflict and do not obscure.Wherein PCI does not conflict and refers to that any two adjacent co-frequency cells all can not use same PCI; PCI does not obscure finger can not have any two co-frequency cells to use identical PCI in all adjacent areas of a sub-district.
According to UE(User Equipment, subscriber equipment) initiatively measures, to eNB(evolved Node B, evolved base station) reports the discovery adjacent area, and set up process message and adjacent eNB Serving cell and neighboring BS information are obtained in the eNB config update from the X2 of X2 interface, can detect the conflict of PCI and obscure.The purpose of PCI collision detection is exactly that the PCI that reaches co-frequency cell does not conflict and the purpose of not obscuring.
When the actual deployment network, LTE(Long Term Evolution, Long Term Evolution) the base station applies environment in the system as shown in Figure 1, for eNB(Evolved Node B, the base station) implementation, be X2 link, eNB and MME(Mobility Management Entity between eNB and the eNB, Mobility Management Entity)/S-GW(Serving Gateway, gateway) between be the S1 link; And the S1 link between X2 link, eNB and the MME/S-GW between eNB and the eNB all will adopt SCTP(Stream Control Transmssion Protocol, SCTP).
As shown in Figure 1, the X2 link is between eNB and eNB, and the S1 link is between eNB and MME/S-GW.The S1 link provides the Radio Resource in the visit wireless access network, comprises control plane function and user-plane function; The signaling bear function that the chain of command interface (S1-MME) of S1 link provides the application protocol between eNB and the MME and is used to transmit application protocol message; The interface in the user plane of S1 link (S1-U) provides the function of the user plane data transfer between eNB and the S-GW.The main purpose that the X2 link exists is to support the mobile management function of the UE under the LTE-ACTIVE state; In addition, X2 link major function also comprises the load management function; The coordinating district interference function; General X2 management and wrong controlled function etc.
As shown in Figure 2, base station S has sub-district Sx, Sy, Si, wherein, the adjacent sub-district of Si have (x, y), the adjacent sub-district of Sx have (Si, z).If revised after the PCI of sub-district Si, need to trigger the PCI collision detection, amended PCI also can be notified to base station R by the X2 config update simultaneously.The schematic flow sheet of PCI collision detection method comprises as shown in Figure 3 in the prior art:
Step 4: variation has taken place in sub-district PCI in the S of base station, needs to trigger the X2 config update and tells adjacent base station R;
Step 5～12: base station R is after notified message, and the PCI collision detection is done in all sub-districts in the R of circulation base station.If Si is the adjacent sub-district of sub-district Rj in the R of base station, need to guarantee that Rj does not conflict with the PCI of Si, PCI does not obscure between all adjacent sub-districts of Si and Rj, PCI does not obscure, also needs simultaneously to guarantee that all interior affair sub-district PCI that are taken in small doses at short intervals together of Rj and base station S do not obscure between all adjacent sub-districts of Rj and Si; If Si is not the adjacent sub-district of Rj, judge by tabling look-up again whether Rj is the adjacent sub-district of Si, if need then to guarantee that PCI does not obscure, also needs simultaneously to guarantee that Si does not conflict with the affair sub-district PCI that are taken in small doses at short intervals with all of base station R between all co-frequency neighbor cells of Si and Rj.
In the process that realizes the embodiment of the invention, the applicant finds that there is following problem at least in prior art:
For big capacity BBU(Building Base band Unit, indoor baseband processing unit), the frequency and the PCI of the adjacent area of another one sub-district are identical in the frequency that might have a sub-district fully and PCI and this station, therefore, when there were neighboring BS relationship in certain sub-district, adjacent base station and certain sub-district, this base station, then this sub-district of adjacent base station can not exist the detection of PCI conflict there is no need with all the affair sub-districts that are taken in small doses at short intervals together in this base station in the prior art.
Summary of the invention
The object of the present invention is to provide low PCI collision detection method and the equipment of having optimized neighboring BS relationship simultaneously of a kind of complexity, for this reason, the embodiment of the invention adopts following technical scheme:
A kind of method of PCI collision detection comprises:
Second base station receives the configuration update message that its first adjacent base station sends, and wherein carries the PCI configuration information of the detected sub-district Si of first base station;
Described second base station is according to described message, in the adjacent sub-district that to detect described detected sub-district Si be second base station cell, and second base station cell does not conflict with the PCI of described detected sub-district Si, do not obscure with the PCI of the adjacent sub-district of described detected sub-district Si, when the adjacent sub-district PCI of the described detected sub-district Si and second base station cell does not obscure, determine that the PCI of described detected sub-district Si can use.
The embodiment of the invention also provides a kind of base station, comprising:
Receiver module is used to receive the configuration update message that adjacent base station sends, and wherein carries the PCI configuration information of the described detected sub-district Si in adjacent base station;
Second detection module, be used for the described message that receives according to described receiver module, when detecting the detected sub-district Si in described adjacent base station and be the adjacent sub-district of this base station cell, detect this base station cell and whether conflict, whether obscure with the PCI of the adjacent sub-district of the described detected sub-district Si in adjacent base station and whether obscure the adjacent sub-district of the described detected sub-district Si in adjacent base station and this base station cell with the PCI of the described detected sub-district Si in adjacent base station;
Determination module, being used for detecting this base station cell at described second detection module does not conflict with the PCI of the described detected sub-district Si in adjacent base station, do not obscure with the PCI of the detected adjacent cells of cells in described adjacent base station, and when does not obscure the adjacent sub-district of the described detected sub-district Si in adjacent base station and this base station cell, determine that the PCI of the described detected sub-district Si in adjacent base station can use.
In the embodiment of the invention, allow on the basis of existing PCI detection method among the big capacity BBU, the frequency and the PCI of the adjacent area of another one sub-district are identical in the frequency that has a sub-district and PCI and this station.On the one hand, simplified the flow process of PCI collision detection, reduced the complexity of design, the testing cost of product and maintenance cost have also obtained reduction, have simplified the complexity of network parameter planning simultaneously, have guaranteed the reliability service of network system; On the other hand, optimized the neighboring BS relationship of Serving cell.
Description of drawings
Fig. 1 is existing LTE system architecture schematic diagram;
Fig. 2 is that the sub-district neighbor cell configuration concerns schematic diagram in base station S and the base station R;
Fig. 3 is the schematic flow sheet of existing PCI collision detection method;
The schematic flow sheet of the PCI collision detection method that Fig. 4 A ~ 4B provides for the embodiment of the invention;
The schematic flow sheet of the PCI collision detection method that Fig. 5 provides for another embodiment of the present invention;
The structural representation of the base station that Fig. 6 provides for the embodiment of the invention.
Embodiment
In the existing P CI collision detection method, when needing to guarantee that there are neighboring BS relationship in certain sub-district, adjacent base station and certain sub-district, this base station, can not there be the PCI conflict in this sub-district of adjacent base station with all the affair sub-districts that are taken in small doses at short intervals together in this base station.But for big capacity BBU, the frequency and the PCI of the adjacent area of another one sub-district are identical in the frequency that might have a sub-district fully and PCI and this station.Scene shown in Fig. 2, if Si is the adjacent sub-district of Rj, the center frequency point of supposing Rj is 23100, PCI is 1, center frequency point and the PCI of sub-district Sy also are respectively 23100,1 in the S of base station, if Si is the adjacent sub-district of Rj, in the then existing PCI collision detection method, Rj has PCI to conflict with Sy.But this situation allows in the network operation.UE is after finding an adjacent sub-district by A3 reporting events notice, the center frequency point and the PCI that can not only report by this UE think that detected adjacent area is this base station, also need ID to UE configuration CGI(Cell Global, Cell Global Identity) reports, determine the CGI information of this neighbour sub-district, therefore, when guaranteeing that there are neighboring BS relationship in certain sub-district, adjacent base station and certain sub-district, this base station, it is unnecessary that can not there be the PCI conflict in this sub-district of adjacent base station with all the affair sub-districts that are taken in small doses at short intervals together in this base station.
In addition, the situation of UE flase drop may appear in existing PCI collision detection method.Scene as shown in Figure 2, Si is the adjacent sub-district of Rj, and UE is behind center frequency point that measures Rj and PCI in the Serving cell Si, and Si is based on the collision detection flow process of Fig. 3, can think that UE is detected to be certain Serving cell in this base station, rather than real Rj.The situation of handoff failure may appear in follow-up like this UE when doing processes such as switching, can not guarantee the true(-)running of network
At the above-mentioned problems in the prior art, the embodiment of the invention provides a kind of method of PCI collision detection: on the one hand, simplified the flow process of PCI collision detection, reduced the complexity of design, the testing cost of product and maintenance cost have also obtained reduction, simplify the complexity of network parameter planning simultaneously, guaranteed the reliability service of network system; On the other hand, optimized the neighboring BS relationship of Serving cell.
Below in conjunction with the accompanying drawing in the embodiments of the invention, the technical scheme in the embodiments of the invention is clearly and completely described, obviously, the embodiments described below only are the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of embodiments of the invention protection.
Shown in Fig. 4 A, the schematic flow sheet of a kind of PCI collision detection method that provides for the embodiment of the invention can may further comprise the steps:
Wherein, first base station can specifically comprise to the configuration update message that its second adjacent base station sends: first base station detects the detected sub-district of this base station and does not conflict with the PCI of its adjacent sub-district, and when the PCI of adjacent cells of cells adjacent with it does not obscure, send configuration update message to second base station.
Concrete, the detection of PCI conflict can be in this base station of first base station configuration triggers behind the PCI of certain sub-district automatically, to guarantee that this sub-district and other do not clash with the PCI of the affair sub-districts that are taken in small doses at short intervals or obscure, for this reason, whether at first need to detect between this sub-district (being detected sub-district) and its adjacent sub-district exists PCI to conflict, wherein, the information of adjacent sub-district can be obtained by inquiring about detected adjacent cells of cells information table; If this detected sub-district is the adjacent sub-district of certain sub-district (as sub-district Sx), whether the PCI that also needs to detect the adjacent sub-district of this detected sub-district and sub-district Sx obscures in addition; When not conflicting with adjacent sub-district PCI in detected sub-district, and when not obscuring with the adjacent sub-district PCI of sub-district Sx, first base station need send to second base station that is adjacent with detected sub-district, this base station PCI configuration information, wherein, can notify adjacent base station by the mode that triggers the X2 config update.
Concrete, when second base station receives the configuration update message of first base station transmission that is adjacent, can carry out the PCI collision detection to the sub-district in second base station, concrete, second base station can be by adjacent cells of cells information table in the inquiry base station, whether the detected sub-district of judging first base station is certain adjacent cells of cells in second base station, when the detected sub-district of first base station is in second base station during certain adjacent cells of cells, need to guarantee that second base station cell does not conflict with the detected sub-district PCI of first base station, the adjacent sub-district PCI of the detected sub-district of first base station and second base station cell does not obscure, the detected adjacent cells of cells PCI of second base station cell and first base station does not obscure.When the detected sub-district of first base station is not the adjacent cells of cells of second base station, and when second base station cell is the detected adjacent cells of cells of first base station, need also to guarantee that the detected sub-district of first base station and the adjacent sub-district PCI of second base station cell do not obscure, therefore, shown in Fig. 4 B, the PCI collision detection algorithm that the embodiment of the invention provides can also comprise:
In embodiments of the present invention, consider the situation of big capacity BBU, the center frequency point and the PCI of certain sub-district may be identical in the PCI of the adjacent sub-district that UE reports in certain Serving cell and center frequency point and this Serving cell, so need not to guarantee in the target BS that the PCI of all co-frequency cells is inequality in this sub-district and source base station.
It should be noted that when sub-district A is the adjacent sub-district of sub-district B, can be with the possible adjacent sub-district of sub-district B as sub-district A, and all co-frequency neighbor cells that need to guarantee sub-district B and sub-district A do not exist PCI to obscure.This has guaranteed that the UE in the Serving cell A can the successful adjacent sub-district that sub-district B is added to sub-district A after center frequency point that detects sub-district B and PCI information.
By the technical scheme that the embodiment of the invention provides, on the one hand, simplified the flow process of PCI collision detection, reduced the complexity of design, the testing cost of product and maintenance cost have also obtained reduction, have simplified the complexity of network parameter planning simultaneously, have guaranteed the reliability service of network system; On the other hand, optimized the neighboring BS relationship of Serving cell.
Below in conjunction with concrete application scenarios the technical scheme that the embodiment of the invention provides is carried out more detailed description.
As shown in Figure 5, the PCI collision detection method that provides for the embodiment of the invention is applied in the schematic flow sheet under as shown in Figure 2 the application scenarios, and after the PCI of sub-district Si revised, this method flow may further comprise the steps:
Whether step 501, base station S detect Si and exist PCI to conflict with Sx, Sy; Be to determine that then amended PCI is unavailable, flow process finishes; Otherwise, go to step 502;
Whether step 503, base station S detect Si and exist PCI to obscure with the adjacent sub-district z of Sx; Be to determine that then amended PCI is unavailable, flow process finishes; Otherwise, go to step 504;
Step 504, base station S change the PCI of Si by the X2 configuration update message and are notified to base station R;
After step 505, base station R receive notification message, judge whether Si is the adjacent sub-district of Rj; Be then to go to step 506; Otherwise, go to step 509;
Whether step 506, base station R detect Rj and conflict with the PCI of Si; Be to determine that then amended PCI is unavailable, flow process finishes; Otherwise, go to step 507;
Whether exist PCI to obscure between the adjacent sub-district of step 507, base station R detection Si and Rj; Be to determine that then amended PCI is unavailable, flow process finishes; Otherwise, go to step 508;
Whether exist PCI to obscure between the adjacent sub-district of step 508, base station R detection Rj and Si; Be to determine that then amended PCI is unavailable, flow process finishes; Otherwise, determine that amended PCI can use, flow process finishes;
Whether exist PCI to obscure between the adjacent sub-district of step 510, base station R detection Si and Rj; Be to determine that then amended PCI is unavailable, flow process finishes; Otherwise, determine that amended PCI can use, flow process finishes.
By the technical scheme that the embodiment of the invention provides, on the one hand, simplified the flow process of PCI collision detection, reduced the complexity of design, the testing cost of product and maintenance cost have also obtained reduction, have simplified the complexity of network parameter planning simultaneously, have guaranteed the reliability service of network system; On the other hand, optimized the neighboring BS relationship of Serving cell.
Based on the identical inventive concept of said method embodiment, the embodiment of the invention also provides a kind of base station equipment, and this base station equipment can dispose the PCI of sub-district in this base station, and as shown in Figure 6, the structural representation of the base station equipment that provides for the embodiment of the invention comprises:
Wherein, second detection module 64 also is used for, the message that receives according to receiver module 63, when the detected sub-district that detects adjacent base station was not the adjacent sub-district of this base station cell, whether the PCI that detects this cell base station and whether be the adjacent sub-district of the detected adjacent cells of cells in adjacent base station and detected sub-district, adjacent base station and this base station cell obscured;
Above-mentioned base station can also comprise:
Whether first detection module 61 is used to detect detected sub-district, this base station and conflicts with the PCI of its adjacent sub-district, and whether the PCI of adjacent cells of cells adjacent with it obscures;
Sending module 62 is used for detecting detected sub-district, this base station and not conflicting with the PCI of its adjacent sub-district when first detection module 61, and the PCI of adjacent cells of cells adjacent with it is not when obscuring, to adjacent base station transmission configuration update message.
Wherein, sending module 62 can send to adjacent base station by the configuration update message that X2 interface will carry detected sub-district, this base station PCI configuration information.
By the technical scheme that the embodiment of the invention provides, on the one hand, simplified the flow process of PCI collision detection, reduced the complexity of design, the testing cost of product and maintenance cost have also obtained reduction, have simplified the complexity of network parameter planning simultaneously, have guaranteed the reliability service of network system; On the other hand, optimized the neighboring BS relationship of Serving cell.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a station terminal equipment (can be mobile phone, personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be looked protection scope of the present invention.
Claims (9)
1. physical-layer cell identifier PCI collision detection method is characterized in that this method comprises:
Second base station receives the configuration update message that its first adjacent base station sends, and wherein carries the PCI configuration information of the detected sub-district Si of first base station;
Described second base station is according to described message, in the adjacent sub-district that to detect described detected sub-district Si be second base station cell, and second base station cell does not conflict with the PCI of described detected sub-district Si, do not obscure with the PCI of the adjacent sub-district of described detected sub-district Si, when the adjacent sub-district PCI of the described detected sub-district Si and second base station cell does not obscure, determine that the PCI of described detected sub-district Si can use.
2. the method for claim 1 is characterized in that, also comprises:
Second base station is in adjacent sub-district that to detect described detected sub-district Si be not second base station cell, and detecting second base station cell is the adjacent sub-district of described detected sub-district Si, and when the adjacent sub-district PCI of the described detected sub-district Si and second base station cell does not obscure, determine that the PCI of described detected sub-district Si can use.
3. the method for claim 1 is characterized in that, the detected sub-district Si in first base station is the adjacent sub-district of the first base station cell Sx, and first base station comprises to the process of the configuration update message of its second adjacent base station transmission:
The detected sub-district Si that first base station detects this base station does not conflict with the PCI of its adjacent sub-district, and when not obscuring with the PCI of the adjacent sub-district of sub-district Sx, sends configuration update message to second base station.
4. as claim 1,2 or 3 described methods, it is characterized in that described second base station receives the configuration update message that its first adjacent base station sends, and is specially:
Second base station receives the described configuration update message that first base station sends by X2 interface.
5. as claim 1,2 or 3 described methods, it is characterized in that the described PCI PCI that is specially co-frequency neighbor cell that do not conflict is inequality, it is inequality that described PCI does not obscure the PCI of the co-frequency neighbor cell that is specially a sub-district.
6. a base station is characterized in that, comprising:
Receiver module is used to receive the configuration update message that adjacent base station sends, and wherein carries the PCI configuration information of the described detected sub-district Si in adjacent base station;
Second detection module, be used for the described message that receives according to described receiver module, when detecting the detected sub-district Si in described adjacent base station and be the adjacent sub-district of this base station cell, detect this base station cell and whether conflict, whether obscure with the PCI of the adjacent sub-district of the described detected sub-district Si in adjacent base station and whether obscure the adjacent sub-district of the described detected sub-district Si in adjacent base station and this base station cell with the PCI of the described detected sub-district Si in adjacent base station;
Determination module, being used for detecting this base station cell at described second detection module does not conflict with the PCI of the described detected sub-district Si in adjacent base station, do not obscure with the PCI of the adjacent sub-district of the described detected sub-district Si in adjacent base station, and when does not obscure the adjacent sub-district of the described detected sub-district Si in adjacent base station and this base station cell, determine that the PCI of the described detected sub-district Si in adjacent base station can use.
7. the base station described in claim 6 is characterized in that,
Described second detection module also is used for, the described message that receives according to described receiver module, when the detected sub-district Si that detects described adjacent base station was not the adjacent sub-district of this base station cell, whether the PCI that detects the adjacent sub-district of adjacent sub-district that whether this cell base station is the described detected sub-district Si in adjacent base station and the described detected sub-district Si in adjacent base station and this base station cell obscured;
Described determination module also is used for, when described second detection module detects the adjacent sub-district that this base station cell is the described detected sub-district Si in adjacent base station, and when the PCI of the adjacent sub-district of the described detected sub-district Si in adjacent base station and this base station cell does not obscure, determine that the PCI of the described detected sub-district Si in adjacent base station can use.
8. base station as claimed in claim 6 is characterized in that, the detected sub-district Si in this base station is the adjacent sub-district of sub-district Sx, and this base station also comprises:
Whether first detection module is used to detect the detected sub-district Si in this base station and conflicts with the PCI of its adjacent sub-district, and whether the PCI of adjacent cells of cells adjacent with it obscures;
Sending module is used for detecting the detected sub-district Si in this base station and not conflicting with the PCI of its adjacent sub-district when described first detection module, and when not obscuring with the PCI of the adjacent sub-district of sub-district Sx, to adjacent base station transmission configuration update message.
9. base station as claimed in claim 8 is characterized in that,
Described sending module specifically is used for, and sends configuration update message by X2 interface to adjacent base station;
Described receiver module specifically is used for, and receives the configuration update message that adjacent base station sends by X2 interface.
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| CN103260200A (en) * | 2012-02-16 | 2013-08-21 | 电信科学技术研究院 | Method, system and equipment for sending adjacent cell information of different systems and establishing adjacent region relationships |
| CN103260200B (en) * | 2012-02-16 | 2016-05-18 | 电信科学技术研究院 | Send different system neighboring BS information and method, system and the equipment of setting up neighboring BS relationship |
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| CN104168577A (en) * | 2014-08-06 | 2014-11-26 | 武汉虹翼信息有限公司 | Whole-network LTE cell PCI planning method and device |
| CN104168577B (en) * | 2014-08-06 | 2018-02-02 | 武汉虹信技术服务有限责任公司 | A kind of the whole network LTE cells PCI method and device for planning |
| US20220022060A1 (en) * | 2019-03-30 | 2022-01-20 | Huawei Technologies Co., Ltd. | PCI Conflict Detection And Optimization Method, Apparatus, And System |
| CN112261697A (en) * | 2020-10-13 | 2021-01-22 | 中国移动通信集团内蒙古有限公司 | Data updating method, device, equipment and computer storage medium |
| CN112261697B (en) * | 2020-10-13 | 2023-04-14 | 中国移动通信集团内蒙古有限公司 | Data updating method, device, equipment and computer storage medium |
| CN113596866A (en) * | 2021-06-07 | 2021-11-02 | 安科讯(福建)科技有限公司 | PCI self-configuration self-optimization method and device |
| CN113596866B (en) * | 2021-06-07 | 2023-11-21 | 安科讯(福建)科技有限公司 | PCI self-configuration self-optimization method and device |
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