CN103533549A - Distribution method and device for physical cell identities - Google Patents
Distribution method and device for physical cell identities Download PDFInfo
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- CN103533549A CN103533549A CN201210233026.1A CN201210233026A CN103533549A CN 103533549 A CN103533549 A CN 103533549A CN 201210233026 A CN201210233026 A CN 201210233026A CN 103533549 A CN103533549 A CN 103533549A
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Abstract
The invention discloses a distribution method and device for physical cell identities. The method includes: in initial power-up, a network device acquires a physical-cell-identity table (PCI_Table) from an adjacent network device, wherein in the PCI_Table, occupancy information of a PCI of a cell under the network device and occupancy information of PCIs of the adjacent cell and an adjacent cell of the adjacent cell are marked; and the network device selecting an unoccupied PCI as the PCI of the cell of the network device itself and generating a PCI_Table of the network device according to the marked occupancy information of the PCIs in the acquired PCI_Table. The distribution method and device for the physical cell identities are capable of improving PCI distribution efficiency and reducing complexity of the distribution process and probabilities of another conflict or confusion generated by the distribution and solving a problem that newly-established base stations cannot be distributed at high efficiency in a concentrated distribution process at the same time.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of distribution method and device of Physical Cell Identifier.
Background technology
Along with the development of network technology and the communication technology, LTE (Long Term Evolution, Long Term Evolution) receives much attention with features such as its high data rate, low delay, grouping transmission.
Physical Cell Identifier (PCI) is that LTE network is used for the sign of unique definite Yi Ge community in physical layer, and for generation of synchronizing signal, user terminal (UE) can be determined its residing community by this synchronizing signal.The span of PCI is 0～503, this just means the identical situation of PCI meeting ubiquity in network, and the conflict of PCI (as shown in Figure 1, the PCI of neighbor cell is identical) and obscure (as shown in Figure 2, the PCI of two adjacent areas of some communities is identical) can cause UE access or handoff failure, to the reasonable distribution of PCI, be therefore the important content of LTE system network planning always.
At present the planning of PCI is divided into manual assignment and is automatically distributed; Automatically distribution is divided into again centralized and distributed.
Due to the intervention of distributed allocation scheme without OMC (operation maintenance center), improved promptness and flexibility that PCI distributes, therefore more have superiority.But there is algorithm more complicated, sometimes need repeatedly to calculate the restrictions such as correlation between neighbor cell.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of distribution method and device of Physical Cell Identifier, can reduce the complexity that Physical Cell Identifier distributes.
For solving the problems of the technologies described above, the distribution method of a kind of Physical Cell Identifier of the present invention, comprising:
The network equipment is when initially powering on, from the contiguous network equipment, obtain Physical Cell Identifier list (PCI_Table), in described PCI_Table, be marked with the occupied information of PCI of abutting subdistrict of occupied information, abutting subdistrict and the abutting subdistrict of the PCI of community under present networks equipment;
The described network equipment is according to the occupied information of the PCI of mark in the PCI_Table obtaining, selects unappropriated PCI as the PCI of self community, and generates the PCI_Table of self.
Further, also comprise:
The described network equipment is after the PCI that selects unappropriated PCI as self community, by selected PCI, notify abutting subdistrict, and by abutting subdistrict, selected PCI is notified to the abutting subdistrict of abutting subdistrict, the occupied information of PCI is upgraded in the abutting subdistrict of indication abutting subdistrict and abutting subdistrict in PC_Table separately.
Further, generate the PCI_Table of self, comprising:
The described network equipment filters the occupied information of the PCI of the abutting subdistrict that obtains abutting subdistrict and abutting subdistrict from the PCI_Table obtaining, in the PCI_Table of self, carry out mark, and by the occupied information mark of the PCI of self community in the PCI_Table of self.
Further, also comprise:
Whether the described network equipment in running, when finding PCI conflict or obscuring, is waited for a random time, and is detected PCI conflict or obscure and eliminate, if do not eliminated, the PCI clashing or obscure is revised as to unappropriated PCI.
Further, also comprise:
The described network equipment is being revised as the PCI clashing or obscure after unappropriated PCI, by amended PCI, notify abutting subdistrict, and by abutting subdistrict, amended PCI is notified to the abutting subdistrict of abutting subdistrict, stop PCI conflict or the conflict of the respective cell of obscuring or obscure processing.
Further, a kind of distributor of Physical Cell Identifier, comprising: information interaction module, processing module and memory module, wherein:
Described information interaction module, for when initially powering on, from the contiguous network equipment, obtain Physical Cell Identifier list (PCI_Table), in described PCI_Table, be marked with the occupied information of PCI of abutting subdistrict of occupied information, abutting subdistrict and the abutting subdistrict of the PCI of community under present networks equipment;
Described processing module, for according to the occupied information of the PCI of the PCI_Table mark that obtains, selects unappropriated PCI as the PCI of self community, and generates the PCI_Table of self;
Described memory module, the PCI_Table generating for storing described processing module.
Further, described information interaction module, also for selecting in described processing module after the PCI of unappropriated PCI as self community, by selected PCI, notify abutting subdistrict, and by abutting subdistrict, selected PCI is notified to the abutting subdistrict of abutting subdistrict, the occupied information of PCI is upgraded in the abutting subdistrict of indication abutting subdistrict and abutting subdistrict in PCI_Table separately.
Further, described processing module, specifically for filtering the occupied information of the PCI of the abutting subdistrict that obtains abutting subdistrict and abutting subdistrict the PCI_Table from obtaining, in the PCI_Table of self, carry out mark, and by the occupied information mark of the PCI of self community in the PCI_Table of self.
Further, described processing module, also at running, when finding PCI conflict or obscuring, wait for a random time, and detect PCI conflict or obscure and whether eliminate, if do not eliminate, the PCI clashing or obscure be revised as to unappropriated PCI.
Further, described information interaction module, also for the PCI clashing or obscure being revised as after unappropriated PCI in described processing module, by amended PCI, notify abutting subdistrict, and by abutting subdistrict, amended PCI is notified to the abutting subdistrict of abutting subdistrict, stop PCI conflict or the conflict of the respective cell of obscuring or obscure processing.
In sum, the present invention can improve the efficiency that PCI distributes, and reduces the complexity of allocation flow and distribute the probability that again conflicts or obscure causing.Meanwhile, also solved centralized distribution put in process cannot be to the base station efficient allocation PCI newly setting up problem.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of PCI conflict;
Fig. 2 is the schematic diagram that PCI obscures;
Fig. 3 is the flow chart of the distribution method of PCI while initially powering on of the present invention;
The flow chart of the distribution method of PCI when finding conflict when Fig. 4 is normal operation of the present invention or obscuring;
Fig. 5 is the Organization Chart of the distributor of PCI of the present invention;
Fig. 6 is the schematic diagram of the community syntople of the embodiment of the present invention.
Embodiment
The efficiency of distributing in order to improve PCI, reduces the complexity of allocation flow and not having the situation of OMC access also can work, in present embodiment, does not re-use OMC, initiates PCI allocation flow while only powering in base station or when finding PCI conflict or obscuring.And can in this base station, according to service conditions Shan Jian community, PCI be come into force.In the distribution method of the PCI of present embodiment, base station stored is also safeguarded Physical Cell Identifier list (PCI_Table).When community is newly activated, or when PCI conflict occurring or obscuring, mutual by message between base station, completes obtaining or again obtaining of PCI_Table, according to the PCI_Table obtaining, distributes or redistributes PCI.
In present embodiment, take base station is the distribution method of the PCI of example explanation present embodiment, and this method also can be applied to the network equipment of other system, as the BSC of the RNC in WCDMA or GSM, or the entity of a standalone feature etc.
Below in conjunction with accompanying drawing, embodiment of the present invention is elaborated.
The distribution of PCI need to be considered the relation of neighboring interval, how limited PCI is assigned to and is far longer than in 504Ge community and does not occur conflict and obscure the problem that PCI allocation strategy needs emphasis to consider.And conflict and obscure, all concentrate on the adjacent area of certain community and the adjacent area of adjacent area thereof.Therefore,, as long as there is not identical sign in the adjacent area of the He Ta adjacent area, adjacent area of each ,Gai community, community of assurance, in whole network, just can not there is conflict and obscure.
In present embodiment, need each base station generate and safeguard a PCI list (hereinafter referred is PCI_Table), record the occupied information of PCI of the adjacent area of all Zhan Nei community, all adjacent area and all adjacent areas, the basis of distributing as distributed PCI.The base station PCI_Table initially powering on is for empty, need to from adjacent base station, obtain, and select at random one or more unappropriated PCI as the PCI of Zhan Nei community, simultaneously by the adjacent area of result notice oneself, and by adjacent area, notify the adjacent area of adjacent area that it is updated to the PCI newly using in PCI_Table separately.
Refer to shown in Fig. 3 and Fig. 6, suppose that base station 10 is for newly powering on, other is known base station.In present embodiment, the distribution method of distributed PCI when base station initially powers on, comprising:
Step 300: base station 10, when initially powering on, sends PCI_Table request messages by X2 or S1 message to the base station 6,7 and 9 of all vicinities, and contiguous base station replies to this base station by the PCI_Table of own maintenance; The initial p CI_Table of base station 6 is as shown in table 1;
Table 1
| PCI list | Distribution condition | Cell type | MCC:MNC:eNodeB ID:Cid |
| 0 | Unallocated | ||
| 1 | Distribute | The adjacent area of adjacent area | 460:1:1:1 |
| 2 | Distribute | Abutting subdistrict | 460:1:2:2 |
| 3 | Distribute | Abutting subdistrict | 460:1:3:3 |
| 4 | Distribute | The adjacent area of adjacent area | 460:1:4:4 |
| 5 | Distribute | Abutting subdistrict | 460:1:5:5 |
| 6 | Distribute | Zhan Nei community | 460:1:6:6 |
| 7 | Distribute | Abutting subdistrict | 460:1:7:7 |
| 8 | Distribute | The adjacent area of adjacent area | 460:1:8:8 |
| 9 | Distribute | Abutting subdistrict | 460:1:9:9 |
| 10 | Unallocated | ||
| 503 | Unallocated |
Step 310: base station 10 receives all PCI_Table from base station 6,7 and 9, filter out the occupied information of PCI of the abutting subdistrict of abutting subdistrict and abutting subdistrict, mark is in the PCI_Table of oneself, accordingly for the community of oneself is selected PCI=10 at random, and send out PCI updating message to other abutting subdistrict, receive after this message base station 6,7 and 9, " 10; distribute; abutting subdistrict; 460:1:10:10 " are inserted in a hurdle of PCI=10, and the newly-generated PCI_Table in base station 10 is in Table 2;
Table 2
| PCI list | Distribution condition | Cell type | MCC:MNC:eNodeB ID:Cid |
| 0 | Unallocated | ||
| 1 | Unallocated | ||
| 2 | Distribute | The adjacent area of adjacent area | 460:1:2:2 |
| 3 | Distribute | The adjacent area of adjacent area | 460:1:3:3 |
| 4 | Unallocated | ||
| 5 | Distribute | The adjacent area of adjacent area | 460:1:5:5 |
| 6 | Distribute | Abutting subdistrict | 460:1:6:6 |
| 7 | Distribute | Abutting subdistrict | 460:1:7:7 |
| 8 | Distribute | The adjacent area of adjacent area | 460:1:8:8 |
| 9 | Distribute | Abutting subdistrict | 460:1:9:9 |
| 10 | Unallocated | ||
| 503 | Unallocated |
Therefore notice, for the adjacent area of base station 1 and 4 ，Ta Bushi communities 6,7 and 9, can be thought by base station 10 unallocatedly, so just, for PCI multiplexing provides guarantee, the adjacent area of oneself and the adjacent area of adjacent area are only concerned about in any base station; For the ，Dan Tashi community, adjacent area 6 of base station 2 and 3 ，Ta Bushi communities 9 and 7 adjacent area, therefore still can be recorded to the PCI_Table of base station 10.Obviously, if PCI=2 or 3 is selected in community 10, produced and obscured.
Step 320: because base station 10 now, for newly opening station, does not have business, can pass through immediately Shan Jian community, PCI is come into force.
In another kind of scene, UE (User Equipment, subscriber equipment) has reported the measurement message of its adjacent area in the process of this community of access, can carry the PCI of this adjacent area in message; If the PCI of this community is identical with the PCI of adjacent area, it is PCI conflict; If the PCI of two neighboring intervals of this community is identical, for PCI obscures.When finding conflict when base station is normally moved or obscuring, now need to solve the coordination problem in distributed operation, for a PCI, conflict or obscure, only need to have a side to revise.In present embodiment, when PCI conflict occurring or obscure, both sides are random wait a period of time; Remove to detect afterwards the other side's PCI, if without conflict, illustrate that the other side revises, oneself can not operate again, and conflict solves; If still have conflict, select at random in PCI list the not sign of use, revise and notify simultaneously immediately the other side.
Consult shown in Fig. 4 and Fig. 6, suppose that 10 current PC I=3， communities 3,10 small area, base station and community 10 all receive PCI confusion message.In present embodiment, when finding conflict when base station is normally moved or obscuring, the distributed allocation method flow of PCI is as follows:
Step 400: when community 3 and community 10 finds that PCI is identical, random wait a period of time separately; Now do not do any operation;
Step 410: community 3 detects whether also have conflict again; If also had, revise immediately the PCI=20 of oneself, and the adjacent area 2,6 and 7 of notice oneself; Adjacent area once forwards this message, all adjacent areas 1,5,9 and 10 by 2,6 and 7.This operating process can think to be less than the time of the random wait of community 10, the new PCI that send community 3 is received in community 10, think to obscure and solve, stopping obscuring of oneself processes operation (now community 10 is still in the time delay stand-by period, otherwise before the message of 3 of communities, it has been revised PCI in advance message and has issued 3 of 3 ，Er communities, the community PCI that can upgrade community 10 in PCI_Table);
Step 420: all business of base station waits community 3 all finish or are switched to behind other community, by Shan Jian community, comes into force new PCI.
For conflict, also can do same treatment, flow process is basic identical.
As shown in Figure 5, present embodiment also provides the distributor of a kind of PCI, information interaction module, processing module and memory module, wherein:
Information interaction module, for when initially powering on, from the contiguous network equipment, obtain Physical Cell Identifier list (PCI_Table), in PCI_Table, be marked with the occupied information of PCI of abutting subdistrict of occupied information, abutting subdistrict and the abutting subdistrict of the PCI of community under present networks equipment;
Processing module, for according to the occupied information of the PCI of the PCI_Table mark that obtains, selects unappropriated PCI as the PCI of self community, and generates the PCI_Table of self;
Memory module, the PCI_Table generating for stores processor module.
Information interaction module, also for selecting in processing module after the PCI of unappropriated PCI as self community, by selected PCI, notify abutting subdistrict, and by abutting subdistrict, selected PCI is notified to the abutting subdistrict of abutting subdistrict, the occupied information of PCI is upgraded in the abutting subdistrict of indication abutting subdistrict and abutting subdistrict in PCI_Table separately.
Processing module, specifically for filtering the occupied information of the PCI of the abutting subdistrict that obtains abutting subdistrict and abutting subdistrict the PCI_Table from obtaining, in the PCI_Table of self, carry out mark, and by the occupied information mark of the PCI of self community in the PCI_Table of self.
Whether processing module, also, at running, when finding PCI conflict or obscuring, wait for a random time, and detect PCI conflict or obscure and eliminate, if do not eliminated, the PCI clashing or obscure is revised as to unappropriated PCI.
Information interaction module, also for the PCI clashing or obscure being revised as after unappropriated PCI in processing module, by amended PCI, notify abutting subdistrict, and by abutting subdistrict, amended PCI is notified to the abutting subdistrict of abutting subdistrict, stop PCI conflict or the conflict of the respective cell of obscuring or obscure processing.
The method that the embodiment of the present invention provides is not limited to LTE system, correspondingly, for distributing the device of Physical Cell Identifier can be positioned at base station, also can be applied to the network side entity of other system, as the BSC of the RNC in WCDMA or GSM, or the entity of a standalone feature.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described requirement.
Claims (10)
1. a distribution method for Physical Cell Identifier, is characterized in that, comprising:
The network equipment is when initially powering on, from the contiguous network equipment, obtain Physical Cell Identifier list (PCI_Table), in described PCI_Table, be marked with the occupied information of PCI of abutting subdistrict of occupied information, abutting subdistrict and the abutting subdistrict of the PCI of community under present networks equipment;
The described network equipment is according to the occupied information of the PCI of mark in the PCI_Table obtaining, selects unappropriated PCI as the PCI of self community, and generates the PCI_Table of self.
2. the method for claim 1, is characterized in that, also comprises:
The described network equipment is after the PCI that selects unappropriated PCI as self community, by selected PCI, notify abutting subdistrict, and by abutting subdistrict, selected PCI is notified to the abutting subdistrict of abutting subdistrict, the occupied information of PCI is upgraded in the abutting subdistrict of indication abutting subdistrict and abutting subdistrict in PCI_Table separately.
3. the method for claim 1, is characterized in that, generates the PCI_Table of self, comprising:
The described network equipment filters the occupied information of the PCI of the abutting subdistrict that obtains abutting subdistrict and abutting subdistrict from the PCI_Table obtaining, in the PCI_Table of self, carry out mark, and by the occupied information mark of the PCI of self community in the PCI_Table of self.
4. the method for claim 1, is characterized in that, also comprises:
Whether the described network equipment in running, when finding PCI conflict or obscuring, is waited for a random time, and is detected PCI conflict or obscure and eliminate, if do not eliminated, the PCI clashing or obscure is revised as to unappropriated PCI.
5. method as claimed in claim 4, is characterized in that, also comprises:
The described network equipment is being revised as the PCI clashing or obscure after unappropriated PCI, by amended PCI, notify abutting subdistrict, and by abutting subdistrict, amended PCI is notified to the abutting subdistrict of abutting subdistrict, stop PCI conflict or the conflict of the respective cell of obscuring or obscure processing.
6. a distributor for Physical Cell Identifier, is characterized in that, comprising: information interaction module, processing module and memory module, wherein:
Described information interaction module, for when initially powering on, from the contiguous network equipment, obtain Physical Cell Identifier list (PCI_Table), in described PCI_Table, be marked with the occupied information of PCI of abutting subdistrict of occupied information, abutting subdistrict and the abutting subdistrict of the PCI of community under present networks equipment;
Described processing module, for according to the occupied information of the PCI of the PCI_Table mark that obtains, selects unappropriated PCI as the PCI of self community, and generates the PCI_Table of self;
Described memory module, the PCI_Table generating for storing described processing module.
7. device as claimed in claim 6, is characterized in that:
Described information interaction module, also for selecting in described processing module after the PCI of unappropriated PCI as self community, by selected PCI, notify abutting subdistrict, and by abutting subdistrict, selected PCI is notified to the abutting subdistrict of abutting subdistrict, the occupied information of PCI is upgraded in the abutting subdistrict of indication abutting subdistrict and abutting subdistrict in PCI_Table separately.
8. device as claimed in claim 6, is characterized in that:
Described processing module, specifically for filtering the occupied information of the PCI of the abutting subdistrict that obtains abutting subdistrict and abutting subdistrict the PCI_Table from obtaining, in the PCI_Table of self, carry out mark, and by the occupied information mark of the PCI of self community in the PCI_Table of self.
9. device as claimed in claim 6, is characterized in that:
Whether described processing module, also, at running, when finding PCI conflict or obscuring, wait for a random time, and detect PCI conflict or obscure and eliminate, if do not eliminated, the PCI clashing or obscure is revised as to unappropriated PCI.
10. device as claimed in claim 6, is characterized in that:
Described information interaction module, also for the PCI clashing or obscure being revised as after unappropriated PCI in described processing module, by amended PCI, notify abutting subdistrict, and by abutting subdistrict, amended PCI is notified to the abutting subdistrict of abutting subdistrict, stop PCI conflict or the conflict of the respective cell of obscuring or obscure processing.
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| CN201210233026.1A CN103533549A (en) | 2012-07-06 | 2012-07-06 | Distribution method and device for physical cell identities |
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