CN102958056B - PCI distribution method and device - Google Patents

PCI distribution method and device Download PDF

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Publication number
CN102958056B
CN102958056B CN201110242668.3A CN201110242668A CN102958056B CN 102958056 B CN102958056 B CN 102958056B CN 201110242668 A CN201110242668 A CN 201110242668A CN 102958056 B CN102958056 B CN 102958056B
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pci
cell
allocated
above
set
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CN201110242668.3A
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Chinese (zh)
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CN102958056A (en
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邹广玲
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中兴通讯股份有限公司
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Abstract

The invention discloses a kind of PCI distribution method and device, neighboring BS information and default multiplex distance thresholding of the above method according to PCI to be allocated cell, determine the above-mentioned PCI to be allocated available PCI set of cell, and search the minimum PCI of access times from the above-mentioned PCI to be allocated available PCI set of cell, the PCI found is distributed to above-mentioned PCI to be allocated cell, said apparatus includes cell available PCI determining module and PCI distribute modules.Present invention reduces the reference signal-to-interference between adjacent area, network performance and allocative efficiency are improved.

Description

PCI distribution method and device

Technical field

The present invention relates to the communications field, more particularly to a kind of PCI (Physical Cell ID, Physical Cell Identifier) to distribute Method and device.

Background technology

In LTE (Long Term Evolution, Long Term Evolution) system, PCI has 504 altogether, for distinguishing cell, And specific scrambling of cell etc., it is mainly used in the process of cell searching in a network.If there is identical two neighbor cells PCI, it will cause terminal to cannot distinguish between the two cells, occur conflicting and obscure, and the interference between adjacent area can not be random Change, therefore, it is necessary to ensure that PCI is different between adjacent area and ensures that PCI has certain multiplex distance.

Simultaneously as PCI is included in CRS (Cell Reference Signal, cell reference signals) signal sequence, PCI determines CRS frequency domain mapping positions, and CRS is mainly used in down channel quality detection, channel estimation and cell searching, Channel quality quality directly affects MPS process and service feature, therefore, when carrying out PCI distribution, it is necessary to consider corresponding to PCI CRS frequency offset.

PCI common at present distribution method typically considers following factor or method:

A kind of method of salary distribution is sub-clustering, and base station is carried out sub-clustering according to certain scale, is that unit progress PCI is answered according to cluster With, this method can reduce PCI with the free degree, limit PCI allocation flexibilities and final allocation performance, in addition, for than Under the urban area circumstance of comparatively dense, PCI situation is multiplexed between the close cell of easy appearance distance, influences network performance;It is actual Interference in network is not only from all there may be interference in adjacent area, certain distance, it is therefore desirable to consider to ensure that PCI meets Certain multiplex distance.

It is a kind of distribute Consideration be according to by PCI consider adjacent area between CRS frequency shift (FS)s the relation of mould 6, according to 36.211, in the case of single port, consider that CRS frequency shift (FS)s mould 6 is proper, and in real network, currently used is 2 ends Jaws equipment, in this case, consider that CRS frequency shift (FS)s mould 3 more meets actual networking requirement, the present invention meets 2/4 multiterminal simultaneously Mouth situation.

The content of the invention

It is an object of the present invention to provide a kind of PCI distribution method and device, to optimize the PCI allocative efficiencies of LTE system, Ensure PCI distribution effects, to obtain good CRS signal performances.

The invention provides a kind of PCI distribution method, the above method is:

According to the neighboring BS information of PCI to be allocated cell and default multiplex distance thresholding, determine above-mentioned PCI's to be allocated The available PCI set of cell;

The minimum PCI of access times is searched from the above-mentioned PCI to be allocated available PCI set of cell, by what is found PCI distributes to above-mentioned PCI to be allocated cell.

Preferably, the above method still further comprises following steps:

1 is added to the PCI of the above-mentioned cell for distributing to above-mentioned PCI to be allocated access times and is preserved.

Preferably, the PCI of the adjacent area of cell of the above-mentioned neighboring BS information including above-mentioned PCI to be allocated, and above-mentioned adjacent area The PCI of adjacent area;

The initial value of above-mentioned PCI access times is 0.

Preferably, the above method is further comprising the steps of:

PCI progress mould 3 available to system is grouped in advance, obtains three packet PCI set, and according to default distribution plan Slightly each cell under system is sequentially allocated to corresponding packet PCI set.

Preferably, the neighboring BS information of the above-mentioned cell according to PCI to be allocated and default multiplex distance thresholding, are determined above-mentioned The PCI to be allocated available PCI of cell gathers step and is specially:

Obtain the neighboring BS information of above-mentioned PCI to be allocated cell;

According to above-mentioned neighboring BS information, delete what the adjacent area of above-mentioned PCI to be allocated cell used from the available PCI of system The PCI that the adjacent area of PCI and above-mentioned adjacent area uses;

According to above-mentioned multiplex distance thresholding, the cell in above-mentioned multiplex distance thresholding is deleted from the available PCI of system The PCI used, obtain the above-mentioned PCI to be allocated available PCI set of cell.

Preferably, the neighboring BS information of the above-mentioned cell according to PCI to be allocated and default multiplex distance thresholding, are determined above-mentioned The PCI to be allocated available PCI of cell gathers step and is specially:

According to the azimuth of above-mentioned PCI to be allocated cell, the packet PCI belonging to above-mentioned PCI to be allocated cell is determined Set;

Obtain the neighboring BS information of above-mentioned PCI to be allocated cell;

According to above-mentioned neighboring BS information, the adjacent area that above-mentioned PCI to be allocated cell is deleted from above-mentioned packet PCI set uses PCI and above-mentioned adjacent area the PCI that uses of adjacent area;

According to above-mentioned multiplex distance thresholding, deleted from above-mentioned packet PCI set small in above-mentioned multiplex distance thresholding The PCI that area uses, obtain the above-mentioned PCI to be allocated available PCI set of cell.

Preferably, above-mentioned allocation strategy is:, will be nearest from the direct north of base station on the basis of the direct north of base station First community clockwise is assigned to first packet PCI set, will be adjacent clockwise with above-mentioned first community Second community be assigned to second packet PCI set, by with adjacent the 3rd small differentiation clockwise of above-mentioned second community The 3rd packet PCI set is fitted on, fourth cell adjacent with above-mentioned 3rd cell clockwise direction is assigned to the first point Group PCI set, the like.

Preferably, the minimum PCI steps of access times are searched in the available PCI set of the above-mentioned cell from PCI to be allocated In, if the PCI found has more than 2, the above method also performs following steps:

Whether the value for judging above-mentioned access times is zero;

If so, the PCI for wherein numbering minimum is then distributed to above-mentioned PCI to be allocated cell;

Otherwise, the distance priority of above-mentioned PCI to be allocated cell and the cell using the above-mentioned each PCI found is calculated Level;

The PCI that the maximum cell of the distance priority level of cell with above-mentioned PCI to be allocated uses is distributed into above-mentioned treat point Cell with PCI.

Preferably, above-mentioned distance priority level is calculated by equation below:

Pd=DAB+Z×(A1+A2)

Wherein, above-mentioned Pd represents that the distance of above-mentioned PCI to be allocated cell and the cell using the above-mentioned PCI found is excellent First level;Above-mentioned A represents above-mentioned PCI to be allocated cell;Above-mentioned B represents the cell using the above-mentioned PCI found;Above-mentioned DABTable Show the distance between A and B;Above-mentioned Z represents angular transition into the coefficient of distance;Above-mentioned A1 is represented between A azimuth and A and B Line formed angle angle;Above-mentioned B1 represents the angle for the angle that the line between B azimuth and A and B is formed.

Preferably, it is minimum to search access times in the available PCI set of the above-mentioned cell from PCI to be allocated for the above method PCI steps before, it is further comprising the steps of:

Calculate the distance priority level of other cells in above-mentioned PCI to be allocated cell and system and preserve.

Preferably, the minimum PCI steps of access times are searched in the available PCI set of the above-mentioned cell from PCI to be allocated In, if the PCI found has more than 2, the above method also performs following steps:

Whether the value for judging above-mentioned access times is zero;

If so, the PCI for wherein numbering minimum is then distributed to above-mentioned PCI to be allocated cell;

Otherwise, the distance priority of above-mentioned PCI to be allocated cell and the cell using the above-mentioned each PCI found is read Level;

The PCI that the maximum cell of the distance priority level of cell with above-mentioned PCI to be allocated uses is distributed into above-mentioned treat point Cell with PCI.

Invention further provides a kind of PCI distributors, including cell available PCI determining module and PCI distribution Module,

Above-mentioned cell available PCI determining module, neighboring BS information and default multiplexing for the cell according to PCI to be allocated Distance threshold, determine the above-mentioned PCI to be allocated available PCI set of cell;

Above-mentioned PCI distribute modules, for searching access times in the available PCI set of cell from above-mentioned PCI to be allocated Minimum PCI, the PCI found is distributed to above-mentioned PCI to be allocated cell.

Preferably, said apparatus also includes initialization module, is grouped for carrying out mould 3 to the available PCI of system, obtains three Individual packet PCI set, and each cell under system is sequentially allocated to corresponding packet PCI collection according to default allocation strategy Close.

Preferably,

Above-mentioned cell available PCI determining module, for determining the packet PCI set belonging to above-mentioned PCI to be allocated cell; The neighboring BS information of above-mentioned PCI to be allocated cell is obtained, and in the available PCI of deletion system or in respective packets PCI set The PCI used by the adjacent area of above-mentioned PCI to be allocated cell and the PCI, Yi Ji that are used by the adjacent area of above-mentioned adjacent area The PCI that cell in default multiplex distance thresholding uses, obtain the above-mentioned PCI to be allocated available PCI set of cell;

Above-mentioned PCI distribute modules, the distance priority of other cells in the cell and system for calculating above-mentioned PCI to be allocated Level simultaneously preserves;When the PCI found has more than 2, whether the value for judging above-mentioned PCI access times is zero, and above-mentioned When the value of access times is 0, the PCI for wherein numbering minimum is distributed to above-mentioned PCI to be allocated cell;In above-mentioned access times When value is not 0, the PCI that the maximum cell of the distance priority level of the cell with above-mentioned PCI to be allocated uses is distributed into above-mentioned treat Distribute PCI cell;And the PCI of the cell to distributing to above-mentioned PCI to be allocated access times add 1 and preserved.

The present invention considers adjacent area factor and multiplex distance maximization when distributing PCI, and considers CRS frequencies Skew, reduces the reference signal-to-interference between adjacent area, improves network performance and allocative efficiency, suitable for large-scale network PCI is distributed.

Brief description of the drawings

Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the present invention, this hair Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is the flow chart of PCI distribution method first preferred embodiment of the present invention;

Fig. 2 is the flow chart of the preferred embodiment of PCI distribution method second of the present invention;

Fig. 3 is the theory diagram of PCI distributors preferred embodiment of the present invention.

Embodiment

In order that technical problems, technical solutions and advantages to be solved are clearer, clear, tie below Drawings and examples are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used To explain the present invention, it is not intended to limit the present invention.

As shown in figure 1, being the flow chart of PCI distribution method first preferred embodiment of the present invention, the present embodiment includes following Step:

Step S101:The available PCI of system is determined, obtains PCI set M;

A total of 504 PCI in LTE system, it is assumed that the available PCI of system is 0 to 400, and remaining is reserved, and reserved part is used In newly-increased website and multi-vendor juncture area;

Step S102:Obtain the neighboring BS information of PCI to be allocated cell;

The PCI of the adjacent area of cell of the above-mentioned neighboring BS information including above-mentioned PCI to be allocated, and the adjacent area of above-mentioned adjacent area PCI;If the PCI of some cell is sky in neighboring BS information, it is PCI to be allocated cell;It is if all small in neighboring BS information Area is PCI to be allocated cell, then the neighboring BS information that this step is got is sky.

Step S103:According to above-mentioned neighboring BS information, the neighbour that above-mentioned PCI to be allocated cell is deleted from above-mentioned PCI set M The PCI that area the uses and PCI that the adjacent area of above-mentioned adjacent area uses;

Step S104:According to default multiplex distance thresholding, then deleted from above-mentioned PCI set M in above-mentioned multiplex distance The PCI that cell in thresholding uses, obtain the above-mentioned PCI to be allocated available PCI set H of cell;

Step S105:Search the PCI that access times N is minimum in the above-mentioned PCI to be allocated available PCI set H of cell;

Step S106:Judge number C and 1 size found, if equal to 1, perform step S107;If more than 1, Perform step S108;

Step S107:By the above-mentioned cell for finding PCI and distributing to above-mentioned PCI to be allocated, step S112 is performed;

Step S108:Judge whether above-mentioned access times N is 0, if so, then performing step S109;Otherwise, step is performed S110;

Step S109:The PCI that minimum is numbered in the above-mentioned PCI found is distributed to above-mentioned PCI to be allocated cell, held Row step S112;

Step S110:The distance for calculating above-mentioned PCI to be allocated cell and each cell using the above-mentioned PCI found is excellent First level Pd;

This step calculates distance priority level Pd by equation below:

Pd=DAB+Z×(A1+A2)

Wherein, above-mentioned Pd represents that the distance of above-mentioned PCI to be allocated cell and the cell using the above-mentioned PCI found is excellent First level;Above-mentioned A represents above-mentioned PCI to be allocated cell;Above-mentioned B represents the cell using the above-mentioned PCI found;Above-mentioned DABTable Show the distance between A and B;Above-mentioned Z represents that angular transition is a constant into the coefficient of distance;Above-mentioned A1 represent A azimuth with The angle for the angle that line between A and B is formed;Above-mentioned B1 represents the angle that the line between B azimuth and A and B is formed Angle.

Such as, it is assumed that PCI to be allocated cell is A, and step S105 finds 3 access times N identical PCI, is used This 3 PCI cell is respectively B1, B2, B3, then this step needs to calculate A and B1, B2, B3 distance priority level respectively, i.e., this Step can obtain 3 values.

Step S111:The PCI that the maximum cells of the distance priority level Pd of cell with PCI to be allocated use is distributed to State PCI to be allocated cell;

Step S112:1 is added to the PCI of the above-mentioned cell for distributing to above-mentioned PCI to be allocated access times N and is preserved.

PCI access times N initial value is that 0, PCI is often allocated once, and its access times N just adds 1, using as follow-up Distribute PCI foundation.

As shown in Fig. 2 being the flow chart of the preferred embodiment of PCI distribution method second of the present invention, the present embodiment includes following Step:

Step S201:The available PCI of system is determined, obtains PCI set M;

A total of 504 PCI in LTE system, it is assumed that the available PCI of system is 0 to 400, and remaining is reserved, and reserved part is used In newly-increased website and multi-vendor juncture area;

Step S202:Mould 3 is carried out to above-mentioned PCI set H to be grouped, and is obtained three packet PCI set, is designated as first point respectively Group PCI set M0, the packet PCI set of second packet PCI set M1 and the 3rd M2;

This step is that the PCI of No. 0-400 of LTE system is grouped, and is grouped according to mould 3 for 0,1,2, then M0 Include Isosorbide-5-Nitrae including 0,3,6,9..., M1,7,10..., M2 includes 2,5,8,11....

Step S203:Each cell under system is sequentially allocated to corresponding packet PCI collection according to default allocation strategy Close;

Cell is assigned to corresponding packet PCI set by this step so which packet PCI set is cell belong to, then exists When the cell needs to distribute PCI, just PCI is selected from the packet PCI set belonging to it for it.

In the present embodiment, above-mentioned allocation strategy is:On the basis of the direct north of base station, by from the direct north of base station most Near first community clockwise is assigned to first packet PCI set, will be with above-mentioned first community clockwise Adjacent second community is assigned to second packet PCI set, and threeth adjacent with above-mentioned second community clockwise direction is small Differentiation is fitted on the 3rd packet PCI set, and fourth cell adjacent with above-mentioned 3rd cell clockwise direction is assigned into first Individual packet PCI set, the like, it is assigned until by all cells under base station, above-mentioned first packet PCI set can Think any one in 3 packet PCI set, you can be any one in M0, M1, M2, second is grouped PCI set For any one in remaining 2 packets PCI set, the 3rd packet PCI collection is combined into last remaining packet PCI set, should Allocation strategy ensure that PCI moulds 3 between adjacent area first, so that the CRS frequency shift (FS)s of different districts are different, secondly protect PCI is not multiplexed between having demonstrate,proved adjacent area.

Step S204:According to the azimuth of above-mentioned PCI to be allocated cell, belonging to the cell for determining above-mentioned PCI to be allocated Packet PCI set;

The present embodiment is compared with first preferred embodiment so that subsequent step needs PCI to be processed number to reduce greatly About 2/3rds.

Step S205:Calculate the distance priority level of remaining each cell in above-mentioned PCI to be allocated cell and system and preserve;

Identical with the step S110 of above-mentioned first preferred embodiment, this step calculates distance priority again by equation below Level Pd:

Pd=DAB+Z×(A1+A2)

Wherein, the distance of some cell in the above-mentioned PCI to be allocated of above-mentioned Pd expressions cell and system in remaining cell Priority;Above-mentioned A represents above-mentioned PCI to be allocated cell;Some cell in above-mentioned B expressions system in remaining cell;It is above-mentioned DABRepresent the distance between A and B;Above-mentioned Z represents that angular transition is a constant into the coefficient of distance;Above-mentioned A1 represents A orientation The angle for the angle that line between angle and A and B is formed;Above-mentioned B1 represents what the line between B azimuth and A and B was formed The angle of angle.

Such as, it is assumed that a total of 3 cells, respectively X, Y, Z in system, PCI to be allocated cell is X, then this step Need to calculate X and Y, X and Z distance priority level respectively, i.e. this step can obtain 2 values.

Such a calculation has considered distance and bearing relation between cell, maximizes and considers PCI multiplexings.

Step S206:Obtain the neighboring BS information of above-mentioned PCI to be allocated cell;

The PCI of the adjacent area of cell of the above-mentioned neighboring BS information including above-mentioned PCI to be allocated, and the adjacent area of above-mentioned adjacent area PCI;If the adjacent area of above-mentioned PCI to be allocated cell or the cell that the adjacent area of above-mentioned adjacent area is PCI to be allocated, its PCI are It is empty.

Step S207:According to above-mentioned neighboring BS information, above-mentioned PCI to be allocated cell is deleted from above-mentioned packet PCI set The PCI that uses of adjacent area and above-mentioned adjacent area the PCI that uses of adjacent area;

Step S208:According to above-mentioned multiplex distance thresholding, then deleted from above-mentioned packet PCI set in above-mentioned multiplex distance The PCI that cell in thresholding uses, obtain the above-mentioned PCI to be allocated available PCI set M of cell;

Step S209:Search the PCI that access times N is minimum in the above-mentioned PCI to be allocated available PCI set M of cell;

For example the above-mentioned PCI to be allocated available PCI set M of cell shares 5 PCI, if its access times N is respectively: 5th, 4,2,1,1, then this step find two eligible PCI;If its access times N is 0, this step finds five Eligible PCI;If its access times N is 2,2,3,3,1, this step finds an eligible PCI.

Step S210:Judge number C and 1 size found, if equal to 1, perform step S211;If more than 1, Perform step S212;

Step S211:Using the PCI minimum above-mentioned access times N found as above-mentioned PCI to be allocated cell PCI, i.e., the minimum PCI of the above-mentioned access times N found are distributed to above-mentioned PCI to be allocated cell;

Step S212:Judge whether above-mentioned access times N is 0, if so, then performing step S213;Otherwise, step is performed S214;

Step S213:The PCI for selecting to number minimum in the above-mentioned PCI found is as above-mentioned PCI to be allocated cell PCI, i.e., the PCI that minimum is numbered in the above-mentioned PCI found is distributed to above-mentioned PCI to be allocated cell;

Step S214:The distance for reading above-mentioned PCI to be allocated cell and each cell using the above-mentioned PCI found is excellent First level Pd;

In cell and system of the present embodiment due to having precalculated and having saved PCI to be allocated between remaining cell away from From priority P d, as long as therefore this step reading.

Step S215:The PCI conducts that the selection cell maximum with the distance priority level of above-mentioned PCI to be allocated cell uses The PCI of above-mentioned PCI to be allocated cell, the PCI that will be used with the cell of the distance priority level maximum of PCI to be allocated cell Distribute to above-mentioned PCI to be allocated cell;

The present invention had both considered PCI access times, maximized multiplex distance again, not only reduces PCI conflicts and mixes Confuse probability, and improves network performance.

Step S216:1 is added to the PCI of the above-mentioned cell for distributing to above-mentioned PCI to be allocated access times N and is preserved.

PCI access times N initial value is that 0, PCI is often allocated once, and its access times N just adds 1, using as follow-up Distribute PCI foundation.

As shown in figure 3, be the theory diagram of PCI distributors preferred embodiment of the present invention, in this implementation, PCI distribution dresses Put including initialization module 01, cell available PCI determining module 02 and PCI distribute modules 03,

Initialization module 01, it is grouped for carrying out mould 3 to the available PCI of system, obtains three packet PCI set, and press Each cell under system is sequentially allocated to corresponding packet PCI set according to default allocation strategy;

Cell available PCI determining module 02, for the azimuth of the cell according to PCI to be allocated, determine above-mentioned to be allocated Packet PCI set belonging to PCI cell;The neighboring BS information of above-mentioned PCI to be allocated cell is obtained, and is believed according to above-mentioned adjacent area Breath and default multiplex distance thresholding, treated point by above-mentioned in the available PCI of deletion system or in corresponding packet PCI set PCI that the adjacent area of cell with PCI the uses and PCI used by the adjacent area of above-mentioned adjacent area, and default multiplexing away from The PCI used from the cell in thresholding, obtain the above-mentioned PCI to be allocated available PCI set M of cell;

PCI distribute modules 03, the distance priority level of other cells in the cell and system for calculating above-mentioned PCI to be allocated Pd is simultaneously preserved;And the minimum PCI of access times N are searched from the above-mentioned PCI to be allocated available PCI set M of cell, and When the PCI number C found is 1, the PCI found is distributed to above-mentioned PCI to be allocated cell, in the PCI found Number C be more than 2 when, whether the value for judging above-mentioned PCI access times N is zero, and is in above-mentioned access times N value When 0, the PCI for wherein numbering minimum is distributed to above-mentioned PCI to be allocated cell;, will when above-mentioned access times N value is not 0 The PCI that maximum cell uses with the distance priority level Pd of above-mentioned PCI to be allocated cell distributes to the small of above-mentioned PCI to be allocated Area;And the PCI of the cell to distributing to above-mentioned PCI to be allocated access times N adds 1 and preserved.

The preferred embodiments of the present invention have shown and described in described above, but as previously described, it should be understood that the present invention is not Form disclosed herein is confined to, is not to be taken as the exclusion to other embodiment, and available for various other combinations, modification And environment, and can be carried out in the scope of the invention is set forth herein by the technology or knowledge of above-mentioned teaching or association area Change., then all should be in institute of the present invention and the change and change that those skilled in the art are carried out do not depart from the spirit and scope of the present invention In attached scope of the claims.

Claims (12)

  1. A kind of 1. Physical Cell Identifier PCI distribution method, it is characterised in that
    According to the neighboring BS information of PCI to be allocated cell and default multiplex distance thresholding, the cell of the PCI to be allocated is determined Available PCI set;
    The minimum PCI of access times is searched from the available PCI set of cell of the PCI to be allocated, by the PCI found points PCI to be allocated cell described in dispensing;
    The minimum PCI of access times is searched in the available PCI set of the cell from PCI to be allocated, by the PCI found points PCI to be allocated cell includes described in dispensing:
    If the PCI found has more than 2, whether the value for judging the access times is zero;
    If so, the PCI for wherein numbering minimum is then distributed to the cell of the PCI to be allocated;
    Otherwise, calculate the PCI to be allocated cell and use described in the distance priority level of each PCI cell that finds;
    The PCI that the maximum cell of the distance priority level of cell with the PCI to be allocated uses is distributed into the PCI to be allocated Cell.
  2. 2. according to the method for claim 1, it is characterised in that methods described still further comprises following steps:
    1 is added to the PCI of the cell for distributing to the PCI to be allocated access times and is preserved.
  3. 3. method according to claim 1 or 2, it is characterised in that
    The neighboring BS information includes the PCI of the adjacent area of the cell of the PCI to be allocated, and the PCI of the adjacent area of the adjacent area;
    The initial value of the access times of the PCI is 0.
  4. 4. method according to claim 1 or 2, it is characterised in that methods described is further comprising the steps of:
    PCI progress mould 3 available to system is grouped in advance, obtains three packet PCI set, and will according to default allocation strategy Each cell under system is sequentially allocated to corresponding packet PCI set.
  5. 5. according to the method for claim 3, it is characterised in that the neighboring BS information of the cell according to PCI to be allocated and Default multiplex distance thresholding, the available PCI set step of cell for determining the PCI to be allocated are specially:
    Obtain the neighboring BS information of the cell of the PCI to be allocated;
    According to the neighboring BS information, the PCI that the adjacent area of the cell of the PCI to be allocated uses is deleted from the available PCI of system And the PCI that the adjacent area of the adjacent area uses;
    According to the multiplex distance thresholding, the cell deleted from the available PCI of system in the multiplex distance thresholding uses PCI, obtain the cell available PCI set of the PCI to be allocated.
  6. 6. according to the method for claim 4, it is characterised in that the neighboring BS information of the cell according to PCI to be allocated and Default multiplex distance thresholding, the available PCI set step of cell for determining the PCI to be allocated are specially:
    According to the azimuth of the cell of the PCI to be allocated, the packet PCI set belonging to the cell of the PCI to be allocated is determined;
    Obtain the neighboring BS information of the cell of the PCI to be allocated;
    According to the neighboring BS information, what the adjacent area of the cell for deleting the PCI to be allocated from packet PCI set used The PCI that the adjacent area of PCI and the adjacent area uses;
    According to the multiplex distance thresholding, cell of the deletion in the multiplex distance thresholding makes from packet PCI set PCI, obtain the available PCI set of cell of the PCI to be allocated.
  7. 7. according to the method for claim 4, it is characterised in that the allocation strategy is:Using the direct north of base station as base Standard, the first community clockwise nearest from the direct north of base station is assigned to first packet PCI set, will be with The adjacent second community of the first community clockwise direction is assigned to second packet PCI set, will be with the second community The 3rd adjacent cell is assigned to the 3rd packet PCI set clockwise, will be with the 3rd cell clockwise direction phase The 4th adjacent cell is assigned to first packet PCI set, the like.
  8. 8. according to the method for claim 1, it is characterised in that the distance priority level is calculated by equation below:
    Pd=DAB+Z×(A1+A2)
    Wherein, the Pd represent the PCI to be allocated cell and use described in the distance priority of PCI cell that finds Level;The A represents the cell of the PCI to be allocated;The B represents the PCI found described in use cell;The DABRepresent The distance between A and B;The Z represents angular transition into the coefficient of distance;The A1 is represented between A azimuth and A and B The angle for the angle that line is formed;The A2 represents the angle for the angle that the line between B azimuth and A and B is formed.
  9. 9. method according to claim 1 or 2, it is characterised in that methods described can in the cell from PCI to be allocated It is further comprising the steps of before the minimum PCI steps of access times are searched in PCI set:
    Calculate the distance priority level of other cells in the cell and system of the PCI to be allocated and preserve.
  10. A kind of 10. PCI distributors, it is characterised in that including cell available PCI determining module and PCI distribute modules,
    The cell available PCI determining module, neighboring BS information and default multiplex distance for the cell according to PCI to be allocated Thresholding, determine the available PCI set of cell of the PCI to be allocated;
    The PCI distribute modules, it is minimum for searching access times in the available PCI set of cell from the PCI to be allocated PCI, the PCI found is distributed to the cell of the PCI to be allocated;
    Wherein, the PCI distribute modules, for searching access times in the available PCI set of cell from the PCI to be allocated Minimum PCI, the cell that the PCI found is distributed to the PCI to be allocated specifically include:
    When the PCI found has more than 2, whether the value for judging the access times of the PCI is zero, and described using secondary When several values is 0, the PCI for wherein numbering minimum is distributed to the cell of the PCI to be allocated;
    When the value of the access times is not 0, the maximum cell of the distance priority level of the cell with the PCI to be allocated is made PCI distributes to the cell of the PCI to be allocated;And the PCI of the cell to distributing to the PCI to be allocated use time Number adds 1 and preserved.
  11. 11. device according to claim 10, it is characterised in that described device also includes initialization module, for being The available PCI that unites carries out mould 3 and is grouped, and obtains three packet PCI set, and will be each small under system according to default allocation strategy Area is sequentially allocated to corresponding packet PCI set.
  12. 12. the device according to claim 10 or 11, it is characterised in that
    The cell available PCI determining module, for determining the packet PCI set belonging to the cell of the PCI to be allocated;Obtain The neighboring BS information of the cell of the PCI to be allocated, and in the available PCI of deletion system or respective packets PCI set in by PCI that the adjacent area of the cell of the PCI to be allocated the uses and PCI used by the adjacent area of the adjacent area, and default Multiplex distance thresholding in the PCI that uses of cell, obtain the available PCI set of cell of the PCI to be allocated;
    The PCI distribute modules, the distance priority level of other cells is simultaneously in the cell and system for calculating the PCI to be allocated Preserve.
CN201110242668.3A 2011-08-23 2011-08-23 PCI distribution method and device CN102958056B (en)

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