CN101778395A - Method and device for planning physical cell identities - Google Patents
Method and device for planning physical cell identities Download PDFInfo
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Abstract
The embodiment of the invention discloses a method and a device for planning physical cell identities (PCI), so as to avoid the PCI collision and reduce the interference of reference signals. The method of the embodiment of the invention comprises the following steps: acquiring the interference information among base stations; assigning different Vshift groups according to the interference information, i.e., assigning the corresponding Vshift to the cell in each base station; clustering the base stations according to the relation of physical positions of the base stations; assigning the PCI group to the base station in the non-multiplexing cluster and assigning the PCI to the cell in the base station; calculating the score of each PCI group, assigning the PCI group with the score thereof meeting the preset conditions to the base station in the multiplexing cluster, and assigning the PCI to the cell in the base station. The embodiment of the invention further provides a device for planning the PCI. The embodiment of the invention can effectively avoid the PCI collision and reduce the interference of the reference signals.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of Physical Cell Identifier planing method and device.
Background technology
Long Term Evolution (LTE, Long Term Evolution) the Cell searching flow process of network has been determined employing cell ID (ID, Identity) grouping, at first determine sub-district ID group by auxiliary synchronization channel, determine concrete sub-district ID by primary synchronization channel again, be Physical Cell Identifier (PCI, Physical CellID).
On the ability of supporting many cell networkings, the quantity of PCI is The more the better, but many more PCI then require the high performance auxiliary synchronization channel sequence of sufficient amount to support PCI search fast and accurately, may raise the cost greatly.Therefore among the LTE, each PCI group comprises 3 PCI, and PCI quantity should be able to be divided exactly by 3, should be 6 multiple in conjunction with descending scrambler quantity, determines that finally the PCI quantity of LTE is 504.
Because the PCI limited amount, inevitably to carry out multiplexingly in the realistic set network process to these PCI, then may produce certain conflict, for reduce this conflict as far as possible, then require the multiplex distance of identical PCI can not be too small.
A kind of PCI distribution method of the prior art is roughly:
Identical PCI can not be distributed in two adjacent sub-districts, if used identical PCI, can cause in this case in the overlapping region at the most that a sub-district can be detected by subscriber equipment (UE, User Equipment), and this situation is called " conflict ";
Another scene is that two neighbor cells of a sub-district have identical PCI, if the UE request switches to the sub-district that ID is A in this case, the base station does not know which is a Target cell, and this situation is called " confusion ".
Both of these case all is called the PCI conflict, will guarantee that in minute timing PCI is unique in the overlay area of any one sub-district, and can not there be identical PCI two adjacent adjacent areas of a sub-district.
That is to say that in the scheme of prior art, it distributes the criterion of PCI to be " avoiding occurring the PCI conflict ", can effectively avoid the situation of " conflict " and " confusion " to occur like this.
But, in above-mentioned prior art, only considered and avoided occurring the PCI conflict, and stipulate according to agreement, the frequency displacement of the reference signal of different antennae configuration also needs to determine according to PCI, and in the prior art and reckon without this point, therefore can cause overlapped and the interference between the reference signal that causes of pilot signal.
Summary of the invention
The embodiment of the invention provides a kind of Physical Cell Identifier planing method and device, can avoid the PCI conflict, and reduces the interference between reference signal.
The Physical Cell Identifier planing method that the embodiment of the invention provides comprises: obtain the interfere information between each base station; According to described interfere information is the different Vshift of each base station assigns group, and be the Vshift of correspondence during the Vshift of this base station of cell allocation each base station in organizes; According to the relation of the physical location between each base station sub-clustering is carried out in each base station and obtain non-multiplexing cluster and multiplexing cluster; For the base station in the non-multiplexing cluster, the Vshift that distributes according to the sub-district in this base station is this base station assigns PCI group and is the cell allocation PCI in this base station; For the base station in the multiplexing cluster, calculate each PCI group score, the PCI set of dispense of selecting PCI group score to satisfy prerequisite is given this base station, and is the cell allocation PCI in this base station according to the Vshift that the sub-district in this base station is distributed.
The Physical Cell Identifier device for planning that the embodiment of the invention provides comprises: acquiring unit is used to obtain the interfere information between each base station; First allocation units are used for being the different Vshift of each base station assigns group according to described interfere information, and be the Vshift of correspondence during the Vshift of this base station of cell allocation each base station in organizes; The sub-clustering unit is used for according to the relation of the physical location between each base station sub-clustering being carried out in each base station and obtains non-multiplexing cluster and multiplexing cluster; Second allocation units are used for for the base station in the non-multiplexing cluster, and the Vshift that distributes according to the sub-district in this base station is this base station assigns PCI group and is the cell allocation PCI in this base station; For the base station in the multiplexing cluster, calculate each PCI group score, the PCI set of dispense of selecting PCI group score to satisfy prerequisite is given this base station, and is the cell allocation PCI in this base station according to the Vshift that the sub-district in this base station is distributed.
As can be seen from the above technical solutions, the embodiment of the invention has the following advantages:
In the embodiment of the invention, the Physical Cell Identifier device for planning can obtain the interfere information between each base station, and be the different Vshift of each base station assigns group according to interfere information, and be corresponding Vshift in the Vshift group of this base station of cell allocation in each base station, utilize Vshift group and Vshift to determine the PCI of the sub-district of each base station again, therefore can make the PCI of final distribution can reduce overlapped and the interference between the reference signal that causes of pilot signal;
Secondly, in the embodiment of the invention, can also carry out sub-clustering to each base station according to the relation of the physical location between each base station, and to multiplexing cluster and the different PCI allocation rule of non-multiplexing cluster employing, therefore can improve the isolation that PCI distributes, improve simultaneously and distribute and multiplexing efficient, and then avoid the PCI conflict.
Description of drawings
Fig. 1 is embodiment schematic diagram of Physical Cell Identifier planing method in the embodiment of the invention;
Fig. 2 is another embodiment schematic diagram of Physical Cell Identifier planing method in the embodiment of the invention;
Fig. 3 is the embodiment of the invention frequency domain reference signal schematic diagram in the pattern that staggers;
Fig. 4 is the reference signal schematic diagram in the pattern that staggers of time domain in the embodiment of the invention;
Fig. 5 is the adjacent base station of zero a layer schematic diagram in the embodiment of the invention;
Fig. 6 is a sub-clustering schematic diagram in the embodiment of the invention;
Fig. 7 is that the number of plies is calculated schematic diagram in the embodiment of the invention;
Fig. 8 is a Physical Cell Identifier device for planning embodiment schematic diagram in the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of Physical Cell Identifier planing method and device, can avoid the PCI conflict, and reduces the interference between reference signal.
See also Fig. 1, the Physical Cell Identifier planing method in the embodiment of the invention comprises:
101, obtain interfere information between each base station;
In the present embodiment,, at first calculate interfere information mutual between each base station for the base station of needs planning PCI.
102, be the different Vshift of each base station assigns group according to interfere information, and be the Vshift of correspondence during the Vshift of this base station of cell allocation each base station in organizes;
Getting access to after the interfere information between each base station, can be the different Vshift of each base station assigns group according to these interfere informations, and be the Vshift of correspondence during the Vshift of this base station of cell allocation each base station in organizes.
Need to prove, according to agreement 36211-870,6.10 the joint descriptions as can be known, the reference signal frequency displacement also can be obtained by PCI, as shown in the formula:
It is the mould that Vshift equals PCI and 6.
103, according to the relation of the physical location between each base station sub-clustering is carried out in each base station and obtain non-multiplexing cluster and multiplexing cluster;
Each base station has the physical location of self, then can carry out sub-clustering to each base station according to the relation of the physical location between each base station and obtain non-multiplexing cluster and multiplexing cluster.
The number of PCI is limited, is 504, non-multiplexing cluster be meant not the place, base station of using the PCI that repeats bunch, corresponding, PCI then can be reused in the base station in the multiplexing cluster.
104, for the base station in the non-multiplexing cluster, the Vshift that distributes according to the sub-district in this base station is this base station assigns PCI group and is the cell allocation PCI in this base station;
After sub-clustering is finished, can and be cell allocation PCI in the base station to the base station assigns PCI in non-multiplexing cluster group, the foundation of distribution can be the Vshift that in step 102, is assigned to before this base station organize and this base station in the Vshift that arrives of cell allocation.
105, for the base station in the multiplexing cluster, calculate each PCI group score, the PCI set of dispense of selecting PCI group score to satisfy prerequisite is given this base station, and is the cell allocation PCI in this base station according to the Vshift that the sub-district in this base station is distributed.
After sub-clustering is finished, can and be cell allocation PCI in the base station to the base station assigns PCI in multiplexing cluster group, the foundation of distribution can be that each PCI organizes the score with respect to a certain base station, and the Vshift that distributes of the sub-district in this base station of step 102.
Need to prove that in the present embodiment, the priority execution sequence that step 104 and 105 is unfixing can carry out 104 earlier, also can carry out 105 earlier, perhaps can also carry out 104 and 105 simultaneously, concrete implementation is not done qualification herein.
In the present embodiment, the Physical Cell Identifier device for planning can obtain the interfere information between each base station, and be the different Vshift of each base station assigns group according to interfere information, and be corresponding Vshift in the Vshift group of this base station of cell allocation in each base station, utilize Vshift group and Vshift to determine the PCI of the sub-district of each base station again, therefore can make the PCI of final distribution can reduce overlapped and the interference between the reference signal that causes of pilot signal;
Secondly, in the present embodiment, can also carry out sub-clustering to each base station according to the relation of the physical location between each base station, and to multiplexing cluster and the different PCI allocation rule of non-multiplexing cluster employing, therefore can improve the isolation that PCI distributes, improve simultaneously and distribute and multiplexing efficient, and then avoid the PCI conflict.
For ease of understanding, with an instantiation Physical Cell Identifier planing method in the embodiment of the invention is described below, see also Fig. 2, another embodiment of Physical Cell Identifier planing method comprises in the embodiment of the invention:
201, obtain interfere information between each base station;
In the present embodiment,, at first calculate interfere information mutual between each base station for the base station of needs planning PCI.
Need to prove, according to agreement 36211-870,6.11 joints, the PCI of LTE is by Primary Synchronisation Code (N
ID (2)) and secondary synchronization code (N
ID (1)) form, suc as formula 1,
N wherein
ID (1)Value is 0～167, N
ID (2)Value is 0～2.
202, distribute Vshift group for initial base station, and be the Vshift during cell allocation the one Vshift first base station in organizes;
In the present embodiment, for ease of understanding, at first Vshift group and Vshift are carried out brief description: in order to reduce the interference between the reference signal, can stagger to Vshift, the concrete mode that staggers comprises that frequency domain staggers and time domain staggers.
Suppose to adopt 2 antennas, the scheme that frequency domain staggers sees also Fig. 3, and wherein, the reference signal mode of sub-district has 3 kinds.
The scheme that time domain staggers sees also Fig. 4, wherein, is adopting under the same antenna configurations, and the preference pattern that adopts time domain to stagger has been Duoed 3 times than the preference pattern that only adopts frequency domain to stagger.The Vshift that is each sub-district can have more selection, so the interference of the scheme that staggers of time domain between can more effective elimination reference signal.
In present embodiment and follow-up embodiment, all the scheme that staggers with time domain is that example describes.
In this step, at first can determine initial base station, concrete definite process is: determine the number of the adjacent base station of zero layer of each base station, the base stations that the adjacent number of base stations of zero layer is maximum are as initial base station.
Definite process of the number of the concrete adjacent base station of zero layer can be consulted Fig. 5, wherein A is first base station, B is second base station, according to the division rule that presets A and B are divided and to obtain coverage, promptly the line with base station A, B is that diameter is drawn circle, DG is the straight line that is parallel to diameter AB, OD=1/3AB wherein, equally, EF is parallel to AB, and OE=1/3AB wherein is as the part that constitutes in EF place line segment among Fig. 5 and the DG place line segment, if in the coverage of this part, there are not other base stations, base station A and the base station B adjacent base station of zero layer each other is set then.
Need to prove that above-mentioned division rule only is an example in the present embodiment, in actual applications, the ratio between OD and the AB, and the ratio between OE and the AB is not limited to 1/3, can also be other ratio, concrete ratio does not limit herein.
Calculate the number of the adjacent base station of zero layer of each base station according to said method, the base station that the number of the adjacent base station of selection zero layer is maximum is as initial base station then, need to prove, to the maximum base station priority allocation in the zero adjacent base station of layer is because there is the adjacent interference relation in this base station with other a lot of base stations, therefore often be in the hot spot region, need the preferential PCI accuracy that guarantees these positions.
Determined after the initial base station, promptly can be this initial base station and distribute Vshift group, and be Vshift in cell allocation the one Vshift group in this initial base station, need to prove, the concrete method of salary distribution can be with reference to the PCI time domain Vshift allocation table that staggers, specifically can be as shown in the table:
Table 1
V1 V2 V3 V4 V5 V6
VI、VII、VI、VII、VI、VII、VI、VII、VI、VII、VIII?VI、VII、
VIII VIII VIII VIII VIII
0 group 0,6,121,7,132,8,143,9,154,10,165,11,17
…… …… …… …… …… …… ……
10 group 180,186,181,187,182,188,183,189,184,190,196 185,191,
192 193 194 195 197
11 group 198,204,199,205,200,206,201,207,202,208,214 203,209,
210 211 212 213 215
…… …… …… …… …… …… ……
27 group 486,492,487,493,488,494,489,495,490,496,502 491,497,
498 499 500 501 503
By 504 PCI of LTE according to agreement formula v
Shift=N
ID CellMod6 can obtain 6 frequency displacements, again because product adopts time domain to stagger makes the sub-district send frequency domain position simultaneously can to interlock, lower the interference between reference signal, so the Primary Synchronisation Code of the PCI of each base station assigns is identical, 504 PCI can be divided into the V1 shown in the above-mentioned table 1 thus, V2, V3, V4, V5, these 6 Vshift groups of V6, respectively corresponding 6 Vshft frequency displacements.
In the present embodiment, the Vshift for a Vshift group of initial base station distribution and each sub-district promptly distributes the V1 group, distributes VI, VII, VIII in turn according to azimuth, the sub-district size of initial base station afterwards.203, determine base station to be allocated according to the interfere information between initial base station and other base stations; For initial base station distributed the Vshift group and for the cell allocation of initial base station after the Vshift, can be according to distributing the interfere information between base station and the unallocated base station to determine base station to be allocated, detailed process can each have distributed interference sum between the base station in order to calculate unallocated base station and other, with the unallocated base station of disturbing the sum maximum as base station to be allocated, for example:
A and B are unappropriated base stations, C, D, E is the website that has distributed, Distribution Calculation A and C, A and D, interference value between A and the E, again these three interference value additions are the interference value that unallocated website A is subjected to distribute website, in like manner can obtain the interference value that unallocated website B is subjected to distribute website, get A and the big person of B interference value and be next website to be allocated.
Need to prove, concrete interference calculation process can for: according to the overlapping region of each minizone of covering relation between two base stations and two base stations, receive RSRP respectively and the proportionate relationship of the overlay area of the respective cell of A base station and C base station weigh interference value size between A base station and the C base station.
204, be base station assigns the 2nd Vshift to be allocated group, and be the Vshift during cell allocation the 2nd Vshift second base station in organizes;
Determined after the base station A to be allocated, calculate A base station and the interference that distributes between different Vshift group base station, base station, get the Vshift group of the Vshift group of interference value minimum as the A base station, interference total value when in like manner calculating the different Vshift of each cell allocation in the A base station is then got the Vshift as each sub-district, A base station that disturbs the total value minimum.
205, judge whether each base station to be allocated is all distributed, if then execution in step 206, if not, then execution in step 203;
206, determine the sub-clustering starting point;
After each base station to be allocated has all been distributed Vshift group, can carry out sub-clustering to the base station, at first determine the sub-clustering starting point, detailed process can for:
According to the physical location and the far and near relation of each base station in the planning zone, take concentrically ringed thought, be the sub-clustering starting point to plan that each Vshift of zone organizes lower left corner coordinate, specifically can be as shown in Figure 6.
207, according to the relation of the physical location between each base station sub-clustering is carried out in each base station and obtain non-multiplexing cluster and multiplexing cluster;
Determine after the sub-clustering starting point, according to the physical distance relation from the near to the remote of each base station and starting point sub-clustering is carried out in each base station and obtain 0 bunch to N-1 bunch successively; If the number of cells in the base station in 0 bunch to K bunch is less than or equal to maximum PCI number, and the number of cells in the base station in 0 bunch to K+1 bunch is greater than the PCI number of maximum, and then determining 0 bunch to K bunch be non-multiplexing cluster, determines that K+1 bunch to N-1 bunch is multiplexing cluster.
Concrete, after the starting point of determining sub-clustering, according to available PCI sign indicating number section, M base station with the Vshift group is cluster, be followed successively by each interior base station of planning zone according to organize the sub-clustering respectively of the far and near relation of starting point apart from each Vshift, organizing with a Vshift is example, as shown in Figure 6.Such as, in the available PCI sign indicating number, be cluster with M base station, according to planning that all interior base stations of V1 group can be divided into N bunch apart from the starting point that V1 organizes apart from distance in the zone, be classified as bunch 1 apart from M base station in the nearest V1 group of V1 group starting point, interior M the base station of inferior near V1 group is classified as bunches 2, and the like.
208, for the base station in the non-multiplexing cluster, the Vshift that distributes according to the sub-district in this base station is this base station assigns PCI group and is the cell allocation PCI in this base station;
After sub-clustering is finished, can and be cell allocation PCI in the base station to the base station assigns PCI in non-multiplexing cluster group, the foundation of distribution can be the Vshift that is assigned to before this base station organize and this base station in the Vshift that arrives of cell allocation.
Concrete, as available PCI is 0-503 PCI sign indicating number in the table 1, with 14 base stations is cluster, base station in the V1 group can be distributed 4 bunches, as shown in table 1, in 0-503 PCI sign indicating number, the corresponding PCI group of V1 group has 28 groups (left side secondary series) in the Vshift group, when distributing these 28 groups of PCI, promptly bunch 1 and bunch 2 interior base station right and wrong multiplexing.At this moment, distribute still according in each bunch, the base station is far and near to the distance of sub-clustering starting point, according to the Vshift of each cell allocation, PCI group and PCI for the cell allocation correspondence of each base station, for example, bunch 1 Vshift who distributes successively apart from nearest three sectors of base station A of sub-clustering starting point is VII, VI, VIII, the PCI group of then distributing is 6,0,12 of the 0th group of PCI correspondence in the table 1.
209,, calculate each PCI group score for the base station in the multiplexing cluster;
In the present embodiment, for the base station in the multiplexing cluster, calculate each PCI group score, specifically can calculate a certain base station in the multiplexing cluster when distributing a certain PCI group with other base stations of distributing this PCI group between score as the score of this PCI group for this base station, organize score until having calculated each PCI for this base station.
For example, base station A is when distributing the 0th group of PCI in first multiplexing cluster, want and all distribute the base station of the 0th group of PCI to calculate a score, select the score of wherein minimum score as the 0th group of PCI, and the 0th group of PCI put into candidate PCI organize, distribute the base station of the 1st group PCI to calculate a score with all again, select the score of wherein minimum score as the 1st group of PCI, and the 1st group of PCI put into candidate PCI group, the score of all PCI groups in the compute cluster successively.
For example, base station A is when distributing the 0th group of PCI, base station B is arranged simultaneously, and base station C and base station D distribute the 0th group of PCI, and then base station A calculates respectively and base station B, score between base station C and the base station D, suppose to be divided into 5 between base station A and the B, must be divided into 7 between base station A and the C, must be divided into 3 between base station A and the D, then definite the 0th group of PCI must be divided into 3 (i.e. minimum values in all scores) for base station A's, simultaneously the 0th group of PCI put into candidate PCI group;
Base station A is when distributing the 1st group of PCI, base station E is arranged simultaneously, base station F and base station G distribute the 1st group of PCI, then base station A calculates respectively and base station E, and the score between base station F and the base station G is supposed must be divided into 8 between base station A and the E, must be divided into 7 between base station A and the F, must be divided into 9 between base station A and the G, then determine the 1st group of PCI for base station A must be divided into 7 (i.e. minimum values in all scores), simultaneously the 1st group of PCI put into candidate PCI group.
Need to prove, be that example describes with two PCI groups only herein, if more PCI group is arranged, then calculates its score one by one in actual applications.
Need to prove distance between the number of plies between the score between two base stations in the present embodiment=two base stations * two base stations.
The number of plies herein is meant two base station A and B, is that diameter is drawn circle with their line, and as shown in Figure 7, the whole network falls into the number of plies that base station number in this circular scope is defined as A and B.
Need to prove, the number of plies between base station A and the B can also adopt other mode to calculate, for example can be according to the line between base station A and the B, the delta-shaped region that marks off according to the triangulation rule, and the base station number that will fall into this delta-shaped region is defined as the number of plies of A and B.
210, the PCI set of dispense of selecting PCI group score to satisfy prerequisite is given this base station, and is the cell allocation PCI in this base station according to the Vshift that the sub-district in this base station is distributed.
After the score of having calculated each PCI group, from candidate PCI group, choose the PCI set of dispense of score maximum and give this base station, and according to being the PCI of the Vshift of each cell allocation in this base station for each cell allocation correspondence.
As the aforementioned shown in the example, comprise the 0th group of PCI and the 1st group of PCI in the candidate PCI of the base station A group, wherein, the 0th group of PCI for base station A must be divided into 3, the 1 groups of PCI for base station A must be divided into 7, then distribute the 1st group of PCI to give base station A.
For example, get the PCI set of dispense of an optimum score correspondence and give base station A, be the Vshift of base station each cell allocation of A before the basis again, select the corresponding PCI of this PCI group to distribute to each sub-district, promptly after the score of having calculated each PCI group, select the PCI of the score optimum of a correspondence to give each sub-district according to the Vshift group of each base station assigns and the Vshift of each cell allocation
Be the intact PCI group of each base station assigns to be allocated, and be that cell allocation in the base station is finished after the PCI promptly exportable final assignment information.
Need to prove in the present embodiment, not have sequencing to the base station assigns process in the non-multiplexing cluster and to the base station assigns process in the multiplexing cluster.
In the present embodiment, the Physical Cell Identifier device for planning can obtain the interfere information between each base station, and be the different Vshift of each base station assigns group according to interfere information, and be corresponding Vshift in the Vshift group of this base station of cell allocation in each base station, utilize Vshift group and Vshift to determine the PCI of the sub-district of each base station again, therefore can make the PCI of final distribution can reduce overlapped and the interference between the reference signal that causes of pilot signal;
Secondly, in the present embodiment, can also carry out sub-clustering to each base station according to the relation of the physical location between each base station, and to multiplexing cluster and the different PCI allocation rule of non-multiplexing cluster employing, therefore can improve the isolation that PCI distributes, improve simultaneously and distribute and multiplexing efficient, and then avoid the PCI conflict.
Below the Physical Cell Identifier device for planning in the embodiment of the invention is described, sees also Fig. 8, the Physical Cell Identifier device for planning in the embodiment of the invention comprises:
Acquiring unit 801 is used to obtain the interfere information between each base station;
Starting point determination module 8031 is used for determining the sub-clustering starting point;
For ease of understanding, with a concrete application scenarios Physical Cell Identifier device for planning in the embodiment of the invention is described below:
In the present embodiment, for the base station of needs planning PCI, acquiring unit 801 at first calculates interfere information mutual between each base station.
Acquiring unit 801 gets access to after the interfere information between each base station, first allocation units 802 can be the different Vshift of each base station assigns group according to these interfere informations, and be the Vshift of correspondence during the Vshift of this base station of cell allocation each base station in organizes.
Each base station has the physical location of self, and then sub-clustering unit 803 concerns that according to the physical location between each base station can carry out sub-clustering to each base station obtains non-multiplexing cluster and multiplexing cluster.
In the present embodiment, the clustering process of describing among the process that sub-clustering unit 803 specifically carries out sub-clustering and the aforementioned embodiment shown in Figure 2 is consistent, repeats no more herein.
The number of PCI is limited, is 504, non-multiplexing cluster be meant not the place, base station of using the PCI that repeats bunch, corresponding, PCI then can be reused in the base station in the multiplexing cluster.
After sub-clustering is finished, second allocation units 804 can and be cell allocation PCI in the base station to the base station assigns PCI in non-multiplexing cluster group, the foundation of distribution can be the Vshift that in step 102, is assigned to before this base station organize and this base station in the Vshift that arrives of cell allocation.
Simultaneously, second allocation units 804 can also and be cell allocation PCI in the base station to the base station assigns PCI in multiplexing cluster group, and the foundation of distribution can be that each PCI organizes the score with respect to a certain base station, and the Vshift that distributes of the sub-district in this base station.
In the present embodiment, the assigning process of describing among the process that second allocation units 804 specifically carry out sub-clustering and the aforementioned embodiment shown in Figure 2 is consistent, repeats no more herein.
In the present embodiment, acquiring unit 801 can obtain the interfere information between each base station, first allocation units 802 are the different Vshift group of each base station assigns according to interfere information, and be corresponding Vshift in the Vshift group of this base station of cell allocation in each base station, second allocation units 804 utilize Vshift group and Vshift to determine the PCI of the sub-district of each base station again, therefore can make the PCI of final distribution can reduce overlapped and the interference between the reference signal that causes of pilot signal;
Secondly, in the present embodiment, sub-clustering unit 803 can also carry out sub-clustering to each base station according to the relation of the physical location between each base station, and to multiplexing cluster and the different PCI allocation rule of non-multiplexing cluster employing, therefore can improve the isolation that PCI distributes, improve simultaneously and distribute and multiplexing efficient, and then avoid the PCI conflict.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, above-mentioned program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
More than a kind of Physical Cell Identifier planing method provided by the present invention and device are described in detail, for one of ordinary skill in the art, thought according to the embodiment of the invention, part in specific embodiments and applications all can change, therefore, this description should not be construed as limitation of the present invention.
Claims (12)
1. a Physical Cell Identifier planing method is characterized in that, comprising:
Obtain the interfere information between each base station;
According to described interfere information is the different Vshift of each base station assigns group, and be the Vshift of correspondence during the Vshift of this base station of cell allocation each base station in organizes;
According to the relation of the physical location between each base station sub-clustering is carried out in each base station and obtain non-multiplexing cluster and multiplexing cluster;
For the base station in the non-multiplexing cluster, the Vshift that distributes according to the sub-district in this base station is this base station assigns PCI group and is the cell allocation PCI in this base station;
For the base station in the multiplexing cluster, calculate each PCI group score, the PCI set of dispense of selecting PCI group score to satisfy prerequisite is given this base station, and is the cell allocation PCI in this base station according to the Vshift that the sub-district in this base station is distributed.
2. method according to claim 1 is characterized in that, described is the different Vshift of each base station assigns group according to interfere information, and comprises for the Vshift of correspondence in the Vshift group of this base station of cell allocation in each base station:
Determine initial base station;
For described initial base station is distributed Vshift group, and be Vshift during the described Vshift of cell allocation in the described initial base station organizes;
Determine base station to be allocated according to the interfere information between described initial base station and other base stations, and be described base station assigns to be allocated the 2nd Vshift group, and be Vshift during described the 2nd Vshift of cell allocation in the described base station to be allocated organizes;
Repeat the step of above-mentioned definite base station to be allocated and distribution and all distributed the Vshift group, and the sub-district in each base station has all been distributed Vshift until each base station to be allocated.
3. method according to claim 2 is characterized in that, described definite initial base station comprises:
Determine the number of the adjacent base station of zero layer of each base station;
The base stations that the adjacent number of base stations of zero layer is maximum are as initial base station.
4. method according to claim 2 is characterized in that, the number of the adjacent base station of zero layer of described definite each base station comprises:
According to the division rule that presets first base station and second base station are divided and to be obtained coverage;
If do not have other base stations in the described coverage, first base station and the second base station adjacent base station of zero layer each other is set then.
5. method according to claim 2 is characterized in that, describedly determines that according to the interfere information between initial base station and other base stations base station to be allocated comprises:
Each has distributed interference sum between the base station to calculate unallocated base station and other;
To disturb the unallocated base station of sum maximum as base station to be allocated.
6. according to each described method in the claim 1 to 5, it is characterized in that, describedly each base station carried out that sub-clustering obtains non-multiplexing cluster and multiplexing cluster comprises according to the physical location between each base station relation:
Determine the sub-clustering starting point;
According to the physical distance relation from the near to the remote of each base station and described starting point sub-clustering is carried out in each base station and obtain 0 bunch to N-1 bunch successively;
If the number of cells in the base station in 0 bunch to K bunch is less than or equal to maximum PCI number, and the number of cells in the base station in 0 bunch to K+1 bunch is greater than the PCI number of described maximum, then determining described 0 bunch to K bunch is non-multiplexing cluster, determines that K+1 bunch to N-1 bunch is multiplexing cluster.
7. according to each described method in the claim 1 to 5, it is characterized in that each PCI group score of described calculating comprises:
Calculate a certain base station in the multiplexing cluster when distributing a certain PCI group with other base stations of distributing this PCI to organize between score;
With the minimum value of the score between this base station and other each base stations as the score of this PCI group for this base station;
Calculate the score of each PCI group in the manner described above for this base station.
8. method according to claim 7 is characterized in that, the PCI set of dispense that described selection PCI group score satisfies prerequisite is given this base station, and comprises for the cell allocation PCI in this base station according to the Vshift that the sub-district in this base station is distributed:
Choose for the highest PCI set of dispense of certain base station score and give this base station;
The Vshift that distributes according to the sub-district in this base station is respectively the PCI in the described PCI group of cell allocation in this base station.
9. method according to claim 7 is characterized in that, a certain base station in the described calculating multiplexing cluster when distributing a certain PCI group with other base stations of distributing this PCI to organize between score comprise:
With the product of the distance between the number of plies between first base station and second base station and first base station and second base station as the score between first base station and second base station;
The number of plies between described first base station and second base station is the number that falls into the base station in the zone of presetting, described preset regions is the border circular areas of being constructed as diameter with the line between first base station and second base station, or according to the line between first base station and second base station, the delta-shaped region that marks off according to the triangulation rule.
10. a Physical Cell Identifier device for planning is characterized in that, comprising:
Acquiring unit is used to obtain the interfere information between each base station;
First allocation units are used for being the different Vshift of each base station assigns group according to described interfere information, and be the Vshift of correspondence during the Vshift of this base station of cell allocation each base station in organizes;
The sub-clustering unit is used for according to the relation of the physical location between each base station sub-clustering being carried out in each base station and obtains non-multiplexing cluster and multiplexing cluster;
Second allocation units are used for for the base station in the non-multiplexing cluster, and the Vshift that distributes according to the sub-district in this base station is this base station assigns PCI group and is the cell allocation PCI in this base station; For the base station in the multiplexing cluster, calculate each PCI group score, the PCI set of dispense of selecting PCI group score to satisfy prerequisite is given this base station, and is the cell allocation PCI in this base station according to the Vshift that the sub-district in this base station is distributed.
11. Physical Cell Identifier device for planning according to claim 10 is characterized in that, described first allocation units comprise:
First determination module is used for determining initial base station;
First distribution module is used to described initial base station to distribute Vshift group, and be the Vshift during the described Vshift of cell allocation in described first base station organizes;
Second determination module is determined base station to be allocated according to the interfere information between described initial base station and other base stations;
Second distribution module is used to described base station assigns to be allocated the 2nd Vshift group, and be the Vshift during described the 2nd Vshift of cell allocation in described second base station organizes;
Control module is used to control described second determination module and described second distribution module and repeats above-mentionedly to determine that the step of base station to be allocated and distribution all distributed the Vshift group until each base station to be allocated, and the sub-district of each base station in accounting for all distributed Vshift.
12., it is characterized in that described sub-clustering unit comprises according to claim 10 or 11 described Physical Cell Identifier device for planning:
The starting point determination module is used for determining the sub-clustering starting point;
Executive Module is used for according to the physical distance relation from the near to the remote of each base station and described starting point sub-clustering being carried out in each base station and obtains 0 bunch to N-1 bunch successively;
Divide module, the number of cells that is used in 0 bunch to K bunch base station is less than or equal to maximum PCI number, and the number of cells in 0 bunch of base station in K+1 bunch is during greater than the PCI number of described maximum, be divided into non-multiplexing cluster with described 0 bunch to K bunch, be divided into multiplexing cluster described K+1 bunch to N-1 bunch.
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