CN101778395B - Method and device for planning physical cell identities - Google Patents
Method and device for planning physical cell identities Download PDFInfo
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- CN101778395B CN101778395B CN2010100012138A CN201010001213A CN101778395B CN 101778395 B CN101778395 B CN 101778395B CN 2010100012138 A CN2010100012138 A CN 2010100012138A CN 201010001213 A CN201010001213 A CN 201010001213A CN 101778395 B CN101778395 B CN 101778395B
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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 confirmed employing cell ID (ID; Identity) divide into groups, at first confirm sub-district ID group, confirm concrete sub-district ID through primary synchronization channel again through auxiliary synchronization channel; Be Physical Cell Identifier (PCI, Physical CellID).
In view of the ability of supporting many cell networkings, the quantity of PCI is The more the better, but 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, confirms 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 possibly 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 ";
A kind of in addition 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 according to the agreement regulation, the frequency displacement of the reference signal of different antennae configuration also need be confirmed 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 said 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 said 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.
Can find out that from above technical scheme 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 confirm the PCI of the sub-district of each base station again, therefore can make the PCI of final assignment 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 multiplexing cluster is adopted different PCI allocation rule with non-multiplexing cluster, 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 sketch map of Physical Cell Identifier planing method in the embodiment of the invention;
Fig. 2 is another embodiment sketch map of Physical Cell Identifier planing method in the embodiment of the invention;
Fig. 3 is the embodiment of the invention frequency domain reference signal sketch map in the pattern that staggers;
Fig. 4 is the reference signal sketch map 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 sketch map in the embodiment of the invention;
Fig. 6 is a sub-clustering sketch map in the embodiment of the invention;
Fig. 7 is that the number of plies is calculated sketch map in the embodiment of the invention;
Fig. 8 is a Physical Cell Identifier device for planning embodiment sketch map 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 that according to agreement 36211-870, the description of 6.10 joints can know that 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 the PCI that does not use repetition base station place 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 accomplished, can and be the cell allocation PCI in the base station to the group of the base station assigns PCI in the non-multiplexing cluster, 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 accomplished, can and be the cell allocation PCI in the base station to the group of the base station assigns PCI in the multiplexing cluster, 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 here.
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 confirm the PCI of the sub-district of each base station again, therefore can make the PCI of final assignment 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 in cell allocation the one Vshift group in first base station;
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, the scheme that all staggers with time domain is that example describes.
In this step, at first can confirm initial base station, concrete definite process is: confirm 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, and wherein A is first base station, and 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, and DG is the straight line that is parallel to diameter AB; OD=1/3AB wherein, same, EF is parallel to AB; OE=1/3AB wherein; Like the part that constitutes in place line segment of the EF among Fig. 5 and the DG place line segment,, base station A and the base station B adjacent base station of zero layer each other is set then if in the coverage of this part, there are not other base stations.
Need to prove that above-mentioned division rule is merely an example in the present embodiment, in practical application, 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 here.
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 then is as initial base station; 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 is in the hot spot region, needs the preferential PCI accuracy that guarantees these positions.
Confirmed after the initial base station; Promptly can be this initial base station and distribute Vshift group; And be the Vshift in cell allocation the one Vshift group in this initial base station; Need to prove that 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, V2 thus; 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 order according to azimuth, the sub-district size of initial base station afterwards.203, confirm 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 confirm base station to be allocated; Detailed process can each have distributed the interference sum between the base station in order to calculate unallocated base station and other; With disturbing the maximum unallocated base station of sum 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; Be the interference value that unallocated website A receives to distribute website to these three interference value additions again, in like manner can obtain the interference value that unallocated website B receives 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 the interference value size between A base station and the C base station.
204, be base station assigns the 2nd Vshift group to be allocated, and be the Vshift in cell allocation the 2nd Vshift group in second base station;
Confirmed 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 minimum Vshift group of interference value 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 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, confirm 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 confirm 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;
Confirm 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 confirming 0 bunch to K bunch be non-multiplexing cluster, confirms that K+1 bunch to N-1 bunch is multiplexing cluster.
Concrete, after the starting point of confirming sub-clustering, according to available PCI sign indicating number section; M base station with the Vshift group is cluster; Be followed successively by each base station of planning in the zone and concern sub-clustering respectively, be example with a Vshift group according to organize starting point distance apart from each Vshift, 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 accomplished, can and be the cell allocation PCI in the base station to the group of the base station assigns PCI in the non-multiplexing cluster, 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, be 0-503 PCI sign indicating number in the table 1 like available PCI, be cluster with 14 base stations; 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 multiplexing with bunch 2 interior base station right and wrong.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, be the cell allocation of each base station corresponding PCI group and PCI, for example; Bunch 1 Vshift that 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 wants and all distribute the base station of the 0th group of PCI to calculate a score when distributing the 0th group of PCI in first multiplexing cluster; 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 organize, the score that all PCI organize in the compute cluster successively.
For example, base station A has base station B simultaneously when distributing the 0th group of PCI; Base station C and base station D distribute the 0th group of PCI, and then base station A calculates respectively and base station B, the 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 has base station E simultaneously when distributing the 1st group of PCI, 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 confirm 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 here, in practical application, if more PCI group is arranged, then calculates its score one by one.
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 here is meant two base station A and B, is that diameter is drawn circle with their line, and is as shown in Figure 7, and 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 maximum PCI set of dispense of score and give this base station, and be the corresponding PCI of each cell allocation according to the Vshift that is each cell allocation in this base station.
Shown in aforesaid 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 a corresponding PCI set of dispense of optimum score 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 optimum PCI of score 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 confirm the PCI of the sub-district of each base station again, therefore can make the PCI of final assignment 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.
Describe in the face of the Physical Cell Identifier device for planning in the embodiment of the invention down, see 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 confirming 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 here.
The number of PCI is limited, is 504, non-multiplexing cluster be meant the PCI that does not use repetition base station place bunch, corresponding, PCI then can be reused in the base station in the multiplexing cluster.
After sub-clustering is accomplished; Second allocation units 804 can and be the 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 the 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 here.
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 confirm the PCI of the sub-district of each base station again, therefore can make the PCI of final assignment 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 multiplexing cluster is adopted different PCI allocation rule with non-multiplexing cluster, 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 accomplish through 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 have been carried out detailed introduction; For one of ordinary skill in the art; Thought according to the embodiment of the invention; The part that on embodiment and range of application, 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 said 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, said 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:
Confirm initial base station;
For said initial base station is distributed Vshift group, and be the Vshift in the said Vshift group of cell allocation in the said initial base station;
Interfere information according between said initial base station and other base stations is confirmed base station to be allocated, and is said base station assigns to be allocated the 2nd Vshift group, and is the Vshift in said the 2nd Vshift group of cell allocation in the said base station to be allocated;
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, said definite initial base station comprises:
Confirm 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 3 is characterized in that, the number of the adjacent base station of zero layer of said 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 said 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, saidly confirms that according to the interfere information between initial base station and other base stations base station to be allocated comprises:
Each has distributed the interference sum between the base station to calculate unallocated base station and other;
With disturbing the maximum unallocated base station of sum as base station to be allocated.
6. according to each described method in the claim 1 to 5, it is characterized in that, saidly 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:
Confirm the sub-clustering starting point;
According to the physical distance relation from the near to the remote of each base station and said 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 said maximum; Then confirming said 0 bunch to K bunch is non-multiplexing cluster, confirms 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 said 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;
The minimum value of the score between this base station and other each base stations is organized the score for this base station as this PCI;
Calculate the score of each PCI group according to aforesaid way for this base station.
8. method according to claim 7 is characterized in that, the PCI set of dispense that said 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 said 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 said 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 said first base station and second base station is the number that falls into the base station in the zone of presetting; Said 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 said 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, said first allocation units comprise:
First determination module is used for confirming initial base station;
First distribution module is used to said initial base station and distributes Vshift group, and is the Vshift in the said Vshift group of cell allocation in said first base station;
Second determination module is confirmed base station to be allocated according to the interfere information between said initial base station and other base stations;
Second distribution module is used to said base station assigns to be allocated the 2nd Vshift group, and is the Vshift in said the 2nd Vshift group of cell allocation in said second base station;
Control module is used to control said second determination module and said second distribution module and repeats above-mentionedly to confirm 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 in each base station has all been distributed Vshift.
12., it is characterized in that said 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 confirming 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 said 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 said maximum; Be divided into non-multiplexing cluster with said 0 bunch to K bunch, be divided into multiplexing cluster said K+1 bunch to N-1 bunch.
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| CN102026205A (en) * | 2010-12-29 | 2011-04-20 | 大唐移动通信设备有限公司 | Method and device for planning physical cell ID (Identification) |
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| WO2016154874A1 (en) | 2015-03-31 | 2016-10-06 | 华为技术有限公司 | Method and device for indicating physical cell identifier |
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| CN106817691B (en) * | 2015-11-27 | 2020-05-01 | 中国电信股份有限公司 | PCI (peripheral component interconnect) distribution method and device |
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| CN111263397B (en) * | 2018-11-30 | 2023-07-14 | 中国移动通信集团浙江有限公司 | Physical cell identification planning method and device |
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