CN105792242B - Method and device for optimizing cell PCI - Google Patents
Method and device for optimizing cell PCI Download PDFInfo
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- CN105792242B CN105792242B CN201410805758.2A CN201410805758A CN105792242B CN 105792242 B CN105792242 B CN 105792242B CN 201410805758 A CN201410805758 A CN 201410805758A CN 105792242 B CN105792242 B CN 105792242B
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Abstract
The invention discloses a method for optimizing cell PCI, which comprises the steps of judging whether a penalty value of a base station is greater than a preset penalty value or not by acquiring the penalty value of the base station; if so, recombining the PCI values of all cells in the base station to obtain the minimum penalty value of the base station; if the minimum penalty value of the base station obtained after the recombination is smaller than the preset penalty value, and the PCI values of all the cells in the base station after the recombination meet the first principle and the second principle, the PCI value of each cell in the base station is the PCI value of the corresponding cell in the base station after the recombination.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for optimizing a cell PCI.
Background
Physical Cell Identity (PCI) is a unique sequence for identifying a Cell, and if PCIs in neighboring cells are the same, interference is generated, so that the PCIs of each Cell in a network need to be reasonably distributed. According to protocol specifications, PCI allocations must satisfy "conflict-free" and "confusion-free" principles.
In a Long Term Evolution (LTE) wireless network system, an operator generally adopts planning software to introduce engineering parameters, theoretically determine the neighboring cell relationship of each cell, and then allocates PCIs of each cell by using the principles of "conflict-free" and "confusion-free". Although the conventional PCI allocation method plans and optimizes the PCIs of a cell according to the principles of "conflict free" and "confusion free", many practical network situations are not considered in a real network, and thus, the PCI allocated by the conventional planning and optimization method is not an optimal scheme.
Disclosure of Invention
The invention provides a method and a device for optimizing cell PCI, and mainly aims to solve the technical problem of how to optimize and configure the cell PCI.
In order to achieve the above object, the present invention provides a method for optimizing a cell PCI, the method comprising:
acquiring an interference value combination of each cell in a base station, and acquiring a penalty value of each cell in the base station according to a first rule and a second rule which are preset, wherein the interference value combination is the PCI MOD3 value of all adjacent cells of each cell and the strongest interference value of the adjacent cells with the same PCI MOD3 value to each cell, and all the adjacent cells of each cell are all cells of other base stations with different base station IDs (identities) from those of each cell;
obtaining a penalty value of the base station, wherein the penalty value of the base station is the sum of the penalty values of all cells in the base station;
judging whether the punishment value of the base station is larger than a preset punishment value or not;
if so, recombining the PCI values of all cells in the base station to obtain the minimum penalty value of the base station;
and if the minimum penalty value of the base station obtained after the recombination is smaller than the preset penalty value and the PCI values of all the cells in the base station after the recombination meet the first principle and the second principle, the PCI value of each cell in the base station is the PCI value of the corresponding cell in the base station after the recombination.
Preferably, the obtaining the interference value combination of each cell in the base station includes:
acquiring a base station ID of a current cell and a PCI value of the current cell, and acquiring interference value sets of all neighbor cells of the current cell according to the base station ID, wherein the interference value sets at least comprise the PCIs of all the neighbor cells of the current cell and interference values corresponding to all the neighbor cells;
obtaining PCI MOD3 values of all adjacent cells of the current cell according to the PCI of all adjacent cells of the current cell;
and acquiring an interference value combination of the current cell according to the PCI MOD3 value of each adjacent cell of the current cell and the interference value corresponding to each adjacent cell.
Preferably, the obtaining the penalty value of each cell in the base station according to a preset first rule and a preset second rule includes:
selecting one of the strongest interference values in the interference combination according to the first rule, wherein the strongest interference value selected by the first rule is selected from sets of 0, 1 and 2 respectively in PCI MOD3 of non co-sited neighboring cells;
and obtaining a penalty value of the current cell according to the second rule and the selected strongest interference value, wherein the second rule is a corresponding relation between the interference value and the penalty value.
Preferably, the method further comprises:
if the punishment value of the base station is judged to be not greater than the preset punishment value, returning a result that the base station does not need to be optimized;
and if the minimum penalty value of the base station is judged to be not smaller than the preset penalty value, returning a result that the optimization of the base station is unsuccessful.
Preferably, before the PCI value of each cell in the base station is the PCI value of the cell corresponding to the recombined base station, the method further includes:
judging whether the minimum penalty value of the base station is smaller than a preset penalty value or not;
if so, judging whether the PCI values of all the cells in the base station after the recombination meet a first principle and a second principle, wherein the first principle is that adjacent cells cannot use the same PCI value, and the second principle is that all the adjacent cells of one cell cannot have the same-frequency adjacent cells using the same PCI value.
Preferably, after the determining whether the PCI values of all cells in the base station after the recombining satisfy the first principle and the second principle, the method further includes:
if the PCI values of all the cells in the base station after being recombined are judged not to meet the first principle and the second principle, the PCI values are redistributed to all the cells in the base station within a preset PCI value range, so that the PCI MOD3 value of each distributed cell is the same as the PCI MOD3 value of each recombined cell, and the PCI values of each distributed cell meet the first principle and the second principle;
if the distribution is successful, the PCI value of each distributed cell is taken as an optimization result;
and if the distribution is unsuccessful, returning a result that the optimization of the base station is unsuccessful.
Preferably, the method further comprises:
during initialization, acquiring PCI combinations of all cells in the whole network under the condition of meeting the first principle and the second principle;
calculating a penalty value corresponding to each combination;
and selecting the PCI combination corresponding to the minimum penalty value as an optimization result.
The invention provides a device for optimizing cell PCI, which comprises:
a first obtaining unit, configured to obtain an interference value combination of each cell in a base station, and obtain a penalty value of each cell in the base station according to a first rule and a second rule that are preset, where the interference value combination is a value of PCI MOD3 of all neighboring cells of each cell and a strongest interference value of a neighboring cell having the same value of PCI MOD3 to each cell, and all neighboring cells of each cell are all cells of other base stations having different base station IDs from those of each cell;
a second obtaining unit, configured to obtain a penalty value of the base station, where the penalty value of the base station is a sum of penalty values of all cells in the base station;
the first judgment unit is used for judging whether the penalty value of the base station is greater than a preset penalty value or not;
a combining unit, configured to, if yes, recombine the PCI values of all the cells in the base station to obtain a minimum penalty value of the base station;
and the optimization unit is used for determining the PCI value of each cell in the base station as the PCI value of the corresponding cell in the base station after the recombination if the minimum penalty value of the base station obtained after the recombination is smaller than the preset penalty value and the PCI values of all the cells in the base station after the recombination meet the first principle and the second principle.
Preferably, the first obtaining unit is further configured to:
acquiring a base station ID of a current cell and a PCI value of the current cell, and acquiring interference value sets of all neighbor cells of the current cell according to the base station ID, wherein the interference value sets at least comprise the PCIs of all the neighbor cells of the current cell and interference values corresponding to all the neighbor cells;
obtaining PCI MOD3 values of all adjacent cells of the current cell according to the PCI of all adjacent cells of the current cell;
and acquiring an interference value combination of the current cell according to the PCI MOD3 value of each adjacent cell of the current cell and the interference value corresponding to each adjacent cell.
Preferably, the first obtaining unit is further configured to:
selecting one of the strongest interference values in the interference combination according to the first rule, wherein the strongest interference value selected by the first rule is selected from sets of 0, 1 and 2 respectively in PCI MOD3 of non co-sited neighboring cells;
and obtaining a penalty value of the current cell according to the second rule and the selected strongest interference value, wherein the second rule is a corresponding relation between the interference value and the penalty value.
Preferably, the apparatus further comprises:
the first returning unit is used for returning a result that the base station does not need to be optimized if the punishment value of the base station is judged to be not greater than the preset punishment value;
and the second returning unit is used for returning a result that the base station is not successfully optimized if the minimum penalty value of the base station is judged to be not less than the preset penalty value.
Preferably, the apparatus further comprises:
the second judgment unit is used for judging whether the minimum penalty value of the base station is smaller than a preset penalty value or not;
and a third determining unit, configured to determine whether the PCI values of all cells in the base station after the reconfiguration satisfy a first principle and a second principle, where the first principle is that adjacent cells cannot use the same PCI value, and the second principle is that all adjacent cells of one cell cannot have an intra-frequency adjacent cell using the same PCI value.
Preferably, the apparatus further comprises:
an allocating unit, configured to reallocate PCI values for all cells in the base station within a preset PCI value range if it is determined that the PCI values of all cells in the base station after the reconfiguration do not satisfy the first principle and the second principle, so that the value of PCI MOD3 of each allocated cell is the same as the value of PCI MOD3 of each cell after the reconfiguration, and the PCI values of each allocated cell satisfy the first principle and the second principle;
the first processing unit is used for taking the PCI value of each distributed cell as an optimization result if the distribution is successful;
and a third returning unit, configured to return a result that the base station optimization is unsuccessful, if the allocation is unsuccessful.
Preferably, the apparatus further comprises:
a third obtaining unit, configured to obtain PCI combinations of all cells in a whole network when the first principle and the second principle are satisfied during initialization;
the calculating unit is used for calculating a penalty value corresponding to each combination;
and the second processing unit is used for selecting the PCI combination corresponding to the minimum penalty value as an optimized result.
The method comprises the steps of obtaining interference value combinations of all cells in a base station, obtaining penalty values of all cells in the base station according to a preset first rule and a preset second rule, and obtaining the penalty values of the base station, wherein the penalty values of the base station are the sum of the penalty values of all the cells in the base station; judging whether the punishment value of the base station is larger than a preset punishment value or not; if so, recombining the PCI values of all cells in the base station to obtain the minimum penalty value of the base station; if the minimum penalty value of the base station obtained after the recombination is smaller than the preset penalty value and the PCI values of all the cells in the base station after the recombination meet the first principle and the second principle, the PCI value of each cell in the base station is the PCI value of the corresponding cell in the base station after the recombination, so that the PCI configuration of an unreasonable distribution area is optimized according to the principle that the penalty cost value is as small as possible on the basis of meeting the PCI distribution principle of 'conflict-free' and 'confusion-free' in the unreasonable distribution area, and the aim of the optimal PCI configuration of a local area or a whole network area is finally achieved.
Drawings
FIG. 1 is a flowchart illustrating a first embodiment of a method for optimizing a cell PCI according to the present invention;
FIG. 2 is a flowchart illustrating a second embodiment of a method for optimizing cell PCI according to the present invention;
FIG. 3 is a flowchart illustrating a third embodiment of a method for optimizing a cell PCI according to the present invention;
FIG. 4 is a flowchart illustrating a method for optimizing a cell PCI according to a fourth embodiment of the present invention;
FIG. 5 is a flowchart illustrating a fifth embodiment of a method for optimizing cell PCI according to the present invention;
FIG. 6 is a functional block diagram of a first embodiment of the apparatus for optimizing cell PCI according to the present invention;
FIG. 7 is a functional block diagram of a second embodiment of the apparatus for optimizing cell PCI according to the present invention;
FIG. 8 is a functional block diagram of a device for optimizing cell PCI according to a third embodiment of the present invention;
FIG. 9 is a functional block diagram of an apparatus for optimizing cell PCI according to a fourth embodiment of the present invention;
fig. 10 is a functional block diagram of an apparatus for optimizing cell PCI according to a fifth embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a method for optimizing cell PCI.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for optimizing a cell PCI according to a first embodiment of the present invention.
In a first embodiment, the method for optimizing cell PCI includes:
preferably, the obtaining the interference value combination of each cell in the base station includes:
acquiring a base station ID of a current cell and a PCI value of the current cell, and acquiring interference value sets of all neighbor cells of the current cell according to the base station ID, wherein the interference value sets at least comprise the PCIs of all the neighbor cells of the current cell and interference values corresponding to all the neighbor cells;
obtaining PCI MOD3 values of all adjacent cells of the current cell according to the PCI of all adjacent cells of the current cell;
and acquiring an interference value combination of the current cell according to the PCI MOD3 value of each adjacent cell of the current cell and the interference value corresponding to each adjacent cell.
Specifically, the base station collects data reported by the terminal at fixed time intervals.
And the base station stores and decodes the acquired data and outputs an interference value set. The interference value set is a corresponding table of interference values of all primary cells and all non co-sited neighbor cells. The format of the interference value set can be adjusted according to specific conditions, and finally, the interference values of all the main cells and the non co-sited neighbor cells are obtained. The maximum number of adjacent cells in a single cell is 32, and the interference value set may include a primary cell identifier, a PCI, an adjacent cell identifier, a PCI, and an interference value of each adjacent cell.
PCI MOD3 is the remainder obtained by dividing the value of PCI by N. The following description will be given by taking N as 3 as an example.
Firstly, calculating a PCI MOD3 value of each main cell, and setting the PCI MOD3 value as X;
acquiring interference values of adjacent cells with the highest interference in MOD3 equal to 0, 1 and 2 respectively according to the interference value set of each main cell to obtain interference values of the adjacent cells with the highest interference when MOD3 is 0 corresponding to A1, A2, A3 and A1; a2 corresponds to the interference value of the neighboring cell with the maximum interference when MOD3 is 1; a3 corresponds to the interference value of the neighborhood zone with the maximum interference when MOD3 is 2.
For example: 32 adjacent cells of the main cell are provided, the PCI MOD3 is 0, and the number of the adjacent cells of 1 and 2 is respectively 10, 10 and 12; the corresponding interference values are 1-10 respectively; 3-12; 5-16, the smaller the interference value, the stronger the interference. Then the interference values of the neighboring MOD3 with values 0, 1, 2 are respectively the corresponding interference values a1, a2, A3 of 1, 3, 5.
By the method, interference value combinations of all cells PCI MOD3 of a certain base station can be obtained, and the interference value combination of each cell PCI MOD3 in the same base station is set as follows:
PCI MOD3 ═ X B ═ for cell 1 (a1, a2, A3)
PCI MOD3 of cell 2 ═ X ' B ' (a1', a2', A3 ')
PCI MOD3 of cell 3 ═ X "B" (a1 ", a 2", A3 ")
Preferably, the obtaining the penalty value of each cell in the base station according to a preset first rule and a preset second rule includes:
selecting one of the strongest interference values in the interference combination according to the first rule, wherein the strongest interference value selected by the first rule is selected from sets of 0, 1 and 2 respectively in PCI MOD3 of non co-sited neighboring cells;
and obtaining a penalty value of the current cell according to the second rule and the selected strongest interference value, wherein the second rule is a corresponding relation between the interference value and the penalty value.
Specifically, if X is equal to 0, the value of a1 is considered, if a1>9, the penalty value takes 0, if a1 is equal to 9, the interference penalty value cost1 of cell 1 takes 1, if a1 is equal to 8, the penalty value takes 2, if a1 is equal to 7, the penalty value takes 3, if a1 is equal to 6, the penalty value takes 4, if a1 is equal to 5, if a1 is equal to 4, the penalty value takes 6, if a1 is equal to 3, the penalty value takes 7, and if a1<3, the penalty value takes 20.
If X is 1, the value of a2 is seen, if a2>9, the penalty value takes 0, if a2 is 9, the interference penalty value cost1 of cell 1 takes 1, if a2 is 8, the penalty value takes 2, if a2 is 7, the penalty value takes 3, if a2 is 6, the penalty value takes 4, if a2 is 5, if a2 is 4, the penalty value takes 6, if a2 is 3, the penalty value takes 7, if a2<3, the penalty value takes 20.
If X is 2, the value of A3 is seen, if a1>9, the penalty value takes 0, if A3 is 9, the interference penalty value cost1 of cell 1 takes 1, if A3 is 8, the penalty value takes 2, if A3 is 7, the penalty value takes 3, if A3 is 6, the penalty value takes 4, if A3 is 5, if A3 is 4, the penalty value takes 6, if A3 is 3, the penalty value takes 7, if A3<3, the penalty value takes 20.
PCI MOD3 values are X 'and X' in a similar way to X, and let X 'and X' correspond to penalty values of cost2 and cost3, respectively.
102, obtaining a penalty value of the base station, wherein the penalty value of the base station is the sum of penalty values of all cells in the base station;
specifically, the total cost value of the site is as follows: cost1+ cost2+ cost 3. The interference value and the penalty value can be adjusted according to actual conditions.
103, judging whether the penalty value of the base station is greater than a preset penalty value or not;
104, if yes, recombining the PCI values of all cells in the base station to obtain a minimum penalty value of the base station;
and 105, if the minimum penalty value of the base station obtained after the recombination is smaller than a preset penalty value and the PCI values of all the cells in the base station after the recombination meet a first principle and a second principle, the PCI value of each cell in the base station is the PCI value of the corresponding cell in the base station after the recombination.
Wherein, the first principle is that adjacent cells cannot use the same PCI value, i.e. a "collision-free" PCI allocation principle; the second principle is that there is no co-frequency adjacent cell using the same PCI value in all adjacent cells of a cell, i.e. the PCI allocation principle of "no confusion".
Specifically, local PCI optimization is performed by taking a single base station as a unit, and determining whether a penalty value of each station is greater than a set penalty value threshold, and if so, performing PCI optimization on the station. First, intra-site PCI swapping is performed, assuming that a site to be optimized has three cells, because considering that the PCIs of adjacent cells are different, there are 6 combinations of PCIs for every two cell swaps, and the foregoing example is taken as an example:
assuming the interference value combinations of all cells PCI MOD3 of a certain base station, the interference value combination of each cell PCI MOD3 in the same base station is:
PCI MOD3 ═ X B ═ for cell 1 (a1, a2, A3)
PCI MOD3 of cell 2 ═ X ' B ' (a1', a2', A3 ')
PCI MOD3 of cell 3 ═ X "B" (a1 ", a 2", A3 ")
In the case of optimization, the combinations of the inversions of cell 1 and cell 2 are (XX ', X X ", X ' X, X ' X", X "X, X" X ", respectively.
If X is 0, X 'is 1, and X ″ is 2, then cost1 for the adjustment is the penalty value corresponding to a1, cost2 is the penalty value corresponding to a2', and cost3 is the penalty value corresponding to A3 ″.
One combination after the exchange is:
PCI MOD3 ═ 1B ═ for cell 1 (a1, a2, A3)
PCI MOD3 of cell 2 ═ 2B '═ (a1', a2', A3')
PCI MOD3 of cell 3 ═ 0B ═ (a1 ", a 2", A3 ")
Then the post-swap cost1 is the penalty value for A2, cost2 is the penalty value for A3 ', and cost3 is the penalty value for A1'.
According to the mode, finding the combination with the minimum total cost value, if the total cost of the combination is smaller than the original cost and smaller than or equal to the set penalty value threshold, the station is successfully optimized, and the optimized result of the station is validated and used for the PCI optimization of the following cells.
The method comprises the steps of obtaining interference value combinations of all cells in a base station, obtaining penalty values of all cells in the base station according to a preset first rule and a preset second rule, and obtaining the penalty values of the base station, wherein the penalty values of the base station are the sum of the penalty values of all the cells in the base station; judging whether the punishment value of the base station is larger than a preset punishment value or not; if so, recombining the PCI values of all cells in the base station to obtain the minimum penalty value of the base station; if the minimum penalty value of the base station obtained after the recombination is smaller than the preset penalty value and the PCI values of all the cells in the base station after the recombination meet the first principle and the second principle, the PCI value of each cell in the base station is the PCI value of the corresponding cell in the base station after the recombination, so that the PCI configuration of an unreasonable distribution area is optimized according to the principle that the penalty cost value is as small as possible on the basis of meeting the PCI distribution principle of 'conflict-free' and 'confusion-free' in the unreasonable distribution area, and the aim of the optimal PCI configuration of a local area or a whole network area is finally achieved.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for optimizing a cell PCI according to a second embodiment of the present invention.
On the basis of the first embodiment, the method for optimizing the cell PCI comprises the following steps:
step 106, if the punishment value of the base station is judged to be not greater than the preset punishment value, returning a result that the base station does not need to be optimized;
and 107, if the minimum penalty value of the base station is judged to be not smaller than the preset penalty value, returning a result that the optimization of the base station is unsuccessful.
The method comprises the steps of obtaining interference value combinations of all cells in a base station, obtaining penalty values of all cells in the base station according to a preset first rule and a preset second rule, and obtaining the penalty values of the base station, wherein the penalty values of the base station are the sum of the penalty values of all the cells in the base station; judging whether the punishment value of the base station is larger than a preset punishment value or not; if so, recombining the PCI values of all cells in the base station to obtain the minimum penalty value of the base station; if the minimum penalty value of the base station obtained after the recombination is smaller than the preset penalty value and the PCI values of all the cells in the base station after the recombination meet the first principle and the second principle, the PCI value of each cell in the base station is the PCI value of the corresponding cell in the base station after the recombination, so that the PCI configuration of an unreasonable distribution area is optimized according to the principle that the penalty cost value is as small as possible on the basis of meeting the PCI distribution principle of 'conflict-free' and 'confusion-free' in the unreasonable distribution area, and the aim of the optimal PCI configuration of a local area or a whole network area is finally achieved.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for optimizing a cell PCI according to a third embodiment of the present invention.
On the basis of the first embodiment, before step 105, the method further includes:
and step 109, if yes, judging whether the PCI values of all the cells in the base station after the recombination satisfy a first principle and a second principle, wherein the first principle is that adjacent cells cannot use the same PCI value, and the second principle is that all adjacent cells of one cell cannot have the same-frequency adjacent cell using the same PCI value.
The method comprises the steps of obtaining interference value combinations of all cells in a base station, obtaining penalty values of all cells in the base station according to a preset first rule and a preset second rule, and obtaining the penalty values of the base station, wherein the penalty values of the base station are the sum of the penalty values of all the cells in the base station; judging whether the punishment value of the base station is larger than a preset punishment value or not; if so, recombining the PCI values of all cells in the base station to obtain the minimum penalty value of the base station; if the minimum penalty value of the base station obtained after the recombination is smaller than the preset penalty value and the PCI values of all the cells in the base station after the recombination meet the first principle and the second principle, the PCI value of each cell in the base station is the PCI value of the corresponding cell in the base station after the recombination, so that the PCI configuration of an unreasonable distribution area is optimized according to the principle that the penalty cost value is as small as possible on the basis of meeting the PCI distribution principle of 'conflict-free' and 'confusion-free' in the unreasonable distribution area, and the aim of the optimal PCI configuration of a local area or a whole network area is finally achieved.
Referring to fig. 4, fig. 4 is a flowchart illustrating a method for optimizing a cell PCI according to a fourth embodiment of the present invention.
On the basis of the third embodiment, after step 109, the method further includes:
step 111, if the distribution is successful, the PCI value of each distributed cell is taken as an optimization result;
and step 112, if the distribution is unsuccessful, returning a result that the base station optimization is unsuccessful.
Specifically, if the total cost is less than the original cost and less than or equal to the set penalty value threshold, but the exchanged PCIs do not satisfy the principles of "no conflict" and "no confusion", the PCIMOD3 values need to be reallocated to each cell of the current base station, but the sequence of the PCIMOD3 values is the same as the sequence of the PCI MOD3 values adjusted by the original PCI group, that is, when the minimum penalty value is given, the PCI MOD3 value of the cell 1 is 0, the PCI MOD3 value of the cell 2 is 1, and the PCI MOD3 value of the cell 3 is 2, the adjusted PCI MOD3 value of the cell 1 is 0, the PCI MOD3 value of the cell 2 is 1, and the PCI MOD3 value of the cell 3 is 2.
If all PCI groups are traversed without the PCI group meeting the condition or the total cost of the station after optimization is smaller than the original cost but larger than the cost threshold, second round, third round and even fourth round iterative optimization adjustment are required to be carried out after the first round of PCI optimization of all cells is finished.
The method comprises the steps of obtaining interference value combinations of all cells in a base station, obtaining penalty values of all cells in the base station according to a preset first rule and a preset second rule, and obtaining the penalty values of the base station, wherein the penalty values of the base station are the sum of the penalty values of all the cells in the base station; judging whether the punishment value of the base station is larger than a preset punishment value or not; if so, recombining the PCI values of all cells in the base station to obtain the minimum penalty value of the base station; if the minimum penalty value of the base station obtained after the recombination is smaller than the preset penalty value and the PCI values of all the cells in the base station after the recombination meet the first principle and the second principle, the PCI value of each cell in the base station is the PCI value of the corresponding cell in the base station after the recombination, so that the PCI configuration of an unreasonable distribution area is optimized according to the principle that the penalty cost value is as small as possible on the basis of meeting the PCI distribution principle of 'conflict-free' and 'confusion-free' in the unreasonable distribution area, and the aim of the optimal PCI configuration of a local area or a whole network area is finally achieved.
Referring to fig. 5, fig. 5 is a flowchart illustrating a fifth embodiment of the method for optimizing a cell PCI according to the present invention.
On the basis of the first embodiment, the method for optimizing the cell PCI further includes:
step 113, in initialization, acquiring PCI combinations of all cells in the whole network under the condition of meeting the first principle and the second principle;
and step 115, selecting the PCI combination corresponding to the minimum penalty value as an optimization result.
Specifically, the whole network PCI re-planning scene is that a whole network site is taken as a unit, a whole network iteration mode is adopted to optimize PCIMOD3, and all possible combinations of PCIs of all cells of the whole network are subjected to iteration calculation, on the premise that the PCI combinations meet the principles of 'conflict-free' and 'confusion-free', each possible combination is subjected to one time of whole network Cost accumulation calculation, namely, Cost values of all cells of the whole network are added, and a PCI combination with the lowest whole network Cost value is finally obtained through comparison, wherein the combination is the optimal PCI optimization result in the whole network scene.
The method comprises the steps of obtaining interference value combinations of all cells in a base station, obtaining penalty values of all cells in the base station according to a preset first rule and a preset second rule, and obtaining the penalty values of the base station, wherein the penalty values of the base station are the sum of the penalty values of all the cells in the base station; judging whether the punishment value of the base station is larger than a preset punishment value or not; if so, recombining the PCI values of all cells in the base station to obtain the minimum penalty value of the base station; if the minimum penalty value of the base station obtained after the recombination is smaller than the preset penalty value and the PCI values of all the cells in the base station after the recombination meet the first principle and the second principle, the PCI value of each cell in the base station is the PCI value of the corresponding cell in the base station after the recombination, so that the PCI configuration of an unreasonable distribution area is optimized according to the principle that the penalty cost value is as small as possible on the basis of meeting the PCI distribution principle of 'conflict-free' and 'confusion-free' in the unreasonable distribution area, and the aim of the optimal PCI configuration of a local area or a whole network area is finally achieved.
The invention provides a device for optimizing cell PCI.
Referring to fig. 6, fig. 6 is a functional block diagram of a first embodiment of the apparatus for optimizing cell PCI according to the present invention.
In a first embodiment, the apparatus for optimizing cell PCI includes:
a first obtaining unit 601, configured to obtain an interference value combination of each cell in a base station, and obtain a penalty value of each cell in the base station according to a first rule and a second rule that are preset, where the interference value combination is a PCI MOD3 value of all neighboring cells of each cell and a strongest interference value of a neighboring cell having the same PCI MOD3 value with respect to each cell, and all neighboring cells of each cell are all cells of other base stations having different base station IDs from those of each cell;
preferably, the first obtaining unit 601 is further configured to:
acquiring a base station ID of a current cell and a PCI value of the current cell, and acquiring interference value sets of all neighbor cells of the current cell according to the base station ID, wherein the interference value sets at least comprise the PCIs of all the neighbor cells of the current cell and interference values corresponding to all the neighbor cells;
obtaining PCI MOD3 values of all adjacent cells of the current cell according to the PCI of all adjacent cells of the current cell;
and acquiring an interference value combination of the current cell according to the PCI MOD3 value of each adjacent cell of the current cell and the interference value corresponding to each adjacent cell.
Specifically, the base station collects data reported by the terminal at fixed time intervals.
And the base station stores and decodes the acquired data and outputs an interference value set. The interference value set is a corresponding table of interference values of all primary cells and all non co-sited neighbor cells. The format of the interference value set can be adjusted according to specific conditions, and finally, the interference values of all the main cells and the non co-sited neighbor cells are obtained. The maximum number of adjacent cells in a single cell is 32, and the interference value set may include a primary cell identifier, a PCI, an adjacent cell identifier, a PCI, and an interference value of each adjacent cell.
Where PCIMOD3 is the remainder of dividing the PCI value by N. The following description will be given by taking N as 3 as an example.
Firstly, calculating a PCI MOD3 value of each main cell, and setting the PCI MOD3 value as X;
acquiring interference values of adjacent cells with the highest interference in MOD3 equal to 0, 1 and 2 respectively according to the interference value set of each main cell to obtain interference values of the adjacent cells with the highest interference when MOD3 is 0 corresponding to A1, A2, A3 and A1; a2 corresponds to the interference value of the neighboring cell with the maximum interference when MOD3 is 1; a3 corresponds to the interference value of the neighborhood zone with the maximum interference when MOD3 is 2.
For example: 32 adjacent cells of the main cell are provided, the PCI MOD3 is 0, and the number of the adjacent cells of 1 and 2 is respectively 10, 10 and 12; the corresponding interference values are 1-10 respectively; 3-12; 5-16, the smaller the interference value, the stronger the interference. Then the interference values of the neighboring MOD3 with values 0, 1, 2 are respectively the corresponding interference values a1, a2, A3 of 1, 3, 5.
By the method, interference value combinations of all cells PCI MOD3 of a certain base station can be obtained, and the interference value combination of each cell PCI MOD3 in the same base station is set as follows:
PCI MOD3 ═ X B ═ for cell 1 (a1, a2, A3)
PCI MOD3 of cell 2 ═ X ' B ' (a1', a2', A3 ')
PCI MOD3 of cell 3 ═ X "B" (a1 ", a 2", A3 ")
Preferably, the first obtaining unit 601 is further configured to:
selecting one of the strongest interference values in the interference combination according to the first rule, wherein the strongest interference value selected by the first rule is selected from sets of 0, 1 and 2 respectively in PCI MOD3 of non co-sited neighboring cells;
and obtaining a penalty value of the current cell according to the second rule and the selected strongest interference value, wherein the second rule is a corresponding relation between the interference value and the penalty value.
Specifically, if X is equal to 0, the value of a1 is considered, if a1>9, the penalty value takes 0, if a1 is equal to 9, the interference penalty value cost1 of cell 1 takes 1, if a1 is equal to 8, the penalty value takes 2, if a1 is equal to 7, the penalty value takes 3, if a1 is equal to 6, the penalty value takes 4, if a1 is equal to 5, if a1 is equal to 4, the penalty value takes 6, if a1 is equal to 3, the penalty value takes 7, and if a1<3, the penalty value takes 20.
If X is 1, the value of a2 is seen, if a2>9, the penalty value takes 0, if a2 is 9, the interference penalty value cost1 of cell 1 takes 1, if a2 is 8, the penalty value takes 2, if a2 is 7, the penalty value takes 3, if a2 is 6, the penalty value takes 4, if a2 is 5, if a2 is 4, the penalty value takes 6, if a2 is 3, the penalty value takes 7, if a2<3, the penalty value takes 20.
If X is 2, the value of A3 is seen, if a1>9, the penalty value takes 0, if A3 is 9, the interference penalty value cost1 of cell 1 takes 1, if A3 is 8, the penalty value takes 2, if A3 is 7, the penalty value takes 3, if A3 is 6, the penalty value takes 4, if A3 is 5, if A3 is 4, the penalty value takes 6, if A3 is 3, the penalty value takes 7, if A3<3, the penalty value takes 20.
PCI MOD3 values are X 'and X' in a similar way to X, and let X 'and X' correspond to penalty values of cost2 and cost3, respectively.
A second obtaining unit 602, configured to obtain a penalty value of the base station, where the penalty value of the base station is a sum of penalty values of all cells in the base station;
specifically, the total cost value of the site is as follows: cost1+ cost2+ cost 3. The interference value and the penalty value can be adjusted according to actual conditions.
A first determining unit 603, configured to determine whether the penalty value of the base station is greater than a preset penalty value;
a combining unit 604, configured to, if yes, recombine the PCI values of all the cells in the base station to obtain a minimum penalty value of the base station;
an optimizing unit 605, configured to, if the minimum penalty value of the base station obtained after the recombination is smaller than a preset penalty value, and the PCI values of all the cells in the base station after the recombination satisfy the first principle and the second principle, determine the PCI value of each cell in the base station to be the PCI value of the corresponding cell in the base station after the recombination.
Wherein, the first principle is that adjacent cells cannot use the same PCI value, i.e. a "collision-free" PCI allocation principle; the second principle is that there is no co-frequency adjacent cell using the same PCI value in all adjacent cells of a cell, i.e. the PCI allocation principle of "no confusion".
Specifically, local PCI optimization is performed by taking a single base station as a unit, and determining whether a penalty value of each station is greater than a set penalty value threshold, and if so, performing PCI optimization on the station. First, intra-site PCI swapping is performed, assuming that a site to be optimized has three cells, because considering that the PCIs of adjacent cells are different, there are 6 combinations of PCIs for every two cell swaps, and the foregoing example is taken as an example:
assuming the interference value combinations of all cells PCI MOD3 of a certain base station, the interference value combination of each cell PCI MOD3 in the same base station is:
PCI MOD3 ═ X B ═ for cell 1 (a1, a2, A3)
PCI MOD3 of cell 2 ═ X ' B ' (a1', a2', A3 ')
PCI MOD3 of cell 3 ═ X "B" (a1 ", a 2", A3 ")
In the case of optimization, the combinations of the inversions of cell 1 and cell 2 are (XX ', X X ", X ' X, X ' X", X "X, X" X ", respectively.
If X is 0, X 'is 1, and X ″ is 2, then cost1 for the adjustment is the penalty value corresponding to a1, cost2 is the penalty value corresponding to a2', and cost3 is the penalty value corresponding to A3 ″.
One combination after the exchange is:
PCI MOD3 ═ 1B ═ for cell 1 (a1, a2, A3)
PCI MOD3 of cell 2 ═ 2B '═ (a1', a2', A3')
PCI MOD3 of cell 3 ═ 0B ═ (a1 ", a 2", A3 ")
Then the post-swap cost1 is the penalty value for A2, cost2 is the penalty value for A3 ', and cost3 is the penalty value for A1'.
According to the mode, finding the combination with the minimum total cost value, if the total cost of the combination is smaller than the original cost and smaller than or equal to the set penalty value threshold, the station is successfully optimized, and the optimized result of the station is validated and used for the PCI optimization of the following cells.
The method comprises the steps of obtaining interference value combinations of all cells in a base station, obtaining penalty values of all cells in the base station according to a preset first rule and a preset second rule, and obtaining the penalty values of the base station, wherein the penalty values of the base station are the sum of the penalty values of all the cells in the base station; judging whether the punishment value of the base station is larger than a preset punishment value or not; if so, recombining the PCI values of all cells in the base station to obtain the minimum penalty value of the base station; if the minimum penalty value of the base station obtained after the recombination is smaller than the preset penalty value and the PCI values of all the cells in the base station after the recombination meet the first principle and the second principle, the PCI value of each cell in the base station is the PCI value of the corresponding cell in the base station after the recombination, so that the PCI configuration of an unreasonable distribution area is optimized according to the principle that the penalty cost value is as small as possible on the basis of meeting the PCI distribution principle of 'conflict-free' and 'confusion-free' in the unreasonable distribution area, and the aim of the optimal PCI configuration of a local area or a whole network area is finally achieved.
Referring to fig. 7, fig. 7 is a functional block diagram of an apparatus for optimizing a cell PCI according to a second embodiment of the present invention.
On the basis of the first embodiment, the apparatus for optimizing cell PCI further includes:
a first returning unit 606, configured to return a result that the base station does not need to be optimized if it is determined that the penalty value of the base station is not greater than a preset penalty value;
a second returning unit 607, configured to return a result that the base station is not optimized successfully if it is determined that the minimum penalty value of the base station is not smaller than a preset penalty value.
The method comprises the steps of obtaining interference value combinations of all cells in a base station, obtaining penalty values of all cells in the base station according to a preset first rule and a preset second rule, and obtaining the penalty values of the base station, wherein the penalty values of the base station are the sum of the penalty values of all the cells in the base station; judging whether the punishment value of the base station is larger than a preset punishment value or not; if so, recombining the PCI values of all cells in the base station to obtain the minimum penalty value of the base station; if the minimum penalty value of the base station obtained after the recombination is smaller than the preset penalty value and the PCI values of all the cells in the base station after the recombination meet the first principle and the second principle, the PCI value of each cell in the base station is the PCI value of the corresponding cell in the base station after the recombination, so that the PCI configuration of an unreasonable distribution area is optimized according to the principle that the penalty cost value is as small as possible on the basis of meeting the PCI distribution principle of 'conflict-free' and 'confusion-free' in the unreasonable distribution area, and the aim of the optimal PCI configuration of a local area or a whole network area is finally achieved.
Referring to fig. 8, fig. 8 is a functional block diagram of a device for optimizing a cell PCI according to a third embodiment of the present invention.
On the basis of the first embodiment, the apparatus for optimizing cell PCI further includes:
a second determining unit 608, configured to determine whether the minimum penalty value of the base station is smaller than a preset penalty value;
a third determining unit 609, configured to determine whether the PCI values of all cells in the base station after the reassembly meet a first rule and a second rule, where the first rule is that adjacent cells cannot use the same PCI value, and the second rule is that all adjacent cells of one cell cannot have an intra-frequency adjacent cell using the same PCI value.
The method comprises the steps of obtaining interference value combinations of all cells in a base station, obtaining penalty values of all cells in the base station according to a preset first rule and a preset second rule, and obtaining the penalty values of the base station, wherein the penalty values of the base station are the sum of the penalty values of all the cells in the base station; judging whether the punishment value of the base station is larger than a preset punishment value or not; if so, recombining the PCI values of all cells in the base station to obtain the minimum penalty value of the base station; if the minimum penalty value of the base station obtained after the recombination is smaller than the preset penalty value and the PCI values of all the cells in the base station after the recombination meet the first principle and the second principle, the PCI value of each cell in the base station is the PCI value of the corresponding cell in the base station after the recombination, so that the PCI configuration of an unreasonable distribution area is optimized according to the principle that the penalty cost value is as small as possible on the basis of meeting the PCI distribution principle of 'conflict-free' and 'confusion-free' in the unreasonable distribution area, and the aim of the optimal PCI configuration of a local area or a whole network area is finally achieved.
Referring to fig. 9, fig. 9 is a functional block diagram of a device for optimizing a cell PCI according to a fourth embodiment of the present invention.
On the basis of the third embodiment, the apparatus for optimizing cell PCI further includes:
an allocating unit 610, configured to reallocate PCI values for all cells in the base station within a preset PCI value range if it is determined that the PCI values of all cells in the base station after the reassembly do not satisfy the first principle and the second principle, so that the value of PCI MOD3 of each allocated cell is the same as the value of PCI MOD3 of each cell after the reassembly, and the PCI values of each allocated cell satisfy the first principle and the second principle;
a first processing unit 611, configured to, if the allocation is successful, take the allocated PCI values of the cells as an optimization result;
a third returning unit 612, configured to return a result that the base station optimization is unsuccessful if the allocation is unsuccessful.
Specifically, if the total cost is less than the original cost and less than or equal to the set penalty value threshold, but the exchanged PCIs do not satisfy the principles of "no conflict" and "no confusion", the PCIMOD3 values need to be reallocated to each cell of the current base station, but the sequence of the PCIMOD3 values is the same as the sequence of the PCI MOD3 values adjusted by the original PCI group, that is, when the minimum penalty value is given, the PCI MOD3 value of the cell 1 is 0, the PCI MOD3 value of the cell 2 is 1, and the PCI MOD3 value of the cell 3 is 2, the adjusted PCI MOD3 value of the cell 1 is 0, the PCI MOD3 value of the cell 2 is 1, and the PCI MOD3 value of the cell 3 is 2.
If all PCI groups are traversed without the PCI group meeting the condition or the total cost of the station after optimization is smaller than the original cost but larger than the cost threshold, second round, third round and even fourth round iterative optimization adjustment are required to be carried out after the first round of PCI optimization of all cells is finished.
The method comprises the steps of obtaining interference value combinations of all cells in a base station, obtaining penalty values of all cells in the base station according to a preset first rule and a preset second rule, and obtaining the penalty values of the base station, wherein the penalty values of the base station are the sum of the penalty values of all the cells in the base station; judging whether the punishment value of the base station is larger than a preset punishment value or not; if so, recombining the PCI values of all cells in the base station to obtain the minimum penalty value of the base station; if the minimum penalty value of the base station obtained after the recombination is smaller than the preset penalty value and the PCI values of all the cells in the base station after the recombination meet the first principle and the second principle, the PCI value of each cell in the base station is the PCI value of the corresponding cell in the base station after the recombination, so that the PCI configuration of an unreasonable distribution area is optimized according to the principle that the penalty cost value is as small as possible on the basis of meeting the PCI distribution principle of 'conflict-free' and 'confusion-free' in the unreasonable distribution area, and the aim of the optimal PCI configuration of a local area or a whole network area is finally achieved.
Referring to fig. 10, fig. 10 is a functional block diagram of a fifth embodiment of the apparatus for optimizing cell PCI according to the present invention.
On the basis of the first embodiment, the apparatus for optimizing cell PCI further includes:
a third obtaining unit 613, configured to obtain PCI combinations of all cells in the entire network when the first principle and the second principle are satisfied during initialization;
a calculating unit 614, configured to calculate a penalty value corresponding to each combination;
and a second processing unit 615, configured to select a PCI combination corresponding to the smallest penalty value as an optimization result.
Specifically, the whole network PCI re-planning scene is that a whole network site is taken as a unit, a whole network iteration mode is adopted to optimize PCIMOD3, and all possible combinations of PCIs of all cells of the whole network are subjected to iteration calculation, on the premise that the PCI combinations meet the principles of 'conflict-free' and 'confusion-free', and once total Cost accumulation calculation is performed on each possible combination, namely, the Cost values of all the cells of the whole network are added, and a PCI combination with the lowest total network Cost value is finally obtained through comparison, wherein the combination is the optimal PCI optimization result in the whole network scene.
The method comprises the steps of obtaining interference value combinations of all cells in a base station, obtaining penalty values of all cells in the base station according to a preset first rule and a preset second rule, and obtaining the penalty values of the base station, wherein the penalty values of the base station are the sum of the penalty values of all the cells in the base station; judging whether the punishment value of the base station is larger than a preset punishment value or not; if so, recombining the PCI values of all cells in the base station to obtain the minimum penalty value of the base station; if the minimum penalty value of the base station obtained after the recombination is smaller than the preset penalty value and the PCI values of all the cells in the base station after the recombination meet the first principle and the second principle, the PCI value of each cell in the base station is the PCI value of the corresponding cell in the base station after the recombination, so that the PCI configuration of an unreasonable distribution area is optimized according to the principle that the penalty cost value is as small as possible on the basis of meeting the PCI distribution principle of 'conflict-free' and 'confusion-free' in the unreasonable distribution area, and the aim of the optimal PCI configuration of a local area or a whole network area is finally achieved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (14)
1. A method for optimizing a cell Physical Cell Identity (PCI), the method comprising: acquiring an interference value combination of each cell in a base station, and acquiring a penalty value of each cell in the base station according to a first rule and a second rule which are preset, wherein the interference value combination is the strongest interference value of the PCI MOD3 value of all adjacent cells of each cell and the same PCI MOD3 value of the adjacent cells to each cell, and all the adjacent cells of each cell are all cells of other base stations with different base station IDs (identities) from those of the cells;
obtaining a penalty value of the base station, wherein the penalty value of the base station is the sum of the penalty values of all cells in the base station;
judging whether the punishment value of the base station is larger than a preset punishment value or not;
if so, recombining the PCI values of all cells in the base station to obtain the minimum penalty value of the base station;
if the minimum penalty value of the base station obtained after the recombination is smaller than a preset penalty value and the PCI values of all the cells in the base station after the recombination meet a first principle and a second principle, the PCI value of each cell in the base station is the PCI value of a corresponding cell in the base station after the recombination, wherein the first principle is that adjacent cells cannot use the same PCI value; the second principle is that all the adjacent cells of a cell cannot have the same-frequency adjacent cells using the same PCI value.
2. The method of claim 1, wherein the obtaining the interference value combination of each cell in the base station comprises: acquiring a base station ID of a current cell and a PCI value of the current cell, and acquiring interference value sets of all neighbor cells of the current cell according to the base station ID, wherein the interference value sets at least comprise the PCIs of all the neighbor cells of the current cell and interference values corresponding to all the neighbor cells;
obtaining PCI MOD3 values of all adjacent cells of the current cell according to the PCI of all adjacent cells of the current cell;
and acquiring an interference value combination of the current cell according to the PCI MOD3 value of each adjacent cell of the current cell and the interference value corresponding to each adjacent cell.
3. The method according to claim 1, wherein the obtaining penalty values of each cell in the base station according to a first rule and a second rule set in advance comprises: selecting one strongest interference value from the interference value combinations according to the first rule, wherein the selected strongest interference value is selected from sets of 0, 1 and 2 respectively in PCI MOD3 of non-co-sited adjacent regions;
and obtaining a penalty value of the current cell according to the second rule and the selected strongest interference value, wherein the second rule is a corresponding relation between the interference value and the penalty value.
4. A method according to any one of claims 1 to 3, characterized in that the method further comprises: if the punishment value of the base station is judged to be not greater than the preset punishment value, returning a result that the base station does not need to be optimized;
and if the minimum penalty value of the base station is judged to be not smaller than the preset penalty value, returning a result that the optimization of the base station is unsuccessful.
5. The method of claim 1, wherein before the PCI value of each cell in the base station is the PCI value of the corresponding cell in the base station after the reconfiguration, the method further comprises: judging whether the minimum penalty value of the base station is smaller than a preset penalty value or not;
if so, judging whether the PCI values of all the cells in the base station after the recombination meet a first principle and a second principle, wherein the first principle is that adjacent cells cannot use the same PCI value, and the second principle is that all the adjacent cells of one cell cannot have the same-frequency adjacent cells using the same PCI value.
6. The method of claim 5, wherein after determining whether the PCI values of all cells in the base station after the recombining satisfy a first rule and a second rule, the method further comprises: if the PCI values of all the cells in the base station after being recombined are judged not to meet the first principle and the second principle, the PCI values are redistributed to all the cells in the base station in a preset PCI value range, so that the PCI MOD3 value of each distributed cell is the same as the PCI MOD3 value of each recombined cell, and the PCI values of each distributed cell meet the first principle and the second principle;
if the distribution is successful, the PCI value of each distributed cell is taken as an optimization result;
and if the distribution is unsuccessful, returning a result that the optimization of the base station is unsuccessful.
7. The method of claim 1, further comprising: during initialization, acquiring PCI combinations of all cells in the whole network under the condition of meeting the first principle and the second principle;
calculating a penalty value corresponding to each combination;
and selecting the PCI combination corresponding to the minimum penalty value as an optimization result.
8. An apparatus for optimizing a cell Physical Cell Identity (PCI), the apparatus comprising:
a first obtaining unit, configured to obtain an interference value combination of each cell in a base station, and obtain a penalty value of each cell in the base station according to a first rule and a second rule that are preset, where the interference value combination is a value of PCI MOD3 of all neighboring cells of each cell and a strongest interference value of a neighboring cell having the same value of PCI MOD3 to each cell, and all neighboring cells of each cell are all cells of other base stations having different base station IDs from those of each cell;
a second obtaining unit, configured to obtain a penalty value of the base station, where the penalty value of the base station is a sum of penalty values of all cells in the base station;
the first judgment unit is used for judging whether the penalty value of the base station is greater than a preset penalty value or not;
the combination unit is used for recombining the PCI values of all cells in the base station to obtain the minimum penalty value of the base station if the penalty value of the base station is greater than the preset penalty value;
an optimization unit, configured to determine a PCI value of each cell in the base station as a PCI value of a corresponding cell in the base station after the reconfiguration if the minimum penalty value of the base station obtained after the reconfiguration is smaller than a preset penalty value and the PCI values of all the cells in the base station after the reconfiguration meet a first principle and a second principle, where the first principle is that adjacent cells cannot use the same PCI value; the second principle is that all the adjacent cells of a cell cannot have the same-frequency adjacent cells using the same PCI value.
9. The apparatus of claim 8, wherein the first obtaining unit is further configured to: acquiring a base station ID of a current cell and a PCI value of the current cell, and acquiring interference value sets of all neighbor cells of the current cell according to the base station ID, wherein the interference value sets at least comprise the PCIs of all the neighbor cells of the current cell and interference values corresponding to all the neighbor cells;
obtaining PCI MOD3 values of all adjacent cells of the current cell according to the PCI of all adjacent cells of the current cell;
and acquiring an interference value combination of the current cell according to the PCI MOD3 value of each adjacent cell of the current cell and the interference value corresponding to each adjacent cell.
10. The apparatus of claim 8, wherein the first obtaining unit is further configured to: selecting one strongest interference value from the interference value combinations according to the first rule, wherein the strongest interference value selected by the first rule is selected from a set of 0, 1 and 2 respectively in PCI MOD3 of a non-co-sited adjacent region;
and obtaining a penalty value of the current cell according to the second rule and the selected strongest interference value, wherein the second rule is a corresponding relation between the interference value and the penalty value.
11. The apparatus of any one of claims 8 to 10, further comprising: the first returning unit is used for returning a result that the base station does not need to be optimized if the punishment value of the base station is judged to be not greater than the preset punishment value;
and the second returning unit is used for returning a result that the base station is not successfully optimized if the minimum penalty value of the base station is judged to be not less than the preset penalty value.
12. The apparatus of claim 8, further comprising: the second judgment unit is used for judging whether the minimum penalty value of the base station is smaller than a preset penalty value or not;
and a third determining unit, configured to determine whether the PCI values of all cells in the base station after the recombination satisfy a first principle and a second principle if the minimum penalty value of the base station is smaller than a preset penalty value, where the first principle is that adjacent cells cannot use the same PCI value, and the second principle is that there is no co-frequency adjacent cell using the same PCI value in all adjacent cells of one cell.
13. The apparatus of claim 12, further comprising: an allocating unit, configured to reallocate PCI values for all cells in the base station within a preset PCI value range if it is determined that the PCI values of all cells in the base station after the reconfiguration do not satisfy the first principle and the second principle, so that the value of PCI MOD3 of each allocated cell is the same as the value of PCI MOD3 of each cell after the reconfiguration, and the PCI values of each allocated cell satisfy the first principle and the second principle;
the first processing unit is used for taking the PCI value of each distributed cell as an optimization result if the PCI value is successfully redistributed;
and a third returning unit, configured to return a result that the base station optimization is unsuccessful, if the redistribution of the PCI value is unsuccessful.
14. The apparatus of claim 8, further comprising: a third obtaining unit, configured to obtain PCI combinations of all cells in a whole network when the first principle and the second principle are satisfied during initialization;
the calculating unit is used for calculating a penalty value corresponding to each combination;
and the second processing unit is used for selecting the PCI combination corresponding to the minimum penalty value as an optimized result.
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| CN104144430A (en) * | 2013-05-09 | 2014-11-12 | 中国移动通信集团浙江有限公司 | Physical cell identity optimizing method and device |
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