A network pci planning multi-region target unified optimization method

Abstract

The application belongs to the technical field of PCI planning, and particularly relates to a network PCI planning multi-region target unified optimization method, which is as follows: step one, inputting checking all base station positions in a region, characteristic parameters of the base stations and PCIs corresponding to the base stations, and then calculating interference regions of the base stations according to the characteristic parameters of the base stations; step two, finding same-frequency interference regions in the checking region, calculating distances between two base stations in the same-frequency interference regions, obtaining distances between two same-frequency interference regions by subtracting radii of the interference regions between the two base stations from the distances between the two base stations, and when the distance is less than or equal to 0, it is indicated that the two same-frequency interference regions intersect, that is, the two same-frequency interference regions are intersecting same-frequency regions, and the primary synchronization codes in the intersecting same-frequency regions are modified, and the secondary synchronization codes in the interval same-frequency regions are modified, so that PCI conflicts and confusion are avoided.

Description

Technical Field

[0001] This invention relates to the field of PCI planning technology, specifically to a unified optimization method for multi-regional objectives in network PCI planning. Background Technology

[0002] PCI, or Physical Cell Identifier, is used by LTE terminals to distinguish radio signals from different cells. The LTE system provides 504 PCIs, and during network management configuration, a number between 0 and 503 is assigned to each cell. The PCI directly determines the location of the primary synchronization signal and reference signal used by each cell, and is the first network-side information identified when a terminal powers on or initially accesses a cell. PCIs need to be uniformly planned before base station configuration. When planned properly, it ensures that cells within a region use different PCIs; however, if the planning is unreasonable or changes, PCI conflicts and confusion, as well as PCI modulo 3 conflicts, will occur.

[0003] PCI conflict refers to two adjacent co-frequency cells using the same PCI; PCI confusion refers to two or more co-frequency cells in a cell's neighboring cells using the same PCI; PCI modulo 3 conflict refers to two adjacent cells having the same PCI modulo 3 (primary synchronization code) value; PCI = secondary synchronization code × 3 + primary synchronization code. When the secondary synchronization codes are different or different, the same PCI can be avoided. Since there are only three primary synchronization codes, PCI modulo 3 conflicts are inevitable as the number of cells increases. Therefore, it is necessary to track the secondary synchronization codes to avoid PCI conflicts and confusions caused by accidents. That is, the optimization of PCI planning objectives. Existing technologies perform single-objective optimization, which leads to repeated calculations and single-objective optimization is easy to affect other objectives, thus requiring other objectives to be optimized as well. Summary of the Invention

[0004] The purpose of this invention is to provide a unified optimization method for multi-regional objectives in network PCI planning, so as to solve the problem of single-objective optimization in existing PCI planning mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a unified optimization method for multi-area objectives in network PCI planning, wherein the multi-objective optimization method for network PCI planning is as follows:

[0006] Step 1: Input the locations of all base stations in the inspection area, the characteristic parameters of the base stations, and the PCI corresponding to the base stations. Then, calculate the interference area of ​​the base stations based on their characteristic parameters.

[0007] Step 2: Locate the co-channel interference areas within the inspection area. Calculate the distance between two base stations within the co-channel interference area. Subtract the radius of the interference area between the two base stations from the distance between them to obtain the distance between the two co-channel interference areas. If the distance is less than or equal to 0, it means that the two co-channel interference areas intersect, i.e., the two co-channel interference areas are intersecting co-channel areas. If the distance is greater than or equal to 0, calculate the ratio of the distance to the diameter of the largest interference area. Select two co-channel interference areas whose ratio is less than or equal to 1. These two co-channel interference areas are the spaced co-channel areas.

[0008] Step 3: Query the primary synchronization codes of the intersecting and interleaved frequency regions and the interval frequency regions. Select the intersecting frequency regions with the same primary synchronization code and modify the primary synchronization codes therein to make them different. Select the interval frequency regions with the same primary synchronization code and modify the secondary synchronization codes therein.

[0009] Preferably, in step one, when outputting the base station location information, the base station is labeled according to its location, and after calculating the interference area of ​​the base station, the interference area is labeled according to the base station's label.

[0010] Preferably, in step two, after selecting the intersecting co-frequency regions, the labels of two co-frequency interference regions within the intersecting co-frequency regions are used as subsets to establish a set of intersecting co-frequency regions, and the number of times the same interference region appears within the set of intersecting co-frequency regions is calculated.

[0011] Preferably, when the same interference area appears more than or equal to 3 times, the frequency of the interference area is modified.

[0012] Preferably, in step three, when modifying the master synchronization code, the master synchronization code of the interference region that appears less frequently in the interference region is modified.

[0013] Preferably, in step two, after selecting the interval co-frequency region, a set of interval co-frequency regions is established using the labels of two co-frequency interference regions within the interval co-frequency region as subsets, and the number of times the same interference region appears within the set of interval co-frequency regions is calculated.

[0014] Preferably, in step three, when dividing the secondary synchronization code into regions, the number of times the same interference region appears plus the value range of a pair of secondary synchronization codes are used to divide the region equally to obtain the value range of the secondary synchronization code within the interference region.

[0015] Preferably, when the secondary synchronization code within the same interference region obtains multiple value ranges, the total value of the secondary synchronization code within the interference region in different value ranges is calculated, and then the value range with the lowest total value is taken as the standard.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1) This invention searches for interference regions on the same frequency, analyzes the distance between interference regions on the same frequency to identify spaced-out and intersecting regions on the same frequency, and then searches for the primary synchronization code of PCI in the spaced-out and intersecting regions on the same frequency. It modifies the same primary synchronization code in the intersecting regions on the same frequency and modifies the secondary synchronization code in the spaced-out regions on the same frequency, thereby avoiding PCI conflicts and confusion.

[0018] 2) By establishing intersecting and spaced co-frequency regions, all optimization objectives can be gathered together. With all optimization objectives gathered together, the differences between the primary and secondary synchronization codes in the interference region of the same frequency can be accurately understood, which facilitates the rapid replacement of the primary or secondary synchronization code, thereby quickly completing the multi-objective optimization of PCI planning. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the process of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Example:

[0023] Please see Figure 1 This invention provides a technical solution: a unified optimization method for multi-area objectives in network PCI planning, which is as follows:

[0024] Step 1: Input the locations of all base stations within the inspection area, the characteristic parameters of each base station, and the corresponding PCI of each base station. Then, based on the characteristic parameters of the base stations, calculate the interference area of ​​each base station. Label each base station according to its location, denoted as Ni (e.g., base station number 1 is labeled N1, base station number 2 is labeled N2). Label the interference area according to the base station's label, denoted as Ti (e.g., the interference area of ​​base station number 1 is labeled T1, the interference area of ​​base station number 2 is labeled T2). Then calculate the diameter D of the interference area. i That is, the diameter of T1 is D1, and the diameter of T2 is D2;

[0025] Step 2: Locate the co-channel interference area within the inspection area and calculate the distance H between the two base stations within the co-channel interference area. i1，i2 For example, if the base stations in two co-channel interference areas are base station 3 and base station 5, then the distance H between the two base stations is... 3，5 The distance L between two co-channel interference areas is obtained by subtracting the radius of the interference area between the two base stations from the distance between the two base stations. i1,i2 L i1,i2 =H i1,i2 -(D i1 +D i2 When L i1,i2 If L ≤ 0, it indicates that the two interfering regions intersect, meaning they are intersecting regions with the same frequency. Therefore, L is selected. i1,i2 The distance between interference areas with a value greater than 0 is calculated, and its distance from the maximum interference area D is also calculated. imax The ratio of the diameters of the two base stations will vary depending on the base station model. To reduce computational complexity, we will use the largest interference area as an example and select two co-channel interference areas with a ratio less than or equal to 1, i.e., L. i1，i2 / DD imax ≤1, when L i1,i2 / DD imax If the value is greater than 1, it means that these two co-frequency interference regions cannot be adjacent to a certain interference region. The two co-frequency interference regions adjacent to a certain interference region are called interval co-frequency regions.

[0026] Step 3: Query the primary synchronization codes of intersecting and spaced co-frequency regions. Select co-frequency interference regions with the same primary synchronization code and modify their primary synchronization codes. Primary synchronization codes only have three values: 0, 1, and 2. If intersecting co-frequency regions have the same primary synchronization code, it will not only cause PCI modulo 3 conflict but also easily lead to identical secondary synchronization codes. Therefore, the primary synchronization codes need to be modified. Different primary synchronization codes will result in different PCI values. Select spaced co-frequency regions with the same primary synchronization code. Since the primary synchronization codes between different regions should be as different as possible, modify the secondary synchronization codes as much as possible when there is no PCI modulo 3 conflict. Divide the secondary synchronization codes into regions so that different regions use different secondary synchronization codes within the spaced co-frequency regions, thus avoiding identical PCI values. The value range of the secondary synchronization code is 0–167. Further divide the value range of the secondary synchronization code. For example, in two co-frequency interference regions within the spaced co-frequency region, the secondary synchronization code of one interference region can be between 0 and 86, while the secondary synchronization code of the other interference region can be between 87 and 167. Different secondary synchronization codes can also avoid identical PCI values.

[0027] Step 2: After selecting the intersecting co-frequency regions, establish a set of intersecting co-frequency regions by using the labels of two co-frequency interference regions within the intersecting co-frequency regions as subsets. For example, if the co-frequency interference regions include T1 and T6, T1 and T4, T2 and T5, T3 and T6, T1 and T7, etc., then the set of intersecting co-frequency regions is {(T1, T6), (T1, T4), (T2, T5), (T3, T6), (T1, T7)}. Calculate the number of times the same interference region appears within the set of intersecting co-frequency regions. In the example above, T1 appears three times, T6 appears twice, and T2, T3, T4, T5, and T7 each appear once. When the master synchronization codes are the same within the intersecting co-frequency regions, modify the master synchronization code of the interference region that appears less frequently. For example, if the master synchronization codes of T1 and T7 are the same, then modify the master synchronization code of T7. If T1 is modified, then the master synchronization codes of T4 and T6 also need to be searched, which will increase the modification time of the master synchronization code.

[0028] When the same interference region appears more than or equal to 3 times, it indicates that there are four co-frequency interference regions. Since there are only three master synchronization codes, it is easy for the master synchronization codes in the four co-frequency interference regions to be the same. At this time, the frequency of the interference region is modified to remove it from the co-frequency interference region, which can avoid the problem of the master synchronization codes being the same in the intersecting co-frequency regions.

[0029] Step 2: After selecting the interval co-frequency region, establish the interval co-frequency region set by using the labels of two co-frequency interfering regions within the interval co-frequency region as subsets. For example, if the co-frequency interfering regions include T9 and T15, T9 and T17, T8 and T24, T9 and T15, T12 and T17, etc., then the interval co-frequency region set is {(T9, T15), (T9, T17), (T9, T24), (T9, T16), (T12, T17)}. Calculate the number of times the same interfering region appears within the interval co-frequency region set. T9 appears four times, T17 appears twice, and T15, T12, T24, and T7 each appear once. Step 3: When dividing the secondary synchronization code into regions, use the number of times the same interfering region appears plus a pair to equally divide the range of values ​​for the secondary synchronization code. Take the larger integer at the dividing point to obtain the range of values ​​for the secondary synchronization code within the interfering region. For example, if T9 appears four times, then the secondary synchronization code range for T9 is... The distribution intervals of the code are [0, 34), [34, 68), [68, 102), [102, 136), [136, 167], which are respectively assigned to T9, T15, T16, T17, and T24. When the secondary synchronization code in the same interference area obtains multiple value ranges, the total value of the secondary synchronization code in the interference area in different value ranges is calculated, and then the value range with the lowest total value is taken as the standard, for example, T17. T17 appeared twice. When T17 is calculated alone, the distribution intervals of the secondary synchronization code of T17 are [0, 56), [56, 112), and [112, 167]. When T9 is used as the reference, the total value of T17 is 34. When T17 is used as the reference, the total value of T17 is 56. Therefore, when T17 is selected, the value range is based on T9. Then, when T12 is determined based on T17, the value range can be selected from the remaining values.

[0030] The foregoing has shown and described the basic principles and main features of the present invention and its advantages. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalents of the claims be included within the present invention, and no reference numerals in the claims should be regarded as limiting the scope of the claims.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A unified optimization method for multi-region objectives in network PCI planning, characterized in that: The multi-objective optimization method for network PCI planning is as follows: Step 1: Input the locations of all base stations in the inspection area, the characteristic parameters of the base stations, and the PCI corresponding to the base stations. Then, calculate the interference area of ​​the base stations based on their characteristic parameters. Step 2: Locate the co-channel interference areas within the inspection area. Calculate the distance between two base stations within the co-channel interference area. Subtract the radius of the interference area between the two base stations from the distance between them to obtain the distance between the two co-channel interference areas. If the distance is less than or equal to 0, it means that the two co-channel interference areas intersect, i.e., the two co-channel interference areas are intersecting co-channel areas. If the distance is greater than or equal to 0, calculate the ratio of the distance to the diameter of the largest interference area. Select two co-channel interference areas whose ratio is less than or equal to 1. These two co-channel interference areas are the spaced co-channel areas. Step 3: Query the primary synchronization codes of the intersecting co-frequency regions and the interval co-frequency regions. Select the intersecting co-frequency regions with the same primary synchronization code and modify the primary synchronization codes therein to make them different. Select the interval co-frequency regions with the same primary synchronization code and modify the secondary synchronization codes therein. In step one, when outputting the base station location information, the base station is labeled according to its location, and after calculating the interference area of ​​the base station, the interference area is labeled according to the base station's label. In step two, after selecting the interval co-frequency region, a set of interval co-frequency regions is established using the labels of two co-frequency interference regions within the interval co-frequency region as subsets, and the number of times the same interference region appears within the set of interval co-frequency regions is calculated. In step three, when dividing the secondary synchronization code into regions, the number of times the same interference region appears plus the value range of a pair of secondary synchronization codes are used to divide the region equally to obtain the value range of the secondary synchronization code within the interference region. When the secondary synchronization code within the same interference area obtains multiple value ranges, calculate the total value of the secondary synchronization code within the different value ranges in the interference area, and then take the value range with the lowest total value as the standard.

2. The method for unified optimization of multi-regional objectives in network PCI planning according to claim 1, characterized in that: In step two, after selecting the intersecting co-frequency regions, the labels of the two co-frequency interference regions within the intersecting co-frequency regions are used as subsets to establish a set of intersecting co-frequency regions, and the number of times the same interference region appears within the set of intersecting co-frequency regions is calculated.

3. The method for unified optimization of multi-regional objectives in network PCI planning according to claim 2, characterized in that: When the same interference area appears 3 times or more, the frequency of that interference area will be modified.

4. The method for unified optimization of multi-regional objectives in network PCI planning according to claim 2, characterized in that: In step three, when modifying the master synchronization code, the master synchronization code of the interference region that appears less frequently in the interference region is modified.

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