CN102333320A - Method and device for judging over-area coverage - Google Patents

Abstract

The present invention discloses a method for judging cross-area coverage. The method first calculates the distance D between the source cell and the target cell of the terminal in the pre-handover cell, and takes the source cell as the center, and draws a circle with the above-mentioned distance D as the radius The geographical range within is divided into concentric circles according to the preset ring spacing δ, and the total number of cells Z located on the circumference of the above-mentioned concentric circles is counted to determine whether the above-mentioned distance D is greater than the preset cell distance threshold value T1, and the above-mentioned total number of cells Whether Z is greater than the preset interval cell number threshold value T2, if so, there is over-area coverage between the above-mentioned source cell and the target cell; otherwise, there is no over-area coverage between the above-mentioned source cell and the target cell; Area coverage judging device. The invention can automatically judge the overlay in the network, does not need manual participation, and is simple and easy to implement.

Description

Method and device for judging over-area coverage

technical field

The present invention relates to the communication field, in particular to a method and device for judging handover coverage.

Background technique

In the CDMA2000 network planning work, cell cross-coverage is a problem that cannot be ignored. The so-called over-area coverage refers to the fact that due to improper antenna height or angle setting, or other radio frequency reasons, the coverage area of the cell is much farther than the coverage area of the normal cell, so that the cell with a long distance has to be set as Adjacent cells with handoff relationship.

Overlay has a very bad influence on network planning. For a cell covered by a cross-area, it is a serious interference to a distant cell in its coverage; even if the two are configured as adjacent cells, handover can be performed, due to the multiplexing of PN (Pseudo-Noise, pseudo-noise), there is It may cause PN confusion with other neighboring cells of the far base station, and even cause errors in neighboring cells to cause the terminal to drop calls. Especially for urban areas where the number of available PNs is tight, the impact is particularly severe.

Therefore, for network optimization work, it is first necessary to determine the cell cross-over coverage problem existing in the network, and then make corresponding adjustments, such as adjusting antenna and radio frequency parameters, or modifying PN configuration, etc.

In the prior art, it is usually judged manually whether a cell in the network is over-covered based on dropped call data, combined with indicators such as performance, and there is no intelligent method.

Contents of the invention

The object of the present invention is to provide a handover coverage judgment method and device to optimize the existing handover coverage judgment method and solve the problem that manual participation is required in the handover coverage judgment method.

The present invention provides a method for judging over-area coverage, said method comprising the following steps:

Calculate the distance D between the source cell and the target cell of the terminal of the pre-handover cell;

Taking the above-mentioned source cell as the center, divide the geographical range within the circle with the above-mentioned distance D as the radius into concentric circles according to the preset ring spacing δ;

Count the total number Z of the cells located on the circumference of the above-mentioned concentric circles;

Judging whether the above-mentioned distance D is greater than the preset cell distance threshold T1, and whether the above-mentioned total number of cells Z is greater than the preset interval cell number threshold T2, if yes, there is overlay between the above-mentioned source cell and the target cell; otherwise, There is no cross coverage between the source cell and the target cell.

Preferably, in the above-mentioned step of dividing into concentric circles according to the preset ring spacing δ, if the remaining distance is less than the above-mentioned ring spacing δ, the concentric circle division ends.

Preferably, the above method further includes the following steps when the distance D is greater than the preset cell distance threshold T1, and the total number of cells Z is greater than the preset interval cell number threshold T2:

Calculating the azimuth α between the source cell and the target cell and the azimuth β between the target cell and the source cell;

Judging whether the azimuth angle α and the azimuth angle β are both within the range of the horizontal coverage angle γ between the source cell and the target cell, if so, then the source cell and the target cell have cross coverage; otherwise, the source cell and the target cell are not There is a pass-through.

Preferably, the above method further includes the following steps when both the azimuth α and the azimuth β are within the range of the horizontal coverage angle γ between the source cell and the target cell:

According to the OnewayDelay value of the pilot signal of the source cell and the target cell reported by the terminal, calculate the distance D1 from the terminal to the source cell and the distance D2 to the target cell;

Judging whether the distance D1 and the distance D2 are both smaller than the preset outer ring distance threshold value T3, if yes, there is no overreach between the source cell and the target cell; otherwise, there is overreach between the source cell and the target cell.

Preferably, the above method further includes the following steps when there is cross coverage between the source cell and the target cell:

Judging the size of the above-mentioned distance D1 and above-mentioned distance D2 and the above-mentioned outer ring distance threshold value T3 and the preset inner ring distance threshold value T4;

If the above-mentioned distance D1 and the above-mentioned distance D2 are both greater than the above-mentioned outer ring distance threshold value T3, then the above-mentioned source cell and the above-mentioned target cell overwrite each other;

If the distance D1 is greater than the outer ring distance threshold T3 and the distance D2 is smaller than the outer ring distance threshold T4, the source cell overwrites the target cell;

If the distance D1 is smaller than the outer ring distance threshold T3 and the distance D2 is larger than the outer ring distance threshold T3, the target cell overwrites the source cell.

Preferably, the above-mentioned distance D1 and the above-mentioned distance D2 are respectively calculated by the following formulas:

D1＝O1*8*244

D2＝O2*8*244

Wherein, the above O1 represents the OnewayDelay value of the pilot signal of the source cell; O2 represents the OnewayDelay value of the pilot signal of the target cell.

Preferably, the cell distance threshold T1 is equal to the product of the preset first ring number H1 and the ring distance δ.

Preferably, the above-mentioned outer ring distance threshold T3 is equal to the product of the preset second ring number H2 and the above-mentioned ring distance δ;

The inner ring distance threshold T4 is equal to the product of the preset third ring number H3 and the ring distance δ.

The present invention further provides a handover coverage judging device for judging whether there is a handover coverage phenomenon during cell handover, including a calculation module, a statistics module, a comparison module and a result module,

The above calculation module is used to calculate the distance D between the source cell and the target cell of the terminal in the pre-handover cell;

The above-mentioned statistical module is used to count the total number Z of the cells located on the divided concentric circles;

The above-mentioned comparison module is used to compare the size of the above-mentioned distance D with the preset cell distance threshold value T1, and the size of the above-mentioned total number of cells Z and the preset interval cell number threshold value T2, and send the comparison result to the above-mentioned result module;

The above-mentioned result module is used to output that there is cross coverage between the source cell and the target cell when the above-mentioned comparison result is that the above-mentioned distance D is greater than the above-mentioned cell distance threshold value T1, and the above-mentioned total number of cells Z is greater than the above-mentioned interval cell number threshold value T2 ; When the above comparison result is other, output that there is no cross coverage between the source cell and the target cell.

Preferably,

The calculation module is also used to calculate the azimuth α between the source cell and the target cell and the azimuth β between the target cell and the source cell; and calculate the distance D1 from the terminal to the source cell and the distance to the target cell distance D2;

The above-mentioned comparison module is also used to compare whether the above-mentioned azimuth α and the above-mentioned azimuth β are within the range of the horizontal coverage angle γ between the above-mentioned source cell and the target cell, and the above-mentioned distance D1 and distance D2 and the preset outer ring distance threshold value T3 and the size of the inner ring distance threshold T4;

The above-mentioned result module is used for outputting that the above-mentioned source cell and the target cell have cross coverage when the above-mentioned comparison result is that the above-mentioned azimuth angle α and the above-mentioned azimuth angle β are both within the range of the horizontal coverage angle γ between the above-mentioned source cell and the target cell; When the above-mentioned comparison result is that the above-mentioned distance D1 and the above-mentioned distance D2 are greater than the above-mentioned outer ring distance threshold value T3, the output above-mentioned source cell and the above-mentioned target cell are mutually over-covered; when the above-mentioned comparison result is that the above-mentioned distance D1 is greater than the above-mentioned outer ring distance gate When the limit value T3 and the above-mentioned distance D2 are less than the above-mentioned outer ring distance threshold value T4, the above-mentioned source cell is output to cover the above-mentioned target cell; when the above-mentioned comparison result is that the above-mentioned distance D1 is less than the above-mentioned outer ring distance threshold value T3 and the above-mentioned distance D2 When it is greater than the above-mentioned outer ring distance threshold value T3, output the above-mentioned target cell to cover the above-mentioned source cell; Within the γ range, or when the distance D1 and the distance D2 are both smaller than the preset outer ring distance threshold T3, it is output that there is no cross coverage between the source cell and the target cell.

The present invention uses the handover data reported by the base station and the terminal, by calculating the distance between the source cell and the target cell, the azimuth angle, and the distance between the terminal and the source cell and the target cell, combined with preset parameters, to determine whether there is cross-area coverage in the network, No human intervention is required, it is simple and easy to implement.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is the flow chart of the preferred embodiment of the handover coverage judging method of the present invention;

Fig. 2 is a functional block diagram of a preferred embodiment of the handover coverage judging device of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figure 1, it is a flow chart of a preferred embodiment of the method for judging the coverage of the cross-area of the present invention, and this embodiment includes the following steps:

Step S001: Calculate the distance D between the source cell A and the target cell B of the terminal in the pre-handover cell;

When the terminal cell is handed over, it is necessary to determine whether there is a cell set with over-area coverage, which can be known from the handover sampling information reported by the base station. The source cell A and the target cell B in this embodiment are the cells that need to determine whether there is an over-area coverage For a pair in the set, if there is no over-area coverage between the source cell A and the target cell B, the terminal can be handed over to the target cell. If there is over-area coverage, the over-area coverage may cause the terminal to The cells that continue to seek coverage in areas that do not exist are handed over. Of course, the judgment result of cross-area coverage is mainly used as a reference for network optimization. For example, antenna and radio frequency parameters can be adjusted according to the judgment result of cross-area coverage, or PN configuration can be modified to reduce the phenomenon of cross-area coverage in the system.

Step S002: Taking the above-mentioned source cell A as the center, divide the geographical range within the circle with the above-mentioned distance D as the radius into concentric circles according to the preset ring spacing δ;

That is, assuming that the circumference number of the concentric circles is j, the radius Rj=j*δ of the concentric circles, that is, the radius R1=δ of the concentric circles with the circumference number 1, and the radius R2 of the two concentric circles with the circumference number equal to 2δ, .. ., and so on; if the remaining distance is less than the ring spacing δ, the division of concentric circles ends.

Step S003: Count the total number Z of the cells located on the circumference of the concentric circle;

This step can first respectively count the number Nn of the sub-districts on the circumference of each concentric circle, and then calculate the total number Z of the sub-districts according to the number Nn of the sub-districts;

Assuming that the number of cells on the circumference of the first concentric circle is N1, the number of cells on the circumference of the second concentric circle is N2, ..., and the number of cells on the circumference of the jth concentric circle is Nj, then:

$\mathrm{<span\; class="notranslate">\; Z</span>}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; j</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}\mathrm{<span\; class="notranslate">\; n</span>}$

Wherein, Nn represents the number of cells on the circumference of the nth concentric circle.

For example, assuming that the ring distance δ=500m, there are 8 sub-districts on the circumference of the third concentric circle, that is, N3=8, which means that there are 8 sub-districts in a handover relationship with the source sub-district A at 1500m around the source sub-district A;

Step S004: Determine whether the above-mentioned distance D is greater than the preset cell distance threshold T1, that is, D>T1, and the total number of cells Z is greater than the preset interval cell number threshold T2, that is, Z>T2, and if so, then explain If there is cross coverage between the source cell and the target cell, execute step S005; otherwise, execute step S009;

The above-mentioned cell distance threshold T1 is equal to the product of the preset first ring number H1 and the above-mentioned ring distance δ, namely:

T1=H1*δ

For example, the first ring number H1 is 6, and the ring spacing δ=500m, then T1=3000m; if the above-mentioned interval cell number threshold T2=10, then the distance D between the source cell A and the target cell B is greater than 3000m and the cell If the total number Z is greater than 10, then there is cross coverage between the source cell and the target cell;

Step S005: Calculate the azimuth α between the source cell A and the target cell B and the azimuth β between the target cell B and the source cell A;

Step S006: Determine whether the azimuth angle α and the azimuth angle β are both within the range of the horizontal coverage angle γ between the source cell A and the target cell B, if so, it means that the source cell and the target cell have cross coverage, and step S007 is executed ; Otherwise, execute step S009;

Step S007: Calculate the distance D1 from the terminal to the source cell A and the distance D2 to the target cell B from the terminal according to the OnewayDelay values of the pilot signals of the source cell A and the target cell B reported by the terminal;

The above distance D1 is calculated by the following formula:

D1＝O1*8*244

The above distance D2 is calculated by the following formula:

D2＝O2*8*244

Wherein, the above O1 represents the OnewayDelay value of the pilot signal of the source cell A; O2 represents the OnewayDelay value of the pilot signal of the target cell B.

Step S008: Determine whether the above-mentioned distance D1 and distance D2 are both smaller than the preset outer ring distance threshold value T3, if so, execute step S009; otherwise, execute step S010;

The above-mentioned outer ring distance threshold T3 is equal to the product of the preset second ring number H2 and the above-mentioned ring distance δ, namely:

T3=H2*δ

Step S009: There is no overlay between the source cell and the target cell, end;

Step S010: Determine the size of the above-mentioned distance D1, the above-mentioned distance D2, the above-mentioned outer ring distance threshold value T3 and the preset inner ring distance threshold value T4, that is, judge the size of D1, D2 and T3, T4, if the above-mentioned distance D1 and the above-mentioned distance D2 are greater than the above-mentioned outer ring distance threshold value T3, that is, D1>T3, D2>T3, then execute step S011; if the above-mentioned distance D1 is greater than the above-mentioned outer ring distance threshold value T3 and the above-mentioned distance D2 is smaller than the above-mentioned outer ring The distance threshold value T4, that is, D1>T3, D2<T4, then execute step S012; if the above-mentioned distance D1 is smaller than the above-mentioned outer ring distance threshold value T3 and the above-mentioned distance D2 is greater than the above-mentioned outer ring distance threshold value T3, that is, D1< T3, D2>T3, execute step S013;

The above-mentioned inner ring distance threshold T4 is equal to the product of the preset third ring number H3 and the above-mentioned ring distance δ, namely:

T4=H3*δ

Step S011: the above-mentioned source cell A and the above-mentioned target cell B overwrite each other, end;

Step S012: The above-mentioned source cell A overwrites the above-mentioned target cell B, and ends;

Step S013: the above-mentioned target cell B overlays the above-mentioned source cell A, and ends.

As shown in FIG. 2 , it is a functional block diagram of a preferred embodiment of the handover coverage judging device of the present invention. The handover coverage judging device of the present invention is used to judge whether there is a handover coverage phenomenon during cell switching. This embodiment includes a calculation module 01 , statistics module 02, comparison module 03 and result module 04,

Calculation module 01, used to calculate the distance D between the source cell A and the target cell B of the terminal of the pre-handover cell; calculate the azimuth α between the above-mentioned source cell A and the target cell B and the distance between the target cell and the source cell Azimuth angle β; and calculating the distance D1 from the terminal to the source cell A and the distance D2 from the target cell B;

Statistical module 02, used to count the total number Z of the cells located on the concentric circles;

The comparison module 03 is used to compare the size of the above-mentioned distance D with the preset cell distance threshold value T1, and the size of the above-mentioned total number of cells Z and the preset interval cell number threshold value T2, and compare the above-mentioned azimuth angle α with the above-mentioned azimuth Whether the angle β is within the range of the horizontal coverage angle γ between the source cell A and the target cell B, and the size of the above distance D1 and distance D2 and the preset outer ring distance threshold value T3 and inner ring distance threshold value T4, and Send the comparison result to the result module 04;

The result module 04 is used to output that there is cross coverage between the source cell and the target cell when the comparison result is that the distance D is greater than the cell distance threshold T1, and the total number of cells Z is greater than the interval cell number threshold T2 ; When the above-mentioned comparison result is that the above-mentioned azimuth angle α and the above-mentioned azimuth angle β are all within the horizontal coverage angle γ range of the above-mentioned source cell A and the target cell B, output the above-mentioned source cell and the target cell. When the above-mentioned distance D1 and the above-mentioned distance D2 are greater than the above-mentioned outer ring distance threshold value T3, output the above-mentioned source cell A and the above-mentioned target cell B to cover each other; when the above-mentioned comparison result is that the above-mentioned distance D1 is greater than the above-mentioned outer ring distance threshold value T3 and the above-mentioned distance D2 is less than the above-mentioned outer ring distance threshold value T4, output the above-mentioned source cell A to cover the above-mentioned target cell B; When D2 is greater than the above-mentioned outer ring distance threshold value T3, output the above-mentioned target cell B to cover the above-mentioned source cell A; When the azimuth α and/or the azimuth β are not within the range of the horizontal coverage angle γ between the source cell A and the target cell B, or the distance D1 and the distance D2 are both smaller than the preset outer ring distance threshold T3, output the above There is no cross coverage between the source cell and the target cell.

The foregoing description shows and describes preferred embodiments of the present invention, but as previously stated, it should be understood that the present invention is not limited to the form disclosed herein, and should not be viewed as excluding other embodiments, but can be used in various Other combinations, modifications and circumstances, and can be modified within the scope of the inventive concept described herein, by the above teachings or by skill or knowledge in the relevant field. However, changes and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and should all be within the protection scope of the appended claims of the present invention.

Claims (10)

1. a kind of overlay judging method is characterized in that, described method comprises the following steps: Calculate the distance D between the source cell and the target cell of the terminal of the pre-handover cell; Taking the source cell as the center, dividing the geographical range within the circle with the distance D as the radius into concentric circles according to the preset ring spacing δ; Count the total number Z of cells located on the circumference of the concentric circle; Judging whether the distance D is greater than the preset cell distance threshold T1, and whether the total number of cells Z is greater than the preset interval cell number threshold T2, if so, there is overlay between the source cell and the target cell ; Otherwise, there is no handover coverage between the source cell and the target cell. 2. The method according to claim 1, characterized in that, in the step of dividing into concentric circles according to the preset ring spacing δ, if the remaining distance is less than the ring spacing δ, the concentric circle division ends. 3. The method according to claim 1 or 2, characterized in that, in the method, when the distance D is greater than the preset cell distance threshold T1, and the total number of cells Z is greater than the preset interval cell number gate For limit T2, the following steps are also included: calculating an azimuth α between the source cell and the target cell and an azimuth β between the target cell and the source cell; Judging whether the azimuth α and the azimuth β are both within the range of the horizontal coverage angle γ between the source cell and the target cell, if yes, there is overlay between the source cell and the target cell; otherwise, the source cell There is no cross coverage between the cell and the target cell. 4. The method according to claim 3, characterized in that, when the azimuth angle α and the azimuth angle β are both within the range of the horizontal coverage angle γ between the source cell and the target cell, the method further comprises The following steps: According to the OnewayDelay value of the pilot signal of the source cell and the target cell reported by the terminal, calculate the distance D1 from the terminal to the source cell and the distance D2 to the target cell; Judging whether the distance D1 and the distance D2 are both smaller than the preset outer ring distance threshold value T3, if yes, there is no crossover coverage between the source cell and the target cell; otherwise, there is crossover between the source cell and the target cell cover. 5. The method according to claim 4, characterized in that, when the source cell and the target cell have cross coverage, the method further comprises the following steps: Judging the size of the distance D1 and the distance D2 from the outer ring distance threshold T3 and the preset inner ring distance threshold T4; If both the distance D1 and the distance D2 are greater than the outer ring distance threshold T3, then the source cell and the target cell overwrite each other; If the distance D1 is greater than the outer ring distance threshold T3 and the distance D2 is smaller than the outer ring distance threshold T4, then the source cell overwrites the target cell; If the distance D1 is smaller than the outer ring distance threshold T3 and the distance D2 is larger than the outer ring distance threshold T3, then the target cell overwrites the source cell. 6. The method according to claim 4, wherein the distance D1 and the distance D2 are respectively calculated by the following formula: D1＝O1*8*244 D2＝O2*8*244 Wherein, the O1 represents the OnewayDelay value of the pilot signal of the source cell; O2 represents the OnewayDelay value of the pilot signal of the target cell. 7. The method according to claim 1, wherein the cell distance threshold T1 is equal to the product of a preset first ring number H1 and the ring distance δ. 8. The method of claim 5, wherein, The outer ring distance threshold T3 is equal to the product of the preset second ring number H2 and the ring distance δ; The inner ring distance threshold T4 is equal to the product of the preset third ring number H3 and the ring distance δ. 9. A device for judging cross-area coverage, used to judge whether there is an over-area coverage phenomenon when cells are handed over, it is characterized in that it includes a calculation module, a statistics module, a comparison module and a result module, The calculation module is used to calculate the distance D between the source cell and the target cell of the terminal of the pre-handover cell; The statistical module is used to count the total number Z of cells located on the divided concentric circles; The comparison module is used to compare the size of the distance D with the preset cell distance threshold value T1, and the size of the total number of cells Z and the preset interval cell number threshold value T2, and send the comparison result to the results module; The result module is configured to output the source cell when the comparison result is that the distance D is greater than the cell distance threshold T1, and the total number of cells Z is greater than the interval cell number threshold T2 There is cross coverage with the target cell; when the comparison result is other, it is output that there is no cross coverage between the source cell and the target cell. 10. The apparatus of claim 9, wherein: The calculation module is also used to calculate the azimuth α between the source cell and the target cell and the azimuth β between the target cell and the source cell; and calculate the distance D1 from the terminal to the source cell and the distance to the source cell. The distance D2 of the target cell; The comparison module is also used to compare whether the azimuth α and the azimuth β are within the range of the horizontal coverage angle γ between the source cell and the target cell, and whether the distance D1 and the distance D2 are within a preset outer range. The size of the ring distance threshold T3 and the inner ring distance threshold T4; The result module is configured to output the source cell and the target cell when the comparison result is that the azimuth α and the azimuth β are both within the range of the horizontal coverage angle γ of the source cell and the target cell There is over-area coverage; when the comparison result is that the distance D1 and the distance D2 are both greater than the outer ring distance threshold value T3, output the over-area coverage between the source cell and the target cell; The comparison result is that when the distance D1 is greater than the outer ring distance threshold T3 and the distance D2 is smaller than the outer ring distance threshold T4, output the source cell to overwrite the target cell; The comparison result is that when the distance D1 is less than the outer ring distance threshold T3 and the distance D2 is greater than the outer ring distance threshold T3, output that the target cell overwrites the source cell; and The judgment result is that the azimuth α and/or the azimuth β are not within the range of the horizontal coverage angle γ between the source cell and the target cell, or the distance D1 and the distance D2 are both smaller than the preset outer ring distance When the threshold value is T3, it is output that there is no handoff coverage between the source cell and the target cell.

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