KR100728633B1 - Wireless network coverage analysis system and method - Google Patents

Abstract

The present invention relates to a wireless network coverage analysis system and method.

Wireless network coverage analysis system of the present invention, the path loss analysis means for calculating the propagation path loss for each grid (Bin); RSSI calculating means for calculating a received signal strength value (RSSI) of each grid using the traffic power information of each base station sector and the calculated path loss; The signal quality value of the pilot channel for each base station sector is calculated for each grid using the received signal strength value, and the handoff area is determined to determine a handoff area and a service area of each sector based on the signal quality value. Way; Traffic distribution means for distributing traffic by dividing the non-handoff area and the handoff area included as a service area of two or more sectors by using each sector allocation traffic information input in advance; Eb calculating means for calculating, for each grating, a bit energy value Eb required to satisfy the bit energy Eb / Nt target value per forward total noise power spectral density; On the basis of the calculated required bit energy value, the traffic power value required for each grid is allocated, and the grid up to the point where the sum of the traffic power values allocated for each sector coincides with the previously inputted traffic power value for each sector Coverage derivation means for deriving coverage of the corresponding sector and deriving coverage of the entire wireless network; There is a technical feature in that.

Description

System and Method for Analyzing Coverage of Wireless Network

1 is a block diagram of a wireless network coverage analysis system according to an embodiment of the present invention;

2 is a view for explaining a traffic distribution method in the traffic distribution means of FIG.

3 is a flowchart sequentially illustrating a wireless network coverage analysis method according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: wireless network coverage analysis system

110: path loss analysis means

120: RSSI calculation means

130: handoff area determination means

140: traffic distribution means

150: Eb calculation means

160: coverage derivation means

The present invention relates to a wireless network coverage analysis system and method, and more particularly, wireless network coverage for fast and accurate coverage analysis by utilizing the actual traffic information of the wireless network and the traffic power information of the sector in order to optimize the operation of the wireless network. An analysis system and method.

Currently, in mobile telecommunication networks, the optimal base station location is selected through pre-prediction before planning mobile communication equipment or facility for optimization of wireless network operation, and the cell through specific wireless network analysis tool that predicts the coverage area after facility. Cell Planning is being performed.

Meanwhile, in the existing wireless network analysis tool, first, in order to derive forward coverage, (1) pathloss is analyzed to set a best server area, and each grid is based on the set area. Evenly distribute traffic.

The power value of the pilot signal transmitted from the sector of each base station is different from the power value received in each grid due to the path loss. When the base station sector having the largest received power value is selected for each grid for traffic distribution, each sector The area of the grid selected as the sector with respect to is the best server area of the sector.

Next, the conventional wireless network analysis tool (2) calculates (allocates) a required amount of traffic power according to traffic distributed by sector, and based on this, RSSI (Received Signal), which is a sum of signals received from each sector for each grid. Strength indicator) to calculate the total forward traffic power for each sector, and (3) Eb / Nt representing the energy per bit versus noise power spectral density of the forward communication channel using the forward traffic power and the RSSI.

The Eb / Nt value is a value for determining the call quality, and only the grids where the value reaches the target value correspond to the coverage area of the sector. Accordingly, the wireless network analysis tool performs a traffic power control process of repeating steps (2) and (3) several times while adjusting the traffic power of each grid so that the Eb / Nt value of each grid reaches a target value. And (4) coverage is derived using the region where the Eb / Nt value reaches the target value.

In the meantime, the coverage derivation method in the conventional wireless network analysis tool may be useful for new network analysis without the actual traffic power information of the sector, but in the case of the existing network analysis, the actual traffic power is applied when the method is applied. Because it does not use information, the very important traffic information is incorrectly entered into the analysis result, resulting in an incorrect analysis result, and since the analysis is based on the best server area, the handoff area is not analyzed. Will be derived.

In addition, according to the conventional method, the process of controlling the traffic power should be performed by not using the actual traffic power information. However, since the entire process is repeatedly performed through such traffic power control, very much analysis time is required. There is a problem that.

Accordingly, the present invention is to solve the above disadvantages and problems of the prior art, traffic information that is used in the actual network to omit the power control process when analyzing the wireless network for the optimization of the currently operating wireless network, An object of the present invention is to provide a wireless network coverage analysis system and method for providing accurate analysis results by shortening analysis time by utilizing real traffic power information of a sector and allocating traffic by analyzing a handoff area.

The above object of the present invention is a path loss analysis means for calculating a propagation path loss indicating the degree of signal attenuation from each base station sector for each grating (Bin) by applying the radio wave environment of the radio network; RSSI calculating means for calculating a received signal strength value (RSSI) of each grid (Bin) by using traffic power information of each base station sector previously input and the calculated path loss; The signal quality value of the pilot channel for each base station sector is calculated for each grid using the received signal strength value, and the handoff area is determined to determine a handoff area and a service area of each sector based on the signal quality value. Way; Traffic distribution means for distributing traffic by dividing the non-handoff area and the handoff area included as a service area of two or more sectors by using each sector allocation traffic information input in advance; Eb calculating means for calculating, for each grating, a bit energy value Eb required to satisfy the bit energy Eb / Nt target value per forward total noise power spectral density; The traffic power value required for each grid is allocated based on the calculated requested bit energy value, and the total sum of the traffic power values assigned to each grid divided into service areas of the sector for each sector is input in advance for each sector. Coverage derivation means for deciding the grids up to the point corresponding to the traffic power value as the coverage of the corresponding sector and deriving the coverage of the entire wireless network; Achieved by a wireless network coverage analysis system.

In addition, the above object of the present invention is a wireless network coverage analysis method in a wireless network analysis tool (TOOL) for analyzing the coverage of a wireless network, by applying the radio environment of the wireless network from each base station sector for each grid (Bin) Calculating a propagation path loss indicative of the degree of signal attenuation of the first signal; Calculating a received signal strength value (RSSI) of each grid (Bin) by using previously inputted traffic power information of each base station sector and the calculated path loss; Calculating a signal quality value of a pilot channel for each base station sector for each grid by using the received signal strength value; A fourth step of determining a handoff area and a service area of each sector based on the calculated signal quality value of each sector for each grid; A fifth step of distributing traffic by dividing the non-handoff area and the handoff area included in the service area of two or more sectors by using each sector allocation traffic information input in advance; Calculating, for each grating, a bit energy value (Eb) required to satisfy the bit energy (Eb / Nt) target per forward total noise power spectral density; A seventh step of calculating a traffic power value required for each grid based on the calculated requested bit energy value; For each sector, the calculated traffic power value for each grid is allocated to each grid divided into service areas of the corresponding sector, and the sum of the traffic power values assigned to each grid is equal to the previously inputted traffic power value for each sector. An eighth step of deriving coverage of the entire wireless network by determining the grids to the corresponding point as the coverage of the corresponding sector; It is achieved by a wireless network coverage analysis method consisting of.

In addition, the object of the present invention is achieved by a computer-readable recording medium recording a program for performing the wireless network coverage analysis method.

Details of the above object and technical configuration of the present invention and the resulting effects thereof will be more clearly understood from the following detailed description based on the accompanying drawings.

First, Figure 1 is a block diagram of a wireless network coverage analysis system according to an embodiment of the present invention, Figure 2 is a view for explaining a traffic distribution method in the traffic distribution means of FIG.

As shown, the wireless network coverage analysis system 100 of the present invention is the path loss analysis means 110, RSSI calculation means 120, handoff area determination means 130, traffic distribution means 140, Eb calculation Means 150 and coverage derivation means 160.

The path loss analyzing means 110 calculates a propagation path loss indicating a degree of signal attenuation from each base station sector for each grid by applying the radio wave environment of the wireless network. In this case, propagation path loss is applied to various propagation attenuation models such as point-to-point analysis model that considers obstacles such as Cost-231 model and Hata model, or 3D ray-tracing model that analyzes all obstacles between two points in three dimensions. It can be calculated, and any propagation attenuation model proposed previously may be applied.

The RSSI calculating means 120 calculates the received signal strength value RSSI of each grid Bin by using the previously input traffic power information of each base station sector and the path loss calculated by the path loss analyzing means 110. Calculate

The received signal strength indicator (RSSI) value is calculated using a total power value and a path loss analysis value of a sector, and a sector different from a received signal strength value from a magnetic sector calculated by applying a path loss analysis value for each sector. It may be a value obtained by subtracting the intensity value of the noise signal from the sum of the received signal intensity values from. Here, the total power value of each sector refers to the sum of the overhead power value representing the amount of power that is always required, even if no traffic is generated, and the traffic power value required according to the traffic generation.

Next, the handoff area determining unit 130 calculates a signal quality value of a pilot channel for each base station sector for each grid by using the received signal strength value calculated by the RSSI calculating unit 120, and the signal. A handoff area and a service area of each sector are determined based on the quality value.

Here, the signal quality value is a reference value for determining the handoff region, and in general, since the quality of the pilot channel and the call channel always maintains a constant ratio, the signal strength versus the noise strength of the pilot channel, which enables the inference of the quality of the call channel, (Ec / Io) values are used.

The handoff area determining unit 130 classifies the grids having the Ec / Io value of the specific sector more than a predetermined reference value into the service area of the corresponding sector, and then the Ec / Io value is handed off for each grid. An area of the grids that are equal to or less than a predetermined lower limit, which is a criterion for determining an area, and whose Ec / Io value calculated for the peripheral sector is equal to or larger than a certain upper limit, may be determined as the handoff area.

The traffic distribution means 140 may be a non-handoff area that is an area excluding the handoff area from the service area determined by the handoff area determining means 130 by using each sector allocation traffic information input in advance, and two or more. The traffic is distributed by dividing the handoff areas included in the service areas of the sectors.

In the conventional wireless network analysis tool that did not distinguish the handoff area, traffic was uniformly distributed to the service area of each sector regardless of the handoff area. However, in the traffic distribution means 140 of the present invention, the handoff area is not handed off. Distinguish the area from the handoff area and distribute the traffic with a uniform density for each.

At this time, since the traffic amount allocated to each sector is different from each other, it is preferable to apply an average value of the traffic amount of each sector including the handoff area as a service area to the handoff area.

Accordingly, in the present invention, the traffic distribution means 140 allocates per grid to uniformly distribute the traffic allocated to each sector to the grid included in the sector of the sector by using each sector allocation traffic input in advance. After the traffic is calculated, traffic corresponding to the average of the allocated traffic per grid of each sector serving the handoff area is distributed to the grid of the handoff area.

Next, with respect to the grid of the non-handoff area, the remaining traffic except for the traffic distributed in the handoff area is uniformly distributed in the grid of the non-handoff area in the total allocation traffic of one sector serving the area.

For example, as shown in FIG. 2, there are three base stations divided into A, B, and C, and the service areas of sector a of base station A, sector b of base station B, and sector c of base station C are shown in FIG. In the same handoff area, each of the handoff areas is ab, ba, ac, ca, bc, and cb areas included in the service areas of two sectors, and abc, bca, which are areas included in the service areas of three sectors. It can be divided into cab areas.

In this case, for each grid of the areas of ab and ba, the average of the value obtained by dividing the total traffic of sector a by the total number of grids included in the sector and the total traffic of sector b by the total number of grids included in the sector Allocates the traffic by applying the method, and allocates the traffic by applying the average of the two sectors to the other ac, ca, bc, and cb areas in the same manner.

In addition, traffic may be allocated to the abc, bca, and cab areas, which are the handoff areas included in the service areas of the three sectors, by applying an average of three sectors divided by the sum of the average traffic per grid of each sector by three, or two The sum of the average traffic of the sectors, that is, the average of sectors a and b, the average of sectors b and c, the average of sectors c and a, can be divided by 3, and the traffic can be allocated by applying the average of the averages. .

As described above, when the allocation of the traffic to the handoff area is completed, the traffic distribution means 140 subtracts the traffic allocated to the handoff area of the self sector service area from the total traffic of the own sector and distributes the remaining traffic. The remaining traffic is divided evenly by the number of grids included in the non-handoff area of the magnetic sector.

Next, the Eb calculating means 150 calculates, for each grating, the bit energy value Eb required to satisfy the bit energy Eb / Nt target value per forward total noise power spectral density. The target Eb / Nt value required for each grid of the sector is predetermined or input, and Nt, which is the power of the noise signal, is the self-traffic received signal power in the sum of the noise power value of the mobile station itself and the signal power received from the entire base station sector. Since it is calculated as the sum of power values excluding, Eb, which is a bit energy value required in a corresponding sector to achieve the target Eb / Nt, may be calculated.

The coverage derivation means 160 allocates a traffic power value required for each grid based on the calculated requested bit energy value Eb, and allocates traffic to each grid divided into service areas of the sector for each sector. The grids up to the point where the sum of the power values correspond to the traffic power values input in advance for each sector are determined as the coverage of the corresponding sector, thereby deriving the coverage of the entire wireless network.

In this case, the coverage derivation means 160 determines that a grid having a smaller Eb value is a better grid for a wireless environment, and sequentially allocates a traffic power value from a grid having a small Eb value and simultaneously assigns a traffic power value. The power values of the grids are accumulated and the grids assigned the traffic power values are allocated to the sectors until the accumulated value reaches the traffic power of the sector. Determined by coverage.

If there are a plurality of grids having the same Eb value, the coverage derivation means 160 may randomly select one of the grids having the same Eb value and allocate a traffic power value. By determining the coverage of the entire wireless network is derived.

Next, a sequential operation process of the wireless network coverage analysis system 100 of the present invention described with reference to FIGS. 1 and 2 will be described with reference to FIG. 3.

3 is a flowchart sequentially illustrating a wireless network coverage analysis method according to an embodiment of the present invention. First, the wireless network coverage analysis system of the present invention, that is, the wireless network analysis tool, applies a specific radio wave environment of a wireless network. After calculating the propagation path loss indicating the degree of signal attenuation from each base station sector for each grating Bin (S201), each grating is obtained by using the traffic power information of each base station sector previously input and the calculated path loss. A received signal strength value RSSI of (Bin) is calculated (S202).

Next, the wireless network coverage analysis system 100 calculates an Ec / Io value, which is a signal quality value of a pilot channel for each base station sector, for each grid by using the received signal strength value (S203). The handoff area and the service area of each sector are determined based on the sector-specific Ec / Io value for each grid (S204).

At this time, the determination of the handoff area is made by extracting an area in which the Ec / Io value for the magnetic sector is less than or equal to the handoff criterion lower limit and the Ec / Io value for the peripheral sector is greater than or equal to the handoff criterion upper limit.

Next, the wireless network coverage analysis system 100 distributes the traffic by dividing the handoff area included as a non-handoff area and a service area of two or more sectors by using each sector allocation traffic information input in advance. (S205) For each grating, a bit energy value Eb required to satisfy the bit energy Eb / Nt target value per forward total noise power spectral density is calculated (S206).

When the required bit energy value is calculated as described above, the wireless network coverage analysis system 100 sequentially allocates the traffic power value in the order of the required bit energy value in the order of the smallest required bit energy for each sector. Each grid is sorted in ascending order (S207), and the traffic power value is calculated from the grid having the smallest required bit energy value based on the required bit energy value of the grid and allocated to the grid. The allocated traffic power values of the allocated grids are accumulated (S208).

Each time the traffic power value is accumulated and updated, the wireless network coverage analysis system 100 determines whether the total sum of the accumulated traffic power values has reached the total traffic power value for the corresponding sector (S209). In one case, coverage is derived by determining the grids to which the traffic power is allocated in step S208 as the coverage of the corresponding sector (S210).

If it has not reached, it returns to step S208 again and allocates traffic to the grid with the next smaller required bit energy value. In this process, the sum of the accumulated traffic power values is the total traffic power value for the sector. It is repeated until is reached, and the coverage for each sector is determined as described above, resulting in the coverage of the entire wireless network.

As those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features, the embodiments described above should be understood as illustrative and not restrictive in all aspects. Should be. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

Therefore, according to the wireless network coverage analysis system and method of the present invention, when the coverage analysis for the currently operating wireless network, by using the traffic information used in the actual network and the actual traffic power information of the sector, the power control process Since it can be omitted, the analysis time can be shortened. By analyzing the handoff area and allocating traffic by dividing the handoff area and the non-handoff area, it is possible to prevent inaccurate analysis results due to the redundant distribution of traffic. This has the effect of providing accurate analysis results.

Claims (15)

Path loss analysis means for calculating a propagation path loss indicating a degree of signal attenuation from each base station sector for each grid by applying a radio wave environment of a wireless network; RSSI calculating means for calculating a received signal strength value (RSSI) of each grid (Bin) by using traffic power information of each base station sector previously input and the calculated path loss; The signal quality value of the pilot channel for each base station sector is calculated for each grid using the received signal strength value, and the handoff area is determined to determine a handoff area and a service area of each sector based on the signal quality value. Way; By using each sector allocation traffic input in advance, the allocation traffic per grid is calculated to uniformly distribute the traffic allocated to each sector to the grid included in the sector area of the sector. The traffic corresponding to the average of the allocated traffic per grid of each sector serving the handoff area is distributed, and for the grid of the non-handoff area, the traffic is distributed to the handoff area in the total allocated traffic of one sector serving the corresponding area. Traffic distribution means for uniformly distributing the remaining traffic except the traffic to the grid of the non-handoff region; Eb calculating means for calculating, for each grating, a bit energy value Eb required to satisfy the bit energy Eb / Nt target value per forward total noise power spectral density; The traffic power value required for each grid is allocated based on the calculated requested bit energy value, and the total sum of the traffic power values assigned to each grid divided into service areas of the sector for each sector is input in advance for each sector. Coverage derivation means for deciding the grids up to the point corresponding to the traffic power value as the coverage of the corresponding sector and deriving the coverage of the entire wireless network; Wireless network coverage analysis system, characterized in that consisting of. The method of claim 1, The handoff area determining means, A pilot channel signal strength versus noise intensity (Ec / Io) value for each sector is calculated as a signal quality value of a pilot channel for each grid. The method according to claim 1 or 2, The handoff area determining means, A wireless network coverage analysis system, wherein the area of the grids whose signal quality value calculated for the magnetic sector is less than or equal to the predetermined lower limit and the signal quality value calculated for the neighboring sector is equal to or greater than the predetermined upper limit is determined as the handoff region. . delete The method of claim 1, The coverage derivation means, Traffic power is sequentially allocated from the grid having the smallest bit energy value for each sector, and at the same time, the traffic power of the grids to which the traffic power is allocated is accumulated for each sector, and the accumulated traffic power value is previously added to the corresponding sector allocation traffic value. And determining the area of the grids to which the traffic power up to the point of arrival is determined as the coverage of the corresponding sector. A wireless network coverage analysis method in a wireless network analysis tool (TOOL) for analyzing coverage of a wireless network, A first step of calculating a propagation path loss indicating a degree of signal attenuation from each base station sector for each grid by applying a radio wave environment of a wireless network; Calculating a received signal strength value (RSSI) of each grid (Bin) by using previously inputted traffic power information of each base station sector and the calculated path loss; Calculating a signal quality value of a pilot channel for each base station sector for each grid by using the received signal strength value; A fourth step of determining a handoff area and a service area of each sector based on the calculated signal quality value of each sector for each grid; A fifth step of calculating allocation traffic per grid for uniformly distributing traffic allocated to each sector to the grid included in the sector of the sector by using each sector allocation traffic input in advance; Distributing traffic corresponding to an average of allocated traffic per grid of each sector serving the corresponding handoff region calculated in the fifth step, with respect to the grid of the handoff region; With respect to the grid of the non-handoff area, the remaining traffic except for the traffic distributed in the handoff area by the sixth step is uniformly distributed in the grid of the non-handoff area in all allocated traffic of one sector serving the area. A seventh step; An eighth step of calculating, for each grating, a bit energy value (Eb) required to satisfy the bit energy (Eb / Nt) target per forward total noise power spectral density; A ninth step of calculating a traffic power value required for each grid based on the calculated requested bit energy value; For each sector, the calculated traffic power value for each grid is allocated to each grid divided into service areas of the corresponding sector, and the sum of the traffic power values assigned to each grid matches the previously inputted traffic power value for each sector. A tenth step of deriving coverage of the entire wireless network by determining the grids up to a point to be the coverage of the corresponding sector; Wireless network coverage analysis method, characterized in that consisting of. The method of claim 6, In the fourth step, And the wireless network analysis tool calculates a pilot channel signal strength versus noise strength (Ec / Io) value for each sector as a signal quality value of a pilot channel for each grid. The method according to claim 6 or 7, In the fourth step, The wireless network analysis tool, A wireless network coverage analysis method characterized in that the area of the grids whose signal quality value calculated for the magnetic sector is less than or equal to the predetermined lower limit and the signal quality value calculated for the neighboring sector is greater than or equal to the predetermined upper limit is determined as the handoff region. . delete The method of claim 6, The tenth step, A step 10-1 of allocating the required traffic power for the corresponding grid calculated in the seventh step to the grid having the smallest bit energy value among the grids to which the traffic power is not assigned; Accumulating the traffic power of the grids to which the traffic power is allocated, for the sector; It is determined whether the accumulated traffic power value reaches a predetermined sector allocation traffic value, and if it does not reach, it returns to step 10-1. Determining a region as a coverage of the corresponding sector; And a wireless network coverage analysis method, which is performed for each sector. In the wireless network analysis tool to analyze the coverage of the wireless network, A first function of calculating a propagation path loss indicating a degree of signal attenuation from each base station sector for each grid by applying a radio wave environment of a wireless network; A second function of calculating a received signal strength value (RSSI) of each grid (Bin) by using traffic power information of each base station sector previously input and the calculated path loss; A third function of calculating a signal quality value of a pilot channel for each base station sector for each grid by using the received signal strength value; A fourth function of determining a handoff area and a service area of each sector based on the calculated signal quality value of each sector for each grid; A fifth function of calculating allocation traffic per grid for uniformly distributing the traffic allocated to each sector to the grid included in the sector of the sector by using each sector allocation traffic input in advance; A sixth function of distributing traffic corresponding to an average of allocated traffic per grid of each sector serving the corresponding handoff region calculated by the fifth process, with respect to the grid of the handoff region; With respect to the grid of the non-handoff area, the remaining traffic except for the traffic distributed in the handoff area by the sixth function is uniformly distributed in the grid of the non-handoff area in all allocated traffic of one sector serving the area. A seventh function; An eighth function for calculating, for each grating, a bit energy value (Eb) required to satisfy the bit energy (Eb / Nt) target per forward total noise power spectral density; A ninth function of calculating a traffic power value required for each grid based on the calculated requested bit energy value; For each sector, the calculated traffic power value for each grid is allocated to each grid divided into service areas of the corresponding sector, and the sum of the traffic power values assigned to each grid matches the previously inputted traffic power value for each sector. A tenth function of determining the grids up to a point to be the coverage of the corresponding sector to derive the coverage of the entire wireless network; A computer-readable recording medium that records a program for performing the task. The method of claim 11, The fourth function, A computer-readable recording medium characterized by calculating a pilot channel signal strength versus noise intensity (Ec / Io) value for each sector as a signal quality value of a pilot channel for each grid. The method according to claim 11 or 12, wherein The fourth function, And a function of determining an area of the grids in which the signal quality value calculated for the magnetic sector is less than or equal to the predetermined lower limit and the signal quality value calculated for the peripheral sector is greater than or equal to the predetermined upper limit as the handoff region. Recording media. delete The method of claim 11, The tenth function is, A step 10-1 of allocating the required traffic power for the corresponding grid calculated by the seventh function to the grid having the smallest bit energy value among the grids to which no traffic power is allocated; A step 10-2 of accumulating the traffic power of the grids to which the traffic power is allocated for the sector; It is determined whether the accumulated traffic power value has reached the corresponding sector allocation traffic value input in advance, and if it does not reach it, the process returns to step 10-1. Step 10-3, determining the area as the coverage of the sector; A computer-readable recording medium, characterized in that to perform sequentially for each sector.

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