KR100706904B1 - Sectoral Coverage Analysis Apparatus and Method Using Field Data - Google Patents

Abstract

The present invention relates to an apparatus and method for sector-by-sector coverage analysis using field data that can be utilized for coverage optimization by deriving the size of coverage for each sector using field data, which is mobile communication propagation environment measurement data.

In the sector-by-sector coverage analysis method of the present invention, a field including received field strength (RSSI), signal-to-noise ratio (Ec / Io), PN offset, and latitude / longitude values, which are data measured and collected through a mobile communication environment measurement equipment. A method for analyzing coverage by sector using data, comprising: a first step of dividing an area of a field into a predetermined unit area and calculating a representative value of received field strength and signal-to-noise ratio among the field data for each unit area; In order to remove the influence of the side lobe and the back lobe of the antenna, the second step of classifying data for each sector with reference to the PN offset information, and to remove the data for the unit area within a certain distance from the antenna of each sector and ; A third step of deriving coverage for each sector by deriving a main lobe radial direction, a coverage angle, and a maximum radiated power reaching distance of each sector by using the data on the unit area remaining after the removal; A fourth step of calculating a handoff area with an adjacent sector by using the sector-by-sector coverage derived in the third step; There is a technical feature made to include.

Description

Apparatus and Method for Analyzing Coverage of Sector Using Field Data}

1 is a block diagram of a sector-by-sector coverage analysis apparatus using field data according to an embodiment of the present invention;

2 is a flowchart illustrating a sector-by-sector coverage analysis method using field data.

<Description of Symbols for Main Parts of Drawings>

10: field data storage device 100: coverage analysis device

110: data conversion unit 120: sector-specific coverage derivation unit

130: handoff area calculator 140: field optimizer

The present invention relates to an apparatus and method for analyzing sector-by-sector coverage using field data. More specifically, the present invention relates to a sector using field data for analyzing service coverage for each sector of a base station by using field data collected through the field data collecting apparatus. The present invention relates to a star coverage analysis apparatus and method.

In mobile networks, it is very important to provide the maximum quality of service at a limited investment cost. Therefore, each mobile communication service provider analyzes fields in various ways to establish optimal service coverage.

Current coverage analysis methods include a coverage prediction method using simulation and a coverage prediction method using field measurement. The former has a problem that the deviation is very large for each region because it is a prediction using a propagation model, and the location information and various operational information of the base station must be accurately collected. The latter uses the data that best represents the situation of the field. The disadvantage is that some coverage can be measured by measuring the main road and all the back roads.

Accordingly, the present invention is to solve the above-mentioned disadvantages and problems of the prior art, the size of coverage (direction / distance / angle, etc.) by each base station or sector by effectively utilizing the field measurement value that is the most reliable data of the field It is an object of the present invention to provide an apparatus and method for sector-by-sector coverage analysis using field data for deriving the information and determining whether the coverage of each base station and sector is appropriate.

The object of the present invention is to use field data including received field strength (RSSI), signal-to-noise ratio (Ec / Io), PN offset, and latitude / longitude values, which are data measured and collected through mobile radio wave measurement equipment. A method for analyzing coverage by sector, comprising: a first step of dividing an area of a field into a predetermined unit area and calculating a representative value of received field strength and signal-to-noise ratio among the field data for each unit area; In order to remove the influence of the side lobe and the back lobe of the antenna, the second step of classifying data for each sector with reference to the PN offset information, and to remove the data for the unit area within a certain distance from the antenna of each sector and ; A third step of deriving coverage for each sector by deriving a main lobe radial direction, a coverage angle, and a maximum radiated power reaching distance of each sector by using the data on the unit area remaining after the removal; A fourth step of calculating a handoff area with an adjacent sector by using the sector-by-sector coverage derived in the third step; It is achieved by the sector-by-sector coverage analysis method using the field data comprising a.

In addition, the object of the present invention is a field in which field data including received field strength (RSSI), signal-to-noise ratio (Ec / Io), PN offset, and latitude / longitude values, which are data measured by a mobile communication environment measurement equipment. An apparatus for analyzing coverage by sector using the field data of a data storage device, wherein the field data stored in the field data storage device is converted into data in a spatial unit, and the area of the field is divided into a predetermined unit area, and each unit area is divided. To calculate representative values of the received electric field strength and signal-to-noise ratio among the field data, and to remove the influence of the side lobe and the back lobe of the antenna, classify the data for each sector with reference to the PN offset information, and for each sector. A data converter configured to remove data for a unit area within a predetermined distance from the antenna of the antenna; A sector-by-sector coverage derivation unit for deriving coverage of each sector by deriving a main lobe radial direction, a coverage angle, and a maximum radiated power reaching distance of each sector using the data converted by the data converter; A handoff area calculator for calculating a handoff area with an adjacent sector by using the sector-by-sector coverage derived by the sector-by-sector coverage derivation unit; It is achieved by the sector-by-sector coverage analysis apparatus using the field data comprising a.

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, FIG. 1 is a block diagram of a sector-by-sector coverage analysis apparatus using field data according to an embodiment of the present invention.

As shown, the coverage analysis apparatus 100 of the present invention analyzes coverage by base station or sector by using field data, which is measurement data for a predetermined period, which is previously measured, collected, and stored in the field data storage device 10. The apparatus includes a data converter 110, a sector-derived coverage derivation unit 120, a handoff area calculator 130, and a field optimizer 140.

In the present invention, the field data is data measured through a mobile communication environment measurement equipment (DM equipment), and includes received field strength (RSSI), signal-to-noise ratio (Ec / Io), PN offset, and latitude / longitude values. The PN offset indicates which base station or which sector the corresponding measurement signal belongs to, and the latitude / longitude value indicates a data measurement position.

For coverage analysis, it is desirable to use data for about one year. Since the measurement data for national roads is one data per second, the number of data samples is derived by dividing the area of national roads by unit area.

Ec / Io is a pilot signal strength for the noise component, and the larger the value is, the more favorable it is for mobile communication to be possible, and the standard will be different for each service provider, but the specification is about -5dB, but it is generally judged to be good if it is above -10dB. .

RSSI is the received signal strength at the terminal, and includes all received signal components, and it is preferable to keep it at -90dBm or more in the specification in consideration of -105dBm or in-building service.

Since the field data of the field data storage device 10 is measurement data in units of time, the data converter 110 converts the field data into data in units of space and divides the area of the field into a predetermined unit area (BIN unit). For each unit area, a representative value of the received field strength and the signal-to-noise ratio of the field data is calculated.

This is because the measurement equipment generally measures data in units of 1 second, but the number of measurement data samples within a unit area varies depending on the moving speed of the moving vehicle while measuring data with the measurement equipment. Only one piece of data exists for.

In addition, the data converter 110 classifies the data for each sector by referring to the PN offset information and removes the influence of the side lobe and the back lobe of the antenna, and uses the latitude / longitude information to determine the distance from the antenna. Calculate and remove the data for the unit area within a certain distance (eg 200 meters) from the antenna of each sector.

Next, the sector-specific coverage derivation unit 120 derives the main lobe radial direction of each sector, the coverage angle, and the reach distance of the maximum radiated power by using the data converted by the data converter 110. Derive star coverage. In selecting the radial direction of the main lobe, since the average value is greatly influenced by the extreme value when the deviation is severe, it is preferable to use the median value of Ec / Io for each unit area.

In this case, except for the omni antenna, since most antennas are directed in a specific direction, the sector-specific coverage derivation unit 120 analyzes the refined data to derive the starting angle of the coverage and then the data in each sector. Except for the quadrant with the smallest number of samples, the remaining three quadrants are divided in units of 10 to 30 degrees, and then the median value of the number of samples in each divided angle is used.

In addition, the overall width of the coverage is preferably selected at about 95% of the center of the derived cover angle, and the maximum emission point is selected in consideration of the level of the data and the measured distance.

Referring to the operation of the sector-specific coverage derivation unit 120 in more detail, the PN, Ec / Io, and RSSI values of one unit area are calculated by the data converter 110, and one PN is calculated for one sector. When the representative value is calculated, the sector-specific coverage derivation unit 120 finds a unit area that receives a signal of the sector in a particular sector and makes a call (Best PN), and divides the sector into four equal parts in a 360-degree direction. Exclude quadrants.

Next, the remaining three quadrants are divided again into 10 degrees to count the number of samples included, and when the start angle and the end angle are found with 95% of samples except for the left and right 2.5%, the angle of coverage is calculated. .

The direction of the main lobe is to find the intermediate sample at the start and end points of the sample data and derive the angle at that time. The maximum radiated power reach is calculated from the distance between all samples and the sector and 5% from the farthest point. Coverage is the distance of the point excluding the sample.

Next, the handoff area calculator 130 calculates a handoff area with an adjacent sector by using the sector-by-sector coverage derived by the sector-specific coverage derivation unit 120.

Since the theoretically preferable value (reference value) of the handoff area with the adjacent sector is determined, the field optimizer 140 may output the comparison result and information for optimization of the calculated handoff area and the reference value.

Next, FIG. 2 is a flowchart illustrating a sector-by-sector coverage analysis method using field data, and illustrates a coverage analysis process in the coverage analysis apparatus 100 described with reference to FIG. 1.

As shown, the coverage analysis apparatus 100 first takes field data in the field data storage device 10 and converts the field data into data in spatial units (S101), so that data for each unit area is uniquely present. Representative values of RSSI and Ec / Io are calculated for each area (S102).

Next, the coverage analysis apparatus 100 classifies data for each sector, and then removes antenna proximity data within about 200 m to remove the influence of the antenna side lobe and the back lobe (S103). In this case, in order to separate the antenna proximity data, the coverage analysis apparatus 100 calculates the distance from the antenna position to the corresponding measurement position using latitude / longitude data among the field data, and the data is within a predetermined distance. Delete it.

The coverage analysis apparatus 100 analyzes the purified data to derive the direction of the main lobe (S104), derives the coverage angle (S105), and derives the reach of the maximum radiated power (S106) to determine coverage by sector. It is derived (S107).

When the coverage for each sector is derived, the coverage analysis apparatus 100 calculates a handoff area with an adjacent sector (S108), and optimizes by comparing a predetermined optimal handoff area reference value with the calculated area of the handoff area. Information is output (S109).

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 are included in the scope of the present invention. Should be.

According to the sector-specific coverage analysis apparatus and method using the field data of the present invention, since the field measurement value which is actual measurement data is used, it is possible to confirm the coverage analysis result which is closer to the actual condition than the conventional simulation method, By using the accumulated data, it is possible to check the coverage at any time by accessing the system, and it is possible to periodically grasp the change of coverage due to the changed data.

Claims (4)

Analyzes coverage by sector using field data including received field strength (RSSI), signal-to-noise ratio (Ec / Io), PN offset, and latitude / longitude values, which are measured and collected by mobile radio wave measurement equipment. As a method, Dividing the area of the field by a predetermined unit area and calculating a representative value of the received electric field strength and the signal-to-noise ratio of the field data for each unit area; In order to remove the influence of the side lobe and the back lobe of the antenna, the second step of classifying data for each sector with reference to the PN offset information, and to remove the data for the unit area within a certain distance from the antenna of each sector and ; A third step of deriving coverage for each sector by deriving a main lobe radial direction, a coverage angle, and a maximum radiated power reaching distance of each sector by using the data on the unit area remaining after the removal; A fourth step of calculating a handoff area with an adjacent sector by using the sector-by-sector coverage derived in the third step; Coverage analysis method for each sector using the field data, characterized in that made. The method of claim 1, In the third step, The sector-by-sector coverage analysis method using field data, characterized by deriving a radial direction of the main lobe by calculating an intermediate value of Ec / Io for each unit area. The field data of the field data storage device storing field data including received field strength (RSSI), signal-to-noise ratio (Ec / Io), PN offset, and latitude / longitude values, which are data measured by a mobile radio wave measurement device. An apparatus for analyzing sectoral coverage using Converting field data stored in the field data storage device into data in spatial units, dividing an area of a field into a predetermined unit area, and calculating a representative value of the received field strength and signal-to-noise ratio of the field data for each unit area; In order to remove the influence of the side lobe and back lobe of the antenna, the data conversion unit for classifying the data for each sector with reference to the PN offset information, and to remove the data for the unit area within a certain distance from the antenna of each sector; ; A sector-by-sector coverage derivation unit for deriving coverage of each sector by deriving a main lobe radial direction, a coverage angle, and a maximum radiated power reaching distance of each sector using the data converted by the data converter; A handoff area calculator for calculating a handoff area with an adjacent sector by using the sector-by-sector coverage derived by the sector-by-sector coverage derivation unit; Coverage analysis device for each sector using the field data, characterized in that made. The method of claim 3, The sector-specific coverage derivation unit, The sector-by-sector coverage analysis apparatus using the field data, characterized in that to derive the radial direction of the main lobe by calculating the median value of Ec / Io for each unit area.

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