KR101960957B1 - Method and apparstus for determining coverage of base station - Google Patents

Abstract

The present invention relates to an apparatus and method for base station coverage determination. The disclosed base station coverage determination apparatus includes a base station database for storing location information of a base station through field measurement, an information extraction unit for obtaining location information of a target base station from the base station database, a plurality of handoff position information A handoff position that is the longest distance from the target base station is selected from a plurality of handoff positions where handoff is performed based on the handoff position information and the position information of the target base station, And a cell radius determining unit for determining a coverage cell radius of the target base station according to a distance between the off-location and the target base station. Accordingly, since the setting of the base station coverage permalert is not dependent on the skill level of the operator as in the prior art, there is an advantage that the optimization level of the base station coverage is always kept constant.

Description

[0001] METHOD AND APPARATUS FOR DETERMINING COVERAGE OF BASE STATION [0002]

The present invention relates to base station coverage determination, and more particularly, to a base station coverage determination apparatus and method for determining a coverage cell radius of a base station using handoff position information collected through field measurement and base station position information acquired from a base station database .

As is known, a mobile communication system enables communication between mobile communication subscribers regardless of the location of a subscriber using spatial electric waves. The system transmits and receives a message to and from a mobile communication terminal moving in an unspecified area, A plurality of base stations are required to manage the radio resources, and such base stations have coverage for managing radio resources.

Since the coverage of such a base station varies depending on the height of the base station antenna, the surrounding building, and the geographical environment, the coverage parameter for determining the coverage radius of such base station must be individually set.

In addition, after setting the coverage parameter to optimize the coverage of the base station, if the coverage of the neighboring base stations is continuously influenced by the influence of the base station antenna adjustment and the change of surrounding buildings, the operation of setting the coverage parameter for determining the coverage radius of the base station This should be done from time to time.

In setting the base station coverage parameter according to the prior art, the coverage radius of the base station is determined and the coverage parameter is set according to the skill of the operator.

Therefore, according to the skill level of the operator, the optimization level of the base station coverage may not be satisfied, and the optimization level of the base station coverage varies depending on the skill level of the operator.

Korean Patent Publication No. 2009-0117444, Disclosure Date November 12, 2009.

The present invention proposes a base station coverage determination method for determining a coverage cell radius of a base station using handoff position information collected through field measurement and base station location information acquired from a base station database Apparatus and method.

As a first aspect of the present invention, a base station coverage determination apparatus includes: a base station database storing location information of a base station; An information extracting unit for acquiring location information of a target base station from the base station database; And a plurality of handoff positions in which handoff is performed based on the plurality of handoff position information and the location information of the target base station, And a cell radius determination unit for determining a coverage cell radius of the target base station according to a distance between the selected longest distance handoff position and the target base station.

The cell radius correction unit may further include a cell radius correction unit for correcting the coverage cell radius by adding or subtracting the determined value of the coverage cell radius according to a base station operating environment.

And a coverage parameter determination unit that determines a coverage parameter according to the determined coverage cell radius.

According to a second aspect of the present invention, a base station coverage determination method includes: receiving a plurality of handoff position information on which a handoff has been performed; Obtaining location information of a target base station from a base station database; Selecting a handoff position that is the longest distance from the target base station among a plurality of handoff positions where handoff is performed with the target base station based on the plurality of handoff position information and the position information of the target base station; And determining a coverage cell radius of the target base station according to a distance between the handoff position and the target base station, which is the longest distance selected.

The method may further include correcting the coverage cell radius by adding or subtracting the determined value of the coverage cell radius according to a base station operating environment.

And determining a coverage parameter according to the determined coverage cell radius.

According to the embodiment of the present invention, the coverage cell radius and parameters of the base station can be determined using the handoff position information collected through the field measurement and the base station location information acquired from the base station database. In particular, since the handoff position information is collected through field measurements, the optimal coverage cell radius and parameters can be determined.

Therefore, since the setting of the base station coverage parameter does not depend on the skill level of the operator as in the prior art, the optimization level of the base station coverage is always kept constant and the efficiency is improved.

Furthermore, it is possible to suppress the occurrence of a call attempted in an abnormal coverage and connect a call to another base station, thereby reducing a setup fail and a call drop, thereby improving a call success rate.

1 is a block diagram of a base station coverage determination apparatus according to an embodiment of the present invention.
2 is a flowchart illustrating a method of determining a base station coverage according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a base station coverage determination apparatus according to an embodiment of the present invention.

As shown, the base station coverage determination apparatus 100 according to the embodiment includes a field measurement terminal 110, a base station database 120, an information extraction unit 130, a cell radius determination unit 140, a cell radius correction unit 150, a coverage parameter determination unit 160, an information provision unit 170, and the like.

The field measurement terminal 110 collects a plurality of handoff position information on which a handoff has been performed through field measurement. For example, the field measurement terminal 110 may collect propagation environment information and handoff position information while moving around the base station by the vehicle while being mounted on the field measurement vehicle.

Although the base station database 120 is shown as being included in the base station coverage determination apparatus 100 in FIG. 1, the base station database 120 may be separately operated in a form not included in the base station coverage determination apparatus 100. The base station database 120 stores base station position information, timing advance statistical information of a terminal random access preamble, and the like.

The information extracting unit 130 acquires the location information of the target base station and the timing advance statistical information of the terminal random access preamble from the base station database 120.

The cell radius determination unit 140 determines the cell radius based on the handoff position information collected by the field measurement terminal 110 and the position information of the target base station extracted by the information extraction unit 130, The handoff position is selected, and the coverage cell radius of the target base station is determined according to the distance between the selected longest handoff position and the target base station.

The cell radius correction unit 150 corrects the coverage cell radius by adding or subtracting the determined value of the coverage cell radius according to the base station operating environment. The cell radius modifying unit 150 may correct the coverage cell radius or verify the validity by using the timing advance statistical information extracted by the information extracting unit 130. [

The coverage parameter determination unit 160 determines the coverage parameter according to the determined coverage cell radius. The coverage parameter determination unit 160 determines a preamble format or a PRACH sequence parameter based on a pre-stored table, and determines a preambleInitialReceivedTargetPower value based on a pre-stored table. have.

The information providing unit 170 displays or outputs the information of the coverage parameter determined by the coverage parameter determining unit 160 to the outside to provide the corresponding information.

2 is a flowchart illustrating a method of determining a base station coverage according to an embodiment of the present invention.

As described above, the base station coverage determination method according to the embodiment includes a step (S210) of receiving a plurality of handoff position information on which handoff has been performed, a step S220 of acquiring location information of a target base station from a base station database A step (S230) of selecting a handoff position which is the longest distance from the target base station among a plurality of handoff positions where handoff has been performed with respect to the target base station, based on the plurality of handoff position information and the position information of the target base station A step S240 of determining a coverage cell radius of a target base station according to a distance between a handoff position and a target base station, which is a longest distance selected, and a step S240 of calculating a coverage cell radius according to a base station operating environment (S260) of determining a coverage parameter according to the determined coverage cell radius (S260), and determining Dispose a step (S270) for providing information parameter.

Hereinafter, a base station coverage determination process by the base station coverage determination apparatus according to an embodiment of the present invention will be described in more detail with reference to FIG. 1 and FIG.

First, the field measurement terminal 110 collects a plurality of handoff position information on which handoff has been performed through field measurement. For example, the field measurement terminal 110 can collect radio wave environment information and handoff position information while moving around the base station by the vehicle while being mounted on the field measurement vehicle (S210).

The information extracting unit 130 extracts and acquires the location information of the target base station and the timing advance statistical information of the terminal random access preamble from the base station database 120. In this case, when the base station operation environment information, that is, the coverage variation characteristic information according to whether the base station is installed in the urban area or the plain area, the dedicated line length information in the case where the repeater exists is stored in the base station database 120, (S220).

Then, the cell radius determining unit 140 determines whether the handoff is performed with respect to the target base station based on the handoff position information collected by the field measurement terminal 110 and the position information of the target base station extracted by the information extraction unit 130 A handoff position, which is the longest distance from the target base station, is selected among a plurality of handoff positions performed (S230), and the coverage cell radius of the target base station is determined according to the distance between the selected longest handoff position and the target base station. For example, the distance between the selected longest handoff position and the target base station may be determined as the coverage cell radius of the target base station (S240).

Next, the cell radius correction unit 150 corrects the coverage cell radius determined by the cell radius determination unit 140 according to the base station operating environment by adjusting the radius of the coverage cell (S250).

Here, the cell radius correction unit 150 may correct the coverage cell radius or verify the validity by using the timing advance statistical information extracted by the information extraction unit 130. [ For example, an LTE (Long Term Evolution) mobile communication system uses an Orthogonal Frequency Division Multiplexing (OFDM) scheme. Since mobile communication terminals are synchronized within the coverage of the same base station, The base station and the mobile communication terminal need to be synchronized to transmit / receive good data. However, if a delay occurs in the data to be exchanged due to the distance from the base station during the use of the specific time slot, a data error may occur due to overlapping with the data of the user using the next time slot and parameters used to compensate for such data error Is timing advance. Through this timing advance statistical information, it is possible to mainly estimate the distance at which the traffic occurs.

In addition, the coverage parameter determination unit 160 determines a coverage parameter according to the determined coverage cell radius (S260).

Here, the coverage parameter determiner 160 determines a preamble format or a PRACH ZC sequence parameter based on the pre-stored table as shown in Table 1 below.

Format Cyclic Prefix Sequence Subframes Guard Time Cell Radius 0 103.125 μs 800 One 96.875 μs ~ 14 km One 684.375 μs 800 2 515.625 μs ~ 75 km 2 206.25 μs * 1600 2 193.75 μs ~ 28 km 3 684.375 μs * 1600 3 715.625 μs ~ 103 km

For example, in the table of Table 1, a preamble format including the coverage cell radius (Cell Radius) determined by step S250 is determined. Here, the cyclic prefix may cause a frame to be shifted due to a multipath due to the use of multipath by the base station antenna and the mobile communication terminal. In order to distinguish the signals from each other even with such a time difference, .

PRACH configuration index Number of root sequences per cell Random access radius [km] One
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0 One
2
2
2
2
3
3
4
5
6
8
10
13
22
32
64 0.7
One
1.4
2
2.5
3.4
4.3
5.4
7.3
9.7
12.1
15.8
22.7
38.7
58.7
118.8

The PRACH configuration index and the number of root sequences per cell corresponding to the closest number in the table of Table 2 as compared with the cell radius determined in step S250 (Number).

In addition, the coverage parameter determination unit 160 may determine the preambleInitialReceivedTargetPower value based on the pre-stored table. After acquiring the PRACH configuration information, the mobile communication terminal calculates whether the mobile communication system of the base station or the like can match a target power level desired. A path loss is calculated with a downlink power level transmitted directly by the system and a power level directly received and the same path loss is applied or a predetermined weight is multiplied Or the like to determine whether the uplink reception level can be adjusted. Therefore, if the preambleInitialReceivedTargetPower is set to a high value (e.g., max -90dBm), the mobile communication terminal can determine that the mobile communication terminal can not calculate its own power and can not attempt to access the base station. The value of the appropriate preambleInitialReceivedTargetPower parameter can be optimized and used through a real measurement table made up of field measurements of coverage radius and corresponding values.

Next, the information providing unit 170 displays or outputs the information of the coverage parameter determined by the coverage parameter determining unit 160 to the user or the system operator so that the user or the system operator can recognize the information.

Each block of the block diagrams attached hereto and combinations of steps of the flowchart diagrams may be performed by computer program instructions. These computer program instructions may be loaded into a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus so that the instructions, which may be executed by a processor of a computer or other programmable data processing apparatus, And means for performing the functions described in each step are created. These computer program instructions may also be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement the functionality in a particular manner so that the computer usable or computer readable memory It is also possible for the instructions stored in the block diagram to produce a manufacturing item containing instruction means for performing the functions described in each block or flowchart of the block diagram. Computer program instructions may also be stored on a computer or other programmable data processing equipment so that a series of operating steps may be performed on a computer or other programmable data processing equipment to create a computer- It is also possible that the instructions that perform the processing equipment provide the steps for executing the functions described in each block of the block diagram and at each step of the flowchart.

Also, each block or each step may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function (s). It should also be noted that in some alternative embodiments, the functions mentioned in the blocks or steps may occur out of order. For example, two blocks or steps shown in succession may in fact be performed substantially concurrently, or the blocks or steps may sometimes be performed in reverse order according to the corresponding function.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

According to the embodiment of the present invention, the coverage cell radius and the coverage parameter of the base station can be automatically calculated and determined using the base station handoff information and the base station location information acquired from the base station database.

Therefore, it is possible to use the base station database to determine the cell radius of the base station and to set the coverage parameter for the base station.

100: base station coverage determination device 110: field measurement terminal
120: base station database 130: information extracting unit
140: cell radius determination unit 140: cell radius correction unit
160: Coverage parameter determination unit 170:

Claims (6)

A base station database storing location information of the base station;
An information extracting unit for acquiring location information of a target base station from the base station database; And
A plurality of handoff locations to which a handoff has been performed, and a handoff position of the target base station, the plurality of handoff locations being handed off based on the plurality of handoff position information and the location information of the target base station, And a cell radius determining unit for determining a coverage cell radius of the target base station according to a distance between the selected longest distance handoff position and the target base station. The method according to claim 1,
And a cell radius correction unit for correcting the coverage cell radius by adding or subtracting the determined value of the coverage cell radius according to a base station operating environment. 3. The method of claim 2,
And a coverage parameter determination unit that determines a coverage parameter according to the determined coverage cell radius. Receiving a plurality of handoff position information on which a handoff has been performed;
Obtaining location information of a target base station from a base station database;
Selecting a handoff position that is the longest distance from the target base station among a plurality of handoff positions where handoff is performed with the target base station based on the plurality of handoff position information and the position information of the target base station; And
And determining a coverage cell radius of the target base station according to a distance between the handoff position, which is the longest distance selected, and the target base station. 5. The method of claim 4,
And correcting the coverage cell radius by adding or subtracting the determined value of the coverage cell radius according to a base station operating environment. 6. The method of claim 5,
Determining a coverage parameter according to the determined coverage cell radius.

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