KR20140036891A - Method and apparstus for determining coverage of base station - Google Patents

Abstract

The present invention relates to a method and an apparatus for determining the coverage of a base station. The disclosed apparatus for determining the coverage of a base station comprises: a base station database in which hand-off information and location information on a base station are stored; an information extraction unit which obtains location information on a target base station and hand-off information on the target base station from the base station database; a temporary cell radius determination unit which divides base stations into hand-off execution base stations executing a hand-off process with the target base station and non hand-off execution base stations not executing the hand-off process with the target base station according to the hand-off information on the target base station, and temporarily determines a coverage cell radius by considering the distance between the target base station and a hand-off execution base station and the distance between the target base station and a non hand-off execution base station according to the location information on the target base station. Therefore, the optimal level of the coverage of a base station is always maintained regardless of worker skills, unlike existing technologies with which the setting of a base station coverage parameter is executed by relying on the skill of a worker. [Reference numerals] (110) Base station database; (120) Information extracting unit; (130) Temporary cell radius determination unit; (140) Cell radius determination unit; (150) Coverage parameter determination unit; (160) Information providing unit

Description

Base station coverage determination apparatus and method {METHOD AND APPARSTUS FOR DETERMINING COVERAGE OF BASE STATION}

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 base station handoff information and base station location information obtained from a base station database.

As is well known, a mobile communication system is a system that enables communication between mobile subscribers regardless of a subscriber's location by using spatial propagation, and transmits and receives a message and transmits a message with a mobile communication terminal moving in an unspecified area. There is a need for a plurality of base stations to manage, and these base stations have coverage to manage radio resources.

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

In addition, even after optimizing the coverage of the base station by setting the coverage parameter, if the coverage of neighboring base stations is continuously affected by the base station antenna adjustment and changes in surrounding buildings, the operation of setting the coverage parameter to determine the coverage radius of the base station is performed. It 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 for the base station is determined depending on the skill of the operator.

Therefore, there may occur a case where the optimization level of the base station coverage cannot be satisfied depending on the skill of the operator, and there is a problem that the optimization level of the base station coverage varies in accordance with the skill of the operator.

Korean Patent Publication No. 2009-0117444, published November 12, 2009.

The present invention has been proposed to solve the above problems of the prior art, and provides an apparatus and method for determining a base station coverage using a base station handoff information and base station location information obtained from a base station database. .

In accordance with a first aspect of the present invention, a base station coverage determining apparatus includes: a base station database in which handoff information and location information of a base station are stored, and information for obtaining handoff information of a target base station and position information of the target base station from the base station database; And a handoff base station performing handoff with the target base station according to the handoff information of the target base station and a non-handoff base station not performing handoff with the target base station. And a cell radius temporary determiner configured to temporarily determine a coverage cell radius in consideration of the distance between the target base station and the base station performing the handoff and the distance between the target base station and the non-handoff base station according to the location information.

The method may further include a cell radius determiner configured to determine the coverage cell radius by adding or subtracting the temporary determination value of the coverage cell radius along a base station operating environment.

The apparatus may further include a coverage parameter determiner that determines a coverage parameter according to the determined coverage cell radius.

The coverage cell radius temporarily determined by the cell radius temporary determiner may be greater than a distance between the target base station and the handoff performing base station and less than a distance between the target base station and the non-handoff base station.

According to a second aspect of the present invention, a method for determining a base station coverage includes obtaining handoff information of a target base station and location information of the target base station from a base station database, and according to the handoff information of the target base station, Distinguishing between a handoff performing base station performing an off and a non-handoff base station not performing a handoff between the target base station and the target base station and the handoff performing base station according to the location information of the target base station; And temporarily determining a coverage cell radius in consideration of the distance between the target base station and the distance between the target base station and the non-handoff base station.

Here, the temporarily determined coverage cell radius may be greater than a distance between the target base station and the handoff performing base station and less than a distance between the target base station and the non-handoff base station.

The method may further include determining the coverage cell radius by adding or subtracting the temporary determination value of the coverage cell radius along a base station operating environment.

The method may further include determining a coverage parameter of the target base station according to the determined coverage cell radius.

As a third aspect of the present invention, a method for determining a base station coverage includes a first base station group performing handoff with the target base station and a second base station group without performing handoff with the target base station among base stations around the target base station. Calculating a base station having a longest distance from the target base station among the first base station group, and a first distance between the longest distance base station and the target base station from the target base station among the second base station group; Calculating a shortest distance base station, and a second distance between the shortest distance base station and the target base station, and setting a coverage cell radius of the target base station to be greater than the first distance and less than the second distance. It may include a step.

According to an embodiment of the present invention, the coverage cell radius and parameters of the base station can be determined using the base station handoff information and the base station location information obtained from the base station database.

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

Furthermore, there is an effect of reducing setup failure and call drop by blocking the occurrence of an attempted call in abnormal coverage.

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 base station coverage determination method according to an embodiment of the present invention.
3 is a conceptual diagram for explaining a process of determining a base station cover saving cell radius according to an embodiment of the present invention.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail 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 described above, the base station coverage determining apparatus 100 according to the embodiment includes a base station database 110, an information extracting unit 120, a cell radius temporary determining unit 130, a cell radius determining unit 140, and coverage parameter determination. The unit 150, the information providing unit 160 and the like.

Although the base station database 110 is shown as being included in the base station coverage determination apparatus 100 in FIG. 1, the base station database 110 may be separately operated in a form not included in the base station coverage determination apparatus 100. The base station database 110 stores base station handoff information, base station location information, timing advance statistical information of a random access preamble of the terminal, and the like.

The information extracting unit 120 obtains the handoff information of the target base station, the position information of the target base station, and the timing advance statistics information of the terminal random access preamble from the base station database 110.

The cell radius temporary determiner 130 performs a handoff between the target base station and the target base station according to the base station handoff information extracted by the information extractor 120 and does not perform a handoff between the base station and the target base station. The base station is classified and the coverage cell radius is temporarily determined in consideration of the distance between the target base station and the handoff base station and the distance between the target base station and the non-handoff base station according to the location information of the target base station.

The cell radius determiner 140 determines the coverage cell radius by adding or subtracting a temporary determination value of the coverage cell radius along the base station operating environment. The cell radius determiner 140 may determine or validate the coverage cell radius using the timing advance statistical information extracted by the information extractor 120.

The coverage parameter determiner 150 determines the coverage parameter according to the determined coverage cell radius. The coverage parameter determiner 150 determines a preamble format or a Packet Random Access Channel Zadoff Chu (PRACH ZC) sequence parameter based on a pre-stored table, and determines a preambleInitialReceivedTargetPower value based on a pre-stored table. have.

The information providing unit 160 displays or outputs information on the coverage parameter determined by the coverage parameter determining unit 150 to provide the corresponding information.

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

As described above, the method for determining a base station coverage according to the embodiment may include obtaining handoff information of the target base station, location information of the target base station, and timing advance statistics information of the UE random access preamble from the base station database (S210). Performing a handoff with the target base station according to the handoff information of the base station Performing a handoff between the base station and the target base station without performing the handoff without performing the handoff, the base station and the target base station according to the location information of the target base station Temporarily determining the coverage cell radius in consideration of the distance from the off-performing base station and the distance between the target base station and the non-handoff base station (S220); Determining a cell radius (S230) and the determined coverage cell half The method may include determining a coverage parameter according to circumstances (S240) and providing information on the determined coverage parameter (S250).

Hereinafter, a process of determining base station coverage by the base station coverage determination apparatus according to an embodiment of the present invention will be described in more detail with reference to FIGS. 1 to 3.

First, the base station information extracting unit 120 extracts and obtains the handoff information of the target base station, the position information of the target base station, and the timing advance statistics information of the terminal random access preamble from the base station database 110 (S210).

Then, the cell radius temporary determiner 130 performs a handoff between the target base station and the target base station according to the base station handoff information extracted by the information extractor 120. The non-execution base station is classified to set a first base station group in which handoff is performed with the target base station and a second base station group in which handoff is not performed with the target base station.

The cell radius temporary determining unit 130 calculates the longest distance base station from the target base station and the first distance between the longest distance base station and the target base station among the first base station group and the shortest distance from the target base station among the second base station group. A second distance between the base station of the distance and the base station of the shortest distance and the target base station is calculated.

In addition, the cell radius temporary determiner 130 temporarily determines the coverage cell radius in consideration of the distance from the base station performing the handoff and the distance from the non-handoff base station according to the location information of the target base station. For example, the coverage cell radius of the target base station may be set to be larger than the first distance and smaller than the second distance.

As shown in FIG. 3, the handoff performing base stations 302, 303, 304, and 305 performing handoff are distinguished from the target base station 301 to determine the coverage cell radius, and the target base station 301. The handoff base stations 306, 307, and 308 that do not perform handoff are distinguished from the base station 305 that is farthest from the handoff base stations 302, 303, 304, and 305. The cell radius is temporarily determined in consideration of the distance l1 of and the distance l2 of the closest base station 306 among the non-handoff base stations 306, 307, and 308. For example, the temporary cell radius D may be determined through Equation 1 below (S220).

Subsequently, the cell radius determiner 140 determines the coverage cell radius by adding or subtracting a temporary determination value of the coverage cell radius determined by the cell radius temporary determiner 130 along the base station operating environment (S230).

Here, the cell radius determiner 140 may determine or validate the coverage cell radius using the timing advance statistical information extracted by the information extractor 120. For example, a Long Term Evolution (LTE) mobile communication system uses Orthogonal Frequency Division Multiplexing (OFDM), and any of a plurality of time slots is selected because the mobile communication terminals are synchronized within the coverage of the same base station. Whether used or not, the base station and the mobile communication terminal must be synchronized to exchange good data. However, if a delay occurs in the data sent and received due to the distance from the base station while using a specific time slot, a data error may occur by overlapping with the data of the user who uses the next time slot, and the parameter used to compensate for such data error. Is the timing advance. The timing advance statistical information can mainly estimate at what distance the traffic occurs.

In addition, the coverage parameter determiner 150 determines the coverage parameter according to the determined coverage cell radius (S240).

Herein, the coverage parameter determiner 150 determines a preamble format or a Packet Random Access Channel Zadoff Chu (PRACH ZC) sequence parameter based on a previously stored table as shown in Table 1 below.

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

For example, in the table of Table 1, a preamble format including a coverage cell radius (Cell Radius) determined by step S230 is determined. Here, the cyclic prefix (Cyclic Prefix) may be a frame deviated by the time difference caused by the multi-path as the base station antenna and the mobile communication terminal using the multi-path, so that even if the time difference can distinguish each signal Parameter.

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

In the table of Table 2, the number of the PRACH configuration index and the root sequence per cell corresponding to the closest number as compared with the coverage cell radius determined by step S230 is determined. Select (Number).

In addition, the coverage parameter determiner 150 may determine a preambleInitialReceivedTargetPower value based on a pre-stored table. After obtaining the PRACH configuration information, the mobile communication terminal calculates whether a mobile communication system such as a base station can meet a desired target power level. The path-loss is calculated using the downlink power level transmitted by the system and the directly received power level, and the same path loss is applied or multiplied by a constant weight. Calculate whether the uplink reception level can be adjusted by determining the like. Therefore, if the preambleInitialReceivedTargetPower is set to a high value (eg, max -90 dBm), the mobile communication terminal may determine that its power cannot be reached and may not attempt to access the corresponding base station. The appropriate preambleInitialReceivedTargetPower parameter value can be optimized by using the actual measurement table created by measuring the coverage radius and the field.

Next, the information provider 160 displays or outputs the information of the coverage parameter determined by the coverage parameter determiner 150 to the user or system operator to recognize the information (S250).

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 noted 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 an embodiment of the present invention, the coverage cell radius and coverage parameters of the base station can be automatically calculated and determined using the base station handoff information and the base station location information obtained from the base station database.

Therefore, the base station database may be used to determine the cell radius of the base station and to set the coverage parameters for the base station.

100: base station coverage determination device
110: base station database 120: information extraction unit
130: cell radius temporary determination unit 140: cell radius determination unit
150: coverage parameter determiner 160: information providing unit

Claims (9)

A base station database storing handoff information and location information of the base station;
An information extracting unit for obtaining handoff information of a target base station and position information of the target base station from the base station database;
According to the handoff information of the target base station, a handoff base station performing handoff with the target base station and a non-handoff base station not performing handoff with the target base station are distinguished. And a cell radius temporary determiner configured to temporarily determine a coverage cell radius in consideration of a distance between the target base station and the base station performing the handoff and a distance between the target base station and the non-handoff base station. The method of claim 1,
And a cell radius determiner configured to determine the coverage cell radius by adding or subtracting the temporary determination value of the coverage cell radius along a base station operating environment. 3. The method of claim 2,
And a coverage parameter determiner for determining a coverage parameter according to the determined coverage cell radius. The method of claim 1,
And a coverage cell radius temporarily determined by the cell radius temporary determiner is greater than a distance between the target base station and the handoff performing base station and less than a distance between the target base station and the non-handoff base station. Obtaining handoff information and location information of the target base station from the base station database;
Distinguishing a handoff base station performing handoff with the target base station and a non-handoff base station not performing handoff with the target base station according to the handoff information of the target base station;
And temporarily determining a coverage cell radius in consideration of the distance between the target base station and the base station performing the handoff and the distance between the target base station and the non-handoff base station according to the location information of the target base station. How to determine your coverage. The method of claim 5, wherein
And the temporarily determined coverage cell radius is greater than a distance between the target base station and the handoff performing base station and less than a distance between the target base station and the non-handoff base station. The method of claim 5, wherein
And determining the coverage cell radius by adding or subtracting the temporary determination value of the coverage cell radius along a base station operating environment. The method of claim 7, wherein
And determining a coverage parameter of the target base station according to the determined coverage cell radius. Setting, among the base stations around the target base station, a first base station group in which handoff is performed with the target base station and a second base station group in which handoff is not performed with the target base station;
Calculating a base station of the longest distance from the target base station among the first base station group, and a first distance between the longest base station and the target base station;
Calculating a base station of the shortest distance from the target base station among the second base station group, and a second distance between the shortest base station and the target base station;
And setting a coverage cell radius of the target base station to be greater than the first distance and less than the second distance.

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