KR101883441B1 - Method and apparatus 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 handover information and location information of a base station, an information extracting unit for obtaining handover information of a target base station and location information of a target base station from the base station database, A handoff-performing base station for performing a handoff with a target base station and a handoff-less base station for performing a handoff between the target base station and a target base station are distinguished from each other. And a cell radius temporary decision unit for temporarily determining the coverage cell radius in consideration of the distance between the target base station and the base station not performing handoff. 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

Field of the Invention [0001] The present invention relates to a method and apparatus for determining base station coverage,

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 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 propagation, and is a system for transmitting and receiving a message with 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 apparatus and method for determining a coverage cell radius of a base station using base station handoff information and base station location information acquired from a base station database .

According to a first aspect of the present invention, there is provided a base station coverage determination apparatus comprising: a base station database storing handover information and position information of a base station; information extracting means for obtaining handover information of a target base station and positional information of the target base station, And a handoff-performing base station for performing a handoff with the target base station according to the handoff information of the target base station and a handoff-less performing base station not performing a handoff with the target base station, And a cell radius temporary decision unit for temporarily determining a coverage cell radius based on a distance between the target base station and the handoff performing base station and a distance between the target base station and the handoff non-performing base station according to location information.

The cell radius determining unit may further include a cell radius determining unit for determining the coverage cell radius by adding or subtracting a provisional determination 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.

The radius of the coverage cell determined by the cell radius temporary decision unit may be larger than the distance between the target base station and the handoff performing base station and smaller than the distance between the target base station and the handoff non-performing base station.

According to a second aspect of the present invention, there is provided a base station coverage determination method comprising: acquiring handoff information of a target base station and location information of the target base station from a base station database; Off of a handoff-performing base station and a handoff-performing base station that are not performing a handoff between the handover-performing base station and the handover-performing base station, according to location information of the target base station; And a step of temporarily determining a coverage cell radius based on a distance between the target base station and the handoff non-serving base station.

Here, the radius of the coverage cell temporarily determined may be larger than the distance between the target base station and the handoff performing base station, and may be smaller than the distance between the target base station and the handoff non-performing base station.

And determining the coverage cell radius by adding or subtracting the provisional determination value of the coverage cell radius according to the base station operating environment.

And determining a coverage parameter of the target base station according to the determined coverage cell radius.

According to a third aspect of the present invention, there is provided a method for determining a base station coverage, comprising: a first base station group in which a handoff is performed with respect to a target base station, and a second base station group in which a hand- Calculating a first distance between the base station having the longest distance from the target base station and the base station and the target base station among the first base station group and the longest distance from the target base station among the second base station group; Calculating a second distance between the shortest distance base station and the shortest distance base station and the target base station; setting a coverage cell radius of the target base station to be larger than the first distance and smaller than the second distance Step < / RTI >

According to the 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 acquired from the base station database.

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.

Further, there is an effect of reducing the setup fail and call drop by blocking the occurrence of the call attempted in the 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 method of determining a base station coverage according to an embodiment of the present invention.
3 is a conceptual diagram for explaining a process of determining a base station coverage cell radius 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 includes a base station database 110, an information extraction unit 120, a cell radius provisional determination unit 130, a cell radius determination unit 140, a coverage parameter determination A part 150, an information providing part 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, and timing advance statistical information of a random access preamble.

The information extracting unit 120 acquires the handoff information of the target base station, 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 110.

The cell radius temporary decision unit 130 performs a handoff not performing a handoff between the handoff performing base station performing the handoff with the target base station and the target base station according to the base station handoff information extracted by the information extracting unit 120 And determines the coverage cell radius based on the distance between the target base station and the handoff performing base station and the distance between the target base station and the handoff non-performing base station according to the location information of the target base station.

The cell radius determination unit 140 determines the coverage cell radius by adding or subtracting the provisional determination value of the coverage cell radius according to the base station operating environment. The cell radius determination unit 140 can confirm the validity of the coverage cell radius or verify the coverage cell radius using the timing advance statistical information extracted by the information extraction unit 120.

The coverage parameter determination unit 150 determines the coverage parameter according to the determined coverage cell radius. The coverage parameter determination unit 150 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 160 externally displays or outputs the information of the coverage parameter determined by the coverage parameter determining unit 150 and provides 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 shown in the figure, the base station coverage determination method according to the embodiment includes a step S210 of obtaining handoff information of a target base station, location information of a target base station, and timing advance statistical information of a terminal random access preamble from a base station database, A handoff-performing base station performing a handoff with a target base station according to handoff information of a base station and a handoff-less base station not performing a handoff with the target base station are distinguished from each other, A step S220 of temporarily determining a coverage cell radius based on a distance between the target base station and a target base station and a distance between the target base station and a base station not performing handoff, A step S230 of determining a cell radius, A step S240 of determining a coverage parameter according to the size of the area, and a step S250 of providing information on the determined coverage 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 to FIG.

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

Then, the cell radius temporary decision unit 130 decides a handoff-free base station which performs a handoff with the target base station according to the base station handoff information extracted by the information extraction unit 120 and a handoff- And sets a second base station group in which handoff is not performed between the first base station group and the target base station in which the handoff is performed.

The cell radius temporary decision unit 130 calculates the first distance between the base station having the longest distance from the target base station and the base station and the target base station among the first base station group and the shortest distance from the target base station And a second distance between the shortest distance base station and the target base station.

In addition, the cell radius temporary decision unit 130 temporarily determines the coverage cell radius in consideration of the distance to the handoff-performing base station and the distance from the base station not performing the handoff according to the location information of the target base station. For example, the coverage cell radius of the target base station can be set to be larger than the first distance and smaller than the second distance.

303, 304, and 305 that perform handoff with the target base station 301 for which the coverage cell radius is to be determined as shown in FIG. 3, 307 that do not perform handoff between the base stations 305, 306, 307, and 308 that are not performing handoff between the handoff-performing base stations 302, 303, 304, The cell radius is temporarily determined in consideration of the distance l1 between the distance ll of the base stations 306 to 308 and the closest base station 306 among the handoff-less basestations 306, 307 and 308. [ For example, the temporary cell radius D may be determined through Equation 1 below (S220).

Next, the cell radius determining unit 140 determines the coverage cell radius by adding or subtracting the provisional determination value of the coverage cell radius determined by the cell radius provisional determination unit 130 according to the base station operating environment (S230).

Here, the cell radius determination unit 140 can confirm the validity of the coverage cell radius or verify the coverage cell radius using the timing advance statistical information extracted by the information extraction unit 120. 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 150 determines a coverage parameter according to the determined coverage cell radius (S240).

Here, the coverage parameter determiner 150 determines a preamble format or a PRACH ZC (Packet Random Access Channel Zadoff Chu) sequence parameter based on a pre-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 the coverage cell radius (Cell Radius) determined by step S230 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 the root sequence per cell corresponding to the closest number in the table of Table 2 as compared with the cell radius determined in step S230 (Number).

In addition, the coverage parameter determination unit 150 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 160 displays or outputs the information of the coverage parameter determined by the coverage parameter determining unit 150 to the user or the system operator so that the information can be recognized by the user or the system operator in operation 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 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: base station database 120: information extracting unit
130: cell radius temporary decision unit 140: cell radius determination unit
150: Coverage parameter determining unit 160: Information providing unit

Claims (9)

A base station database in which handoff information and location information of a base station are stored,
An information extracting unit for obtaining handoff information of a target base station and positional information of the target base station from the base station database;
Sets a first base station group that performs a handoff with the target base station according to the handoff information of the target base station and a second base station group that does not perform a handoff with the target base station, Calculating a first distance between a base station having the longest distance from the base station and the target base station and calculating a second distance between the base station having the shortest distance from the target base station and the target base station among the second base station group, And a cell radius temporary determining unit for temporarily determining a coverage cell radius based on the second distance. The method according to claim 1,
And a cell radius determination unit for determining the coverage cell radius by adding or subtracting a provisional determination 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. A base station database in which handoff information and location information of a base station are stored,
An information extracting unit for obtaining handoff information of a target base station and positional information of the target base station from the base station database;
A handoff-performing base station for performing a handoff with the target base station according to the handoff information of the target base station, and a handoff-less performing base station not performing handoff with the target base station, And a cell radius temporary decision unit for temporarily determining a coverage cell radius in consideration of a distance between the target base station and the handoff performing base station and a distance between the target base station and the handoff non-performing base station,
Wherein the coverage radius of the cell radius temporarily determined by the cell radius provisional determination unit is larger than a distance between the target base station and the handoff performing base station and smaller than a distance between the target base station and the handoff non- Obtaining handoff information of a target base station and positional information of the target base station from a base station database;
Setting a first base station group for performing a handoff with the target base station and a second base station group not performing a handoff with the target base station according to the handoff information of the target base station;
Calculating a first distance between a base station having the longest distance from the target base station and the target base station among the first base station group and calculating a first distance between the base station having the shortest distance from the target base station and the target base station, ,
And temporarily determining a coverage cell radius based on the first distance and the second distance. Obtaining handoff information of a target base station and positional information of the target base station from a base station database;
Performing a handoff with the target base station according to the handoff information of the target base station and a handoff non-performing base station that does not perform a handoff with the target base station;
And temporarily determining a coverage cell radius based on a distance between the target base station and the handoff performing base station and a distance between the target base station and the handoff non-performing base station according to the location information of the target base station,
Wherein the provisionally determined coverage cell radius is larger than a distance between the target base station and the handoff performing base station and smaller than a distance between the target base station and the handoff non-performing base station. The method according to claim 6,
Further comprising the step of determining the coverage cell radius by adding or subtracting a provisional determination value of the coverage cell radius according to a base station operating environment. 8. The method of claim 7,
And determining a coverage parameter of the target base station according to the determined coverage cell radius. Setting a first base station group in which a handoff is performed with the target base station and a second base station group in which handoff is not performed with respect to the target base station among the base stations around the target base station;
Calculating a first distance between the base station having the longest distance from the target base station and the longest base station and the target base station among the first base station group,
Calculating a second distance between the base station of the shortest distance from the target base station and the shortest distance base station and the target base station among the second base station group,
And setting a coverage cell radius of the target base station to be larger than the first distance and smaller than the second distance.

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