KR20020072116A - Method for the Analysis Function of the Forward Link Coverage of Wireless Network with Repeaters in Radio Communication System - Google Patents

Abstract

PURPOSE: A method for analyzing a forward link coverage of a wireless network in which a repeater is included in a wireless communication system is provided to obtain an accurate performance analyzed result by analyzing the wireless network including the repeater as well as a base station. CONSTITUTION: A base station is selected(201), and a remote repeater which is shared with the base station is selected(202). A traffic about the selected base station and repeater is distributed as uniform, non-uniform, and density/sector(203). A path loss is analyzed(204), and a receiving signal intensity is analyzed(205). An interference, a signal to noise ratio(Ec/Io) of a pilot channel, and a soft hand-off are analyzed about each channel of the base station(206). An interference, a signal to noise ratio(Ec/Io) of a pilot channel, and a soft hand-off are analyzed about each channel of the repeater(207). A coverage about a forward link of a wireless network including the base station and the repeater is analyzed using the analyzed result about the base station and the repeater(208).

Description

Method for the Analysis Function of the Forward Link Coverage of Wireless Network with Repeaters in Radio Communication System}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wireless network performance analysis technology, and in particular, currently used wireless access network (WLL), broadband wireless subscriber network (B-WLL), frequency common communication network (TRS), and code division multiple access (CDMA) mobile communication network. , Repeaters in wireless communication systems such as personal mobile communication networks (PCS), intelligent transport networks (ITS), other mobile networks in foreign countries, and next generation mobile networks (IMT-2000), which are currently being standardized in North American and European ways. The present invention relates to a method for analyzing coverage of a forward link of an included wireless network and a computer-readable recording medium storing a program for realizing the method.

Explosive acceptance of subscribers since the start of commercially available digital cellular services (DCS) and personal communications services (PCS), as well as future wireless services such as wireless local loop (WLL) and international mobile telecommunication (IMT-2000) It is increasing.

When a wireless communication service provider wants to install a plurality of base stations in each area in order to ensure call quality, the mobile service provider performs cell planning to design a callable area that each base station can cover. In accordance with such cell planning, efforts will be made to improve call quality in the shadow area by expanding base stations, installing optical micro-cells, and adjusting hand-off parameters.

Typically, performance analysis for a wireless network in which a wireless communication service is performed is analyzed by a performance analysis simulator.

Performance analysis simulators for existing CDMA mobile phones and IMT-2000 wireless networks are typically capable of analyzing a wireless network composed of a general array of base stations. However, in a general wireless communication system, it is common to operate a wireless network using a repeater as well as a base station.

Therefore, in case of analysis of the wireless network including the repeater, the wireless network including the repeater should be analyzed.

However, the existing wireless network performance analysis simulator does not have a wireless network analysis function including a base station and a repeater has a problem that can not accurately analyze the performance of the wireless network.

The present invention has been proposed to solve the above problems, wireless network forward link coverage for improving the call quality by accurately analyzing the performance of the forward link coverage of a wireless network including a repeater in a wireless communication system It is an object of the present invention to provide a computer-readable recording medium recording an analysis method and a program for realizing the method.

1 is an exemplary configuration of a wireless network performance analysis system to which the present invention is applied.

2 is a flowchart illustrating a method for analyzing a forward link coverage of a wireless network including a repeater in a wireless communication system according to the present invention.

Figure 3 is an embodiment comparison for analysis of signal to noise ratio (Ec / Io) of the pilot channel in accordance with an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

110 measurement unit 120 analysis unit

130: geographic information system (GIS) 140: display unit

According to an aspect of the present invention, there is provided a method for forward link coverage analysis in a wireless communication system, the method comprising: selecting a base station and a repeater to be analyzed in a wireless network; A second step of distributing traffic for the selected base station and the repeater and analyzing path attenuation of the base station and the repeater; A third step of analyzing received signal strengths of the base station and the repeater based on the analyzed path attenuation values; And a fourth step of analyzing the coverage of the wireless network forward link for each channel of the base station and the repeater based on the analyzed received signal strength.

On the other hand, the present invention, a wireless network simulator having a high-capacity processor, a first function for selecting a base station and a repeater to be analyzed in the wireless network; A second function of distributing traffic to the selected base station and the repeater and analyzing path attenuation of the base station and the repeater; A third function of analyzing received signal strengths of the base station and the repeater based on the analyzed path attenuation values; A computer-readable recording medium having recorded thereon a program for realizing a fourth function of analyzing coverage of a wireless network forward link for each channel of the base station and repeater based on the analyzed received signal strength.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of a wireless network performance analysis system to which the present invention is applied.

In the figure, "110" represents a measurement unit, "120" represents an analysis unit, "130" represents a geographic information system (GIS), and "140" represents a display unit, respectively.

The measurement unit 110 collects a radio wave model, measurement data, traffic distribution, site information, and the like, and sends the collected information to the analysis unit 120.

The geographic information system (GIS) 130 provides location information of the base station to the analysis unit 120.

After performing the performance analysis in the analysis unit 120 using the information received from the measurement unit 110 and the geographic information system 120, through the display unit 140 can view the data on the wireless network performance analysis. Make sure

Among them, the coverage analysis for the forward link is determined by a certain threshold of the magnitude of the output transmitted from the base station and the repeater. The ratio of the noise to the signal of the pilot channel, that is, the "pilot Ec / Io" It is usually expressed as a value.

The coverage analysis for the forward link can be easily and accurately performed through the analysis result shown in the predetermined color.

2 is a flowchart illustrating a method of analyzing a forward link coverage of a wireless network including a repeater in a wireless communication system according to the present invention.

First, a repeater used in a forward link coverage analysis method of a wireless network including a repeater according to the present invention is a base station sector sharing type repeater having the same Pseudo Noise Offset value of a parent base station and a repeater.

In this case, various analysis results analyzed for the analysis target region may be displayed in a predetermined color according to the analysis result value.

As shown in FIG. 2, first, an analysis target base station is selected (201), and a remote repeater shared with the base station is selected (202).

Then, the traffic is distributed in uniform, non-uniform, density / sector and the like for the selected base station and the repeater (203). In this case, when distributing undivided traffic, the traffic is distributed using the coverage ratio between the base station and the repeater.

Next, path loss (Path Loss) is analyzed (204), the strength of the received signal is analyzed.

In order to determine the strength of the received signal in consideration of the repeater, first, the received signal strength when there is no repeater from the base station to the terminal is obtained.

The received signal strength in the absence of a repeater is as follows.

Received signal strength = ∑ {transmit power of base station + antenna gain-feeder loss-path loss of radio wave}

The received signal strength is performed at all base stations.

Next, the received signal strength of the repeater is obtained from the repeater to the terminal.

The received signal strength of the repeater is as follows.

Received Signal Strength = ∑ {Transmitter Power + Antenna Gain-Feeder Loss-Path Loss of Radio Wave}.

The received signal strength of the repeater is performed in all repeaters as in the base station.

The total received signal strength considering the repeater is obtained by adding the received signal strength in the absence of the repeater and the received signal strength of the repeater.

When the received signal strength is analyzed for the base station and the repeater, the interference, the signal-to-noise ratio (Ec / Io), soft handoff, etc. of the pilot channel are analyzed for each channel of the base station (206), and the repeater also analyzes each channel likewise. The interference, signal-to-noise ratio (Ec / Io), soft handoff, and the like of the pilot channel are analyzed (207). Here, the self-cell interference of the base station with the repeater is the sum of the "received signal strength of the own cell" and "received signal strength of the repeater", and the other cell interference is the "total received signal strength of the other cell" and "total of the other repeater It can be obtained as the sum of the received signal strength ". In addition, the signal-to-noise ratio (Ec / Io) and soft handoff of the pilot channel can be obtained using the results.

Subsequently, coverage analysis on the forward link of the wireless network including the base station and the repeater is performed using the results analyzed for the base station and the repeater (208).

Among them, the coverage analysis for the forward link is determined by a certain threshold of the magnitude of the output transmitted from the base station and the repeater. The ratio of the noise to the signal of the pilot channel, that is, the "pilot Ec / Io" It is usually expressed as a value.

The coverage analysis for the forward link can be easily and accurately performed through the analysis result shown in the predetermined color.

FIG. 3 is a comparison diagram of an example of analyzing a signal-to-noise ratio (Ec / Io) of a pilot channel according to an embodiment of the present invention. FIG.

In the figure, "310" is a display screen for the signal-to-noise ratio (Ec / Io) of the pilot channel in the wireless network without the repeater, "320" is the signal-to-noise ratio (Ec / Io) of the pilot channel in the wireless network including the repeater Display screen for Io).

As shown in FIG. 3, for performance analysis of the wireless network, it can be seen that the performance analysis 320 including the repeater is more accurate than the result 310 performed only with the analysis result for the base station.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

As described above, the present invention has an effect of deriving a more accurate performance analysis result by analyzing a wireless network including a base station as well as a repeater during wireless network performance analysis.

Claims (7)

In the forward link coverage analysis method in a wireless communication system, Selecting a base station and a repeater to be analyzed in a wireless network; A second step of distributing traffic for the selected base station and the repeater and analyzing path attenuation of the base station and the repeater; A third step of analyzing received signal strengths of the base station and the repeater based on the analyzed path attenuation values; A fourth step of analyzing coverage of a wireless network forward link for each channel of the base station and the repeater based on the analyzed received signal strength Forward link coverage analysis method comprising a. The method of claim 1, The traffic distribution process of the second step, And distributing the divided traffic for the base station and the repeater, and using the coverage ratio of the base station and the repeater when distributing the undivided traffic. The method according to claim 1 or 2, The third step, A fifth step of obtaining received signal strength when there is no repeater; Obtaining a received signal strength of the repeater; And A seventh step of adding the received signal strength in the absence of the repeater and the received signal strength of the repeater; Forward link coverage analysis method comprising a. The method of claim 3, wherein The repeater, A base station sector sharing type repeater, wherein the base station and the Pseude Noise Offset (Pseude Noise Offset) value, characterized in that the forward link coverage analysis method. The method of claim 4, wherein In the wireless network forward link coverage analysis of the fourth step, A method of forward coverage analysis, which is determined by a predetermined threshold value for the magnitude of an output transmitted from a base station and a repeater, and expressed as a value of a signal-to-noise ratio (Ec / Io) of a pilot channel. The method of claim 4, wherein The base station, The magnetic cell interference of the base station with the repeater is the sum of the received signal strength of the cell and the received signal strength of the repeater, and the other cell interference is the sum of the total received signal strength of the other cell and the total received signal strength of the other repeater. Forward coverage analysis method. In a wireless network simulator with a large processor, A first function of selecting a base station and a repeater to be analyzed in a wireless network; A second function of distributing traffic to the selected base station and the repeater and analyzing path attenuation of the base station and the repeater; A third function of analyzing received signal strengths of the base station and the repeater based on the analyzed path attenuation values; A fourth function of analyzing coverage of a wireless network forward link for each channel of the base station and repeater based on the analyzed received signal strength A computer-readable recording medium having recorded thereon a program for realizing this.