KR100219283B1 - Apparatus for estimating maximum communication capacity in cdma bs system - Google Patents

Abstract

The present invention relates to a method for measuring the maximum call capacity of a CDMA base station system suitable for measuring the performance and the maximum number of subscribers in a base station system wireless environment.

The present invention includes a first step of setting a noise attenuator to zero in a state where the base station processor sets information bits and noise density, and storing the received power value change, the magnetic gain control value, and the received signal strength value in EPI; A second step of turning on the power of the mobile terminal to make an operating state and comparing an amount of change in the automatic gain control value and the received signal strength value in the high frequency processor; Calculating a receivable power and noise power around the base station by adding an automatic gain control value and a power corresponding to a received signal strength value to power multiplied by the number of users; Fix the information and noise density and increase the level of the attenuator to convert the attenuation value until the information bit and noise density value falls below the fixed value to power and divide the received power to divide the maximum possible capacity of the user. The fourth process of calculation is performed sequentially.

Description

Maximum call capacity measurement method of CDMA base station system

1 is a block diagram of a call capacity measuring apparatus of a conventional CDMA base station system.

2 is a block diagram of an apparatus for measuring a maximum call capacity of a CDMA base station system according to the present invention.

3 is a waveform diagram of a signal for measuring call capacity in the present invention.

4 is a flowchart illustrating a process of measuring a maximum call capacity of a CDMA base station system according to the present invention.

* Explanation of symbols for main parts of the drawings

4: down conversion card 7: high frequency processor

10 digital channel processor 11 base station processor

12 controller 12b base station test processor

The present invention relates to the measurement of the maximum call capacity of the CDMA base station system, and more particularly to a method of measuring the maximum call capacity of the CDMA base station system adapted to measure the performance and the maximum number of subscribers of the base station system wireless environment.

In general, a method for measuring the subscriber capacity of a base station in a CDMA system is to measure the subscriber capacity of the base station by adjusting the amount of noise on the noise shelf installed in the CDMA base station system manufactured by Qualcomm. There is a way.

The conventional system for measuring subscriber talk capacity of such a CDMA base station is shown in FIG.

As shown, the antenna 1, the band pass filter 2, the low noise amplifier 3, the down conversion card 4, the noise attenuator 5, the noise shelf 6, and the high frequency processor 7 ), An analog common card (8), a channel card (9), a digital channel processor (10), and a base station processor (11).

The operation of the call capacity measuring apparatus of the conventional CDMA base station system configured as described above is as follows.

First, the initial automatic gain control (AGC) value and the receive signal strength indicator (RSSI) value of the down conversion card 4 without noise added while the high frequency process 7 is initialized are prepared as a table. Then, the noise attenuator 5 is adjusted to add noise to the down conversion card 4.

The down conversion card 4 has two paths, a signal path and a path through which a signal and noise are mixed, and adds noise to one path to obtain AGC and RSSI values of the signal path and a path where the signal and noise are mixed. Create a noise correction table at the beginning and compare the AGC and RSSI values of the signal path and the mixed signal and noise path during base station installation operation, and measure the user capacity of the base station while increasing the user and noise. .

In this case, some assumptions are made as follows.

That is, firstly, it is assumed that the user used in another base station is not affected, and secondly, it is assumed that there is no noise acting in the environment of the base station.

However, the call capacity measurement of the conventional CDMA base station system has a large difference in time and day due to the influence of the traffic volume, the means of transportation, and the pressure of the neighboring base station. There was a problem with many errors.

Therefore, the present invention has been proposed to solve the above problems in measuring the call capacity of the conventional CDMA base station system as described above, and an object of the present invention is to make the CDMA suitable for measuring the performance and the maximum number of subscribers in the base station system wireless environment. It is to provide a method for measuring the maximum call capacity of the base station system.

In order to achieve the object of the present invention, the base station processor sets the noise attenuator to zero while setting the information bits and the noise density, and changes the received power value change, the automatic gain control value, and the received signal strength value to the IPROM. A first process of storing; A second step of turning on the power of the mobile terminal after the first step to bring the mobile terminal into an operating state and comparing an amount of change in the automatic gain control value and the received signal strength value in the high frequency processor; A third step of calculating a receivable power and a noise power around the base station by adding an automatic gain control value and a power corresponding to a received signal strength value to power multiplied by the number of changes after the second step; Fix the information bit and noise density and increase the level of the attenuator to convert the attenuation value until the information bit and noise density value falls below the fixed value to power and divide by the received power to maximize the user's maximum possible capacity. The fourth step is to calculate.

Hereinafter, described in detail with reference to the accompanying drawings of the present invention.

2 is a block diagram of an apparatus for measuring call capacity of a CDMA base station system according to the present invention.

As in the prior art, the antenna 1, the bandpass filter 2, the low noise amplifier 3, the downconversion card 4, the high frequency processor (), the analog common card 8, and the channel card 9 And a controller 12 comprising a digital channel processor 10, a base station processor 11, and a mobile station 12a and a base station test controller 12b capable of receiving data from a terminal and reporting the data to a higher processor. It was provided and configured.

Referring to FIG. 3 and FIG. 4 attached to the call capacity measuring method according to the present invention with reference to the call capacity measuring apparatus of the CDMA base station system according to the present invention configured as described above are as follows.

First, the digital channel processor 10 can know the number of subscribers and the information bits (Eb) / noise density (No), and the high frequency processor (7) automatically controls the reception power of the down conversion card (4). There should be a port for analog / digital conversion of received signal strength (RSSI), and it can be used as a third down in serial EPIROM that stores AGC and RSSI values according to the received power of down conversion card (4). The characteristic curve of the conversion card 4 should be read.

Here, the DNC characteristic curve as shown in FIG. 3 sets the attenuator to 0, and stores the received power value change amount, AGC, and RSSI value in YPIROM of the down conversion card 4 to store board-specific characteristics of the down conversion card.

The high frequency processor 7 may adjust the attenuation of the received signal by controlling the attenuator of the down conversion card 4, and the base station test processor 12b interfaces with the mobile terminal MS to transmit power transmitted from the terminal as data. Can read, specify the operating frequency of the terminal and connect the sector (SECTOR).

In addition, the base station processor 11 knows the number of users currently in use from the digital channel processor 10, and reads the AGC and RSSI of the reception power currently in use from the high frequency processor 7, and then through the base station test processor 12b. After the power is turned on to the operating state, the high frequency processor 7 compares the amount of change in the AGC and RSSI values of the down conversion card 4.

The power corresponding to the AGC and RSSI values is added to the power multiplied by the number of users from the digital channel processor 11, and the remaining power is the noise power around the base station.

The information bit / noise density of the digital channel processor 10 is fixed, and the attenuation value of the down conversion card 4 is increased, and the attenuation value until the information bit / noise density value falls below the fixed value is converted into electric power. The maximum possible capacity of the base station user is measured by dividing by the received power of the mobile terminal.

As described above, the present invention can achieve the optimization of the base station system according to the wireless environment and has the effect of designing a system suitable for the surrounding environment of the base station.

Claims (1)

A first step of setting a noise attenuator to zero with the base station processor setting information bits and noise density, and storing received power value variation, automatic gain control value, and received signal strength value in IPROM; A second process of turning on the power of the mobile terminal after the first process to make an operating state and comparing an amount of change of the automatic gain control value and the received signal strength value in a high frequency processor; A third step of calculating a receivable power and a noise power around a base station by adding an automatic gain control value and a power corresponding to a received signal strength value to power multiplied by the number of changes after the second step; Fix the information bit and noise density and increase the level of the attenuator to convert the attenuation value until the information bit and noise density value falls below the fixed value to power and divide by the received power to maximize the user's maximum possible capacity. Method for measuring the maximum call capacity of the CDA (CDMA) base station system, characterized in that consisting of a fourth process of calculating.