KR100340026B1 - Apparatus and method of frequency reuse efficiency measurement - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to an apparatus for measuring frequency reuse efficiency and a method thereof and a computer-readable recording medium having recorded thereon a program for realizing the method.

2. The technical problem to be solved by the invention

According to the present invention, frequency reuse efficiency measurement is performed to quantitatively measure frequency reuse efficiency of a corresponding sector using data obtained from traffic channel elements (TCE) of a base station channel card and data obtained from reverse reception power. An object of the present invention is to provide a computer-readable recording medium having a device and a method thereof and a program for realizing the method.

3. Summary of Solution to Invention

The present invention provides a frequency reuse efficiency measuring apparatus comprising: amplifying means for amplifying a signal received from a base station; Downconverting means for downconverting the received signal transmitted through the amplifying means into an intermediate frequency signal; Demodulation means for demodulating the intermediate frequency signal transmitted from said downconversion means; Call processing means for processing a value for data generated in the base station according to the signal transmitted through the demodulation means; The total power value received through the sector of the amplifying means, the data per bit for the total interference signal density transmitted from the demodulation means assigned to the sector and the traffic channel assigned to the sector from the call processing means. Measuring means for collecting / processing data on the number of elements to measure frequency reuse efficiency of the corresponding sector; Communication connection means for connecting a signal transmitted through the call processing means and the measurement means to a communication network; And control means for monitoring and controlling the state of the base station according to the signal transmitted through the communication connection means.

4. Important uses of the invention

The present invention is used in the frequency reuse efficiency measuring apparatus.

Description

Apparatus and method of frequency reuse efficiency measurement

The present invention relates to an apparatus for measuring frequency reuse efficiency in a code division multiple access (CDMA) mobile communication system, a method thereof, and a computer-readable recording medium having recorded thereon a program for realizing the method. In particular, the frequency reuse efficiency measuring apparatus and method for quantitatively measuring the frequency reuse efficiency of the sector, considering that the capacity and quality of service for the reverse radio link of the base station depends on the amount of interference received from other mobile stations. And a computer readable recording medium having recorded thereon a program for realizing the method.

In general, mobile service providers have made great efforts to service the largest subscribers using limited radio resources. To this end, mobile communication service providers have conducted many studies on base stations that optimally manage the radio link characteristics of each cell. However, until now, only the influence on the forward direction has been considered in determining the effective location and service radius of the base station.

That is, in order to predict the distribution of subscribers in the expected service area and to provide appropriate coverage of the base station, much efforts have been made to select the base station location and adjust the base station output accordingly. As a result of this effort, a lot of know-how has been accumulated for the technology of managing the call quality of the base station's forward radio link. However, considering that the capacity of the CDMA mobile communication system is limited according to the amount of user interference in the reverse direction, the reverse direction optimization should be performed in addition to the forward optimization.

Currently, quality measurement of the base station's reverse radio link is made depending on the arbitrary know-how of RF (Radio Frequency) engineers who monitor the transmission output of the terminal and determine the state of the entire reverse radio link of the base station. However, this method is largely subjective and inadequate as a universal measurement method. In addition, although many studies have been conducted on the measurement device for the frequency reuse efficiency in the AMPS (Advanced Mobile Phone System), which is an analog wireless mobile communication method, a technical study on the CDMA method in which multiple subscribers share the same frequency channel is common. It is not enough.

Therefore, it is necessary to monitor the total reception power of the base station to quantitatively measure the load of the base station, and in particular, to measure the ratio (frequency reuse efficiency) of the total reception power of the signal received from the mobile stations in the cell. It is required.

The present invention has been devised to meet the above requirements, and reuses the frequency of a corresponding sector using data obtained from traffic channel elements (TCE) of the base station channel card and data obtained from reverse reception power. It is an object of the present invention to provide an apparatus and method for measuring frequency reuse efficiency capable of quantitatively measuring efficiency and a computer-readable recording medium having recorded thereon a program for realizing the method.

1 is an exemplary configuration example of a frequency reuse efficiency measuring apparatus according to the present invention.

2 is a flowchart illustrating an embodiment of a method for measuring frequency reuse efficiency according to the present invention;

* Explanation of symbols for the main parts of the drawings

11: low noise amplifier 12: down converter

13: Traffic Channel Element (TCE) 14: Base Station Processor (BSP)

15: frequency reuse efficiency measuring unit 16: communication connection

17: operation maintenance unit

In order to achieve the above object, the present invention provides a frequency reuse efficiency measuring apparatus comprising: amplifying means for amplifying a signal received from a base station; Downconverting means for downconverting the received signal transmitted through the amplifying means into an intermediate frequency signal; Demodulation means for demodulating the intermediate frequency signal transmitted from said downconversion means; Call processing means for processing a value for data generated in the base station according to the signal transmitted through the demodulation means; The total power value received through the sector of the amplifying means, the data per bit for the total interference signal density transmitted from the demodulation means assigned to the sector and the traffic channel assigned to the sector from the call processing means. Measuring means for collecting / processing data on the number of elements to measure frequency reuse efficiency of the corresponding sector; Communication connection means for connecting a signal transmitted through the call processing means and the measurement means to a communication network; And control means for monitoring and controlling the state of the base station according to the signal transmitted through the communication connection means.

In addition, the present invention, in the frequency reuse efficiency measuring method applied to the frequency reuse efficiency measuring apparatus, by measuring the power level using the signal received by the base station cell due to the mobile stations in all cells including the magnetic cell of the sector A first step of measuring a loading value X; Mobile stations in a cell by collecting data on the frequency of the traffic channel element data that is currently occupied and used in any frequency (FA) and in any sector and the total interfering signal density of the signal demodulated in each traffic channel element. Measuring the cell loading value X _M due to the second step; And a frequency reuse efficiency value F is determined by using the cell loading value X due to the mobile stations in all cells including the magnetic cell of the corresponding sector and the cell loading value X _M due to the mobile stations in the cell. Characterized in that it comprises a third step of measuring with a period of. The present invention may further include a fourth step of statistically processing the frequency reuse efficiency value F measured at the predetermined period for a predetermined time and measuring the frequency reuse efficiency value again as a probabilistic value.

In addition, the present invention, in the frequency reuse efficiency measuring apparatus having a processor, the cell loading value (X) due to the mobile stations in all cells including the magnetic cell of the sector by measuring the power level by using the signal received from the base station A first function of measuring; Mobile stations in a cell by collecting data on the frequency of the traffic channel element data that is currently occupied and used in any frequency (FA) and in any sector and the total interfering signal density of the signal demodulated in each traffic channel element. A second function of measuring a cell loading value X _M due to; And a frequency reuse efficiency value F is determined by using the cell loading value X due to the mobile stations in all cells including the magnetic cell of the corresponding sector and the cell loading value X _M due to the mobile stations in the cell. A computer readable recording medium having recorded thereon a program for realizing a third function of measuring at a period of time is provided. In addition, the present invention can be read by a computer recording a program for further realizing a fourth function of statistically processing the frequency reuse efficiency value F measured at the predetermined period for a predetermined time and measuring it back to a probabilistic value. Provide a recording medium.

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.

The application and evolutionary direction of the present invention is possible in various ways in various aspects. Although it is possible to implement in the form of a portable measuring equipment for measuring the frequency reuse efficiency as shown in Figure 1 to be described later, it may be implemented by implementing in the form of a card having such a function in the base station. Similarly, it is possible to provide the operator with only the results of a single sector of interest, but it can be applied to all sectors of all base stations and monitored and controlled by the central monitoring unit at the network management level. Therefore, the frequency reuse efficiency obtained according to the present invention can be applied to capacity calculation.

1 is a configuration example of an embodiment of a frequency reuse efficiency measuring apparatus according to the present invention.

As shown in FIG. 1, the apparatus for measuring frequency reuse efficiency according to the present invention includes a low noise amplifier 11 for amplifying a signal received through an antenna of a base station, and a received signal transmitted through the low noise amplifier 11. Demodulated through a downconverter 12 for downconverting to a frequency signal, a traffic channel element (TCE) 13 for demodulating an intermediate frequency signal transmitted from the downconverter 12, and a traffic channel element 13 A base station processor (BSP) 14 for processing values for data generated at the base station according to the signal, the total power value received through the corresponding sector of the low noise amplifier 11, and the traffic channel elements assigned to that sector ( 13) El traffic channels allocated to the corresponding sector from the data and the base station processor 14 to the _{E b / (N 0 + I} O) ( energy per bit to the total interference density signal) transmitted from the Lehman A communication network transmits signals transmitted through the frequency reuse efficiency measuring unit 15 and the base station processor 14 and the frequency reuse efficiency measuring unit 15 to collect and process data about a number to measure frequency reuse efficiency of a corresponding sector. Communication connection unit 16 for connecting to the control unit, and the operation maintenance unit 17 for monitoring the state of the base station according to the signal transmitted through the communication connection unit 16 to collect statistical data and control the base station.

Here, the base station processor 14 is a call processing processor of the base station, which is the number of traffic channel elements currently occupied and used in any frequency allocation (FA) and any sector and the signals demodulated from each traffic channel element unit 13. The function of E _b / (N ₀ + I _O ) and the like to exchange the frequency reuse efficiency measuring unit 15.

2 is a flowchart illustrating a method for measuring frequency reuse efficiency according to the present invention.

As shown in FIG. 2, in order to measure the frequency reuse efficiency, the power level is measured using a signal transmitted through the reception antenna of the base station and the low noise amplifier 11 (201), and all cells including the magnetic cell of the corresponding sector. The cell loading value X due to mobile stations in the cell is measured (202). In addition, the signal received via the antenna of the base station is converted to an intermediate frequency through amplification and conversion, and the demodulated signal is transmitted to the base station processor 14, which is present in any frequency (Frequency Allocation) and any sector. Traffic channel element data occupied and used and data on energy per bit (E _b / (N ₀ + I _O )) for the total interference signal density of the signal demodulated in each traffic channel element 13 are collected (203,204). Measure the cell loading value (X _M ) due to mobile stations in the cell (205).

Then, using the cell loading value X due to the mobile stations in all the cells including the magnetic cells of the sector and the cell loading value X _M due to the mobile stations in the cell, the frequency reuse efficiency value F is set to 1.25 msec. Periodic measurement (206), and the frequency reuse efficiency value (F) measured at a period of 1.25msec is measured again as a probabilistic value through statistical processing for a predetermined time (207).

In the method for measuring the frequency reuse efficiency value (F) according to the present invention, a reverse path of a base station in a CDMA system includes a primary path and a diversity path. Accordingly, if the total received power of the corresponding path is C, the definition of Z (the relative magnitude of the received power C with respect to the background noise) is given by Equation 1 below.

Where R is the data rate, W is the chip rate, E _bi is the bit power of the mobile station i, N ₀ is the background noise power density, I ₀ is the other mobile station interference power density, and M is the Number of service mobile stations, v _i is the voice activity coefficient of mobile station i, f is the fraction of other-cell interference with respect to in-cell interference generated in an equally loaded network).

In the above Equation 1, the cell loading value X _M due to the mobile stations in the cell is shown in Equation 2 below.

On the other hand, the frequency reuse efficiency F is defined as in Equation 3 below.

In Equation 3, X is cell loading due to mobile stations in all cells including magnetic cells of the corresponding sector. The frequency reuse efficiency F is a value given from the X _M value and the X value as shown in Equation 3 above.

Next, a method for obtaining a frequency reuse efficiency value (F) by measuring a cell loading value (X _M ) due to mobile stations in a cell and a cell loading value (X) due to mobile stations in all cells including a magnetic cell of a corresponding sector. to be.

First, the method of measuring the X _M value is as follows.

First, the data of all traffic channel elements 13 assigned to the corresponding sector of the base station is sent to the base station processor 14, which may be sent directly to the frequency reuse efficiency measurement unit 15.

Secondly, the base station processor 14 sends the data about the number of traffic channel elements allocated to the sector together with the data from the traffic channel element 13 to the frequency reuse efficiency measurement unit 15.

Third, the frequency reuse efficiency measuring unit 15 measures the X _M value using the provided data as defined in Equation 2 above.

That is, it can receive 800 E _bi / (N ₀ + I ₀ ) data per second (reverse closed loop power control period) from each traffic channel element 13, but it does not increase the base station load that occurs as the amount of data increases. In order to minimize and sample some of this data and receive E _bi / (N ₀ + I ₀ ) data from all traffic channel elements 13 in the sector, this can also increase the load on the base station. The data measured from the number of traffic channel elements or some of the traffic channel elements can be used to replace the distribution of all traffic channel elements in the sector, and the value for V _i receives the data rate at that time from each traffic channel element. Measure However, in consideration of the influence on the base station load, a conventionally known probability characteristic may be applied.

Next, the method of measuring the X value is as follows.

First, the signal from the test port of the low noise amplifier 11 of the base station is applied to the frequency reuse efficiency measuring unit 15.

Second, the frequency reuse efficiency measuring unit 15 measures the amount of power of the RF (Radio Frequency) input signal, and uses this value to measure the X value as shown in Equation 4 below.

On the other hand, the measurement for X _M is possible in 1.25msec units. Measurements for X are also possible in 1.25 msec increments. Therefore, the minimum period for measuring the frequency reuse efficiency value F is 1.25 msec. However, in this case, since the frequency reuse efficiency value (F) for the instantaneous power of the received power is obtained, it is difficult to consider it as meaningful statistical data. In order to analyze the state of the base station, at least several seconds to several minutes should be continuously observed.

Accordingly, the measured frequency reuse efficiency value F obtained at a 1.25 msec period can be referred to as a frequency reuse efficiency value F of the base station. That is, the frequency reuse efficiency of the corresponding sector of the base station may be quantitatively measured by a value such as an average value for a predetermined time of the frequency reuse efficiency value F, a probability density function (PDF), a cumulative density function (CDF), and the like. Here, the resultant value for the measured frequency reuse efficiency value (F) is controlled and managed in the operation maintenance unit 17 through a communication network connected to the communication connection unit 16 of the base station.

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.

The present invention as described above, by taking into account that the capacity and quality of service for the reverse radio link of the base station depends on the amount of interference received from other mobile stations, by quantitatively measuring the frequency reuse efficiency of the corresponding sector, There is an effect that can provide system capacity for a sector.

Claims (8)

In the frequency reuse efficiency measuring apparatus, Amplifying means for amplifying a signal received from the base station; Downconverting means for downconverting the received signal transmitted through the amplifying means into an intermediate frequency signal; Demodulation means for demodulating the intermediate frequency signal transmitted from said downconversion means; Call processing means for processing a value for data generated in the base station according to the signal transmitted through the demodulation means; The total power value received through the sector of the amplifying means, the data per bit for the total interference signal density transmitted from the demodulation means assigned to the sector and the traffic channel assigned to the sector from the call processing means. Measuring means for collecting / processing data on the number of elements to measure frequency reuse efficiency of the corresponding sector; Communication connection means for connecting a signal transmitted through the call processing means and the measurement means to a communication network; And Control means for monitoring and controlling the state of the base station according to the signal transmitted through the communication connection means Frequency reuse efficiency measuring apparatus comprising a. In the frequency reuse efficiency measuring method applied to the frequency reuse efficiency measuring apparatus, A first step of measuring a power level by using a signal received by a base station to measure a cell loading value (X) due to mobile stations in all cells including magnetic cells of a corresponding sector; Mobile stations in a cell by collecting data on the frequency of the traffic channel element data that is currently occupied and used in any frequency (FA) and in any sector and the total interfering signal density of the signal demodulated in each traffic channel element. Measuring the cell loading value X _M due to the second step; And The frequency reuse efficiency value F is determined by using the cell loading value X due to the mobile stations in all the cells including the magnetic cell of the corresponding sector and the cell loading value X _M due to the mobile stations in the cell. 3rd step measured in cycles Frequency reuse efficiency measurement method comprising a. The method of claim 2, A fourth step of statistically processing the frequency reuse efficiency value F measured at the predetermined period for a predetermined time and measuring the frequency reuse efficiency value again as a probabilistic value Frequency reuse efficiency measurement method further comprising. The method of claim 2 or 3, The cell loading value X due to the mobile stations in all the cells, including the cells of the sector of the first stage, is Substantially, the frequency reuse efficiency measurement measuring method characterized in that it has the same value as the following equation. (here, Where C is the total received power for the path, Z is the relative magnitude of the received power (C) relative to background noise, R is the data rate, W is the chip rate, and E _bi is the Bit power, N ₀ is the background noise power density, I ₀ is the different mobile station interference power density, M is the number of service mobile stations in the sector, v _i is the voice activity coefficient of mobile station i, and f is different for interference received from its cell. Interference received from the cell) The method of claim 4, wherein The cell loading value X _M due to the mobile stations in the cell of the fifth step is Substantially, the frequency reuse efficiency measurement method characterized in that it has the same value as the following equation. The method of claim 5, The frequency reuse efficiency value F of the third step is Substantially, the frequency reuse efficiency measurement method characterized in that it has the same value as the following equation. In the frequency reuse efficiency measuring device having a processor, A first function of measuring a power level using a signal received by a base station to measure a cell loading value (X) due to mobile stations in all cells including magnetic cells of a corresponding sector; Mobile stations in a cell by collecting data about the traffic channel element data that is currently occupied and used in any frequency (FA) and any sector and the energy per bit for the total interference signal density of the signal demodulated in each traffic channel element. A second function of measuring a cell loading value X _M due to; And The frequency reuse efficiency value F is determined by using the cell loading value X due to the mobile stations in all the cells including the magnetic cell of the corresponding sector and the cell loading value X _M due to the mobile stations in the cell. 3rd function to measure by cycle A computer-readable recording medium having recorded thereon a program for realizing this. The method of claim 7, wherein A fourth function of statistically processing the frequency reuse efficiency value F measured at the predetermined period for a predetermined time and measuring the frequency reuse efficiency value again as a probabilistic value A computer-readable recording medium that records a program for further realization.