KR20020067445A - Base station condition testing system using a terminal in CDMA(code division multiple access) - Google Patents

Abstract

PURPOSE: A system for measuring the performance of a base station using a single mobile terminal in a CDMA system is provided to measure the performance of a base station with one mobile terminal using the method of changing the MIN(Mobile Identification Number). CONSTITUTION: A system for measuring the performance of a base station(120), capable of multi-FA(Frequency Allocation), using a single mobile terminal(110) in a CDMA system comprises a portable computer(100) and an interface unit(130). In the portable computer(100), an MIN operating program(100a) to manipulate the MIN of the mobile terminal(110) is installed. The interface unit(130) is provided for the data transmission and reception between the portable computer(100) and the mobile terminal(110). The MIN of the mobile terminal(110) is manipulated through the interface unit(130) according to the operation of the portable computer(100).

Description

Base station condition testing system using a terminal in code division multiple access (CDMA) in a code division multiple access system

The present invention relates to a base station performance measurement of a code division multiple access system. In particular, a base station performance using one mobile terminal in a code division multiple access system capable of measuring the performance of a multi-frequency assignable base station using one mobile terminal. It relates to a measuring system.

In general, in a code division multiple access (CDMA) mobile communication system, a multi-frequency allocation (Multi-Frequency Allocation) system that simultaneously operates several Radio Frequency Channels is used to accommodate a large number of subscribers in a high-traffic area such as a city center. FA)) method.

More specifically, each base station of a CDMA system is assigned a frequency to minimize interference to neighboring or coexisting base stations, but the number of channels that can be generated for one frequency is limited. That is, a base station in an area with a high traffic volume such as a city center is assigned one or more frequencies because only one frequency cannot accommodate many subscribers.

FA stands for Frequency Allocation, where 1FA, 2FA, and nFA have one, two, and several center frequencies.

If the current bandwidth of CDMA is 1.25MHz, and the bandwidth obtained by the operator is three times 1.25MHz (that is, 3FA), then 3.75MHz is allocated.

For example, in the case of a digital cellular system (DCS) service provider, a frequency of 800 MHz band is allocated. In this case, one terminal uses two frequencies for a base station transmission (forward link) and a base station reception (reverse link). Assigned. In order to use this allocated limited frequency more efficiently, it is used smaller.

In the case of CDMA, this frequency band is divided into units of 1.25 MHz (or exactly 1.23 MHz for DCS). This divided 1.25MHz frequency is called 1FA, which is the frequency bandwidth we use using a real mobile phone.

The number of subscribers that can be accommodated in such a FA depends on the type of base station. In other words, it depends on whether the base station is Omni or Sector.

Sectorization generally uses a directional antenna as a base station antenna, and uses three antennas with a beam width of 120 degrees. This nearly triples the capacity of the Omni model. As such, the 3Sector divides the base station antenna into three sectors (360 degrees) to serve each sector (120 degrees), and each sector is referred to as alpha, beta, and gamma.

In general, in terms of channel efficiency, cellular supports about 20 channels per sector and PCS supports about 13 channels. Therefore, the cellular 1FA 3Sector supports 20 channels per sector, so 3 * 20 = 60 channels can be supported.

Such FA allocation is automatically performed in the base station controller (control station) BSC, and it is determined whether there is a channel resource and allocates it from 1FA.

At this time, the FA assignment for the mobile terminal is not made by the BSC, but receives a variable such as the number of FAs of the base station received when registering the mobile terminal as a message, and the mobile terminal sends a FA by returning a hash algorithm to its IMSI (International Mobile Station Identity). Set it.

Therefore, various studies for measuring the performance of such a base station are in progress.

Hereinafter, a conventional code division multiple access mobile communication system will be described with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating a hardware configuration of a general code division multiple access mobile communication system, and FIG. 2 is a diagram illustrating a sector division diagram in which a cell controlled by a base station shown in FIG. 1 is divided into three sectors.

The CDMA mobile communication system includes a mobile station 1 which is a subscriber mobile terminal such as a car phone or a mobile phone, and a base station for each cell that connects the mobile station 1 and the control station 3 to send and receive various signal information through a data link ( 2) and a control station 3 that handles traffic channels and calls to and from the switching center 4.

In such a CDMA mobile communication system, a frequency having a bandwidth of 10 MHz is allocated to one base station 2 in the vicinity of an 800 MHz frequency, and the frequency is divided into approximately eight frequencies having a 1.25 MHz bandwidth.

In operating a system with Multi Frequency Assignment in a mobile communication system, if a device in the system fails to perform its function due to an error in abnormal operation state, the mobile device uses the frequency that the device is responsible for. Terminals do not provide a call service, which will be described in detail with reference to FIG. 3.

An area that can be controlled by the base station 2 is called a cell, and the cell is divided into three sectors (Alpha, Beta, Gamma) as shown in FIG. 2 by using a directional antenna. Each sector uses a plurality of frequencies in common, for example eight frequencies, while minimizing interference with each other.

3 is a diagram illustrating a hardware configuration of a general base station system, and FIG. 4 is a diagram for describing a performance measurement method of a multi-frequency assignable base station according to the prior art.

As shown in FIG. 3, there are several devices in the base station, and the RFC (Radio Frequency Card) 10 is responsible for converting a 4.950 MHz intermediate frequency (IF) signal into a UHF band signal, and the like. One RFC 10 is installed, and one RFC 10 is divided into portions that are in charge of each frequency and is responsible for each of the above functions.

And the ACC (Analog Common Card) 20 is responsible for the function of receiving three timing signals and supplying the rest of the digital shelf (Digital Shelf), one ACC 20 is installed in each sector, one The ACC 20 is divided into portions that are in charge of each frequency and is responsible for each of the above functions.

A sector interface card 40 combines baseband forward signals to upconvert to an IF frequency and supplies timing, and one sector interface card 40 for each sector for each frequency. It is in charge of the above function.

When a base station is operated with multiple FAs, when an error occurs in a portion that is responsible for a specific frequency of a specific sector of the RFC 10 and causes an abnormal operation, mobile terminals in the corresponding frequency and sector are not called. Similarly, if an error occurs in the ACC 20 and causes an abnormal operation, the mobile terminals corresponding to the corresponding frequency and sector are not provided with a call service. In addition, when an error occurs in a portion in charge of a specific frequency of the SIC 40, the mobile terminal corresponding to the frequency irrespective of the sector, the call service is not provided.

In order to measure (check) such an error occurrence, the multi-frequency allocation measurement method in the code division multiple access system according to the prior art is connected to the base station 120 and the shield line 140 to transmit or transmit the base station 120 or the like. The mobile terminal 110 generates a call to the base station 120 to measure (check) a reception state, or receives a call from the base station 120, and the mobile terminal 110 and the base station 120 A conventional base station having a portable computer 100 for receiving and analyzing the results of transmission and reception between the mobile station, an interface means 130 for transmitting and receiving data between the portable computer 100 and the mobile terminal 110, and multiple FAs. In (120), the mobile terminal 110 is connected to the base station 120 and the shield (shield) line 140 so as not to receive a signal from another base station, the signal of the base station 120 connected purely to the shield line 140 Only to receive.

At this time, the mobile terminal 110, as described in Figure 3, when the base station 120 is operating in multiple FA, RFC 10 in the base station 120 through the call generation and call reception with the base station 120, Measurement (check) data of whether an error occurs in the ACC 20 or the SIC 40 or the like is transmitted to the portable computer 100.

That is, the mobile terminal 110 receives the overhead information from the base station 120 using the basic frequency at the time of initial opening and has a unique identification number of the mobile identification number (Mobile Identification Number). Hash)

When the base station 120 operates as a multiple FA, the base station 120 transmits the frequency to all mobile terminals of the cell using the number and frequency number of the operating frequency as the base frequency. When received, the HASH function is used to determine which frequency to use efficiently. In this case, when an error occurs in a specific sector, all mobile terminals in the specific sector cannot make a call. The current state of the base station 120 can be measured by detecting an error of the specific sector.

For example, when the mobile terminal 110 generates a call to an arbitrary destination terminal, the mobile station 110 receives a call from the base station 120 connected to the mobile terminal 110 through the shield line 140. When a failure occurs, the base station 120 does not transmit an ACK message for the call generated by the mobile terminal 110 to the mobile terminal 110. If the call is generated again, and if there is no response message from the base station 120 again, the transmission power is increased again by a certain level, and the call is generated again. It is determined that a problem has occurred in the receiver of 120.

This method is the same when the call is made to the mobile terminal 110 connected to the base station 120 and the shield line 140. That is, when making a call to the mobile terminal 110 connected to the base station 120, if the mobile terminal 110 does not receive a call for a predetermined time or a number of times from the base station 120 to the mobile terminal 110, the base station 120 transmitter It is also determined that the abnormality occurred. Of course, although the base station 120 and the mobile terminal 110 are connected to the shield line 140 in FIG. 4, the base station 120 and the mobile terminal 110 may be measured without being connected to the shield line 140. That is, the communication service to the mobile terminal 110 is provided by the base station closest to the mobile terminal 110.

In such a general mobile communication system, when a call processing resource is routed by a man machine command (MMC) during call processing, a FA is fixed using a mobile identification number (MIN), which is a unique identification number of each mobile terminal. Only resources were available. Herein, MIN is required to determine the reception frequency setting of the mobile terminal 110. The MIN is used to assign a channel identifier in the call control processor and the mobile terminal in the control station. This method is one of the efficient methods for resource management. Use a function to prevent all calls from concentrating on one FA. That is, as described above, each mobile terminal is assigned a mobile identification number (MIN), which is a unique identification number assigned to the mobile terminal telephone number of the mobile communication service provider, and the MIN is designed to receive only a specific FA. For example, it is designed to receive only a specific FA of 1FA, 2FA or nFA to prevent the call from being concentrated in one FA.

In the case of DCN, up to 10FA can be used. Cells with a large mobile communication population use all 10FA, but cells with a small mobile communication population use only 2FA.

Therefore, in the related art, a mobile terminal (or a mobile terminal module) that analyzes and measures a call channel for multiple FAs of a specific base station or a state of multiple FAs or sectors of a base station is measured. All FAs operated by the base station should be prepared.

That is, since the mobile terminal 110 as shown in FIG. 4 is designed to receive only one specific FA, it is necessary to prepare each mobile terminal for analyzing and measuring a call channel for multiple FAs.

Therefore, when it is necessary to measure the performance of a base station according to multiple FAs transmitted from a base station with a mobile terminal (or mobile terminal module) in a specific system, the number of mobile terminals (or mobile terminal modules) as many as the entire multiple FAs is needed. There is a problem to be provided.

An object of the present invention is to solve the problems of the prior art mentioned above, by using a method of changing the mobile terminal identification number (MIN) code division multiple that can measure the base station performance with only one mobile terminal It is to provide a base station performance measurement system using one mobile terminal in an access system.

According to a feature of the present invention for achieving the above object, a multi-frequency allocation is possible, has a base station that is divided into a plurality of sectors to exchange various signal information data with mobile terminals, and has a unique identification number (MIN), Built-in a mobile terminal for measuring the base station reception sensitivity, a program for manipulating a unique identification number of the mobile terminal, and by operating the embedded program to measure the frequency allocation or sector-specific channel quality of the communication system including the base station It consists of a control device.

Preferably, the control device and the mobile terminal are connected via a wired / wireless interface means to transmit and receive the channel quality measured by the mobile terminal according to a unique identification number manipulated according to the operation program. Here, the air interface means uses any one of infrared transmission and reception means or Bluetooth transmission and reception means.

Preferably, the control device detects an abnormality of the communication system including the base station for each of the multi-frequency allocation and the sector according to the operation of the unique identification number. The abnormality of the communication system is based on the frequency card function of the frequency-by-sector or sector-by-sector or the analog common card portion or the sector-by-sector basis for supplying a timing signal to the frequency-sector-by-sector digital shelf. The band forward signal is combined to upconvert to an intermediate frequency and detect one or more abnormalities of a sector interface card portion that supplies timing.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

1 illustrates a hardware configuration of a general code division multiple access (CDMA) mobile communication system.

FIG. 2 is a diagram illustrating a sector division diagram in which a cell controlled by the base station shown in FIG. 1 is divided into three sectors. FIG.

3 is a diagram illustrating a hardware configuration of a general base station system.

4 is a view for explaining a performance measurement method of a multi-frequency assignable base station according to the prior art;

5 is a diagram illustrating a multi-frequency assignable base station performance measurement system according to the present invention.

Hereinafter, a base station performance measurement system using one mobile terminal in a code division multiple access system according to the present invention will be described.

In general, the transmission power of the CDMA base station is sensitive to factors such as temperature and time, and thus the value is not kept constant. The change in transmission power is closely related to the call quality, so that the call quality is improved. Compensation of the transmit power is required. In other words, equal quality level should be secured for each FA in base station establishment, FA extension, or multiple FA operation. In addition, it is necessary to monitor the operation status and operation abnormalities of the base station, more specifically the various devices (see Fig. 3) constituting the base station. At this time, the present invention provides a method for monitoring the operation status and operation abnormality of the base station while measuring multiple FAs with only one mobile terminal.

5 is a diagram illustrating a method for measuring a multi-frequency allocation base station state using one mobile terminal in a code division multiple access system according to the present invention.

In the code division multiple access system according to the present invention, for measuring the state of a base station using a mobile terminal, a portable computer (or FA measuring device) 100 having a program 100a for operating a mobile terminal identification number is provided. In the conventional mobile communication base station 120 having an interface means 130 for transmitting and receiving data between the portable computer 100 and the conventional mobile communication terminal (or mobile terminal module) 110, and multiple FAs In addition, the portable computer 100 may install a MIN operation program 100a capable of operating a MIN, which is a unique identification number of the mobile terminal 110, and may be installed through the interface means 130 according to the operation of the portable computer 100. Manipulate the MIN of 110). In this case, the mobile terminal 110 should have a function of a conventional mobile communication mobile terminal for analysis and measurement of call quality according to multiple FA operations, and can be configured as a conventional mobile communication mobile terminal or a mobile terminal module.

In this case, although the wireless communication between the base station 120 and the mobile terminal 110 is performed in FIG. 5, the shield line 140 is connected between the base station 120 and the mobile terminal 110 as shown in FIG. 4 as necessary. After the connection, the multi-frequency allocation measurement and the base station state measurement according to the present invention can be performed.

In addition, although the mobile terminal 110 and the portable computer 100 are illustrated as being connected by a wired interface means 130 in the drawing, it is possible to transmit and receive necessary data using a wireless interface means such as infrared (IrDA) or Bluetooth (Bluetooth). Can be.

In addition, the portable computer 100 may be configured as a device having a controller in which a program 100a for operating an identification number of the mobile terminal 110 is embedded. Is called.

As such, when the MIN of the mobile terminal 110 is operated by the portable computer 100, the mobile terminal 110 that receives only a specific FA, for example, a frequency of the 1FA band, may receive a frequency of the 2FA band according to the MIN.

Subsequently, when the MIN allocated to each FA is manipulated using the MIN operation program 100a of the portable computer 100, the mobile terminal 110 receives frequencies in the 3FA to nFA bands.

That is, all FAs of the base station 120 having multiple (plural) FAs (assignable) are received using one mobile terminal 110 only by changing the MIN of the mobile terminal (or mobile terminal module) 110. It is possible.

In addition, as described in the related art of FIG. 3, the mobile station is responsible for converting various devices of the base station 120, that is, a 4.950 MHz intermediate frequency (IF) signal into a signal of the UHF band, and one RFC (one installed in each sector). 10), the timing signal is received and supplied to the rest of the digital shelf (Digital Shelf), the ACC (20) installed in each sector, the baseband forward signal by combining the up-converted to the IF frequency and When a failure occurs in the sector interface card 40 or the like which provides a function of supplying timing, it can be detected.

That is, as described with reference to FIG. 3, when a base station is operated with multiple FAs, when an error occurs in a part that is responsible for a specific frequency of a specific sector of the RFC 10 and causes an abnormal operation, movement in the corresponding frequency and sector is performed. If the terminal does not make a call and an error occurs in the ACC 20 and causes an abnormal operation, the mobile terminals corresponding to the corresponding frequency and sector are not provided with the call service, and are responsible for a specific frequency of the SIC 40. If an error occurs, the mobile terminals corresponding to the frequency regardless of the sector are not provided with the call service.

The base station state measurement method in a code division multiple access system according to the present invention for measuring (checking) such an occurrence of an error is performed by the base station 120 in order to measure (check) a transmission or reception state of the base station 120. A mobile computer that generates a call or receives a call from the base station 120, and a portable computer that receives and analyzes and measures the transmission and reception result between the mobile terminal 110 and the base station 120 ( 100, the interface means 130 for transmitting and receiving data between the portable computer 100 and the mobile terminal 110, and the conventional base station 120 having multiple FAs, the mobile terminal 110 is a base station ( When 120 is operated as a multiple FA, whether an error has occurred in the RFC 10, the ACC 20, or the SIC 40 in the base station 120 through call generation and call reception with the base station 120, etc. The measurement (check) data for the portable computer 100 .

That is, the mobile terminal 110 receives the overhead information from the base station 120 using the basic frequency at the time of initial opening and has a hash function to determine which frequency to use with its mobile identification number (MIN). Decide by

When the base station 120 operates as a multiple FA, the base station 120 transmits the frequency to all mobile terminals of the cell using the number and frequency number of the operating frequency as the base frequency. When received, the HASH function is used to determine which frequency to use efficiently. In this case, when an error occurs in a specific sector, all mobile terminals in the specific sector cannot make a call. The current state of the base station 120 can be measured by detecting an error of the specific sector.

For example, when the mobile terminal 110 generates a call to an arbitrary destination terminal, the base station 120 receives the call. If a failure occurs in the receiver of the base station 120, the base station 120 Since the mobile terminal 110 does not transmit an acknowledgment (ACK) message for the call generated by the mobile terminal 110 to the mobile terminal 110, the mobile terminal raises the power level by a predetermined level after the set time and generates the call again, and again from the base station 120 If there is no response message, the transmission power is increased again by a certain level, and the call is generated again. If there is no response from the base station 120 even when the call occurs for a number of times or more, it is determined that a problem occurs in the receiver of the base station 120.

This method is also the same when the call is generated after connecting the base station 120 and the mobile terminal 110 with the shield line 140.

In the mobile communication system of the present invention, when a call processing resource is designated by a Man Machine Command (MMC) during call processing, various FA resources are used according to the operation of the MIN operation program 100a in the portable computer 100. Can be. That is, as the mobile terminal 110 operates the MIN operation program 100a of the portable computer 100, the MIN is changed and thus receives multiple FAs.

Accordingly, in the present invention, a call channel for multiple FAs of a specific base station or a state of multiple FAs or sectors of a base station is analyzed and measured to analyze, measure, and measure a state of a base station. Mobile terminal module) only.

That is, the mobile terminal 110 as shown in FIG. 5 can receive various FAs.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

In the present invention, in the code division multiple access system, the multi-frequency allocation measurement method and the base station state measurement method using one mobile terminal can measure multiple FAs using only one mobile terminal (mobile terminal module). However, there is no need to replace the mobile terminal or reconfigure the settings of the measuring instrument (portable computer) for various FA measurements, and at the same time, measure the status of the base station, precisely the components inside the base station (RFC, ACC and sector interface cards, etc.). There is also an effect that can be done.

Claims (5)

A base station capable of multi-frequency allocation and divided into a plurality of sectors to exchange various signal information data with mobile terminals; A mobile terminal having a unique identification number (MIN) and measuring the base station reception sensitivity; Code division comprising: a built-in program for manipulating a unique identification number of the mobile terminal; and a control device for measuring frequency allocation or channel quality of each sector of a communication system including the base station by operating the embedded program. Base station performance measurement system using one mobile terminal in a multiple access system. The code of claim 1, wherein the control device and the mobile terminal transmit and receive channel quality measured by the mobile terminal according to a unique identification number which is connected to a wired / wireless interface unit and is operated according to the operation program. A base station performance measurement system using one mobile terminal in a split multiple access system. The base station performance measurement system using a mobile terminal in a code division multiple access system according to claim 2, wherein the air interface means uses any one of an infrared transceiver and a Bluetooth transceiver. The system of claim 1, wherein the control device detects an abnormality of the communication system including the base station for each of the multi-frequency allocation and the sector according to the operation of the unique identification number. Base Station Performance Measurement System Using Mobile Terminal. The communication system according to claim 4, wherein an abnormality of the communication system includes: a part in charge of a frequency card function of the frequency-by-sector or sector-by-sector communication system, or an analog common card part that supplies timing signals to the frequency-by-frequency or sector-by-sector digital shelf; Base station performance using a single mobile terminal in a code division multiple access system, characterized in that the baseband forward signal for each sector is combined to upconvert to an intermediate frequency and detect at least one of a sector interface card part for supplying timing. Measuring system.