KR19990058833A - Field test vehicle and field test method for code division multiple access system - Google Patents

Abstract

The present invention relates to an apparatus for field test of a code division multiple access (CDMA) system, and in particular, a test apparatus for measuring and developing a radio wave environment to be performed in the field after installation of a cellular and personal mobile communication system using the CDMA scheme. It is about.

The present invention provides a personal computer (PC) for a mobile terminal diagnostic monitor (MDM), a mobile telephone connected to the personal computer, a position measurement (GPS) device connected to the personal computer and providing location information of a mobile vehicle, A video tape player (VTR) connected to the personal computer via an audio / video switch and a digital audio tape (DAT) connected to the personal computer through an audio / video switch and storing voice information. ), A camcorder connected to the personal computer through a distribution amplifier, a camcorder for collecting image information, a monitor for image information transmission connected to the video tape player, and a power supply device for supplying power to each device.

Through the implementation of the present invention, if you want to derive the optimal parameters through the field test of the CDMA system, it can be utilized as a tool to improve the performance of the system by providing the optimum environment, all the data generated during the field test in real time It can be used as basic data for evaluating the quality of the network by monitoring and storing the data, and after testing the site in the vehicle, collecting the wireless environment information to a personal computer and analyzing the message, and thus reducing the test time. In addition, when testing by frequency, the terminals can be tuned by frequency, and then the status of each terminal can be monitored. At this time, by recording audio and video data using digital audio tape and camcorder, comprehensive analysis linked to high frequency environment can be performed.

Description

Field test vehicles and field test methods for code division multiple access systems

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to field test vehicles and field test methods for Code Division Multiple Access (CDMA) systems, in particular cellular and personal handhelds using code division multiple access. The present invention relates to a test apparatus and method for measuring a radio wave environment to be performed in a field after the installation of a personal communication service (PCS) system and developing a system.

According to IS-95, an international standardization organization, a typical mobile communication system using Code Division Multiple Access (CDMA) technology includes a mobile station (MS) provided with a service and a base station transceiver that provides a service. Subsystem: BTS).

Currently, a CDMA system operating in Korea includes a base station controller (BSC) for controlling the base station, a base station manager system (BSM) for operating and managing various base station controllers, in addition to a mobile terminal and a base station. A Mobile Switching Center (MSC) for connecting a base station to a public switched telephone network (PSTN), and a Home Location Register (HLR) for connecting to the switching center system and managing a service state of a mobile terminal.

The base station is connected to an existing Public Switched Telephone Network (PSTN), and a mobile terminal in each cell forms a radio channel with a base station serving a corresponding cell and performs communication. In this case, a channel formed in the direction of the mobile station from the base station is called a forward channel, and a channel formed in the direction of the base station from the mobile station is called a reverse channel.

The mobile station and the base station transmit and receive voice information and data by using a traffic channel, and pilot, synchronous, and paging channels except for the traffic channel are transmitted and received. It is called an additional channel, ie an overhead channel. Each base station and mobile terminal determines whether it should receive the data through pilot or paging (or code) transmitted on additional channels.

Each base station is assigned several frequencies according to system capacity and uses as many frequency channels. Each frequency channel is called frequency assignment (FA). CDMA systems can include multiple access channels by varying frequency offset and sequence per frequency channel.

In the CDMA system configured as described above, in order to provide a high quality mobile communication service to a plurality of subscribers, a wireless environment optimization step in a field is required after installation of the system. The field test method of the general mobile communication system according to the prior art is as follows. Connect the Spectrum Analyzer with an external antenna using a normal vehicle. Simply move a typical vehicle to measure propagation loss and reflect the results in a coverage area test.

According to the prior art performed as described above, when measuring the wireless environment in the field, the following several problems occur.

First, there is a risk of loss of test data when testing for a long time. In other words, they were able to get a brief overview of the instantaneous propagation environment and could not store the data.

Second, there are many tests, but there are many limitations in conducting a test by a general vehicle in the field, not in a laboratory. In other words, the measurement of power consumption of the terminal, other states of the terminal, measurement of Mean Opinion Score (MOS), and data analysis were very different from the actual service situation. As a result, efficient and significant research results could not be obtained.

Third, in the field test of the general mobile communication system, only the received power is measured in a short time. However, the CDMA / PCS digital mobile communication system uses many parameters, making it difficult to monitor air message analysis and terminal status immediately after testing in the field.

Therefore, in order to solve the above problems, the present invention smoothly provides a service to a subscriber of a mobile communication system using CDMA technology, thereby improving the success rate for a call attempt, preventing the truncation of a call in progress, and improving sound quality during a call. The purpose of the present invention is to provide a field test vehicle and a field test method for a code division multiple access system that can provide more efficient and reliable wireless environment optimization in a wireless field.

1 is a block diagram of the internal equipment of a field test vehicle according to the present invention.

Figure 2 is an actual configuration of the vehicle interior for the field test according to the present invention.

3 is a block diagram for executing a mobile terminal diagnostic monitor according to the present invention.

4 is a connection diagram of a test jig device according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: personal computer 200: mobile phone

300: GPS device 400: Video tape player (VTR)

500: Digital Audio Tape (DAT) 410,510: Audio / Video Switch

600: Camcorder 610: Distribution / Amplifier

700: monitor for transmitting image information 800: spectrum analyzer

One preferred embodiment of the present invention devised to achieve the object as described above,

A personal computer (PC) for a mobile terminal diagnostic monitor (MDM);

A mobile telephone connected with the personal computer;

A position measurement (GPS) device connected with the personal computer and providing position information of a mobile vehicle;

A video tape player (VTR) connected to the personal computer via an audio / video switch and storing image information;

A digital audio tape (DAT) connected to the personal computer through an audio / video switch and storing voice information;

A camcorder connected to the personal computer through a distribution amplifier, the camcorder collecting image information;

A monitor for transmitting image information connected to the video tape player;

It includes a power supply for supplying power to each device.

In one embodiment of the present invention, the mobile terminal diagnostic monitor of the personal computer, the strength of the pilot, the frame error rate (FER), the version of the operating program, the version of the terminal, the status of the vocoder, the message between the base station and the terminal and the current occupancy It is preferable to display information on the number of the channel being used.

The data collected / analyzed by the mobile terminal diagnostic monitor includes a transmit / receive power level of the terminal, a transmission level change range, multipath information, a frame error rate, a cell service area, GPS information, a channel message, a temperature analysis guideline, a markov frame rate, It is preferable to include an approximate automatic gain adjustment and closed loop power control, an automatic gain adjustment value and a closed loop power control,

Preferably, the mobile phone supports a code division multiple access (CDMA) scheme.

Preferably, the mobile phone is connected to a personal computer through a test jig set and collects field test data.

The GPS device preferably includes a GPS antenna for receiving location information from a GPS satellite and a GPS receiver for analyzing the received location information.

The GPS device preferably provides 95% accuracy within 100 m of all directions,

The video tape player preferably records all screens displayed on the mobile terminal diagnostic monitor and all image information input through the camcorder.

Preferably, the digital audio tape records a call state of a sender during a MOS (Mean Opinion Score) test.

Preferably, the camcorder receives distance information while measuring a signal strength and a transmission / reception electric field strength while driving a test vehicle.

It is preferable to further include a spectrum analyzer for receiving the power transmitted from the mobile communication system on the frequency axis and analyzing the radio wave environment to measure interference signals of other frequency bands,

When the location information data collected by the GPS device is lost, it is preferable to further include a dead reckoning to compensate for the moving path of the vehicle to maintain the location data,

A second preferred embodiment of the present invention for achieving the above object,

In performing a high frequency mobile communication environment test using a mobile vehicle,

Connecting the mobile telephone and the mobile telephone diagnostic monitor through a test jig device;

A second step of driving the mobile phone diagnostic monitor when the test jig device is connected;

A third step of confirming whether the GPS device showing the location information is fixed;

A fourth step of executing a diagnostic monitor (DM) program used in the mobile communication system;

A fifth step of checking only an item for which data is to be collected in an option of the diagnostic monitor program;

A sixth step of establishing a call of the mobile telephone connected to the test jig device;

A seventh step of collecting location information and data of a radio wave environment while moving the vehicle;

An eighth step of analyzing the collected data.

In the second embodiment of the present invention, the data collected in the seventh step is the transmit and receive power level of the terminal, the transmission level change range, multipath information, frame error rate, cell service area, GPS information, channel message, temperature It is desirable to include analysis instructions, Markov frame rate, approximate automatic gain adjustment and closed loop power control, automatic gain adjustment value and closed loop power control.

According to a third preferred embodiment of the present invention for achieving the above object, in performing a high frequency mobile communication environment test using a mobile vehicle,

Connecting the mobile telephone and the mobile telephone diagnostic monitor through a test jig device for voice quality testing;

A second step of driving the mobile phone diagnostic monitor when the test jig device is connected;

A third step of confirming whether the GPS device showing the location information is fixed;

A fourth step of executing a diagnostic monitor (DM) program used in the mobile communication system;

A fifth step of checking only an item for which data is to be collected in an option of the diagnostic monitor program; And

And a sixth step of setting up a call of the mobile phone connected to the test jig device and driving digital audio tape to record the transmitted and received voice.

The present invention efficiently analyzes the radio wave environment through on-site confirmation during high frequency operation for commercial services of digital mobile communication systems. Current location information, received power levels, handoff technology, and call quality tests are measured on the test vehicle in motion to obtain basic data for commercial testing of CDMA / PCS systems and future efficient system operation. It also provides field testing of new functional developments in CDMA / PCS systems.

1 is a block diagram showing the internal equipment of the field test vehicle according to the present invention. As shown, a Personal Computer (PC) 100 for a Mobile Diagnostic Monitor (MDM); A mobile telephone (200) connected to the personal computer (100) and supporting a code division multiple access (CDMA) scheme; A Global Positioning System (GPS) device 300 connected to the personal computer and providing location information of a moving vehicle; A video tape recorder (VTR) 400 connected to the personal computer through an audio / video switch 410 and storing all image information; A digital audio tape (DAT) 500 connected to the personal computer through an A / V switch 510 and storing all voice information; A camcorder 600 connected to the personal computer through a distributor / amplifier 610 and collecting image information; A monitor for transmitting image information (Red / Green / Blue Monitor: RGB Monitor) 700 connected to the video tape player; A spectrum analyzer 800 for analyzing the waveform; And power equipment such as an AC 110 / 220V, a DC 12V generator, a battery and an inverter.

Figure 2 shows the actual configuration of the interior of the vehicle for the field test according to the present invention. As shown, each device for the field test is installed inside the vehicle, the operator can retrieve the environmental information through the monitor of the personal computer.

The field test vehicle configured as described above will be described in detail for each part as follows.

The personal computer 100 is for mobile terminal diagnostic monitoring and collects and monitors test data. Collected data is output on the screen in real time and performs the function as a test terminal. The mobile terminal diagnostic monitor shows information on the pilot strength, frame error rate (FER), operating software version, terminal version, vocoder status, messages between the base station and the terminal, and channel numbers currently occupied. .

The CDMA telephone 200 is a terminal for collecting field test data.

The GPS device 300 is a multimode navigator composed of a GPS antenna for receiving location information from a satellite and a GPS receiver for analyzing the information. The GPS device 300 provides precise location information within 5 meters around the field test vehicle. The GPS device 300 provides 95% accuracy within 100 meters. It is used to provide accurate position information during operation of field test vehicle.

The video tape player (VTR) 400 records all screens displayed on the mobile terminal diagnostic monitor (MDM) and information input through the camcorder.

The digital audio tape (DAT) 500 is a device for recording the call state of the sender during the MOS test.

The digital audio tape 500 and the video tape player 400 may select a desired device for each individual computer by an audio / video switch when two or more personal computers are operated.

The field test vehicle operator measures a signal strength and a transmission / reception electric field strength of a driving region while driving a predetermined region, and the camcorder 600 is a device for inputting distance information and the like at this time. The image information input to the camcorder 600 is transferred to a personal computer by a distributor / amplifier 610.

The monitor 700 for transmitting image information is a screen provided to allow the field test vehicle operator to preview the information input to the video tape player 400.

The spectrum analyzer 800 analyzes a radio wave environment by receiving power transmitted from the system.

The field test vehicle configured as described above generates AC 110 / 220V and DC 12V voltages from an external generator and supplies them to a power supply device inside the vehicle.

3 is a diagram illustrating a line configuration for executing a mobile terminal diagnostic monitor according to the present invention. As shown, a personal computer (PC) 100 for collecting field test data and for monitoring mobile terminal diagnostics; A CDMA telephone 200 connected to the personal computer 100 through a test jig set; And a GPS device 300 that provides location information to the personal computer 100.

Hereinafter will be described in detail with respect to the operation of the present invention configured as described above.

First, a high frequency environment measurement method through the mobile terminal diagnostic monitor personal computer 100 will be described. The test jig device in charge of the interface between the CDMA mobile phone 200 and the personal computer 100 is connected. When the connection of the test jig device is completed, the personal computer 100 mounted in the vehicle is driven.

When the personal computer 100 is driven, it is checked whether the GPS device 300 showing the location information is locked. Run the Diagnostic Monitor (DM) program for CDMA / PCS systems. Check only the items you want to collect data in the diagnostic monitor program options. The call of the CDMA telephone 200 connected to the test jig device is set.

Collect location information and radio wave environmental data while moving the vehicle. Collected data is analyzed using a separate analysis tool.

Data that can be analyzed in the field test vehicle according to the present invention are as follows.

(1) terminal transmit / receive power level

(2) Transmission level change width

(3) Multi-Path Information

(4) Frame Error Rate (FER)

(5) Cell Coverage

(6) GPS information

(7) access channel, pilot channel, sync channel, traffic channel messages

(8) Temporal Analyzer Finger

(9) Markov Frame Rate Data

(10) Approximate Sparse Automatic Gain Control and Closed Loop Power Control

(11) Automatic gain control value and closed loop power control

Next, a voice quality test method using the digital audio tape (DAT) 500 will be described.

First, the CDMA mobile phone 200 and the personal computer 100 are connected to each other using a test jig device specially designed for voice quality test. When the connection of the test jig device is completed, the personal computer 100 mounted in the vehicle is driven. Check whether the GPS device 300 showing the location information is fixed.

Run the diagnostic monitor program used for CDMA / PCS systems. Check only the items you want to collect data in the diagnostic monitor program options. The call of the mobile phone connected to the test jig device is set and the digital audio tape 500 equipment is driven to record the transmission and reception voice.

In addition, a test method using the spectrum analyzer 800 will be described. First, the power transmitted from the system is received on the frequency domain. Analyze the radio wave environment using the received power in frequency units. It is also used for measuring interference signals in other frequency bands.

Finally, Dead Reckoning is explained. If the GPS data collected by the GPS device is lost, the vehicle's movement path is compensated for to maintain the location data.

4 shows a connection diagram of a test jig device according to the present invention. As shown, the personal computer and mobile phone are matched via a test jig device driven at 12V DC.

The field test vehicle according to the present invention performs a parameter optimization test related to system performance by using a CDMA terminal during a CDMA system field verification test. In addition, if necessary, interference signals for other systems can be measured, and the spectrum analyzer measures the signals for each frequency in multiple frequency operation.

Effects obtained through the field test vehicle according to the present invention operating as described above are as follows.

First, when deriving the optimal parameters through the field test of the CDMA system, it is used as a tool to improve the performance of the system by providing the optimal environment.

Second, it monitors and stores all the data generated during the field test in real time and uses it as basic data to evaluate network quality.

Third, after testing a site in a vehicle, wireless environment information may be collected by a personal computer, and a message may be analyzed to shorten a test time.

Fourth, the terminal can be tuned by frequency when testing by frequency, and then the status of each terminal can be monitored. At this time, by recording audio and video data using digital audio tape and camcorder, comprehensive analysis linked to high frequency environment can be performed.

Claims (15)

A personal computer (PC) for a mobile terminal diagnostic monitor (MDM); A mobile telephone connected with the personal computer; A position measurement (GPS) device connected with the personal computer and providing position information of a mobile vehicle; A video tape player (VTR) connected to the personal computer via an audio / video switch and storing image information; A digital audio tape (DAT) connected to the personal computer through an audio / video switch and storing voice information; A camcorder connected to the personal computer through a distribution amplifier, the camcorder collecting image information; A monitor for transmitting image information connected to the video tape player; A field trial vehicle of a code division multiple access system comprising power equipment for supplying power to each device. The method of claim 1, wherein the mobile terminal diagnostic monitor of the personal computer, the strength of the pilot, the frame error rate (FER), the version of the operating program, the version of the terminal, the status of the vocoder, the message between the base station and the terminal and the current occupied channel Field trial vehicle of a code division multiple access system displaying information about a number. The data collected and analyzed by the mobile terminal diagnostic monitor are: Transmitting and receiving power level of the terminal, transmission level variation, multipath information, frame error rate, cell service area, GPS information, channel message, temperature analysis guideline, Markov frame rate, approximate automatic gain control and closed loop power control, automatic gain A field trial vehicle for a code division multiple access system, comprising adjustment values and closed loop power control. The field trial vehicle of claim 1, wherein the mobile phone supports a code division multiple access (CDMA) scheme. The field trial vehicle of claim 1, wherein the mobile phone is connected to a personal computer via a test jig set and collects data for field trials. The field trial vehicle of claim 1, wherein the GPS device comprises a GPS antenna for receiving location information from a GPS satellite and a GPS receiver for analyzing the received location information. The field trial vehicle of claim 1, wherein the GPS device provides 95% accuracy within 100 meters in all directions. 2. The field trial vehicle of claim 1, wherein the video tape player records all screens displayed on the mobile terminal diagnostic monitor and all image information input through the camcorder. 2. The vehicle of claim 1, wherein the digital audio tape records the call state of the sender during a MOS (Mean Opinion Score) test. The field test vehicle of claim 1, wherein the camcorder receives distance information when measuring a signal strength and a transmission / reception electric field strength while driving the test vehicle. The field test vehicle of claim 1, further comprising a spectrum analyzer configured to receive power transmitted from a mobile communication system on a frequency axis, analyze a propagation environment, and measure an interference signal of another frequency band. The field test vehicle of claim 1, further comprising a dead adder configured to compensate for the moving path of the vehicle and maintain the position data when the position information data collected by the GPS device is lost. . In performing a high frequency mobile communication environment test using a mobile vehicle, Connecting the mobile telephone and the mobile telephone diagnostic monitor through a test jig device; A second step of driving the mobile phone diagnostic monitor when the test jig device is connected; A third step of confirming whether the GPS device showing the location information is fixed; A fourth step of executing a diagnostic monitor (DM) program used in the mobile communication system; A fifth step of checking only an item for which data is to be collected in an option of the diagnostic monitor program; A sixth step of establishing a call of the mobile telephone connected to the test jig device; A seventh step of collecting location information and data of a radio wave environment while moving the vehicle; An eighth step of analyzing the collected data, the field test method of the code division multiple access system. The method of claim 11, wherein the data collected in the seventh step, Transmitting and receiving power level of the terminal, transmission level variation, multipath information, frame error rate, cell service area, GPS information, channel message, temperature analysis guideline, Markov frame rate, approximate automatic gain control and closed loop power control, automatic gain A field test method for a code division multiple access system, comprising adjustment values and closed loop power control. In performing a high frequency mobile communication environment test using a mobile vehicle, Connecting the mobile telephone and the mobile telephone diagnostic monitor through a test jig device for voice quality testing; A second step of driving the mobile phone diagnostic monitor when the test jig device is connected; A third step of confirming whether the GPS device showing the location information is fixed; A fourth step of executing a diagnostic monitor (DM) program used in the mobile communication system; A fifth step of checking only an item for which data is to be collected in an option of the diagnostic monitor program; And And a sixth step of setting a call of the mobile telephone connected to the test jig device and driving digital audio tape to record the transmitted and received voice.