KR100334766B1 - Apparatus and method for measuring quality of call between bts and terminal in wireless communication system - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

An apparatus and method for measuring call quality in a wireless communication system.

I. The technical problem to be solved by the invention

An apparatus and method for measuring call quality in a wireless environment are provided.

All. Summary of Solution of the Invention

An apparatus according to an embodiment of the present invention is a device for measuring the call quality between the base station and the terminal of the wireless communication system,

A base station, a terminal station, and a collecting device;

A test call control unit for performing control according to a test call of a terminal station when the test call is started, terminated and a test call is performed, and an output unit for receiving and outputting the result data of the test call received from the terminal station,

The terminal station;

A bit error rate detector for detecting a bit error rate by comparing bits of a predetermined pattern received through the forward traffic channel with data of a predetermined pattern, and generating a bit pattern to be transmitted through the reverse traffic channel; A test call monitoring unit for monitoring the status of the test call and a bit error rate transmission unit for transmitting the bit error rate of the forward link to the base station,

The base station is;

A time switch for generating a predetermined pattern to a traffic channel of a forward link and transmitting the predetermined pattern to a wireless channel, and detecting a bit error rate of the reverse link compared to a predetermined contracted bit pattern received to a traffic channel of a reverse link, and a test call It is characterized in that the test call monitoring unit for monitoring the test call status of the base station while performing.

la. Important uses of the invention

It is used to measure call quality in wireless communication system.

Description

Apparatus and method for measuring call quality between base station and terminal in wireless communication system {APPARATUS AND METHOD FOR MEASURING QUALITY OF CALL BETWEEN BTS AND TERMINAL IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a method for measuring the quality of a call, and more particularly to a method for measuring the quality of a call in a wireless communication system.

Typically, a wireless communication system transmits and receives data wirelessly with a terminal. A representative example of such a wireless communication system is a wireless local loop (WLL) having a mobile station such as a cellular system or a PCS system or a terminal station in a premises and performing data and voice communication with the wireless system through a wireless channel. There is a system. Since the above systems transmit and receive data and voice signals in a wireless channel environment, call quality is more problematic than general wired systems. A method of measuring call quality between a base station and a terminal in such a wireless communication system will be described with reference to FIG. 1.

FIG. 1 is a system configuration diagram of detecting a bit error rate for checking a call quality in a typical wireless local loop system. Hereinafter, a process of checking call quality and a configuration of a system in a wireless local loop system will be described with reference to FIG. 1.

The base station 10 includes a time switch 12 for transmitting and receiving data therein and checking a bit error rate of the received data, and measuring an error rate detected by the time switch 12. ). In addition, the terminal station 20, which is an indoor device of the wireless local system, includes a modem 22 for transmitting and receiving data and an error rate measuring unit 21 for checking an error rate of the data detected by the modem 22. At this time, the base station and the terminal station is connected by wire to measure an accurate bit error rate. This is because when the bit error rate is checked for the bit pattern, if the delay between the base station and the terminal station is unnatural, the exact bit error rate cannot be checked. In the wireless channel environment, accurate call quality can be checked only by measuring both the bit error rate of the reverse link and the forward error of the forward link.

The method of checking the bit error rate of the reverse link will first be described in the configuration of FIG. The error rate measuring unit 11 provided in the base station generates a bit pattern of the forward link and transmits the bit pattern to the time switch 12. In addition, the time switch 12 transmits the bit pattern received from the reverse link to the error rate measuring unit 11 provided in the base station. The error rate measuring unit 11 then compares the bit pattern defined in the reverse link with the received bits using the received data to detect the bit error rate.

Next, a method of measuring the bit error rate of the forward link will be described. The error rate measuring unit 21 located in the terminal station 20 generates a pit pattern for a reverse link and transmits it to the modem 22. The data received from the base station 10 through the wired path and demodulated by the modem 22 is received and compared with the bit pattern defined in the forward link. The error rate of the forward link is checked using the comparison result.

In this case, in the wireless communication system, even though data is transmitted and received in a wireless environment, the base station 10 and the terminal 20 must be connected by wire. In other words. The synchronization between the base station and the bit error rate measuring apparatus of the terminal station should be synchronized. Therefore, there is a problem that can have a large difference from the bit error rate when actually transmitting and receiving data. In addition, since the base station 10 and the terminal station 20 is connected by wire, there is a problem that the restrictions of the place. In addition, there is a problem in that the base station and the terminal station must be provided with the error rate measuring unit in advance or a device for connecting the same in order to detect the bit error rate.

Accordingly, an object of the present invention is to provide an apparatus and method that can be performed in a wireless environment when measuring call quality between a base station and a terminal of a wireless communication system.

Another object of the present invention is to provide an apparatus and a method capable of checking an accurate call quality without being restricted by a place when measuring call quality between a base station and a terminal of a wireless communication system.

An apparatus according to an embodiment of the present invention for achieving the above objects is a device for measuring the call quality between the base station and the terminal of the wireless communication system,

A base station, a terminal station, and a collecting device;

A test call control unit for performing control according to a test call of a terminal station when the test call is started, terminated and a test call is performed, and an output unit for receiving and outputting the result data of the test call received from the terminal station,

The terminal station;

A bit error rate detector for detecting a bit error rate by comparing bits of a predetermined pattern received through the forward traffic channel with data of a predetermined pattern, and generating a bit pattern to be transmitted through the reverse traffic channel; A test call monitoring unit for monitoring the status of the test call and a bit error rate transmission unit for transmitting the bit error rate of the forward link to the base station,

The base station is;

A time switch for generating a predetermined pattern to a traffic channel of a forward link and transmitting the predetermined pattern to a wireless channel, and detecting a bit error rate of the reverse link compared to a predetermined contracted bit pattern received to a traffic channel of a reverse link, and a test call It is characterized in that the test call monitoring unit for monitoring the test call status of the base station while performing.

The method according to an embodiment of the present invention for achieving the above object is a method for measuring the call quality between the terminal station and the base station is connected to a collecting device to the terminal station, when the test call is established, the base station is in the forward link Generating a predetermined bit pattern to transmit to the terminal station through a forward traffic channel, and the terminal station inspects and transmits a bit error rate for the data of the received bit pattern to the base station and forward bit error rate. Notifying the collecting device and checking the error rate of the forward link, the terminal station generating a bit pattern of a reverse link previously agreed to the base station and transmitting the bit pattern to the base station through a reverse traffic channel; When the base station receives reverse bit pattern data, And checking the bit error rate and transmitting the bit error rate to the terminal station, and transmitting the received bit error rate data to the collection apparatus when receiving the received bit error rate data.

1 is a system configuration diagram when detecting a bit error rate for checking the quality of a call in a typical wireless local loop system,

2 is a block diagram of an apparatus for checking call quality with a base station in an environment of a wireless channel in a terminal station according to an embodiment of the present invention;

3 is a signal flow diagram of a process of detecting a bit error rate of a test call according to an embodiment of the present invention;

4 is a block diagram of an apparatus for checking a call quality with a terminal station in an environment of a wireless channel in a base station according to another embodiment of the present invention;

5 is a signal flow diagram of a process of detecting a bit error rate of a test call according to another embodiment of the present invention.

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

2 is a block diagram of an apparatus for checking call quality with a base station in a wireless channel environment in a terminal station according to an embodiment of the present invention. Hereinafter, the configuration and operation of the apparatus according to the present invention will be described in detail with reference to FIG. 1.

The base station 100 and the terminal station 110 is connected to a wireless environment of the PCM method to transmit and receive data. In addition, FIG. 2 illustrates a configuration in which a collecting device 120 according to the present invention for measuring call quality is connected to a terminal station. In this case, the configuration of the base station 100, the terminal station 110, and the collection device 120 and the operation of each configuration will be described. First, the configuration and operation of the base station 100 will be described. The test call monitoring unit 103 of the base station 100 monitors the state of the test call among the information received on the predetermined channel of the reverse link when the test call is performed. The bit error rate transmitter 102 receives the bit pattern received through the traffic channel of the reverse link, checks the bit error rate, and transmits the bit error rate through the signal channel of the forward link. The time switch 101 compares the bit pattern with the data received on the reverse link traffic channel, and transmits the error rate of the reverse link traffic channel to the terminal as a signal channel of the forward link. The time switch 101 generates and transmits a bit pattern through a traffic channel of a forward link.

Next, the configuration and operation of the terminal station 110 will be described. First, the terminal station 110 is provided with at least a bit error detection unit 111, a test call monitoring unit 112, and a bit error rate transmission unit 113 in accordance with the present invention. The bit error rate detector 111 derives a bit error rate by comparing a predefined bit pattern of data received through a traffic channel of a forward link. The derived bit error rate is transmitted to the collecting device 120. In addition, the bit error rate detection unit 111 generates and transmits a bit pattern for transmission through a traffic channel of a reverse link. The test call detection unit 112 monitors the test call when the test call is performed in the terminal station 110. The bit error rate transfer unit 113 extracts the bit error rate received on the signal channel of the forward link, that is, the bit error rate transmitted from the base station by checking the state of the traffic channel of the reverse link, and extracts the extracted data. Forward to 120.

Then look at the configuration and operation of the collecting device 120 according to the present invention. The collection device 120 may configure a notebook computer or a personal computer and a workstation. When using the above computers, a program or task that performs the function shown in FIG. 2 must be driven. In the following description, it is assumed that the task is driven in the collection device 120. The output unit 121 of the collecting device 120 outputs the bit error rate data of the reverse link received from the bit error rate transfer unit 113 of the terminal station 110 to the operator. In addition, when the test call is requested, the test call control unit 122 controls the start of the test call to each device of the terminal station 110, and controls the process of ending the test call.

In FIG. 2, only a process of performing a test call with respect to a base station has been described, and is illustrated in FIG. 2. However, if the control of the test call is performed in the base station controller, the base station is simply configured to transfer the received data to the base station controller, and the base station controller is configured to have each configuration shown in FIG. 2 to control the test call. Can be configured to do so.

3 is a signal flowchart of a process of detecting a bit error rate of a test call according to an embodiment of the present invention. Hereinafter, a process of detecting a bit error rate of a test call will be described in detail with reference to FIGS. 2 to 3.

When the test call is required, the collection device 120 generates a signal for starting the test call in step 200 in the test call control unit 122 of the collecting device 120 and transmits the signal to the terminal station 110. Accordingly, the terminal station 110 performs an access request using an access channel (AXCH) in step 202. Accordingly, the base station 100 transmits a connection response signal on the pilot channel (PGCH). This is a signal such as a connection permission or a connection failure. The terminal station 110 transmits a signal according to the call connection result to the collecting device 120 in step 206. After this process, it is assumed that a channel for performing a test call is set up.

The time switch 101 of the base station 100 generates a bit pattern to be transmitted through the forward traffic channel in step 208. In operation 210, the generated bit pattern is transmitted to the terminal station 110 through the traffic channel of the forward link. Upon receiving this, the bit error rate detection unit 111 of the terminal station 110 measures the bit error rate by comparing the data of the bit pattern received through the traffic channel of the forward link with a previously provided bit pattern in step 212. In step 214, the forward bit error rate is reported to the output unit 121 of the collecting device 120. Accordingly, the collecting device 120 outputs a bit error rate to the operator on the traffic channel of the received forward link. In addition, the bit error rate detection unit 111 of the terminal station 110 proceeds to step 216 and transmits bit error rate information to the base station through the signal channel (SGCH) of the reverse link. This allows the operator to check the bit error rate on the traffic channel of the forward link. The base station 100 may also check the bit error rate of the forward link.

As described above, when the bit error rate of the forward channel is checked, the reverse bit error rate is checked. The bit error rate detection unit 111 of the terminal station 110 generates a bit pattern to be transmitted through the reverse link in step 218 under the control of the test call control unit 122. In step 220, the bit pattern generated through the traffic channel of the reverse link is transmitted. The base station 100 receives this, and measures the bit error rate in step 222. This is performed by the time switch 101 of the base station 100. In operation 224, the time switch 101 of the base station 100 transmits the bit error rate information through the forward signal channel. Upon receiving this, the terminal station 110 proceeds to step 226 and reports the reverse bit error rate to the collecting device 120. When the bit error rate of the reverse direction is reported through the above process, the collecting device 120 controls to perform the test call release in step 228. Then, the terminal station 110 requests disconnection using the reverse channel signal channel (SGCH) in step 230, and the base station proceeds to step 232 to receive the signal channel (SGCH) of the forward link. It informs that call termination is completed. When receiving the call release completion signal, the terminal station 110 proceeds to step 234 and transmits a call release result signal to the test call control unit 122 of the collecting device 120. Through this process, the bit error rate of the forward link and the bit error rate of the reverse link are completed. Although the end of the test call is described as being controlled by the collecting device in the above process, when the test call is configured to be performed for a predetermined time in advance, the control of the collecting call may not be performed. Then, the terminal station 110 may be configured to perform a process of automatically blocking a call, or the base station 100 may be configured to perform a process of automatically blocking a call.

In FIG. 3, the base station examines the pattern of the reverse link and assumes that the pattern of the forward link is generated and transmitted. However, when the base station controller does this, not the base station, the base station only needs to be configured to transmit data received through the radio channel to the base station controller. And if the work performed in the base station described in the process of Figure 3 is configured to be performed in the base station controller it can all be achieved.

4 is a block diagram of an apparatus for checking call quality with a terminal station in a base station in a wireless channel according to another embodiment of the present invention. Hereinafter, the configuration and operation of each apparatus for checking call quality with a terminal station in a wireless channel environment in a base station will be described in detail with reference to FIG. 4.

In the present invention, when the collecting device 310 is connected to the base station 300, the base station 300 has a configuration different from that of FIG. In addition, the terminal station 320 also has a configuration different from that of FIG. 2. The configuration and operation of each apparatus will be described.

First, the base station 300 will be described. The time switch 301 of the base station derives a bit error rate by comparing data received in the traffic channel of the reverse link with data of a predetermined bit pattern. Then, the bit error rate data received through the traffic channel of the forward link is received and transmitted to the collecting device 310. The time switch 301 generates and outputs a bit pattern for transmission on a traffic channel of a forward link. The bit error rate detection unit 302 extracts the bit error rate information of the traffic channel of the forward link received through the traffic channel of the reverse link received from the terminal station 302 and transmits it to the collecting device 310. That is, the bit error rate transmitted from the bit error rate detection unit 302 to the collecting device is a terminal station 320 of the bit pattern signal transmitted through the traffic channel of the forward link transmitted from the base station 300 to the terminal station 320. And the bit error rate according to the received error signal, and the transmitted error rate is transmitted to the base station 300.

Next, the configuration and operation of the collecting device 310 will be described. As described above with reference to FIG. 2, the collection device 310 may be configured as a personal computer, a workstation, a notebook computer, or the like, and the bit error rate collector 311 and the call controller 312 should be provided at least. The bit error rate collector 311 receives the bit error rate information received from the base station 300 through the traffic channel of the forward or reverse link. And it controls the operation to output to the operator. The call controller 312 controls the base station 300 to control the origination and termination of the test call when the test call is performed.

Next, the configuration and operation of the terminal station 320 will be described. The terminal station 320 includes at least a bit error rate detector 321, a test call monitor 322, and a bit error rate transmitter 323. The bit error rate detector 321 detects a bit error rate by comparing the data received in the traffic channel of the forward link with a predetermined bit pattern. And transmits bit error rate information for the traffic channel of the forward link to the signal channel of the reverse link. In addition, the bit error rate detector 321 generates and transmits a bit pattern for transmission on a traffic channel of a reverse link. The test call monitoring unit 322 monitors the state of the test call while the test call is performed in the terminal station 320. The bit error rate transmitter 323 transmits the bit error rate information to the signal channel of the reverse link.

5 is a signal flowchart of a process of detecting a bit error rate of a test call according to another embodiment of the present invention. Hereinafter, a signal flow in the case of detecting a bit error rate of a test call according to an embodiment of the present invention will be described in detail with reference to FIGS. 4 to 5.

When the operator requests a test of the test call, the call controller 312 of the collecting device 310 generates a signal according to the test call in step 400 and transmits the signal to the base station 300. Then, the base station 300 transmits the access request signal to the terminal station 320 through the pilot channel (PGCH) in step 402 in order to receive and process the test call. Accordingly, when the terminal station 320 receives the call connection request signal, the terminal station 320 drives the bit error rate detector 321, and the test call monitor 322 and the bit error rate transmitter 323 are driven. The terminal station 320 proceeds to step 404 and transmits an access response signal through an access channel (AXCH). When the base station 300 receives the access response signal, the base station 300 transmits the call response result signal to the collecting device 310 in step 406. This process establishes a test call. Next, the process of checking the forward bit error rate after the test call is established will be described.

The time switch 301 of the base station 300 generates a bit pattern to be transmitted through the forward traffic channel, and proceeds to step 410 to transmit the pattern data as a radio signal through the traffic channel (TRFCH). In response, the terminal station 320 proceeds to step 412 and transmits it to the bit error rate detection unit 321 to measure the bit error rate. The bit error rate is measured and then transmitted to the bit error rate transmitter 323. The terminal station 320 then transmits the bit error rate information through the reverse signal channel (SGCH). When the base station 300 receives the received bit error rate information, the base station 300 proceeds to step 416 and transmits the bit error rate collecting unit 311 of the collecting device 310. Through this, the bit error rate of the forward link can be checked, and the operator can check the data received from the bit error rate collecting unit 311 on the screen.

Next, the process of checking the reverse bit error rate will be described. When the terminal station 320 checks the bit error rate of the forward link, the terminal station 320 proceeds to step 418 to control the bit error rate detector 321 to generate a bit pattern to be transmitted through the traffic channel of the reverse link. In operation 420, the data of the generated pattern is transmitted through the traffic channel TRFCH. Accordingly, the base station 300 transmits the data of the bit pattern received through the traffic channel to the time switch 301. In operation 422, the time switch 301 measures a bit error rate. In operation 424, bit error rate information is transmitted through a signal channel (SGCH). In operation 426, the reverse bit error rate is reported to the collection device 310. When the bit error rate is reported as described above, the collecting device 310 collects and outputs the bit error rate collecting unit 311 and transmits a signal for terminating the test call to the base station in step 428. Accordingly, when the test call ends in steps 430 to 432, the base station 300 notifies the collection device 310 of the test call in step 434.

In FIG. 5, the call release process is performed by the collecting apparatus. However, as described in addition to FIG. 2, the call is automatically blocked by the base station 300 or the terminal station 320 using a predetermined timer. Can be configured. In this case, it may be configured to notify the collection device that the call has ended, or may be configured not to notify.

In addition, although the collection device 310 is configured to be connected to the base station 300 in FIG. 5, it may be configured to connect to the base station controller. When connected to the base station controller as described above is configured to perform the operations performed by the base station 300 in the base station controller. And when the base station controller performs the above process, the base station 300 is configured to perform only a relay operation for transmitting data through a wireless environment.

As described above, in the wireless communication system, the call quality between the base station and the terminal is directly measured through the wireless channel, thereby enabling accurate measurement of the call quality. In addition, there is an advantage that can directly visually check the data of the call quality through the collection device in the wireless communication system.

Claims (6)

An apparatus for measuring call quality between a base station and a terminal of a wireless communication system, A test call controller for performing control according to a test call of a terminal station when a test call is started, terminated and a test call is performed; A collection device having at least an output unit for receiving the test call result data received from the terminal station and outputting the result data to the operator; A bit error rate detection unit for detecting a bit error rate by comparing bits of a predetermined pattern received through a forward traffic channel with data of a predetermined pattern, and generating a bit pattern to be transmitted through a reverse traffic channel; A test call monitoring unit for monitoring the status of the test call when the test call is being carried out, A terminal station having a bit error rate transfer unit for transmitting the bit error rate of the forward link to the base station to measure call quality; A time switch for generating a predetermined pattern to a traffic channel of the forward link and transmitting the predetermined pattern to the wireless channel, and detecting a bit error rate of the reverse link compared to a predetermined contracted bit pattern received to the traffic channel of the reverse link; An apparatus for measuring call quality between a base station and a terminal of a wireless communication system, characterized in that the base station includes a test call monitoring unit for monitoring a test call state of the base station while a test call is performed. An apparatus for measuring call quality between a base station and a terminal of a wireless communication system, A test call controller for performing control according to a test call of a terminal station when a test call is started, terminated and a test call is performed; A collection device having at least an output unit for receiving the test call result data received from the terminal station and outputting the result data to the operator; A bit error rate detection unit for detecting a bit error rate by comparing bits of a predetermined pattern received through a forward traffic channel with data of a predetermined pattern, and generating a bit pattern to be transmitted through a reverse traffic channel; A test call monitoring unit for monitoring the status of the test call when the test call is being carried out, A terminal station having a bit error rate transfer unit for transmitting the bit error rate of the forward link to the base station to measure call quality; A base station transferring data received from the terminal station to a base station controller, and transmitting data received from the base station controller to the terminal station; A time switch for generating a predetermined pattern to a traffic channel of the forward link and transmitting the predetermined pattern to the wireless channel, and detecting a bit error rate of the reverse link compared to a predetermined contracted bit pattern received to the traffic channel of the reverse link; An apparatus for measuring call quality between a base station and a terminal of a wireless communication system, characterized by comprising a base station controller having a test call monitoring unit for monitoring a test call state of a base station while a test call is performed. An apparatus for measuring call quality between a base station and a terminal of a wireless communication system, A test call controller for performing control according to the test call to the base station when the test call is started, terminated and the test call is performed; A collection device which receives and collects the result data of the test call received from the base station, and has at least an output unit for outputting to the operator and connected to the base station; A time switch for generating a predetermined pattern to a traffic channel of the forward link and transmitting the predetermined pattern to the wireless channel, and detecting a bit error rate of the reverse link compared to a predetermined contracted bit pattern received to the traffic channel of the reverse link; A base station having a bit error rate detector for detecting a bit error rate of a reverse link received from a time switch and transmitting the bit error rate to the collection device; A bit error rate detection unit for detecting a bit error rate by comparing bits of a predetermined pattern received through a forward traffic channel with data of a predetermined pattern, and generating a bit pattern to be transmitted through a reverse traffic channel; A test call monitoring unit that monitors the state of the test call when the test call is being carried out, An apparatus for measuring call quality between a base station and a terminal of a wireless communication system, characterized in that the terminal station performs a call quality measurement by including a bit error rate transmitter for transmitting the bit error rate of the forward link to the base station. An apparatus for measuring call quality between a base station and a terminal of a wireless communication system, A test call controller for performing control according to the test call to the base station when the test call is started, terminated and the test call is performed; A collection device which receives and collects the result data of the test call received from the base station, and has at least an output unit for outputting to the operator and connected to the base station controller; A time switch for generating a predetermined pattern to a traffic channel of the forward link and transmitting the predetermined pattern to the wireless channel, and detecting a bit error rate of the reverse link compared to a predetermined contracted bit pattern received to the traffic channel of the reverse link; A base station controller having a bit error rate detector for detecting a bit error rate of a reverse link received from a time switch and transferring the bit error rate to the collecting device; A base station transferring data received from the base station controller to a terminal station and transferring data received from the terminal station to the base station controller; A bit error rate detection unit for detecting a bit error rate by comparing bits of a predetermined pattern received through a forward traffic channel with data of a predetermined pattern, and generating a bit pattern to be transmitted through a reverse traffic channel; A test call monitoring unit that monitors the state of the test call when the test call is being carried out, An apparatus for measuring call quality between a base station and a terminal of a wireless communication system, characterized in that the terminal station performs a call quality measurement by including a bit error rate transmitter for transmitting the bit error rate of the forward link to the base station. In the method for measuring the call quality between the terminal station and the base station is connected to the collecting device to the terminal station, When the test call is established, the base station generates a predetermined bit pattern for transmission on the forward link and transmits the bit pattern to the terminal station through a forward traffic channel; Checking, by the terminal station, the bit error rate of the received bit pattern data to the base station, and notifying a forward bit error rate to the collecting device; When the checking of the error rate of the forward link is finished, the terminal station generates a bit pattern of a reverse link previously agreed to the base station and transmits the bit pattern to the base station through a reverse traffic channel; When the base station receives the reverse bit pattern data, checking the bit error rate of the reverse link and transferring the bit error rate to the terminal station; And receiving the received bit error rate data by the terminal station and transmitting the received bit error rate data to the collection apparatus. In the method for measuring the call quality between the terminal station and the base station connected to the collecting device to the base station, When the test call is established, the base station generates a predetermined bit pattern for transmission on the forward link and transmits the bit pattern to the terminal station through a forward traffic channel; Checking, by the terminal station, the bit error rate of the received bit pattern data to the base station, and notifying a forward bit error rate to the collecting device; When the checking of the error rate of the forward link is finished, the terminal station generates a bit pattern of a reverse link previously agreed to the base station and transmits the bit pattern to the base station through a reverse traffic channel; When the base station receives the reverse bit pattern data, checking the bit error rate of the reverse link and transferring the bit error rate to the terminal station; And receiving the received bit error rate data by the terminal station and transmitting the received bit error rate data to the collection apparatus.