KR100302331B1 - A device and a method of testing bit error rate for wll - Google Patents

Abstract

The present invention relates to a W-CDMA wireless subscriber network (WLL), in particular, by performing a BER test using a subscriber radio access device (RIU), to determine and improve the signal transmission characteristics or call quality of the wireless subscriber network, The present invention relates to an apparatus and a method for allowing a maximum number of subscribers to be accommodated in one cell of a wireless subscriber network. In the subscriber wireless access device for a wireless subscriber network, each part of a subscriber wireless access device is controlled and held. A control unit for outputting a test pattern of one of a plurality of test patterns, and a bit in which the two signals do not coincide by adding a synchronization signal to a test pattern signal to be transmitted under control of the control unit, and detecting a synchronization signal of the received test pattern signal A synchronization and error detection unit for calculating an error rate, and a test pattern signal to be transmitted from the synchronization and error detection unit A framer for converting and outputting the structure, a first modem for channel coding and spreading the test pattern signal to be transmitted from the framer, and outputting the inverse channel coding and spreading to the framer. It is characterized by consisting of a second modem.

Description

Apparatus and method for testing bit error rate of wireless subscriber network {A DEVICE AND A METHOD OF TESTING BIT ERROR RATE FOR WLL}

The present invention relates to a Wide-Band Code Division Multiple Access (W-CDMA) type Wireless Local Loop (WLL), and more particularly, to a BER (Beat Error) using a Radio Interface Unit (RIU). The present invention relates to an apparatus and a method for determining and improving signal transmission characteristics or call quality of a wireless subscriber network and accommodating a maximum number of subscribers in one cell of the wireless subscriber network.

In general, a wireless subscriber network (WLL) system is a system that wirelessly replaces a certain portion of a wired communication line section between a conventional public telephone network or a public switching telephone network (PSTN) and a general subscriber. The W-CDMA WLL system is applied to this system.

As mentioned above, the attempt to change the fixed landline between the public subscriber telephone and the public telephone network to the wireless system was made in the early 1970s by Bell RAB in the United States. Although it was originally devised as a way to reduce telecommunication line provisional equipment, it was not easy to secure radio frequency for many subscribers at the time, and the cost of manufacturing and installing radio transceivers including antennas is not cheaper than that of wired communication lines. However, it has not reached the stage of commercialization and commercialization.

However, in the mid-1990s, with the rapid development of electronic communication technology, economical wireless communication products continue to be introduced to the market through various manufacturers, and communication service providers have shown much interest in commercializing the wireless subscriber network. It became.

In particular, it is easier to install a communication network than a wired communication line, costs less to expand the facility, and is very flexible to design and change the network according to the increase of subscribers, and to easily connect the communication network anywhere in the area where radio waves can reach. The benefits of building are of interest to telecom service providers.

As a technique used in the wireless communication method of the wireless subscriber network as described above, a method using a satellite, a method using a microwave, a method using a cellular technology, a cordless method, a W-CDMA And the like.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless subscriber network (WLL) system using the W-CDMA scheme. When a particular subscriber radio access device (RIU) among the systems configuring the wireless network has a high bit error rate (BER), a smooth call In order to maintain the power, the power is increased beyond the regulation, so that other radio access devices (RIUs) in the same cell increase the power in the same way to avoid the interference caused by the high power and to maintain the call. . Therefore, the number of wireless access units (RIUs) that can be used in one cell is reduced, call quality is lowered, and the efficiency of the wireless subscriber network system is lowered.

Hereinafter, a bit error rate test apparatus for a wireless subscriber network according to the prior art will be described with reference to the accompanying drawings.

1 is a functional block diagram constituting a general wireless subscriber network system, Figure 2 is a detailed functional block diagram of a subscriber radio access device according to an embodiment of the prior art.

Referring to the accompanying drawings, the wireless subscriber network according to the general technology, the subscriber wireless access device (RIU) 20 is connected to the individual terminal 10 of each subscriber via a wire,

A cell having a cell, which is a predetermined service area, is wirelessly connected to the subscriber radio access device 20 within the cell area to connect or disconnect a bearer, which is a communication channel (CH). A base station (RP: Radio Port) 30,

A radio base controller (RPC) 40 which is wirelessly connected to a plurality of the wireless base stations 30 and performs a call link between a subscriber of a wireless subscriber network and a subscriber of another communication network system;

A central control unit (NMS) (50) connected to the base station coordinator (40) to control and maintain the entire wireless subscriber network (WLL);

It consists of a public switched telephone network (PSTN) with a function of switching so that other communication network subscribers that are call-linked with the radio base station coordinator 40 are connected.

In the above-described configuration, the subscriber radio access device (RIU) 20 according to the related art is a telephone or personal computer (PC) or fax (FAX) that is the subscriber terminal 10, as shown in FIG. A subscriber interface 21 connected to the back and the like,

The data connection unit 23 is formed of a PGA (Programmable Gate Array) for smooth data connection between the subscriber access unit 21 and the control unit 29, and also controls seamless data connection between the control unit 29 and other functional units. ,

A modem unit 25 for generating and spreading a pseudo noise (PN) code of a W-CDMA method;

A high frequency unit 27 for modulating and transmitting data spread by a W-CDMA PN code into a specific high frequency signal;

It consists of a control unit 29 for controlling the entire subscriber radio access device.

Hereinafter, the detailed operation and effect of the wireless subscriber network bit error rate test apparatus according to the prior art of the above configuration will be described with reference to the accompanying drawings.

The subscriber access unit 21 of the subscriber radio access device 20, which has received a data signal to communicate with the unique number of the called party from the subscriber terminal 10, is capable of processing the input signal in the subscriber access device 20. After converting the data into a specific time slot and data frame by the W-CDMA method under the control of the control unit 29 in the data connection unit 23, the modem unit 25 To apply.

The modem unit 25 spreads the channel coding (CH Coding) and the specific PN code to recover or recover an error from the data, and then applies it to the high frequency unit 27.

The high frequency unit 27 converts the applied data signal into a specific frequency and a constant output of the W-CDMA system, transmits the signal through an antenna, and receives and repeats the above reverse process.

The wireless base station 30, which has established a call from the subscriber radio access device 20 through the signal channel and receives a data signal through the traffic channel, bears a specific communication channel. ) Process the channel to be connected.

The wireless base station coordinator 40, which receives data from the wireless base station 30 through the corresponding channel, reports the current situation to the centralized control device 50 and simultaneously transmits the corresponding unique number and data of the called party to the public telephone network. By applying to 60, communication is made.

As described above, in the conventional wireless subscriber network (WLL), when the W-CDMA wireless signal generated by the subscriber radio access device 20 has a high BER rate due to a failure or the like, communication does not proceed smoothly. In order to continue communication at high BER, the output had to be high.

Thus, the other subscriber radio access device 20 within the cell area of the radio base station 30 is induced with noise, and the same output is raised to maintain communication.

Therefore, all other normal subscriber radio access devices 20 should generate a high output by one subscriber radio access device 20 which generates a high output due to a failure in the cell area of the radio base station 30. There is a problem of limiting the performance of the system by lowering the call quality of the own network and limiting the number of subscriber radio access devices 20 acceptable to the radio base station 30.

In order to identify the impaired subscriber wireless access device as described above, the user or operator's hearing, or using a separate BER measuring instrument, as an embodiment, corresponds to about 100 per wireless base station 30 There was a problem that each subscriber wireless access device 20 has to be individually measured and confirmed while traveling the site.

The present invention is to transmit the test pattern in the subscriber radio access device of the wireless subscriber network, and again calculates the BER by comparing the test pattern received and transmitted from the subscriber radio access device and the received test pattern, thereby causing the subscriber radio failure It is an object of the present invention to provide an apparatus and method for easily identifying a connecting apparatus.

In order to achieve the above object, the present invention provides a subscriber wireless access device for a wireless subscriber network, which controls each part of a subscriber wireless access device and outputs a test pattern of one of a plurality of test patterns held. And a synchronization and error detection unit for adding a synchronization signal to a test pattern signal to be transmitted under control of the controller and detecting a synchronization signal of the received test pattern signal to calculate a bit error rate at which the two signals do not match. A framer for converting and outputting a test pattern signal to be transmitted from the synchronization and error detection unit into a frame structure having a predetermined size, and a first modem for channel coding, spreading and outputting the test pattern signal to be transmitted from the framer; And a second modem for reverse channel coding and spreading the received test pattern signal to the framer. Characterized in that the bit error rate measuring apparatus of the wireless subscriber network composed of

In addition, a mode setting process for setting the subscriber radio access device to the bit error rate measurement mode, a test pattern selection process for selecting one of a plurality of test patterns of the control unit, the first channel and the second channel of the subscriber radio access device The call connection process for making the call connection, the bit error rate calculation process for calculating the difference bits by comparing the bits of the transmission test pattern and the reception test pattern, and the bit error rate according to the above process are transmitted to the centralized control device. It is characterized by the method of testing the bit error rate of the wireless subscriber network, which consists of an output process of notifying and outputting through the display device.

1 is a functional block diagram constituting a general wireless subscriber network system,

2 is a detailed functional block diagram of a subscriber radio access device according to an embodiment of the prior art;

3 is a functional block diagram of a subscriber radio access device according to an embodiment of the present invention;

Figure 4 is a flow chart for the bit error rate test method of a wireless subscriber network according to the present invention.

Explanation of symbols on the main parts of the drawings

10: subscriber terminal 20: subscriber wireless access device

21,71,72: subscriber connection 23: data connection

25,76,77: modem portion 27: high frequency portion

29,79: control unit 30: radio base station

40: radio base station controller 50: centralized control device

60: public telephone network 73: switch

74: synchronization and error detection unit 75: framer

Hereinafter, with reference to the accompanying drawings will be described an apparatus and method for testing bit error rate of a wireless subscriber network according to the present invention.

Figure 3 is a functional block diagram of a subscriber radio access device according to an embodiment of the present invention, Figure 4 is a flow chart for a bit error rate test method of a wireless subscriber network according to the present invention.

Referring to the bit error rate test apparatus of the wireless subscriber network according to the present invention with reference to the accompanying drawings as described above, the first connected to the subscriber terminal 10 to convert to digital data that can be processed by the subscriber wireless access device And second subscriber connection (71, 72),

The first and second subscriber connection portions 71 and 72 are connected to each other via a switch 73. The synchronization signal is added to the applied signal or the transmission test pattern, and the synchronization signal of the received test pattern signal is detected and transmitted. A synchronization and error detection unit 74 for calculating and outputting a bit error rate (BER) by calculating the number of different bits compared to the test pattern signal,

A framer 75 configured to output a signal output from the synchronization and error detection unit 74 to a frame having a predetermined shape, and to output the frame;

PN codes of channel coding and W-CDMA scheme for recovering errors from signals received from the first and second subscribers 71 and 72 through the synchronization and error detector 74 and the framer 75, respectively First and second outputs to the mixing unit 78 by spreading to the mixing unit 78 and outputting the signal applied from the mixing unit 78 to the framer 75 by performing reverse channel coding and reverse spreading. Modem section 76, 77,

A high frequency unit 27 for modulating and demodulating a signal applied through the mixing unit 78 at a frequency suitable for communication of a wireless subscriber network of a W-CDMA system, and transmitting and receiving the signal through an antenna;

A control unit 79 controls each unit of the subscriber radio access device 20 according to the present invention and provides necessary data.

In addition, the mode setting step (S10) of controlling the control unit 79 of the subscriber radio access device 20 according to the present invention to set to operate in the bit error rate (BER) measurement mode (Mode),

One of a plurality of test patterns recorded and stored in the controller 79 is selected and output, and the test pattern output by controlling the switch 73 is synchronized and error detector 74. Test pattern selection process (S20) to be applied to),

A call connection process (S30) of controlling a wireless subscriber network so that a first channel and a second channel of the subscriber radio access device having the two (2) channels are connected to each other;

A bit error rate calculation process (S40) for comparing the bits Bit of the transmission test pattern and the reception test pattern to calculate the number of bits having different differences from each other and to notify the control unit 79;

An output process (S50) for notifying the centralized control device (NMS: Network Management System) of the above-mentioned process (S40) and outputting the displayed error to the display device for display by the operation maintenance personnel. do.

Hereinafter, a wireless subscriber network bit error rate test apparatus and method thereof according to the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

Under the control of the operating personnel in the centralized control unit (NMS) 50 of the wireless subscriber network, the control unit 79 of the corresponding subscriber radio access device 20 to be tested BER is set to the BER test mode (S10). ).

The control unit 79 receiving the control signal controls the switch 73 so that the input terminal of the synchronization and error detection unit 74 is disconnected from the first and second subscriber connection units 71 and 72. It is connected to the control unit 79.

In addition, one test pattern among a plurality of test pattern signals recorded and stored in the controller 79 is selected by a control signal applied from the centralized control device (NMS) 50 (S20). The selected test pattern is applied to one of the two channels of the synchronization and error detection unit 74 from the control unit 79 through the switch 73.

At this time, one of the two channels of the subscriber radio access device is a transmission channel, the other is a reception channel, that is, as an embodiment, the channel 1 is a transmission channel under the control of the centralized control device 50 Channel 2 is allocated to the reception channel, and a control signal for connecting the call to each other is applied to each functional unit of the wireless subscriber network (S30).

The synchronization and error detection unit 74 adds a synchronous signal to the applied test pattern, and when applied to the framer 75, processes the frame so that data of an appropriate bit size is obtained. The controller 79 is then applied to the first modem 76 of the selected channel.

The modem 76 recovers an error that may have occurred during the processing, spreads the WN-CDMA PN code, and then supplies the high frequency unit 27 through the mixing unit 78. It is applied to the antenna through high frequency processing which is applied, modulated at a specific frequency, and amplified.

The high frequency test pattern signal is applied to the radio base station 30, and after performing normal internal processing, passes through the radio base station 40 again to the radio base station 30 and the antenna of the subscriber radio access device 20. It is applied to the high frequency portion 27 through.

The high frequency unit 27 demodulates and applies the demodulation unit 78 to the second modem unit 77 designated as the receiving unit through the mixing unit 78, and the modem unit 77 performs reverse spreading and channel coding. After the reception test pattern is detected, it is applied to the framer 75.

When the framer 75 realigns the frame unit and applies the synchronization and error detection unit 74, the framer 75 detects the synchronization signal from the received test pattern signal, and then matches the transmission test pattern signal based on the synchronization signal. After sorting, the error is detected and the BER is calculated by comparing whether or not each bit is the same (S40).

When the detected BER is applied to the control unit 79, the control unit notifies the central control unit (NMS) again, and displays it through the display unit (S50). Immediately, dispatch to the site and carry out work such as repair or repair.

In the above description of the operation, the same parts as in the prior art have been avoided from possible overlap.

Therefore, as a test pattern processing more accurate than the hearing of the person, it is possible to check the failure of the subscriber radio access device (RIU) 20, the operator visits the site in which the plurality of subscriber radio access devices are installed. Therefore, the fault generating device can be easily and quickly identified by the central control unit (NMS) without the BER test.

In addition, it is possible to immediately repair and repair a failed subscriber radio access device (RIU), so that the maximum number of subscribers can be continuously accommodated within the area serviced by one radio base station 30, and the call quality can be kept constant. By maintaining it, the reliability of the wireless subscriber network (WLL) is improved.

The present invention having the above-described configuration can improve the call quality by making it possible to easily calculate an accurate BER and easily identify a faulty subscriber radio access device that increases the BER and degrades the call quality.

In addition, since the BER can be kept low from each subscriber radio access device of the subscriber network, the maximum subscriber per cell can be maintained and the reliability of the system can be improved.

Claims (3)

A subscriber radio access device for a wireless subscriber network, A control unit which controls each unit of the subscriber wireless access device and outputs one test pattern among a plurality of test patterns held; A synchronization and error detection unit for adding a synchronization signal to a test pattern signal to be transmitted under the control of the controller and detecting a synchronization error of the received test pattern signal to calculate a bit error rate at which the two signals do not match; A framer for converting and outputting a test pattern signal to be transmitted from the synchronization and error detection unit into a frame structure having a predetermined size; A first modem for channel coding, spreading, and outputting a test pattern signal to be transmitted from the framer; And a second modem for reverse channel coding and spreading the received test pattern signal and outputting the received test pattern signal to the framer. According to claim 1, And the subscriber radio access device accommodates two channels. A mode setting process of setting a subscriber radio access device to a bit error rate measurement mode; A test pattern selection process of selecting one of a plurality of test patterns of the controller; A call connection process for allowing a first channel and a second channel of the subscriber radio access device to be connected; A bit error rate calculation process of comparing bits of a transmission test pattern and a reception test pattern to calculate a difference bit; And an output process of notifying the centralized control device of the bit error rate by the above process and outputting the same through the display device.