KR20000055949A - Radio Interface Unit of PC card type WLL system - Google Patents

Abstract

PURPOSE: A radio interface unit(RIU) of a wireless local loop(WLL) system is provided to supply combined services such as data communication services under a personal computer(PC) environment, by configuring the RIU as a card type to directly insert the RIU into a PC slot. CONSTITUTION: A radio interface unit(RIU) of a personal computer(PC) card-type wireless local loop(WLL) system, comprises a radio frequency(RF) unit(10), a low pass filter(LPF)(21), an analog to digital(A/D) converter(22), a digital to analog(D/A) converter(23), a code division multiple access(CDMA) modem(24), a timing/switching controller(25), a personal computer(PC) bus interface(27), a vocoder(28), combos(29-1,2), and serial line interface circuits(SLICs)(30-1,2). The RF unit connected to a base station converts an RF signal of the base station into an intermediate frequency(IF) signal, or converts analog IF signals of subscribers into RF signals. The LPF passes required band analog IF signals to input/output the analog IF signals. The A/D converter converts the analog IF signals of the LPF into digital data. The D/A converter converts the digital data into analog IF signals to output the signals to the LPF. The CDMA modem decodes and despreads the digital data to convert the data into baseband signals, or encodes and band-spreads the converted baseband digital data to output the data to the D/A converter. The PC bus interface interfaces with a PC bus, and outputs 64Kbps pulse code modulation(PCM) data related to the data communication services to the timing/switching controller through the data process/main controller. The vocoder demodulates 32Kbps digital data of the base station into 64Kbps digital data or modulates 64Kbps PCM data of the subscribers into 32Kbps digital data to output the data to the timing/switching controller. The combos convert the 64Kbps PCM digital data into analog signals, or convert analog signals into the 64Kbps PCM digital data to output the data to the vocoder. The SLICs perform impedance matching processes for the analog signals to output the signals to telephones, facsimile telegraphs or integrated service digital network(ISDN) telephones of the subscribers. The SLICs perform impedance matching processes for analog signals of the subscribers, and output the signals to the combos.

Description

Subscriber matching device for personal computer card type wireless subscriber network system {Radio Interface Unit of PC card type WLL system}

According to the present invention, a personal interface device is constructed by configuring a subscriber interface device (Radio Interface Unit; hereinafter referred to as 'RIU') of a wireless local loop (WLL) system in a card type. A personal computer (hereinafter referred to as a 'PC') inserts a slot into a PC card-type WLL system for providing integrated services such as telephone and fax services as well as data communication services in a PC environment. will be.

In general, the WLL system is a system that forms a link from a telephone company to a subscriber terminal by using a wireless system instead of a wired line. The WLL system has a low installation and maintenance cost per subscriber compared to a conventional wired network, thereby enabling a short-term network configuration. In addition, it is expected to play an important role in the construction of the information infrastructure in the future because it is easy to maintain.

The WLL system is largely composed of a RIU for constructing a radio link with a base station, a base station for making a radio link with the RIU, and a base station controller and a telephone exchange for controlling the base station.

Conventionally, the RIU is configured in the form of a set-top box as shown in FIG. 1, and the WLL RIU 1 includes a DM (Display Monitor) 2 for performing a monitoring operation and displaying the same. Adapter (3) required for power supply and multiple telephones or faxes, integrated service digital network (ISDN) telephones, and PCs (4) for data communication services are connected to provide various telephone and fax services and data communication services. Will be performed.

On the other hand, recently, due to the improvement of the performance of the PC 4 and the development of a communication network, the Internet, electronic commerce, home banking, home shopping, etc. through PC communication have become common, and home automation, Telecommuting, home offices, etc. are becoming more and more common, and it is necessary to be able to perform data communication services as well as telephone and fax services provided by RIU of WLL system through PC environment.

That is, conventionally, in order to perform data communication in a PC using the WLL RIU 1, a separate cable and modem for connecting the WLL RIU 1 and the PC 4 are required.

The present invention has been made in view of the above, and the object thereof is that instead of using a conventional telephone network or a digital line network, the RIU of the WLL system is configured as a card type and directly inserted into a slot of a PC, thereby providing a telephone and fax service. Of course, it is to provide RIU of PC Card type WLL system that can provide integrated service such as data communication service in PC environment.

1 is a view showing a case in which a subscriber matching device of a conventional wireless subscriber network system is used in the form of a set-top box,

2 is a view showing a case in which a subscriber matching device of a wireless subscriber network system according to the present invention is used as a card type in a personal computer;

Figure 3 is a block diagram of a subscriber registration device of a personal computer card type wireless subscriber network system according to the present invention.

<Explanation of symbols for main parts of drawing>

20: PC Card type WLL RIU 21: LPF

22: A / D converter 23: D / A converter

24: CDMA modem unit 25: timing / switching control unit

26: data processing and main control unit 27: PC bus interface unit

28: Vocoder 29-1,2: Combo part

30-1,2: Slick part

The RIU of the PC card type WLL system of the present invention for achieving the above object is, except for the RF unit, a PC bus interface unit for interfacing with a PC, a data process for processing data for data communication services and supporting various communication protocols. And adding a main control unit to configure the RIU into a card type, inserting the RIU directly into a slot of a PC, and then performing data processing between the base station and the PC in the LPF, A / D conversion unit, and D / A conversion unit in the RIU. Through the CDMA modem unit, timing / switching control unit, data process and main control unit, PC bus interface unit, and perform data processing between the base station and the telephone or fax machine in the LPU, A / D converter, and D / A converter in the RIU. , CDMA modem unit, vocoder, combo unit, slick unit to perform integrated services such as telephone and fax services as well as data communication services can be provided in the PC environment Characterized in that the rock.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the RIU of the PC card-type WLL system according to the present invention.

FIG. 2 is a diagram illustrating a case in which a RIU of a WLL system according to the present invention is used as a card type in a PC. IF is a radio frequency (RF) signal received from a base station by wireless connection with a base station (not shown) of the WLL system. (Intermediate Frequency) signal or RF unit 10 for converting an analog IF signal input from the subscriber side into an RF signal, and is connected to the RF unit 10, connected to a telephone or fax, ISDN telephone It is composed of a PC card type WLL RIU 20 to perform a telephone and fax service through, and to perform a data communication service through a connection with a PC, wherein the PC card type WLL RIU 20 is inserted into a slot of the PC Structure.

3 is a block diagram of a RIU of a PC card type WLL system according to the present invention, and a low pass filter for inputting and outputting only signals of a desired band among analog IF signals input and output connected to the RF unit 10. And an analog / digital (A / D) conversion unit 22 for converting an analog IF signal output through the LPF 21 into digital data. A D / A converter 23 that converts digital data into an analog IF signal and outputs the LPF 21 to the LPF 21, and decodes and decodes the digital data converted by the A / D converter 22. Code Division Multiple Access (CDMA) modem unit for spreading and converting the baseband signal into baseband signals, or for encoding and spreading the input baseband digital data and outputting the same to the D / A converter 23 ( 24) and supply the necessary reference timing signals to the various building blocks in the RIU. The timing / switching controller for switching the baseband digital data decoded by the CDMA modem unit 24 to the corresponding path or outputting the converted baseband digital data to the CDMA modem unit 24. And a data processor and main controller 26 for controlling the operation of the timing / switching control unit 25, processing data for a data communication service, and supporting various communication protocols, and being inserted into a slot of a PC. A PC bus interface unit 27 which performs an interface with a PC bus and outputs 64 Kbps PCM data related to a data communication service on a PC to the timing / switching control unit 25 through the data processor and main controller 26; The 32Kbps digital data from the base station switched and input by the timing / switching control unit 25 is 64Kbps of pulse code modulation (PCM). A vocoder 28 which demodulates digital data or modulates 64 Kbps PCM digital data input from the subscriber side into 32 Kbps digital data and outputs the same to the timing / switching control unit 25 and the vocoder 28 in the vocoder 28. A combo unit 29-1, 2 for converting the demodulated 64 Kbps PCM digital data into an analog signal or converting the input analog signal into 64 Kbps PCM digital data and outputting it to the vocoder 28; The combo unit 29-1, 2 outputs the impedance matched analog signal converted to the subscriber-side telephone, fax or ISDN telephone, or the analog signal input from the subscriber-side telephone, fax or ISDN telephone is impedance-matched. It consists of the slick (SLIC) part 30-1, 2 which outputs to (29-1, 2).

The operation of the RIU of the PC card type WLL system configured as described above is as follows.

First, a process of transmitting data from a subscriber phone or fax to a base station and a process of transmitting data from a base station to a subscriber phone or fax to perform a telephone and fax service will be described.

The subscriber's analog signal, i.e., the transmission signal of the subscriber's telephone, the fax or the ISDN telephone, is impedance-matched by the slick units 30-1 and 2 and then output to the combo units 29-1 and 2.

Then, the combo unit 29-1, 2 converts the input analog signal into 64Kbps PCM digital data and outputs it to the vocoder 28.

Subsequently, the vocoder 28 modulates the digital data of the input 64Kbps PCM into 32Kbps digital data under the control of the data processor and the main controller 26 and outputs the digital data of the 32Kbps to the timing / switching controller 25.

Thereafter, the timing / switching controller 25 switches the 32 Kbps digital data converted by the vocoder 28 to a time slot selected by the vocoder 28 and outputs the same to the CDMA modem unit 24.

Accordingly, the CDMA modem unit 24 encodes and spreads 32 Kbps of digital data input through switching of the timing / switching control unit 25 under the control of the data processor and the main controller 26 to perform D / A. The D / A converter 22 converts the encoded digital data into an analog IF signal, and then passes through a filter process of the LPF 21 to the RF unit 10. Output

Then, the RF unit 10 converts the analog IF signal passing through the LPF 21 into an RF signal and transmits the RF signal to the base station.

On the contrary, the process of receiving data from the base station and transmitting the data to the subscriber-side telephone, fax, or ISDN telephone will be described. The RF unit 10 receives the RF signal from the base station and converts it into an IF signal, followed by the LPF 21. After the filter process, the A / D converter 22 converts the digital data into 32 Kbps and outputs the data to the CDMA modem unit 24.

Then, the CDMA modem unit 24 decodes and band-despreads the converted 32 Kbps digital data under the control of the data processor and main controller 26 and outputs the decoded and despread signal to the timing / switching control unit 25.

Thereafter, the timing / switching controller 25 switches the decoded 32 Kbps digital data to a predetermined time slot of each subscriber and outputs the decoded digital data to the vocoder 28.

Subsequently, the vocoder 28 demodulates 32 Kbps digital data input through switching of the timing / switching control unit 25 into 64 Kbps PCM digital data under the control of the data process and the main controller 26. Output to negatives 29-1,2.

Accordingly, the combo unit 29-1 and 2 converts the 64 Kbps PCM digital data demodulated by the vocoder 28 into an analog signal and outputs the analog data to the slick unit 30-1, 2, followed by the slick unit 30. In (1,2), the input analog signal is matched with impedance and output to the subscriber's telephone, fax or ISDN telephone.

Next, a process of transmitting data from the subscriber side PC to the base station and a process of transmitting data from the base station to the subscriber side PC to perform the data communication service will be described.

The PC bus interface unit 27 inputs 64 Kbps PCM digital data output from the subscriber side PC under the control of the data processor and the main controller 26, and outputs the digital data to the timing / switching control unit 25.

Subsequently, the timing / switching control unit 25 switches the input 64 Kbps PCM digital data to the corresponding time slot and outputs the same to the CDMA modem unit 24.

Accordingly, the CDMA modem unit 24 encodes and spreads the 64 Kbps PCM digital data under the control of the data processor and the main controller 26, and outputs the digital data to the D / A converter 22, followed by D / A. The A converter 22 converts the encoded digital data into an analog IF signal, and then outputs the RF data to the RF unit 10 after the LPF 21 is filtered.

Then, the RF unit 10 converts the analog IF signal passing through the LPF 21 into an RF signal and transmits the RF signal to the base station.

On the contrary, when the process of receiving data from the base station and transmitting the data to the subscriber side PC, the RF unit 10 receives the RF signal from the base station, converts it into an IF signal, and then passes the filter process of the LPF 21. Next, the A / D conversion section 22 converts the data into 64 Kbps PCM digital data and outputs the same to the CDMA modem section 24.

Then, the CDMA modem unit 24 decodes and despreads the converted 64Kbps PCM digital data under the control of the data processor and main controller 26, and then the time set in advance by the timing / switching control unit 25. Switch to the slot and output to the PC bus interface 27.

Subsequently, the PC bus interface unit 27 outputs 64 Kbps PCM digital data input through switching of the timing / switching control unit 25 to the subscriber side PC.

As described above, the present invention does not use a conventional telephone network or a digital line network, and configures the RIU of the WLL system into a card type and directly inserts the slot into the slot of the PC so that the telephone and fax services are integrated services such as a data communication service PC. It can be provided in the environment, and in particular, it is possible to implement a virtual telephone function or a virtual fax function in software using a speaker, a microphone, and a sound card in a PC.

Claims (1)

It is connected to the base station of the WLL system and converts the RF signal received from the base station into an IF signal, or is connected to the RF unit 10 for converting an analog IF signal input from the subscriber side into an RF signal, and among the analog IF signals input and output LPF 21 for inputting and outputting only signals of a desired band, A / D converter 22 for converting analog IF signals output through the LPF 21 into digital data, and inputted digital data as analogues. D / A converter 23 for converting to IF signal and outputting to LPF 21 and digital data converted by A / D converter 22 to decode and band despread to baseband signal. Or the CDMA modem unit 24 for encoding and spreading the baseband digital data to be input to the D / A converting unit 23 and supplying the necessary reference timing signals to various building blocks in the RIU. CDMA Module A timing / switching control unit 25 for switching the baseband digital data decoded by the unit 24 to a corresponding path or outputting the baseband digital data by switching the baseband digital data to the CDMA modem unit 24; A data processor and main controller 26 for controlling the operation of the timing / switching controller 25, processing data for a data communication service, and supporting various communication protocols, and an interface with a PC bus as it is inserted into a slot of a PC. A PC bus interface unit 27 for outputting 64 Kbps PCM data related to a data communication service on a PC to the timing / switching controller 25 through the data processor and main controller 26, and the timing / switching. 32 Kbps digital data from the base station switched and inputted by the control unit 25 is demodulated or subscribed to 64 Kbps PCM digital data. The vocoder 28 that modulates the 64Kbps PCM digital data input from the side into 32Kbps digital data and outputs it to the timing / switching control unit 25 and the 64Kbps PCM demodulated by the vocoder 28 are analog signals. Combo units 29-1 and 2 for converting the analog signal to the digital data of 64 Kbps PCM and outputting to the vocoder 28 and the analog signals converted by the combo units 29-1 and 2 A slick unit for impedance matching and outputting signals to subscriber side telephones, fax machines, and ISDN telephones, or analog signals inputted from subscriber side telephones, fax machines, and ISDN telephones, and outputting them to the combo units 29-1 and 2. 30-1, 2) subscriber registration device of a personal computer card type wireless subscriber network system, characterized in that inserted into the slot of the PC.