KR100329550B1 - Multimedia service application system for communication terminal in the IMT-2000 system - Google Patents

Abstract

An object of the present invention is to provide a multimedia service support system for communicating with an IMT-2000 system terminal for supporting multimedia services by accessing a B-ISDN network, which is an ATM network, by a wired network in order to transmit a large amount of data at high speed. As described above, the present invention has the effect of supporting data, voice and video services up to 2Mbps, unlike conventional cellular systems or PCS that support only voice services.

Description

Multimedia service application system for communication with IMT-2000 system terminal {Multimedia service application system for communication terminal in the IMT-2000 system}

The present invention relates to a multimedia service support system for communicating with an IMT-2000 system terminal, and in particular, IMT-2000 for supporting multimedia services by accessing a B-ISDN network, which is an ATM network, by a wired network in order to transmit a large amount of data at high speed. A multimedia service support system for communicating with a system terminal.

1A and 1B show a block diagram of a conventional cellular system or PCS system.

FIG. 1A shows a schematic block diagram of a terminal used in a conventional cellular system or PCS system, and FIG. 1B shows a block diagram of a system for communicating with the terminal of FIG. 1A.

As shown in FIG. 1A, a terminal used in a conventional cellular system or a PCS system includes a voice input / output unit 1 for converting an analog input signal into a PCM output signal and a PCM input signal into an analog output signal. After modulating the vocoder 2, which is a voice codec device for coding the PCM signal converted by the voice input / output unit 1 or decoding the demodulated voice data, and the voice data coded by the vocoder 2, The baseband / RF processing unit 3 is configured to process and transmit the signal via the antenna ANT, or to perform high frequency processing on a voice signal received through the antenna ANT.

As shown in FIG. 1B, a system for communicating with a conventional terminal demodulates a voice signal received by an antenna ANT or modulates vocoded voice data, and then an RF processor (not shown) and an antenna ANT. And a vocoder bank 6 provided in the base station controller 5 which sequentially transmits through the base station 4, and decodes the voice data demodulated by the base station 4 into PCM data or codes PCM data. And a circuit switch 7 for converting the PCM data decoded in the vocoder bank 6 into an analog signal or converting an input analog voice signal into PCM data.

When the voice signal transmission and reception process of the conventional cellular system or PCS system configured as described above will be described in detail.

First, a process of transmitting a voice signal from a terminal to a telephone of a general home will be described.

When a voice signal is input to the voice input / output unit 1, the voice input / output unit 1 digitizes the voice signal into a PCM signal of 64 Kbps and provides it to the vocoder 2. The vocoder 2 converts the provided 64 Kbps PCM signal into a compressed speech signal of 8 Kbps (8K QCELP or EVRC) or 13.35 Kbps (13KQCELP) according to the vocoder algorithm, as shown in Figs. 2A and 2B. 12 bits of cyclic redundancy check (CRC) and 8 bits of encoder tail (encoder tail) are added to the compressed 8Kbps or 13.35Kbps compressed voice signal to convert the frame into 9.6Kbps or 14.4Kbps frame.

The voice signal having a 9.6 Kbps or 14.4 Kbps frame converted by the vocoder 2 is modulated by a modem, which is a baseband processing apparatus 3, is subjected to high frequency processing through an RF processing apparatus, and then transmitted through an antenna ANT. do.

When the transmitted voice signal is received by the base station 4 via the antenna ANT shown in FIG. 1B, the base station 4 demodulates the received voice signal and transmits it to the base station controller 5. The vocoder 6 provided in the base station controller 5 decodes the transmitted 9.6 Kbps or 14.4 Kbps frame voice signal and converts it into a 64 Kbps PCM signal. The converted 64 Kbps PCM signal is exchanged to the telephone of a general household via the circuit switch 7.

Next, the call process from the home phone to the terminal will be described.

The analog signal received at the home telephone is converted into a PCM signal at the circuit switch 7 and then exchanged. The PCM signal is vocoded at 9.6 Kbps or 14.4 Kbps in the vocoder 6 provided in the base station controller 5 and then transmitted to the base station 4. The base station 4 modulates the transmitted voice signal and then transmits the signal through an RF processor (not shown) and an antenna ANT.

The baseband / RF processing unit 3 in the terminal performs a high frequency processing on the modulated signal received by the antenna ANT and demodulates it to provide a 9.6 Kbps or 14.4 Kbps frame audio signal to the vocoder 2. The vocoder 2 converts the demodulated signal provided from the baseband / RF processing section 3 into a 64 Kbps PCM signal. The 64 Kbps PCM signal is converted into an analog signal through the voice input / output unit 1 and output.

Hereinafter, the call process between the terminal and the terminal will be described.

When a voice signal is input to the voice input / output unit 1, the voice input / output unit 1 digitizes the voice signal into a PCM signal of 64 Kbps and provides it to the vocoder 2. The vocoder 2 converts the provided 64 Kbps PCM signal into a compressed speech signal of 8 Kbps (8K QCELP (Qualcomm Code Exited LPC or EVRC) or 13.35 Kbps (13K QCELP)) according to the vocoder algorithm, as shown in Figs. 2A and 2B. As described above, 12 bits of cyclic redundancy check (CRC) and 8 bits of encoder tail (additional bits) of the encoder are added to the converted 8Kbps or 13.35Kbps compressed voice signal to a 9.6Kbps or 14.4Kbps frame. Convert.

The voice signal having a 9.6 Kbps or 14.4 Kbps frame converted by the vocoder 2 is modulated by a modem, which is a baseband processing apparatus 3, is subjected to high frequency processing through an RF processing apparatus, and then transmitted through an antenna ANT. do.

When the transmitted voice signal is received by the base station 4 via the antenna ANT shown in FIG. 1B, the base station 4 demodulates the received voice signal and transmits it to the base station controller 5. The vocoder 6 provided in the base station controller 5 bypasses the transmitted 9.6 Kbps or 14.4 Kbps frame voice signal and transmits it to the other base station controller via the circuit switch 7.

The vocoder provided in the base station controller bypasses the 9.6 Kbps or 14.4 Kbps frame voice signal transmitted through the circuit switch 7 and is transmitted to the base station. The base station modulates the transmitted voice signal and then transmits the signal through an RF processor and an antenna.

The baseband / RF processing unit in the terminal performs demodulation after demodulating the modulated signal received by the antenna and provides a 9.6 Kbps or 14.4 Kbps frame voice signal to the vocoder. The vocoder converts the demodulated signal provided by the baseband / RF processing unit to a 64 Kbps PCM signal. The 64Kbps PCM signal is converted into an analog signal through the voice input and output unit and output.

However, such a conventional cellular system or PCS system has a problem in that it cannot support multimedia services because only voice data is communicated.

Accordingly, an object of the present invention is to provide a multimedia service support system for communicating with an IMT-2000 system terminal for supporting multimedia services by accessing a B-ISDN network, which is an ATM network, by a wired network to transmit a large amount of data at high speed. .

1A and 2B show a conventional cellular system or PCS system

2 is a frame structure diagram of voice data transmitted from FIG.

3A is a block diagram of a terminal in an IMT-2000 system according to the first embodiment of the present invention.

FIG. 3B is a block diagram of a multimedia service support system for communicating with the terminal of FIG. 3A in the IMT-2000 system according to the second embodiment of the present invention. FIG.

4 is a structure diagram of a data frame transmitted in FIGS. 3A and 3B.

(Explanation of symbols for the main parts of the drawing)

100: video input / output unit 101: video codec unit

102: voice input and output unit 103: vocoder

104: receiving path delay circuit 105: data input / output unit

106: data interface unit 107: mux / demux circuit

108: baseband / RF processing unit 109: base station

110: ATM matching circuit 111: ATM switch

112: mux / demux circuit 113: vocoder

114: format conversion circuit 115: E1 matching circuit

116 circuit switching circuit

The first means for achieving the object of the present invention is to convert the analog input video signal into a digital video signal by pulse-width modulation (PCM), and then add a frame quality indicator (CRC) after compressing according to the video compression algorithm Or image processing means for decompressing and compressing an input video compressed signal according to an image extension algorithm, correcting an error using the first frame quality indicator, and converting the video compressed signal into an analog signal; After converting the analog input audio signal into a digital audio signal by pulse width modulation, it is compressed according to the voice compression algorithm, and then a frame quality indicator is added or the decompressed and input voice compressed signal is extended according to the voice extension algorithm. Speech processing means for correcting the error using the second frame quality indicator and converting the error; Data processing means for receiving data, interfacing the data or demuxing the input data; After forming the bit stream by adding the video signal output from the video processing means to the audio signal output from the audio processing means, add a frame quality indicator and encoder tail bits, or add a third to the data output from the data processing means. A multiplexer for adding a frame quality indicator and encoder tail bits; A demultiplexer which demuxes a video signal, an audio signal, and general data which are demodulated and input to the image processing means, an audio processing means and a data processing means, respectively; The video signal, audio signal and general data outputted from the multiplexer are modulated and high frequency processed to be transmitted to the base station, or the video signal, audio signal and general data transmitted from the base station are subjected to high frequency processing and demodulated to the demultiplexer. It comprises a base band and RF processing means for providing.

A second means for achieving the object of the present invention comprises a base station for demodulating and modulating the transmitted video signal, audio signal and data; An ATM matching circuit for converting the demodulated video signal, audio signal and data frame into an ATM frame, or converting an input ATM frame into a video signal, audio signal and data frame and transmitting the same to the base station; An ATM switch for switching the ATM frame converted by the ATM matching circuit, a multiplexer / demultiplexer for demuxing the ATM frame switched in the ATM switch, or muxing an input video signal, an audio signal, and data, and the multiplexer / demultiplexer A vocoder for vocoding the demuxed voice signal at s, a voice signal output from the vocoder, and a video signal and data demuxed at the multiplexer / demultiplexer are converted into an ATM cell and provided to the ATM switch, or inputted at the ATM switch. And an ATM switch comprising a format converter for converting an ATM cell into a video signal, an audio signal, and a data format, and an E1 matching circuit for matching an ATM cell output from the ATM switch to a circuit switch.

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

Figure 3a shows a block diagram of an IMT-2000 system terminal according to a first embodiment of the present invention.

As shown in FIG. 3A, the IMT-2000 system terminal according to the first embodiment of the present invention converts an analog input video signal into 64Kbps video data by pulse width modulation (PCM), or a 64Kbps video input by vocoding. The video input / output unit 100 for converting the data into an analog signal and the 64 Kbps image data converted by the video input / output unit 100 are compressed according to an image compression algorithm, and then a 16-bit frame quality indicator (CRC2) is added or decoded. An image codec unit 101 which expands the mixed video input data according to an image extension algorithm, corrects an error using the frame quality indicator (CRC2), and converts the image compressed data into an analog signal;

A voice input / output unit 102 for converting an analog input voice signal into pulse width modulation to 64 Kbps digital voice data, or converting a voice vocoded 64 Kbps digital voice data into an analog voice signal, and the voice input / output unit 102 After compressing 64 Kbps digital voice data according to the voice compression algorithm, add a frame quality indicator (CRC1), or expand the decompressed and input voice compressed signal according to the voice extension algorithm, and then use the frame quality indicator (CRC1). After error correction, the vocoder 103 provided to the voice input / output unit 102, the reception path delay circuit 104 provided to the vocoder 103 by delaying the demuxed input voice data, and the data Data input / output unit 105 for inputting / outputting and data inputted through the data input / output unit 105 or demuxed for inputting data The data interface unit 106 for interfacing the data to the data input / output unit 105 and the video data output from the image processing unit 101 to the audio data output from the audio processing unit 103. After forming the, the 16-bit frame quality indicator (CRC3) and 8-bit encoder tail bits, or 16-bit frame quality indicator and 8-bit encoder tail bits to the data output from the data interface unit 106 A multiplexer / demultiplexer which adds the demodulated input image data, audio data, and general data to the image codec unit 101, the reception path delay circuit 104, and the data interface unit 106, respectively. 107 and image data, audio data, and general data outputted from the multiplexer / demultiplexer 107 are modulated and subjected to high frequency processing. Transferred to station, or consists of the image data, audio data and general data transmission from the base station to the high-frequency processing and demodulating the baseband and RF processing unit 108 to provide to the multiplexer / de-multiplexer.

3B is a block diagram of a multimedia service support system for communicating with an IMT-2000 system terminal according to a second embodiment of the present invention.

As shown in FIG. 3B, the multimedia service supporting system for communicating with the IMT-2000 system terminal according to the second embodiment of the present invention includes a base station 109 that demodulates and modulates transmitted video data, audio data, and general data. and; ATM which converts the demodulated image data, audio data and general data frame into ATM frame or converts the input ATM frame into image data, audio data and general data frame and transmits it to the base station 109 A matching circuit 110; ATM switch 111 for switching the ATM frame converted by the ATM matching circuit 110, demuxing the ATM frame switched by the ATM switch 111, or muxing the input image data, audio data and general data The multiplexer / demultiplexer 112, the vocoder 113 for vocoding the demuxed voice data from the multiplexer / demultiplexer 112, the voice data output from the vocoder 113 and the multiplexer / demultiplexer 112 Converts the demuxed image data and general data into ATM cells and provides them to the ATM switch 111, or converts the ATM cells input from the ATM switch 111 into image data, audio data, and general data formats. An ATM switch 113 composed of an section 114 and an E1 matching circuit 115 for matching the ATM cells output from the ATM switch 111 and connecting them to the circuit switch 116. It is composed.

The operation of the multimedia service support system for communicating with the IMT-2000 system terminal configured as described above will be described in detail with reference to FIG. 4 as follows.

IMT-2000 (International Mobile Telecommunications-2000) system is a third generation mobile communication system aimed at service in the early 2000s. It provides complete mobility to users by integrating wired and wireless communication environment and providing personal mobility with terminal mobility. It is an integrated network. In addition, the IMT-2000 system aims to provide international roaming so that users can make calls in any country, and interoperate terrestrial and satellite networks to cover a large area and effectively provide services to a sparsely populated area. Unlike conventional cellular systems or PCS systems that only support voice services, it is a multimedia mobile communication system that supports data, voice and video services up to 2Mbps.

Referring to the operation of the terminal to be used in the IMT-2000 system and the multimedia service support system to communicate with it as follows.

First, a process of transmitting a voice signal from a terminal to a telephone of a general home will be described.

When an image signal is input to the image input / output unit 100, the image input / output unit 100 digitizes the image signal into a 64Kbps PCM signal and provides the image codec unit 101. The image codec unit 101 compresses the 64 Kbps PCM signal provided by the image input / output unit 100 according to an image compression algorithm, and then adds a 16-bit frame quality indicator CRC2 shown in FIG. 4.

When a voice signal is input to the voice input / output unit 102, the voice input / output unit 102 digitizes the voice signal into a PCM signal of 64 Kbps and provides the vocoder 103. The vocoder 103 converts the provided 64Kbps PCM signal into 8Kbps (8K QCELP or EVRC) or 13.35Kbps (13KQCELP) compressed speech signal according to the vocoder algorithm, and then converts the compressed 8Kbps or 13.35Kbps compressed speech data. Each frame adds 12 bits of CRC1 and 8-bit encoder tail bits to convert to 9.6 Kbps or 14.4 Kbps frames. 4 illustrates only the 9.6 Kbps frame case.

The reason why CRC2 and CRC1 are added to the video data and the audio data, respectively, is that when the mux / demux circuit 112 provided in the ATM exchanger 113 to be described later is demuxed, the quality of the video and audio can be set separately. To do that.

When input to the data interface unit 106 via the data input / output device 105 which is an RS-232 port, an RS-422 port, an Ethernet port, or a USB port, the data interface unit 106 is, for example, an RS-232 port. Remove redundant data input from the data input / output device 105, add redundant data to output to the data input / output device 105, or mux / demux the data from which the redundant data is added / removed. Data sorting and buffering functions are provided to the circuit 107.

The audio data converted by the vocoder 103 and the video data output from the video codec unit 101 are muxed / demuxed by the mux / 107, and 16 CRC3 and 8-bit encoder tail bits are added thereto. The general data output from the data interface unit 106 is converted into a frame satisfying the North American TIA standard cdma2000 standard by adding 16 CRC3 and 8 bit encoder tail bits to the mux / demux unit 107.

The audio data, the image data, and the general data frame output from the mux / demux circuit 107 are modulated by a modem, which is a baseband / RF processing unit 108, are subjected to high frequency processing, and then transmitted to the base station 109.

When the transmitted voice signal is received by the base station 109, the base station 109 demodulates the received video data, voice data and general data and provides the same to the ATM matching circuit 110, and the ATM switch 110 The demodulated video data, audio data, and general data frames are converted into ATM frames and then provided to the ATM switch 111 at the ATM switch 200.

The ATM switch 111 transmits the ATM frame provided by the ATM matching circuit 110 to the mux / demux circuit 112. The mux / demux circuit 112 demuxes the ATM frame to directly transmit image data to the format conversion circuit 114, and to transmit audio data to the format conversion circuit 114 via the vocoder bank 113, respectively. do.

The format conversion circuit 114 formats the voice data transmitted from the vocoder bank 113 and the image data and the general data provided from the mux / demux circuit 112 in units of ATM cells to form the ATM switch 111. Will be sent to.

The audio data, the video data and the general data transmitted to the ATM switch 111 are sequentially passed through the E1 matching circuit 115 and the circuit switching circuit 116 to the other circuit switching switch 500 or the IWF (InterWorking Function) 400. It is transmitted to the Internet, PDN network and ATM networks of other countries.

On the other hand, the call process from the general phone to the terminal will be omitted because the opposite process of the above-described process, and the call process between the terminal and the terminal will be described as follows.

First, the operation of the terminal in the call process between the terminal described above and the general telephone is performed, and voice data, video data and general data are transmitted to the terminal via the base station 109, the ATM matching circuit 110, and the ATM switch 110. After being provided, a call procedure from the ordinary telephone to the terminal is performed. For voice data, the vocoder at the ATM switch 110 is bypassed.

As described above, the present invention has the effect of supporting data, voice and video services up to 2Mbps, unlike conventional cellular systems or PCS that support only voice services.

Claims (1)

A base station for demodulating and modulating the transmitted video signal, audio signal and data; An ATM matching circuit for converting the demodulated video signal, audio signal and data frame into an ATM frame, or converting an input ATM frame into a video signal, audio signal and data frame and transmitting the same to the base station; An ATM switch for switching the ATM frame converted by the ATM matching circuit, a multiplexer / demultiplexer for demuxing an ATM frame switched in the ATM switch, or muxing an input video signal, an audio signal, and data, and the multiplexer / demultiplexer A vocoder for vocoding the demuxed voice signal at s; And an ATM switch comprising a format converter for converting an ATM cell into a video signal, an audio signal, and a data format, and an E1 matching circuit for matching an ATM cell output from the ATM switch to a circuit switch. Multimedia for communication with an IMT-2000 system terminal Service support system.