KR0150284B1 - Wireless data communication interworking system in cdma network - Google Patents

Abstract

The present invention relates to a wireless data communication interworking device of a CDMA mobile communication system, and implements a protocol required for data services, and manages an entire system. An interworking management block for managing an entire system: a plurality of physical communication and switching functions with a trunk line. Relay line matching and switch block for outputting channels as a group: and removing the preamble added by the mobile communication control station to the data of the mobile station terminal received from the relay line matching and switch block and extracting the pure data to perform the interworking. Transmit to the device management block and add the preamble to the pure data of the terminal of the public telephone network received from the interlocking device management block, insert it into the designated channel, and convert it into the analog modem signal to communicate with the analog data terminal. Speed conversion and modem matching It is configured to be characterized.

Description

Wireless Data Communication Interworking System in CDMA Network

1 is a structural diagram of a CDMA mobile communication network to which the present invention is applied.

2 is a diagram illustrating a connection method between a mobile communication switch and a wireless data communication interworking device.

3 is a structural diagram of a wireless data communication interworking apparatus according to the present invention.

4 is a detailed block diagram of a wireless data communication interworking apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

301: interlock device management and control block 302: speed conversion and modem matching block

303: relay line matching and switch block

The present invention relates to a wireless data communication interworking device of a CDMA mobile communication system, and more particularly, to a CDMA mobile station subscriber having a data terminal in a CDMA digital mobile communication system and a PC and a G3 Fax terminal accommodated in a conventional public telephone network (PSTN). The present invention relates to a wireless data communication interworking apparatus required for providing a service capable of providing end-to-end communication with or retrieving information stored in a database in a data network. With the development of mobile communication technology, the demands of users are increasing widely, and the demand for wireless communication of data as well as voice is increasing. In order to provide such a service in a digital mobile communication network, a separate device is required for data communication between a mobile subscriber and a fax or a personal computer connected to an existing public communication network. A wireless data communication interworking device is a device for performing such a function, and is connected to a CDMA mobile communication switch with an E1 digital relay line, and converts or inverts data packets into modem signals, analyzes signals between stations, and allocates or releases the modem. Perform conversion to analog modem signal or vice versa.

Accordingly, the present invention provides end-to-end communication between a CDMA mobile station subscriber having a data terminal and a PC and G3 Fax terminal housed in a conventional public telephone network (PSTN) in a CDMA digital mobile communication system, or a database in a data network. An object of the present invention is to provide a wireless data communication interworking device capable of providing a service for retrieving information contained in the information. In order to achieve the above object, the present invention implements a protocol required for data services, and manages an interworking device management block for managing the entire system: a plurality of channels are connected by a physical matching and switching function with a trunk line. Relay line matching and switch blocks to be output as a group of: and the relay line matching and switch blocks are connected by a serial telecom (ST) bus, and the interlock management block is connected through DPRAM (Dual Port RAM). Removes the preamble added by the mobile communication terminal from the relay terminal matching and switch block, extracts the pure data, transmits it to the interlocking management block, and receives the public telephone network received from the interlocking management block. Add preamble to pure data of terminal and insert into pre-determined channel To communicate with the terminal is characterized in that log data is configured by the speed change and modem matching block which performs the conversion function to the analogue modem signal.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention. 1 is a diagram showing a communication network structure of a CDMA system to which the present invention is applied. In FIG. 1, the data terminal 101 is a hightel terminal or a personal computer having an asynchronous communication function or a personal computer having a FAX function, which has a data protocol function and a terminal connection intelligence (ELA 232-E) function. The CDMA mobile communication terminal 102 is connected to the data terminal in the ELA-232E method, encoded in the CDMA method, and wirelessly connected to the mobile communication base station 103 through the wireless matching device. The base station 103 performs CDMA channel coding and decoding functions and is connected to the control station 104 via the E1 transmission path. The control station 104 performs path allocation of data transmitted from the base station and performs a selection function for soft handoff to ensure continuity of communication according to the movement of the accessing mobile station. The mobile communication exchange 105 is coupled with the wireless data communication interworking device 106 and is connected to the mobile network and the existing public communication network 107 to include all signal processing and visitor location registers relating to the mobile station's incoming and outgoing signals. The public communication network 107 performs a transmission and relay exchange function according to the network configuration to connect with the public communication terminal to enable communication between the data terminal connected to the mobile communication terminal and the terminal connected to the public communication network. 2 is a diagram illustrating a connection method between a CDMA mobile communication switch and a wireless data communication interworking device. Data through the data terminal of the mobile subscriber is input to the mobile communication switch through the base station and the control station as described in FIG. 1, and allocates a path connected to the interworking device when the type of call set up under the control of the mobile switch is data communication. The wireless data communication interworking device (IWFS) is connected to the switch with a 2.048 Mbps E1 matching method. The IWFS connection and disconnection function and the data packet are converted and converted into modem signals through the line signal currently used for relay between stations. In addition, it analyzes signals between stations and performs the corresponding modem assignment and release functions and self maintenance functions. Thus, as shown in FIG. 2, all control stations and public telecommunication networks are connected to the mobile switchboard, and in the case of data communication, the mobile switcher functions in conjunction with IWFS to connect the processed data back to the network. 3 is a structural diagram of a wireless data communication interworking apparatus according to the present invention. The wireless data communication interworking device is largely divided into a block in charge of protocol processing, maintenance, and management: a block consisting of a part, a modem, and a codec that function to pack or unpack packets by adding or deleting preambles to pure data: It is composed of blocks that perform E1 matching and switching functions with the mobile exchange. The wireless data communication interworking device physically consists of a digital relay line matching and switch block 303, a channel speed conversion and modem matching block 302, and an interworking device management block 301. The interworking device management block 301 plays a central role in the wireless data communication interworking device, and is implemented in the device when various protocols are required for the data service. The interlock management block 301 manages the relay line matching and switch block 303, the speed conversion and modem matching block 302, and the data of the asynchronous terminal or the data through the speed conversion and modem matching block and DPRAM (Dual Port RAM) communication. Faxes (FAX) data, etc. are delivered in a fixed format. In the relay line matching and switch block 30, eight 64 Kbps channels are provided as a group by a speed matching and modem matching device by physical matching and switching with the relay line. The speed conversion and modem matching block 302 is a serial telecom (ST) bus to the relay line matching and switch block, and is connected to the interlocking management block through DPRAM and receives data of the mobile station terminal received from the relay line matching and switch block. Removes the preamble added by the mobile communication control station, extracts the pure data, transmits it to the management block, adds the preamble to the pure data of the terminal of the public telephone network received from the management block, and inserts the preamble into the predetermined channel. Converts into analog modem signal for communication with data terminals. That is, the management device receiving the call initiation signal from the relay line matching and switching device allocates the corresponding modem and waits for data reception from the speed conversion and modem matching device. When a call is established between the mobile station terminal and the data terminal of the public telephone network, the data of the mobile station terminal is received by the speed matching and modem matching device through the relay line matching and male position device, and the speed conversion and modem matching block is removed from the preamble and the management block. send. The management block performs the protocol processing accordingly, and then transfers it back to the speed conversion and modem matching block and transmits it to the modem terminal of the public telephone network through the modem in the device. The reverse data flow adds a preamble to the data received from the rate conversion and modem matching block and transmits it to the relay line matching and switching device through the designated channel of 64 Kbps and sends it to the mobile station data terminal through the mobile switching center and the control station. 4 is a detailed block diagram of the present invention. In FIG. 4, the relay line signal input to the E1 transmission path 401 is input by performing an equalization function according to the distance from the E1 equalizer 402 to the repeater O / R and the frame in the E1 matching circuit 403. The synchronization signal is extracted and input to the digital phase lock circuit 404. The circuit generates 8KHz frame synchronization signals, 4.096 MHz and 2.048 MHz clocks synchronized with the clock of the mobile exchanger to generate the time switch 405 and the codec 406, The speed conversion circuit 409 and the E1 matching circuit are inputted, and in the E1 matching circuit, they are converted into the ST-Bus form in accordance with this clock and input to the time switch 405. The time switch 405 has a register therein and performs a time switching function for each channel under the control of the control processor 411, and the data communication call generated from the mobile communication network is transmitted from the mobile communication control station to the speed conversion circuit 409. After removing the added preamble for data communication identification, extracting the pure data, sending it to the memory 412, and performing appropriate processing by the program thereafter, the modem 408 and the hybrid circuit for two-wire and four-wire conversion 407 Is input to the codec 406 via the " The codec 406 converts an analog signal into a digital 64 Kbps signal and transmits it to the time switch 405 by converting it into a law A PCM signal recommended by 1TU-T because the connection to the exchanger uses an E1 relay line. The time switch 405 is controlled by the control processor and sends a signal input from the COMMEX to the ST-Bus output to the E1 matching circuit 403, and is then input to the mobile switch through the E1 equalizer to connect the relay line connected to the public communication network. The data is transmitted through the terminal of the public telecommunication network. Data communication from the public telecommunication network or through the public telecommunication network is input through the relay line to the CDMA mobile switchboard, and the mobile switch exchanges the IWFS to send this data to the IWFS when the corresponding number is recognized as the mobile subscriber data terminal through confirmation of the home location register. Allocate the channel of the connected E1 relay line. The data input through the transmission path 401 is input to the time switch 405 via the E1 matching circuit 403, and this signal is converted into an analog signal by the codec 406 to the hybrid circuit 407 and the modem 408. The preamble is added to the time switch 405 by the FIFO register 408 and the speed conversion circuit 409 through the memory 414, and the E1 relay line allocated for matching with the mobile communication network is It is input to the mobile switch through the control station and the base station to be input to the mobile subscriber's data terminal. The control processor 411 is a processor that controls and manages the apparatus of the present invention, and the EEPROM 413 is for storing a program for initialization and control of the apparatus, and the VME control circuit 414 stores all the processors and memory elements in the apparatus. The VME control circuit for using the VME-Bus to connect and the ELA-422 matching circuit 415 is for connecting the monitor for operator testing and maintenance. By applying such a wireless data interworking device to a mobile communication network, it is possible to use the data communication equipment used in the public communication network and the data communication using the wireless terminal in the CDMA mobile communication network, and in case of the authentication code from the public communication network, There is no need to distinguish between voice calls and data services, and it is not affected by the network configuration.

Claims (1)

Interworking device management block that implements the protocol required for data service and manages the whole system: Relay line matching and switch block for outputting multiple channels in one group by physical matching and switching function with trunk line: The relay line matching and switch block is connected to a serial telecom (ST) bus, and the interworking device management block is connected through DPRAM (Dual Port RAM), and the data of the mobile station terminal received from the relay line matching and switch block are provided. Removes the preamble added by the mobile communication control station, extracts pure data, transmits it to the interlocking management block, and adds the preamble to the pure data of the terminal of the public telephone network received from the interlocking management block. Inserts into an analog modem and communicates with the analog data terminal A wireless data communication interworking device, comprising: a speed conversion and modem matching block for performing a signal conversion function.