KR19990038921A - A method of controlling fax signal of wireless data communication interlock device in digital mobile communication network - Google Patents

Abstract

The present invention relates to a G3 FAX incoming call control method of a wireless data communication interworking device in a digital mobile communication network. When transmitting data in a general mobile communication network, there is a problem that data is lost and a part of a fax image is damaged due to a deterioration of a wireless section or a handoff caused by a subscriber's movement. In order to solve this problem, the transport layer protocol is applied to recover the lost data, and the protocol header is compressed at the data link layer to reduce the overhead of the protocol header. The present invention provides a method for controlling a fax incoming call of a wireless data interworking device in a digital mobile communication network capable of performing a reliable fax transmission service by operating in a server manner.

Description

Method of controlling fax incoming call of wireless data communication interworking device in digital mobile communication network

The present invention relates to a method of controlling a fax incoming call of a wireless data communication interworking device in a digital mobile communication network.

In general, a wireless data communication network is divided into a wireless local area network and a mobile data network. Mobile data networks are also classified into wireless data networks using dedicated packet networks and cellular mobile telephone networks. Wireless data services that can be provided by such cellular mobile telephone networks include asynchronous data, facsimile services, short message services, and packet data services.

The wireless data service in the conventional cellular network includes data communication in Advanced Mobile Phone System (AMPS), packet data communication in cellular digital packet data (CDPD), and data communication in IS-54 digital cellular network. And data communication in a global system for mobile communication (GSM).

AMPS is an analog mobile telecommunications network and provides fax service using a wireless modem. In addition, GSM, a digital mobile communication network, provides a fax service using a wireless data communication interworking device. In a code division multiple access (CDMA) mobile communication network, only a voice service is provided and a data service, which is a non-voice service, is not yet available. Not provided.

The digital mobile communication network has been developed for voice service, but according to the development of information communication technology and user's demand, the demand for wireless data service that can exchange necessary information as well as existing voice is increasing. In the transmission of such wireless data, the transmitted data may be lost due to deterioration and handoff of the wireless section due to the characteristics of the mobile communication network. In addition, when a fax service is provided as one of non-voice services, a call is cut or a part of a fax image is damaged due to a loss of a fax command.

Accordingly, the present invention applies a transport layer protocol to recover lost data when providing a fax transmission service to a mobile subscriber in a digital mobile communication network, and by operating the transmission layer in a variable fax server mode when transmitting fax data, It is an object of the present invention to provide a method for controlling a fax incoming call of a wireless data communication interworking device in a digital mobile communication network capable of performing a reliable fax transmission service even when a degradation or handoff occurs.

In the digital mobile communication network according to the present invention for achieving the above object, the method for controlling a fax incoming call of a wireless data communication interworking device uses a call type to perform a resource state initialization and socket generation process by a data interworking device requesting call setting. And determining idle resources, initializing the selected resources, creating a socket which is an application program interface for data exchange between the mobile terminal and the wireless data communication interworking device, and determining the type of call to be serviced. Setting a shape of a link control protocol and a manganese protocol control protocol, performing a transmission control protocol connection setting process using the socket, entering a transmission control protocol setting state, and analyzing modem commands received from a mobile subscriber To fax mode Performing fax status management and sending / receiving fax commands for sending and receiving a fax command from a mobile subscriber to a modem and sending a response to the data terminal; and if the fax data transmission process is not performed within the time limit, A transmission control protocol for performing an operation process in a server mode, a call termination process when a fax reception of the mobile terminal is completed, and a protocol connection establishment termination and resource initialization process when the call is terminated; Disconnecting the point-to-point protocol, and releasing the call in use, initializing the allocated resources, and terminating the allocated resources.

1 is a structural diagram of a digital mobile communication system to which the present invention is applied.

2 is a structural diagram of a wireless data communication interworking apparatus to which the present invention is applied.

3 is a structural diagram of a transport protocol stack to which the present invention is applied;

4 (a) to 4 (d) are flowcharts illustrating a method of controlling a fax incoming call of a wireless data interworking apparatus according to the present invention.

<Description of the symbols for the main parts of the drawings>

11: data terminal 12: mobile terminal

13 base station 14 control station

15: mobile communication switch 16: subscriber location register

17: wireless data communication interlocking device 18: public telephone network

171: relay line matching and switching board 172: IWF management board

173: baud rate control and modem board

31: transmission control protocol 32: manganese protocol

33: subordinate dependent convergence function 34: link control protocol

35: manganese protocol control protocol

36: Point-to-Point Protocol 37: Wireless Link Protocol

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

1 is a structural diagram of a digital mobile communication system to which the present invention is applied.

An application program is mounted on the data terminal 11 which is a personal computer, and the mobile terminal 12 is a CDMA portable or vehicle subscriber terminal. The base station 13 is a subsystem for controlling radio matching in the CDMA system, and the control station 14 is a subsystem for controlling the routing of information, various call processing, and soft handoff between the base station 13 and the switching station 15. . The mobile switching center 15, which is an exchange, provides a switching function, and the subscriber location register 16 is responsible for the location management and operation of the subscriber. The wireless data communication interworking device 17 is a device for providing an asynchronous data service, and the mobile communication exchange 15 interworks with a public telephone network.

2 is a structural diagram of a wireless data communication interworking apparatus to which the present invention is applied.

The wireless data communication interworking device (17 in FIG. 1) provides asynchronous data service to mobile subscribers in a digital mobile communication network, and is a control function for relay line matching with the mobile communication switch (15 in FIG. 1), various resource management, and system control. And a speed matching function for data transmission and reception with the control station 14, a protocol processing function for reliable transmission, and a modem processing function for controlling the modem. Trunk Interface & Switching Assembly (hereinafter referred to as TISA) board 171 performs a trunk circuit matching function, a switching function, and a function of exchanging various signaling with the exchange. The IWF management board (hereinafter referred to as INWA) board 172 is responsible for controlling the interworking function (IWF) system and managing various resources. Rate Adaptation & Modem Assembly (hereinafter referred to as RAMA) The board 173 performs transmission rate adjustment and modem control functions, and a protocol of a transport layer is implemented. The control signals of each board are transmitted through the VME bus through the Dual Port RAM (DPRAM) and the data signals are transmitted through the Serial-Telecommunication (ST) -Bus. The data exchange with the control station (14 in FIG. 1) adds a predetermined preamble to the data to be transmitted and transmits it to the control station (14 in FIG. 1), and transmits the preamble from the data received from the control station (14 in FIG. 1). Use it to find the beginning of the data.

3 is a structural diagram of a transport protocol stack to which the present invention is applied.

Transmission Control Protocol (hereinafter referred to as TCP) 31, which is a transport layer, provides a function of guaranteeing whether packets are lost or reliable delivery of packets and ensuring order, and is a network layer called Internet Protocol (hereinafter referred to as IP). 32 is in charge of routing and status information management in the Internet. Sub-Network Dependent Convergence Function (SNDCF) 33 performs a compression function on the TCP / IP header to increase transmission efficiency. The data link layer comprises a Link Control Protocol (LCP) 34, an Internet Protocol Control Protocol (IPCP) 35, and a Point-to-Point Protocol (PPP) 36. It consists of. This data link layer is used for end-to-end data exchange over a single line and negotiates the initial setup and capacity of the link and TCP / IP header compression. Radio Link Protocol (RLP) 37 is a protocol that supports rejection and negative response for error control of data traffic.

4 (a) to 4 (d) are flowcharts illustrating a method of controlling a fax incoming call of a wireless data interworking apparatus according to the present invention.

A data terminal equipped with a fax program, a mobile terminal that is a CDMA subscriber station, a base station that is a sub-system for controlling CDMA wireless matching, and a subsystem for routing information routing and various call processing and soft handoff between the base station and the switching center. Fax in a CDMA digital mobile communication network consisting of a mobile control station, a mobile switching center providing a switching function, and a subscriber location register in charge of the subscriber's location management and operation, and a wireless data linkage device for providing asynchronous data and fax services. The incoming call control method is largely divided into resource state initialization and socket creation process 41, protocol connection setup process 42, fax state management and fax command transmission and reception process 43, fax server mode operation process 44, call Termination process 45 and protocol connection establishment termination and resource initialization process 46.

When the mobile subscriber selects the reception speed of the modem software of the data terminal and the rest of the options, and then waits, the mobile terminal temporarily stores the fax commands in the data terminal's application interface layer and responds to the fax commands. When the subscriber of the large station requests call setup to the mobile communication exchange to transmit a fax document, the mobile communication exchange receiving the incoming call request performs the incoming call processing in the same step as the voice service. During the incoming call processing, the service option of the page response signal received from the mobile terminal is analyzed and a fax service is requested (401) and a resource state initialization and socket creation process 41 is performed by the wireless data communication companion device. The wireless data interworking device, which has been requested to set up a call, determines whether a call is received by a mobile subscriber by using the number of trunks required for occupancy (402), selects idle resources (403), and starts a service control procedure. The interrupt of the selected pair of modems and the speed matcher is activated (404), the state of the modem is initialized, and various environmental variable values are initialized (405). When initialization is completed, a socket for exchanging information with the protocol stack module is created (406). Thereafter, the type of call to be serviced is determined (407). In case of an outgoing call, an outgoing call service process is performed, and in case of an incoming call, a protocol connection establishment process 42 is performed.

The protocol connection establishment process 42 is as follows.

After setting up a call between the wireless data communication companion device and the mobile terminal, the LCP configuration such as the maximum packet size, protocol field compression, and stuffing information is performed between the mobile subscriber's data terminal and the wireless data communication companion device (408). . After the LCP configuration is set, IPCP configuration, such as IP allocation and compression, is performed between the mobile terminal and the wireless data communication interworking apparatus 409. When negotiating the IPCP configuration, the IP address of the data terminal is assigned by the wireless data interworking device and negotiates the TCP / IP header compression option for effective data transmission in the low-speed radio section. After the negotiation is over, the wireless data communication interworking device transmits a TCP connection request using the allocated socket (410) and performs a TCP connection establishment process (411) with the data terminal of the mobile subscriber which was open manually (411). Enter setup state 412.

After entering the TCP configuration, the next step of the fax command transmission / reception process 43 is performed.

In operation 414, the wireless data communication interworking device transmits the fax commands temporarily stored in the data terminal of the mobile subscriber to the wireless data communication interworking device and receives them (413). When a fax command specifying whether the fax class is 2 is recognized, the process switches to the fax mode and switches the fax state to phase A (415). If a fax command specifying whether the received data is a fax class of 2 is not recognized, it is determined 416 whether a modem response command has been received from the mobile terminal. If the modem command is received as a result of the determination in step 416, the fax state is switched to phase B, and then the fax command is transmitted to the modem (418). If the modem response command is not received, the fax command is not switched. 418 is sent to the modem. Data is received 419 from the modem and a determination is made whether the fax status is phase B and whether the received data is a message carrier signal (420). If it is determined that the message carrier signal is received, the fax state is switched to phase C (421). Thereafter, the data received from the modem is transmitted (422) to the data terminal. Thereafter, it is determined whether the fax status is phase C (423), and if it is not phase C, the process proceeds to step 413 or step 419, and in case of phase C, an operation process 44 for the fax server mode is performed. do.

Operation 44 in the fax server mode is as follows.

If the fax state is phase C, the wireless data communication interworking device operates in the dynamic fax server mode according to the amount of data not transmitted to the mobile terminal after reception of one page. First, the wireless data communication companion device receiving the fax command 424 transmits the received fax command to the modem (425). Receiving data from the modem (426) determines whether the data is a multi-page signal or a procedure termination signal from the transmitting side (427). If a multi-page signal or procedure termination signal is received, remaining data in the wireless data communication interworking device is received. The size of the buffer is examined to determine whether the size of the buffer is 2000 bytes or more (428). As a result of the determination of the buffer size, if a buffer of 2000 bytes or more remains, the wireless data communication interlocking device operates in the fax server mode and transmits a message acknowledgment signal to the sender after 4 seconds (429). If it is determined whether the buffer size is a page signal or not, the buffer size of 2000 bytes or more is determined. In step 430, it is determined whether the type of the directly received signal is a procedure termination signal or a multi-page signal. When operating in the dynamic fax server mode, it is possible to increase the fax call success rate by reducing the call truncation rate that the call is abnormally terminated because the data transmission delay due to a temporary radio interval failure prevents a response within the timer end time of the protocol. As a result of determining the type of the received signal, when the procedure termination signal is received, the fax state is switched to phase D (431), and when the multi-page signal is received, the fax state is switched to phase B (432). Thereafter, the data received from the modem is transmitted 433 to the data terminal. Thereafter, the data received from the modem is transmitted 433 to the data terminal. Thereafter, it is determined whether the fax status is phase C (434), and in the case of phase C, the process proceeds to the step 424 of receiving a fax command to repeat the operation process 44 in the fax server mode. It is determined whether the fax state is phase B (435). As a result of the determination, in the case of phase B, the process proceeds to the step 413 of receiving a fax command from the data terminal in order to repeat the fax state management and the fax command transmission / reception process 43; Proceed.

The call termination process 45 is as follows. First, the wireless data communication companion device receiving the fax command 436 transmits the received fax command to the modem 437 and receives data 438 from the modem. Thereafter, it is determined whether an end signal has been received from the transmitting side (439). If an end signal is received, the result is transmitted to the data terminal, the fax state is switched to phase E (440), and the end of the call is requested. If is not received, the data received from the modem is transmitted to the data terminal (441). Thereafter, it is determined whether the fax state is phase E, and if it is not phase E, the process proceeds to step 439, in which it is determined whether an end signal has been received to repeat the call termination process 45. Proceeding to the termination and resource initialization process (46).

The protocol connection establishment termination and resource initialization process 46 is as follows.

When the call is terminated, the TCP of the data communication companion device requests to release the connection to the mobile terminal and releases the connection setting 443. After the TCP connection is released, the connection establishment of the PPP is terminated (444). After the PPP connection release process is completed, the mobile station exchange performs call release (445), initializes allocated resources (446), and then ends.

As described above, according to the present invention, a mobile subscriber can receive a fax from a subscriber of a fixed network or mobile network capable of receiving a fax by using a data terminal on which a fax program is mounted, and deterioration of a wireless section or of a mobile subscriber. In the event of a handoff due to movement, it is possible to provide a facsimile transmission service without loss of facsimile commands or data transmitted. In addition, there is an excellent effect of increasing the success rate of fax reception by operating the wireless data linkage device as a dynamic fax server when data transmission is delayed due to a temporary failure of the wireless section.

Claims (4)

In order to perform the resource state initialization and socket creation process, the data interworking device requested call setup determines the type of the call, selects idle resources, initializes the selected resources, and creates a socket, which is an application program interface for communicating with the data terminal. To do that, Determining the type of call to be serviced and, in the case of an incoming call, setting the shape of a link control protocol and a network protocol control protocol; Entering a transmission control protocol setting state after performing a transmission control protocol connection setting process using the socket; Performing fax status management and fax command transmission / reception processes to analyze the modem commands received from the mobile subscriber, switch to the fax mode, transmit the fax commands received from the mobile subscriber to the modem, and send a response to the data terminal; , Performing an operation process in a fax server mode when the fax data transmission / reception process is not performed within a time limit; Performing a call termination process when the fax reception of the mobile terminal is completed; Disconnecting a transmission control protocol and a point-to-point protocol to perform a protocol connection establishment termination and resource initialization process when the call is terminated; A method of controlling an incoming call of an apparatus for interworking with a wireless data communication in a digital mobile communication network, characterized by releasing a call in use, initializing an allocated resource, and terminating it. The method of claim 1, wherein the facsimile state management and the facsimile command transmission and reception process are performed. Receiving fax instructions that were temporarily stored at a mobile subscriber's data terminal; Analyzing the received fax command to determine whether a fax command specifying whether a fax class is 2 is recognized; Determining whether a modem response command has been received from the mobile terminal after switching to the fax mode and switching the fax status to phase A when the fax command specifying whether the fax class is 2 is recognized; Determining whether a modem response command is received from the mobile terminal when the fax command specifying whether the fax class is 2 is not recognized; If the modem response command is received, converting the fax state to phase B and transmitting the fax command to the modem; If the modem response command is not received, transmitting the fax command to the modem without switching the fax status; Receiving a response from the modem to the fax command; Determining whether the fax status is phase B and a message carrier signal has been received; If the message carrier signal is received as a result of determining whether the message carrier signal is received, switching the fax state to phase C, and transmitting data received from the modem to the data terminal; If the message carrier signal is not received as a result of determining whether the message carrier signal is received, transmitting data received from a modem to a data terminal; If it is determined that the fax status is phase C, and if the status is not phase C, the fax status management and fax command transmission / reception are repeated. If the fax status is phase C, the operation is performed in the fax server mode. An incoming call control method of a wireless data communication interworking device in a digital mobile communication network. The method of claim 1, wherein the operation in the fax server mode is Transmitting the received fax command to the modem by the wireless data communication companion device; Receiving data from the modem, Determining whether a multi-page signal or a procedure end signal has been received from the transmitting side; Determining whether the size of the buffer in the wireless data communication companion device is 2000 bytes or more when the multipage signal or the procedure termination signal is received as a result of determining whether the multipage signal or the procedure termination signal is received; When the buffer size is greater than 2000 bytes as a result of the determination of the buffer size, operating the wireless data communication interworking device in a fax server mode to transmit a message acknowledgment signal to the sender after a predetermined time; Determining whether the type of received data is a procedure termination signal or a multi-page signal; If the procedure termination signal is received as a result of determining the type of the received data, switching the fax state to phase D and transmitting the data received from the modem to the data terminal; If the multipage signal is received as a result of determining the type of the received data, switching the fax state to phase B and transmitting the data received from the modem to the data terminal; Transmitting data received from the modem to the data terminal when the procedure end signal or the multi-page signal is not received from determining whether the procedure end signal or the multi-page signal is received; Determining whether the fax status is phase C, and if the status is phase C, repeating the operation in the fax server mode, and determining whether the fax status is phase B if the fax status is not phase C; If the fax state is phase B, the process of the facsimile management and fax command transmission and reception proceeds, and if the fax state is phase D, a call termination process is performed. Method of controlling incoming call of interlocking device. The method of claim 1, wherein the call termination process comprises the steps of: transmitting a fax command received by the wireless data communication companion device to a modem; Receiving data from the modem, Determining whether an end signal has been received from the transmitting side; If the termination signal is received as a result of determining whether the termination signal is received, transmitting the result to the data terminal, switching the fax state to phase E, requesting termination of the call, and transmitting data received from the modem to the data terminal; Transmitting the data received from the modem to the data terminal when the termination signal is not received as a result of determining whether the termination signal is received; Determining whether the fax status is phase E, and if the fax status is not phase E, repeating the call termination process, and if the fax status is phase E, proceeding to the protocol connection establishment termination and resource initialization process. An incoming call control method of a wireless communication data interworking device in a digital mobile communication network.