KR100243087B1 - Method of facsimile service on cdma network - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fax service in a CDMA mobile communication network, wherein a CDMA mobile terminal in which voice is currently being serviced for communicating with a public telephone network or a fax device of a subscriber of the same CDMA mobile network by using a CDMA mobile terminal using a fax software used in a wireline In this paper, a facsimile service method is proposed in a CDMA mobile communication network in which a protocol for enhancing service reliability is located and a user can guarantee the same quality of service as a wired line even when using an existing fax environment.

Description

Facsimile service method in code division multiple access mobile communication network {Method of facsimile service on CDMA network}

The present invention relates to a group-3 standard facsimile (hereinafter referred to as fax) service method in a code division multiple access (CDMA) mobile communication network, and more particularly to a CDMA mobile terminal for reliable fax service. The present invention relates to a method of facsimile service in a CDMA mobile communication network in which a protocol stack and a computer running general fax software are connected to a mobile terminal to maintain the same user interface and quality as in a wired system.

Currently, CDMA mobile communication networks are serviced mainly for voice. That is, the subscriber presses the keypad of the mobile terminal handset, enters the telephone number of the called user, and receives a voice call with the other subscriber through the handset handset. However, the end-to-end mobile communication subscriber to fax service is not yet developed.

1 is a configuration diagram of a facsimile for a general Group 3 fax service, which will be described below. The analog data read by the CCD scanner 11 is converted into a digital signal by an analog / digital converter (A / D converter) 12. The converted digital signal is compressed in MH / MR / MMR format, which is an algorithm for a fax image (13), and the compressed signal is input to the transmission modem 14. The transmission modem 14 converts the digital signal into an analog signal of the public telephone network 15 and sends it to the network. After receiving the analog signal received from the public telephone network 15, the receiving modem 16 converts it into digital image data and expands it to MH / MR / MMR format (17), and then the fax device 18 or the fax application software of the computer. Will be sent to. In this way, a fax service through a public telephone network can be made by a fax modem (a transmission modem and a reception modem) equipped with a fax device or a computer running fax application software on the sending and receiving sides.

On the other hand, in the CDMA mobile communication network, all data up to the end of the network can be transmitted digitally. Therefore, data conversion is required only when transmitting from the mobile communication network to a public telephone network or other heterogeneous network. Therefore, in a CDMA mobile communication network, an interworking function (hereinafter referred to as IWF) for data conversion is provided to a fixed station such as a base station device or a mobile switch. The IWF has a fax modem pool, protocol conversion between CDMA and heterogeneous networks, and speed matching with subsystems within the network.

Accordingly, an object of the present invention is to provide a facsimile service method in a CDMA mobile communication network capable of providing the same quality of service as in a wired network.

According to an aspect of the present invention, there is provided a method of transmitting a response message to a data terminal after receiving and storing a modem initialization command transmitted from a fax software of a data terminal in an application interface of a mobile terminal. Transmitting a modem dial command from the data terminal receiving the message to the application interface of the mobile terminal; initiating a call for a base station and a fax service from the application interface of the mobile terminal receiving the modem dial command from the data terminal; After the base station allocates a call channel to the call initiated by the mobile terminal, generating a service option response message and transmitting the generated service option response message to the mobile terminal; Initializing a serial link by simultaneously initializing a link protocol, driving a link control protocol after a point-to-point protocol of a mobile terminal and a base station is initialized after the radio link protocol is initialized, and the serial link; Negotiating the header compression of the address and transmission control protocol / network protocol between the mobile terminal and the base station using the network protocol between the mobile terminal and the base station after the initialization; and the transmission control protocol / network protocol of the mobile terminal and the base station through the negotiation After the initialization is assigned an address of the manganese protocol, and after the address of the manganese protocol is assigned to the transmission control protocol / network protocol, transmitting a modem initialization command and a dial command stored in the application interface of the mobile terminal to the base station; Modem initialization command After performing the steps and, the fax transmission and reception procedure for performing fax transmission and reception process between the data terminal and the base station from one base station receives the dial command is characterized in that the protocols are made of a phase which is turned off with the process of setting and vice versa.

1 is a block diagram of a fax apparatus for a general group-3 fax service.

2 is a block diagram of a standard protocol stack in a CDMA mobile communication network.

3 is a flowchart illustrating an example of a fax transmission and reception procedure in a general public telephone network.

4 is a block diagram of a protocol stack for facsimile service in a CDMA mobile communication network according to the present invention;

5 is a block diagram of a fax service system according to an embodiment of the present invention.

6 (a) and 6 (b) are flowcharts of a facsimile service method in a CDMA mobile communication network according to an embodiment of the present invention.

<Description of Signs of Major Parts of Drawings>

201: Asynchronous Data 202: FAX Software

203: application interface (AI) 204: transmission control protocol (TCP)

205: Manganese Control Message Protocol (ICMP)

206: manganese protocol (IP)

207 subnetwork dependent convergence function (SNDCF)

208: manganese control protocol (IPCP) 209: link control protocol (LCP)

210: point-to-point protocol (PPP) 211: radio link protocol (RLP)

212: TIA / EIA / IS-95 call channel

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

2 is a configuration diagram of a protocol stack proposed as a standard for data reliability in a CDMA mobile communication network. This protocol stack standard is proposed for reliable data transmission between user's data terminal and IWF in unreliable wireless environment due to noise, fading and handover. The protocol stacks are as follows. Asynchronous Data 201 and FAX 202 represent application software for data services. The application interface (hereinafter referred to as AI) 203 has functions such as a standard or extended AT (control character that recognizes that the modem is a fax transmission and reception) command processing unit and data compression negotiation. This protocol stack is a transmission control protocol (hereinafter referred to as TCP) 204 / network protocol (Internet Protocol: referred to as IP) 206, which is widely used in the Internet, and the like. It is used as a protocol. In addition, a manganese control protocol (hereinafter referred to as IPCP) 208, a link control protocol (hereinafter referred to as LCP) 209, point-to-point, for transmitting these packets over a serial link. Sub-Network Dependent Convergence Function (SNDCF) protocol for point to point protocol (PPP) 210 and TCP 204 / IP 206 header compression. 207) and the like. On the air interface between the mobile station and the base station in the CDMA mobile communication network, there is more noise and fading than the conventional wired channel, and the data service has a bit error rate (BER) on a wireless communication channel which is lower than the voice service. ). The radio link protocol (hereinafter referred to as RLP) 211 is a link layer protocol that compensates for the constraints on the wireless communication channel of such data service and is responsible for synchronization, data retransmission, and flow control between the two stations. The RLP layer divides the variable-length data packet of the upper layer into TIA / EIA / IS-95 call channel frames according to the multiplexing sublayer according to the TIA / EIA / IS-95 call channel 212. Since it is not concerned about the upper layer, frames in the upper layer are regarded as a series of octets not related to a specific service and are transmitted in the order received from the upper layer.

3 is a flowchart illustrating an example of a fax transmission and reception procedure in a general public telephone network.

Apart from the standard protocol stack, the Group 3 fax service on the public telephone network will have the general procedure as shown in accordance with the T.30 protocol. 3 is shown as an example, with some differences as not all fax machines are fully compliant with T.30. Data terminals (hereinafter referred to as DTEs) and fax modems (hereinafter referred to as DCEs) at the transmitting and receiving sides as shown use Group-3 facsimile Class 2 modem commands. Modem commands that control fax modems vary among fax modem manufacturers, but their operation is in accordance with CCITT Recommendation T.30 procedures and signals.

This CCITT Recommendation T.30 procedure is described as five separate consecutive phases:

Phase A: Call Settings

Phase B: Full message procedure for identification and selection of required equipment

Phase C: Send Message

Phase D: Post-message and multi-document procedures, including termination and confirmation of the message

Phase E: Arc Recovery

Each of these phases represents the establishment and retrieval of connections according to normal rules for use in general switched telephone networks, the identification, monitoring and control of facsimile transmissions according to protocols, and the identification, monitoring and control of facsimile message transmissions.

The operation in phase A is as follows. When the transmitting side DCE receives the service class setting modem command (AT + FCLASS) transmitted from the transmitting DTE to initiate the call, the transmitting side transmits an acknowledgment signal to the transmitting DTE. A transmitting acknowledgment signal is sent to the transmitting DTE by the transmitting DCE that receives the modem command (+ FLID) indicating its ID transmitted from the transmitting DTE. When the transmitting DTE transmits a dial string code to the transmitting DCE, the receiving DCE generates a dialing and a CNG tone and transmits the dialing tone to the receiving DCE. Before receiving the dial tone, the receiving side also performs an operation for initiating a call. First, when the receiver transmits a reception capability signal (AT + FCR) to the receiving DCE with a control character recognizing that the modem transmitted from the receiving DTE is a fax transmission / reception, the receiving DCE transmits an acknowledgment signal to the receiving DTE. . When the receiving DTE transmits a modem command (AT + FLID) indicating its ID to the receiving DCE, the receiving DCE transmits an acknowledgment signal to the receiving DTE. When the receiving side DCE receives the CNG tone from the transmitting side DCE, the receiving side DTE notifies the receiving side DTE, and the receiving side DTE transmits a modem response command (ATA) to the receiving side DCE, and then proceeds to phase B.

The operation of phase B is as follows. Upon receiving the modem command response word (ATA) at the receiving side DCE, the called party identification number (CED) and phase B preamble (V.21 ch.2 modulated by 300 bits / s HDLC flags) are transmitted to the transmitting side DCE. As soon as the sending DCE detects this, it sends an acknowledgment (+ FCON) signal for the fax connection informing the sending DTE of the connection. In addition, when the receiving side DCE transmits the called party identification number (CSI) and the receiving command tone (DCS) to the transmitting side DCE, the current session parameter (+ FDIS) and the function identification tone code from the receiving side DCE to the transmitting side DTE are received. (DIS code) is transmitted to the transmitting DTE, and the phase B preamble (V.21 flags) is transmitted to the receiving DCE. Receiving the Phase B preamble, the receiving DCE sends an acknowledgment signal (+ FCON) signal for the fax connection to the receiving DTE. In addition, the sending DCE negotiates both functional identification and reception conditions such as vertical resolution and bit rate, and receives the received functional identification tone (DIS) frame and the previously set current session parameter (+ FDIS). A receive command tone (DCS) frame is generated with the transmit subscriber identification number (TSI) and transmitted to the receiving side DCE. Receiving a data transmission acknowledgment (AT + FDT) message from the transmitting DTE, the transmitting DCE stops transmitting the received command tone (DCS) frame to the receiving side and proceeds to phase C.

The operation in phase C is as follows. Sending side ID report (+ FTSI) signal and current session result (+ FDCS) signal from receiving side DCE receiving receiving command tone (DCS) and transmitting subscriber identification number (TSI) from transmitting side DCE to receiving side DTE . The receiving side DTE transmits a phase C reception start and continue (AT + FDR) signal to the receiving side DCE. The receiving DCE sends an acknowledgment (+ FCRF) signal to the receiving DTE and a receiving acknowledgment (CFR) signal to the transmitting DCE. Upon receiving the acknowledgment signal, the transmitting side DCE transmits a current session result (+ FDCS) signal to the transmitting side DTE and a carrier to the receiving side DCE. After connecting to the transmitting DTE, the control character (XON) for flow control is transmitted. In addition, when the carrier is connected from the receiving DCE to the receiving DTE, a control character (DC2) indicating that the buffer is empty is transmitted from the receiving DTE to the receiving DCE. In this way, transmission of the actual data, the transmission of the actual data, the character 0x10 (DLE) indicating the start of the control character and the character ETX indicating the end of the stream are performed from the transmitting side to the receiving side. When a single document is sent, phase C ends and the sending DTE announces the start of phase D for multipage document or post T.30 message procedure via a previous page result response (+ FET) message.

In phase D, if the previous page result reply (+ FET) message is zero, then back to phase B to negotiate the next page document, and if the previous page result reply (+ FET) instruction is 2, the document transfer for the entire page is complete. Go to phase E and the call is released with the call transfer code (+ FHNG) according to the state. However, in the example shown, it returns to phase B because the previous page result response (+ FET) instruction is zero. The RTC signal, the drop carrier, and the multi-page signal (MPS) transmitted by the transmitting DCE are received by the receiving DCE, and the receiving DTE indicates the character (DLE) indicating the start of the control character and the end of the stream, respectively. The control character (ETX), the page transfer status (+ FPTS) signal, and the previous page result response (+ FET) signal are transmitted. Previous page Result Sends a phase C receive start and continue (+ FDR) signal from the receiving DTE to the receiving DCE from the receiving DTE that received the response (+ FET) signal and a message acknowledgment signal (MCF) from the receiving DCE to the sending DCE receiving it ). When the transmitting DCE receiving the message acknowledgment signal (MCF) transmits a page transfer status (+ FPTS) signal to the transmitting DTE, the transmitting DTE receives the data transmission acknowledgment (AT + FDT) signal to the transmitting DCE. Send to DCE again. The transmitting DCE sends a carrier to the receiving DCE and transmits a connection setup signal and a control character (XON) signal for flow control to the transmitting DTE. When the receiving side DCE receives the carrier and transmits a connection setup signal to the receiving side DTE, the receiving DTE transmits a control character DC2 indicating that the buffer is empty to the receiving side DCE. In this way, transmission of the actual data and the actual data and the transmission of the character (0x10) (DLE) indicating the start of the control character and the character (ETX) indicating the end of the stream are performed from the transmitting side to the receiving side. When a single document is sent, phase C ends and the sending DTE announces the start of phase D for multipage document or post T.30 message procedure via a previous page result response (+ FET) message. In phase D, if the previous page result response (+ FET) message is 2, the transfer of the document for the entire page is complete and the process proceeds to phase E.

The operation of the phase E state is as follows. When the sending DCE receives the previous page result response (+ FET) message 2 and sends the RCT, drop carrier, and end of document (EOP) signals to the receiving DCE, the receiving DCE Transmits a character (DLE) indicating the start of the control character, a control character (ETX) indicating the end of the stream, a page transfer status (+ FPTS) signal, and a previous page result response (+ FET) signal to the receiving DTE, respectively. . The receiving DTE sends a phase C data start and continue (AT + FDR) signal to the receiving DCE when it receives the previous page result response (+ FET) signal and acknowledges the message from the receiving DCE to the sending DCE ( MCF) signal. The DCE receiving the message acknowledgment (MCF) signal sends the page transfer status (+ FPTS) signal and the call transfer (+ FHNG) signal according to the status to the transmitting DTE, and then receives the circuit disconnection (DCN) signal. To send. The receiving DCE receives the circuit disconnect (DCN) signal and sends a circuit disconnect (+ FHNG) signal to the receiving DTE to release the call.

For the fax service in the CDMA mobile communication network, the general call processing procedure between the terminal and the base station and the facsimile transmission procedure in the public telephone network illustrated in FIG.

In the present invention, a protocol stack is placed as shown in FIG. 4 to support a group 3 fax service, which is already reserved for service option 5, in a CDMA mobile communication network, and a configuration and procedure of a mobile station will be described in connection with operation of each protocol.

4 is a block diagram of a mobile station protocol stack according to the present invention. Run fax application software 41 on a data terminal, such as a notebook computer, mount the sub-AI protocols on the CDMA mobile terminal (42), and then distribute or integrate the protocols at various locations in the base station to pair them. Configure (43). This shape is basically burdened by mounting all protocol stacks in the mobile terminal, but from the user's point of view, the user's convenience and purchase of software can be diversified by using the familiar fax software.

5 is a configuration diagram of a fax service system according to an embodiment of the present invention, which is an example of a configuration of a CDMA fax service system configured according to the location of the protocol stack specified in FIG. As shown, a subscriber having a notebook computer 51 and a CDMA handset 53 and a cable 52 connecting the notebook computer and the handset is connected to a public telephone network using a base station 54 of a CDMA mobile communication network 55. ) Is shown.

6 (a) and 6 (b) are flowcharts for explaining a fax service method in a CDMA mobile communication network according to an embodiment of the present invention. The procedure when sending a fax image is shown as an example. The fax software of the data terminal enters a modem initialization command and sends it to the mobile terminal (601). The AI of the mobile terminal receives and stores it and sends an appropriate response to the command to the data terminal. Upon receiving the modem dial command from the data terminal (602), the AI of the mobile terminal initiates a call to the fax service option number 5 using the same call processing procedure as the existing voice call processing procedure (603). The base station allocates a call channel to the call initiated by the mobile terminal and generates and transmits a service option response message to the mobile terminal (604). When the mobile terminal receives the service option response message, the RLPs of the mobile terminal and the base station are simultaneously initialized (605). This is possible because each protocol stack of the mobile terminal and the base station exists in pairs. When the RLP is initialized, the PPP of the mobile terminal and the base station is initialized (606) and then the LCP is driven to initialize the serial link (607). The mobile station and the base station negotiate IP address and TCP / IP header compression using IPCP (608). Subsequently, TCP / IP of the mobile terminal and the base station are simultaneously initialized and an IP address is assigned (609). When the IP address is assigned to TCP / IP, the AI of the mobile terminal transmits the previously stored modem initialization command (* 1) and dial command (* 2) to the base station for modem control of the IWF (610). When the data terminal receives an acknowledgment (+ FCON) message for the fax connection informing the connection to the other fax device from the base station's IWF (611), the data terminal transmits the T.30 procedure between the fax application software and the other fax device. Proceed with the negotiation of phase B in accordance with When the data terminal receiving the acknowledgment (+ FCON) message for the fax connection proceeds to negotiate phase B, the base station transmits the current session parameter (+ FDIS) to the data terminal (612) and transmits an acknowledgment signal (613). . The data terminal receiving the current session parameter (+ FDIS) transmits a data transmission acknowledgment (AT + FDT) message to the base station (614). After receiving the data transmission acknowledgment message, the base station transmits the current session result (+ FDCS) message together with the received command tone code (DCS code) to the data terminal (615) and connects the modem module 9600 (616). In this way, the data terminal transmits one document, a character DLE indicating the start of the control character, and a control character ETX indicating the end of the stream (617). When the base station that has received one document transmits an acknowledgment signal to the data terminal (618), if there is a next document to be transmitted from the received data terminal, the previous page result response (AT + FET) signal 0 is transmitted to the base station (619). ). After receiving the previous page result response signal and recognizing that there is a document to be received next, the base station transmits a page transmission status (+ FPTS) signal to the data terminal (620) and then transmits an acknowledgment signal to the data terminal (621). After transmitting the data transmission acknowledgment (AT + FDT) signal from the data terminal receiving the page transmission status signal and the acknowledgment signal to the base station (622), the second document is transmitted. When there is no more document to be transmitted in the data terminal transmitting the second document, the previous page result response (AT + FET) signal 2 is transmitted to the base station (623). After receiving the previous page result response signal 2 and recognizing that there are no more documents to receive, the base station transmits a page transmission status (+ FPTS) signal to the data terminal (624) and then sends a call transfer (+ FHNG) message according to the status. A call is disconnected by the data terminal (625) and a confirmation signal is transmitted (626). After the call is disconnected, the protocols of the IWFs of the mobile terminal and the base station are released in a procedure opposite to the setting (627).

As described above, according to the present invention, it is possible to transmit and receive the same document facsimile in a CDMA mobile communication network.

Claims (1)

Transmitting and receiving a response message to the data terminal after receiving and storing the modem initialization command transmitted from the fax software of the data terminal in the application interface of the mobile terminal, and receiving the response message from the mobile terminal. Sending a modem dial command to an application interface, initiating a call for a base station and a fax service at an application interface of the mobile terminal receiving the modem dial command from the data terminal, and for a call initiated by the mobile terminal; Allocating a call channel and generating a service option response message to the mobile terminal, and receiving a service option response message from the mobile terminal to initialize the wireless link protocol of the mobile terminal and the base station at the same time And initializing a serial link by driving a link control protocol after initializing the point-to-point protocols of the mobile terminal and the base station, and initializing the serial link. Negotiating an address of the network protocol and header compression of the transmission control protocol / network protocol using the network protocol; initializing the transmission control protocol / network protocol of the mobile station and the base station through the negotiation; And assigning an address of a manganese protocol to the transmission control protocol / manganese protocol and transmitting a modem initialization command and a dial command stored in an application interface of the mobile terminal to a base station, and at the base station receiving the modem initialization command and the dial command. Fax between data terminals and base stations After the step of performing a reception process, perform the facsimile transmission procedure, a code division multiple access method facsimile service in a mobile communication network, characterized in that made in the protocols comprising the step of setting to be off by a procedure opposite.

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