KR100504843B1 - A method and a apparatus of fax data with variable flag length for gsm system - Google Patents

Abstract

According to the present invention, a variable length of a flag of frameless data transmitted by a transmitting side and a receiving side of a GS mobile communication system is appropriately adapted to a wireless environment, and is transmitted from a counterpart connected to a GSM system. A first step of determining whether a format signal is input; A second step of determining whether all of the flag signals are detected when the BSI format signal is input in the process; A third step of judging whether an error is detected by the fps region when the flag signal is detected in the step; In the above process, if the error is not detected in the BS region, the fourth process performs a corresponding process according to the input BESS format. Thus, the BS frame signal without error can be obtained even in a poor wireless environment of the GSM mobile communication system. It has the effect of improving the reliability in the transmission and transmission of the fax signal.

Description

A method of transmitting fax data by variable flag length of a gsm system {A METHOD AND A APPARATUS OF FAX DATA WITH VARIABLE FLAG LENGTH FOR GSM SYSTEM}

The present invention is to transmit the fax data through the GSM mobile communication system, in particular, the transmitting side and the receiving side is transmitted by changing the flag length of the BSI frame data transmitted in each step to suit the wireless environment The present invention relates to a method of transmitting fax data using a variable flag length of a GSM system.

Mobile terminal (MT: MOBILE TERMINAL) is a communication equipment that spreads by the advantage of freely moving and communicating with the other party anytime and anywhere while freely moving in the service area formed by the mobile communication system. In the initial communication using voice signals, data communication of FAX signals such as letters, numbers, symbols, and pictures is possible.

T30 / T32 standard, which is a standard for transmitting fax signals through a landline public telephone system. The T30 standard is for GROUP 3 FACSIMILE, which defines the process of fax data transmission through a general public telecommunication system (DEFINE). The T32 standard defines the data terminal equipment (DTE) for data communications and the RS-232C interface equipment (DCE).

As described above, the T30 / T32 protocol (PROTOCOL) for transmitting fax data using a wired public communication system is not suitable for applying to GSM PLMN (PUBLIC LAND MOBILE NETWORK), which is a GSM wireless communication system without modification. There is a problem of losing data.

Therefore, there is a need to develop the T30 / T32 GROUP 3 FAX protocol suitable for a GS mobile communication system.

Hereinafter, a fax data transmission method of a conventional SMS system will be described with reference to the accompanying drawings.

1 is a functional configuration diagram of a GSM mobile communication system for transmitting fax data, and FIG. 2 is a flowchart of a fax data transmission process of a GSM system according to the prior art.

Referring to FIG. 1, a SMS mobile communication system for transmitting fax data includes a data terminal (TE: TERMINAL EQUIPMENT) 10 that inputs, generates, processes, displays data on a display unit, and outputs the data as FAX data. )and; A mobile terminal (MT: MOBILE TERMINAL) 20 which converts fax data applied from the data terminal 10 into a GSM signal and wirelessly outputs the sms signal; A base station (BTS) that wirelessly connects to the mobile terminal 20 and transmits and receives various communication signals including fax data and forms a mobile communication service area; A base station controller (BSC) 40 for controlling and monitoring the base station 30; Matching unit (TRAU: TRANSCEIVER RATE ADAPTER to match the data transmission rate by converting the data transmission rate of the signal input from the base station controller 40 and at the same time converting the data transmission rate of the signal output to the base station controller 40) UNIT) 50; GSM MOBILE SWITCHING CENTER (GMSC), which is connected to the matching unit 50, analyzes a call setup request signal, establishes a communication path by switching processing, and controls and monitors the operation of the entire GSM mobile communication system (GMSC). 60); An IWF (INTER WORKING FUNCTION) 70 for connecting with the mobile switching center 60 and for connecting with various application functions; A public telecommunication network (PSTN) 80 which is connected to the mobile switching center 60 and connects the established communication paths; A fax device 90 is connected to the public telecommunication network 80 to process and output an incoming fax signal.

Hereinafter, a detailed description will be given of a fax data transmission apparatus by a GSM mobile communication system having the above-described general configuration. The data terminal (TE) 10 inputs, generates, or processes data to be transmitted by fax, and processes as described above. Since the fax data is output to the mobile terminal 20, it transmits to the base station 30 as a radio signal.

The mobile terminal 20 is a mobile communication terminal, which can move freely with the data terminal 10 in the service area formed by the base station 30 and immediately communicate with the other party through a wireless connection. ) Wirelessly transmits the fax signal output by the base station 30 to the base station 30.

Since the base station 30 applies the received fax signal to the matching unit 50 through the base station controller 40, the data transmission rate is changed in the matching unit 50, and the fax having the data transmission rate changed as described above. Since the signal is fax data analyzed by the mobile switching center 60, the signal is applied to the FAX ADAPTER provided in the IWF 70, switched to set the corresponding communication path, and the fax through the communication path set as described above. Send the fax data of the adapter.

The public communication network 80 transmits the fax data to the fax apparatus 90 connected to the established communication path, and the fax apparatus 90 receives and outputs the fax data, thereby confirming and confirming the information as information. Will be used.

As described above, the fax data processing transmitted in the wireless environment between the GSM mobile terminal 20 and the base station 30 is applied to a standard GROUP 3 FAX protocol applied in a general wired communication network.

Hereinafter, with reference to the accompanying Figure 2, a description will be given of the fax data transmission processing procedure of the conventional GSM system.

The mobile terminal 20 of the GSM system includes a first step (S10) of determining whether to wirelessly transmit the fax data input through the data terminal 10; If the mobile terminal 20 determines to transmit the fax data wirelessly by determining in step S10, the mobile station 20 analyzes the call connection request signal applied from the mobile terminal 20 and sets the call. Two steps (S20); Third step (S30) of pre-processing negotiation and training such as data transmission speed, demodulation method, etc. in order to transmit the fax data to the connected fax device 90 through the call set in step S20. )Wow; A fourth step (S40) for determining whether the preprocessing by the step (S30) is normally completed; If the pre-processing is successfully determined by the step (S40), fax data is wirelessly transmitted between the mobile terminal 20 and the base station 30 of the wirelessly connected GSM mobile communication system, and finally the fax device 90 Transmitting to the fifth step (S50); A sixth step (S60) of post-processing for transmitting the fax transmission completion and a confirmation signal when the transmission of the fax data is completed in the step (S50); In step S60, the mobile terminal 20 confirms the completion of the fax transmission and processes the call connection blocking requested by the mobile terminal 20 to block the communication path between the mobile terminal 20 and the base station 30. Is done.

Hereinafter, the above-described configuration will be described in detail the fax data transmission processing procedure of the conventional SMS system.

When receiving the fax data from the data terminal 10, the portable terminal 20, when the fax data is to be transmitted (S10), a matching unit with the base station 30 and the base station controller 40 that is wirelessly connected by the GS method A call setup request signal is transmitted to the mobile switching center 60 through 50.

The mobile switching center 60 that has received the call setup request for fax data transmission as described above sets up the corresponding call (PHASE A) (S20) and controls the fax adapter provided in the IWF 70, thus providing a T30 / T32 protocol. By the preprocessing, such as the transmission speed of the fax data, the modulation and demodulation method, the fax number, whether the fax can be received (S30), and determines whether the preprocessing is completed (PHASE B) (S40).

If the preprocessing is completed in the determination (S40), the fax data is transmitted (PHASE C) in the state of synchronizing (SYNCHRONOUS) (S50). If the fax data transmission is completed, a signal indicating the end of the transmission process ( EOP: END OF PROCEDURE and a post processing (PHASE D) for transmitting a confirmation signal (MCF: MESSAGE CONFIRMATION) are performed (S60).

When the post-processing as described above is completed, the mobile terminal 20 transmits a call blocking request signal (DCN: DISCONNECT) to the mobile switching center 60, so that the connected call is blocked (PHASE E) (S70).

In this case, when the preprocessing PHASE B is not normally completed as determined in the fourth step S40, the fax data by PHASE C cannot be transmitted and the process proceeds to the end.

As described above, the signals transmitted and received in each step are transmitted by the BCS format, and each BCS format signal is distinguished by a flag (FLAG) signal in which OX7F is recorded. If this occurs, the BCS signal will not be recognized.

The T30 / T32 protocol applied for transmitting fax data in the GSM mobile communication system transmits fax data through a wired communication network, and does not consider a wireless environment by a GS mobile communication system.

In the method of transmitting the fax data signal, there is a NON TRANSPARENT FAX method for requesting retransmission, and a TRANSPARENT FAX method for requesting retransmission when the receiver does not receive the signal transmitted from the transmitter.

In particular, in the TRANSPARENT FAX method in which the receiving side does not request retransmission even when a signal to be transmitted is not received, there is a problem of releasing and terminating the connected call of fax transmission immediately without considering the radio environment at all.

That is, in the pre-processing (PHASE B) process of the third step (S30), the digital ID number (DIS: DIGITAL IDENTIFICATION SIGNAL) transmitted from the base station 30 by the poor surrounding wireless environment, the mobile terminal 20 If you do not receive), so proceeds to the end immediately, there is a problem that does not consider the wireless environment.

According to the present invention, when the fax data is transmitted using the B30 format of the T30 / T32 protocol in the GS mobile communication system, the flag length is changed in consideration of the wireless environment, and thus the SMS system is configured to transmit the correct fax data. It is an object of the present invention to provide a fax data transmission method using a variable flag length.

The present invention has been made in order to achieve the above object, the first step of determining whether the non-CS format signal is input from the other party connected to the GSM system; A second step of determining whether all of the flag signals are detected when the non-Cess format signal is inputted in the step; A third step of judging whether an error is detected by the FSP region when the flag signal is detected in the step; If it is determined in the above process that the error is not detected in the fCS area, the fourth process performs a corresponding process on the input BESS format.

Hereinafter, according to the present invention, a fax data transmission method using a variable flag length of a GS system will be described with reference to the accompanying drawings.

In order to explain the present invention, FIG. 3 is a diagram illustrating a configuration of a non-CS format signal, FIG. 4 is a flowchart of a non-CS format signal transmission between a fax sender and a receiver, and FIG. Flowchart of fax data transmission method using variable flag length of SM system.

Referring to FIG. 3, a BCS (BINARY CODED SIGNALING) format generated in the process of transmitting / receiving fax data is configured for SYNCHRONOUS. It consists of BCI (BINARY CODED INFORMATION) consisting of binarized fax information.

The BCI is for distinguishing each format frame data, and a flag (FLAG) area composed of OX7E is provided at the beginning and the end of the frame, and the address (ADDRESS) area in which the transmission destination address is recorded, and the control signal. A control area for recording a message, an FCF (FACSIMILE CONTROL FIELD) area for recording a fax control signal, a 64-bit (FIFSIMILE INFORMATION FIELD) area for recording information to be transmitted, and a frame unit. It consists of a FCS (FACSIMILE CHECKING SEQUENCE) area that checks the occurrence of an error in the signal transmitted to the network.

The FCF region and the FIF region of the frame are also called an HDLC information field.

In the case of transmitting / receiving fax data by applying the T30 / T32 protocol to a GSM mobile communication system, all the corresponding control signals and information data are transmitted by the frame of the BCS format.

The BSI format divides a frame and a frame only by a flag FLAG, and the frames are difficult to lose or error in a radio section, and thus, frame analysis is difficult.

In addition, the current GSM mobile communication system does not allow a non-transactional method that requires retransmission of frame data in which a transmission error or a problem occurs in fax data transmission, and uses a TRANSPARENT method that allows only one-sided transmission. Since there is no correction process of transmission error, it is difficult to ensure the reliability of the transmitted data.

Hereinafter, with reference to the accompanying FIG. 4, a procedure of transmitting a non-CS format signal between a fax sender and a receiver in a GSM mobile communication system will be described.

A call establishment process (ST100) for connecting a communication path with a receiving entity from a fax transmitting entity (ENTITY) connected to the GS mobile communication system; Transmitting a ring signal to recognize that the called party is called through the call set in the process (ST110); Recognizing that the receiving entity has been called and transmitting a unique ID number of a DISS (DIGITAL IDENTIFICATION SIGNAL) signal to the transmitting side (ST120); The transmitting entity receiving the signal of the process transmits a DCS (DIGITAL COMMAND SIGNAL) signal of a non-CS format to the receiving entity (ST130); Transmitting a signal of the above procedure and transmitting a training check signal (TPC) in a BCS format for training confirmation to a receiver (ST140); Transmitting a CFR (CONFIRMATION TO RECEIVE) acknowledgment signal of a non-CS format indicating that the signal by the above procedure has been received (ST150); A training process (ST160) for synchronizing the transmitting side and the receiving side; Synchronizing with the above process and transmitting the fax information data from the transmitting side to the receiving side (ST170); Transmitting, by the transmitting side of the process, an RTC (RETURN TO CALL) signal of a non-CS format (ST180); Transmitting an END OF PROCEDURE (EOP) signal of a non-CS format to the receiving end, indicating that the fax data transmission of the above process is completed (ST190); A step (ST200) of transmitting a MCS (MESSAGE CONFIRMATION) signal of a non-CS format to confirm reception of the message of the above procedure to a transmitting side; Recognizing the confirmation signal of the above process, the transmitting side transmits to the receiving side a DCN (DISCONNECT) signal of the non-SSI format requesting the call release (ST210); The transmitting side which has transmitted the signal of the above process is composed of a step ST220 of releasing a call CALL with the connected receiving side.

In the GS-type mobile communication system having the above-described configuration, a BCS format signal transmission sequence transmitted and received between a fax sender and a receiver will be described in detail.

The fax data transmitting side is called by PHASE A, and when a call is made by dialing the other entity (ENTITY) to receive the fax data signal, the SMS system sets up a call (ST100) and through the call set as described above. Since the ring signal (RING SIGNAL) is transmitted to the receiver, the receiver receiver recognizes that the called party is called (ST110).

Recognizing that the called party is called as described above, the other party's receiving party is based on PHASE B, and wirelessly transmits a DIS response signal to a transmitting party in BCS (BINARY CODED SIGNALING) format indicating a digital unique number (ST120). In addition, the transmitting entity wirelessly receiving the signal through the wireless environment of the SMS mobile communication system wirelessly transmits the DCS signal to the other party through the SMS system (ST130), and again transmits the TCF signal as a TRAINING. (ST140).

The transmitting side transmits the DCS signal after receiving the DIS signal from the receiving side. In the GSM mobile communication system, the TRANSPARENT method, which does not allow retransmission of the fax signal, has a poor wireless environment. If the DIS signal is not received at one time, the DCS signal and the TCF signal cannot be transmitted.

The DCS signal is a NEGOTIATION signal, and provides a criterion for receiving and processing fax data at the receiving side, such as a size of a fax document to be transmitted, a data transmission speed, a modulation / demodulation method, and the like. Is sent in the form.

Since the receiving side transmits the CFR signal that has received the DCS signal and the TCF signal transmitted by the transmitting entity (ST150), the receiver performs a preprocess PHASE B.

If the PHASE B is successfully completed through the SMS system as described above, since the wireless line is in good condition, since the TRAINING is performed by the PHASE C, the transmitting side and the receiving side synchronize (SYNCHRONOUS) (ST160). At the same time, the fax data is wirelessly transmitted from the transmitting side to the receiving side through the SMS system (ST170). When the transmission of the fax data is completed, the RTC signal is transmitted from the transmitting side to the receiving side (ST180).

When the fax data transmission is completed by PHASE C as described above, the sender entity transmits the EOP signal to the receiver by post-processing by PHASE D, and wirelessly notifies that the fax data transmission process is completed (ST190). The receiving entity receiving the wireless notification, such as the wireless transmission of the MCF signal to confirm the transmitting entity (ST200).

When the post-processing is completed by the PHASE D as described above, the call connection is released by the last PHASE D, and the DCN signal of the call blocking request is transmitted from the transmitting side to the receiving side (ST210), and the transmitting side is connected. The call is released from setting (ST220).

As described above, it is generated to transmit the fax data between the transmitting side and the receiving side, and all control signals including the fax data are recorded and transmitted in HDLC format by the FCF region and the FIF region of the BSI format.

As described above, each BSI format signal is transmitted according to the TRANSPARENT method of the GSM mobile communication system, and when the corresponding signal of each step is transmitted to the counterpart without error, the following procedure is performed. If there is an error in the signal or if it is not transmitted, the next sequence of processing will not proceed.

As described above, even if a transmission error occurs due to a poor wireless environment in the TRANSPARENT method, the communication interruption occurs because there is no retransmission. Such a transmission error may be performed in each frame unit, especially when an error is detected in a flag region. Occurs because signals cannot be distinguished

Detecting the poor wireless environment as described above and varying the length of the flag signal, a fax data transmission method according to the variable flag length of the GS system according to the present invention will be described with reference to FIG.

A first step (S110) of determining whether a BCS (BINARY CODED SIGNALING) format signal is input from a counterpart entity (ENTITY) connected to a GSM mobile communication system;

In operation S120, when the non-CSI format signal is input from the counterpart entity by determining in the first process S110, whether a flag FLAG signal provided at each of a start part and an end part of a frame is detected. and,

When the flag FLAG signal is detected in the second process S120, an error occurs in units of frames by the FRCS CHECKING SEQUENCE region of the BCS format. A third step (S130) of checking and determining whether an error is detected and recorded;

If it is determined in the third step S130 that an error of a frame unit is not detected in the FCS region, a fourth step of analyzing an input BCS format signal and processing a corresponding response as a BSI format signal S140. )and,

When the flag FLAG signal is not detected from the non-CS format signal inputted by the second process S120, and an error is detected in the FCS region by the third process S130. A fifth process (S150) for determining whether a predetermined number of times has been set;

If the predetermined number of times determined by the fifth process (S150) does not occur, the length of the flag area indicating the start and end of the BSI format is changed, and the variable flag FLAG length is applied as described above. A sixth process S160 of retransmitting a BCS format signal is performed.

Hereinafter, according to the present invention, a fax data transmission method using a variable flag of a GSM system will be described in detail.

The fax data and the corresponding control commands, which are transmitted through the GSM mobile communication system, are transmitted for each process by the BCS format.

The transmitting and receiving sides of the fax data through the GS system determines whether the BESS format signal for each process is input (S110), and when the BCS format signal is input in the determination (S110). In operation S120, it is determined whether all of the flag signals of the start part and the end part of the frame unit are detected.

When the flag region signals of the beginning and end portions of the non-CS format signal are detected in the determination (S120), the corresponding frame signal of the non-CS format is received, and the FCS region of the received frame signal is examined as described above. Therefore, it is determined whether an error (ERROR) exists in the received frame unit signal (S130).

If there is no error in the determination (S130), since the signal is normally input, the corresponding signal input by the BESS format is analyzed, and the signal to be transmitted to the fax data transmission counterpart in the following order is the same as above. Corresponds with the transmission by the signal in the non-ciss format.

In addition, when it is determined in the second process (S120) that the respective flag signals indicating the start and the end of the frame unit cannot be detected, the corresponding frame signal is not detected, and the third process (S130). In operation S150, when the FCS region of the detected frame signal detects an error from the frame unit signal, a predetermined number of times is determined.

The predetermined number of times may be three or ten times, for example, and an appropriate number of times is arbitrarily set according to the wireless environment of the GSM system.

If it is determined in the fifth step (S150), the predetermined number of times, the transmission of the fax data due to the transmission error in the corresponding wireless environment of the GS system is difficult to end.

In addition, when it is determined in the fifth process (S150) that the predetermined number of times does not reach, the frame unit start of the non-ces format signal transmitted to the counterpart before the non-ces format signal of the first process (S110) is input. And the length of the flag area displayed at the end and the like, for example, 2 times, 3 times, 4 times, etc. variablely retransmitted to the other party (S160).

In the process (S160), the variable flag length is, for example, variable flag length twice when retransmitted once, variable flag length triple applied when retransmitted second, and third retransmission The variable length of the flag is 9 times variable, and the variable length of the flag is applied to find a value suitable for the wireless environment of the GS system by repeated experiments.

Accordingly, the present invention having the above-described configuration is used for negotiation between a transmitting entity and a receiving entity in a TRANSPARENT type SMS system which does not allow retransmission in transmitting fax data. It reliably wirelessly transmits the corresponding frame signal of the BSI format and retransmits it for the wireless environment, thereby ensuring the reliable transmission of the fax data.

According to the present invention having the above-described configuration, when fax data is transmitted using a GSM mobile communication system, the BSS frame signal having a variable flag length is repeatedly retransmitted, thereby improving industrial reliability. .

In addition, even in a poor wireless environment of the GS mobile communication system there is a convenient effect in transmitting the error-free BSI frame signal.

1 is a functional configuration diagram of a GSM mobile communication system for transmitting fax data;

2 is a flowchart of a fax data transmission process of a conventional GMS system;

3 is a configuration diagram of a non-cis format signal;

4 is a flowchart for transmitting a non-CS format signal between a fax sender and a receiver;

5 is a flowchart illustrating a method of transmitting fax data using a variable flag length of a gsm system of the present invention.

          ** Explanation of symbols on the main parts of the drawing **

10: data terminal 20: mobile terminal

30: base station 40: base station controller

50: matching unit 60: mobile switching center

70: IWF 80: PS

90: fax machine

Claims (8)

A first process of determining whether a non-CS format signal is input from a counterpart connected to a GSM system; A second step of determining whether all flag signals are detected when the non-Cess format signal is input in the above process; A third step of determining whether an error is detected by the fps area when the flag signal is detected in the step; And a fourth step of performing a corresponding process according to the input BCS format if it is determined in the above process and does not detect an error in the BS region. According to claim 1, A fifth step of determining whether a predetermined number of times has been reached in the case where all the flag signals are not detected from the BCS format signal determined and determined in the second process, and when an error is detected in the FSE region by the third process. Process, And a sixth step of retransmitting the BESS format signal to which the variable flag is applied when the predetermined number of times determined by the above process is not reached. The method of claim 1, wherein the input BSI format signal is: Method for transmitting fax data according to a variable flag length of the GSM system, characterized in that all signals separated by the flag between the sending and receiving sides of the fax data connected to the GSM system is included. The method of claim 1, wherein the second process comprises: And determining whether to detect all flag area signals provided at each of a start portion and an end portion of the input BSI format signal, respectively. The method of claim 1, wherein the third process comprises: A fax according to a variable flag length of a gsm system, characterized in that the occurrence of a frame error of the BCS format signal is checked by the FCS region of the input BCS format signal and it is determined whether an error has been detected. Data transmission method. The method of claim 1, wherein the fourth process, And all corresponding processes for analyzing the input BSI format signal and responding to the BSI format signal. The method of claim 2, wherein the sixth process is And retransmitting a flag area indicating a start and an end of the BSI format signal repeatedly a predetermined number of times. The non-ciss format signal retransmitted in the sixth process includes: And a non-CS format signal transmitted in a previous step of the input BSI format signal.