JPH04196663A - Method of mobil object communication - Google Patents

Abstract

PURPOSE:To prevent the leakage of communication content by regularly or irregularly rewriting identification information via communication. CONSTITUTION:An RF communication control section 2b-1a is provided with an RS 232 interface function, a ROM or the like storing the identification information for a facsimile equipment 3 and the identification information for a data terminal equipment 4. When an originating station is requested to change the identification information, a new identification information is accepted besides an old identification information by the station. Then the new identification information is tentatively stored with the old identification information. Every time communication is carried out, the old identification information and the new identification information are transmitted and if the identification information from an incoming station is the old identification information, an identification information rewriting instruction is transmitted. Upon confirmation that all information for the incoming station is rewritten into the new identification information, the old identification information in the originating station is erased and from the next communication the new identification information is used. Thus the leakage of the identification information content caused by hearing from a radio transmission line is prevented.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a communication method for mobile communication used for facsimile communication or data communication using a business wireless telephone system, automatic squad telephone system, etc. as a transmission path; In particular, the ID code is used to automatically determine the facsimile communication mode or data communication mode, and the contents of the ID code are automatically determined! The present invention relates to a communication method for mobile communication that can be changed.

(Prior art) Conventionally, as a technology in this field, patent application-P02-2
As stated in the specification of No. 1507, etc., the following is as follows.
Its configuration will be explained using figures.

FIG. 2 is a schematic functional block diagram showing an example of the configuration of the mobile communication facsimile communication system described in the above document, and FIG. 3 is a functional block diagram showing an example of the configuration of the communication adapter in FIG. It is.

First, in FIG. 2, this facsimile communication system for a mobile object is installed in a mobile object such as a car,
A car telephone device 1 is provided.

The car telephone device 1 includes a radio 1a and a telephone 1b'c.
and is connected to the communication adapter 2 via cable A. Cable A is an interface for a large-capacity car telephone device, and is an interface for a predetermined data format j~.
'It consists of a downlink serial data line, a transmission signal line, a reception signal line, etc.

The positive storage line and downstream serial data line are off-hook signals,
Used for propagation of dial signal S3 and incoming signal, etc.
Transmission and reception signal lines are used for analog audio propagation.

2 communication adapter 2 is connected to CC via table B.
iTT (International Telegraph and Telephone Advisory Committee) recommends standard Bl=03 facsimile device 3 is connected. Cable B is a cable equipped with a two-wire loop dial interface.

Next, in FIG. 3, this communication adapter 2 is connected to an NCU (N
The cellular modem 2a has a built-in network control unit) and has a received data error correction control function and a modulation/demodulation function, and a controller unit 2b and a V27ter modem 2c are sequentially connected to the output side of the cellular modem 2a.

The controller unit 2b includes an RF communication control unit 2b that performs near) control of the cellular modem 2a, a main control unit 2b-2 composed of a CPU, ROM, etc., and a G3 communication control unit that has a function of controlling the facsimile device 3. It is composed of a section 2b-3. ■27 i, e r modem 2c is CCI-T
It has functions such as an interface for the G3 communication control unit 2b-3 in accordance with the recommendations of the G3 communication control unit 2b-3.

Further, a central office line section 2d is connected to the output f of the V27ter modem 2c. The station fc unit 2d is equipped with a general telephone subscriber signal format and receives a calling signal S1 and a dial tone S2.
It also has an interface function with the facsimile machine 3, such as detecting the dial signal S3.

The cellular modem 2a is connected to the car telephone device 1 via the cable A, and the central office line section 2d is connected to the facsimile device 3 via the cape/'kB.

Here, the calling signal S1 has a frequency of 400Hz equal to or higher than 15H2.
The signal is modulated at 0 Hz or less with an intermittent ratio of 20 IPM and a make rate of 33.

The dial tone S2 is a continuous signal of 400 Hz, and the dial signal S3 is 110 PP or 20 PPm.

A conventional facsimile communication method implemented using the facsimile communication system in a mobile body configured as described above will be described.

In order to make a call from the telephone 1b of the car telephone device 1 to a specific receiving station and send a document using the facsimile device 3,
The following methods are performed sequentially.

(1) Place the original to be sent on the facsimile machine fei:3.

(2) Dial from the dial key of the facsimile machine 3 to place a call to the destination station.

(3) Response signal (2) from the receiving station via communication adapter 2
100Hz>, then operate the start key of the facsimile machine 3.

When the above method is implemented, the mobile facsimile communication system shown in FIG. 2 operates as follows.

In the above method (3), when the facsimile device 3 dials the destination station, the facsimile device 3 outputs an off-hook signal and almost simultaneously outputs a dial signal S3. The communication adapter 2 detects these signals and converts them into the signal format (
After converting the data into upstream serial data (in a predetermined format), it is output to the radio device 1a via cable A. This establishes a line connection with the destination station.

After that, the communication adapter 2 receives the response signal (21
00Hz>, the communication adapter 2 is switched to facsimile overtransmission mode, and a handshake sequence for establishing a data link is started between the cellular modem 2a and the modem of the receiving station. When a mutual link is established, the RF communication control unit 2b is notified of this.

Next, the main controller 2b-2 controls the V27ter modem 2c to send the response signal (2100Hz>) generated by the V27ter modem 2c to the facsimile device W3. Facsimile communication is started between the facsimile device 3 and the device of the destination station.

The communication procedure from this point on is based on CCITT Recommendation T,
30 Phases B (Brimesage Hand [), C (Message Hand H>, D (Post Message Hand MA>)
, EC call cancellation).

(Problems to be Solved by the Invention) However, the above communication method has the following problems.

Even if facsimile communication is possible in addition to voice calls in an automatic warehouse etc., data communication in addition to voice calls and facsimile communication can be realized with one telephone line by using communication adapter 2 and car telephone device 1. For example, if the cellular modem 2a of the communication adapter 2 is connected to R323, which is the standard interface of the Electronic Industries Association of America (EIA).
Even if the 2C interface function is added, at the receiving station,
It is not possible to determine whether the originating station's request is for facsimile communication mode or data communication mode.
Furthermore, since there is no response from the terminating station at the originating station,
There was a problem that communication could not be established.

The present invention addresses the problem of the prior art, since it is not possible to distinguish between the facsimile communication mode and the data communication mode, so the present invention adds a data communication function in addition to the facsimile communication function to realize communication between the two. The purpose of this invention is to provide a communication method that solves the problem that it is impossible.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a communication adapter for an interface connected to a terminal device including a facsimile machine, and a communication line between a receiving station in a mobile body and a wireless transmission path. After connection, a data terminal device is connected to the communication adapter as the terminal device in a communication method of mobile communication in which messages are exchanged under specific conditions to establish a link and perform predetermined communication with the destination station. In addition, a plurality of pieces of identification information for identifying the terminal device are prepared in advance, and after the link is established, the old identification information and new identification information among the plurality of pieces of identification information are transmitted to the receiving station, and the old identification information If the same identification information is received from the terminating station, an identification information rewriting command is sent to the terminating station, and after acknowledging the receiving station's reception of the male side information rewriting command, the terminating station is sent the When new identification information is sent and the same identification information as the new identification information is received from the terminating station, the process of changing the IE identification information to the new identification information performed at the terminating station. After confirming completion, the old identification information is deleted and the communication is performed with the terminal device corresponding to the new identification information.

(Function) In the present invention, since the communication method for mobile communication is configured as described above, immediately after the line is connected and the facsimile communication mode or data communication mode is entered, the originating station transmits predetermined identification information and receives an incoming call. It waits for a response from the station, and if the response is the same as the transmitted identification information, transmission and reception of facsimile information or data information is immediately started. In this way, it is possible to determine whether the mode is facsimile communication mode or data communication mode based on the identification information.

Furthermore, when a change in identification information is requested, the originating station receives the new identification information in addition to the old identification information and temporarily stores it together with the old identification information until the identification information of all terminating stations has been rewritten. The old identification information is not deleted, and each time there is communication, the originating station sends the old identification information and new identification information, and if the identification information from the receiving station is the old identification information, it sends an identification information rewriting command. to rewrite the identification information of the called station. At that time, the receiving station erases the old identification information and responds to the next communication with the new identification information. After confirming that all terminating stations have been rewritten with the new identification information, the originating station erases its own old identification information and uses the new identification information from the next communication. Therefore, the above problem can be solved. It can be solved.

(Embodiment) FIGS. 1(a) and 1(b) are communication flowcharts for explaining a communication method of mobile communication according to an embodiment of the present invention, in which (a> is a flowchart of a transmitting station, The same figure (b
) is a flowchart of the receiving station. Figure 4(a)-(
ci) is a communication sequence diagram for explaining a communication method of mobile communication according to an embodiment of the present invention;
is a sequence diagram of a transmitting station in facsimile communication, and (b) is a sequence diagram of a transmitting station in data communication.
FIG. 4(c) is a sequence diagram of a receiving station in facsimile communication, and FIG. 2(d) is a sequence diagram of a receiving station in data communication. Note that this communication method for the mobile body fl@ is implemented using the total communication system shown in FIG. The configuration will be explained below.

FIG. 5 shows an i! total communication system for carrying out a communication method for mobile communication according to an embodiment of the present invention. The configuration diagram of A and FIG. 6 are configuration diagrams of the receiving station 40 in FIG. 5, and the same elements as in FIG. 2 are given the same reference numerals.

In FIG. 3, this total communication system has a transmitting station 10, and the transmitting station 10 is a general exchange telephone RI420.
It is connected to the car telephone system 30 via.

The originating station 10 is composed of a facsimile device 10a, a data terminal device LOb, and a communication adapter 10c'C. Except for this, the communication adapter 2 is the same as the communication adapter 2 shown in FIG. Here, the general subscriber telephone line interface is if
A function to close the subscriber line when transmitting a dial signal to the FF edge, a function to detect a ringer when a ring signal arrives from the line side and close the subscriber line, and various other functions. This interface has so-called NCU functions, such as a function to release the subscriber line when communication ends.

Further, the car telephone system 30 includes a car telephone exchange,
Wireless base stations, and nothing! Consists of one line fiI control station, etc.
It is connected to a plurality of receiving stations 40 via a wireless transmission path.

6 is a block diagram of the receiving station 40 in FIG. 5, and FIG. 7 is a block diagram of the communication adapter 2 in FIG. 6. Elements common to those in FIG. has been done.

This mobile communication system is different from the conventional system shown in FIG. The difference is that RF communication control sections 2b and 2a having different functions are provided in place of section 2b, and the other components have the same configuration as in FIGS. 2 and 3. here,
The RFi communication control units 2b and 2a are equipped with an FjS 232C interface function, and also have an ID code (F) that is identification information for the facsimile machine 3 and an ID code (D) that is identification information for the data terminal device 4. ). Cable C is an interface cable EI between data terminal device A and RF communication control units 2b, a.
A R5232C, and cellular modem 2a,
Operations between the RF communication control section 2b and the data terminal device 4 are executed using the Haze AT command.

The mobile communication system configured in this way has a transmitting station 1.
0 and the receiving station 40 have the same functional configuration and communicate according to wireless data error correction control.

Next, Figure 1 (a>, (b) and Figure 4 (a) to (d)
The mobile communication communication method of this embodiment (A>
~(F) will be explained. In order to simplify the explanation, common elements of the respective devices of the originating station 10 and the terminating station 40 will be denoted by the same reference numerals.

(A') Facsimile machine S sending station 10 sequence In FIG.
An off-hook signal and a dial signal are sent from the facsimile device 3 to the office line section 2a of the communication adapter 2. After the station line section 2d detects these signals, the RF communication control section 2b
, to the cellular modem 2a dial command ATD'l
- The dialed number is sent. The cellular modem 2a sends an off-hook signal to the car telephone system 30 via the general telephone line 20, and almost simultaneously sends a dial signal,
It waits for a ringback tone (hereinafter referred to as RBT) and a response signal (2100 Hz>) from the terminating station 40. From then on, the line is connected to the terminating station 40.

When the cellular modem 2a of the transmitting station 10 receives these signals, it transmits FL B T to the facsimile machine 3.
Do 1. Then, the communication adapter 2 is changed to facsimile communication mode (5), and a handshake sequence for establishing a data link is started between the cellular modem 2ari of the originating station 10 and the receiving station 40. As a result, when a mutual link is established, the cellular modem 2a of the originating station 10 establishes the link 11Gc.

NNECT (meaning that communication with the other party is now possible) is output to the RF communication control unit 2b. In response, the RF communication control unit 2b transfers the ID code (F) assigned to the facsimile communication as data to the destination station, and waits for the same ID code (F) to be returned. At this time, if you can receive the code from the same person, immediately R
The BT is stopped and a response signal is sent to the facsimile machine 3.

From this point on, the operations of the communication adapter 2 and facsimile device 3 proceed according to the phase B procedure in accordance with the recommendations of CCITT T2O and G30. In other words, a response signal and a DXS signal (Digital ID) are sent from the communication adapter 2.
identification signal (digital identification signal) is continuously transmitted. On the other hand, when DC5 (digital command signal) is returned from the facsimile device 3, a DTC signal (digital transmission command) is output. After such messages and messages are exchanged according to the procedure of phase B, the facsimile machine 3 reads the original to be transmitted and the sequence moves to transmitting the image data that is the contents thereof. Further, communication proceeds between the cellular modem 2a and the cellular modem of the receiving station according to data error correction control.

(B) Data communication transmitting station 10 sequence Figure 4 (b)
, the communication program of the data terminal device 4 is loaded and the DTRON signal and the dial command ATD*dial number are sent to the RF of the communication adapter 2 via the cable C.
It is transmitted to the communication control unit 2b. When the RF communication control unit 2b receives these signals and recognizes that the data communication is by the data terminal f4, almost at the same time, it transfers the previous dial command ATD"-dial number as it is to the cellular modem 2a.Cellular modem 2a converts the dial number of the received dial command ATDτ dial number into data format for mobile phone and sends it to car@talk system 30'\ via general telephone line 20.

The cellular modem 2a is RBT, response signal 4y (210OHz
> and upon receiving C0NNECT upon link establishment, R
All signals except RBT are sent to the F communication control unit 2b. As a result, the ID code (D>) assigned to the data terminal device 4 from the RF communication control unit 2b is
a to the radio 1a. If the receiving station 40 receives the ID code (D> and determines that the communication is data communication), it returns the same ID code (D> to the originating station 1o. As a result, the RF communication control unit 2o of the originating station 10 , receive the same ID code (D>) from the cellular modem 2a.

゛Then, a response signal is sent from the RF communication $■ control section 2b, C0.
The NNECT and DSRON signals are sequentially sent to the data terminal device f4. After this, data communication begins.

(C) Terminating station 40 sequence of facsimile communication In FIG.
Waits for an incoming call display signal from the wireless device 1a7J) of the car telephone device 1. Cellular modem 2a that does not receive the incoming call display signal
sends a response code RING to the RF communication control unit 2b. On the other hand, the RF communication control unit 2b uses the code A.
The TA is sent to the cellular modem 2a. Cellular modem 2a
In response, it outputs an off-hook signal and a response signal (2100 Hz>) to the radio 1a.Then, it waits for a link establishment code C0NNECT.

From this point on, the same sequence as in FIG. 4 (a>) is performed.

(D) Data communication receiving station 40 sequence Figure 4 (d)
At this point, the program of the data terminal device 4 of the receiving station 40 is loaded and the cellular modem 2a waits for an incoming call display signal from the wireless device 1a. From then on, communication with the calling station 10 is performed through the same sequence as shown in FIG. Exchange IDs. If it matches, the code R engineering NG is transferred to the data terminal device 4,
Next, as soon as I received the ATA and returned the CoNNEC knife,
Enter data communication.

In data communication, if the data terminal device 4 of the receiving station 40 is 1) TROFF, the RF communication control section 2b of the receiving station 40 returns a negative signal NAK of the ID code to the originating station and starts communication. ends.

(E) Operation of the transmitting station 1o when changing the ID code In FIGS. 1(a) and (b>, changing the ID code,
The data terminal device 4 sends a write command of 1 and D code to the main control unit 2b-2 via the RF communication control unit 2b. When the main control unit 2b-2 receives the write command (step SL>), the main control unit 2b-2 writes it to a predetermined address in the ROM (step S2>).Then, it connects the line to the receiving station 40 according to a predetermined procedure (step S3).

Once both stations have established a data link, they simultaneously transmit to the destination station 40 the old ID code that is the old Subetsu information that is currently being used and the new ID code that is the new identification information that will be used for writing. (Step 56) Waits for the reception of the ID code, and when the originating station 10 receives the code from the old one (Step S7)
), IDf, which is an identification information 6 conversion command for the receiving station 40.
Step $10> to send an i' change command; upon receiving an affirmative signal (hereinafter referred to as ACK), send a new ID code (step 813)
When the D code is received (step 514), the rewriting of the new code of this receiving station 40 is completed. At this time, the main control unit 2b checks whether all the receiving stations 40 have been rewritten.
This is determined by checking the code of the past receiving station 40 where -2 is stored. If it is not completed, proceed with the procedure of communication start, communication processing (step 519), line disconnection (step 520), and end when communication is to be continued (step 518), and if completed, the new ID code Erase all communications! ! Decide on the rules.

On the other hand, in step S7, if the old ID code cannot be received and the new ID code is received (step S8),
The process moves to continue communication (step 18). Note that step S5. S9. S12. The timeout for Sl is prepared in consideration of areas where communication is not possible during mobile communication transmission.

(F) Operation of the terminating station 40 when rewriting the ID code In FIG. 1(C), the terminating station 40 connects the line in response to the call from the originating station 10 (step 5100>).

Once the data link is established (step 5101), the system immediately enters a waiting state for receiving the old ID code and new ID code. When both ID codes are received (step 5103),
When the main control unit 2b-2 confirms that the old ID code has been deleted (step 5106), the new ID code is transmitted (step 5108).

After that, if you want to continue communication (step 5110),
Communication start, communication processing (step 511B>, line disconnection (
Step 5117), proceeding with the termination sequence, if in step 5103, the old ID code and the new ID
When the D code is not received and only the new ID code is received (step 5104), the new ID code is transmitted (step 5IO7), and the communication is continued thereafter.

Also, in step 5106, if the code exists from the old one, the old ■D code is sent.Step 5LO9
>, upon receiving the @ exchange command from the transmitting station 10 (step 5Lii), transmits an ACK signal (step 51
14) Subsequently, when a new code is received (step 5115), the same ID code is transmitted (step 5118), and the main control unit 2b-2 erases the old ID code and replaces it with the new ID code. Write the code to ROM (
After step 119), the process moves to step 5110 and communication is continued.

This embodiment has the following advantages.

(1) After connecting the line and entering facsimile communication mode or data communication mode, immediately after link establishment, the originating station and the receiving station exchange ID codes to determine if the codes match. It is possible to distinguish between the device 3 and the data terminal device 4 without any operation, and it is possible to automatically receive a call through the communication line 11 and perform facsimile communication or data communication. .

(2) In facsimile communication and data communication, the content of the ID code exchanged between the calling station 5110 and the receiving station 40 is changed periodically or irregularly.
Are you being overheard from the wireless transmission line? The contents of the D code can be prevented from being leaked, and the code can be used to maintain the confidentiality of communications.

(3) When a call is made from the facsimile machine 3 or the data terminal device 4, the type of the calling device can also be determined and this information can be notified to the other party.

Note that the present invention is not limited to the illustrated embodiment, and various modifications are possible. Examples of such modifications include the following.

(a) In the above embodiment, the moving object is a car, but it may be a moving object such as a train. Also, although it was a car phone device,
It is also applicable to general business wireless devices.

(b) Instead of making a call from the facsimile device 3 or the data terminal device 4, a method may be adopted in which a dial call is made from the telephone set 1a of the car telephone device 1, and the off-hook signal is output again after the conversation has started.

(c) The code exchange procedure and determination process can be performed either by using the program of the data terminal device 4 or by using the program of the facsimile machine M3.

(d) Between the RF communication control unit 2b and the cellular modem 2a,
Although the haze AT command for character control is used, for example, a line *i'jA method may be used.

(E) The ID code as identification information may be a number or a combination of a symbol and a number in addition to a symbol.

(f) The timing for rewriting the ID code may be irregular or may be performed periodically for each data communication.

(Effects of the Invention) As described in detail above, according to the present invention, after a line is connected and the facsimile communication mode or data communication mode is entered, identification information is exchanged immediately after link establishment, and the identification +W@ Since it is possible to judge whether a facsimile device or a data terminal device matches each other without any operation, it is possible to automatically receive a call and perform facsimile communication or data communication in one communication cycle. .

In addition, since the mode information is rewritten periodically or irregularly, the identification information of all receiving stations can be easily changed via communication, and leakage of communication contents can be prevented. .

[Brief explanation of the drawing]

1(a) to 1(b) are communication flowcharts according to an embodiment of the present invention, in which FIG. 1(a) is a flowchart of a transmitting station, FIG. 1(b) is a flowchart of a receiving station, and FIG. FIG. 3 is a functional block diagram of a conventional facsimile communication system in a mobile body, FIG. 3 is a functional block diagram of the communication adapter in FIG. 2, and FIGS. 4(a) to (ci>) are communication sequence diagrams of an embodiment of the present invention. Yes, the same figure (a) is a sequence diagram of the originating station in facsimile communication, the same figure (b) is the sequence diagram of the originating station in data communication, the same figure (C) is the sequence diagram of the receiving station in facsimile communication, and the same figure (d) is a sequence diagram of a receiving station in data communication, FIG. 5 is a block diagram of a total communication system according to an embodiment of the present invention, FIG. 6 is a block diagram of a receiving station in FIG. 5, and FIG. 7 is a block diagram of a receiving station in FIG. This is an 8-component diagram of the communication adapter in Figure 6. a・
...RF transmission control unit, 3 ... facsimile machine, 4 ... data terminal device.

Claims (1)

[Scope of Claims] A link is established by exchanging messages under specific conditions after a line is connected to a receiving station in a mobile body via a communication adapter for an interface connected to a terminal device including a facsimile machine and a wireless transmission path. In the mobile communication communication method, a data terminal device is connected to the communication adapter as the terminal device, and a plurality of pieces of identification information for identifying the terminal device are prepared in advance. and, after establishing the link, transmitting the old identification information and new identification information of the plurality of pieces of identification information to the receiving station, and when receiving the same identification information as the old identification information from the receiving station,
After sending an identification information rewriting command to the receiving station and confirming that the receiving station has received the identification information rewriting command, sending the new identification information to the receiving station, and transmitting the same identification information as the new identification information to the receiving station. When received from the receiving station, after confirming completion of the rewriting process from the old identification information to the new identification information performed at the receiving station, erase the old identification information and respond to the new identification information. A communication method for mobile communication, characterized in that the communication is performed with the terminal device.