JPH03171860A - Adaptor for non-telephone communication and facsimile signal relaying method in mobile communication - Google Patents

Abstract

PURPOSE:To prevent communication from being disconnected due to time out by awaiting a signal received following a preamble by turning off a timer when a terminal receives a header signal like the preamble. CONSTITUTION:An instruction signal detecting part 3 informs the content of an instruction by detecting the content of an instruction signal, and a control part 4 triggers a time monitoring part 5. The time monitoring part 5 issues a preamble request at a timing shorter than a time to time out a terminal 1, and the control part 4 triggers a preamble generating part 6 by receiving the request, and transmits the preamble from the preamble part generating part to the terminal 1. A response signal detecting part 7 informs the detection of a response signal from an incoming terminal to the control part 4 when detecting it. Then, the control part 4 stops the preamble, and also, transmits the response signal to the terminal 1. Thereby, it is possible to perform the communication normally without generating the time out of the terminal even when remarkable transmission delay occurs in a radio system.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-telephone communications agbutter equipped in a mobile station and a base station system in order to perform non-telephone communications with high precision in digital mobile communications, and more specifically, to This article relates to an agbuta that eliminates the inconsistency that occurs between protocols specific to non-telephone communication such as #I# and facsimile.
In addition, regarding facsimile connection methods in mobile communications using narrowband digital wireless lines that require insertion/removal control of high-efficiency voice codecs, we particularly focus on 7-axis + 7-connection control signals on transmission lines with relatively large transmission delays. This relates to a relay control method. [Jubei's technology] With the development of mobile communication services such as automatic rate telephones, there is a growing demand for non-telephone services such as facsimile in addition to voice telephones. For example, fax machines are already being used in car rental services. Non-telephone terminals are originally digital signals, but they are designed to have a built-in modem to convert the signal to voice band and use it on public telephone lines, so the simplest form of application to mobile communications is It sends signals from non-telephone terminals instead of voice. Figure 2 shows the application form of the follower, taking 77 kushimiri as an example. The mobile side sends and receives calls to the mobile unit 11 via the switch 12.
13 and facsimile Yasusei 14. The base station side consists of a mobile communication base station system 17, a public telephone network 16, a handset 18 and a 77-kushimiri Yasue 15 connected to it via a switch 19. The base station 17 is composed of, for example, a base station, a control station, and a mobile phone switching center. The mobile device 11 and the base station system 17 are connected via a wireless line. This has a band of 12.5kHz, for example, and is suitable for transmitting analog signals. When making a voice call, connect the handset 13 and the handset 18,
In the s#l interval, this audio signal is transmitted upstream to analog FM, for example. During non-telephone communication, Yasuse 14 and 15 are connected, but since the terminal has a built-in modem and the output signal is equivalent to Ondo, in the SM area, analog FM is used without being aware that it is a non-telephone communication. Transmit. For example, when transmitting from Yasusei 14 on the mobile side, the base station system 17 that received the signal transmits it as an audio signal to the public telephone network 14.
6, and the fixed terminal 15 receives this signal.
Since this signal format is the same as the signal from the transmitting terminal 14, the terminal 15 can restore it normally. In other words, for the terminal, from the mobile device 11 to the public telephone network 16
* In this case, it functions simply as a communication line. In the conventional methods described above, non-telephone numbers are treated as voice and transmitted, which has the disadvantage of poor transmission efficiency and difficulty in ensuring good transmission reliability. For example, in a facsimile, the full-length encoded original signal is a digital signal with a speed of 4.8 kb/s, but this is transmitted by a modem at a bandwidth of 3 kHz.
Convert and output to z signal. In the case of the United States, it is F of the band 12.5kHz in the radio zone.
Modulate to M signal. In other words, tlI directly from the run-length code i! Since it can be sent at 4.8kb/s, it can be transmitted using less bandwidth.

On the other hand, if the same wireless band were used, error correction bits could be added, allowing for more frequent transmission. In other words, the transmission characteristics of mobile communications are much worse than those of telephone lines due to the unique 7-a-zone, so it is difficult to ensure sufficient reliability with conventional methods, but after applying error correction to run-length codes! Km transmission ensures extremely good reliability.

However, this requires modification of the device itself,
MST cannot be realized due to economic and other reasons. The above situation is the same in digital mobile communication systems. Therefore, it is conceivable to install an agbuta for non-telephone communication inside the mobile station and base station system and perform signal processing there. An example of this is shown in Figure 3. Mobile 1fi11 and base station 1k1
7 with adapters 20 and 21. Terminals 14 and 15 are $
Like Figure 2, this is a US-based terminal.

For example, if the terminal is a facsimile, the hair adapter 20 demodulates the signal from the terminal 14, returns it to a run-length code, performs signal processing such as encoding, and then transmits the signal over the radio section. The adapter 21 performs error correction decoding on the received run-length code, and when it is successfully received, modulates this signal into the voice band, returns it to the same format as the signal from the terminal 14, and transmits it to the terminal via the telephone network 16. I will send it to the 15th. In addition to this, it is possible to achieve more reliable transmission than in the Jumei using the same terminal as the Jumei and on the same channel as voice without using a special wireless channel for non-telephone calls. [Invention tries to solve it! II8) For example, in facsimile, etc., it is necessary to send and receive a control signal at the beginning of communication, but in this control signal transmission procedure, in order to receive a response from the other party's terminal after sending the control signal,
Sometimes I set a timer. This is to ensure control when the transmitted signal is not properly transmitted to the other party due to signal errors, etc. That is, after transmitting a signal, the response is monitored for a certain period of time, and if there is no response, reliability is ensured by retransmission or communication is disconnected to prevent the terminal from operating abnormally. However, in the second example above, since the signal is converted once by the adapter, a signal delay occurs, and the above-mentioned timer may time out and disconnect the communication even though there is no particular abnormality in the communication system. ．． To explain a more specific example of a case where a timeout occurs in this way, for example, in a mobile communication system that uses comparatively high-speed digital radio that does not require control of insertion and removal of analog radio lines and voice codecs, When relaying connection control signals and image signals of G type 7 axes (hereinafter also referred to as GmFAX), the timer for non-telephone terminal signals such as GIFAX may go out of timing at the wireless base station or mobile station. There is no. However, when 77x signals are relayed through a transmission line made up of narrowband digital radio lines, voice codec insertion/removal control, speed conversion, and interface conversion are required, and the processing time cannot be ignored. In particular, in mobile satellite communication systems, additional propagation delay time is added, making normal operation of GI[[FAX connection control difficult, resulting in connection failure. Therefore, when performing fax communication over a transmission line with relatively large delays, it is necessary to change the connection control timer value, etc., and use a dedicated FAX that suits the system.
An AX terminal is required. This is not realistic in terms of economy and complexity of handling. In view of the above-mentioned problems, it is an object of the present invention to provide an agbuta that has a function to prevent communication disconnection due to timeout caused by a delay in a response signal during a transmission procedure when a signal delay is large. In addition, when a general-purpose GIFAX is installed and connected to a mobile station in a mobile communication system with a relatively large delay in the transmission path, it is possible to prevent connection failure due to timeout of the FAX connection control timer. In other words, when relaying non-telephone signals, it is necessary to control the insertion and removal of voice codecs in narrowband digital wireless circuit structures, and to prevent the situation in which wireless circuits at wireless base stations and mobile stations The purpose of this research is to realize a connection control method that enables connection control of GI [[FAX] in mobile communication or mobile satellite communication, which has a relatively large interface conversion processing delay and transmission delay. [Means for Solving the Problems] According to the present invention, the above-mentioned objects are achieved by the means described in the claims. That is, the invention of claim 1 is an adapter disposed between a terminal and a mobile phone 11f'1, which includes a command signal detection section from a calling terminal, a response signal detection section from a calling terminal, and a time monitoring section. When the time monitoring unit detects that the transmission delay of the line is large, the preamble is sent to the originating terminal after the command signal is detected, and the preamble is stopped when the response signal is detected. The invention of item M2 is characterized in that it transmits a response signal to a wireless base station in a mobile communication system in which the wireless line is a digital wireless line using a high-efficiency voice codec. It has a function that generates a pseudo-flag signal that is the same as the flag signal included in the frame structure of the 7T Axismi connection control signal at the radio base station and mobile station, and allows the connection control signal from the 7 Axismi + 7 to be generated at the radio base station and mobile station. When received, the control signal is relayed to the digital wireless line by voice codec insertion/removal control, etc., and a suspicion a flag signal is returned to the 7T Kushimi+7 that sent the connection control signal, thereby setting the facsimile connection control timer. The operation is temporarily suppressed, the waiting time for the connection control signal from the other party's facsimile 7+7 is adjusted, and when the connection control signal is received from the other party's facsimile, transmission of the pseudo flag signal is canceled and at the same time, the facsimile is sent in synchronization with the pseudo flag signal. This is a facsimile signal relay method that relays remote connection control signals. [Operation] In the former means corresponding to claim 1, a terminal such as a facsimile receives a header signal ψ such as a preamble.
When it receives this preamble, it turns off the timer and waits for the signal that is received following this preamble. Therefore, an adapter such as the present invention can be connected to a terminal without 1l1fi.
When a command signal from the terminal is detected, it sends a preamble to the terminal, waits for a response signal from the destination terminal, receives the response signal, and sends the response signal after the preamble to the originating terminal. By doing so, the negative effects of upstream transmission delay can be prevented. In the latter means corresponding to claim 2, voice codec insertion/removal control, GI [IF
Equipped with a buffer memory for AX connection control signals and image signals, a signal speed conversion circuit, a GmFAX modem and a pseudo flag signal generation circuit, and a FAX to digital wireless communication line.
A signal connection control field was provided, and when the wireless base station and mobile station received a connection control signal from the general telephone network or the mobile station's GIII FAX, it relayed it to the digital wireless line and sent out the connection control signal. After sending a pseudo flag signal (FLG signal) to the GI [IFAX, and using the function that temporarily stops the operation of the connection control timer when receiving the FLG signal that the FAX has, the connection control of the GI [IFAX is performed. This suppresses the operation of the management timer and ensures normal operation of connection control. According to the present means, in a mobile communication system or a mobile satellite communication system using a digital radio line with a low transmission rate, a general-purpose GI [FAX] is installed in a mobile station, and a connection control procedure or connection control timer is set. It is possible to connect to Gl [FAX] of the general telephone network without changing the timer value.

〔Example〕

Figure tII&1 is a structural diagram of an adapter according to an embodiment of the present invention (this embodiment corresponds to the invention of claim 1). In the figure, AP is an adapter, 1 is a terminal, 2 is a connection Yasuko, 3 is a command signal detection section, 4 is a control section, 5 is a time monitoring section, 6 is a preamble generation section, 7 is a response signal detection section, 8 represents a radio device. Terminal 1 is identical to terminal 14 in the United States. When installed in a mobile device, wireless FI8 is a mobile device, and when installed in a base station system, there is no wireless FI8! fi8 is a base station wireless device, and terminal 1
is a terminal connected to the end of the telephone network. A suitable example of a terminal is a facsimile, but a captain, a data terminal,
It can also be applied to various types of eel slaughter on a computer. However, since the details of the control procedure differ depending on the terminal, it will naturally be modified accordingly. In the following, an embodiment of the present invention will be explained using a facsimile as an example. The command signal sent from Kishu 1 is sent to command signal detection WS3.
is input to the control unit 4. The command signal input to the control 84 is transmitted as is without #ilfi8 to the destination terminal. The command signal detection unit 3 detects the contents of the command signal and notifies the control WS 4 of the contents of the command.
In response to this, the control section 4 triggers the time monitoring section 5. The time monitoring unit 5 issues a preamble request at a timing shorter than the time leap of the timeout of the slaughter 1. In response to this, the control section 4 triggers the preamble generation section 6 and transmits the preamble from there to the terminal 1. When the response signal detection section 7 detects a response signal from the destination terminal, it notifies the control section 4 of this fact. The control unit 4 thereby stops the 7-pin pull and sends a response signal to the terminal 1. An embodiment corresponding to the invention of M'FC term 2 will be described below. FIG. 4 is a diagram showing an example of method #I for implementing the invention of claim 2, in which (a) shows the configuration of the wireless base MJ system, and (b)
> indicates the configuration of the wireless line, (e) indicates the configuration of the mobile station, 31 is a wireless base station, 32-1 to 32-n are mobile stations, 33 is a switching center, and 34 is a general telephone network. telephone, 35-1
~35-n is the GmFAXwi end of the general telephone network, 361i
1iJ official M#l line, 37 is communication digital s#a
line group, 38 is a general telephone network connecting the radio base station 31 and exchange 33, 39 is the exchange 33, telephone 8!34 and GI [
[Subscriber telephone line connecting the FAX 35, 53 is the control unit, 54
indicates an antenna duplexer, and 55 indicates an antenna. In the figure, the mobile station transmits and receives 1'l! 40, wireless line switch 41, telephone interface 42, non-telephone interface 7
Ace 43, control unit 44, telephone 45, GmF for mobile station
When AX terminals 46-1-4610 and antenna 47 are used to set up a communication wireless line by making a call from a mobile station, for example, when the mobile station 32-1 hooks telephone 45 to O7 and makes a dial call, the wireless The line switch 41 relays the network information to the control unit 44. The control WS 44 generates a calling signal with a mobile station ID number added, and transmits the signal from the transmitter/receiver fIIi 40 to the control wireless line 36,
j! via the control radio line transmission/reception 1f148! Ili
transmission to the line base station 31. In the wireless base station 31, the control unit 53 selects an empty communication digital wireless line from the communication digital wireless line group 37 and uses it as the control fi#1 line 36.
This notifies the mobile station, and also activates the corresponding transmitter of the specified communication digital wireless line transmitter/receiver 49-1 to 49-n. The mobile station 32-1 switches the transceiver 40 to the specified communication digital radio line and transmits radio waves to the radio base station. When the wireless base station completes the setting of the specified digital wireless line for communication, it connects any one of the telephone ink 7aces 51-1 to 51-n that includes the corresponding audio codec,
Switching center 33 and wireless base station 3 via wireless line switch 50
1-leaf general telephone network 38 and switching office 33 and general telephone network 3
Connect the phone number 9 @ 34 and complete the communication line settings. If the GIII FAX terminal on the general telephone network is in automatic mode,
Detects RGT and switches from telephone mode to FAX mode. On the other hand, in the mobile station, after confirming that the setting of the digital wireless line for communication is completed, when the FAX communication button is turned on, the FAX mode is detected by the wireless line switch 41, and the FAX is The interface is selected, the audio codec is disconnected, and the control unit 53 of the radio base station 31 and the corresponding Fax to Telephone Ink 7 Ace Department
Notify mode communication. The frame structure in Figure 2 is the same from the wireless base station to the mobile station (7-year-old word line) and from the mobile station to the wireless base station (return line). The control unit 53 of the radio base station has a non-telephone interface 7A-X52-.
Select FAX Ink 7 Ace from 1-52-n, disconnect the audio codec of the telephone interface 51, and connect the FA
Connect X ink 7 ace and return line C
The ONT notifies the mobile station of the wireless base station response, and then the FA
The 7-yield for X connection control (FAX CONT) and the 7-yield for image signal (PIX) relay the FAX connection control signal and the image signal.

In the case of a telephone call, the voice signal is relayed using PIX7 Yield. FIG. 6 is an example of relaying a G[[FAX connection control signal according to the present invention, in the case of a mobile station receiving a FAX while transmitting a FAX on a general telephone network. The wireless base station and mobile station enter FAX mode, and the mobile station receives a CED signal (21
00Hz tone signal) followed by the FLG signal and DI
S signal is sent to Send 1111FAX. At the mobile station, the minimum necessary FLG signal and DIS signal are relayed to the S-line base station in the FAX connection control field, and at the same time the mobile station's FA waits for a DOS signal from the general telephone network FAX.
Send a pseudo FLG signal to control the standby time. At the radio base station, an FLG signal of the required length is added to the D
Relays IS signal to FAX on general telephone network and transmits gAFA
DOS signal from X with 7 yield for FAX connection control,
Next, the 4800b/,sTCF signal (Training signal) is relayed to the receiving FAX on the mobile side with a signal yield of 7, and is sent to the FAX on the sending side of the general telephone network in the same way as the mobile station. The FLG signal is transmitted at a modulation rate of 300 b/s, and the operation of the CFR signal standby timer from the receiving MFAX on the mobile station side is suppressed. On the other hand, when the mobile station receives the DOSM signal from the transmitter@FAX, it cuts off the pseudo-FLG signal and relays the received FLG signal and DOS signal to the receiver@FAX in succession to the pseudo-FLG signal.
In addition, the TCF signal is faxed at a modulation speed of 4800 b/s.
Relay to. Next, at the mobile station, the CFR signal (if
Relays the signal indicating signal reception to the wireless base station and sends a pseudo FL to the receiving side FAX
G{i! r number and suppresses the operation of the image signal standby timer. When the radio base station receives a CFR signal from a mobile station, it cuts off the pseudo FLG signal and also sends off the pseudo FLG signal.
The cFR signal is 300b/1i1L on the FLGffi number.
The fax is relayed to the sending 1111 FAX on the general telephone network at a modulation rate of s. When the transmitting side FAX confirms the CFR signal from the receiving IFAX, it starts transmitting the image signal - The mobile station transmits lll! When it confirms that the IiIM signal is received from the FAX, it cuts off the suspected fiFLG signal and shifts to image signal relay mode. As described above, the W& line base station and mobile station are equipped with a pseudo FLG signal generation function, and the GI [IF
An example of a method for relaying AX connection control signals was shown. [Effects of the Invention] As described in detail above, the present invention has the following effects.

In other words, according to the Agbuta according to the invention of requirement item 1, even if the transmission delay of the non-IIIA system is large, the terminal can communicate normally without timeout. Further, according to the method according to the invention of claim 2, when the transmission path is a narrowband digital radio line and relay processing of non-telephone 1g such as GI [IFAX signal etc. In mobile communication wireless lines where there is a problem with the transmission path, G [[
A pseudo FLG signal generation function equivalent to the FLG signal included in the FAX connection control signal is used to generate a pseudo FLG signal from the radio base station and mobile station to the FAX that is waiting for the FAX connection control signal
By transmitting the LG signal, detecting the FLGg signal possessed by the GmFAX, and using the function of suppressing the connection control timer operation, there is an advantage that connection can be made without changing the functions of the G[[FAX]. ．．

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the configuration of an adapter according to an embodiment of the present invention, Fig. 2 is a block diagram showing an example of a mobile communication system, and Fig. 3 is an example of a mobile communication system provided with an adapter for non-telephone communication. 4 is a block diagram showing an example of a system structure for carrying out the invention of claim 2, and FIG. 5 is a block diagram showing a frame structure from a radio base station to a mobile station or from a mobile station to a radio base station in a digital radio line. FIG. 6 is a diagram showing an example of relaying the Gl[FAX signal when there is a delay in the transmission path. 1... Data terminal, 2...
・Data terminal connection terminal, 3...Command signal detection section, 4...Control section, 5.
...Time monitoring section, 6 ...Preamble generation section, 7 ...Response signal detection section,
8... Radio, AP...
...7gbuta, 31 ...wireless base station,
32-1 to 32-n...mobile station,
33 ...exchange, 34 ・
...Telephones on the general telephone network, 35-1 to 35
1n ・・・・・・1xpm G■7 Ax (G
I[IFAX), 36... Control wireless line, 37... Digital wireless line group for communication, 38... General telephone network, 39...
・・・・Subscriber telephone line, 40 ・・・・・・
Transmitter/receiver, 41... Wireless line switch for mobile station, 42... Telephone ink for mobile station 721, 4
3...Non-telephone interface, 44...
...control unit, 45 ...telephone,
46-1 to 46-n...Mobile station GI [[7
Ax (G[lFAX), 47...
... Antenna, 48 ... Control radio line transceiver, 49-1 to 49-n ・
....Digital wireless line transceiver for communication line, 50 ....Line switching device for wireless base station, 51-1
~51-n...j! FiAi base station telephone interface, 52-1 to 52-n...
...Non-telephone interface for wireless base station 7ace, 53...
...Radio base station control unit, 54...
・Wireless base station antenna duplexer, 55...
·antenna

Claims (1)

[Claims] 1. An adapter disposed between a terminal and a wireless device,
It consists of a command signal detection unit from the origination terminal, a response signal detection unit from the destination terminal via the radio, a time monitoring unit, and a preamble generation unit, and the command signal detection unit detects the command signal from the origination terminal. After detection, the preamble is transmitted from the preamble generation unit to the originating terminal, and the preamble being transmitted is stopped by detecting a response signal from the destination terminal via the radio by the response signal detection unit. 1. An adapter for non-telephone communication in mobile communication, characterized in that the response signal is transmitted to a calling terminal. 2. In a mobile communication system in which the radio line is configured with a digital radio line using a high-efficiency voice codec, a pseudo flag signal identical to the flag signal included in the frame structure of the facsimile connection control signal is generated at the radio base station and mobile station. When a wireless base station or mobile station receives a connection control signal from a facsimile, it relays the control signal to the digital wireless line by controlling the insertion and removal of the audio codec, and also transmits the connection control signal. By sending back a pseudo flag signal to the facsimile, the operation of the facsimile's connection control timer is temporarily suppressed, the waiting time for the connection control signal from the other facsimile is adjusted, and the pseudo flag signal is sent back to the facsimile when the connection control signal is received from the other facsimile. A facsimile signal relay method characterized in that a connection control signal is relayed to the facsimile in synchronization with a pseudo flag signal at the same time as transmission of a flag signal is canceled.