JPH08256192A - Radio interface circuit - Google Patents

Abstract

PURPOSE: To surely perform switching to the MODEM setting mode indicating MODEM setting of a base station during data communication even in the case of many data errors of a radio line. CONSTITUTION: When a special data string is detected by a data string detection circuit 4 after a prescribed no-signal duration from a data communication terminal is detected by a time measuring circuit 3, the start of MODEM setting indication to the MODEM function or the base station is discriminated. Then, a MODEM function setting start instruction is transmitted to the base station through the radio line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is connected to a data communication terminal such as a computer via a connection line, and wirelessly receives data received from the data communication terminal via the connection line to a base station having a modem function. The present invention relates to a wireless interface circuit for transmitting via a line, and in particular, a wireless interface circuit capable of reliably shifting from a data communication to a modem setting mode for instructing a modem setting of a base station even when there are many data errors in the wireless line. Regarding

[0002]

2. Description of the Related Art Conventionally, when performing data communication between data communication terminals such as computers via a telephone network or the like, as shown in FIG. 4, a modem 11 is connected to a computer 10 via a wired connection line 10a. However, the computer 10 is configured to perform data communication with a data communication terminal such as another computer (not shown) via the telephone network 15 via the modem 11.

By the way, in recent years, portable radio telephones using radio have become widespread, and digital radio telephones for communicating a radio communication section using the portable radio telephones with digital signals have been standardized.

FIG. 5 shows a configuration in which data communication is carried out between data communication terminals such as computers via the telephone network 15 by using this portable radio telephone or the like. In FIG. A terminal 12 such as a portable wireless telephone is connected to a computer 10, and a base station 13 connected to a telephone network 15 is provided on the other hand, and the terminal 12 and the base station 13 are wirelessly connected by a digital signal. ing.

When data communication is performed between data communication terminals such as computers using this terminal 12 such as a portable radio telephone, the data from the computer 10 which is a data communication terminal is regarded as voice and the data is transmitted between the terminal 12 and the base station 13. There is a method of transmitting data between the two, but in this case, there is a conventional ITU-T recommendation V. When an error control method such as 42 is used, there is a problem in that the data transmission efficiency deteriorates due to the superposition of errors in the wireless section between the terminal 12 and the base station 13.

In addition, a new error control method has been proposed in consideration of the use of radio in the communication in the wireless section between the terminal 12 and the base station 13, but when this new error control method is adopted, , ITU-T Recommendation V. Communication using an error control method such as 42 cannot be performed.

Further, a method of performing error control for wireless communication in consideration of an error in the wireless section between the terminal 12 and the base station 13 has been considered, but when there are many errors in the wireless section, It is essential that a delay occurs in data transmission in the wireless section between the terminal 12 and the base station 13.

By the way, data which is used by the computer 10 which is a data communication terminal to perform data communication with another computer which is a data communication terminal through the telephone network 15 using the terminal 12 such as a portable radio telephone and the base station 13. When performing modem settings such as whether or not to perform error control for the modem of the base station 13 during communication, it is assumed that there are few errors on the telephone network 15 from the past history of data communication, for example. Then, the computer 10 sets up the modem of the base station 13 in a mode that does not perform error control, and starts data communication.

However, when an error is detected in a higher-level application when data communication is actually performed, the modem setting of the base station 13 is changed from the computer 10 to switch to an error control method for error control. There may be cases in which it is unavoidable.

In this case, it is general to employ a method of transmitting a special command including a time condition as shown in FIG. 6 from the computer 10.

That is, in FIG. 6, when the computer 10, which is a data communication terminal, changes the modem setting of the base station 13 during data communication, the computer 10 temporarily interrupts the data communication and sets a certain signalless time. After
When a special data sequence is transmitted and a non-signal time of a certain time continues after this special data sequence, the data following the non-signal time is used by the base station 13 to change the modem setting of the base station 13. To determine.

However, when adopting the method of transmitting a special command including such a time condition, when there are many errors in the wireless section between the terminal 12 such as a portable wireless telephone and the base station 13, There is a problem that the base station 13 cannot surely determine that the data is data for changing the modem setting of the base station 13, and cannot reliably guarantee the change of the modem setting.

[0013]

As described above, a computer which is a data communication terminal through a telephone network by wirelessly connecting a base station connected to the telephone network using a terminal such as a portable radio telephone. When performing data communication between
When changing the modem setting of the base station during data communication,
Conventionally, a method of transmitting a special command including a time condition has been adopted. Here, if there are many errors in the wireless section between a terminal such as a mobile wireless telephone and the base station, the base station There is a problem in that it cannot be surely determined that the data is data for changing the modem setting of the station, and thus it is not possible to guarantee the reliable change of the modem setting.

Therefore, an object of the present invention is to provide a wireless interface circuit which can surely shift from a data communication to a modem setting mode for instructing a modem setting of a base station even when there are many data errors in the wireless line. And

[0015]

To achieve the above object, the present invention provides a modem function for connecting data to a data communication terminal via a connection line and receiving data from the data communication terminal via the connection line. In a wireless interface circuit for transmitting to a base station via a wireless line, time measuring means for measuring a continuous no-signal time during data reception from the data communication terminal via the connecting line, and the connecting line. Data string detecting means for detecting a special data string from the received data from the data communication terminal via
When the data sequence detecting unit detects the special data sequence after detecting the predetermined no-signal continuous period by the time measuring unit, it is determined that the modem setting instruction to the modem function of the base station is started. And a modem function setting start command transmitting means for transmitting a modem function setting start command to the base station via the wireless line.

[0016]

In the wireless interface circuit of the present invention, when the data sequence detecting unit detects the special data sequence after detecting the predetermined no-signal continuous period by the time measuring unit, the modem setting instruction for the modem function of the base station is given. When it is determined that the start has been started, a modem function setting start command is transmitted to the base station via the wireless line.

With such a configuration, even when there are many data errors in the wireless line, it is possible to reliably shift from the data communication to the modem setting mode for instructing the modem setting of the base station.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a wireless interface circuit according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a wireless interface circuit according to the present invention. This wireless interface circuit corresponds to the terminal 10 shown in FIG. 5, and although not shown in FIG.
It is connected to the computer 10 which is the data communication terminal shown in FIG. 5 and also to the base station 13 having a modem function which is connected to the telephone network 15.

In FIG. 1, a radio interface circuit includes a main control unit 1 for controlling the entire radio interface circuit using a microcomputer, a radio control unit 2 for performing wireless data communication with a base station, and a data communication terminal. It is provided with a time measuring section 3 for measuring a signalless time from a computer during data communication of a computer, and a data string detection circuit 4 for detecting a special data string pattern from the computer which is a data communication terminal.

FIG. 2 is a flow chart showing the operation of the main controller 1 shown in FIG. 1. The operation of the radio interface circuit shown in FIG. 1 will be described below with reference to the flow chart shown in FIG.

First, before a computer (not shown), which is a data communication terminal, performs data communication, the computer makes a call to a base station (not shown) via this wireless interface circuit. After that, a computer, which is usually a data communication terminal, issues a modem setting instruction to set the modem of the base station.

That is, the main controller 1 of the wireless interface circuit shown in FIG. 1 first confirms whether or not it is a modem setting instruction from a computer which is a data communication terminal (step 101). Next, it is checked whether or not it is an end instruction indicating the end of the data communication from this computer (step 102).

If it is determined in step 101 that the instruction is not the modem setting instruction from the computer, step 1
Move to 04.

If it is determined in step 102 that the termination instruction does not indicate termination of data communication, the base station is notified of modem setting (step 103), and step 1
Move to 04.

In step 104, it is checked whether or not the instruction from the computer which is the data communication terminal means to start data communication (step 104). If it does not mean to start data communication, step 101 is carried out.
Return to and wait for the modem setting instruction from the computer.

When it is determined in step 104 that the data communication is started, data communication processing is performed (step 105).

In step 106, it is judged whether or not the modem setting is restarted during the data communication. If it is determined that the modem setting has not been restarted, the process returns to step 105 to continue the data communication.

When it is judged in step 106 that the modem setting is restarted, a modem function setting start command is sent to the base station to instruct the start of modem function setting (step 107).
Then, the process returns to step 101 and waits for a modem setting instruction from the computer.

FIG. 3 is a flow chart showing an example of the processing for judging whether or not the modem setting is restarted in step 106 shown in FIG.

In FIG. 3, first, it is determined whether or not there is no signal for a certain period of time (step 201). Where YE
If S, the process proceeds to step 202, and if NO, the process returns NO as this process.

In step 202, it is judged whether or not it is a special data string. If NO, the process returns as NO. If YES, the process proceeds to step 203 and the same process as step 201, that is, it is determined whether or not there is no signal for a certain period of time.

If YES is determined in step 203, it means that the special instruction as shown in FIG. 6 is detected, and YE
Return as S. That is, it is determined that the modem setting is restarted, and the process proceeds from step 106 to step 107 in FIG. If NO in step 203, the process returns NO from this process.

According to this structure, even when there are many data errors in the radio line with the base station, it is possible to reliably shift from the data communication to the modem setting mode for instructing the modem setting of the base station. .

[0035]

As described above, according to the present invention,
When the data sequence detecting unit detects the special data sequence after detecting the predetermined no-signal continuous period by the time measuring unit, it is determined that the modem setting instruction for the modem function of the base station is started, and the modem function setting is performed. Since the start command is configured to be sent to the base station via the wireless line, even if there are many data errors in the wireless line with the base station, the modem setting mode is instructed to instruct the base station modem setting during data communication. It will be possible to make a sure transition.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a wireless interface circuit according to the present invention.

FIG. 2 is a flowchart showing the operation of the main control unit shown in FIG.

FIG. 3 is a flowchart showing an example of processing for determining whether or not the modem setting restart shown in FIG. 2 is performed.

FIG. 4 is a block diagram showing a conventional configuration when data communication is performed between computers, which are data communication terminals, via a telephone network.

FIG. 5 is a block diagram showing a configuration when data communication is performed between computers, which are data communication terminals, via a telephone network using a mobile wireless telephone or the like.

FIG. 6 is a diagram showing an example of a special instruction including a time condition used when changing a modem setting of a base station from a computer which is a data communication terminal.

[Explanation of symbols]

 1 Main Control Section 2 Wireless Control Circuit 3 Time Measurement Circuit 4 Data Sequence Detection Circuit 10 Computer (Data Communication Terminal) 11 Modem 12 Terminal (Mobile Radio Phone) 13 Base Station 15 Telephone Network

Claims (2)

[Claims] 1. A radio connected to a data communication terminal via a connection line and transmitting data received from the data communication terminal via the connection line to a base station having a modem function via a wireless line. In the interface circuit, time measuring means for measuring a continuous no-signal time during data reception from the data communication terminal via the connection line, and special data from received data from the data communication terminal via the connection line A data string detecting means for detecting a string; and, when the special data string is detected by the data string detecting means after detecting a predetermined no-signal continuous period by the time measuring means, a modem for the modem function of the base station. When it is determined that the setting instruction is started, a modem function setting start command for transmitting a modem function setting start command to the base station via the wireless line is issued. A wireless interface circuit comprising: an instruction transmitting means. 2. The modem function setting start command transmitting means, on condition that the time measuring means detects a predetermined no-signal continuous period after the detection of the special data string by the data string detecting means is completed. 2. The wireless interface circuit according to claim 1, wherein the modem function setting start command is transmitted to the base station via the wireless line.