JPH01282929A - Radio communication system - Google Patents

Abstract

PURPOSE:To reduce the traffic of a communication line and to attain effective utilization of a radio wave by dividing a communication line into a voice communication line and a data communication line so as to use them and designating a channel externally by a radio equipment. CONSTITUTION:A base station 2 and a control station 1, and the control station 1 and mobile stations 3-5 are connected by a voice communication line 13 and a data communication line 14. The base station 2 and the mobile stations 3-5 are provided with a radio communication equipment 12 with a channel designating function. The radio communication equipment 12 is set to a designated channel by using a channel shift signal sent through data terminal equipments 10, 11 and a radio line.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a wireless communication system in which a wireless communication device capable of data transmission is used as a slave station.

[Conventional technology]

FIG. 7 is a system diagram of a conventional wireless communication system. In the figure, l is a control station that performs wireless relay and control of the system, 2 is a base station that issues instructions to each mobile station, and 3 to 5 are base stations 2 The mobile stations A to C16 that move according to the instructions are data transmission terminals connected to the radios installed in each of the mobile stations A3 to C5, and 7 is a data transmission terminal connected to the radio installed in the base station 2. Connected data transmission terminal 8 is a wireless communication device capable of switching multiple channels and has a data transmission function; 9 connects base station 2 and control station 1, and control station 1 and mobile stations 3 to 5; It is a wireless line. Next, the operation will be explained. Figure 8 (C) from base station 2
As shown in FIG. 2, when a voice call and data transmission is to be made to the mobile station A3, the base station 2 calls the mobile station A3 and makes a voice call. Thereafter, an 8th
Confirm that data transmission is performed as shown in Figure (a),
Perform data transmission. Furthermore, the mobile station C5 uses the CH of the base station 2 shown in FIG. 8(b).
2, and data transmission is performed as shown in FIG. 8(C). During this time, all lines of the mobile station B4 are blocked as shown in FIG. 8Cd), and the mobile station B4 cannot make a call. Once mobile station A3 ends the call, mobile station B4 starts the call, so mobile station A3 communicates with mobile station B4 and mobile station C5.
Because the mobile station is using the communication line for voice calls or data transmission, the call cannot be made unless one of the mobile stations ends the call.

[Problem to be solved by the invention]

Since the conventional wireless communication system is configured as described above, voice calls and data transmission are performed on the same channel, and as the time for data transmission becomes longer, the time for voice calls becomes shorter. In addition, there were problems such as the need for a person to check the line status, resulting in unnecessary calls. This invention was made to solve the above-mentioned problems, and aims to provide a wireless communication system that reduces communication line traffic and enables effective use of radio waves.

[Means to solve the problem]

The wireless communication system according to the present invention has a voice communication line and a data communication line as independent communication lines, and a base station and each mobile station are provided with a wireless communication device with a channel designation function.

[For use]

The wireless communication device in this invention is set to a designated channel by a channel change signal sent through an externally connected data terminal and a wireless line.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a control station that performs wireless relay and control of the system, 2 is a base station that issues instructions to each mobile station A3 to C5, and each mobile station A3 to C5 moves according to instructions from base station 2. 10 is a wireless communication device 12 with a channel specification function (hereinafter referred to as
11 is a base station installed in the base station 2 and has a function of transmitting a channel change signal to the mobile stations A3 to C5; data transmission terminal (hereinafter referred to as data terminal). This is a radio device that can change channels through each of the above-mentioned radio devices 12 and a wireless line. 13 is the base station 2 and the control station 1, and the control station 1 and the mobile stations A3 to C
A voice communication line 14 connects the base station 2 and the control station 1, and a data communication line connects the control station 1 and the mobile stations A3 to C5. FIG. 3 is a block diagram showing the detailed configuration of the radio device 12. In the figure, 15 is an antenna for the radio device;
17 is a radio section capable of switching transmission and reception frequencies; 17 is an audio amplification section that amplifies the received signal, causes the speaker 21 to sound, and also amplifies the input signal from the microphone 22, and sends it to the radio section 16; 18 is a radio circuit section; Line state detection unit for detecting the state, 1
9 is a modem unit that converts a digital signal into an analog signal and an analog signal into a digital signal; 20 is a radio device 1;
2 is a control unit that controls the entire system; 23 is a transmission data input that inputs transmission data sent from the data terminal; 24 is a reception data output that sends reception data from the radio 12 to the data terminal; 25 is specified by the data terminal. 26 is a busy signal output that notifies the data terminal of the status of the wireless device 12, and 27 is an external press that requests transmission from the data terminal to the wireless device 12. It's a signal. Next, the operation will be explained. First, a case will be described in which data is transmitted from the base station 2 to the mobile station A3. FIG. 4 is an explanatory diagram showing a protocol when transmitting data from the base station 2 to the mobile stations A3 to C5. When transmitting data from base station 2 to mobile station A3, the second
As shown in Figures (a) and 2(C), the mobile station A3 normally monitors the voice communication line 13, and the channel of the mobile station A3 is shown in Figure 2(b) from the voice communication line 13. In order to switch to the data communication line 14 as shown in FIG. 4, the data terminal 11 of the base station 2 sends a CH change signal to the mobile station A3 in step STI. The mobile station A3 that received the CH change signal switches the channel to the data communication line 14, detects the state of the data communication line 14 by the line state detection unit 18 inside the radio 12, and transmits the signal from the busy signal output 26 to the data communication line 14. At the same time, the received signal demodulated into a digital signal by the modem section 9 is outputted to the data terminal 11 from the received data output 24 as a CH shift confirmation signal in step ST2. The data terminal 11 that received this CH shift confirmation signal detects the signal output from the busy signal output 26, confirms that the data communication line 14 is free, and sends a CH shift confirmation signal to the base station 2. Send out. The base station 2 that has received the CH transition confirmation signal performs step ST.
3, data is sent to mobile station A3. Figure 2 (C)
), after the mobile station A3 finishes receiving the data, it sends a data reception confirmation signal to the base station 2 (step 5T4). The sending conditions are the same as for the CH shift confirmation signal. Upon receiving the data reception confirmation signal, the base station 2 returns the channel of the mobile station A3 from the data communication line 14 to the voice communication line 13 as shown in FIG. 2(a) in step ST.
At step 5, a CH shift signal is sent to mobile station A3. After switching the channel to the voice communication line 13, the mobile station A3 checks the status of the voice communication line 13, and transmits the C to the base station 2.
An H transition confirmation signal is sent (step 5T6). Next, the case where data is sent from the mobile station A3 to the base station 2 will be explained. FIG. 5 shows a protocol when transmitting data from mobile station A3 to base station 2. The data terminal 11 switches the radio 12 of the mobile station A3 to the data communication line 14, and checks whether the line is in use at this time. If the line is in use, the data terminal 11 outputs a channel designation signal to the radio 12, and the voice communication line 1
After a certain period of time, the data communication line 14 is switched again using a channel designation signal, and the line status is checked. At this time, if the line is free, it outputs a data transmission request signal to the base station 2 in step 5TII and waits for a data transmission permission signal from the base station 2. At this time, if a data transmission permission signal is not received from the base station 2 after a certain period of time, a data transmission request signal is sent to the base station 2 again. When the data transmission permission signal is returned from the base station 2 in step 5T12, after all the data to be transmitted to the base station 2 has been transmitted in step 5T13,
Waiting for data reception confirmation signal from base station 2, data reception 1
If no +il acknowledgment signal is received, the data is sent again. If the data reception confirmation signal is received in step 5T14, the data terminal 11 of the mobile station A3 determines that the data transmission has been completed, and sends a channel designation signal to the radio device 12 of the base station 2 to select the channel of the radio device 12. Switch to communication line 13. Although the above embodiment has been described with respect to the mobile station A3, other mobile stations B4. The same operation is performed for C5. Further, in the above embodiment, a wireless communication system using the control station 1 is shown, but the present invention may also be applied to a two-way wireless system that does not use the control station 1, as shown in FIG. Further, the radio unit 16 shown in FIG. 3 can be configured not only in the simplex method but also in the two-wave simplex method or the duplex method, with the same configuration and the same effect. Further, even if a retransmission function is added to various confirmation signals and data, and an error correction code or the like is added to the data, the same effect as in the above embodiment can be obtained.

【Effect of the invention】

As described above, according to the present invention, the communication line is divided into a voice communication line and a data communication line, and the wireless device is configured so that the channel can be specified from the outside. Since the base station side can treat the data communication line and the voice communication line as dedicated lines, the device can be made inexpensive and the configuration can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing the configuration of a wireless communication system according to an embodiment of the present invention, Fig. 2 is a timing chart showing call timing in the above embodiment, and Fig. 3 shows the configuration of a radio device in the above embodiment. A block diagram, FIG. 4 is an explanatory diagram showing a protocol when transmitting data from a base station to a mobile station in the above embodiment, and FIG. 5 is a protocol when transmitting data from a mobile station to a base station in the above embodiment. FIG. 6 is a system diagram showing the configuration of a wireless communication system according to another embodiment of the present invention, FIG. 7 is a system diagram showing the configuration of a conventional wireless communication system, and FIG. 8 is a system diagram showing the configuration of a conventional wireless communication system. 3 is a timing chart showing call timing of the communication system. 2 is a base station, 3 is a mobile station A, 4 is a mobile station B, 5 is a mobile station C110 is a data transmission terminal for a mobile station, 11 is a data transmission terminal for a base station, 12 is a wireless communication device with a channel specification function, 13 is a voice communication line, and 14 is a data communication line. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation Figure 1 2:1-Se station 10:P! Tatami force station data 4 self-transmission] Shimamoto 311 substation A 11: base station tota 4 Yunshiba Hatosue 4: Senshi station B 12
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Claims (1)

[Claims] A wireless communication device with a channel specification function that can transfer channels from a voice communication line to a data communication line and vice versa, and a data transmission for a mobile station that has a function to specify a channel for this wireless communication device with a channel specification function. a plurality of mobile stations having a terminal, a wireless communication device with a channel designation function similar to the plurality of mobile stations, and a base station data transmission terminal having a function of transmitting a channel change signal to each of the mobile stations; A wireless communication system comprising: a base station having a base station;