JPS6032372B2 - Mobile communication method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mobile communication system in which line connections can be controlled.

In conventional mobile communication systems, in order to handle call processing for many subscribers, in addition to the telephone lines used for telephone calls, a control circuit is provided to control line connections.

To make a call, the radio control station first receives a calling signal from the mobile subscriber via the control line, and based on this, instructs the mobile subscriber which call line number to use. Telephone lines allow mobile subscribers to make telephone calls. However, this call is only possible if there are still available call lines left, and it goes without saying that if all the call lines are busy, it is impossible to make a call. Therefore, although there is an independent line called a control line, it cannot be used, and it cannot be said to be fully satisfactory from the point of view of effective use of frequencies. Therefore, it is an object of the present invention to provide a mobile communication system that makes it possible to effectively use limited wireless lines by using the control line left behind when all call lines are used as a call line. That is. According to the present invention, in a mobile communication system that includes a plurality of lines and a line control unit having at least a calling channel control function, and connects the lines by providing a dedicated control line separate from the call channel, A switch is provided that is connected to one fixed line among the plurality of lines and controlled by the line control unit, and normally the switch is in a saddle state and the fixed line connected to the switch is used as a control circuit. In addition, if another line is used as a call line for a call between a mobile subscriber and a fixed subscriber, and a new call occurs while all the call lines used for the call are busy, the above-mentioned The fixed line, which had been used as a control line, is turned off by turning off the switch in the saddle state, and the fixed line, which had been used as a control line, is used as a telephone line, and after all the lines are in a communication state, any one of the lines is switched off. When the call ends,
When this line is the fixed line, it is used as a control line, and when it is any other line, the call on the fixed line is transferred to any other line where the call has ended, thus making it free. A mobile communication system is obtained that is characterized in that the fixed line in the state is used as a control line.

Next, a detailed explanation will be given with reference to the drawings.

FIG. 1 is a diagram showing an example of the configuration of a conventional mobile communication system.

In the radio control station 31 surrounded by the broken line in FIG. 1, the line CHOI is a fixed radio device TRXO I equipped with an antenna
, an independent line comprising an approach line (also used by the line number CHOI), and a control line 32 equipped with a calling channel control device consisting of an incoming call channel control device, a calling signal receiver, and a line designation transmitter. is forming. The line CHI I has a fixed radio TRXI I and an approach line (CHII) and is the first call line connected to the fixed subscriber LII. Line CH21 is also a similar second call line. For example, mobile subscriber M
When the SII attempts to make a call, it sends a calling signal to the radio control station 31 via the control line CHOI, and the radio control station 3
1 notifies the mobile subscriber MSI I of the number of a free telephone line (CHII in this case) to be used on the control line CHOI. In response to this command, the mobile subscriber MSII can make a call by moving from the control line CHO1 to the speech line CHII. In the above, if the calling subscriber MSII makes a call, the communication circuits CHII and CH
Needless to say, if all 21 were busy, the above call would not be possible.

However, as mentioned above, since the control line CHOI is provided independently, if this line can be used, the frequency will be used more effectively. FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention. In the radio control station 51 surrounded by a broken line, line CH03 is fixedly used as a control line, and lines CHI3 and CH23 are
is provided for calls between mobile subscriber MS13 and land subscriber L13, and calls between mobile subscriber M Toge and land subscriber L23. In this case, the switch control circuit 52 connects the switches SW14 and SW18 of the matrix switch circuit 53 and the line C used as a control line.
A switch SWI9 provided between H03 and the calling channel control device 54 is connected, and the others are disconnected. When the mobile subscriber MS03 and the land subscriber L03 want to make a call in such a state, the mobile subscriber MS03 uses the line CH03 as the call line through the calling channel control device 54.
Let me know. The switch control circuit 52 then switches S
Disconnect WI9 and connect SWI0. On the other hand, the mobile subscriber starts using the line CH03 as a telephone line according to the instructions, and can make a telephone conversation with the land subscriber L03. Next, in such a state, for example, land subscriber L23 and mobile subscriber S
Assuming that the period W23 has ended, the switch control circuit 52
switches 10 and 18 are turned off, switch 19 is turned off, and the calling channel controller 54 is connected to the mobile subscriber MS03.
The line frequency is instructed to be transferred from the circuit CH03 to the line CH23.

Then, when the line frequency changes, the switch control circuit 52 sets the switch SW12 to the normal state, and thereby the mobile subscriber MS03
and land subscriber L03 resumes the call through line CH23. Thereafter, line control is performed again through line CH03. FIG. 3 is a block diagram showing the configuration of a radio equipment provided by a mobile subscriber, and the operation when a line (frequency) designation is instructed will be explained using this block diagram.

The line designation signal input from the antenna 60 is sent to the receiver 6
1, the data enters the control unit 63 via the data receiver 62. The control section decodes the signal and specifies the line frequency to the frequency synthesizer 64. Thus, the receiving frequency and the transmitting frequency become the line frequency specified by the control station. Then, the data from the data generator 65 is modulated by the transmitter 66 and sent out from the antenna 60 through the duplexer 67. Furthermore, 68
is the handset.

[Brief explanation of drawings]

Figure 1 is a diagram showing an example of the configuration of a conventional mobile communication system.
FIG. 2 is a diagram showing the configuration of an embodiment of the present invention, and FIG. 3 is a block diagram showing the configuration of a mobile subscriber's radio equipment. Explanation of symbols: 51 represents a radio control station, 52 a switch controller, 53 a matrix switch, and 54 a calling channel control device. CH'ma line, now land subscriber, MS is mobile subscriber, S
Each W represents a switch. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In a mobile communication system that is equipped with a plurality of lines and a line control unit having at least a calling channel control function, and in which line connections are made by providing a dedicated control line separate from the call channel, A switch is provided that is connected to one of the fixed lines and controlled by the line control unit, and normally the switch is turned on and the fixed line connected to the switch is used as a control line. If a line is used as a telephone line for a telephone call between a mobile subscriber and a fixed subscriber, and a new call occurs while all the telephone lines used for the telephone call are busy, The switch in the current state is disconnected and the fixed line that was previously used as a control line is used as a voice line for voice calls, and after all lines are in the voice line, any one of the lines can be used for voice calls. When the call is terminated, if this line is the fixed line, it is used as the control line, and if it is any other line, the call on the fixed line is transferred to one of the other lines where the call ended. Move to line,
A mobile communication system characterized by using the fixed line that is now free as a control line.