JPS61184017A - End detection system of multi-frequency common use communication system - Google Patents

Abstract

PURPOSE:To quicken the end detection of a service channel by providing an end of call supervisory timer having a prescribed function. CONSTITUTION:When non-talking state continues over the 1st time to the 2nd time set optionally, a non-talking detection section 43 of an end of call supervisory timer 44 discriminates an end of call and outputs an end of call signal. Then the non-talking detection section 43 detects the presence of talking and sends the result of detection to the timer 44. The timer 44 applies a prescribed end of call supervision and informs the result to a control section 45 by using an end of call signal. The control section 45 turns off a connection switch 42 and a transmission section 46 to stop the transmission. Thus, the end detection of the service channel is quickened.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an end detection method when allocating a service channel in a multi-frequency shared communication system in which a plurality of wireless channels are shared by a plurality of terminal stations.

(Prior Art) Conventionally, this type of termination detection has been performed by configuring the carrier wave te from the terminal station so that no subtone exists for a certain period of time immediately after service channel assignment.

(Problem to be solved by the invention) Therefore, if the termination determination time becomes long, the non-call time increases unnecessarily and usage efficiency decreases, which is a drawback.On the other hand, if the termination determination time becomes short, service channels are not allocated. It also had the disadvantage that it was difficult to respond immediately.

An object of the present invention is to eliminate the above-mentioned drawbacks by starting the termination monitoring operation with a delay or by increasing the termination determination time at first and decreasing it later, thereby providing highly efficient and high-speed multi-frequency shared communication. The object of the present invention is to provide a system termination detection method.

(Means for Solving the Problems) The termination detection method of the multi-frequency shared communication system according to the present invention consists of a plurality of terminal stations and a relay control station for controlling the plurality of terminal stations, and includes a control channel and a plurality of terminal stations. A termination detection method for a system that uses a multi-frequency signal consisting of a communication channel and communicates through a communication channel specified by a control channel, wherein the relay control station has at least a no-call detection unit, an end-of-call monitoring timer, and a communication channel specified by a control channel. , and a control section.

The no-call detection section is for detecting a no-call state based on the presence or absence of carrier waves or subtones from a plurality of terminal stations.

The end-of-call monitoring timer determines that the call is over when the no-call state continues for a first period of time, which can be set arbitrarily, by the no-call detector, and sends a end-of-call signal. It is for outputting .

The control unit is a ninth unit that controls the transmission of the specified communication channel to be stopped by the above-mentioned call-end signal when the call-end monitoring timer determines that the call has ended.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 shows the present invention in a multi-channel access system (
FIG. 2 is a system configuration diagram showing an example of application to MOA.

In FIG. 1, a plurality of terminal stations 21 , 211 , 21
2.22, 221, 222 are coupled to a central control station by control channels 1001, 1002, respectively. Now, when the terminal station 21 transmits a calling signal via the control channel 1001, the relay control station l transmits a channel designation signal to group A including the terminal station 21 via the same channel.

As a result, the terminal stations 21 , 211 , and 212 shift to the communication channel 101 so that they can communicate with each other via the relay control station 1 .

Next, the operation shown in FIG. 1 will be explained according to an example of the timing chart shown in FIG. When the terminal station 21 transmits a calling signal (phase ■), the central control station l receives the signal (phase ■), transmits a channel designation signal (phase ■), and performs a relay connection operation of the call channel (7 ■).At the same time, terminal stations 21, 211, 2
12 receives the channel designation signal (phase ■) and switches to the communication channel. At this time, terminal station 21゜211
, 212 is informed by voice or display that a call is possible.

On the other hand, the relay control station l performs relay connection operation (7 Aze■)
At the same time as the start of the wireless terminal station 21. The machine starts a no-call state detection operation (7 Aze ■) based on the presence or absence of the carrier wave or subtone from 211. Further, if the no-call state continues for more than 72 hours, which can be arbitrarily set, after a delay of T1 time, the end-of-call monitoring operation (phase 2) is started to determine that the call is over. At this time, the terminal station 21
Even if you send a call after an hour delay (phase ■), tt (T
If it is i, tt) Even if it is T2, the call does not end.

When the no-call state time (phase ■) reaches ts>T2 after the start of the end-of-call monitoring operation (phase ■), it is determined that the call is over, and the relay control station 1 performs a relay connection operation by sending out an end-of-call signal. to stop transmitting the call channel. Terminal station 2
1, 211, and 212 may detect the transmission disconnection of the communication channel of the relay control station I and return to the control channel.

Figure 3 is an example of a time chart similar to Figure 2, but instead of transmitting the start of end-of-call monitoring,
For the first certain period of time, the value of the end-of-call monitoring timer is T 1 (
By setting T I>T2 ), the same function as in FIG. 2 is obtained.

FIG. 4 is a block diagram of hardware that implements the call end detection method of the relay control station 1. In FIG. 4, 41 is a receiving section, 42 is a connection switch, 43 is a no-call detection section, 4
4 is a call end monitoring timer, 45 is a control unit, 46 is a transmitter, 4
7 is a receiving antenna, and 48 is a transmitting antenna.

In FIG. 4, the signal from the terminal station 21 is applied to the receiving section 41, the speech signal is simultaneously fed to the connection switch 42, and the carrier wave input information from the terminal station 21 or the superimposed subtone signal sent out is The signal is supplied to the no-call detection section 43. The no-call detector 43 detects the presence or absence of a call, and sends the detection result to the end-of-call monitoring timer 44 . The end-of-call monitoring timer 44 performs the end-of-call monitoring operation, which is clear from the explanation in FIGS. 2 and 3, and notifies the control section 45 of the result by means of a end-of-call signal. As a result, the control section 45 turns off the connection switch 42 and the transmission section 46, and ends the relay connection operation.

(Effects of the Invention) As explained above, the present invention starts the termination monitoring operation with a delay, or initially increases the termination determination time.
By reducing the size later, it is possible to speed up the detection of the end of a service channel in a multi-frequency shared communication system without imposing any burden on the operator.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram showing an embodiment of a multi-channel access system based on the present invention. FIGS. 2 and 3 are examples of timing charts showing the operation of the system shown in FIG. 1. FIG. 4 is a block diagram showing an embodiment of hardware that implements the end detection method according to the present invention. l... Relay control station 11... Control device 12-.
- Wireless device 13-...Relay antenna 21.22.
211,212.221,222...terminal station 101.
102,1001.1002...Channel 41...
Receiving unit 42...Connection switch 43...No call detection unit 44...Call end monitoring timer 45...Control unit 46...Transmitting unit 47, 48...Antenna

Claims (1)

[Claims] It consists of a plurality of terminal stations and a relay control station for controlling the plurality of terminal stations, and uses a multi-frequency signal consisting of a control channel and a plurality of communication channels, and uses a multi-frequency signal consisting of a control channel and a plurality of communication channels to control the communication channel specified by the control channel. A termination detection method for a system in which communication is performed through one terminal station, wherein the relay control station detects a no-call state based on the presence or absence of carrier waves or subtones from at least the plurality of terminal stations; The no-call detector determines that the call is over when the no-call state continues for a second time period that can be set arbitrarily after the no-call state continues for a first time, and sends a call-end signal. End-of-call monitoring timer for output,
and a control unit configured to control the transmission of the specified communication channel to be stopped by the end of call signal when the end of the call is determined by the end of call monitoring timer. An end detection method featuring: