JPH077487A - Station monitoring system - Google Patents

Abstract

PURPOSE:To shorten fault detecting period of a repeating station and a slave station in a time-divided multiplex communication system. CONSTITUTION:A call processing control circuit 90 executes originating/ terminating call control processing, a talking station detecting circuit 100 detects a repeating station and a slave station in talking, a control signal switching circuit 110 outputs a switching signal for using a call processing control signal transmitting use time slot for a station monitoring signal by switching it from use of a call processing signal which is not required in talking as use of a station monitoring signal based upon an output signal from the circuit 100. The 1st selector circuit 10 selects a station monitoring signal outputted from a station monitor and control circuit 80 and the station monitoring signal is time-divided and multiplexed with the call processing control signal transmitting use time slot. On the receiving side, the signal of a call processing control signal transmitting use time slot signal separated by a control signal separating circuit 60 is a response signal to a monitor signal and is outputted to the 2nd selector circuit 70 and then outputted to the circuit 80.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a station monitoring system, and more particularly to a system for monitoring relay stations and slave stations of a time division multi-directional multiplex communication system.

[0002]

2. Description of the Related Art Conventionally, as this type of station monitoring system, for example, there is a system disclosed in Japanese Patent Laid-Open No. 63-136848. This system is composed of one master station, multiple relay stations and slave stations, the master station communicates with each relay station and slave stations using multiple wireless channels, and the relay station is each subordinate relay station. It is also applied to a time division multi-directional multiplex communication system that communicates with a slave station using a plurality of wireless channels and is used for monitoring a relay station and a slave station. Then, the master station periodically polls each relay station and slave station using the downlink monitoring channel, and each relay station and slave station checks its own status only when its own station is polled. It was sending back to the master station using the upstream monitoring channel.

[0003]

According to this conventional station monitoring method, all relay stations and slave stations are periodically polled sequentially using a monitoring channel, so that the relay stations and slave stations are polled. If the number of stations is large, the polling cycle per station becomes long, and the problem detection cycle becomes long.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a station monitoring system which can shorten the polling period for relay stations and slave stations without increasing the time slots in the radio signal frame format.

[0005]

A station monitoring system according to the present invention comprises one master station, a plurality of relay stations and slave stations, and the master station uses each relay station and slave stations and a plurality of wireless channels. In the master station of the time division multi-directional multiplex communication system in which the relay station communicates with each of the subordinate relay stations and slave stations by using a plurality of wireless channels, either the station monitoring control circuit or the call processing control circuit And a first selection circuit for selecting the output signal of the control signal switching circuit according to the output signal of the control signal switching circuit, and a time slot for transmitting the call processing control signal of the transmission signal to the relay station or the slave station. A control signal multiplexing circuit for time division multiplexing, and a supervisory signal multiplexing circuit for time division multiplexing the output signal of the station supervisory control circuit into a time slot for station supervisory signal transmission of a transmission signal to a relay station or a slave station, Each relay station A transmission / reception circuit that transmits / receives a radio signal to / from a slave station, and a supervisory signal separation circuit that separates a signal of a station supervisory signal transmission time slot from a reception signal received by the transmission / reception circuit from a relay station or a slave station, A control signal separation circuit that separates the signal of the call processing control signal transmission time slot from the received signal, and whether the output signal of the control signal separation circuit is output to the station monitoring control circuit or the call processing control circuit And a second selection circuit for selecting an output signal of the control signal switching circuit, wherein the station monitoring control circuit outputs an output signal of the busy station detection circuit,
A station supervisory signal is output to either the first selection circuit or the supervisory signal multiplexing circuit, and the response signal is input from the supervisory signal separation circuit and the second selection circuit to each relay station and slave station. And the call processing control circuit inputs the call processing control signal from the second selection circuit and outputs the call processing control signal to the first selection circuit and the talking station detecting circuit to communicate with the talking station. The detection circuit detects a relay station and a slave station in a call by an input signal from the call processing control circuit, outputs the result to the station monitoring control circuit and the control signal switching circuit, and the control signal switching circuit is The selection signal is output to the first selection circuit and the second selection circuit according to the output signal of the in-call station detection circuit.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a master station showing an embodiment of the present invention. In FIG. 1, the first selection circuit 10 selects an output signal of either the station monitoring control circuit 80 or the call processing control circuit 90 according to the output signal of the control signal switching circuit 110. The control signal multiplexing circuit 20 time-division-multiplexes the output signal of the first selection circuit 10 into a time slot for call processing control signal transmission of a transmission signal to a relay station or a slave station. The supervisory signal multiplexing circuit 30 time-division-multiplexes the output signal of the station supervisory control circuit 80 with the time slot for station supervisory signal transmission of the transmission signal to the relay station or the slave station. The transceiver circuit 40 is
Radio signals are transmitted and received between each relay station and each slave station.

The supervisory signal separation circuit 50 is a transmission / reception circuit 40.
The signal of the time slot for transmitting the station supervisory signal is separated from the received signal from the relay station or the slave station received in (1). The control signal separation circuit 60 separates the signal of the call processing control signal transmission time slot from the received signal from the relay station or the slave station. The second selection circuit 70 outputs the output signal of the control signal separation circuit 60 to the station monitoring control circuit 80 or the call processing control circuit 9
The output signal of the control signal switching circuit 110 selects which of 0 is output. The station supervisory control circuit 80 outputs the station supervisory signal to either the first selection circuit 10 or the supervisory signal multiplex circuit 30 according to the output signal of the busy station detector circuit 100, and outputs the response signal thereof to the supervisory signal separation circuit. Fifty
And from the second selection circuit 70 to monitor and control each relay station and slave station.

The call processing control circuit 90 outputs a call processing control signal to the first selection circuit 10 and the busy station detection circuit 100. The talking station detection circuit 100 includes a call processing control circuit 90.
The relay station and the slave station in the call are detected by the input signal from the terminal and the result is output to the station monitoring control circuit 80 and the control signal switching circuit 110. The control signal switching circuit 110 uses the output signal of the busy station detection circuit 100 to output the first selection circuit 1
A selection signal is output to 0 and the second selection circuit 70.

Next, the operation will be described. FIG. 2 shows a wireless signal frame format between the master station and each relay station and slave station, and FIG. 2B is an enlarged view of a part of FIG. First, for the relay station and the slave station that are not in a call, the call processing control signal output from the call processing control circuit 90 is selected in the first selection circuit 10, and the call processing is performed when the call processing occurs. The control signal is output to the control signal multiplexing circuit 20. In the control signal multiplexing circuit 20, the output signal of the first selection circuit 10 is for the call processing control signal transmission of FIG. 2 (B) of the data transmission time slots TS1, TS2 ,. It is time-division multiplexed in the time slot S1. Further, the station supervisory signal output from the station supervisory control circuit 80 is time-division multiplexed by the supervisory signal multiplexing circuit 30 into the station supervisory signal transmission time slot TS0 of FIG.

The transmission / reception circuit 40 transmits a signal in which the call processing control signal and the station supervisory signal are multiplexed to each relay station and the slave station, and conversely, the call processing control signal and the station supervisory signal from each relay station and the slave station. Receives the multiplexed signal. The monitoring signal separation circuit 50 uses the signals received by the transmission / reception circuit 40 as shown in FIG.
The signal of the station monitoring signal transmission time slot TS0 of (A), that is, the response signal to the station monitoring signal is separated and output to the station monitoring control circuit 80. The control signal separation circuit 60 separates the signal of the call processing control signal transmission time slot S1 in FIG. 2B, that is, the call processing control signal from the signal received by the transmission / reception circuit 40, and the separated signal is sent to the second selection circuit 70. Output. The second selection circuit 70 outputs a call processing control signal to the call processing control circuit 90, and the call processing control circuit 90 performs incoming / outgoing call control processing.

On the other hand, the call processing control circuit 90 performs the incoming and outgoing call control processing, and the in-call station detection circuit 100 detects that the relay station and the slave station in the call are in a call.
The output signal causes the control signal switching circuit 110 to output the signal shown in FIG.
The time slot S1 for call processing control signal transmission of (B) is
It outputs a switching signal for use from a call processing control signal that is not required during a call to a station supervisory signal. That is,
In the first selection circuit 10, the station supervisory signal output from the station supervisory signal control circuit 80 is selected, and the station supervisory signal is time-division multiplexed in the call processing control signal transmission time slot S1 of FIG. 2B. To be done. Also on the receiving side, the signal of the time slot S1 for call processing control signal transmission of FIG. 2B separated by the control signal separation circuit 60 is a response signal of the supervisory signal and is transmitted to the second selection circuit 70. It is output to the rear station monitoring control circuit 80.

[0012]

As described above, the station monitoring system according to the present invention provides the call processing control signal transmission time in the unnecessary data transmission time slot to the relay station and the slave station during a call. By monitoring stations using slots, and performing periodic polling using time slots for transmitting station monitoring signals only to relay stations and slave stations that are not in communication, the time in the wireless signal frame format is The polling cycle for the relay station and the slave station can be shortened without increasing the slots, and the failure detection of the relay station and the slave station can be performed in a short time.

[Brief description of drawings]

FIG. 1 is a block diagram of a master station showing an embodiment of a station monitoring system according to the present invention.

FIG. 2 is a diagram showing a radio signal frame format (FIG. A) between a master station, each relay station, and a slave station and a part of it enlarged (FIG. B).

[Explanation of symbols]

 10 first selection circuit 20 control signal multiplexing circuit 30 supervisory signal multiplexing circuit 40 transmission / reception circuit 50 supervisory signal separation circuit 60 control signal separation circuit 70 second selection circuit 80 station supervisory control circuit 90 call processing control circuit 100 busy Station detection circuit 110 Control signal switching circuit

Claims (2)

[Claims] 1. A master station comprises a master station, a plurality of relay stations and slave stations, the master station communicates with the relay stations and slave stations using a plurality of wireless channels, and the relay station is a subordinate relay station. In the master station of a time division multi-directional multiplex communication system that communicates with a station and a slave station using a plurality of wireless channels, the output signal of the control signal switching circuit is the output signal of either the station monitoring control circuit or the call processing control circuit. A first selection circuit for selecting the output signal from the first selection circuit, and a control signal multiplexing circuit for time division multiplexing the output signal of the first selection circuit into a time slot for transmitting a call processing control signal of a transmission signal to a relay station or a slave station, A supervisory signal multiplexing circuit that time-division-multiplexes the output signal of the station supervisory control circuit in a time slot for station supervisory signal transmission of a transmission signal to a relay station or a slave station, and a radio signal between each relay station and slave station Send and receive times Channel, a supervisory signal separation circuit for separating a signal of a station supervisory signal transmission time slot from a reception signal from the relay station or a slave station received by the transmission / reception circuit, and a time slot for call processing control signal transmission from the reception signal Of the control signal separation circuit for separating the control signal and the output signal of the control signal separation circuit is selected by the output signal of the control signal switching circuit to the station monitoring control circuit or the call processing control circuit. The station monitoring control circuit outputs a station monitoring signal to either the first selecting circuit or the monitoring signal multiplexing circuit according to the output signal of the busy station detecting circuit. The response signal is input from the supervisory signal separation circuit and the second selection circuit to monitor and control each relay station and slave station, and the call processing control circuit sends the call processing control signal to the second The input from the selection circuit and the output to the first selection circuit and the in-call station detection circuit. The in-call station detection circuit receives the input signal from the call processing control circuit, and the relay station and the slave station in the call. Is detected, and the result is output to the station monitoring control circuit and the control signal switching circuit, and the control signal switching circuit uses the output signal of the in-call station detection circuit to output the first selection circuit and the second selection circuit. A station monitoring system characterized by outputting a selection signal to a selection circuit. 2. The station monitoring method according to claim 1, wherein the first selection circuit outputs the call processing control signal output from the call processing control circuit to a relay station and a slave station that are not in a call. Is selected, and the station monitoring signal output from the station monitoring signal control circuit is selected for the relay station and the slave station during a call.