JPH0715403A - Station monitor system - Google Patents

Abstract

PURPOSE:To decrease the fault detection time of a relay station and a slave station in a time division multiplex communication system. CONSTITUTION:A monitor signal generating circuit 50 of a relay station reads periodically and sequentially an ID of the relay station and the slave station in existence in a subordinate position of a concerned station from a subordinate station ID table 40 to generate a monitor signal, and a monitor signal multiplexing circuit 60 multiplexes the signal onto a transmission signal to provide a transmission signal. The result of station monitor returned in a form of the monitor signal while being multiplexed on a monitor signal transmission time slot from a subordinate relay station and the slave station is demultiplexed by a monitor signal demultiplexer circuit 80 and stored in a monitor result table 100. A present station monitor circuit 90 monitors periodically an alarm from present station and stores the result to the monitor result table 100. When an ID included in a signal of the monitor signal transmission time slot received from a host station and demultiplexed by a monitor signal demultiplexer circuit 20 is detected by a present station ID detection circuit 30 and the signal is a monitor signal to the present station, the station monitor result stored in the monitor result table 100 is subjected to time division multiplexing onto a transmission signal to a subordinate station by a monitor signal multiplexer circuit 110.

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 monitoring system for relay stations and slave stations of a time division multi-directional multiplex communication system.

[0002]

2. Description of the Related Art Conventionally, this type of station monitoring system is, for example,
As described in Japanese Patent Laid-Open No. 63-136848, it is composed of one master station and a plurality of relay stations and slave stations. The master station uses each relay station and slave stations and a plurality of wireless channels. The relay station is used for monitoring the relay station and the slave stations in a time division multi-directional multiplex communication system in which the communication is performed and the relay station communicates with each of the lower relay stations and the slave stations using a plurality of wireless channels. For example, 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]

In this conventional station monitoring method, all relay stations and slave stations are periodically polled sequentially by using a monitoring channel.
If the number of relay stations and slave stations increases, the polling cycle per station becomes longer, and the problem detection time becomes longer.

An object of the present invention is to provide a station monitoring system that solves such a problem.

[0005]

The station monitoring system of the present invention comprises:
It consists of one master station, multiple relay stations and slave stations,
The master station communicates with each relay station and slave station using a plurality of wireless channels, and the relay station communicates with each lower relay station and slave station using a plurality of wireless channels. In the relay station, the first transmission / reception circuit for transmitting / receiving radio signals to / from the upper station and the signal in the time slot for transmitting the supervisory signal are separated from the signal received from the higher station in the first transmission / reception circuit. A first supervisory signal separation circuit, a self station ID detection circuit that detects an ID included in the supervisory signal separated by the supervisory signal separation circuit, and receives only a supervisory signal for the self station, and a subordinate station to the self station Subordinate station I that stores the IDs of all relay stations and slave stations
A D table, a supervisory signal generation circuit that periodically produces a supervisory signal to the relay station and the slave station to which the IDs stored in the lower station ID table are assigned, and the supervisory signal generation circuit A first supervisory signal multiplexing circuit for time-division-multiplexing a supervisory signal with a transmission signal to a lower station, a second transceiver circuit for transmitting and receiving a radio signal to and from the lower station, and the second transceiver A second supervisory signal separation circuit that separates the signal of the supervisory signal transmission time slot from the signal received from the lower station in the circuit, a self-station supervisory circuit that periodically monitors the self-station for alarm, and the second A monitoring result table in which the monitoring signal separated by the monitoring signal separation circuit and the monitoring result detected by the own station monitoring circuit are stored,
A second supervisory signal multiplexing circuit that time-division multiplexes the station supervisory results stored in the supervisory result table with the transmission signal to the upper station only when the supervisory signal is received by the own station ID detection circuit; , Are provided.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of a relay station showing an embodiment of the present invention.

In FIG. 1, a transmission / reception circuit 10 transmits / receives radio signals to / from an upper station.

The supervisory signal separation circuit 20 is a transmission / reception circuit 10.
At, the signal of the time slot for transmitting the supervisory signal is separated from the signal received from the upper station.

The local station ID detection circuit 30 detects the ID contained in the supervisory signal separated by the supervisory signal separation circuit 20,
It receives only the monitoring signal for its own station.

The lower station ID table 40 stores the IDs of all relay stations and slave stations that are subordinate to the own station.

The supervisory signal generation circuit 50 periodically and sequentially produces supervisory signals for the relay stations and slave stations to which the IDs stored in the lower station ID table 40 are assigned.

The supervisory signal multiplexing circuit 60 time-division multiplexes the supervisory signal output from the supervisory signal generation circuit 50 into a transmission signal to the lower station.

The transmission / reception circuit 70 transmits / receives a radio signal to / from a lower station.

The supervisory signal separation circuit 80 is a transmission / reception circuit 70.
At, the signal in the time slot for transmitting the supervisory signal is separated from the signal received from the lower station.

The local station monitoring circuit 90 periodically monitors the local station for alarms.

In the monitor result table 100, the monitor signals separated by the monitor signal separation circuit 80 and the own station monitor circuit 9 are displayed.
The monitoring result detected at 0 is stored.

The supervisory signal multiplexing circuit 110 time-division multiplexes the station supervisory results stored in the supervisory result table 100 with the transmission signal to the upper station only when the self station ID detection circuit 30 receives the supervisory signal. Turn into.

Next, the operation of this embodiment will be described.
The supervisory signal generation circuit 50 of the relay station uses the lower station ID table 40 to identify the IDs of relay stations and slave stations that are lower than the own station.
Are periodically read in sequence to generate monitoring signals for the lower relay station and slave stations. This supervisory signal is time-division multiplexed by the supervisory signal multiplexing circuit 60 into a transmission signal to the lower station, and is transmitted by the transmitting / receiving circuit 70. With respect to this supervisory signal, the results of station supervision are returned from lower relay stations and slave stations in a time-division multiplexed time slot for supervisory signal transmission. The station monitoring result signal is received by the transmission / reception circuit 70, separated by the monitoring signal separation circuit 80, and then stored in the monitoring result table 100. Further, the own station monitoring circuit 90 periodically monitors the own station for alarms and stores the result in the monitoring result table 100.

The transmitting / receiving circuit 10 receives a signal from the host station, and the own-station ID detecting circuit 30 detects the ID contained in the signal of the supervisory signal transmitting time slot separated by the supervisory signal separating circuit 20. As a result, when the received signal is the supervisory signal for the own station, the supervisory signal multiplexing circuit 110 time-division-multiplexes the station supervisory result stored in the supervisory result table 100 with the transmission signal to the higher station.

[0021]

As described above, the station monitoring system according to the present invention is provided with means for storing the IDs of the relay stations and the slave stations which are subordinate to the relay station, and periodically sends to those stations. By transmitting the monitor signal and storing the result in the monitor result table, the number of stations to which the master station transmits the monitor signal is reduced, the polling cycle per station is shortened, and the relay station and Fault detection of a slave station can be performed in a short time.

[Brief description of drawings]

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

[Explanation of symbols]

 10 transmitter / receiver circuit 20 supervisory signal separation circuit 30 own station ID detection circuit 40 lower station ID table 50 supervisory signal generation circuit 60 supervisory signal multiplexing circuit 70 transceiver circuit 80 supervisory signal separator circuit 90 own station supervisory circuit 100 supervisory result table 110 supervisory signal Multiplexing 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 a relay station of a time division multiplex multiplex communication system that communicates with a station and a slave station using a plurality of wireless channels, means for storing the IDs of the relay station and the slave station that are subordinate to the relay station is provided, and A station monitoring method characterized by periodically transmitting a monitoring signal to a station and storing the result in a monitoring result table. 2. 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. A relay station of a time division multiplex multiplex communication system that communicates with a station and a slave station using a plurality of radio channels; a first transceiver circuit that transmits and receives a radio signal to and from a higher station; A first supervisory signal separating circuit for separating a signal of a supervisory signal transmitting time slot from a signal received from a higher-order station in a transmitting / receiving circuit, and detecting an ID contained in the supervisory signal separated in the supervisory signal separating circuit, A local station ID detection circuit that receives only a monitoring signal for the local station, a lower station ID table that stores the IDs of all relay stations and slave stations that are subordinate to the local station, and the lower station ID table stores the lower station ID table. Has been A supervisory signal generation circuit for periodically and sequentially producing supervisory signals for relay stations and slave stations to which IDs are assigned, and a supervisory signal output from the supervisory signal generation circuit is time-division multiplexed with a transmission signal to a lower station. A first supervisory signal multiplexing circuit that converts the signals, a second transceiver circuit that transmits and receives radio signals to and from a lower station, and a supervisory signal transmission from the signal received from the lower station by the second transceiver circuit. A second supervisory signal separation circuit that separates time slot signals, a self-station supervisory circuit that periodically monitors an alarm of the self station, and a supervisory signal separated by the second supervisory signal separation circuit and the self The monitoring result table in which the monitoring result detected by the station monitoring circuit is stored, and the station monitoring result stored in the monitoring result table is stored in the upper order only when the monitoring signal is received in the own station ID detection circuit. Transmission to station And a second supervisory signal multiplexing circuit for time-division-multiplexing the signal, and a station supervisory method.