JPS58202641A - Master station device of time division multi-direction multiplex communication system - Google Patents

Abstract

PURPOSE:To detect a circuit fault of a master station, by multiplexing in time division a monitor signal and applying to a transmitting signal within a master station having a time division multi-direction multiplex communication system which transmits the signal to a master station from a slave station with a single frequency, then branching the multiplexed signal to the receiving side of the master station to monitor the monitoring signal. CONSTITUTION:For a master station device, a signal (b) supplied from a circuit 11 which generates a signal for monitor of own station device is multiplexed to a signal (a) which is transmitted to a slave station through a time division multiplexing circuit 12. The output (c) of the circuit 12 receives the signal processing such as scrambling, etc. through a circuit 13. The signal output (d) is modulated by a modulating circuit 14 and converted into an IF signal (e) which is transmitted to the slave station. A part of the signal (e) is branched, and only the modulated signal (f) of the monitoring signal (b) is extracted through a gate 15 and gransmitted to the master station from each slave station through the next circuit 16 to be multiplexed with time division with a signal (g) of a single frequency which received a frequency conversion into the signal (e). This multiplexed signal is demodulated by a demodulating circuit 17 and receives the signal processing through a signal processing circuit 18. Then signals (g) and (b) are reproduced, and a signal (j) is delivered. The signal (b) is monitored by a monitoring circuit 19 to detect the fault of circuits 12-18 of the master station device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a master station device in a time division multiplex communication system.

The time-division multidirectional multiplex communication system to which the present invention is applied will be explained in detail later using drawings, but the master station device that is the object of the invention transmits time-division signals that are multiplexed signals to each slave station in multiple directions. Each slave station regenerates the timing signal from the signal sent from the master station and extracts the signal on its own side. Communication in which a signal is transmitted on a single frequency common to each slave station for the time allotted to each slave station with a delay of . It is a system. The communication system disclosed in Japanese Patent Application No. 53-68581 (Japanese Unexamined Patent Publication No. 54-158810) is an example of this. In conventional multi-directional communication systems commonly used, signals sent from a slave station to a master station use different frequencies for each slave station.

Now, in this type of multi-directional multiplex communication system, as in the multi-directional communication system mentioned above, a failure in the master station causes a failure in the entire system.

Increasing the reliability of the master station equipment has become an important issue.

One way to solve this problem is to use a master station device.
It may be a preliminary configuration. If this method is adopted, as in the multi-directional communication system described above,
It goes without saying that this objective can be achieved by attaching independent fault detection mechanisms to the transmitting and receiving sides of the master station device, and switching to the standby device when either of the fault detection mechanisms detects a fault. However, it is difficult to provide at least two systems of failure detection mechanisms like this.

Unfavorable in terms of structure and price.

Therefore, an object of the present invention is to provide a master station in a time division multi-directional multiplex communication system in which signals from the slave station to the master station are transmitted using a single frequency, and to eliminate interference within the master station. 5. This is an attempt to obtain a master station device with a simple detection mechanism.

According to the present invention, a supervisory signal generation circuit, which is a master station in a time division multidirectional multiplex communication system constituted by one master station and a plurality of slave stations, generates a supervisory signal for monitoring its own station; a first time division multiplexing circuit for time division multiplexing the generated supervisory signal into a transmission signal from the master station to the slave station; a modulation circuit for outputting, a gate circuit for extracting the monitoring signal from the outputted IF multiplied signal, and a signal sent from each slave station to the master station, converted into an IF multiplied signal, and extracted by the dirt circuit. a second time division multiplex circuit that time division multiplexes the IFF visual signals; and a demodulation circuit that demodulates the output signal of the second time division multiplex circuit.

A master station device for a time-division multidirectional multiplex communication system is obtained, which includes a monitoring circuit that monitors the reproduced monitoring signal multiplexed with the output signal of the demodulation circuit.

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

FIG. 1 is a diagram showing an example of an outline of a time division multidirectional multiplex communication system to which the present invention, which was briefly explained earlier, is applied. In this communication system, the master station continuously transmits time-division signals in multiple directions to each slave station, and each slave station synchronizes with the signal sent from the master station. By reproducing the timing signal, the signal assigned to the own station is extracted, and each slave station gives an appropriate delay to the signal to be sent to the master station based on the timing signal, and sends the signal to each slave station. Sends signals for the allocated time SFA, SFB,...5FN (subframes) on a single frequency common to each slave station.

Signals A and B sent from each slave station at the master station.

...N is controlled so that it is arranged in order on the time axis like the signal S in the figure. Note that the above subframe SFA etc.
In some cases, two or more locations are allocated within a frame.

FIG. 2 is a block diagram showing the configuration of an embodiment of the master station device according to the present invention in the time division multiplex communication system of FIG. 1. In FIG. 2, 11 is a supervisory signal generation circuit that generates a signal for monitoring its own station, and 12 is a supervisory signal generator output from the supervisory signal generation circuit 11 as signal a sent from the master station to the slave station. time division multiplexing circuit that performs time division multiplexing;
13 is a multiplexed signal C output from the time division multiplexing circuit 12
A signal processing circuit that performs signal processing such as scrambling.

(5) 14 is a modulation circuit that modulates the output signal d of the signal processing circuit 13 and outputs an IF signal sound to be sent to the slave station.

Reference numeral 15 denotes a dart circuit which branches part of the IF multiplied signal and outputs the branched signal; 16 denotes an IF supervisor monitoring signal sound extracted by the dart circuit 15 for monitoring the own station;

This is a time division multiplexing circuit that time division multiplexes a single frequency signal g sent from each slave station to the master station and subjected to IF multiplied signal frequency conversion.

The IFF power signal of the time division multiplexing circuit 16 is demodulated in the demodulation circuit 17, and the demodulated signal i is subjected to signal processing in the signal processing circuit 18 that is opposite to that performed in the signal processing circuit 13 described above. Re.

The signal g sent from each slave station to the master station and the monitoring signal for self-monitoring are regenerated and output as an output signal j, and the monitoring signal is time-division multiplexed with the signal j in the monitoring circuit 19. By monitoring.

The presence or absence of a failure in the circuits (12 to 18 in FIG. 2) of the master station device is monitored.

(6) FIG. 3 is a diagram showing the structure of the signals of each part in FIG. 2 with the horizontal axis as the time axis, and a, b, ... on the left side of FIG. ... are raining as they are. 5FA-8FN in the figure are the subframes mentioned in FIG. Time slots F k * TDj and T for multiplexing
D2 indicates the delay time.

As is clear from the above explanation, if a failure occurs in the master station device, regardless of whether it is on the transmitting side or the receiving side, the supervisory signal TEST multiplexed in signal j will be abnormal. This is detected by the monitoring circuit 19 as a device failure. Therefore, the current master station device can be immediately switched to the backup device.

Moreover, in this case, only one set of failure detection mechanism is required in the master station device, which simplifies the mechanism of the entire device.

11:

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of a time division multiplex communication system to which the present invention is applied, FIG. 2 is a block diagram showing an example of a master station device according to the present invention, and FIG. FIG. 3 is a diagram showing the configuration of signals in the user section. Explanation of symbols: 11 is a monitoring signal generation circuit, 12 is a time division multiplex circuit, 13 is a signal processing circuit, 14 is a modulation circuit, 15 is a dart circuit, 16 is a time division multiplex circuit, 17 is a demodulation circuit,
18 is a signal processing circuit, and 19 is a monitoring circuit.

Claims (1)

[Claims] 1. A master station in a time-division multidirectional multiplex communication system composed of one master station and a plurality of slave stations, which includes a supervisory signal generation circuit that generates a supervisory signal for monitoring its own station; a first time division multiplexing circuit that time division multiplexes a supervisory signal into a transmission signal from the master station to the slave station; and a modulator that modulates the time division multiplexed transmission signal of the supervisory signal and outputs an IF multiplied signal. circuit, a dart circuit for extracting the monitoring signal from the outputted IF multiplied signal, and a dart circuit for extracting υ from the output multiplied IF signal into the signal sent from each slave station to the master station and converted into the IF multiplied signal. a second time division multiplexing circuit for time division multiplexing the IF monitoring signal, a demodulation circuit for demodulating the output signal of the second time division multiplexing circuit, and a demodulation circuit for demodulating the output signal of the second time division multiplexing circuit; A master station device for a time division multidirectional multiplex communication system, including a monitoring circuit that monitors a reproduced monitoring signal.