JPS5834634A - Service channel transmitting system in time division multi-way multiplex communication system - Google Patents

Abstract

PURPOSE:To perform transmission of service signals (signals for maintenance etc.) between any optional stations without exerting influences on transmission of main signals by adding time slot of the first and second channels comon in each station. CONSTITUTION:In case where a master station transmits time division multiplex signals and each slave station regenerates a timing signal and sends out signals to the master station only during a time SFA, SFB,... SFn allotted to each slave station, CH1 and CH2 are provided as channels common to slave stations. A slave station (b) (a slave station that uses the common channel first) transmit to the master station through CH2, and the master station transmits the signal received through CH2 to each slave station through CH1. A slave station (c) replying to the signal of CH1 transmits to the master station through CH1. The master station transmits the signal received through CH1 to each station through CH2. The slave station (b) can communicate with optional slave station by monitoring CH2. CH2 is used for communication between the master station and slave station (b) and CH1 is used between the master station and slave station (c).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a time division multiplex communication system consisting of one master station and a plurality of slave stations, in which signals for maintenance of the system can be sent to any two stations.

This type of conventional time division multidirectional multiplex communication system.

As seen in the configuration example of FIG. 1, a master station sends multiplexed time-division signals to each slave station in multiple directions. Each slave station synchronizes with the signal sent from the master station and regenerates the timing signal to extract its own signal. In addition, each slave station uses the above timing signal as a reference, and when assigned in advance to each slave station, fa'l S
FA, 5FB (+..., SFN only sends out signals, and the master station receives signals A, B, etc. sent from each station.
..., N are controlled so that they are arranged in order on the time axis.

Note that F in Figure 1 represents one frame, and +5FA- represents the time of a subframe allocated to each slave station within one frame.

Furthermore, depending on the system, two or more slave stations may be assigned within the subframe.

In communication systems such as those described above, methods of temporarily using time slots for main signal transmission and methods of providing dedicated time slots for each slave station have been adopted as methods for transmitting maintenance signals. . However, the former has a great effect on the transmission of the main signal in a slave station to which a small number of channels are allocated (with a short subframe time length).

The latter has a high transmission speed for voice, etc. as maintenance signals,
Therefore, if many time slots are required in one frame, not only will the signal transmission speed in the wireless section greatly increase and the radio frequency transmission band will be expanded, but also the voice signal for maintenance that is infrequently used will be required. It is necessary to provide a unique time slot for each slave station in order to transmit the radio waves, etc., which has the disadvantage that the efficiency of radio wave use is greatly reduced.

An object of the present invention is to eliminate the above-mentioned drawbacks, and to provide a one-time division multidirectional multiplex communication system without affecting the transmission of the main signal, and between a master station and a slave station as well as between arbitrary slave stations. Another object of the present invention is to provide a service channel transmission method that can efficiently transmit maintenance signals.

The service channel transmission method according to the present invention is as follows.

Consisting of one master station and multiple slave stations, the master station sends out time-division multiplexed signals, and the slave stations reproduce the signal sent from the master station as well as the timing signal. In a time division multi-directional multiplex communication system in which a signal is sent to a master station for a time allocated to each slave station as a reference, time slots for first and second channels that can be commonly used by each slave station are provided, The master station is always the first and second
channel /l/ wo is monitored and the first and second channels sent from the slave station to the master station are unused.

Each slave station monitors the first channel of the other station, and the first slave station that first uses the common channel sends a signal to the master station via the second channel,
The master station sends the second channel signal sent from the first slave station to each slave station via the first channel, and also sends the signal from the first slave station to the master station. In order to respond to the sent signal, the second slave station sends a signal to the master station via the first channel, and the master station receives the signal sent from the second slave station. By sending the signal of the first channel to each slave station via the second channel and monitoring the signal of the second channel in the first slave station, signals can be exchanged between arbitrary slave stations. When transmitting a signal between a master station and a slave station, transmitting a signal from the master station to each slave station via the second channel enables communication between the first slave station and the slave station. and the second slave station by transmitting a signal from the master station to each slave station via the first channel. .

Next, an embodiment of a service channel transmission system according to the present invention will be described with reference to one drawing.

FIG. 2 is a time chart showing an example of the frame structure of a signal applied to the present invention. 1 of these
Figure 1 (b) shows the conventional frame structure shown in Figure 1 with time slots for service channel transmission) C1 (1 and CH2 added).

This figure shows a signal sent from station B to the master station when the first slave station among the plurality of slave stations is assumed to be station B. According to this, the signal B and the above CH2 within the time SFB allocated to the B station are sent to the master station. Also, Figure 1 (C)
shows a signal sent from station A to the master station when the second slave station is assumed to be station A.

FIG. 3 is a block diagram showing a multiplexing and demultiplexing circuit on the slave station side in an embodiment to which the present invention is applied. In this figure, circuits 1 and 2 multiplex signals of service channels CH1 and CH2, respectively, into a main signal. In these multiplexing circuits 1 and 2,
The main signal to be sent to the master station is given from the signal line 101, and the signals of channels CHI and CH2 are respectively sent to the signal line 105.
and 106. The multiplexed signal is then sent to the master station via the signal line 102. Also, 3
and 4 are circuits that separate the signals of service channels CH1 and CH2, respectively, from the signals sent from the master station. Of these separation circuits 3 and 4, a signal of channel CHI is obtained from one separation circuit 3 via a signal line 107, and a signal of channel CH2 is obtained from one separation circuit 4 via a signal line 108. and 1 separation circuit 4
A main signal is obtained from the signal line 104 on the output side. 10
5 is a changeover switch, which connects the multiplexing signal given from the signal line 109 to the signal line 1o5. or a switch 5-1 that selectively switches to either the signal line 106 and the signal @
107. A switch 5-2 is also provided for selectively switching either the signal obtained at i or the separated signal obtained at 108. The changeover switch 5 is such that the first slave station that uses the service channel for the first time is switched to the channel CH2 side, and the other slave stations are always switched to the channel CH2 side.

FIG. 4 is a block diagram showing a multiplexing and demultiplexing circuit on the master station side in an embodiment to which the present invention is applied. In this figure, 11 and 12 are service channels CHI and C, respectively, which have the same functions as the slave station side.
A circuit for multiplexing the signal of H2, and circuits 13 and 14 separate the signals of service channels CH1 and CH2, respectively, as on the slave station side. 15 and 16
is a changeover switch. Among these, channel CH2 sent from the first slave station and obtained by the separation circuit 14
The signals to be sent from the master station to each slave station other than the first slave station are applied to the changeover switch 15 via signal lines 206 and 209, respectively.

Here, you can selectively switch to either one. Then, this selected signal is transmitted to channel C via signal line 207.
Provided to the multiplexing circuit 11 on the H2 side.

It is multiplexed with the main signal added from signal line 204. Further, the channel CHI signal sent from the second slave station and obtained by the separation circuit 13 and the signal sent from the master station to the first slave station are transmitted through signal lines 205 and 210, respectively.
is applied to the selector switch 16 via which it is selectively switched to either one. Then, this selected signal is given to the multiplexing circuit 12 for channel CH2 via the signal line 208, multiplexed with the output signal of the multiplexing circuit 11, and then sent to each slave station via the signal line 203. sent towards. As can be seen from such a switching circuit, when the master station does not send a service signal, the changeover switches 15 and 16 always switch to the channel CH received from the slave station.
2 and CHI signals are selected (as shown).

Referring to FIGS. 3 and 4 above, the operation of receiving service signals in the slave station and the master station will be described below.

First, the signal from the first slave station to the master station is sent to the service channel M number u to be sent out, and is given to the multiplexing circuit 2 of the channel qH2 via the switch 5-1, as shown in FIG. 2(b). C
It is multiplexed at the H2 position and sent to the master station. At the main station,
Channel CI (2 signals are separated from the signal sent from the first slave station by the 1 separation circuit 14, and
6 and multiplexing circuit 1 via switch 15.
given to 1. This signal is multiplexed in the multiplexing circuit 11 at the CHI position of the signal sent from the master station to the slave stations, and then sent to each slave station. On the other hand, the channel CHI signal sent from the master station is received by each slave station via the 1-separation circuit 3 and the switch 5-2, as is clear from the explanation of FIG. Therefore, the signal of channel CH2 transmitted from the first slave station is received by slave stations other than the first slave station and the master station. If the station that responds to this is a slave station, the response signal (signal line 10 of the slave station other than the first slave station)
9) is sent by switch 5-1 and multiplexing circuit 1 to the master station via channel CHI. In the master station, this signal is sent to the first slave station via the separation circuit 13° switch 16 and the multiplexing circuit 12, and the signal is sent to the first slave station through the separation circuit 4 and switch 5-2 (in the first slave station, -2 selects CH2) and is received by the first slave station. In addition, when the station responding to the first slave station is the master station, or when the master station first sends out a signal to the slave station, the switch 16 sends the signal from the master station via the signal line 210. Signal transmission between the master station and the slave station is performed by sending the .

As is clear from the above description, according to the present invention, the increase in signal transmission speed is only related to the two newly established channels, without affecting the transmission of the main signal, and between any two stations. This enables the transmission of service signals towards the

This has the great effect of maintaining system maintainability without expanding the radio frequency transmission band or reducing channel utilization efficiency.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing side numbers of a time division multidirectional multiplex communication system to which the present invention is applied, FIG. 2 is a time chart showing an example of a signal frame structure to which the present invention is applied, and FIG. 3 is a system diagram showing the side numbers of a time division multiplex communication system to which the present invention is applied. FIG. 4 is a block diagram showing a multiplexing and demultiplexing circuit on the slave station side in an embodiment to which the present invention is applied, and FIG. 4 is a block diagram showing a multiplexing and demultiplexing circuit in the master station side in an embodiment to which the present invention is applied. In the figure, 1, 2, 11, and 12 are multiplexing circuits. 3.4 and 13.1.4 are separation circuits, 5 and 15.16 are changeover switches, and 5-1.5-2 is a switch. 1st construction Figure 3 Figure 4

Claims (1)

[Claims] 1. Consists of one master station and multiple slave stations. The master station sends out a time division multiplexed signal, and the slave station reproduces the timing signal' from the signal sent from the master station,
Time slots of the first and second channels that can be commonly used by the Myoko station in a time-division multidirectional multiplex communication system that sends signals to the master station for the time allocated to each slave station based on the timing signal. A first slave station using the common channel first sends a signal to the master station via the second channel, and the master station receives the signal sent from the first slave station. The second channel transmits the signal of the second channel to each slave station via the first channel, and also responds to the signal sent from the first slave station via the master station. The slave station sends a signal to the master station via the first channel, and the master station transmits the first channel signal sent from the second slave station to the second channel. The first slave station monitors the signal on the second channel, thereby transmitting signals between arbitrary slave stations and transmitting signals between the master station and the slave stations. When transmitting signals, communication is carried out with the first slave station by transmitting the signal from the master station to each slave station via the second channel, and the signal from the master station is transmitted to each slave station through the second channel. 1. A service channel transmission system characterized in that communication is performed with the second slave station by transmitting data to each slave station via one channel.