JPS6376533A - Multiddirectional multiplex communication device - Google Patents

Abstract

PURPOSE:To quickly transmit emergency information to a master station from a sub-station without waiting for the call of the master station, by providing a common transmitting means, through which any substation can send the emergency information during the period of a common transmitting time provided for the purpose of transmitting the emergency information during a polling period. CONSTITUTION:Each polling information processing circuit (PPU) 2 checks whether emergency information exists or not in each emergency information storing circuit ED 4 and, if emergency information exists in, for example, a sub-station T1, the PPU 2 of the sub-station T1 sends the emergency information from the ED 4 of the sub-station T1 to the received signal processing circuit (TX DPU) 10 of the sub-station. T1. The TX DPU 10 of the sub-station T1 mixes the emergency information in polling time slots and, simultaneously, sends a burst-on signal to the modulator circuit (TX) 8 of the sub-station T1. Thus the emergency information is transmitted to a master station 20. Therefore, any emergency information produced in any sub-station can be transmitted to the master station 20 without waiting one polling period even in the worst case.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-directional multiplex communication system consisting of one master station and a plurality of slave stations.

[Prior Art] Conventionally, in a polling control method in this type of multidirectional multiplex communication device, a master station calls the slave stations in turn,
The slave station detected a call from the master station and immediately sent station information.

[Problems to be solved] However, in the conventional dual polling control method, a slave station can only send station information to the master station once per polling cycle, so If one polling cycle becomes long, in the worst case you will have to wait one polling cycle before transmitting highly urgent information to the master station, and emergency information generated within the slave station will be sent to the master station as soon as possible. The drawback is that it cannot be done.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a multidirectional multiplex communication device that can promptly transmit emergency information from a slave station to a master station without waiting for one polling cycle.

[Means for Solving Problems] In order to achieve the above object, the multidirectional multiplex communication device of the present invention provides m time slots (m is a natural number) common to all slave stations within one polling period in a polling channel. and each slave station has a means for identifying whether the polling information from the master station is its own station designation information or the common time slot designation information; means for communicating management control information with the master station at the time of designation, and for communicating with the master station an identification signal and an information signal of the slave station from any slave station that wishes to send information to the master station at the time of designation of a common time slot; This is the configuration that has.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention, and shows a case where communication is performed between a master station 20 and n slave stations Tl-Tn using a wireless time division multidirectional multiplex communication system. In this method, the master station 20 continuously sends out multiplexed time division 0 in multiple directions to each slave station T1 to Tn, and each slave station Tl to Tn synchronizes with the signal sent from the master station 20. The signals assigned to the own station are extracted by performing clock reproduction and frame period, and each slave station T1 to Tn receives the signal assigned to each slave station Tl to Tn based on the above frame synchronization signal. Time tl.

t2. . . . , the signal is sent out in bursts for tn. Signal SI sent from each slave station T1 to To.

S2. ..., Sn is the signal S in Figure 1 at the master station 20.
They are controlled so that they are arranged in order on the time axis, as shown below.

Note that F in the figure indicates one frame of the signal S, and tl, t
2. . . , tn indicates the time allocated to each slave station T1 to Tn, and P indicates a polling channel for managing and controlling each slave station from the master station 20.

In FIG. 1, each slave station T, -Tn leads a modulated wave to an antenna (hereinafter abbreviated as ANT) 5 and a demodulation circuit (hereinafter abbreviated as RX) 7 from this ANT 5, which will be described later. A 7-antenna common circuit (hereinafter referred to as BC) 6 that guides a modulated wave from a modulation circuit (hereinafter referred to as TX) 8 to be described later to the ANT 5, demodulates a baseband signal from the modulated wave, and performs clock synchronization and reproduction. The Rx to be carried out
7 and a received signal processing circuit (hereinafter referred to as "reception signal processing circuit") which corrects the error in the baseband signal sent from RX7 to create a frame pulse, and creates a timing signal indicating the time assigned to the own station and the time position of the polling channel. ,RX
The signals sent from the polling information processing circuit (hereinafter abbreviated as PPU) 9 and the polling information processing circuit (hereinafter abbreviated as PPU, the details of which will be described later) 2 are multiplexed to the polling channel, and sent to the master station 20 using the synchronization clock and frame pulse. Transmission signal processing circuit that creates the timing signal for the burst to be transmitted (
(hereinafter abbreviated as TX DPU) IO and 1. :(7)
TX DPUlo modulates the incoming baseband signal sent by J41, and controls the burst ON10F based on the burst control signal sent from the TX DPUIO.
An identification circuit that identifies whether it is local station designation information or common time slot designation information from the baseband signal sent from the TX8 that performs F control and the timing signal indicating the temporal position of the polling channel sent from the RX7.
Based on the DET (hereinafter abbreviated as DET) 1 and the identification signal sent from this DET 1, when the own station is designated, the management control information storage circuit (hereinafter abbreviated as SD) 3 performs management control. The PPU 2 transmits emergency information from an emergency information storage circuit (hereinafter abbreviated as ED) 4 to the TX DPUIO when a common time slot is specified and it is necessary to transmit emergency information.

FIG. 2 is a time chart showing an example of the reliability of each circuit section in the embodiment of FIG. 1. In the same figure, (a) represents the baseband signal output from each slave station T+ to Tn (7) each RX DPU9, and 31 to Sn represent each slave station T
Signals assigned to 1 to Tn, P1 to Pn and C1 to c
o is a polling channel signal, P1 to Pn is information specifying each slave station T, -Tn, and C1 to Cn is a signal for each slave station T.
1 to Tn share common time slot designation information. Further, F represents one frame period, and P represents l polling period.

The figure (b) is a timing signal indicating the temporal position of the polling channel output from each RX DPU9 of the slave stations Tl-Tn, and the figure (e) is a slave station based on the timing signal of the figure (b). The self-station designation information detected by DET1 of T1, and (d) in the same figure shows the temporal position of the common time slot designation information detected by DET1 of slave stations T and -T, respectively. In the figure (e), the PPU2 of the slave station T1 detects the TX DPUlo of the slave station Tl based on the detection signal of the figure (c).
The figure (f) shows the management control information outputted to the slave station T1 by the PPU2 of the slave station T1 based on the detection signal of the figure (d).
The emergency information output to DPUIO is shown in (g) and (
h) is the baseband signal output from the TX DPUIO of slave station T1, burst ON/OF 1lJ
The I'R signals are shown respectively.

In the above configuration and timing chart, the operation of FIG. 1 will be explained.

First, assume that the master station 20 sends station designation information to the polling channel in order to call the slave station T1. Then, each slave station T1 to T receives the polling channel timing signal (Fig. 2(b)) sent from each RX DPU9.
)), each DETl uses the polling channel P1-Pnf! of the base/kund signal (FIG. 2(a)) sent from the RX DPU9. : Monitor and DE of slave station T1
TI detects that its own station has been designated and sends a detection signal (second
(C)) to the PPU2 of the slave station Tl. Therefore, PPU2 of slave station T1 sends management control information from Sn2 to slave station T+ (7) TX D PU I O.
Figure (e)), the TX DPUIO of slave station T1 maxes the management control information into the polling time slot (Figure 2 (g)), and at the same time turns on slave station T+ (7) TX8
The signal (Fig. 2 (h)) is sent, and the management control information is transmitted to the master station 2.
0 is sent.

In the next frame, the master station 20 sends common time slot designation information +y to the polling channel in order to notify each slave station that this is a common time slot in which emergency information may be sent. Each slave station T1 to Tn receives a polling channel timing signal (see FIG. 2(b)) sent from the RX DPU 9 of each slave station T1 to Tn.
Based on the detection signal ( FIG. 2(d)) is sent to each DPU2. Each PPU2 checks whether there is emergency information in each ED4. For example, if there is emergency information in the slave station T1, the PPU2 of the slave station Tl checks whether there is emergency information in the slave station T1.
Emergency information is sent from D4 to the TX DPUIO of the slave station Tl (Fig. 2 (f)), and the TX DPUIO of the slave station T1
The emergency information is maximized in the polling time slot (Fig. 2 (g)), and at the same time, the TX8 of the slave station T1 is
The emergency information is sent to the master station 20 by sending the N signal (Fig. 2 (f)).
sent to.

With the above operation, emergency information generated in any of the slave stations can be transmitted to the master station 10 without waiting for l polling cycles in the worst case.

It should be noted that the tree design is not limited to the above example.
Various modifications are possible within the spirit of the invention.

For example, in the above embodiment, a case has been described in which the polling channel has n common time slot designated times for n slave station designated times, but in general, n slave station designated times It is clear from the above description that the present invention can be applied also to a case where m common time slot designation times are provided for (m and n are natural numbers).

[Effects of the Invention] As explained above, the present invention has a common transmission means that allows the slave stations to transmit emergency information during the common transmission time provided for transmitting emergency information within the polling cycle. The station has the advantage of being able to quickly send emergency information to the parent station without waiting for the parent station to call its own station.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
2 is a time chart showing an example of signals of each circuit section in the embodiment of FIG. 1. FIG. l: Identification circuit (DET) 2: Polling information processing circuit (PPU) 3: Management control information storage circuit (SD) 4: Emergency information storage circuit (ED) 5: Antenna (ANT) 6: Antenna sharing Circuit (B C) 7: Demodulation circuit (RX) 8: Modulation circuit (TX) 9: Reception signal processing circuit (RX DPU) 10: Reception signal processing circuit (TX DPU) 20: Master station T, -Tn: Child station

Claims (1)

[Claims] A multidirectional multiplex communication device consisting of one master station and a plurality of slave stations, the transmission path between the master station and the slave stations having a polling channel for the master station to manage and control each slave station using a polling method. In the polling channel, there are m time slots (m is a natural number) common to all slave stations within one polling cycle, and each slave station receives polling information from the master station based on its own designated time slot. Is it information?
means for identifying whether the information is the common time slot designation information; and based on the identification result, any means for communicating management control information with the master station when designating its own station, and transmitting information to the master station when designating the common time slot; A multi-directional multiplex communication device characterized by comprising means for communicating an identification signal and an information signal of the slave station from the slave station to the master station.