JPH0413895B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a wireless individual paging device that transmits a message from a transmitter installed at a fixed location to the owner of a mobile device.

"Prior Art" Conventionally, an individual password and a message from the transmitter are transmitted as radio waves from a repeater to a mobile device,
Techniques have been developed to simplify transmission equipment and reduce its cost, overcome radio interference caused by buildings or high-voltage lines, and expand service areas.

"Problems to be Solved by the Invention" The above-mentioned conventional technology requires the installation of multiple repeaters within a service area, but when each repeater transmits simultaneously, the area (zone) covered by each repeater is Near the border, there was a problem where radio waves from both repeaters interfered, making it difficult to receive good reception.

``Means for Solving the Problems'' However, the present invention provides a transmitter that encodes an individual password and a message and outputs it as a modulated wave signal, and a plurality of transmitters that emit the modulated wave signal from the transmitter as radio waves. A wireless individual paging device comprising a repeater and a mobile device that receives radio waves from the repeater and broadcasts a message when individual PIN numbers match, wherein a repeater selection signal is sent to the output of the transmitter. Only the repeater specified by the repeater selection signal transmits the individual PIN and message, and by sequentially switching the repeater selection signal, each repeater has the same individual PIN and message. It performs time-division transmission of messages.

``Operation'' Therefore, messages can be properly transmitted without causing radio wave interference near the boundaries of the zones covered by the repeater.

"Example" Hereinafter, an example of the present invention will be described in detail based on the drawings. Fig. 1 is an explanatory diagram showing the overall configuration, and Figs. 2 and 3 are explanatory diagrams showing the zone arrangement of the service area for transmitting messages. Transmitter 1 outputting as a modulated wave signal
and first and third repeaters 2a, 2b, 2c that emit the modulated wave signal from the transmitter 1 as radio waves.
and a plurality of mobile devices 3 that receive radio waves from the repeaters 2a, 2b, and 2c and broadcast a message when the individual passwords match, and transmit the modulated wave signal output of the transmitter 1 for commercial use. Transmitter 1 to input to repeaters 2a, 2b, 2c via power line 4
and repeaters 2a, 2b, and 2c are connected by a commercial power line 4 through a plug 5 and an outlet 6, and transmits a modulated wave output modulated by digitally encoded transmission data (message, etc.) The mobile device 1 transmits the modulated wave signal to the commercial power line 4, and the repeaters 2a, 2b, 2c receive the modulated wave signal, convert it into radio waves, and emit them into the air, and the mobile device 3 receives the radio waves. It is configured to transmit a message to the holder by acoustic or visual means or vibrations generated by a motor when the individual PIN numbers match.

Then, as shown in Figure 2, the entire service area 7 is
It is divided into small zones, B zone, and C zone, and the first to third repeaters 2 are installed in each zone A to C.
a, 2b, and 2c, respectively, and transmitter 1.
The first repeater selection signal included in the output of
This determines which of the third repeaters 2a, 2b, and 2c to transmit from, and each repeater 2a, 2b,
By sequentially switching and outputting the repeater selection signal corresponding to 2c, the same individual PIN and message can be sent to A to C by each repeater 2a, 2b, 2c.
Can be sent to zones in time division. Therefore,
For example, when transmitting from each repeater 2a, 2b, 2c at the same time, the radio waves from each repeater 2a, 2b, 2c will interfere near the boundaries of zones A to C, and the mobile device 3
However, by time-divisionally transmitting to zones A to C, interference can be prevented.
Messages can be sent properly.

Furthermore, as shown in Fig. 3, by arranging multiple zones A to C so that the same zones are not arranged adjacent to each other, repeaters 2a, 2b, and 2c can be added to the service area 7, which is wider than that in Fig. 2, and the zones Messages can be transmitted while preventing radio wave interference at boundaries, and the service area 7 can be expanded arbitrarily.

Furthermore, Fig. 4 shows a modification of Fig. 3,
If the radio waves are likely to interfere even if they are divided into three zones and time-divisionally transmitted as shown in Figure 3, service area 7
Radio wave interference can be easily resolved by increasing the number of time division zones within the zone, forming zones D to I in addition to zones A to C, and arranging these zones A to I so that the same zones are not adjacent to each other. It is possible.

Incidentally, instead of the commercial power line 4, indoor wiring such as a telephone line or wired radio/TV wiring, as well as household wiring can easily be used in common.

"Effects of the Invention" As is clear from the above embodiments, the present invention includes a transmitter 1 that encodes an individual password and a message and outputs it as a modulated wave signal, and a transmitter 1 that transmits the modulated wave signal from the transmitter 1 into a radio wave. a plurality of repeaters 2a, 2b, 2c, and the repeaters 2a, 2
A wireless individual paging device comprising a mobile device 3 that receives radio waves from the transmitter 1 and 2c and broadcasts a message when the individual PIN numbers match, including a repeater selection signal in the output of the transmitter 1, The repeaters 2a, 2b, designated by the repeater selection signal
Only the relay machine 2c transmits the individual password and the message, and each of the relay machines 2a, 2b, and 2c time-divisionally transmits the same individual password and message by sequentially switching the relay machine selection signal, Messages can be properly transmitted without causing radio wave interference near the boundaries of the zones that the repeaters 2a, 2b, and 2c are in charge of, and the repeaters 2a, 2b, and 2c can function properly in the wireless individual paging system. This has a remarkable effect.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the overall configuration showing one embodiment of the present invention, Figs. 2 and 3 are explanatory diagrams of the zone arrangement of a service area for transmitting messages, and Fig. 4 is a zone arrangement showing a modification of Fig. 3. It is an explanatory diagram. 1...Transmitter, 2a, 2b, 2c...Relay machine, 3...
Mobile device, 4...Commercial power line.

Claims (1)

[Claims] 1 A transmitter 1 that encodes an individual password and a message and outputs it as a modulated wave signal, a plurality of repeaters 2a, 2b, 2c that emits the modulated wave signal from the transmitter 1 as radio waves, and the relay machine 2
In the wireless individual paging device, the transmitter 1 includes a repeater selection signal in the output of the transmitter 1. and the repeater 2a specified by the repeater selection signal,
Only the relay machines 2b and 2c transmit the individual password and the message, and each of the relay machines 2a, 2b, and 2c time-divisionally transmits the same individual password and message by sequentially switching the relay machine selection signal. A wireless individual paging device characterized by: