JPH0685737A - Rural use small power radio communication system - Google Patents

Abstract

PURPOSE:To secure radio communication between a base station equipment and plural slave stations with excellent line quality and to reduce power consumption. CONSTITUTION:In the rural small power radio communication system among a single base station equipment 100 and plural slave station equipments 200a-200n, the base station equipment 100 is provided with plural small power single channel radio equipments, a directive or omnidirectional base station antenna used in common for the plural small power single channel radio equipment and a coupling/branch circuit coupling the plural small power single channel radio equipments and the base station antenna. Each of the slave station equipments 200a-200n is provided with a directional high gain antenna having a directivity to the base station antenna, a variable attenuator capable of optionally adjusting its output, and a small power radio equipment having an identification code in matching with an identification code of the small power single channel radio equipment of the base station equipment 100.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low power fixed wireless communication system, and more particularly, to a base station device (master station) and a plurality of low power transmitting / receiving devices suitable for use in the field of rural communication. It relates to a communication system between (slave stations).

[0002]

2. Description of the Related Art Conventionally, as a communication system such as subscriber telephones scattered in a rural area, instead of a wired connection which is expensive in equipment cost, a rural wireless communication system is used.
Analog multi-directional multiplex communication system by frequency division,
A time division digital multi-directional multiplex communication system is used. Both of these analog and digital multiplex communication systems are methods for selecting and designating an idle communication path and connecting when a communication call occurs.

[0003]

However, in the case of an analog multi-directional multiplex communication system by frequency division, in order to avoid radio wave interference due to cross modulation between communication paths,
Since it is necessary to use another transceiver for each different frequency, there is a drawback that the base station device consumes a large amount of power.

On the other hand, in the case of a time-division digital multi-directional multiplex communication system, only one transceiver is required for the base station device, but the frequency band width used is widened by the multiplexing, and the reception limit level is a single communication. It is 100 times more than the case of the road, and there is a drawback that high reception power is required.

Therefore, the present invention has been made in view of the above-mentioned drawbacks in the conventional rural communication system, and it is possible to secure a good line quality and reduce the power consumption of the base station device and the slave station device. It is an object of the present invention to provide a low power wireless communication system for a rural.

[0006]

According to the present invention, there is provided a low power wireless communication system for a rural between a base station apparatus having an automatic frequency selection function using an identification code and a plurality of slave station apparatuses, The base station apparatus includes a plurality of low power single channel radios, a base station antenna commonly used for the plurality of low power single channel radios, and a plurality of the low power unit radios. The one channel communication device and a coupling / branching circuit for matching and coupling the antenna, and the plurality of slave station devices each have a high directivity having a directivity with respect to the base station antenna. A gain antenna, a resistance attenuator capable of arbitrarily attenuating the output of the directional high gain antenna, and a low power radio having an identification code that matches the identification code of the low power single channel radio of the base station apparatus. And is composed of Low-power radio communication system for Lal is provided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a wireless communication system according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an example of the overall configuration of a wireless communication system according to the present invention. FIG. 2 shows an example of the configuration of a base station apparatus (master station) in the case where there are many subscribers to be handled and a coupling / branching circuit loss is large and a loss compensation transmitting / receiving amplifier is provided. FIG. 3 shows a configuration example of a base station device (master station) when the number of subscribers to be handled is relatively small. Then, FIG. 4 shows a configuration example of a subscriber wireless device (slave station).

First, referring to FIG. 1, an overall configuration of a wireless communication system according to the present invention will be described. Reference numeral 100 indicates a base station apparatus, and a plurality of low power single channel radios 1 each having a different identification code according to the number (n) of subscribers.
a to 1n. Reference numerals 200a to 200n indicate respective slave station devices, and include radios 11a to 11n individually corresponding to the low power single channel radios 1a to 1n included in the base station device 100. The base station device 100 and each of the slave station devices 200a to 200n are fixedly installed, and the distance between them is arbitrary. The base station device 100 can also be connected to a general telephone line via an exchange.

Next, a concrete configuration example of the base station apparatus 100 will be described with reference to FIGS. FIG. 2 shows a configuration example when there are many subscribers to be handled, and FIG. 3 shows a configuration example when there are relatively few subscribers.

In FIG. 2, reference numerals 1a to 1n are low-power single-channel radios (master units) having an identification code and an automatic frequency selection function, and provided by the number (n) of subscribers. Reference numeral 2 is a coupling / branching circuit of a plurality of wireless devices (master devices), and is configured in a series-parallel multi-stage according to the number of master devices. Reference numerals 3a and 3b indicate circulators for forming a circuit for both transmission and reception. Reference numerals 4a and 4b indicate transmission band pass filters corresponding to the transmission frequency of the low power single channel radio 1, and 4c and 4d similarly indicate reception bands corresponding to the reception frequency different from the transmission frequency. Shows a pass filter. Reference numeral 5 indicates a wideband amplifier for transmission,
This is to compensate for insertion loss due to the coupling / branching circuit 2 and the like. The wideband amplifier 5 for transmission needs to be capable of allowing intermodulation distortion with respect to the maximum composite output power when all the low power single channel radios 1a to 1n are operated. Reference numeral 6 indicates a receiving amplifier, which compensates for the loss due to the branch circuit and the increase in thermal noise. Finally, reference number 7
Indicates an omnidirectional high-gain antenna in the horizontal plane, and is installed with the required ground clearance secured in the required target area.

The transmission system of the base station 100 includes low power single channel radios 1a to 1n, coupling / branching circuits 2 and 2, a circulator 3a, a transmission band pass filter 4a, a wide band transmission amplifier 5, and a transmission circuit. It is formed by the signal path of the bandpass filter 4b, the circulator 3b, and the omnidirectional antenna 7. The receiving system consists of an omnidirectional antenna 7 and a circulator 3.
b, receiving band-pass filter 4d, receiving amplifier 6, receiving band-pass filter 4c, circulator 3a, coupling /
It is formed by the branch circuits 2 and 2 and the signal paths of the low power single communication path radios 1a to 1n.

FIG. 3 shows the configuration of the base station apparatus 100 when the number of subscribers is relatively small. In this case, the common circuit consisting of the circulators 3a and 3b, the wide band transmission / reception amplifiers 5 and 6, and the transmission / reception band pass filters 4a to 4d in FIG. In the exemplary embodiment 1a-1d) is coupled to the high gain directional antenna 8 via one coupling / branching circuit 2 or a plurality of coupling / branching circuits 2,2. The high gain directional antenna 8 is
The required ground clearance will be secured in the required target area, and subscribers will be accommodated according to direction. In the case of the illustrated embodiment, the small power single channel radios 1a and 1b corresponding to the slave stations installed at a long distance from the base station apparatus 100 have one coupling / branching circuit 2 so that the power loss is reduced. Is connected to the directional antenna 8 via. On the other hand, for a slave station installed at a relatively short distance from the base station apparatus 100, good communication performance can be obtained even if the insertion loss due to the coupling / branching circuit is large to some extent, and therefore it is compatible with such a slave station. The low power single channel radios 1c and 1d are connected to the directional antenna 8 via the coupling / branching circuits 2 and 2 of a plurality of stages.

FIG. 4 shows a configuration example of the slave station devices 200a to 200n. Each of the slave station devices 200a to 200n is a directional antenna directed to the omnidirectional antenna 7 or the directional antenna 8 of the base station 100, respectively. 9, loss compensator 10
And a wireless device 11. Slave station devices 200a to 20
The antenna gain and antenna height are distributed to each directional antenna 9 of 0n according to the section distance between the base station and the slave station, and the loss compensating attenuator 10 is used to further equalize the loss between the slave station devices. Is planned. The low-power subscriber radio 11 is connected to a high-gain external antenna 9 having a ground height of several meters, so that the communicable distance can be increased.

[0014]

According to the present invention, a master station of a low power radio such as a cordless telephone is installed in a base station (telephone switching station or telephone cable end) as many as subscribers to make a master station device and a slave station. By providing the caller discrimination and the selective call function between the two, the control cost can be reduced in a small scale. In addition, even if the power is small, it is possible to expect the stabilization of the section loss by limiting the handling target to the fixed subscribers, and by ensuring the antenna gain and the antenna high gain of the base station and slave stations, high quality You can secure a sufficient communication distance in.
Each radio has low power consumption because of its small output facility, and it is easy to set up in a non-powered area such as the use of solar cells for rural communication.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a low power wireless communication system for a rural space according to the present invention.

FIG. 2 is a block diagram showing a configuration of a base station device when the number of subscribers (slave stations) is large.

FIG. 3 is a block diagram showing a configuration of a base station device when the number of subscribers (slave stations) is small.

FIG. 4 is a block diagram showing a configuration of a subscriber station (slave station).

[Explanation of symbols]

 1a to 1n Low-power single-channel radio device (master device) 2 Coupling / branching circuit 3a, 3b Circulator 4a, 4b Transmission bandpass filter 4c, 4d Reception bandpass filter 5 Transmission wideband amplifier 6 Receiver amplifier 7 Horizontal omnidirectional high gain antenna 8 High gain directional antenna 9 High gain directional antenna 10 Loss compensation attenuator 11 Low-power subscriber radio (slave) 100 Base station 200 Slave station

Claims (4)

[Claims] 1. In a low power wireless communication system for a rural between a base station device having an automatic frequency selection function using an identification code and a plurality of slave station devices, the base station device is provided with a plurality of low power devices. A single channel radio, a base station antenna commonly used for the plurality of low power single channel radios, a plurality of the low power single channel radios and the antenna A plurality of slave station devices, each of which has a directivity high gain antenna having directivity with respect to the base station antenna, and the directivity high gain antenna. A variable attenuator capable of arbitrarily adjusting the output of the base station device and a low power radio device having an identification code matching the identification code of the low power single channel radio device of the base station device. Rural low power wireless communication system . 2. The low power wireless communication system for a rural system according to claim 1, wherein the base station device further comprises a wide band for transmission commonly used for the plurality of low power single channel radios. A low-power wireless communication system for a rural, characterized by comprising an amplifier and a receiving amplifier in a transmission system and a reception system, respectively. 3. The low power wireless communication system for a rural system according to claim 2, wherein the antenna of the base station is an omnidirectional antenna. 4. The low power radio communication system for a rural system according to claim 1, wherein the base station antenna has a plurality of directional high gains individually directed to the directional high gain antennas of the plurality of slave station devices. A low-power wireless communication system for a rural characterized by comprising an antenna.