JPH04196626A - Mobile communication system - Google Patents

Abstract

PURPOSE:To attain mobile communication through the use of a small radio terminal equipment having a weak transmission power such as a portable radio equipment without installation of a relay station by using an automobile telephone radio terminal equipment so as to relay and send a signal sent from a small sized radio to a base station. CONSTITUTION:A weak transmission signal is sent from a small sized radio terminal equipment 100 such as a portable telephone set. An automobile telephone radio terminal equipment 103 mounted on an automobile 102 passing in the vicinity of the small sized radio terminal equipment 100 receives a signal from the small sized radio terminal equipment 100 when a reproduction relay on/off switch 108 is closed except the operating state by the reproduction of the transmission signal from the other small sized radio terminal equipment and by talking by an automobile passenger, reproduces it and sends the reproduced signal to a base station 110. Then the transmission signal from the base station 110 is sent directly to the small sized radio terminal equipment 100. Thus, the mobile communication service by the small sized radio terminal equipment by using weak transmission power is attained without installation of the relay station.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention realizes mobile communication using a small wireless terminal with weak transmission power using an inexpensive wireless transmission system.

[Conventional technology]

Conventionally, as a method of recovering weak wireless transmission signals in mobile communications, an inexpensive station dedicated to wireless relaying has been installed around a base station to eliminate dead zones.

FIG. 2 shows the configuration of a mobile communication system. 1
is a mobile terminal, 2 is a transmission signal of the mobile terminal, 3 is a relay station, 4 is a base station, and 5 is a relay signal of the base station.

In the operation of this mobile communication, a signal transmitted from a mobile terminal 1 is received and amplified by a relay station 3, and then transmitted to a base station 4. The signal from the base station 4 to the mobile terminal is relayed to the relay station 3.
is received and relayed to the mobile terminal.

[Problem to be solved by the invention] Due to this configuration, it is necessary to always provide a relay station within the mobile communication service area, which increases construction costs and costs for maintaining the relay station. There were drawbacks such as the cost.

In order to solve these drawbacks, the present invention enables mobile communication using small wireless terminals such as mobile phones that have weak transmitting power without constructing relay stations.

[Means for Solving the Problems] The present invention is characterized in that, in a mobile telephone system, a car telephone radio terminal is used as a relay station to communicate between a small radio terminal and a base station.

〔Example〕

FIG. 1 shows the configuration of the present invention. 100 is a small wireless terminal represented by a mobile phone, 101 is a signal transmitted from the small wireless terminal, 102 is a car passing near the small wireless terminal, 103 is a car phone wireless terminal installed in the car, and 104 is a car A telephone transmission circuit, 105 a car telephone receiving circuit, 106 a car telephone communication circuit, 107 a regenerative relay circuit, 108 a regenerative relay on/off switch, 109 a signal transmitted from the car telephone, 110 a base station, 11
1 is a terrestrial network, 112 is a mobile communications exchange, 1
13 is a transmission signal from the base station.

The operation of this method is as follows.

■A weak transmission signal is transmitted from the small wireless terminal 100.

- When the regeneration relay on/off switch 108 is on, the car phone wireless terminal receives signals from the small wireless terminal 100, except when it is being used for a call by a car passenger or for reproducing a signal transmitted from another small wireless terminal. It reproduces the signal and transmits the reproduced signal to the base station 110. This regenerative relay does not identify and designate a specific small wireless terminal before relaying, but rather it meets certain conditions (when the signal from the small wireless terminal can be received at a certain level or above). All signals from small wireless terminals that satisfy the conditions (when the signal is from a terminal) are relayed indiscriminately.

- When the regeneration relay on/off switch 108 is off, the car phone wireless terminal 103 only performs calls by the car occupant, and does not relay signals from the small wireless terminal 100.

■The transmission signal from the base station 110 is directly sent to the small wireless terminal 10.
Sent to 0.

In this example, the car phone wireless terminal 103 is the small wireless terminal 1.
00 is reproduced and relayed to the base station 110, it is also possible to demodulate the voice signal once through the car telephone wireless terminal 103, modulate it again, and transmit it to the base station 110. Another possible method is to simply amplify the received signal using an amplifier and then relay the received signal without reproducing the signal.

Furthermore, communication in which a signal emitted from the small wireless terminal 100 is not only relayed once by one car phone wireless terminal, but also relayed one after another by a plurality of car phone wireless terminals is also possible. In this method of relaying,
Since the signal from one small wireless terminal is sequentially relayed to a plurality of mobile phone wireless terminals, there is a drawback that the number of relays increases exponentially. Therefore, in order to avoid increasing the number of relays for the sake of constant yield, the following configuration and improvement can be considered.

FIG. 3 shows a signal configuration diagram of a signal transmitted from a small wireless terminal. 200 is one frame, and 201 is count data indicating a regenerative relay line.

In communication that is relayed one after another by a plurality of car phone wireless terminals, count data 201 indicating the number of times of regeneration and relay provided in the transmitted signal is set to 1 each time the count data 201 is regenerated and relayed.
In this method, the number is increased and relayed, and the relay is stopped when the value reaches a predetermined value. This method allows the relay distance to be kept at a constant value.

FIG. 4 shows the billing status of the owner of a car telephone wireless terminal having a relay function, where (a) shows a case where the call charge is discounted, and (b) shows a case where the basic charge is discounted. 30
0 is the call charge, 301 is the basic charge, 302 is before discount, and 303 is after discount.

After the car phone wireless terminal 103 relays the transmission signal from the small wireless terminal 100, it notifies the base station 110 that the signal has been relayed, thereby incrementing the charge accumulation counter in the terrestrial network 111, from 302 to 303 in the figure. discount on call charges.

Alternatively, by discounting the basic charge when billing, the owner of the car phone wireless terminal is rewarded for the relay.

[Effects of the Invention] According to the present invention, there is no need to install a relay station on the ground, and construction costs can be reduced.

□Furthermore, since the car telephone wireless terminal is always supplied with power, it is possible to reduce the maintenance cost of the repeater. Furthermore, since there is no need to construct relay stations, mobile communication services using small wireless terminals with weak transmission power can be quickly implemented.
It becomes possible to provide

For the owner of a car telephone wireless terminal, it is possible to receive a return of profits just by driving the car and without doing any work.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the present invention, Fig. 2 is a block diagram of a conventional car telephone system, Fig. 3 is an example of a transmission signal structure, and Fig. 4 is a state of billing by the owner of a car telephone wireless terminal used for relaying. It is. 100... Small radio terminal, 110... Base station, 112... Mobile communication exchange 102... Car telephone radio terminal used for relay. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In a mobile communication system including a small radio terminal, a car phone radio terminal, and a base station, the car phone radio terminal receives a signal transmitted from the small radio terminal, reproduces or relays and amplifies the signal, and transmits it to the base station. A mobile communication system characterized in that the mobile phone wireless terminal relays a signal transmitted from the small wireless terminal to a base station.