JPH07154850A - Indoor service system for portable telephone - Google Patents

Abstract

PURPOSE:To provide an inexpensive indoor service system for portable telephones capable of easily performing the indoor service for the portable telephones, mainly PHP terminals, even inside the buildings and underground structures where radio waves transmitted from the antenna of an outside public base station hardly reach. CONSTITUTION:In this indoor service system for the portable telephones for performing the service to the PHP terminals by radio through the antenna 4 provided outside the main body 1 of the public base station of PHP connected to a telephone circuit 2, an outdoor relay antenna 6 is provided near the antenna 4 and an indoor relay antenna 8 is provided inside the building 5 and the underground structure where the radio waves hardly reach. The outdoor relay antenna 6 and the indoor relay antenna 8 are connected by a coaxial cable 7 and the service is performed for the PHP terminals inside the building 5 and the underground structure by the main body 1 of the public station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can be applied to mobile phones, typically on floors of buildings where public base stations of PHP (Personal Handy Phone) are installed and in places where radio waves are hard to reach in underground malls. The present invention relates to an indoor service system of a mobile phone which provides a means for realizing the service.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing a system configuration example of a conventional PHP (Personal Handy Phone) service system. As shown in the figure, the conventional PHP service system uses a public base station main unit 1 connected to a telephone line 2, a transmitting unit 3, and a building 5.
It is composed of an antenna 4 provided on the roof of the car.

The signal transmitted from the telephone line 2 is processed by the public base station main body 1 and is transmitted through the transmitting section 3 to the antenna 4
Transmitted as radio waves from the PHP and carried by people
A conversation is carried out by being received by a terminal (not shown). Usually, the antenna 4 is provided outdoors such as on the roof of a building and transmits with a transmission output of 500 mw.

[0004]

However, although the above method can provide sufficient service when the PHP terminal is outdoors, it is difficult for the PHP terminal to reach a radio wave in a building or underground mall. When it is in, communication becomes impossible. In order to solve this, it may be possible to install a relay station at each incommunicable place, but there is a problem that the cost rises and the installation work becomes large-scale.

The present invention has been made in view of the above points, and an object of the present invention is to eliminate the above-mentioned problems and provide a simple and inexpensive indoor service system for mobile phones.

[0006]

SUMMARY OF THE INVENTION To solve the above problems, the present invention provides a wireless mobile phone, typically a PHP terminal, through an antenna provided outside a public base station connected to a telephone line. In an indoor service system for a mobile phone that performs service, according to a typical PHP example, an antenna provided outside the public base station body 1 connected to a telephone line 2 as shown in FIG. 4, an outdoor relay antenna 6 is provided, an indoor relay antenna 8 is provided in a building 5 or an underground structure where radio waves are hard to reach, and the outdoor relay antenna 6 and the indoor relay antenna 8 are connected by a coaxial cable 7. Connect to the public base station and use P in the building 5 or underground structure.
The service is provided to the HP terminal (mobile phone).

[0007]

In general, the radio waves transmitted from the antenna 4 of the public base station provided outdoors are hard to reach the building 5 and the underground structure, so the service to the PHP terminal (mobile phone) is disabled. . According to the present invention, as described above, the outdoor relay antenna 6 is provided in the vicinity of the antenna 4, the indoor relay antenna 8 is provided in the building 5 or the underground structure, and both antennas are connected by the coaxial cable 7. It becomes possible to provide indoor service for PHP terminals (mobile phones).

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an indoor service of a PHP to which the present invention is applied.
It is a figure which shows the block structural example of a screw system. As shown in the figure, the PHP indoor service system of the present embodiment has a public base station main body 1 connected to a conventional telephone line 2, a transmitter 3, an antenna 4 provided on the roof of a building 5, and the like. , An outdoor relay antenna 6 installed near the antenna 4, an indoor relay antenna 8 installed in a place where radio waves are hard to reach, and a coaxial cable 7 for connecting the outdoor relay antenna 6 and the indoor relay antenna 8 are added. It is composed.

The signal transmitted from the telephone line 2 is processed by the public base station main body 1 and is transmitted through the transmitting section 3 to the antenna 4
It is transmitted as a radio wave from. The radio wave signal passes through the coaxial cable 7 via the outdoor relay antenna 6, is radiated from the indoor relay antenna 8, and is received by a PHP terminal (not shown) in the vicinity thereof. Therefore, the PHP terminal can communicate with the indoor relay antenna 8 even in a place where radio waves are hard to reach. The same applies when transmitting from the PHP terminal.

FIG. 2 is a diagram showing the characteristics and call distance of each part of the indoor service system of the PHP of the present invention. In the figure, the characteristics of each component are set and calculated as follows. The loss of the coaxial cable 7 connecting the outdoor relay antenna 6 and the indoor relay antenna 8 and the propagation of the outdoor relay antenna 6 are shown. If the loss or the like is large, it indicates that the service area of the indoor relay antenna 8 is narrowed accordingly.

The antenna 4 and the outdoor relay antenna 6 are close to each other in distance and follow the law of free space propagation.
= 2, and the attenuation characteristics of the indoor relay antenna 8 and the antenna of the PHP terminal were also calculated with the attenuation constant α = 2.
The base station transmission power transmitted from the transmitter 3 is 36 dBm,
The gain of the base station antenna 4 is 6 dB, the gain of the outdoor relay antenna 6 is 12 dB, and the gain of the indoor relay antenna 8 is 6 d.
B, the loss of the coaxial cable (50 m) 7 is -10 dB, and when the distance between the antenna 4 and the outdoor relay antenna 6 is 10 m, the propagation loss between both antennas is -58 dB (-54 dB for 5 m).
Calculated as dB).

As a result, when the outdoor relay antenna 6 is installed 10 m away from the public base station antenna 4, the transmission power from the indoor relay antenna 8 is -8 dB, and the propagation between the indoor relay antenna 8 and the antenna of the PHP terminal. Loss is -72
In dB, the communication distance is 50 m, and when installed at a distance of 5 m, the transmission power from the indoor relay antenna 8 is -4d.
B, the propagation loss between the indoor relay antenna 8 and the antenna of the PHP terminal was -76 dB, and the callable distance was 80 m, which was a result that was sufficiently practical.

[0013]

As described in detail above, according to the present invention, the following excellent effects are expected. As mentioned above, an outdoor relay antenna is installed near the public base station antenna, an indoor relay antenna is installed in a building or underground structure, and both antennas are connected by a coaxial cable. It becomes possible to service. Therefore, it is possible to use the conventional public base station as an indoor service for a mobile phone at low cost and with simple construction.

[Brief description of drawings]

FIG. 1 is a diagram showing a block configuration example of an indoor service system of PHP in an embodiment of the present invention.

FIG. 2 is a diagram showing the characteristics and call distance of each part of the indoor service system of PHP in one embodiment of the present invention.

FIG. 3 is a diagram showing a block configuration example of a conventional PHP service system.

[Explanation of symbols]

 1 Public Base Station Main Body 2 Telephone Line 3 Transmitter 4 Antenna 5 Building 6 Outdoor Relay Antenna 7 Coaxial Cable 8 Indoor Relay Antenna

Claims (1)

[Claims] 1. A mobile phone is wirelessly supported through an antenna provided outdoors in a public base station connected to a telephone line.
In an indoor service system for a mobile phone that performs screwing, an outdoor relay antenna is provided in the vicinity of the antenna, and an indoor relay antenna is provided in a building or structure where radio waves are hard to reach, and the outdoor relay antenna and the indoor relay are provided. An indoor service system for a mobile phone, wherein an antenna is connected by a coaxial cable and the public base station provides service to the mobile phone in the building or structure.