JPS59205834A - Radio communication system in radio wave shielding building - Google Patents

Abstract

PURPOSE:To eliminate the leakage of a radio wave to the outside of a building by constituting window glass parts of a pane where a radio wave shielding material body of the radio wave is formed as a glass surface layer or with a pane which is formed by mixing a shielding material body of a received wave. CONSTITUTION:The window glass of the window glass part B of the building A constituted by outer walls made of concrete shielding the radio wave is formed by forming the shield material body of the radio wave as the glass surface layer or forming the glass material body mixed with the shield material body. The correspondence with an external device is conducted by transmitting a signal called from each terminal device 9 through a cable or an optical fiber 7 through a central transmission/reception controller 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wireless communication system in a radio wave shielding building in which the space inside the building is electromagnetically shielded from the outside space and the field strength of radio waves leaking into the outside space of the building is below a certain standard.

In general, when wireless communication is performed only within a building using a wireless device installed inside the building, even if the wall of the building is made of concrete that attenuates and blocks radio waves, This is because the windows are made of glass that is not shielded from electricity.

Transmitted radio waves from outside the building enter the building through the window glass. In addition, if the transmission output of a wireless device for intra-building communication installed inside the building is increased, the radio waves will be radiated outside the building because the window glass is not electromagnetically shielded8. interfere with radio waves.

In addition, if the output of the wireless device is a so-called weak radio wave that is not subject to the Radio Law, that is, a radio wave with an electric field strength of 15 microvolts per meter or less at a distance of 100 meters, communication that uses the normal modulation format That's enough S
/N cannot be obtained and the quality of the call deteriorates. Therefore, whether a high-power wireless device licensed under the Radio Law is required, or
To do this, it is necessary to receive frequency allocation for radio waves in the VHF band and UHF' band, which are easy to use, but the supply and demand for radio waves in these frequency bands is tight and it is difficult to receive permission to allocate waves. .

Therefore, due to the above reasons, etc., at present.

It cannot be denied that the achievement of the ability to perform wireless communication only inside a building without requiring communication with the outside of the building is lagging behind.

In view of this point, the present invention provides a wireless shielding building that has electromagnetic shielding glass as a window part, and is capable of completely shielding the interior space and exterior space of a radio wave shielding building so that wireless communication can be performed only in the interior space. The system provides a communication method, which will be explained in detail below based on the drawings.

FIG. 1 is a schematic diagram showing an embodiment of the system of the present invention. In the same figure, 1 is one floor in the building Δ, which is made up of a concrete outer wall that blocks radio waves, and it is assumed that one person is doing office work or work on this floor. A window glass portion B is provided to be incorporated into the building.

This window glass portion B is composed of a window glass, and the gap plate of the window glass is...

The radio wave shielding material body is formed as a glass surface layer, or the radio wave shielding material body is formed by mixing the glass material body.

The window glass section B of the building using such window glass allows sunlight to enter the building and blocks radio waves, so if it is necessary to exchange the outside air with the air inside the floor, generally Of course, it is necessary to have a structure in which the windows cannot be opened and closed, and to be equipped with a separate ventilation system. Recently, buildings are ventilated by keeping the windows closed.

Since it is normal to provide a sanitary environment for people, it is easy and not unnatural to open the windows only to let in sunlight, or to create a structure that does not allow sunlight to enter.
・.

The following glass plate bodies can be used as the window glass to which the present invention is applied.

When forming this glass plate for radio wave shielding, ultrafine tin oxide powder or transparent iron oxide ultrafine powder with a diameter of about 0.03 μm is used as a radio wave shielding material to coat the surface of the glass plate. If it is coated, it will be possible to obtain a fairly satisfactory transparency for letting in sunlight.

When using a glass with translucency comparable to that of frosted glass as the window glass, ultrafine powder with a diameter of about 10 times the diameter of the ultrafine powder may be adhered to or mixed with the surface of the glass plate (・.

In addition, a radio wave shielding paint, such as a nickel-acrylic paint, sprayed onto the surface of a glass plate can also be used as the window glass. The film thickness of this paint is 7
When the frequency is 1000 MHz at about 0 μ″m, the radio wave attenuation rate is about 25 dB or more, so the radio wave shielding effect is sufficient.

In Figure 1, 2 is the n number of fixed antennas (antennas for the central transmitting/receiving 11il control device) set on the ceiling of the floor, 2 is the central transmitting/receiving control device placed on each floor, and the device is wireless. It consists of a machine 4, an operation display section 5, and an exchange distribution connection circuit 6. In addition, 7 is a cable or optical fiber, 8 is an antenna for m terminal devices, 1 is a receiving terminal device, and 1 is a pager 9 shown in the figure.
1. Portable wireless telephone 92. In addition to radio 93 and television 94, cordless telephones (rotary dial, push button dial), cordless button telephones, facsimiles,
Also includes converter terminals, etc. Here, radio, television,
facsimile.

Confuc RA terminals, pagers, cordless telephones (cordless telephones, cordless button telephones), portable radio telephones, etc. can be moved and used within the floor.

These terminal devices are also installed on other floors. Communication within the building as referred to in the present invention includes calls and communications within the floor 1 and calls and communications outside the floor. First, regarding calls and communications within the floor 1, calls (Ca
ll) The received message passes through the terminal device antenna 8, is received by the central transmission and reception control device antenna 2, and is sent to the central transmission and reception control device.

The signal passes through the exchange/distribution connection circuit 6, is displayed on the operation display section 5, and simultaneously passes through the radio device 4, passes through the antenna 2, and is sent to the receiving terminal device #, thereby making it possible to make calls and communicate between the terminals through this route.

In addition, for communication with outside the floor, signals called from each terminal are routed to the central transmission/reception control unit through cables or original fibers.

It is transmitted to other floors, and calls and communications can be made in the same way as calls and communications within the same floor.

FIG. 2 is a configuration diagram showing another embodiment in which communication is performed between each floor in a building where the entire building is shielded from radio waves, and includes a transmitting antenna 11 installed outside the building.
The radio waves transmitted and received by the receiving antenna 11° are transmitted via the building central control relay device 10 to the IF-IF on the floor.
Each terminal 9--
Can communicate with 9o. BIF in the figure indicates the first basement floor. Symbols corresponding to FIG. 1 represent the same functions. Incidentally, it goes without saying that 111 and 112 may be used as transmitting and receiving antennas.

FIG. 3 is a schematic diagram showing another embodiment, in which there are a plurality of different radio wave shielding buildings and the spaces of all the buildings are used as a common space. In the same figure, 7
is a symbol corresponding to Figures 1 and 2, but cables (metal cables) are used to connect buildings in a common space.
Alternatively, optical fibers (or optical cables) 7 can be used to connect buildings.

Figure 4 is a diagram to explain the non-win communication system inside the radio wave shielding building, and 7 is the connection between the outside of the building and the 1) BX installed at the power station or other radio wave shielding building in Figure 3. It is a metal cable or original cable for use. Interface 12
．． 1 is used to connect the wireless devices 41 to 4n installed in the building with the radio wave leakage cable 13, thereby allowing communication and phone calls to be made with each of the terminals shown. The interface 12□ is the antenna 11. installed outside the building. and 112 and radio 4. -4n interface.

The radio waves used in each of the following examples are 3G radio waves outside the building.
Therefore, as long as the frequency and transmission power of the radio waves used are within a certain range, the frequency and transmission power can be set freely.

As is clear from the above-1-゛ description, one shot t'
As a result of the radio wave-shielding building's internal and external spaces being cut off, JL allows for free settings of the frequency and transmission power mentioned above, as well as the adoption of various modulation formats, eliminating the need for wiring to the brothels in each building. What's more, the end of the story (how many people are free to move freely on the floor according to the needs of their work). With the establishment of a successful transmission and reception system, wiring equipment and
The effects of lower construction costs and pickpockets are significant.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram that does not show an example of the 9-inventive system;
Both Figures 2 and 3 show other embodiments.
- Figure 4 is a diagram for explaining a wireless communication system in a radio wave shielded building. A...Radio wave shielding building, 1...One floor in building A consisting of an outer wall made of concrete material that shields radio waves,
B...Window glass part, 4 ・Wireless device (or Musouki),
Dan pager91. Mobile phone9. . Radio 946. A terminal device consisting of a television 94, etc. Patent applicant Japan Radio Co., Ltd.

Claims (1)

[Scope of Claims] A window glass portion of a building consisting of an external wall made of concrete material that shields radio waves may be a glass plate body formed with a radio wave shielding material body as a glass surface layer, or a glass material body with a radio wave shielding material body formed as a glass surface layer. By constructing a glass plate body made of mixed materials, a space is created within the building in which almost no radio waves enter from outside the building, and wireless equipment installed inside the building can be connected to the inside of the building. radio. △ Radio wave shielding in-building wireless communication system characterized by eliminating the leakage of radio waves to the outside of the building when communicating inside the building using televisions, pagers, cordless telephones, mobile radio telephones, etc. .