JPS62230230A - Radio communication system in intelligent - Google Patents

Abstract

PURPOSE:To attain the radio communication in a building with less number of channels by adopting the constitution that each floor is sectioned by using an electromagnetic shield and an operating frequency band is assigned to each floor so as to apply radio communication. CONSTITUTION:In an intelligent building whose outer wall face is covered by an electromagnetic shield layer, the electromagentic shield space is split into each floor. Then the operating frequency is assigned for every floor to apply radio communcation. Since the same operating frequency band for each floor is used, the utilizing efficiency of the frequency is improved. Further, if crosstalk takes place in using the same frequency band for adjacent floors, different frequency bands are used to avoid crosstalk.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wireless communication system in an intelligent building that has electromagnetic shielding performance suitable for adopting a network system using radio waves inside the building.

[Conventional technology]

Generally, in intelligent buildings, information and communications equipment such as complex electronic exchanges and computers are shared to communicate information within the building and with the outside world. The amount of information is increasing. Under such circumstances, the challenge for buildings in the future is how to provide necessary information more quickly and at a lower cost. In response to these challenges in intelligent buildings,
Information networks using data highway methods using optical fiber cables and coaxial cables are being considered.
Proposed.

[Problem that the invention seeks to solve]

However, with the data highway method that uses optical fiber cables and coaxial cables, optical fiber cables and coaxial cables must be stretched to every corner (terminal equipment) in an intelligent building, and cables must be laid in floor ducts and A heavy floor structure is required, and the construction cost and construction period cannot be ignored.

Furthermore, if radio waves are used for information communication, there will be no need to lay cables, but in this case, on the one hand, frequencies up to 50 GHz will be subject to regulations under the Radio Law because they emit noise radio waves to the outside, and on the other hand, A problem arises in that the system malfunctions due to external radio waves or the like.

Therefore, the applicant has made various proposals regarding an intelligent building that enables communication within the building using radio waves by making the entire building an electromagnetic shielding structure by using electromagnetic shielding materials in the frame and openings such as windows and doorways. Is going. However, when communicating using radio waves in such an intelligent building, if n channel frequency bands are assigned to each floor, a building with m floors will require n x m channel frequency bands. Therefore, if the frequency bandwidth of each channel is 25 kHz, the required frequency bandwidth when the entire building is made into one electromagnetic shield space is 25 kHz x n x rn. For this reason, as buildings become taller and the amount of traffic increases, the required frequency bandwidth (the number of channels required) becomes wider, and as a result, communication equipment becomes larger and equipment costs become more expensive. There's a problem.

The present invention solves the above problems and aims to provide a wireless communication system in an intelligent building that enables wireless communication within the building with a small number of channels.

[Means for solving problems]

To this end, the wireless communication method for intelligent buildings of the present invention is applicable to intelligent buildings in which the entire building has an electromagnetic shielding structure by using electromagnetic shielding materials in the frame and openings such as windows and doorways. The electromagnetic shielding space is divided into floors by partitioning, and a frequency band to be used is assigned to each floor to perform wireless communication using radio waves.

[Effect]

In the wireless communication system in an intelligent building of the present invention, the electromagnetic shielding space is divided into floors, so the same frequency band and the same communication equipment can be used on each floor. Therefore, wireless communication of many channels can be performed using a small number of channels for the building as a whole. Also, if interference occurs when the same frequency band is used on adjacent floors,
By using mutually different frequency bands, interference can be avoided and malfunctions caused by signals from adjacent floors can be prevented.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 is a diagram for explaining one embodiment of the wireless communication method in an intelligent building according to the present invention, and FIG. 2 is a diagram for explaining another embodiment of the wireless communication method in an intelligent building according to the present invention. It is.

The wireless communication method in an intelligent building according to the present invention further divides the electromagnetic shielding space of an intelligent building whose outer wall surface is covered with an electromagnetic shielding layer into each floor, and uses radio waves by assigning an arbitrary frequency band to each floor. FIG. 1 shows an example in which wireless communication is performed, and the frequency band to be used for each floor is the same frequency band (2).

In this case, if the number of channels on each floor is n and the frequency bandwidth of one channel is 25kHz, then 25kHz
Communication equipment for the Xn frequency band may be placed on each floor.

That is, in a building with m floors, it is sufficient to prepare m sets of the same communication equipment, so equipment costs can be reduced.

In the system shown in FIG. 1, if electromagnetic shielding is not sufficient between the upper and lower floors and there is radio wave leakage, the communication equipment will malfunction due to the radio waves leaked from the upper and lower floors. Therefore, as a modification of the present invention to solve such problems, FIG. 2 shows an example in which the frequency bands used are different from those of adjacent floors. In this example, 25kHz
Three types of frequency bands ■, ■, ■ with the frequency bandwidth of zXn
Set the frequency band and assign the frequency band to each floor in the order in which this is repeated. In this way, since the frequency band used is different from the floor immediately below and the floor immediately above, even if there is a slight leakage of radio waves between the floors above and below, there will be no interference and communication equipment will not malfunction. In this case, three types of communication equipment with a frequency band of 25 kHz x H may be prepared and arranged so that adjacent floors have different frequency bands.

Note that since different frequency bands are used for the upper and lower floors, basically two types of frequency bands may be alternately allocated to each floor.

Next, a specific example of an electric TiI shielding structure for dividing the electromagnetic shielding space in a building into each floor to enable wireless communication will be described.

FIG. 3 is a diagram showing an example of an electromagnetic shielding ceiling system, and FIG. 4 is a diagram showing the entire ceiling in which the entire ceiling has an electromagnetic shielding structure and an antenna is installed on the indoor side. In the figure, 1 is a field edge, 2 is a T-bar receiver, 3 is a special T-bar, 4 is a ceiling board, 5 is an electromagnetic shielding material, 6 is a lighting equipment, 7 is an antenna, 8 is a conductive material, 9 is an insulating material, 11 is the slab, 12 is the hanging bolt, 13
14 is a reinforcing bar, 14 is a frame, 15 is a crossover connection line, 16 is an air conditioning duct, and 17 is a filter.

In Fig. 3, the field edge 1 is suspended from the slab with hanging bolts, and the T-bar receiver 2 is attached to this field edge 1.
It is fixed to and supports the special T-bar 3. As shown in the figure, the special T par 3 supports a ceiling plate 4, a lighting fixture 6, etc., and also allows an antenna 7 for wireless communication to be installed inside the room. By incorporating the antenna 7 into the indoor side using this special T-bar 3, and configuring the ceiling with the ceiling plate 4 and lighting equipment 6, etc., which have electromagnetic shielding performance,
The electromagnetic shielded space can be divided into floors for wireless communication. An electromagnetic shielding material 5 such as a conductive film is applied to the ceiling plate 4, and the joints formed by the special T-bars 3 are electrically connected to each other using a conductive material 8. Further, the antenna 7 may be installed while being insulated from the special T-bar 3 using an insulating material 9. In addition, as the antenna 7,
Leaky coaxial cables, waveguides, etc. can be used.

FIG. 4 shows the entire ceiling in which the antenna is installed on the indoor side using the electromagnetic shielding structure as described above. In FIG. 4, a louver having electromagnetic shielding performance is used for the lighting fixture 6, and a mesh filter 17 is fitted into the opening of the air conditioning duct 16. Then, by electrically connecting the louver and the special T-bar 3 with the connecting wire 15, it is integrated with the ceiling plate 4, or by connecting the special T-bar 3 and the filter 17 with a conductive material or direct contact. By electrically connecting and integrating them and grounding them through the reinforcing bars 13, electromagnetic shielding performance can be ensured over the entire ceiling surface. As a result, the room is shielded from, for example, a ballast for lighting equipment or other power equipment placed under the ceiling, and malfunctions of communication equipment in the room due to these noises can be prevented.

The antenna built into the ceiling as described above can also be used for wireless communication between communication devices installed on each floor by connecting it to a coaxial cable via a branch. This coaxial cable can be used for common television viewing, which is permanently installed through a pipe shaft (EPS). A public listening antenna is connected to this coaxial cable at the head end.
A television receiver or the like is connected through the branch, and the signal received from the public antenna is distributed from the branch through the head end and coaxial cable.

Note that the branching device connected to the coaxial cable for common television viewing has reverse coupling loss in order to reduce mutual interference between devices. That is, although signals flow between the head end and each device, it is difficult for signals to flow between each device due to reverse coupling loss. This reverse coupling loss is usually designed for FM and television frequency bands of ljOMHz or higher for television listening, and is effective for high frequencies of 10MHz or higher.

Therefore, when communicating in a frequency band other than the FM or TV frequency band of this coaxial cable, there is a frequency band where reverse coupling loss is effective, that is, a high frequency band of 10 MHz or more, and a frequency band where reverse coupling loss is not effective, that is, a few MHz or less. There will be a low frequency band of .

Therefore, when using the former high frequency band, it is necessary to provide a repeater at the head end and to transmit information between communication control devices via this repeater. In other words, if the transmission signal from the communication control device is the upstream signal and the received signal is the downstream signal, one transmission line is changed to the upstream and downstream carrier frequencies, and the repeater transfers the upstream signal to the downstream signal, thereby transmitting the signal between the communication control devices. Make sure to communicate.

In addition, when using the latter low frequency band, a repeater is not necessary, but in order to avoid having a negative effect on FM broadcasting and TV broadcasting, the baseband frequency band
S K (frequency 5hift keyi)
ng) method to perform signal transmission between communication control devices. In other words, when information is transmitted via a coaxial cable for shared television viewing using pulse signals of "1" and "0", the pulse signal contains high frequency components, so
This has a negative effect on FM broadcasting and television broadcasting, but in the baseband FSK method, frequency deviation (FS) occurs in a frequency band of several MHz or less in response to information "1" and "0".
Therefore, high frequency components that adversely affect FM and television are not included.

Figure 5 is a diagram showing an example of an assembled board used to provide electromagnetic shielding performance to the ceiling and floor surfaces, 21 and 24 are finishing materials, 22 is a shielding material, 23. 25 and 26 are conductive materials. showing a sexual film.

The assembly board shown in FIG. 5 is made up of a finishing material 21 and a shielding material 22 of the same size, and these
They are made by shifting them in one direction and stacking them on top of the other. When arranging them to create a non-ceilinged surface or a floor surface, the portion of the finishing material 21 that does not overlap will be connected to the shielding material 22 of the adjacent assembly board, and the portion of the shielding material 22 that will not overlap will be connected to the adjacent assembly board. The finishing material 21 of the assembly board to be assembled and the finishing material 21 are overlapped and arranged. When arranging the assembly boards in this way, if a gap is created between the shielding materials of adjacent assembly boards, radio waves will leak from there. Electromagnetic shielding performance is ensured by pasting a conductive film 23 on the surface in contact with 22.

Also, in place of the shielding material 22 shown in FIG. 5(b), the shielding material 22 shown in FIG.
As shown in C1, a finishing material 25 similar to the finishing material 21 and other members are used, and a conductive film 2 is placed on the overlapping surface.
5 may be pasted. Furthermore, for convenience, the conductive film 26 may be attached only to the portion of the finishing material 21 that does not overlap with the shielding material 22, as shown in FIG. 5 (di).

Note that the present invention can be modified in various ways and is not limited to the above embodiments. For example, the electromagnetic shielding structure between each floor is not limited to the structure described above, and other structures may be adopted.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, since the electromagnetic shielding space is divided and configured for each floor, it is possible to independently select a frequency band for each floor, and for the entire building, regardless of the number of floors. Communication equipment with the necessary frequency bandwidth can be provided for each floor. Moreover, since the same frequency band can be used on each floor, each floor can use the same specifications or a limited number of communication equipment, allowing for standardization of communication equipment.
Equipment costs can be reduced. −

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining one embodiment of the wireless communication method in an intelligent building according to the present invention, and FIG. 2 is a diagram for explaining another embodiment of the wireless communication method in an intelligent building according to the present invention. , Figure 3 is a diagram showing an example of an electromagnetic shielding ceiling system, Figure 4 is a diagram showing the entire ceiling with an electromagnetic shielding structure and an antenna is installed on the indoor side, and Figure 5 is a diagram showing the ceiling surface and floor. It is a figure which shows the example of the assembly board used for giving electromagnetic shielding performance to a surface. 1... Wild edge, 2... T-bar receiver, 3... Special T-bar, 4... Ceiling board, 5... Electromagnetic shielding material, 6... Lighting equipment, 7... Antenna , 8... conductive material, 9...
Insulating material, 11... Slab, 12... Hanging bolt, 1
3...Reinforcement bar, 14...Structure, 15...Cover connection wire, 16...Duct, 17...Filter, 21 and 2
4... Finishing material, 22... Shielding material, 23.25 and 2
6... Conductive film. Applicant Shimizu Corporation Representative Patent Attorney Ryukichi Abe (2 others) Figure 1 Figure 2 Figure 11

Claims (2)

[Claims] (1) In an intelligent building where the entire building has an electromagnetic shielding structure by using electromagnetic shielding materials in the frame and openings such as windows and doorways, electromagnetic shielding spaces can be created on each floor by partitioning each floor using electromagnetic shielding materials. A wireless communication system for intelligent buildings, which is characterized by dividing the building and allocating a frequency band for each floor to perform wireless communication using radio waves. (2) The wireless communication system in an intelligent building according to claim 1, characterized in that different frequency bands are used on adjacent floors.