JPS6282841A - Multiple dwelling house provided with information communication system - Google Patents

Abstract

PURPOSE:To attain efficient and rapid information communication through the small number of communication lines by using a coaxial cable for community receiving and using frequency bands other than TV frequency bands as communication lines for information communications. CONSTITUTION:In the information system for executing information communication among terminals 7 of respective houses and a central control station 1, the coaxial cable for community receiving is connected to a control room or respective houses through branch units 4, 5. A common antenna is connected to a head end 3 and a receiving signal from the common antenna is distributed to respective terminals 7 through an end 3 and the coaxial cable. The frequency bands other than the TV frequency bands are used as communication lines for information communication through the coaxial cable. When a communication line is idle for a communication request, transmission can be attained under the condition that the communication line is not busy after waiting only the guard time inherent on each station, so that efficient and rapid information communication can be attained through the small number of communication lines.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a housing complex that is equipped with an information communication system between a central control station installed in a management room or other shared facility and terminals in each dwelling unit. It is.

[Conventional technology]

In housing complexes consisting of many units, there are intercoms at the entrance of the complex, call lines and control lines for calls between each unit and the manager and each unit, coaxial cables for common television viewing, and fire and crime prevention. Information and communication lines, such as reporting lines, are required between administrative access and shared equipment and each dwelling unit. Traditionally, these are each connected using separate cables. For example, for the control line for communication between the intercom at the collective entrance and each dwelling unit, a system is adopted in which a plurality of lines are used and each dwelling unit is selected by a combination of signals from each line.

[Problem that the invention seeks to solve]

By the way, in apartment complexes, with the progress of the information age, it has become necessary to develop a variety of services based on information and communication in addition to the above-mentioned information and communication. but,
In the conventional system, separate communication lines are installed for each system, resulting in poor scalability. In addition, the installation of communication lines is redundant, which poses many problems in terms of cost.

The present invention solves the above-mentioned problems, and aims to provide an apartment complex equipped with an information communication system that enables efficient (high-speed) information communication with fewer communication lines.

[Means for solving problems]

To this end, an apartment complex equipped with the information communication system of the present invention is an apartment complex equipped with an information communication system that performs information communication between the terminals of each dwelling unit and a central control station. A common communication line using a frequency band other than the TV frequency band using a coaxial cable for common TV listening is established between the stations, and when the communication line is free in response to a communication request, only the guard time unique to each station is used. The system is characterized in that it waits, and then, on condition that the communication line is not busy, acquires a communication line and starts transmission.

[Effect]

In an apartment complex equipped with the information communication system of the present invention, a coaxial cable for common television viewing, which is normally installed in apartment complexes, is used as a communication line, so there is no need to install a communication line. Furthermore, since each station acquires a communication line with its own guard time, it is possible to avoid confusion caused by each station acquiring a communication line at the same time in response to a communication request.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 is a diagram for explaining an embodiment of an apartment complex equipped with the information communication system of the present invention, FIG. 2 is a diagram for explaining a transmission procedure, and FIG. 3 is a diagram for explaining a reception procedure. figure,
FIG. 4 is a time chart for explaining communication timing. In the figure, 1 is a central control station, 2 and 6 are communication control units, 3 is a head end, 4 and 5 are branchers, 7 is a residential unit terminal, and 8 is a coaxial cable.

In FIG. 1, a coaxial cable 8 is a coaxial cable for common television viewing that is permanently installed in an apartment complex.
A public antenna (not shown) is connected to the end 3, and connected to the management room and each dwelling unit via a branch 4.5. Then, the received signal from the public antenna is distributed to each dwelling unit via the head end 3 and the coaxial cable 8 from the branch 4.5.

In the example shown in FIG. 1, the coaxial cable 8 for common television viewing is used to communicate information using a frequency range other than the television frequency range as a communication line, and therefore each branch 4.
Communication control units 2 and 6 are connected to 5. The central control station 1 and the communication control section 2 are installed in a management room or a common equipment room and constitute a master station, and the communication control section 6 and the dwelling unit terminal 7 are installed in each dwelling unit and constitute a slave station.

The present invention utilizes the system configuration described above to enable CS
M A (Carrier 5ense Mult
iple Access) This system uses the guard time method to communicate information. In this C3MA guard time method, the line monitoring control unit monitors the usage status of the communication line, and when the line becomes empty, it waits for a guard time period unique to each station before starting transmission.This guard time is fixed. There are two methods: one that determines the number, and one that generates random numbers each time. Figures 2 and 3 below
The transmission/reception procedure will be explained with reference to the figure.

First, in the transmission procedure, as shown in FIG. 2, when the communication line is free for a transmission request, (1) the line monitoring control section waits for a guard time, and then performs the process (2).

■ Determine whether a communication line is in use. YES(Bu
sy), the process ``■'' is performed, and in the case ``No'', the process ``■'' is performed.

■ Check whether the communication line has been released. NO(B
usy), wait until the status becomes YFF, S (Ready), and if YES, return to the process of (2). Just wait for guard time again.

■ Secure the communication line (make it busy). Next ■
Process.

■Here, the data transmission/reception unit sends out a transmission frame.

Next, perform the process (■).

■ The line monitoring control unit opens the communication line (Rea
(return to dy). Next, perform the process (■).

■ The communication controller uses acknowledge frames (AC
Check whether a K frame) has been sent. In the case of YES, the transmission is terminated, and in the case of No, the process of (2) is performed.

■ Next, check whether a certain period of time has passed after the communication line was opened. In the case of YES, the process ``■'' is performed, and in the case of No, the process returns to the process ``■''.

■ Perform error processing (timeout processing) and end the transmission.

In contrast to the above transmission procedure, the reception procedure is as shown in FIG. 3: (1) The data transmission/reception unit receives the transmission frame. Next, 0 processing is performed.

■ The line monitoring control unit immediately secures the communication line (
Set it to Busy). Next, 0 processing is performed.

0 The data transmitting/receiving unit sends an acknowledge frame (ACK frame) to the transmitting station. Next, process the [phase].

■ The line monitoring and control unit opens the communication line.
Return to y) to end the reception.

FIG. 4 shows a time chart of communication timing corresponding to the above procedure. In addition, guard time W is
It is set uniquely for each station according to the following 2.

W = (transmission delay time) + (reception overhead) + (receiving station specific waiting time) The above situation! An example of a transmission control procedure that can be applied to 4 communications is a high-level data link control procedure (HDLC procedure; high-1 level data 1 ink co.
control procedures). Figure 5 shows H
FIG. 2 is a diagram showing a frame structure of a DLC procedure. HDLC
The procedure proceeds in such a way that the master station responsible for controlling the data link transmits a command frame, and the slave station (residential unit) that receives the control transmits a response. Each station has an address, and the address of the other station is displayed in the address section A of the command frame, and the address of the own station is displayed in the address section A of the response frame. The type of command/response is indicated by a combination of bits in the control section C. F is a flag sequence,
It is used as a frame start and end signal, and as a signal for frame synchronization between transmitting and receiving. (2) is an information part, and S is a frame check sequence.

FIG. 6 is a diagram for explaining an example in which the information communication system according to the present invention is applied to an intercom.
12 is a master station, 13 is a slave station, and 15 is a filter. In the example shown in FIG. 6, a coaxial cable for common television viewing is used as a communication line in a frequency range other than the television frequency range, as described above. Further, a filter 15 is connected between the coaxial cable and the intercom 14. And intercom 1 installed at the collective entrance
1 to I-5, when a call request is made to the intercom 14, the master station 12 sends a message to the terminal 13 of the corresponding dwelling unit.
Sends control signals for connection to the call line. The terminal 13 is
This control signal controls the filter 15 to connect the call line, and when the call ends (the intercom hooks up), the filter 15 is controlled again to cut off the call line.

By the way, in FIG. 1, the branch 4.5 connected to the coaxial cable 8 has a reverse coupling loss in order to reduce mutual interference between devices. That is, a signal flows between the head end 3 and the communication control section 2, and between the head end 3 and the communication control section 6, but the signal flows from the communication control section 2 side to the communication control section 3 side, or from the communication control section 2 side to the communication control section 3 side. The flow from the 6 side to the communication control unit 2 side is difficult. This reverse coupling loss is usually designed for FM and TV frequency bands of 80 MHz or higher for television listening, and is effective for high frequencies of 10 MHz or higher.

Therefore, when using a frequency band other than the FM and TV frequency bands of this coaxial cable 8 as a communication line, it is necessary to use 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 high frequency band of 10 MHz or more. Several MH
There is a low frequency band below z. Therefore, when using the former high frequency band, a repeater is installed at the head end 3, and communication between stations is performed by changing the upstream and downstream carrier frequencies and switching upstream and downstream carrier frequencies using the repeater. Do it like this. In addition, when using the low frequency band of the rear yellow, the baseband F S K (fr
By employing the 5-hift keying method to perform direct communication between the communication control unit 2 side and the communication control unit 6 side, it is possible to prevent an adverse effect on FM broadcasting and television broadcasting.

In other words, when information is transmitted using the coaxial cable 8 for common television viewing using pulse signals of "1" and "0", the pulse signal contains high frequency components, which has an adverse effect on FM broadcasting and television broadcasting. gives the baseband FS
In the K method, the frequency of several MHz corresponds to the information "1" and "0".
Frequency shift (FS) occurs in the following frequency bands, so FM
It does not contain high frequency components that may have a negative effect on TVs.

Note that the present invention can be modified in various ways and is not limited to the above embodiments. As described above, the system is not limited to the method of using a coaxial cable for common television viewing, but it is also possible to share a cable used elsewhere and use a frequency band that does not overlap with other systems as a communication line. Furthermore, other transmission control procedures may be adopted instead of the HDLC procedure.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, by using a frequency band other than the television frequency band as a communication line, a coaxial cable for TV shared viewing can be used, and a communication line etc. in an apartment complex can be used. Reducing equipment costs,
The reliability of the communication system can be improved. In addition, by transmitting signals using broadband FSK in a low frequency band, it is possible to provide a system that is not affected by reverse coupling loss in branchers (and does not require repeaters or FM modulation stages. By simply connecting terminals for various services to the communication control unit, it is easy to add and expand services that require information transmission, and it is also possible to receive communication requests at high speed. It can also be applied to apartment complexes with

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining an embodiment of an apartment complex equipped with an information communication system of the present invention, FIG. 2 is a diagram for explaining a transmission procedure, and FIG. 3 is a diagram for explaining a reception procedure. , FIG. 4 is a time chart for explaining communication timing, FIG. 5 is a diagram showing the frame structure of the HDLC procedure, and FIG. 6 is an example of the case where the information communication method according to the present invention is applied to an intercom. 1... Central control station, 2 and 6... Communication control unit, 3...
・Head end, 4 and 5...branch, 7...residential unit terminal, 8...coaxial cable, 11 and 14...intercom, 12...master station, 13...slave station, 15...
filter.

Claims (3)

[Claims] (1) A housing complex equipped with an information communication system that communicates information between terminals in each dwelling unit and a central control station, where a coaxial cable for common television viewing is connected between the terminals in each dwelling unit and the central control station. A common communication line is established using a frequency band other than the television frequency band using
An apartment complex equipped with an information communication system characterized in that, after an appropriate time, a communication line is acquired and transmission is started on the condition that the communication line is not busy. (2) An apartment complex equipped with the information communication system according to claim 1, characterized in that information communication is performed using a frequency-shifted signal in a frequency band lower than the television frequency band. (3) A repeater is installed at the head end of the coaxial cable, and the repeater transfers the upstream signal to the downstream signal using a high frequency band near the television frequency band, and communicates information between the terminals in each residential unit and the central control station. An apartment complex equipped with the information communication system according to claim 1.