JPH0824387B2 - Wireless system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used to control a transmitter in a wireless system, and particularly, as in a paging system (radio call system), the same signal is simultaneously transmitted from a plurality of transmitters. A wireless system for transmitting.

〔Overview〕

The present invention relates to a wireless system in which a signal sent from a central control unit is simultaneously transmitted from a plurality of transmitters, in which the transmitter is turned on (turned on) and output is turned off (turned off).
It is possible to check individual transmitters without interrupting service by controlling the transmission in accordance with three predetermined operation modes.

[Conventional technology]

Conventionally, in a system such as a paging system where the service is wide and where the subscriber is not known, a method of simultaneous transmission by a plurality of transmitters is used, and the transmitters are always transmitted or intermittent only when necessary. The transmission was controlled by either method.

[Problems to be solved by the invention]

In the wireless system described above, the installation of each transmitter is usually
The radio wave propagation areas are overlapped so that there are no holes in the service area. for that reason,
When expanding the service area, it is necessary to perform sufficient checks to prevent the transmitter from adversely affecting other transmitters when the transmitter to be added starts up. There was a problem of starting up after checking the operation of the machine. Also, how much service area each transmitter has is, for example,
When a station becomes inoperable, it is very important to know how much it can be covered by other stations. However, measuring the coverage area of each transmitter during operation is a multi-station. The object of the present invention, which was a very difficult problem due to the nature of the simultaneous transmission system, is to solve the problems described above, so that individual transmitters can be checked without interrupting the service. It is to provide a wireless system that can be operated easily and reliably.

[Means for solving problems]

The present invention provides a wireless system comprising a central control device and a plurality of transmitters for simultaneously transmitting signals sent from the central control device, wherein the central control device transmits communication signals to all transmitters. An output control signal sending means for sending an output closing signal for instructing an output closing before sending and an output disconnection signal for sending an output interruption after sending a communication signal, and the transmitter including an identification code for each transmitter Operation mode signal transmitting means for transmitting a first, second or third mode signal that defines an operation mode, each transmitter has an individual identification code, and the first mode that matches the self identification code When a signal is detected, the transmitter output is turned on by the output turn-on signal and the transmitter output is turned off by the output cutoff signal, the first operation mode is entered, and the second mode signal matching the self-identification code is detected. When the second operation mode in which the transmitter output is turned off by the output closing signal and the transmitter output is turned on by the output cutting off signal is entered, and the third mode signal matching the self-identification code is detected, the output closing signal and It is characterized by comprising transmitter control means for controlling to enter a third operation mode in which the transmitter output is always turned on regardless of the output cutoff signal.

Further, in the present invention, the transmitter control means may include operation mode control means capable of locally entering the first, second or third operation mode in each transmitter.

Further, according to the present invention, the transmitter control means sends an operation mode informing means to the central control unit, which sends a status signal indicating which one of the first, second and third operation modes is in each transmitter. Can be included.

[Action]

In each transmitter, when the transmission control means detects the first mode signal addressed to the own transmitter sent from the central control device, the output is turned on and output by the output input signal from the central control device. When the second operation signal is detected by entering the first operation mode in which the output is cut off (OFF) by the disconnection signal, the operation is switched to the second operation mode in which the output is supplied by the output disconnection signal and the output is disconnected by the output supply signal. When the third mode signal is detected and the third mode signal is detected, the third operation mode is entered in which the output is always supplied regardless of the output input signal and the output disconnection signal.

Therefore, the check can be performed by operating the transmitters to be checked in the second or third operation mode without stopping the services of all the transmitters.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing an example of a transmitter control device thereof, and FIG. 3 is an explanatory diagram showing an example of an output input signal thereof. The figure is an explanatory view showing an example of the output disconnection signal, and FIGS. 5 (a), (b) and (c) are explanatory views showing an example of the first, second and third mode signals, respectively.

According to FIG. 1, the present embodiment is a wireless system provided with a central control unit 1 and four transmitters 3a to 3e for simultaneously transmitting signals sent from the central control unit 1. The characteristic feature of the central control unit 1 is to send out an output closing signal ON 'for instructing all transmitters 3a to 3e to turn on the output before sending the communication signal, and to turn off the output after sending the communication signal. an output control signal sending means 1a for transmitting an output disconnection signal OFF ', the first, second or third mode signal C _1, C ₂ or defining the operating mode of the transmitter includes an identification code for individual transmitter With the operation mode signal sending means 1b for sending C ₃ , each transmitter 3a ~ 3e has an individual identification code, the output input signal when the first mode signal C ₁ matching the self identification code is detected Turn ON the transmitter output and turn OFF the output signal to turn the transmitter Enters the first operation mode for the output to cross, the transmitter output by the own identification code and the output on signal ON when detecting said second mode signal C ₂ that match 'by the cross-sectional transmitter output Output disconnection signal OFF' It enters the second operation mode to inject, upon detection of a third mode signal C ₃ to match with the own ID code, always transmitter output to the closing state regardless of the output on signal oN 'and the output disconnection signal OFF' Transmitter control devices 2a to 2e are provided as transmitter control means for controlling to enter the third operation mode.

Then, according to FIG. 2, the transmitter control devices 2a to 2e are
Demodulator (DMD) 201 for converting the modem signal from the central controller 1 input to the input terminal 217 into a baseband signal
And a modulator (MD) 202 that converts a signal to the central control unit 1 into a modem signal and outputs it to an output terminal 218, and outputs the data by adjusting the input of the transmitter and the interface by absorbing the jitter of the baseband signal. An output interface circuit (OIO) 203 to be sent to a transmitter via a terminal 219, a central processing unit (CPU) 206 for controlling the whole, and a serial signal string from the demodulator 201 are converted into parallel to 8 bits and then centralized. A serial interface circuit (SIO) 204 input to the processing unit 206, a serial interface circuit (SIO) 205 for converting an 8-bit parallel signal from the central processing unit 206 into a serial signal, and a central processing unit
Parallel interface circuit (PIO) 2 that sends output control signals via output terminal 220 for output control of 206 and transmitter
07 and the switch 213 for setting the identification number
, A parallel interface circuit (PIO) 208 for controlling between the central processing unit 206 and the switch 213, a display diode 209 for displaying the on / off state of the output of the transmitter, the first operation mode and the second operation mode, respectively. Includes display diodes 210, 211 and 212 for indicating the operating mode and the third operating mode.

According to FIG. 3, the output closing signal ON 'is composed of an 8-bit preamble "101010" and a closing signal ON 24bit x 6 words, and the beginning of each closing signal ON is an 8-bit synchronization signal "01010010". , The leading 2 of the following 8 bits
Bit "11" means output input control, and the fifth bit "0" indicates that all transmitters are designated. When the transmitter control devices 2a to 2e continuously detect the 24-bit closing signal ON twice, the transmitter controlling devices 2a to 2e judge that the output closing signal is ON '.

According to FIG. 4, the output disconnection signal OFF ′ is composed of disconnection signal OFF 32 bits × 6 words. The beginning of each OFF signal OFF is the 8-bit synchronization signal “01010010”, and the following 2 bits of the beginning 2 Bit "01" means output cutoff control, and the fifth bit "0" indicates that all transmitters are designated. Note that the OFF signal OFF is 32 bits because, for example, when the POCSAG signal is transmitted as a paging signal, the codeword to be configured is a 32-bit BCH code, and the OFF signal OFF is used in this POCSAG. This is because one incorrect 2-bit SC signal is used to prevent malfunction. When the transmitter control devices 2a to 2e continuously detect this OFF signal OFF twice, the output disconnection signal OFF '
Judge.

According to FIG. 5 (a), the first mode signal C ₁ is composed of an 8-bit preamble “10101010” and a C-1 signal 24 bits × 6 indicating the first mode. The first 8 bits are the synchronization signal “01010010”, and the first 2 bits “00” of the following 8 bits mean the mode selection,
The fifth bit "1" means individual designation of the transmitter, and the subsequent 6 bits and 7 bits "00" mean the first operation mode.
Then, 1 bit to 7 bits of the last 8 bits mean the identification number of the transmitter control devices 2a to 2e, and the central processing unit 206 of the transmitter control devices 2a to 2e is configured by the number setting switch 2
This signal is valid only when the value of 13 and this identification number match. The last "P" of the 8th bit is a parity bit, which is an odd parity for 1 to 7 bits. The transmitter control devices 2a to 2e detect the C-1 signal with the same identification number twice in succession, and then the first mode signal
Judge as C ₁ .

Similarly, according to FIG. 5 (b) and FIG. 5 (c),
The second mode signal C ₂ and the third mode signal C ₃ have exactly the same configuration as the first mode signal C _1, and in the case of the C-2 signal indicating the second mode, the second 8 bits of 6 bits, 7
In the case of the C-3 signal indicating that the bit is “01” and indicates the second operation mode and the third mode, the second 8-bit 6 bits and the 7-bit “10” indicate the third operation mode. Only the place is different.

Next, the operation of this embodiment will be described with reference to FIG.

FIG. 6 is a timing chart showing the operation of the embodiment,
It shows how to enter the first, second and third, and the transmitter output on / off control method in each operation mode.

In FIG. 6, (1) is a signal train output from the central control unit 1 to each of the transmitters 2a to 2e, which is actually modulated into a modem signal for long-distance transmission. And
(2a) to (2e) respectively represent the output on / off signals of the transmitter control devices 2a to 2e, where the "H" record indicates the output on and the "L" level indicates the output off.

The part on the left side of FIG. 6 is when all the transmitter control devices 2a to 2e are in the first operation mode.
When 3a to 3e receive the output turn-on signal ON ', they turn on the output and transmit the paging signal. The output is cut off when the output cutoff signal OFF 'is received. Here, the first trust mode is a normal operation state.

Next, it is assumed that the second mode signal C ₂ for the transmitter control device 2d is sent from the central control device 1 (FIG. 6, central part).
Then, only the transmitter control device 2d enters the second operation mode, and thereafter, the transmitter 3d is turned off by the output turn-on signal ON 'and turned on by the output cut-off signal OFF'. This second operation mode does not affect other transmitters and is therefore effective for checking before starting operation, such as when adding transmitters.

Next, the third mode signal C ₃ for the transmitter control circuit 2e central control unit 1 is sent (portion of Fig. 3 right).
Then, only the transmitter control circuit 2e enters the third operation mode, and thereafter, the transmitter 3e is always turned on regardless of the output turn-on signal ON 'and the output cut-off signal OFF'. This third operation mode is effective when measuring the service area of only that station during operation.

FIG. 7 is a block diagram showing another example of the transmitter control device according to the present invention. In the transmitter control devices 2a to 2e shown in FIG. 2, as a feature of the present invention, a switch 214 for setting the own station mode is provided. , 215 and 216 are provided.

Here, the switches 214, 215 and 216 are switches that can locally set the transmitter to the first, second and third operation modes, respectively.

That is, in this case, there is an advantage that the transmitter can be locally set to an arbitrary operation mode as needed, without depending on the control signal from the central controller 1, as necessary.

FIG. 8 is a block diagram showing another example of the transmitter control device according to the present invention. In the transmitter control devices 2a to 2e shown in FIG. 7, as a feature of the present invention, in each transmitter, The central processing unit 206 is provided with an operation mode informing means 206a for transmitting to the central control unit 1 a status signal indicating which of the first, second and third operational modes it is in.
It is provided inside.

The status signal is a signal indicating which one of the display diodes 210, 111 and 212 is lit in the operation mode of the transmitter. The status signal passes from the central processing unit 206 through the serial interface circuit 205 and the modem signal at the modulator 202. And is sent to the central control unit 1 via the output terminal 219.

That is, in this case, the central control unit 1 controls each transmitter
There is an advantage that the actual operation modes of 3a to 3e can be monitored, and more reliable system operation can be performed.

〔The invention's effect〕

As described above, the present invention is
By having three operation modes, the second and third operation modes, it is possible to check individual transmitters without interrupting service, and there is an effect that system operation can be performed easily and reliably.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a block diagram showing an example of the transmitter control device. FIG. 3 is an explanatory diagram showing an example of the output input signal. FIG. 4 is an explanatory view showing an example of the output disconnection signal. 5 (a), (b) and (c) are explanatory views showing examples of first, second and third mode signals, respectively. FIG. 6 is a timing chart showing the operation. FIG. 7 is a block diagram showing another example of the transmitter control device. FIG. 8 is a block diagram showing another example of the transmitter control device. 1 ... Central control unit, 1a ... Output control signal sending means, 1b
...... Operation mode signal sending means, 2a to 2e ...... Transmitter control device, 3a to 3e ...... Transmitter, 201 ...... Demodulator (DMD), 202 ...
… Modulator (MD), 203 …… Output interface circuit (OI
O), 204, 205 ... Serial interface circuit (SIO), 20
6 ... Central processing unit (CPU), 206a ... Operation mode notification means, 207, 208 ... Parallel interface circuit (PIO), 20
9, 210, 211, 212 …… Display diode, 213-216 …… Switch, 217 …… Input terminal, 218,219,220 …… Output terminal, C ₁ …… First mode signal, C ₂ …… Second Mode signal, C ₃
…… Third mode signal, OFF …… disconnect signal, OFF ′ …… output disconnection signal, ON …… make signal, ON´ …… output make signal.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04Q 7/06 H04B 7/26 K

Claims (3)

[Claims] 1. A wireless system comprising a central control device and a plurality of transmitters for simultaneously transmitting signals sent from the central control device, wherein the central control device has communication signals for all transmitters. And an output control signal sending means for sending an output closing signal for instructing an output closing before sending a communication signal and for sending an output disconnection signal for instructing an output disconnection after sending a communication signal, and the transmitter including an identification code for an individual transmitter. Operation mode signal transmitting means for transmitting a first, second or third mode signal that defines the operation mode of each of the transmitters, and each transmitter has an individual identification code When a mode signal is detected, the first input mode is entered in which the transmitter output is turned on by the output turn-on signal and the transmitter output is turned off by the output cutoff signal, and the second mode signal that matches the self-identification code is detected. When the second operation mode in which the transmitter output is turned off by the output turn-on signal and the transmitter output is turned on by the output turn-off signal is entered, and the third mode signal that matches the self-identification code is detected, the output turn-on signal And a transmitter control means for controlling to enter into a third operation mode in which the transmitter output is always turned on regardless of the output cutoff signal. 2. The radio system according to claim 1, wherein said transmitter control means includes operation mode control means capable of locally entering said first, second or third operation mode in each transmitter. 3. The operation mode informing means for transmitting the status signal to the central control unit, wherein the transmitter control means sends a status signal indicating whether the transmitter is in the first, second or third operation mode. Claim 1 or Claim 2 including
The described wireless system.