JPH03266533A - Transmitter for radio call system - Google Patents

Abstract

PURPOSE:To prevent the reduction in the service to a call receiver by selecting a standby system and energizing transmission power of a new act system when a transmission power ON notice from an act system transmitter is not received within a predetermined time. CONSTITUTION:Transmission power ON notice monitor sections 5 and 5a are connected back to back between an act system transmitter 101 and a standby system transmitter 102 and they inform the ON/OFF state of their own systems to each other. When the transmission power ON notice monitor section 5 receives a transmission power ON notice of the other system before a predetermined time, a command of a succeeding transmitter control signal is awaited. If the transmission power ON notice is not received within a predetermined time, a CPU 3 gives a command of act/standby switching command to an act notice monitor section 4 to switch the system and confirms it that its own system is an act system thereby energizing the transmission power of the transmission section 8 of its own system. Thus, the deterioration in the call service is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wireless paging system, and more particularly to a transmitter with a duplex configuration having a broadcast switching control function.

[Conventional technology]

A conventional radio paging transmitter will be described with reference to the drawings.

FIGS. 2(a) to 2(d) are examples of master station transmission signals sent from the master station to the transmitter in the wireless paging system, and FIG. 4 is a block diagram of an embodiment of a conventional transmitter with a duplex configuration. .

In the radio paging system, while broadcasting a paging signal, a transmitter control signal is sent from the master station to the transmitter to turn on the transmission power of the transmitter of the radio paging system. Figure 2 (
a) shows a transmitter control signal and a calling signal consisting of a transmission power on instruction signal, a dummy signal, and a transmission power off instruction signal sent from the master station. Transmitter control signals are generally placed before and after the ringing signal. Figure 2 (b) - (
d) is a 16-byte transmission power on instruction signal to turn on the transmitter's transmission power, a 10-byte dummy signal to make effective use of the battery saving function of the calling receiver, and a transmitter's dummy signal. The details of a 32-byte transmission power off instruction signal for turning off transmission power are shown.

In FIG. 4, 401 is an act transmitter, and 402 is a standby transmitter, each of which has the same configuration and has the same functions and performance. A duplex configuration is adopted, and if a failure occurs in one of the transmitters, the system switches to the other transmitter to prevent service from deteriorating. When receiving a transmitter control signal sent from a master station and instructing to turn on transmission power, control is performed so that only one of the systems transmits transmission power. The system that sends out transmission power according to the transmitter control signal is called the act system, and the paired system is called the standby system.

Hereinafter, the operations of the components with the corresponding numerical codes of the act system components 1 to 8 and the standby system components 1a to 8a are the same, so unless there is a particular distinction, the act system 4
1 will be used as a representative for explanation.

Act system transmitter 401. The standby transmitter 402 receives a master station transmission signal from the master station through different connection lines. The demodulator 1 of the act transmitter 401 demodulates the master station transmission signal into serial data. The demodulated serial data is converted into parallel data by an S/P converter (serial/parallel converter) 2.

The CPU (control unit) 3 analyzes the transmitter control signal from the master station transmission signal converted into parallel data, and controls the on/off of the transmission power of the transmitter 8. If the instruction is to turn on the transmission power of the transmitting section 8, then whether the own system is an active system or a standby system is read from the act report monitoring section 4. If the own system is an active system, ON control is performed through the transmission power on instruction confirming unit 6 so that the transmission power of the transmitting unit 8 of the own system is turned on.

The CPU 3 also reports the act or standby status of its own system to the standby system transmitter 4 through the act reporting monitoring section 4.
Act/standby is switched based on the information sent to 02 and read by the act notification monitoring unit 4 as to the act or standby status of the standby transmitter 402. The act report monitoring sections 4 and 4a are connected across each other between an act transmitter 401 and a standby transmitter 402, and inform each other of the act and standby states of their own stations.

The transmission power on instruction confirmation unit 6 controls transmission power on/off of the transmitter 8 according to instructions from the CPU 3, and also reads the on/off state of the transmission power. The transmitter 8 is the demodulator 1
The paging signal sent from the receiver is sent as a radio signal via an antenna 7 to a paging receiver of a radio paging system.

The address bus and data bus are connected to the S/P converter 2 and CP.
U3. Act report monitoring department 4. Transmission power on instruction confirmation unit 6
This is a bus for exchanging signals between the two.

The conventional duplex configuration wireless paging transmitter described above,
There are cases where the act system transmitter 401 cannot receive the transmitter control signal sent from the master station. One possible cause of this is a failure in the connection line with the master station. In this failure, the transmission power of the act system transmitter 401 is not turned on, so the calling signal is not broadcast. On the other hand, even if the standby transmitter 402 can receive the transmitter control signal, it cannot turn on its transmission power because it is a standby transmitter. Therefore, even if there is no problem with the calling signal, the calling signal cannot be broadcast, and the service of calling the wireless call comparison receiver cannot be performed.

[Problem to be solved by the invention]

In the conventional radio paging transmitter described above, if the transmitter cannot receive the transmitter control signal instructing the transmitter to turn on the transmitter's transmission power in the act system transmitter, even if the transmitter control signal is correctly received in the standby system. Even if it were possible, it had the drawback that it could not broadcast a calling signal and could not use a radio calling receiver to provide calling services.

[Means to solve the problem]

The transmitter for the radio paging system of the present invention has dual transmitters for an active system and a standby system, and transmission is sent from a master station of the radio paging system to the active system and standby system transmitters through independent lines, respectively. In a wireless paging system transmitter in which only the active system turns on the transmission power and broadcasts a paging signal in response to a transmission power on instruction signal included in the machine control signal, the active system and standby system transmitters mutually transmit their own system transmission. means for notifying other systems of the on/off of the transmitter's transmitter and monitoring the on/off of the transmitter of the transmitter of the other system; means for notifying and monitoring the standby state to other transmitters; and means for turning on the transmission power of the active transmitter after the standby transmitter receives the transmit power on instruction signal and before the call signal is received. If no notification is detected, the standby transmitter switches between the act transmitter and the standby transmitter, turns on the transmission power of its own transmitter that has newly become the act transmitter, and broadcasts a call signal. It has a control means that performs control.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment according to the present invention, and FIG. 3 is a diagram showing the timing of switching between an active system and a standby system.

Act system transmitter 101. In addition to the conventional embodiment, both the standby transmitter 102 and the transmitter power on notification monitoring unit 5,5
Since the operation is similar to that of the conventional embodiment except for the point a, redundant explanation will be omitted.

The transmission power on notification monitoring unit 5 or 5a is the transmission unit 8 of its own system.
Alternatively, the on/off state of the transmission power of the transmission section 8a is reported to the transmitter 102 or 101 of the other system, and the on/off state of the transmission power of the transmission section 8a or 8 of the other system is read. The transmission power on notification monitoring units 5 and 5a are connected across each other between the active transmitter 101 and the standby transmitter 102,
They mutually notify each other of the on/off status of their own system's transmission power.

Next, the operation of this embodiment will be explained focusing on the act type transmitter 101.

Now, CPtJ3 reads and analyzes the master station transmission signal converted into a parallel signal. If the transmitter control signal is a transmission power on instruction signal for turning on the transmission power of the transmitter 8, it is read from the act report monitoring unit 4 whether the own system is an act system or a standby system.

If the own system is an active system, the transmission power of the transmitting section 8 of the own system is controlled to be turned on through the transmission power on instruction confirmation section 6. At the same time, the transmission power on notification monitoring unit 5 notifies other systems that the transmission power is turned on.

If the own system is a standby system, it waits for notification from other systems that the transmission power is turned on. If the transmission power on notification monitoring unit 5 receives the transmission power on notification from another system before a predetermined time, it waits for the next transmitter control signal instruction. If the transmission power on notification is not received within the predetermined time, the C
The PU 3 instructs the act notification monitoring unit 4 to switch between active and standby, thereby switching the system. Then, after confirming that the system has become the own system or the active system, the transmission power of the transmitter 8 of the own system is turned on.

FIG. 3 is a diagram showing the timing of switching between the act system and the standby system when the standby system cannot receive the transmit power on notification of the act system within a predetermined time.

In Figure 3, the active system is now active, and the backup system is standby. When the transmission power on instruction signal of the master station transmission signal is received, the active side (here, the working system) turns on the transmission power at point A under normal conditions. However, if the transmit power on the act side does not turn on for some reason,
The active system and standby system are switched at point B, and the newly active system (standby system) turns on its transmission power. The time required for switching between the active system and the standby system and for the output of the transmitter to reach the rated value must be made earlier than the time when the broadcast of the dummy signal ends in order to send out the calling signal normally.

〔Effect of the invention〕

As explained above, the present invention enables system switching between the active system and the standby system to be performed when the standby system transmitter does not receive a transmission power on notification from the act system transmitter within a predetermined time. by turning on the transmission power of the transmitter of the newly activated system.
Since the calling signal can be reliably broadcast, it is possible to prevent service degradation to the calling receiver.
The effects are significant.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a radio paging transmitter according to the present invention, FIG. 2 is an example of the configuration of a master station transmission signal, FIG. 3 is a diagram showing switching timing between active system and standby system, and FIG. FIG. 4 is a block diagram showing a conventional embodiment. 1, la... demodulator, 2.2a--S/P converter, 3
．． 3a--CPU, 4, 4a act report monitoring section, 5.
5a... Transmission power on notification monitoring unit, 6 6a... Transmission power on instruction confirmation unit, 7, 7a... Antenna, 8.
8a... Transmitter, 101,401...Act system transmitter, 102,402...Standby system transmitter.

Claims (1)

[Claims] 1. A transmitter control signal having dual transmitters for act and standby, and sent from a master station of a wireless paging system to the act and standby transmitters through independent lines, respectively. In a radio paging system transmitter in which only the active system turns on the transmission power and broadcasts a paging signal in response to a transmission power on instruction signal included in Means for notifying power on/off to other systems and monitoring transmission power on/off of other system transmitters; means for notifying and monitoring other system transmitters; and a means for notifying and monitoring the transmission power on of the active system transmitter after the standby system transmitter receives the transmission power on instruction signal and before the call signal is received. If not detected, the standby transmitter performs control to switch between the act transmitter and the standby transmitter, turn on the transmission power of the own transmitter that has newly become the act transmitter, and broadcast a calling signal. What is claimed is: 1. A transmitter for a radio paging system, characterized in that it has a control means for controlling the radio paging system. 2.Claim 1, wherein switching between the active transmitter and the standby transmitter is completed before transmission of the dummy signal included in the transmitter control signal is completed.
Transmitter for the radio paging method described.