JPH02141128A - Control system for transmission equipment - Google Patents

Abstract

PURPOSE:To save number of transmission cables required for the changeover from an active system to a standby system by sending only a channel selection signal from a controller to a transmitter and generating other signal in the inside of the transmitter based on an output signal of a change detection section. CONSTITUTION:A controller 30 sends only a data to be sent and channel selec tion signals (F SEL) 1-4' to a radio transmitter 2 and does not send other load signal, a rotary switch power signal, a rotary switch changeover signal and an automatic/manual switching signal. If an active system transmission signal generating section of a 1st channel is failed and it is switched to a standby system transmission signal generating section, the level change is detected by an F SEL change detection section 32, a load signal is generated at a time t4 being the result of elapsed time T1 from the point of time of change detection and the signal is fed to the standby system transmission signal generating sec tion in the transmission section 7. Thus, number of transmission cables required to switch active system into the standby system is enough for the number for channel selection signal transmission.

Description

[Detailed Description of the Invention] [Summary] Reducing the number of cables between a wireless transmitter and a control device that controls it, regarding a control method that performs necessary control when switching from a working system to a standby system of a wireless transmitter. In order to switch the transmission signal generation unit from the working system to the protection system, a change detection unit that detects a level change in the channel selection signal and outputs a load signal, and a change detection unit that detects a level change in the channel selection signal and outputs a load signal, and a change detection unit that detects a level change in the channel selection signal and outputs a load signal, and a change detection unit that detects the level change of the channel selection signal and outputs a load signal, and a channel switching instruction section that generates and outputs channel data indicated by the channel data; and a switch switching control section that controls the switch so as to selectively output the transmission signal output from the active transmission signal generation section to the output transmission signal of the protection transmission signal generation section. In the control method for a transmitting device, a control device that controls the transmitting device transmits only a channel selection signal to the transmitting device, and the channel switching instruction section and the switch switching control section control the level change of the channel selection signal. is configured to perform switching control from the active system to the standby system by generating and outputting the channel data and the control signal for the switch after each preset time delay is detected by the change detection unit. .

[Industrial application field]

The present invention relates to a control method for a transmitter, and particularly to a control method for performing necessary control when switching from a working system to a standby system of a wireless transmitter.

In mobile communications, a wide range of service areas are divided into several areas, each of which is called a zone.
A base station will be placed in each of the areas. When mobile communication uses a radio paging system (pager), the base station described above is a radio transmitting device and calls subscribers by radio. (hereinafter referred to as a control device) and a plurality of base stations are connected by cables such as public telephone lines, and the base stations are controlled by wire.

The base station, or wireless transmitter, needs to provide service at all times, so it is equipped with a working system and a backup system, and if the working system goes down, it can be switched to the backup system based on a command from the control device. .

Therefore, it is necessary to prevent malfunctions due to control signal delays and noise contamination on the cable between the control device and the wireless transmitter.

[Conventional technology]

FIG. 4 shows a configuration diagram of an example of a conventional control method for a transmitting device. In the figure, 1 is a control device, and 2 is a wireless transmitter. Data regarding a calling number for calling a specific subscriber is transmitted from the control device 1 to the wireless transmitter 2 via a cable, and channel selection is also performed. Signal (hereinafter referred to as F SEL
), load signal, rotary switch power signal,
Rotary switch switching signals, automatic/manual switching signals, etc. are transmitted to the wireless transmitter via separate cables.

The above F SEL has, for example, a total of four channels, each of which is denoted by F SEL■ to F SEL■, and these are transmitted separately using four cables.

The wireless transmitter 2 sends each of the above signals to the interface circuit 3.
The data is supplied to the transmitter 7, the F SEL■ to F SEL■ are supplied to the FSEI change detector 4, the load signal is supplied to the transmitter 7, and the rotary switch power signal and The rotary switch switching signal is supplied to the rotary switch control section 6, and the automatic/manual switching signal is supplied to the transmitting section 7.

F SEL■ to F SEL■ are each at a high level when the wireless transmitter 2 is operating in the active system circuit, but when switching to the protection system, only the F SEL of the channel to be switched to the protection system is low. level.

The F SEL change detection unit 4 detects this F SEL■～F
Only when a change in the logic level of SEL■ is detected, a change detection signal is generated and supplied to the channel switching instruction section 5. The channel switching instructing section 5 generates channel data instructing which channel should be switched to the protection system based on the change detection signal, and supplies it to the transmitting section 7 .

The automatic/manual switching signal is used for maintenance of the wireless transmitter 2, and when it is set to manual, transmission is stopped and the rotary switch is manually switched to switch the transmission signal from the standby transmission signal generator. It is possible to output this information and replace parts of the currently used transmission signal generator.

The Tally switch switching control section 6 generates a switch power signal and a switch switching signal at predetermined timing based on the command from the control device 1, and supplies them to the transmitting section 7. When in use, the rotary switch power is turned off. This is to save power consumption.

The main parts of the transmitting section 7 are constructed as shown in FIG.

In the figure, 10 is a standby transmission signal generation section, 11.12.1
3 and 14 are the first. Second. The 3rd and 4th channel transmission signal generators 15 to 18 are rotary switches, respectively. The rotary inches 15 to 18 are provided corresponding to the first to fourth channel transmission signal generation sections 11 to 14, and transmit either the transmission signal of the channel or the transmission signal from the backup transmission signal generation section 10. Select and output.

The transmission signal generators 11 to 14 are currently in use, and the transmission signals extracted from these in respective predetermined frequency bands are output to the transmission antenna 8 through rotary switches 15 to 18 and transmitted.

Here, if it is assumed that, for example, the first channel transmission signal generation section 11 among the active transmission signal generation sections 11 to 14 has failed, the wireless transmission device 2 sends an alarm to the control device 1 to notify that fact.

As a result, the control device 1 sets FSEL■ to a low level, FSEL■ to FSEL■ to a high level, and outputs a load signal, a rotary switch power signal, a rotary switch switching signal, etc. at predetermined timing.

This level change of F SEL■ is shown in Figure 4.
It is detected by the SEL change detection section 4, and the channel data of the first channel is supplied from the channel switching instruction section 5 to the standby transmission signal generation section 10 shown in FIG. 5 in the transmission section 7.

The standby transmission signal generation section 10 converts the frequency of the signal modulated by the transmission data into the frequency band of the desired channel, and has a phase locked loop (PLL) as a local oscillator for this purpose. After that, when the above channel data is input, the local oscillation frequency is switched to the local oscillation frequency of the channel indicated by the channel data. Therefore, in the above case, the setting is made such that the transmission signal in the frequency band of the first channel is output from the standby transmission signal generation section 10.

On the other hand, the rotary switch 15 is powered on by the switch power signal from the rotary switch switching control section 6, and the rotary switch 15 is switched to the standby transmission signal generation section 10 side by the switch switching signal. Thereafter, the operation of the standby transmission signal generating section 10 is started, and the transmission signal in the frequency band of the first channel extracted from this is guided to the antenna 8 through the rotary switch 15. In this way,
Switching from the active system to the standby system is performed.

(Problem to be Solved by the Invention) However, in the conventional control method described above, each signal for switching to the standby system is supplied from the control device 1 to the wireless transmitter 2 via separate cables. Because there are a large number of cables, and the control device 1 determines the timing of each signal, there may be signal delays or noise on the cable between the control device 1 and the wireless transmitter 2. Problems such as malfunctions occurred.

The present invention has been made in view of the above points, and an object of the present invention is to provide a control method for a transmitting device that can reduce the number of cables between a wireless transmitting device and a control device that controls the wireless transmitting device.

[Means to solve the problem]

FIG. 1 shows a basic configuration diagram of the present invention. In the figure, 20 is a control device, 27 is a transmitter, and the control device 20 is the transmitter 2.
Controls the operation of 7. The transmitting device 27 includes a change detecting section 21.
Channel switching instruction unit 22° Active transmission signal generation unit 23.
Standby transmission signal q generation section 24. A switch 25 and a switch switching control section 26 are provided.

In the present invention, only the channel selection signal is transmitted from the control unit @ 20 to the transmitting device 27, and the channel switching instruction unit 22 and the switch switching control unit 26 are set in advance from the time when the level change of the channel selection signal is detected by the change detection unit 21. Channel data and a control signal for the switch 25 are generated and outputted with respective time delays.

As a result, the switch 25 is activated by the active transmission signal generator 23.
Switching control is performed to selectively output the output transmission signal of the standby system transmission signal generation section 24 from among the output transmission signals of.

[Effect]

The signals required to switch from the working system to the protection system are at least a channel selection signal and a load signal.

Channel data and switch switching control signals, but the present invention does not transmit all these signals from the control unit @20 to the transmitting device 27, but only transmits the channel selection signal, and other signals are sent to the change detection unit 21. is generated inside the transmitting device 27 based on the output signal of.

That is, channel data can be generated depending on which channel selection signal among a plurality of channel selection signals has a level change, and the switch changeover control signal and load signal can also be generated at the time when the change detection unit 21 detects a level change in the selection signal. Each signal can be generated by setting the output timing in advance relative to the output detection signal of the change detection section 21, since it is only necessary to generate and output the signals at relatively different time timings. .

Therefore, the number of transmission cables required from the control device 20 to the transmitting device 27 for switching from the active system to the standby system is only for channel selection signal transmission.

〔Example〕

Figure m2 shows a configuration diagram of an embodiment of the main part of the present invention. In the figure, the same components as those in FIG. 4 are denoted by the same reference numerals, and the explanation thereof will be omitted. In FIG. 2, 30 is a control device, which corresponds to the control device 20 shown in FIG. This control device 3
0 is different from the conventional control device 1, the wireless transmitter 2 has data to be transmitted and a channel selection signal @ (F S E
L) Only ■ to ■ are transmitted, and other load signals, 0-tary switch power signals, rotary switch switching signals, and automatic/manual switching signals are not transmitted. This is because the signals that are not sent are generated within the wireless transmitter N31.

Further, 32 is an F SEL change detection unit which corresponds to the change detection unit 21, 33 is a channel switching instruction unit which is a circuit which corresponds to the channel switching instruction unit 22, and 34 is a rotary switch switching control unit which controls the switch switching. This circuit corresponds to section 26.

Furthermore, 35 is an automatic/manual switching control section.

Note that the first active transmission signal generation section 23. The standby transmission signal generator 24 and the switch 25 are located in the transmitter 7 in FIG. 2, and the switch 25 is located in the rotary switches 15 to 15 in FIG.
It corresponds to 18.

The F SEL change detecting section 32 outputs a change detection signal in the same way as the conventional F SEL change detecting section 4 , but unlike the conventional one, it is ti, and also generates an O-do signal and sends it to the transmitting section 7 .

Next, since the active transmission signal generation section of the first channel has failed, the operation will be described with reference to FIGS. 2 and 3 in the case where the active transmission signal generation section is switched to the protection transmission signal generation section. Control device 3
Four channel selection signals F from 0 SEL■ to F
SEL■ is normally at a high level, but an alarm from the wireless transmitter 31 to the tlJm device 30 causes the control device 30 to set F SEL■ at time t1 as shown in FIG.
only is set to low level.

This level change is detected by the F SEL change detection section 32, and the level change detection signal is sent to the channel switching instruction section 33.
and the rotary switch switching control section 34. Meanwhile, the F SEL change detection section 32 generates a load signal as shown in FIG. The signal is supplied to the standby transmission signal generating section (indicated by 10 in FIG. 5) in the internal circuit.

もI! The channel switching instructing unit 33 changes the setting R to 2 from the time t1 when the level change detection signal in E is input (however, T2 > T
I) From the elapsed time t5, as shown in FIG. 3, transmission of channel data indicating that the channel is the first channel is started. As mentioned above, the standby transmission signal generator (1 in Fig. 5)
0) takes in the reverse channel data into which the load signal is input, and generates and outputs a variable lIJ-controlled transmission signal in the frequency band specified by the channel data. Therefore, in this embodiment, the O-do signal is generated and output at time t4 earlier than channel data output start time t5.

Further, when the rotary switch switching control section 34 receives the above-mentioned level change detection signal as an input signal, the rotary switch switching control section 34 outputs a third signal that is at a high level for a certain period of time from time t2, which is a time Ta (however, T3 < T+) elapsed from the input time t1. After generating and outputting the switch power signal as shown in the figure, the setting time m T 4 (however, T3 < T4
<T+) A switch changeover signal as shown in FIG. 3 is generated and outputted, which remains at a high level for a certain period of time from time t3.

As a result, the rotary switch for the first channel (indicated by 15 in FIG. 5) in the transmitting section 7 is supplied with power from time t2, and immediately after that, at time t2, the rotary switch for the first channel in the transmitting section 7 (indicated by 15 in FIG. Switching control is performed to the system transmission signal generation section side. After time t5, the protection transmission signal generation section is set to output the transmission signal of the first channel, and after the channel data output is completed, the protection transmission signal generation section starts operating by a signal (not shown). The output transmission signal begins to be transmitted.

The reason why the operation of the transmission signal generator is stopped before and after the rotary switch is switched is because if this is not done, the rotary switch will be destroyed when the switch is switched.

Note that when F-8EL■ to F SEL■ all become low level at the same time, the automatic/manual switching control section 3
5 determines that it is a manual instruction and sends a manual switching signal to the transmitter 7, allowing the transmitter 7 to be operated manually.

Note that the present invention is not limited to the above embodiments, and may be applied to load signals and channel data, for example.

Each signal may be generated and output in the order of the switch power signal and the switch switching signal, and is also applicable to systems other than wireless paging systems. Furthermore, it goes without saying that the number of channels is not limited to four channels.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reduce the number of transmission cables required from the control device to the transmitter to switch from the active system to the protection system compared to the conventional system, and also to switch to the protection system using only a channel selection signal. Since all the various signals necessary for switching can be generated within the transmitting device, signal delays and noise caused by cables can be significantly reduced.Moreover, there is almost no timing deviation between the various signals, so there is no malfunction and stability. It has features such as being able to perform switching control.

27 is a transmitting device Not shown.

Claims (1)

[Claims] In order to switch the transmission signal generation section from the working system to the protection system, a change detection section (21) that detects a level change in the channel selection signal and outputs a load signal, and a change detection section (21) that detects a level change of the channel selection signal and outputs a load signal, and a change detection section (21) for switching the transmission signal generation section from the working system to the protection system. A channel switching instruction section (22) that generates and outputs channel data indicating the channel of the system, and a working system transmission signal generation section (
23) from the output transmission signal of the backup transmission signal generator (24).
) switch (25) to selectively output the output transmission signal.
), the transmitting device (27) includes a switch switching control section (26) that controls the transmitting device (27).
7) transmits only a channel selection signal from the control device (20) that controls the transmitter (27), and the channel switching instruction section (22) and the switch switching control section (26) transmit the channel selection signal. By generating and outputting the channel data and the control signal for the switch (25) after a preset time delay from the time when a level change is detected by the change detection section (21), the current system is transferred from the active system to the backup system. A control method for a transmitting device characterized by performing switching control.