JP2845721B2 - Wireless communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio system using a hot standby system, and more particularly to a radio communication system for reducing power consumption in a communication station.

[0002]

2. Description of the Related Art In digital wireless communication, from the viewpoint of reducing power consumption and securing system gain, a system for controlling opposing transmission power based on reception input level information, a transmission power control system (Automatic Transmitting Power Control;
ATPC) (for example, Japanese Patent Application Laid-Open No.
No. 07214). On the other hand, as a conventional method, a hot standby system in which a transmitter is provided in two working and standby systems, one of which is normally operated, and which switches to the other in the event of a failure is used (for example, " Digital Microwave Communications, edited by Moruji Kuwahara, Publishing Planning Center, pp. 295-297, 8.1.4 Preliminary method).

Therefore, a transmission power control method in a radio apparatus using a hot standby method combining these methods has been proposed. FIG. 3 is a block diagram of one example. In the figure, 1 is a first station, and 2 is a second station opposed thereto. The first station 1 includes an antenna 10,
Receiver board 11, demodulation board 12, modulation boards 13A and 13B, transmission boards 14A and 14B, transmission power controller 15 ', switch 1
6, a switching control panel 17 is provided. In addition, the second station 2
Are antenna 20, receiving board 21, demodulating board 22, modulating board 2
3A and 23B, transmission boards 24A and 24B, a transmission power controller 25, and a switch 26.

In the first station 1, on the transmitting side, a digital signal to be transmitted is split into two branches, and the modulation boards 13A, 1
3B and modulated to IF band. The signals modulated in the IF band are respectively used for working and backup transmitters 14A, 14B,
After being converted to a transmission frequency, the signal is output as a transmission output corresponding to the transmission power control signal (CONT) from the transmission power controller 15 ′, and is input to the switch 16. Further, the modulation boards 13A and 13B and the transmission boards 14A and 14B
The warning information (ALM1-4) is input to the switching control panel 17, and the modulation panels 13A and 13B and the transmission panel 14A
And 14B both output a switching control signal (SW CONT) for selecting the one operating normally. Switch 1
In step 6, the output of the transmission board 14A or 14B of the normal transmission system is selected based on the switching control signal (SW CONT) and output to the antenna 10.

On the other hand, in the second station 2, the signal received by the antenna 20 is input to the receiving board 21. In the receiving board 21,
Received input level information (Re
ceiving Signal Sevel (RSL) is transmitted by the transmission power controller 25.
Output to Received input level information (RSL)
Is compared with the level information defined in advance in the transmission power controller 25. For example, when the level is lower than the level information, the modulation board 23A, the control information (DATA1) for controlling to increase the transmission output of the first station. 23B. The control information (DATA1) is multiplexed into additional bits of the digital signal by the modulation boards 23A and 13B, and is multiplexed to the transmission boards 24A and
The signal is transmitted from the antenna 20 to the first station via 24B.

[0006] The signal from the second station is received by the antenna 10 of the first station, input to the receiver 11, converted into an IF signal, and input to the demodulator 12. This input signal is demodulated and reproduced after demodulation, separated into a data signal sent from the opposite station and control information (DATA1), and output to the outside and the transmission power controller 15 ', respectively. Thereby, as described above, each of the transmission boards 14A and 14B is set to the transmission output corresponding to the transmission power control signal (CONT) from the transmission power controller 15 'based on this control information (DATA1). .

[0007]

In the transmission power control method in the conventional hot standby method described above, the first station uses the control information of the transmission power transmitted from the second station as the opposite station, and the first station uses the current and standby power. Since both transmitters integrally control the output, for example, when controlling to increase the transmission power, the power of the spare transmitter not being used at the same time as the current transmitter is also increased. There is a problem in that the power consumed by the transmission board on the side is wasted and the original purpose of reducing power consumption cannot be achieved. An object of the present invention is to provide a wireless communication system capable of reducing power consumption in a transmission power control method in a hot standby method.

The wireless communication system of the present invention employs a hot standby system in which each of active and standby transmitters is switched and used, and one of two opposing stations monitors the reception level and controls the level. In a wireless communication system that employs a transmission power control method of controlling transmission power by transmitting information to the other station, the two stations each
Based on a switching control signal for switching each transmitter of the own station ,
Of the working and backup transmitters, the output of the operating transmitter is set to a predetermined high power, and the output of the non-operating transmitter is set to a low power lower than the standard level by a specified value.
Transmission power to control the transmission output of each transmitter independently
Has a controller . Also, the transmission power controller receives control information from one station as input, and outputs a transmission power control signal for controlling transmission power and a preset low power transmission power. working a prescribed value control signal generating circuit for outputting a prescribed value output control signal, and a prescribed value output control signal to these transmission power control signal for, pre
And a control signal switching circuit for selectively selectively outputting to each of the transmitters in response to a switching control signal for switching each of the transmitters .

[0009]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a transmission power control system according to an embodiment of the present invention, wherein 1 is a first station, 2 is a second station opposite thereto, and the same reference numerals are given to the same parts as those of the conventional configuration. It is. The first station 1 includes an antenna 10 shared for transmission and reception,
A receiving board 11 and a demodulating board 12 are provided on the receiving side. In addition, as the transmitting side, each of the working and standby modulation boards 13
A, 13B and transmission boards 14A, 14B are provided, and a transmission power controller 15, a switch 16, and a switching control board 17 are further provided. Similarly, the second station 2 is provided with an antenna 20, a receiving board 21, and a demodulating board 22, and further includes modulation boards 23A, 2A.
3B, transmission boards 24A and 24B, a transmission power controller 25, and a switch 26.

In this case, the transmission power controller 15
The transmission control circuit 151, the specified value control signal generation circuit 152, and the control signal generation circuit 153
Consists of Here, the transmission control circuit 151 has the second
Control information (DATA1) transmitted from the station is input, and a power control signal for controlling transmission power is output from the control information (DATA1). The specified value control signal generation circuit 152 outputs a specified value output control signal for performing control to output a preset transmission power. Control signal switching circuit 15
3 switches the control signals output from the transmission control circuit 151 and the specified value control signal generation circuit 152, and transmits the transmission power control signals (CONT1, 2) to the respective transmission boards 14A, 14B.
Are output selectively. The switching operation of the control signal switching circuit 153 is performed by a switching control signal (SW CONT) output from the switching control panel 17.

According to this configuration, in the first station 1, on the transmitting side, the digital signal to be transmitted is split into two, input to the modulation boards 13A and 13B, respectively, and modulated into the IF band. The signals modulated in the IF band are respectively input to working and backup transmission boards 14A and 14B, converted into transmission frequencies, and then converted into transmission power control signals (CONT) from a transmission power controller 15 as described later. The corresponding transmission output is output and input to the switch 16. Modulation board 13
The warning information (ALM1 to ALM4) of each of the A and 13B and the transmission boards 14A and 14B is input to the switching control board 17, and both the modulation boards 13A and 13B and the transmission boards 14A and 14B operate normally. Switching control signal (SW
CONT). The switch 16 selects the output of the transmission board 14A or 14B of the normal transmission system based on the switching control signal (SW CONT) and outputs it to the antenna 10.

On the other hand, in the second station 2, the signal received by the antenna 20 is input to the receiving board 21. In the receiving board 21,
Received input level information (R
SL) to the transmission power controller 25. The input received input level information (RSL) is compared with the predetermined level information inside the transmission power controller 25. For example, if the received input level information is lower than the predetermined level information, the control to increase the transmission output of the first station 1 is performed. The control information to be performed (DATA1) is output to the modulation boards 23A and 23B. Control information (DAT
A1) is multiplexed with additional bits of a digital signal by modulation boards 23A and 23B and transmitted from transmission boards 24A and 24B to antenna 2
0 is transmitted to the first station side.

The signal from the second station 2 is received by the antenna 10 of the first station, input to the receiver 11, converted into an IF signal, and input to the demodulator 12. This input signal is
After demodulation, the signal is discriminated and reproduced, separated into a data signal sent from the opposite station and control information (DATA1), and output to the outside and the transmission power controller 15, respectively. Accordingly, each of the transmission boards 14A and 14B transmits a transmission power control signal (C) from the transmission power controller 15 based on the control information (DATA1).
ONT).

At this time, the switching control signal (SW CONT) from the switching control panel 17 is transmitted to the transmission power controller 15 here.
Is also output to Therefore, this switching control signal (SW
(CONT), the transmission power controller 15 outputs a power control signal from the transmission control circuit 151 to one of the active transmission boards 14A or 14B, sets the power control signal to high power, and sets the transmission board 14A or 14B to be used as a backup. To the other side, a specified value control signal is output from the specified value signal generation circuit 152 to set low power. In other words, in order to transmit the corresponding transmission power control signals as the working / spare to each of the two transmission boards, and in particular to make the power of the spare transmission board lower than that of the working transmission board,
It is possible to control transmission power efficiently. As a result, the power consumption of the first station can be reduced by an amount corresponding to the setting of the low power of the spare transmission board. Here, in the above description, the first station is defined as the transmitting side and the second station is defined as the receiving side. It goes without saying that control can be executed.

[0015]

As described above, the wireless communication system according to the present invention is capable of switching between the active and standby transmitters in the hot standby system and the active and standby transmitters.
Set the output of the operating transmitter to a predetermined high power
And the transmission output of the non-operating transmitter is lower than the standard value.
Since the control is performed so as to decrease by the specified value , for example, even when the current transmission power is increased, the spare transmission power can be suppressed low, and the power consumption of the entire communication station can be reduced. Further, in the present invention, a configuration is such that a control signal from the other station and a preset specified value control signal can be selectively switched, and in the transmission power controller,
Since each control signal is switched by a switching control signal for switching between the active and standby transmitters, the output of each transmitter can be independently controlled simultaneously with the hot standby operation, and the standby transmission power as described above can be reduced. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram of a wireless communication system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a transmission power controller of FIG.

FIG. 3 is a block diagram showing an example of a conventionally proposed wireless communication system.

[Explanation of symbols]

 Reference Signs List 1 1st station (own station) 2 2nd station (opposite station) 10, 20 antennas 11, 21 receivers 12, 22 demodulators 13A, 13B, 23A, 23B modulators 14A, 14B, 24A, 24B transmitters 15, 25 transmission power controller 16, 26 switch 17 switching control board 151 transmission control circuit 152 specified value control signal generation circuit 153 control signal switching circuit

Claims (2)

(57) [Claims] 1. A hot standby system in which an active and a standby transmitter is switched and used, and a reception level is monitored by one of two opposing stations, and the control information is transmitted to the other station. In a wireless communication system adopting a transmission power control method of controlling a transmission output by transmitting, the two stations each switch between their own transmitters.
Based on the switching control signal , set the output of the working transmitter among the working and slave transmitters to a predetermined high power, and set the output of the non-operating transmitter to a specified value from the standard level. And set the transmission power of each transmitter to low power.
A wireless communication system having a transmission power controller that controls independently . Wherein said transmission power controller receives as input control information from one station, a transmission control circuit for outputting a transmission power control signal for controlling the transmission power, low power transmission of a preset A specified value control signal generating circuit for outputting a specified value output control signal for outputting power; and a transmission power control signal and a specified value output control signal for each of a working and a backup.
Wherein in response to the switching control signal for switching the transmitter
Wireless communication system according to claim 1, characterized in that it consists of a control signal switching circuit for outputting selectively switches independently to each transmitter.