JP2007074654A - Base station device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cost, when making transition from an analog system to a digital system. <P>SOLUTION: A base station device in a digital radio communications system comprises a transmission section for sending transmission radio waves to a mobile station device always; a power failure detection section for detecting power failure of a commercial power source and outputting an always transmission stop signal, when the detected power failure state continues for a fixed time; and a transmission control section for stopping sending the always transmission radio waves from the transmission section, in response to the always transmission stop signal from the power failure detection section. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a base station apparatus in a digital radio communication system.

In electric power companies, wireless communication systems are used to give business instructions such as recovery measures in the event of a distribution line accident. In this wireless communication system, base stations are installed at power company sales offices and relay stations at the top of the mountain. Wireless communication is being performed with the station. At present, analog systems are adopted in many of such wireless systems. In an analog wireless communication system, radio waves are transmitted only when communication (call) is performed. The base station side in this wireless communication system is normally operated by a commercial power supply supplied from a distribution line, but a power supply device such as a storage battery is installed in case of a power failure.
JP 2000-22610 A

  In recent years, a wireless communication system used by electric power companies and other public wireless communication systems are being shifted to digital systems. In operation of a digital wireless communication system, a transmission radio wave is constantly transmitted on the base station side for automatic switching of the frequency on the mobile station side. For this reason, it is necessary to make the capacity of a power supply device such as a storage battery provided on the base station side larger than that of the current analog system in order to perform power failure compensation. Therefore, when shifting from the analog system to the digital system, it is necessary to secure an installation space (such as expansion of a station building / land acquisition) and reinforcement of the station building. In addition, the cost of the power supply for power failure compensation itself is increased.

  The base station apparatus in the digital radio communication system of the present invention detects a power failure of a commercial power supply, a transmission unit that constantly transmits radio waves to the mobile station device, and a normal transmission stop signal when the detected power failure state continues for a certain period of time. And a transmission control unit for stopping transmission of a constantly transmitted radio wave by the transmission unit in response to a regular transmission stop signal from the power failure detection unit.

  In the base station device, a receiving unit that receives radio waves from the mobile station device, and outputs a normal transmission activation signal when radio waves from the mobile station device are received by the receiving unit during a transmission stop period of constantly transmitted radio waves It is preferable that the transmission control unit further resumes transmission of a constantly transmitted radio wave by the transmission unit in response to a constant transmission activation signal from the reception control unit.

  In the base station apparatus, after the transmission of the constant transmission radio wave is resumed, the transmission control unit holds the transmission state of the constant transmission radio wave by the transmission unit for a certain period of time, and then stops the transmission of the constant transmission radio wave by the transmission unit again. Is preferable.

  In the base station apparatus, the power failure detection unit outputs a normal transmission activation signal upon detecting a power recovery of commercial power, and the transmission control unit responds to the regular transmission activation signal from the power failure detection unit, It is preferable to resume transmission of the constantly transmitted radio wave by the transmission unit.

  In the base station apparatus according to the present invention, when a power failure occurs for a certain time or longer, the transmission of the transmission radio wave is stopped at all times, so that the current consumption on the base station side at the time of the power failure can be reduced. Thereby, the storage battery power failure compensation time can be extended, and the storage battery capacity can be reduced. As a result, it is possible to reduce the cost of related expenses such as the addition of office buildings.

  In addition, when a radio wave is received from the mobile station apparatus during the transmission stop period of the constantly transmitted radio wave, the transmission of the constantly transmitted radio wave is resumed, so that communication between the mobile station apparatuses and call relay on the approach line are possible.

  In addition, after the transmission of the constantly transmitted radio wave is resumed, the transmission state of the constantly transmitted radio wave by the transmission unit is maintained for a certain period of time, so that frequent switching between the constantly transmitted radio wave transmission state / transmission stop state can be avoided and the transmission unit is protected. Is done.

  In addition, since the transmission of the constantly transmitted radio wave is automatically resumed after the power recovery, it is possible to prevent the person in charge of operation from forgetting to return to the normal operation (the transmission state of the constantly transmitted radio wave) after the power recovery.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, substantially the same parts are denoted by the same reference numerals.

FIG. 1 shows a schematic configuration of a digital radio communication system according to an embodiment of the present invention. In this system, a base station device 100 is installed at a power company sales office, a mountain relay station, or the like, and a mobile station device such as an in-vehicle wireless device or a portable wireless device within a range in which radio waves from the base station device 100 reach. Wireless communication is performed between the person in charge at the site and the communication station by 4a and 4b. The operation of this system will be described below.
(1) Normal operation (1-1) Power supply to base station radio 2 The power supply device 1 receives the commercial power supply 13 and converts it into direct current by a rectifier 14, charging the storage battery 15 and the base Power supply 16 is performed to the station radio 2. As a result, power is supplied to the base station radio 2.
(1-2) Flow of Transmission Radio Wave Base station radio 2 is connected to communication station control console 3. The channel selection button 6 in the communication station control console 3 is ON. By performing press control, the transmission activation signal input 30 to the transmission control unit 7 is turned ON, and transmission from the transmission control unit 7 to the transmitter 5 is ON. A command is issued. In response to this command, radio waves carrying audio signals are emitted from the antenna 8 and reach the mobile station devices 4a and 4b. The current consumption of the base station radio 2 at this time is approximately 4.2 amperes, for example.
(2) Operation at the time of power failure (2-1) Power supply to the base station radio 2 When a power failure occurs, the power supply 1 stops receiving the commercial power supply 13 and stops the operation of the rectifier 14. Then, discharging starts from the storage battery 15, and power is supplied to the base station radio 2 by the power supply 16 from the storage battery 15.
(2-2) Flow of transmission radio wave The base station radio 2 is connected to the communication station control console 3. The channel selection button 6 in the communication station control console 3 is ON. By performing press control, the transmission activation signal input 30 to the transmission control unit 7 is turned ON, and transmission from the transmission control unit 7 to the transmitter 5 is ON. A command is issued. In response to this command, radio waves carrying audio signals are emitted from the antenna 8 and reach the mobile station devices 4a and 4b.

When a commercial power failure occurs, the commercial power supply 13 stops receiving power and the power failure detection relay 10 of the power supply device 1 detects the power failure. The contact 11 is turned on after a fixed time has elapsed since the power failure was detected (here, from several minutes to several tens of minutes), whereby the normal feed stop signal input 12 connected to the transmission control unit 7 is turned on. When the normal transmission stop signal input 12 is turned ON, a transmission stop signal is sent from the transmission control unit 7 to the transmitter 5. In response to this transmission stop signal, the transmission of the transmitter 5 is stopped, and the radio wave from the antenna 8 is stopped. As a result, the arrival of radio waves at the mobile station devices 4a and 4b stops (see FIG. 2A). The current consumption of the base station device 2 at this time is, for example, about 2 amperes, which is about half that of the current (about 4.2 amperes) during normal transmission (1-2 described above). In this way, the power supply 16 from the storage battery 15 to the base station radio 2 adds this circuit as compared to the normal transmission state (1-2) of the base station radio 2, and the normal transmission of the base station radio 2 It will be smaller when you stop. For this reason, when the capacity | capacitance of the storage battery 15 is the same, in the normal transmission (1-2) and the normal transmission stop (2-2), the normal transmission stop (2-2) can be used for a longer time. Specific examples are shown below.
(Example) The storage battery capacity is set to 100 ampere · hour (A · h). Assuming that the current consumption during normal transmission is 4 amperes, the usable time of the storage battery in the regular transmission state is 100 amperes · hour ÷ 4 amperes = 25 hours. Further, assuming that the consumption current at the time of stopping the normal feeding is 2 amperes, the usable time of the storage battery in the state of stopping the normal feeding is 100 amperes · hour ÷ 2 amperes = 50 hours.

  Here, if the required power outage time (power outage compensation time) is 25 hours, the storage battery capacity required to be able to be used for 25 hours in the normal transport stop state is 25 hours × 2 amps = 50 amps / hour by the above reverse calculation. Thus, the capacity of the storage battery 15 can be reduced. The above numbers are simplified for the purpose of explaining the concept, and are different from the actual ones. Such operations are not always performed.

As described above, according to the present embodiment, the capacity of the storage battery 15 necessary for compensating for a predetermined power failure time can be reduced, so that the size and weight of the related power supply device 1 are reduced, and the power supply device 1 and the base station are reduced. The space (building / land) where the wireless device 2 is installed can be reduced, and necessary funding can be reduced.
(2-3) Operation of a transmission command from the communication station control console 3 during the occurrence of a power failure In such a state where the power failure of the commercial power supply 13 continues (when the normal transmission is stopped), the mobile console device 4a , 4b, the channel selection button 6 of the communication station control console 3 is artificially turned on. In response to this, the normal transmission activation signal input 9 is turned ON, and this is input to the transmission control unit 7, a transmission start signal is transmitted from the transmission control unit 7 to the transmitter 5, and the transmitter 5 is in the transmission state (normal state). The radio wave carrying the audio signal is emitted from the antenna 8 by press control from the communication station, and reaches the mobile station devices 4a and 4b. The current consumption of the base station radio 2 at this time is a current during normal transmission (for example, about 4.2 amperes).

When the above-described artificial operation is completed, 17: the normal feed stop signal is input, 18: the normal feed start signal is input after the set time has elapsed, and 19: the normal feed is stopped again (FIG. 2B). reference). The current consumption of the base station radio 2 at this time is, for example, about 2 amperes, and again becomes about half compared with the current (1-2) during normal transmission (about 4.2 amperes).
(2-4) When an incoming call is received from the mobile station device 4a or 4b during the occurrence of a power outage When the commercial power supply 13 continues to be out of power (when the normal transmission is stopped), the radio wave from the mobile station device 4a or 4b Is received by the antenna 8 and the receiver 21, in response, the reception control unit 22 turns on the normal transmission activation signal input 23, which is input to the transmission control unit 7 and transmitted from the transmission control unit 7 to the transmitter 5. A start signal is sent, and the transmitter 5 enters a transmission state (normal transmission state). Thereby, communication between the mobile station apparatuses 4a and 4b becomes possible. In addition, when the base station apparatus 100 of the present invention is applied to the Yamagami radio relay station in the system configuration shown in FIG. 3, communication between the mobile station apparatus 4a or 4b and the communication station control console 3 is also possible. .

As described above, when the transmission from the mobile station apparatus 4a or 4b is received and the transmission of the constantly transmitted radio wave is resumed, the normal transmission state is maintained for a set time (here, about 30 minutes) and then the normal transmission is stopped again (FIG. 2). (See (c)). By maintaining the normal transmission state for a certain time in this way, frequent switching between the normal transmission state / normal transmission stop state can be avoided and the transmitter 5 is protected.
(3) Operation after power recovery When recovering from a power failure, the contact 11 is turned OFF, whereby the constant feed stop signal input 12 connected to the transmission control unit 7 is turned OFF. In addition, the constant feed activation signal input 24 to the transmission control unit 7 is turned ON, a transmission ON command is issued from the transmission control unit 7 to the transmitter 5, and the normal transmission state is restored (see FIG. 2D). As described above, in the present system, after the power recovery, the system is automatically returned to the normal transmission state, so that it is possible to prevent the person in charge of operation from forgetting to return to the normal operation (normal transmission state) after the power recovery.

  As described above, in the digital wireless communication system according to the present embodiment, when a power failure occurs for a certain time or longer, the transmission of the constantly transmitted radio wave from the base station device 100 to the mobile station devices 4a and 4b is stopped. The current consumption on the base station side can be reduced. Thereby, the storage battery power failure compensation time can be extended, and the storage battery capacity can be reduced. As a result, it is possible to reduce the cost of related expenses such as the addition of office buildings.

  The present invention is useful for migrating an existing analog wireless communication system to a digital system at a low cost.

It is a block diagram which shows the outline of the whole structure of the digital radio | wireless communications system by embodiment of this invention. It is a figure for demonstrating operation | movement of the system shown in FIG. It is a figure which shows the example of application of the digital radio | wireless communications system by embodiment of this invention.

Claims (4)

A base station apparatus in a digital wireless communication system,
A transmission unit that constantly transmits radio waves to the mobile station device;
A power failure detection unit that detects a power failure of a commercial power source and outputs a continuous feed stop signal when the detected power failure state continues for a certain period of time;
In response to a regular transmission stop signal from the power failure detection unit, a transmission control unit that stops transmission of a constantly transmitted radio wave by the transmission unit,
A base station apparatus. In claim 1,
A receiving unit for receiving radio waves from the mobile station device;
A reception control unit that outputs a continuous transmission start signal when a radio wave from the mobile station device is received by the reception unit during a transmission stop period of a constant transmission radio wave;
The transmission control unit
In response to a constant transmission activation signal from the reception control unit, restart transmission of a constantly transmitted radio wave by the transmission unit,
A base station apparatus. In claim 2,
The transmission control unit
After resuming the transmission of the constantly transmitted radio wave, holding the transmission state of the constantly transmitted radio wave by the transmitting unit for a certain period of time, then stopping the transmission of the constantly transmitted radio wave by the transmitting unit again,
A base station apparatus. In claim 1,
The power failure detection unit is
When power recovery of commercial power is detected, a constant feed start signal is output,
The transmission control unit
Responsive to the always-on activation signal from the power failure detection unit, restart the transmission of the constantly transmitted radio wave by the transmission unit,
A base station apparatus.

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