JP2002290291A - Mobile communication base station device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base station device in which a base station outdoor section provided with a reception amplifier can be adaptive to one system feeding and both-system feeding. SOLUTION: The base station device has a base station outdoor section 100 and a base station indoor section 101, which are interconnected by transmission lines 116, 117, and 120. The base station outdoor section 100 includes reception amplifiers 104, 105 connected to a plurality of reception signal lines and power separators 106, 107 that separate power superimposed on the transmission lines 116, 117. Power changeover sections 112, 113 are placed between the reception amplifiers 104, 105 and the power separators 106, 107 to select power sent from the power separators 106, 107 and to supply the power to the reception amplifiers 104, 105.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station apparatus for mobile communication, and more particularly to a base station apparatus for supplying power from an indoor part of a base station to an outdoor part of the base station via a signal line.

[0002]

2. Description of the Related Art In a base station apparatus in a mobile communication system, it is widely practiced to build a steel tower on the ground or on the roof of a building and install an antenna on the top of the tower. that time,
To compensate for the loss of cable from the antenna to the receiver installed inside the base station indoors, the noise figure increases and the communication quality deteriorates. Can be

FIG. 8 shows a configuration example of a conventional base station apparatus.
The base station apparatus includes a base station outdoor unit 800 and a base station indoor unit 80
1. It is provided with antennas 818 and 819. The base station outdoor unit 800 includes an antenna duplexer 802, a reception bandpass filter 803, reception amplifiers 804 and 805, and power separators 806 and 807.
Each of 5 obtains power required for operation from power separators 806 and 807. This power is supplied to the base station indoor unit 80.
1 from the power supply units 810 and 811
8 and 809, the signal is superimposed on each signal line,
6,817. In the example of FIG. 8, the power separators 806 and 807 and the power superimposers 808 and 808 correspond to the reception amplifiers 804 and 805, respectively.
09 and power supply units 810 and 811 respectively, and the power supply system is configured to be independent for both branches. Hereinafter, this configuration is referred to as dual power feeding.

FIG. 9 shows another example of the configuration of a base station apparatus disclosed in Japanese Patent Application Laid-Open No. 8-279779. In this example, the power supply configuration is one branch to simplify the device configuration. 9, the same components as those in FIG. 8 are denoted by the same reference numerals. The base station indoor unit 901 includes one power supply unit 811 and a power superimposer 809, respectively, and supplies power to the base station outdoor unit 900 via the transmission line 817. Then, the base station outdoor unit 90
0 is one power separator 8 inserted in one signal line.
07 and a plurality of receiving amplifiers 804, 804,
805 is supplied with power. In the example of FIG. 9, the power supply system for the plurality of receiving amplifiers 804 and 805 has a one-branch configuration. Hereinafter, this configuration is referred to as single-system power supply.

[0005]

Conventionally, a base station apparatus for mobile communication is provided with a dedicated base station outdoor unit according to the above-mentioned prior art, for example, in correspondence with the configuration of single system power supply and dual system power supply. Was. For this reason, when installing a base station apparatus, two or more types of base station outdoor units are required so as to be able to cope with various cases such as new installation and expansion, and the mounting work becomes complicated and the cost of the apparatus is increased. There was a problem.

Further, in the above-described dual power supply configuration, when any one of the power supply unit, the power superimposer, the transmission line, and the power separator connected to one of the power supply systems fails, the power supply is stopped, and the diversity reception response is stopped. However, there is a problem that a failure (sector down) in which the operation becomes impossible occurs.

The present invention has been made in view of the above circumstances, and a first object of the present invention is to provide a mobile communication base station apparatus capable of coping with both single-system power supply and dual-system power supply. is there. The second purpose is to supply power to both systems.
An object of the present invention is to provide a mobile communication base station apparatus that does not cause a sector down even when a failure occurs in one power supply system.

[0008]

The present invention firstly comprises a base station indoor unit, a base station outdoor unit, a plurality of transmission lines connecting these, and a plurality of receiving systems. A base station device for mobile communication, wherein the indoor unit of the base station includes a power supply unit and a power superimposing unit that superimposes supply power output from the power supply unit on a plurality of transmission lines of the reception system. The base station outdoor unit includes a reception amplifier interposed in each of the plurality of reception systems, a plurality of power separators that respectively separate supply power superimposed on the plurality of transmission lines, and a power supply to the reception amplifier. A power switching unit that switches a supply path, wherein the power switching unit selects one of the outputs of the plurality of power separators and supplies power to the reception amplifier.

[0009] Second, the base station indoor unit includes a plurality of power supply units and a plurality of power superimposers for superimposing supply power output from these power supply units on a plurality of transmission lines of the reception system, respectively. And characterized in that:

Third, the indoor unit of the base station includes one power supply unit and a plurality of power superimposers for superimposing supply power output from the power supply unit on a plurality of transmission lines of the reception system. It is characterized by having.

[0011] With the above configuration, it is possible to cope with both single-system power supply and dual-system power supply of the base station apparatus without special settings by a simple configuration, thereby reducing equipment cost and simplifying installation workability. Can be achieved. In addition, even when a failure occurs in one of the power supply systems during the two-system power supply and the system enters a single-system power supply state, power supply can be continued without any problem.
It is possible to reduce the occurrence of troubles such as the inability to cope with diversity reception due to the sector down of the receiving system.

Fourthly, an overcurrent limiting circuit having a function of stopping power supply when a predetermined current or more flows is arranged between the power switching unit in the base station outdoor unit and the receiving amplifier. It is characterized by the following.

In the above configuration, even if a power supply short-circuit fault occurs in the receiving amplifier due to the overcurrent limiting circuit, only branch down is required, and sector down can be prevented, so that reliability is improved.

Fifth, the power switching section of the base station outdoor section has a switching function of switching an input under a predetermined voltage condition, and the power switching section of the base station indoor section has a switching function of the current output from the power supply section. A current monitoring circuit for monitoring a state is provided.

Sixthly, in the fifth configuration, there is provided an over-current switch having a function of stopping power supply between the power switching section having the switching function and the receiving amplifier when a predetermined current or more flows. A current limiting circuit is provided.

In the above configuration, it is possible to cope with both the single-system power supply and the dual-system power supply. In addition, when a failure occurs in one of the power supply systems during the dual-system power supply, the single-system power supply state occurs. Power supply can be continued without any problem. In addition, the power supply state is monitored by the overcurrent limiting circuit, so that failure detection and current interruption and notification when an abnormality occurs can be performed.

Also, the present invention provides, in a seventh aspect, a base station indoor unit;
A base station outdoor unit, having a plurality of transmission lines connecting them, a mobile communication base station device comprising a plurality of receiving systems, the base station indoor unit, one power supply unit ,
A plurality of power superimposers for superimposing supply power output from the power supply unit on a plurality of transmission lines of the reception system, wherein the base station outdoor unit includes a reception amplifier inserted in each of the plurality of reception systems. And a plurality of power separators for respectively separating the supply power superimposed on the plurality of transmission lines, and a power supply when a predetermined or more current flows between the reception amplifier and the power separator. And an overcurrent limiting circuit having a function of stopping.

In the above-described configuration, it is possible to cope with both single-system power supply and dual-system power supply without special settings, and it is possible to supply power to a plurality of reception systems with one power supply unit. There is no need to provide a power supply unit for each receiving system, and the number of power supply units can be reduced and the power switching unit can be omitted, so that the device configuration can be simplified and costs can be reduced.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIG. 1 is a block diagram showing a configuration of a base station apparatus according to a first embodiment of the present invention.

The base station apparatus includes antennas 118 and 119,
It has a base station outdoor unit 100 and a base station indoor unit 101, and the base station outdoor unit 100 and the base station indoor unit 101 are connected by transmission lines 116, 117 and 120. This base station apparatus includes two systems of receiving units for performing diversity reception. The base station outdoor unit 100
It has an antenna duplexer 102, a reception bandpass filter 103, reception amplifiers 104 and 105, and power separators 106 and 107 interposed in a signal line.
Power switching units 112 and 113 connected between the power separators 4 and 105 and the power separators 106 and 107, respectively. In addition, the base station indoor unit 101 includes a power superimposer 108,
109 and power supply units 110 and 111.

A transmission signal TX output from a transmission circuit (not shown) is transmitted from the indoor unit 101 of the base station via the transmission line 120 to the outdoor unit 100 of the base station, and transmitted from the antenna 118 via the antenna duplexer 102. . A reception signal received by one antenna 118 is amplified by a reception amplifier 104 through an antenna duplexer 102, passes through a power separator 106, is transmitted from a base station outdoor unit 100 by a transmission line 116, and is transmitted by a base station indoor unit. Sent to 101,
The signal is input as a received signal RX1 to a receiving circuit (not shown) via the power superimposer 108. Also, the other antenna 119
Is received by the reception bandpass filter 103
And is amplified by the receiving amplifier 105 through the
After that, the signal is transmitted from the base station outdoor unit 100 via the transmission line 117 and sent to the base station indoor unit 101, and is input to the receiving circuit (not shown) as the received signal RX2 via the power superimposer 109.

In the base station apparatus having such a configuration, the electric power supplied from the power supply units 110 and 111 of the indoor unit 101 of the base station are superimposed on the signal lines by the power superimposing units 108 and 109, respectively. Is supplied to the base station outdoor unit 100 via the. Base station outdoor unit 100
Then, the supplied power is divided into power separators 106 and 1 respectively.
07, the signal is separated from the signal line and supplied to the power switching units 112 and 113, respectively. Power switching unit 112,
113 selects one of the power separators 106 and 107 and supplies power to the reception amplifiers 104 and 105.

FIG. 6 shows an example of the circuit configuration of the power switching units 112 and 113. In the figure, a power switching unit 112 (113) is composed of diodes 114 and 115, and a power source A terminal and a power source B terminal on the anode side are connected to the power separators 106 and 107, respectively, and the cathode side is commonly connected. The output terminal is connected to the receiving amplifier 104 (105). Next, the operation of the power switching unit 112 (113) having such a configuration will be described.

In the case of single-system power supply, the power separators 106, 1
Power is output from only one of the power supplies 07 (state in which there is a voltage). Therefore, the power switching unit 11
2 and 113, one diode 114 connected to the power separator 106 (107) having the output voltage.
(115) conducts in the forward direction, and power is supplied to both the receiving amplifiers 104 and 105 via the output terminal.
At this time, the power separator 107 (10
The other diode 115 (114) connected to 6) is biased in the reverse direction, and is turned off.

In the case of a dual power supply, the power separators 106, 1
07 is in a state where power is being output from both of them. Accordingly, the power switching unit 112 (113) is configured such that one of the diodes 114 (115) connected to the power separator 106 (107) having the higher output voltage conducts in the forward direction, and the receiving amplifier is connected via the output terminal. Power is supplied to 104 and 105. On the other hand, the power separator 107 having the lower voltage
(106) and the other diode 115 (11
4) is biased in the reverse direction to be in the cutoff state.

When power is supplied to both power systems, one of the power separators 106 (1) is disconnected due to a failure in one of a power supply unit, a power superimposer, a transmission line, and a power separator connected to one of the power supply systems.
07), when the output voltage is reduced to be in a single-system power supply state, the power switching units 112 and 11 connected thereto are connected.
The diode 114 (115) constituting No. 3 is turned off. However, the diode 115 (11) connected to the other power separator 107 (106) without a drop in output voltage.
4) maintains conduction, and the receiving amplifier 10 is connected via the output terminal.
Electric power supply is continued without any trouble to both 4, 105.

As described above, in the first embodiment of the present invention, it is possible to cope with both the single-system power supply and the dual-system power supply of the base station apparatus with a simple configuration without special settings. . In addition, when a failure occurs in one of the power supply systems during the two-system power supply and the system enters a single-system power supply state,
Power supply can be continued without any trouble. As a result, it is possible to reduce the apparatus cost and simplify the installation workability, and a large obstacle (sector down) in which the operation of one system of the receiving unit is stopped at the time of a power supply failure and it becomes impossible to cope with diversity reception. Can be reduced.

In the first embodiment, the configuration of the base station apparatus having two systems of receiving units has been described. However, a similar effect can be obtained with a configuration of three or more systems.

Further, although the power switching units 112 and 113 are shown as independent components, the same functions are performed by the reception amplifiers 104 and 105 or the power separators 106 and 10.
The same effect can be obtained with the configuration included in FIG. That is, as long as it has the same function as the illustrated configuration,
The hardware configuration and the like can be arbitrarily designed according to various conditions.

[Second Embodiment] FIG. 2 is a block diagram showing a configuration of a base station apparatus according to a second embodiment of the present invention.
The second embodiment is an example in which an overcurrent limiting circuit is provided in the outdoor part of the base station according to the first embodiment. The same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

The base station outdoor unit 200 includes, in addition to the base station outdoor unit 100 shown in FIG. 1, the receiving amplifier 104 and the power switching unit 112, and the receiving amplifier 105 and the power switching unit 11
3, an overcurrent limiting circuit 202 having a function of stopping supply of power when a predetermined current or more flows.
203 are arranged. The base station indoor unit 201 is the same as in the first embodiment.

Here, in the configuration of the first embodiment, a case where a power supply short circuit occurs in one of the receiving amplifiers 104 and 105 in the base station outdoor unit 100 will be considered. In this case, the failed receiving amplifier 104 (10
5) of the power switching unit 112 (113) connected to
Both the diodes 114 and 115 in FIG. 6 are conducting, and the voltage on the anode side is substantially 0 (ignoring the forward voltage drop of the diode). Thereby, the other power switching unit 113 whose anode side is connected in parallel
The output voltage also does not appear at (112), and power cannot be supplied to the connected receiving amplifier 105 (104), so that operation stops and sector down occurs.

On the other hand, in the configuration of the second embodiment, one of the receiving amplifiers 104 of the base station outdoor unit 200
When the power supply short circuit occurs in (105), the overcurrent limiting circuit 202 (203) connected to the failed receiving system functions to cut off the current. As a result, the diodes 114 and 115 in FIG. 6 of the power switching unit 112 (113) connected to the failed receiving system are both turned off, so that the other power switching unit 113 (112)
Operates normally without being affected by both single-system power supply and dual-system power supply even though the anode side is connected in parallel, and the other amplifier 105 (104)
The power supply can be continued without any trouble. That is, even if a power supply short circuit occurs in one of the receiving amplifiers 104 and 105, only branch down is required, and sector down can be prevented.

As described above, in the second embodiment, in addition to the effect of the first embodiment, even if a power supply short-circuit fault occurs in one of the receiving amplifiers, the sector does not go down and the reliability is improved. It has an excellent effect that it can be improved.

[Third Embodiment] FIG. 3 is a block diagram showing a configuration of a base station apparatus according to a third embodiment of the present invention.
The third embodiment is an example in which a current monitoring circuit is provided inside the base station indoors of the first embodiment described above. The same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

The base station outdoor unit 300 is located at a position corresponding to the power switching units 112 and 113 in the base station outdoor unit 100 of FIG.
2,303 are arranged. Also, in the base station indoor unit 301, when the current consumption of the power source changes from a preset value, the current monitoring circuits 304 and 305 that detect the power consumption and shut off the current and generate an abnormal signal are detected. 108 and the power supply unit 110 and between the power superposition unit 109 and the power supply unit 111. Further, an abnormality display circuit 306 is connected to the current monitoring circuits 304 and 305.

Here, the configuration of the power switching units 302 and 303 having a switching function will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 7A illustrates a model of the configuration of the power switching unit. The contact switches according to the voltage applied between the terminal B and the terminal C, and the terminal A
Voltage appears on the display.

FIG. 7 shows an example of a circuit configuration corresponding to FIG.
(B). In this figure, reference numeral 307 is an FET,
308 and 309 are diodes, and 310 is a resistor. F
From the well-known characteristics of ET, when the voltage of the terminal C with respect to the terminal B (the voltage between the gate and the source) is lower than the cutoff voltage, the drain current of the FET flows and the voltage of the terminal B appears at the terminal A (the diode 308 is ignored). On the other hand, when the voltage of the terminal C with respect to the terminal B is higher than the cutoff voltage, the FET becomes nonconductive and the voltage of the terminal C appears at the terminal A. Therefore, the voltage appears at the terminal A in accordance with the difference between the voltage at the terminal B and the voltage at the terminal C in either the single system power supply or the dual system power supply. Further, when a failure occurs in one of the systems during operation with both systems of power supply, the system automatically enters a single system power supply state.

The operation of the base station apparatus configured as described above will be described. In the case of single system power supply, by setting the current set value of the current monitoring circuit 304 or 305 connected to the power supply system to the total value of the current consumption of the reception amplifiers 104 and 105, overcurrent or shortage during operation. When a current state is detected, this is detected, the current is cut off, and an abnormality detection signal is sent to the abnormality display circuit 306. Then, the abnormality display circuit 306 lights this abnormal state with a lamp,
Notify by displaying characters or images. Further, the center that monitors and controls the base station device may be notified of the occurrence of the abnormality.

In the case of both systems, the power separators 106 and 10
7 has a switching function so that the output from the receiver 7 enters the receiving amplifiers 104 and 105, respectively.
303 is set as an initial state, and the current setting values of the current monitoring circuits 304 and 305 are respectively set to the receiving amplifier 10.
The current consumption is 4,105. As a result, the current monitoring circuits 304 and 305 monitor the current of each operating power supply system, and when an abnormality occurs, detect the abnormality and cut off the current, and send an abnormality detection signal to the abnormality display circuit 306.

As described above, in the third embodiment,
By providing a power switching unit having a switch function, it is possible to cope with both single-system power supply and dual-system power supply as in the first embodiment, and by further providing a current monitoring circuit, the power supply state is reduced. By monitoring, it is possible to detect a failure and interrupt and notify the current when an abnormality occurs. In addition, even when a failure occurs in one of the power supply systems during the two-system power supply and the system enters a single-system power supply state, power supply can be continued without any problem.

[Fourth Embodiment] FIG. 4 is a block diagram showing a configuration of a base station apparatus according to a fourth embodiment of the present invention.
The fourth embodiment is an example in which an overcurrent limiting circuit is provided in a base station outdoor unit in addition to the configuration of the third embodiment described above.
The same components as those in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted.

The base station outdoor unit 400 includes, in addition to the base station outdoor unit 300 shown in FIG. 3, a reception amplifier 104, a power switching unit 302 having a switching function, and a reception amplifier 105.
And overcurrent limiting circuits 202 and 203 having a function of stopping power supply when a predetermined current or more flows, between each of the power switching units 303 having a switching function. The base station indoor unit 401 is the same as in the third embodiment.

With such a configuration, in the fourth embodiment, the effects based on the first to third embodiments can be simultaneously obtained. That is, it is possible to cope with both single-system power supply and dual-system power supply in the outdoor part of the base station, and even if a power supply short-circuit fault occurs in one of the receiving amplifiers, the sector does not go down. Furthermore, there is an effect that a failure can be detected by monitoring the current of the power supply system.

[Fifth Embodiment] FIG. 5 is a block diagram showing a configuration of a base station apparatus according to a fifth embodiment of the present invention.
The fifth embodiment is an example in which the power supply unit in the base station indoor unit is reduced to one and the power switching unit in the base station outdoor unit is removed from the configuration of the second embodiment described above. The same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted.

The base station outdoor unit 500 includes a power switching unit 112, 1 provided in the base station outdoor unit 200 shown in FIG.
13 is deleted, and overcurrent limiting circuits 202 and 203 are connected to the power separators 106 and 107, respectively. Also, one power supply unit 502 is arranged in the base station indoor unit 501, and is configured to supply power commonly to the power superimposers 108 and 109 of each signal line. Here, the power supply unit 5
The current capacity of 02 is the maximum capacity that can support both single-system power supply and dual-system power supply.

In the base station apparatus of the fifth embodiment, since one power supply unit 502 supplies power to both power supply systems, a reverse flow of current from one power supply system to the other power supply system is considered. This eliminates the necessity, and the power switching units 112 and 113 provided in the second embodiment can be omitted.

With such a configuration, as in the first to fourth embodiments, it is possible to cope with both single-system power supply and dual-system power supply without special settings, and to show in each of the above embodiments. Since a power supply unit is not required for each receiving system as described above, the apparatus configuration can be simplified and the cost can be reduced.

As described above, according to the present embodiment,
By providing a power switching unit for selecting any one of the plurality of power separators and connecting to the receiving amplifier in the base station outdoor unit, it is possible to cope with both single-system power supply and dual-system power supply.

By arranging an overcurrent limiting circuit between the receiving amplifier and the power switching unit in the base station outdoor unit, it is possible to cope with both single-system power supply and dual-system power supply, Even when a power supply short-circuit fault occurs in one of the amplifiers, it is possible to prevent a sector down from occurring.

In the outdoor part of the base station, there is provided a power switching part having a switching function between the receiving amplifier and the power separator of each power supply system, and the power superposition part and the power supply part of each system in the indoor part of the base station. By arranging the current monitoring circuit between them, a failure of the receiving amplifier can be detected.

Further, in addition to the above configuration, by disposing an overcurrent limiting circuit between the receiving amplifier of each power supply system and the power switching unit having a switching function in the base station outdoor unit, the single system power supply and the two system In addition to being able to cope with any case of power supply, it is possible to prevent a sector down even when a power supply short-circuit fault occurs in one of the receiving amplifiers.

By providing one power supply unit for supplying power commonly to each power supply system in the base station indoor unit, it is possible to cope with both single-system power supply and dual-system power supply, and to perform power switching. It is possible to obtain a base station apparatus whose configuration is simplified by omitting the unit, and it is possible to reduce the cost.

[0054]

As described above, according to the present invention, there is an effect that a mobile communication base station apparatus which can cope with both single-system power supply and dual-system power supply can be provided. In addition, there is an effect that it is possible to provide a mobile communication base station apparatus capable of preventing a sector down even when a failure occurs in one of the power supply systems during power supply to both systems.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a base station device according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a base station device according to a second embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a base station device according to a third embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a base station device according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration of a base station device according to a fifth embodiment of the present invention.

FIG. 6 is a circuit diagram illustrating an example of a circuit configuration of a power switching unit in FIG. 1;

FIGS. 7A and 7B are diagrams illustrating a configuration example of a power switching unit having a switching function of FIG. 3, wherein FIG. 7A is a schematic configuration diagram and FIG. 7B is a circuit configuration diagram.

FIG. 8 is a configuration diagram illustrating an example of a base station device according to the related art.

FIG. 9 is a configuration diagram showing another example of a base station device according to the related art.

[Explanation of symbols]

100, 200, 300, 400, 500 Base station outdoor unit 101, 201, 301, 401, 501 Base station indoor unit 102 Antenna duplexer 103 Receive bandpass filter 104, 105 Receive amplifier 106, 107 Power separator 108, 109 Power Superimposers 110, 111, 502 Power supply units 112, 113 Power switching units 116, 117, 120 Transmission lines 202, 203 Overcurrent limiting circuits 302, 303 Power switching units having a switching function 304, 305 Current monitoring circuits 306 Abnormality display units

Continued on the front page F term (reference) 5J021 AA06 CA06 DB04 EA04 FA17 FA20 FA26 FA29 FA30 FA31 FA32 5K046 CC17 CC18 PP01 PS05 PS22 PS41 ZZ01 ZZ15 5K067 EE10 KK05 LL01

Claims (7)

[Claims] 1. A mobile communication base station device comprising: a base station indoor unit, a base station outdoor unit, and a plurality of transmission lines connecting these units, and comprising a plurality of receiving systems. The base station indoor unit includes a power supply unit, and a power superimposing unit that superimposes a supply power output from the power supply unit on a plurality of transmission lines of the reception system, wherein the base station outdoor unit includes the plurality of reception systems. And a power switching unit that switches a power supply path to the reception amplifier, and a plurality of power separators that respectively separate supply power superimposed on the plurality of transmission lines. The mobile communication base station apparatus, wherein the power switching unit selects one of the outputs of the plurality of power separators and supplies power to the reception amplifier. 2. The base station indoor unit, comprising: a plurality of power units;
The mobile communication base station apparatus according to claim 1, further comprising: a plurality of power superimposers for superimposing supply power output from the power supply units on a plurality of transmission lines of the reception system. 3. The indoor unit of the base station includes one power supply unit,
The mobile communication base station apparatus according to claim 1, further comprising: a plurality of power superimposers for superimposing supply power output from the power supply unit on a plurality of transmission lines of the reception system. 4. An overcurrent limiting circuit having a function of stopping power supply when a predetermined current or more flows between a power switching unit and a receiving amplifier in the outdoor unit of the base station. The mobile communication base station apparatus according to any one of claims 1 to 3. 5. The power switching unit of the base station outdoor unit has a switch function of switching an input according to a predetermined voltage condition, and monitors a state of a current output from the power supply unit to the base station indoor unit. The mobile communication base station device according to any one of claims 1 to 4, further comprising a current monitoring circuit. 6. An overcurrent limiting circuit having a function of stopping power supply when a predetermined current or more flows between the power switching unit having the switching function and the reception amplifier. The mobile communication base station apparatus according to claim 5, wherein 7. A mobile communication base station apparatus comprising: a base station indoor unit, a base station outdoor unit, and a plurality of transmission lines connecting these, and comprising a plurality of receiving systems. The base station indoor unit includes one power supply unit and a plurality of power superimposers that superimpose supply power output from the power supply unit on a plurality of transmission lines of the reception system. A reception amplifier inserted in each of a plurality of reception systems, a plurality of power separators for respectively separating supply power superimposed on the plurality of transmission lines, and a power amplifier disposed between the reception amplifier and the power separator. A mobile communication base station apparatus comprising: an overcurrent limiting circuit having a function of stopping power supply when a predetermined current or more flows.