JP2002223168A - Transmission power control method and transmission power controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission power controller that controls a transmission power to a specified level when a device fails so as to prevent interference with other channel. SOLUTION: A control section 50a calculates respective attenuations including 2-way propagation losses on the basis of transmission power information and reception power information of an opposite station (station B) and reception power information and transmission power information of its own station (station A) to obtain a level difference, judges whether a fault resides in a propagation path or in a device on the basis of the level difference, increases the transmission power corresponding to the reduction in the reception power of its own station or the opposite station in the case of a fault of a propagation path with a small level difference and forcibly fixes the transmission power of its own station and the opposite station to a specified transmission power in the case of a device fault with a large level difference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission power control method and a transmission power control device in a radio communication system, and more particularly, to a transmission path control method in which a local station and a remote station monitor both transmission power and reception power to determine whether a propagation path fault occurs. The present invention relates to a transmission power control method and a transmission power control device for forcibly controlling transmission power to a predetermined transmission power when it is determined that an equipment failure has occurred and reception power has decreased and, in the event of a device failure, transmission power has been forcibly controlled.

[0002]

2. Description of the Related Art Conventionally, in this type of transmission power control apparatus,
The own station controls the transmission power in response to a decrease in the reception power due to weather conditions such as fading in radio wave propagation in the microwave band when the radio wave is received by the partner station, for example, by controlling the transmission power in the partner station. , A decrease in received power is prevented and a deterioration in signal quality is avoided.

In recent years, when rainfall or selective fading occurs, controlling transmission power not only prevents signal quality deterioration due to spatial propagation loss, but also prevents rainfall and fading. At steady state,
By reducing the transmission power to such an extent that the signal quality does not deteriorate, such as to reduce interference with other adjacent transmission signals or to prevent signal quality deterioration due to nonlinear distortion of the transmission unit,
There is a need for transmission power control that achieves improved line quality and lower power consumption.

[0004] There are roughly two types of transmission power control systems. One is a method for controlling the transmission power based on the reception power of the own station, and the other is a method for controlling the transmission power based on the reception power information transmitted from the partner station. In both cases, if a failure occurs such that the receiving system decreases with respect to the required gain, the propagation loss is increased, and the transmission power is increased. There is a problem that signal quality is degraded due to nonlinear distortion. Further, the latter method of controlling the transmission power based on the reception power information transmitted from the other station, the signal quality is deteriorated while the reception electric field of the own station remains low because the transmission unit of the other station is not controlled normally. There was a problem that occurs.

[0005]

The above-described conventional transmission power control apparatus increases the transmission power on the assumption that the propagation loss increases when a failure occurs such that the reception system falls below a required gain. By doing so, there is a disadvantage that signal quality is degraded due to interference with adjacent other transmission signals and nonlinear distortion of the transmission power amplifier.

Further, in the case of a system for controlling the transmission power of the own station based on the reception power information transmitted from the partner station,
Since the transmitting unit of the partner station is not controlled normally, there is a disadvantage that the signal quality is deteriorated while the receiving electric field of the own station is kept lowered.

[0007] An object of the present invention is to eliminate such a drawback in the prior art by monitoring the transmission power and the reception power at the own station and the opposite station, respectively, to judge whether a propagation path failure or equipment failure has occurred. An object of the present invention is to provide a transmission power control device that forcibly controls transmission power to a predetermined transmission power in the event of a device failure when reception power decreases.

[0008]

SUMMARY OF THE INVENTION A transmission power control method according to the present invention is a transmission power control method for controlling transmission power based on the reception power of a local station or a partner station. Monitor the received power and determine whether the propagation path failure or equipment failure based on the monitoring information.If the received power of the local station or the partner station decreases, in the case of a propagation path failure, the local station or partner station The transmission power is increased in accordance with the decrease in the reception power of the own station or the partner station, and in the case of a device failure, the own station and the partner station perform control to forcibly fix the transmission power to the predetermined transmission power. It is characterized by:

Further, a transmission power control method according to the present invention is a transmission power control method for controlling the transmission power of its own station based on the reception power of a partner station. Monitor, calculate the amount of attenuation including the propagation loss in both directions based on the monitoring information, obtain the level difference, and determine whether the propagation path failure or the equipment failure based on the respective change speed of the attenuation amount or the level difference. When the reception power of the partner station decreases, in the case of a propagation path failure where the level difference is small, the own station increases the transmission power in accordance with the reduction of the reception power of the partner station, and the level difference is large. In the case of a device failure, it is characterized in that the own station and the partner station perform control for forcibly fixing the transmission power to a predetermined transmission power.

A transmission power control method according to the present invention is a transmission power control method for controlling the transmission power of the own station based on the reception power of the own station. Monitor, calculate the amount of attenuation including the propagation loss in both directions based on the monitoring information, obtain the level difference, and determine whether the propagation path failure or the equipment failure based on the respective change speed of the attenuation amount or the level difference. When the reception power of the own station is reduced, and the level difference is small, in the case of a propagation path failure, the transmission power is adjusted according to the reduction of the reception power of the own station after the own station is fixed for a predetermined time. In the case of a device failure in which the level difference increases in a stepwise manner and the level difference is large, the own station and the partner station perform control for forcibly fixing the transmission power to the predetermined transmission power.

A transmission power control apparatus according to the present invention is a transmission power control apparatus for controlling transmission power based on the reception power of a local station or a partner station, and comprises an ATPC including transmission power information and reception power information of a partner station. A receiving unit that receives a control signal and outputs a reception power monitor signal of the own station, a demodulation unit that demodulates the output of the reception unit, and reception power information of the own station converted from the reception power monitor signal of the own station or the A control unit that outputs a transmission power control signal that increases transmission power when the reception power of the own station or the other station is reduced based on the reception power information of the other station extracted from the demodulation unit output,
A modulation unit that takes in the transmission power information of the own station and the reception power information of the own station generated by the control unit and outputs an ATPC control signal; and converts the output of the modulation unit into a transmission signal, and then outputs the transmission power control signal. A transmission unit that amplifies and outputs the transmission power information and reception power information of the partner station and the transmission power information of the own station and the reception power information of the own station. Determine whether a device failure, when a decrease in the reception power of the own station or the partner station occurs, in the case of a propagation path failure, increase the transmission power according to the decrease in the reception power of the own station or the partner station. A transmission power control signal is output, and in the case of a device failure, the transmission power control signal for fixing the transmission power to a predetermined transmission power is output to the transmission unit, and a forced control signal for notifying the other station is output. age There.

[0012] Further, the control unit determines an attenuation amount including a bidirectional propagation loss based on the transmission power information and the reception power information of the partner station and the transmission power information of the own station and the reception power information of the own station. Each of them is calculated to obtain a level difference, and when the level difference is within a predetermined value range, a propagation path failure is determined, and when the level difference exceeds a predetermined value range, a device failure is determined.

[0013] Further, the control unit determines an attenuation amount including a bidirectional propagation loss based on the transmission power information and the reception power information of the partner station and the transmission power information of the own station and the reception power information of the own station. It is characterized by calculating and monitoring each temporal change, and when the temporal change is slow, a propagation path failure is determined, and when the temporal change is early, a device failure is determined.

The control unit outputs the transmission power control signal for increasing the transmission power to the transmission unit when the reception power of the partner station is reduced and in the case of a propagation path failure,
In the case of a device failure, outputting the transmission power control signal for fixing the transmission power to a predetermined transmission power to the transmission unit, and simultaneously outputting a compulsory control signal for notifying a partner station to the modulation unit. It is characterized by.

[0015] Further, when the reception power of the own station is reduced, and in the case of a propagation path failure, the control unit fixes the transmission power of the own station for a preset time and then reduces the transmission power of the own station. Outputs the transmission power control signal that increases stepwise as the power decreases, and in the case of a device failure, outputs the transmission power control signal that fixes the transmission power to a predetermined transmission power for the transmission unit. , And simultaneously outputs a compulsory control signal to be notified to the other station to the modulation section.

[0016]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the transmission power control device of the present invention.

In the present embodiment shown in FIG. 1, in station A, a modulating section (MOD-ENC) 10a, a transmitting section (TX) 20a,
Receiver (RX) 30a, Demodulator (DEM-DEC) 40
and a control unit (ATPC CONT) 50a. At the B station, a modulation unit (MOD-ENC) 10b, a transmission unit (TX) 20b, a reception unit (RX) 30b, and a demodulation unit (D
EM-DEC) 40b and control unit (ATPC CON)
T) 50b. Reference numeral 60a denotes an A station antenna, and 60b denotes a B station antenna.

Next, the operation of the transmission power control apparatus according to the present embodiment will be described in detail with reference to FIG. 1 and FIG. FIG.
FIG. 2 is a block diagram illustrating a configuration of a control unit illustrated in FIG. 1.
In FIG. 1, the stations A and B have the same configuration, and the following description will be made with the station A as its own station and the station B as the partner station.

Referring to FIG. 1, first, station B monitors the received power from station A, and receives the received power monitor voltage (RPWR MON-B) output from receiving section 30b by control section 50b to receive power information (RPWR). DATA-B).
In addition, the control unit 50b generates transmission power information (TPWR DATA-B) based on the reception power of the station A or the station B, converts the transmission power information into a transmission power control signal (TPWR CONT-B), and controls the transmission power. Then, the transmission power information (T
PWR DATA-B) and received power information (RPWR)
DATA-B) is converted into transmission data by the modulator 10b, and transmitted to the A station via the transmitter 20b as an ATPC control signal.

The station A demodulates the ATPC control signal received from the station B by the demodulation section 40a, and then extracts the transmission power information (TPWR DATA-B) and the reception power information (RPWR DATA-B) by the control section 50a. Further, the control unit 50a uses the received power monitor voltage (RPWR MON-A) output from the receiving unit 30a as received power information (RPW MON-A).
R DATA-A), and either station A or B
Transmission power information (TPWR DA based on the reception power of the station)
TA-A), and a transmission power control signal (TPWR CONT-
A) is output and supplied to, for example, a variable attenuator of the transmission unit 20a to perform transmission power control.

Station A transmits its own transmission power information (TPW
R DATA-A) and received power information (RPWR D
ATA-A) is converted into transmission data by the modulator 10a, and A
The signal is transmitted as a TPC control signal to the B station via the transmission unit 20a.

In this way, the stations A and B can perform transmission power control on the basis of mutual reception power information.

Next, the operation of the transmission power control based on the configuration of the control unit will be described.

According to FIG. 2, the control unit 50a controls the CONV5
1a, DATA CONV52a, DATA CONV
53a, COMP & TIMER (comparator) 54a, TP
WRCONT (Transmission Power Controller) 55a and CONV
The transmission power of the station A is controlled based on the reception power information (RPWR DATA-B) of the station B extracted via the demodulation unit 40a.

The CONV 51a converts the reception power monitor voltage (RPWR MON-A) at the station A output from the receiver 30a monitoring the reception power from the station B into reception power information (RPWR DATA-A). Output.

The DATA CONV 52a is connected to the demodulation unit 40
a transmission power information (TPWR DATA-B) and reception power information (R
PWR DATA-B).

The DATA CONV 53a converts the transmission power information (TPWR DATA-A) and the reception power information (RPWR DATA-A) of the station A into data, and outputs the converted data to the modulator 10a.

COMP & TIMER 54a is a DATA
Transmission power information (TPWR DATA-B) and reception power information (RP) of station B output from CONV 52a.
WRDATA-B), station A's received power information (RPWR DATA-A) output from the CONV 51a, and station A's transmission power information (TPWR DATA-A) output from the TPWR CONT 55a, and the transmission direction ( Attenuation amount including propagation loss from station A to station B (| TPWR
DATA-A |-| RPWR DATA-B |),
Attenuation including propagation loss (| T
PWR DATA-B |-| RPWR DATA-A
|), And a level difference is obtained from the two attenuation amounts. If this level difference occurs beyond a predetermined range for a predetermined time or more, the transmitting unit 20a of the station A or the station B,
20b or the failure of the receiving units 30a and 30b,
A forced control signal (CONT SIG-A) for forcibly fixing the transmission power to the predetermined transmission power is transmitted. The forcible control signal (CONT SIG-A) forcibly sets the transmission power control signal (TPWR CONT-A) of the station A to a predetermined transmission power and sets the DATA CONV5.
It is output to notify the station B to 3a. Station B
When this forced control signal (CONT SIG-A) (corresponding to CONT SIG-B shown in FIG. 2) is detected,
Immediately, the transmission power control signal (TPWR CONT-B) is forcibly set to the predetermined transmission power.

The TPWR CONT 55a is a CONV5
Station 2 received power information (RPWR D
When ATA-B) falls below a predetermined threshold, the transmission power information (TPW) that increases the transmission power from the current transmission power.
R DATA-A). This control increases the transmission power of the transmission unit 20a by one step, for example, every 1 dB, up to the maximum set transmission power according to the reception power of the B station.
The propagation power decreases, the reception power of the station B increases, and the minimum power value is obtained when the reception power reaches a predetermined threshold.
Control is performed to reduce the transmission power of the transmission unit 20a for each step.

The CONV 56a is a TPWR CONT5
5a transmitted power information (TPWR DATA
-A) is the transmission power control signal (TPWR CONT-A)
The transmission power is controlled by controlling, for example, a variable attenuator of the transmission unit 20a.

Therefore, the control unit 50a compares the state of the bidirectional transmission path between the station A and the station B transmitting the same space to determine whether the propagation path failure or the equipment failure has occurred. If the reception power of station B decreases due to rainfall, etc.
By increasing the transmission power of the station A in accordance with the decrease in the reception power of the station, it is possible to prevent the signal quality from deteriorating due to the influence of thermal noise.

When the received power decreases due to equipment failure in a steady state without rainfall or fading, the stations A and B forcibly reduce the transmission power to the predetermined transmission power,
For example, by fixing the transmission power to the minimum transmission power, it is possible to prevent signal quality from deteriorating due to interference with other adjacent transmission signals and nonlinear distortion of the transmission power amplifier.

Next, the control of the transmission power according to the present embodiment will be described using a time chart. FIG. 3 is a time chart illustrating control of transmission power with respect to reduction of reception power due to rainfall. FIG. 4 is a time chart showing control of transmission power with respect to reduction of reception power due to selective fading. FIG. 5 is a time chart showing the control of the transmission power with respect to the reduction of the reception power due to the failure of the receiving unit of the station A.

In FIGS. 3, 4 and 5, the propagation loss is the amount of attenuation including the propagation loss of the transmission line, that is, the difference between the transmission power information and the reception power information. The direction in which the amount of attenuation increases with the direction in which the received power decreases with reference to the received power shown in FIG.

First, a description will be given of the control of the transmission power of the own station with respect to a decrease in the reception power of the partner station due to rainfall. FIG.
(A) is a time chart which shows the transmission power control of station A with respect to the reception power of station B accompanying the propagation loss. FIG.
(B) is a time chart showing the transmission power control of station B with respect to the reception power of station A accompanying the propagation loss. FIG.
(C) is a time chart showing a COMP (comparison) output.

In the case of rain, as shown in FIGS. 3 (a) and 3 (b), the station A,
The reception power of both stations decreases. Then, at the station A, when the reception power of the station B falls below the predetermined threshold value,
Control is performed so that the transmission power of the station A is increased, for example, every 1 dB according to the decrease in the reception power of the station B. Similarly, at the station B, when the reception power of the station A falls below the predetermined threshold,
Control is also performed to increase the transmission power of station B in increments of 1 dB in response to a decrease in the reception power of station A.

Here, COMP & TIMER 54a is
Propagation loss (| TPWR DA in the transmission direction (station A → station B)
TA-A |-| RPWR DATA-B |) and the propagation loss (| TPWR DATA-
B | − | RPWR DATA−A |), respectively, to obtain a difference between the two levels. The propagation loss due to rainfall is
Since there is almost no level difference in both directions, the level difference (COMP output) is almost 0, that is, 0 dB, as shown in FIG. From now on, COMP & TIMER5
4a outputs a control signal indicating normal operation (NORM). Based on this control signal, transmission power control is performed normally. That is, the stations A and B perform control to increase the transmission power to the maximum value according to the decrease in the reception power of each other. Further, when the propagation loss decreases and the reception power starts to increase, control is performed to reduce the transmission power in accordance with the mutual reception power increase.

Next, the control of the transmission power of the own station with respect to the decrease of the reception power of the partner station due to the selective fading will be described. FIG. 4A is a time chart illustrating the transmission power control of the station A with respect to the reception power of the station B due to the propagation loss. FIG. 4B is a time chart illustrating the transmission power control of the station B with respect to the reception power of the station A due to the propagation loss. FIG. 4C is a time chart showing a COMP (comparison) output.

As shown in FIG. 4A, the reception power of the station B is less affected by the selective fading and has some propagation loss, but does not fall below a predetermined threshold. Therefore, the transmission power of the station A remains controlled at the predetermined transmission power, for example, the minimum transmission power.

On the other hand, as shown in FIG. 4 (b), the reception power of the station A is greatly affected by the selective fading, and the reception power is reduced to be lower than the threshold value. Have been done.

Here, COMP & TIMER 54a is
Propagation loss (| TPWR DA in the transmission direction (station A → station B)
TA-A |-| RPWR DATA-B |) and the propagation loss (| TPWR DATA-
B | − | RPWR DATA−A |), respectively, to obtain a difference between the two levels. Due to the influence of the selective fading, as shown in FIG.
P output) becomes large, and it is determined that the device is out of order.

However, since selective fading is generally temporary, by setting an arbitrary duration (TIMER section), if the ALM detection section due to selective fading stops within the TIMER section, , COMP & TIMER 54a can output a control signal indicating a normal operation (NORM) in isolation from a device failure.

Next, the control of the transmission power of the own station with respect to the decrease of the reception power of the other station due to the failure of the receiving section of the own station will be described. FIG. 5A is a time chart illustrating the transmission power control of the station A with respect to the reception power of the station B due to the propagation loss. FIG. 5B is a time chart showing the transmission power control of the station B with respect to the reception power of the station A due to the propagation loss.
FIG. 3C is a time chart showing a COMP (comparison) output.

First, as shown in FIG. 5A, the reception power of the station B is stable without attenuation due to rainfall or fading, does not fall below a predetermined threshold value, and the transmission power of the station A is the minimum transmission power. Power is controlled.

Next, as shown in FIG. 5B, the station A in which the receiving unit 30a has failed has a lower received power and shows a lower value than the received power of the station B. At this time, since the reception power of the station A is equal to or less than the predetermined threshold, the station B performs control to increase the transmission power.

Here, COMP & TIMER 54a is
Propagation loss (| TPWR DA in the transmission direction (station A → station B)
TA-A |-| RPWR DATA-B |) and the propagation loss (| TPWR DATA-
B | − | RPWR DATA−A |), respectively, to obtain two level differences, the level difference (COMP
Output) clearly becomes large, so it is determined that the device is out of order. In the case of equipment failure, unlike fading, there are few temporary cases, and any duration (TIMER section)
Happens beyond. Based on this determination result, COMP & T
The IMER 54a controls the transmission power to a predetermined transmission power, for example, a minimum transmission power, by a forced control signal (CONT).
SIG-A) is output to the TPWR CONT 55a, and is also output to the DATA CONV 53a to control the transmission power of the station B to the minimum transmission power. Therefore,
The stations A and B can control the transmission power to the predetermined transmission power by the forced control signal (CONT SIG-A) output when the device failure is detected.

In the above description, the transmission power control of station A is
Although the case where the control is performed based on the reception power of the station B, the station A can also control the transmission power based on the reception power of the own station. FIG. 6 is a block diagram of the control unit when the station A performs transmission power control based on the reception power of the own station.

According to FIG. 6, COMP &
The TIMER 54a calculates the propagation loss (| TPWR DATA-A |-| RPWR DAT) in the transmission direction (station A → station B).
AB |) and the propagation loss (|
TPWR DATA-B |-| RPWR DATA-A
) Is the same, but the transmission power information (TPWR DATA-A) of the station A is generated from the reception power information (RPWR DATA-A) of the station A, and the reception power of the own station is reduced. The difference is that the transmission power is gradually increased accordingly.

Normally, a plurality of frequencies in the same frequency band and at regular intervals are used for transmission and reception between the stations A and B. As a result, there is a case where a method of controlling the transmission power of the A station based on the reception power of the own station is adopted, assuming that the propagation loss due to rainfall has a correlation regardless of the frequency. An advantage of this is that the configuration is simplified and it is possible to follow fast fading. However, simply controlling the transmission power of the A station based on the reception power of the own station does not control the transmission power of the B station normally, and the reception electric field of the A station is reduced, and the signal quality may deteriorate. is there.

FIG. 7 is a time chart in the case where station A performs transmission power control based on its own reception power. FIG.
(A) is a time chart showing transmission power control of station A with respect to reception power of station A accompanying propagation loss. FIG.
(B) is a time chart showing the transmission power control of station B with respect to the reception power of station B accompanying the propagation loss.

According to FIG. 7, the propagation loss increases due to rainfall and the like, and the received electric fields of the stations A and B both decrease. Then, the station A changes the transmission power from the minimum transmission power to 1 dB from the time when the reception power falls below the predetermined threshold.
Increase in units. The reception power of the station B decreases due to the rainfall, but the transmission power does not fall below the predetermined threshold value because the transmission power of the station A increases, so that the transmission power is kept at the minimum power. Even if the propagation loss increases,
Since the same operation is repeated, the transmission power of the station B remains controlled to the minimum power until the transmission power of the station A can be controlled. As a result, the reception electric field of the station A decreases, and the signal quality deteriorates due to the influence of thermal noise.

Here, COMP & TIMER 54a is
Propagation loss (| TPWR DA in the transmission direction (station A → station B)
TA-A |-| RPWR DATA-B |) and the propagation loss (| TPWR DATA-
B | − | RPWR DATA−A |), respectively, to obtain two level differences. When the A station detects a decrease in the reception power of its own station, if the level difference is a small propagation path failure, After fixing for a predetermined time, control is performed to increase the transmission power stepwise according to the decrease in the reception power.

This control is performed after increasing the transmission power by the station B by increasing the transmission power by increasing the transmission power by increasing the transmission power in a predetermined period of time. , Because station A increases the transmission power,
Only one of them can prevent the transmission power from increasing. When the propagation loss further increases, the same operation is performed, and only the station A can perform balanced control without increasing the transmission power. Therefore, it is possible to prevent a decrease in the reception power of the station A due to rainfall while following a change in fading, and to prevent a deterioration in signal quality at both the station A and the station B. On the other hand, in the case of a device failure having a large level difference, the stations A and B perform control to forcibly fix the transmission power to the predetermined transmission power, as described above.

Further, COMP & TIMER in the control section can be replaced by a CPU. FIG. 8 is a block diagram showing a configuration using a CPU for the control unit shown in FIG.

According to FIG. 8, the CPU 57a can quickly determine whether there is a propagation path failure or a device failure by monitoring the temporal change of the bidirectional propagation loss. In particular, in the case of selective fading, the reception power may decrease at a certain frequency due to the state of the propagation path, that is, at a resonance frequency (hereinafter referred to as “notch”). At this time, if the frequency of communication between the opposing devices is notched for a long time, the COMP & TIMER 54a determines that the device has failed if the alarm detection time (ALM detection section) is set long. However, by monitoring the temporal change of the propagation loss, the CPU 57a can determine in a short time the selectivity fading that gradually attenuates and the detection of a device failure in which the received power suddenly decreases at a certain time. .

[0056]

As described above, according to the transmission power control method and the transmission power control apparatus of the present invention, the transmission power and the reception power are monitored by the local station and the counter station, respectively, and a transmission path failure or equipment failure is detected. Judgment as to whether or not a failure has occurred, and when the received power has decreased, in the event of a device failure, forcibly controlling the transmission power to the predetermined transmission power can prevent interference with other lines due to the device failure. effective.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a transmission power control device of the present invention.

FIG. 2 is a block diagram showing a configuration of a control unit shown in FIG.

FIG. 3 is a time chart showing control of transmission power with respect to reduction of reception power due to rainfall.

FIG. 4 is a time chart showing control of transmission power with respect to reduction of reception power due to selective fading.

FIG. 5 is a time chart illustrating control of transmission power with respect to a decrease in reception power due to a failure of a receiving unit of the station A;

FIG. 6 is a block diagram of a control unit when station A performs transmission power control based on its own reception power.

FIG. 7 is a time chart in a case where the station A performs transmission power control based on the reception power of the own station.

FIG. 8 is a block diagram illustrating a configuration using a CPU for a control unit illustrated in FIG. 1;

[Explanation of symbols]

 10a, 10b Modulator (MOD-ENC) 20a, 20b Transmitter (TX) 30a, 30b Receiver (RX) 40a, 40b Demodulator (DEM-DEC) 50a, 50b Control (ATPC CONT) 60a, 60b Antenna 51a CONV 52a DATA CONV 53a DATA CONV 54a COMP & TIMER 55a TPWR CONT 56a CONV

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (8)

[Claims] 1. A transmission power control method for controlling transmission power based on the reception power of a local station or a partner station, wherein the transmission power and the reception power of the local station and the partner station are monitored, and a propagation path failure is monitored based on the monitoring information. Or a device failure, and when the reception power of the own station or the partner station decreases, in the case of a propagation path failure, the own station or the partner station responds to the decrease of the reception power of the own station or the partner station. Transmission power control method for increasing the transmission power and, in the event of a device failure, performing control for forcibly fixing the transmission power to the predetermined transmission power by the own station and the partner station. 2. A transmission power control method for controlling the transmission power of a self-station based on the reception power of a counterpart station, wherein the transmission power and the reception power of the self-station and the counterpart station are monitored, and a bidirectional communication is performed based on the monitoring information. The level difference is calculated by calculating the attenuation including the propagation loss, and it is determined whether the propagation path failure or the equipment failure is based on the change speed of the attenuation or the level difference. When this occurs, in the case of a propagation path failure with a small level difference, the own station increases the transmission power in accordance with a decrease in the reception power of the partner station. A transmission power control method in which a partner station forcibly fixes transmission power to a predetermined transmission power. 3. A transmission power control method for controlling the transmission power of the own station based on the reception power of the own station, wherein the transmission power and the reception power of the own station and the partner station are monitored, and a bidirectional communication is performed based on the monitoring information. Calculate the amount of attenuation including the propagation loss to determine the level difference, determine whether the propagation path failure or equipment failure based on the respective rate of change of the amount of attenuation or the level difference,
When a decrease in the reception power of the own station occurs, in the case of a propagation path failure in which the level difference is small, the transmission power is adjusted according to the decrease in the reception power of the own station after the own station fixes for a predetermined time. A transmission power control method characterized in that, in the case of a device failure that increases stepwise and the level difference is large, the own station and the partner station perform control to forcibly fix the transmission power to a predetermined transmission power. . 4. A transmission power control apparatus for controlling transmission power based on the reception power of a local station or a partner station, comprising: receiving an ATPC control signal including transmission power information and reception power information of a partner station; A receiving unit that outputs a reception power monitor signal, a demodulation unit that demodulates the reception unit output, and the reception power information of the own station converted from the reception power monitor signal of the own station or the partner station extracted from the output of the demodulation unit A control unit that outputs a transmission power control signal that increases the transmission power when the reception power of the own station or the partner station is reduced based on the reception power information of the own station, the transmission power information of the own station generated by the control unit, and AT that captures received power information of own station
A modulation unit that outputs a PC control signal; and a transmission unit that converts the output of the modulation unit into a transmission signal, and then amplifies and outputs the transmission signal based on the transmission power control signal. Information and the received power information and the transmission power information of the own station and the received power information of the own station to determine whether the propagation path failure or equipment failure, when the reception power of the own station or the partner station decreases, In the case of a propagation path failure, the transmission power control signal that increases the transmission power according to the decrease in the reception power of the own station or the partner station is output, and in the case of a device failure, the transmission power is fixed at a predetermined transmission power. The transmission power control device outputs the transmission power control signal to the transmission unit and outputs a compulsory control signal for notifying a partner station. 5. The control unit, according to the transmission power information and the reception power information of the partner station and the transmission power information of the own station and the reception power information of the own station, determines an attenuation amount including a bidirectional propagation loss. A level difference is calculated by each calculation, and when the level difference is within a predetermined value range, a propagation path failure is determined, and when the level difference exceeds a predetermined value range, a device failure is determined. Item 5. The transmission power control device according to item 4. 6. The controller according to claim 6, wherein the transmission power information and the reception power information of the partner station and the transmission power information of the own station and the reception power information of the own station determine an attenuation amount including a bidirectional propagation loss. Calculate and monitor changes over time,
5. The transmission power control device according to claim 4, wherein a propagation path failure is determined when the temporal change is slow, and a device failure is determined when the temporal change is early. 7. The control unit outputs the transmission power control signal to increase the transmission power to the transmission unit when the reception power of the partner station decreases and, in the case of a propagation path failure, causes a device failure. In the case of, the transmission unit outputs the transmission power control signal fixed to a predetermined transmission power, and simultaneously outputs a compulsory control signal to notify the other station to the modulation unit. Claim 4, 5 or 6
The transmission power control device according to claim 1. 8. When the reception power of the own station is reduced, and in the case of a propagation path failure, the control unit fixes the transmission power of the own station for a preset time, and then controls the reception power of the own station. Outputs the transmission power control signal that increases stepwise as the power decreases, and in the case of a device failure, outputs the transmission power control signal that fixes the transmission power to a predetermined transmission power for the transmission unit. 7. The transmission power control device according to claim 4, wherein a forced control signal to be notified to a partner station is simultaneously output to the modulation unit.