KR20070040642A - Apparatus and method for automatically controlling transmission power in base station of mobile communication system - Google Patents

Abstract

The present invention relates to an apparatus and method for automatically controlling transmission power of a mobile communication system base station. In the transmission power control apparatus of a mobile communication system base station, a set value for inputting various setting values for automatic execution of a TPTL An input unit; A transmission power detector for detecting power of a final transmission output; Periodically comparing whether the absolute value of the difference between the target power preset through the set value input unit and the detected power detected by the transmission power detection unit exceeds a preset threshold value, and the absolute value of the power difference is the threshold value Is exceeded for a predetermined time, characterized in that it comprises a base station controller for automatically performing TPTL for transmission power gain adjustment. By the above configuration, the present invention can adjust the intensity of the final transmission output of the base station within the power threshold value, it is possible to take immediate action in the event of a problem with the transmission power of the base station, by notifying the operator whether to perform automatic TPTL, the base station It is easy to grasp the abnormality of the transmission power, and it is possible to maintain the stable base station transmission output, thereby stably operating the mobile communication system.

TPTL, transmission power control, base station modem, base station controller, transmission power detection

Description

Apparatus and method for automatically controlling transmission power in base station of mobile communication system

1 is a block diagram showing the configuration of an automatic transmission power control apparatus of a mobile communication system base station according to an embodiment of the present invention.

2 is a flowchart illustrating an automatic transmission power control method of a mobile communication system base station according to an embodiment of the present invention.

3 is a state transition diagram for explaining the automatic transmission power control method of a mobile communication system base station according to an embodiment of the present invention.

Figure 4 is a block diagram showing the configuration of a transmission power control device of a conventional mobile communication system base station.

Explanation of symbols on the main parts of the drawings

10: base station transmission power control device 110: channel card

111: base station modem 112: overhead channel

114: traffic channel 116: first synthesizer

118: second synthesizer 120: up converter

130: amplification unit 140: transmission termination

150: base station controller 152: target power calculator

152: monitoring unit 156: power control unit

160: transmission power detection unit 170: set value input unit

The present invention relates to an apparatus and method for controlling automatic transmission power of a mobile communication system base station. In particular, the base station of the mobile communication system for a predetermined time the absolute value for the difference between the power of the transmission output and the target power is preset The present invention relates to an automatic transmission power control apparatus and method for a mobile communication system base station that can periodically monitor whether an excess is exceeded and automatically perform a transmit power tracking loop (TPTL) according to the result.

In general, the output of a base station may change with increasing or decreasing calls, but ideally it will not change over time with ambient temperature and time, but many active elements in the base station's transmission path will change the final output with changes in temperature and time. do.

In order to correct such output fluctuation, TPTL is used, which functions to maintain a constant strength of an overhead channel signal, which is a reference for base station transmission power control.

4 is a block diagram showing the configuration of a transmission power control apparatus of a conventional mobile communication system base station.

The base station transmission power control apparatus 40 includes a channel card 410 including a base station modem 411 for generating a channel signal, an up converter 420 for up-modulating the channel signal into a radio transmission band, and the up-modulation. An amplification unit 430 for amplifying the signal to a level suitable for wireless transmission, and a transmission end for wirelessly transmitting the amplified signal through a transmission antenna and coupling a portion of the signal to a transmission power detection unit 460 440, the base station controller 450 for adjusting the gain of the up-converter 420 by comparing the power detected by the transmission power detector 460 with a predetermined target power, and the transmission power for detecting the power of the transmission signal. The detector 460 and a set value input unit 470 for inputting the target power of the overhead.

The base station modem 411 of the channel card 410 includes an overhead channel 412 such as pilot, sync, paging, a plurality of traffic channels 414 for communication, a plurality of A first synthesizer 416 synthesizing the output of the traffic channel 414 and a second synthesizer 418 synthesizing the output of the first synthesizer 416 and the output of the overhead channel 412.

The base station controller 450 may generate the desired final transmission output based on the overhead target power input by the operator through the set value input unit 470 and the power of the traffic channel input from the first synthesizer 416 of the base station modem 411. Compare the target power input from the target power calculator 452 and the target power input from the target power calculator 452 with the target power calculator 452 that calculates the total target power for the target power. The power controller 454 adjusts the gain of the converter 420 to adjust the gain of the final transmission power.

Referring to the operation of the base station transmission power control device 40 having such a configuration, first, when the operator of the mobile communication system inputs the target power of the base station overhead through the set value input unit 470, the base station control unit 450 The target power calculator 452 calculates the total target power of the base station by adding the overhead target power and the power of the traffic channel input from the first synthesizer 416 of the base station modem 411 to calculate the total target power of the base station. Will output

The power control unit 454 of the base station control unit 450 performs a total of the base station transmission total target power input from the target power calculation unit 452 and the base station transmission final output detected by the transmission power detection unit 460 when performing the preset TPTL. When the strengths are compared and the comparison results are different, the transmission signal gain of the up converter 420 is adjusted so that the base station transmission final output converges within a certain error of the total target power.

At this time, the base station modem 410 mounted on the channel card 410 transmits the overhead channel 412 and the traffic channel 414, where the first synthesizer 416 is the signal strength of the traffic channel 414 channel The sum is output to the target power calculator 452.

In addition, when the up converter 420 up-converts the baseband modem 411 output signal to the radio transmission band, the amplifier 430 amplifies the frequency-converted signal with sufficient strength for radio transmission.

In addition, the transmission end 440 transmits the base station transmission signal amplified by the amplifier 430 through a transmission antenna, and couples a portion of the signal to the transmission power detection unit 460. The transmission antenna transmits the base station transmission output signal to the mobile station, and the transmission power detection unit 460 detects the total strength of the base station final transmission output signal and outputs it to the power control unit 454.

However, the conventional apparatus and method for controlling transmission power of a base station of a mobile communication system performs an TPTL for gain adjustment of transmission power only when a base station is installed or only for a predetermined time. Cannot be grasped in real time, and therefore, there is a problem in that it takes a lot of time to take appropriate measures in case of problems with the transmission power.

The present invention has been proposed to solve the above problems, the TPTL depending on whether the absolute value of the difference between the transmission power and the target power in the base station of the mobile communication system exceeds the predetermined power threshold for a predetermined time An object of the present invention is to provide an automatic transmission power control apparatus and method for a mobile communication system base station that can be automatically performed.

According to an aspect of the present invention, there is provided a transmission power control apparatus of a mobile communication system base station, comprising: a setting value input unit for inputting various setting values for automatic TPTL execution; A transmission power detector for detecting power of a final transmission output; Periodically comparing whether the absolute value of the difference between the target power preset through the set value input unit and the detected power detected by the transmission power detection unit exceeds a preset threshold value, and the absolute value of the power difference is the threshold value Is exceeded for a predetermined time, it characterized in that it comprises a base station controller for automatically performing the TPTL for transmission power gain adjustment.

Preferably, the set value input unit may input an overhead target power, a count value for automatically starting the TPTL, and a power threshold value for state determination.

Preferably, the base station controller calculates the total target power for the final transmission output by the overhead target power input through the set value input unit; Periodically monitor whether the absolute value of the power difference exceeds the threshold value, and if the absolute value exceeds the threshold value, counting is started, and it is determined whether the count exceeds the predetermined constant time so that the count is determined. A monitoring unit for determining the start of the TPTL when a predetermined time is exceeded; The control unit may automatically include a gain control of the final transmission output according to the determination of the monitoring unit.

According to another aspect of the present invention, there is provided a method for controlling automatic transmission power of a mobile communication system base station, comprising: an input step of inputting various setting values for automatic TPTL execution; Periodically comparing whether the absolute value of the difference between the preset target power and the detected power of the final transmission signal exceeds a preset threshold value according to the input, and the absolute value of the power difference exceeds the threshold value for a predetermined time. A monitoring step of monitoring whether it is maintained; If the absolute value of the power difference exceeds the threshold value for a predetermined time, characterized in that it comprises an automatic execution step of automatically performing TPTL for transmission power gain adjustment.

Preferably, in the input step, an overhead target power, a count value for automatically starting the TPTL, and a power threshold value for determining a state may be input.

Preferably, the monitoring step determines whether the absolute value of the power difference exceeds the threshold value; Incrementing a count if the absolute value of the power difference exceeds the threshold; A comparison step may be included to compare whether the increased count exceeds the predetermined predetermined time.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the configuration of an automatic transmission power control apparatus of a mobile communication system base station according to an embodiment of the present invention.

The base station transmit power control apparatus 10 includes a channel card 110 including a base station modem 111 for generating a channel signal, an up converter 120 for up-modulating the channel signal into a radio transmission band, and the up-modulation. Amplification unit 130 for amplifying the signal to a level suitable for wireless transmission, and the transmission termination by wireless transmission of the amplified signal through a transmission antenna, and coupling a portion of the signal to the transmission power detection unit 160 140 and the absolute value of the difference between the target power set in advance through the set value input unit 170 and the detected power detected by the transmission power detection unit 160 exceeds the preset threshold for a predetermined time. The base station controller 150 which automatically performs the TPTL for power gain adjustment, the transmission power detector 160 which detects the power of the transmission signal, and the setting values for inputting various setting values for the automatic TPTL execution. It consists of a force unit (170).

The base station modem 111 of the channel card 110 sums the overhead channels 112 such as pilot, synchronization, and call, the plurality of traffic channels 114 for communication, and the outputs of the plurality of traffic channels 114. The first synthesizer 116 outputs to the base station controller 150 and the second synthesizer 418 summing the output of the first synthesizer 416 and the output of the overhead channel 412.

The up converter 120 modulates the uplink frequency of the output signal of the base station modem 110 to a corresponding radio band for wireless transmission.

The amplifier 130 amplifies the frequency-modulated signal with a constant intensity for wireless transmission.

The transmission end 140 wirelessly transmits the amplified signal through an antenna, and couples a portion of the signal to the transmission power detector 160 to detect transmission output power.

The base station controller 150 periodically compares whether the absolute value of the difference between the target power set in advance through the set value input unit 170 and the detected power detected by the transmission power detector 160 exceeds a preset threshold value, If the absolute value of the power difference exceeds the threshold for a predetermined time, TPTL for transmission power gain adjustment is automatically performed.

More specifically, the base station controller 150 calculates the overhead target power input by the operator through the set value input unit 170 and the sum of the powers for the traffic channels input from the first synthesizer 116 of the base station modem 111. On the basis of the target power calculation unit 152 for calculating the total target power for the final transmission output, and the target power calculated by the target power calculation unit 152 and the detected power detected by the transmission power detection unit 160 The monitoring unit 154 periodically determines whether the absolute value of the difference exceeds the preset power threshold for a predetermined time and determines the start of the TPTL, and the gain of the up converter 120 according to the determination of the monitoring unit 154. And a power control unit 156 for automatically performing gain adjustment of the final transmission output.

When the absolute value of the power difference exceeds the power threshold value input through the setting value input unit 170 as described below, the monitoring unit 154 starts a count to monitor whether the state is maintained for a predetermined time. When the count exceeds the predetermined time, it is determined whether the count exceeds the predetermined time, and the start of the TPTL is determined and output to the power control unit 156.

That is, when the power of the final transmission output is out of a certain error range from the total target power, the monitoring unit 154 increases the value of POWER_OUT_COUNT as described later to start counting, and is input by the setting value input unit 170. It monitors whether the count value (AUTO_TPTL_START_COUNT) has passed and determines the automatic start of the TPTL when it passes.

On the other hand, the monitoring unit 154 transitions the state to POWER_OUT_STATE when the absolute value of the power difference exceeds the power threshold value in order to detect the state of the final transmission power of the base station, and performs the power difference naturally by performing TPTL. If the absolute value of is lower than the power threshold, the state is shifted to POWER_IN_STATE, and the state transition can be notified to the operator.

The transmission power detector 160 receives the transmission output coupled by the transmission termination 140, detects the power level, and outputs the power level to the monitoring unit 154 of the base station controller 150 to perform TPTL.

The set value input unit 170 inputs a set value for automatically starting the TPTL, that is, an overhead target power, a count value for automatically starting the TPTL, and a power threshold value for determining a state.

Here, the overhead target power is for specifying the signal strength of the overhead channel as a reference for base station transmission power control, the count value is an AUTO_TPTL_START_COUNT value for specifying the start point of the TPTL as described later, and the power threshold is a count. To specify the start of.

The transmission power control apparatus 10 of the mobile communication system base station according to the embodiment of the present invention configured as described above is the monitoring unit 154 of the base station controller 150 when the TPTL execution is terminated by an operator or at a predetermined time. Is an absolute value of the difference between the total base station transmission target power calculated by the target power calculation unit 152 and the final base station output power detected by the transmission power detection unit 160, and the power input through the set value input unit 170. Periodically compare whether the threshold is exceeded.

At this time, when the absolute value of the power difference between the total target power and the detection power is larger than the power threshold value, the monitoring unit 154 transitions the state to POWER_OUT_STATE and continuously increases the POWER_OUT_COUNT to count a predetermined time.

Here, when the value of POWER_OUT_COUNT continuously increases and exceeds the AUTO_TPTL_START_COUNT indicating the start point of the TPTL, the monitoring unit 154 determines the start of the TPTL and outputs the result to the power control unit 156, and the power control unit 156. Adjusts the signal gain of the up-converter 120 to automatically perform TPTL.

When the absolute value of the power difference between the total target power and the detected power becomes smaller than the power threshold value by the automatic execution of the TPTL, the monitoring unit 154 transitions the state to POWER_IN_STATE.

On the other hand, although the absolute value of the power difference between the total target power and the detected power exceeds the power threshold value, the monitoring unit 154 transitions the state to POWER_OUT_STATE and increases the POWER_OUT_COUNT, but before the POWER_OUT_COUNT exceeds the AUTO_TPTL_START_COUNT, the total target When the absolute value of the power difference between the power and the detected power is smaller than the power threshold value, the monitoring unit 154 transitions the state to POWER_IN_STATE.

By this operation, by automatically performing the TPTL through the threshold setting, the base station transmission power can be stabilized, so that the mobile communication system can be stably operated.

Hereinafter, an automatic transmission power control method of a mobile communication system base station according to an embodiment of the present invention will be described with reference to FIGS. 2 and 3.

2 is a flowchart illustrating an automatic transmission power control method of a mobile communication system base station according to an embodiment of the present invention, Figure 3 is a state for explaining the automatic transmission power control method of a mobile communication system base station according to an embodiment of the present invention It is a transition diagram.

First, in step S201, the automatic transmission power control method of the mobile communication system base station is started by inputting various setting values for the automatic execution of the TPTL.

Here, the input setting value includes an overhead target power for calculating the total target power, a count value (AUTO_TPTL_START_COUNT) for automatically starting the TPTL, and a power threshold value for determining the state.

In step S202, the total target power is calculated based on the input overhead target power and the summed power for the traffic channel.

That is, the target power calculator 152 of the base station controller 150 may determine the overhead target power input through the set value input unit 170 and the traffic channel input from the first synthesizer 116 of the base station modem 111. The total target power of the base station final transmit power is calculated based on the summed power.

In step S203, the total target power and the detection power are periodically compared.

More specifically, the monitor 154 periodically compares the total target power calculated by the target power calculator 152 with the detected power detected by the transmission power detector 160.

In step S204, when it is determined that the absolute value for the difference between the total target power and the detected power exceeds the preset power threshold value, and the determination is made not to exceed the power threshold value, the absolute value of the power difference and the power threshold value are continuously compared. do.

If it is determined in step S204 that the absolute value for the difference between the total target power and the detected power exceeds the preset power threshold value, the flow proceeds to step S205, as shown in FIG. Transition the state to POWER_OUT_STATE.

In step S206, the monitoring unit 154 increases the POWER_OUT_COUNT to determine whether the POWER_OUT_STATE state lasts for a predetermined time.

In step S207, it is compared whether the increased count exceeds a predetermined constant time.

That is, the monitoring unit 154 determines whether the POWER_OUT_COUNT exceeds the preset AUTO_TPTL_START_COUNT, and if it is determined that the monitoring unit 154 has exceeded, proceeds to step S208 to automatically perform the TPTL for the transmission power gain adjustment.

More specifically, when the monitoring unit 154 determines the automatic start of the TPTL and outputs it to the power control unit 156 as shown in FIG. 3, the power control unit 156 adjusts the signal gain of the up converter 120. Automatically performs TPTL for final transmit power gain adjustment.

If it is determined in step S207 that POWER_OUT_COUNT does not exceed AUTO_TPTL_START_COUNT, the flow advances to step S209 to determine whether the absolute value of the power difference between the total target power and the detected power exceeds the power threshold.

That is, although the monitoring unit 154 is POWER_OUT_STATE in which the absolute value of the power difference between the total target power and the detected power exceeds the power threshold value, but the POWER_OUT_COUNT does not exceed the AUTO_TPTL_START_COUNT, the absolute value and the power threshold value of the power difference are determined. In comparison, when the absolute value of the power difference is larger than the power threshold value, the process proceeds to step S206 to increase the POWER_OUT_COUNT.

In this way, steps S206 to S209 are repeatedly performed to determine whether the absolute value of the power difference maintains the power threshold value for a predetermined time.

As a result of the determination in step S209, when it is determined that the absolute value of the power difference between the total target power and the detected power does not exceed the power threshold value, the process proceeds to step S210 and the monitoring unit 154 displays the state as shown in FIG. Transition to POWER_IN_STATE.

On the other hand, even when the TPTL for transmitting power gain adjustment is completed in step S208, the process proceeds to step S210 and the monitoring unit 154 transitions the state to the POWER_IN_STATE state.

In addition, the monitoring unit 154 may notify the operator of such a state transition.

In step S210, the monitoring unit 154 transitions the state to the POWER_IN_STATE state by performing the TPTL of step S209 or naturally when the absolute value of the power difference between the total target power and the detected power becomes smaller than the power threshold value. Returning to S204, the absolute value of the power difference and the power threshold value are continuously compared.

In this manner, the automatic transmission power control method of the mobile communication system base station is terminated.

As described above, in the apparatus and method for controlling transmission power of an EVDO system base station according to the present invention, an absolute value for the difference between the power of a transmission output and a target power is preset at a base station of a mobile communication system for a predetermined time. If the absolute value of the power difference exceeds the power threshold for a predetermined time, the TPTL is automatically performed to adjust the transmission power gain, and thus the intensity of the final transmission power of the base station can be adjusted within the power threshold. When there is a problem with the transmission power, it is possible to take immediate action. By notifying the operator whether the automatic TPTL is performed, it is easy to grasp the abnormality of the transmission power of the base station. It has an effect.

Claims (6)

In the transmission power control apparatus of a mobile communication system base station, A setting value input unit for inputting various setting values for automatically performing a TPTL (Transmit Power Tracking Loop); A transmission power detector for detecting power of a final transmission output; Periodically comparing whether the absolute value of the difference between the target power preset through the set value input unit and the detected power detected by the transmission power detection unit exceeds a preset threshold value, and the absolute value of the power difference is the threshold value Is exceeded for a predetermined time, automatic transmission power control apparatus of a mobile communication system base station comprising a base station control unit for automatically performing TPTL for transmission power gain adjustment. The method of claim 1, And the set value input unit receives an overhead target power, a count value for automatically starting the TPTL, and a power threshold value for determining a state. The method of claim 2, The base station control unit, A target power calculator for calculating the total target power for the final transmission output by the overhead target power inputted through the set value input unit; Periodically monitor whether the absolute value of the power difference exceeds the threshold value, and if the absolute value exceeds the threshold value, counting is started, and it is determined whether the count exceeds the predetermined constant time so that the count is determined. A monitoring unit for determining the start of the TPTL when a predetermined time is exceeded; And a power control unit for automatically performing a gain adjustment of a final transmission output in accordance with the determination of the monitoring unit. In the transmission power control method of a mobile communication system base station, An input step of inputting various setting values for automatic TPTL execution; Periodically comparing whether the absolute value of the difference between the preset target power and the detected power of the final transmission signal exceeds a preset threshold value according to the input, and the absolute value of the power difference exceeds the threshold value for a predetermined time. A monitoring step of monitoring whether it is maintained; And an automatic execution step of automatically performing a TPTL for transmission power gain adjustment if the absolute value of the power difference exceeds the threshold for a predetermined time. . The method of claim 4, wherein And the input step includes inputting an overhead target power, a count value for automatically starting the TPTL, and a power threshold value for determining a state. The method of claim 4, wherein The monitoring step, A determination step of determining whether an absolute value of the power difference exceeds the threshold value; Incrementing a count if the absolute value of the power difference exceeds the threshold; And a comparison step of comparing whether the increased count exceeds the predetermined predetermined time.

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