KR100640480B1 - Apparatus and method for controlling transmitting power in mobile communication terminal - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

The present invention relates to an apparatus and method for controlling transmission power in a mobile communication terminal.

I. The technical problem to be solved by the invention

Provided are an apparatus and method for controlling transmission power for application in a poor channel environment in an underground or high speed train.

All. Summary of Solution of the Invention

An apparatus according to the present invention is a device for controlling transmission power in a mobile communication terminal, comprising: a reception field strength measurement unit for measuring a reception field strength of a received signal, and a power control determination for extracting power control bits from the received signal And a finger number determination unit for determining the number of fingers for increasing the transmission power corresponding to the value of the received field strength measured by the reception field strength measurement unit, an output of the finger number determination unit, and an output of the power control determination unit. And a transmission power level determining unit for determining a rising and falling of the transmission power and a transmission power determining unit for determining a transmission amplification degree by the output of the transmission power level determining unit to control the transmission amplifier.

la. Important uses of the invention

It is used for transmission power control of a mobile communication terminal.

Transmit Power Control, Mobile Terminal, Receive Field Strength

Description

Apparatus and method for controlling transmission power in mobile communication terminal {APPARATUS AND METHOD FOR CONTROLLING TRANSMITTING POWER IN MOBILE COMMUNICATION TERMINAL}             

1 is a block diagram for determining a transmission power in a mobile communication terminal according to the present invention;

2 is a block diagram of a configuration for controlling transmission power and a transmission unit according to an embodiment of the present invention.

The present invention relates to an apparatus and method for measuring power, and more particularly, to an apparatus and method for measuring power received at a mobile communication terminal.

Typically, the size of the transmit power in the terminal is made by measuring the received power. That is, the transmission power is determined based on a down or up command of the power received by the base station of the mobile communication system. The received power becomes basic information for determining the size of the transmit power, and the actual determination of the transmit power of the terminal is determined through the information of the rising or falling of the power coming from the base station.

As described above, a process of determining the magnitude of power in the mobile communication terminal based on information of rising or falling power received from the base station is called reverse link power control (RLPC). This reverse power control is an important process for determining the amount of transmit power. This is because the correct transmission power cannot be determined in the case where the reverse power control is not normally performed.

Therefore, it should be provided with a portion for measuring the magnitude of the power received from the mobile communication terminal, and determines the magnitude of the transmission power through the reverse power control. In such a mobile communication terminal, a block for determining transmission power through reverse power control becomes an automatic gain control unit (AGC). This will be described in more detail as follows.

When a predetermined signal is received through the antenna of the mobile communication terminal, the transmitted signal and the received signal are separated from the duplexer and output. Therefore, when the signal received from the duplexer is separated, the amplification is performed through the low noise amplifier (LNA), and then the power of the signal received from the receiving automatic gain control amplifier is adjusted. The automatic gain control amplifier has a constant amplification gain in the general case. However, when the mobile communication terminal approaches the base station, the received power becomes very large. Therefore, an operation must be performed to prevent the received data from being disconnected. If the received power is too large, the signal may be distorted, which may cause the signal to be disconnected without being restored normally. Therefore, in this case, the low noise amplifier sets the gain of the amplification to zero and allows the received signal to be amplified only by the automatic gain amplifier. The automatic gain control amplifier is a device for adjusting and amplifying a gain value set by a user regardless of the amount of power received by the user.

In the same manner as described above, the adjustment of the transmission power is also made by the transmission automatic gain amplifier, and the main transmission power is adjustment by the automatic gain amplifier. Therefore, the value of the transmission power is made by the value of the power control command received from the base station and the value set by the user. That is, the transmission power is determined by the sum of the power control value according to the power control command of the rising or falling transmitted from the base station to the terminal and the value of the amplification degree according to the reception power set by the user.

The command of increasing or decreasing the power received from the base station is interpreted at the fingers of the mobile communication terminal, and each finger receives a power rising or falling command suitable for the environment of the channel. These fingers are generally composed of four for CDMA 1x and six for CDMA 3x. Since the paths of the data received from the base station to the mobile communication terminal are different from each other, the fingers are interpreted and output a command of rising or falling of power corresponding to each path. The mobile communication terminal allocates one received data to each finger. Each filter then interprets the assigned power control command and outputs one bit of information about the power control up or down command. Through this process, the power bits interpreted by each finger are provided to the automatic gain control amplifier. Thus, the auto gain control amplifier adds the power bits received from each finger to the current received power to determine the transmit power value.

In this case, the automatic gain control amplifier is configured to increase the value of the transmit power if all the power bits received from each finger are rising, and to fall down otherwise.

The above-described method of determining the value of the transmission power can be used smoothly in the general case, but there is a problem that the efficiency is reduced when the environment of the channel is poor. That is, even when the environment of the channel is poor, the reception sensitivity of the power may be different depending on the path of receiving the signal from the base station to the terminal. In this case, the power control bit for power control for each finger transmitted from the base station to the terminal may have a difference in the command of rising or falling. Therefore, in this case, the base station continuously transmits a power up or down command according to the channel environment, and the terminal receives and interprets each of the fingers along the path of each channel. Then, when the environment of the channel is poor, the power control commands for rising or falling are different for each finger.

As described above, if the command of the power control bit continuously received by the terminal is different when the environment of the channel is poor, there is a problem that normal communication becomes difficult, and in this case, a call disconnection may occur in severe cases.

Accordingly, an object of the present invention is to provide an apparatus and method for adaptively controlling a transmission power through another method in a terminal environment.

Another object of the present invention is to provide a transmission power control method adaptive to a channel environment in a mobile communication terminal using the received field strength.

A method according to the present invention for achieving the above objects is a method for controlling the transmission power in a mobile communication terminal, the process of measuring the received field strength by detecting the power of the received signal, and the measured received field strength Reading a number of fingers for increasing a corresponding transmission power, extracting a power control bit from each received finger from the received signal, and a value of a power control bit having a rising value of the power control bit; And controlling the transmission power according to the number of fingers for power increase according to the received electric field strength.

In addition, the values of the fingers according to the received electric field strength are configured to be stored in a table in advance through the measurement.

An apparatus according to the present invention for achieving the above objects is a device for controlling the transmission power in a mobile communication terminal, the receiving field strength measuring unit for measuring the received field strength of the received signal, and the power control from the received signal A power control determiner for extracting bits, a finger number determiner for determining the number of fingers for increasing the transmit power corresponding to the value of the received field strength measured by the received field strength measuring unit, and an output of the finger number determiner And a transmission power level determining unit which determines the rising and falling of the transmission power by the output of the power control determining unit, and a transmission power determining unit which determines the transmission amplification degree by the output of the transmission power level determining unit to control the transmission amplifier. It is done.

In addition, the finger count determination unit;                         

And a memory for storing the number of fingers for increasing transmission power according to the value of the received electric field strength, and a finger number discriminating unit for reading and outputting corresponding data from the memory according to the value of the received electric field strength. .

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

1 is a block diagram for determining a transmission power in a mobile communication terminal according to the present invention. Hereinafter, the configuration and operation of each block for determining transmission power in a mobile communication terminal will be described in detail with reference to FIG. 1. In the present embodiment, the configuration according to the version of CDMA 1x will be described.

The automatic gain control unit 10 amplifies the received signal with a predetermined gain value and outputs it to the respective fingers. Then, the first finger 12 to the fourth finger 15 detect the power control bit from the received signal and output the detected power control bit to the power control determiner 11. In addition, the first finger 12 to the fourth finger 15 decodes the received data and outputs it to the combiner 16 to process the data. The power control determination unit 11 has data that is tabled in advance. In addition, the number of bits according to the increase or the decrease of the transmission power output from each of the fingers is detected, and the value of the received field strength (RSSI) is compared with the values according to the table data. That is, different power control is performed according to the number of rising or falling bits of the transmit power of the power control bits output from each finger according to the value of the received electric field strength. This will be described in more detail with reference to FIG. 2.

2 is a block diagram illustrating a configuration for controlling transmission power and a transmission unit according to an embodiment of the present invention. Hereinafter, a process of determining the transmission power according to the present invention will be described in more detail with reference to FIG. 2.

The receiving power measuring unit 21 measures the value of the power received from the antenna ANT and outputs it to the receiving electric field strength measuring unit 24 and the power control determination unit 22. Then, the received field strength measuring unit 24 measures the received field strength using the received power value, digitizes it, and outputs it as data. In addition, the power control determination unit 22 measures a power control value using each finger. That is, the value of the power control bit is output by the fingers.

On the other hand, the finger number determination unit reads the value of the number of fingers for increasing the transmission power according to the received electric field strength value using the data stored in the memory 26 and outputs it to the power level setting unit 23. Accordingly, the power level setting unit 23 receives the value of the transmission power control bit indicating the rising or falling from the finger and the number of fingers for increasing the power according to the received electric field strength to increase the transmission power. Or decide whether to drop the transmit power.

For example, in the conventional case, the transmission power is increased only when the outputs of all the fingers indicate an increase, but in the present invention, when the value of the received electric field strength is less than or equal to the first set value, 3 of the outputs of the fingers are shown. If more than two outputs can be configured to power up. In contrast, when the value of the received electric field strength is less than or equal to the second set value, the power may be increased when two or more of the outputs of the finger are increased, and only one finger output may be configured to increase even when the singling is performed. As the number of power control bit rising values for power control output from the finger decreases as described above, the state of the channel becomes worse.

In this way, the value of the power control rising or falling output from the power level setting unit 23 is output to the transmission power determining unit 27. The transmission power determining unit 27 adds the value output from the power level setting unit 23 to the current power to determine the transmission power, and outputs it to the transmission amplifying unit 28 to control the transmission power. Through this process, the transmission power can control the transmission power adaptively to the environmental change of the channel.

As described above, there is an advantage that the control of power can be more adaptive by using the value of the received electric field strength. This has the advantage that the power control can be more smoothly applied when applied in a very high speed train or underground and mountainous terrain where the wireless environment is poor than usual.

Claims (4)

In the method for controlling the transmission power in the mobile communication terminal, Measuring the received electric field strength by detecting the power of the received signal; Reading a number of fingers for increasing transmission power corresponding to the measured received electric field strength; Extracting a power control bit using the fingers from the received signal; Transmission power in the mobile communication terminal characterized in that the control of the transmission power according to the value of the power control bit having the rising value of the power control bit and the number of fingers for the power increase according to the received electric field strength. Control method. The method of claim 1, The transmission power control method of the mobile communication terminal, wherein the values of the fingers according to the received electric field strength are stored in a table in advance through measurement. An apparatus for controlling transmission power in a mobile communication terminal, A received field strength measuring unit for measuring a received field strength of the received signal; A power control determination unit for extracting power control bits from the received signal; A finger number determination unit determining a number of fingers for increasing transmission power corresponding to the value of the reception field strength measured by the reception field strength measurement unit; A transmission power level determination unit which determines the rising and falling of transmission power by an output of the finger number determination unit and an output of the power control determination unit; And a transmit power determiner configured to control a transmit amplifier by determining a transmit amplification degree by an output of the transmit power level determiner. The method of claim 3, wherein the finger number determining unit, A memory that stores the number of fingers for increasing transmission power according to the value of the received electric field strength; And a finger number discriminating unit configured to read and output corresponding data from the memory according to the received received electric field strength value.

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