KR20090101016A - Power control method and device - Google Patents

Abstract

PURPOSE: A power control method and an apparatus thereof for minimizing call interference in a cell edge region are provided to control the call quality by each barer and minimize call interference in the cell edge region. CONSTITUTION: A power control apparatus controlling external loop power includes a communication unit(310) and an analyzing unit(315). The communication unit receives the channel frame from a base station. The analyzing unit acquires SIR(Signal to Interference Ratio) in a channel frame. The analyzing unit resets target block error ratio by using SIR. The power control apparatus carries out the outer loop power control with the base station it uses the reset target block error ratio.

Description

Power control method and device

The present invention relates to a mobile communication system, and more particularly, to a method and an apparatus for extending traffic coverage by improving outer loop power control.

1 is an exemplary view for explaining a conventional power control method.

In general, power control includes forward link power control and reverse link power control. Here, forward strategy control means adjusting the amount of power transmitted from the base station to the terminal, and reverse power control means that the base station adjusts the amount of transmission power of the terminal based on the signal received from the base station. .

In the base station forward power control, the base station changes the forward transmission power by using a reception state signal transmitted by a terminal using a signal received in the forward direction (TPC bit: Transmit Power Control).

In addition, the reverse power control performed by the terminal measures the energy of bit / noise of other signals (Eb / No) of the signal received from the terminal at the base station, compares it with a preset Eb / No threshold value, and transmits a control signal to the terminal. At 100, reverse transmission power is changed.

In addition, power control includes open loop power control and closed loop power control, as illustrated in FIG. 1.

Open loop power control is used to set the signal power that the terminal will transmit in the reverse direction upon first attempt. That is, when the terminal transmits a phsycal random access channel (PRACH) preamble or when the RRC connection setup complete (RRC connection setup complete), the power value of the dedicated physical control channel (DPCCH) hereinafter referred to as "DPCCH". Used to set

Open loop power control is performed under the assumption that the characteristics of the forward and reverse links will be similar. Therefore, in the open loop power control, the terminal receives a signal of a preset transmission power from the base station and sets a corresponding transmission power. In such a case, it is called open loop power control because the flow of power control is not circulated.

After the closed loop power control is in a traffic state (for example, after initial power is set through the open loop power control and the synchronization process is performed), when the terminal transmits a signal to the base station, the base station sets the received signal to a preset threshold. After comparing with the value, the base station repeatedly commands the base station to adjust the transmission power level according to the comparison result, so that the power control flow is circulated between the terminal, the base station, and the base station controller. Closed loop power control includes inner loop power control and outer loop power control.

When the terminal 100 transmits a signal to the base station 200 after the closed loop power control is in a traffic state, the base station 200 compares the received signal with a preset threshold. Then, the base station repeats the command to adjust the transmission power level accordingly so that the flow of power control is circulated between the terminal 100, the base station 200, and the base station controller 300. Closed loop power control includes inner loop power control and outer loop power control.

Inner loop power control measures the signal-to-interference ratio (SIR) of the signal received from the terminal 100 at the base station 200 and compares it with the threshold (ie, SIR threshold) to determine the power control signal.

The base station 200 evaluates the signal-to-interference ratio (SIR) of the signal received from the terminal 100, and compares the estimated signal-to-interference ratio (SIR) value with a threshold value (signal-to-interference ratio (SIR) threshold). The power control command signal is transmitted to 100. If the received signal-to-interference ratio (SIR) is greater than the preset power control threshold signal-to-interference ratio (SIR) threshold by the power control command signal, the terminal 100 lowers the transmission power, and vice versa. Increase the transmit power.

Outer loop power control is to adjust a threshold (signal-to-interference ratio (SIR) threshold) for power control in the base station 200 and the base station controller 300.

The base station controller 300 receives a traffic channel frame received from the terminal 100 at the base station 200. The base station controller 300 checks the received traffic channel block error rate (BLER) and adjusts a power control threshold (signal-to-interference ratio (SIR) threshold) accordingly to transmit power of the terminal 100. Adjust.

However, conventional outer loop power control has a problem in that call drop occurs due to power limitation when a call moves to a cell edge region. That is, since a limited traffic block error rate (BLER) must be satisfied using limited power, disconnection due to power shortage may occur.

The present invention is to provide a power control method and apparatus for minimizing call disconnection even in the cell edge region.

In addition, the present invention is to provide a power control method and apparatus for controlling the call quality for each bearer (barer).

According to an aspect of the present invention, a method of controlling an outer loop power by a power control apparatus is provided.

According to an embodiment of the present invention, a method for controlling an outer loop power by a power control apparatus, the method comprising: receiving a channel frame from a base station to obtain a signal to interference ratio (SIR) value; And resetting a target block error rate by using n (natural numbers of two or more) signal-to-interference ratio (SIR) values continuously acquired for a predetermined time, wherein the base station uses the reset target block error rate. A power control method may be provided which performs outer loop power control with an oversupply loop.

According to another embodiment of the present invention, a method for controlling an outer loop power by a power control device, the method comprising: receiving a dedicated measurement report message from a base station to obtain a transmission power value; Determining whether the transmission power value is a maximum power value; And resetting by increasing the target block error rate if the maximum value is determined, and performing an outer loop power control with the base station using the reset target block error rate. Can be.

According to another aspect of the present invention, a power control apparatus for controlling outer loop power is provided.

A power control device for controlling outer loop power, comprising: a communication unit receiving a channel frame from a base station; And acquiring a signal-to-interference ratio (SIR) value in the channel frame, and resetting a target block error rate (target BLER) using n (natural number of two or more) signal-to-interference ratio (SIR) values continuously obtained for a predetermined time. Including an analysis unit, a power control apparatus for performing an outer loop power control with the base station using the reset target block error rate may be provided.

According to another embodiment of the present invention, a power control apparatus for controlling an outer loop power, comprising: a communication unit for receiving a dedicated measurement report message from a base station; And an analyzer configured to obtain a transmission power value from the measurement report message and to analyze the transmission power value to reset a target block error rate, and to perform outer loop power control with the base station using the reset target block error rate. A power control device can be provided.

By providing the power control method and apparatus according to the present invention, there is an effect of minimizing call disconnection even in the cell edge region.

In addition, the present invention has the effect of adjusting the call quality for each bearer (barer).

In addition, the present invention has the effect of providing a better service to the user's trust and the user by preventing the call disconnection caused by the limitation of power control.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

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

2 is a block diagram schematically illustrating a mobile communication system according to an embodiment of the present invention.

As illustrated in FIG. 2, the mobile communication system 200 according to the present invention includes a terminal 210, at least one Node B 215, at least one RNC 220, a switch (MSC), and a packet switched support node (SGSN). serving GPRS support node- hereinafter referred to as 'SGSN', a packet gateway support node (GGSN) (hereinafter referred to as 'GGSN'), and a home location register (HLR).

The user terminal 210 is a wireless terminal used for wireless communication. The user terminal 210 may be equally applicable to any device that can be provided with various additional services in combination with an apparatus (or server) that provides an arbitrary service through a communication network. For example, the user terminal 210 may be a mobile communication terminal, a PDA, a notebook, or the like.

Node B 215 performs air interface L1 processing procedures (eg, channel coding, interleaving, rate adaptation, spreading, etc.). Node B 215 also performs some basic radio resource management as inner loop power control. In the following description, the node B 215 and the base station will be collectively described.

The RNC 220 is a network element responsive for radio resource control of the UTRAN and performs a function of controlling power with the terminal 210. Hereinafter, in the present specification, the power control device 300 will be described based on the assumption that the power control device 300 is the RNC 220, but it may be other devices included in a network such as a base station controller other than the RNC 220.

The exchange 225 performs a function of providing a circuit switching service to a mobile communication subscriber in conjunction with a fixed network. The exchange 225 performs a function of configuring an access point for user traffic between the mobile communication network and the general telephone network, and other exchanges in the same or different mobile communication networks. In addition, the exchange 225 can detect the location of the subscriber to always provide a mobile communication service.

SGSN 230 is responsible for data packet transmission with the user terminal 210 in the service area. For example, SGSN 230 performs functions such as packet routing and transmission, management of user terminal 210, logical link management, authentication, and charging. In addition, the location register in SGSN 230 stores location information (cell, visitor location register, etc.), user profile (international mobile station identification number: IMSI), and the like of GPRS users registered in SGSN.

The GGNS 235 is in charge of the connection function between the GRPS backbone network and the external packet data network. Converts the packet received from the GGNS 235 into an appropriate packet data protocol (PDP) format (e.g., IP, X.25) and transmits it, and converts the PDP address of the incoming packet data into an address on the receiver's mobile communication system. It performs the function.

The home location register 240 is a database having subscriber information, subscription information, location information, and authentication functions. The home location register 240 controls the signaling network protocol (SS7), together with the exchange 225 and the visitor location register (VLR), and transacts with the VLR to complete the incoming call and update subscriber information. Do this.

FIG. 3 is a diagram illustrating an internal functional block of a power control apparatus according to an embodiment of the present invention, and FIG. 4 is a diagram illustrating parameters set for power control according to an embodiment of the present invention. The power control apparatus 300 described below may be a base station controller or RNC on the mobile communication system 200. The power control apparatus 300 described below may be equally applicable to any apparatus capable of controlling outer loop power with a base station or a node B. Devices for which outer loop power control is performed by the power control device 300 according to the communication network may be named differently. That is, a base station or a node B is a device named differently according to each communication network. Hereinafter, for convenience of understanding and description, a device in which the power control device 300 performs outer loop power control will be collectively described as a base station.

Hereinafter, the power control device 300 will control the outer loop power with the base station in detail.

As illustrated in FIG. 3, the power control apparatus 300 according to the present invention includes a communication unit 310, an analysis unit 315, a storage unit 320, and a control unit 325.

The communication unit 310 performs a function of transmitting and receiving data with the base station through a communication network. For example, the communication unit 310 may receive the channel frame at a predetermined time interval from the base station and output the channel frame to the analysis unit 315. In addition, the communication unit 310 may transmit a signal-to-interference ratio (SIR) value according to the reset target block error rate under the control of the control unit 325 to the base station. In addition, the communication unit 310 may transmit the reset target block error rate under the control of the control unit 325 to the terminal 210 through the base station using a reconfiguration message.

The analyzer 315 acquires and analyzes a signal-to-interference ratio (SIR) value in the channel frame input through the communication unit 310, and resets the target block error rate according to the analysis result.

That is, the analysis unit 315 compares the consecutive n (natural numbers of two or more) signal-to-interference ratios (SIR) values obtained for a predetermined time period with the maximum value, respectively, if the n-signal-to-interference ratio (SIR) values are the maximum values. Reset by decreasing the target block error rate (target BLER).

Also, if the signal-to-interference ratio (SIR) does not exceed the maximum value, the analyzer 315 calculates a difference between the signal-to-interference ratio (SIR) value and the maximum value. The analyzer 315 compares whether the calculated difference value is equal to or less than the threshold value, and if the threshold value is equal to or less than the threshold value, increases and resets the target block error rate (target BLER).

The storage unit 320 stores software, an algorithm, and the like for operating the power control device 300 according to the present invention. In addition, the storage 320 stores various information necessary for power control (for example, information such as currently set target block error rate, set maximum value, and threshold value). Information (or parameters-for ease of understanding and explanation) that the storage 320 is storing for power control is illustrated in FIG. 4.

As shown in FIG. 4, information (or parameters) set for power control includes a target block error rate parameter in which a current target block error rate is set, and a signal-to-interference ratio (SIR) parameter in which a signal-to-interference ratio (SIR) value is set. Information about the minimum signal-to-interference ratio parameter storing the minimum signal-to-interference ratio value, the maximum signal-to-interference ratio parameter storing the maximum value of the signal-to-interference ratio (SIR), and the channel frame having the maximum signal-to-interference ratio (SIR) value And the like. Naturally, other information (or parameters) may be stored as needed.

The controller 325 performs a function of controlling an internal function configuration (eg, the communication unit 310, the analysis unit 315, the storage unit 320, and the like) of the power control device 300 according to the present invention.

In addition, the controller 325 performs the outer loop power control with the base station using the reset target block error rate.

For another example, the power control apparatus 300 may control the outer loop power with the base station by obtaining the transmit power of the base station. In this case, the communication unit 310 may receive a dedicated measurement report message from the base station at predetermined time intervals and output the received measurement report message to the analysis unit 315. Accordingly, the analyzer 315 obtains the transmission power of the base station from the input measurement report message and determines whether or not it is greater than or equal to a preset maximum power value. (step down) You can reset it. In addition, the analyzer 315 may determine whether the transmit power is less than the threshold power value, and if it is determined to be less than the threshold power value, may increase and reset the target block error rate. Here, the report on the transmission power received from the base station 215 may be reported periodically at predetermined time intervals, or may be reported whenever a specific event occurs.

In the present specification, the step up of the target block error rate is numerically reduced but is improved in terms of quality of service, and the step of step down of the target block error rate is numerically increased but is not limited to service. It means worse in quality.

For example, suppose that the transmission power corresponding to the maximum value was received while the initial target block error rate was 0.1%. In such a case, the power control device 300 increases the target block error rate from 0.1% to, for example, 1%. This results in poor quality of service. That is, the expression of the increase or decrease of the target block error rate in the present specification should be understood as an expression considering the quality of service, not an expression of numerical increase or decrease.

In addition, the power control device 300 not only performs the outer loop power control with the base station using the target block error rate but also resets the changed target block error rate when the target block error rate is changed in parallel (for example, radio). bearer reconfiguration message- (hereinafter, referred to as a "reconfiguration message") may be transmitted to the terminal 210 through the base station. Accordingly, the terminal 210 acquires the changed target block error rate in the corresponding reset message and internally performs power control accordingly. This has the advantage of minimizing arc truncation at the cell edge.

5 is a flowchart illustrating a method of controlling an outer loop power with a terminal by a power control apparatus according to an embodiment of the present invention. Hereinafter, it is assumed that a communication call is established by requesting a call from a terminal, and the power control method will be described later. In addition, each step described below is performed by each internal component of the power control device 300, but will be collectively described as a power control device for the convenience of understanding and explanation. In addition, since the target block error rate and the maximum value and the minimum value of the SIR are different for each bearer, it is natural that the power control method described herein should be applied to each bearer. .

In operation 510, the power control device 300 receives a channel frame from a base station through a communication network. Here, the power control device 300 receives channel frames from the base station at predetermined time intervals, respectively.

In operation 515, the power control device 300 obtains a good or bad (error value) of the block through the received channel frame, and calculates a signal-to-interference ratio (SIR) value by using the same.

In operation 520, the power control apparatus 300 determines whether the signal-to-interference ratio (SIR) value is the maximum value.

If it is determined to be less than the maximum value, the power control device 300 calculates a difference value between the signal-to-interference ratio (SIR) value and the maximum value in step 525.

In operation 530, the power control apparatus 300 determines whether the calculated difference value is greater than or equal to a preset first threshold value.

If it is determined that the threshold value is greater than or equal to the threshold value, in step 535, the power control apparatus 300 resets the target block error rate by increasing the target block error by one step. Here, when the target block error rate is set to the maximum value, power control may be performed in the same manner without changing the target block error rate.

In operation 540, the power control apparatus 300 performs outer loop power control with the base station using the reset target block error rate. In addition, when the signal-to-interference ratio (SIR) value corresponding to the reset target block error rate is changed, the power control device 300 may transmit the corresponding signal-to-interference ratio (SIR) value to the base station.

In addition, the power control device 300 transmits the reset target block error rate to the terminal 210 through the base station using a reconfiguration message. For this reason, the terminal 210 may acquire the target block error rate reset in the corresponding reset message and perform power control internally.

As such, the power control apparatus 300 may perform power control in the forward and reverse directions using the reset target block error rate.

However, if it is determined as the maximum value, in step 545 the power control device 300 determines whether all of the consecutive n (natural number of two or more) signal-to-interference ratio (SIR) value is the maximum value.

For example, the power control device 300 counts a counter when the signal-to-interference ratio (SIR) values of consecutively received channel frames are each the maximum value. Here, the counter is set to an initial value (eg, '0') at the time of call setup, and may be reset to an initial value if the signal-to-interference ratio (SIR) value is less than the maximum value even once.

If all are determined to be the maximum value, in step 550 the power control device 300 resets by decreasing the target block error rate (target BLER). The power control device then proceeds to step 540.

For example, assume that the current target block error rate (target BLER) is set to a default value (normal). In addition, it is assumed that the target block error rate is divided into a first target block error rate, a second target block error rate, and a third target block error rate for convenience of understanding and explanation. In this state, if the consecutive n signal-to-interference ratios (SIR) values are all greater than or equal to the maximum value, the power control apparatus 300 may reset the currently set target block error rate to the first target block error rate. When the n consecutive signal-to-interference ratios (SIR) values are all equal to or larger than the maximum value in the state where the first target block error rate is set, the second target block error rate may be reset.

However, if either is not the maximum value, in step 555 the power control device 300 maintains the current target block error rate (target BLER) state.

As such, when the signal-to-interference ratio (SIR) values corresponding to the n channel frames continuously received from the base station 215 are all greater than or equal to the maximum value, the power control apparatus 300 decreases and resets the target block error rate. When the signal-to-interference ratio (SIR) value is less than the maximum value, the power control device 300 calculates a difference value between the signal-to-interference ratio (SIR) value and the maximum value and targets when the calculated difference value is greater than or equal to the threshold value. The block error rate (target BLER) can be reduced and reset. In addition, the power control apparatus 300 performs the outer loop power control with the base station using the reset target block error rate. In addition, the power control device 300 transmits a signal-to-interference ratio (SIR) value corresponding to the reset target block error rate to the base station. In addition, as described above, the power control apparatus 300 may transmit the reset target block error rate to the terminal 210 through the base station using the reset message to perform outer loop power control in both forward and reverse directions.

For example, the power control device 300 may transmit the reset target block error rate to the terminal 210 through the base station using a reconfiguration message. Accordingly, the terminal 210 may internally perform power control after acquiring the reset target block error rate in the corresponding reset message.

6 is a flowchart illustrating a method of controlling an outer loop power by a power control apparatus according to another embodiment of the present invention. Each step described below is performed by the internal functional configuration of the power control device 300, but will be collectively described as a power control device for the convenience of understanding and explanation.

In operation 610, the power control apparatus 300 obtains transmitted code power from the base station.

For example, the power control device 300 may receive a dedicated measurement report message at a predetermined time interval from the base station. For example, the occupancy measurement report message includes information as illustrated in FIG. 7. As illustrated in FIG. 7, the occupancy measurement report message also includes information on the transmission power of the base station. Accordingly, the power control device 300 may obtain the transmission power at the present time of the corresponding base station from the occupancy measurement report message.

In operation 615, the power control apparatus 300 determines whether the obtained transmission power is a maximum power value.

If the maximum power value is determined, in step 620, the power control apparatus 300 resets by decreasing the currently set target block error rate target BLER.

In operation 625, the power control apparatus 300 performs outer loop power control with the base station using the reset target block error rate.

In addition, the power control device 300 transmits the reset target block error rate to the terminal 210 through the base station using the reset message. Accordingly, the terminal 210 may acquire the reset target block error rate in the corresponding reset message and then internally perform power control accordingly. Accordingly, the power control apparatus 300 may perform power control by using the changed target block error rate for the forward and reverse directions.

However, if the transmission power is determined to be less than the maximum power value, in step 630 the power control device 300 determines whether the transmission power is less than the threshold power value.

If it is determined to be less than the threshold power value, in step 635 the power control device 300 steps up and resets the currently set target block error rate (target BLER).

However, if determined above the threshold power value, the power control device 300 maintains the current network state at step 640.

As described above, the power control device 300 may analyze the transmission power of the base station to control the target block error rate according to the corresponding transmission power, and correspondingly control the transmission power of the base station. In addition, the power control device 300 may transmit the changed target block error rate to the terminal 210 through the base station using the reset message. Accordingly, the terminal 210 has an advantage of minimizing call truncation at the cell edge by acquiring the target block error rate changed in the reset message and performing power control in the terminal 210.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below It will be appreciated that modifications and variations can be made.

1 is an exemplary view for explaining a conventional power control method.

2 is a block diagram schematically illustrating a mobile communication system according to an embodiment of the present invention;

3 is a diagram illustrating an internal functional block of a power control apparatus according to an embodiment of the present invention.

4 illustrates parameters set for power control in accordance with an embodiment of the present invention.

5 is a flowchart illustrating a method of controlling an outer loop power with a terminal by a power control apparatus according to an embodiment of the present invention.

6 is a flowchart illustrating a method of controlling an outer loop power by a power control apparatus according to another embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

310: communication unit

315: analysis

320: storage unit

325: control unit

Claims (17)

In the method for the power control device to control the outer loop power (outer loop power), Receiving a channel frame from a base station to obtain a signal-to-interference ratio (SIR) value; And Resetting the target block error rate (target BLER) using the n (natural number of two or more) signal-to-interference ratio (SIR) values continuously obtained for a predetermined time, And controlling outer loop power with a base station using the reset target block error rate. According to claim 1, Resetting the target block error rate (target BLER) using the n (natural number of two or more) signal-to-interference ratio (SIR) values continuously obtained for a predetermined time period, Determining whether the n signal-to-interference ratio (SIR) values are the maximum values, respectively; And And determining, by each of the maximum values, stepping down and resetting the target block error rate. The method of claim 2, Calculating a difference value between the signal-to-interference ratio (SIR) and the maximum value, when each value is not the maximum value; Determining whether the difference is less than or equal to a threshold; And If less than the threshold value, further comprising the step of increasing the target block error rate and resetting. According to claim 1, The reset target block error rate is transmitted through the base station to the terminal using a reconfiguration message, The terminal acquires the reset target block error rate from the reset message and performs power control internally. According to claim 1, And transmitting a signal-to-interference ratio (SIR) value according to the reset target block error rate to the base station. A power control device for controlling outer loop power, A communication unit receiving a channel frame from a base station; And Analysis of acquiring a signal-to-interference ratio (SIR) value in the channel frame and resetting a target block error rate (target BLER) by using n (natural numbers of two or more) signal-to-interference ratio (SIR) values continuously acquired for a predetermined time. Including wealth, And an outer loop power control with the base station using the reset target block error rate. The method of claim 6, The analysis unit, And determining whether the n signal-to-interference ratios (SIR) values are the maximum values, and if the maximum values are set, reduce the target block error rate and reset the target block error rates. The method of claim 7, wherein The analysis unit, When the difference is not the maximum value, the difference between the signal-to-interference ratio (SIR) value and the maximum value is calculated, respectively, and if the difference value is less than or equal to the threshold value, the target block error rate is increased and reset. Power control device, characterized in that. The method of claim 6, The reset target block error rate is transmitted to the terminal through the base station using a reconfiguration message, And the terminal acquires the reset target block error rate from the reset message and performs power control internally. The method of claim 6, The analyzing unit transmits a signal-to-interference ratio (SIR) value according to the reset target block error rate to the base station. In the method for the power control device to control the outer loop power (outer loop power), Receiving a dedicated measurement report message from a base station to obtain a transmission power value; Determining whether the transmission power value is a maximum power value; And If the maximum value is determined, increasing and resetting the target block error rate; And performing outer loop power control with the base station using the reset target block error rate. The method of claim 11, wherein If the maximum power value is less, determining whether the transmission power value is less than a threshold power value; And If it is less than the threshold power value, reducing and resetting the target block error rate. The method of claim 11, wherein The reset target block error rate is transmitted to the terminal through the base station using a reconfiguration message. The terminal acquires the reset target block error rate in the reset message, and performs power control internally according to the obtained target block error rate. In the power control device for controlling the outer loop power (outer loop power), A communication unit receiving a dedicated measurement report message from a base station; And An analysis unit for obtaining a transmission power value from the measurement report message and analyzing the transmission power value to reset a target block error rate; And an outer loop power control with the base station using the reset target block error rate. The method of claim 13, And the analyzing unit determines whether the transmission power value is a maximum power value, and if the maximum power value is determined, decreases and resets the target block error rate. The method of claim 13, And the analyzing unit determines whether the transmission power value is less than a threshold power value, and if the threshold power value is less than the threshold power value, increases and resets the target block error rate. The method of claim 13, The reset target block error rate is transmitted to the terminal through the base station by using a reconfiguration message. The terminal obtains the reset target block error rate from the reset message, and performs power control internally according to the obtained target block error rate.

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