KR101478108B1 - System and method for delay compensation of power control in wireless Communication systems - Google Patents

Abstract

In the present invention, when a transmitting side transmits a packet to a receiving side, the receiving side determines the signal quality of the packet and transmits the transmission power control (TPC) information to the transmitting side. When the transmitting side receives the TPC information received from the receiving side and the power control delay And more particularly, to a power control delay time compensation method and system in a wireless communication system, which can compensate for a change in transmission power based on time.
A power control delay time compensation system according to the present invention is a system for transmitting packet data to a base station, receiving transmission power control (TPC) information for the packet data from the base station, and based on the TPC information and a power control delay time A user terminal that compensates for an increase or decrease in transmit power; And receiving the packet data from the user terminal, calculating a signal quality (Eb / NO) of the received packet data, determining the TPC information based on the signal quality, and transmitting the determined TPC information to the user terminal, And a base station that receives packet data whose transmission power is compensated based on TPC information and a power control delay time.
According to the present invention, the transmission side can compensate for the transmission power change based on the TPC information and the power control delay time transmitted from the reception side. In addition, since excessive increase and decrease in transmission power due to the power control delay time can be quickly compensated, rapid and efficient power control is possible. In addition, since only the operation of the transmission side is changed as compared with the conventional system, it can be easily reflected in the conventional system.

Description

TECHNICAL FIELD The present invention relates to a method and system for compensating power control delay time in a wireless communication system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power control delay time compensation method and system in a wireless communication system, and more particularly, to a system and method for compensating power control delay time in a wireless communication system, , Hereinafter referred to as " TPC ") information to the transmitter, and compensates for a change in transmission power based on the TPC information and the power control delay time transmitted from the receiver. And a system.

In general, a code division multiple access (CDMA) scheme shares the same frequency band with a large number of subscribers. In a CDMA receiver, all signals must arrive at the receiver at approximately the same power so as to reduce the interference effects of each other. Otherwise, the signal may be overburdened by other signals. Therefore, accurate power control is required in CDMA.

In general CDMA, power control can be divided into open-loop power control and inner closed-loop power control. The open loop power control is to determine the initial output of the terminal in response to a call initiation or a call to the base station in the uplink state in the absence of a communication link and the quality of the signal received by the terminal or the base station The target Eb / N0 (ratio of energy to noise spectral density) is set to be constant and the receiver transmits a power control command to the transmitter so that this value is maintained.

In the CDMA system, when the terminal transmits information at an initially set power, the base station calculates Eb / N0 (ratio of bit energy to noise spectral density) based on the received power. Since the Eb / N0 of the received signal is closely related to the probability of successful receipt of data, the base station usually sets the target value of Eb / N0 that it receives. If the received Eb / N0 is smaller than the target Eb / N0, the base station sends a command to the terminal to increase the power of the received signal. On the other hand, if the received value is greater than the target Eb / N0, the base station receives an excessive intensity signal and sends a command to the terminal to lower the transmit power. The closed loop power control can be similarly applied to a direction in which a base station transmits a packet to a mobile station.

Generally, in a commercial mobile communication system, the power of a counterpart is controlled using 1-bit information. This information is called a transmit power control (TPC) bit. When set to 1, it means a command to increase power. When it is set to 0, it means command to decrease power. The TPC can be transmitted at a high frequency so that it can adapt to a very rapidly changing radio channel environment. For example, an IS-95 CDMA system transmits 800 TPCs per second and a WCDMA system transmits 1500 times per second. In particular, one frame is subdivided into a plurality of time slots. In general, since the TPC is determined by estimating Eb / N0 every slot and the TPC is transmitted to the other party, the power control is performed every slot .

FIG. 1 is a diagram showing a change in received power according to a conventional power control delay.

Referring to FIG. 1, there is shown a change in received power when the power control delay time D is 3 slots. Even if a stable channel without signal attenuation is assumed, the intensity of the received power can be seen to rise and fall around the reference value as shown in FIG.

On the receiving side, TPC is generated to lower when the signal is received at a higher power than the reference value, and TPC is generated when the signal is received at lower power (arrow in FIG. 1).

In FIG. 1, since the reception power of the first slot is higher than the reference, a TPC to be lowered occurs. Likewise, the time at which the TPC referred to as height is reflected will also be after 3 slots.

Considering this process, when D = 3, the period of returning to the initial received power is 10 slots. In addition, assuming that the transmit power is adjusted by 1 dB, the fluctuation of the received power caused by the power control delay is 5 dB at maximum. This phenomenon can be exacerbated as the power control delay time D becomes longer. Assuming that the received power close to the reference value is the most preferable, in the above example, only four of the ten transmission powers included in one period are appropriate values.

As the power control delay time becomes longer, the transmission power and the reception power may fluctuate excessively, and therefore, there is a problem that the transmission side transmits packets with unnecessarily high power or unnecessarily low power.

An object of the present invention to solve the above-described problems is to provide a method and apparatus for transmitting a TPC information to a transmitting side by determining a signal quality of a packet at a receiving side when a transmitting side transmits a packet to a receiving side, A method and system for compensating power control delay time in a wireless communication system, which can solve the problem of excessively increasing or decreasing transmission power by compensating a change in transmission power based on a control delay time, a user terminal and its power control A delay time compensation method, a base station, and a power control delay time compensation method.

According to an aspect of the present invention, there is provided a power control delay time compensation system including: a base station for transmitting packet data to a base station, receiving transmission power control (TPC) information for the packet data from the base station, A user terminal for compensating for an increase or decrease in transmission power based on a power control delay time; And receiving the packet data from the user terminal, calculating a signal quality (Eb / NO) of the received packet data, determining the TPC information based on the signal quality, and transmitting the determined TPC information to the user terminal, And receiving the compensated packet data based on the TPC information.

According to another aspect of the present invention, there is provided a user terminal comprising: a communication unit for communicating with a base station through a communication network; A packet transmission unit for generating packet data to be transmitted to the base station and transmitting the generated packet data to the base station; A transmission power processor for increasing or decreasing a transmission power for transmitting the packet data; (TPC) information received from the base station at the time of transmission of the packet data, in accordance with a power control delay time (D) And a control unit for compensating and controlling the power.

In addition, the control unit reduces or increases the transmission power based on the received TPC information and the power control delay time to compensate for the decrease in the reception power variation period of the power control.

Also, when the received TPC information is the same as the previous TPC information, the control unit increases or decreases the transmission power by Δ (dB), which is a basic fluctuation range.

Also, the controller compensates the transmission power based on the power control delay time (D) when the received TPC information is different from the previous TPC information.

In addition, the control unit may set the transmission power to be D (dB) using the power control delay time D and the basic variation width DELTA (dB) when the received TPC information is the command (1) -1) * Δ (dB) or D * Δ (dB).

If the received TPC information is an instruction (0) to lower the transmission power, the control unit sets the transmission power to be D (dB) using the power control delay time (D) -1) * Δ (dB) or D * Δ (dB).

According to another aspect of the present invention, there is provided a base station including: a communication unit for communicating with a user terminal through a communication network; A packet processing unit for processing packet data transmitted from the user terminal and received through the communication unit; A quality estimator for estimating a signal quality of the received packet data; A TPC determination unit for determining transmission power control (TPC) information based on the estimated signal quality; A controller for transmitting the TPC information on the packet data to the user terminal when the packet data is received and receiving packet data after the transmission power is compensated based on the TPC information from the user terminal; And a storage unit for storing the received packet data, the estimated signal quality value, and the determined TPC information.

Then, the control unit transmits the instruction (1) for increasing the transmission power or the instruction (0) for decreasing the transmission power to the user terminal by including it in the TPC information.

According to another aspect of the present invention, there is provided a method for compensating power control delay time in a system for transmitting packet data from a user terminal to a base station, the method comprising: (a) Transmitting packet data to a base station; (b) the base station calculating a signal quality (Eb / NO) of the received packet data; (c) determining the transmission power control (TPC) information based on the calculated signal quality and transmitting the information to the user terminal; And (d) compensating for the increase or decrease in transmission power based on the received TPC information and the power control delay time.

According to another aspect of the present invention, there is provided a method of compensating power control delay time of a user terminal for transmitting packet data through a communication network to a base station, And transmitting the generated signal to the base station; (b) receiving transmission power control (TPC) information for the transmitted packet data from the base station; (c) compensating transmission power of the packet data based on transmission power control (TPC) information and power control delay time received from the base station.

In the step (c), the transmission power change period of the power control is reduced as the transmission power is increased or decreased based on the received TPC information and the power control delay time.

In the step (c), when the received TPC information is the same as the previous TPC information, the transmission power is increased or decreased by Δ (dB), which is a basic fluctuation range.

Also, the step (c) compensates the transmission power based on the power control delay time (D) when the received TPC information is different from the previous TPC information.

In the step (c), when the received TPC information is an instruction (1) for increasing the transmission power, the transmission power (T) is calculated using the power control delay time (D) Is increased by (D-1) *? (DB) or D *? (DB).

In the step (c), when the received TPC information is an instruction (0) for decreasing the transmission power, the transmission power is reduced by using a power control delay time (D) Is reduced by (D-1) *? (DB) or D *? (DB).

According to another aspect of the present invention, there is provided a method for compensating power control delay time of a base station receiving packet data from a user terminal through a communication network, the method comprising the steps of: (a) Receiving the packet data from the base station; (b) calculating a signal quality for the packet data; (c) determining transmission power control (TPC) information based on the calculated signal quality; And (d) transmitting the determined TPC information to the user terminal to compensate the transmission power of the packet data based on the determined TPC information and the power control delay time.

Also, the step (d) transmits the TPC information including the command (1) for increasing the transmission power or the command (0) for decreasing the transmission power to the user terminal.

After the step (d), the mobile station receives the next packet data from the user terminal with the transmission power compensated based on the determined TPC information and the power control delay time.

Further, when the TPC information transmitted to the user terminal is equal to the previous TPC information in the user terminal, the next packet data whose transmission power is increased or decreased by? (DB) .

In addition, when the TPC information transmitted to the user terminal is different from the previous TPC information in the user terminal, the next packet data with the transmission power compensated based on the power control delay time (D) is received.

(D-1) * DELTA (dB) or D * DELTA (dB) from the user terminal when the TPC information transmitted to the user terminal is an instruction (1) ) Of the next packet data.

(D-1) * DELTA (dB) or D * DELTA (dB) from the user terminal when the TPC information transmitted to the user terminal is an instruction (0) ) Of the next packet data.

The present invention can determine the transmission power change width in consideration of the power control delay time when the power control command is changed so as to compensate for the excessive transmission power increase or decrease caused by the power control delay time.

In addition, it is possible to compensate for the excessive transmission power change based on the TPC information and the power control delay time transmitted from the receiving side.

By using the present invention, it is possible to quickly compensate for excessive increase and decrease of the transmission power due to the power control delay time, thereby enabling quick and efficient power control. In addition, since only the operation of the transmission side is changed as compared with the conventional system, it can be easily reflected in the conventional system.

FIG. 1 is a diagram showing a change in received power according to a conventional power control delay.
2 is a diagram illustrating a delay time that can occur in the power control process according to the present invention.
3 is a diagram illustrating an example of the overall configuration of a power control delay time compensation system according to an embodiment of the present invention.
4 is a configuration diagram showing functional blocks of a user terminal as a transmitting side according to an embodiment of the present invention.
5 is a functional block diagram of a base station as a receiving side according to an embodiment of the present invention.
6 is a flowchart illustrating a power control delay time compensation method according to an embodiment of the present invention.
7 is a flowchart illustrating a method of compensating power control delay time of a user terminal according to an embodiment of the present invention.
8 is a flowchart illustrating a method of compensating power control delay time of a base station according to an embodiment of the present invention.
9 is a diagram illustrating a change in received power according to an embodiment of the present invention.
10 is a diagram illustrating a change in received power according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Generally, the power control technique uses a method of raising or lowering the power of the transmitting side by a predetermined fluctuation amount ΔdB based on the Eb / N0 of the received signal. If the distance between the transmitter and the receiver is very close, the receiver that received the packet will immediately return the TPC to the transmitter and the transmitter will be able to transmit the next packet with the modified power. However, since the transmission delay and the processing time of the radio wave occur in the actual system, the point at which the power control command is actually applied may be delayed somewhat.

2 is a diagram illustrating a delay time that can occur in the power control process according to the present invention.

Referring to FIG. 2, a Tx1 packet transmitted from a transmitter arrives at a receiver after a predetermined time Tt has elapsed due to a propagation delay time. The receiving side estimates Eb / N0 based on the received packet and determines the TPC based on the estimated Eb / N0. And the time required for the process for determining the TPC is represented by Tp. The receiving side transmits the TPC to the transmitting side, and the time taken in this process will be almost the same as Tt. In addition, since the TPC information transmitted by the receiving side must also be transmitted on a slot-by-slot basis, the TPC information needs to be transmitted in the next slot at the time of determination of the TPC. On the transmitting side, the TPC is extracted and the packet is transmitted using the new transmission power in the next slot after receiving the TPC.

As a result, the delay time required for the transmitting side to transmit the packet and to receive the TPC for the packet and to set the new value to the transmission power takes about 2Tt + Tp + Ts (Ts is the length of the slot). At this time, since the basic transmission unit of the packet is the slot, D representing the power control delay in the slot unit can be calculated by the following Equation 1.

For example, if Tt = 0.1 ms, Tp = 0.05 ms, and Ts = 0.6667 ms, D = 3 slots. That is, the power control command for the packet transmitted in the first slot is reflected in the fourth slot. Since the power control delay time D is influenced by Tt, Tp, and Ts, it can have various values depending on the conditions of the system.

3 is a diagram illustrating an example of the overall configuration of a power control delay time compensation system according to an embodiment of the present invention.

Referring to FIG. 3, the power control delay time compensation system 100 includes a base station 310, a communication network 320, and a user terminal 330.

The user terminal 330 transmits the packet data to the base station 310 and receives the transmission power control (TPC) information for the packet data from the base station 310 and transmits the transmission power based on the TPC information and the power control delay time Compensate.

The communication network 320 includes a CDMA 2000 1X, a cdma 2000 1x EV-DO, a WCDMA network, a TD-SCDMA, an HSDPA / HSUPA network, and the like as a mobile communication network.

Upon receiving the packet data from the user terminal 330, the base station 310 calculates the signal quality Eb / NO of the received packet data, determines the TPC information based on the signal quality Eb / NO and transmits the signal quality to the user terminal 330 And receives the compensated packet data based on the TPC information from the user terminal 330.

4 is a configuration diagram showing functional blocks of a user terminal as a transmitting side according to an embodiment of the present invention.

4, a user terminal 330 according to the present invention includes a communication unit 410, a packet transmission unit 420, a transmission power processing unit 430, a control unit 440, and a display unit 450.

The communication unit 410 communicates with the base station 310 through the communication network 320.

The packet transmitter 420 generates packet data to be transmitted to the base station 310 and transmits the generated packet data to the base station 310.

The transmission power processing unit 430 increases or decreases the transmission power to transmit the packet data.

The control unit 440 controls generation and transmission of packet data and controls the transmission power control unit 430 based on the transmission power control (TPC) information received from the base station 310 at the time of transmission of the packet data, (D).

In addition, as the control unit 440 increases or decreases the transmission power based on the TPC information received from the base station 310, the reception power variation period of the power control is reduced.

In addition, the control unit 440 increases or decreases the transmission power by Δ (dB), which is the basic fluctuation width, when the TPC information received from the base station 310 is the same as the previous TPC information.

The control unit 440 compensates the transmission power based on the power control delay time D when the TPC information received from the base station 310 is different from the previous TPC information.

That is, when the TPC information received from the base station 310 is an instruction (1) for increasing the transmission power, the controller 440 transmits (D-1) *? (DB) or D *? Increase power to compensate.

When the TPC information received from the base station 310 is an instruction (0) to lower the transmission power, the controller 440 sets the transmission power (D-1) * (dB) or D * To compensate.

The display unit 450 displays the packet data received through the communication unit 410. Also, the display unit 450 displays the operation status of the terminal.

In addition, the user terminal 330 may include an input unit having buttons such as letters, numerals, and symbols used for receiving or selecting commands or data from a user.

5 is a functional block diagram of a base station as a receiving side according to an embodiment of the present invention.

5, a base station 310 according to the present invention includes a communication unit 510, a packet processing unit 520, a quality estimation unit 530, a TPC determination unit 540, a control unit 550, and a storage unit 560 ).

The communication unit 510 communicates with the user terminal 330 through the communication network 320.

The packet processing unit 520 processes the packet data transmitted from the user terminal 330 and received through the communication unit 510.

The quality estimation unit 530 estimates the signal quality Eb / NO for the received packet data.

The TPC determination unit 540 determines transmission power control (TPC) information based on the estimated signal quality.

Upon receiving the packet data, the control unit 550 determines TPC information on the packet data and transmits the TPC information to the user terminal 330. Then, the control unit 550 receives the next packet data compensated based on the transmitted TPC information from the user terminal 330 .

The storage unit 560 stores the received packet data, the estimated signal quality value, the determined TPC information, and the like. For example, the storage unit 560 may be implemented in a database format.

If the TPC information transmitted to the user terminal 330 is the same as the previous TPC information in the user terminal 330, the control unit 550 determines whether the transmission power is increased or decreased by? (DB) .

In addition, when the TPC information transmitted to the user terminal 330 is different from the previous TPC information in the user terminal 330, the control unit 550 transmits the compensated packet data based on the power control delay time D . That is, when the TPC information transmitted to the user terminal 330 is an instruction (1) for increasing the transmission power, the controller 550 receives (D-1) *? (DB) or D * Receive packet data that is increased by Δ (dB). If the TPC information transmitted to the user terminal 330 is an instruction (0) for lowering the transmission power, the controller 550 receives (D-1) *? (DB) or D * Receive reduced packet data by? (DB).

6 is a flowchart illustrating a power control delay time compensation method according to an embodiment of the present invention.

Referring to FIG. 6, the user terminal 330 according to the present invention transmits packet data to the base station 310 (S610).

Accordingly, the base station 310 calculates the signal quality Eb / NO of the packet data received from the user terminal 330 (S620).

Then, the base station 310 determines transmission power control (TPC) information based on the calculated signal quality (S630), and transmits the determined TPC information to the user terminal 330 (S640).

Meanwhile, the user terminal 330 increases or decreases the transmission power based on the TPC information and the power control delay time received from the base station 310 (S650).

7 is a flowchart illustrating a method of compensating power control delay time of a user terminal according to an embodiment of the present invention.

Referring to FIG. 7, the user terminal 330 according to the present invention generates packet data and transmits the packet data to the base station 310 (S702).

Then, the user terminal 330 receives transmission power control (TPC) information for the transmitted packet data from the base station 310 (S704).

If the TPC information received from the base station 310 indicates that the transmission power is to be lowered (TPC = 0) (S706-Yes), the user terminal 330 transmits the received TPC information to the previous TPC (S708).

If the TPC information received from the base station 310 is the same as the previous TPC information (S710-Yes), the user terminal 330 instructs the transmission power to be lowered, so that (D-1) (DB) to compensate for the transmission power (S712).

In addition, if the TPC information received from the base station 310 is not identical to the previous TPC information (S710-No), the user terminal 330 compensates for the transmission power by reducing the transmission power by Δ (dB) ).

Meanwhile, if the TPC information received from the base station 310 indicates that the transmission power should be increased (TPC = 1) (S706-No), the user terminal 330 transmits the received TPC information to the TPC (Step S720).

At this time, when the TPC information received from the base station 310 is equal to the previous TPC information (S722-Yes), the user terminal 330 increases (D-1) * DELTA (dB) or D * DELTA Thereby compensating for the transmission power (S724).

In addition, if the TPC information received from the base station 310 is not identical to the previous TPC information (S722-No), the user terminal 330 compensates for the transmission power by increasing the transmission power by DELTA (dB) (S726).

Then, the user terminal 330 transmits the next packet data to the base station 310 with the transmission power compensated in steps S712, S714, S724, and S726 (S730).

When the service is terminated (S732-Yes), the packet transmission service operation is terminated. If the service is not terminated (S732-No), the flow returns to S704 in which TPC information on packet data is received from the base station 310 .

Accordingly, the transmission power change period of the power control is reduced as the transmission power is increased or decreased based on the TPC information received from the base station 310 and the power control delay time.

8 is a flowchart illustrating a method of compensating power control delay time of a base station according to an embodiment of the present invention.

Referring to FIG. 8, the base station 310 according to the present invention first receives packet data from the user terminal 330 (S810).

Next, the base station 310 estimates the signal quality of the received packet data through the quality estimation unit 530 (S820).

The base station 310 then determines transmission power control (TPC) information based on the estimated signal quality (S830).

The base station 310 transmits the determined TPC information to the user terminal 330 so that the user terminal 330 compensates for the transmission power of the packet data based on the determined TPC information and the power control delay time (S840).

The base station 310 then receives the next packet data from the user terminal 330 with the compensated transmission power based on the determined TPC information (S850).

In addition, if the TPC information transmitted to the user terminal 330 is the same as the previous TPC information in the user terminal 330, the base station 310 may increase or decrease the transmission power by Δ (dB) And receives the next packet data.

In addition, if the TPC information transmitted to the user terminal 330 is different from the previous TPC information in the user terminal 330, the base station 310 transmits the compensated next packet data based on the power control delay time D .

In addition, the base station 310 may determine (D-1) * (dB) or D * (dB) from the user terminal 330 when the TPC information transmitted to the user terminal 330 is command (1) And receives the next packet data that is increased by? (DB).

If the TPC information transmitted to the user terminal 330 is an instruction (0) for decreasing the transmission power, the base station 310 transmits (D-1) *? (DB) or D * And receives the next packet data that has been reduced by? (DB).

The value of TPC is characterized in that a specific command lasts for a certain period of time because of the power control delay time (D). Therefore, if the TPC value is different from the previous one, there is a high possibility that the same TPC is transmitted by the previous D slots. In order to quickly return the received power to the reference value, it is necessary to set the power fluctuation width larger than before because it must be possible to quickly compensate the previously increased or decreased power.

The appropriate range of variation is to increase or decrease (D-1) * Δ (dB) or D * Δ (dB) based on the power control delay time of the system. According to this method, the received power quickly approaches the mood value and has a value close to the reference value even in the following slot.

9 is a diagram illustrating a change in received power according to an embodiment of the present invention.

Referring to FIG. 9, when the value of TPC is changed, the variation width of the transmission power is set to (D-1) *? (DB). The transmitting user terminal 330 increases the transmission power by Δ each time until it receives three consecutive TPCs = 0. However, when TPC = 1, the TPC is changed. Therefore, the transmission power is decreased by (D-1) *? DB = 2? DB in order to compensate for the increase in the previous transmission power. Through this process, the received power becomes very close to the reference value. In addition, the reception power close to the reference value can be expected in the subsequent slot. If TPC = 0 is received again after the following three consecutive TPC = 1 commands, the transmitting user terminal 330 increases the transmit power by 2 [Delta] dB to compensate for the previous excessive transmit power reduction.

According to the method proposed by the present invention, the repetition period of the received power is reduced from 10 slots to 8 slots as shown in FIG. The repetition period is reduced and the received power close to the reference value for one period is still maintained for 4 slots, so that the power control is faster than the conventional method.

10 is a diagram illustrating a change in received power according to another embodiment of the present invention.

Referring to FIG. 10, when the value of TPC is changed, the variation width of the transmission power is set to D * .DELTA.db. Accordingly, the transmitting side user terminal 330 whose TPC value is different increases or decreases the transmission power by D *? DB in order to compensate for the previous transmission power change. The advantage of this method is that it further reduces the period of change in received power of the power control. For example, in the case of D = 3 slots, the received power change period becomes six slots.

As described above, according to the present invention, when a transmitting side transmits a packet to a receiving side, the receiving side determines the signal quality of the packet and transmits the TPC information to the transmitting side, and the transmitting side receives the TPC information and the power control delay time A method and system for compensating power control delay time in a wireless communication system, which solves the problem of excessively increasing or decreasing the transmission power by compensating for a change in transmission power based on the power control delay time , The base station and its power control delay time compensation method can be realized.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

The present invention can be applied to all mobile communication systems that utilize rapid power control technology. In particular, the present invention can be applied to GSM technology including power control, second generation (G) mobile communication technology (IS-95), third generation (cdma2000 1x, cdma2000 1xEV-DO, WCDMA / HSDPA / HSUPA, etc.) and 4th generation mobile communication technology.

300: power control delay time compensation system 310: base station
320: communication network 330: user terminal
410: communication unit 420: packet transmission unit
430: Transmission power processor 440:
450: display unit 510:
520: packet processor 530: quality estimator
540: TPC decision unit 550:
560:

Claims (18)

A user terminal for transmitting packet data to a base station, receiving transmission power control (TPC) information for the packet data from the base station and compensating for an increase or decrease in transmission power based on the TPC information and a power control delay time; And
(Eb / NO) of the received packet data, determines the TPC information based on the signal quality (Eb / NO), and transmits the TPC information to the user terminal, The base station receiving the packet data transmitted with the compensated transmission power based on the information
/ RTI >
The user terminal determines that the power control delay time (D) is greater than the basic fluctuation value DELTA (dB) and less than the basic fluctuation DELTA (dB) when the received TPC information is different from the previous TPC information And the transmission power is increased or decreased by a variation width obtained by multiplying the transmission power by a predetermined value determined based on the transmission power. A communication unit for communicating with a base station via a communication network;
A packet transmission unit for generating packet data to be transmitted to the base station and transmitting the generated packet data to the base station;
A transmission power processor for increasing or decreasing a transmission power for transmitting the packet data; And
(TPC) information received from the base station at the time of transmission of the packet data, and controls transmission and reception of the transmission data according to a power control delay time (D) A controller for compensating and controlling power;
/ RTI >
Wherein the control unit is configured to determine whether the received TPC information is different from the previous TPC information by a value larger than a basic fluctuation width DELTA (dB) and based on the basic fluctuation DELTA (dB) And the transmission power is compensated for by a variation width obtained by multiplying the transmission power by a predetermined value. 3. The method of claim 2,
Wherein the controller compensates the transmission power by increasing or decreasing the transmission power by? (DB), which is a basic fluctuation width, when the received TPC information is the same as the previous TPC information. delete 3. The method of claim 2,
The control unit sets the transmission power to (D-1) by using the power control delay time (D) and the basic fluctuation range DELTA (dB) when the received TPC information is the instruction (1) ) * DELTA (dB) or D * DELTA (dB). 3. The method of claim 2,
The control unit sets the transmission power to (D-1) using a power control delay time (D) and a basic fluctuation range DELTA (dB) when the received TPC information is an instruction (0) ) * [Delta] (dB) or D * [Delta] ([dB]). A communication unit for communicating with a user terminal through a communication network;
A packet processing unit for processing packet data transmitted from the user terminal and received through the communication unit;
A quality estimator for estimating a signal quality of the received packet data;
A TPC determination unit for determining transmission power control (TPC) information based on the estimated signal quality;
A controller for transmitting the TPC information on the packet data to the user terminal when the packet data is received and receiving packet data after the transmission power is compensated based on the TPC information from the user terminal; And
A storage unit for storing the received packet data, the estimated signal quality value, and the determined TPC information;
/ RTI >
The user terminal is a value that is larger than a basic fluctuation width DELTA (dB) when the TPC information received from the base station is different from the previous TPC information, and the power control delay time DELTA (dB) And transmits the packet data by compensating the transmission power by a variation width by multiplying a predetermined value determined based on the transmission power. 8. The method of claim 7,
Wherein the controller transmits the command (1) for increasing the transmission power or the command (0) for decreasing the transmission power to the user terminal by including the TPC information in the TPC information. A method for compensating power control delay time of a system for transmitting packet data from a user terminal to a base station,
(a) transmitting the packet data to the base station by the user terminal;
(b) calculating the signal quality (Eb / NO) of the packet data received by the base station;
(c) determining the transmission power control (TPC) information based on the calculated signal quality and transmitting the information to the user terminal; And
(d) compensating for an increase or decrease in transmission power based on the TPC information and the power control delay time of the user terminal;
/ RTI >
Wherein the step (d) includes the step of, if the received TPC information is different from the previous TPC information, a value larger than a basic fluctuation width DELTA (dB) To compensate for an increase or a decrease of the transmission power by a variation of a value obtained by multiplying a predetermined value based on the transmission power. A power control delay time compensation method of a user terminal for transmitting packet data through a communication network to a base station,
(a) generating packet data and transmitting the packet data to the base station;
(b) receiving transmission power control (TPC) information for the transmitted packet data from the base station; And
(c) compensating transmission power of the packet data based on transmission power control (TPC) information and power control delay time received from the base station;
/ RTI >
Wherein the step (c) includes the step of, if the received TPC information differs from the previous TPC information, a value larger than a basic fluctuation width DELTA (dB) To compensate for the transmission power by multiplying the transmission power by a predetermined value multiplied by a predetermined value determined based on the power control delay time of the user terminal. 11. The method of claim 10,
Wherein the step (c) comprises compensating the transmission power by increasing or decreasing the transmission power by a fundamental variation width DELTA (dB) when the received TPC information is the same as the previous TPC information. Time compensation method. delete 11. The method of claim 10,
Wherein the step (c) further comprises the step of, when the received TPC information is an instruction (1) to increase the transmission power, transmit the transmission power by using the power control delay time (D) D-1) * [Delta] (dB) or D * [Delta] ([dB]). 11. The method of claim 10,
Wherein the step (c) further comprises the step of calculating the transmission power by using the power control delay time (D) and the basic fluctuation range DELTA (dB) when the received TPC information is the command (0) D-1) *? (DB) or D *? (DB). A method for compensating power control delay time of a base station receiving packet data from a user terminal through a communication network,
(a) receiving the packet data from the user terminal;
(b) calculating a signal quality for the packet data;
(c) determining transmission power control (TPC) information based on the calculated signal quality; And
(d) transmitting the determined TPC information to the user terminal so that the user terminal compensates transmission power of the packet data based on the determined TPC information and the power control delay time;
/ RTI >
In step (d), when the TPC information received from the base station is different from the previous TPC information, the user terminal has a value larger than the basic fluctuation width Δ (dB), and the basic fluctuation width Δ (dB) And compensates the transmission power by a variation width obtained by multiplying a predetermined value determined based on the power control delay time (D) to transmit the packet data. 16. The method of claim 15,
Wherein the step (d) comprises transmitting the TPC information including the command (1) for increasing the transmission power or the command (0) for decreasing the transmission power to the user terminal. Compensation method. A computer-readable medium having a program recorded thereon a method for compensating power control delay time of a user terminal according to any one of claims 10, 11, 13 and 14. A computer-readable medium having a program recorded thereon a method for compensating power control delay time of a base station according to claim 15 or 16.

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