KR20110094589A - System and method for delay compensation of power control in wireless communication systems - Google Patents

Abstract

PURPOSE: A system and method for compensating a delay of power control in a wireless communication system are provided to compensate the changes of transmission power based on TPC(Transmit Power Control) information and the power control delay time. CONSTITUTION: A packet transmitting unit(420) creates a packet data. The packet transmitting unit transmits the packet data to a base station. A transmitting power processing unit(430) increase or reduces the transmission power for transmitting the packet data. A controller(440) controls the creation and the transmission of the packet data. The controller compensates the transmission power by the power control delay time by the transmitting power processing unit.

Description

System and method for delay compensation of power control in wireless communication systems

The present invention relates to a power control delay time compensation method and system in a wireless communication system. More particularly, when a transmitting side transmits a packet to a receiving side, the receiving side determines the signal quality of the packet and transmit power control. In this case, the TPC information is transmitted to the transmitting side, and the transmitting side can compensate for the change in transmission power based on the TPC information received from the receiving side and the power control delay time. And to the system.

In general, code division multiple access (CDMA) schemes share the same frequency band with multiple subscribers. In a CDMA receiver, all signals must reach the receiver at approximately the same power to reduce the effects of interference. Otherwise, the signal may be overly buried in other signals. Therefore, accurate power control is required in CDMA.

In the general CDMA scheme, power control may be classified into open-loop power control and inner closed-loop power control. Open loop power control determines the initial output of the terminal when a call is initiated uplink or a base station is answered without a communication link. The closed loop power control determines the quality of a signal received by the terminal or the base station. The target Eb / N0 (ratio of bit energy to noise spectral density) value is set to be constant, and the receiver transmits a power control command to the transmitter so that the value is maintained.

In the process of controlling the transmission power of the terminal in the CDMA system, when the terminal transmits information with the power initially set, the base station calculates the ratio of bit energy to noise spectral density (Eb / N0) based on the received power. Since Eb / N0 of the received signal is closely related to the reception success probability of the data, the base station usually sets a target value of Eb / N0 that it receives. This value is denoted as target Eb / N0. If the received Eb / N0 is smaller than the target Eb / N0, the base station sends a command to increase power to the terminal in order to increase the strength of the received signal. On the contrary, if the reception value is larger than the target Eb / N0, the base station receives a signal of excessive strength and sends a command to lower the transmission power to the terminal. Such closed loop power control can be equally applied to a direction in which a base station sends a packet to a terminal.

In general, a commercial mobile communication system controls the power of the other party using one bit of information. This information is called a transmit power control (TPC) bit. If set to 1, it means power up. If set to 0, it corresponds to power down. The TPC can be transmitted at high frequency to adapt to a 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 divided into a plurality of slots (time slots). In general, power control is performed in units of slots because the TPC is determined by estimating Eb / N0 for each slot unit and the TPC is transmitted to the other side. Can be.

1 is a diagram illustrating a change in reception power according to a conventional power control delay.

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

The receiving side generates a TPC to lower when a signal is received at a higher power than a reference value, and generates a TPC to be height when received at a low power (arrow of FIG. 1).

In Fig. 1, since the received power of the first slot is higher than the reference, a TPC occurs to lower, but the time when this command is applied is 3 slots later. Similarly, the time when the height of TPC is reflected will be three slots later.

Considering this process, when D = 3, the period of returning to the initial reception power becomes 10 slots. In addition, assuming that the transmission power is adjusted by 1 dB, the fluctuation range of the received power caused by the power control delay is 5 dB at maximum. This phenomenon may be intensified as the power control delay time D increases. In addition, assuming that reception power close to the reference value is most preferred, in the above example, only four powers out of ten transmission powers included in one period may be regarded as appropriate values.

Since the transmission power and the reception power may fluctuate excessively when the power control delay time is long, the transmitting side has a problem of transmitting packets with unnecessarily high power or unnecessarily low power.

An object of the present invention for solving the above-described problems, when the transmitting side transmits the packet to the receiving side, the receiving side determines the signal quality of the packet and delivers the TPC information to the transmitting side, the TPC information and power received by the transmitting side By compensating for the change in transmission power based on the control delay time, a method and system for compensating power control delay time in a wireless communication system, a user terminal, and power control thereof can solve the problem of excessively high or low transmission power. A delay compensation method, a base station and a power control delay compensation method thereof are provided.

In accordance with another aspect of the present invention, a power control delay time compensation system transmits packet data to a base station, receives transmission power control (TPC) information on the packet data from the base station, and transmits the packet data to the TPC information. A user terminal for compensating for an increase or a decrease in transmission power based on a power control delay time; And when the packet data is received from the user terminal, calculates a signal quality (Eb / NO) of the received packet data, determines the TPC information based on this, and transmits the TPC information to the user terminal. It includes a base station for receiving the compensated packet data based on the TPC information.

On the other hand, the user terminal according to the present invention for achieving the above object, the communication unit for communicating via the communication network with the base station; A packet transmitter for generating packet data to be transmitted to the base station and transmitting the generated packet data to the base station; A transmission power processing unit for increasing or decreasing transmission power for transmitting the packet data; And controlling the generation and transmission of the packet data, and transmitting the power according to a power control delay time D through the power processor based on transmission power control (TPC) information received from the base station when the packet data is transmitted. And a control unit for compensating and controlling power.

In addition, as the control unit increases or decreases the transmission power based on the received TPC information and the power control delay time, the reception power change cycle of the power control is reduced.

In addition, when the received TPC information is the same as the previous TPC information, the controller increases or decreases the transmission power by a basic variation Δ (㏈) to compensate.

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

In addition, when the received TPC information is a command (1) to increase the transmission power, the control unit uses the power control delay time (D) and a basic variation range Δ (㏈) to obtain the transmission power (D). -1) Compensation by increasing by * Δ (㏈) or D * Δ (㏈).

When the received TPC information is a command (0) for lowering the transmission power, the controller controls the transmission power by using a power control delay time (D) and a default variation Δ (㏈). -1) Compensate by decreasing by * Δ (㏈) or D * Δ (㏈).

On the other hand, the base station according to the present invention for achieving the above object, a communication unit for communicating with the user terminal through a communication network; A packet processor which processes the 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 determiner configured to determine transmission power control (TPC) information based on the estimated signal quality; A control unit for transmitting the TPC information about the packet data to the user terminal when the packet data is received, and receiving the next packet data whose 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.

The controller transmits a command (1) for increasing the transmission power or a command (0) for lowering the transmission power in the TPC information to the user terminal.

On the other hand, the power control delay time compensation method according to the present invention for achieving the above object, in the power control delay time compensation method of a system for transmitting packet data from the user terminal to the base station, (a) the user terminal is Transmitting packet data to a base station; (b) the base station calculating signal quality (Eb / NO) of the received packet data; (c) determining, by the base station, transmission power control (TPC) information based on the calculated signal quality and transmitting it to the user terminal; And (d) compensating for the increase or decrease of transmission power by the user terminal based on the received TPC information and a power control delay time.

On the other hand, the power control delay time compensation method of the user terminal according to the present invention for achieving the above object, as a power control delay time compensation method of the user terminal for transmitting the packet data through the communication network to the base station, (a) packet data Generating and transmitting to the base station; (b) receiving transmission power control (TPC) information for the transmitted packet data from the base station; (c) compensating for transmission power of the packet data based on transmission power control (TPC) information and power control delay time received from the base station.

Also, in the step (c), the period of change in the received power of the power control is reduced by increasing or decreasing the transmission power based on the received TPC information and the power control delay time.

Further, 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 a basic variation Δ (㏈) to compensate.

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

Also, in the step (c), when the received TPC information is a command (1) to increase the transmission power, the transmission power using the power control delay time (D) and a basic variation Δ (㏈). To compensate by increasing (D-1) * Δ (㏈) or D * Δ (㏈).

And, in the step (c), when the received TPC information is a command (0) to lower the transmission power, the transmission power using the power control delay time (D) and the basic variation Δ (㏈) To compensate by reducing (D-1) * Δ (㏈) or D * Δ (㏈).

On the other hand, the power control delay time compensation method of the base station according to the present invention for achieving the above object is a power control delay time compensation method of the base station for receiving packet data from the user terminal through a communication network, (a) the user terminal Receiving the packet data from; (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, by the user terminal, the determined TPC information to the user terminal to compensate for the transmission power of the packet data based on the determined TPC information and the power control delay time.

In the step (d), the TPC information including the command (1) to increase the transmission power or the command (0) to lower the transmission power is transmitted to the user terminal.

In addition, after the step (d), the next packet data is received from the user terminal with the transmission power compensated based on the determined TPC information and the power control delay time.

In addition, when the TPC information transmitted to the user terminal is the same as the previous TPC information in the user terminal, the next packet data of which the transmission power is increased or decreased compensated by a basic variation Δ (㏈) is received. .

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 of which the transmission power is compensated based on a power control delay time D is received.

Further, when the TPC information transmitted to the user terminal is a command (1) to increase the transmission power, the transmission power from the user terminal is (D-1) * Δ (㏈) or D * Δ (㏈ Receive the next packet data incrementally compensated by).

When the TPC information transmitted to the user terminal is a command (0) to lower the transmission power, the transmission power is (D-1) * Δ (㏈) or D * Δ (㏈) from the user terminal. Receive the next packet data that is reduced and compensated by

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 to compensate for the excessive increase or decrease in the transmission power caused by the power control delay time.

In addition, the transmitter may compensate for the excessive change in the transmit power based on the TPC information received from the receiver and the power control delay time.

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 fast and efficient power control. In addition, since only the operation on the transmitting side is changed in comparison with the conventional system, it can be easily reflected in the conventional system.

1 is a diagram illustrating a change in reception power according to a conventional power control delay.
2 is a diagram illustrating a delay time that may occur in a power control process according to the present invention.
3 is a view showing 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 block diagram showing a functional block of a user terminal as a transmitting side according to an embodiment of the present invention.
5 is a diagram illustrating a functional block 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 power control delay time compensation method of a user terminal according to an exemplary embodiment of the present invention.
8 is a flowchart illustrating a power control delay time compensation method of a base station according to an embodiment of the present invention.
9 is a view showing a change in reception power according to an embodiment of the present invention.
10 is a view showing a change in reception 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, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In general, the power control technique uses a method of increasing or decreasing the power of a transmitter by a predetermined variation ΔdB based on Eb / N0 of a received signal. If the distance between the transmitting side and the receiving side is very close, the receiving side which has received the packet may immediately return the TPC to the transmitting side, and the transmitting side may transmit subsequent packets with modified power. In actual systems, however, transmission delay and processing time of radio waves may occur, and thus the timing at which the power control command is actually applied may be delayed.

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

Referring to Fig. 2, the Tx1 packet transmitted from the transmitting side arrives at the receiving side after a certain time Tt has passed due to the propagation delay time. The receiving side estimates Eb / N0 based on the received packet and determines the TPC based on the received packet. The time taken for the treatment to determine the TPC is denoted Tp. The receiving side transmits the TPC to the transmitting side, and the time taken in this process will be almost similar to Tt. In addition, since the TPC information transmitted by the receiver must also be transmitted in units of slots, it needs to be transmitted in the next slot when the TPC is determined. The sender goes through the process of extracting the TPC, receives the TPC and transmits the packet using the new transmit power in the slot.

As a result, a delay time for transmitting a packet, receiving a TPC for the packet, and setting a new value to the transmit power takes at least 2Tt + Tp + Ts (Ts is the length of a slot). In this case, since the basic transmission unit of the packet is a slot, D representing the power control delay in slot units may be calculated as in Equation 1 below.

For example, if Tt = 0.1 ms, Tp = 0.05 ms, and Ts = 0.6667 ms, then D = 3 slots. That is, the power control command for the packet transmitted in slot 1 is reflected in slot 4. Since the power control delay time D is affected by Tt, Tp, and Ts, the power control delay time D may have various values depending on the system conditions.

3 is a view showing 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 according to the present invention includes a base station 310, a communication network 320, and a user terminal 330.

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

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

When the base station 310 receives the packet data from the user terminal 330, calculates the signal quality (Eb / NO) of the received packet data, determines the TPC information based on this and transmits to the user terminal 330, after The compensated packet data is received from the user terminal 330 based on the TPC information.

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

Referring to FIG. 4, the user terminal 330 according to the present invention includes a communication unit 410, a packet transmitter 420, a transmission power processor 430, a controller 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 processor 430 increases or decreases transmission power for transmitting packet data and processes the data.

The control unit 440 controls the generation and transmission of the packet data, and the power control delay time through the transmission power processing 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. Compensate and control the transmission power in accordance with (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 change cycle of the power control is reduced.

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

In addition, when the TPC information received from the base station 310 is different from the previous TPC information, the controller 440 compensates the transmission power based on the power control delay time (D).

That is, when the TPC information received from the base station 310 is a command (1) to increase the transmission power, the control unit 440 transmits by (D-1) * Δ (㏈) or D * Δ (㏈). Compensate by increasing power.

When the TPC information received from the base station 310 is a command (0) to lower the transmission power, the control unit 440 transmits power by (D-1) * Δ (-1) or D * Δ (㏈). To compensate.

The display unit 450 displays the packet data received through the communication unit 410. In addition, the display unit 450 displays an operation state of the terminal.

In addition, the user terminal 330 may include an input unit including buttons such as letters, numbers, and symbols used when receiving or selecting a command or data from a user.

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

Referring to FIG. 5, the base station 310 according to the present invention includes a communication unit 510, a packet processing unit 520, a quality estimating 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 processor 520 processes the packet data transmitted from the user terminal 330 and received through the communication unit 510.

The quality estimator 530 estimates a signal quality (Eb / NO) of the received packet data.

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

When the packet data is received, the controller 550 determines the TPC information about the packet data and transmits the packet data to the user terminal 330, and receives the next packet data compensated based on the transmitted TPC information from the user terminal 330. To control the operation.

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 the form of a database.

In addition, when the TPC information transmitted to the user terminal 330 is the same as the previous TPC information in the user terminal 330, the controller 550 increases or decreases the transmission power by Δ (㏈). Receive

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 controller 550 may compensate for the packet data compensated based on the power control delay time D. Receive. That is, when the TPC information transmitted to the user terminal 330 is a command (1) to increase the transmission power, the controller 550 (D-1) * Δ (㏈) or D from the user terminal 330. Receive packet data incrementally compensated by * Δ (㏈). Then, when the TPC information transmitted to the user terminal 330 is a command (0) to lower the transmission power, the control unit 550 (D-1) * Δ (㏈) or D from the user terminal 330. Receive the packet data reduced and compensated by [Delta] (k).

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).

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

Subsequently, 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).

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

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

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

Subsequently, the user terminal 330 receives TPC information about the transmitted packet data from the base station 310 (S704).

Subsequently, when the TPC information received from the base station 310 is a command to lower the transmission power (TPC = 0) (S706-Yes), the received TPC information is the previous TPC. It is determined whether the information is the same (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 is (D-1) * Δ (㏈) or D * Δ because the command to lower the transmission power. Compensate the transmission power by reducing by (i) (S712).

In addition, when the TPC information received from the base station 310 is not the same as the previous TPC information (S710-No), the user terminal 330 decreases and compensates the transmission power by Δ (㏈), which is a basic variation (S714). ).

Meanwhile, if the TPC information received from the base station 310 is a command to increase the transmission power (TPC = 1) (S706-No), the user terminal 330 receives the previous TPC information. It is determined whether the information is the same (S720).

At this time, the user terminal 330 increases by (D-1) * Δ (㏈) or D * Δ (㏈) when the TPC information received from the base station 310 is the same as the previous TPC information (S722-Yes). To compensate for the transmission power (S724).

In addition, if the TPC information received from the base station 310 is not the same as the previous TPC information (S722-No), the user terminal 330 increases the transmission power by Δ (㏈) to compensate (S726).

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

Then, if the service is terminated (S732-Yes), the packet transmission service operation is terminated, and if the service is not terminated (S732-No), return to step S704 to receive the TPC information for the packet data from the base station 310 Will be repeated.

Therefore, 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, the reception power change cycle of the power control is reduced.

8 is a flowchart illustrating a power control delay time compensation method 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).

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

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

Subsequently, the base station 310 transmits the determined TPC information to the user terminal 330 so that the user terminal 330 compensates 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 transmission power compensated based on the determined TPC information (S850).

In addition, when 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 is increased or decreased compensated by Δ (만큼), which is a basic fluctuation range. Receive the next packet data.

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 base station 310 compensates for the next packet data based on the power control delay time D. Receive.

Further, when the TPC information transmitted to the user terminal 330 is a command (1) to increase the transmission power, the base station 310 receives (D-1) * Δ (㏈) or D * from the user terminal 330. Receive the next packet data incrementally compensated by [Delta] (k).

When the TPC information transmitted to the user terminal 330 is a command (0) to lower the transmission power, the base station 310 receives (D-1) * Δ (㏈) or D * from the user terminal 330. Receive the next packet data which is compensated for by decreasing Δ (㏈).

The value of TPC is characterized by the fact that a certain command lasts for a certain period of time because of the power control delay time (D). Therefore, if the TPC value is different from before, it is highly likely 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 quickly compensate for the previously increased or decreased power, and therefore, it is necessary to set a larger power fluctuation than before.

Appropriate fluctuations include increasing or decreasing (D-1) * Δ (㏈) or D * Δ (㏈) based on the power control delay time of the system. According to this method, the received power rapidly approaches the mood value, and has a value close to the reference value in subsequent slots.

9 is a view showing a change in reception power according to an embodiment of the present invention.

Referring to FIG. 9, when the value of the TPC is changed, the fluctuation range of the transmission power is set to (D-1) * Δ (㏈). Each transmitting user terminal 330 increases the transmission power by Δ until receiving three consecutive TPC = 0. However, when TPC = 1, the TPC is changed, so that the transmit power is reduced by (D-1) * ΔdB = 2Δ dB to compensate for the previous increase in transmit power. Through this process, the received power is very close to the reference value. In addition, even in subsequent slots, a reception power close to a reference value can be expected. If TPC = 0 is received again after three consecutive TPC = 1 commands, the transmitting user terminal 330 increases the transmit power by 2Δ dB to compensate for the previous excessive decrease in transmit power.

According to the method proposed by the present invention, the repetition period of the received power is reduced from 10 conventional slots to 8 slots as shown in FIG. 9. Since the repetition period is reduced and the received power close to the reference value for one period is still maintained for 4 slots, faster power control is possible than the conventional method.

10 is a view showing a change in reception power according to another embodiment of the present invention.

Referring to FIG. 10, when the value of the TPC is changed, the fluctuation range of the transmission power is set to D * Δ dB. Accordingly, the transmitting user terminal 330 having a different TPC value increases or decreases the transmission power by D * Δ dB to compensate for the change in the previous transmission power. The advantage of this method is that it can further reduce the period of change of the received power of the power control. For example, in the case of D = 3 slots, the reception power change period is 6 slots.

As described above, according to the present invention, when the transmitting side transmits a packet to the receiving side, the receiving side determines the signal quality of the packet and delivers the TPC information to the transmitting side, and the transmitting side transmits the received TPC information and the power control delay time. By compensating for the change in transmission power on the basis of the power transmission delay compensation method and system, a user terminal and a power control delay compensation method thereof in the wireless communication system to solve the problem of excessively high or low transmission power The base station and its power control delay time compensation method can be realized.

As those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features, the embodiments described above should be understood as illustrative and not restrictive in all aspects. Should be. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

The present invention can be applied to all mobile communication systems using a fast power control technology, in particular GSM technology, including power control, second generation (G) mobile communication technology (IS-95), third generation (G) mobile communication technology (cdma2000 1x, cdma2000 1xEV-DO, WCDMA / HSDPA / HSUPA, etc.) and 4G 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: transmit power processing unit 440: control unit
450: display unit 510: communication unit
520: packet processing unit 530: quality estimation unit
540: TPC determination unit 550: control unit
560: storage unit

Claims (18)

A user terminal which transmits packet data to a base station and receives transmission power control (TPC) information on the packet data from the base station, and compensates for the increase or decrease of the transmission power based on the TPC information and the power control delay time; And
Upon receiving the packet data from the user terminal, the signal quality (Eb / NO) of the received packet data is calculated and based on this, the TPC information is determined and transmitted to the user terminal. Then, the TPC is transmitted from the user terminal. A base station that receives packet data transmitted with compensated transmission power based on the information
Power control delay time compensation system comprising a. A communication unit for communicating with a base station through a communication network;
A packet transmitter for generating packet data to be transmitted to the base station and transmitting the generated packet data to the base station;
A transmission power processing unit for increasing or decreasing transmission power for transmitting the packet data; And
Controls generation and transmission of the packet data, and transmits the transmission power according to a power control delay time (D) through the power processor based on transmission power control (TPC) information received from the base station when the packet data is transmitted. A control unit for compensating for the control;
Lt; / RTI > The method of claim 2,
The control unit, when the received TPC information is the same as the previous TPC information, characterized in that for increasing or decreasing the transmission power by a basic variation Δ (㏈) to compensate for. The method of claim 2,
The control unit, if the received TPC information is different from the previous TPC information, characterized in that for compensating the transmission power based on the power control delay time (D). The method of claim 2,
When the received TPC information is a command (1) to increase the transmission power, the controller controls the transmission power by using a power control delay time (D) and a basic variation Δ (㏈) (D-1). A user terminal, characterized in that by increasing by * Δ (㏈) or D * Δ (㏈). The method of claim 2,
When the received TPC information is a command (0) to lower the transmission power, the control unit uses the power control delay time (D) and a basic variation range Δ (㏈) to determine the transmission power (D-1). ) * Δ (감소) or D * Δ (㏈) to compensate for the user terminal. A communication unit communicating with a user terminal through a communication network;
A packet processor which processes the 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 determiner configured to determine transmission power control (TPC) information based on the estimated signal quality;
A control unit for transmitting the TPC information about the packet data to the user terminal when the packet data is received, and receiving the next packet data whose transmission power is compensated based on the TPC information from the user terminal; And
A storage unit which stores the received packet data, the estimated signal quality value, and the determined TPC information;
Base station comprising a. The method of claim 7, wherein
And the control unit includes a command (1) to increase the transmission power or a command (0) to lower the transmission power in the TPC information and transmits the same to the user terminal. In the power control delay time compensation method of a system for transmitting packet data from a user terminal to a base station,
(a) the user terminal transmitting packet data to the base station;
(b) the base station calculating signal quality (Eb / NO) of the received packet data;
(c) determining, by the base station, transmission power control (TPC) information based on the calculated signal quality and transmitting it to the user terminal; And
(d) compensating for the increase or decrease of transmission power by the user terminal based on the received TPC information and a power control delay time;
Power control delay time compensation method comprising a. A power control delay time compensation method of a user terminal for transmitting packet data to a base station through a communication network,
(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
compensating for transmission power of the packet data based on transmission power control (TPC) information and power control delay time received from the base station;
Power control delay time compensation method of a user terminal comprising a. The method of claim 10,
In the step (c), when the received TPC information is the same as the previous TPC information, the power control delay of the user terminal is increased or decreased by the basic variation, Δ (). Time compensation method. The method of claim 10,
In the step (c), when the received TPC information is different from the previous TPC information, the power control delay time compensation of the user terminal, characterized in that for compensating the transmission power based on the power control delay time (D). Way. The method of claim 12,
In the step (c), when the received TPC information is a command (1) for increasing the transmission power, the transmission power is determined using a power control delay time (D) and a basic variation Δ (㏈). D-1) * DELTA (㏈) or D * Δ (㏈) by increasing the power control delay time compensation method characterized in that the user terminal. The method of claim 12,
In the step (c), when the received TPC information is a command (0) to lower the transmission power, the transmission power is determined using a power control delay time (D) and a basic variation Δ (㏈). D-1) * Δ (㏈) or D * Δ (㏈) by reducing the power control delay time compensation method characterized in that the user terminal. A power control delay time compensation method 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, by the user terminal, the determined TPC information to the user terminal to compensate for the transmission power of the packet data based on the determined TPC information and a power control delay time;
Power control delay time compensation method of a base station comprising a. The method of claim 15,
In step (d), the power control delay time of the base station is characterized by transmitting the TPC information including the command to increase the transmission power (1) or the command to decrease the transmission power (0). Compensation method. A computer-readable medium recording a power control delay time compensation method of a user terminal according to any one of claims 10 to 14 as a program.
A computer-readable medium recording a power control delay time compensation method of a base station according to claim 15 in a program.

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