KR101115516B1 - Transmitter in the wireless communication system and power control method thereof - Google Patents

Transmitter in the wireless communication system and power control method thereof Download PDF

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Publication number
KR101115516B1
KR101115516B1 KR1020110002889A KR20110002889A KR101115516B1 KR 101115516 B1 KR101115516 B1 KR 101115516B1 KR 1020110002889 A KR1020110002889 A KR 1020110002889A KR 20110002889 A KR20110002889 A KR 20110002889A KR 101115516 B1 KR101115516 B1 KR 101115516B1
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South Korea
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transmission power
transmission
signal
value
transmitter
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KR1020110002889A
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Korean (ko)
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강충구
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고려대학교 산학협력단
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
    • H04B7/15535—Control of relay amplifier gain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention comprises the steps of: acquiring first transmit power information about a ratio of first transmit power of a first transmit signal transmitted from the neighbor transmitter to a first maximum transmit power of a neighbor transmitter; Acquiring second transmission power information about a ratio of second transmission power of a second transmission signal transmitted from the transmitter to a second maximum transmission power of the transmitter; And controlling a transmission power of the second transmission signal based on the first transmission power information and the second transmission power information.
As a result, the transmission power may be controlled to minimize the influence of the interference in the transmitter of the wireless communication system.

Description

TRANSMITTER IN THE WIRELESS COMMUNICATION SYSTEM AND POWER CONTROL METHOD THEREOF

The present invention relates to a transmitter of a wireless communication system, and more particularly to a transmitter of a wireless communication system that minimizes the effect of interference.

In general, a mobile communication system includes a plurality of base stations providing a wireless communication area called a "cell" and a mobile communication terminal located in a cell covered by each base station and receiving a mobile communication service through the base station. . In addition, a repeater is used to provide a smooth communication service to a terminal located in an area where signal quality is poor, such as an area outside a cell or a sound region.

When a base station of each cell of such a mobile communication system transmits a signal to a repeater or a terminal located in a corresponding cell, or a repeater transmits a signal to a terminal, the base station or repeater of an adjacent cell is affected by inter-cell interference. Therefore, when the base station transmits a signal to a terminal or the like, it is necessary to control the transmission power so that the terminal or the like can receive the signal smoothly and minimize interference between cells. Such inter-cell interference has been significantly overcome by adopting Orthogonal Frequency Division Multiplexing (OFDM) technology, but still remains a problem to be solved.

The present invention provides a transmitter in a wireless communication system capable of minimizing the effects of interference by providing information indicative of the effects of interference between adjacent transmitters.

In addition, the present invention provides a transmitter of a wireless communication system capable of controlling a transmission power so that the receiver can smoothly receive a signal and minimize the influence of interference.

The object according to the present invention includes the steps of: acquiring first transmit power information about a ratio of a first transmit power of a first transmit signal transmitted from the neighbor transmitter to a first maximum transmit power of a neighbor transmitter; Acquiring second transmission power information about a ratio of second transmission power of a second transmission signal transmitted from the transmitter to a second maximum transmission power of the transmitter; The transmission power of the second transmission signal may be controlled based on the first transmission power information and the second transmission power information.

The acquiring of the second transmission power information may include calculating the second transmission power based on channel gain information of the first transmission signal and the second transmission signal.

In addition, the channel gain information of the first transmission signal and the channel gain information of the second transmission signal may be fed back from the receiver.

The second transmission power may be calculated by multiplying a square root of the channel gain of the first transmission signal with respect to the channel gain of the second transmission signal by a constant.

The controlling of the transmission power may include transmitting the second transmission signal at the second maximum transmission power when the value of the second transmission power information is greater than the value of the first transmission power information. Can be.

The controlling of the transmission power may include changing the constant to a value obtained by dividing the constant by the value of the second transmission power information when the value of the second transmission power information is greater than the value of the first transmission power information. It may include.

The controlling of the transmission power may include dividing the constant by the value of the first transmission power information when the value of the second transmission power information is smaller than the value of the first transmission power information, and the second transmission signal. And transmitting the second transmission signal with the transmission power calculated by multiplying the square root of the channel gain of the first transmission signal by the channel gain of the signal.

The transmitting of the second transmission signal may include transmitting the second transmission signal at the minimum transmission power when the calculated transmission power is smaller than the minimum transmission power of the transmitter.

The controlling of the transmission power may include changing the constant to a value obtained by dividing the constant by the value of the first transmission power information when the value of the second transmission power information is smaller than the value of the first transmission power information. It may include.

In addition, the receiver may receive a signal from the transmitter, and may receive a maximum interference signal from the adjacent transmitter.

On the other hand, the object is, according to the present invention, a first communication unit for communicating with the adjacent transmitter;

A second communication unit for communicating with a receiver; First transmission power information regarding the ratio of the first transmission power of the first transmission signal transmitted from the neighboring transmitter to the first maximum transmission power of the neighboring transmitter and transmitted from the transmitter for the second maximum transmission power of the transmitter It can be achieved by the transmitter of the wireless communication system including a control unit for controlling the transmission power of the second transmission signal based on the second transmission power information about the ratio of the second transmission power of the second transmission signal.

The present invention can minimize the effect of interference by providing information indicating the effect of interference between adjacent transmitters to control the transmission power.

In addition, the present invention can control the transmission power in consideration of the transmission state of the transmitter and the interference from the adjacent transmitter, the receiver can smoothly receive the signal and can minimize the influence of the interference.

1 illustrates a wireless communication system in accordance with an embodiment of the present invention.
2 is a diagram illustrating a first base station of a wireless communication system according to an embodiment of the present invention.
3 illustrates a wireless communication system in accordance with another embodiment of the present invention.
4 is a diagram illustrating a first repeater of a wireless communication system according to another embodiment of the present invention.
5 illustrates a wireless communication system in accordance with another embodiment of the present invention.
6 illustrates a wireless communication system in accordance with another embodiment of the present invention.
7 is a flowchart illustrating operation of a wireless communication system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with the drawings. In the following description of the present invention, when it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a diagram illustrating a wireless communication system 10 according to an embodiment of the present invention.

Wireless communication system 10 according to an embodiment of the present invention may include a plurality of base stations and terminals, Figure 1 is a first base station 100, a second base station 110, a first terminal 120, Only the second terminal 130 and the like are shown.

In FIG. 1, the first terminal 120 is configured to communicate with the first base station 100, and the second terminal 130 is configured to communicate with the second base station 110, which is indicated by a solid line. Meanwhile, the dotted line corresponds to the interference signal, and the first terminal 120 receives the interference signal from the second base station 110 and the second terminal 130 from the first base station 100. At this time, the first terminal 120 and the second terminal 130 receives the interference signal from the other base stations except for the first base station 100 and the second base station 110, the first base station 100 and the second The maximum interference signal is received from the base station 110.

2 is a diagram illustrating a first base station 100 of a wireless communication system 10 according to an embodiment of the present invention.

In FIG. 2, the first communication unit 200 communicates with an adjacent base station including the second base station 110, the second communication unit 210 communicates with a receiver such as the first terminal 130, and the control unit 220. Controls the first base station 100 as a whole. Here, the plurality of base stations included in the wireless communication system 10 of the present embodiment may include a configuration that is the same as or similar to that of the first base station 100 illustrated in FIG. 2.

Hereinafter, an operation of the wireless communication system 10 according to the present embodiment will be described in detail with reference to FIGS. 1 and 2 based on the first base station 100 and the first terminal 120.

First, the first terminal 120 selects a base station transmitting the maximum interference signal among the interference signals received from the adjacent base station. To this end, the first terminal 120 may determine based on the average power strength or the average channel gain of the received interference signal. Here, the average power strength of the interference signal may be calculated as the product of the average channel gain of the interference signal and the transmission power of the base station transmitting the interference signal.

The first terminal 120 receives the average channel gain of the interference signal received from the second base station 110 (hereinafter, r 1 SR , I ) and the average channel gain of the signal received from the first base station 100 (hereinafter, r). 1 SR ), and the first base station 100 receives the information through the second communication unit 210. Subsequently, the controller 220 uses the Equation 1 to determine the transmit power (hereinafter, referred to as P 1 SR ) of the first base station based on the r 1 SR , I and r 1 SR received from the first terminal 120. Calculate. Here, the first terminal 120 may calculate the P 1 SR , and the first base station 100 may receive the P 1 SR from the first terminal 120.

In Equation 1, K is a constant shared between the first base station 100 and the second base station 110, and the controller 220 calculates the transmission power by changing the constant value as the degree of interference varies. .

&Quot; (1) "

Figure 112011002365349-pat00001

After calculating the P 1 SR , the controller 220 calculates a ratio of the maximum transmission power (hereinafter, referred to as P 1 SR, max ) of the first base station 100 and the calculated P 1 SR (hereinafter referred to as P 1 SR , offset ). It calculates using <Equation 2>. Here, P 1 SR , max may be predetermined.

<Equation 2>

Figure 112011002365349-pat00002

Further, the control unit 220 sends a P 1 SR, the offset, the first to the second base station 110 via the communication unit (200), P 1 SR, when the calculated offset.

On the other hand, the second terminal 130 is the average channel gain (hereinafter, r 2 SR , I ) of the interference signal received from the first base station 100 and the average channel gain of the signal received from the second base station 110 (hereinafter , r 2 SR ) is identified and transmitted to the second base station 110. Subsequently, the control unit (not shown) of the second base station 110 may transmit power (hereinafter, r 2 ) of the second base station 110 based on the r 2 SR , I and r 2 SR received from the second terminal 130. SR ) is calculated using Equation 3.

Here, the second terminal 130 may calculate the r 2 SR , and the second base station 110 may receive the r 2 SR from the second terminal 130.

 In Equation 3, K is a constant shared between the first base station 100 and the second base station 110, and the controller (not shown) of the second base station 110 has a constant value as the degree of interference varies. Change to calculate the transmit power.

&Quot; (3) &quot;

Figure 112011002365349-pat00003

After the control unit (not shown) of the second base station 110 calculates r 2 SR , the ratio of the maximum transmission power (hereinafter, referred to as P 2 SR and max ) of the second base station 110 and the calculated r 2 SR (hereinafter referred to as “no.”) Is calculated. , P 2 SR , offset ) is calculated using Equation 4. Herein, the maximum transmission power may be predetermined.

<Equation 4>

Figure 112011002365349-pat00004

When P 2 SR , offset is calculated, the controller (not shown) of the second base station 110 transmits P 2 SR , offset to the first base station 100. When the control unit 220 of the first base station 100 receives the P 2 SR , offset from the second base station 110 in the first communication unit 200, the control unit 220 compares the P 1 SR , offset with the P 2 SR , offset to obtain a first offset . 1 Controls the transmission power of the base station 100.

Referring to the transmission power control in detail, when P 1 SR , offset is larger than P 2 SR , offset , the controller 220 transmits a signal with P 1 SR , max , and Kn in Equation 1 is Kn. Replace with here,

Figure 112011002365349-pat00005

On the other hand, when P 1 SR and offset are smaller than P 2 SR and offset , the controller 220 calculates the transmission power P 1 SR and cal by using Equation 5 , and calculates the calculated P 1 SR and cal and 1 The transmission power is determined by comparing the minimum transmission power (hereinafter, referred to as P 1 SR , min ) at the base station 100. Ie P 1 SR , cal If P 1 SR , min is smaller than P 1 SR , min , the signal is transmitted. P 1 SR , cal is P 1 SR , min If it is larger than P 1 SR , send the signal to cal .

<Equation 5>

Figure 112011002365349-pat00006

Further, the control unit 220 to replace the K in <Equation 3> in the case where the P 1 SR, 2 SR offset is less than P, the offset Km. here,

Figure 112011002365349-pat00007

3 is a diagram illustrating a wireless communication system 10a according to another embodiment of the present invention.

The wireless communication system 10a according to the present embodiment may include a plurality of repeaters. In FIG. 3, the first repeater 300 and the second repeater 310 are illustrated.

The first repeater 300 receives a signal from the first base station 100a and transmits the signal to the first terminal 120a, and the second repeater 310 receives the signal from the second base station 110a to receive the signal. 130a). In addition, the first repeater 300 receives the interference signal from the second base station 110a, and the second repeater 310 receives the interference signal from the first base station 100a. In addition, the first terminal 120a receives the interference signal from the second repeater 310, and the second terminal 130a receives the interference signal from the first repeater 300. Here, the first terminal 120a and the second terminal 130a receive the interference signals from other repeaters except for the first repeater 300 and the second repeater 310, but the first repeater 300 and the second repeater. The maximum interference signal is received from the repeater 310. In addition, the first repeater 300 and the second repeater 310 receives an interference signal from another adjacent base station, but receives the maximum interference signal from the first base station 100a and the second base station 110a.

 Accordingly, the wireless communication system 10a according to the present embodiment has a transmission power for minimizing interference in the first base station 100a, the second base station 110a, the first repeater 300, and the second repeater 310. Control is required. Hereinafter, the operation of the wireless communication system 10a according to the present embodiment will be described based on the first base station 100a, the first repeater 300, and the first terminal 120a.

First, transmission power control in the first base station 100a is similar to that described with reference to FIGS. 1 and 2, but in the present embodiment, the interference signal that the first repeater 300 receives from the adjacent base station instead of the first terminal 120a is used. Select the base station transmitting the maximum interference signal. To this end, the first repeater 300 may determine the average power intensity or the average channel gain of the received interference signal. Here, the average power strength of the interference signal may be calculated as the product of the average channel gain of the interference signal and the transmission power of the base station transmitting the interference signal. In this embodiment, the average channel gain of the interference signal received from the mean channel gains (r 1, SR) and second base station (110a) of the signal received by the first repeater 300 from a first base station (100a), (r 1 SR , I ) is transmitted to the first base station 100a. In addition, the operation of the first base station 100a operates in the manner described with reference to FIGS. 1 and 2.

Next, referring to transmission power control in the first repeater 300, FIG. 4 is a diagram illustrating the first repeater 300 of the wireless communication system 10a according to the present embodiment. 1 communicates with the base station 100a, the second communication unit 410 communicates with the first terminal 120a, and the controller 420 controls the first repeater 300 as a whole. Here, the plurality of repeaters included in the wireless communication system 10a of the present embodiment may include a configuration that is the same as or similar to that of the first repeater 300 illustrated in FIG. 4.

The first terminal 120a selects a repeater that transmits the maximum interference signal among the interference signals received from the adjacent repeaters. To this end, the first terminal 120a may determine the average power intensity or the average channel gain of the received interference signal. Here, the average power strength of the interference signal may be calculated as the product of the average channel gain of the interference signal and the transmission power of the base station transmitting the interference signal.

The first terminal 120a receives an average channel gain (hereinafter, r 1 RD , I ) of the interference signal received from the second repeater 310 and an average channel gain (hereinafter, r) of the signal received from the first repeater 300. 1 RD ) is identified and transmitted to the first repeater 300. Thereafter, the controller 420 calculates the transmission power (hereinafter, referred to as P 1 RD ) of the first repeater 300 based on r 1 RD , I and r 1 RD received from the first terminal 120a. Calculate using Here, the first terminal 120a may calculate P 1 RD , and the first repeater 300 may receive from the first terminal 120a.

In Equation 6, W is a constant shared between the first repeater 300 and the second repeater 310, and the controller 420 calculates the transmission power by changing the constant value as the degree of interference varies. .

<Equation 6>

Figure 112011002365349-pat00008

After the controller 420 calculates P 1 RD , the controller 420 calculates a ratio of the maximum transmit power (hereinafter, referred to as P 1 RD, max ) of the first repeater 300 and the calculated P 1 RD (hereinafter referred to as P 1 RD , offset ). It calculates using <Equation 7>. Here, P 1 RD , max may be predetermined.

<Equation 7>

Figure 112011002365349-pat00009

Further, the control unit 420 sends a P RD 1, the offset, the first to the first base station (100a) via a communication unit (400), P 1 RD, when the calculated offset. The first base station 100a transmits P 1 RD , offset to the second base station 110a so that the second repeater 310 can control the transmission power using the P 1 RD , offset .

On the other hand, the second terminal 130a is the average channel gain (hereinafter, r 2 RD , I ) of the interference signal received from the first repeater 300 and the average channel gain of the signal received from the second repeater 310 (hereinafter , r 2 RD ) is grasped and transmitted to the second repeater 310. Subsequently, the control unit (not shown) of the second repeater 310 may transmit power (hereinafter, referred to as P 2 ) of the second repeater 310 based on the r 2 RD , I and r 2 RD received from the second terminal 130a. RD ) is calculated using Equation 8. In Equation 8, W is a constant shared between the first repeater 300 and the second repeater 310, and the controller (not shown) of the second repeater 310 has a constant value as the degree of interference varies. Change to calculate the transmit power.

<Equation 8>

Figure 112011002365349-pat00010

A second repeater (310) controller (not shown) of the P 2 after the calculation of RD, the second maximum transmission power of the repeater 310 (or less, P 2 RD, max) ratio of the P 2 RD calculated with (hereinafter referred to as , P 2 RD , offset ) is calculated using Equation 9. Herein, the maximum transmission power may be predetermined.

&Quot; (9) &quot;

Figure 112011002365349-pat00011

When P 2 RD , offset is calculated, the controller (not shown) of the second repeater 310 transmits P 2 RD , offset to the second base station 110a. The second base station 110a transmits P 2 RD , offset to the first base station 100a so that the first repeater 300 can control the transmission power using the P 2 RD , offset .

That is, when the control unit 420 of the first repeater 300 receives P 2 RD , offset from the first base station 100a in the first communication unit 400, the control unit 420 compares P 1 RD , offset with P 2 RD , offset . To control the transmit power.

First, when P 1 RD , offset is greater than P 2 RD , offset , the controller 420 transmits a signal with P 1 RD , max , and replaces W with Wn in Equation 6. here,

Figure 112011002365349-pat00012

On the other hand, when P 1 RD , offset is smaller than P 2 RD , offset , the controller 420 calculates the transmission power P 1 RD , cal using Equation 10 , and calculates the calculated P 1 RD , cal and The transmission power for transmitting the signal is determined by comparing the minimum transmission power (hereinafter, referred to as P 1 RD , min ) at the one repeater 300. That is, P 1 to RD, cal is P 1 RD, the case is smaller than min, the, P 1 RD, and cal to transmit a signal to the P 1 RD, min P 1 RD , it is larger than the min, the P 1 RD, cal Send a signal.

<Equation 10>

Figure 112011002365349-pat00013

In addition, when P 1 RD , offset is smaller than P 2 RD , offset , the controller 420 replaces W with Wm in Equation (8). here,

Figure 112011002365349-pat00014

On the other hand, P 1 RD , P 2 RD , P 1 RD , offset , P 2 RD , and offset may be calculated by the first base station 100a and the second base station 110a. That is, the first repeater 300 and the second repeater 310 are r 1 RD , I , r 1 RD transmitted from the first terminal 120a and the second terminal 130a. , r 2 RD , I , r 2 RD are transmitted to the first base station 100a and the second base station 110a, and in the first base station 100a and the second base station a, Equation 10> is used to determine the transmission power of the first repeater 300 and the second repeater 310. Thereafter, the determined transmission power may be transmitted to the first repeater 300 and the second repeater 310 to transmit a signal with the determined transmission power.

5 is a diagram illustrating a wireless communication system 10b according to another embodiment of the present invention.

As shown in FIG. 5, in the wireless communication system 10b according to the present embodiment, interference occurs in a cell that communicates between the terminal 130b and the base station 110b without the repeater 300b and the cell using the repeater 300b. The case is shown. That is, the first repeater 300b not only receives a signal to the first base station 100b but also receives an interference signal from the second base station 110b, and the second terminal 130b from the second base station 110b. In addition to receiving a signal, an interference signal is received from the first base station 100b. Here, although the wireless communication system 10b according to the present embodiment includes a plurality of base stations, the first repeater 300b receives the maximum interference signal from the second base station 110b and the second terminal 130b. Receives the maximum interference signal from the first base station (100b). Therefore, in order to control the transmission power in the manner described above, the first base station 100b receives the average channel gain of the interference signal from the first repeater 300b and the second base station 110b receives the second terminal 130b. Receive data on the average channel gain of the received signal and the like.

6 is a diagram illustrating a wireless communication system 10c according to another embodiment of the present invention.

As shown in FIG. 6, the wireless communication system 10c according to the present embodiment represents a case where interference occurs between a cell transmitting a signal in the repeater 300c and a cell transmitting a signal in the base station 110c. have. That is, the first terminal 120c not only receives a signal from the first repeater 300c but also receives an interference signal from the second base station 110c, and the second terminal 130c from the second base station 110c. In addition to receiving a signal, an interference signal is received from the first repeater 300c. Here, although the wireless communication system 10c according to the present embodiment includes a plurality of base stations and repeaters, the first terminal 120c is from the second base station 110c, and the second terminal 130c is the first repeater ( The maximum interference signal is received from 300c). Accordingly, the first repeater 300c receives data regarding the average channel gain of the interference signal and the average channel gain of the received signal, etc. from the first terminal 120c and the second base station 110c from the second terminal 130c. As described above, the transmission power is controlled.

7 is a flowchart illustrating the operation of the wireless communication system 10 according to an embodiment of the present invention.

The first base station 100 receives the channel gain information of the signal received from the first base station 100 from the first terminal 120 and the channel gain information of the interference signal received from the second base station 110 (700). . The first base station 100 calculates the transmission power based on the received channel gain information, and obtains the second transmission power information regarding the ratio of the calculated transmission power to the maximum transmission power of the first base station 100 ( 710). In this case, the transmission power is calculated by multiplying the square root of the channel gain of the interference signal with respect to the channel gain of the received signal by a constant.

In addition, the second base station 110 receives and transmits the channel gain information of the signal received from the second base station 110 and the channel gain information of the interference signal received from the first base station 100 from the second terminal 130. Calculate the power. The first base station 100 obtains first transmission power information about the ratio of the calculated transmission power to the maximum transmission power of the second base station 110 from the second base station 110 (720).

The first base station 100 controls the transmission power based on the first transmission power information and the second transmission power information. First, when the value of the second transmission power information is greater than the value of the first transmission power information (730) YES) the signal is transmitted at the maximum transmission power at the first base station 100 (740) and the constant used to calculate the transmission power at the first base station 100 is divided by the value of the second transmission power information. Change (750).

On the other hand, when the value of the second transmission power information is smaller than the value of the first transmission power information (NO of 730) by dividing the constant by the value of the first transmission power information, the received signal received from the first terminal 120 The transmission power is calculated by multiplying the square root of the channel gain of the interference signal by the channel gain of 760. In operation 770, the constant is changed to a value divided by the value of the first transmission power information. If the calculated transmission power is greater than the minimum transmission power of the first base station 100 (NO of 780), the signal is transmitted at the calculated transmission power (795). On the other hand, if the calculated transmission power is smaller than the minimum transmission power (YES of 780), the signal is transmitted at the minimum transmission power (790).

The scope of the present invention described so far is not limited to the described embodiments, but should be defined not only by the claims to be described below but also by the equivalents of the claims.

100: first base station 110: second base station
120: first terminal 130: second terminal
300: first repeater 310: second repeater

Claims (20)

In the power control method in a transmitter of a wireless communication system,
Obtaining first transmit power information about a ratio of a first transmit power of a first transmit signal transmitted from the neighbor transmitter to a first maximum transmit power of a neighbor transmitter;
Acquiring second transmission power information about a ratio of second transmission power of a second transmission signal transmitted from the transmitter to a second maximum transmission power of the transmitter;
And controlling transmission power of the second transmission signal based on the first transmission power information and the second transmission power information. The method of claim 1,
Acquiring the second transmission power information,
And calculating the second transmission power based on channel gain information of the first transmission signal and the second transmission signal. The method of claim 2,
And the channel gain information of the first transmission signal and the channel gain information of the second transmission signal are fed back from the receiver. The method of claim 2,
And the second transmission power is calculated by multiplying a square root of the channel gain of the first transmission signal to the channel gain of the second transmission signal by a constant. The method of claim 1,
Controlling the transmission power
And transmitting the second transmission signal at the second maximum transmission power when the value of the second transmission power information is greater than the value of the first transmission power information. The method of claim 4, wherein
Controlling the transmission power
And if the value of the second transmission power information is greater than the value of the first transmission power information, changing the constant to a value divided by the value of the second transmission power information. The method of claim 4, wherein
Controlling the transmission power
If the value of the second transmission power information is smaller than the value of the first transmission power information, the constant is divided by the value of the first transmission power information, and the first transmission signal for channel gain of the second transmission signal. And transmitting the second transmission signal at a transmission power calculated by multiplying a square root of a channel gain of the transmitter. The method of claim 7, wherein
The step of transmitting the second transmission signal
And transmitting the second transmission signal at the minimum transmission power when the calculated transmission power is smaller than the minimum transmission power of the transmitter. The method of claim 4, wherein
Controlling the transmission power
And if the value of the second transmission power information is smaller than the value of the first transmission power information, changing the constant to a value divided by the value of the first transmission power information. The method of claim 3,
And the receiver receives a signal from the transmitter and receives a maximum interference signal from the adjacent transmitter. In the transmitter of a wireless communication system,
A first communication unit communicating with an adjacent transmitter;
A second communication unit for communicating with a receiver;
First transmission power information regarding the ratio of the first transmission power of the first transmission signal transmitted from the neighboring transmitter to the first maximum transmission power of the neighboring transmitter and transmitted from the transmitter for the second maximum transmission power of the transmitter And a control unit for controlling the transmission power of the second transmission signal based on the second transmission power information regarding the ratio of the second transmission power of the second transmission signal. The method of claim 11,
And the control unit calculates the second transmission power based on channel gain information of the first transmission signal and the second transmission signal. The method of claim 12,
The channel gain information of the first transmission signal and the second transmission signal is characterized in that the feedback transmission from the receiver. The method of claim 12,
And the control unit calculates the second transmission power by multiplying a square root of the channel gain of the first transmission signal with respect to the channel gain of the second transmission signal. The method of claim 11,
And the control unit transmits the second transmission signal at the second maximum transmission power when the value of the second transmission power information is greater than the value of the first transmission power information. The method of claim 14,
And the control unit changes the constant to a value obtained by dividing the constant by the value of the second transmission power information when the value of the second transmission power information is greater than the value of the first transmission power information. The method of claim 14,
The control unit divides the constant by the value of the first transmission power information when the value of the second transmission power information is smaller than the value of the first transmission power information, and controls the second gain on the channel gain of the second transmission signal. And transmitting the second transmission signal with the transmission power calculated by multiplying the square root of the channel gain of the first transmission signal. The method of claim 17,
And the control unit transmits the second transmission signal at the minimum transmission power when the calculated transmission power is smaller than the minimum transmission power of the transmitter. The method of claim 14,
And the control unit changes the constant to a value obtained by dividing the constant by the value of the first transmission power information when the value of the second transmission power information is smaller than the value of the first transmission power information. The method of claim 13,
And the receiver receives a signal from the transmitter and a maximum interference signal from the adjacent transmitter.
KR1020110002889A 2011-01-11 2011-01-11 Transmitter in the wireless communication system and power control method thereof KR101115516B1 (en)

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KR20100086770A (en) * 2009-01-23 2010-08-02 서울대학교산학협력단 Method for controlling resource allocation considering inter-cell interference in multi-cell environments and system thereof
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KR20090000955A (en) * 2007-06-29 2009-01-08 삼성전자주식회사 Appratus and method for power contol in wireless communication terminal
KR20100065075A (en) * 2008-12-05 2010-06-15 한국전자통신연구원 Method for controlling power for inter-cell interference removal and apparatus thereof
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