WO2017018593A1 - Dispositif et procédé de détermination de la puissance de transmission dans un système de communication de dispositif à dispositif - Google Patents

Dispositif et procédé de détermination de la puissance de transmission dans un système de communication de dispositif à dispositif Download PDF

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Publication number
WO2017018593A1
WO2017018593A1 PCT/KR2015/009814 KR2015009814W WO2017018593A1 WO 2017018593 A1 WO2017018593 A1 WO 2017018593A1 KR 2015009814 W KR2015009814 W KR 2015009814W WO 2017018593 A1 WO2017018593 A1 WO 2017018593A1
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WIPO (PCT)
Prior art keywords
terminal
base station
channel
equation
channel state
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PCT/KR2015/009814
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English (en)
Korean (ko)
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이웅섭
반태원
정방철
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경상대학교산학협력단
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the following embodiments are related to an apparatus and method for determining transmission power in an inter-terminal communication system.
  • the present invention relates to a transmission power for maximizing data transmission speed between terminals while maintaining the influence of interference on a base station below a threshold.
  • the present invention relates to determining.
  • D2D communication is a distributed communication technology that directly passes traffic between adjacent nodes without using infrastructure such as base stations.
  • each node such as a mobile terminal, finds another terminal physically adjacent to itself, establishes a communication session, and transmits traffic. Since D2D communication can solve the traffic overload problem by distributing the traffic concentrated at the base station, it is getting the spotlight as an element technology of the next generation mobile communication technology after 4G.
  • the interference signal generated during the communication degrades the performance of the base station. That is, while the terminals perform the D2D communication, a technique for maintaining the performance of the base station is required.
  • An object of the following embodiments is to determine the transmission power for D2D communication between terminals without degrading the performance of the base station.
  • a terminal located within the coverage of a base station wherein the third terminal located within the coverage of the base station to the second terminal paired with the terminal during the time for transmitting the first data to the base station;
  • the apparatus may further include a channel state estimator and a receiver configured to estimate a second channel state from the second terminal to the terminal, wherein the transmitter transmits the second channel state to the base station and the receiver transmits the second channel state.
  • the transmission power determined in consideration of the state may be received from the base station.
  • the apparatus may further include a transmit power determiner configured to update and transmit the transmit power according to Equation 1 below.
  • Is the first channel state Is the effect of the multipath fading channel of the channel from the terminal to the base station, Is the channel gain according to the distance from the terminal to the base station.
  • Is a second channel state which is a channel state from the second terminal to the terminal, Is the influence of the multipath fading channel of the channel from the terminal to the second terminal, Is a channel gain according to the distance from the second terminal to the terminal.
  • Is the power of thermal noise Is the strength of the interference transmitted from the terminal to the base station, Is the maximum transmit power of the terminal. Is It is the larger of internal value and '0'.
  • Updated Is the value of, Is a threshold of the sum of interference signals received by the base station. Is the number of terminals transmitting interference to the base station, Is the value of the previous transmit power. Is any constant.
  • the apparatus may further include a transmit power determiner configured to determine the transmit power according to Equation 3 below.
  • I is a threshold of the sum of interference signals received by the base station.
  • Is the first channel state Is the effect of the multipath fading channel of the channel from the terminal to the base station, Is the channel gain according to the distance from the terminal to the base station.
  • Is a second channel state which is a channel state from the second terminal to the terminal, Is the effect of the multipath fading channel of the channel from the terminal to the second terminal, Is a channel gain according to the distance from the second terminal to the terminal.
  • Is the power of thermal noise Is the strength of the interference transmitted from the terminal to the base station, Is the maximum transmit power of the terminal. Is It is the larger of internal value and '0'.
  • I is a threshold of the sum of interference signals received by the base station.
  • a base station in which terminals located within coverage directly transmit data to each other, the pilot receiving unit receiving a pilot signal from a first terminal among the terminals, and using the received pilot signal;
  • a channel state estimator for estimating a first channel state from a first terminal to the base station, and a channel state receiver for receiving a second channel state from the first terminal to a second terminal included in the terminals from the first terminal
  • a transmission power determiner for determining a transmission power for the first terminal in consideration of the first channel state and the second channel state, and a transmitter for transmitting the determined transmission power to the first terminal.
  • the transmission power determiner may determine the transmission power according to Equation 7 and Equation 8 below.
  • I is a threshold of the sum of interference signals received by the base station.
  • Transmit power Is a set of terminals having a value of 0 Transmit power Has a value of Is a set of terminals.
  • Is the first channel state Is the effect of the multipath fading channel of the channel from the terminal to the base station, Is the channel gain according to the distance from the terminal to the base station.
  • Is a second channel state which is a channel state from the second terminal to the terminal, Is the influence of the multipath fading channel of the channel from the terminal to the second terminal, Is a channel gain according to the distance from the second terminal to the terminal.
  • Is the power of thermal noise Is the strength of the interference transmitted from the terminal to the base station, Is the maximum transmit power of the terminal. Is It is the larger of internal value and '0'.
  • the transmission power determiner may update the transmission power by repeating Equation 7 and Equation 8 until the determined transmission power satisfies Equation 9 below.
  • the third terminal located within the coverage of the base station is paired with the terminal during the time for transmitting the first data to the base station
  • a method of operating a terminal comprising directly transmitting second data to a second terminal at a transmission power determined in consideration of a first channel state from the terminal to the base station.
  • the method may further include receiving from a base station.
  • the method may further include updating and determining the transmission power according to Equation 10 below.
  • Is the value of the updated transmit power Is updated as in Equation 11 below.
  • Is the first channel state Is the effect of the multipath fading channel of the channel from the terminal to the base station, Is the channel gain according to the distance from the terminal to the base station.
  • Is a second channel state which is a channel state from the second terminal to the terminal, Is the influence of the multipath fading channel of the channel from the terminal to the second terminal, Is a channel gain according to the distance from the second terminal to the terminal.
  • Is the power of thermal noise Is the strength of the interference transmitted from the terminal to the base station, Is the maximum transmit power of the terminal. Is It is the larger of internal value and '0'.
  • Updated Is the value of, Is a threshold of the sum of interference signals received by the base station. Is the number of terminals transmitting interference to the base station, Is the value of the previous transmit power. Is any constant.
  • the method may further include determining the transmission power according to Equation 12 below.
  • I is a threshold of the sum of interference signals received by the base station.
  • the method may further include determining the transmission power according to Equation 14 below.
  • Is the first channel state Is the effect of the multipath fading channel of the channel from the terminal to the base station, Is the channel gain according to the distance from the terminal to the base station.
  • Is a second channel state which is a channel state from the second terminal to the terminal, Is the effect of the multipath fading channel of the channel from the terminal to the second terminal, Is a channel gain according to the distance from the second terminal to the terminal.
  • Is the power of thermal noise Is the strength of the interference transmitted from the terminal to the base station, Is the maximum transmit power of the terminal. Is It is the larger of internal value and '0'.
  • I is a threshold of the sum of interference signals received by the base station.
  • FIG. 1 is a diagram illustrating a concept of D2D communication according to an exemplary embodiment.
  • FIG. 2 is a flowchart illustrating a step-by-step method of D2D communication according to an exemplary embodiment.
  • FIG. 3 is a block diagram illustrating a structure of a terminal for performing D2D communication according to another exemplary embodiment.
  • Fig. 4 is a flowchart illustrating a step-by-step method of operating a terminal performing D2D communication according to another exemplary embodiment.
  • Fig. 5 is a block diagram showing the structure of a base station for determining transmission power for D2D communication according to another exemplary embodiment.
  • Fig. 6 is a flowchart illustrating step by step a D2D communication method according to yet another exemplary embodiment.
  • a terminal located within the coverage of a base station wherein the third terminal located within the coverage of the base station to the second terminal paired with the terminal during the time for transmitting the first data to the base station;
  • the apparatus may further include a channel state estimator and a receiver configured to estimate a second channel state from the second terminal to the terminal, wherein the transmitter transmits the second channel state to the base station and the receiver transmits the second channel state.
  • the transmission power determined in consideration of the state may be received from the base station.
  • the apparatus may further include a transmit power determiner configured to update and transmit the transmit power according to Equation 1 below.
  • Is the value of the updated transmit power Is updated as in Equation 2 below.
  • Is the first channel state Is the effect of the multipath fading channel of the channel from the terminal to the base station, Is the channel gain according to the distance from the terminal to the base station.
  • Is a second channel state which is a channel state from the second terminal to the terminal, Is the influence of the multipath fading channel of the channel from the terminal to the second terminal, Is a channel gain according to the distance from the second terminal to the terminal.
  • Is the power of thermal noise Is the strength of the interference transmitted from the terminal to the base station, Is the maximum transmit power of the terminal. Is It is the larger of internal value and '0'.
  • Updated Is the value of, Is a threshold of the sum of interference signals received by the base station. Is the number of terminals transmitting interference to the base station, Is the value of the previous transmit power. Is any constant.
  • the apparatus may further include a transmit power determiner configured to determine the transmit power according to Equation 3 below.
  • Is the first channel state Is the effect of the multipath fading channel of the channel from the terminal to the base station, Is the channel gain according to the distance from the terminal to the base station.
  • Is a second channel state which is a channel state from the second terminal to the terminal, Is the effect of the multipath fading channel of the channel from the terminal to the second terminal, Is a channel gain according to the distance from the second terminal to the terminal.
  • Is the power of thermal noise Is the strength of the interference transmitted from the terminal to the base station, Is the maximum transmit power of the terminal. Is It is the larger of internal value and '0'.
  • I is a threshold of the sum of interference signals received by the base station.
  • the transmission power may further include a transmission power determination unit to determine according to the following equation (5).
  • Is the first channel state Is the effect of the multipath fading channel of the channel from the terminal to the base station, Is the channel gain according to the distance from the terminal to the base station.
  • Is a second channel state which is a channel state from the second terminal to the terminal, Is the effect of the multipath fading channel of the channel from the terminal to the second terminal, Is a channel gain according to the distance from the second terminal to the terminal.
  • Is the power of thermal noise Is the strength of the interference transmitted from the terminal to the base station, Is the maximum transmit power of the terminal. Is It is the larger of internal value and '0'.
  • I is a threshold of the sum of interference signals received by the base station.
  • a base station in which terminals located within coverage directly transmit data to each other, the pilot receiving unit receiving a pilot signal from a first terminal among the terminals, and using the received pilot signal;
  • a channel state estimator for estimating a first channel state from a first terminal to the base station, and a channel state receiver for receiving a second channel state from the first terminal to a second terminal included in the terminals from the first terminal
  • a transmission power determiner for determining a transmission power for the first terminal in consideration of the first channel state and the second channel state, and a transmitter for transmitting the determined transmission power to the first terminal.
  • the transmission power determiner may determine the transmission power according to Equation 7 and Equation 8 below.
  • I is a threshold of the sum of interference signals received by the base station.
  • Transmit power Is a set of terminals having a value of 0 Transmit power Has a value of Is a set of terminals.
  • Is the first channel state Is the effect of the multipath fading channel of the channel from the terminal to the base station, Is the channel gain according to the distance from the terminal to the base station.
  • Is a second channel state which is a channel state from the second terminal to the terminal, Is the influence of the multipath fading channel of the channel from the terminal to the second terminal, Is a channel gain according to the distance from the second terminal to the terminal.
  • Is the power of thermal noise Is the strength of the interference transmitted from the terminal to the base station, Is the maximum transmit power of the terminal. Is It is the larger of internal value and '0'.
  • the transmission power determiner may update the transmission power by repeating Equation 7 and Equation 8 until the determined transmission power satisfies Equation 9 below.
  • the third terminal located within the coverage of the base station is paired with the terminal during the time for transmitting the first data to the base station
  • a method of operating a terminal comprising directly transmitting second data to a second terminal at a transmission power determined in consideration of a first channel state from the terminal to the base station.
  • the method may further include receiving from a base station.
  • the method may further include updating and determining the transmission power according to Equation 10 below.
  • Is the value of the updated transmit power Is updated as in Equation 11 below.
  • Is the first channel state Is the effect of the multipath fading channel of the channel from the terminal to the base station, Is the channel gain according to the distance from the terminal to the base station.
  • Is a second channel state which is a channel state from the second terminal to the terminal, Is the influence of the multipath fading channel of the channel from the terminal to the second terminal, Is a channel gain according to the distance from the second terminal to the terminal.
  • Is the power of thermal noise Is the strength of the interference transmitted from the terminal to the base station, Is the maximum transmit power of the terminal. Is It is the larger of internal value and '0'.
  • Updated Is the value of, Is a threshold of the sum of interference signals received by the base station. Is the number of terminals transmitting interference to the base station, Is the value of the previous transmit power. Is any constant.
  • the method may further include determining the transmission power according to Equation 12 below.
  • I is a threshold of the sum of interference signals received by the base station.
  • the method may further include determining the transmission power according to Equation 14 below.
  • Is the first channel state Is the effect of the multipath fading channel of the channel from the terminal to the base station, Is the channel gain according to the distance from the terminal to the base station.
  • Is a second channel state which is a channel state from the second terminal to the terminal, Is the effect of the multipath fading channel of the channel from the terminal to the second terminal, Is a channel gain according to the distance from the second terminal to the terminal.
  • Is the power of thermal noise Is the strength of the interference transmitted from the terminal to the base station, Is the maximum transmit power of the terminal. Is It is the larger of internal value and '0'.
  • I is a threshold of the sum of interference signals received by the base station.
  • FIG. 1 is a diagram illustrating a concept of D2D communication according to an exemplary embodiment.
  • Each of the terminals 121, 122, 131, 132, 140 may transmit data according to a device-to-device (D2D) communication method of directly transmitting data to other terminals, or via the base station 110 to another terminal. You can also send data.
  • D2D device-to-device
  • Terminals using the D2D communication scheme form a pair (pair, 120, 130) with other terminals for transmitting and receiving data.
  • the terminal 121 configures a first D2D pair 120 with the terminal 122, and the terminal 121 directly transmits data to the terminal 122 according to a D2D communication scheme.
  • the terminal 131 forms a second D2D pair 130 with the terminal 132, and the terminal 131 directly transmits data to the terminal 132 according to a D2D communication scheme.
  • the terminal 140 transmits data to the other terminal through the base station 110.
  • a terminal for transmitting data using a D2D communication method is referred to as a D2D transmitting terminal and a terminal for receiving data using a D2D communication method is referred to as a D2D receiving terminal.
  • each pair 120, 130 is Assume that they are spaced apart by the above distance. Also, in each D2D pair 120, 130, the D2D transmitting terminals 121, 131 are connected to the D2D receiving terminals 122, 132 in another D2D pair. Assume that we transmit as much interference.
  • the D2D transmitting terminal (121, 131) transmits data to the D2D receiving terminal (122, 132) at the same time as the terminal 140 for transmitting data to the base station. Therefore, the D2D transmission terminals 121 and 131 transmit the interference signal to the base station 140, and as a result, the data reception performance of the base station 140 is degraded.
  • the base station 140 may determine the transmission power of the D2D transmitting terminals to maximize the data rate of each D2D pair while maintaining the strength of the interference signal received from all the D2D transmitting terminals to a certain level or less.
  • a channel gain according to a distance from a D2D transmitting terminal (called an i-th D2D transmitting terminal) included in an i-th D2D pair to a base station 140 is calculated.
  • the effects of multipath fading channels The channel state from the i-th D2D transmitting terminal to the base station 140 can be expressed as
  • the channel gain according to the distance from the ith D2D transmitting terminal to the ith D2D receiving terminal The effects of multipath fading channels , The channel state from the i th D2D transmitting terminal to the i th D2D receiving terminal Can be expressed.
  • the channel gain according to the distance from the ith D2D transmitting terminal to the ith D2D receiving terminal The effects of multipath fading channels , The channel state from the i th D2D transmitting terminal to the i th D2D receiving terminal Can be expressed.
  • Equation 1 the sum of normalized data rates of each D2D pair may be expressed by Equation 1 below.
  • the threshold value of the strength of the interference signal received by the D2D base station 140 In this case, the base station 140 receives a certain level (the strength of the interference signal received from all the D2D transmitting terminals). Keeping below) can be expressed as Equation 2 below.
  • each D2D transmission terminal Has a limiting condition as shown in Equation 3 below. here, Transmit power Is the maximum value that can have.
  • the base station 140 determines the transmission power of the D2D transmission terminals so that the data rate of each D2D pair is maximized while maintaining the strength of the interference signal received from all the D2D transmission terminals below a certain level. Satisfying Equations 2 and 3 To maximize Equation 1 It can be modeled as yielding a combination of these. To satisfy these conditions A specific method for calculating the combination of these will be described in detail with reference to FIGS. 2 to 7.
  • the transmission power determination method according to an exemplary embodiment can be largely divided into four embodiments according to a subject that determines the transmission power and a parameter that is considered for determining the transmission power.
  • FIG. 2 is a flowchart illustrating a step-by-step method of D2D communication according to an exemplary embodiment.
  • the base station 110 considers a channel state from the D2D transmitting terminals 121 and 131 to the base station 110 and a channel state from the D2D transmitting terminals 121 and 131 to the D2D receiving terminals 122 and 132.
  • An embodiment of determining the transmission power of the D2D transmission terminals 121 and 131 is shown.
  • step 230 the D2D transmitting terminal 210 transmits a pilot signal to the base station 220.
  • the base station estimates a first channel state from the D2D transmitting terminal 210 to the base station 220 using the pilot signal received from the D2D transmitting terminal 210.
  • the first channel state is a channel gain according to the distance from the D2D transmitting terminal 210 to the base station 220
  • multipath fading channel effects Considering It can be expressed as
  • the D2D transmitting terminal 210 estimates a second channel state from the D2D transmitting terminal 210 to the D2D receiving terminal (not shown).
  • the second channel state is a channel gain according to the distance from the D2D transmitting terminal 210 to the D2D receiving terminal
  • multipath fading channel effects Considering It can be expressed as
  • step 241 the D2D transmitting terminal 210 transmits the second channel state to the base station 220.
  • the base station 220 determines the transmit power of the D2D transmitting terminal 210 in consideration of the first channel state and the second channel state. According to one side, the base station maintains the transmission power of the D2D transmission terminals to the maximum data rate of each D2D pair while maintaining the strength of the interference signal received from all the D2D transmission terminals for a K terminal pair below a certain level. You can decide.
  • Equation 1 This satisfies Equations 2 and 3 To maximize Equation 1 It can be thought of as yielding a combination of these.
  • the base station 220 using the following equation (4) and (5), according to the following algorithm Can be calculated.
  • base station 220 is To the empty set ( Can be initialized to here, Transmit power Is a set of D2D transmitting terminals with a value of 0.)
  • base station 220 is To the empty set ( Can be initialized to here, Transmit power Has a value of Is a set of D2D transmission terminals.)
  • K is a set of D2D transmission terminals.
  • Step 5 Determine whether the following inequality (Equation 6) is satisfied
  • step 5 If the inequality is satisfied in step 5, the determined The value is finally determined as the transmission power of the D2D transmitting terminal. If the inequality is not satisfied, the following steps 6 and 9 are repeated until the inequality is satisfied.
  • Step 8 According to Equation 4 Calculation
  • step 260 the base station 220 calculates the calculated transmit power To the D2D transmitting terminal 210.
  • step 261 the D2D transmitting terminal 210 receives the received transmit power.
  • the second data is transmitted to the D2D receiving terminal (second terminal, not shown).
  • the interference signal is transmitted to the base station 220, but the total sum of the interference signals received by the base station 220 is kept below the threshold. Therefore, even when the base station 220 receives the first data at the same time as the D2D transmitting terminal 210, the performance of the base station 220 is maintained.
  • the terminal according to the exemplary embodiment includes a channel state estimator 310, a transmitter 320, and a receiver 330.
  • the terminal 300 and the second terminal 350 are terminals included in the same terminal pair, the terminal 300 operates as a D2D transmitting terminal, and the second terminal 350 operates as a D2D receiving terminal.
  • the transmitter 320 transmits a pilot signal to the base station 340.
  • the pilot signal transmitted to the base station 340 is used to estimate the first channel state from the terminal 300 to the base station 340.
  • the channel state estimator 310 estimates a second channel state from the second terminal 350 to the terminal 300.
  • the receiver 330 receives a pilot signal from the second terminal 350, the channel state estimator 310 using the pilot signal received from the second terminal 350, the second terminal 350
  • the second channel state from the terminal to the terminal 300 can be estimated.
  • the transmitter 320 transmits the second channel state to the base station 340.
  • the second channel state may be used by the base station 340 to determine the transmit power of the terminal 300.
  • the base station 340 may determine the transmission power of the terminal 300 in consideration of both the first channel state and the second channel state.
  • the base station 340 maintains the strength of the interference signal received from all the D2D transmitting terminals for the K terminal pairs below a certain level, so that the data rate of each D2D pair to the maximum D2D transmitting terminal Can determine their transmit power.
  • the base station 340 may determine the transmit power of the terminal 300 by using the algorithm according to the steps 1 to 9 described above.
  • the receiver 330 receives the transmission power determined by the base station 340 from the base station 340.
  • a third terminal may be additionally located within the coverage of the base station 340.
  • the third terminal may transmit the first data to the base station without directly transmitting the data to another terminal.
  • the transmitter 320 transmits the second data to the second terminal 350 while the third terminal transmits the first data to the base station 340.
  • the transmitter 320 may transmit the second data with the received transmission power.
  • the interference signal is transmitted from the terminal 300 to the base station 340.
  • the total sum of the interference signals received by the base station 340 is maintained below the threshold.
  • Fig. 4 is a flowchart illustrating a step-by-step method of operating a terminal performing D2D communication according to another exemplary embodiment.
  • step 410 the terminal transmits a pilot signal to the base station.
  • the pilot signal transmitted to the base station is used to estimate the first channel state from the terminal to the base station.
  • the terminal estimates a second channel state from the second terminal to the terminal.
  • the second terminal is a terminal included in the same terminal pair as the terminal.
  • the terminal operates as a D2D transmitting terminal and the second terminal operates as a D2D receiving terminal.
  • the terminal transmits a second channel state to the base station.
  • the second channel state may be used by the base station to determine the transmit power of the terminal.
  • the base station maintains the transmission power of the D2D transmission terminals to the maximum data rate of each D2D pair while maintaining the strength of the interference signal received from all the D2D transmission terminals for a K terminal pair below a certain level. You can decide.
  • the base station may determine the transmit power of the terminal using the algorithm according to the steps 1 to 9 described above.
  • step 440 the terminal receives the transmission power determined by the base station from the base station.
  • the terminal transmits the second data to the second terminal during the time that the third terminal transmits the first data to the base station.
  • the third terminal is a terminal located within the coverage of the base station and is a terminal for directly transmitting data to the base station.
  • the terminal may transmit the second data at the received transmission power.
  • the interference signal is transmitted from the terminal to the base station.
  • the total sum of the interference signals received by the base station remains below the threshold.
  • Fig. 5 is a block diagram showing the structure of a base station for determining transmission power for D2D communication according to another exemplary embodiment.
  • Another base station 500 includes a pilot receiver 510, a channel state estimator 520, a channel state receiver 530, a transmit power determiner 540, and a transmitter 550.
  • the pilot receiver 510 receives a pilot signal from the terminal 560.
  • the channel state estimator 520 estimates a first channel state from the terminal 560 to the base station using the received pilot signal.
  • the channel state receiver 530 receives the second channel state from the terminal 560.
  • the second channel state is a channel state from the second terminal 570 to the terminal 560.
  • the terminal 560 may receive a second pilot signal from the second terminal 570 and estimate the second channel state using the received second pilot signal.
  • the transmit power determiner 540 determines the transmit power of the terminal 560 using the second channel state and the first channel state. According to one side, the transmission power determiner 540 maintains the strength of the interference signal received from all the D2D transmission terminals for the K terminal pairs below a certain level, D2D so that the data rate of each D2D pair to the maximum It is possible to determine the transmit power of the transmitting terminals. According to another aspect, the transmit power determiner 540 may determine the transmit power of the terminal 560 by using the algorithm according to the steps 1 to 9 described above.
  • the transmitter 550 transmits the determined transmission power to the terminal 560.
  • the terminal 560 receives the transmission power from the base station 500.
  • the third terminal may be located in the coverage of the base station 500.
  • the third terminal may transmit data to the base station 500 without directly transmitting data to another terminal.
  • the terminal 560 transmits the second data to the second terminal 570 during the time when the third terminal transmits the first data to the base station 500.
  • the terminal 560 may transmit the second data with the received transmission power.
  • the interference signal is transmitted from the terminal 560 to the base station 500.
  • the total sum of the interference signals received by the base station 500 remains below the threshold.
  • Fig. 6 is a flowchart illustrating step by step a D2D communication method according to yet another exemplary embodiment.
  • step 630 the terminal 610 transmits a pilot signal to the base station 620.
  • the base station estimates a first channel state from the terminal 610 to the base station 620 using the received pilot signal.
  • step 640 the terminal 610 receives the first channel state from the base station 620.
  • the terminal 610 receives the first channel state estimated by the base station 620 is described. According to another embodiment, the terminal 610 is downward from the base station 620 to the terminal 610.
  • the link channel state may be used as the first channel state.
  • the terminal 610 estimates a second channel state from the second terminal to the terminal 610.
  • the terminal 610 may receive a second pilot signal from the second terminal, and estimate the second channel state from the second terminal to the terminal 610 using the received second pilot signal.
  • step 660 the terminal 610 determines the transmit power.
  • the terminal 610 determines the transmission power according to some assumptions of a distributed power control scheme, a power control scheme based on average, and a power average based on a channel average value. It can be classified into a technique (Power Control Scheme Based on Averaged Channel Value).
  • the terminal 610 may determine the transmit power. Accordingly, the terminal 610 does not need to feed back the second channel state to the base station 620.
  • the terminal 610 is a utility for the i-th D2D pair according to Equation 7 below. Can be defined.
  • the first item is the data rate between the i-th D2D pair
  • the second item is the influence of interference transmitted by the D2D transmitting terminal 610 included in the i-th D2D pair to the base station.
  • Equation 7 a utility Is proportional to the data rate between the D2D pairs and is inversely proportional to the effect of interference transmitted by the D2D transmitting terminal 620 to the base station 620.
  • the normalization cost of interference If appropriately determined, it is possible to control the effect of the interference on the base station 620 due to the D2D transmission.
  • the terminal 610 is a utility Transmit power to maximize Can be determined.
  • utility Using the derivative of, the transmit power May be updated as in Equation 8 below.
  • I a value determined by the base station 620 at time t, and may be determined as shown in Equation 9 below.
  • step 660 the terminal is defined in Equation 9 from the base station And transmit power in accordance with Equation (8). Can be updated.
  • the base station 620 may not know the second channel state between the terminal 610 and the second terminal. Can be updated. Accordingly, the terminal 610 does not have to feed back the second channel state every time, and can greatly reduce the signaling overhead.
  • the transmission power may be determined according to average channel information, rather than instantaneous channel information.
  • the average data rate between the D2D pairs is maximized, and the average value of the interference transmitted to the base station is controlled below the threshold.
  • the average power control technique may be expressed as Equation 10 below.
  • Is Is a vector whose elements are Is Vector whose elements are elements. Is the normalization cost of the interference taking the average value into account.
  • the terminal 610 is optimal to satisfy the equation (10) sign
  • the value of can be calculated according to the following equation (11).
  • Equation 12 the condition Can be expressed as in Equation 13.
  • Equation 15 the first item of Equation 12 may be expressed as Equation 15 below.
  • Equation 16 Equation 16
  • the terminal 610 is optimal May be calculated using Equations 11, 15, and 16.
  • the terminal 610 is An approximation of can be calculated according to the following equation (17).
  • the terminal 610 is a threshold value of the sum of the number K of D2D pairs and the interference signal received by the base station. Using bay You can simply determine the approximation of.
  • the terminal 610 may be affected by multipath fading. , Can be assumed to be 1. In this case, the cost of interference May be determined according to Equation 18 below.
  • Equation 19 The optimal solution of equation (18) can be summarized as a value satisfying Equation 19 below.
  • the terminal 610 is An approximation of can be calculated according to the following equation (20).
  • the terminal 610 is a threshold value of the sum of the number K of D2D pairs and the interference signal received by the base station. Using bay You can simply determine the approximation of.
  • the terminal 610 may transmit second data to the second terminal at the determined transmission power. According to one side, the terminal 610 may transmit the second data during the time that the third terminal located in the coverage of the base station 620 transmits the first data to the base station 620. In this case, the interference signal is transmitted from the terminal 610 to the base station 620. However, the total sum of the interference signals received by the base station 620 remains below the threshold.
  • the terminal 700 is a block diagram illustrating a structure of a terminal for performing D2D communication according to another exemplary embodiment.
  • the terminal 700 according to an exemplary embodiment includes a transmission power determiner 710 and a transmitter 720.
  • the transmit power determiner 710 determines the transmit power of the terminal 700.
  • the transmission power determination unit 710 is a distributed power control scheme (Distributed Power Control Scheme) described above, a power control scheme based on the average (Power Control Scheme Based on Expectation) and a channel average value based on the power control scheme (The transmission power may be determined according to any one of Power Control Scheme Based on Averaged Channel Value.
  • distributed Power Control Scheme distributed Power Control Scheme
  • the transmission power may be determined according to any one of Power Control Scheme Based on Averaged Channel Value.
  • the transmit power determiner 710 may determine transmit power according to a distributed power control technique.
  • the terminal 700 costs the normalization cost of the interference from the base station (not shown).
  • Receive the received The transmission power may be determined by substituting Equation (8).
  • the transmission power determiner 710 may determine the transmission power according to the average power control technique.
  • the transmission power determiner 710 may use the equations 11, 15, and 16 to optimize And calculate The transmission power may be determined by substituting into Equation 10.
  • the transmit power determiner 710 may determine the transmit power according to a power control scheme based on the channel average value. In this case, the transmission power determining unit 710 according to the equation (19) interference cost And calculate By substituting into Equation 18, the transmission power may be determined.
  • the transmitter 720 transmits the second data to the second terminal 630 according to the determined transmission power. According to one side, the transmitter 720 may transmit the second data during the time that the third terminal located in the coverage of the base station transmits the first data to the base station. In this case, the interference signal is transmitted from the transmitter 720 to the base station. However, the total sum of the interference signals received by the base station remains below the threshold.
  • FIG. 8 is a flowchart illustrating a method of operating a terminal for performing D2D communication according to another exemplary embodiment.
  • the terminal determines the transmit power.
  • the terminal is a distributed power control scheme (Distributed Power Control Scheme) described above, a Power Control Scheme Based on Expectation and a power control scheme based on the channel average value (Power Control Scheme Based on Averaged) Channel Value) can be used to determine the transmit power according to any one of the techniques.
  • the terminal may determine the transmit power according to a distributed power control technique.
  • the terminal costs the normalization cost of the interference from the base station (not shown).
  • Receive the received The transmission power may be determined by substituting Equation (8).
  • the terminal may determine the transmission power according to the average power control scheme.
  • the terminal uses the equations 11, 15, and 16 to optimize And calculate The transmission power may be determined by substituting into Equation 10.
  • the terminal uses Equation 17 You can simply determine the approximation of.
  • the terminal may determine the transmit power according to a power control scheme based on the channel average value.
  • the terminal costs the interference according to equation (19). And calculate By substituting into Equation 18, the transmission power may be determined.
  • the terminal uses Equation 20 You can simply determine the approximation of.
  • the terminal transmits the second data to the second terminal according to the determined transmission power.
  • the terminal may transmit the second data during the time that the third terminal located in the coverage of the base station transmits the first data to the base station.
  • the interference signal is transmitted from the terminal to the base station.
  • the total sum of the interference signals received by the base station remains below the threshold.
  • the method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium.
  • the computer readable medium may include program instructions, data files, data structures, etc. alone or in combination.
  • the program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts.
  • Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks.
  • Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.
  • the hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.
  • D2D device-to-device
  • the total sum of the interference signals transmitted from the terminal to the base station can be controlled to a threshold or less while maximally improving the data rate of the terminal-to-terminal communication.

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

Abstract

L'invention concerne un procédé de détermination de la puissance de transmission dans un système de communication de dispositif à dispositif (D2D). Selon le procédé de détermination de la puissance de transmission selon l'invention, la somme totale des signaux brouilleurs transmis d'un terminal à une station de base peut être contrôlée de sorte à être égale voire inférieure à une valeur de seuil tout en optimisant un débit de transmission de données de la communication D2D.
PCT/KR2015/009814 2015-07-27 2015-09-18 Dispositif et procédé de détermination de la puissance de transmission dans un système de communication de dispositif à dispositif WO2017018593A1 (fr)

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KR1020150105695A KR101662505B1 (ko) 2015-07-27 2015-07-27 단말간 통신 시스템에서 전송 전력을 결정하는 장치 및 방법
KR10-2015-0105695 2015-07-27

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KR102568492B1 (ko) * 2022-03-17 2023-08-18 경상국립대학교산학협력단 이진 피드백을 이용한 인공 신경망 기반의 통신 시스템
KR102568491B1 (ko) * 2022-03-22 2023-08-18 경상국립대학교산학협력단 부분 피드백을 이용한 인공 신경망 기반의 통신 시스템

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WO2012091420A2 (fr) * 2010-12-27 2012-07-05 한국전자통신연구원 Procédé pour établir une connexion via une liaison de dispositif à dispositif, pour programmer une communication de dispositif à dispositif et pour relayer un terminal
WO2013137580A1 (fr) * 2012-03-12 2013-09-19 엘지전자 주식회사 Procédé d'émission et de réception d'informations de contrôle et appareil associé
WO2013141592A1 (fr) * 2012-03-22 2013-09-26 엘지전자 주식회사 Procédé et dispositif de transmission d'informations de canal
WO2013191518A1 (fr) * 2012-06-22 2013-12-27 엘지전자 주식회사 Procédé de planification d'une communication de dispositif à dispositif et appareil correspondant
WO2015053514A1 (fr) * 2013-10-08 2015-04-16 삼성전자 주식회사 Procédé et appareil de multiplexage de commande de puissance de signal d'émission et de ressource de signal de découverte dans un système de communication sans fil

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WO2012091420A2 (fr) * 2010-12-27 2012-07-05 한국전자통신연구원 Procédé pour établir une connexion via une liaison de dispositif à dispositif, pour programmer une communication de dispositif à dispositif et pour relayer un terminal
WO2013137580A1 (fr) * 2012-03-12 2013-09-19 엘지전자 주식회사 Procédé d'émission et de réception d'informations de contrôle et appareil associé
WO2013141592A1 (fr) * 2012-03-22 2013-09-26 엘지전자 주식회사 Procédé et dispositif de transmission d'informations de canal
WO2013191518A1 (fr) * 2012-06-22 2013-12-27 엘지전자 주식회사 Procédé de planification d'une communication de dispositif à dispositif et appareil correspondant
WO2015053514A1 (fr) * 2013-10-08 2015-04-16 삼성전자 주식회사 Procédé et appareil de multiplexage de commande de puissance de signal d'émission et de ressource de signal de découverte dans un système de communication sans fil

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023246504A1 (fr) * 2022-06-21 2023-12-28 中移(成都)信息通信科技有限公司 Procédé et appareil de traitement, dispositif, et support de stockage

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