WO2011007576A1 - コグニティブ無線通信における電力制御方法,コグニティブ無線通信システム,及び無線通信デバイス - Google Patents
コグニティブ無線通信における電力制御方法,コグニティブ無線通信システム,及び無線通信デバイス Download PDFInfo
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- WO2011007576A1 WO2011007576A1 PCT/JP2010/004613 JP2010004613W WO2011007576A1 WO 2011007576 A1 WO2011007576 A1 WO 2011007576A1 JP 2010004613 W JP2010004613 W JP 2010004613W WO 2011007576 A1 WO2011007576 A1 WO 2011007576A1
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- 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
- 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
- H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
-
- 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
- H04W52/06—TPC algorithms
- H04W52/08—Closed loop power control
-
- 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
- H04W52/06—TPC algorithms
- H04W52/12—Outer and inner loops
-
- 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
Definitions
- the present invention relates to a power control method in cognitive radio communication, a cognitive radio communication system, a radio communication device, and the like.
- DSA Dynamic spectrum access technology
- CRS cognitive radio system
- SU unlicensed secondary user
- PU primary user
- spectrum sensing is performed in order to realize dynamic spectrum access technology (DSA).
- DSA dynamic spectrum access technology
- the spectrum usage is analyzed based on sensing information obtained as a result of spectrum sensing, and an accessible spectrum (white space) is determined.
- the secondary user can communicate using the white space.
- the secondary user (SU) cannot detect the pilot signal of the primary user (PU) and starts communication in the same frequency band as the spectrum used by the primary user (PU). If this happens, interference will occur. Furthermore, interference also occurs when the secondary user (SU) communicates with power higher than a predetermined limit value.
- Non-Patent Document 1 In order to protect the primary user (PU) from being interfered with, it has been proposed to limit interference to the secondary user (SU) (for example, see Non-Patent Document 1). In the technique described in Non-Patent Document 1, beam forming is performed to suppress interference.
- the secondary user (SU) in order to perform beam forming, the secondary user (SU) must acquire instantaneous channel information regarding the channel from the secondary user (SU) wireless transmitter to the primary user (PU) wireless receiver. Don't be.
- the process for acquiring necessary information is complicated, and as a result, the indirect cost (overhead) of the wireless communication system increases.
- an object of the present invention is to provide a power control method, a cognitive radio communication system, and the like that can efficiently perform power control without excessive indirect costs (overhead) in cognitive radio communication.
- Another object of the present invention is to provide a wireless communication device for cognitive wireless communication.
- the present invention relates to a power control method for controlling communication power used for cognitive radio communication.
- this power control method an estimation step of estimating a target value of SNR based on control information related to interference and an adjustment step of adjusting communication power based on the target value of SNR estimated in the estimation step are executed.
- power control can be performed efficiently without incurring excessive indirect costs.
- One piece of control information related to interference is the interference power level ⁇ , which indicates the interference power level at the radio receiver of the primary user (PU).
- Another control information related to interference is the maximum probability ⁇ , which indicates the maximum probability when the interference value in the primary user (PU) exceeds the interference power level ⁇ .
- a radio communication system that performs the cognitive radio communication includes a base station for cognitive radio communication, a first radio communication device capable of radio communication, and a second radio capable of radio communication.
- Communication device includes a wireless receiver
- the second wireless communication device includes a wireless transmitter.
- the base station further executes a step of transmitting the control information related to the interference to the radio receiver of the first radio communication device.
- the wireless receiver of the first wireless communication device estimates the SNR target value based on the control information, and sends a command including the SNR target value to the second wireless communication device. Notify the wireless transmitter.
- the wireless transmitter of the second wireless communication device adjusts transmission power for transmitting a wireless signal to the second wireless communication device based on the target value of SNR.
- the first wireless communication device can perform cognitive wireless communication with the second wireless communication device using the transmission power.
- the SNR corresponds to one constant output value that can be selected from a plurality of constant output values.
- the maximum value of the constant output values that do not exceed the target value of SNR among the plurality of constant output values is selected, and the output value is set as the maximum value as communication power adjustment.
- the cognitive radio communication system includes a first radio communication device that estimates a target value of SNR based on control information related to interference, and a second radio communication device that adjusts communication power based on the target value of SNR. It is out. Thereby, it becomes possible to perform cognitive radio communication with adjusted communication power between the first radio communication device and the second radio communication device. Therefore, an effect equivalent to the effect described above can be achieved.
- this wireless communication device includes means for adjusting communication power used for cognitive wireless communication based on a target value of SNR estimated by other wireless communication devices based on control information regarding interference. This makes it possible to perform cognitive wireless communication with other wireless communication devices with adjusted communication power. Therefore, also in this case, an effect equivalent to the effect described above can be achieved.
- FIG. 1 is a diagram schematically showing the configuration of a cognitive radio communication system in which the power control method of the present invention is implemented.
- FIG. 2 is a block diagram schematically showing a configuration of a second wireless communication device functioning as a secondary user (SU) in the wireless communication system of FIG.
- FIG. 3 is a diagram for explaining cognitive radio communication executed in the cognitive radio communication system of FIG.
- FIG. 4 is a flowchart showing a processing procedure of a power control method implemented in the cognitive radio communication system shown in FIG.
- FIG. 5 is a diagram for explaining a plot of detection probabilities.
- FIG. 6 is a diagram for explaining a plot of the cumulative distribution function (CDF) when the number of antennas of the secondary user (SU) is changed.
- CDF cumulative distribution function
- FIG. 7 is a diagram for explaining a plot of probability P r ⁇ I n > ⁇
- FIG. 8 is a diagram for explaining the BER (bit error rate) performance of communication between secondary users (SU).
- FIG. 9 is a flowchart illustrating a processing procedure of the fixed power control method according to the first comparative example.
- FIG. 1 is a diagram schematically showing a configuration of a cognitive radio communication system in which the power control method of the present invention is implemented.
- a cognitive radio communication system 100 shown in FIG. 1 includes one first base station 1, one second base station 5, a plurality of first radio communication devices 10, and a plurality of second radio communication devices. 20. Note that the number of base stations 1 and 5 included in the cognitive radio communication system 100 may be plural. Further, the number of wireless communication devices 10 and 20 included in the cognitive wireless communication system 100 may be two or more.
- the first base station 1 is for controlling the first wireless communication device 10 and the second wireless communication device 20, and specifically, the first base station 1 uses the instruction information necessary for wireless communication as a wireless signal,
- the data is transmitted to the first wireless communication device 10 and the second wireless communication device 20.
- the first base station 1 includes a data archive (DA) and generates instruction information based on information stored in the data archive (DA).
- the area where the wireless signal including the instruction information can reach corresponds to an area (coverage) where the first wireless communication device 10 and the second wireless communication device 20 can receive the wireless signal.
- This area is an area (or space) in which the first wireless communication device 10 and the second wireless communication device 20 can perform wireless communication in cognitive wireless communication. Therefore, a wireless communication device in this area can be a primary user (PU) in cognitive wireless communication. Therefore, in this specification, this area is also referred to as a PU area.
- the second base station 5 is arranged in the PU area of the first base station, relays instruction information from the first base station 1, and replaces the first base station 1 as necessary. To send instruction information. Therefore, the second base station 5 is also for controlling the first wireless communication device 10 and the second wireless communication device 20.
- the second base station 5 includes a data archive (DA), and generates instruction information based on information stored in the data archive (DA). Also, the second base station 5 transmits instruction information necessary for cognitive radio communication.
- the area where the radio signal including the instruction information can reach corresponds to an area (coverage) where the first radio communication device 10 and the second radio communication device 20 can receive the radio signal. This area is generally smaller than the PU area.
- the first wireless communication device 10 and the second wireless communication device 20 are both devices capable of wireless communication.
- the wireless communication devices 10 and 20 may be portable devices (for example, mobile phones or notebook personal computers), or may be stationary devices.
- the first wireless communication device 10 corresponds to a wireless communication device that functions only as a primary user (PU) in the cognitive wireless communication system 100
- the second wireless communication device 20 is a cognitive wireless communication system. It is assumed that 100 corresponds to a wireless communication device that can also function as a secondary user (SU).
- PU primary user
- SU secondary user
- FIG. 2 is a block diagram schematically showing the configuration of the second wireless communication device 20 that functions as a secondary user (SU) in the wireless communication system 100 of FIG.
- SU secondary user
- the three types of channels 30, 40, and 50 shown in FIG. 3 perform wireless communication using the same frequency region.
- independent block fading is applied to these three types of channels 30, 40, and 50.
- the fading state of the channel is fixed during the communication period of one data frame, but varies when it extends over a plurality of data frames.
- step S1 first, before the first secondary user (SU1) starts cognitive radio communication with the second secondary user (SU2), the processes of steps S1 to S8 are performed.
- step S1 first, the wireless transceiver of the first secondary user (SU1) is initialized.
- the wireless transmitter of the first secondary user (SU1) receives the policy regulation information using the control channel specified in step S2.
- the policy regulation information includes information indicating the interference limit value of the primary user (PU).
- Such policy regulation information is acquired from the data archive (DA) included in the base stations 1 and 5 in the cognitive radio communication system 100.
- the wireless transmitter of the first secondary user (SU1) may obtain directly from the data archive (DA). .
- X i (k) in the above equation (8) indicates the k-th sample in the signal x i .
- N 0 is the total number of samples.
- the wireless transmitter of the first secondary user specified the control channel by performing the first spectrum sensing (step S2 ').
- the first secondary user has received the interference limit value of the primary user (PU) (step S3 ').
- the interference limit value is specified by the two parameters ( ⁇ , ⁇ ) as described above.
- the first secondary user (SU1) is an equation related to instantaneous INR distribution in the interference channel, and is expressed as a function of constant transmission power. Formula is required.
- the secondary user (SU) may interfere with the primary user (PU) in the case of false detection (MD) as described above. It was.
- the first secondary user (SU1) fails to detect the presence of the primary user (PU) signal (eg, pilot signal), and the first When the secondary user (SU1) has a large transmission power and, as a result, exceeds the interference power level ⁇ as a predetermined threshold included in the interference limit value, the secondary user (SU) interferes with the primary user (PU). Will give.
- the instantaneous INR in the primary user (PU) is expressed as the following formula (24).
- the distribution of INR depends on the value of the ratio of the two chi-square distributions RV.
- the difference from the fixed power control method according to the first comparative example is that, in the optimum power control method according to the first embodiment, the transmission power of the secondary user (SU) for Rayleigh fading is adjusted under the interference limit value. It was found that the constant output SNR in the wireless receiver of the secondary user (SU2) has the maximum value. In other words, it was found that the optimal power control method according to the first embodiment determines the instantaneous INR distribution in the primary user (PU) in consideration of interference channel Rayleigh fading and transmission power fluctuation.
- the probability P r that is greater than the interference power level ⁇ when the INR in the primary user (PU) is false detection (MD) is expressed by the following equation (26).
- a situation is considered in which the first secondary user (SU1) has N antennas, and independent Rayleigh fading is observed with an average value ⁇ 0 of the same SNR.
- an antenna having the maximum instantaneous SNR was selected.
- Energy detection (ED) was then performed using the selected antenna to determine whether the primary user (PU) signal was present or absent.
- FIG. 5 is a diagram for explaining a plot of detection probabilities. Specifically, in FIG. 5, when the average SNR ⁇ 0 of the sensing channel varies from ⁇ 10 dB to 5 dB, the above equation (15) is used when the number N of antennas is varied. The calculated probability of detection is shown as a theoretical value. Here, the detection threshold value obtained by setting the false alarm rate P f to 0.01 in the above equation (9) was used. The number N 0 of samples for energy detection (ED) was set to 10. Furthermore, the empirical detection probabilities obtained from Monte-Carlo simulation that realized 10 5 channels are also shown in FIG. 5 as simulation results.
- the cumulative distribution function (CDF) is a function of the nominal value ⁇ defined by the above equation (22) as described above.
- the maximum value of the constant transmission power P t have a final goal can be obtained so as to satisfy the interference limit.
- the ultimate goal is that the maximum value of the SNR with constant output (that is, ⁇ 2 ) is obtained so as to satisfy the interference limit value.
- FIG. 7 is a diagram for explaining a plot of probability P r ⁇ I n > ⁇
- the optimum power control method according to the first embodiment is superior to the fixed power control method according to the first comparative example in that the number of antennas is different.
- the optimal power control method according to the first embodiment uses the fixed power according to the first comparative example.
- the SNR was improved by 3 dB.
- the fixed power control method according to Comparative Example 1 is applied to a cognitive radio communication system (CRS)
- the secondary user (SU) maximum ratio combining (MRC) type radio receiver has an average value P t ' ⁇ 2 K. A random SNR value according to the chi-square distribution will be observed.
- the optimum power control method according to the first embodiment is applied to the cognitive radio communication system (CRS)
- the secondary user (SU) maximum ratio combining (MRC) type radio receiver has an SNR value of ⁇ ′ ⁇ 2. Will generate an equivalent AWGN channel.
- the present invention can be suitably used in fields such as wireless communication, particularly cognitive wireless communication.
- Base station 10 Wireless communication device (Primary user (PU)) 20, 20a, 20b Wireless communication device (secondary user (SU)) 21 receiver 22 multiple antenna 23 band pass filter 24 RF 27 Spectrum sensor unit 29 Baseband processor 30 Sensing channel 40 Interference channel 50 User channel 100 Cognitive radio communication system
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Abstract
Description
システムモデルは,分析モデルの前提となるものであり,本実施例では,以下のように構築した。
xi=zi (1)
Γ0=GS σu 2/σz 2 (3-2)
Γ1=GI σs 2/σz 2 (5)
Γ2=GU σs 2/σn 2 (7)
続いて,スペクトラムセンシングを行う方法の一例として,エネルギー検出(ED:energy detection)について説明する。エネルギー検出(ED)では,消費電力の少ないデバイスを用いることが可能であり,容易に改良することが可能である。なお,スペクトラムセンシングを行う方法としては,エネルギー検出(ED)に限られることはなく,調和フィルター検出(matched filter detection),周期性検出(cyclostationary property detection)などであってもよい。
続いて,分析モデルを構築した。
第1に,検出の確率に関する閉形式の数式を導くために,エネルギー検出(ED)の結果に基づいたレイリーフェージングの下で,エネルギー検出(ED)を選択的合成(SC:selective combining)とともに用いた。
上記式(14)中の積分部分について公知の式(例えば,1975年にA.H.NuttallによってIEEE Trans.Inform.Theoryで示された式)を用いることにより,下記式(15)に示すような閉形式の数式を得た。この閉形式の数式も,レイリーフェージングチャネルにおける選択的合成(SC)を用いたエネルギー検出(ED)によって検出される確率を示すものである。なお,下記式(15)におけるpは,{2×(n+1)}1/2である。
a=(2Γ0 N0)1/2 (16)
b=(2γ0)1/2/σz (17)
続いて,比較例1による単純固定電力制御方法について説明する。比較例1による電力制御方法は,実施例1による電力制御方法と比較するためのものである。この単純固定電力制御方法では,上述した図4におけるステップS8~S9が実施されない。
上記式(20)において,Pr{In>η|MD}は,Ptの関数であることが既知であるので,第1のセカンダリーユーザー(SU1)の無線送信機は,上述したステップS4’において,Pr{In>η|MD}が,干渉制限値に含まれるパラメーターξよりも小さくなるような最大値Pt’を算出することが可能である。
続いて,実施例1による最適固定電力制御方法について説明する。
上記式(23-2)から分かるように,送信電力Ptがランダム変数RVであり,その分布はγ2に依存する。
Pe=Q(2α’Γ2)1/2 (27)
次に,上述した実施例1と比較例1の分析モデルに対する数値結果について説明する。数値結果は,具体的には,セカンダリーユーザー(SU)間のデータ通信のパフォーマンスを示すものである。
10 無線通信デバイス(プライマリーユーザー(PU))
20,20a,20b 無線通信デバイス(セカンダリーユーザー(SU))
21 受信部
22 多重アンテナ
23 バンドパスフィルター
24 RF
27 スペクトラムセンサー部
29 ベースバンドプロセッサー
30 センシングチャネル
40 干渉チャネル
50 ユーザーチャネル
100 コグニティブ無線通信システム
Claims (6)
- コグニティブ無線通信に用いる通信電力を制御するための電力制御方法であって,
干渉に関する制御情報に基づいてSNR(SN比)の目標値を推定する推定ステップと,
前記推定ステップで推定したSNRの目標値に基づいて前記通信電力を調整する調整ステップと,
を含む,
電力制御方法。 - 前記コグニティブ無線通信を行う無線通信システムは,
コグニティブ無線通信用の基地局と,
無線通信可能な第1の無線通信デバイスと,
無線通信可能な第2の無線通信デバイスと
を含み,
前記第1の無線通信デバイスは,
無線受信機を含み,
前記第2の無線通信デバイスは,
無線送信機を含み,
前記電力制御方法は,
前記基地局が,前記干渉に関する制御情報を,前記第1の無線通信デバイスの前記無線受信機に送信するステップをさらに含み,
前記推定ステップでは,
前記第1の無線通信デバイスの無線受信機が,前記制御情報に基づいて,SNRの目標値を推定するとともに,当該SNRの目標値を含むコマンドを前記第2の無線通信デバイスの無線送信機に通知し,
前記調整ステップでは,
前記第2の無線通信デバイスの前記無線送信機が,前記SNRの目標値に基づいて,前記第2の無線通信デバイスに対して無線信号を送出するための送信電力を調整し,
これにより,前記第1の無線通信デバイスは,前記第2の無線通信デバイスとの間で,前記送信電力で前記コグニティブ無線通信を行う,
請求項1に記載の電力制御方法。 - 前記SNRは,複数の一定出力値から選択可能な1つの一定出力値に対応し,
前記調整ステップは,
前記複数の一定出力値のうち,前記SNRの目標値を超えない一定出力値のうちの最大値を選択するステップと,
前記通信電力の調整として,出力値を,前記最大値をとる一定出力値に変更するステップと
を含む,
請求項1又は請求項2に記載の電力制御方法。 - 前記干渉に関する制御情報は,前記第1の無線通信デバイスにおける干渉電力レベル及び前記第1の無線通信デバイスにおける干渉値が前記干渉電力レベルηを超える確率の最大値である請求項2に記載の電力制御方法。
- 複数の無線通信デバイスを含むコグニティブ無線通信システムであって,
干渉に関する制御情報に基づいてSNRの目標値を推定する第1の無線通信デバイスと,
前記SNRの目標値に基づいて前記通信電力を調整する第2の無線通信デバイスと
を含み,
前記第1の無線通信デバイスと前記第2の無線通信デバイスとの間で,前記調整された通信電力でコグニティブ無線通信を行うことが可能な,
コグニティブ無線通信システム。 - コグニティブ無線通信用の無線通信デバイスであって,
他の無線通信デバイスが,干渉に関する制御情報に基づいて推定したSNRの目標値に基づいて,前記コグニティブ無線通信に用いる通信電力を調整する手段を含み,
前記他の無線通信デバイスとの間で,前記調整された通信電力でコグニティブ無線通信を行うことが可能な,
無線通信デバイス。
Priority Applications (3)
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US13/384,447 US8838162B2 (en) | 2009-07-17 | 2010-07-15 | Power control method in cognitive radio communication, cognitive radio communication system, and radio communication device |
CN201080032450.9A CN102484860B (zh) | 2009-07-17 | 2010-07-15 | 认知无线通信中的功率控制方法、认知无线通信系统以及认知无线通信装置 |
EP10799640.7A EP2456266A4 (en) | 2009-07-17 | 2010-07-15 | POWER CONTROL METHOD IN A COGNITIVE WIRELESS COMMUNICATION, SYSTEM FOR COGNITIVE WIRELESS COMMUNICATION AND DEVICE FOR COGNITIVE WIRELESS COMMUNICATION |
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JP2009168508A JP5408586B2 (ja) | 2009-07-17 | 2009-07-17 | コグニティブ無線通信における電力制御方法,コグニティブ無線通信システム,及び無線通信デバイス |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2013021764A1 (ja) * | 2011-08-11 | 2013-02-14 | ソニー株式会社 | 通信制御装置、通信制御方法、通信システム及び端末装置 |
KR20130124976A (ko) * | 2011-02-16 | 2013-11-15 | 퀄컴 인코포레이티드 | Tv 백색 공간에서 랜덤 액세스 동안 송신 전력 및 변조 및 코딩 방식 선택의 관리 |
JP2014523725A (ja) * | 2011-07-26 | 2014-09-11 | エヌイーシー ヨーロッパ リミテッド | セルラ通信ネットワークにおけるリソース管理方法およびリソース管理システム |
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US9585025B2 (en) | 2011-02-16 | 2017-02-28 | Qualcomm Incorporated | Managing transmit power for better frequency re-use in TV white space |
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JP2014523725A (ja) * | 2011-07-26 | 2014-09-11 | エヌイーシー ヨーロッパ リミテッド | セルラ通信ネットワークにおけるリソース管理方法およびリソース管理システム |
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EP2456266A1 (en) | 2012-05-23 |
US8838162B2 (en) | 2014-09-16 |
EP2456266A4 (en) | 2015-03-25 |
KR20120041200A (ko) | 2012-04-30 |
JP5408586B2 (ja) | 2014-02-05 |
CN102484860A (zh) | 2012-05-30 |
CN102484860B (zh) | 2015-05-13 |
JP2011024068A (ja) | 2011-02-03 |
US20120135780A1 (en) | 2012-05-31 |
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