WO2012173036A1 - 適応変調回路を備えた無線伝送装置および適応変調回路の制御方法 - Google Patents
適応変調回路を備えた無線伝送装置および適応変調回路の制御方法 Download PDFInfo
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- WO2012173036A1 WO2012173036A1 PCT/JP2012/064665 JP2012064665W WO2012173036A1 WO 2012173036 A1 WO2012173036 A1 WO 2012173036A1 JP 2012064665 W JP2012064665 W JP 2012064665W WO 2012173036 A1 WO2012173036 A1 WO 2012173036A1
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- wireless transmission
- traffic volume
- circuit
- traffic
- transmission path
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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
- H04W52/02—Power saving arrangements
- H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
- H04L1/203—Details of error rate determination, e.g. BER, FER or WER
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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
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/262—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account adaptive modulation and coding [AMC] scheme
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
Definitions
- the present invention relates to an adaptive modulation circuit that sends out an Ethernet (registered trademark) signal received from a wired transmission path to an opposite station on a one-to-one basis via a wireless transmission path, and outputs the Ethernet signal again to the wired transmission path at the opposite station.
- the present invention relates to a method of controlling a wireless transmission device and an adaptive modulation circuit.
- a transmission / reception apparatus estimates a propagation path condition based on a received signal, and a modulation scheme that satisfies a certain level of communication quality in the propagation path condition and has the highest transmission rate is a first modulation scheme. Is determined (see, for example, Patent Document 1).
- the wireless transmission device described in Patent Literature 1 detects the traffic volume of transmission data, and determines the modulation scheme that provides the lowest transmission rate at which the traffic volume can be transmitted as the second modulation scheme.
- This wireless transmission apparatus selects a transmission modulation scheme having a lower transmission rate from the first modulation scheme and the second modulation scheme. Furthermore, this wireless transmission device reduces power consumption by sequentially selecting a modulation method so as to obtain a wireless transmission capacity corresponding to the traffic volume.
- Patent Document 2 As a conventional wireless transmission device, one that uses a communication traffic amount for information for determining communication capability by a communication control function is known (for example, see Patent Document 2).
- the wireless transmission device described in Patent Literature 2 uses a communication time zone for information for determining communication capability by a communication control function. This wireless transmission device can realize optimal communication capability and optimal power consumption according to communication traffic conditions, and can realize optimal communication capability and optimal power consumption according to the communication time zone.
- the wireless transmission device disclosed in Patent Literature 1 can reduce power consumption by sequentially selecting a modulation method so as to obtain a wireless transmission capacity corresponding to the amount of traffic.
- this wireless transmission device uses an adaptive modulation control system that is linked to the traffic volume that changes sequentially, the adaptive modulation control follows the instantaneous fluctuation of the transmission signal. Therefore, the technique described in Patent Document 1 cannot provide a sufficient power consumption suppression effect.
- Patent Document 2 it is possible to realize optimal communication capability and optimal power consumption according to communication traffic conditions, and optimal communication capability and optimal power consumption according to the communication time zone. Can be realized.
- processing is performed based on a predetermined amount of information. Therefore, this apparatus cannot be applied by itself in accordance with the characteristics of the actual operation line in order to perform a fixed time operation in advance.
- the present invention has been made to solve the above-described problems, and the purpose thereof is to reduce wireless transmission power in a time zone where the amount of traffic is statistically small, depending on the installation environment, and to reduce power consumption. It is an object of the present invention to provide a wireless transmission device including an adaptive modulation circuit that can acquire the above and a method for controlling the adaptive modulation circuit.
- a wireless transmission device including an adaptive modulation circuit transmits an Ethernet signal received from a wired transmission path to an opposite station on a one-to-one basis via the wireless transmission path, and the Ethernet signal is transmitted to the opposite station.
- a wireless transmission device for outputting again to a wired transmission path comprising a traffic statistical circuit that accumulates traffic volume of Ethernet signals by time zone as statistical data, and based on the statistical data accumulated in the traffic statistical circuit, traffic In the time zone with a small amount, the radio transmission capacity is reduced by reducing the multi-value number of the modulation scheme.
- a wireless transmission device including an adaptive modulation circuit transmits an Ethernet signal received from a wired transmission path to an opposite station on a one-to-one basis via the wireless transmission path, and the Ethernet signal is transmitted to the opposite station.
- a wireless transmission device that outputs to a wired transmission path again, accumulates the traffic volume of Ethernet signals by time zone as statistical data, and at the same time zone based on traffic volume information accumulated over a predetermined period.
- a wireless transmission path that has a traffic statistics circuit that calculates the mode value of traffic volume information and generates statistical traffic volume information, and is generated by reducing the number of modulation schemes within a range where a certain line quality can be secured The wireless transmission power corresponding to the received electric field margin is reduced.
- a wireless transmission device including an adaptive modulation circuit transmits an Ethernet signal received from a wired transmission path to an opposite station on a one-to-one basis via the wireless transmission path, and the Ethernet signal is transmitted to the opposite station.
- a traffic statistical circuit for calculating a mode value of traffic volume information and generating statistical traffic volume information, and based on the statistical data accumulated in the traffic statistical circuit, a multi-value of a modulation method in a time zone when the traffic volume is small
- the wireless transmission capacity can be reduced, and at the same time a certain line quality can be secured.
- a wireless transmission apparatus including an adaptive modulation circuit selects a predetermined modulation method and wireless transmission power according to statistical traffic volume information obtained from the traffic statistical circuit, and performs wireless transmission.
- a modulation scheme setting circuit that generates capacity information, modulation scheme information, and radio transmission power control information is provided.
- a method for controlling an adaptive modulation circuit in which an Ethernet signal received from a wired transmission path is sent to an opposite station on a one-to-one basis via a wireless transmission path, and the Ethernet signal is transmitted to the wired transmission path at the opposite station.
- the method of controlling the adaptive modulation circuit that outputs again in the above-mentioned method, wherein the traffic volume of the Ethernet signal for each time zone is accumulated as statistical data, and based on the statistical data, the time zone with a low traffic volume is a multi-level number of modulation schemes.
- the radio transmission power corresponding to the reception electric field margin of the radio transmission path generated by reducing the multi-value number of the modulation scheme within a range in which a certain line quality can be secured is reduced. Reduce.
- the wireless transmission device provided with the adaptive modulation circuit and the control method for the adaptive modulation circuit according to the present invention, it is possible to suppress the wireless transmission power in a time zone in which the traffic volume is statistically small according to the installation environment. Reduction effect can be acquired.
- FIG. 6A is a time transition diagram of statistical traffic volume information generated by a traffic statistical circuit in the adaptive modulation circuit control method according to the embodiment of the present invention.
- B is a time transition diagram of the radio transmission capacity selected based on the statistical traffic volume information received from the traffic statistics circuit by the modulation scheme setting circuit in the adaptive modulation circuit control method according to one embodiment of the present invention.
- C is a time transition diagram of the modulation scheme selected by the modulation scheme setting circuit based on the statistical traffic volume information received from the traffic statistical circuit in the adaptive modulation circuit control method according to one embodiment of the present invention.
- FIG. 6A is a time transition diagram of statistical traffic volume information generated by a traffic statistical circuit in the adaptive modulation circuit control method according to the embodiment of the present invention.
- B is a time transition diagram of the radio transmission capacity selected based on the statistical traffic volume information received from the traffic statistics circuit by the modulation scheme setting circuit in the adaptive modulation circuit control method according to one embodiment of the present invention.
- C is a time transition diagram of the modulation scheme selected
- 6D is a time transition diagram of radio transmission power selected based on statistical traffic volume information received from the traffic statistics circuit by the modulation scheme setting circuit in the adaptive modulation circuit control method according to the embodiment of the present invention
- 5 is a table determined by the relationship between a value of a statistical traffic volume and a threshold value in the adaptive modulation circuit control method according to the embodiment of the present invention.
- the wireless transmission device 10 includes an adaptive modulation function connected to a wired transmission path 11.
- the wireless transmission device 10 is connected to a wireless transmission path 13 via a circulator 12 that separates a wireless transmission signal into a transmission signal and a reception signal.
- the wireless transmission device 10 includes a transmission buffer 14, a transmission circuit 15, a transmission power control circuit 16, a traffic statistics circuit 17, a modulation scheme setting circuit 18, and a reception circuit 19.
- the wireless transmission device 10 outputs the Ethernet signal received from the wired transmission path 11 to the wireless transmission path 13 via the transmission buffer 14, the transmission circuit 15, the transmission power control circuit 16, and the circulator 12. Further, the wireless transmission device 10 outputs an Ethernet signal received from an opposite station (not shown) via the wireless transmission path 13 to the wired transmission path 11 via the circulator 12 and the reception circuit 19.
- the traffic statistics circuit 17 constantly monitors the Ethernet signal received from the wired transmission path 11, detects the traffic volume in predetermined time units, and accumulates traffic volume information for each time zone. Further, the traffic statistics circuit 17 generates a statistical traffic volume information by calculating a mode value of the traffic volume information in the same time period based on the traffic volume information accumulated for a predetermined period, and generates a modulation traffic method to be described later. The setting circuit 18 is notified.
- the modulation scheme setting circuit 18 selects a predetermined modulation scheme and radio transmission power according to the statistical traffic volume information received from the traffic statistics circuit 17, and performs radio transmission capacity information, modulation scheme information, and radio transmission power. Generate control information. Then, modulation scheme setting circuit 18 outputs the generated radio transmission capacity information, modulation scheme information, and radio transmission power control information to transmission buffer 14, transmission circuit 15, and transmission power control circuit 16, respectively.
- FIG. 2A shows a time transition of the statistical traffic volume information generated by the traffic statistical circuit 17, and th1 and th2 change the wireless transmission capacity 32, the modulation method 33, and the wireless transmission power 34.
- FIG. 2A The threshold value of the statistical traffic amount 31 as a reference is shown.
- times t1, t2, and t3 indicate times when the statistical traffic volume 31 crosses the threshold values th1 and th2.
- the radio transmission capacity 32 is set to the values c1 to c3 and the modulation scheme 33 is set to the values m1 to m3 by referring to the table of the relationship between the value of the statistical traffic amount X and the threshold values th1 and th2 shown in FIG.
- the wireless transmission power 34 is determined to be values p1 to p3.
- the value of c2 is selected as the wireless transmission capacity, the value of m2 as the modulation scheme, and the value of p2 as the wireless transmission power.
- the transmission buffer 14 temporarily stores the Ethernet signal when the traffic of the Ethernet signal received from the wired transmission path 11 is congested. At the same time, the transmission buffer 14 outputs an Ethernet signal corresponding to the wireless transmission capacity to the transmission circuit 15 based on the wireless transmission capacity information received from the modulation scheme setting circuit 18.
- the transmission circuit 15 selects a radio modulation scheme based on the modulation scheme information received from the modulation scheme setting circuit 18, multiplexes the Ethernet signal received from the transmission buffer 14 with the radio signal, generates a radio transmission signal, and transmits it.
- the power is output to the power control circuit 16.
- the transmission power control circuit 16 selects the wireless transmission power based on the wireless transmission power information received from the modulation scheme setting circuit 18, and transmits the wireless transmission signal received from the transmission circuit 15 to the wireless transmission path 13 via the circulator 12. Output.
- the reception circuit 19 extracts an Ethernet signal multiplexed by a counter station (not shown) from the radio reception signal received from the radio transmission path 13 via the circulator 12 and outputs the Ethernet signal to the wired transmission path 11.
- the adaptive modulation circuit control method executed by the wireless transmission device 10 is shown in FIG. 1 to FIG. 1 in accordance with the time transition diagrams shown in FIG. 2 (a), (b), (c), and (d).
- the time zone up to time t1 shows a time zone in which the traffic volume is statistically small. Therefore, a section is shown in which control is performed to reduce the multi-value number of the modulation scheme and to suppress transmission power corresponding to the margin of the received electric field within a range in which the channel quality can be secured.
- the modulation scheme setting circuit 18 informs the transmission power control circuit 16 that the wireless transmission capacity 32 is c1 for the transmission buffer 14, and that the modulation scheme 33 is m1 for the transmission circuit 15. To notify that the wireless transmission power 34 is p1.
- a time zone between times t2 and t3 indicates a time zone in which the traffic volume is statistically large. Therefore, a section is shown in which control is performed to increase the transmission power in order to secure the transmission capacity by increasing the multi-value number of the modulation scheme and to ensure the necessary line quality.
- the modulation scheme setting circuit 18 informs the transmission power control circuit 16 that the wireless transmission capacity 32 is c3 for the transmission buffer 14 and the modulation scheme 33 is m3 for the transmission circuit 15. It is notified that the wireless transmission power 34 is p3.
- the modulation scheme setting circuit 18 indicates to the transmission power control circuit 16 that the radio transmission capacity 32 is c2 for the transmission buffer 14, and that the modulation scheme 33 is m2 for the transmission circuit 15. It is notified that the wireless transmission power 34 is p2.
- the wireless transmission device 10 can absorb the instantaneous increase in traffic volume by the transmission buffer 14 and can suppress transmission power in a time zone where the traffic volume is small based on statistical data.
- the statistical traffic volume information is generated by calculating the mode value of the traffic volume information in the same time period based on the traffic volume information accumulated in the traffic statistics circuit 17.
- the method of calculating the statistical traffic amount is not limited to the mode value, and can also be implemented by a method of obtaining a peak value or an average value.
- the traffic to be statistics does not have to be all traffic, and only traffic that meets a specific condition such as data size or traffic type may be subject to statistics.
- an instantaneous traffic increase is absorbed by the transmission buffer 14.
- the traffic statistics circuit 17 aggregates the traffic volume of the Ethernet signal for each time zone and accumulates it as a statistical traffic volume.
- wireless transmission is performed by reducing the multi-value number of the wireless modulation method in a time zone with a small traffic volume based on the statistical traffic volume accumulated in the traffic statistical circuit 17. Suppress capacity. Therefore, according to the wireless transmission device 10 including the adaptive modulation circuit, power consumption can be reduced by suppressing the wireless transmission capacity.
- the transmission buffer 14 absorbs an instantaneous traffic increase. Then, according to the wireless transmission device 10 provided with the adaptive modulation circuit, the traffic statistics circuit 17 aggregates the traffic volume of the Ethernet signal for each time zone and accumulates it as a statistical traffic volume. Further, according to the wireless transmission device 10 provided with the adaptive modulation circuit, the wireless transmission power is suppressed within a range in which the line quality can be ensured in a time zone where the traffic amount is small based on the statistical traffic amount accumulated in the traffic statistical circuit 17. To do. Therefore, according to the wireless transmission device 10 including the adaptive modulation circuit, power consumption can be reduced by suppressing the wireless transmission capacity.
- the transmission buffer 14 absorbs an instantaneous traffic increase.
- the traffic statistics circuit 17 aggregates the traffic volume of the Ethernet signal for each time zone and accumulates it as a statistical traffic volume. Further, according to the wireless transmission device 10 provided with the adaptive modulation circuit, the multi-value number of the wireless modulation scheme is reduced in the time zone when the traffic volume is small based on the statistical traffic volume accumulated in the traffic statistical circuit 17.
- the wireless transmission power is reduced within a range in which the line quality can be ensured in a time zone with a small traffic volume based on the statistical traffic volume accumulated in the traffic statistical circuit 17. Suppress. Therefore, according to the wireless transmission device 10 including the adaptive modulation circuit, power consumption can be reduced by suppressing the wireless transmission capacity.
- a predetermined modulation scheme and wireless transmission power are determined in accordance with the statistical traffic volume information obtained from the traffic statistical circuit 17.
- a modulation scheme setting circuit 18 that generates radio transmission capacity information, modulation scheme information, and radio transmission power control information. Therefore, according to the wireless transmission device 10 provided with the adaptive modulation circuit, the wireless transmission capacity and the wireless transmission power can be intensively suppressed by the modulation scheme setting circuit 18 in a time zone with a small amount of statistical traffic.
- the instantaneous traffic increase is absorbed, and the traffic volume of the Ethernet signal is totaled for each time zone and accumulated as the statistical traffic volume.
- the multi-value number of the radio modulation scheme is reduced in a time zone with a small traffic volume based on the accumulated statistical traffic volume.
- the radio transmission power is suppressed within a range in which the channel quality can be ensured in a time zone where the traffic volume is small based on the accumulated statistical traffic volume. . Therefore, according to the control method of the adaptive modulation circuit according to the embodiment of the present invention, the power consumption can be reduced by suppressing the radio transmission capacity.
- wireless transmission apparatus including the adaptive modulation circuit and the control method of the adaptive modulation circuit according to the embodiment of the present invention are not limited to the above-described embodiment, and appropriate modifications and improvements can be made. is there.
- the wireless transmission power in a time zone in which the traffic volume is statistically small can be reduced according to the installation environment. It can suppress and can acquire the reduction effect of power consumption.
- the present invention can be applied to infrastructure communication devices used by telecommunications carriers and the like, in particular, fixed wireless transmission devices using microwaves and millimeter waves, and the industrial applicability of the present invention can be said to be great.
- a radio transmission apparatus equipped with an adaptive modulation circuit that can suppress radio transmission power in a time zone in which the traffic volume is statistically small and obtain an effect of reducing power consumption according to the installation environment, and a method for controlling the adaptive modulation circuit be able to.
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Abstract
Description
特許文献1に記載された無線伝送装置は、送信データのトラフィック量を検出し、トラフィック量を伝送可能な最低の伝送速度となる変調方式を第2の変調方式として決定する。
この無線伝送装置は、第1の変調方式と第2の変調方式の内、伝送速度が低い方を送信変調方式として選択する。
さらにこの無線伝送装置は、トラフィック量に応じた無線伝送容量となるように変調方式を逐次選択することで消費電力を低減する。
特許文献2に記載された無線伝送装置は、通信制御機能により通信能力を決定するための情報に通信時間帯を使用する。
この無線伝送装置は、通信トラフィック条件に応じた最適な通信能力と最適な電力消費とを実現でき、通信時間帯に応じた最適な通信能力と最適な電力消費とを実現できる。
一般的な技術として、無線変調方式の多値数を大きくすると無線伝送容量は増加するが無線伝送路のエラー耐性は低下し、変調方式の多値数を小さくすると無線伝送容量は低下するが高いエラー耐性を確保できる。
つまり、同一の無線伝搬条件においては、多値数が小さい変調方式を用いた方が、より低い送信電力において良好な伝搬特性を得ることが可能となる。
通常、トラフィック量は時々刻々と変化するが、運用時間帯とトラフィック量に相関があることが知られている。
特に、連続的に無線送受信を行う無線伝送装置を用いて不連続信号列を伝送する場合、伝送するトラフィックが存在しない状態においても常に無線送受信を維持している状態となる。
トラフィック量が減少した状況でも常に一定の電力を消費することから、回線状態やトラフィック量に応じた電力制御が求められていた。
しかし、この無線伝送装置においては、逐次変化するトラフィック量に連動した適応変調制御方式であるために、伝送信号の瞬時変動に対して適応変調制御が追従してしまう。
従って、特許文献1に記載された技術では、十分な消費電力抑制効果が得られない。
しかし、特許文献2の無線伝送装置においては、あらかじめ定めた情報量に基づいて処理が行われる。
従って、この装置は、予め固定的に定められた時間運用を行うために、実運用回線の特性に併せて自ら適用するようにできない。
図1に示すように、無線伝送装置10は、有線伝送路11に接続された適応変調機能を具備している。
無線伝送装置10は、無線伝送信号を送信信号と受信信号とに分離するサーキュレータ12を介して無線伝送路13に接続されている。
無線伝送装置10は、送信バッファ14と、送信回路15と、送信電力制御回路16と、トラフィック統計回路17と、変調方式設定回路18と、受信回路19とから構成される。
また、無線伝送装置10は、無線伝送路13を介して図示しない対向局から受信したイーサネット信号をサーキュレータ12および受信回路19を介して有線伝送路11に出力する。
また、トラフィック統計回路17は、あらかじめ定めた一定期間に蓄積したトラフィック量情報をもとに同一時間帯のトラフィック量情報の最頻値を算出して統計トラフィック量情報を生成し、後述する変調方式設定回路18に通知する。
そして、変調方式設定回路18は、生成した無線伝送容量情報、変調方式情報、および無線送信電力制御情報を、送信バッファ14、送信回路15、および送信電力制御回路16にそれぞれ出力する。
なお、図2の(a)は、トラフィック統計回路17が生成した統計トラフィック量情報の時間推移を示しており、th1、th2は無線伝送容量32、変調方式33、および無線送信電力34を変更する基準となる統計トラフィック量31の閾値を示している。
また、図2の(a)において、時刻t1、t2、t3は統計トラフィック量31が閾値th1、th2をクロスする時の時刻を示している。
図2における(b)、(c)、(d)は、変調方式設定回路18がトラフィック統計回路17から受信した統計トラフィック量情報に基づいて選択した無線伝送容量32、変調方式33、および無線送信電力34の時間推移をそれぞれ示している。
そして、図3に示す統計トラフィック量Xの値と、閾値th1、th2との関係のテーブルを参照することにより、無線伝送容量32がc1~c3の値に、変調方式33がm1~m3の値に、無線送信電力34がp1~p3の値にそれぞれ決定される。
そのため、無線伝送容量にc2の値を、変調方式にm2の値を、無線送信電力にp2の値をそれぞれ選択する。
同時に、送信バッファ14は、変調方式設定回路18から受信した無線伝送容量情報に基づき、無線伝送容量に応じたイーサネット信号を送信回路15に出力する。
送信回路15は、変調方式設定回路18から受信した変調方式情報に基づいて無線変調方式を選択するとともに、送信バッファ14から受信したイーサネット信号を無線信号に多重して無線送信信号を生成し、送信電力制御回路16に出力する。
送信電力制御回路16は、変調方式設定回路18から受信した無線送信電力情報に基づいて無線送信電力を選択し、送信回路15から受信した無線送信信号を、サーキュレータ12を介して無線伝送路13に出力する。
受信回路19は、サーキュレータ12を介して無線伝送路13から受信した無線受信信号から、図示しない対向局で多重されたイーサネット信号を抽出して有線伝送路11に出力する。
図2の(a)、(b)、(c)、および(d)において、時刻t1までの時間帯は、トラフィック量が統計的に少ない時間帯を示している。
そのため、変調方式の多値数を小さくするとともに、回線品質が確保可能な範囲で受信電界のマージン分の送信電力を抑制する制御を実施する区間を示している。
このとき、統計トラフィック量31が閾値th1を下回っていることから、図3に示す条件1に該当する。
これにより、変調方式設定回路18は、送信バッファ14に対して無線伝送容量32がc1であることを、送信回路15に対して変調方式33がm1であることを、送信電力制御回路16に対して無線送信電力34がp1であることをそれぞれ通知する。
そのため、変調方式の多値数を上げて伝送容量を確保するとともに、必要な回線品質を確保するために送信電力を上げる制御を実施する区間を示している。
このとき、統計トラフィック量31が閾値th2を上回っていることから、図3に示す条件3に該当する。
これにより、変調方式設定回路18は、送信バッファ14に対して無線伝送容量32がc3であること、送信回路15に対して変調方式33がm3であることを、送信電力制御回路16に対して無線送信電力34がp3であることをそれぞれ通知する。
そのため、変調方式設定回路18は、送信バッファ14に対して無線伝送容量32がc2であることを、送信回路15に対して変調方式33がm2であることを、送信電力制御回路16に対して無線送信電力34がp2であることをそれぞれ通知する。
これとは異なり、他の実施形態として、統計トラフィック量の算出方法は最頻値に限らず、ピーク値や平均値を求める方法でも実施できる。
また、さらに異なる実施形態として、統計対象とするトラフィックについては、全トラフィックである必要はなく、データサイズやトラフィック種別など特定条件に合致するトラフィックのみを統計の対象としても良い。
そして、適応変調回路を備えた無線伝送装置10によれば、トラフィック統計回路17がイーサネット信号のトラフィック量を時間帯別に集計して統計トラフィック量として蓄積する。
さらに、適応変調回路を備えた無線伝送装置10によれば、トラフィック統計回路17に蓄積された統計トラフィック量に基づきトラフィック量の少ない時間帯は、無線変調方式の多値数を小さくして無線伝送容量を抑制する。
従って、適応変調回路を備えた無線伝送装置10によれば、無線伝送容量を抑制することにより、消費電力を削減できる。
そして、適応変調回路を備えた無線伝送装置10によれば、トラフィック統計回路17がイーサネット信号のトラフィック量を時間帯別に集計して統計トラフィック量として蓄積する。
さらに、適応変調回路を備えた無線伝送装置10によれば、トラフィック統計回路17に蓄積された統計トラフィック量に基づきトラフィック量の少ない時間帯は、回線品質が確保可能な範囲で無線送信電力を抑制する。
従って、適応変調回路を備えた無線伝送装置10によれば、無線伝送容量を抑制することにより、消費電力を削減できる。
そして、適応変調回路を備えた無線伝送装置10によれば、トラフィック統計回路17がイーサネット信号のトラフィック量を時間帯別に集計して統計トラフィック量として蓄積する。
さらに、適応変調回路を備えた無線伝送装置10によれば、トラフィック統計回路17に蓄積された統計トラフィック量に基づきトラフィック量の少ない時間帯は、無線変調方式の多値数を小さくする。
加えて、適応変調回路を備えた無線伝送装置10によれば、トラフィック統計回路17に蓄積された統計トラフィック量に基づきトラフィック量の少ない時間帯は、回線品質が確保可能な範囲で無線送信電力を抑制する。
従って、適応変調回路を備えた無線伝送装置10によれば、無線伝送容量を抑制することにより、消費電力を削減できる。
従って、適応変調回路を備えた無線伝送装置10によれば、変調方式設定回路18により、統計トラフィック量の少ない時間帯において無線伝送容量および無線送信電力を集中的に抑制できる。
そして、本発明の一実施形態に係わる適応変調回路の制御方法によれば、蓄積された統計トラフィック量に基づきトラフィック量の少ない時間帯は、無線変調方式の多値数を小さくする。
さらに、本発明の一実施形態に係わる適応変調回路の制御方法によれば、蓄積された統計トラフィック量に基づきトラフィック量の少ない時間帯は、回線品質が確保可能な範囲で無線送信電力を抑制する。
従って、本発明の一実施形態に係わる適応変調回路の制御方法によれば、無線伝送容量を抑制することにより、消費電力を削減できる。
以上の結果として、通信事業者等が使用するインフラ向け通信機器、特にマイクロ波・ミリ波等を用いた固定無線伝送装置に適用でき、本発明の産業上の利用可能性は大といえる。
設置環境に応じて、統計的にトラフィック量が少ない時間帯の無線送信電力を抑制でき、消費電力の削減効果を取得できる適応変調回路を備えた無線伝送装置および適応変調回路の制御方法を提供することができる。
11 有線伝送路
13 無線伝送路
17 トラフィック統計回路
18 変調方式設定回路
Claims (5)
- 有線伝送路から受信したイーサネット信号を、無線伝送路を介して1対1で対向局へ送出し、対向局で前記イーサネット信号を有線伝送路に再び出力する無線伝送装置であって、
時間帯別のイーサネット信号のトラフィック量を統計データとして蓄積するトラフィック統計回路を備え、
前記トラフィック統計回路に蓄積された前記統計データに基づき、前記トラフィック量が少ない時間帯は変調方式の多値数を小さくすることにより無線伝送容量を抑制する適応変調回路を備えた無線伝送装置。 - 有線伝送路から受信したイーサネット信号を、無線伝送路を介して1対1で対向局へ送出し、対向局で前記イーサネット信号を有線伝送路に再び出力する無線伝送装置であって、
時間帯別のイーサネット信号のトラフィック量を統計データとして蓄積するとともに、あらかじめ定めた一定期間に蓄積したトラフィック量情報をもとに同一時間帯のトラフィック量情報の最頻値を算出して統計トラフィック量情報を生成するトラフィック統計回路を備え、
一定の回線品質が確保可能な範囲において変調方式の多値数を小さくすることで生じた無線伝送路の受信電界マージンに相当する無線送信電力を抑制する適応変調回路を備えた無線伝送装置。 - 有線伝送路から受信したイーサネット信号を、無線伝送路を介して1対1で対向局へ送出し、対向局で前記イーサネット信号を有線伝送路に再び出力する無線伝送装置であって、
時間帯別のイーサネット信号のトラフィック量を統計データとして蓄積するとともに、あらかじめ定めた一定期間に蓄積したトラフィック量情報をもとに同一時間帯のトラフィック量情報の最頻値を算出して統計トラフィック量情報を生成するトラフィック統計回路を備え、
前記トラフィック統計回路に蓄積された前記統計データに基づき、前記トラフィック量が少ない時間帯は変調方式の多値数を小さくすることにより無線伝送容量を削減するとともに、一定の回線品質が確保可能な範囲において変調方式の多値数を小さくすることで生じた無線伝送路の受信電界マージンに相当する無線送信電力を抑制する適応変調回路を備えた無線伝送装置。 - 請求項1ないし請求項3のうちのいずれか1項に記載の適応変調回路を備えた無線伝送装置において、
前記トラフィック統計回路から得られた統計トラフィック量情報に応じて、あらかじめ定めた変調方式と無線送信電力とを選択して、無線伝送容量情報、変調方式情報、および無線送信電力制御情報を生成する変調方式設定回路を備える適応変調回路を備えた無線伝送装置。 - 有線伝送路から受信したイーサネット信号を、無線伝送路を介して1対1で対向局へ送出し、対向局で前記イーサネット信号を有線伝送路に再び出力する適応変調回路の制御方法であって、
時間帯別のイーサネット信号のトラフィック量を統計データとして蓄積し、前記統計データに基づき、前記トラフィック量が少ない時間帯は変調方式の多値数を小さくすることにより無線伝送容量を削減するとともに、一定の回線品質が確保可能な範囲において変調方式の多値数を小さくすることで生じた無線伝送路の受信電界マージンに相当する無線送信電力を抑制する適応変調回路の制御方法。
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JP2005260414A (ja) | 2004-03-10 | 2005-09-22 | Matsushita Electric Ind Co Ltd | イーサネット(登録商標)接続装置 |
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