JP2005328231A - Wireless terminal device - Google Patents

Wireless terminal device Download PDF

Info

Publication number
JP2005328231A
JP2005328231A JP2004143324A JP2004143324A JP2005328231A JP 2005328231 A JP2005328231 A JP 2005328231A JP 2004143324 A JP2004143324 A JP 2004143324A JP 2004143324 A JP2004143324 A JP 2004143324A JP 2005328231 A JP2005328231 A JP 2005328231A
Authority
JP
Japan
Prior art keywords
transmission power
intensity
access point
signal
strength
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2004143324A
Other languages
Japanese (ja)
Inventor
Masaru Kuroda
勝 黒田
Original Assignee
Ricoh Co Ltd
株式会社リコー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd, 株式会社リコー filed Critical Ricoh Co Ltd
Priority to JP2004143324A priority Critical patent/JP2005328231A/en
Publication of JP2005328231A publication Critical patent/JP2005328231A/en
Application status is Pending legal-status Critical

Links

Images

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/10Techniques for reducing energy consumption in wireless communication networks according to the Radio Access Technology [RAT]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/10Techniques for reducing energy consumption in wireless communication networks according to the Radio Access Technology [RAT]
    • Y02D70/14Techniques for reducing energy consumption in wireless communication networks according to the Radio Access Technology [RAT] in Institute of Electrical and Electronics Engineers [IEEE] networks
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/40According to the transmission technology
    • Y02D70/44Radio transmission systems, i.e. using radiation field
    • Y02D70/448Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • Y02D70/449Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless terminal device capable of stably reducing power consumption by suppressing the strength of transmitting power to low and proper strength with high stability and flexibility. <P>SOLUTION: The wireless terminal device is provided with a distance estimator 303 which estimates a distance in-between an access point AP1 on the basis of the radio field intensity of a beacon signal received from the access point AP1, a transmitting power determining part 305 for determining the strength of the transmitting power of a wireless signal on the basis of the estimated distance, and a transmitting power control unit 307 for gradually increasing the strength of the determined transmitting power from a low level. The transmitting power control unit 307 detects the strength of the transmitting power at the time of receiving a signal which shows the completion of link establishment from the access point AP1 when a wireless LAN is established, and makes the wireless terminal device to execute data communication by using the strength of the transmitting power. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、アクセスポイントを介し無線LANを構築するステーション端末(無線端末装置)に対し無線信号の送信電力を低レベルに抑えて消費電力を低減する構成を備えてなる無線端末装置に関する。 The present invention relates to a radio terminal apparatus that station terminal to construct a wireless LAN via an access point (wireless terminal) to become comprises a configuration for reducing power consumption by suppressing the transmission power of the radio signal to a low level.

例えば、IEEE802.11に規定される無線LAN装置には、ルータ等のアクセスポイントを経由したステーション端末間で通信するインフラストラクチャモードとステーション端末間を直接通信するアドホックモードがある。 For example, the wireless LAN device as defined in IEEE802.11, it is ad-hoc mode for direct communication between the infrastructure mode and the terminal for communication between stations terminal via an access point such as a router.

一般的に無線LAN環境を構築する場合には、インフラストラクチャモードで構成することが多い。 When constructing a wireless LAN environment are typically often configured in infrastructure mode. アクセスポイントを経由するデータ送受信は、ステーション端末とアクセスポイントとの間でのリンク確立を行ったあとで、データ通信が行われる。 Data transmission and reception via the access point, after performing the link establishment between the station terminal and the access point, data communication is performed. ここで言うリンク確立とは、認証(Authentication)やアソシエーション(Association)などが含まれる。 Here, the link establishment to say, are included such as authentication (Authentication) and Association (Association).

一つのアクセスポイントの中に複数あるいは単数のステーション端末で構成される領域をBSS(Basic Service Set)と呼ぶ。 The region consists of the station terminal of the plurality or singular in a single access point is called a BSS (Basic Service Set). 一つのBSSに対してリンク確立を行う際に、一般的にステーション端末は、最大の送信電力を出してアクセスポイントに接続することを試みる。 When performing link establishment for one BSS, generally station terminal attempts to connect to the access point out the maximum transmission power. これは、ステーション端末がどれだけでも強い電波を出すことによって、アクセスポイントがその電波を拾いやすくするためである。 This can be accomplished by a strong RF station terminal even much, because the access point is likely to pick up the radio wave.

しかし、最大レベルでの電波送出はステーション端末の消費電力を抑えるという意味においては必ずしも好ましくなく、必要最小限で電波送出できることが望ましい。 However, not necessarily preferable in the sense that wave transmission at the maximum level reduces power consumption of the station terminal, it is desirable to be able to wave transmission minimum necessary.

その従来例として、例えば一つには、親局は所定の送信電力で信号を送信し、子局は親局から受信した信号の電界強度を検出し、電界強度が大きい場合は送信電力を低下させ、逆に小さい場合は送信電力を増大させるというTDD無線通信システムが知られている(例えば特許文献1参照。)。 As a conventional example, for example one, the master station transmits a signal at a predetermined transmission power, the slave station detects the field strength of a signal received from the master station, if the electric field strength is large reduces the transmission power is, TDD radio communication systems are known that smaller conversely increases the transmission power (for example, see Patent Document 1.).

また一つには、LANに無線リンクを介して接続されるルータは、MANのトポロジを示すテーブルを記憶し、無線リンクの品質とネットワークのトラヒック負荷とを示す情報を受信し、該情報に基づいて伝送の方式と伝送経路を最適化し、これによりコスト、電力および帯域幅の利用を効率化するという所謂無線MANネットワーク装置が知られている(例えば特許文献2参照。)。 For one thing also routers connected via a wireless link to a LAN, and stores a table indicating the topology of the MAN, receives information indicating the traffic load of quality and network radio link, based on the information optimizing method and transmission path of the transmission Te, thereby cost, so-called wireless MAN network apparatus is known that the efficiency of the use of power and bandwidth (e.g., see Patent Document 2.).

特開2000−261392号公報 JP 2000-261392 JP 特表2001−520480号公報 JP-T 2001-520480 JP

前者の従来例には、親局からの受信信号の強度やデータエラーレートを判定しながら送信電力を制御する旨記載されているが、この方式によると受信した信号強度に応じて動的に変化するので、例えばフェージングなどの電波障害が起きたときに必ずしも最適な送信電力に制御できるとは限らず安定性に問題がある。 The conventional example of the former, are described that controlling the transmission power while determining the strength and data error rate of the received signal from the master station, dynamically changed according to the signal strength received According to this method since, for example, there is a stability problem not always be controlled to the optimum transmit power when the interference, such as fading occurs.

後者の従来例には、受信した信号品質を判定する手段を用いて送信データの切り替えを行うという特徴があるが、信号品質の程度に応じて柔軟に対応するという観点からは不充分な構成であり柔軟性に欠けるという問題がある。 The conventional example of the latter, there is a feature that switches the transmission data by using the means for determining the received signal quality, with insufficient configuration from the viewpoint of flexibility depending on the degree of signal quality Yes there is a problem of lack of flexibility.

本発明は、上記問題を解決し、無線LANを構築する際に、その送信電力の強度を高い安定性および柔軟性を以って適切な強度に低く抑え、これにより安定的に消費電力を低減することができる無線端末装置を提供することを目的とする。 The present invention is to solve the above problems, in constructing a wireless LAN, the suppressed low to an appropriate strength high stability and flexibility strength I than the transmission power, thereby stably reduce power consumption and to provide a wireless terminal device capable of.

上記目的を達成するため、本発明は、アクセスポイントから受信したビーコン信号の電波強度に基づいて該アクセスポイントとの距離を推定する距離推定部と、前記距離推定部が推定した距離に基づいて無線信号の送信電力の強度を決定する送信電力決定部と、前記送信電力決定部が決定した送信電力の強度を低レベルから徐々に上げていく送信電力制御部とを備え、前記送信電力制御部は、無線LANを確立する際に、前記アクセスポイントからリンク確立完了を示す信号を受信した時点の前記送信電力の強度を検出し、以後、該送出電力の強度を用いてデータ通信を行わせることを特徴とする。 To achieve the above object, the present invention includes a distance estimation unit that estimates a distance between the access points based on the radio wave intensity of the beacon signal received from the access point, wireless based on the distance the distance estimation unit has estimated a transmission power determining unit for determining the intensity of the transmission power of the signal, the intensity of transmission transmit power power determining unit has determined a transmission power control section gradually increased from a low level, the transmission power control unit , when establishing the wireless LAN, and the detecting the intensity of the transmission power at the time of receiving the signal indicating the link establishment completion from the access point, thereafter, that to perform data communication using the intensity of said transmission output power and features.

前記送信電力決定部は、前記距離推定部が推定した距離に対応する送信電力の強度よりも所定の値だけ低いレベルの強度を設定し、かつ前記送信電力制御部は、前記送信電力決定部が設定した前記所定の値だけ低いレベルの送信電力の強度の値から徐々に送出電力の強度を上げていくことを特徴とする。 The transmission power determination unit, said distance than the strength of transmission power estimating unit corresponds to the distance estimated by setting the low level intensity of a predetermined value, and the transmission power control unit, the transmission power determining unit is wherein the gradually increasing the intensity of the delivered power from the set value of the intensity of the transmission power of said predetermined value only low levels.

前記送信電力制御部は、前記リンク確立完了を以って設定した送信電力の強度にある所定の余裕(即ち所定の増強)を与えた送信電力の強度を用いてデータ通信を行うことを特徴とする。 The transmission power control unit includes a means performs data communication using the intensity of the transmission power given a certain margin (i.e. predetermined enhancement) in the intensity of the transmission power set drives out the link establishment completion to.

本発明によれば、無線LANを構築する無線端末装置は、アクセスポイントとの無線リンク確立において判定した受信レベルをもとに送信電力の強度(レベル)を必要以上に大きくしないで済むので、低消費電力で無線LAN環境を構築することができる。 According to the present invention, the wireless terminal device to establish a wireless LAN, because it is not necessary to increase more than necessary strength of the transmission received level determined based on the power (level) in the radio link established with the access point, low it is possible to construct a wireless LAN environment in the power consumption.
さらに、送信電力の強度(レベル)に所定の余裕をもたせる場合、データ通信がより安定となるので高性能低消費電力の無線LAN環境を構築することができる。 Further, when to have a predetermined margin to the intensity of the transmission power (level), it is possible to construct a high-performance low-power wireless LAN environment because the data communication becomes more stable.
このようにして構成される無線LAN環境は、従来の固定レベルで無線信号を送出していた無線端末装置に比べて低消費電力でありコスト的にも非常に有利である。 Wireless LAN environment configured in this way, power consumption is low compared to the wireless terminal device which has sent the radio signal in a conventional fixed level cost and is also very advantageous.
特に、推定した距離よりも遠い設定(低レベルの設定)で無線リンク確立を始めることが可能であり、アクセスポイントとのリンク確立をより低い送信電力で行うことが可能となる場合がでてくる。 In particular, in distant settings than the distance estimated (low setting) it is possible to start the radio link establishment, there arises a case where it is possible to perform link establishment with the access point at a lower transmission power .

以下、図1乃至図5を参照して、本発明の一実施の形態に係る無線端末装置について説明する。 Hereinafter, with reference to FIGS. 1 to 5, a description will be given of a wireless terminal device according to an embodiment of the present invention. 図1は本実施の形態の無線端末装置11の要点(無線信号送受信系)の概略構成を示すブロック図である。 Figure 1 is a block diagram showing the schematic configuration of the main points of the wireless terminal device 11 of this embodiment (the radio signal transmission and reception system).

尚、無線端末装置11には、図3および図4にも示すように、無線信号送受信系を備えた例えばパーソナルコンピュータ等のステーション端末STA1,STA2等の他、無線信号送受信系を備えるオーディオビジュアル機器、空調機器、調理関係機器、あるいは給湯機器等の任意の端末機器が含まれるものである。 Note that the wireless terminal device 11, as shown in FIGS. 3 and 4, other stations terminal STA1, STA2 such as the example, a personal computer equipped with a radio signal transmission and reception system, audio-visual equipment comprising a radio signal transmission and reception system it is intended to include air conditioning equipment, cooking relation equipment, or any terminal device such as a hot water supply equipment.

(構成の具体例) (Specific examples of the configuration)
無線端末装置11として、例えばステーション端末STA1,STA2は、図1に示すように、二つのアンテナ101,102と、各アンテナ101,102とRF(高周波回路:Radio Frequency)13との接続を切換える二つのスイッチ103,104とを備える。 As the wireless terminal device 11, for example, the station terminal STA1, STA2, as shown in FIG. 1, the two antennas 101 and 102, each antenna 101 and 102 and RF (radio frequency circuit: Radio Frequency) two switching the connection between the 13 One of and a switch 103 and 104. 各スイッチ103,104の切換えは例えばベースバンド処理回路115が制御する。 Switching of the switches 103 and 104 controlled by the baseband processing circuit 115, for example. 一方のスイッチ103の切換えには各アンテナ101,102のうち無線信号の受信状態の良い方を選択する切換えがあり、一方のスイッチ104の切換えにはRF13内において無線信号の受信系への切換え、もしくは無線信号の送信系への切換えの何れかの切換えがある。 The switching of one of the switches 103 has switched to select whichever better reception state of the radio signal of each of the antenna 101 and 102, the switching of one of the switches 104 switch to the reception system of the radio signals in the RF13, or there are any switching of switching to the transmission system of the wireless signal.

RF13の受信系は、第1に、アクセスポイント(図3、図4参照:例えば無線LANを構築するルータ等)AP1からの無線信号(ビーコン信号)を増幅するローノイズアンプ105と、無線信号と所定のVCO(図示せず:発振器)からの発振信号とをミキシング(例えば1/2・cos(α±β)を処理する。α:無線信号、β:発振信号)してベースバンド信号を生成するミキサ106と、ベースバンド信号をフィルタリングするバンドパスフィルタ107と、ベースバンド信号を可変増幅する可変増幅器109と、増幅後のベースバンド信号と所定のVCOからの発振信号とをミキシングするミキサ110と、ミキシング後のベースバンド信号をフィルタリングするバンドパスフィルタ111と、フィルタリング後のベースバンド信号 Receiving system of the RF13 is the first access point: a low noise amplifier 105 for amplifying the radio signal (beacon signal) from the AP1 (Fig. 3, see FIG. 4, for example a router or the like to construct a wireless LAN), a wireless signal and a predetermined the VCO: oscillation signal mixing (to handle eg 1/2 · cos (α ± β) .α: radio signals, beta: oscillation signal) from the (not shown oscillator) to generate a baseband signal a mixer 106, a bandpass filter 107 for filtering the baseband signal, a variable amplifier 109 that variable amplification of the baseband signal, a mixer 110 for mixing the baseband signal after amplification and the oscillation signal from a predetermined VCO, a band-pass filter 111 for filtering the baseband signal after the mixing, the baseband signal after filtering をA/D変換してベースバンド処理回路115に出力するADC(A/Dコンバータ)113とを備える。 The A / D converted and a ADC (A / D Converters) 113 to be output to the baseband processing circuit 115. 尚、フィルタリング後のベースバンド信号を受信したベースバンド処理回路115は、本発明の技術的思想に密接的には係りの無い所定の信号処理を行うものであり、かつステーション端末STA1,STA2の動作に資する前処理(例えば所定のビット列への変換等を含む)等を行うものでもある。 The base band processing circuit receiving the base band signal after filtering 115 are closely manner on the technical concept of the present invention has performed predetermined signal processing without relates, and the operation of the station terminal STA1, STA2 there is also one performs preprocessing (including, for example, conversion or the like to a predetermined bit sequence) that contribute to.

RF13の受信系は、第2に、バンドパスフィルタ107によりフィルタリングされたベースバンド信号の信号強度、即ち電圧値を検出するDET(ディテクタ)108と、検出された電圧値をA/D変換してベースバンド処理回路115に出力するADC(A/Dコンバータ)112とを備える。 Receiving system of the RF13 is a second signal strength of the filtered base band signal by the band-pass filter 107, that is, DET (detector) 108 for detecting the voltage value, the detected voltage value by A / D converting and a ADC (a / D Converters) 112 to be output to the baseband processing circuit 115. 尚、ベースバンド信号の電圧値を取得したベースバンド処理回路115は、詳しくは図2に示し後述する通り本発明の技術的思想に係る処理を行うものである。 Note that the baseband processing circuit 115 acquires the voltage value of the baseband signal is a detail performs processing according to the technical idea of ​​the street present invention to be described later shown in Fig.

RF13の送信系は、ベースバンド処理回路115が設定した送信電力の強度に基づく所定の出力信号をD/A変換するDAC(D/Aコンバータ)207と、ディジタルに変換後の出力信号にフィルタリングを行うバンドパスフィルタ206と、出力信号と所定のVCOからの発振信号とをミキシング(例えば1/2・cos(α±β)を処理する。α:出力信号、β:発振信号)するミキサ205と、ミキシング後の出力信号をベースバンド処理回路115の後述する処理に伴い可変増幅する可変増幅器204と、増幅後の出力信号にフィルタリングを行うバンドパスフィルタ203と、フィルタリング後の出力信号を増幅してスイッチ103,104を介しアンテナ101等から送出させるローノイズアンプ201とを備える。 Transmission system of RF13 includes a DAC (D / A converter) 207 for a predetermined output signal based on the intensity of the transmission power the baseband processing circuit 115 is set to convert D / A, the filtering output signal converted into a digital a band-pass filter 206 for mixing an oscillation signal from the output signal and a predetermined VCO (.α processes, for example 1/2 · cos (α ± β): an output signal, beta: an oscillation signal) to the mixer 205 , a variable amplifier 204 to variably amplify with the output signal after mixing the later-described processing of the baseband processing circuit 115, a bandpass filter 203 that filters the output signal after amplification, amplifies the output signal after filtering and a low noise amplifier 201 which is sent from the antenna 101 or the like via the switch 103 and 104.

一方、ベースバンド処理回路115は、図2に示すように、RF13のDET108が検出したベースバンド信号の信号強度、即ち信号電圧値のアナログ量から受信した無線信号(ビーコン信号)の電界強度を判定する電界強度判定部301と、判定された無線信号の電界強度に基づいてアクセスポイントAP1との距離を推定する距離推定部303と、推定されたアクセスポイントAP1との間の距離の値に基づいて無線信号の送信電力の強度を決定する送信電力決定部305と、決定された送信電力の強度を例えば該強度より若干低い低レベルから徐々に高レベルの方向に上げていくべくRF13の送信系の可変増幅器204を制御する送信電力制御部307とを備える。 On the other hand, the baseband processing circuit 115, as shown in FIG. 2, determining the field strength of the radio signal (beacon signal) received from the analog quantity of DET108 signal strength of the baseband signal detected, i.e. the signal voltage value of the RF13 and the electric field intensity judgment unit 301, a distance estimation unit 303 estimates the distance between the access point AP1 on the basis of the field intensity of the determined radio signal, based on the value of the distance between the access point AP1 estimated a transmission power determination unit 305 which determines the intensity of the transmission power of the radio signals, the determined transmission power strength, for example, the transmission system of the RF13 to gradually increase the high level direction from the slightly lower low than said intensity and a transmission power control unit 307 for controlling the variable amplifier 204. これらはハードウエアで構成しても良く、あるいはソフトウエアで構成しても良い。 These may be composed of may be implemented in hardware, or software. これらの動作タイミングは例えばCPU(図示せず:中央演算処理装置)で制御する態様がある。 These operation timing example, a CPU (not shown: a central processing unit) there is a mode to control.

即ち、送信電力制御部307は、ステーション端末STA1等とアクセスポイントAP1との間で会話的に無線信号を送受信して無線LANのリンクを確立する際に、アクセスポイントAP1からリンク確立完了を示す信号(例えば応答を示すレスポンス信号やアクノレジー信号等)を受信した時点の前記送信電力の強度を検出し、以後、基本的には、該送出電力の強度を用いてアクセスポイントAP1を中継するデータ通信をRF13に対し行わせる。 That is, the transmission power control section 307, when establishing a link of the wireless LAN transmitting and receiving a conversation to radio signals between the station terminal STA1 like and the access point AP1, the signal from the access point AP1 indicates a link establishment completion (e.g. the response signal and Akunoreji signal for indicating a response) the intensity of the transmission power at the time of receiving the detects, thereafter, basically, the data communication for relaying the access point AP1 using the intensity of said transmission output power to perform for the RF13. 但し、本例では、上述の如く、送信電力制御部307は、送信電力決定部305が決定した送信電力の強度を例えば該強度より若干低い低レベルから徐々に高レベルの方向に上げていくべく可変増幅器204を制御する。 However, in this embodiment, as described above, transmission power control section 307 to gradually increase in the direction of the high-level intensity of the transmission power by the transmission power determining unit 305 to determine, for example, from a slightly lower lower levels than said intensity to control the variable amplifier 204. 送信電力の強度を徐々に高レベルに上げてゆく場合、リンク確立完了時のレベルで保ち、以後、昇圧を行わないという態様がある。 If Yuku raised gradually high strength of the transmission power, kept at the level at the time of link establishment completion, thereafter, there is a mode that does not perform the boosting.

一方、送信電力制御部307は、ベースバンド処理回路115の他の回路系等の駆動を以ってRF13の送信系に所定の出力信号を出力するタイミングに合わせて可変増幅器204を制御するものである。 On the other hand, transmission power control section 307 is for controlling the variable amplifier 204 in accordance with the other timing for outputting a predetermined output signal to the transmission system of the RF13 drives out driving circuit system such as the baseband processing circuit 115 is there. 尚、リンク確立完了後は、電界強度判定部301、距離推定部303、および送信電力決定部305を非作動の状態に維持しても良い。 Incidentally, after the link establishment completion may maintain the electric field intensity judgment unit 301, distance estimating unit 303, and a transmission power determination unit 305 in the non-actuated state.

一方、送信電力決定部305は、距離推定部303が推定した距離に対応する送信電力の強度よりも所定の値だけ低いレベルの強度を設定し、送信電力制御部307は、送信電力決定部305が設定した前記所定の値だけ低いレベルの送信電力の強度の値から徐々に送出電力の強度を上げていくべく可変増幅器204を制御するという態様(態様2)も好ましい。 On the other hand, the transmission power determination unit 305, than the strength of transmission power distance estimation unit 303 corresponds to the distance estimated to set the strength of the lower level by a predetermined value, the transmission power control section 307, transmission power determination unit 305 There aspect of controlling variable amplifier 204 to gradually increase the intensity of the delivered power from the value of the intensity of the predetermined value only low levels of transmission power set (mode 2) is also preferred. この場合も、リンク確立完了時に送信電力の増強を止めるという態様がある。 Again, there is a mode that stops enhancement of transmission power at link establishment completion.

尚、送信電力制御部307は、リンク確立完了を以って設定した送信電力の強度にある所定の余裕(即ち所定の増強)を与えた送信電力の強度を用いてデータ通信を行うべく可変増幅器204を制御するという態様も好ましい。 The transmission power control unit 307, a variable in order to perform the data communication using the intensity of the transmission power given a certain margin (i.e. predetermined enhancement) in the intensity of the transmission power set drives out link establishment completion amplifier also a preferred embodiment of controlling 204. この制御の態様は、上述した態様2に適用しても良いことは勿論である。 Aspect of the control may be applied to embodiments 2 described above can, of course.

(動作の具体例) (Specific example of the operation)
無線LAN装置において、最初にステーション端末STA1等が、あるアクセスポイントAP1のBSS(ベーシックサービスセット)にリンクするためには、アクセスポイントAP1から周期的に送出されるビーコン信号を検知する必要がある。 In a wireless LAN system, the first station terminal STA1 etc., to link to the BSS of an access point AP1 (Basic Service Set), it is necessary to detect a beacon signal transmitted from the access point AP1 periodically. ビーコン信号は、ステーション端末STA1等にアクセスポイントAP1の存在を知らせると同時にそのBSS内でのID検知や認証等を行うための基準となる信号でもある。 Beacon signal is also a reference signal serving for performing ID detection and authentication, etc. within the same time the BSS when reporting the existence of the access point AP1 to the station terminal STA1 like. ビーコン信号を受信したステーション端末STA1等は、その受信したビーコン信号及びデータ等から付近にあるアクセスポイントAP1に対して認証やアソシエーション等のリンク確立を行うための無線信号を送出する。 Station terminal STA1 like received beacon signal, sends a radio signal for link establishment, such as authentication and association to the access point AP1 in the vicinity from the received beacon signals, data, and the like.

例えばステーション端末STA1等のPA(図示せず:Power Amplifier)は、送信時の出力信号を歪ませない程度に増幅してアンテナ101端等に送出するものである。 For example the station terminal STA1 like of PA (not shown: Power Amplifier) ​​are those for amplifying so as not to distort the output signal at the time of transmission is sent to the antenna 101 ends the like. PAは一般的にGaAsやInGaP等の化合物を用いた半導体素子で構成されるが、その効率は必ずしも良くなく、PAだけでも0.5W〜2W程度の電力消費が必要となる。 PA is consists of generally semiconductor device using a compound such as GaAs and InGaP, the efficiency is not always good, it is necessary to power consumption of about 0.5W~2W even only PA. PAの消費電力を低く抑えるためにはPAのバイアス信号を下げれば良いが、これは、アンテナ101端等からの送出電力を落とすことを意味し、電波の届く範囲が狭くなることに等しい。 To reduce the power consumption of the PA may be lowering the bias signal PA, which means that lowering the delivered power from the antenna 101 ends the like, equivalent to the reach of radio waves is narrow.

このように、接続性能を落とさない程度でPAの消費電力を低く抑えることができれば、例えばステーション端末STA1等のシステム全体の消費電力の大部分の電力を低く抑えることができる。 Thus, the connection if performance it is possible to reduce the power consumption of the PA to the extent that not drop, it is possible to suppress e.g. power of most power consumption of the entire system, such as the station terminal STA1 low. もし、送信相手に対して必要最小限の信号を送出できることがあらかじめわかるのであれば問題はないが、現実的には不可能である。 If it is no problem as long as seen previously can be delivered the required minimum signal to transmission partner, it is practically impossible. そこで、無線リンク確立の際の信号強度から推定して送信信号の送出電力を不必要に大きくしなければ消費電力が低く抑えられる。 Therefore, power consumption can be kept low to be increased delivery power of the transmission signal unnecessarily estimated from the signal strength when the radio link is established. 特に、アクセスポイントAP1のすぐそばにステーション端末STA1等を置いたときには送信電力を小さくしてもアクセスが可能であり低消費電力を低減することが可能であることは勿論である。 In particular, it is of course, also be accessible by reducing the transmit power it is possible to reduce the low power consumption when placing the station terminal STA1 like right next to the access point AP1.

図3に示すように、あるアクセスポイントAP1の近くでステーション端末STA1等を起動しようとするとき、ステーション端末STA1は、受信モードにして、アクセスポイントAP1から電波の届く範囲にないかを判断する。 As shown in FIG. 3, when attempting to start the station terminal STA1 like near an access point AP1, the station terminal STA1 is in the reception mode, it is determined whether there within reach from the access point AP1 radio wave. この図の場合、ステーション端末STA1は、アクセスポイントAP1からのビーコン信号が検知できるため、アクセスポイントAP1と無線リンクの確立を行おうとする。 In this Figure, the station terminals STA1, since the beacon signal from the access point AP1 can detect, and tries to establish the access point AP1 and the wireless link. このとき、ステーション端末STA1の電界強度判定部301は、アクセスポイントAP1から受信したビーコン信号からその電波強度(あるいは電界強度)を測定する。 In this case, the electric field intensity judgment unit 301 of the station terminal STA1 measures the radio field intensity (or electric field strength) from the beacon signal received from the access point AP1. この電波強度の測定は電送信号中に含まれるトレーニング信号で行うとよい。 Measurement of the radio wave intensity can be performed in the training signal contained in the electrical transmission signal. 例えばIEEE802.11aではプリアンブル信号のロングトレーニング信号で行うとOFDMの全サブチャンネルが送出されるので、より精度良くパワー検出が行える。 For example, since performed in the long training signal IEEE802.11a the preamble signal all the sub-channels of the OFDM are transmitted, it can be performed more accurately the power detector.

距離推定部803は、その電界強度の測定結果と、例えばあらかじめ用意しておいた距離を推定できる対応表(テーブル)等の距離測定手段を用いてアクセスポイントAP1までの距離を推定する。 The distance estimating unit 803 estimates the distance to the access point AP1 using the measurement result of the field strength, the distance measuring means such as a correspondence table (table) that can estimate the distance example that has been prepared in advance. この推定結果から、今度は無線リンク確立を行うため、ステーション端末STA1のベースバンド処理回路115からの信号送出が行われる。 From the estimation result, this time for carrying out a radio link establishment, the signal sent from the baseband processing circuit 115 of the station terminal STA1 is performed. このとき、アクセスポイントAP1までの距離はある程度推測できているため、ステーション端末STA1の送信電力のレベルはある程度制御できる。 At this time, the distance to the access point AP1 because it can somewhat guess, the level of the transmission power of the station terminal STA1 is some control. つまり、アクセスポイントAP1とステーション端末STA1が近ければ弱い送信電力で済むし、推定距離が遠ければその距離に対応して強い送信電力に設定する。 In other words, It suffices weak transmission power the closer the access point AP1 and the terminal STA1, if the estimated distance is farther in response to the distance is set to a strong transmission power.

しかし、推定した距離が必ずしも正しくない場合もあり得るため、送信電力制御部307は、送出電力をある程度低いレベルから徐々に大きくしていきながらアクセスポイントAP1とのリンク確立を試みる。 However, since the distance estimated obtain some cases necessarily incorrect, the transmission power control unit 307 attempts to link establishment with the access point AP1, while gradually increasing the delivered power from somewhat lower level. 送信レベルをある程度大きくしたところで、アクセスポイントAP1とのリンク確立が完了し、アクセスポイントAP1とステーション端末STA1等とのデータ通信が可能となる。 The transmission level at which increased to some extent, to complete the link established with the access point AP1, enables data communication between the access point AP1 and the terminal STA1 and the like.

このとき、ステーション端末STA1等の送出する送信電力はアクセスポイントAP1には認識できているが、図4に示すように、ステーション端末STA2の無線信号がステーション端末STA1に直接届かない場合がある(隠れ端末問題)。 In this case, although the transmission power for transmitting such station terminal STA1 is recognized in the access point AP1, as shown in FIG. 4, there is a case where the radio signal on the station terminal STA2 does not reach directly to the station terminal STA1 (hidden terminal problem). 特にステーション端末STA2の送信電圧を低いレベルにしたときはこの問題が発生しやすい。 This problem is likely to occur particularly when the transmission voltage of the station terminal STA2 to the low level. しかし、アクセスポイントAP1を使用したアクセスにおいては、アクセスポイントAP1だけがステーション端末STA1を認識できれば、送受信に問題が起こることはなく、これは、IEEE802.11規格によるところのRTS/CTS制御で解決できる。 However, in access through an access point AP1, if recognizing only the station terminal STA1 access point AP1, no problems can occur in transmission and reception, which can be solved by RTS / CTS control where by IEEE802.11 standard .

次に、図5に示すフローチャートを参照しベースバンド処理回路115の動作例について説明する。 Next, an operation example of the baseband processing circuit 115 with reference to the flowchart shown in FIG. まずステップ501においてステーション端末STA1に起動がかけられると、ステップ502においてアクセスポイントAP1からのビーコン信号が検出されたか否かを判定する。 First it determined the startup is subjected to station terminal STA1 in step 501, whether the beacon signal from the access point AP1 is detected in step 502. ビーコン信号を検出した場合、ステップ503において電界強度判定部301を起動して、その電界強度を測定する。 If it detects a beacon signal, to start the electric field intensity judgment unit 301 in step 503 and measures the field strength. 続いてステップ504において距離測定部303を起動して、その電界強度の値からアクセスポイントAP1までの距離を推定する。 Then start the distance measurement unit 303 in step 504, estimates the distance from the value of the field strength to the access point AP1. そしてステップ505において送信電力決定部305を起動して、送信信号の初期送信電力を決定する。 Then start the transmission power determining unit 305 in step 505, it determines the initial transmission power of the transmission signal.

さらにステップ506においてベースバンド処理回路115は無線リンク確立信号をRF13の送信系に送出するが、この信号が上記初期送信電力を以ってアクセスポイントAP1まで届いていれば、アクセスポイントAP1は応答を返すはずである。 Although the baseband processing circuit 115 in further step 506 sends a radio link establishment signal to the transmission system of the RF13, if the signal has reached to the access point AP1 drives out the initial transmission power, access point AP1 response it should return. このため、ステップ507においてアクセスポイントAP1から無線リンク確立の応答があるか否かを判定する。 Therefore, it is determined whether a response from the access point AP1 of the radio link established in step 507. ここで無線リンク確立の応答がないと判定した場合(No)は、ステップ508において初期送信電力に所定の増量値を加え、かつその送信電力(初期送信電力よりもやや強い送信電力)にある送信信号を送信する。 Here if it is determined that there is no response of the wireless link establishment (No), adding a predetermined increment value to the initial transmission power in step 508, and sends in its transmission power (moderately strong transmission power than the initial transmission power) to send a signal. 即ち、ここでは無線リンク確立の応答が届かなかったものとして次の無線リンク確立信号の送出タイミングを待ち送信信号を送信することになる。 That is, the transmitting the transmission signal waiting for transmission timing of the next radio link establishment signal as missed response of the wireless link establishment here. そしてステップ509において再びアクセスポイントAP1から無線リンク確立の応答があるか否かを判定する。 And judges whether there is a response from the access point AP1 of the radio link established again in step 509.

かくして、ステップ509においてアクセスポイントAP1から無線リンク確立の応答があったと判定した場合(Yes)は、ステップ506に移行して上述の処理を繰り返す。 Thus, if it is determined from the access point AP1 and a response of the radio link established in step 509 (Yes) repeats the above process proceeds to step 506. このようにしてアクセスポイントAP1からの応答があるまでステップ506からステップ509までの処理を繰り返す。 Thus the process is repeated from step 506 until there is a response from the access point AP1 to step 509. そしてステップ507においてアクセスポイントAP1から無線リンク確立の応答があったと判定した場合(Yes)は、ステップ510において送信電力決定部305および送信電力制御部307を起動して送信電力のレベルを決定し、かつ該送信電力の無線信号を送出した後、その送信電力でのデータ通信処理へと移行する。 And if it is determined from the access point AP1 and a response of the radio link established in step 507 (Yes) activates the transmission power determining unit 305 and transmission power control section 307 the level of the transmission power determined in step 510, and after transmitting the radio signal of the transmission power, the process proceeds to the data communication processing in the transmission power. 即ち、アクセスポイントAP1からの応答があったときの送信電力の強度(レベル)を使用してデータ通信が始まる。 That is, data communication is started by using the intensity (level) of the transmission power when there is a response from the access point AP1.

本実施の形態においては、無線LANを確立する際に、送信電力制御部307が、基本的にはアクセスポイントAP1からリンク確立完了を示す信号を受信した時点の送信電力の強度を用いてデータ通信を行わせるため、送信電力の強度を高い安定性および柔軟性を以って適切な強度に低く抑え、これにより安定的に消費電力を低減することができる。 In the present embodiment, when establishing a wireless LAN, a transmission power control section 307 is basically data communication using the intensity of the transmission power at the time of receiving the signal indicating the link establishment completion from the access point AP1 for causing, it kept low to the appropriate strength drives out strength high stability and flexibility of the transmission power, thereby reducing the stable power consumption.

また、一つの態様においては、送信電力決定部305が、距離推定部303が推定したアクセスポイントAP1までの距離に対応する送信電力の強度よりも所定の値だけ低いレベルの強度を設定し、かつ送信電力制御部307が、送信電力決定部305が設定した前記所定の値だけ低いレベルの送信電力の強度の値から徐々に送出電力の強度を上げていくため、送信電力の低レベル化の実現にあたって、より安定度が増すとともに、より柔軟性が向上するという利点がある。 Further, in one embodiment, the transmission power determining unit 305, than the strength of transmission power distance estimation unit 303 corresponds to the distance to the access point AP1 estimated set the low level intensity of a predetermined value, and since the transmission power control section 307, gradually increasing the intensity of the delivered power from the value of the intensity of transmission power of only low levels said predetermined value by the transmission power determination unit 305 has been set, the realization of a low level of transmission power In, along with more stability increases, the advantage of further improved flexibility.

また、一つの態様においては、送信電力制御部307は、アクセスポイントAP1とのリンク確立完了を以って設定した送信電力の強度にある所定の余裕(即ち所定の増強)を与えた送信電力の強度を用いてデータ通信を行わせるため、送信電力の低レベル化の実現にあたって、さらに安定度が増すとともに、さらに柔軟性が向上するという利点がある。 Further, in one embodiment, transmission power control section 307, a predetermined in the strength of transmission power set drives out link establishment completion of the access point AP1 margin (i.e. predetermined enhancement) of the transmission power gave for causing data communication using the strength, to realize the low level of transmission power, together with further stability increases, the advantage of further improved flexibility.

本発明の一実施の形態に係る無線端末装置の要点の構成を示すブロック図である。 It is a block diagram showing a configuration of main points of the wireless terminal device according to an embodiment of the present invention. 一実施の形態に係る無線端末装置内のベースバンド処理回路の要点の構成を示すブロック図である。 It is a block diagram showing a configuration of a main point of the baseband processing circuit in the wireless terminal device according to an embodiment. 一実施の形態に係る無線端末装置を以って無線LANを構築した場合の一例を説明する説明図である。 It is an explanatory view for explaining an example of a case of building a wireless LAN drives out radio terminal apparatus according to an embodiment. 一実施の形態に係る無線端末装置を以って無線LANを構築した場合の他の一例を説明する説明図である。 It is an explanatory view illustrating another example of a case of building a wireless LAN drives out radio terminal apparatus according to an embodiment. 一実施の形態に係る無線端末装置の動作例を示すフローチャートである。 Is a flowchart showing an operation example of the wireless terminal device according to an embodiment.

符号の説明 DESCRIPTION OF SYMBOLS

AP1 アクセスポイント 11 無線端末装置 STA1,STA2 ステーション端末 13 RF(高周波回路) AP1 access point 11 wireless terminals STA1, STA2 station terminal 13 RF (radio frequency circuit)
101,102 アンテナ 103,104 スイッチ 105,201 ローノイズアンプ 106,110,202,205 ミキサ 107,111,203,206 バンドパスフィルタ 109,204 可変増幅器 108 DET(ディテクタ) 101 Antenna 103 and 104 switches 105,201 low-noise amplifier 106,110,202,205 mixer 107,111,203,206 bandpass filter 109,204 variable amplifier 108 DET (detector)
112,113 ADC(A/Dコンバータ) 112,113 ADC (A / D converter)
115 ベースバンド処理回路 207 DAC(D/Aコンバータ) 115 baseband processing circuit 207 DAC (D / A converter)
301 電界強度判定部 303 距離推定部 305 送信電力決定部 307 送信電力制御部 301 field intensity judgment unit 303 distance determination unit 305 transmission power determination unit 307 transmission power control unit

Claims (3)

  1. アクセスポイントから受信したビーコン信号の電波強度に基づいて該アクセスポイントとの距離を推定する距離推定部と、 A distance estimation unit that estimates a distance between the access points based on the radio wave intensity of the beacon signal received from the access point,
    前記距離推定部が推定した距離に基づいて無線信号の送信電力の強度を決定する送信電力決定部と、 A transmission power determining unit for determining the intensity of the transmission power of the radio signal based on the distance the distance estimation unit is estimated,
    前記送信電力決定部が決定した送信電力の強度を低レベルから徐々に上げていく送信電力制御部とを備え、 And a transmission power controller for gradually increasing the intensity of the transmission power which the transmission power determining unit is determined from a low level,
    前記送信電力制御部は、無線LANのリンクを確立する際に、前記アクセスポイントからリンク確立完了を示す信号を受信した時点の前記送信電力の強度を検出し、以後、該送出電力の強度を用いてデータ通信を行わせることを特徴とする無線端末装置。 The transmission power control unit, when establishing a link a wireless LAN, detects the intensity of the transmission power at the time of receiving the signal indicating the link establishment completion from the access point, thereafter, using the intensity of said transmission output power the wireless terminal device, characterized in that to perform data communication Te.
  2. 前記送信電力決定部は、前記距離推定部が推定した距離に対応する送信電力の強度よりも所定の値だけ低いレベルの強度を設定し、 The transmission power determining unit sets the low level intensity of a predetermined value than the strength of transmission power corresponding to the distance the distance estimation unit is estimated,
    前記送信電力制御部は、前記送信電力決定部が設定した前記所定の値だけ低いレベルの送信電力の強度の値から徐々に送出電力の強度を上げていくことを特徴とする請求項1に記載の無線端末装置。 The transmission power control unit according to claim 1, characterized in that gradually increasing the intensity of the delivered power from the value of the intensity of the transmission power of the transmission said predetermined value only low levels of power determining unit is set of the wireless terminal device.
  3. 前記送信電力制御部は、前記リンク確立完了を以って設定した送信電力の強度にある所定の余裕(即ち所定の増強)を与えた送信電力の強度を用いてデータ通信を行うことを特徴とする請求項1または2に記載の無線端末装置。 The transmission power control unit includes a means performs data communication using the intensity of the transmission power given a certain margin (i.e. predetermined enhancement) in the intensity of the transmission power set drives out the link establishment completion the wireless terminal of claim 1 or 2.

JP2004143324A 2004-05-13 2004-05-13 Wireless terminal device Pending JP2005328231A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004143324A JP2005328231A (en) 2004-05-13 2004-05-13 Wireless terminal device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004143324A JP2005328231A (en) 2004-05-13 2004-05-13 Wireless terminal device

Publications (1)

Publication Number Publication Date
JP2005328231A true JP2005328231A (en) 2005-11-24

Family

ID=35474241

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004143324A Pending JP2005328231A (en) 2004-05-13 2004-05-13 Wireless terminal device

Country Status (1)

Country Link
JP (1) JP2005328231A (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007214920A (en) * 2006-02-09 2007-08-23 Mitsubishi Electric Corp Wireless communication system
WO2007133785A2 (en) * 2006-05-15 2007-11-22 Microsoft Corporation Services near me: discovering and connecting to available wireless services utilizing proximity discovery
KR100812534B1 (en) 2006-08-23 2008-03-12 에스케이 텔레콤주식회사 Low power rfid system and method, reader applied to the same
EP2026474A2 (en) 2007-08-14 2009-02-18 Canon Kabushiki Kaisha Communication apparatus and communication control method for transmission power control
JP2009523377A (en) * 2006-01-11 2009-06-18 クゥアルコム・インコーポレイテッドQualcomm Incorporated Communication method and apparatus for transmitting priority information via the beacon signal
JP2009225371A (en) * 2008-03-18 2009-10-01 Kenwood Corp Radio receiver, distance determining device, position determining device and radio receiving method
US7613426B2 (en) 2005-12-20 2009-11-03 Microsoft Corporation Proximity service discovery in wireless networks
US7974574B2 (en) 2007-07-25 2011-07-05 Microsoft Corporation Base station initiated proximity service discovery and connection establishment
US8046021B2 (en) 2007-07-30 2011-10-25 Canon Kabushiki Kaisha Communication system, communication apparatus, and communication method to minimize interference by transmission power control
JP2011217256A (en) * 2010-04-01 2011-10-27 Fujitsu Toshiba Mobile Communications Ltd Personal digital assistant and signal processing method
US8478300B2 (en) 2005-12-20 2013-07-02 Microsoft Corporation Proximity service discovery in wireless networks
US8559350B2 (en) 2005-12-20 2013-10-15 Microsoft Corporation Mechanism to convey discovery information in a wireless network
US8595501B2 (en) 2008-05-09 2013-11-26 Qualcomm Incorporated Network helper for authentication between a token and verifiers
US8681691B2 (en) 2007-07-25 2014-03-25 Microsoft Corporation Base station initiated proximity service discovery and connection establishment
US8811369B2 (en) 2006-01-11 2014-08-19 Qualcomm Incorporated Methods and apparatus for supporting multiple communications modes of operation
WO2015049583A1 (en) 2013-10-04 2015-04-09 Toyota Jidosha Kabushiki Kaisha Radio communication system and distance measuring method
US9105031B2 (en) 2008-02-22 2015-08-11 Microsoft Technology Licensing, Llc Authentication mechanisms for wireless networks
KR20170115520A (en) * 2015-02-02 2017-10-17 퀄컴 인코포레이티드 The method for estimating the distance between the wireless communication device

Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7613426B2 (en) 2005-12-20 2009-11-03 Microsoft Corporation Proximity service discovery in wireless networks
US8559350B2 (en) 2005-12-20 2013-10-15 Microsoft Corporation Mechanism to convey discovery information in a wireless network
US8478300B2 (en) 2005-12-20 2013-07-02 Microsoft Corporation Proximity service discovery in wireless networks
US8750868B2 (en) 2006-01-11 2014-06-10 Qualcomm Incorporated Communication methods and apparatus related to wireless terminal monitoring for and use of beacon signals
US8879519B2 (en) 2006-01-11 2014-11-04 Qualcomm Incorporated Wireless communication methods and apparatus supporting peer to peer communications
JP2009523377A (en) * 2006-01-11 2009-06-18 クゥアルコム・インコーポレイテッドQualcomm Incorporated Communication method and apparatus for transmitting priority information via the beacon signal
US8879520B2 (en) 2006-01-11 2014-11-04 Qualcomm Incorporated Wireless communication methods and apparatus supporting wireless terminal mode control signaling
US8885572B2 (en) 2006-01-11 2014-11-11 Qualcomm Incorporated Wireless communication methods and apparatus using beacon signals
US8811369B2 (en) 2006-01-11 2014-08-19 Qualcomm Incorporated Methods and apparatus for supporting multiple communications modes of operation
US8804677B2 (en) 2006-01-11 2014-08-12 Qualcomm Incorporated Methods and apparatus for establishing communications between devices with differing capabilities
US8787323B2 (en) 2006-01-11 2014-07-22 Qualcomm Incorporated Wireless communication methods and apparatus supporting synchronization
US9369943B2 (en) 2006-01-11 2016-06-14 Qualcomm Incorporated Cognitive communications
US9277481B2 (en) 2006-01-11 2016-03-01 Qualcomm Incorporated Wireless communication methods and apparatus supporting different types of wireless communciation approaches
US8774846B2 (en) 2006-01-11 2014-07-08 Qualcomm Incorporated Methods and apparatus relating to wireless terminal beacon signal generation, transmission, and/or use
US8902866B2 (en) 2006-01-11 2014-12-02 Qualcomm Incorporated Communication methods and apparatus which may be used in the absence or presence of beacon signals
US8755362B2 (en) 2006-01-11 2014-06-17 Qualcomm Incorporated Wireless communication methods and apparatus supporting paging and peer to peer communications
US8498237B2 (en) 2006-01-11 2013-07-30 Qualcomm Incorporated Methods and apparatus for communicating device capability and/or setup information
US8504099B2 (en) 2006-01-11 2013-08-06 Qualcomm Incorporated Communication methods and apparatus relating to cooperative and non-cooperative modes of operation
US8750262B2 (en) 2006-01-11 2014-06-10 Qualcomm Incorporated Communications methods and apparatus related to beacon signals some of which may communicate priority information
US8542658B2 (en) 2006-01-11 2013-09-24 Qualcomm Incorporated Support for wide area networks and local area peer-to-peer networks
US8553644B2 (en) 2006-01-11 2013-10-08 Qualcomm Incorporated Wireless communication methods and apparatus supporting different types of wireless communication approaches
US8902865B2 (en) 2006-01-11 2014-12-02 Qualcomm Incorporated Wireless communication methods and apparatus supporting multiple modes
US8902864B2 (en) 2006-01-11 2014-12-02 Qualcomm Incorporated Choosing parameters in a peer-to-peer communications system
US8750261B2 (en) 2006-01-11 2014-06-10 Qualcomm Incorporated Encoding beacon signals to provide identification in peer-to-peer communication
US8743843B2 (en) 2006-01-11 2014-06-03 Qualcomm Incorporated Methods and apparatus relating to timing and/or synchronization including the use of wireless terminals beacon signals
US8923317B2 (en) 2006-01-11 2014-12-30 Qualcomm Incorporated Wireless device discovery in a wireless peer-to-peer network
US8902860B2 (en) 2006-01-11 2014-12-02 Qualcomm Incorporated Wireless communication methods and apparatus using beacon signals
JP4740759B2 (en) * 2006-02-09 2011-08-03 三菱電機株式会社 Wireless communication system
JP2007214920A (en) * 2006-02-09 2007-08-23 Mitsubishi Electric Corp Wireless communication system
WO2007133785A3 (en) * 2006-05-15 2008-03-20 Microsoft Corp Services near me: discovering and connecting to available wireless services utilizing proximity discovery
WO2007133785A2 (en) * 2006-05-15 2007-11-22 Microsoft Corporation Services near me: discovering and connecting to available wireless services utilizing proximity discovery
KR100812534B1 (en) 2006-08-23 2008-03-12 에스케이 텔레콤주식회사 Low power rfid system and method, reader applied to the same
US9036558B2 (en) 2007-07-25 2015-05-19 Microsoft Technology Licensing, Llc Base station initiated proximity service discovery and connection establishment
US8681691B2 (en) 2007-07-25 2014-03-25 Microsoft Corporation Base station initiated proximity service discovery and connection establishment
US7974574B2 (en) 2007-07-25 2011-07-05 Microsoft Corporation Base station initiated proximity service discovery and connection establishment
US8046021B2 (en) 2007-07-30 2011-10-25 Canon Kabushiki Kaisha Communication system, communication apparatus, and communication method to minimize interference by transmission power control
CN101359940B (en) 2007-07-30 2013-07-03 佳能株式会社 Communication system, communication apparatus, and communication method
EP2026474A2 (en) 2007-08-14 2009-02-18 Canon Kabushiki Kaisha Communication apparatus and communication control method for transmission power control
CN101369833B (en) 2007-08-14 2012-08-22 佳能株式会社 A communication apparatus and a communication control method
EP2026474A3 (en) * 2007-08-14 2013-08-21 Canon Kabushiki Kaisha Communication apparatus and communication control method for transmission power control
US8081998B2 (en) 2007-08-14 2011-12-20 Canon Kabushiki Kaisha Communication apparatus and communication control method with power adjustment to avoid interference between apparatuses on first and second networks
US9105031B2 (en) 2008-02-22 2015-08-11 Microsoft Technology Licensing, Llc Authentication mechanisms for wireless networks
US9591483B2 (en) 2008-02-22 2017-03-07 Microsoft Technology Licensing, Llc Authentication mechanisms for wireless networks
JP2009225371A (en) * 2008-03-18 2009-10-01 Kenwood Corp Radio receiver, distance determining device, position determining device and radio receiving method
US8595501B2 (en) 2008-05-09 2013-11-26 Qualcomm Incorporated Network helper for authentication between a token and verifiers
JP2011217256A (en) * 2010-04-01 2011-10-27 Fujitsu Toshiba Mobile Communications Ltd Personal digital assistant and signal processing method
WO2015049583A1 (en) 2013-10-04 2015-04-09 Toyota Jidosha Kabushiki Kaisha Radio communication system and distance measuring method
US10139481B2 (en) 2013-10-04 2018-11-27 Toyota Jidosha Kabushiki Kaisha Radio communication system and distance measuring method
KR20170115520A (en) * 2015-02-02 2017-10-17 퀄컴 인코포레이티드 The method for estimating the distance between the wireless communication device
KR101894376B1 (en) * 2015-02-02 2018-09-04 퀄컴 인코포레이티드 The method for estimating the distance between the wireless communication device

Similar Documents

Publication Publication Date Title
JP5306824B2 (en) Timing and / or related methods and apparatus to synchronize including the use of beacon signals of the wireless terminal
KR101368393B1 (en) Apparatus and method of optimizing the power saving in a handset with wlan and bluetooth tm
US6990324B2 (en) Methods and apparatus for selecting between multiple carriers using a single receiver chain tuned to a single carrier
US7174165B2 (en) Integrated wireless local loop (WLL) and wireless local area network (WLAN) transceiver apparatus
AU2004319486C1 (en) Methods and apparatus for selecting between multiple carriers based on signal energy measurements
CN102640542B (en) System and method for power saving by coordinated wake-up in a wireless multi-band network
US9692459B2 (en) Using multiple frequency bands with beamforming assistance in a wireless network
US8195251B2 (en) Reducing WLAN power consumption on a mobile device utilizing a cellular radio interface
US8369800B2 (en) Methods and apparatus related to power control and/or interference management in a mixed wireless communications system
CN100508410C (en) Supporting multiple wireless protocols in a wireless device
RU2420923C2 (en) Method and device for distributed detection of spectrum for wireless communication
EP2100470B9 (en) Apparatus, system and method for managing wireless local area network service to a multi-mode portable communication device
EP1942611A2 (en) Client device characterization of other device transmissions and reporting of signal qualities to access point(s)
AU2003290783B2 (en) Wireless transmit/receive units having multiple receivers and methods
US20170208522A1 (en) Telephone with automatic switching between cellular and voip networks
EP2090133B1 (en) Apparatus, system and method for managing wireless local area network service based on a location of a multi-mode portable communication device
CN102123481B (en) And selected multi-band mobile station associated with the access point and multi-device
US8223662B2 (en) Concurrent operation in multiple wireless local area networks
US20050255878A1 (en) Mobile terminal having UWB and cellular capability
US8848677B2 (en) Method and apparatus for peer-to-peer connection using wireless local area network (LAN) in mobile communication terminal
RU2494571C2 (en) Method of detecting device functionalities and declaration thereof in wireless network
CN102781050B (en) Communication means
US9674023B2 (en) Systems for communicating using multiple frequency bands in a wireless network
US7729728B2 (en) Forced beam switching in wireless communication systems having smart antennas
US20110122780A1 (en) Graceful Wakeup Of Power Saving Communication Apparatuses

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20070416

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20090701

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20090721

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20090918

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20100106