JP2014060728A - 無線通信媒体へのアクセスを制御するための方法およびシステム - Google Patents
無線通信媒体へのアクセスを制御するための方法およびシステム Download PDFInfo
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- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2612—Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
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- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
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- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
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- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
【解決手段】サービスアクセスポイント上で、100Mbpsのスループットを満たすように最適化され得る様々な物理層インタフェースをサポートするMAC層アーキテクチャは、少なくとも1つのSRA(スケジュールされたリソース割り当て)と、少なくとも1つのMSRA(管理SRA)とを有するコンテンションフリー期間と、競合期間とを含むスーパーフレーム構造が、時間領域で定義される。SRAおよびMSRAについての情報を含むEB(拡張されたビーコン)が、伝送される。
【選択図】図37
Description
RCフレーム交換シーケンスが、主に、CFP内のIEEE802.11n期間においてSTAの間で使用されることが可能である(PCFにおいて使用されるPCにおける場合と同様に)。しかし、RCフレーム交換シーケンスは、オプションとして、PCまたはHCの機能を実施することもできるものの、いくつかの形でPCおよびHCとは異なる。最も重要な違いは、RCが、指定された時間のSRAを非APのSTAに割り当て、管理機能のために様々なタイプのMSRAも割り当てることである。
現行のIEEE802.11システムでは、パケットは、複数の宛先アドレスを有することが可能である。IEEE802.11nに関する転送は、以下の方法によって有効にされることが可能である。1)To DSフィールドとFrom DSフィールドがともに「1」ではない場合、MACヘッダの中の現在、未使用のアドレス4フィールドが、パケット転送における中間アドレスのために使用されることが可能である。
2)情報ビットマップが、宛先ノードおよび転送ノードのアドレスを示すように追加されることが可能である。転送ノードは、パケットを再び送信する。
3)パケットは、マルチキャストパケットとして示されていないが、複数の宛先アドレスを有することが可能である。その場合、アドレスフィールドの中の最初のアドレス、または最後のアドレスなどの、宛先ノードに関する、あらかじめ決められた位置が存在することが可能である。
1)DLP発見要求 QSTAが、パケットをAPに送信して、アプリケーション要件を送信することによってデバイスのMACアドレスを獲得する。
2)DLP発見応答 APが、デバイスのMACアドレスで応答する。
3)APによるDLP解体 APによるDLP解体のためのアクションフィールドを追加する。フレームには、タイマと呼ばれる情報がファイルされる。APは、QSTAが、その時間内にQAPにDLP解体メッセージを送信するものと予期する。
4)DLP測定要求 DLP測定要求に関するアクション項目値をQAP3315からQSTA3305に追加する。DLP測定要求は、QSTA3310の能力情報を含む。
5)DLP測定応答 DLP測定応答に関するアクション項目値をQSTA3305からQSTA3315に追加する。DLP測定応答は、測定情報、およびQSTA3310のMACアドレスを含む。
1.)初期アンテナ較正
この測定カテゴリでは、アンテナ較正要求−応答パケットのためのアクションフィールドが、定義される。IEEE802.11 ACKの代わりに、応答パケットが送信されることが可能である。応答パケットは、RSSI情報またはチャネル状態情報を含む。
2.)ビームステアリング測定
この測定カテゴリでは、ビームステアリング較正要求および応答パケットのためのアクションフィールドが、定義される。IEEE802.11 ACKの代わりに、応答パケットが送信されることが可能である。応答パケットは、RSSI情報またはチャネル状態情報を含む。アクションフィールドは、ビームステアリングの開始および終了の指示についてのサブフィールドを有することが可能である。これは、STAまたはAPが、ビームステアリング測定パケットの代わりに、実際のデータパケットを使用することによって実行中のビームステアリングについて他方の側に知らせることを望む場合、使用されることが可能である。
3.)タイミングオフセットメッセージ
APは、スロット付きAloha期間における伝搬遅延に起因するSTAのタイミングオフセットを測定することができる。APは、タイミングオフセット情報をSTAに送信する。タイミングオフセット情報は、STAによって、EBを基準としてSTAの時刻を調整するのに使用される。
4.)測定情報
この測定カテゴリでは、測定のためのアクションフィールドが、定義される。それらのフィールドは、RSSI、ならびに干渉測定要求および干渉測定応答を示す。それらのフィールドは、チャネルIDを有するサブフィールドを含む。
固定のフィールド
STAが、同期する別の機会を有するように、EBのタイムスタンプ(ビーコンの中のタイムスタンプと同様の)が、含められる。このタイムスタンプは、TSF(時間同期機能)タイマの値を表す。
ユーザ数を固定し、各ユーザのアプリケーションデータ率を変化させた後、目的は、システムにおける所与のユーザ数に関して、ユーザ当たりのサポートされる最大データ率が、いくらであるかを見出すことである。隠れリンクのパーセンテージは、10%、20%、または30%であるものと想定される。伝送機会は、すべてのケースで3回である。8名のユーザに関する結果が、図31および図32に示されている。
1)別の非AP局3310と直接にフレームを交換することを目指す局3305が、DLPを呼び出し、DLP要求フレーム3320AをAP3315に送信する。この要求は、速度セット、QSTA3305の能力、およびQSTA3305、3310のMACアドレスを含む。
2)QSTA3310が、BSSにおいて関連付けられており、BSSおよびQSTA3310のポリシーにおいて直接ストリームが許されている場合、AP3310は、DLP要求3320Bを受信側、STA3310に転送する。
3)STA3310が、直接ストリームを受け入れた場合、STA3310は、速度セット、QSTA3310の(拡張された)能力、およびSTA3305、3310のMACアドレスを含むDLP応答フレーム3325AをAP3315に送信する。
4)AP3315が、DLP応答3325BをQSTA3305に転送し、その後、直接リンクが確立される。
QSTA3305によるQSTA3310 MACの発見(オプション)。QSTA3305が、QSTA3310を探すことを望む場合、QSTA3305は、メッセージをQAP3315に送信する(アクションフレームに類似したメッセージ)。QAP3315が、QSTA3310を認識している場合、QAP3315は、妥当なMAC情報でQSTA3305に応答する。さもなければ、QAP3315は、失敗メッセージを送信する。以上は、DLPセットアップより前に行われる。
QSTA3305が、オープンMRAにおいて要求パケットを送信する。オープンMRAは、関連付けられたSTAによるBW要求のための競合期間である。リソース割り当て情報が、オープンMRAの後にブロードキャストで送信される。要求および応答IEは、ピアツーピア通信、およびQSTA3310のMACアドレスの追加を指定するように変更する必要がある。
ノード1が、宛先id、要求されるBW、チャネル情報、宛先までの直接ホップなどを有するメッセージをAPに送信する。APは、受信された情報に基づき、2つのSTAを互いに直接に、またはAPを介して通信させることを決定することができる。決定は、2つのノード間の信号強度、現在のネットワーク負荷、AP活動、2つのノードの能力などに基づくことが可能である。APは、要件、および何が利用可能であるかに基づき、リソース(例えば、その接続に関する、ある時間、副搬送波、またはアンテナ)を割り当てることを決定することができる。その情報は、ノード1とノード2の両方に送信され、誘導されたパケットとして送信されることが可能である。その他のノードは、それらのノードが、リソースが使用中であることを認識しているように、通知される。それらのノードは、すべてのノードへのブロードキャストによって、またはAP割り当て情報を(その情報が、すべてのノードによる使用に向けられていない場合でも)監視するよう、すべてのノードに義務付けることにより、通知される。これにより、その他のノードが、同一のリソースを使用することが防止される。
200、300 スーパーフレーム構造
205 スーパーフレーム
210 レガシービーコン
215 コンテンションフリー期間(CFP)
220 レガシー競合期間(CP)
Claims (4)
- アクセスポイント(AP)において使用する方法において、
ビーコンインターバルに対するスケジュール情報を決定するステップと、
前記ビーコンインターバルの中で、スケジュール情報の存在を示すインジケータを含むビーコンを送信するステップと
を備えることを特徴とする方法。 - 前記ビーコンインターバルは、少なくとも1つのスケジュールされたリソース割当期間および複数のチャネルアクセス期間を含むことを特徴とする請求項1に記載の方法。
- 前記複数のチャネルアクセス期間の1つの割当は、前記少なくとも1つのスケジュールされたリソース割当期間の中における要求および応答フレーム交換に基づいていることを特徴とする請求項2に記載の方法。
- 前記複数のチャネルアクセス期間は、スケジュールされたリソース割当期間またはオープンリソース割り当て期間の少なくとも1つを含むことを特徴とする請求項2に記載の方法。
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