スマートアンテナを利用したアドホックネットワークMACプロトコルの特性評価 Characteristics Evaluation of a MAC Protocol Using Smart Antennas for Ad Hoc Networks

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無指向性アンテナを前提とした従来の無線アドホックネットワークMACプロトコルの空間利用効率が低い等の問題に対して著者らは,干渉の低減・空間利用効率の向上・通信距離の拡張を提供しうるスマートアンテナを利用したアドホックネットワークMACプロトコルSWAMP(Smart antennasbased Wider-range Access MAC Protocol)を提案している.本論文では計算機シミュレーションによるSWAMPの性能評価を実施し,スループット・遅延・オーバヘッド特性を明らかにする.その結果,IEEE 802.11と比較しSWAMPは約3.5倍のスループットおよび低遅延を実現し,追加したオーバヘッドがあるものの,それを上回る性能向上がなされることを示す.また,ノードの移動速度・ノード密度に対するスループット特性をそれぞれ示す.次に,SWAMPの通信失敗の原因を7つに分類して考察し,低負荷時にはアンテナの指向性制御が不正確になる問題が発生することを示す.さらに,この問題に関連するビーム幅,近隣端末位置情報の有効期間および最大再送回数がSWAMPの性能に与える影響に関してそれぞれ検討を行う.結果,負荷量・ノードの移動速度に応じてビーム幅の適応制御を行うことでさらなるSWAMPの性能向上の可能性があることを示す.To address issues of MAC protocols using omni-directional antennas, such as the low efficiency of spatial reuse, authors have proposed a MAC protocol for ad hoc networks using smart antennas called SWAMP (Smart antennas based Wider-range Access MAC Protocol). Smart antennas may offer some benefits, e.g., interference reduction, spatial reuse enhancement and the transmission range extension. This paper evaluates SWAMP through simulation studies in terms of throughput, End-to-End delay and overhead characteristics. Results show that SWAMP improves throughput and delay performance against IEEE 802.11 though it has more overhead. Also, we evaluate the effects of the mobility of nodes and node density. This paper then investigates different factors which reduce the probability of successful transmissions. SWAMP increases the communication failure due to location information staleness when offered load is low because a gap between the table information and actual location of the neighbor nodes is arisen due to the lapse of time and the mobility of nodes. This paper also examines the effects of the beamwidth and lifetime of the location information associated with location information staleness. The experimental results show that the dynamic adaptation of the beamwidth may mitigate the location information staleness and improve the overall network performance.

To address issues of MAC protocols using omni-directional antennas, such as the low efficiency of spatial reuse, authors have proposed a MAC protocol for ad hoc networks using smart antennas called SWAMP(Smart antennas based Wider-range Access MAC Protocol). Smart antennas may offer some benefits, e.g., interference reduction, spatial reuse enhancement and the transmission range extension. This paper evaluates SWAMP through simulation studies in terms of throughput, End-to-End delay and overhead characteristics. Results show that SWAMP improves throughput and delay performance against IEEE 802.11 though it has more overhead. Also, we evaluate the effects of the mobility of nodes and node density. This paper then investigates different factors which reduce the probability of successful transmissions. SWAMP increases the communication failure due to location information staleness when offered load is low because a gap between the table information and actual location of the neighbor nodes is arisen due to the lapse of time and the mobility of nodes. This paper also examines the effects of the beamwidth and lifetime of the location information associated with location information staleness. The experimental results show that the dynamic adaptation of the beamwidth may mitigate the location information staleness and improve the overall network performance.

収録刊行物

  • 情報処理学会論文誌

    情報処理学会論文誌 46(10), 2513-2522, 2005-10-15

    一般社団法人情報処理学会

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各種コード

  • NII論文ID(NAID)
    110002769899
  • NII書誌ID(NCID)
    AN00116647
  • 本文言語コード
    JPN
  • 資料種別
    Journal Article
  • ISSN
    1882-7764
  • NDL 記事登録ID
    7490680
  • NDL 雑誌分類
    ZM13(科学技術--科学技術一般--データ処理・計算機)
  • NDL 請求記号
    Z14-741
  • データ提供元
    CJP引用  NDL  NII-ELS  IPSJ 
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