Interaction between Ad Hoc Forwarding and The 802.11 MAC in Ad Hoc Mobile Networks using Directional Antenna
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概要
- 論文の詳細を見る
It has been shown that the use of directional antenna can largely reduce radio interference, thereby improving the utilization of wireless medium and consequently the network throughput. However, due to deafness, directional MAC performs poorly when ad hoc packets are forwarded especially in the string topology. Under the fading channel conditions, it's more difficult for each node to perceive the status of the downlink node. In this paper, a Direction and Communication-Aware MAC (DCA-MAC) scheme is proposed, able to improve the performance of the IEEE802.11 DCF(Distributed Coordination Function) from AWGN(no fading) to fading environments. Omnidirectional transmission from source node can inform its communication status to the up-link-next-hop, without disturbing the neighbors' on-going communication, by the utilization of DNAV(Directional Network Allocation Vector). In addition, the directional antenna gain is controlled adequately according to the number of hops, and keeps the stable performances under any condition. Using QualNet network simulator, we have evaluated the effectiveness of the proposed directional MAC protocol, DCA-MAC in single chain scenario, where the omnidirectional notifications to the up-link-next-hop transmissions with directional antenna gain control can contribute to the throughput improvements for the various environments.
- 社団法人電子情報通信学会の論文
- 2005-11-10
著者
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UEDA Tetsuro
ATR Adaptive Communications Research Laboratories
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OBANA Sadao
ATR Adaptive Communications Research Laboratories
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Iwai Hisato
Doshisha Univ. Kyotanabe‐shi Jpn
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IWAI Hisato
ATR Adaptive Communications Research Laboratories
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Obana Sadao
Atr Adaptive Communications Res. Lab. Keihanna Sci. City Jpn
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Ueda Tetsuro
Atr Adaptive Communications Research Laboratory Keihanna Science City
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Iwai Hisato
Atr Adaptive Communications Research Labs
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Obana Sadao
Atr Adaptive Communications Research Labs
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Obana Sadao
Atr Adaptive Communication Labs.
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UEDA Tetsuro
Advanced Telecommunications Research Institute International (ATR)
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Ueda Tetsuro
YRP Research Center, KDDI R&D Laboratories Inc.
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Sugiyama Keizo
YRP Research Center, KDDI R&D Laboratories Inc.
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Siuli Roy
Indian Institute of Management Calcutta
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Sanjay Chatterjee
Indian Institute of Management Calcutta
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Somprakash Bandyopadhyay
Indian Institute of Management Calcutta
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Ueda T
Nec Co. Kawasaki‐shi Jpn
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Roy Siuli
Indian Institute Of Management
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Sugiyama Keizo
Yrp Research Center Kddi R&d Laboratories Inc.
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Bandyopadhyay Somprakash
Indian Institute Of Management
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