| 講演抄録/キーワード |
| 講演名 |
2008-10-22 14:00
Network Coding Based Relay Scheme for Wireless LAN ○Suhua Tang・Hiroyuki Yomo・Mehdad N. Shirazi・Tetsuro Ueda・Ryu Miura・Sadao Obana(ATR) AN2008-37 |
| 抄録 |
(和) |
Network coding is an effective method to improve channel efficiency by reducing the number of transmissions. Most existing network coding schemes proposed for unicast transmissions focus on scheduling where paths are already established. In addition, a fixed rate within the whole network is assumed, neglecting link rate heterogeneity. In this paper we propose a network coding based pseudo bidirectional relay scheme for wireless LAN, taking link quality into account. We aim to reduce the actual transmission time under rate adaptation. We propose three techniques to realize this objective. (i) Suggesting a criterion for bidirectional relay selection, which aggregates flows to enable network coding; (ii) Handling traffic asymmetry by hybrid relay schemes; (iii) Proposing a network-coding aware MAC protocol, where positive (ACK) or negative (NAK) acknowledgements are adopted to reflect the receive status. Back-off and retransmissions are introduced to further improve reliability. Numerical results show that compared with direct transmission without relay, the proposed scheme can effectively reduce per-packet transmission time by up to 35% in Rayleigh fading environment. |
| (英) |
Network coding is an effective method to improve channel efficiency by reducing the number of transmissions. Most existing network coding schemes proposed for unicast transmissions focus on scheduling where paths are already established. In addition, a fixed rate within the whole network is assumed, neglecting link rate heterogeneity. In this paper we propose a network coding based pseudo bidirectional relay scheme for wireless LAN, taking link quality into account. We aim to reduce the actual transmission time under rate adaptation. We propose three techniques to realize this objective. (i) Suggesting a criterion for bidirectional relay selection, which aggregates flows to enable network coding; (ii) Handling traffic asymmetry by hybrid relay schemes; (iii) Proposing a network-coding aware MAC protocol, where positive (ACK) or negative (NAK) acknowledgements are adopted to reflect the receive status. Back-off and retransmissions are introduced to further improve reliability. Numerical results show that compared with direct transmission without relay, the proposed scheme can effectively reduce per-packet transmission time by up to 35% in Rayleigh fading environment. |
| キーワード |
(和) |
Network coding / relay / MAC / wireless LAN / / / / |
| (英) |
Network coding / relay / MAC / wireless LAN / / / / |
| 文献情報 |
信学技報, vol. 108, no. 251, AN2008-37, pp. 45-50, 2008年10月. |
| 資料番号 |
AN2008-37 |
| 発行日 |
2008-10-15 (AN) |
| ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します.(許諾番号:10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
| PDFダウンロード |
AN2008-37 |