TAILIEUCHUNG - Báo cáo hóa học: " Coherence time-based cooperative MAC protocol 1 for wireless ad hoc networks"

Coherence time-based cooperative MAC protocol 1 for wireless ad hoc networks | Khalid et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 3 http content 2011 1 3 o EURASIP Journal on Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Coherence time-based cooperative MAC protocol1 for wireless ad hoc networks 1 1 1 2 3 1 Murad Khalid Yufeng Wang Ismail Butun Hyung-jin Kim In-ho Ra and Ravi Sankar Abstract In this article we address the goal of achieving performance gains under heavy-load and fast fading conditions. CoopMACI protocol proposed in Proceedings of the IEEE International Conference on Communications ICC Seoul Korea picks either direct path or relay path based on rate comparison to enhance average throughput and delay performances. However CoopMACI performance deteriorates under fading conditions because of lower direct path or relay path reliability compared to UtdMAC Agarwal et al. LNCS 4479 415-426 2007 . UtdMAC was shown to perform better than CoopMACI in terms of average throughput and delay performances because of improved transmission reliability provided by the backup relay path. Although better than CoopMACI UtdMAC does not fully benefit from higher throughput relay path compared to the direct path since it uses relay path only as a secondary backup path. In this article we develop a cooperative MAC protocol termed as instantaneous relaybased cooperative MAC-IrcMAC that uses channel coherence time and estimates signal-to-noise ratio SNR of source-to-relay relay-to-destination and source-to-destination links to reliably choose between relay path or direct path for enhanced throughput and delay performances. Unique handshaking is used to estimate SNR and single bit feedbacks resolve contentions among relay nodes which further provides source node with rate based on SNR information on source-to-destination source-to-relay and relay-to-destination links. Simulation results clearly show that IrcMAC significantly outperforms the existing CoopMACI and .

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