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Báo cáo hóa học: "Research Article Cross-Layer Explicit Link Status Notification to Improve TCP Performance in Wireless Networks"

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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Research Article Cross-Layer Explicit Link Status Notification to Improve TCP Performance in Wireless Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 617818 15 pages doi 10.1155 2009 617818 Research Article Cross-Layer Explicit Link Status Notification to Improve TCP Performance in Wireless Networks Ji-Hoon Yun Wireless Systems Lab. Samsung Electronics 156-777 Suwon South Korea Correspondence should be addressed to Ji-Hoon Yun ideakid@gmail.com Received 17 January 2009 Accepted 28 April 2009 Recommended by Lawrence Yeung To alleviate the performance degradation of conventional TCP in wireless networks many schemes have been proposed so far. One category of such schemes is the Explicit Loss Notification ELN scheme in which TCP senders are notified of wireless losses so as to avoid congestion control against those losses. Thus the key design factor of the ELN scheme is how to detect wireless losses accurately and rapidly. This paper proposes a new ELN scheme in which wireless losses are detected by monitoring the operation of the wireless link layer. By exploiting such cross-layer design the proposed scheme can detect wireless losses without additional transmission over the wireless link and thus achieves accurate detection with minimum delay. The proposed scheme additionally sends new information that is Explicit Retransmission Start Notification in order to prevent spurious timeouts of the TCP senders. Furthermore in order to handle packet reordering and avoid successive shrinking of a congestion window due to multiple packet drops a new TCP modification is proposed. Through intensive simulations it is demonstrated that the proposed scheme outperforms the other ELN schemes and yields the throughput performance of more than 400 of TCP-Reno and 150 of Snoop in the considered environments. Copyright 2009 Ji-Hoon Yun. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work

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