tailieunhanh - Báo cáo hóa học: " Research Article TCP Traffic Control Evaluation and Reduction over Wireless Networks Using Parallel Sequential Decoding Mechanism"

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 Article TCP Traffic Control Evaluation and Reduction over Wireless Networks Using Parallel Sequential Decoding Mechanism | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 52492 16 pages doi 2007 52492 Research Article TCP Traffic Control Evaluation and Reduction over Wireless Networks Using Parallel Sequential Decoding Mechanism Khalid Darabkh1 and Ramazan Aygun2 1 Electrical and Computer Engineering Department University of Alabama in Huntsville Huntsville AL 35899 USA 2 Computer Science Department University of Alabama in Huntsville Huntsville AL 35899 USA Received 12 April 2007 Accepted 9 October 2007 Recommended by Sayandev Mukherjee The assumption of TCP-based protocols that packet error lost or damaged is due to network congestion is not true for wireless networks. For wireless networks it is important to reduce the number of retransmissions to improve the effectiveness of TCP-based protocols. In this paper we consider improvement at the data link layer for systems that use stop-and-wait ARQ as in IEEE standard. We show that increasing the buffer size will not solve the actual problem and moreover it is likely to degrade the quality of delivery QoD . We firstly study a wireless router system model with a sequential convolutional decoder for error detection and correction in order to investigate QoD of flow and error control. To overcome the problems along with high packet error rate we propose a wireless router system with parallel sequential decoders. We simulate our systems and provide performance in terms of average buffer occupancy blocking probability probability of decoding failure system throughput and channel throughput. We have studied these performance metrics for different channel conditions packet arrival rates decoding time-out limits system capacities and the number of sequential decoders. Our results show that parallel sequential decoders have great impact on the system performance and increase QoD significantly. Copyright 2007 K. Darabkh and R. Aygun. This is an open access article .