Cross-Layer-Based Adaptive TCP Algorithm in 4G Packet Service LTE-Advanced Relaying Communications
Transmitting data packets under different wireless networks suffers from insufficient available bandwidth, long transmission delay and high wireless interference. The traditional TCP congestion control mechanism does not consider available bandwidth or buffer size and blindly halves the congestion window after receiving three duplicate ACKs. Thus, 1) we propose a bottleneck link identification approach to identify bottleneck link is on the shared link or access link, 2) to adjust the congestion window according to the bottleneck link location, 3) to differentiate whether packet loss is due to network congestion or wireless random loss, 4) to adjust the congestion window upon receiving adaptive modulation and coding (AMC) cross-layer messages. Numerical results demonstrate that the proposed approach significantly improves the goodput with accurate packet loss identification at different loss rates. Especially, in the case of 4% packet loss rate in wireless links, the proposed approach increases goodput up to 77.25% as compared with NewReno.
KeywordsAdaptive Modulation and Coding ARQ Congestion control Cross-layer Delay-based Loss-based TCP
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