Path diversity exploits multiple routes simultaneously, achieving higher aggregated bandwidth and potentially decreasing delay and packet loss. Unfortunately, for TCP, naive load splitting often results in inaccurate estimation of round trip time (RTT) and packet reordering. As a result, it can suffer from signiﬁcant instability or even throughput reduction. This is particular severe in multi- channel Wireless Mesh Networks (WMNs), as validated by our analysis and simulation. To make multi-path TCP viable over multi-channel WMNs, we propose a novel cross-layer design with a smart trafﬁc split scheme, namely, Path Diversiﬁed Retransmission (PDR). PDR dif- ferentiates the original data packets and the retransmitted packets, and works with a novel Joint Optimization of Bandwidth and Delay multi-path routing protocol, JOBD, to distribute them sep- arately. PDR does not suffer from the RTT underestimation and extra packet reordering, which ensures stable throughput improvement over single path routing. Through extensive simulations, we further demonstrate that, as compared to state-of-the-art multi-path protocols, our PDR with JOBD noticeably enhances the TCP throughput and reduces bandwidth ﬂuctuation, with no obvious impact to fairness.
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Thesis advisor: Liu, Jiangchuan
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