| Summary: | 碩士 === 國立臺灣大學 === 資訊管理學研究所 === 96 === In wired networks, there are several good properties for TCP transmission: exploiting available bandwidth as much as possible, providing fairness between different flows that share the same bottleneck link, and fast recovery from packet loss due to congestion. But in CSMA/CA-based wireless mesh networks, packet loss due to channel access contention, hidden terminal, and wireless link error will trigger the TCP congestion control scheme to slow down the data sending rate, thus results in low throughput performance.
In this thesis, we take spatial TDMA scheme to tackle channel access contention and hidden terminal problem in wireless mesh networks. And we also take link-layer retransmission scheme to sustain fast recovery properties. Under the proposed schemes, we analyze TCP performance in wireless mesh network in terms of the good TCP transmission properties. We want to construct a wireless environment so that one can preserve good TCP transmission properties to achieve good overall throughput performance in wireless mesh networks. Simulation results show that in a chain topology, spatial TDMA schedule (schedule B), which considering traffic demand, sustains good TCP fairness and exploits available bandwidth as much as possible. And link-layer retransmission scheme preserve properties of fast recovery of lost packets on error-prone wireless mesh networks.
|
|---|
