TCP Performance Improvement in Wireless Mesh Networks
Date Issued
2006
Date
2006
Author(s)
Cho, Te-Chung
DOI
zh-TW
Abstract
Wireless Mesh Networks (WMNs) have become the most popular wireless access technology in wide area networks by taking the advantage of easy deployment and low cost. In wireless mesh networks, most data is transmitted by TCP. However, due to the interference between mesh nodes, performance of TCP degrades severely. Therefore we study the behavior of TCP in WMNs and propose approaches to improve TCP performance.
In this paper, we conduct extensive simulations to observe the behavior of TCP in WMNs. First, we clearly define the well-known hidden terminal problem and exposed terminal problem. Then we propose two methods to test these problems and demonstrate the TCP performance degradation caused by these problems. Based on previous analyses, we propose the non-transmission overlapping property and no-HTP subsystem. Moreover, we design the no-HTP channel assignment algorithm and the Two-Alternative-Link subsystem channel assignment algorithm to solve or alleviate hidden terminal problem and exposed terminal problem. With these two problems reduced, the TCP performance in WMNs is substantially improved.
We simulate our algorithms in various scenarios to evaluate the performance. The results show that our proposed algorithms greatly alleviate interference between nodes and outperform previous channel assignment algorithm (TowHop channel assignment algorithm) in all scenarios.
Subjects
無線網狀網路
TCP
頻道指派
隱藏終端問題
暴露終端問題
Wireless Mesh Network
channel assignment
hidden terminal problem
exposed terminal problem
Type
other
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