WSEAS Transactions on Communications
Print ISSN: 1109-2742, E-ISSN: 2224-2864
Volume 16, 2017
Advanced Wireless Congestion Control Techniques: XCP-Winf and RCP-Winf
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Abstract: TCP, the most used congestion control protocol, was developed having in consideration wired networks characteristics. The proliferation of wireless mesh networks has put in evidence some of TCP drawbacks. In such networks, TCP experiences serious performance degradation problems, due to its congestion control mechanisms. In a wireless network packet loss is not, as in a wired network, strongly correlated to congestion, but also with medium related errors. A congestion control scheme for wireless networks should be based in accurate estimation of network characteristics, namely link capacity and available bandwidth, based on end to end measurements. We describe new explicit flow control protocols for wireless mesh networks, based in XCP and RCP. We name these protocols XCP-Winf and RCP-Winf. They are supported in a new method to estimate the available bandwidth and the path capacity over a wireless network path, denoted as rt-Winf. The estimation is performed in real-time and without the need to intrusively inject packets in the network. This is accomplished by resorting to the CSMACA scheme with RTS/CTS packets to determine each node’s channel allocation. Simulations with ns-2 show that XCP-Winf and RCP-Winf outperform TCP efficiency in wireless mesh networks.
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Keywords: congestion control, available bandwidth, path capacity, measurements, performance, wireless networks
Pages: 232-254
WSEAS Transactions on Communications, ISSN / E-ISSN: 1109-2742 / 2224-2864, Volume 16, 2017, Art. #27