Improvements in DCCP congestion control for satellite links

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Sarwar, Golam; Boreli, Roksana; Jourjon, Guillaume; Lochin, Emmanuel


2008-10-01


Conference Material


2008 International Workshop on Satellite and Space Communications (IWSSC 2008)


Toulouse, France


We propose modifications in the TCP-Friendly Rate Control (TFRC) congestion control mechanism from the Datagram Congestion Control Protocol (DCCP) intended for use with real-time traffic, which are aimed at improving its performance for long delay (primarily satellite) links. Firstly, we propose an algorithm to optimise the number of feedback messages per return trip time (RTT) rather than use the currently standard of at least one per RTT, based on the combination of the observed data rate, link delay and average packet size. We analyse the improvements achievable with both modifications in different phases of congestion control and present results from simulations with modified ns-2 DCCP and live experiments using the modified DCCP Linux kernel implementation. We demonstrate that the changes results in improved slow start performance and a reduced data loss compared to standard DCCP, while the increased overhead introduced remains acceptable.


DCCP, TFRC, transport protocol, wireless, satellite


http://www.tesa.prd.fr/iwssc08/


nicta:756


Sarwar, Golam; Boreli, Roksana; Jourjon, Guillaume; Lochin, Emmanuel. Improvements in DCCP congestion control for satellite links.[Conference Material]. 2008-10-01. <a href="http://hdl.handle.net/102.100.100/116470?index=1" target="_blank">http://hdl.handle.net/102.100.100/116470?index=1</a>



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