Publication No 36797


Proebster, M.*; Scharf, M.*; Hauger, S.*


Performance Comparison of Router Assisted Congestion Control Protocols: XCP vs. RCP




In the current Internet, network overload is prevented by the congestion control of the Transmission Control Protocol (TCP). The traditional TCP congestion control is an endtoend mechanism that suffers from some inherent shortcomings. A design alternative for the Future Internet is to use more feedback from the routers. Such router-assisted congestion control schemes can achieve a more efficient utilization of network resources and better fairness, even in environments with large bandwidth-delay products. Two promising proposals are the eXplicit Control Protocol (XCP) and the Rate Control Protocol (RCP). This paper evaluates the performance of XCP and RCP and compares them with the existing TCP congestion control. In order to verify previous work, a new simulation tool has been developed independently of the existing ns-2 code basis. This simulator is used to study the basic behavior of the algorithms and to analyze several degrees of freedom in the protocol design. Furthermore, the performance of the different approaches is compared using realistic Internet traffic scenarios. The results show that indeed both XCP and RCP efficiently utilize the link capacity without requiring packet loss. Unlike XCP, RCP improves the reactivity of data transfers by reducing the flow completion time. These results confirm previously published results and show that in particular RCP has the potential to replace TCP congestion control in the Future Internet.



Reference entry

Proebster, M.; Scharf, M.; Hauger, S.
Performance Comparison of Router Assisted Congestion Control Protocols: XCP vs. RCP
Proceedings of the 2nd International Workshop on the Evaluation of Quality of Service through Simulation in the Future Internet - Held in conjunction with SIMUTools 2009, Rome, March 2009

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Authors marked with an asterisk (*) were IKR staff members at the time the publication has been written.