Explicit Congestion Control Algorithms for Time Varying Capacity Media

—Explicit congestion control (XCC) is emerging as one potential solution for overcoming limitations inherent to the current TCP algorithm, characterized by unstable throughput, high queuing delay, RTT-limited fairness and a static dynamic range that does not scale well to high bandwidth delay product networks. In XCC routers provide multi-bit feedback to sources, which in turn adapt throughput more accurately to the path bandwidth with potentially faster convergence times. Such systems however require precise knowledge of link capacity for efficient operation. In the presence of variable capacity media, e.g 802.11, such information is not entirely obvious or may be difficult to extract. We explore three possible algorithms for XCC which retain efficiency under such conditions by inferring available bandwidth from queue dynamics and test them through simulations with two relevant XCC protocols: XCP and RCP. Additionally, preliminary results from an experimental implementation based...

• Type: Journal
• Year: 2011
• Where: TMC
• Authors: Filipe Abrantes, João Taveira Araujo, Manuel Ricardo
• Keywords: Current Tcp Algorithm, Static Dynamic Range, TMC 2011, —Explicit Congestion Control