Fair Bandwidth Allocation in Diffserv Networks(Network Quality and Control)(<Special Issue>Next Generaton Mobile Communications Systems)

概要

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The Assured Forwarding (AF) service of the IETF Diffserv architecture provides a qualitative service differentiation between classes of traffic. However, different bandwidth is allocated between flows within the aggregate in AF service, when TCP flows with different Round Trip Times (RTTs) are aggregated into one AF class. This unfair situation for each TCP flow should be solved. Main reason of unfair bandwidth allocation is TCP congestion control. In this paper, we propose Fair Rate-conscious TCP (FR-TCP) to improve fairness of the bandwidth within the aggregate. FR-TCP (1) defines fairness and Fair Rate (FR) as minimum bandwidth of each aggregated flow, notifies FR to sender TCP and (3) controls TCP congestion window based on FR. We evaluate proposed FR-TCP through computer simulations with Network Simulator version 2 (ns-2). The results show that FR-TCP controls congestion window to get bandwidth according to Fair Rate and allocates fair bandwidth efficiently within the aggregate. FR-TCP controls sending rate promptly where the number of flows is dynamically changing. Even though FR-TCP and the current TCP are heterogeneous, FR-TCP showed the effectiveness.
一般社団法人情報処理学会の論文
2004-12-15