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This paper proposes an adaptive token bucket algorithm for achieving proportional sharing of bandwidth among aggregate flows in Differentiated Service (DiffServ) networks. By observing the simulation results obtained in a study of the throughput of TCP flows in a DiffServ network, the paper notes that the aggregate flow with a lower target rate occupies more bandwidth than its fair share, while the aggregate flow with a higher target rate gets less than its fair share. The proposed algorithm solves this unfairness problem by adjusting the target rate according to the edge-to-edge feedback information. This algorithm does not require any additional signaling protocol or measurement of per-flow states, since it can be implemented in a distributed manner using only two-bit feedback information carried in the TCP acknowledgement.

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Format:PDFSize:153 KB
Date:Jan 2007
Pages:5

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