How to Make Assured Service More Assured
نویسندگان
چکیده
In this paper, we study why the current assurance services (AS) architecture with pro lers/markers at edge routers and with queue management mechanisms (RIO) at core routers cannot achieve throughput assurance and fairness. Based on the ndings of the simulation study, we propose an enhanced version of the time sliding window (TSW) pro ler, called the enhanced TSW (ETSW). We also design two enhanced versions of the RIO queue management mechanism, based on rigorous, analytical reasoning, called respectively, the (r, RTT )-adaptive algorithm and the dynamic RIO (DRIO) algorithm. To validate the proposed design, we implement the proposed mechanisms, along with the 2window TCP scheme [3], the three color-marker scheme [5], and the CSFQ scheme [10], in ns-2 [11], and examine their behavior under a variety of network topologies and traÆc sources. The simulation results indicate that both DRIO and (r, RTT )-adaptive algorithms, when combined with ETSW, do ful ll better throughput assurance and fairness, especially under the case that AS ows require di erent target rates, incur di erent round trip times, or co-exist with non-responsive UDP ows.
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