Evaluation of a real-time flow aggregation infrastructure in multi-hop switched networks

Pao Yue-kong Library Electronic Theses Database

Evaluation of a real-time flow aggregation infrastructure in multi-hop switched networks

 

Author: Zhang, Ting
Title: Evaluation of a real-time flow aggregation infrastructure in multi-hop switched networks
Degree: M.Sc.
Year: 2011
Subject: Hong Kong Polytechnic University -- Dissertations
Computer network architectures
Department: Dept. of Computing
Pages: iii, 101 leaves : ill. ; 30 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b2426870
URI: http://theses.lib.polyu.edu.hk/handle/200/6051
Abstract: Guaranteed Rate server based aggregates (GR-aggregates) is the state-of-the-art tool for building network virtual topologies. However, it falls short of meeting the needs of hard real-time sensing/actuating applications, which have small data throughputs but demand short End-to-End (E2E) delay bound. This is because GR-aggregates assume a weight assignment scheme that couples aggregate data throughput with E2E delay bound inverse proportionally. To address this problem, in [1], Wang et al. proposed Guaranteed Delay server based aggregates (GD-aggregates), which allows a weight assignment scheme that decouples aggregate data throught from E2E delay bound. In this thesis, I built a ns-2 simulator to verify the theoretical framework proposed in [1]. I simulated networks of 16-hop diameter, and created virtual topologies with both GR-aggregates and GD-aggregates. Hard real-time sensing/actuating flows, video flows, and non-real-time IP flows are injected into the simulated networks. The resulted E2E delay statistics show that GD-aggregates achieve the goal of decoupling E2E delay from aggregate data throughput. With GD-aggregates, higher priority aggregates can achive shorter E2E delay bounds regardless of their data throughput. In contrast, GR-aggregates cannot.

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