Proactive methods for measurement of available bandwidth and link capacity
Department of Electrical and Computer Engineering
Master of Science
Network link capacity
With the continuous expansion of network infrastructure and deployment of applications sensitive to Quality-of-Service, network measurement plays a major role in both network planning and management. Accurate measurement of various network parameters, e.g., available bandwidth, link capacity, delay, packet loss and jitter, provides a positive impact for effective traffic engineering, Quality-of-Service (QoS) routing, optimization of end-to-end transport performance, and link capacity planning. For network measurement, there exists several proactive estimation tools based on either probe-gap model or probe-rate model that estimate path related attributes. Most of these tools that have been implemented can measure tight-link capacity (smallest available bandwidth) and/or narrow-link capacity (smallest link capacity) between a source node and destination node along a particular path. However, network measurement also has negative impacts on the cross traffic that induces extra queuing delay and packet loss for the legitimate data traffic that results in a significant intrusion and in degree of erroneous estimation. In this thesis, a combined measurement tool for measuring both available bandwidth and link capacity using a combination of probing packets and ICMP probe packets is been proposed. A study of the proposed tool is presented. The proposed schemes provide acceptable accuracy, low overhead, and avoid over-estimation.
njit-etd2008-023 (69 pages ~ 3,001 KB pdf)
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Created April 19, 2008