Unbiased bandwidth estimation in communication protocols
2005 (English)In: Proceedings of the 16th IFAC World Congress, 2005, IFAC , 2005Conference paper (Refereed)
Heterogeneous communication networks with their variety of application demands, uncertain time-varying trafc load, and mixture of wired and wireless links pose several challenging problem in modeling and control. In this paper we focus on bandwidth estimation and elucidate why estimates based directly on bandwidth samples are biased. Previously, this phenomenon has been observed but not properly explained, it seems. Standard techniques for bandwidth estimation are based on measurements of inter-arrival times of packets as the bandwidth is proportional to the inverse of the nterarrival time. Two main classes of bandwidth estimators are analyzed wrt how variations in the inter-arrival times affect the estimates. It is shown that linear time-invariant ltering of instantaneous bandwidth estimates does not change the bias. In contrast to this, smoothing the inter-arrival-time samples does give a bias reduction which depends on the properties of the smoothing lter. Hence, with such approach, noise attenuation can be traded against tracking ability wrt changes in the actual bandwidth.
Place, publisher, year, edition, pages
IFAC , 2005.
Estimation, Communication Protocols, Communication Networks, TCP, Bandwidth
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-84769DOI: 10.3182/20050703-6-CZ-1902.01175ScopusID: 2-s2.0-79960701333ISBN: 008045108XISBN: 9780080451084OAI: oai:DiVA.org:kth-84769DiVA: diva2:499599
IFAC World Congress, Prague, Czech Republic
QC 201202202012-02-202012-02-132014-11-27Bibliographically approved