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Bandwidth Measurement in Wireless Networks

Fulltext:


Authors:

Andreas Johnsson, Bob Melander, Mats Björkman

Research group:

Data Communication

Publication Type:

Conference/Workshop Paper

Venue:

Mediterranean Ad Hoc Networking Workshop

Abstract

For active, probing-based bandwidth measurements performed on top of the unifying IP layer, it may seem reasonable to expect the measurement problem in wireless networks to be no different than the one in wired networks. However, in networks with 802.11 wireless links we show that this is not the case. We also discuss the underlying reasons for the observed differences.We observe that the measured link capacity and available bandwidth is dependent on the probe packet size as well as on the cross-traffic intensity. We also show that the variance is much lower when we use small probe packets. All measurements as been performed in a testbed. The testbed has both wired and wireless links.The study we present has been performed using a new bandwidth measurement tool, DietTopp, that we have developed. DietTopp measures the end-to-end available bandwidth of a network path where one of the links are congested, along with the link capacity of the congested link.The technique DietTopp uses is a small modification of the TOPP measurement method. DietTopp is more lightweight in terms of computation power and bandwidth consumption. The modifications are described in the paper.

Bibtex

@inproceedings{Johnsson732,
author = {Andreas Johnsson and Bob Melander and Mats Bj{\"o}rkman},
title = {Bandwidth Measurement in Wireless Networks},
month = {June},
year = {2005},
booktitle = {Mediterranean Ad Hoc Networking Workshop},
url = {http://www.es.mdu.se/publications/732-}
}