On service time estimation in 802.11 wlans with heterogeneous traffic sources

Rodolfo Oliveira, Luis Bernardo, Paulo Pinto, Iordanis Koutsopoulos

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

This work presents a simple method to estimate IEEE 802.11 Distributed Coordination Function (DCF) service time. This is the total amount of time needed to transmit a given frame, which is defined as the duration from the instant a node starts the transmission, until the instant when the transmission task effectively finishes. We are motivated by the fact that IEEE 802.11 DCF does not provide time-bounded transmissions. Thus, it is important to have an estimate of the service time because most of the times a physical connection between two nodes exists, but it is misinterpreted by the upper layers due to the long waiting time to obtain a response from a node. In this case, the estimate of the service time can be used by the upper layer protocols to solve some problems caused by IEEE 802.11, such as routing failures due to timeouts or even TCP connection failures. The congestion time in IEEE 802.11 before each (re)transmission, which is due to the random access mechanism employed in the CSMA/CA, makes it more difficult for service time to be estimated. Our approach needs only local information available at each node and considers a realistic scenario where the traffic sources may have different data generation rates (heterogeneous traffic). The applied methodology is described and we present simulation results to assess its accuracy.

Original languageEnglish
Title of host publicationISWCS'08 - Proceedings of the 2008 IEEE International Symposium on Wireless Communication Systems
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages411-415
Number of pages5
ISBN (Print)9781424424894
DOIs
Publication statusPublished - 1 Dec 2008
Event2008 IEEE International Symposium on Wireless Communication Systems, ISWCS'08 - ReykjavIk, Iceland
Duration: 21 Oct 200824 Oct 2008

Conference

Conference2008 IEEE International Symposium on Wireless Communication Systems, ISWCS'08
CountryIceland
CityReykjavIk
Period21/10/0824/10/08

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