Performance evaluation of distributed co-ordination function for IEEE 802.11 wireless LAN protocol in presence of mobile and hidden terminals

S. Khurana, A. Kahol, Sandeep Gupta, P. K. Srimani

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

35 Scopus citations

Abstract

This paper investigates the performance of IEEE 802.11 wireless local area network (WLAN) protocol's Distributed Coordination Function (DCF) in the presence of mobile and hidden terminals. In order to study the joint effect of hidden terminals and user mobility on the performance of IEEE 802.11 DCF, we extend Tobagi and Kleinrock's hearing graph framework to model hidden terminals in a static environment. We derive a combined mobility and hidden terminal model using a Markov chain from the hearing graph of a given physical layout. The simple model uses two parameters: α, which controls the number of hidden terminals in the steady state, and λ, which controls the rate of mobility of each terminal. By varying the values of α and λ we can systematically generate scenario with different number of hidden terminals and different mobility rates for a particular physical layout with static obstructions. We have developed a discrete event simulator which uses the parameterized model to obtain the throughput and blocking probability behavior of an IEEE 802.11 based ad hoc network in the presence of certain static obstructions. Our simulations suggest that the IEEE 802.11 DCF protocol is robust enough to handle moderate conditions of hidden terminals and mobility, but the performance may degrade under extreme conditions. Carefully selecting protocol parameters (RTS and Fragmentation Threshold) can help improve the performance even under extreme conditions.

Original languageEnglish (US)
Title of host publicationIEEE International Workshop on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems - Proceedings
Place of PublicationPiscataway, NJ, United States
PublisherIEEE
Pages40-47
Number of pages8
StatePublished - 1999
Externally publishedYes
EventProceedings of the 1999 7th International Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems - MASCOTS '99 - College Park, MD, USA
Duration: Oct 24 1999Oct 28 1999

Other

OtherProceedings of the 1999 7th International Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems - MASCOTS '99
CityCollege Park, MD, USA
Period10/24/9910/28/99

ASJC Scopus subject areas

  • Modeling and Simulation

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