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 language | English (US) |
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Title of host publication | IEEE International Workshop on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems - Proceedings |
Place of Publication | Piscataway, NJ, United States |
Publisher | IEEE |
Pages | 40-47 |
Number of pages | 8 |
State | Published - 1999 |
Externally published | Yes |
Event | Proceedings 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 1999 → Oct 28 1999 |
Other
Other | Proceedings of the 1999 7th International Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems - MASCOTS '99 |
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City | College Park, MD, USA |
Period | 10/24/99 → 10/28/99 |
ASJC Scopus subject areas
- Modeling and Simulation