Performance of Wireless LANs Based on IEEE 802.11 MAC Protocols
Abstract:
Abstract-IEEE 802.11 MAC protocol has been the standard for Wireless LANs, and also adopted in many network simulation packages for wireless multi-hop ad hoc networks. However, it is well known that, as the traffic goes up, the performance of IEEE 802.11 MAC drops dramatically in terms of delay and throughput, especially when the station approaches its saturation state. To explore the inherent problems in this protocol, it is important to characterize the probability distribution of the packet service time at the MAC layer. In this paper, by modeling the exponential backoff process as a Markov chain, we can use the signal transfer function of the generalized state transition diagram to derive the probability distribution of the MAC layer service time. We then present the discrete probability distribution for MAC layer packet service time, which is shown to accurately match the simulation data from network simulations. Finally, based on the probability model for the MAC layer service time, we are able to analyze a few performance metrics of the wireless LAN and give better explanation to the performance degradation in delay and throughput at various traffic load.
Citations
| 428 | Performance Analysis of the IEEE 802.11 Distributed Coordination Function – Bianchi - 2000 |
| 270 | Analysis of TCP Performance Over Mobile Ad Hoc Networks, in: MobiCom ’99 – Holland, Vaidya - 1999 |
| 57 | et al, ‘‘A Performance Comparison of Multi-Hop Wireless Ad Hoc Network Routing – Broch - 1998 |
| 44 | IEEE 802.11 protocol: design and performance evaluation of an adaptive backoff mechanism – Cali’, Conti, et al. - 2000 |
| 33 | Fundamentals of Queueing Theory, 3rd ed – Gross, Harris - 1998 |
| 23 | Performance Analysis of the – Foh, Zukerman - 2002 |
| 10 | et al. “Performance Comparison of Two On-demand Routing Protocols for Ad Hoc Networks – Perkins - 2001 |
| 5 | et al., “Performance of Reliable Transport Protocol over – Wu - 2002 |
| 1 | Frame alignment in a digital carrier system-a tutorial – Choi - 1990 |
