Performance Analysis of IEEE 802.11 MAC and Physical Layer on Saturation Throughput
B. Manikyala Rao1, P. N. S. Lakshmi2 

1B. Manikyala Rao, Assistant Professor, Department of IT, Sri Sai Madhavi Institute of Science & Technology, Rajahmundry, (A.P.), India.
2P. N. S. Lakshmi, Assistant Professor, Department of MCA, Godavari Institute of Engineering & Technology, Rajahmundry, (A.P.), India.
Manuscript received on October 01, 2011. | Revised Manuscript received on October 17, 2011. | Manuscript published on November 05, 2011. | PP: 53-56 | Volume-1 Issue-5, November 2011. | Retrieval Number: E0147081511/2011©BEIESP
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Abstract: An analytical model that accounts for the positions of stations with respect to the Access Point (AP) while evaluating the performance of 802.11 MAC layer. This paper is based on the Bianchi’s model where the performance of 802.11 MAC layer is computed using a discrete time Markov chain, but where all stations are implicitly assumed to be located at the same distance to the AP. In this model, given the position of one station, we compute its saturation throughput while conditioning on the positions of the other concurrent stations. Further, this model provides the total saturation throughput of the medium and describe the model numerically and show that the saturation throughput per station is strongly dependent not only on the station’s position but also on the positions of the other stations, and confirm that a station achieves a higher throughput when it is closer to the AP but bring out that there is a distance threshold above which the throughput decrease is fast and significant. When a station is far from the AP compared to the other stations, it will end up by contending for the bandwidth not used by the other stations. This model is a good tool to dimension 802.11 wireless access networks and to study their capacities and their performances.
Keywords: MAC Layer, Access point, throughput.