Improving WLAN Performance by Modifying an IEEE 802.11 Protocol

One of the limitations of the IEEE 802.11 distributed coordination function DCF protocol is its low bandwidth utilization under medium-to-high traffic loads resulting in low throughput and high packet delay. To overcome performance problems, traditional IEEE 802.11 DCF "DCF" protocol is modified to the buffer unit multiple access BUMA protocol. The BUMA protocol achieves a better system performance by introducing a temporary buffer unit at the medium access control MAC layer to accumulate multiple packets and combine them into a single packet with a header and a trailer before transmission. This paper provides an in-depth performance evaluation by simulation of BUMA for multiuser ad hoc and infrastructure networks. Results obtained show that the BUMA is more efficient than that of DCF. The BUMA protocol is simple and its algorithm software can be upgraded to 802.11 networks requiring no hardware changes. The BUMA protocol is described and simulation results are presented to verify the performance.