Effects of Data Frame Size Distribution on Wireless Lans
The continuous need to replace cables and deploy mobile devices in the communications industry has led to very active research on the utilization of wireless networks. IEEE 802.11 WLAN is known to achieve relatively small throughput performance compared to the underlying physical layer’s transmission rate and this is as a result of large overhead information composed of medium access control header, physical layer preamble information back-off duration control frames (ACK) transmissions and even inter-frame spaces. This paper provides an overview of frame size distribution using the dual fixed frame size as a case in point and subsequently a performance evaluation in a multi-user transmission channel condition is carried out. The distribution of frame size and its effect on the throughput is also investigated. This is done through comparison of various scenarios such as fixed frame size distribution and dual-fixed frame size distribution. The dual- fixed frame size distribution case has both equality and inequality cases and both are investigated. The case of equal frames was found to have improved marginal throughput compared to the other cases. The analysis and measurement results from OPNET simulation has shown that an equal fixed frame size distribution can be efficient in optimizing useful data.