To make the transmission opportunity fair, one can set the CW larger than the CW. This allows more time for the victim to finish its transmission before the invader comes in as shown in Fig. 7. The victim uses the fixed CW of 32 and the invader varies CW. As shown in the graph,the collision probability of the victim decreases with CW However the decrement in collision probability is highly dependent on the packet transmission time. The collision probability versus packet length is shown in Fig. 8.