Secure rekeying with different MS's Velocities for MBS during Handover in IEEE 802.16e

The IEEE 802.16e-2005 forms the basis for the WiMAX solution for nomadic and mobile applications and is often referred to as mobile WiMAX. It supports optimized handover schemes with latencies less than 50 milliseconds to ensure real-time applications. More importantly, when mobile stations (MSs) frequently handover from one multicast broadcast services (MBS) group to others, this will trigger exhaustive rekeying procedures at each MBS group. Therefore, vehicles travelled at high speeds causing many unnecessary multicast group rekeying procedures. The presented paper will investigate the effect of using different MBS group cluster sizes, different MS?s velocities in different environments. The rest of paper will analyze the relation between rekeying and MS?s Velocities to ensure that Enhanced Delayed Feedback Rekeying algorithm (EDFRA) obviate most of rekeys due to member handover, while still maintains backward and forward secrecy for the MBS group.