QoS scheduling for group mobility in WiMAX

In this paper we have proposed an adaptive scheduling algorithm to suit group mobility scenarios in the mobile WiMAX. The QoS scheduling scheme aims to minimize the end-to-end delay for real-time traffic. IEEE 802.16e is a wireless broadband network standard aimed at providing robust, high data rate mobile communication. The issue of group mobility in mobile WiMAX networks has not been explored so far. With a modified IEEE 802.16e standard, it becomes possible to provide robust group mobility in battle zone or emergency operations that require centralized control. The WiMAX PHY and MAC specifications can be utilized to establish a point to multi point (PMP) mobile network topology with QoS. However, as the mobile nodes move away from the base station, they are provided with lesser bandwidth due to the inherent MCS in the MAC layer. It might starve the bandwidth of real-time traffic and cause packet dropping. In this paper we trade-off performance of non-real-time flow to minimize end-to-end delay for real-time traffic when necessary while using the excess bandwidth available to provide fair service to non-real time traffic.