A Self-Adaptive Bandwidth Reservation Scheme for 4G Mobile WiMAX

Many mechanisms based on bandwidth reservation have been proposed in the literature to decrease connection dropping probability for handoffs in cellular communications. The handoff events occur at a much higher rate in packet-switched 4G mobile WiMAX networks than in traditional cellular systems. In this paper, a self-adaptive bandwidth reservation schemes, which adopts a probabilistic mobility prediction model to estimate the bandwidth required in neighboring cells, is proposed to reduce the forced termination probability of multimedia handoffs in 4G mobile WiMAX networks. Via cross-layer design, it exploits 4G mobile WiMAX advantages by using the bandwidth reservation. The simulation results show that the proposed scheme can achieve superior performance than the representative bandwidth-reserving schemes in the literature when performance metrics are measured in terms of the forced termination probability for the handoffs, the call blocking probability for the new connections and bandwidth utilization.