A hierarchical resource management approach for QoS provisioning in IP-based wireless and mobile networks

This paper proposes a novel resource management approach that integrates a call admission control (CAC) mechanism to a hierarchy of QoS servers for IP-based wireless and mobile networks with the aim of avoiding per-user reservation signaling overhead and hence meeting the scalability requirements advocated for these networks. The proposed CAC uses measurements, mobility prediction based on mobile positioning system and takes into account the expected bandwidth to be used by calls handed off from neighboring cells within an estimation time window. A novel concept called virtual guard band is introduced which aims at preventing prereservation. Our scheme is compared through simulations with the fixed guard channel and other optimized dynamic reservation-based proposals present in the literature. The simulation results show that our proposal provides better performance in terms of handoff dropping probability and effective bandwidth utilization.