A new CAC and packet scheduling scheme for mobile WiMAX networks

Abstract

ABSTRACTAs the wireless network technology evolves, IEEE 802.16 standard, also known WiMAX (Worldwide Interoperability for Microwave Access) appears as a great competitor to GSM, 3G, even IEEE802.11 networks. The coverage of this technology is expanded up to 50 km. It is claimed to provide a transmission rate up to 70 Mbps while respecting the QoS (Quality of Service) mechanism. However, the call admission control (CAC), scheduling and bandwidth allocation mechanisms were not defined and left as an open issue. In this paper, we introduce a CAC scheme and a scheduling algorithm for IEEE802.16e Mobile WIMAX. An efficient token bucket based CAC and uplink packet scheduling scheme is introduced in order to satisfy bandwidth guarantees to all service flow and delay guarantees to real time service flows. The proposed solution is practical and compatible to the IEEE 802.16 standard as it provides the QoS of different traffic classes especially best effort traffic by avoiding its starvation as is specified in major previous works. An analytical model and simulation results are developed in order to validate the proposed CAC scheme and the scheduling algorithm. By numerical results, we show that our proposed scheme is compatible to the IEEE 802.16 standard as it performs significantly the best effort traffic without violating QoS performance of other service classes.Copyright © 2013 John Wiley & Sons, Ltd.