Protection and Security Aware QoS Framework for 4G Multihop Wireless Networks

Abstract

The Worldwide interoperable for Microwave Access (WiMAX) and Long Term Evolution (LTE) standards have well-defined Quality of Service (QoS) and security architecture. However, the details of Radio Resource Management (RRM) components, such as Call Admission Control (CAC) and Packet Scheduling (PS), are still open research topics. Next, some security issues are not yet resolved in the WiMAX or LTE standards. Finally, the multihop networks fail to consider the performance degradation problem during relay nodes failure. Therefore, the main objectives of this research work are to: (1) develop a new RRM framework to address QoS, (2) provide stronger security without affecting QoS performance, and (3) maintain the QoS of the network in the case of relay nodes failure. In terms of QoS, the proposed CAC in the Base Station (BS) reserves the bandwidth adaptively based on most recent requests from high priority users. When the reserved bandwidth is not fully used, the remaining bandwidth is allocated to least priority users for effective bandwidth utilization. Later, the CAC applies bandwidth pre-emption on least priority users to admit high priority users. Further, the PS scheme uses the (Priority + Earliest Due Date) scheduler to improve the multihop latency and dynamically switches to the (Priority + Token Bucket) scheduler during the CAC scheme is applied to bandwidth pre-emption on the least priority calls to ensure the bandwidth for high priority users. The proposed CAC and PS methods outperform the existing schemes where the QoS performance is verified by system level simulations. Secondly, to provide strong security without affecting the QoS performance, distributed security architecture using Elliptic Curve Diffie-Hellman protocol is proposed. For the WiMAX networks, the proposed security scheme is verified using simulation and compared with existing security using testbed implementation. For LTE networks, a theoretical analysis of the proposed scheme is analyzed.