A Policy-Based Trust-Aware Adaptive Monitoring Scheme to enhance WiMax QoS

作者：Safa Haidar^*; Abu Shahla Farah

来源：Computer Networks, 2011, 55(10): 2465-2480.

DOI：10.1016/j.comnet.2011.04.007

• WiMax
• IEEE 802.16
• Trust
• QoS

The IEEE 802.16 standard does not define or recommend any algorithm for measuring whether a flow exceeds its maximum sustained traffic rate. However, in this standard the Service Data Units deemed to exceed the granted bandwidth may be delayed or dropped. In addition, nodes would behave maliciously by requesting more resources than their requirements just to deny other nodes from having access to the network. In this paper, we propose a Policy-Based Trust-Aware Adaptive Monitoring Scheme that can be integrated with the basic architecture of WiMax network to enhance its overall quality of service. The proposed scheme defines policies to monitor if a service flow exceeds its maximum sustained traffic rate and whether the allocated resources are significantly used or not. We then employ a trust model to define and establish a trust relationship between the different entities of the network, which allows us to detect and react to malicious behaviors. We have evaluated the performance of the proposed scheme using the network simulator NS-2 while measuring several network parameters such as throughput and delay. Simulation results which were compared with those obtained from the NDSL implementation of WiMax showed that a significant cost reduction can be obtained with the proposed scheme.

• 出版日期2011-7-14