Ehsan Haghani, NJIT
Date: October 31, 2008 (Friday)
Time: 10:30am-12:00pm
Location: ECEC 202, NJIT

Abstract:

Extensive efforts have been focused on deploying broadband wireless networks. Providing mobile users with high speed network connectivity will let them run various multimedia applications on their wireless devices. In order to successfully deploy and operate broadband wireless networks, it is crucial to investigate efficient methods for supporting various services and applications in broadband wireless networks. Moreover, the existing “access-oriented” networking solutions are not able to fully address all the issues of supporting various applications with different quality of service requirements. Thus, “service-oriented” networking has been recently proposed and has gained much attention.

In this dissertation, we discuss the challenges and possible solutions for supporting multimedia applications in broadband wireless networks. We study the service requirements of different multimedia applications such as video streaming and VoIP. We propose some novel service-oriented networking solutions for supporting these applications in broadband wireless networks. We examine the performance of our solutions in WiMAX networks which are the promising technology for broadband wireless access in the near future. WiMAX networks are based on the IEEE 802.16 standards which have defined different QoS classes to support a broad range of applications with varying service requirements to mobile and stationary users.

The growth of multimedia traffic that requires special quality of service from the network will impose new constraints on network designers who should wisely allocate the limited resources to users based on their required quality of service. An efficient resource management and network design depends upon gaining accurate information about the traffic profile of user applications. In this dissertation, we first study the access level traffic profile of VoIP applications and propose a realistic distribution model for VoIP traffic. Based on our model, we propose an algorithm for resource allocation to VoIP applications in WiMAX networks. We next discuss the challenges and possible solutions for transmitting MPEG video streams over WiMAX networks. We introduce the MPEG traffic model adopted by the WiMAX Forum. Then, a cross-layer solution for enhancing the performance of WiMAX networks with respect to MPEG video streaming applications is explained. We show that the proposed solutions will improve the efficiency of VoIP applications and the quality of streaming applications over WiMAX networks. Finally, conclusions are drawn and future works are discussed.

Committee Members:

Dr. Nirwan Ansari (Advisor), Professor, ECE Department, NJIT
Dr. Doru Calin, Technical Manager, Bell Labs, Alcatel-Lucent
Dr. Roberto Rojas-Cessa, Associate Professor, ECE Department, NJIT
Dr. Yun-Qing Shi, Professor, ECE Department, NJIT
Dr. Osvaldo Simeone, Assistant Professor, ECE Department, NJIT

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Note: All MS thesis and PhD dissertation (proposal) defense are counted towards ECE791.