Abstract:

Medium Access Control (MAC) protocol in a wireless network controls the access of wireless medium by mobile terminal, in order to achieve its fair and efficient sharing.  It plays an important role in resource management and QoS support for applications. All-IP wireless WAN is fully IP protocol-based and it is a strong candidate beyond 3G (Third Generation Wireless Network).   Ad hoc wireless network has recently been the topic of extensive research due to its ability to work properly without fixed infrastructure. This dissertation is composed of two main parts. The first part pursues a Prioritized Parallel Transmission MAC (PPTM) design for All-IP Wireless WAN.  Two stages are used and each packet is with a priority level in PPTM. In stage 1, a pre-transmission probability is calculated according to the continuous observation of the channel load for a certain period of time. In stage 2, a packet is prioritized and transmitted accordingly. It is modeled and analyzed as a prioritized queueing system with Poisson arrival traffic pattern. Its performance is also analyzed under various arrival patterns by using a NS-2-based simulator. A Dynamic-Rate-with-Collision-Avoidance (DRCA) MAC protocol, which is based on spread spectrum technology, is proposed for ad hoc wireless network in the second part of the dissertation.  In DRCA, a terminal sets the spreading factor for a packet according to the activity level of neighboring nodes. To avoid collision, the PN code id is broadcasted such that other terminals avoid using it when the packet is being transmitted.  The performance of DRCA is theoretically analyzed in a slotted, single-hop, multi-user environment. A simulator is created for the evaluation purpose. Both theoretical and simulation results show that DRCA perform much better than the existing static allocation strategies.

Committee Members:

Dr. Mengchu Zhou, Professor, ECE Dept., NJIT (Advisor)

Dr. Hongya Ge, Associate Professor, ECE Dept., NJIT

Dr. Sirin Tekinay, Associate Professor, ECE Dept., NJIT

Dr. Swades K. De, Assistant Professor, ECE Dept., NJIT

Dr. Jiacun Wang, Associate Professor, Software Engineering Dept., Monmouth Univ.