Efficient and robust protocols for distributed control and optimization of ubiquitous wireless networks

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Multihop wireless networks, especially those requiring low-cost infrastructure, provide an economical solution for wireless broadband access in various critical civilian and military applications. In spite of active research activities related to protocol engineering for these wireless networks in the past several years, their successful practical implementations are rather limited. Therefore, more fundamental research studies that can guide the design of low-complexity and practically-implementable network protocols for these networks are strongly needed. To this end, the main goal of this proposed research is to build a unified theory for system modeling, analysis and protocol engineering that leads to developing of practical network protocols for multihop wireless networks. Specifically, we propose to consider the design of communication schemes and network protocols in all layers of the protocol stack that enables us to successfully realize these physical wireless systems. We aim to understand the performance limits in terms of maximum achievable throughput region considering realistic physical layer models and advanced communication techniques beyond simplistic pair-wise interference models considered by most existing works in the literature. We will develop cross-layer control protocols that work appropriately over different time scales. These multi-layer protocols should be able to exploit the interactions among layers to enhance network performance with minimal loss of layering modularity while they can be easily implemented in a distributed fashion. In addition, they should be efficient with respect to several key performance metrics such as throughput, delay and packet loss and robust to different forms of uncertainties (e.g., in network topology and channel state information). Finally, the proposed research will consider heterogeneous radio access technologies as well as dynamic spectrum access capability of wireless devices, which are important aspects of a future adaptive wireless system. This proposed research will contribute to produce cost-effective wireless technologies and provide HQP in the advanced wireless technology sector, which helps boost the technology transfer and economic development for our country.