Aamir Hasan

Title Stochastic Geometry for Modeling nodes in M2M Communications
Abstract

An ad hoc network is a collection of wireless nodes that self-configure (without help of any infrastructure) to form a network topology. Any node can potentially communicate to other nodes within its transmission range. Due to the inherent broadcast nature of the wireless channel (at the physical layer), transmissions amongst nodes have to be coordinated so as to avoid excessive interference to any ongoing receptions – at lease locally if not globally. Scheduling algorithms in ad hoc networks allow nodes to share the wireless channel so that concurrent transmissions can be decoded successfully. On one hand, scheduling needs to be efficient to maximize spatial reuse and minimize retransmissions due to collisions. But on the other hand, the scheduling algorithm needs to be easily implementable in a distributed fashion with little, if any, coordination with other nodes in the network. In the absence of multi-user detection techniques in ad hoc networks, interference management is done through MAC scheduling by creating suitable exclusion zones around active receivers. Applying MAC mechanisms alters the spatial distribution of parent contending nodes to a thinned daughter distribution. The knowledge of post-MAC geometrical distribution of nodes is important for efficient MAC implementation. The talk provides a generic model of for the thinning process, based on guard zones around active receivers, to capture the MAC implementation in ad hoc networks. Applying this model with stochastic Geometry techniques it is shown that the thinning process results in different spatial distributions that is sensitive to the robustness of the physical layer and affects both performance and implementation of mac protocols in ad hoc networks.

Bio

Dr. Hasan served in the engineering branch of Pakistan Air Force (PAF) as an Aeronautical Engineer (specialization in Avionics). He graduated with a bachelor’s degree from College of Aeronautical Engineering (CAE) at PAF Academy Risalpur in May’ 91 and an M.S. in Electrical and Computer Engineering from University of Southern California in Aug’ 02. His Ph.D. is in wireless communications from University of Texas at Austin under Professor Jeffrey G. Andrews. He has also completed Master’s in War studies and Strategic studies from PAF Air War College, Karachi. After a brief tenure as a lecturer at UT Austin, Dr. Hasan has been teaching graduate courses at Air University as a visiting faculty. His exposure to academia and industry allows students to undertake fundamental research and explore issues that are also important to Pakistan’s industry. He was awarded with Tamgha-i-Imtiaz (Military) for the design and implementation of PAF Next Generation Networks. Dr. Hasan played a key role in the establishment of an Aviation Design Institute (AvDI) at Pakistan Aeronautical Complex (PAC), Kamra for design and development of future aerial platforms. Dr. Hasan’s research is mainly focused on interference suppression techniques in wireless ad-hoc networks. His interest is in analyzing the impact of physical layer design, especially spread spectrum, on capacity of ad-hoc networks as well as its effect on MAC design. He has been using stochastic geometry tools to show that spread spectrum physical layer has a number of advantages over narrowband systems in wireless communication networks. Dr. Hasan remained associated with Habib University since the initial design phase of EE curriculum before finally joining University on 01 Jan’ 18 as an Associate Professor and Program Director (ECE)