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A New MAC for Wi-Fi based Underground Networks David Lino Porto - 1 April 2014 Context • Emergent research field • Myriad of applications: • Sports/agricultural fields • Mining facilities • Border patrol Motivation • • • • Wireless networks can be easier to mantain and deploy than cable ones Current MAC protocols don’t suit underground needs IEEE 802.11 devices are cheaper than current alternatives (IEEE 802.15.4) Focus on the U2A and A2U scenario 01/04/2014 A New MAC for Wi-Fi based Wireless Networks - David Lino Objectives • Review technologies, experiences and the fundamentals of signal propagation through soil medium • Study propagation model • Identify where it is best to alter the MAC layer • Chose and implement techniques according to priorities defined • Test changes made through Packet Delivery Ratio, Delay and Throughput • Analyze results 01/04/2014 A New MAC for Wi-Fi based Wireless Networks - David Lino Scenario 01/04/2014 A New MAC for Wi-Fi based Wireless Networks - David Lino Proposed solution • AMN sends beacon informing SN • The first node to respond is selected as the UMN • UMN broadcasts that it is available for data transfer • Every SN in its reach informs how much data it has to transfer • UMN adapts the NAV accordingly, so that transmission is in TDMA fashion. • Zero Collision [1] • As proposed in [2] • SNs transmit Data • UMN forwards Data to AMN 01/04/2014 A New MAC for Wi-Fi based Wireless Networks - David Lino Work done • State of the art • Definition of the sub-layer protocol messages • Development of packet sockets routines (in progress) References [1] M.F. Tuysuz, H.A. Mantar, G. Celik, and M.R. Celenlioglu. A novel beacon-based collisionfree channel access mechanism over ieee 802.11 wlans. pages 374–379, 2013. [2] Jiwoong Lee and Jean C. Walrand. Design and analysis of an asynchronous zero collision mac protocol. CoRR, abs/0806.3542, 2008. 01/04/2014 A New MAC for Wi-Fi based Wireless Networks - David Lino Thank you! Questions? 01/04/2014 A New MAC for Wi-Fi based Wireless Networks - David Lino
