Date: Thursday October 17th
Time: 2:30 PM
Location Dupuis 217
Abstract
Wireless technologies leverage various schemes (e.g., scheduling, medium access control [MAC]), to enable communicating wireless terminals to share spectrum, time, and space, as needed, for exchanging data. Until recently, unlicensed spectrum has been dominated by IEEE802.11 (WiFi) technologies and others—each employing its MAC, equitably sharing the spectrum, and coexisting in heterogenous networks. However, WiFi homogeneity is likely to be challenged by 3GPP and emergent 5G technology, causing scenarios wherein careful coexistence analysis will be required. 3GPP has been exploring various schemes to operate in the unlicensed spectrum. LTE-U (LTE in Unlicensed spectrum), LAA (Licensed Assisted Spectrum) and its variations, and the future NR-U (New Radio-Unlicensed) access control schemes have each utilized various design approaches for spectrum sharing and WiFi coexistence. This presentation demonstrates the process for developing a protocol to evaluate coexistence among various wireless technologies. Site surveys, combined with laboratory testing and computer simulation, were implemented as part of the evaluation process. Developed tools are used to analyze captured data and provide a frame work for predicting the probability of coexistence. A case study of medical wireless device coexistence in a hospital environment will be presented to demonstrate the novel techniques.
Biography
Dr. Refai is the Williams Chair for Telecommunication and Networking at the University of Oklahoma School of Electrical and Computer Engineering (ECE) Telecommunication Program in Tulsa, Oklahoma (OU-Tulsa). As founder and director of the Wireless Electromagnetic Compliance and Design (WECAD) Center at OU-Tulsa, he is charged with executing WECAD’s mission for conducting basic and applied research to examine medical device coexistence with various RF wireless systems and technologies and to validate electronic and electromagnetic compatibility. Dr. Refai has published more than 210 refereed papers at national and international conferences and in journals. Serving as Principle Investigator, he has been awarded 86 grants from federal, state, and industry sponsors to investigate medical wireless coexistence, optical wireless communication, cognitive radios and networks, sensors for intelligent transportation system application, and cognitive radios/networks, as well as brain modeling. Dr. Refai has supervised the completion of 17 doctoral dissertations and 44 master’s theses.
http://research.cs.queensu.ca/calendar/Refai.pdf