Jelena Misic, from the Ryerson, Toronto, Canada
Date & time: Tuesday, November 26th, 9:00h
Location: Instituto de Telecomunicações /ISCTE - University Institute of Lisbon, Building II, 1st floor
IN THIS WORK WE DISCUSS PROXY ARCHITECTURES WHICH INTERCONNECT IOT DOMAINS RUNNING COAP WITH THE REST OF INTERNET INCLUDING MICRO DATA CENTERS AND OTHER DOMAINS BUILDING SCALABLE HIERARCHICAL ARCHITECTURES. WE ASSUME THAT COAP DOMAIN IS TERMINATED BY AN IOT PROXY WITH CACHE, AND DESCRIBE AND EVALUATE THREE DESIGN OPTIONS FOR COMMUNICATION ARCHITECTURE. THE FIRST OPTION IS THE DEFAULT SCENARIO WITH UNICAST COMMUNICATION USING POST/GET MESSAGES, WITH PROXY OPERATING IN FORWARD OR REVERSE MODE, AND REACTIVE OR
PROACTIVE DATA COLLECTION. THE SECOND OPTION IS DATA COLLECTION VIA MULTICAST GET MESSAGES FROM THE PROXY, INCLUDING THE IMPACT OF THE LEISURE PERIOD WHICH ALLOWS DEVICES TO REPLY AFTER A ARBITRARY (RANDOM) DELAY UPON RECEIVING A MULTICAST GET REQUEST. THE FINAL OPTION IS THE USE OF 'OBSERVE' FEATURE WHERE CLIENTS SUBSCRIBE TO SERVER NOTIFICATIONS THAT INFORM THEM OF CHANGED DATA VALUES. TO MAINTAIN THE FRESHNESS OF CACHED RECORDS UNDER RANDOM ARRIVALS OF OBSERVED DATA, WE HAVE IMPLEMENTED THE EVALUATION OF MAX-AGE PARAMETER AT THE PROXY. WE HAVE ALSO IMPLEMENTED CONGESTION CONTROL AT IOT NODES WHICH INTERACTS WITH PROXY'S FRESHNESS ESTIMATION AND ALLOWS THE PROXY TO PERFORM ITS OWN CONGESTION CONTROL. WE PRESENT PERFORMANCE DATA OF THESE OPTIONS, INCLUDING THE PROBABILITY OF SUCCESSFUL DATA TRANSMISSION, ROUND TRIP
DELAY AND ENERGY CONSUMPTION.
Jelena Mišić is a Professor in the Department of Computer Science at Ryerson University in Toronto, Canada, and a Fellow of IEEE. She received her PhD in Computer Engineering from University of Belgrade, Serbia, in 1993. She is an internationally recognized expert in the areas of wireless networking, Internet of Things, machine-to-machine communication, and network
security, where she has authored or co-authored four books, over 130 journal papers, 24 book chapters, and 190 conference papers, which have received more than 6000 citations according to Google Scholar. She has chaired more than a dozen major international events and guest-edited more than a dozen special issues of various journals. She serves on the editorial boards of _IEEE Transactions on Vehicular Technology_, _IEEE Network_, IEEE IoT Journal, and Elsevier _Computer Networks_ and _Ad Hoc Networks_ journals. She serves as IEEE Vehicular Technology Society distinguished lecturer for 2017-2019.