Grand Challenge: Glitch Free Real-Time Communication Jin Li Research Manager/Principal Researcher Microsoft Research NITRD Workshop on Complex Engineered Networks

Bulk Tran vs. Non Real-Time Communication (RTC) Traffic  How applications use network Light weight traffic: IM, weather/calendar update Bulk transfer: software/file download, data backup, IPTV, Video on demand Real-time communication (light weight): VoIP, online gaming Real-Time Communication (heavy weight): video conferencing, tele- presence, cloud apps, virtual desktop infrastructure (VDI)  Majority of traffic on the Internet is throughput dominant bulk transfer Netflix + Youtube is 50+% Internet backbone traffic It is bulk transfer that wreaks havoc on performance of RTC traffic  Efficient Design of Network Infrastructure & API Optimize the efficiency for bulk transfer Optimize performance (delay, packet loss ratio) for real-time communication traffic

The Quest to Build a Glitch Free Real- Time Communication System  Some lessons learnt In a complex engineered network, the failure should be treated as a norm, rather than an exception Fine grain & real-time operation intelligence (OI) is critical for system performance Good OI can assist application to direct traffic routing, setting proper bandwidth usage, right amount of FEC and de-jitter buffer, UI of users Challenge to obtain fine grain & real-time OI Aggregate observations from end point (data compression) Generate OI from observation real-time (distributed computation) Real-time disseminate OI to end user