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SUMMARY:Achieving Consistent Low Latency for Wireless Real-Time Communicat
 ions with the Shortest Control Loop - Zili Meng\, Tsinghua Unversity
DTSTART:20220818T140000Z
DTEND:20220818T150000Z
UID:TALK176612@talks.cam.ac.uk
CONTACT:Srinivasan Keshav
DESCRIPTION:Real-time communication (RTC) applications like video conferen
 cing or cloud gaming require consistent low latency to provide a seamless 
 interactive experience. However\, wireless networks including WiFi and cel
 lular\, albeit providing a satisfactory median latency\, drastically degra
 de at the tail due to frequent and substantial wireless bandwidth fluctuat
 ions. We observe that the control loop for the sending rate of RTC applica
 tions is inflated when congestion happens at the wireless access point (AP
 )\, resulting in untimely rate adaption to wireless dynamics. Existing sol
 utions\, however\, suffer from the inflated control loop and fail to quick
 ly adapt to bandwidth fluctuations. In this paper\, we propose Zhuge\, a p
 ure wireless AP based solution that reduces the control loop of RTC applic
 ations by separating congestion feedback from congested queues. We design 
 a Fortune Teller to precisely estimate per-packet wireless latency upon it
 s arrival at the wireless AP. To make Zhuge deployable at scale\, we also 
 design a Feedback Updater that translates the estimated latency to compreh
 ensible feedback messages for various protocols and immediately delivers t
 hem back to senders for rate adaption. Trace-driven and real-world evaluat
 ion shows that Zhuge reduces the ratio of large tail latency and RTC perfo
 rmance degradation by 17% to 95%.\n\nSpeaker Bio: Zili is a 3rd-year PhD s
 tudent in Tsinghua University. His current research interest focuses on re
 al-time video communications. He has published several papers in SIGCOMM /
  NSDI and received the Microsoft Research Asia PhD Fellowship\, Gold Medal
  of SIGCOMM 2018 Student Research Competition\, and two best paper awards.
 \n
LOCATION:FW11 and https://cl-cam-ac-uk.zoom.us/j/97216272378?pwd=M2diTFhMT
 nppckJtNWhFVTBKK0REZz09
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