STUN, TURN, ICE, SDP, SIP, WebSockets ... STUN, TURN, ICE, SDP, SIP, - PowerPoint PPT Presentation

Feb 12, 2023 •252 likes •546 views

STUN, TURN, ICE, SDP, SIP, WebSockets ... STUN, TURN, ICE, SDP, SIP, WebSockets ... This Talk AGENDA CONGESTION CONTROL 101 BULK DATA vs MEDIA FLOWS TRANSPORT Bulk data Media flows TCP for reliability

STUN, TURN, ICE, SDP, SIP, WebSockets ...
STUN, TURN, ICE, SDP, SIP, WebSockets ... This Talk
AGENDA ● ● ● ●
CONGESTION CONTROL 101 ● ● ● …
BULK DATA vs MEDIA FLOWS TRANSPORT Bulk data Media flows TCP for reliability UDP: can trade some losses for timeliness
WEBRTC STACK
Multimedia Congestion Control for RTC GOOGLE CONGESTION CONTROL ARCHITECTURE ● ● ● ● * currently
Multimedia Congestion Control for RTC CONGESTION METRIC Cannot do Can control this anything E2E
CONGESTION CONTROL IN A NUTSHELL Estimate the 1 OWDV Congestion 2 Detection Compute 3 the rate
Multimedia Congestion Control for RTC ESTIMATION ● ● ●
Multimedia Congestion Control for RTC OWDV = 0 ● ● ●
Multimedia Congestion Control for RTC OWDV ESTIMATION Inter-arrival Inter-depar. time time
Multimedia Congestion Control for RTC OWDV ESTIMATION
Multimedia Congestion Control for RTC CONGESTION DETECTION (FIST ATTEMPT) overuse normal underuse
CONGESTION CONTROL ACTUATION: REMBs ● ● ●
Multimedia Congestion Control for RTC CONGESTION DETECTION WITH A STATIC THRESHOLD: BAD NEWS Too large! Too small!
Multimedia Congestion Control for RTC SOLUTION: MAKE THE THRESHOLD ADAPTIVE ● γ γ ● γ γ
Multimedia Congestion Control for RTC ADAPTIVE THRESHOLD RESULTS: GOOD NEWS
Multimedia Congestion Control for RTC ADAPTIVE THRESHOLD RESULTS
Results SINGLE FLOW - CONSTANT CAPACITY - DIFFERENT QUEUE SIZES High link utilization Low queuing Log scale (Negligible) losses only when the queue is small (due to the “slow-start” phase)
Results GCC VS TCP - CONSTANT CAPACITY - DIFFERENT QUEUE SIZES Fair sharing Cannot perform miracles: losses and queuing due to competing TCP flow
TESTBED EXPERIMENTING WITH GCC: TESTBED ● ● ● ● NetEm tc
Tool for Diagnostic chrome://webrtc-internals
Tool for Diagnostic chrome://webrtc-internals: Dump diagnostic 3. Click here 1 Click here
Tool for Diagnostic chrome://webrtc-internals : Real-time metrics plot
CONCLUSION CONCLUSION

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