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

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