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TCP Video Streaming to Bandwidth-Limited Access Links Puneet Mehra and Avideh Zakhor Video and Image Processing Lab University of California, Berkeley

Talk Outline ,[object Object],[object Object],[object Object],[object Object],[object Object]

Goal ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Motivation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example Situation High RTT Med. RTT Low RTT Congestion Most Bandwidth!

Our Approach ,[object Object],[object Object],[object Object],[object Object],[object Object]

Target Rate Allocation Subsystem ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],T 1 User Prefs. σ T n

Flow Control System (FCS) w – TCP window RTT – Flow RTT MSS – TCP MSS

σ – Calculation Subsystem ,[object Object],[object Object],R 1 R N σ = Σ i T i T 1 = R 1 σ U W 2 W 1 Link Capacity T 2 = R 2 T 1 = R 1 T 2 ≠ R 2 T 2 = R 2

Experimental Details Invisible to Apps User Level App  easy to deploy ETH0 NIST NET Emulator BW = 960 Kbps Delay = 30 ms BWSS – Shared Library APP_1 APP_n APP_2

TCP vs BWSS Internet Experiments ,[object Object],[object Object],[object Object],TCP BWSS

BWSS Reduces Required Pre-Buffering ,[object Object]

SureStream TM Experimental Setup RUDE

RealVideo SureStream TM Internet Experiments ,[object Object],TCP TCP w/ BWSS ,[object Object],[object Object],Despite congestion, video streams at steady rate. Poor streaming quality

RealVideo SureStream TM Internet Experiments UDP TCP w/ BWSS ,[object Object],UDP SureStream unable to stream at 450KBps till after congestion Constant streaming at 450Kbps

Related Work – TCP Streaming ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Conclusions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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