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ECE 6160: Advanced Computer Networks Multimedia Networking Instructor: Dr. Xubin (Ben) He Email: [email_address] Tel: 931-372-3462 Computer Networking: A Top Down Approach Featuring the Internet , 3rd edition. Jim Kurose, Keith Ross. These slides are adapted from the notes and slides of Kurose and Ross. All material copyright 1996-2002 J.F Kurose and K.W. Ross, All Rights Reserved
Multimedia, Quality of Service: What is it? Multimedia applications: network audio and video (“continuous media”) network provides application with level of performance needed for application to function. QoS
streaming: client playout begins before all data has arrived
timing constraint for still-to-be transmitted data: in time for playout
Cost of disk storage High speed networking Video-on-demand…
Streaming Stored Multimedia: What is it? Cumulative data time 1. video recorded 2. video sent 3. video received, played out at client streaming: at this time, client playing out early part of video, while server still sending later part of video network delay
Today’s Internet multimedia applications use application-level techniques to mitigate (as best possible) effects of delay, loss But you said multimedia apps requires QoS and level of performance to be effective! ? ? ? ? ? ? ? ? ? ? ?
How should the Internet evolve to better support multimedia?
Integrated services philosophy:
Fundamental changes in Internet so that apps can reserve end-to-end bandwidth
Requires new, complex software in hosts & routers
no major changes
more bandwidth when needed
content distribution, application-layer multicast
Differentiated services philosophy:
Fewer changes to Internet infrastructure, yet provide 1st and 2nd class service.