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General problems & Solutions

General problems & Solutions. Quality of Service (QoS) Standards Solutions today. General problems. Arguments of QoS Dropped packets Delay Jitter IP network Best effort delivery. General Solutions. UDP Connection-less Simple error detecting, multiplexing and demultiplexing

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General problems & Solutions

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  1. General problems & Solutions • Quality of Service (QoS) • Standards • Solutions today

  2. General problems • Arguments of QoS • Dropped packets • Delay • Jitter • IP network • Best effort delivery

  3. General Solutions • UDP • Connection-less • Simple error detecting, multiplexing and demultiplexing • Support multicast • Remove jitter from receiver • Sequence number • Timestamp • Delay playing

  4. General Solutions • Delay playing • Constant delay time • Play at q ms after the time packet is created • Value of q dues to delay and jitter • Adaptive layout delay • Adjust delay time at beginning of conversation • Compress data • Audio: PCM, MP3… • Video: MPEG1, MPEG2, MPEG4…

  5. General Solutions • Recover dropped packets at receiver • Forward error correction

  6. General Solutions • Recover dropped packets at receiver • Interleaving

  7. General Solutions • RTP (Real-time Transport Protocol) • A standardized packet format for delivering audio and video • Header has important info to improve QoS: sequence number, timestamp

  8. General Solutions • RTCP - RTP Control Protocol

  9. Standards - H.323 • One of H.3xx standards for transferring multi-media • Advantages: • Platform & application independence • Multi-points supported

  10. PSN GSTN GQOS LAN N-ISDN B-ISDN CSN V.70Terminal H.324Terminal SpeechTerminal H.322Terminal SpeechTerminal H.320Terminal H.321Terminal Standards – H.323 (cont) H.323 Terminal H.323 MCU H.323 Gatekeeper H.323 Gateway H.323 Terminal H.323 Terminal H.323 architecture with Gatekeeper, Gateway, Terminal, MCU

  11. Standards – H.323 (cont) H.323 Multimedia Applications, User Interface Data Applications Media Control Terminal Control and Management H.225.0 Call Signaling H.245 V.150 T.120 T.38 RTCP H.225.0 RAS Audio Codecs G.711 G.723.1 G.729 .. Video Codecs H.261 H.263 H.264 .. RTP UDP TCP TCP/UDP UDP TCP/UDP TCP UDP

  12. Solutions today • VCoIP (Video Conference over IP)

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