Protocols Supporting QoS

• Asynchronous Transfer Mode (ATM)

  • A high-speed data link layer protocol

• TCP/IP protocol suite

  • Resource Reservation Protocol (RSVP)
    • Sets up virtual circuits for general purpose real-time applications
  • Real-Time Streaming Protocol (RTSP)
    • Sets up virtual circuits for audio-video applications
  • Real-Time Transport Protocol (RTP)
    • Used after a virtual connection setup by RSVP or RTSP
    • Adds a sequence number and a timestamp for helping applications to synchronize delivery
    • Uses UDP (because of its small header) as transport

IP

RTSP

RSVP

UDP

RTP

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