Tran Minh Trung

Ph.D., Hanoi University of Science and Technology – School of Electronics and Communications

Protected: A distributed TDMA Multi-Channel MAC protocol for multimedia traffic over Mesh networks

Posted by trungtm on August 15, 2007

  1. Over view

    • Challenges
      • Delay over multi-hops
      • Low payload to overhead ratio for short VoIP
    • Research objectives
      • Support QoS for multimedia traffic (Video/Voice) traffic between Mesh routers
      • Reduce delay over multi-hop
      • Increase payload to overhead ratio
    • Solution approaches
      • TDMA based MAC protocol
      • Multi-channel & Multi-Interface
  2. Mesh back bone architecture

    • Mesh component
      • Mesh internet gate way (A,B), Mesh router (access point), Mesh client (Mobile, laptop, PDA)
      • Long distance communication (kms)
      • Low mesh router density
    • Mesh router configuration
      • A mesh router has 1 or more than 2 radios
      • Each radio can works on multiple channels
  3. Channel & time slots assignment

    • Time is divided in to time slots
      • Each multimedia link is allocated to a specific channel and time slots
      • Mesh router belong to multiples domain have to works on different channels
    • Mesh routers are grouped into collision domains.
      • Adjacent collision domains use different channel to better utilize channel resources
    • Time is divided in to time slots
      • Each multimedia link is allocated to a specific channel and time slots
      • Mesh router belong to multiples domain have to works on different channels
    • 2 sub-graph problems
      • Fill different color (channel) to adjacent area (collision domain)
        • Use the four color theorem
      • Assign different color (time slots) to edge in one – easy
        • Use the edge coloring

(Will be revised and updated)

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