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IP Broadcasting over Unidirectional Satellite Link

IP Broadcasting over Unidirectional Satellite Link. Kanchana Kanchanasut Patcharee Basu Tippyarat Tansupasiri Internetworking Research Lab, AIT, Thailand. A time-sharing scheme for these two groups of flows. Introduction.

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IP Broadcasting over Unidirectional Satellite Link

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  1. IP Broadcasting over Unidirectional Satellite Link Kanchana Kanchanasut Patcharee Basu Tippyarat Tansupasiri Internetworking Research Lab, AIT, Thailand

  2. A time-sharing scheme for these two groups of flows Introduction • Focus on an IP broadcast environment over unidirectional satellite link • Two types of applications: • Time sensitive streaming • Massive content delivery

  3. Examples of Applications • Time sensitive: telemedicine, real-time classroom, entertainment • Content delivery: massive file transfer, cache and proxies, distribution of educational materials

  4. Technological Components • Unidirectional Satellite Link • Dynamic QoS (D-QoS) • Reliable Multicast on Unidirectional Satellite Link (RMUS) • RMUS and D-QoS

  5. Unidirectional Satellite Link • Two types of stations: • Feed station • Receivers • High bandwidth unidirectional downstream satellite link with long delay • Narrow return path

  6. UDL Receivers UDL feed Network C Network A Network B Request Unidirectional Satellite Link

  7. Dynamic QoS (D-QoS) Scheme • Dynamically reconfigure QoS settings • Active networking concept • Triggered by super user requests • Generate interruption on nodes • Two operation modes: • Differentiated Services – Class-based Queueing (CBQ) • Interruption – Priority Queue (PQ)

  8. Interruption Made by a Telesurgery Flow

  9. Reliable Multicast on Unidirectional Satellite Link (RMUS) • Reliability – error detection and retransmission • Dynamically adjust the transmission rate • make effective use of the bandwidth • congestion avoidance • Periodically send data in TMON • Amount of data transmitted in each TMON depends on the network condition TMON = TSEND + RTTUDL + TBACKOFF

  10. RMUS Data Transmission

  11. D-QoS and RMUS • Relax the interrupt condition • Based on time-sharing scheme • Interleave RMUS traffic with D-QoS TMARGIN = TMAX–T

  12. Interleaving RMUS traffic and D-QoS

  13. RMUS Data Transmitted (per TMON)

  14. Analysis • Calculate the 10 MB file transmission time • 7 Mbps Telesurgery flow • Assumptions: • Diffserv allocates 75% of link bandwidth to telesurgery flow and the rest to file transfer in the DiffServ-RMUS scheme • Each TMON is 850 msec for both schemes

  15. Transmission Time for a 10 MB File Transfer

  16. Thank You

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