IP Broadcasting over Unidirectional Satellite Link

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IP Broadcasting over Unidirectional Satellite Link

• Kanchana Kanchanasut
• Patcharee Basu
• Tippyarat Tansupasiri
• Internetworking Research Lab, AIT, Thailand

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Introduction

• Focus on an IP broadcast environment over
  unidirectional satellite link
• Two types of applications
• Time sensitive streaming
• Massive content delivery

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Examples of Applications

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

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Technological Components

• Unidirectional Satellite Link
• Dynamic QoS (D-QoS)
• Reliable Multicast on Unidirectional Satellite
  Link (RMUS)
• RMUS and D-QoS

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Unidirectional Satellite Link

• Two types of stations
• Feed station
• Receivers
• High bandwidth unidirectional downstream
  satellite link with long delay
• Narrow return path

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Unidirectional Satellite Link
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(No Transcript)
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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)

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Interruption Made by a Telesurgery Flow
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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
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RMUS Data Transmission
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D-QoS and RMUS

• Relax the interrupt condition
• Based on time-sharing scheme
• Interleave RMUS traffic with D-QoS

TMARGIN ?TMAX ?T
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Interleaving RMUS traffic and D-QoS
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RMUS Data Transmitted (per TMON)
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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

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Transmission Time for a 10 MB File Transfer
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Thank You