Internet Protocol Television

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Internet Protocol Television

• YOU ARE WATCHING IPTVThe Future of Television

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IPTV Background

• Digital TV service delivered using IP
• TV content received by viewer through network
  technologies
• Usually bundled with Internet services such as
  Web access and VoIP

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IPTV vs. Internet TV

• Control over delivery enables a guaranteed QoS
• Allows service provider to offer enhanced user
  experience
• Internet TV refers to transport streams sent over
  IP networks from outside the network that
  connects to user
• Internet TV provider has no control over final
  delivery
• Broadcasts on "best effort" basis
• Elementary streams over IP networks (ex YouTube)
  are NOT considered IPTV

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IPTV Delivery Methods

• Delivery as a file transfer (FTP/Bit Torrent)
• Broadcast (Live TV)
• Video on demand (VOD)
• Broadcast VOD for real-time viewing

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IPTV Broadcast

• Each feed provided unique channel number
• Establish multicast connection
• Eliminates need for all digitized channels to
  flow into homes
• Each source is input into broadcast encoder
• Packetizes the video stream
• Servers support delivery of multicast and unicast
• VOD response flows as sequence unicast datagrams

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IPTV Protocols

• Compressed using MPEG-2 or MPEG-4 codec
• Delivered via
• IP Multicast Live TV
• IP Unicast Video on Demand
• IP Multicast ? Info simultaneously sent to
  multiple computers
• Live TV IGMP connecting to multicast stream and
  changing from one multicast stream to another
• VOD Real Time Streaming Protocol (RTSP)

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IPTV Underlying Protocols

• Real-time Transport Protocol (RTP)
• Defines standardized packet format
• Real-Time Transport Control Protocol (RTCP)
• Provides info about participants in ongoing
  session
• Mechanism to monitor the quality of service
• Operates via periodic transmission control
  packets

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IPTV Transport UDP/RAW

• Video can be transported in UDP packets without
  RTP
• Transport stream referred to as UDP/RAW
• Error/informational conditions can be detected
• Sender changed
• Missing synchronization bytes
• Incorrect packet size
• Time-outs
• Excessive jitter
• Improper UDP bit rate

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IPTV Transport UDP/RTP

• UDP/RTP can compensate for error conditions
• UDP/RTP enables receiver to
• Determine if packet is lost
• Can compensate for the occurrence of lost packets
  
• Time stamp enables receiver to
• Perform synchronization
• Resolve jitter due to delays
• Detect several additional error conditions

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IPTV Enhanced User Experience

• Interactive program guide
• Picture-in-picture functionality
• Look up a players stats watching sports
• Change camera angle
• Access photos/music from PC on TV
• Use cell phone to schedule recording

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IPTV Benefits

• Ability to integrate TV with other IP-based
  services (ex. high speed Internet and VoIP)
• Delivery of more content and functionality
• Only content customer selects sent
• Frees up bandwidth
• Customers choice less restricted by pipe size

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IPTV Drawbacks

• Customer's privacy could be compromised
• Provides a means to hack into or disrupt (ex. DoS
  attacks) the private network
• Sensitive to packet loss
• Sensitive to delays if connection not fast enough
  
• Troublesome streaming across wireless links

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IPTV Jitter Concerns

• Problem displacement of packets
• Referred to as jitter
• Solution jitter buffer at receiver
• Memory used to compensate for delays
• Packets enter receivers jitter buffer
• Extracted at applicable times

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IPTV Screenshot
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IPTV Major Players

• BT Vision
• Internet television
• Joost
• Continuous Computing
• Microsoft Mediaroom
• NOW TV
• P2PTV
• LiveStation
• Zattoo
• IP Triple Play

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IPTV Future

• Expected to grow
• Biggest challenge is integration with core
  network
• Better manage tech already in customer's domain
• Long-term stability
• Personalized TV
• IPTV with NGN
• Next-Generation Network (NGN) network handles
  heavy traffic
• Enables content providers to deliver heavy media
  content across network
• Killer app for Next Generation Internet??

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Citations

• Marcio Nieblas Zapater, Graca Bressan, "A
  Proposed Approach for Quality of Experience
  Assurance of IPTV," icds, p. 25,  First
  International Conference on the Digital Society
  (ICDS'07),  2007
• Jay Kishigami, "The Role of QoE on IPTV Services
  style," ism, pp. 11-13,  Ninth IEEE International
  Symposium on Multimedia (ISM 2007),  2007
• Yuzo Iano, Marcus Pereira Magri, "How to
  architect an IPTV system," wiamis, p. 53,  Eight
  International Workshop on Image Analysis for
  Multimedia Interactive Services (WIAMIS '07), 
  2007
• Benjamin Alfonsi, "I Want My IPTV Internet
  Protocol Television Predicted a 'Winner,'" IEEE
  Distributed Systems Online, vol. 6, no. 2, 2005.

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