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Agenda
- Introduction
- Data bearers
- Network architecture
- Data capsulation
- Standardisation
- Conclusions
- Helsinki trial (time permitting)
IP Datacast Thomas Grenman Helsinki University of Technology - - PowerPoint PPT Presentation
IP Datacast Thomas Grenman Helsinki University of Technology - - PowerPoint PPT Presentation
IP Datacast Thomas Grenman Helsinki University of Technology Telecommunication Software and Multimedia Laboratory T-110.456 Content Networking in the Mobile Internet 26-Jan-2005 1 Agenda Introduction Data bearers Network
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Introduction
- Two initiatives for IP multicasting in a mobile
wireless environment
– IP Datacast (IPDC) – Multimedia Broadcast Multicast Service (MBMS)
- Reasons for multicasting
– receiving interesting content – receiving content simultaneously – scalability – possible higher data rates than unicast
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Data bearers (1/2)
- Possible physical broadcast-type bearers
– DVB-T, DVB-S and DVB-H (Europe) – ISDB-T (Japan) – DAB (digital radio)
- DVB-H is an optimised radio bearer for
delivering data to a handheld device
– reducing power consumption – increasing robustness – improving error correction
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Data bearers (2/2)
- DVB-H can help save battery by up to 90%
- The used technique is based on time slicing
– data is delivered in burst (~ 2Mbit) – data rates are higher than can be consumed – the receiver’s idle time becomes significant
- Neighbouring cells can be monitored during
idle times (supports handover)
- Goal: Usage times up to four hours without
recharging
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Network architecture
Service and Delivery Management System QoS-enabled backbone
- S. Dixit & T. Wu: Content Net-
working in the Mobile Internet
Service System
e e e
Content Provisioning System
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Data capsulation
- Multicasted IP packets are encapsulated
using multiprotocol encapsulation (MPE)
- MPE datagrams are carried over a MPEG-2
transport stream (TS) as private data
Payload Header
IP Packet
Payload Header Header Header Payload Payload
MPE datagram TS CRC32
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Ongoing standardisation
- DVB-H is finalised and released (by ETSI)
- DVB has issued a Call for Technologies to
start standardisation of IPDC over DVB-H
– electronic service guide – service purchase and protection – content delivery protocols – coding formats – quality of service – mobility and roaming
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IETF standards
- Streaming
– timely delivery rather than error free – real-time transport protocol (RTP)
- Filecast
– real time delivery or reliable delivery – file delivery over unidirectional transport (FLUTE)
- Service discovery
– announcing available IP multicast groups – service description protocol (SDP)
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Conclusions
- Mobile IP multicast is a promising content
delivery system
- What will the required infrastructure cost?
– UMTS vs. IPDC
- Consumer reactions
– can IPDC achieve commercial success? – are consumption habits likely to change? – what about the service categories: on-the-move, in-home, and in-office?
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Further reading
- DVB TM-CBMS
http://www.dvb.org/index.php?id=79
- IPDC Forum
http://www.ipdc-forum.org/
- ETSI standards (e.g. DVB-H)
http://pda.etsi.org/pda/
- RFC 1889 (RTP), RFC 2327 (SDP) and
RFC 3926 (FLUTE)
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Helsinki trial (1/3)
- A commercial trial is about to start
– Duration: March – June 2005 – Transmitters: Pasila, Erottaja and Roihupelto – Network coverage: Area inside Kehä I – Users: 500 (TeliaSonera and Elisa customers) – Terminal: Nokia 7710 (with additional streamer) – Pricing: Fixed monthly fee (+ordered services) – Free TV-services: TV1, MTV3, Nelonen – Free radio services: Radio Peili, X3M, Nova – Premium TV-services: CNN, Euronews, Viva+, Fashion TV, BBC World…
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Helsinki trial (2/3)
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Helsinki trial (3/3)
- Technical parameters (DVB-H)