Wireless Multimedia Delivery over 3G Networks
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Transcript of Wireless Multimedia Delivery over 3G Networks
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Wireless Multimedia Delivery over 3G Networks
Greg Leah C SC 461
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3G
third generation wireless services offers high data rate content delivery to mobile
devices cellphones PDA’s
enables multimedia applications such as: live TV video/audio streaming video conferencing web surfing
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Cellular Technologies
all are different methods of sharing a radio channel
all have concept of multiple access – implies sharing available frequency range with multiple users
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Frequency Division Multiple Access (FDMA) frequency is divided between users each user is allocated a different carrier
frequency of the radio spectrum
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Time Division Multiple Access (TDMA) users share the same frequency by using
alternating time slots
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Code Division Multiple Access (CDMA) data is broken into uniquely identified packets and transmitted over
multiple frequencies uses unique codes to identify connections and reassemble
messages every user uses the entire spectrum all of the time allows most efficient usage of frequency spectrum
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Wireless Services History
1Goffered analog voice onlyuses Frequency Division Multiple Access
(FDMA)offered data rates of approximately 9600 bps
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Wireless Services History
2Gdigital voice and digital data
digital data applications: text messaging, streaming audio, & electronic publishing
implemented circuit switching technologyuses TDMA (Time Division Multiple Access)
and CDMA (Code Division Multiple Access)peak data rate: 14.4 kbps
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Wireless Services History
migration from 2G to 2.5G to assist carriers with upgrading infrastructure transition to 3G
2.5Gvoice and data transmissionenhanced data rates and packet data servicesadopted packet-switching technologypeak data rate: 115 kbps
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Wireless Services History
3Gcombination of circuit and packet switching
technologieshigh data rates in addition to voice
transmissionable to achieve data rates between 307 kbps
to 2.4 Mbps
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3G Technology
Wideband Code Division Multiple Access (W-CDMA)
Code Division Multiple Access 2000 (CDMA2000)
Time Division-Synchronous Code Division Multiple Access (TD-SCDMA)
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Wideband Code Division Multiple Access (W-CDMA) leading global 3G standard 2 sub standards based on CDMA technology:
Freedom of Mobile Multimedia Access (FOMA) world’s first commercial W-CDMA service developed in Japan by NTT DoCoMo
Universal Mobile Telephone System (UMTS) mainly used in countries that use GSM (Europe)
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CDMA2000
second generation of CDMA digital cellular technology outgrowth of 2G CDMA, but still backwards compatible substandards:
CDMA2000 1x, CDMA2000 1xEV-DO, and CDMA2000 1xEV-DV
EV-DO → Evolution-Data-Only EV-DV → Evolution-Data-Voice
main 3G technology used in Canada and the United States
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Time Division-Synchronous Code Division Multiple Access (TD-SCDMA)
uses a combination of TDMA and CDMA developed and used in China only in an
attempt to develop home-grown technology and not be "dependent on Western technology" for 3G services
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Main Challenges
developing reliable protocols to ensure high data rate transmission to mobile devices
developing protocols for pervasive networks to allow handoff between heterogeneous network types
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Implementation
content providers all over the world have been rolling out 3G networks for a couple years now
in Canada:Bell and Telus introduced 3G services in late
2005Rogers started offering live TV through
MobiTV in April 2005
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3G Handsets
worldwide drive to implement 3G networks is creating demand for more sophisticated handsets
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Panasonic 3G Handset
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Nokia 3G Handset
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Motorola’s Vodaphone 3G Handsets
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The Future: 4G
Japanese company NTT DoCoMo is testing 4G communication at 100 Mbps while moving, and 1 Gbps while stationary
plans to roll out in 2010 will be based strictly on packet-switched
technology only while 3G is a combination of packet- and circuit-switching
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The Future: 4G
pervasive networks hypothetical concept where users can be
handed off using heterogeneous wireless technologiese.g. cellphone uses WiFi or WiMax when
available, then hands off to UMTS or another cellular technology
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Why I think 3G is cool
video delivery to cellphones is a huge marketprojections in multiple billions of dollars
mobile video conferencing is also a cool technology
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The End
questions?