Transcript Wireless Multimedia Delivery

Wireless Multimedia Delivery over
3G Networks
Greg Leah
 C SC 461

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
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

Frequency Division Multiple Access
(FDMA)


frequency is divided between users
each user is allocated a different carrier
frequency of the radio spectrum
Time Division Multiple Access
(TDMA)

users share the same frequency by using
alternating time slots
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
Wireless Services History

1G
 offered
analog voice only
 uses Frequency Division Multiple Access
(FDMA)
 offered data rates of approximately 9600 bps
Wireless Services History

2G
 digital

voice and digital data
digital data applications: text messaging, streaming
audio, & electronic publishing
 implemented
circuit switching technology
 uses TDMA (Time Division Multiple Access)
and CDMA (Code Division Multiple Access)
 peak data rate: 14.4 kbps
Wireless Services History
migration from 2G to 2.5G to assist
carriers with upgrading infrastructure
transition to 3G
 2.5G

 voice
and data transmission
 enhanced data rates and packet data services
 adopted packet-switching technology
 peak data rate: 115 kbps
Wireless Services History

3G
 combination
of circuit and packet switching
technologies
 high data rates in addition to voice
transmission
 able to achieve data rates between 307 kbps
to 2.4 Mbps
3G Technology
Wideband Code Division Multiple Access
(W-CDMA)
 Code Division Multiple Access 2000
(CDMA2000)
 Time Division-Synchronous Code Division
Multiple Access (TD-SCDMA)

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)
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
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

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

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
2005
 Rogers started offering live TV through
MobiTV in April 2005
3G Handsets

worldwide drive to implement 3G networks
is creating demand for more sophisticated
handsets
Panasonic 3G Handset
Nokia 3G Handset
Motorola’s Vodaphone 3G
Handsets
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

The Future: 4G
pervasive networks
 hypothetical concept where users can be
handed off using heterogeneous wireless
technologies

 e.g.
cellphone uses WiFi or WiMax when
available, then hands off to UMTS or another
cellular technology
Why I think 3G is cool

video delivery to cellphones is a huge
market
 projections

in multiple billions of dollars
mobile video conferencing is also a cool
technology
The End

questions?