3G Wireless Mike McGannon

ppt格式，8頁

Spectrum (900 and 1800 MHz)
1st Generation (1G) Analog
Wireless Cellular: Late 1970s - Early 1980s
Voice Communications
2nd Generation (2G) Digital
Personal Communications Systems (PCS): Mid 1990s PCS Auctions
“Digital Voice”
3rd Generation (3G) Data
Internet Protocol (IP) and Circuit-switched network
Data Applications, Messaging, Internet Access
Defined by FCC as:
144kbps in mobile environment,384kbps for pedestrian applications,2Mbps indoor
Interoperability and roaming
Common billing and user profiles
Positioning information to mobile and network
Support of multi-media services and capabilities2nd Generation (2G) Digital
4th Generation (4G) Entirely IP Based
25kHz Analog Channel
Frequency Division Multiple Address (FDMA) 2:1
Time Division Multiple Address (TDMA) 8:1
Code Division Multiple Address (CDMA) 25:11.25 MHz Channel
GSM - Largest Numbers of Worldwide Users (in excess of 1 Billion)
TDMA Technology
9600 bps data
[BCCH / Voice / Voice / Voice / Voice / Voice / Voice / Voice]
General Packet Radio System (GPRS)
Increases the data capability of the network using dedicated GPRS time slots
9600 bps to 53 kbps
[BCCH / Voice / Voice / Voice / Voice / Voice:GPRS Shared / GPRS / GPRS]
Enhanced Data rates for Global Evolution (EDGE)
New data speeds (59.2 kbps to 473 kbps)
EDGE and GRPS can share dedicated or dynamic time slots
[BCCH / Voice / Voice / Voice / Voice/ Shared / EDGE:GPRS / EDGE:GPRS]
Hands off to W-CDMA
Wideband CDMA - Universal Mobile Telecommunications System (UMTS)
3G - “Always-on” Technology
64 kbps to 384 kbps mobile, 2 Mbps stationary

[ 本帖最后由 laomaoyixin 于 2009-10-21 19:43 編輯 ]