?13? ??????? (generations in wireless networks)

1
???????

• ?13? ??????? (generations in wireless networks)

2
???????

• ?????????? (generations in wireless networks) ?
• ??????????????? ?
• ????????????????? ?
• ??????????????? ?

3
?2G?3G??
4
??? (1G , First Generation)

• ?????????
• AMPS(Advanced Mobile Phone System)
• Total Access Communication System(TACS)
• Nordic Mobile Telephone(NMT)

5
??? (2G , Second Generation)

• GSM(Global System for Mobile communications)
• D-AMPS(Digital AMPS)
• IS-95
• PDC(Personal Digital Cellular)
• CT2?DECT(Digital Enhanced Telecommunications)?PHS(
  Personal Handyphone System)

6
?2.5? (2.5 G)

• HSCSD (High Speed Circuit-Switched Data)
• GPRS (General Packet Radio Service)
• EDGE (Enhanced Data Rates for Global Evolution)
• IS-95B
• cdma 2000

7
??? (3G , Third Generation)

• WCDMA (Wideband CDMA)
• ???TDMA (Advanced TDMA)
• ????CDMA/TDMA (Hybrid CDMA/TDMA)
• OFDM
• IMT-2000

8
??3G?????

• 3GPP
• 3GPP2

9
UMTS??????
10
?????????