?12? ??????(wireless data communications)

1
???????

• ?12? ??????(wireless data communications)

2
???????

• ????????? ?
• ??????????? ?
• ?????????????????????? ?

3
?????????

• ????????(query/response applications)
• ?????????(batch file applications)
• ????????(streaming data applications)

4
???????????
5
?????????

• ???????????? (full user mobility)
• ???????? (portable wireless data)??
• ????????(fixed wireless data)??

6
????????????
7
??????

• ARDIS
• RAM Mobile Data
• ???????(packet radio network)
• ????????
• (CDPD, Cellular Digital Packet Data)
• GPRS(GSM Packet Radio Service)
• CDMA????

8
???????????

• EDGE
• Wireless LAN
• ??(Bluetooth)

9
???????(packet radio network)???
10
CDPD??????
11
?GSM????GPRS??
12
GPRS?????
13
GPRS???????
14
GPRS???

• ??
• ????(VAS, value-added services)
• ????(electronic commerce)
• ????(location-based services)
• ?????(vertical applications)
• ??(advertisement)

15
WAP gateway???
16
Q A

• ???ad-hoc network ?
• ?????????Hidden terminals ?