?12? ??????(wireless data communications) - PowerPoint PPT Presentation

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

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... (CDPD, Cellular Digital Packet Data) GPRS(GSM Packet Radio Service) CDMA EDGE Wireless LAN ... – PowerPoint PPT presentation

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Title: ?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 ?
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