GSM/PHS - PowerPoint PPT Presentation

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GSM/PHS

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Title: GSM/PHS


1
?????????
2
??
  • ??/???/???? ??
  • ?????
  • GSM/PHS
  • ????
  • ??????
  • PHS?GSM?????
  • GPRS
  • ??????????.

3
??/???/???? ??
  • ????????"??????"(Cellular mobile phone),
  • ??????1940?,??????????
  • ??????-??????.
  • ????????????
  • 1.???????
  • 2.???????????????????
  • 3.??????
  • 4.???"??"?????

4
??????
  • ??(Antenna)
  • ????????????????
  • ??(Band)
  • ???????????
  • ??(Channel)
  • ?????????,?????????????,???????????????
  • ??????(Coded Squelch)
  • ????????????,????????????,????????????????
  • ??(Frequency)
  • ????????(?????)???????????
  • ??(Hertz)
  • ?????????,?????????????????????,?????????????

5
??????
  • ???(High Band)
  • ?????,?132?174MHz?
  • ??(Microwave)
  • ????1000MHz????
  • ???(Mid Band)
  • ?????,?72?76MHz?
  • ????
  • ???????,???????
  • ????
  • ?????????????????,????????????
  • UHF
  • 406-420MHz?450-470MHz???470-512MHz ?????????
  • VHF
  • 136-160MHz?????????,????????

6
GSM
  • ?????,???????CEPT??????????????,?????Group
    Special Mobile(GSM)????????????????????
  • ?????GSM????????????????????????ETSI??,???????GSM
    ????,ETSI????????????????GSM????????????????????G
    SM MOU,?????GSM????????????,??????(??)??,MOU??????
    ??????????
  • ????????????????????

7
PHS
  • PHS ? Personal Handy-Phone System
    ???,???????????????,??1900 ?????????????????
  • ????????????????,????? PHS???? PACS ???? DECT ???
  • PHS??????????????????????????????????????,????????
    ????????????????? PHS ???????,????????????????????
    ??????????????,???????????????,??????????,????????
    ??????????
  • ???????????????????????

8
????
  • GSM??
  • 900/1800/1900 MHz
  • ??????????????????,??????(Hz),1
    Hz????????(????),?????(MHz)??????????

9
??????
  • ??????????????
  • ??????????????????????
  • ???900?????????????1800 ???????,???????????????
  • ?X?????????,????????????????(??),???X?????????????
    ?????????????
  • ????????,??????,????????????????????????????????
    ???????????????,???????(????)?????(X?)??????????

10
PHS?GSM?????
  • ????\?? PHS GSM
  • ????? ?? ??
  • ??????? 500?? 20?
  • ??? 100??/?? 120??/??
  • ???? ??80?? 100????
  • ?????? ??10?? 6001000??
  • ???? ??600?? ???300??
  • ?????? 6-8?? 23??

11
GPRS( General Packet Radio Service )
  • ? GSM ??????????? ( Circuit-Switch )
    ??,????????????????? ( Packet-Switch )
    ???,?????,????????????????,???????
  • GPRS ?????????????,???????????????
  • GPRS ????????? GSM ???,??????????,????????????????
    ?,???? GSM ??????????????
  • GPRS ????????????,?????,????? 160 Kbps????? GSM
    ?????? ( Data ) ? 9.6 Kbps ??,????????

12
EFR ????
  • EFR(Enhanced Full Rated Coding)?
  • ?????????
  • ???????????????
  • ????????EFR???,???????????,??????EFR??,???????????
    ????

13
WAP ??
  • WAP ( Wireless Application Protocol ),
  • ??????????????????,??????????? ( ? GSM ?? )
    ?????????,????????????
  • WAP ?????????????
  • ??????WML,????????????????? HTML ?????
  • WAP Gateway / Proxy,?????????????
  • ??????????????(GSM??) ?

14
I-mode
  • ??????(?WAP??)???
  • ?WAP???
  • ?????
  • ?????
  • ????
  • ??cHTML

15
??? MMS ?
  • ???????MMS (Multimedia Messaging Service)
  • ??SMS???????????????, MMS?????????????????????(???
    ???????????,???????, ?????????????????
  • MMS??GPRS???WAP?????????????
  • MMS????????????????????,????????????,
  • ????????MMS????,???????MMS??????,

16
3G ????
  • ??????????3G ( third generation )
  • ?????????????,??????????????
  • ?????????????,?????????????,???????????,??????????
    ???????????????????????????????????????????????,??
    ????????
  • 3G??????????,????????????,???????????????????????
    ??????????????????????????????

17
JAVA
  • Java ??????,??????????
  • Java ??????????CPU??????
  • ?????,??????????????????????????
  • Java ?????????,??? java?????????(??)????
  • ??????????????
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