Chapter 6 GSM??

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Chapter 6 GSM??

• GSM System

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????

• GSM???Global System for Mobile Communication,???Gr
  oup Special Mobile,?????????????????,?????????????
  ?????????????????GSM??????????,??GSM??????,???????
  ???,??????????????GSM???,???????GPRS?UMTS?????????

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????

• GSM????
• GSM????
• GSM?????
• GSM????
• ?????
• GSM?????
• ????
• ??
• ??

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Section 6.1GSM ????GSM Overview
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GSM

• Global System for Mobile Communication
• ???Group Special Mobile
• ?????????????????
• ?????????(European Telecommunications Standard
  Institute,ETSI)???,???????????????,???????????????
  ??
• 1999????3GPP(the 3rd Generation Partnership
  Project)?????????
• ???????

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? 6-1 GSM ??
EDGE
473kbps
GSM ?? 2
GSM ?? 1
UMTS/ HSDPA
GSM GPRS
UMTS
171.2 kbps
2M bps
10Mbps
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GSM ????? (1/2)

• GSM ??1???????????(circuit-switched transmission)
• GSM ??2???????(Short Message Service,SMS)?????(bea
  rer service)
• GSM
• ????????(High Speed Circuit Switched
  Data,HSCSD)?????????????????,????115.2kbps?
• ??????????(General Packet Radio
  Service,GPRS)?????????(packet-switched
  transmission)??,??171.2kbps?

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GSM ????? (2/2)

• GSM?EDGE(Enhanced Data rates for GSM Evolution)
  
• ??????????????????,????????384kbps?
• 3G?????????(Universal Mobile Telecommunications
  System,UMTS)
• ??WCDMA(Wideband CDMA)??
• ??????(Quality of Service,QoS)
• ????????(High Speed Downlink Packet Access,HSDPA)
  
• ??UMTS?????????

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Section 6.2GSM ????GSM Architecture
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GSM ?????

• ??(Mobile Station,MS)
• ??????(Base Station Subsystem,BSS)
• ????????(Network and Switch Subsystem,NSS)
• ???????(Operation Subsystem,OSS)
• ???????????
• ????(interface)???,?????????????????

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? 6-2 GSM ?????
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??

• ??????(Subscriber Identity Module,SIM)
• ???????????
• ????????????????????
• ????????? ?????????????????????
• ??????(Mobile Equipment,ME)
• ????????????????,?????????????

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??????

• ?????(Base Transceiver Station,BTS)
• BTS????????MS???????????
• ??????????????????????????
• ??????????????(signal strength measurement),BTS???
  ??MS??????????BSC?
• ??????(Base Station Controller,BSC)
• ??????????(channel assignment),????(handover)???

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?????????????

• ?????????????(Transcoder/Rate Adapter Unit,TRAU)
• BSS?GSM??????????????
• ???????13kbps?GSM????
• ??????64kbps?PCM(Pulse