Mobile Wireless Communication

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Mobile Wireless Communication

• Technologies And Services Existing Today
• Global System for Mobile Communication (GSM)
• Time Division Multiple Access (TDMA)
• Code Division Multiple Access (CDMA)
• Mobile Wireless Market Technology Forecast

• Mobile Wireless ??????????????????????????????????
  ??????????????????????????????????????????????????
  ???????????????????????????????

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• Technologies And Services Existing Today

• ????????? mobile ??????? 2 ???????????????????????
  ???????????????????????????????????????????? GSM,
  TDMA(IS 36) ??? CDMA(IS95)

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• Global System for Mobile Communication (GSM)

• Air interface ??? GSM ????????????????????????????
  ??????????????? TDMA ????????????????????????????
• ?????? GSM ????????????????????????????????????
  96000 bps eg. X.25 X.32
• ????? GSM ?????????????????????????
• ????????????????????? ? (Short Message
  Service-SME)
• Europe Version ??? GRM ???????????????????? 900
  Mhz

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Global System for Mobile Communication (GSM) cont.
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• Time Division Multiple Access (TDMA) IS-136
  Technology

• TDMA ?????????????????????????????????????????????
  ???????????? EIA\TIA
• ??????? United state ??? TDMA ??? Interium
  Standard 50 (IS-136)
• TDMA ??????????????????????????????????? analog
  ???????????????????????
• ??????????????????????????? dual-mode ???
  ?????????????????????? board ????????????????????
  analog ??????????????
• Universal Wireless Communication Consortium
  (UWCC) ??????? ?

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• Code Division Multiple Access (CDMD) Technology
  (IS-95) (cdmaOne)

• What is CDMA ?
• ????????? CDMA ???????????????????????????????????
  ??????????????? IS-95
• ?????????????????????? CDMD ???
  ??????????????????????????????????????????????????
  ????????????????????????????????????????

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• Code Division Multiple Access (CDMD) cont.

• CDMA Concept !!!!

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• Code Division Multiple Access (CDMD) cont.

• Frequency Reuse

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• Code Division Multiple Access (CDMD) cont.

• CDMA Network

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• Code Division Multiple Access (CDMD) cont.

• IS-95 ?????????????? mobile ??? Base Station
  ?????? dual-mode wideband spred sprctrum

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• Code Division Multiple Access (CDMD) cont.

• Spread Spectrum
• ?????????????? (spread) ???? vary wide channel
  ????? ? ??? user ?????? ?
• ????????????? subscriber ?????????????????
  Quality of service ??????

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• Code Division Multiple Access (CDMD) cont.

• Frequency-hopping spread spectrum

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• Code Division Multiple Access (CDMD) cont.

• Direct-sequence spread spectrum

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• Code Division Multiple Access (CDMD) cont.

• Chip Rate

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• Code Division Multiple Access (CDMD) cont.

• Correlation

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Generate Code
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????????????????? Direct Sequence
??????????????????? BPSK
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????????????????? Direct Sequence
??????????????????? BPSK
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• CODE ???????????? CDMA(IS-95)

• Walsh code
• Long PN code
• Short PN code

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Downlink / Forward Link

• Forward pilot channel
• Forward synchronization channel
• Forward paging channel
• Forward traffic channel

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• ???????????????????????

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• Forward Pilot Channel

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• Forward Synchronization Channel

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• Forward Paging Channel

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• Forward Traffic Channel

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• Reverse Link / Uplink

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• Access Channel

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• Uplink traffic channels

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• Mobile Station Call Processing

• Mobile station initialization state
• Mobile station idle state
• System access state
• Mobile station control on the traffic channel
  state

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• Mobile Station call processing states

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• Base Station Call Processing

• Pilot and Sync channel processing
• Paging channel processing
• Access channel processing
• Traffic channel processing

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• ??????????????????????????????? CDMA

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• Mobile Wireless Market
• Technology Forcasts

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• The End