Introduction to Personal Communications Services

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Chapter 1 ????????

• Introduction to
  Personal Communications Services

2
????

• ??????(Personal Communications Services,PCS)???,??
  ?????????(wireless communication)???,?????????????
  ??(anytime)?????(anywhere)???????????(any
  terminal)????????
• ??????????????(PCS network)??????????????,????????
  ????

3
????

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

4
Section 1.1?????????PCS Concepts
5
?????????

• ??????(Personal Communications Services,PCS)???,??
  ?????????(wireless communication)???,?????????????
  ??(anytime)?????(anywhere)???????????(any
  terminal)????????
• ?????? ???(mobility)
• 24 hours ????
• ???(personality)

6
????

• ????????(mobile communication)
• ???????(cellular phone)
• ??????(Wireless Local Area Network,WLAN)
• ??????????????
• ???????
• ????????????????
• ????????????????????????????????????

7
??????????
8
Section 1.2??????????? Architecture of PCS
Networks
9
????????

• ????????(Public Switched Telephone
  Network,PSTN)??????????????,??????????
• ??????,????????????????????????,??????????????????
  ??

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? 1-1 PSTN ???

• ???????,????????,??????????(switch)???????????????
  ??,?????????????

11
????????

• ???????????????????????(Public Land Mobile
  Network,PLMN)?
• ???????,??????????????,??????????
• ????????????,???????????????????????????,????1-3??
  ??

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? 1-2 PLMN ???

• ???????????????(base station)??,?????????????,????
  ????PSTN?????

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? 1-3 PCS ?????

• ?????????????,????????????????

14
???????

• ???????(radio network)?????(access network)
• ?????????
• ??(Mobile Station,MS)
• ??????(Base Station Subsystem,BSS)
• ??????????????
• ??????????????????????

15
??????

• ????????
• ?????(Base Transceiver Station,BTS)
• ??????(Base Station Controller,BSC)
• BTS??????????,??????????,???BTS??????,?????BTS???
• BSC??BTS???,??????????,?????

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GSM ??
17
GSM ?????
18
??????

• ??PSTN,PCS????????????????????????????,???????????
  ?,????????(Mobile Switch Center,MSC)?
• MSC????????????,?????????????????????????(mobility
  database),?????????????????????
• ?????????????????,????????(core network)?

19
????

• PCS???????(mobility management)??????????????,????
  ???,?????????????????????(????,handoff)?
• ??????????

20
???????

• ??????????????????????(signal)
• ???????????????(signaling network)
• ??????????????????????(Signaling System No.
  7,SS7)
• SS7??????

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Section 1.3???????History of Mobile Systems
22
???????

• 1901, long-distance wireless transmission
• ?1920????????????????,???????????,??????????????19
  30???,?????????????
• ????????(Frequency Modulation,FM)?????????????
• ?????????,????????????????????????????????????????
  ,???????????????????????(frequency band),????????

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?????? (1/2)

• ??1940????,??????????(cellular)????
• ????????????,????????,??????????????,?????????????
  ,????????
• ????????????,????(cell)???????????????,???????????
  ?????????,???????????

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?????? (2/2)
cluster
?
?
?
cell
sector
?
?
?
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PCS ???
???
???
???
Mobile Satellite
JTACS
JDC
??????
TACS
GSM
GSM,
NMT
IMT-2000
AMPS
NADC
PCS
PHS
????????
PACS
CT0/1
CT2
DECT
26
???????

• ????????????,??????(duplex)???????(multiple
  access) ???
• ??????????????????,???????????,????????

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???v.s.???

• ??????????,???????????
• ??????????????????????????

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

• ??????????????????????

??
A1 talks to A2
Down Link
B1 talks to B2
C1 talks to C2
A2 talks to A1
Up Link
B2 talks to B1
C2 talks to C1
??
29
????

• ???????????????????,????????,?????????????,???????
  ?????,???????????

30
????

• ????(multiple access)????????????,??????????????
• ?????????????????,?????????
• ?????????????????,??????,????multiple access?

31
??????

• ?????????,??????????

????3?????
32
??????

• ???????????????????????????(time slot)?????

????3?????
33
??????

• ?????????????????????????

????3?????
34
2G Cellular Telephony

• Global System for Mobile Communications (GSM)
• EIA/TIA IS-136 Digital Cellular System
• EIA/TIA IS-95 Digital Cellular System
• Japanese Digital Cellular (JDC) in Japan

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Global System for Mobile Communications (GSM)
(1/2)