Mobility Management

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Chapter 4 ????

• Mobility Management

2
????

• ???????????????????????,??????????????????????????
  ?????,??????????,???????????(mobility
  management)???????????????????,??????????(??locati
  on tracking),????????????,????????????????????????
  ?(??handoff)?

3
????

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

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Section 4.1??????Issues of Mobility Management
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PCS??

• PCS???PSTN?????????????
• ??????????????,????????????,??????????????
• ????????????????PCS???????,????????????????,??????
  ???(roaming)?
• ????????,PCS????????????????

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PCS???????

• ?4-1????????????,???????
• ???(Base Station,BS)?????????????????????????????
  ??(radio link)?
• ??????(Mobile Switching Center,MSC)PCS?????????,?
  ??????PSTN?
• ???????(Home Location Register,HLR)???????(Visito
  r Location Register,VLR)?????????????????,???????
  ??????

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? 4-1 ???????????
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HLR VLR
HLR
VLR
VLR
VLR

• HLR
• ???????????????????????????????????
• VLR
• ????????????????,??VLR??????????????
• ???????????????????????,??HLR?????????,???????????
  ??
• ???????????????
• ??VLR??MSC??????

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????(Mobility Management)

• ????????,???????????????,???HLR?VLR??,????????????
  
• ??????????
• ????(location management)
• ????(handoff management)

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????(Location Management)

• ??????????????,???????
• ??????PCS????????PCS??????????????,??????(roaming
  management)?

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????(Handoff Management)

• ????????,?????????????????(coverage
  area)?,?????????????????????????

• ??????????????????????,????????(handoff),?????????
  ????

12
?????????

• ???????????,PCS?????????,????????????????????
• ????????????
• EIA/TIA IS-41???????????,?AMPS?IS-136?cdmaOne?PACS
  ??????
• GSM Mobile Application Part(GSM
  MAP)???????,?GSM????????
• ????????????????????

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Section 4.2????Roaming Management
14
???

• ????????
• ??(call origination)
• ????????
• ??(call termination)
• ??????,??????????? ???????????? ?
• ?????????

Database
MSC
15
???????

• ????????????????,????????????,????????(registratio
  n)?
• ????????HLR?VLR??????,??????(location update)?
• ?????????,?????????????????,???????????,??????????
  ?(location tracking)?

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? 4-2 ??????
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?????????

• ?? 1. ????Old VLR???New VLR?,?????New VLR???
• ?? 2. New VLR??????HLR?????????,????HLR??????????H
  LR???????????????New VLR?
• ?? 3. New VLR???????????
• ?? 4. ???2??,HLR??Old VLR??????(deregistration)???
  ,?????Old VLR??????????,Old VLR?????????????HLR?

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Section 4.3??????Call Setup Procedure
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? 4-3 ??????
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????

• ?? 1. ????????MSC??,???????????
• ?? 2. MSC???????VLR?VLR????????,???????????
• ?? 3. ???????VLR???,?MSC?????????????????PSTN???

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? 4-4 ??????
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???? (1/2)

• ?? 1. ?PSTN??????????,?????????PSTN??????????
• ?????????????(originating switch)
• ??????????????????HLR??????,??????????????????????
  HLR??????????????MSC?
• HLR????????,????????VLR,???VLR???????????VLR??????
  ???(routable address)????????,?????????????MSC?

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???? (2/2)

• ?? 2. ???????VLR???HLR,????PSTN?????
• ?? 3. ??????,??????PSTN???????MSC,??MSC?????,?????
  ???????

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Section 4.4????Handoff Management
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??

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

• ????????????????????,???????????????,?????????,???
  ???(forced termination)?

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???????

• ????(handoff detection)
• ??????????????????????,??????????????
• ???????(channel assignment)
• ??????????????,????????????
• ????(link transfer)
• ?????????,????????????????????,????????????

27
????

• ?????????
• ????????????????????????
• ???????
• ??????(Word Error Indicator,WEI)
• ????????(Received Signal Strength
  Indication,RSSI)
• ????(Quality Indicator,QI)

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?????

• ???????????
• ??????(Mobile-Controlled Handoff,MCHO)
• ??????(Network-Controlled Handoff,NCHO)
• ??????(Mobile-Assisted Handoff,MAHO)

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??????(MCHO)

• ????????????????
• ??????????,???????????????
• ?????DECT?????PACS?

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??????(NCHO)

• ????(???????) ?????????????
• ???????????,???????????????
• ???????,???????????
• AMPS??CT2??????FDMA??,?????????????????????,?????
  ??????????

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??????(MAHO)

• ????????????????
• ???????????,???????????????
• ??GSM?
• ???????????

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???????

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

33
????

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

MSC
????
????
34
?????????

• ??????????????
• ????????,??MSC???????????????
• ???????????handoff??????????????
• ?????????,???????????

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???????

• Intra-BTS handoff????BTS?????
• Inter-BTS handoff??BTS??????BSC??
• Inter-BSC handoff??BTS??????BSC,????BSC??????MSC?
  ?
• Inter-MSC handoff(???inter-system
  Handoff)??BTS??????MSC??
• Inter-system handoff??BTS??????PCS???

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? 4-6 Inter-BTS handoff
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? 4-7 Inter-BSC ????
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Inter-BSC Handoff ??? (1/2)

• ????????????(MCHO)?
• ?? 1.
• ??????,?????????(BTS 3)??????????,????????????????
  
• ???????????,??????????(BTS 2)????????

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Inter-BSC Handoff ??? (2/2)

• ?? 2.
• ??????????MSC?
• MSC???????????????,??????????????
• MSC????(bridge)?????????,?????????????????????????
  ????
• ?? 3. ???????????,??????????????????????
• ?? 4. ??????????,????????????,??????????

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? 4-8 Inter-MSC????
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Inter-MSC Handoff ??? (1/2)

• ??????????(NCHO)?
• ?? 1.
• MSC A ?? MSC B ?????????????????
• MSC B ?? BS 3,?? BS 3 ????????
• MSC B ?????????????? MSC A?

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Inter-MSC Handoff ??? (2/2)

• ?? 2.
• MSC A ?? BS 3 ?????????,???????????
• MSC A ?? MSC B ?????????????
• ?? 3.
• MSC A ????????????????,?????? BS 3
  ?????,????????BS 3?????
• ??????? BS 3 ?,MSC B ?? MSC A ???????????,MSC A
  ??????????? MSC B,?????????

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????????(Anchor MSC)

• ??????????? MSC,???4-9,????????(trunk)?? MSC A ??
  MSC B,??????? MSC C?
• ? PSTN ??? MSC A ???????????(anchor MSC),MSC A
  ??????????? PSTN ??,?? MSC A ????? MSC?
• ??????????????

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? 4-9 MSC A?handoff????????????
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Section 4.5???????Hard Handoff and Soft Handoff
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???(Hard Handoff)

• ?? TDMA ? FDMA ???,?????????????????,????????
• ???????????????,???????????
• ????????????(hard handoff)?
• Inter-BSC handoff ?????
• MCHO??4-11?
• MAHO??4-12 ?

MSC
Old BS
New BS
2. ?????
1. ?????
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???(Soft Handoff)

• ?? CDMA ???,?????????????????,????????
• ??????????????(MAHO)??
• ??????????????(MAHO)??
• ????????????(soft handoff)?

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? 4-10 ???
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? 4-11 MCNO ? Inter-BS ?????????
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MCHO ? Inter-BSC Handoff ??? (1/3)

• ?? 1. ?????????,??????????????(link
  suspend)??????,?????????
• ?? 2. ??????????????,?????????(handoff
  request)????,???????
• ?? 3. ????? ??2. ????????????????????(handoff
  acknowledge)?

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MCHO ? Inter-BSC Handoff ??? (2/3)

• ?? 4. ?? ??3. ???,??????????????????(link
  resume)?
• ?? 5. ????????????????
• ?? 6. ????????2.????,??MSC???????????(cipher
  key)????????????????????
• ?? 7. MSC ????????????????????????????

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MCHO ? Inter-BSC Handoff ??? (3/3)

• ?? 8. ????????????????(handoff execution)?
• ?? 9. ????????????????????(access release)?
• ?? 10. ????????????,??????????(handoff
  execution)?
• ?? 11. ???????????????(handoff complete),?????????
  
• ???????????????,?????????????????

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? 4-12 MAHO ? Inter-BS ?????????
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MAHO ? Inter-BSC Handoff ??? (1/3)

• ??1. ????????????????(measurement report)?????
• ??2. ???????????????,??? MSC ???????(handoff
  required)?
• ??3. MSC ?????????,?????????????,?????????(handoff
  request)??????

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MAHO ? Inter-BSC Handoff ??? (2/3)

• ??4.?5. ???????????(handoff request
  acknowledge),MSC ??????,????????????????????(hando
  ff command)?
• ??6. ?????????????????????(handoff command)?

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MAHO ? Inter-BSC Handoff ??? (3/3)

• ??7. ????????????????,?????????(handoff
  complete)??????
• ??8. ?????? MSC ?????????(handoff complete)?
• ??9. MSC ???????????????(clear command)?
• ??10. ???????????? MSC,????????(clear complete
  acknowledgement)?

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? 4-13 ?????????
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MAHO ????????? (1/3)

• ?? 1. ??????????????????????????(pilot strength
  measurement)?
• ?? 2.?3.
• ??????????????(handoff request)? MSC,????????????
• MSC ????????,?????????(handoff request)???????
• ?? 4. ???????(null traffic)???,?????????????

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MAHO ????????? (2/3)

• ?? 5.?6.
• ????????(join request)?MSC,?? MSC
  ?????????????????
• MSC????(join acknowledgement)?
• ?? 7.?8. ??????MSC??????(handoff
  acknowledgement)??????,????2.?3.?
• ?? 9.?10.???????????????????(handoff command)?

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MAHO ????????? (3/3)

• ?? 11.?12. ?????MSC???????????(handoff
  information message?acknowledgement)????????
• ?? 13.?14.????????????????????(pilot measurement
  request),????????(pilot strength
  measurement)??????????

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? 4-14 ?????????
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MAHO ????????? (1/3)

• ?? 1. ??????????(pilot strength
  measurement)?????????
• ?? 2.?3.
• ???????????,???????????(handoff command)?
• ??????(handoff complete),??????????????????
• ?? 4.?5. ??????????????????(interface primary
  transfer)?

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MAHO ????????? (2/3)

• ?? 6.?7. ??????MSC?????????(handoff
  information),??????????????????
• ?? 8.?9. ??????????????????(pilot measurement
  request),????????(pilot strength
  measurement),??????????????????,???????????????

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MAHO ????????? (3/3)

• ?? 10.?11. MSC????????????????(remove
  link)?????????????????????????????

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???(Softer Handoff)

• MS ?????????,?????sector?????,?????(softer
  handoff)?

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???????

• Soft handoff
• MS ???????????????????
• ???????????
• ???????????
• Hard handoff
• ????????????
• ??????????????????
• MS ?? BS ????????????????????

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Section 4.6??Summary
68
Summary

• PCS???????,??????????????????????????????????????
• ???PCS????????,???HLR?VLR??????,?????????
• ????,???????????????(signaling system)????

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Homework