bao hieu seminar
TRANSCRIPT
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TNG QUAN V BO HIU
Bo hiu?
Phn loihthng bo hiu
L ngn ngtrao i gia cc thit b c lin quan n cc chdn iu khin, gim st cc kt ni cuc gi
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SP l node trong mng bohiu, thc hin cc chcnng cah thng bo hiu,
mi SP c mt m ring vduy nht
STP l mt SP c kh nng nhtuynbn tin bo hiun cc imch khc nhau
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SL (signaling Link) l ngd liuktni 2 im bo hiu
SLS (signaling Link Set) l tphpmts cc ng bo hiu song song ktni cng cc im bo hiu
SR (signaling Route) L
ng bo hiu xc nhtrc truyn bn tin bo hiu tngunnchSRS (signaling Route Set)
Nhm tt c cc tuyn trongmng bo hiu m c thtruyn ti bn tin bo hiu tngunnch
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CC LOI BN TIN
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Table 3-2, pg 31
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CC LOI BN TIN
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CL CO
SCCP
MTP
TCAP
MAP
BSSAP ISUP
NSP
TUP
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Cu trc h thng GSM
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C IM CA GIAO THC MAP
Trong m hnh OSI giao thc MAP nm trn giao thc TCAP v u
tngngvilp 7 ca OSI. Giao thc ny cthitlp trongMSC, VLR, HLR, EIR thchin:
- ng k v tr
- Hubv tr
- ng k li
- Gim st, qun l, khiphcli cc dchv thu bao
- Chuyn giao
- Truyn cc thng tinbomt, nhnthc
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CC THNH PHN CA GIAO THC MAP
Mi SSN c SCCP s dng a ch ho mt thc thmng GSM c nh
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Mi Application Entities (AE) bao gm mt s ApplicationService Elements (ASE) . Cc ASE c nhm phc vcc chc nng chung v chc nng ring
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MT S CHC NNG CA ASE TRONG MAP
ASE btk trong MAP u c khnng giao tipvi cc ASEkhc mt cch ngthi:
- Cpnhtv tr (VLRHLR)
- Hubv tr (HLRVLR)
- Chn dliu thu bao (HLRVLR)
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MAP in MSC/VLR and HLR
Khi MAP trong mt node c th giao tip vi cc khi MAP ca node khc. Mikhi giao tip vi mt khi thnh vin c lin quan n chc nng tng ng ca khi
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Protocols between MSC and MS
Giao thcgia BSS v MSC gm 3 giao thc:- DTAP: Direct Transfer Application Part : Cc bn tin qun l di ng, iukhin
ktnicucgi ch knh ni, iukhin cc dchv cung cp c lin quanncucgi
- Initial MS Message:
- BSSMAP: Base Station Subsystem Management Application Part
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Cc bn tin qun l di ng ca DTAP
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Cc bn tin kt ni ch knh ca DTAP
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CC LOI BN TIN INITIAL MS MESSAGES
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BSSMAP Message Structure
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X l gi cho thu bao thuc PSTN v thu bao thuc mng GSM
MAP/TCAP
TUP/ISUP ISUP
ISUP
BSSAP
TUP
LAPD
LAPDm
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KT LUN
Bo co chuyn : Bo hiu trong mng GSM tm hiu c:
- Tng quan v mng bo hiu
- Cu trc cc bn tin bo hiu
- Chc nng v cu trc cc bn tin cho phn ng dng di ng
- X l cuc gi qua mng GSM thng qua bo hiu- Phng php khc phc khi bn tin bo hiu b li