Chuyển giao trong cùng tần số
Transcript of Chuyển giao trong cùng tần số
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CHUYNGIAOTRONGCNGTNS
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2.1. Chuyn giaomm
2.2. Lich linktchuyn giaomm
2.3. Tngphcachuyn giaomm
2.4. lidunglngmngcachuyn giaomm
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2.1. CHUYNGIAOMM
A. Nguyn l chuyn giao mm
B. Cc thut ton cachuyn giao mm
C. Cc cimcachuyn giao mm
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A. NGUYNLCHUYNGIAOMM
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ivichuyn giao cng, mtquytnh xc nhl c thchinchuyn giao hay khng v my dingch giao tipvimt BS timtthiim.
ivichuyn giao mm, mtquytnh c iukincto ra l c thchin chuyn giao haykhng. Tuthuc vo s thay icng tn hiuknh hoa tiu t hai hay nhiutrmgc c linquan, mtquytnhcngcui cng sctora giao tipvi duy nht 1 BS.
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Qu trnh chuyn giao mm khc nhau trn cchngtruyndn khc nhau.
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B. CCTHUTTONCACHUYNGIAOMM
Thuttonchuyn giaomm IS-95A
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1, Ec/I0 pilot vt qu T_ADD, MS gi thng ipocng pilot (PSMM) v truyn tn hiu pilotntphpngc.
2, BS gimt thng ipiukhinchuyn giao(HDM).
3, MS chuyn tn hiu pilot ntphp tch cc vgi thng ip hon thnh chuyn giao (HCM-Handover Completion Message).
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4, Ec/I0 pilot xungdimc T_DROP, MS btubnhthingtchuyn giao.
5, Bnhthingtchuyn giao kt thc hotng. MS gimt PSMM.
6, BS gimt HDM.
7, MS gimt tn hiu pilot ttphp tch ccntphp ln cn v gi HCM
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TronghthngWCDMA, sdngthuttonphctphnnhiu
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Reporting_rangel ngng cho chuyn giao mm. Hysteresis_event1A l trb sung Hysteresis_event1Bl trloib Hysteresis_event1Cl tr thay th Reporting_range Hysteresis_event1Acgi l
Window_add Reporting_range+ Hysteresis_event1Bcgi l
Window_drop T: l khongthi gian khixng. Pilot_Ec/I0 :chtlngclc v co Ec/I0
ca CPICH
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Best_pilot_Ec/I0 l cell co v c cngmnhnht trong tphp tch cc;
Best_candidate_pilot_Ec/I0 l cell co ccngmnhnht trong tphp gim st.
Worst_candidate_pilot_Ec/I0 l cell co ccngyunht trong tphp tch cc.
Tphp tchccActive Set: L tphp cc cellc ktnichuyn giao mmvi UE.
Tphp lncn/tphp gim st(Neighbourset/Monitored set): L danh sch cc cell m UElin tipo, nhng pilot_Ec/I0 khng mnhbsung vo tphp tch cc.
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C. CCCIMCACHUYNGIAOMM
So viphngthcchuyn giao cngtruynthng, chuyn giao mm c nhnguim rrng, nhloitrhiungping-pong v to ra slin tc trong truyndn (khng c ngt qungtrong chuyn giao mm).
Ngoi iukhin di ng, cn c mt l do khc thchinchuyn giao mm trong WCDMA; cng
viiukhin cng sut, chuyn giao mmcngcsdngnh l mtccugimnhiu.
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2.2. LICHLINKTCHUYNGIAOMM
Mcchu tin cachuyn giao mm l emlimtschuyn giao khng bngt qung vlm cho hthnghotngtt.iuch c thtcnh:
li phn tpvm: li ch phn tp nhphadinh chm v ssttngtcacng tnhiu
li phn tp vi m:li phn tpnh phadinhnhanh.
Vic chia stingxung
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2.3. TNGPHCACHUYNGIAOMM
Tng ph cachuyn giao mmcsdngnh gi chtlngcahotngchuyn giaomm trong mtmng.
Tng ph chuyn giao mm c xc nhnhsau:
Trong , Nl kch ctphp tch cc v Pn lxc sut trung bnh ca UE angthchinchuyngiao mm n_ng (n_way).
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2.4. LIDUNGLNGMNGCACHUYNGIAOMM
li dung lngmng c thcachuyn giaommchyuphthuc vo:
- Tng ph chuyn giao mm (tc l tltngica cc UE thchinchuyn giao mm)
-li lin ktchuyn giao mm
- Thut ton iukhin cng sutc p dng.
+iukhin cng sutthng (iukhin cng
sut nhanh)+iukhintruyndn phn tpchnla site(SSDT).
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III, CHUYNGIAOGIACCH
THNG WCDMA V GSM
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Cc chun WCDMA v GSM htrchuyn giao chai nggia WCDMA v GSM. Schuyn giaony c thsdng cho mcchph sng v cnbngti.
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Thtcchuyn giao :
- Vickhixngchuyn giao l mtthut ton doRNC thchin v c thda vo chtlng(BLER) hay cng sut pht yu cu.
- Khi khixngoc, u tin UE so cngsut tn hiuca cc tns GSM trong danh schln cn.
- Khi ktquoccgiti RNC, n ralnh cho UE gii m nhndngtrmgc (BSIC)ca cell ngc GSM ttnht.
- Khi RNC nhnc BSIC, mtlnhchuyn giaocgiti UE.
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IV, CHUYNGIAOGIACCTNS
TRONG WCDMA
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Huht cc bvn hnh UMTS
u c 2 hoc 3 tns FDD c
hiulc. Vicvn hnh c th
btusdngmttns, saucntng dung lng, mt
vi tns c thsdng.
Mt vi tnscsdng trong cng mt site s
tng dung lngca site hoc cc lp micro vmacro csdng cc tns khc nhau.
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Thtcchuyn giao:
- MS cngsdngthtcngb WCDMA gingnhchuyn giao trong tnsnhndng cell ctnsmc tiu.
- Thi gian nhndng cell chyu ph thuc vos cc cell v s cc thnh phnang m MSc th thu cgingnh trong chuyn giao cngtns
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V, TNGKTCHUYNGIAO
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Cc kiuchuyn giao ctngkt trong bng:
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