Chuyển giao trong cùng tần số

7/31/2019 Chuyn giao trong cng tn s

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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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