BO CO GI K S:L MINH HINT SINH VIN:L TN THNH

QUN L TNH DI NG CA UE(MOBILE MANAGERMENT)

1.1)LOCATION REGISTRATIONTrong ti liu (1)

1.2)PAGINGTm gi(paging) l th tc quan trng ,dng thnh lp mt cuc gi, CN s gi 1 bn tin tm gi n UE thng qua UTRAN, sau khi nhn c, UE c nhn tin tm gi s khi to thnh lp mt kt ni n CN kt ni cuc gi ca mnh1.2.1)PHN LOI Theo ni khi to tm gi, ta chia thnh 2 loi:tm gi khi to t CN v tm gi khi to t UTRAN1.2.1.1)TM GI LOI 1

Hnh 1:tin trnh tm gi loi 1 loi ny, bn tin c khi to CN. UE ang trang thi CELL-PCH, URA-PCH hay IDLE mode,ni cch khc , UE ang trang thi ngh hoc khng truyn d liu.v th v tr ca UE c bit trong phm vi 1 LA hay RA n ng k. Bn tin c pht cho tt c cell trong LA hay RA sau khi UTRAN tnh ton thi gian tm gimc ch tm gi loi 1 thng l thnh lp cuc gi1.2.1.2)TM GI LOI 2

Hnh2 :tm gi loi 2 loi ny, tin tm gi c khi to ngay UTRAN.UE ang CELL-DCH hoc Cell-FACH, ni cch khc, UE ang c sn 1 kt ni khi nhn bn tin tm gi. v th, v tr UE c cp nhp, nn bn tin c pht ch trong cell cha UEmc ch ca tm gi loi 2 thng l cp nhp thng tin h thng v to lp thm kt ni(UE trong UMTS c th dng song song nhiu dch v khc nhau , chim 1 DCH nhng c nDTCH trong . Xt theo loi knh c s dng tm gi ta cng c 2 loi S_CCPCH v PICH1.2.1.3)TM GI S DNG S_CCPCHSau UE c thng tin h thng SIB5 ly thng tin knh chung, xc inh c knh S-CCPCH(secondary common control physical channel) mang thng tin v 1 knh PCH(paging channel). Trong PCH xc inh thng tin v PICH(Paging Indicator Channel) sau UE xc nh gi tr paging c cho mnh hay khng.Nu c,UE cng d trong S-CCPCH knh FACH v bt u gi yu cu kt ni1.2.1.3)TM GI S DNG PICHVic s dng S-CCPCH tn nhiu ti nguyn v nng lng UE rt nhiu(10ms 1 ln), khc phc nhc im , ngi ta s dng k thut DRX(discontinuous Reception):nhn khng lin tcSau khi c PCH v xc inh PICH,UE s khng dng S-CCPCH na m s ch gim st Paging Indicator vi k thut DRX Thng s: chu k gim st DRX Cycle Length (2^K)*PBP framesK:h s c trng cho DRX cycle length trong CN, SIB1, k=6PBP:paging block period: chu k khi tm gi, FDD , nhn gi tr 1 Khi DRX Cycle Length= 640ms

c hi tm gi(Paging Occasion): Paging Occasion (CELL SFN) = {(IMSI mod M) mod (DRX cycle length div PBP)} * PBP+ n * DRX cycle length + Frame Offsetvi SFN(system frame number) = IMSI mod (2^K) + n * (2^K) da vo tnh q bit Paging Indicator no gim st frame PICH

Vi PI = (IMSI div 8192) mod NPC thng s q, UE s bit c cn xem thng tin u trn S-CCPCH v ly thng tin cn thit

Hnh3:v tr xc nh DRX cycle length1.2.3) TIN TM GI lch biu tm gi:c thc hin trn MAC-C. sau khi MAC-C nhn c tin t CN, n tnh ton, lu li trong h s tm gi.8 tin l s tin ti a cho b nh ny. n thi gian pht tin, MAC-C truyn cho NodeB v NodeB s truyn chng trn knh tm gi cho cell ca mnh.c 2 thng s chnh trn bn tin l yu cu t CN v IMSI(international mobile subscriber indentity). bo mt thng tin, MAC-C s dung RNTI(radio network temporary indentity) thay th IMSI

thng s h s vng tm gi DRX:vi K cng ln,vng cng di, nng lng tiu tn cng t gi tr Np:s ca PI trn khung, c tri t (18,24,32,71,144)sau khi ly PI, UE gi iu ch knh S-CCPCH. Nu Np nh, nhiu UE s c chia s trn PI nhng UE s truyn nhiu ln hn.v ngc li khong thi gian truyn li tin tm gi: tng t l thnh cng ca tin tm gi, CN vf RNC s truyn li tin tm gi.vi 1 chu k tm gi, CN c th truyn li 4 ln s c CN gi bn tin tm gi cho RNC, nu RNC ang trong tnh trng qu ti, n s t chi truyn bn tin, v gi li tin thng bo RNC b qu ti ti CN ng truyn b li, hay hin tng khng bnh thng xy ra cell c th do suy hao ng truyn, CN v RNC dng n bin php truyn li Ti u Thng k lu lng: kim tra nhng trng location area paging success rate and RA paging success rate Cnh bo: kim tra cnh bo qu ti RNC CN v cnh bo iu khin lung RNC Kim tra phn nn t UE(Subscriber complaint) sau mi chu k Kim tra cuc gi: t l cuc gi thnh cng khi lng lng t nh v khi c phn nn t UE

1.3)HAND OVERL mt hot ng chnh , c ngha duy tr kt ni ca UE khi UE vn ang di chuyn. n gin c th ni khi i t cell c ph sng sang cell mi, mt kt ni mi c thnh lp v kt ni c c g b.C nhiu l do thc hin Handover nhng 1 l do chnh l nng cao cht lng kt ni, m bo kt ni Cell-DCH c lin tc.ko theo l hng lot cc tiu chun v th tc phc tp Hand over c 2 mc ch : Cht lng tn hiu:HO xy ra khi cht lng hay cng sut tn hiu h xung mc ngng cho php .Tn hiu s c d , so snh c UE v BS,v Handover c thc hin Cn bng lu lng:HO xy ra khi dung lng truyn t ca cell t ti mc nh.trong trng hp ny, UE gn ra ca cell s c HO cho cell ln cn1.1)TIN TRNH HANDOVER

Hinh 4:tin trnh c bn ca Handover o cht lng tn hiu:trong sut cuc hi thoi,UE lin tc theo di cng sut tn thiu vi 2 knh P-CPICH,S-CPICH(common pilot channel) vi s nh hng ca fading, suy hao ng truyn Quyt nh:bc ny ,RNC vUE thc hin so snh cc chun Handover, thng s thut ton a ra quyt inh c Handover hay khng Thc thi:nu bc 2 l c quyt inh c, UE hoc RNC s pht i cc bn tin yu cu vic Handover xy ra bc 3, s thc thi c th bt u UE hoc RNC+network evaluated handover (NEHO):quyt nh HO xy ra bi yu cu ca Network SRNC+Mobile evaluated handover(MEHO):quyt inh thwucj thi xy ra UE,UE sau gi yu cu n RNC1.2)PHN LOI Xt theo th tc: HARD HANDOVER: loi ny , UE ngng kt ni vi cell c v sau thnh lp kt ni mwois cell mi SOFT HANDOVER:loi ny,UE lin tc c iu khin bi 2 hay nhiu NodeB thuc cng mt RNC hay khc RNC , bt buc gia cc RNC phi c giao din Iur v cc Node B hot ng trn cng 1 bng tn s . kt ni c gi lin tc khi xy ra HO : ng xung, UE kt hp cc tn hiu t nhiu Node B vi b thu RAKE ng ln, RNC ch tn hiu t Node B mnh nht SOFTER HANDOVER:l 1 trng hp c bit ca HO,khE i t sector ny qua sector kia ca cng 1 Node B ng xung:UE kt hp tn hiu c thu t 2 cell ng ln, nodeB kt hp tn hiu thu t 2 cell

Hnh 5:phn loi HandoverNu phn loi theo h thng Intra-system Handover: xy ra trong h thng WCDMA , chia lm 2 loi Intra-frequency handover : xy ra gia cc cell c cng tn s sng mang Inter-frequency handover: xy ra gia cc cell hot ng trn nhuwangx di tn sng mng khc nhau Inter-system handover:xy ra cc cell c cng ngh truy nhp mng khc nhau(gia GSM v UMTS)1.3)THNG S

Hnh 6:th tc oKhi mun c bo co v thng s o c trn tn hiu, UTRAN gi yu cu iu khin s o cho UE, UE s bo cc thng s o cHnh (B) A:s o trn knh vt l B:s o sau khi knh vt l i qua b lc C:s o sau khi s li b lc th 3 C:nhng s o khc D:s o s c bo co li thng qua giao din v tuyn/IubNhng thng s quan trng nht l Ec/No(cht lng knh CPICH), RSCP(bc knh CPICH), v RSSI(bc tn hiu cell GSM)1.4.1)soft Handover1.4.1.1)phn bit tp hp v neighbor Active set: l tp hp cc cell m UE lin tc lin lc trong qu trnh soft handover. Candidate set: l tp hp cc cell c Ec/Io ln nhng cha c vo active set. Neighbour set: l danh sch cc cell cung cp cho UE n lin tc o c v gim st.Soft handover l l 1 bc pht trin ni bt ca h thng thng tin di ng th h 3, vi rt nhiu li ch Ti u iu khin cng sut vng kn nhanh, UE lun lun kt ni vi cell mnh nht. m bo tn hiu c truyn lin tc bng cch kt hp cc tn hiu nhn c khi UE di chuyn ra bin cell v tn hiu t 1 cell cung cp th khng m bo. Hn na, li phn tp bng cch kt hp tn hiu trong NodeB hay RNC ci thin cht lng ng truyn ln v v th gim cng sut cn truyn caphn ln cc HANDOVER xy ra vi s di chuyn chm, v trong cng 1 RNC, hoc khc RNC nhng cng tn s sng mang nn u im ca SOFT HANDOVER c pht huy mnh.O cng chim nhiu ti nguyn hn1.4.1.2)cc s kin chnhKhi hot ng, cc o c c UE thng bo v RNC theo chu k .khi RNC so snh v tha iu kin no th s xy ra cc s kin. 1A:RNC a cell vo danh sch Active cell khi Active cell cha y. Vi pilot_Ec/Io l kt qu ca cell ang xt ph ln hn cell mnh nht mt ngng(AS_Th-AS_Th_Hyst) 1B :cell b xa ra khi danh sch active cell Khi Ec/Io ca cell ang xt nh hn cell mnh nht mt khong ngng

1C:Cell khng thuc active set tr nn tt hn cell ang thuc active set, v active set y 1D: thay i cell tt nht. Bo co c kch khi khi c mt cell trong active set tr nn tt hn cell ang tt nht cng thm mt gi tr ngng. 1J:a HSUPA cell trong DCH active set thnh E-DCH active set.bo co c kch khi khi 1 E-DCH khng active m DCH active li tt hn E-DCH active

Hnh7 :minh ha s kin xy ra trong SOFT HANDOVER1.4.1.3)tin trnh Bc 1: UTRAN thng bo cho UE v thng tin ca neighbour cell, srambling code, power trn knh BCH. N cng ging nh BA list trong GSM. Bc 2: UE o c mnh v time delay ca cc cell trong danh sch neighbour Bc 3: UE gi thng tin o c li v cho UTRAN. Bc 4: UTRAN da trn kt qu o c v quyt nh xem c handover hay khng? Bc 5: Nu c handover th UTRAN thng bo cho BS2 iu chnh li nh th cho DPCH thng qua time delay Bc 6: B thu Rake receiver ng b vi knh DPDCH v DPCCH ca BS2. Bc 7: UE ri vo trng thi soft handover vi BS1 v BS2. Bc 8: BS2 c cng tn hiu mnh v UE ngt kt ni vi BS1. V qu trnh handover hon tt.1.4.2) Intra-frequency Hard HandoverKhi gia RNC cng tn s nhng khng c kt ni Iur th HO ny xy raSut qu trnh HO, UE ch c 1 RL.2 tn s ca cell ngun v cell ch ging nhauLi th ca HO loi ny l nng cao hiu sut s dng OVSF v phn cng. tuy nhin n lm rt cuc gi tng1.4.3) Inter-frequency Hard HandoverSng mang ca cell hin ti v cell ch khc nhau. Da vo nhng l do khi to HO , Inter-frequency chia lm 4 loi Coverage-based inter-frequency:khi UE ra khi khu vc ph sng ca tn s hin ti, RNC bt u khi to Coverage-based inter-frequency cho HO QoS_based inter-frequency: da vo thut ton iu khin link n inh(Link Stability Control Algorithm), RNC khi to lo HO ny Load-based inter-frenquency: cn bng lu lng trn cc cell, RNC chn mt s UE thc hin chuyn mng m da trn h s u tin v dch v v ngi s dng Speed-based inter-frequency:khi Ue di chuyn tc thp, UE c HO vo cell ph nh(microcell), nu di chuyn tc ln,UE c HO ra cell c ph ln hn(Macrocell)Cc s kin chnh ca Inter-frequency Hard Handover : 2D:khi cht lng tn hiu hin ti thp hn ngng,UTRAN khi to compress mode v bt u o c trn inter-frequency 2F:khi cht lng tn hiu hin ti cao hn ngng,UTRAN thot compress mode v dng o c trn inter-frequency 2B:khi cht lng tn hiu hin ti thp hn ngng v tn hiu inter-frequency neighbor cao hn ngng, UTRAN khi to inter-frequency HO da trn vng ph 2C:c on cht lng tn hiu inter-frequency neighbor cell cao hn ngng1.4.4) Inter-RAT Hard Handovery l loi chuyn mng gia 2 mng kahcs nhau cng ngh truy nhp mng , c chia lm 2 loi UMTS->GSM handover UMTS->GSM coverage-based handover UMTS->GSM load-based handover UMTS->GSM service-based handover GSM->UMTS handoverVi cch chuyn giao ny,vng ph phc v ca UE tng ln, dung lng cng tng ln cho cc Ue c(2G ln 3G) . tuy nhin n i hi c s tng thch ca UE vi cc th h mng, v cc th tc cng phc tp nhiuCc s kin chnh 2D:khi cht lng tn hiu hin ti thp hn ngng, RNC kch hot compress mode v bt u o c inter-RAT 2F:khi cht lng tn hiu hin ti cao hn ngng, RNC tt compress mode v dng o c inter-RAT 3A:khi cht lng tn hiu dng cho tn s UMTS thp hn ngng, trong khi cht lng mng khc cao hn ngng, RNC kch hot chuyn giao UMTS-GSM da trn vng ph 3C:khi cht lng tn hiu ca cc h thng mng kahcs cao hn ngng, RNC kch hot chuyn giao UMTS-GSM da trn lu lng/dch v

1.4.5) Blind HandoverChuyn giao m :UE c th chuyn mng trc tip n cell ln cn m khng cn o ciu ny ch xy ra vi iu kin 1F: P-CPICH tr nn xu hn gi tr ngng tuyt i. . Bo co c kch hot khi c mt cell mi cng vi gi tr offset ca n thp hn gi tr ngng ty chn tr i gi tr ngng ty chn

Ti liu tham kho1. WCDMA Handover Principle and Relevant Parameters. Operator.com2. CNG NGH3G WCDMA UMTS by tin s Nuyn Phm Anh Dng3. WCDMA RAN Planning and Optimization (Book3(1) Features and Algorithms) by Huawei4. TM HIU V SOFT HANDOVER TRONG WCDMA . bo co hc vic ca Nguyn Quang Tun5. Soft Handover Issues in Radio Resource Management for 3G WCDMA Networks by Yue Chen6. UMTS Networks Architecture, Mobility and Services Second Edition by Heikki Kaaranen