Hoi Thao - Tim Hieu Mang Thong Tin Di Dong 3G

TM HIU MNG THNG TIN DI NG 3G V TRIN KHAI TI VIT NAM

Hi tho chuyn : Tm hiu mng thng tin di ng 3GTRUNG TM THNG TIN DI NG KHU VC IVI GSM

HI THO CHUYN

TM HIU MNG THNG TIN DI NG 3G V M HNH TRIN KHAI TI VIT NAM

Bin son: Nguyn Xun Thon v : i GSM

TP.CN TH 2008MC LCLI M U3Phn 1. TNG QUAN V H THNG THNG TIN DI NG 3G-UMTS.41. Lch s pht trin ca cng ngh mng di ng.42. Cc chun cng ngh cho mng 3G.53. Kin trc mng 3G-UMTS.134. Cc phin bn 3G-UMTS.185. Cc k thut, giao thc v mt s vn khc s dng trong 3G-UMTS.26Phn 2. L TRNH TRIN KHAI NNG CP MNG MOBIFONE LN 3G ALL-IP.281. L trnh ln 3G cho cc mng GSM ti Vit Nam.284. L trnh trin khai nng cp h thng.305. Trin khai ln 3G All IP.35KT LUN.39TI LIU THAM KHO.40THO LUN V CU HI TRC NGHIM

LI M UMng thng tin di ng th h th 3 (3G) c trin khai nhiu nc trn th gii. Ti Vit Nam, B Thng tin v Truyn thng ang n lc chun b cp php trin khai mng 3G trong bng tn 1900-2200 MHz. Cc mng 3G i vo hot ng s l mt ng lc to ln cho s pht trin cng ngh thng tin v truyn thng nc ta, ng thi thc y nn kinh t tng tc hn na. Mc d vy, nhng kin thc v mng 3G c th t ngi vn hnh v khai thc mng quan tm bit n, nht l khi chng ta cn ang th h th 2 GSM. Hi tho ny m ra nhm gii thiu mt ci nhn tng quan nht v cc c tnh ca mng ny v hng pht trin sp ti ca mng chng ta, VMS-MobiFone, nh th no.

Phn 1. TNG QUAN V H THNG THNG TIN DI NG 3G-UMTS1. Lch s pht trin ca cng ngh mng di ng.

Th h u tin 1GTh h in thoi di ng u tin ra i trn th trng vo nhng nm 70/80. y l nhng in thoi anolog s dng k thut iu ch radio gn ging nh k thut dng trong radio FM. Trong th h in thoi ny, cc cuc thoi khng c bo mt. Th h 1G ny cn thng c nhc n vi "Analog Mobile Phone System (AMPS)".Th h th 2G (GSM)Mc thi gian nh du s ra i ca 2G, in thoi k thut s (digital) l u nhng nm 90. Chun k thut s u tin l D-AMPS s dng TDMA (Time division Mutiple Access). Tip theo sau l in thoi 2G da trn cng ngh CDMA ra i. Sau Chu u chun ha GSM da trn TDMA. Ci tn GSM ban u xut pht t "Groupe Speciale Mobile" (ting Php), mt nhm c thnh lp bi CEPT, mt t chc chun ha ca Chu u, vo nm 1982. Nhm ny c nhim v l chun ha k thut truyn thng di ng bng tng 900MHz. Sau ,GSM c chuyn thnh Global System for Mobile Communication vo nm 1991 nh l mt tn tt ca cng ngh ni trn.2001, tng thng lng truyn phc v nhu cu truyn thng tin (khng phi thoi) trn mng di ng, GPRS ra i. GPRS i khi c xem nh l 2.5G. Tc truyn data rate ca GSM ch =9.6Kbps. GPRS ci tin tc truyn tng ln gp 3 ln so vii GSM, tc l 20-30Kbps. GPRS cho php pht trin dch v WAP v internet (email) tc thp.Tip theo sau, 2003, EDGE ra i vi kh nng cung ng tc ln c 250 Kbps (trn l thuyt). EDGE cn c bit n nh l 2.75G (trn ng tin ti 3G)Th h th ba 3GCui nm 2004, in thoi di ng 3G bt u xut hin trn th trng. Tc ca 3G UMTS c th ln n 2Mbps. Vi s kt hp ca HSDPA, tc ny c th ln ti 14Mpbs.2. Cc chun cng ngh cho mng 3G.Khuyn ngh ITU-R M.1457 a ra 5 h tiu chun cng ngh cho giao din truy nhp v tuyn ca thnh phn mt t ca cc h thng IMT-2000 (tn gi mng 3G ca ITU), bao gm: IMT-2000 CDMA Direct Spread IMT-2000 CDMA Multi-Carrier IMT-2000 CDMA TDD IMT-2000 TDMA Single-Carrier IMT-2000 FDMA/TDMA.Vo ngy 31/5/2007, Nhm lm vic 8F ca ITU (ITU WP8F) quyt nh thng qua h tiu chun cng ngh IMT-2000 th 6 vi tn gi l OFDMA TDD WMAN (trc gi l IP-OFDMA). H cng ngh ny da trn tiu chun IEEE 802.16e hay Wimax di ng. Kt qu lm vic ca ITU WP8F cng c Study Group 8 chun y vo thng 7 nm 2007. Tuy nhin vic sa i b sung khuyn ngh ITU-R M.1457 cn cn phi c chnh thc thng qua ti hi nghV tuyn Th gii WRC2007 t chc vo thng 10 & 11 nm nay.Mi tiu chun trong su tiu chun nu trn u c cc cng ty ln v mt s quc gia c nn cng nghip in t, vin thng pht trin ng h v ra sc vn ng. Cc tiu chun ny cnh tranh gay gt vi nhau trong vic chim lnh th trng thng tin di ng. Bi vit ny s tp trung i su vo c im ca tng cng ngh, v th v xung hng pht trin ca n trong ngnh cng nghip vin thng.2.1.IMT-2000 CDMA Direct Spread:Cng ngh IMT-2000 CDMA Direct Spread cn c gi l IMT-DS, ULTRA FDD v c bit n nhiu hn di tn gi thng mi l WCDMA, c chun ho bi 3GPP. Da trn cng gh WCDMA hin c hai loi h thng l FOMA (do NTT DoCoMo trin khai Nht) v UMTS (c trin khai u tin Chu u, sau pht trin ra ton th gii). UMTS l s pht trin ln 3G ca h cng ngh GSM (GSM, GPRS & EDGE), l cng ngh duy nht c cc nc chu u cng nhn cho mng 3G. GSM v UMTS cng l dng cng ngh chim th phn ln nht trn th trng thng tin di ng ngy nay (chim ti 85,4% theo GSA 8-2007).

Mt s c im ch yu ca cng ngh WCDMA bao gm: Mi knh v tuyn c rng 5 MHz Tng thch ngc vi GSM Chip rate 3,84 Mcps H tr hot ng khng ng b gia cc cell Truyn nhn a m H tr iu chnh cng sut da trn t s tn hiu/tp m C th p dng k thut anten thng minh tng dung lng mng v vng ph sng (phin bn HSPA t Release 8 tr ln) H tr nhiu kiu chuyn giao gia cc cell, bao gm soft-handoff, softer-handoff v hard-handoff.UMTS cho php tc downlink l 0,384 Mbps (full mobility) v vi phin bn nng cp ln HSPA Release 6 hin nay, tc ln ti 14 Mbps (downlink) v 1,4 Mbps (uplink). D kin phin bn HSPA Release 8 ra mt vo nm 2009 (thm tnh nng MIMO) th tc tng ng s l 42 Mbps & 11,6 Mbps. UMTS hon ton tng thch ngc vi GSM. Cc my handset UMTS thng h tr c hai ch GSM v UMTS do vy chng c th s dng vi cc mng GSM hin c. Nu mt thu bao UMTS ra khi vng ph sng ca mng UMTS v i vo vng ph sng GSM th cuc gi ca thu bao c t ng chuyn giao cho mng GSM. c bit, trong bng tn 1900-2200 MHz m Vit Nam ang d nh cp php cho 3G th WCDMA l cng ngh duy nht hin nay c thit b sn sng, c nhiu nh cung cp thit b sn xut v c th cung cp ngay khi c n t hng. Mt khc, do quy m th trng ln v l cng ngh trng thnh nn WCDMA cng l mt trong nhng cng ngh c chi ph u t thp nht, em li hiu qu cao nht.Tuy nhin UMTS cng c mt s nhc im. Chuyn giao cuc gi mi ch thc hin c theo chiu t UMTS sang GSM m cha thc hin c theo chiu ngc li. Tn s cao hn mng GSM900 nn s lng trm BTS dy c hn do thi gian xy dng mng lu hn v chi ph cao hn mng GSM. cung cp c dch v Video-on-demand, cc trm gc phi t cch nhau khong 1-1,5km; iu c th thc hin c khu vc th nhng s l khng kinh t khu vc nng thn. 2.2.IMT-2000 CDMA Multi-Carrier:IMT-2000 CDMA Multi-Carrier cn c gi l IMT-MC hay CDMA2000 l cng ngh pht trin ln 3G t h CDMAOne (IS-95) bi 3GPP2. y l cng ngh cnh tranh trc tip vi cng ngh WCDMA trn th trng thng tin di ng.CDMA2000 c cc phin bn CDMA2000-1x (hay 1xRTT), CDMA2000-3x, CDMA2000 EV-DO, CDMA2000 EV-DV.CDMA2000 s dng cc cp sng mang c rng knh 1,25 MHz. Phin bn u tin CDMA2000 1x (hay IS-2000) s dng 1 cp knh v tuyn 1,25 MHz chuyn ti 128 knh lu lng, cung cp tc downlink 144 kB/s. Mc d CDMA2000 1x c cng nhn l 3G nhng nhiu ngi coi n l i din ca mng 2,5G.CDMA2000 3x v CDMA2000 EV-DV s dng 3 knh 1,25 MHz tng tc . CDMA2000 EV-DV c tc downlink ln n 3,1 Mbps v uplink l 1,8 Mbps. Tuy nhin c hai phin bn ny u khng cn c tip tc nghin cu, pht trin thng mi ho do cc nh khai thc CDMA2000 ln nht (nh Sprint Nextel v Verizon Wireless) u la chn phin bn EV-DO. Hin nay cha c mng thng mi no trin khai hai phin bn ny.CDMA2000 EV-DO li c nhiu revision khc nhau: Rev. 0, Rev. A, Rev. B, Rev. C. Tiu chun CDMA2000 EV-DO u tin c gi l Revision 0 c tc downlink ln n 2,4 Mbps v uplink l 153 kbps. CDMA2000 Rev. A c tc ln n 3,1 Mbps downlink v 1,8 Mbps uplink. Rev. B h tr tc uplink ln n 14,7 Mbps (3 knh sng mang). D kin n gia nm 2009 khi Rev. C hay cn gi l UMB ra i (s dng MIMO v OFDMA) s h tr tc downlink ln n 275 Mbps v uplink ln n 75 MBps. Tc ny cho php ngi ta coi UMB l cng ngh ca mng 4G, snh ngang vi LTE ca dng cng ngh HSPA/WCDMA. Cng ging nh HSPDA, cc modem t Rev. A tr ln ca CDMA2000 s dng chipset ca Qualcomm cng c kh nng x l ng thi cuc gi voice bng chuyn mch knh v truy cp d liu bng chuyn mch gi.Hin nay thit b CDMA2000 bng tn 1900-2200 MHz m Vit nam chun b cp php cn cha c sn. Trn th gii mi ch c 1 nh khai thc duy nht l KDDI ca Nht Bn trin khai CDMA2000 bng tn 1900-2200 MHz. Thit b cho mng ny c KDDI t hng ring ca Toshiba nn khng ph bin trn th trng. Thit b CDMA2000 trong bng 1900-2200 MHz c th s ch c sau khi Rev. C (hay UMB) c thng mi ho vo cui nm 2009, u nm 2010. Tuy nhin th trng cho cng ngh CDMA2000 vn nh hn GSM/UMTS nay li ang suy gim. Ti mt s nc, cc nh khai thc CDMA2000 cng ang chuyn hng sang HSPA. Ti Hn Quc, KTF v SK Telecom tuyn b ngng u t vo mng CDMA2000 v bt u t u nm nay chuyn dn khch hng sang HSPA. Ti Australia, Telstra tuyn b s thu hp v ngng hot ng mng EV-DO v chuyn dn khch hng sang mng HSPA. Cc nh sn xut cng khng cn quan tm nhiu n CDMA2000 na. Nokia tuyn b rt khi vic nghin cu pht trin CDMA v ch tip tc kinh doanh cc sn phm CDMA mt s th trng trng im.2.3.IMT-2000 CDMA TDD:H cng ngh CDMA TDD bao gm TD-CDMA v TD-SCDMA. Cng ngh TD-SCDMA do chnh ph Trung Quc ch o Hc vin Cng ngh Vin thng Trung Quc v Cng ty Datang nghin cu, pht trin vi mc tiu khng l thuc vo cng ngh Phng Ty nhm trnh phi tr mt khon ph bn quyn khng nh cho cc sng ch ca cc cng ty u-M ng thi thc y ngnh cng nghip in t-vin thng Trung Quc pht trin. Cng ngh TD-SCDMA cn ang c nghin cu pht trin v cha c nc no ngoi Trung Quc d nh trin khai.TD-CDMA hay cn gi l UMTS-TDD s dng chung mt knh v tuyn 5 MHz cho c ng ln v ng xung. Mi khung thi gian rng 10 ms chia thnh 15 time slot. Cc time slot c phn b cho ng ln v ng xung theo mt t l c nh. Cng ngh truy cp CDMA c s dng trong mi time slot ghp knh cc dng d liu t cc tranceiver khc nhau. Cng ngh TD-CDMA ch yu c s dng truy cp d liu internet bng thng rng ch khng dnh cho thoi. N ch yu c dng cho cc pico-cell v micro-cell c nhu cu d liu ln. Hin nay c khong 20 nc trin khai TD-CDMA cc thnh ph ln. Tuy nhin cng ngh ny cha thc s chn mui v quy m th trng cng nh s lng cc nh cung cp thit b cn nhiu hn ch.2.4.IMT-2000 TDMA Single-Carrier:Cng ngh TDMA Single-Carrier cn c gi l WUC-136, c pht trin t tiu chun IS-136 TDMA. N s dng cc knh c rng 30 KHz, 200 KHz v 1,6 MHz. Cng ngh ny vn cn ang giai on nghin cu pht trin, cha c h thng no c trin khai thng mi, do cng t c kh nng chim lnh th trng.2.5.IMT-2000 FDMA/TDMA:Cng ngh ny cn c tn gi l DECT. N c ETSI pht trin v c trin khai mt s nc chu u, chu v chu M cho cc h thng in thoi khng dy tng i c quan (PBX) v in thoi v tuyn ni th cng cng. Do c cng sut nh, vng ph sng hp (maximum 0,25W) nn cng ngh ny khng thch hp cho vic ph sng ton quc n cc vng nng thn.IMT-2000 OFDMA TDD WMAN:Cng ngh ny da trn tiu chun 802.16e-2005 hay cn gi l Wimax di ng. N c IEEE pht trin v ang c th nghim trin khai mt s nc. Mobile Wimax c mt s c im c bn nh sau: Thit k mng da trn cu trc All-IP Knh v tuyn c rng 3.5, 5, 7, 10, 20 MHz; song cng TDD S dng iu ch OFDMA Tn s 2.3; 2.5; 3.5 GHz T CW2 (2008) tr ln s h tr ngten thng minh (MIMO) Tc (CW2) DL = 37.4 Mbps; UL=10 Mbps.Cng ngh Wimax ang c kh nhiu cc cng ty tham gia pht trin, c bit l cc cng ty ang chim th phn khim tn trong mi trng thng tin di ng nh Nortel hay Motorola. Wimax l cng ngh c tim nng cnh tranh cao trong vic cung cp dch v truy cp khng dy bng rng. Hin nay Wimax forum c ti 469 thnh vin (7/2007) l cc nh sn xut chip/linh kin; cc nh cung cp thit b, cc nh cung cp dch v v cc nh cung cp ng dng.Tuy nhin Mobile Wimax cng c mt s nhc im. Bng tn cho Mobile Wimax khng c thng nht cao trn ton cu nh UMTS nn quy m th trng b phn mnh, dn n chi ph sn xut cao, thit b c gi thnh cao. Cng ngh Wimax c pht trin t con s 0 nn khng tng thch vi bt k cng ngh no c trc . Ngoi ra, vic pht trin Wimax xut pht t nhu cu cung cp dch v d liu bng rng khng dy nn chi ph cung cp dch v thoi qua mng Wimax di ng l kh tn km trong khi nhu cu ch yu ca ngi tiu dng hin nay vn l thoi (80-90% lu lng ton mng), s lng ngi s dng laptop v PDA vn cn kh t.Quan trng hn c l cng ngh Wimax khng c mt bng tn 1900-2200 MHz ang c chun b cp php Vit Nam.Cng ngh no cho mng 3G Vit Nam?Nh phn tch trn y ta thy rng bng tn Vit Nam ang chun b cp php (1900-2200 MHz) hin ti mi ch c cng ngh WCDMA l sn sng. Cc cng ngh khc, k c CDMA2000-1x EV-DO l cha sn sng on bng tn ny vo thi im thng 9/2007. Cng ngh EV-DO sm nht cng ch c kh nng c mt bng tn 1900-2200 MHz vo nm 2010 khi Rev. C c thng mi ho.Mc d mt s nc trn th gii cp php bng tn 3G theo tiu ch c lp v cng ngh (khng gn vic cp bng tn vi bt k cng ngh no) nhng thc t trin khai nhiu nc cho thy trong bng tn 1900-2200 MHz, cng ngh WCDMA/HSPA vn l cng ngh ch o, c a s cc nh khai thc la chn. Quy m th trng ln ca cng ngh ny cng m bo rng n s c tip tc pht trin trong tng lai.3. Kin trc mng 3G-UMTS3.1. Cc c tnh v tuyn ca mng 3G-UMTSCc thng s tiu chun cho giao tip v tuyn WCDMA FDD nh sau:- Ch truy nhp:WCDMA FDD- Bng tn:1920 - 1980 MHz; 2110 - 2170 MHz- rng sng mang: 5 MHz- Tc tri ph: 3,84 Mbps- Chuyn giao cng mt tn s: Soft Handover- Chuyn giao gia hai tn s: Hard Handover- iu khin cng sut: 1,5 KHzCc thng s tiu chun cho giao tip v tuyn WCDMA TDD nh sau:- Ch truy nhp: WCDMA TDD- Bng tn: 1900 - 1920 MHz; 2020 - 2025 MHz- rng sng mang:5 MHz- Tc tri ph:3,84 Mbps- iu ch:QPSK- Chuyn giao cng mt tn s: Hard Handover- Chuyn giao gia hai tn s: Hard Handover- iu khin cng sut:ng ln: 200 Hz, ng xung: 800Hz3.2. Cc thnh phn mng tip tc tm hiu v UMTS, chng ta s tm hiu xem kin trc mng UMTS bao gm cc thnh phn no. Hnh sau y m t kin trc c bn ca mng 3G-UMTS.

Mng UMTS bao gm 2 phn, phn radio access (UTRAN) v phn core (CN). Radio access bao gm Node B, RNC. Cn phn core th c core cho data bao gm SGSN, GGSN. Phn core cho voice th c MCS v GMSC. Hnh trn cng th hin r lm th no GSM/GPRS kt ni vo UMTS core (BTS v BSC).Node B: Chc nng chnh ca Node B l x l lp vt l (L1) giao din v tuyn nh m ha knh, an xen, tri ph, iu ch... N cng thc hin mt chc nng ti nguyn v tuyn nh iu khin cng sut vng trongRNC: Trong trng hp Node B ch c mt kt ni vi mng th RNC chu trch nhim iu khin Node B c gi l CRNC. Ngc li, khi Node B c hn mt kt ni mng th cc RNC c chia thnh hai loi khc nhau theo vai tr logic ca chng. RNC phc v (Serving RNC): y l RNC kt ni c ng lu lng v bo hiu RANAP vi mng li. SRNC cng kt cui bo hiu iu khin ti nguyn v tuyn gia UE v UTRAN, x l s liu lp 2 (L2) t/ti giao din v tuyn. SRNC ca Node B ny cng c th l CRNC ca mt Node B khc. RNC tri (Drift RNC): y l RNC bt k khc vi SRNC, iu khin cc c MS s dng. Khi cn, DRNC c th thc hin kt hp v phn chia phn tp v m. DRNC khng thc hin x l lp 2 i s liu t/ti giao din v tuyn m ch nh tuyn s liu mt cch trong sut gia cc giao din Iub v Iur. MtUE c th khng c hoc c mt hay nhiu DRNC.SGSN = Serving GPRS Support Node. Trong mng li GPRS ca 1 operator c nhiu SGSN ch khng phi ch c 1. Mi SGSN kt ni trc tip vi 1 s RNC. Mi RNC li qun l 1 s Node B, v mi node-B s c mt s UE ang ni kt. SGSN qun l tt c cc UE ang s dng dch v data trong vng ca n. Vi tr ca SGSN l: Authenticate (xc minh) cc UE ang dng dch v data ni kt vi n Qun l vic ng k ca 1 UE vo mng GPRS (data). Qun l qu trnh di ng ca UE. C th l SGSN phi bit l UE hin ang ni kt vi thng Node-B no ti mt thi im. Ty theo UE ang mode active (ang lin lc) hay idle (khng lin lc) m chnh xc ca thng tin lin quan n v tr UE s khc nhau. SGSN s phi qun l v theo di s thay i v tr (location area identity/ routing area identity) ca UE theo thi gian. To dng, duy tr v gii phng cc "PDP context" (cc thng tin lin quan n connection ca UE m n cho php/qui nh vic gi v nhn thng tin ca UE) Nhn v chuyn thng tin t ngoi mng data (Internet chng hn) n UE v ngc li. Qun l vic tnh tin (billing) i vi cc UE. Tm v nh thc idle UE khi c cuc gi tm n UE (paging)GGSN= Gateway GPRS Support Node . Nh ng tn gi ca n, n l mt ci gateway gia mng GPRS/UMTS v cc mng ngoi (external network, nh Internet chng hn, cc mng GPRS khc). Vi tr ca n: Nhn v chuyn thng tin t UE gi ra ngoi mng external v ngc li t ngoi n UE. Packet thng tin t SGSN gi n GGSN s c "decapsulate" trc khi gi ra ngoi v thng tin truyn gia SGSN v GGSN l truyn trn 'GTP tunnel'. Nu thng tin t ngoi n GGSN gi n mt UE trong khi cha tn ti PDP context, th GGSN s yu cu SGSN thc hin paging v sau s thc hin qu trnh PDP context chuyn cuc gi n UE. Trong sut qu trnh lin lc thng qua ni kt mng UMTS, UE s ch connect vi 1 GGSN (m GGSN ni kt vi dch v m UE ang dng). D c di chuyn i u i na, GGSN vn khng i. D nhin l SGSN, RNC v Node-B s thay i. GGSN cng tham gia vo qun l qu trnh di ng ca UE. 3.2. Cc giao din.Giao din IubGiao din Iub l mt giao din quan trng nht trong s cc giao din ca h thng mng UMTS. S d nh vy l do tt c cc lu lng thoi v s liu u c truyn ti qua giao din ny, cho nn giao din ny tr thnh nhn t rng buc bc nht i vi nh cung cp thit b ng thi vic nh c giao din ny mang ngha rt quan trng.c im ca giao din vt l i vi BTS dn n dung lng Iub vi BTS c mt gi tr quy nh. Thng thng kt ni vi BTS ta c th s dng lung E1, E3 hoc STM1 nu khng c th s dng lung T1, DS-3 hoc OC-3. Nh vy, dung lng ca cc ng truyn dn ni n RNC c th cao hn tng ti ca giao din Iub ti RNC. Chng hn nu ta cn u ni 100BTS vi dung lng Iub ca miBTS l 2,5 Mbps, bit rng cu hnh cho mi BTS hai lung 2 Mbps v tng dung lng kh dng ca giao din Iub s l 100 x 2 x 2 = 400 Mbps. Tuy nhin tng ti ca giao din Iub ti RNC vn l 250 Mbps ch khng phi l 400 Mbps.Giao din IurTa c th thy r v tr ca giao din Iur trong cu hnh ca phn t ca mng UMTS. Giao din Iur mang thng tin ca cc thu bao thc hin chuyn giao mm gia hai Node B cc RNC khc nhau. Tng t nh giao din Iub, rng bng ca giao din Iur gn bng hai ln lu lng do vic chuyn giao mm gia hai RNC gy ra.Giao din IuGiao din Iu l giao din kt ni gia mng li CN v mng truy nhp v tuyn UTRAN. Giao din ny gm hai thnh phn chnh l: Giao din Iu-CS: Giao din ny ch yu l truyn ti lu lng thoi gia RNC v MSC/VLR. Vic nh c giao din Iu-CS ph thuc vo lu lng d liu chuyn mch knh m ch yu l lng ting. Giao din Iu-PS: L giao din gia RNC v SGSN. nh c giao din ny ph thuc vo lu lng d liu chuyn mch gi. Vic nh c giao din ny phc tp hn nhiu so vi giao din Iub v c nhiu dch v d liu gi vi tc khc nhau truyn trn giao din ny.4. Cc phin bn ca 3G-UMTS.UMTS l h thng vin thng di ng ton cu ca Chu u da trn cng ngh WCDMA. Mc ch ca UMTS l cung cp cho ngi s dng thng tin c nhn truy nhp vo gii bng rng s dng cc mi dch v mi. UMTS cung cp thng tin cc nhn di ng multimedia nh hng. ng UTMS cung cp cc dch v roaming ton cu. UMTS c thng mi ha Nht v Chu u. Nht, mu cht l tng yu cu ca dch v multimedia v kh nng s dng cc ng dng d liu tc cao.UMTS kt hp cng ngh mi vi h thng v cc dch v ca GSM hin ti. ERC quy nh ph mi trn bng tn mi 2 GHz i vi mt t.Ph ny bao gm: Bng tn kp (1929-1980 MHz + 2110-2170 MHz). Bng tn n (1910-1920 MHz + 2010-2025 MHz).

Di ph trn c la chn c Chu u v Nht Bn. Cn Bc M th rt tic n c s dng cho cc h thng PCS.C hai ch c nh ngha l FDD v TDD. C hai ch u l CDMA bng rng (WCDMA) vi rng knh v tuyn l 5MHz v c pht trin nhm s dng ti a hiu qu v li ch ca CDMA.TD/CDMA c s dng trn bng tn n. Li ch ca TD/CDMA l kh nng qun l lu lng khng song cng ( lu lng gia ng ln v ng xung khc nhau). Bi TD/CDMA c ng ln v ng xung trn cng mt bng tn ch phn cch v mt thi gian, nn i vi vic truyn s liu khng cn bng gia ng ln v ng xung, hiu quang ph ca TD/CDMA s cao hn so vi WCDMA (n nh hai bng tn ring cho ng ln v ng xung). Ly v d Internet l in hnh, rt nhiu thng tin c ti xung t trang Web m rt t thng tin c gi i.Tng qut t 2,5G (GPRS/EDGE) pht trin ln UMTS:Thc hin

MiGiao din v tuyn WCDMA (UE, Node B)Giao din mng truy nhp v tuyn RAN (Iub (Node B-RNC) v Tur (RNC-RNC))Giao din mng li: Iu (MSC-RNC v SGSN-RNC).

iu chnhMSC v SGS cho giao din TU

Gia nguynMng li chuyn mch knh(HLR-AuC)Mng li chuyn mch gi (GGSN)

3GPP xc nh con ng pht trin ca GSM ln UTMS (WCDMA):Mng li pht trin t GSM-only nhm h tr c GPRS v cc thit b WCDMA mi. 3GPP Release 99: Thm phn v tuyn 3G. 3GPP Release 4 : Thm chuyn mch mm cc gateway thoi v li chuyn mch gi. 3GPP Release 5 : Cung cp cc dch v multimedia IP (IMS) v QoS. 3GPP Release 6 : Mng All IP, ang c chun ha.4.1. Release 99

Hnh 4.1 : Kin trc mng 3G Release 99.+ V giao din v tuyn: Phn mng truy nhp v tuyn mi UTRAN(WCDMA) c thm cc thnh phn RNC v BC. Vic c nng cp giao din v tuyn hin c ca GSM ln EDGE (E-RAN) hay khng l ty chn ca nh khai thc.+ MSC/VLR nng cp c th x l c cho phn v tuyn bng rng.+ cc dch v IN c th cung cp cho cc mng tm tr cu thu bao cn trin khai CAMEL.+ Kt ni truyn dn trong mng truy nhp v tuyn WCDMA dng ATM nhm h tr cc loi hnh dch v khc nhau: cc dch v tc khng i cho chuyn mch knh v v cc dch v c tc thay i i vi chuyn mch gi. + Cc nt li c chuyn i: Phn CS phi qun l c thu bao 2G v 3G, i hi thay i trong MSC/VLR v HLR/AuC/EIR. Phn PS c nng cp t GPRS, thay i SGSN l ln nht.- Mng cung cp cc loi dch v 3G v dch v ging vi mng 2,5G, hu ht cc dch v c chuyn sang dng gi khi c nhu cu. V d WAP s chuyn sang dng chuyn mch gi. Dch v da trn v tr gip truyn d liu gi hiu qu hn.- u im:+ Tn dng ti a h tng GSM/GPRS hin c: C th trin khai nhanh chng. Ch tiu cc phn t mng rt n nh.+ Cung cp c dch v 2G v 3G, dch v chuyn mch knh v gi.+ Bo m an ton u t: Thit b nng cp dn dn ti mng li 3G.- Nhc im:+ Phc tp do c hai thnh phn CS v PS.+ Phn CS phc tp do phi phc v c 2G v 3G, kh m rng.+ Vic qun l h thng s phc tp.- Khc phc: Bc pht trin tip theo sau 3GPP R99 ch ra cc xu hng chung. l tch phn kt ni cuc gi, phn iu khin v phn dch v, ng thi chuyn i mng theo hng hon ton trn c s IP.4.2. Release 4

Hnh 4.2 : Kin trc 3G Release 4.im khc bit chnh ca Release 4 v Release 99 l mng li phn b. MSC c chia thnh MSC sever v MGW. 3GPP Relesae 4 tch phn kt ni, iu khin v dch v cho chuyn mch knh mng li.MSC sever c chc nng qun l di ng v iu khin cuc gi, khng cha ma trn chuyn mch, phn t iu khin MGW. Cn Media Gateway (MGW) l phn t chi trch nhim duy tr cc kt ni v thc hin chc nng chuyn mch khi cn.Thoi chuyn mch gi (VoIP): cuc gi chuyn mch knh c chuyn sang chuyn mch gi trong MGW.- u im: + Khc phc mt s nhc im ca R99.+ Tch ring phn kt ni cuc gi, phn iu khin v phn dch v cho phn chuyn mch li chuyn mch knh.+ Ton b lu lng qua MGW, c qun l nng MSC Sever tch ri ( nng cp t MSC/VLR).+ Phn CN CS c th t do m rng khi dung nhiu MGW.+ Cho php truyn ti lu lng hiu qu hn nh chuyn mch gi. Mt cuc gi GSM truyn thng s c thay bng VoIP qua MGW. Phn h a phng tin IP(IMS) c thm vo p ng cc dch v a phng tin trn IP v VoIP.- Nhc im: + Lm thay i cn bn phn CS nhng vn cn c hai thnh phn CS v PS.+ Vai tr ca CAMEL s thay i, phi lp kt ni vi phn PS v s tr thnh yu t u ni gia h tng dch v v mng.4.3. Release 5

Hnh 4.3 : Kin trc 3G Release 5.c im ca Release 5 l thm min IP a phng tin trong mng li (IM), h tr d liu v thoi qua IP, trong b sung mt phn t mi: CSCF: Qun l vic thit lp duy tr v gii phng cc phin truyn a phng tin vi ngi s dng. MRF: H tr cc chc nng nh cuc gi nhiu bn, cuc gi hi ngh.Ngoi ra, SGSN v GGSN c ci tin so vi R4 l c h tr thoi. MGW vn c chc nng tng t nh R$ v MGW do MGCF iu khin.- u im : +Tn ti duy nht chuyn mch gi PS.+ S dng hiu qu v d dng qun l ton b lu lng trn mng 3G v u l IP.+ Cng ngh truy nhp v tuyn s gim dn t trng. Trong tng lai, cc li 3G s c nhiu cng ngh truy nhp v tuyn khc nhau.Mt s vn cn xem xt thm: + Cng ngh cha chn mui, cn ch tiu chun v h thng n nh.Mi trng thng ch o (VHL): p ng yu cu hi t cc mng di ng, c nh v Internet. Cho php cc thu bao c cung cp dch v nh ang mng thng tr k c khi roaming.+ Qun l cht lng dch v do IP l dch v best effort.+ Bo mt IPv6, IP-VPN.+ M rng khng gian a ch IPv6+ c tnh kt ni v tuyn khc hu tuyn.+ Tnh di ng u cui.4.4. Release 6Mc ch chun ha ca 3GPP Relesae 6 l:+ Cung cp cc dch v a phng tin IP, pha 2: Nhn tin IMS v qun l nhm.+ Hot ng phi hp vi mng LAN v tuyn.+ Cc dch v ging ni: Nhn dng ging ni phn b (DSsR).+ Phm vi v nh ngha ang tip tc c tiu chun ha.4.5. Cu trc mng 3G ton IPTip theo th h 2.5G v 3G, mng li ton IP ang xut hin vi nhiu kh nng ng dng cao, cc dch v thoi v s liu c h tr qua mng li ton IP. Cc mng a phng tin ton IP c thit k cho cng ngh bu chnh nh CDMA2000, UMTS. Trong cu trc mng 3G ton IP, d liu c thit lp mang cc gi IP gia cc sever kt ni mng v cc thit b u cui. Mng s dng cc Tunnet h tr vic lu chuyn. Trong UMTS, Tunnet t sever truy nhp mng c nh tuyn thong qua mt h chuyn mch tunnet. Thit b u cui c th di chuyn gia cc trm thu pht v trm iu khin m khng cn chuyn cc chuyn mch tunnet m ch cn mt nhnh ca tunnet. Thit b u cui c th di chuynn ti mt mng truy nhp c iu khin bi mt chuyn mch tunnet khc bng vic di chuyn cc nhnh ca tunet m khng cn lu chuyn phn d liu. Kin trc mng 3G-All-IP th hin hnh di dy:

5. Cc k thut, giao thc v mt s vn khc trong 3G-UMTS(Khng trnh by trong khun kh hi tho ny, s m ra cho tt c mi ngi tm hiu v trnh by trong cc trong cc hi tho tip theo)5.1. Cc k thut s dng trong 3G-UMTSMt s k thut chnh dng trong 3G-UMTS nh sau: WCDMA, iu khin cng sut, b thu RAKE, chuyn giao cng, chuyn giao mm, .5.2. Cc giao thc s dng trong 3G-UMTS Lm th no thc hin mt cuc gi Lm th no paging mt UE - Lm th no thc hin cuc gi roaming Giao thc selection, re-selection v khi nim RRC connection Cc giao thc chuyn giao Khi nim PDP context, GPRS attach/detach, kch hot PDP context Qun l di ng trong GPRS (paging, localisation update) Qun l di ng gia SGSN v GGSN5.3. Mt s vn khc trong 3G-UMTS Qun l v phn chia ti nguyn radio, Quy hoch mng Bo mt

Phn 2. L TRNH TRIN KHAI NNG CP MNG MOBIFONE LN 3G ALL-IP1. L trnh ln 3G cho cc mng GSM ti Vit NamSong song vi s pht trin v s lng thu bao l t trng sn lng ngy cng tng ca cc dich v s liu so vi dch v thoi. Theo xu hng chung hin nay trn th gii cng nh Vit Nam, cc dch v thoi ngy cng gim dn, trong khi cc ca cc dch v s liu khng ch ph thuc vo thi gian s dng dch v hoc dung lng s liu truyn trn mng m cn ph thuc vo tnh cht cng nh ni dung ca tng loi dch v v khng c chiu hng gim. Cc loi dch v s liu s c cung cp khng ch bi nh khai thc m cn bi nhiu nh cung cp khc, tc doanh thu cc nh khai thc mng s b san s bt, nu nh khai thc mng khng ch trng t pht trin v cung cp cc dch v s liu. V vic quan tm n cc dch v s liu l xu hng t nhin c cc nh khai thc mng.Nm 2005, tt c cc thu bao s vn tip tc s dng cc dch v s liu truyn thng. S liu thu bao s dng cc dch v s liu mi da trn nn cng ngh GPRS chim khong 5% vo nm 2003, 15% vo nm 2004, v tng 30% nm 2005. D bo n nm 2010 lu lng ch yu trong ton mng s l ca cc dch v s liu, lu lng thoi s ch cn chim mt t l khng ng k v c truyn chung trong mi trng IP (VoiIP).Trong xu th chung cu s pht trin cc dch v thng tin di ng trn ton th gii, cc dch v s liu sau s c trin khai trong cc mng ca Tng cng ty n 2010: Truyn nh, in thoi di ng thy hnh (videofone) Thanh ton trc tuyn qua mng (online banking) Truy nhp Internet s dng cc thng tin trong mng Internet Cc dch v gii tr (games) Cc dch v nh v (location services) v.v.Khng nh dch v thoi, cc dch v s liu (nht l cc dch v s liu cn tc cao) yu cu mt mng li c thit k, xy dng v ti u ha mt cch cng phu, c cht lng, nht thit phi nng cp v cng ngh v phi lp t thm cc h thng cung cp dch v. V vy, mt k hoch pht trin cc dch v s liu trong cc mng di ng c VNPT xy dng v tng bc trin khai ngay t by gi. Cc dch v s liu trong giai on ny s gn lin vi vic trin khai cng ngh 2.5G v 3G. Hin nay trong cc mng Vinafone v Mobifone, Viettel trin khai h thng GPRS v cung cp mt s dch v lin quan. pht trin mng thnh cng v t c hiu qu kinh t cao th vn d bo nhu cu v cc loi hnh dch v l yu t tin quyt. V vy i hi cc nh khai thc phi xem xt cng nh c cc bn d bo kh chnh xc qui m ln.Theo d bo nhu cu trn, nc ta, s thu bao c nhu cu dch v d liu chim khong 15% nm 2004 v tng nhanh n khong 40% vo nm 2010. Tuy nhin, phn ln nhu cu l dch v d liu trung bnh m h thng 2,5G c th p ng c, dch v ch cht l th in t v nhn tin a phng tin. Nhu cu dch v d liu a phng tin cao cp nm 2004 v tng kh chm sau .Theo d bo ban u th dch v in thoi truyn hnh di ng s l dch v ch cht ca cc h thng 3G/4G. Tuy nhin, nhng mng th nghim c trin khai gn y trn th gii cho thy tc truyn d liu khng t nh mong mun v ph thuc rt nhiu vo s thu bao ang lin lc trong cell. Tc 2 Mbps l khng t c, tr khi my di ng ngay gn Anten trm gc v ch c mt mnh n lin lc trong cell . Dch v in thoi truyn hnh khng th cung cp c vi cht lng tt, dch v ch cht gi y c d bo l nhn tin a phng tin v truyn nh tnh, nhng dch v ny li i hi s hiu bit v cng ngh thng tin ca c nh cung cp v ngi s dng.Trong tng lai, xu hng pht trin s nhm p ng cc mi trng lm vic linh hot, hot ng giao dch kinh doanh ng s tng nhu cu s dng thng tin s liu trn mng di ng. Nh vy, ch l vn thi gian i vi vic thng tin s liu trn mng di ng tr thnh mt lnh vc kinh doanh mng v hiu qu. Tt nhin chi ph, gi thnh v d s dng s l cha kha cho s thnh cng ca cc dch v s liu.2.L trnh trin khai nng cp h thng ln 3G ca VMS-MobiFone2.1. S ra i ca h thng thng tin di ng GSM l mt bc nhy vt ca lnh vc thng tin, mang li cho ngi s dng nhiu li ch kh c th ph nhn. Cng vi s pht trin ca khoa hc k thut hin i, s i mi cng ngh, thng tin di ng cng ngy cng i mi theo chiu hng pht trin. Trong tin trnh ca s pht trin khng ngng , xu th trin khai pht trin mng 3G l mt xu th tt yu, ang dn c trin khai nhiu nc trn th gii. Vi nhiu h thng tin di ng th h 2 hin dang tn ti, vic trin khai v hi t ti mt cng ngh duy nht 3G l cc k kh khn. Ngi ta a ra cc l trnh khc nhau cho cc cng ngh 2G hin ang tn ti. i vi GSM, y l cng ngh ph bin trn ton cu nn cc nh sn xut cc t chc tiu chun th gii cng c bit ch trng trn vic nng cp ln 3G.ng trc tnh hnh th trng cng nh h tng c s mng thng tin di ng Vit Nam cha tht s ln mnh, vic pht trin h thng thng tin di ng Vit Nam to ra bc t ph trong nghnh cng nghip vin thng. Trong giai on ny, cht lng dch v thoi truyn thng vn l mi quan tm hang u ca khch hng. Bn cnh , s a dng v dch v phn no p ng c nhu cu ca khch hng.Tuy nhin, s pht trin nhanh chng cc dch v s liu m trc ht l s bng n ca Internet trong nhng nm gn y i hi cc nh khai thc mng thng tin di ng Vit Nam, trong c nh khai thc mng MobiFone phi c nhng mc tiu chin lc, ph hp vi hon cnh ring ca nc mnh pht trin ln h thng thng tin di ng th h ba.Th nht, mng MobiFone c xy dng trn c s GSM. Ngoi gii ph 900, gii ph 1800 tht s cn thit tng dung lng. Bn cnh , vic thit k v quy hoch mng nhm nng cao cht lng mng, vic thng xuyn nng cp v m rng mng nhm p ng nhu cu th trng v s pht trin cng ngh trn th gii lun dng vai tr cc k quan trng. Th hai, thit b trn mng MobiFone ch yu do ba nh cung cp l Alcatel, Eicsson v Huawei. y l nhng nh cung cp hng u v thit b vin thng, trong phi c bit k n thit b mng thng tin di ng. Trong tin trnh pht trin khng ngng v mt cng ngh thng tin di ng trn th gii, Alcatel, Eicsson v Huawei c s nghin cu, phn tch v cng chn cho mnh mt xu hng pht trin : GSM GPRS/EDGE WCDMA.T nhng l lun trn, l trnh pht trin ca mng MobiFone t GSM tin ln th h th ba WCDMA l hp l:Da trn nn tng sn c v th trng v c s tng i mnh ca GSM, mng GSM hon ton hi t iu khin tin ha ln cc h thng thng tin di ng 2,5G (GPRS/EDGE) v 3G (WCDMA) m vn khai thc ti nguyn sn c ca mng li, tn dng ti a hiu qu ca thit b u t.V my u cui, s dng cc my u cui hai ch WCDMA/GSM vi GSM tn dng vng ph sng v vi WCDMA s dng cc tnh nng dch v mi MobiFone s c th khai thc cc dch v bng rng trn GSM mt cch trong sut. Ni chung s c rt nhiu my u cui ra i l s kt hp ca cc tiu chun cng ngh khc nhau nhm mc ch nh mt cu ni gia cng ngh. y chnh l mt yu t tng trinh thnh ca khch hng i vi mng li v tnh cnh tranh.

Hnh 3.3 : L trnh trin khai nng cp mng MobiFone ln 3G.2.2. Theo d on ca cc chuyn gia, cho n nay v cng c th vi nm ti dch v thoi truyn thng s vn ng vai tr ch cht v bnh cnh l s tng trng ngy cng ln mnh v nhu cu dch v s liu, in hnh l dch v nhn tin trn th trng Vit Nam. Do vy, s pht trin song song gia dch v thoi v dch v phi thoi s tt yu tn ti trong mt thi gian di.2.3. GPRS s l cu ni gia h thng thng tin di ng th h 2 v th h th 3. Vic u t h thng GPRS l thc s cn thit nhm tng bc trin khai h thng thng tin di ng th h 3 trn mng. y cng l xu hng tt yu cc nh khai thc thng tin di ng phi thc hin nhm gia vng th trng v tng cng kh nng cnh tranh.GPRS c mt s li ch nh sau:i vi nh khai thc:+ Gim chi ph u t: Mt trong nhng gii php tt ti u v mt cng ngh ca mng GSM l c kh nng cung cp (truyn s liu tc cao) m khng phi xy dng mt mng hon ton mi. Thng qua vic trin khai GPRS, nh khai thc dch v c th nng cp h thng GSM ca mnh tin ti mt h thng thng tin di ng th 3, bi GPRS cho php cng tn ti song song vi mng GSM, tn dng ti a kh nng v ngun ti nguyn ri ca thit b hin c trn mng GSM.+ Sau khi trin khai GPRS, vic tnh cc s dng dch v ca khch hng c thi gian truy cp h thng hoc da theo nguyn tc theo thi gian tnh theo dung lng d liu c truyn qua h thng hoc kt hp c hai phong php. iu ny lm cho dch v thng tin di ng cng tr nn hp dn khch hng, khng nhng p ng nhu cu s dng dch v tc cao ca khch hng m cn cung cp kh nng la chn v ph s dngao cho ph hp. chnh l tnh mm do v linh hot trong phng n tnh cc s dng dch v mi v GPRS h tr.+ Thng qua GPRS, nh cung cp dch v c c hi tt khai thc th trng ng dng mi. T c th nng cao doanh thu v li nhun.+ Vi nhiu tnh nng ng dng s hp dn khch hng mi v tng long trung thnh ca khch hng c.+ Nng cao hiu qu s dng v tuyn thng qua vic phn b knh linh hot.+ Giao din tiu chun v m, c th d dng tch hp cc thit b ca cc nh cung cp khc nhau.+ Bng thng rng ca GPRS c th dt ti 50kbps ph thuc vo dung lng ti ca mng li v thit b u cui.i vi ngi s dng:+ GPRS cho php ngi s dng lun truy nhp trng thi Online.+Tc truyn d liu tc cao c th t ti 115Kbps. Do c th nhn v gi Email ngay lp tc.+ C th d dng thit lp kt ni.+ C th s dng ngun thng tin di do thng qua h tr cho a giao thc bao gm c giao thc IP.+ Vn c th gi v nhn cuc gi, nhn v gi SMS m khng nh hng ti vic s dng GPRS truy nhp thng tin.+ Ch phi tr cc cho d liu thay i, khng phi tr cc cho thi gian truy nhp.C th khng nh mng th h 2,5G s pht trin trong mt thi gian di. GPRS s c m rng khp trn ton quc dn dn c c s chp nhn ca khch hng i vi cc dch v phi thoi.2.4. Tip theo vic trin khai GPRS s l EDGE nhm tng kh nng truyn s liu ln 384Kbps c kh nng cung cp cc dch v t i t, dch v nh v trn bn , dch v truy cp thng tin d liu, gii tr Thun li ca vic trin khai EDGE l:Trc ht, EDGE khng cn s dng bng tn mi. Da trn c s hng tng sn c ca trin khai GPRS, vic pht trin ln giai on EDGE tit kim c chi ph u t. Do ch thay i k thut iu ch v tuyn 8-PSK nn EDGE vn gi nguyn cu trc ca mng c m ch cn nng cp phn mm v thm cc TRX mi c kh nng EDGE.EDGE l con ng tin ha ti th h th ba v cng l mt b tr cho WCDMA. EDGE tng cng c cc kh nng truyn s liu ca mng GSM/GPRS, h tr tc s liu ln ti 384Kbps mt tc s liu ca th h ba. Do vy, c th ni EDGE s to mt bc m quan trng tin ti mng WCDMA.Tuy nhin, s phn khng ca khch hng vi dch v s liu trn nn cng nghip chuyn mch gi ca GPRS (truy cp Internet, Entrannet, MMS, WAP, Games Online) s l yu t quyt nh con ng pht trin tip theo ca h thng. Nu nhu cu v dch v s liu ca khch hng tng trng mng m, c th giai on pht trin ln EDGE c b qua.2.5. T y, vi ti nguyn tn s 3G sn c, vic trin khai WCDMA trn nn h thng GSM l hon ton ph hp vi quy lut t nhin. Trn c s ca mng li GPRS c pht trin, vic xy dng h thng WCDMA v c bn l xy dng phn cng cho mng truy nhp v tuyn UTRAN gm RNC v Node B. Mt iu chc chn l WCDMA cha th trin khai ti tn vng xa, m trc mt s tp trung pht trin mt s thnh ph ln nh H Ni, Hi Phng, Nng v Thnh Ph H Ch Minh. Khi , my u cui ca khch hng s c kh nng tng thch gia hai h thng GSM v WCDMA.Nh vy, l trnh pht trin t GSM ln WCDMA theo cng ngh WCDMA tng i r rng m bo s kt hp cng tn ti gia mng GSM hin ti v mng 3G ng thi cng tn dng c rt nhiu li th ca mng GSM hin c nh li th v s thu bao ang c, thi quen ca khch hng v s dng cc dch v truy nhp Internet khi trin khai GPRS v li th trong trin khai roaming quc t. Hin nay s lng tu bao GSM ngy cng pht trin nhanh v chim th phn rt ln trong tng s thu bao di ng, iu cho thy khi la chn l trnh i ln WCDMA da trn cng ngh WCDMA cng s to ra li th trong vic trin khai roaming quc t. Ngoi ra, vic la chn WCDMA lm nh hng cng ngh WCDMA cn c mt li th nh sau:+ Hiu qu s dng ph rt cao.+ Cho php s dng cc my u cui c cng xut thp.+ Cho php cung cp cc ng dng khc nhau vi cc tc truyn s liu khc nhau.Ton b ph tn s dng cho cc WCDMA nh sau:WCDMA TDD: 1900 Mhz v 2020 Mhz v 2020 Mhz 2025 Mhz.WCDMA TDD:ng ln (Uplink) : 1920 Mhz 1980 Mhz.ng xung (Downlink) : 2110 Mhz 2170 Mhz3. Trin khai ln 3G All IPThc hin vic nng cp 3G vi dch v d liu tc cao, thi gian thc v di ng. Gim st vic nng cp cc dch v a phng tin p dng cc cng ngh nh: Smart Antenna, TD-CDMA, kh nhiu, sng v tuyn c iu khin bi phn mm, mng li ton IP, kin trc m cho vic cung cp dch v. Tng kh nng tch hp cc loi sng v tuyn khc nhau thanh mt h thng. Tip tc nng cp nhanh chng cc tiu chun 4G, ch hn na s pht trin ca h thng nh hng n vic thit lp mng.L trnh trin khai nng cp mng Mobifone ln mng li 3G ton IP c th hin r trong hnh v di:

Trong nm 2004, mng Mobifone th nghim Release 99. - V giao din v tuyn: Phn mng truy nhp v tuyn mi UTRAN (WCDMA) c thm cc thnh phn RNC v BS. Vic c nng cp giao din v tuyn hin c ca GSM ln EDGE (E-RAN) hay khng l tu chn ca nh khai thc.- MSC/VLR nng cp c th x l c cho phn v tuyn bng rng.- cc dch v IN c th c cung cp cho cc mng tm tr ca thu bao cn trin khai CAMEL.- Kt ni truyn dn trong mng truy nhp v tuyn WCDMA dng ATM nhm h tr cc loi hnh dch v khc nhau: cc dch v tc khng i cho chuyn mch knh v cc dch v c tc thay i i vi chuyn mch gi.- Cc nt mng li c chuyn i: Phn CS phi qun l c thu bao 2G v 3G, i hi thay i trong MSC/VLR v HLR/AuC/EIR. Phn PS c nng cp t GPRS, thay i SGSN l ln nht.- Mng cung cp cc loi dch v 3G v dch v ging vi mng 2,5G, hu ht cc dch v c chuyn sang dng gi khi c nhu cu. V d WAP s chuyn sang dng chuyn mch gi. Dch v da trn v tr gip truyn d liu gi hiu qu hn.T nm 2009:Release 4 s c trin khai trn mng Mobifone. im khc bit chnh ca Release 4 so vi Release 99 l mng li phn b: MSC c chia thnh MSC server v MGW. 3GPP Release 4 tch phn kt ni, iu khin v dch v cho min chuyn mch knh mng li. MSC server c chc nng qun l di ng v iu khin cuc gi, khng cha ma trn chuyn mch, phn t iu khin MGW. Cn Media Gateway (MGW) l phn t chu trch nhim duy tr cc kt ni v thc hin chc nng chuyn mch khi cn. Thoi chuyn mch gi (VoIP): cuc gi chuyn mch knh c chuyn sang chuyn mch gi trong MGW.- u im: khc phc c mt s nhc im ca R99:- Tch ring phn kt ni cuc gi, phn iu khin v phn dch v cho phn mng li chuyn mch knh.- Ton b lu lng i qua MGW, c qun l bng mt MSC Server tch ri (nng cp t MSC/VLR).- Phn CN CS c th c t do m rng khi dng nhiu MGW.- Cho php truyn ti lu lng hiu qu hn nh chuyn mch gi. Mt cuc gi GSM truyn thng s c thay bng VoIP qua MGW. Phn h a phng tin IP (IMS) c thm vo p ng cc dch v a phng tin trn IP v VoIP.T nm 2010:V tip theo nh hng s trin khai :NGN IP Mobile.(Tham kho ti slide gii thiu nh hng trin khai 3G ca VMS-MobiFone trong trin lm vin thng thng 4-2008)

KT LUNHin nay thng tin di ng VMS MobiFone ang trong giai on t th h th hai sang th h th ba. H thng GSM c th cung cp cc dch v nh thoi truyn thng, fax, hp th thoi, bn tin ngn, tr trc v roaming quc t Tuy nhin, GSM c nhng gii hn nht nh nh s dng chuyn mch knh kt ni vi mng in thoi c in, tc ti a 14,4 kbps cho mi khe thi gian, mi cuc gi ch c th chim mt khe thi gian. Nhu cu truyn s liu ngy cng tng i hi cc nh khai thc mng c k hoch chuyn i mng GSM sang mng mi. Mng thng tin di ng th h ba c trin khai s gip p ng c cc nhu cu v truyn s liu ca ngi s dng v tc truyn ca mng ny c th t ti 2Mbps. V tin ti trin khai mng All IP.Trc khi thc hin trin khai mng thng tin di ng th h th ba ca MobiFone chng ta cn nghin cu, quy hoch mng. Nghin cu v quy hoch mng l mt cng vic rt quan trng v phc tp do mi trn truyn tin v mi trng m. Mng 3G hin ang c trin khai mt s nc trn th gii, i vi Vit Nam vn cn mi m v ang c nghin cu trin khai sao cho ph hp vi iu kin thc t. Hn na, cc cng ngh s dng rt phc tp khng th trong mt thi gian ngn c th tm hiu ht.Nhn xa hn na trong tin trnh hi nhp kinh t quc t nc ta, trong tng lai gn nhiu cng ty nc ngoi s tham gia th trng vin thng trong nc. c th cnh tranh thnh cng khi m ca th trng vi nc ngoi, cc doanh nghip vin thng nh MobiFone trong nc cn tranh th c hi thu ht khch hng, chim lnh th trng. Mun lm c iu th vic khng ngng nng cao cht lng mng li v pht trin dch v gi tr gia tng l mt v kh hu hiu trong tay cc doanh nghip.

TI LIU THAM KHO [1]TS.Nguyn Phm Anh Dng. Thng tin di ng. Hc Vin Cng Ngh Bu Chnh Vin Thng, 2005.[2]Tp ch Bu chnh Vin thng v Cng ngh thng tin, B Bu chnh Vin thng, thng 8/2005, 10/2005, 02/2006, 4/2006, 5/2006. [3] KS.Trn nh Tng. Xu hng trin khai mng 3G ca cc nh cung cp GSM Vit Nam, LVTN Trng i Hc Cng Ngh - HQGHN, 2008.[4] http://www.vntelecom.vn/ v mt s ti liu khc trn internet.

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