UTRAN vs eUTRAN
UTRAN (Universal Terrestrial Radio Access Network) thiab eUTRAN (Evolved Universal Terrestrial Radio Access Network) yog ob lub xov tooj cua Access Network Architectures, uas suav nrog Air Interface Technology thiab Access Network Node Elements. UTRAN yog 3G UMTS (Universal Mobile Telecommunication System) xov tooj cua nkag network uas tau qhia hauv 3GPP (Third Generation Partnership Project) Tshaj tawm 99 xyoo 1999 thaum eUTRAN yog LTE (Long Term Evolution) tus neeg sib tw ntawm nws, uas tau qhia hauv 3GPP Tso Tawm 8 xyoo 2008.
UTRAN yog dab tsi?
UTRAN suav nrog UTRA (Universal Terrestrial Radio Access) lossis lwm yam lus, Air Interface Technology, uas suav nrog WCDMA (Wideband Code Division Multiple Access), RNC (Xov tooj cua Network Controller), thiab Node B (3G UMTS Base Station). Feem ntau RNC nyob rau hauv qhov chaw nruab nrab txuas nrog ntau Node Bs rau hauv ib qho RNC. RRC (Xov Tooj Cua Tswj Xyuas) muaj nuj nqi yog siv los ntawm RNC thiab Node B ua ke. UTRAN yog kev sib koom ua ke ntawm CS (Circuit Switched) thiab PS (Packet Switched) network.
Cov kev cuam tshuam sab nraud ntawm UTRAN yog IuCS uas txuas nrog CS Core Network, IuPS uas txuas nrog PS Core Network, thiab Uu interface, uas yog huab cua cuam tshuam ntawm UE thiab Node B. Tshwj xeeb tshaj yog, IuCS tswj lub dav hlau txuas nrog MSC Neeg rau zaub mov, IuCS neeg siv dav hlau txuas nrog MGW (Media Gateway), IuPS tswj lub dav hlau txuas nrog SGSN, thiab IuPS neeg siv dav hlau txuas nrog SGSN lossis GGSN, nyob ntawm Direct Tunnel Implementation. Cov kev cuam tshuam sab hauv ntawm UTRAN yog IuB uas nyob ntawm Node B thiab RNC thiab IuR uas txuas ob RNCs rau kev tuav tes.
EUTRAN yog dab tsi?
The eUTRAN muaj eUTRA (Evolved Universal Terrestrial Radio Access) lossis, hauv lwm lo lus, Air Interface Technology uas suav nrog OFDMA (Orthogonal Frequency Division Multiple Access) thiab eNode Bs (Evolved Node B). Ntawm no, ob qho tib si RNC thiab Node B ua haujlwm tau ua los ntawm eNode B thiab nws txav tag nrho RRC kev ua haujlwm rau Base Station kawg. eNode Bs muab eUTRA tus neeg siv dav hlau (PDCP/RLC/MAC/PHY) thiab tswj lub dav hlau (RRC) raws tu qauv txiav tawm ntawm UE. Qhov tseem ceeb tshaj plaws ntawm eUTRAN yog tias nws muaj lub tiaj tus qauv ntawm Txhua tus IP network.
Lub eNode Bs sib cuam tshuam nrog ib leeg los ntawm X2 interface uas tsuas yog sab hauv ntawm eUTRAN. S1 interface yog siv, los txuas eNode Bsto EPC (Evolved Packet Core), thiab nws yog sab nraud interface ntawm eUTRAN thiab Core Network lossis EPC. S1 interface tuaj yeem raug cais, tshwj xeeb tshaj yog, rau hauv S1-MME thiab S1-U. S1-MME yog ib qho uas eNode B txuas rau MME (Mobility Management Entity), thiab S1-U yog ib qho uas txuas mus rau Qhov Chaw Pabcuam (S-GW). eUTRAN huab cua interface hu ua LTE-Uu uas nyob nruab nrab ntawm UE thiab eNode B.
Qhov txawv ntawm UTRAN thiab eUTRAN yog dab tsi?
• UTRAN yog xov tooj cua Access Network Architecture ntawm 3G UMTS thaum eUTRAN yog LTE.
• UTRAN txhawb nqa Circuit Switched thiab Packet Switch Services thaum eUTRAN tsuas yog txhawb Packet Switch.
• UTRAN Air interface yog WCDMA raws li kev sib kis spectrum modulation thev naus laus zis thaum eUTRAN muaj ntau cov txheej txheem kev hloov pauv hu ua OFDMA.
• UTRAN tau faib xov tooj cua Network ua haujlwm rau hauv ob lub network nodes hu ua Node B thiab RNC, thaum eUTRAN tsuas muaj eNode B uas ua haujlwm zoo sib xws ntawm RNC thiab Node B hauv ib lub caij.
• UTRAN muaj qhov cuam tshuam sab hauv hu ua IuB, IuR thaum X2 tsuas yog sab hauv ntawm eUTRAN.
• UTRAN muaj sab nraud interface Uu, IuCS thiabIuPS thaum eUTRAN muaj S1 thiab tshwj xeeb tshaj yog S1-MME thiab S1-U.
