WHAT IS LTE--IIWhat is LTE eNB? One of the biggest differences between LTE network and legac !obile co!!"nication sste! #$ is a base station% There "sed to be intelligent and centrali&ing node like 'N( )'adio Network (ontroller* in #$ +for e,a!-le%It needed to control all the radio reso"rces and !obilit o.er !"lti-le NodeB )#$ base stations* "nderneath in hieratical radio access network%All NodeB need to do is beha.e e,actl according to co!!and fro! 'N( thro"gh I"b interface% In LTE+ on the other hand+ eNB )e.ol.ed NodeB* as base station ha.e to !anage radio reso"rce and !obilit in the cell and sector to o-ti!i&e all the /E0s co!!"nication in flat radio network str"ct"re% Therefore+ the -erfor!ance of LTE eNB de-ends onradio reso"rce !anage!ent algorith! and its i!-le!entation% #$ 'adio Access Network )/T'AN* Architect"re E-/T'AN Architect"re1hsical InterfaceAccording to O.er.iew of #$11+ LTE radio access technolog is described as follows2 The !"lti-le access sche!e for the LTE -hsical laer is based on Orthogonal 3re4"enc 5i.ision 6"lti-le Access )O356* with a (clic 1refi, )(1* in the downlink and a Single (arrier 3re4"enc 5i.ision 6"lti-le Access )S(-356A* with (1 in the "-link% O356A techni4"e is -artic"larl s"ited for fre4"enc selecti.e channel and high data rate%It transfor!s a wideband fre4"enc selecti.e channel into a set of -arallel flat fading narrowbandchannels+ thanks to (1% This ideall+ allows the recei.er to -erfor! a low co!-le, e4"ali&ation -rocess in fre4"enc do!ain+i%e%+ 7 ta- scalar e4"ali&ation%The baseband signal re-resenting a downlink -hsical channel is defined in ter!s of the following ste-s2 scra!bling of coded bits in each of the code words tobe trans!itted on a -hsical channel !od"lation of scra!bled bits to generate co!-le,-.al"ed !od"lation s!bols !a--ing of the co!-le,-.al"ed !od"lation s!bols onto one or se.eral trans!ission laers -recoding of the co!-le,-.al"ed !od"lation s!bolson each laer for trans!ission on the antenna -orts !a--ing of co!-le,-.al"ed !od"lation s!bols for each antenna -ort to reso"rce ele!ents generation of co!-le,-.al"ed ti!e-do!ain O356 signal for each antenna -ortThe baseband signal re-resenting the -hsical "-link shared channel is defined in ter!s of the following ste-s+ as shown in the below fig"re2 scra!bling !od"lation of scra!bled bits to generate co!-le,-.al"ed s!bols transfor! -recoding to generate co!-le,-.al"ed s!bols !a--ing of co!-le,-.al"ed s!bols to reso"rce ele!ents generation of co!-le,-.al"ed ti!e-do!ain S(-356A signal for each antenna -ortO.er.iew of downlink -hsical channel-rocessing%O.er.iew of "-link -hsical channel -rocessing%C-plane Protocol Procedures (--lane -rotocol -roced"re test is !andator+ and it incl"des not onl f"nctional testing b"t also the testing "nder load condition% There are !"lti-le -rotocol -roced"res in (--lane+ and all the -roced"res are co.ered in this section% E4"i-!ent .enders test ''( connection establish!ent8release -roced"re as f"nctional test in earl -hase of eNB sste! testing%''( (onnection Establish!ent8'elease 1roced"re The first ste- to e.al"ate the (--lace -rotocol is to test the basic f"nction+ s"ch as connection establish!ent8release -roced"re for LTE eNB% In ''( -rotocol in E-/T'AN+ there are onl two states+ ''(9I5LE and ''(9(ONNE(TE5 )shown in 3ig"re A below*+ so that connection can be set "-faster% (onnection establish!ent and release -roced"re initiated b /E on /" and S7 interface is shown in 3ig"re B% 1aging )(onnection establish!ent and release -roced"re initiated b E-/T'AN* on /" and S7 interface is shown in 3ig"re% ''( -rotocol -roced"re is described in details in #$11 TS#:%##7% In order to e.al"ate (--lane -erfor!ance of LTE eNB+ the reliable transition between these two states is critical%''( 1rotocol State Transition(onnection Establish and 'elease 1roced"reLTE Deployment Status 2012isgoingtobeyearof LTEintermstrials and commercial launches. In the frst week of this year 3 commercialLTE launches hae already been announcedso far! o"erators are #ia $%ahrain&! T'obile $(ungary& and )T $*outh )orea&. Intotal 30+commercial LTErollouts aree,"ected this year. -s of now ./ LTE networks has beencommercially launched in 2/ countries.Including these total 220 frm LTE networkde"loyments are "lanned or in "rogress in10 countries! says a recent 2*- re"ort. - further 3/ o"erators in 11 additionalcountries areengagedin"re4commercialLTE technology "ilot trials! tests or studies. LTE small cell de"loyments are e,"ected toform a key market trend in 2012 as well. -number of o"erators including #eri5on and*"rint hae already committed to LTEfemtocells.! *)Telecomhasannouncedcom"letionofthedeelo"ment of 67i48i IntegratedLTE8emtocell. -surey conducted recently had shownthat 009of o"eratorsbelieethat smallcells will bemoreim"ortant thanmacrocells in LTE networks. :nsubscriberbase! LTEsubscri"tionsarereaching to 0.. million that currentlycom"riseonly0.19of thetotal market$0.1 billion global cellular networksubscri"tions&. -ccordingto;esearchand'arkets! LTEsubscri"tions will signifcantly growoerthene,t3years! eentuallyre"resentingmore than < 9 of the market in 2010. =resently! >.* o"erator #eri5on 7irelessand ?a"anese o"erator @TT AoBo'o areleading the LTE market with market sharesof 03 9 and 22 9 res"ectiely . India's Bharti Airtel is reported to have awarded a contract to China's ZTE for the deployment of an LTE based 4G networ in !olata circle Bharti Airtel owns BWA licenses in Maharashtra, Kolkata, Karnataka and Punjab, where it can deploy WiMAX or LTE etworks! The "te contract co#erin$ Kolkata %ay be e&tended to other circlesAbbre.iations'( 'rd (eneration'!)( '!)th (eneration'(PP 'rd (eneration Partnership Project*( *th (enerationAAA Authentication, Authori+ation and Accountin$A,K Acknowled$e%entA,L- Adjacent ,hannel Leaka$e -atioA,. 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