TDD vs FDD

LTE(TDD) System Overview

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Note instruction 

Font: FrutigerNext LT Regular Regular

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Font Size: 11

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Item symbol Size: 70%

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Row Sace: 1!"#

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Segment: $ oun

Confidential Information of Huawei. Huawei. No Sreadin! "it#out "it#out $ermission

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Confidential Information of Huawei. Huawei. No Sreadin! "it#out "it#out $ermission

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In LT&' e(ices are allocate bloc)s o* subcarriers *or a erio o* time! T+ese are re*erre to as a ,R- , ysica Resource - oc ! T e resource oc s are containe wit in t e LT& generic *rame structure o* w+ic+ two tyes are e*ine Tye 1 an Tye " raio *rames!

Confidential Information of Huawei. No Sreadin! "it#out $ermission


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 searate ulin) an ownlin) c+annel are utilize enabling a e(ice to transmit an recei(e ata at t e same time assuming t e e(ice incororates a u exer ! T e sacing between t+e ulin) an ownlin) c+annel is re*erre to as t+e ulex sacing! Normally t+e ulin) c+annel .mobile transmit/ oerates on t+e lower *re2uenc y! T+is is one because +ig+er *re2uencies su**er greater attenuation t+an lower *re2uencies an t+ere*ore it enables t+e mobile to utilize lower transmit ower le(els! Some systems also o**er +al*3ulex F44 moe' w+ere two *re2uencies are utilize' +owe(er t+e mobile can only transmit or recei(e' i!e! not transmit an recei(e at t+e same time! T+is allows *or reuce mobile comlexity since no ulex *ilter is re2uire!



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T44 moe enables *ull ulex oeration using a single *re2uency ban wit+ time i(ision mu ti exing or t e u in an own in signa s! 5ne a (antage o T44 is its a i ity to ro(ie asymmetric ulin) an ownlin) allocations! 4eening on t+e system' ot+er a(antages inclue ynamic allocation' increase sectral e**iciency' an imro(e use o* beam*orming tec+ni2ues! T+e later being ue to t+e carrier +a(ing t+e same ulin) an ownlin) *re2uency c+aracteristics!



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T+e LT&3F44 *rame *ormat e*ine in $6,, is Tye 1! T+e Tye 1 raio *rame structure is use or F44 an is 10ms in uration! It consists o "0 s ots' eac asting 0!#ms! Two aacent slots *orm one sub*rame! For F44 oeration' 10 sub*rames are a(ailable *or ownlin) transmission an 10 sub*rames are a(ailable *or ulin) transmission' wit+ eac+ transmission searate in t+e *re2uency omain! 8, .8yclic ,re*ix/ wit+in 5F49 systems +as alreay been iscusse! In LT&' two i**erent cyclic re*ix sizes' namely Normal; an &xtene; were selecte! In orer to *acilitate t+ese' two i**erent slot *ormats are re2uire! Figure "3"< illustrates t+e se(en an six 54F9 symbol otions! 5b(iously' to *acilitate a larger cyclic re*ix' one o* t+e symbols is sacri*ice' t+us t+e symbol rate is reuce! T+e use o* t+e extene cyclic re*ix is intene *or scenarios w+ere t+e range o* t+e cell nees to be extene' e!g! *or co(erage lanning uroses or w+en mu lticast ser(ices are being emloye in t+e cell!



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T+e LT&3T44 *rame *ormat e*ine in $6,, is Tye "! T+e Tye " raio *rame structure is use or T44! 5ne ey a ition to t e T44 rame structure is t e concet o secia sub*rames;! T+is inclues a 4w,TS .4ownlin) ,ilot Time Slot/' 6, .6uar ,erio/ an =,TS .=lin) ,ilot Time Slot/! T+ese +a(e con*igurable ini(iual lengt+s an a combine total lengt+ o* 1ms! For T44 oeration' t+e ten sub*rames are s+are between t+e ulin) an t+e ownlin)!



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T+e 4w,TS can be consiere as a secial ownlin) sub*rame' w+ic+ contains 1" symbols at most an $ sym o s at east! T e 4w,TS is use to transmit own in ata an signa ing messages!

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No control signaling message or ata is transmitte in t+e =,TS!

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T+e lengt+ o* t+e =,TS is two symbols or one symbol! 

>+en t+e =,TS contains two symbols' it is use *or s+o rt R8? or souning RS!

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>+en t+e =,TS contains one symbol' it is use only *or sou ning!




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T+ere are (arious *rame con*iguration otions a(ailable *or T44 oeration! Table illustrates t ese i erent otions! 8on iguration otions 0' 1' " an @ a(e a #ms switc ing oint an t+ere*ore re2uire two secial sub*rames! T+e remainer are base on a 10ms switc+ing oint! In t+e table' t+e letter 4; is reser(e *or ownlin) transmissions' =; ulin) transmissions an S; enotes a secial sub*rame wit+ t+e t+ree *iels 4w,TS' 6, an =,TS!




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Note instruction 

Font: FrutigerNext LT Regular

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Font Size: 11

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Item symbol Size: 70%

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Row Sace: 1!"#

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Segment: $ oun


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5erating bans e*ine *or F44 in $6,,


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5erating bans e*ine *or T44 in $6,,


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I8I8:Inter3cell Inter*erence 8oorination


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LTE Cell $lannin!


LTE Cell $lannin!


LTE Cell $lannin!

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9eaning: Inicates t+e ratio o* =L sub*rames to 4L sub*rames in a T44 cell! For etails' see $6,, TS $@!"11! 6=I Aalue Range: S0.S0/' S1.S1/' S".S"/' S$.S$/' SB.SB/' S#.S#/' S@.S@/

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=nit: None

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ctual Aalue Range: S0' S1' S"' S$' SB' S#' S@


LTE Cell $lannin!


LTE Cell $lannin!


LTE Cell $lannin!


TDD vs FDD

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