16 Capacity Engineering

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LTE Capacity Engineering

14 Sep 2015

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 Multiple Access Techniques – OFDMA an S! FDMAMultiple Access Techniques – OFDMA an S! FDMA

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 "nter#erence management"nter#erence management

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 Multiple Antenna TechniquesMultiple Antenna Techniques

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 S$S Semi $ersistent Scheuling %#or &o"$ '( reucing control channelS$S Semi $ersistent Scheuling %#or &o"$ '( reucing control channel loa)

loa)

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 Short Su' #rame Duration an *o+ ,A-. -oun Trip TimeShort Su' #rame Duration an *o+ ,A-. -oun Trip Time

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 A/ance -ecei/ers – lie *MMSE %*inear Minimum Mean SquareA/ance -ecei/ers – lie *MMSE %*inear Minimum Mean Square

Error) +ith "-! % "nter#erence -eection !om'ining) Error) +ith "-! % "nter#erence -eection !om'ining)

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 -eucing *a(er 1 an *a(er 2 O/erheas-eucing *a(er 1 an *a(er 2 O/erheas

Factors Impacting Capacity in LTE

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Interference Management in LTE

*TE s(stem pro/ies orthogonal resources allocation in the #requenc( *TE s(stem pro/ies orthogonal resources allocation in the #requenc( omain +hich ena'les #requenc( omain multi user i/ersit(

omain +hich ena'les #requenc( omain multi user i/ersit( gaingain **TE supports /arious techniques TE supports /arious techniques to mitigate inter cell to mitigate inter cell inter#erence inter#erence 33

DOW LI! DOW LI!

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 !-S – !ell Speci4c -e#erence Signals ha/e #requenc( shi#t applie as!-S – !ell Speci4c -e#erence Signals ha/e #requenc( shi#t applie as

per $!" per $!"

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 Do+n *in !ontrol !hannels – Do+n *in !ontrol !hannels – a cell speci4c a cell speci4c #req#requenc( oset isuenc( oset is

applie to $!F"!, an $,"!, 6

applie to $!F"!, an $,"!, 6 #or $DS!, interlea/ing pro/ies#or $DS!, interlea/ing pro/ies #requenc( i/ersit(

#requenc( i/ersit(

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 "!"! "nter !ell "nter#erence !o3orination Techniques '( utili7ing"!"! "nter !ell "nter#erence !o3orination Techniques '( utili7ing -8T$ -elati/e 8arro+ 'an Transmit $o+er messages o/er 92 -8T$ -elati/e 8arro+ 'an Transmit $o+er messages o/er 92 inter#ace

inter#ace

"#LI! "#LI!

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 Fractional $o+er !ontrolFractional $o+er !ontrol

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 -esources Allocation – higher -:s at !ell center an *o+er -:s-esources Allocation – higher -:s at !ell center an *o+er -:s

at !ell Ege at !ell Ege

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 $;!, – cell speci4c s(m'ol le/el c(clic $;!, – cell speci4c s(m'ol le/el c(clic shi#t hopping is applie <shi#t hopping is applie <

Each $;!!, -: is mappe to 'oth

Each $;!!, -: is mappe to 'oth eges o# the s(stemeges o# the s(stem 'an+ith to a

'an+ith to achie/e #requechie/e #requenc( i/ersit(nc( i/ersit(

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 "nepenent "nepenent inter#erence inter#erence management techniques management techniques lie lie po+erpo+er

control can 'e applie to control an ata channels control can 'e applie to control an ata channels

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 An( part o# the time #requenc( transmission resources not irectl(

use #or ata transmission constitutes an o/erhea

 -equire to minimi7e these o/erheas +hile achie/ing high s(stem per#ormance an >e?i'ilit(

 O/erheas are @uar 'ans6 the OFDM !$6 -S an !ontrol !hannels  The percentage o/erhea increases +ith num'er o# transmit

antennas ue to higher -S o/erhea

 Thus the @ain #rom M"8O has to oset this increase o/erhea

e &c ng ayer an

ayer

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 E?ample o# $ercentage O/erhea o# *TE FDD calculate o/er 10 ms

raio #rame #or 10 M,7 :an+ith

 -E in 10 ms raio #rame #or 10 M,7  B= C 2C10C50  B=000

 !-S per -:  = -E #or antenna 1 an 2 an 2 -E #or antenna  an

=

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e

pec

c e erence gna s or

one ntenna

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CELL S#ECIFIC $EFE$ECE SI,LS FO$ FO"$

TE #O$TS

• -S require #or channel estimation #or coherent etection

• $ort 0 an 1 ha/e

#our -S per -:

• $ort 2 an  ha/e

t+o -S per -: to reuce o/erheas

• E/er( si?

su'carriers ha/e one -:

• Ghen one antenna

raiate -S6 other eep quiet so that ;E can measure one -S at an( time

• !ell Speci4c

Frequenc( Shi#t is applie up to si? cells to reuce inter

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 Each $D!!, carries a message no+n as D!" Do+n *in !ontrol

"n#ormation +hich contains resource assignments an other control in#ormation #or a ;E or a group o# ;Es

 Each $D!!, is transmitte using one o# more !!Es !ontrol !hannel

Elements +hich each !!E correspons to nine -E@s – Four .$SH s(m'ols are mappe to each -E@

 Four $D!!, Formats are supporte as uner

 The num'er o# !!Es are aggregate as per !hannel !onitions – one

!!E ma( 'e suIcient in goo -F conitions +hile eight !!Es ma( 'e require at !ell Ege

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 Dierent D!" Formats are use as per s(stem eplo(ment to

transmit onl( rele/ant in#ormation – #or e?ample i# M"MO is not use6 there is no nee to signal parameters neee onl( #or M"MO

transmission

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an

 ync ron 3a on

Signa*s

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 E?ample o# $ercentage O/erhea #or *TE TDD uplin o/er a 10 ms

raio #rame #or a 10 M,7 s(stem 'an+ith

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 De Moulation -S %DM -S) associate +ith $;S!, an J or $;!!, –

use #or channel estimation #or coherent etection

 Souning -S S-S – not associate +ith uplin ata or control an

primaril( use #or channel qualit( etermination to ena'le #requenc( selecti/e scheuling on the uplin

 The DM-S occup( the same -: as $;S!, J $;!!,

 The S-S are transmitte on the last S! FDMA s(m'ol in the

con4gure su' #rame

 The S-S an DM -S are locate in ierent S! FDMA s(m'ols

 $;S!, ata transmission is not permitte on the S! FDMA s(m'ol

esignate #or S-S

 The e8: ma( either request an ini/iual S-S transmission #rom a ;E or con4gure a ;E to transmit S-S perioicall(

 "# perioic S-S transmission are con4gure #or a ;E6 the perioicit(

ma( 'e 2656106206=06B0610 or 20 ms

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 The DM-S are pro/ie #or channel estimation

 The DM-S occupies the #ourth S! FDMA s(m'ol #or normal !$

 The DM-S occupies the thir S! FDMA s(m'ol in case o# e?tene

!$

emo & a on

$eference Signa*s

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 E?ample to con/ert cell throughput /alues into ma?imum num'er o#

'roa'an su'scri'ers

 TraIc &olume :ase Approach 3 estimates the ma?imum traIc

/olume in @iga :(tes that can 'e carrie '( *TE 20 M,7 +ith gi/en spectral eIcienc( an 2?2 M"MO

 Data -ate :ase Approach – the :us( ,our *oaing is assume to

carr( 15K o# the ail( traIc an :us( ,our A/erage *oaing is 50K<

Capacity Dimensioning

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S&.scri.ers #er Site

 BC102=

5 M'psC50K J %1J20)C

L5

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pec a & rame

+

Con/g&rations

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Transport -*oc Si3e 6T-S8

M!S  2B %T:S 2) M!S  2 %T:S 25) M!S  2 %T:S 2=) !F" 1 2  1 2  1 2  -: num 100 100 100 100 100 100 100 100 100 -E num per ms 1== 12 120 1== 12 120 1== 12 120 -E num per secon 1==00 1200 1200 0 1==0 0 120 0 1200 0 1==0 0 120 0 1200 0 T: Si7e in :its 5 5 5_ _ _ _ 1₌ 1₌ 1₌ $er ms  B= OFDM S(m'ols ? 2  1B S(m'ols !-S  = per -: per Antenna $ort +hich means B per Antenna $ort per Time Slot or 1 per ms !ontrol S(m'ols  12 containing #our -S positions Data OFDM S(m'ols  1B313%123=) !F"2 !ontrol OFDM S(m'ols  2= Data OFDM S(m'ols  1B313%2=3=)  12 !F" !ontrol OFDM S(m'ols   Data OFDM S(m'ols  1B313%3=)  120

!oe -ate % T: Si7e ) J %Total TT" :its)

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 !oe -ate is e4ne as the num'er o# o+nlin in#ormation 'its

incluing !-! 'its i/ie '( the num'er o# $h(sical !hannel :its on the $DS!,

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ro&g p& s  on g&ra on +

;

1msec 1msec 1msec 1msec 1msec 1msec 1msec 1msec 1msec 1msec

con4g2P normal

!$ su' Q0 su' Q1 su'Q2 su'Q su'Q= su'Q5 su'Q su'Q su'QB su'Q

DL specia* "L DL DL DL speci

a* "L DL DL

ata 'it per TT"

%=.AM) 5 5B2 ? 5 5 5 5B2 ? 5 5

10 msec

55B1 M!S2B6 MA9 Tput %TM2) 5<00 M 55B0B<

M!S2B6 MA9 Tput %TM) 112<00 M 1111

1msec 1msec 1msec 1msec 1msec 1msec 1msec 1msec 1msec 1msec

con4g2P normal

!$ su' Q0 su' Q1 su'Q2 su'Q su'Q= su'Q5 su'Q su'Q su'QB su'Q D* special ;* D* D* D* specia_l ;* D* D* ata 'it per TT"

%=.AM)  =55 ?    =55 ?   10 msec =B0 M!S26 MA9 Tput %TM2) =<B M =B025< M!S26 MA9 Tput %TM) =< M =050< 5C2152J %2152R=B=R=B=) C2152J %2152R=B=R=B=)

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o & a on r er an

ranspor

-*oc Si3e

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Comp&tation

DL TP calculation

Calculation Procedure for downlink(PDSCH) is as follows : i) refer to TS36.213 Table .1..1!1

ii) "et #$T%S for usin" &CS 'alue (e #$T%S is 26 if &CS is 2*) iii) refer to TS36.213 Table.1..2.1

i') "o to colu+n ,eader indicatin" t,e nu+ber of -% ') "o to row ,eader 26  w,ic, is #$T%S

'i) ou would "et /36 (if t,e nu+ber of -% is 100 and #$T%S is 26)  t,us t,rou",ut in DD would be / &bs

'ii) (T,is is Transfer %lock Si4e er 1 +s(1 sub fra+e) for one 5ntenna) T,is w,en con'erted into TDD !2 confi"uration "i'es around /6 &bs

#f we use 2 antenna (T& +ode 3 or ) it is 176 8 1000 +s 9  17. &bs  t,is w,en con'erted into TDD !2 confi"uration "i'es us around 112 &bs

T,e t,rou",ut in DD would be around 1/0 &bs

MCS Index Modulatio n Order TBS Index 0 2 0 1 2 1 2 2 2 3 2 3 4 2 4 5 2 5 6 2 6 7 2 7 8 2 8 9 2 9 10 4 9 11 4 10 12 4 11 13 4 12 14 4 13 15 4 14 16 4 15 17 6 15 18 6 16 19 6 17 20 6 18 21 6 19 22 6 20 23 6 21 24 6 22 25 6 23 26 6 24 27 6 25 28 6 26 29 2 30 4 31 6

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Don Lin T(ro&g(p&t for ;+2

MCS Index TBS Index One layerTransport block size @ RB100 Two layerTransport block size @ RB100 ownlink sub!ra"e #00TTI$S ownlink sub !ra"e %00TTI$S&0'() TM "ode * T+rou,+put-bit$s. TM "ode % T+rou,+put-bit$s. 0 2, 0, 1, 0, 2, 21, 1, 2 0 2792 ₅₅₄₄ 600 150 _4,158,000 _2,094,000 1 1 3624 ₇₂₂₄ 600 150 _5,418,000 _2,718,000 2 2 4584 ₉₁₄₄ 600 150 _6,858,000 _3,438,000 3 3 5736 ₁₁₄₄₈ 600 150 _8,586,000 _4,302,000 4 4 7224 ₁₄₆₈₈ 600 150 _11,016,000 _5,418,000 5 5 8760 ₁₇₅₆₈ 600 150 _13,176,000 _6,570,000 6 6 10296 ₂₀₆₁₆ 600 150 _15,462,000 _7,722,000 7 7 12216 ₂₄₄₉₆ 600 150 _18,372,000 _9,162,000 8 8 14112 ₂₈₃₃₆ 600 150 _21,252,000 _10,584,000 9 9 15840 ₃₁₇₀₄ 600 150 _23,778,000 _11,880,000 10 9 15840 ₃₁₇₀₄ 600 150 _23,778,000 _11,880,000 11 10 17568 ₃₅₁₆₀ 600 150 _26,370,000 _13,176,000 12 11 19848 ₃₉₂₃₂ 600 150 _29,424,000 _14,886,000 13 12 22920 ₄₅₃₅₂ 600 150 _34,014,000 _17,190,000 14 13 25456 ₅₁₀₂₄ 600 150 _38,268,000 _19,092,000 15 14 28336 ₅₇₃₃₆ 600 150 _43,002,000 _21,252,000 16 15 30576 ₆₁₆₆₄ 600 150 _46,248,000 _22,932,000 17 15 30576 ₆₁₆₆₄ 600 150 _46,248,000 _22,932,000 18 16 32856 ₆₆₅₉₂ 600 150 _49,944,000 _24,642,000 19 17 36696 ₇₃₇₁₂ 600 150 _55,284,000 _27,522,000 20 18 39232 ₇₈₇₀₄ 600 150 _59,028,000 _29,424,000 21 19 43816 ₈₇₉₃₆ 600 150 _65,952,000 _32,862,000 22 20 46888 ₉₃₈₀₀ 600 150 _70,350,000 _35,166,000 23 21 51024 ₁₀₁₈₄₀ 600 150 _76,380,000 _38,268,000 24 22 55056 ₁₁₀₁₃₆ 600 150 _82,602,000 _41,292,000 25 23 57336 ₁₁₅₀₄₀ 600 150 _86,280,000 _43,002,000 26 24 61664 ₁₂₄₄₆₄ 600 150 _93,348,000 _46,248,000 27 25 63776 128496 600 150 96,372,000 47,832,000

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ne ayer o o ayer

Trans*ation

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-ac(a&* Dimensioning

%andwidt, Peak D; Sector T,rou",ut 5TP11% Pass Criteria 5'era"e D; Sector T,rou",ut 20&H4 TDD 100 &bs /0 &bs 16./ &bs

/&H4 DD 30 &bs 20 &bs // &bs

C,annel Card <o. %andwidt, and Carrier %ack,aul Di+ensionin" 1 20&H4 = 2300&H4 TDD 200 &bs (one carrier) 2 /&H4>/&H4 = 1*00&H4 DD 120 &bs (two carriers) 3 /&H4>/&H4 = */0&H4 DD 120 &bs (two carriers)

Total ! 0 &bs

1< !ontention -atio taen as J2  1<5 #or three sectors i<e< 200 M'ps #or three sectors +ith 100 M'ps pea in each sector

2< The a'o/e is 'ase on -an "ne? as 2 an shoul hol aequate as -an "ne? = e/ices +ith higher contention ratio<

< For single carrier in :an  an :an 56 the 'achaul requirements +oul come as 20 M'ps