fdd air interface overhead
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Nokia LTE FDDTRANSCRIPT
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RA41204EN60GLA0 ©2014 Nokia Solutions and Networks. All rights reserved.
Nokia Academy
LTE RPESSLTE FDD Air Interface overheads
RA412!"A
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2 RA4124EN"#LA $214 Nokia So%&tions and Net'orks( A%% ri)hts reserved(
odule !ontents
* "## $h%si&al La%er 'verhead
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+ RA4124EN"#LA $214 Nokia So%&tions and Net'orks( A%% ri)hts reserved(
DC
Slot 100 1 2 3 4 5 6
Su
$
(S
S
S-S
S
DC
Slot 00 1 2 3 4 5 6Symbol
O c c u p i e d
S u b c a r r i e r
s $
(S
S
S-S
S
S%n& Signals and "ra)e *%+e 1 ( "##
Subframe 1 8
f 1 (DL)
0 2 3 4 5 6 7
P-SS
Slot0
Slo
t10
S-SS
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4 RA4124EN"#LA $214 Nokia So%&tions and Net'orks( A%% ri)hts reserved(
S%n&hroni,ation Signals 'verhead*$ri)ar% S%n&hroni,ation Signal -$SS
! occ&,ies 144 Reso&rce E%ements ,er frame -2 times%ots./ i(e( -"2 s&0carriers 1 em,ty Re
2 times3frame
Eam,%e Norma% 5P6 1 789 0and'idth/ PSS overhead : 144 3 -;4 < 2 < =. : 0.1/
*Se&ondar% S%n&hroni,ation Signal -SSS
* Identica% ca%c&%ation to PSS/ same overhead as for PSS
2 + 4 = > ; ?
1 2 + 4 = " >
1 2 + 4 = "
1ms Radio frame
1ms S&0frame SSS
PSS
(=ms : 1 s%ot
Norma% 5P
Etended 5P
PSS @ SSS frame s%ot str&ct&re
in time domain -FDD case.
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Single Antenna $ort and #L Reeren&e Signals
Reeren&e
Signal
#L RS Nor)al *!$
Resour&e
Ele)ent
#L RS E3t
S0 S6
f =1
f =2
f =3
f =12
f =11
S0
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2 $ort #L Reeren&e Signals Nor)al *!$
Port 0Reere!c
Si"!al
D# RS$ %ormal &CP
R0
R0
R0
R0
Port 0
Port 1
R1
R1
R1
R1
%ot usedo! t'is
port
Port 1Reere!ce
Si"!al
%ot usedo! t'is
port
e%ode(
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Antenna $ort La%ering
R1
R1
R1
R1
R
R1
R1
R
eNode
0
1
R
R
R
R
R
R
R
R
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R+
R+
R+
R+
R2
R2
R2
R2
R1
R1
R1
R1
R
R1
R1
R
Antenna $ort La%ering
e%ode(
0
R
R
R
R
R
R
R
R
1
2
3
#L R Si l ' h d
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? RA4124EN"#LA $214 Nokia So%&tions and Net'orks( A%% ri)hts reserved(
#L Reeren&e Signal 'verhead
Reeren&e Signal -RS
! If 1 T antenna 4 RSs ,er PRB
! If 2 T antenna there are ; RSs ,er PRB
! If 4 T antenna there are 12 RSs ,er PRB
* Eam,%e 0e%o' Norma% 5P -74 RE. @ 2 T antenna6 #L RS overhead : ; 3 ;4 : 8.
'ith 13234 Antenna Ports P
'*#'A ' h d
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1 RA4124EN"#LA $214 Nokia So%&tions and Net'orks( A%% ri)hts reserved(
'*#'A 9 'verhead
$ositioning Reeren&e Signal -$RS
- Transmission of PRS red&ces the avai%a0%e reso&rce e%ements for DL traffic
- Additiona% overhead d&e to PRS* Bet'een %ess than (1C &, to 2C de,endin) on confi)&ration
* ith defa&%t confi)&ration
- Additiona% overhead for FDD a,,( ("C
- Additiona% overhead for TDD a,,( 1("C -L!DL frame confi)&ration 1.
- FDD ! -PRS B 3 SysB. of DL frames3 re,etition PRS TTI re,etition
* E) for FDD 2 789
* 131 1 131" : ("2= C
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11 RA4124EN"#LA $214 Nokia So%&tions and Net'orks( A%% ri)hts reserved(
$#!!: $:;!: and $!";!: overhead
S
l
o
t
1
/
S
l
o
t
1
<
S
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1
5
S
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o
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1
Su=ra)e
0
' & & u + i e d
S u = & a r r i e r s
S
l
o
t
1
6
S
l
o
t
1
2
S
l
o
t
1
4
S
l
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t
7
S
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8
S
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1
0
S
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6
S
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4
S
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2
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S
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1
2 < 5 6 / 74
R0
R0
R0
R0
#L
Resour&e
lo&ks
R0
R0
R0
R0
Even Slot 'dd Slot
Not used on
this +ort
Reeren&e
Signal
$#!!:
$#S!:
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12 RA4124EN"#LA $214 Nokia So%&tions and Net'orks( A%% ri)hts reserved(
S%ste) 'verhead #ownlink
$#!!: $!";!: and $:;!:
! The com0ination of PD5586 P5FI58 and P8I58 is a0%e to occ&,y the first 16 2 or + ti
sym0o%s ,er TTI
! As of RL+6 the PD558 Area defined in the P5FI58 0ecomes dynamic
! orst case scenario G PD558 Area is + Sym0o%s 'ide
! The n&m0er of RE occ&,ied ,er 1 ms TTI is )iven 0y -12 < y G .6 'here
* % de,ends &,on the n&m0er of occ&,ied time domain sym0o%s ,er TTI -16 2 or +.
* 3 de,ends &,on the n&m0er of RE a%ready occ&,ied 0y the Reference Si)na%
: 2 for 1 transmit antenna
: 4 for 2 transmit antenna
: 4 for 4 transmit antenna
'hen y : 1
: ; for 4 transmit antenna
'hen y : 2 or +
2 789 : 1 RB
4 Antenna G ; DRS in PD558
P5FI58 : + Sym0o%sD&a% Stream
1"(">C Hverhead
! '
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1+ RA4124EN"#LA $214 Nokia So%&tions and Net'orks( A%% ri)hts reserved(
$!: 'verhead
Hcc&,ies -2;; G . Reso&rce E%ements -REs. ,er 2 times%ots ,er transmit antenna
The va%&e of de,ends &,on the n&m0er of REs a%ready occ&,ied 0y the Reference Si)na%
: 12 for 1 T antenna6 : 24 for 2 T antennas @ : 4; for 4 T antenna- Eam,%e norma% 5P6 2 T antennas6 1 789 0and'idth/
PB58 Hverhead : -2;; G 24. 3 -;4 < 2 < =. : (+1C
> 2
s & 0
c a r r i e r s
Re,etition Pattern of PB58 : 4 ms
one radio frame : 1 ms
PB58 PB58 &ses centra% >2 S&0carrier over 4 HFD7 sym0
>L # d l ti R Si l ' h d -132.
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14 RA4124EN"#LA $214 Nokia So%&tions and Net'orks( A%% ri)hts reserved(
>L #e)odulation Reeren&e Signal 'verhead -132.
#e)odulation Reeren&e Signal
-#RS
- The #RS is sent on the 4th HFD7
sym0o% of each RB occ&,ied 0y thePS58(
L DRS occ&,ies the 'ho%e
a%%ocated 0and ece,t 2
RB 0and'idthJ in the 0oth
end(Reference si)na% 12 RE
-,er RB. -=!2. RBs not
dedicated to P558 3-;4
=. :1+(14C
>L #RS ' h d -232.
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1= RA4124EN"#LA $214 Nokia So%&tions and Net'orks( A%% ri)hts reserved(
Eam,%e
For 1(4 789 5hanne% Band'idth6 the P558 occ&,ies 1 RB ,er S%ot(
The n&m0er of RE ,er RB is ;4 'hen &sin) the norma% 5P(
This means the DRS overhead is --"!1. < 12.3-" < ;4. : 11(? C
5hanne% B P558 RB3s%ot DRS Hverhead
1(4 789 1 --"!1. < 12. 3 -" < ;4. : 11(? C
+ 789 2 --1=!2. < 12. 3 -1= < ;4. : 12(+; C
= 789 2 --2=!2. < 12. 3 -2= < ;4. : 1+(14 C
1 789 4 --=!4. < 12. 3 -= < ;4. : 1+(14 C
1= 789 " -->=!". < 12. 3 ->= < ;4. : 1+(14 C 2 789 ; -1!;. < 12. 3 -1 < ;4. : 1+(14 C
>L #RS 'verhead -232.
for norma% 5P
$RA!: ' h d
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1" RA4124EN"#LA $214 Nokia So%&tions and Net'orks( A%% ri)hts reserved(
$RA!: 'verhead
*$RA!:
- $RA!: &ses 6 Resour&e lo&ks in the freK&ency domain(
- The %ocation of those reso&rce 0%ocks is dynamic( T'o ,arameters from RR5 %ayer d
* $RA!: !oniguration ;nde3 for Timin)6 se%ectin) 0et'een 1 of 4 PRA58 d&raPRA58 ,ream0%es can 0e send in any radio frame or on%y in even n&m0ered one
* $RA!: "re?uen&% oset Defines the %ocation in freK&ency domain
- $RA!: 'verhead ca%c&%ation " RBs RA58 Density 3 -RB ,er TTI. 1 TTIs ,e
* RA58 density ho' often are RA58 reso&rces reserved ,er 1 ms frame i(e( for
-RA58 reso&rce reserved once ,er frame.
5hanne% B PRA58 Hverhead
1(4 789 -" < 1. 3 -" < 1. : 1 C + 789 -" < 1. 3 -1= < 1. : 4 C
= 789 -" < 1. 3 -2= < 1. : 2(4 C
1 789 -" < 1. 3 -= < 1. : 1(2 C
1= 789 -" < 1. 3 ->= < 1. : (; C
2 789 -" < 1. 3 -1 < 1. : (" C
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1> RA4124EN"#LA $214 Nokia So%&tions and Net'orks( A%% ri)hts reserved(
De
P
ulti+le $>!!: in 'ne Su=ra)e
Subframe
0
O c c u
p i e d
S u b c a
r r i e r s
1 2 3 5 6 7 84
) #
R e s o u
r c
e
( l o c +
s
,e! Slot Odd Slot
P)CC* 0
P)CC* 1
P)CC* 1
P)CC* 0
P)CC* 3
P)CC* 3
P
P)CC* 2
P)CC* 2
$>!!: 'verhead
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1; RA4124EN"#LA $214 Nokia So%&tions and Net'orks( A%% ri)hts reserved(
$>!!: 'verhead
*$>!!:
- Ratio 0et'een the n&m0er of RBs &sed for P558 and the tota
in freK&ency domain ,er TTI
5hanne% B P558 RB3s%ot P558 Hverhead 1(4 789 1 1 3 " : 1"("> C
+ 789 2 2 3 1= : 1+(++ C
= 789 2 2 3 2= : ; C
1 789 4 4 3 = : ; C
1= 789 " " 3 >= : ; C
2 789 ; ; 3 1 : ;C
P558 carries 5I-,%ink 5ontro% Information.6
i(e6 A,eriodic 5I re,orts and A5M3NA5M
$h%si&al La%er 'verhead E3a)+le
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1? RA4124EN"#LA $214 Nokia So%&tions and Net'orks( A%% ri)hts reserved(
$h%si&al La%er 'verhead E3a)+le
Eam,%e of overhead• DL 2T G 2R• L 1T ! 2R• PRA58 in every frame• + HFD7 sym0o%s for
PD558• No HTDHA
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