FDD Air Interface Overhead

7/17/2019 FDD Air Interface Overhead

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RA41204EN60GLA0 ©2014 Nokia Solutions and Networks. All rights reserved.

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LTE RPESSLTE FDD Air Interface overheads

RA412!"A



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odule !ontents

* "## $h%si&al La%er 'verhead



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DC

Slot 100 1 2 3 4 5 6

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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

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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




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

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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

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0

R

R

R

R

R

R

R

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1

2

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#L R Si l ' h d



? 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




'*#'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




$#!!: $:;!: and $!";!: overhead

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R0

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Resour&e

lo&ks

R0

R0

R0

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Even Slot 'dd Slot

Not used on

this +ort

Reeren&e

Signal

$#!!:

$#S!:




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



'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

! '



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.




>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.



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



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



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



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



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

FDD Air Interface Overhead

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