Small Cell Timing and Sync Presentation SCA

7/24/2019 Small Cell Timing and Sync Presentation SCA

1/20

2013 Small Cell Americas, Dallas, Dec

Timing is everything:

Navigating Small Cell Timing & Sync

David Chambers

ThinkSmallCell.cm


2/20


!b"t ThinkSmallCell

#"nded Se$t 200%as Think#emtcell

nde$endent ne's(analysis( insight int

Small Cells )ased n a belie*

that small cellarchitect"re is the

nly credible sl"tin*r high data tra+c

David Chambers().Sc. ,-ns( /T(C.ng( Di$. /.(/C/( Chartered

/arketer Career incl"des

Telecm s*t'are engineer

Telecm $rd"ct manager

Standards ,TS( 3 Chartered ngineer

Chartered /arketer

2

Sign "$ *r "r *ree mnthly ne'sletter at

ThinkSmallCell.cm


3/20


"estin 41

-' *ar des a radi 'ave travel in 1nansecnd5

! *t

! yard

! mile


4/20


!ns'er 41

-' *ar des a radi 'ave travel in 1nansecnd5

iven:

S$eed * light 6 300(000(000metres7secnd

1(000(000(000 nansecnds in 1 secnd

!ns'er: 0.3 metres

,a$$r8 1 *t


5/20


9hy Timing and Sync5

nd ser8$erience- Seamless

-andvers- #e'er

Dr$$ed calls

-!vid datastreamglitches

S$ectral+ciency- S;"ee


6/20


The Three levels * Sync

None Frequency Frequency & Phase9i=#i 3 /TS 3 CD/!

)l"etth 3 TD=SCD/!

> #DD ?T TD=?T

?T=!dvanced

!t the same time(backha"l transmissinis migrating *rm T171

t thernet


7/20


Three Cm$eting #rces

/a8imise S$ectral+ciency- ?T=!dvanced

- C/- e/)/S-

eCC

/a8imise S$atial+ciency- !dd mre small cells

Derive sync viabackha"l- Sync thernet- T , 1@AA v2

-NT

Derive syncinde$endently- NSS- Neighb"r Cellsite Sni+ng

#DD- DesnBt ,al'ays

re;"ire hase Sync

TDD- e;"ires hase Sync


8/20


e ange m ngTlerances

esidentialSmallCell

nter$riseSmall Cell

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?T=! @0$$b @0$$b @0$$b71.@s

@0$$b70.@s

?T @0$$b @0$$b @0$$b @0$$b

TD=?T

@0$$b @0$$b71.@s

@0$$b71.@ t@s

2@0$$b


9/20


Synchrnisatin Technlgy E$tins

GNSS NTP 1588v2(PTP)

SyncE Snifng

#re;"ency

hase

Trans$rt hysical ?ayer 3 ?ayer 2 &3

hysical hysical

se cases Nrth!merican*emtcellsF !ny

37?Tsmall cell

3 /TS#emtcells &nter$rise

nter$riseand rbansmall cells

rbansmall cells

esidential andstandalne

nter$rise

?imitatins

ssible$rindrsignal

rece$tin

acketdelayvariatinsin 'ireline

bradband

acketdelayvariatinin

backha"l

/"st beend=t=end Syncthr"gh"

t

ece$tin*rmnearbycell

t'ers


10/20


NSS Devel$ments

tBs n lnger G"st S ?EN!SS ,"ssian

Cm$ass ,Chinese

alile ,"r$ean

/"lti=standard receivers n' mrecmmn

Sn "$ t 300 diHerent satellites

ncreased receiver $er*rmance Demnstrated d'n t =1%@d)m

/re likely t 'rk indrs than be*re


11/20


Sme $r S installatins


12/20


rec se me r c1@AAv2

T ,1@AAv $rvides highclck acc"racy in a $acketnet'rk

The Igrandmaster clckJgenerates timestam$s and

res$nds t re;"ests Enly b"ndary clcks need t

be a'are * the nat"re *$ackets

8change * timestam$ $acketsens"res all ndes retain

*re;"ency and $hase acc"racy Enly ndes that need time

in*rmatin need t be"$graded

!N )asestatin

randmasterClck

121

3

1

>

2

@K

12 1

3

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>

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acket

ack

et

acket

acket

12


13/20


acket Delay Lariatin

hase timing re;"ires l' DL ntlatency Lariatin in end=t=end delay

!symmetry * delay variatin"$link7d'nlink

Cnse;"ences Sync ac;"isitin time( recvery time

S$eciMcatins revi"sly end=t=end

ecently changed t I$er h$J


14/20


ync rn"s erne,Sync

!ll $rts in the link m"st beSync enabled

Sync is a gdcm$rmise bet'een TD/and thernet

t $rvides *re;"encysynchrnisatin at the$hysical layer

/anaging Sync cansigniMcantly increasenet'rk TCE

Sync

Sync

Sync

Sync

!N )asestatin

!N NC

1>


15/20


"estin 42

D signals travel *aster7sl'er7samed'n $tical Mbre than via micr'ave

link5


16/20


!ns'er 42

D signals travel *aster7sl'er7samed'n $tical Mbre than via micr'ave

link5

iven:

?ight 'aves are reected Hthe sides * $tical Mbre( s travel

*"rther than direct raditransmissins

!ns'er: Sl'er


17/20


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esidentialSmall Cell

nter$riseSmall Cell

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Cl"d !N

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@0$$b70.@s

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TD=?T

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@0$$b71.@ t@s

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NT

E$tinally NSS

NSS andT , 1@AAv2

#re;"encySync

#re;"enc

y Ohase

Dark#ibre


18/20


"estin 43

9hat is the -!S hldver time * anscillatr 'ith #NCP hldver *1 mnth5

1 9eek 12-"rs

1 -"r1 Day


19/20


Cmmercial Escillatr S$eciMcatins

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20/20


Cncl"sin

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n=b"ilding:esidential 37S- NTnter$rise NT r T7Sync

rban:Cmbinatin *

NSS7Sync71@AA)ackha"l Sync71@AA ca$able

hase Sync:Demands better scillatr

hldver

Cl"d !N needs dark Mbre t

Documents

Small Cell Timing and Sync Presentation SCA