small cell timing and sync presentation sca
TRANSCRIPT
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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
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7/24/2019 Small Cell Timing and Sync Presentation SCA
2/20
2013 Small Cell Americas, Dallas, Dec
!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
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7/24/2019 Small Cell Timing and Sync Presentation SCA
3/20
2013 Small Cell Americas, Dallas, Dec
"estin 41
-' *ar des a radi 'ave travel in 1nansecnd5
! *t
! yard
! mile
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7/24/2019 Small Cell Timing and Sync Presentation SCA
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2013 Small Cell Americas, Dallas, Dec
!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$$r8 1 *t
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7/24/2019 Small Cell Timing and Sync Presentation SCA
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2013 Small Cell Americas, Dallas, Dec
9hy Timing and Sync5
nd ser8$erience- Seamless
-andvers- #e'er
Dr$$ed calls
-!vid datastreamglitches
S$ectral+ciency- S;"ee
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7/24/2019 Small Cell Timing and Sync Presentation SCA
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2013 Small Cell Americas, Dallas, Dec
The Three levels * Sync
None Frequency Frequency & Phase9i=#i 3 /TS 3 CD/!
)l"etth 3 TD=SCD/!
> #DD ?T TD=?T
?T=!dvanced
!t the same time(backha"l transmissinis migrating *rm T171
t thernet
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7/24/2019 Small Cell Timing and Sync Presentation SCA
7/20
2013 Small Cell Americas, Dallas, Dec
Three Cm$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$endently- NSS- Neighb"r Cellsite Sni+ng
#DD- DesnBt ,al'ays
re;"ire hase Sync
TDD- e;"ires hase Sync
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7/24/2019 Small Cell Timing and Sync Presentation SCA
8/20
2013 Small Cell Americas, Dallas, Dec
e ange m ngTlerances
esidentialSmallCell
nter$riseSmall Cell
rbanSmall Cell
Cl"d !N
3 2@0$$b 100$$b @0$$b @0$$b
?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
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7/24/2019 Small Cell Timing and Sync Presentation SCA
9/20
2013 Small Cell Americas, Dallas, Dec
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
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7/24/2019 Small Cell Timing and Sync Presentation SCA
10/20
2013 Small Cell Americas, Dallas, Dec
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
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7/24/2019 Small Cell Timing and Sync Presentation SCA
11/20
2013 Small Cell Americas, Dallas, Dec
Sme $r S installatins
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7/24/2019 Small Cell Timing and Sync Presentation SCA
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2013 Small Cell Americas, Dallas, Dec
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
1
>
2
@K
acket
ack
et
acket
acket
12
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7/24/2019 Small Cell Timing and Sync Presentation SCA
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2013 Small Cell Americas, Dallas, Dec
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
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7/24/2019 Small Cell Timing and Sync Presentation SCA
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2013 Small Cell Americas, Dallas, Dec
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>
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7/24/2019 Small Cell Timing and Sync Presentation SCA
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2013 Small Cell Americas, Dallas, Dec
"estin 42
D signals travel *aster7sl'er7samed'n $tical Mbre than via micr'ave
link5
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7/24/2019 Small Cell Timing and Sync Presentation SCA
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2013 Small Cell Americas, Dallas, Dec
!ns'er 42
D signals travel *aster7sl'er7samed'n $tical Mbre than via micr'ave
link5
iven:
?ight 'aves are reected Hthe sides * $tical Mbre( s travel
*"rther than direct raditransmissins
!ns'er: Sl'er
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7/24/2019 Small Cell Timing and Sync Presentation SCA
17/20
2013 Small Cell Americas, Dallas, Dec
e ange m ngTlerances
esidentialSmall Cell
nter$riseSmall Cell
rbanSmall Cell
Cl"d !N
3 2@0$$b 100$$b @0$$b @0$$b
?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
NT
E$tinally NSS
NSS andT , 1@AAv2
#re;"encySync
#re;"enc
y Ohase
Dark#ibre
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7/24/2019 Small Cell Timing and Sync Presentation SCA
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2013 Small Cell Americas, Dallas, Dec
"estin 43
9hat is the -!S hldver time * anscillatr 'ith #NCP hldver *1 mnth5
1 9eek 12-"rs
1 -"r1 Day
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7/24/2019 Small Cell Timing and Sync Presentation SCA
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2013 Small Cell Americas, Dallas, Dec
Cmmercial Escillatr S$eciMcatins
Oscia!or Ty"eFreq#
vs
Te$"#%ging
Ti$e !o each Phase Error'i$i!
,Q20RC. variatin errr limit at10RC7h"r 2ours
o*over
,Calm !ir1 +s , +s - +s
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2h"rs
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Source0
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7/24/2019 Small Cell Timing and Sync Presentation SCA
20/20
2013 Small Cell Americas, Dallas, Dec
Cncl"sin
rbanSmall Cell
Cl"d !N
n=b"ilding:esidential 37S- NTnter$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