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8/17/2019 4 Synchronization of 2G 3G GSM Networks
http://slidepdf.com/reader/full/4-synchronization-of-2g-3g-gsm-networks 1/22
PolyNet Ltd.Synchronization of 2G 3G
GSM networks
Network Synchronization Training
Zoltán Zorkóczy
Viktor Szigeti
8/17/2019 4 Synchronization of 2G 3G GSM Networks
http://slidepdf.com/reader/full/4-synchronization-of-2g-3g-gsm-networks 2/22
2012 Vodafone Malta
Content
Similarities and differences
TDM art secialties
!adio access secialties
Some meas"rement res"lt
8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
GSM Switch network as a PSTN chain
1
3 3 3
222
R R RR
Main MS
!"#12 T $ !"#11
Secondary MS%
!"#12 T$!"#12$&
'S%
()* N+
'TS%S,ecial
-%er
S,ecial
(STN network
8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
2G GSM synchronization e#ol"tion
Main MS!"#12 T$!"#12$ &
.ro/ (STN
Secondary MS%
!"#12 T$!"#12$&.ro/ (STN
'S%
()* N+
.ro/ MS
'TS%
Ridi/ clock
.ree rn
Main MS!"#11
tono/o%
Secondary MS%
!"#12 T$!"#12$&.ro/ Main MS
'S%
()* N+
.ro/ MS
'TS%
4
.ro/ +1
Main MS!"#11
!(S$(STN
Secondary MS%
!"#11.ro/ Main MS$!(S
'S% 5re/ote6
Mini SS-
.ro/ MS$!(S
'TS%
4
.ro/ +1
8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
The ori$in of 2G sync re%"irements
Radio fre7ency accracy 8 hannel cro%%9talk Ti/ing %taility 8 *and9o:er %cce%%
To en%re the ao:e re7ire/ent%;
1"6 ,,ly high free rnning accracy 5atono/o%6 'a%eStation lock 8 the network can %tart , withotadditional %ynchronization
2"6 Synchronize the 'a%e Station lock fro/ inco/ing
T)M %trea/ that di%trite% the ti/ing %ignal and%orced fro/ the network<% (ri/ary Reference lock5(R6 8 The 'a%e Station lock<% accracy will e threeorder of /agnitde etter in tracking %tate than in freern /ode"
8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
GSM &ase station timin$ re%"irements
S,ecification i% according to +TS 300 =>? a% original%tandard
Radio clock free rnning accracy =0 ,, 5=+9#@ =0
n%$%6 for .)) ,erfor/ance
An,t interface Bitter and wander acce,tance i%
according to !"#23 %ynchronization interface a%
/ini// re7ire/ent for %ynchronizing@ and !"#23data interface li/it for data eCchange" An ,ractice the
in,t wander acce,tance i% etween the two li/it%"
8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
Minim"m re%"irement to 2G 'TS timin$
0@1 1 10 102 103 10D 10=
1
()*@ !"#23 %ync interface
S+@ !"#13
!"#12
SS- +N 300 DE2"D
(R !"#11
10
102
103
MTA+
5n%6
%er:ation inter:al 5%6
=+9#fre7ency
off%et for
.))
!"#23 data interface ot10D
N o k i a 2 ! ' T
S t o l e r a 1 l e i n
, 0 t w a n d e r
8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
(re%"ency trackin$ of a 2G 'TS clock
2@ 2 F 1 0 9
1 0
9 3 @3 F 1 0 9 1 0 9 3 F 1 0 9 1 0
Mea%ring ti/e 5%6
Radio clock tracking re%lt /ea%red on the 13 M*z te%t
ot,t of the 2E M*z internal clock of the a%e %tation
8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
Test wander samle
Mea%ring ti/e 5%6
8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
)ander sensiti#ity of a 2G 'TS clock *
Mea%ring ti/e
1000 n%,, wander %witched on
= @ 3 + 9
?
Radio clock tracking error /ea%red on the 13 M*z te%t
ot,t of the 2E M*z internal clock of the a%e %tation
8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
Mea%ring ti/e
#000 n%,, wander on traffic in,t DF109#
1F109>
)ander sensiti#ity of a 2G 'TS clock 2
Radio clock tracking error and %ync lo%% re%lt /ea%red on the 13 M*z te%t
ot,t of the 2E M*z internal clock of the a%e %tation
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2012 Vodafone Malta
2G MSC so"rce chan$e and holdo#er
Sorce change
Switch to holdo:er
Mea%ring ti/e 5%6
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2012 Vodafone Malta
2G 'SC so"rce chan$e
Sorce change end
Tracking Tracking
Start to %witcho:er
Switch to tracking
Mea%ring ti/e 5%6
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2012 Vodafone Malta
De$raded transort %"ality to 'TS
TA+@ MTA+ and T)+V re%lt
on the +1 ot,t of a /icrowa:e
radio link
The 7ality i% degraded y
the %,ecial ti/ing
tracking /ethod of the
e7i,/ent ty,e
8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
2G 'TS wander sensiti#ity affect on GP!S download
seed
92@1G
93@=G
90@DG
90@#G
S,eed
5'yte$%6
1 2 3 D
Ty,e of a%e %tation%
8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
2G 'TS wander sensiti#ity affect on +DG+
download seed
91@=G
S,eed
5'yte$%6
Hander load on 'TS traffic in,t
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8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
Timin$ re%"irements of GSM 'ase Stations- 2G 3G
Re7ire/ent%; +TS 300 =>? 8 the fir%t %tandard
Radio clock<% free rn accracy; =0 ,,
5=+9#@ =0 n%$%6 for the ,ro,er .))F fnction
()* in,t Bitter and wander tolerance
according to the !"#23 %ync interface
dditional re7ire/ent TS 12="D02I'EJ;
.or ,ro,er o,eration of T))F and /acro di:er%ity the
relati:e ,ha%e difference etween two Node9' cannot eCceed 2@= K% 5L1"2= K%6"
2!
2!
2!
3!
.))F .re7ency )i:i%ion ),leC
T))F Ti/e )i:i%ion ),leC
8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
Minim"m re%"irement to 2G 'TS timin$
0@1 1 10 102 103 10D 10=
1
()*@ !"#23 %ync interface
S+@ !"#13
!"#12
SS- +N 300 DE2"D
(R !"#11
10
102
103
MTA+
5n%6
%er:ation inter:al 5%6
=+9#
fre7ency
off%et for
.))
!"#23 data interface ot10D
N o k i a 2 ! ' T
S t o l e r a 1 l e i n
, 0 t w a n d e r
8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
Node,' timin$ re%"irement
0@1 1 10 102 103 10D 10=
1
()*@ !"#23 %ync interface
S+@ !"#13
!"#12
SS- +N 300 DE2"D
(R !"#11
10
102
103
MTA+
5n%6
%er:ation inter:al 5%6
=+9#
fre7ency
off%et for
.))
2@=K% to T))
and /acro di:er%ity
!"#23 data interface ot10D
Node9' re7ire/ent
N o d e 9 ' t y , i c
a l
t o l e r a 1 l e i n ,
0 t w a n d e r
.iltered y the ti/ing regeneration
,erfor/ance of the Node9'
N o k i a 2 ! ' T
S t o l e r a 1 l e i n
, 0 t w a n d e r
8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
System or$anizin$ for cost effecti#e oeration
Synchroni%inge7i,/ent
Node9'The fnction% of ti/ing;
+rror free data eCchange
Anterference free radio TC$RC
.)) TC$RC
T)) TC$RCQuality parameters:
.ree rn accracy
Tracking ,erfor/ance
Tran%ient in%taility
%olte ti/ing
*oldo:er ti/e
.or o,ti/izing the ,rice 9 ,erfor/ance alance
alway% %e the ti/ing %er:ice% in Node9'% ,re%ent
=+9#
Mini// S+
2@=K% /aC
2@=K% /aC for T))
Hhere are awaiting fro/
Quality parameters:
.ree rn accracy
Tracking ,erfor/ance
Tran%ient in%taility
%olte ti/ing
*oldo:er ti/e
8/17/2019 4 Synchronization of 2G 3G GSM Networks
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2012 Vodafone Malta
Concl"sions / what to do0
1f the 'TSNode' e%"ied with inte$rated GPSclock "se it for timin$. 1f TDM network element a#aila&le at a $i#en
station "se its eternal sync o"t"t for Node,'timin$.
1f non of the a&o#e a#aila&le imlement standaloneGPS clock for Node' synchronization.
1n case of sync +thernet &ackha"l make s"re thatits %"ality is in line with rec. 1T4,T 5262.
4se 1+++ *755 recision time rotocol if it isa#aila&le in the eistin$ transortaccess media or"se eternal comonents to ens"re the re%"iredtimin$ si$nal %"ality.
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