4 Synchronization of 2G 3G GSM Networks

8/17/2019 4 Synchronization of 2G 3G GSM Networks

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PolyNet Ltd.Synchronization of 2G 3G

GSM networks

Network Synchronization Training

Zoltán Zorkóczy

Viktor Szigeti



2012 Vodafone Malta

Content

Similarities and differences

TDM art secialties

!adio access secialties

Some meas"rement res"lt



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



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



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"



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%"



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



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



2012 Vodafone Malta

Test wander samle

Mea%ring ti/e 5%6



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




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




2012 Vodafone Malta

2G MSC so"rce chan$e and holdo#er

Sorce change

Switch to holdo:er

Mea%ring ti/e 5%6



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



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



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%



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



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



2012 Vodafone Malta

Minim"m re%"irement to 2G 'TS timin$

0@1 1 10 102 103 10D 10=

1


S+@ !"#13

!"#12

SS- +N 300 DE2"D

(R !"#11

10

102

103

MTA+

5n%6


=+9#

fre7ency

off%et for

.))


N o k i a 2 ! ' T


, 0 t w a n d e r



2012 Vodafone Malta

Node,' timin$ re%"irement

0@1 1 10 102 103 10D 10=

1


S+@ !"#13

!"#12

SS- +N 300 DE2"D

(R !"#11

10

102

103

MTA+

5n%6


=+9#

fre7ency

off%et for

.))

2@=K% to T))

and /acro di:er%ity


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


, 0 t w a n d e r



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



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.

4 Synchronization of 2G 3G GSM Networks

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