12_pcu ggsn and sgsn dim

038 13 - EN/LZU 108 5402 Rev A GRPS Dimensioning and Performance Workshop

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SGSN GGSN

BSC MSC/VLR

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AA’’

HLR

SMS-GMSCSMS-IWMSC

New HW

New SW

IPNetwork

Backbone Network

IPGd (MAP)

MS

SOG


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General Packet Radio ServicesGeneral Packet Radio Services

Packet Control Unit


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Gs i/f. Optional

GMSC

MSC

GGSNGGSN

SGSNSGSN

BSC

BTS

...

PCU

A i/f Gb i/f

A-bis i/f


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SRS

ETC

ETC

GSL Dev

Gb Dev

RPP

GSL Dev

GSL Dev

RPP

ETC

GS

TRA

A-bis Interface

n x 16 kbps

WidebandFrame Relay

Gb Interface

MSC

64 Kbps


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RPP board

Ethernet backplanein PCU magazine

DL2interfaces

DSP capacity for GSL interface

up to 150 16kb/s TS (pooled)

DSP capacity for Gb interface

up to 31 64kb/s TS (E1)

PPC 750PPC 750

2 Mbps towards GSL only

2 Mbps towards GSL and/or Gb

DSPDSP

DSPDSP


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\ DL2 number one (only GSL)

100 GSL devices

\ DL2 number two (Gb + GSL)

18 Gb TS devices

50 GSL devices


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15 30 45 60Min

BH data rateper PCU

Peak

BH mean

Peak factor


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The Gb-interface should always have at least the capacity required on the Abis-interface


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0

31RPP-0

(100 GSL)31 Gb TS

RPP-1 (141 GSL)

RPP-0

RPP-1 31 TS on Gb-i/f

Gb

1

1*E1 (=1 PVC)


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GSL devices requiredGSL configuration per RPP


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GPRS subs * data load per sub * peak factor * Gb OH 64 kbit/s * Gb TS link load factor

Gb timeslots requiredGb configuration per RPP


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Max(#RPPGSL ; #RPPGb)


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Prev. SRS util. + (#DPDCH + #ODPDCH)/4 < 3680 MUPs

or

Prev. SRS util. + #RPP * 40 < 3680 MUPs


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Determine if TRXs are needed to be addedin the Radio Network depending on the needof PDCHs.

This activity is performed in close co-operation withRadio Network Design.



GPRS Support Nodes


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*Average packet size of 300 bytes

GSN1.0 SAU PDP Packet/s (max throughput)CGSN 10 000 10 000 4 200


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CGSN1.0CGSN1.0

SGSN2.0SGSN2.0GGSN2.0GGSN2.0

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Shaded units are selectable dependingon type of interface required.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

PEB

PEB

PEB

PEB

IBx1

Gb

IBx1

Gb

IBx1

Gb

IBx1

Proc./Gi

IBx1

Proc./Gi

IBx1

Gb

GPB

Red.

GPB

Charg.

GPB

Charg.

GPB

NCBAtt/DetGPB

NCBAtt/Det

IBxx

Gn(/Gom)

IBxxRed.Gn

(/Gom)

IBxx

Red.Gi

IBxx

Gi

IBx1

SS7

IBx1

SS7

IBx1

Gb



GSN Interfaces


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BTS

SGSN

MS

BSC

Gb


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Gb Protocol Protocol Protocol Protocol Protocol Protocol Protocol Mean packetOH OH OH OH OH OH OH size Total OH

FR point-point BSSGP NS FR42,5 4 6 300 18%

FR Ethernet BSSGP NS FR Ethernet42,5 4 6 18 300 24%

FR ATM BSSGP NS FR ATM *42,5 4 6 30 300 28%


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Gn Protocol Protocol Protocol Protocol Protocol Protocol Protocol Mean packetOH OH OH OH OH OH OH size Total OH

IP over PPP IP PPP Ipsec *20 8 20 300 17%/21%

IP over FR IP FR Ipsec *20 6 20 300 17%/21%

IP over Ethernet IP Ethernet Ipsec *20 18 20 300 21%/25%

IP over ATM IP ATM Ipsec *

GTP UDP/TCP16 8/20

GTP UDP/TCP16 8/20

GTP UDP/TCP16 8/20

GTP UDP/TCP16 8/20 20 30 20 300 25%/29%


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Gi Protocol Protocol Protocol Protocol Protocol Protocol Protocol Mean packetOH OH OH OH OH OH OH size Total OH

IP over PPP PPP Ipsec *8 20 300 3%

IP over FR FR Ipsec *6 20 300 2%

IP over Ethernet Ethernet Ipsec *18 20 300 6%

IP over ATM ATM Ipsec *30 20 300 10%


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Gp Protocol Protocol Protocol Protocol Protocol Protocol Protocol Mean packetOH OH OH OH OH OH OH size Total OH

IP over PPP UDP/TCP IP PPP Ipsec8/20 20 8 20 300 24%/28%

IP over FR UDP/TCP IP FR Ipsec8/20 20 6 20 300 23%/27%

IP over Ethernet UDP/TCP IP Ethernet Ipsec8/20 20 18 20 300 27%/25%

IP over ATM UDP/TCP IP ATM Ipsec

GTP16

GTP16

GTP16

GTP16 8/20 20 30 20 300 31%/35%


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BTS

SGSN

BSC MSC/VLR

MS Gs


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BTS

SGSN

BSC

SMS-GMSCSMS-IWMSC

MS


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UpdateGPRSLocationInsertSubscriberDataDeleteSubscriberDataSendParametersResetCancelLocationReadyForSM

BTS

SGSN

BSC

MS

Gr

MSC/VLR

HLR


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Utilization of STP-functionality for GSN/C7 signalling

673

+/5�

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606

673

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66��,QSXW�3DUDPHWHUVSlogan Name UnitMaximum number of attached subscribers MaxNbOfAttMS

Time to attach and activate PDP context all subscribers TimeToAttach min

Number of MO SMS messages per hour and attached subscriber NbOfMoSm 1 / h

Number of MT SMS messages per hour and attached subscriber NbOfMtSm 1 / h

Number of routing area updates per subscriber and hour NbOfRau 1 / h

Number of inter-SGSN routing-area updates per subscriber and hour NbOfInterSgsnRau 1 / h

Number of location area updates per subscriber and hour NbOfLau 1 / h

Number of attach/detach per hour NbOf_Attach 1 / h

Number of attach/detach with change of SGSN per subscriber and hour NbOfAttachCl 1 / h

Frequency of purging one subscriber NbOfPurgedMs 1 / h

Number of A&B type terminals NbOfAB_Ms

Number of busy hour call attempts per subscriber in MSC BHCA_Msc 1 / h

Number of authentication triplets received after one request NbOfTriplets

Slogan Name UnitMaximum number of attached subscribers MaxNbOfAttMS

Time to attach and activate PDP context all subscribers TimeToAttach min

Number of MO SMS messages per hour and attached subscriber NbOfMoSm 1 / h

Number of MT SMS messages per hour and attached subscriber NbOfMtSm 1 / h

Number of routing area updates per subscriber and hour NbOfRau 1 / h

Number of inter-SGSN routing-area updates per subscriber and hour NbOfInterSgsnRau 1 / h

Number of location area updates per subscriber and hour NbOfLau 1 / h

Number of attach/detach per hour NbOf_Attach 1 / h

Number of attach/detach with change of SGSN per subscriber and hour NbOfAttachCl 1 / h

Frequency of purging one subscriber NbOfPurgedMs 1 / h

Number of A&B type terminals NbOfAB_Ms

Number of busy hour call attempts per subscriber in MSC BHCA_Msc 1 / h

Number of authentication triplets received after one request NbOfTriplets


Gr Attach Sent Received Frequency1) Authentication 81 245 MaxNbOfAttMS * (NbOfAttachCI / 3600) / NbOfTriplets

Update location 128 75 MaxNbOfAttMS * (NbOfAttachCI / 3600)Insert Subscriber Data 82 273 MaxNbOfAttMS * (NbOfAttachCI / 3600)

or2) Cancel Location 105 119 MaxNbOfAttMS * (NbOfAttachCI / 3600)

3) Purge MS- 119 105 MaxNbOfAttMS * (NbOfAttachCI+NbOfPurgedMs / 3600)

Detach- 0 0 -

Inter-SGSN Routing-Area roaming4) Authentication 81 245 MaxNbOfAttMS * (NbOfInterSgsnRau / 3600) / NbOfTriplets

Update location 128 75 MaxNbOfAttMS * (NbOfInterSgsnRau / 3600)Insert Subscriber Data 82 273 MaxNbOfAttMS * (NbOfInterSgsnRau / 3600)

or5) Cancel Location 105 119 MaxNbOfAttMS * (NbOfInterSgsnRau / 3600)

Gr Attach Sent Received Frequency1) Authentication 81 245 MaxNbOfAttMS * (NbOfAttachCI / 3600) / NbOfTriplets

Update location 128 75 MaxNbOfAttMS * (NbOfAttachCI / 3600)Insert Subscriber Data 82 273 MaxNbOfAttMS * (NbOfAttachCI / 3600)

or2) Cancel Location 105 119 MaxNbOfAttMS * (NbOfAttachCI / 3600)

3) Purge MS- 119 105 MaxNbOfAttMS * (NbOfAttachCI+NbOfPurgedMs / 3600)

Detach- 0 0 -

Inter-SGSN Routing-Area roaming4) Authentication 81 245 MaxNbOfAttMS * (NbOfInterSgsnRau / 3600) / NbOfTriplets

Update location 128 75 MaxNbOfAttMS * (NbOfInterSgsnRau / 3600)Insert Subscriber Data 82 273 MaxNbOfAttMS * (NbOfInterSgsnRau / 3600)

or5) Cancel Location 105 119 MaxNbOfAttMS * (NbOfInterSgsnRau / 3600)

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*V�66��GLPHQVLRQLQJ��RQO\�IRU�*61�5��Gs Location Update Sent Received Frequency1) Location Update 95 78 NbOfAB_Ms / (TimeToAttach * 60)

TMSI-Reallocation completed 71 0 NbOfAB_Ms / (TimeToAttach * 60)

2) AttachLocation Update 95 78 NbOfAB_Ms * (NbOf_Attach / 3600)TMSI-Reallocation completed 71 0 NbOfAB_Ms * (NbOf_Attach / 3600)

3) Detach (MS-initiated)IMSI detach 85 0 NbOfAB_Ms * (NbOf_Attach / 3600)GPRS detach 85 0 NbOfAB_Ms * (NbOf_Attach / 3600)

4) Location Area UpdateLocation Update 95 78 NbOfAB_Ms * (NbOfInterSgsnLau / 3600)TMSI-Reallocation completed 71 0 NbOfAB_Ms * (NbOfInterSgsnLau / 3600)

5) PagingPaging Request 0 88 NbOfAB_Ms * (BhcaMsc / 3600)

Gs Location Update Sent Received Frequency1) Location Update 95 78 NbOfAB_Ms / (TimeToAttach * 60)

TMSI-Reallocation completed 71 0 NbOfAB_Ms / (TimeToAttach * 60)

2) AttachLocation Update 95 78 NbOfAB_Ms * (NbOf_Attach / 3600)TMSI-Reallocation completed 71 0 NbOfAB_Ms * (NbOf_Attach / 3600)

3) Detach (MS-initiated)IMSI detach 85 0 NbOfAB_Ms * (NbOf_Attach / 3600)GPRS detach 85 0 NbOfAB_Ms * (NbOf_Attach / 3600)

4) Location Area UpdateLocation Update 95 78 NbOfAB_Ms * (NbOfInterSgsnLau / 3600)TMSI-Reallocation completed 71 0 NbOfAB_Ms * (NbOfInterSgsnLau / 3600)

5) PagingPaging Request 0 88 NbOfAB_Ms * (BhcaMsc / 3600)

NbOfAB_Ms * (NbOf_Attach / 3600)NbOfAB_Ms * (NbOf_Attach / 3600)


*G�66��GLPHQVLRQLQJ

Gd SMS Sent Received FrequencyMobile Originating 219 101 MaxNbOfAttMS * (NbOfMoSm / 3600)Mobile Terminating 101 219 MaxNbOfAttMS * (NbOfMtSm / 3600)

Gd SMS Sent Received FrequencyMobile Originating 219 101 MaxNbOfAttMS * (NbOfMoSm / 3600)Mobile Terminating 101 219 MaxNbOfAttMS * (NbOfMtSm / 3600)


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*V�,QWHUIDFH�XVDJHMobiles Gs-interface usageClass A

No speech connection – combined Routing Area / Location Area update to the SGSN which will inform the MSC through the Gs-interface

Speech connection – Routing Area update in SGSN only, in case of Hand-Over the MSC is informed through the A-interface.

Class BNo speech connection – combined Routing Area / Location Area update to the SGSN which will inform the MSC through the Gs-interface

Speech connection – In case of Hand-Over the MSC is informed through the A-interface.

Class CNo speech connection – Routing Area update to the SGSN


Mobiles Gs-interface usageClass A

No speech connection – combined Routing Area / Location Area update to the SGSN which will inform the MSC through the Gs-interface

Speech connection – Routing Area update in SGSN only, in case of Hand-Over the MSC is informed through the A-interface.

Class BNo speech connection – combined Routing Area / Location Area update to the SGSN which will inform the MSC through the Gs-interface


Class CNo speech connection – Routing Area update to the SGSN



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Dimensioning Example

New T elecom World


Subscriber Forecast (subs)Total users 2 000 000GPRS users (10%) 200 000Simultaneously Attached Users (50%) 100 000# of PDP-context (1 per SAU) 100 000

,QSXW

Geographical DistributionWAP Town 60%High Speed City 13%Packet Data Village 27%


,QSXW

Traffic ModelApplication data (bit/s/BH/user) 200Peak data load factor 3

Number of BSCsWAP Town 8High Speed City 4Packet Data Village 4


)XUWKHU�$VVXPSWLRQV

n 0HDQ�SDFNHW�VL]H� ��E\WHV

n 0HDQ�&6��DSSOLFDWLRQ�� NESV�3'&+�GDWD�SD\ORDG

n *E�76�OLQN�ORDG� ��


n 6LQFH�PHDQ�&6��SD\ORDG�LV��NESV�3'&+�ZH�ZLOO�XVH$OWHUQDWLYH��WR�JHW�DV�PDQ\�FKDQQHOV�SHU�533�DQG�DV�IHZ533V�DV�SRVVLEOH�

:LWK�5*6/� ��[� �� \� ��

76� ��*6/� ��

GSL = 100 + (31-TS)*4

3&8�'LPHQVLRQLQJ��:$3�7RZQ�

( )RGSLy

x

RGSLTS

×+

×

×=4

%%

64

224


n &DOFXODWH�QXPEHU�RI�*6/�GHYLFHV�QHHGHG�SHU�UHJLRQ�

n &DOFXODWH�QXPEHU�RI�533V�UHTXLUHG�

GPRS subs * data load per sub * peak factor * Abis OH PDCH load

3&8�'LPHQVLRQLQJ��:$3�7RZQ��

(2000000 * 10% * 50% * 60%) * (200 bits/s) * (3) * (1.1) 7000 bits/s

= 5658 GSL devices

=

=

GSL devices required 5658 GSL configuration per RPP 140

# RPPGSL = = = 41

=


n &DOFXODWH�WKH�QXPEHU�RI�*E�76�QHHGHG�SHU�UHJLRQ

n &DOFXODWH�QXPEHU�RI�533V�UHTXLUHG�


(2000000 * 10% * 50% * 60%) * (200 bits/s) * (3) * (1.20) 64 kbits/s * 80%

= 844 Gb timeslots

=

=

GPRS subs * data load per sub * peak factor * Gb OH64 kbits/s * Gb link load

Gb timeslots required 844 Gb configuration per RPP 21= = = 41# RPPGb

=

(FR+BSSGP)


n 'HWHUPLQH�QXPEHU�RI�533V�UHTXLUHG�SHU�%6&�

$�3&8�PDJD]LQH�ZLWK��533�LV�UHTXLUHG�LQ�HDFK�%6&

LQ�:$3�7RZQ�

Max(41; 41) 8


Max(#RPPGSL ; #RPPGb) Number of BSCs in WAP Town

=

=# RPPBSC =

= 6


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0

31

1*E1

0

0

0

1*E1

1*E1

1*E1

RPP-0 (100 GSL, 31 Gb TS) RPP-1a (107 GSL)

RPP-2 (100 GSL, 31 Gb TS) RPP-1b (43 GSL) RPP-3a (64 GSL)

RPP-4 (100 GSL, 31 Gb TS) RPP-3b (86 GSL) RPP-5a (21 GSL)

RPP-5b (87 GSL, 13 Gb TS)


$OWHUQDWLYH��(�V��533

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n &*61��6$8�� &*61

n &*61��3'3�� &*61

New Telecom World



'LPHQVLRQ�FRQVLGHULQJ��SDFNHWV�

GPRS subs * data load per sub * peak factor# bytes per packet * 8

#Packets on Gb =

=

(2 000 000 * 10% * 50%) * (200 bits/s) * (3)300 * 8

=

= 25 000 packets/s

New Telecom World


Dimension considering #packets (continued):


n &*61��SDFNHWV�� &*61

New Telecom World



� &*61��6$8�� &*61

� &*61��3'3�� &*61

� &*61��SDFNHWV�� &*61

��&*61VEnough to meetrequired capacity demandResult

New Telecom World


*61�'LPHQVLRQLQJ�RWKHU�FRQVLGHUDWLRQV

n Number of BSCs connected to SGSN

n Number of E1 required to connect to other nodes

n Amount of C7 terminals for the Gs, Gd and Gr I/f

$QG�QRZ��


*356�:RUNVKRS�+:�QRGH�'LPHQVLRQLQJ�([HUFLVH

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The exercise isincluded in the

binder

12_pcu ggsn and sgsn dim

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