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Transcript of Sgs n Training
For internal use1 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Serving GPRS Support Node (SGSN)
For internal use2 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Agenda
GPRS Introduction – Duration 1 hourGSM Network architecture Circuit core vs Packet coreGPRS network elements
Overview of GPRS network architecture Brief functionality of all nodes
GPRS Traffic Management – Duration 2 hoursMobility Management in SGSN
LAC/ RAC overview Mobility management states GPRS location update call flows
Session Management in SGSN PDP Context activation PDP Context deactivation PDP Context modification
Charging Online Charging in SGSN Offline Charging in SGSN
Lawful Interception
For internal use3 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Agenda
NSN SGSN Introduction – Duration 2 hoursSGSN Network InterfacesSGSN Hardware Architecture
Hardware modules overview Detailed functionality of each module Redundancy in various hardware modules
SGSN Logical Architecture Mapping of hardware modules with external interfaces Brief on interworking of various hardware modules
SGSN O&M Logging in SGSN Understanding SGSN CLI Most used commands Sample Configurations Examples of troubleshooting
Hands On Session – Duration 1 hours
For internal use4 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
GPRS Introduction - GSM Network architecture
The main elements of Network Switching Subsystem are:
Mobile Services Switching Centre (MSC) Visitor Location Register (VLR) Home Location Register (HLR)
The Base Station Subsystem consists of the following elements:
Base Station Controller (BSC) Base Transceiver Station (BTS) Transcoder (TC)
For internal use5 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
GPRS Introduction - Circuit core vs Packet core
Packet switched vs circuit switched
Circuit-switched connections are routed via MSC Packet-switched connections are routed via SGSN RAN part is shared between CS and PS traffic
IN SCP
GGSN
GSMmobil
e
UMTSmobil
e
GSM / UMTSmobil
e
GSM BTS
UMTS RANUMTS
BS
InternInternetet
(TCP/(TCP/IP)IP)
MSMSSS
HLHLRR
SRSRRR
GSM/GPRS BSS
BBSSCC
BBSSCC
GSM BTS
UMTS BS
RNRNCC
RNRNCC
Landline NWLandline NWPSTN/ISDNPSTN/ISDN
MGMGWW
SGSN
3G SGSN
GPRS GPRS BackbBackboneone
Network Network SubsystemSubsystem
For internal use6 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Main SGSN functions
• mobility management
• session management
• charging (post-paid, prepaid)
• statistics
• 2G compression
• authentication
• 2G ciphering
• SMS handling
For internal use7 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
GPRS Network
HLR/AuCEIR
MSC/ VLR
SGSN
Gateway GPRSSupport Node(GGSN)
Lawful InterceptionGateway (LIG)
Datanetwork(Internet)
PSTNNetwork
SS7Network
Billing System
BSCBTS
Datanetwork(Internet)
DNS Domain name server
SGSN
Service Control Point (SCP)
RNC
NODE B
Border Gateway (BG)
GPRSbackbonenetwork
(IP based)
Inter-PLMN BB
Charging Gateway (CG)
For internal use8 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
GPRS Traffic Management - Mobility Management
LAC/ RAC overview
The relationship between Cell, RA, LA, and SGSN coverage area :
Cell Routing area Location area ⊂ ⊂ ⊂MSC coverage area
Cell Routing area SGSN coverage ⊂ ⊂area
RAI = MCC + MNC + LAC + RAC
Where RAC is Routing Area Code The RAI is LAI + RAC. The RAI is of fixed length - 15 digits.
For internal use9 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
GPRS Traffic Management - Mobility Management
Mobility management states:
Idle State Ready State Standby State
Idle StateStandby State
Ready State
For internal use10 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
STANDBY
IDLE
READY
Implicit detach Implicit detach or cancel or cancel locationlocation
GPRS AttachGPRS Attach
READY timer expiryREADY timer expiryORORForce to standbyForce to standbyORORAbnormal RLC Abnormal RLC conditioncondition
PDU receptionPDU reception
GPRS DetachGPRS DetachORORCancel LocationCancel Location
GPRS Traffic Management - Mobility Management
For internal use11 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
The procedures of Mobility Management are:
GPRS Attach/ GPRS Detach
Purge
Security Authentication subscriber identity confidentiality Ciphering (2G only) Identity check.
Location management
PS Paging
Normal/periodic routing area update.
Subscriber Management
Interaction with MSC/VLR
IMSI attach/detach, combined IMSI/GPRS attach/detach
Combined routing area and location area update
CS paging
Non-GPRS alert
GPRS Traffic Management - Mobility Management
For internal use12 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
GPRS Traffic Management - Mobility Management
GPRS Attach Procedure (MS Initiated)
For internal use13 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
GPRS Traffic Management - Mobility Management
GPRS Detach Procedure (MS Initiated)
GPRS Detach Procedure (HLR Initiated)
For internal use14 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
The MS is detached from GPRS either explicitly or implicitly:
• Explicit detachExplicit detach: The network or the MS explicitly requests detach specifying the cause for it
• Implicit detachImplicit detach: The network detaches the MS after the mobile reachable timer expired or after an irrecoverable radio error causes disconnection of the logical link
After a successful detach:– MM context and PDP context in PAPU are removed;
– P-TMSI - IMSI association is not removed from PAPU;
– The Visiting GPRS subscriber data may be deleted from SMMU;
– otherwise the data from SMMU is removed when "Detached subscriber storage time" timer expires. Also the IMSI-P-TMSI association from PAPU is removed and a "Purge" message is sent to HLR.
GPRS Traffic Management - Mobility Management
For internal use15 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
INACTIVE
ACTIVE
PDP context deactivation(the last) GPRS detach
PDP context activation
PDP context activationPDP context modificationPDP context deactivationTimer expiryResource reallocationPDU
INACTIVE
ACTIVE
PDP context deactivation(the last) GPRS detach
PDP context activation
PDP context activationPDP context modificationPDP context deactivationTimer expiryResource reallocationPDU
GPRS Traffic Management - Session Management
For internal use16 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
GPRS Traffic Management - Session Management
PDP Context Activation
PDP Context Modification
PDP Context Deactivation
For internal use17 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Access Point Name
NOTE: The APN stored in the HLR does not contain the APN Operator Identifier. Also a wild card may be stored in the HLR instead of the APN.
APN Network Id APN Operator Id
my.isp.com. mncxxx.mccyyy.gprs
An Access Point Name is composed of two parts as follows:
The APN Network Identifier
The APN Operator Identifier
The APN Network Identifier is mandatory and is a label (for example "corporation") or a set of labels separated by dots which is a domain name according to the DNS naming conventions
The APN Operator Identifier is optional. It is a domain name according to the DNS naming conventions, and consists of three labels. The APN Operator Identifier shall end with ".gprs".
APN=
For internal use18 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
APN Selection
The SGSN selects the Access Point NameAccess Point Name (APN) to be used for a PDP context based on the MS-requested parameters and the subscribed PDP contexts of the user
The MS can request one of the combinations of the PDP type, PDP address, and APN parameters, which influence the APN selectionAPN selection:
– PDP type, PDP address, APN
– PDP type, PDP address
– PDP type, APN
– PDP type
– None of these parameters
For internal use19 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
GPRS Traffic Management - Charging
Offline Charging: S-CDRs M-CDRs SMS-CDRs
Online Charging: CAP3
For internal use20 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Triggering for CDRs Generation
• Inter PAPU RA Updates are handled like Inter SGSN RA updates in S-CDR point of view• CDR data volume and CDR time limit are configurable parameters
*) If ‘Cell ID in S-CDR’ feature is used
Action Call Data Collection New CDR Subrecord CDR Ready for Transfer
(subscriber/network-generated) Start Stop S-CDR M-CDR S-CDR M-CDR
Attach M
Detach M X
Start of PDP Context S
End of PDP Context S X
Inter SGSN RA Update (old SGSN) M & S X X
Inter SGSN RA Update (new SGSN) M & S
Intra SGSN RA Update (Inter PAPU) S S X X
Cell update (Intra PAPU) X (*
O&M Request M & S X X
Time Tariff Category Switch X
Threshold Volume X
Threshold Time X X
QoS Change X
PAPU restart M & S X X
For internal use21 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
GPRS Traffic Management – Lawful Interception
For internal use22 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – SGSN Interfaces
For internal use23 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – Hardware Architecture
FRONT SIDE
CC4C-A
PAPU14
CC4C-A
PAPU15
CC4C-A
PAPU16
CC4C-A
PAPU8
CC4C-A
PAPU5
CC4C-A
PAPU4
CC4C-A
SMMU3
0 3 6 95
4
3
2
1
0
SGBC
CC4C-A
PAPU13
CC4C-A
PAPU10
CC4C-A
PAPU11
CC4C-A
PAPU12
CC4C-A
PAPU9
CC4C-A
PAPU6
CC4C-A
PAPU7
CC4C-A
SMMU4
CC4C-A
PAPU3
FTRB-A 2 FTRB-A 390 3 6
0 3 6 9
FTRB-A 0 FTRB-A 190 3 6
CL
AC
-BC
LB
U 4
, 5
CL
AC
-BC
LB
U 2
, 3
0 2 8 10
PDFU-BPDFU 0
PDFU-BPDFU 1
CC4C-A
PAPU0
CC4C-A
PAPU1
CC4C-A
PAPU2
CC4C-C
OMU1
CC4C-A
OMU0
CC4C-A
MCHU1
CL
AC
-BC
LB
U 0
,1
0 3 6 9
CC4C-A
SMMU0
1
CC4C-ASMMU
1
0 2 6 9
SD4C-ASD0OMUMCHU
SD4C-ASD 1OMUMCHU
5
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FTRB-A 0 FTRB-A 10 3 6 9
FTRB-A 2 FTRB-A 30 6
0 10
SGAC
0
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7CC4C-A
SMMU2
SW10C-A
GSW2KB1
LA
SW
C-A
LA
NU
0
LA
SW
C-A
LA
NU
1
6 83
CC4C-A
MCHU0
CC4C-A
MCHU0
CPRS-A
CPLC18
CPLAN-A
PDFU-BPDFU 0
PDFU-BPDFU 1
CPETS-E/CPETC-E
CPETS-E/CPETC-E
CPETS-E/CPETC-E
CPEA
CPETS-E/CPETC-E
CPETS-E/CPETC-E
GT4C-AGTIC 0ET16
(ETS2)
GT4C-AGTIC 1ET16
(ETS2)
CPLC18
CL
OC
-BC
LS
USW10C-A
GSW2KB0
SW10C-A
GSW2KB0
CPBP
BASIC CABINET EXTENSION CABINET
SGSN Hardware Units: Packet Processing Unit (PAPU)
process user data and protocol conversion GPRS mobility management (GMM) session management (SM) ciphering and compression between the MS and SGSN Up to 16 + 1 PAPUs
Signalling and Mobility Management Unit (SMMU)
support subscriber mobility management SS7-based interfaces Gr, Gd, Gs, and Gf Up to 4 + 1 SMMU
Operation and Maintenance Unit (OMU) traffic control functions maintenance, system configuration administration, and system management
Marker and Charging Unit (MCHU) collects and stores charging information controls and supervises the group switch (GSW) hunts free circuits establishing and releasing connections
Group Switch (GSW) – Connect to BSS/ NSS Exchange Terminal (ET) – Connect Transmission to GSW Message Bus (MB) – Interconnect Cards
For internal use24 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – Logical Architecture
The main units supporting GPRS are PAPU and SMMU.
The SMMU and PAPU have N+1 redundancy, whereas the MCHU, OMU, MB, GSW and CLS have 2N redundancy
For internal use25 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Signalling and Mobility Management Unit - SMMU (1/2)
SMMU supports subscriber mobility managementsubscriber mobility management functionality. For this it uses several SS7–based interfaces that connect the SGSN to various NSS network elements
SMMU manages a visiting GPRS subscriber database (GSBASE)One SMMU can handle 750.000750.000 subscriberssubscribers simultaneously
-slot 1: PSC6-CB Power Supply
-slot 2: AS7C CCS7 interface unit
-slot 3/4: CP816-AC Central Processing Unit
-slot 5: PSC6 Power Supply
-slot 6: AS7C CCS7 interface unit
-slot 7: CP816-AC Central Processing Unit
1 2 4 5 6 73
DBG
RST
J7
J6
WO
RUN
LF
OL
TE
AP
DRAM
SB
CPSI
SCSI
ETx0
ERx0
CP
U
ETx1
ERx1
AS
7
AP
OP R
ON
OFF
PS
C6-
CB
DBG
RST
J7
J6
WO
RUN
LF
OL
TE
AP
DRAM
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CPSI
SCSI
ETx0
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ERx1
OP R
ON
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C6-
CB
AS
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AP
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SGBC
FTRB-A 2 FTRB-A 3
FTRB-A 0 FTRB-A 1
5
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FTRB-A 2 FTRB-A 3
SGAC
CC4C-A
MCHU0
CL
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LA
NU
0
LA
NU
1
MCHU
1
MCHU
0
FTRB-A 0 FTRB-A 1
CL
BU
OMU
1OMU
0
PAPU
1PAPU
0
SM
MU
0
SM
MU
1
SM
MU
2
SM
MU
3
PAPU
6
PAPU
2
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SM
MU
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SM
MU
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GS
W2K
-1
GS
W2K
-0
PAPU PAPU PAPU3 4 5
ET16 ET16
(ETS2 (ETS2
1
2
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5
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PAPU
7
CL
BU
PAPU PAPU
PAPU PAPU PAPU PAPU
PAPU PAPU PAPU
8 9
10 11 12 13
14 15 16
PDFU 0 PDFU 0PDFU 1 PDFU 1
For internal use26 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
SMMU can handle up to 64 CCS7 linksup to 64 CCS7 links
Support for SS7oIP (SIGTRAN)
N+1 Redundancy
Up to 6 SMMU in SGSN
Signalling and Mobility Management Unit – SMMU (2/2)
1 2 4 5 6 73
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RST
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OP R
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C6-
CB
AS
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AP
For internal use27 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Packet Processing Unit - PAPU (1/4)
• The main purpose of PAPU is to process the user data to/from the RAN and relay it from/to the GPRS backbone network.
• Also handles session and mobility management functions
5
4
3
2
1
0
SGBC
FTRB-A 2 FTRB-A 3
FTRB-A 0 FTRB-A 1
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FTRB-A 2 FTRB-A 3
SGAC
CC4C-A
MCHU0
CL
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LA
NU
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LA
NU
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MCHU
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MCHU
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FTRB-A 0 FTRB-A 1
CL
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OMU
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OMU
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2
0
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PAPU PAPU PAPU
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ET16 ET16
(ETS2 (ETS2
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PAPU
7
CL
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PAPU PAPU
PAPU PAPU PAPU PAPU
PAPU PAPU PAPU
8 9
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14 15 16
PDFU 0 PDFU 0PDFU 1 PDFU 1
For internal use28 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Packet Processing Unit - PAPU (1/4)
1 2 4 5 6 73
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- slot 1: PSC6 Power supply
- slot 2: AS7-C
IOCP -E Central Processing Unit
for I/O Interface Unit
- slot 5: AS7-C Frame Relay Unit
- slot 6: AS7-C Frame Relay Unit
- slot 7: CP816 -A Central Processing Unit
Frame Relay Unit
- slot 3/4:
- slot 1: PSC6 Power Supply - slot 2-4: IOCP-EA Central Processing Unit
for I/O Interface Unit
- slot 5: AS7-C Frame Relay Unit
- slot 6: AS7-C Frame Relay Unit- slot 7: CPU Central Processing Unit
PAPU with IOCP-E PAPU with IOCP-EA
For internal use29 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Packet Processing Unit - PAPU (2/4)
In order to carry the user data between the RAN (Gb or Iu) and the Backbone (Gn), PAPU needs to support a large set of protocols:
Relay
GTP
UDP
IP
Ethernet
SNDCPLLC
BSSGPNS cntl
FRE1Gb/FR (BSS) Gn (GGSN)
PAPU
2G : Gb/FR
Relay
GTP
UDP
IP
Ethernet
SNDCPLLC
BSSGPNS cntl
UDP/IPEthernetGb/IP (BSS)
Gn (GGSN)
PAPU
2G : Gb/IP
Relay
GTP
UDP
IP
Ethernet
SNDCPLLC
BSSGPNS cntl
FRE1Gb/FR (BSS) Gn (GGSN)
PAPU
2G : Gb/FR
Relay
GTP
UDP
IP
Ethernet
SNDCPLLC
BSSGPNS cntl
UDP/IPEthernetGb/IP (BSS)
Gn (GGSN)
PAPU
2G : Gb/IP
Relay
GTP
UDP
IP
Ethernet
Iu user (RAN) Gn (GGSN)
IOCP-E or IOCP-EA
3G: Iu User Plane
GTP
UDP
IPEthernet
Ethernet
PAPU CPU
IPSCTP
M3uA
RANAP
SCCP
Iu control (RAN)
ATM
MTP-3b
ATM relay to IOCP-EA
3G: Iu Control Plane
For internal use30 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Packet Processing Unit - PAPU (3/3)
One AS7-CAS7-C can handle up to 256 tslsup to 256 tsls at 64kbit/s for frame relay frame relay connectionconnection;
IOCP-EIOCP-E contains 4 Ethernet interfaces4 Ethernet interfaces: 2 Ethernet connections for the Gn interfaceGn interface and 2 Ethernet connections for the Iu interface over IPIu interface over IP (optional). IOCP-EAIOCP-EA adds 4x155Mbps Fibre ATM interfaces
CPU816-ACPU816-A also contains 4 Ethernet interfaces4 Ethernet interfaces: 2 Ethernet connections for the Gb interface over IPGb interface over IP and 2 Ethernet connections for EMB EMB interfacesinterfaces
Can manage up to 100 000 subscribers 100 000 subscribers in High Traffic mode or 250.000 250.000 subscribers subscribers in High Attach mode.
A standalone PAPU serves maximum 1000 RA
N+1 Redundancy (IOCP-E) or N+ redundancy (IOCP-EA)
Up to 17 PAPUs in SGSN
For internal use31 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
IOCP-E plug-in unit performs CIPHERING and COMPRESSION
2G CIPHERING
In GPRS, both user data and signalling are ciphered all the way between the MS and the SGSN, not between the MS and the BTS.
2G COMPRESSION
Used between SGSN and MS to minimize the usage of radio and BSS transmission resources, and to speed up the user perceived data throughput.
IOCP-E can perform two kinds of compression:
HEADER COMPRESSION
USER DATA COMPRESSION
EA-variant includes 4x155Mbps ATM interfaces
Central Processing Unit for I/O Interface – IOCP-E/EA
For internal use32 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Interface capacity
• A maximum of 512 bearer channels per PAPU and maximum of 3072 bearer channels per SGSN towards 2G RAN(Gb).
• A maximum of 64 SS7 signalling links per SMMU and maximum of 320 SS7 signalling links (Gr, Gd, Gf and Gs) with 5 SMMU per SGSN, HW supports that number but SW may bring restrictions.
• A maximum of 240 physical E1/T1 PCM lines (Gb and all SS7-based interfaces).
• A maximum of 256 RACs (with or without Multipoint) per SGSN
For internal use33 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Capacity licence management
SGSN element level subscriber, PDP context, and data throughput capacity control are handled with licence management
A valid licence for SGSN level subscriber capacity, PDP context capacity, and data throughput capacity is needed. The following feature codes are in use:
– SGSN Total Attach Capacity
– SGSN Gb Attach Capacity
– SGSN Iu Attach Capacity
– SGSN PDP Context Capacity
– SGSN Data Throughput Capacity
For internal use34 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – O & M
Logging in SGSN
For internal use35 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – O & M
Logging in SGSN
For internal use36 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – O & M
Logging in SGSN
For internal use37 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – O & M
Understanding SGSN CLI
For internal use38 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – O & M
Subscriber Management Commands
Command DescriptionZMMO Check subscriber statusZMMS Check subscriber profile (subscribed APNs)ZMMN Display Number of subscribersZMMD Delete subscriber from SGSN
Command DescriptionZFWO Check GB link statusZEJL Check BVCI statusZW7I Check Licence installed (used for BVCI Count)ZQRI Check IP configurationsZAHO Check system alarmsZQRX Ping/ Traceroute for any interfaceZWVI Check GT/ MNC/ MCC details for own SGSNZWQO BackupZGHI Check Charging Gateway Status
Command DescriptionZOYI Check SCTP association set statusZCFI Check IMSI to GT analysisZNBI Check GT analysisZNAI Check GT Translation resultsZNHI Check Subsystem States
General Health Check and O&M Commands
SS7 Signaling Management Commands
For internal use39 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – O & M
Sample Configurations – Gb Link
For internal use40 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – O & M
Sample Configurations – PLMN Configuration
For internal use41 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – O & M
Sample Configurations – IMSI To GT Table
For internal use42 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – O & M
Sample Configurations – LAC Configuration
For internal use43 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – O & M
Sample Configurations – Signaling Link status
For internal use44 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – O & M
Sample Configurations – Check Unit Load
For internal use45 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – O & M
Sample Configurations – Checking System Clock
For internal use46 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – Analysing Traces
For internal use47 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – Analysing Traces
For internal use48 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – Analysing Traces
For internal use49 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – Analysing Traces
For internal use50 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
NSN SGSN Introduction – O & M
Examples of troubleshooting
Gb Link Trouble shooting Ping Remote IP Take traceroute Get configurations checked at both SGSN and BSC ends Check for any information in alarms PAPU Switchover
GPRS not working Check if subscriber is attached in SGSN Check APNs allowed for subscriber Verify APN subscriber is using for Data Call Take trace on Gn and Gb interfaces
Subscriber not getting attached Check IMSI to GT analysis Check GTT Take trace on Gb and Gr interfaces
Ga, Gn interfaces trouble shooting Ping GGSN/ Charging Gateway IP Take traceroute Take trace on Gn interface
For internal use51 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Hands On Session
For internal use52 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Q & A
For internal use53 © Nokia Siemens Networks SGSN Training Module Vikas Malhotra -26 Mar 2010
Thank you