07 SS7 Interfaces Configuring CN3122EN70GLN00 Ppt

For public use IPR applies1 Nokia Siemens Networks SS7 in SGSN / TAd/ 5.10.2008

SGSN Release 7 OMSS7 in SGSN

2 Nokia Siemens Networks SS7 in SGSN / TAd/ 5.10.2008For public use IPR applies

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Document change history

Initial DraftTanti Adriyani0.115.10.2008

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Objectives

After this training session, the student can: Locate the SS7-based interfaces in the SGSN Describe the SS7 protocol stack used by the SGSN Describe features and parameters related to SS7 interfaces

with reference to the training documentation


SS7 Interfaces

NodeB

SGSNSGSN

RNCRNC 3GHLRHLREIR

BTSBTS

3GMSCIW-MSC

SCPSCP

SMSC

3GMSCMSC

RNCBSC

Gr/Gf Ge

GdGs

Iu-PS


SS7 basics

Configuring SS7 Interfaces


SS7 stack of protocols

MTP

L1L2IP

SCTPM3UA

SCCPTCAP

MAP

B

S

S

A

P

+

R

A

N

A

PCAP

Gs

Gd, Gr, Gf Ge

Iu-PS


CSS7 Message Structure (MSU)

OPC DPCSLSCIC

SIF

Subservice Field,Netw. Indicator

ServiceIndicatorD A T A

SIO

Subservice Field,Netw. IndicatorAddress Info

LI FIB FSN BIB BSN FCKF

L2L2L3

Upper LayersL1 = MTP Layer 1L2 = MTP Layer 2L3 = MTP Layer 3

First bit to send

Address Information

User/Application

Part

MTP


SS7 link concepts

Node A Node B

SPC SPC

Node A Node B

SPC SPC

SS7 signalling link

SS7 signalling link setNode A Node B

Node C

SignallingRoutes

Signalling Route Set

SPC SPC

STP

SS7 signalling route set and routes


SCCP routing by label and by GT

CAP MAP RANAP

Is DPC contained in the message?

Yes No (there is a GT)

Routing on label(do nothing)

Routing on GT(GT analysis)

Message handling

Application parts

SCCP

MTP


Signalling routing (MTP and SCCP)

CAP MAP RANAP

RI = GT

Application parts

SCCP

MTP

SIO = SCCP

GT Analysis

Other DPC

Discrimination

DPC = own SPCRouting

Distribution

RIRI = SSN

DPCOwn SPC

SSN

DPC = other SPC


GT examples

Global Title Format: Numbering Plan Digits

E.164 358 60 2210

E.164 86 138 00100500

HLR address

SMSC address


Hybrid numbers for different operators

Operator CC+NDC Operatornumber

MSIN(part of E.212)

Hybrid number (E.214):operator number +MSIN

Finnish 35850 35850 1234567890 35850+1234567890

China A 86139 86139 0000000002 86139+0000000002

China B 86130 86130 0000001234 86130+0000001234


Global title analysis

GTAnalysis

Numbering Plan

Digits

DPC

RI

When the DPC receives the message RI = SSN, there is no need for GT analysis. RI = GT, the GT analysis has to be performed.


IMSI analysis with output as Hybrid number (E.214)

IMSIAnalysisIMSI or E.212 Hybrid no. or E.214

MCC MNC MSIN Operator No. MSIN


IMSI analysis with routing on GT

IMSIAnalysis

IMSI or E.212

Hybrid no. or E.214

GTAnalysis

Message handling

SCCP routing on GT

MTP


IMSI analysis with output as DPC of the HLR

IMSIAnalysisIMSI or E.212 DPC of the HLR

MCC MNC MSIN


IMSI analysis with routing on label

IMSIAnalysis

IMSI or E.212

DPC of the HLR

Message handling

SCCP routing on label

MTP


SCCP routing at the SGSN (both on label and GT)

MTP3

SCCP

APPL.

GTT GTT

MTP3Routing

MTP3Routing

MTP3Routing

MTP3Routing

MTP3Routing


SCCP subsystems


SCCP subsystems used in Nokia SGSN

HLR

MAPE

H'09

MAPH

H'06

MSC BSSAP+H'C0

BSSAP+

H'C0

SGSN

MAPS H95 149 (Dec)

CAP H92 166 (Dec)

MAP-M H8 8 (Dec)

MAP-V H7 7 (Dec)

RANAP

RNC

RANAPH8E

142 (Dec.)H8E

142 (Dec.)


SS7-based interfaces



Gf

Ge

Uu

Um

D

Gi

Gn

Iu Gc

CE

Gp

Gs

Signalling and Data Transfer Interface Signalling Interface

MSC/VLR

TE MT UTRAN PDN

GrIu

HLR

Other PLMN

SGSN

GGSN

Gd

SM-SCSMS-GMSC

SMS-IWMSC

GGSN

EIRSGSN

Gn CG

GaGa

Billing System

Gb TE MT BSS

R

A R

CAMEL GSM-SCF

Gr Interface (SGSN-HLR) 1/2

The Gr provides the SGSN with an access to the GPRS subscription information in the HLR.


Gr Interface (SGSN-HLR) 2/2

The Gr interface requires the MAP version 3, that is, the MAP protocol with GPRS additions. The following operations are supported:

UpdateGPRSLocation SGSN /SMMU=> HLR InsertSubscriberData HLR => SGSN/SMMU DeleteSubscriberData HLR => SGSN/SMMU PurgeMS SGSN /SMMU=> HLR CancelLocation HLR => SGSN/SMMU ReadyForSM SGSN /SMMU=> HLR SendAuthenticationInfo SGSN /SMMU=> HLR Reset HLR => SGSN/SMMU


Gf

Ge

Uu

Um

D

Gi

Gn

Iu Gc

C E

Gp

Gs


MSC/VLR

TE MT UTRAN PDN

GrIu

HLR

Other PLMN

SGSN

GGSN

Gd

SM-SC SMS-GMSC

SMS-IWMSC

GGSN

EIRSGSN

Gn CG

GaGa

BillingSystem

Gb TE MT BSS

R

A R

CAMEL GSM-SCF

Gf Interface (SGSN-EIR)

The Gf interface connects SGSNs (SMMU) to the EIR in order to support terminal authentication. No GPRS-specific signalling information needs to be supported. The supported operations are:

CheckIMEI SGSN/SMMU => EIR


Gf

Ge

Uu

Um

D

Gi

Gn

Iu Gc

CE

Gp

Gs


MSC/VLR

TE MT UTRAN PDN

GrIu

HLR

Other PLMN

SGSN

GGSN

Gd

SM-SCSMS-GMSC

SMS-IWMSC

GGSN

EIRSGSN

Gn CG

GaGa

Billing System

Gb TE MT BSS

R

A R

CAMEL GSM-SCF

Gd Interface (SGSN- GMSC/IWMSC)

The Gd interface connects the SGSN to the Gateway MSC in order to support SMS delivery via GPRS. As with Gf, no GPRS-specific signalling information needs to be supported.


Gf

Ge

Uu

Um

D

Gi

Gn

Iu Gc

CE

Gp

Gs


MSC/VLR

TE MT UTRAN PDN

GrIu

HLR

Other PLMN

SGSN

GGSN

Gd

SM-SCSMS-GMSC

SMS-IWMSC

GGSN

EIRSGSN

Gn CG

GaGa

Billing System

Gb TE MT BSS

R

A R

CAMEL GSM-SCF

Gs Interface (SGSN-MSC/VLR) 1/2

The Gs interface links the SGSN's visiting subscriber database to the VLR in an MSC.


Gs Interface (SGSN-MSC/VLR) 2/2

The supported procedures are: CS paging IMSI attach for a GPRS attached MS GPRS attach for an IMSI attached MS IMSI detach GPRS detach Combined RA/LA update Non-GPRS alert MS information enquiry MM information Reset (MSC/VLR SGSN).


Gf

Ge

Uu

Um

D

Gi

Gn

Iu Gc

C E

Gp

Gs


MSC/VLR

TE MT UTRAN PDN

GrIu

HLR

Other PLMN

SGSN

GGSN

Gd

SM-SCSMS-GMSC

SMS-IWMSC

GGSN

EIRSGSN

Gn CG

GaGa

Billing System

Gb TE MT BSS

R

A R

CAMEL GSM-SCF

Ge Interface (SGSN SCP)

Nokia 2G SGSN provides an interface to the Intelligent Network Service Control Point (IN SCP) for supporting Customised Applications for Mobile Network Enhanced Logic (CAMEL).


SS7 over IP



SGSN provides an alternative to move SS7 signalling from TDM to IP using SCTP transport protocol layer and M3UA user adaptation layer based on IETF signalling transport work group SIGTRAN.

Load of signalling links in conventional SS7 signalling network can be decreased by connecting part of signalling traffic via IP network.

SS7 signalling network is used in the interfaces Iu-PS, Gd, Ge, Gf, Gs and Gr

SS7 over IP

L1L2IP

SCTPM3UA

SCCPTCAP

MAP

B

S

S

A

P

+

R

A

N

A

PCAP


Association sets and associations

A Signaling Link Set can only contain one IP link setIP link set"

An IP link setIP link set" consists of one SCTP association set

SMMU 0

SMMU 1

SMMU 2

SMMU 3

SGSN(client)

CCSU 0

CCSU 1

CCSU 2

CCSU 3

HLR(server)SCTP association association set

(up to 16 associations)

IPIPnetworknetwork

eth

eth

eth

eth

eth

eth

eth

eth

SPC_1 SPC_2


SS7oIP: Basic Structures

Using an IP Signalling Gateway

Point-to-Point IP connection IPIP

HLR SGSN

STP

STP

SGW

SGW

IP

HLR

STPSTP

STPSTP

SGWSGW

SGWSGW

IPIP

SGSN

07 SS7 Interfaces Configuring CN3122EN70GLN00 Ppt

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