evolution signaling

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NMS Communications at a Glance z Applications & platforms for value-added services z Leader in ringback deployments z Technology expertise spans network to handset z Products deployed in operator networks in 100+ countries z 25 year history of successes and industry “firsts” z 400+ employees; global presence

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Page 1: Evolution Signaling

Slide 1www.nmscommunications.com

NMS Communications at a Glance

Applications & platforms for value-added servicesLeader in ringback deploymentsTechnology expertise spans network to handsetProducts deployed in operator networks in 100+ countries25 year history of successes and industry “firsts”400+ employees; global presence

Page 2: Evolution Signaling

The Evolution of SignalingJeff De Ment

Architect, Signaling Protocols

Page 3: Evolution Signaling

Slide 3www.nmscommunications.com

Contents

Signaling Evolution OverviewSS7 StatusSigtranBearer Independent Call ControlConverged NetworksNMS Signaling Products

Page 4: Evolution Signaling

Slide 4www.nmscommunications.com

Signaling Evolution Overview

1990 2000 2007

Bearer Independent Call ControlBICC

Sigtran: SS7/IP

Call Control

Network Services:800, Calling Name, LNP

Wireless: Mobility, Roaming, SMS

IN: Prepaid, Call Mgmt, Ringback

High Speed Links

SS7

Converged NetworksIP Core IMS Multi-Access

SIP H.248 Diameter

Page 5: Evolution Signaling

Slide 5www.nmscommunications.com

Signaling Evolution Drivers

Signaling bandwidth requirements for new servicesSMS, MMSNumber portabilityPush-to-talk, voice call continuityPresence, location

Transport evolution from TDM to packetIP/Ethernet everywhereLower cost, higher bandwidth

Protocol explosion in standards bodiesIETF: SIP, SIP-T, SIMPLE, SIGTRAN3GPP: R99 (UMTS) , R4 (IP-core), R5, R6, R7 (IMS), ….

Page 6: Evolution Signaling

Slide 6www.nmscommunications.com

Signaling Evolution Stages

Starts in core networkHighly utilized routes replaced for bandwidth/cost reductionSmall number of nodes updated/replacedSigtran or BICC deployed here first

Evolves to access networksFor new services and/or bandwidthInterworking with new networksMore equipment impacted: switches, gateways, DSLAMs

Migrates to edge devices lastNew service deploymentsEnhanced service platforms, application servers, media servers

Page 7: Evolution Signaling

Slide 7www.nmscommunications.com

Overview of SS7

Circuit-switched call control: ISUP, TUPNon-circuit services: TCAP, SCCP

IN-service protocols: INAP, AIN, CAMELWireless services: MAP — mobility, HLR, roaming, SMSNetwork-based services: 800, calling name, LNP

Signaling Transport: MTP layers 1-3Optimized for 48/56/64 kbps linksHigh-speed links (full T1/E1) introduced for high-bandwidth paths

Widely deployed in nearly all networksWireline and wireless

New service deployments still occurring

Page 8: Evolution Signaling

Slide 8www.nmscommunications.com

SS7 Protocol Architecture

MTP Layer 1

MTP Layer 2

MTP Layer 3

SCCP

IS-634/BSSAP

TCAP

MSC

ANSI-41

HLR

GSMMAP

INAP/CAMEL ISUP/

TUP

BSS ServiceNode

Transport layers

Upper layers

Page 9: Evolution Signaling

Slide 9www.nmscommunications.com

Sigtran — What is it?

Transport of upper layers of SS7 in IP packetsReplaces the transport layers of SS7 (MTP, SCCP)Sigtran Architecture Components

SCTP — Stream Control Transmission ProtocolReliable transport for signaling

Adaptation Layers — many different ones availableResides on both SG and IP Node

Inter-working function on SGMapping between IP addresses and SS7 point codesMultiplexing SS7 interface to multiple IP Nodes

ISUP, TCAP reside on IP Node(Optional) IPSEC on IP node and SG

Page 10: Evolution Signaling

Slide 10www.nmscommunications.com

Sigtran Protocol Architecture

IP/Ethernet

SCTP

M3UA

SCCP

TCAP

MSC

ANSI-41

HLR

GSMMAP

INAP/CAMEL

ISUP,BICC,TUP

ServiceNode

Transport layers

Upper layers

Adaptation layersSUA

Page 11: Evolution Signaling

Slide 11www.nmscommunications.com

SCTP Protocol Characteristics

Reliable transport layerConnection oriented

Multiple control “streams” per portIn-sequence delivery within a “stream”

Supports multi-homing with fail-overTCP-like congestion avoidanceAddresses some of TCP’s limitations

High fan-out (large number of connections)Fast detection of failures

Page 12: Evolution Signaling

Slide 12www.nmscommunications.com

Sigtran Adaptation Layers

One for each different signaling protocolMTP-2 adaptation layers (M2UA/M2PA)MTP-3 adaptation layer (M3UA)SCCP adaptation layer (SUA)

Provides status and network management services in addition to data transferUpper adaptation layers support various redundancy models

Primary/backupLoad sharing

Page 13: Evolution Signaling

Slide 13www.nmscommunications.com

Packet NetworkPSTN/SS7

PC=10-1-30IP=1.2.3.10STPSTP

SSP

SSP

STPSTP

IP/ETHSCTPM3UA

ISUP TCAP/SCCP

Application

TDMMTP2

IP/ETHSCTP

MTP3 M3UAIWF

SGSG

PC=10-1-255

PC=10-1-10

PC=10-1-20

PC=10-1-1

IP=1.2.3.3

IP=1.2.3.2

IP=1.2.3.1

MGC

MGC

MGC

Signaling Gateway Architecture

Page 14: Evolution Signaling

Slide 14www.nmscommunications.com

Packet NetworkSSP

IP/ETHSCTPM3UA

ISUP TCAP/SCCP

APPLICATION

PC=10-1-20

IP=1.2.3.3

IP=1.2.3.2

IP=1.2.3.1MGC

MGC

MGC

IPSP – IPSP Model

IP/ETHSCTPM3UA

ISUP TCAP/SCCP

APPLICATION

PC=10-1-10

PC=10-1-11

PC=10-1-12

IP=1.2.3.20

Page 15: Evolution Signaling

Slide 15www.nmscommunications.com

Public Deployments

AT&T (Cingular)Used M2PA for STP-to-STP hauling of SS7 linksFuture plans included:

M3UA for MSCs, SMSCs and SCPs

Vodafone IrelandSMSCs

KPN/NetherlandsTo prepare for IMS infrastructure

China MobileSMS traffic again the driver

Just a few examples

Page 16: Evolution Signaling

Slide 16www.nmscommunications.com

BICC Overview

Bearer Independent Call ControlExtension to SS7 ISUP for setting up calls over packet bearer networksCan be transported over

SS7 MTP3 or MTP3-b (ATM)Sigtran M3UA/SCTP

Actual bearer setup protocol can be transported independently or tunneled over BICC itself

For RTP/IP bearer networks, SDP can be tunneled over BICC to set up RTP connection

Competes with SIP-T for core network call control

Page 17: Evolution Signaling

Slide 17www.nmscommunications.com

BICC Capability Sets

Capability set 1 (Q.1901)Basic call control, ATM-orientationForward or Backward Bearer SetupCodec negotiation + mid-call codec modificationTear-down bearer at end of call or keep for re-use on another call

Capability set 2 (Q.1902.x)IP bearer set-up supportBearer protocol tunnelingSupplementary servicesExtension to special resource nodes, via H.248

Page 18: Evolution Signaling

Slide 18www.nmscommunications.com

BICC Call Flow ModelPSTN-TMCG/MGMGC/MGPSTN-O ISUP

Bearer Established

ISUPBICC

IAMIAM (connect fwd)

IAM

ACM

APM (connect fwd)

APM (connected)

[optional]

ACMACM

ANMANM

ANM

Note: Many other flows possible

Bearer Setup

Bearer Connect

Page 19: Evolution Signaling

Slide 19www.nmscommunications.com

BICC Call with tunneled SDP bearer setup (forward bearer setup)

Bearer Established

IAM (connect fwd)

(tunneled SDP Offer)

APM (connect fwd)

(tunneled SDP Answer)

APM (connected)

[optional]

PSTN-TMCG/MGMGC/MGPSTN-O ISUP ISUPBICC

IAM

IAM

ACMACM

ACM

ANMANM

ANM

Page 20: Evolution Signaling

Gb/IuPS

A/IuCS

SS7

IP/ATM

BTS

BSC MSC ServerVLR

HSS AuC

GMSC server

BSS

SGSN GGSN

CN

CD

GcGr

Gn Gi

Abis

Gs

B

H

BICC in 3GPP rel5 Architecture: MSC-Server to MSC-Server Interface (Nc )

2G MS (voice only)

2G+ MS (voice & data)

Node B

RNC

RNS

Iub

3G UE (voice & data)

CS-MGW

CS-MGWNb

PSTN

IuCS

IuPS

IP/ATM

IM

IPPSTN

MGCF

IM-MGW

MRF

CSCF

Mg

Gs

PSTN

Mc Mc

Mc

PSTN

IP Network

Page 21: Evolution Signaling

Slide 21www.nmscommunications.com

Converged Networks

Packet-switched IP core network (e.g., IMS)Voice, video, dataCommon user profile (HSS)

SIP is the dominant signaling protocolCommon services independent of:

Access networkLocationDevice

Interworking with multiple access networksCircuit switched and packet switchedWireless, broadband, 2G, 3G, ….

Proliferation of protocols can be challenging…

Page 22: Evolution Signaling

Slide 22www.nmscommunications.com

Example: 3GPP MSC Server Stacks

MTP

ISUP

L1ATM

CPS AAL5SSCOP

SSCF-NNIMTP3bSCCPTCAPMAP

L1ATM

CPS AAL5SSCOP

SSCF-NNIMTP3b

H.248

L1ATM

CPS AAL5SSCOP

SSCF-NNIMTP3b

PSTN

C

HLR

Cl.5/4

Mc

Nc

L1ATM

CPS AAL5SSCOP

SSCF-NNIMTP3b

RANAP

MMCC/SS/SMS

To User Equipment

IuCSIuCS

SAAL-NNI

Q.2150.1

AA

To Mobile StationL1

MTP2MTP3SCCP

BSSAP+

GsGs

MTP

SCCPBSSAP

MMCM

L1L2

IP v6/v4

SCTP

M3UA

L1L2

IP v6/v4

SCTP

M3UA

L1L2

IP v6/v4

SCTPM3UASCCP

BICC

BSSAP BSS Application Part — GSM 08.08 / 08.06

ISUP ISDN User Part — ITU Q.76x

M3UA MTP3 User Adaptation — RFC 4666

MAP Mobile Application Part — GSM 09.02

MTP Message Transfer Part (1,2,3) — ITU Q.70x

MTP3b Message Transfer Part over ATM — ITU Q.2210

RANAP RAN Application Part — TS 25.413

SAAL Signaling AAL — ITU Q.2100

CC/SS/SMS Call Control, Supp Serv, Short Message Service)

MM Mobility Management

SCCP Service Connection Control Part — ITU Q.71x

SCTP Stream Control Transport Protocol — RFC 2960

SSCF-NNI Service Specific Coord. Function — ITU Q.2140

SSCOP Service Specific Connection Oriented Protocol — ITU Q.2110

TCAP Transaction Capabilities Application Part — ITU Q.77x

Page 23: Evolution Signaling

Slide 23www.nmscommunications.com

NMS Network Signaling Support

Natural Access

ISDN/CAS

TX 4000TX 4000CTX 4000e

SIP SS7 ISUP BICC TCAP

SigtranM3UA

MTPTDM

VisionSignaling

Server

Page 24: Evolution Signaling

Slide 24www.nmscommunications.com

SS7 Signaling Boards — TX Series

Powerful and flexible solutions for global SS7 applicationsSupport for a full 32 SS7 links and up to 4 high-speed links (HSL)Software-selectable T1 or E1 (120 ohm) trunksFull node-level redundancy for high availabilityOn-board software, freeing host computer Protocols meet telephony standards, compatible with all major switchesVariety of form factors and density: PCI, cPCI, PCIe (2008)

Page 25: Evolution Signaling

Slide 25www.nmscommunications.com

Vision Signaling Server

Provides ISUP signaling over SS7 for the Vision Media Gateway

4, 16, or 32 low-speed signaling links (DS0s)4 high-speed links (HSL) (DS1s)

Carrier-gradeNEBS-compliantRedundant, fault tolerant configurations AC or DC powered

Supports up to 20 clients

Page 26: Evolution Signaling

Slide 26www.nmscommunications.com

Summary

Signaling network evolution towards converged, SIP-based networks is underway

Transition will take many yearsOperators must leverage existing installed base of SS7 services and equipment

For the next several years, transition technologies are needed to bridge the gap between today’s service architectures and converged networksNMS signaling products can help smooth the transition

Page 27: Evolution Signaling

Slide 27www.nmscommunications.com

Upcoming Events

TradeshowsSpring VON

San Jose, CA, USA — March 18–20Exhibiting: Booth number 1219

http://www.nmscommunications.com/News/Events/Events/SpringVON2008.htm

WebinarsA Close Look at Service Creation Tools for Accelerating Application Development

January 3111:00am EST Registration coming soon!

Page 28: Evolution Signaling

N M S COMMUNICATIONS