evolution signaling
TRANSCRIPT
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
The Evolution of SignalingJeff De Ment
Architect, Signaling Protocols
Slide 3www.nmscommunications.com
Contents
Signaling Evolution OverviewSS7 StatusSigtranBearer Independent Call ControlConverged NetworksNMS Signaling Products
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
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), ….
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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…
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
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
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)
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
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
Slide 27www.nmscommunications.com
Upcoming Events
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San Jose, CA, USA — March 18–20Exhibiting: Booth number 1219
http://www.nmscommunications.com/News/Events/Events/SpringVON2008.htm
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