Exchange 2000 Migration Workshop Detailed Design - Cleanup Existing Exchange System (P2K-0695)
NEXT GENERATION NETWORKS A view on migration paths from existing
Transcript of NEXT GENERATION NETWORKS A view on migration paths from existing
NEXT GENERATION NETWORKSA view on migration paths from existing fixed and mobile networks
Souheil MARINEJean-Marie BLANCHARD
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 2
Why Next Generation Networks ?
> Convergence between the packet-based Internet and telephony networks
• Driven by technological evolution• Demand for a universal service network
> Take the best from each• Service provision of the telephony network model• Openness and flexibility of the Internet model
> Possible Definition of a Next Generation Network• A packet transport based network where the transport, control and
service layers are separated from each other and interact through open interfaces
> The target is well defined but how to get there ?
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 3
Migration Rationale
> Migration of current telephony networks (2 billion users worldwide) should preserve the existing investments
> Key investments in any network are in provisioning access for end-users to the network services (80% of the costs)
• Any technological changes become costlier when they get closer to end-users and should be justified by added value brought with them
> Migration must be driven by basic principles• Continuity of services offered to end-users• Inter-working between new and old technologies• Cost control of the migration process
> Migration should above all be driven by economic considerations• Network consolidation and optimization and/or• New revenues driven from new services
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 4
Proposed Migration Approach
> Approach in 5 steps where each is justified by new services or advantages brought from consolidation
> Application of each step to the specific case of fixed and mobile (GSM and future 3G UMTS) networks
> The proposed migration steps are generic• Application of each step depends on the specific operator context• All are not compulsory and do not follow in the same sequence• There is no “one size fits all” migration scenario
> Network views of migration steps are not exhaustive• Emphasis put on significant network elements needed for service
provision, on signaling relations between end-users and the network and between network entities
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 5
Step 1 Fixed: Access to the Internet and Converged Internet/Telephony services
POTS, ISDN
Local
VoiceDataSignaling
Internet
PacketNetwork
Dial-upModem
DSLAM
BAS
DSL Modem
‘PINT’, ‘SPIRITS’
Parlay, JAIN, SIP
ApplicationServers
WWWServers
SS7
Local
Transit
TDM
STP
INAP
ISUP
Access Node
SCP
ISUP
Transit
NAS
ISDN/PRA
ApGW
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 6
Step 1 Fixed: Access to the Internet and Converged Internet/Telephony services
> Basic telephony service and its associated supplementary services
• TDM based transport• SS7 based signaling
> Intelligent Network Services• Calling Cards, Free phone,Voice virtual private networks,…
> Internet access• In dial-up mode or in broadband mode with DSL technology
> Converged Voice/data services• Benefit from the simultaneous availability of a telephony access and
Internet access in the case of broadband Internet access• Examples of converged services: Click-to-Dial, Internet Call Waiting,
Web Augmented Calling, Unified Messaging,...
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 7
Step 1 Mobile: Introduction of GPRS Packet Services
GPRSBox
Mobile Radio
AbisBTS
BTS
BTSAter
BSC
Mobile Core Circuit SwitchingMSC/VLR
HLR
PSTN
GsA
Mobile Core Packet Switching
Gb Internet / Intranet
DNS / DHCP
Charging Gateway WAP
Gateway
Gn Gi
IP backbone
GGSN
SGSN
Border Gateway
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 8
Step 1 Mobile: Introduction of GPRS Packet Services
> General Packet Radio Service (GPRS) introduced as a solution for offering an always-on access mode to data services for mobiles
• Optimized use of the scarce radio resource– Share the bandwidth for data services between users of a given radio
coverage zone (cell)– Radio resources are not monopolized during idle periods
> No modification of the existing radio and core infrastructure for voice services
• GPRS adaptation equipment added to existing radio infrastructure• GPRS specific core infrastructure re-usable in further evolution
steps
> GPRS service platform • Offers access to Internet/Intranet data networks and to service
portals (first step towards future UMTS services)• Optimize provision of 2G data services like Short Messages (SMS)
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 9
Step2 Fixed: Network consolidation and introduction of new multi-service access nodes
Internet
PacketNetwork
POTS, ISDN
SS7
ADSL-NT
Transit
Local
SCP
Voice
STP
DSLAM
Local
INAP
V5.2
Access Node
TDM
VoiceDataSignaling
ISUP
ISUP
Multi-service AccessNodes
V5.2V5.2 or
proprietary
ATM, IP
NAS
BAS
ISUP (IMT)
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 10
Step 2 Fixed: Network consolidation and introduction of new multi-service access nodes> Switch consolidation
• Maximize number of line, minimize number of nodes• Upgrade of switch fabric and processors for higher capacity and
speed
> Access Consolidation• Add NGN-ready multi-service access nodes
– End-user in native packet access mode– DSL but also other alternative next generation local loop technologies
(cable networks, wireless local loop, satellite,…)– Introduce Voice-over-DSL (loop emulation service) and extend voice
service offer without modification of the legacy switches
> Optimize interconnection to the data network for dial-up access• Interconnection at local exchanges level (offload transit level)• Use of ISUP and Inter Machine Trunks (IMT) instead of ISDN/PRA
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 11
Step 2 Mobile: Introduction of UMTS Radio Access Networks
QoS-enabled IP backbone
Optical Core
UMTSRAN
Internet
HLR
PSTNSGSN
GGSN
GSMRAN
MSC
SCP
EdgeRouter
EdgeRouter
CoreRouter
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 12
Step 2 Mobile: Introduction of UMTS Radio Access Networks> Initial introduction of 3G UMTS radio access network (UTRAN)
as coverage islands• Rest of the network coverage kept with legacy GSM 2G/2.5G radio
> Combined 2G/3G HLR, MSC, SGSN and GGSN network equipment support both types of access (Alcatel’s approach)
• Smooth upgrade of early 2G equipment
> Backbone data network introduced with QoS features• Edge router concentrates ATM streams coming from UTRAN
– Front-end for both packet and circuit streams– Evolves into an access gateway in future evolution steps
• Core router switches IP traffic with MPLS/DiffServ support
> New service capabilities with location based service support • Enhanced intelligent network interfaces for mobiles towards SCP
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 13
Step 3 Fixed: Voice over Packet for Trunking
Packet Network
SS7
Local or Transit
SCP
STP
Local or Transit
TDM
INAP
BICC
VoiceDataVoice/PacketSignaling
Internet
Integrated Gateway
ISUPTransit
ISUP
INAP
H.248
ISUP, BICC, SIP-T
Switch with MGC function or Softswitch
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 14
Step 3 Fixed: Voice over Packet for Trunking
> Gradually offload voice trunking traffic to the packet network> Network consolidation by removal of an upper transit level or
optimization within a transit level • Voice-over-Packet trunking through integrated gateways in the
LEX/TEX• Alternative solution based on external trunking gateways controlled
by a Switch with Media Gateway Control (MGC) function or a Softswitch
• Use of SS7 based BICC signaling for co-existence with PSTN/ISDN services
• Reuse of existing IN services for business continuity
> First mastering of voice over packet technology at aggregate level• Simpler Quality of Service issues
> Service transparency of Voice over Packet use for end-users
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 15
Step 3 Mobile: Voice service over Packets (Core and Access)
QoS-enabled IP backbone
Optical Core
UMTSRAN
Internet
HLR
PSTN
SGSN
GSMRAN
MSCserver
SCP
A-MGW
T-MGW
GMSCserver
BICC
H.248 H.248
AMR/AAL2Conne
ctivit
yLay
er
Contro
lLay
er
GGSNEdge
RouterEdge
Router
Core Router
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 16
Step 3 Mobile: Voice service over Packets (Core and Access) > Generalization of UTRAN access
• Voice coming in packet mode (ATM/AAL2) from the access network
> Leverage on the QoS-enabled IP backbone to support voice services in NGN way
• Keep voice in original packet mode for mobile-mobile calls– Avoid unnecessary and quality decreasing encoding/decoding
• Evolution of 2G/3G integrated MSCs into MSC servers (Alcatel’sapproach)
• Use of the H.248 open interface to control Media gateways
> Media gateways for Access and Trunking functionality • Based on the same platform as the Edge Router• Mediation device for voice applications over ATM/AAL2
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 17
Step 4 Fixed: Voice over packet up to access level
Packet Network
SS7
Local
SCP
STP
ANAccess Node
TDM
CentralizedAccess Gateway
DSLAM
H.248
INAPInternet
Switch with MGC function or Softswitch
ISUP
VoiceData
Voice/ PacketSignaling
Transit
ISUP
Multi-service Access Node
with Integrated Access Gateway
Voice/Packet Gateway
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 18
Step 4 Fixed: Voice over packet up to access level
> Extend use of packet transport to the access network for voice services
• Introduction of Access Gateways– Integrated within next generation multi-service access nodes or– Standalone centralized access gateways
• Access gateways are controlled by a switch with MGC function or a softswitch
– Same services portfolio as on the PSTN/ISDN– Tighter integration of voice and packet services
> Improved network consolidation• control of the voice traffic from fewer MGC Switches or
Softswitches• Voice traffic gradually moved from the control of old generation
switching equipment to the control of upgraded MGC switches or Softswitches
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 19
Step 5 Fixed: Multimedia Services
Internet
WWWServers
Packet Network
SS7
Local
SCP
STP
AN
Transit
TDM
Softswitch
DSLAM
BAS
ApplicationServers
Portal
SIPParlay JAIN
SIP
SIP, H.323
HTTP
VoiceData
Voice/PacketSignaling
INAP
ISUPISUP
ISUP
H.248
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 20
Step 5 Fixed: Multimedia Services
> End-users connected through next generation multi-service access nodes will adopt IP terminals for multimedia services
• Better benefit of the high bandwidth, always-on and interactivity associated with such next generation access networks
> New IP terminals will be controlled by Multimedia Softswitchesthrough a new type of NGN signaling
• SIP or H.323• Access network will focus on resource provision under the
softswitch control depending on the service used
> A multimedia softswitch offers network services but also third party services through portals and open interface
• Network operator becomes the intermediary broker between application providers and their clients
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 21
Step 5 Mobile: Multimedia Services
QoS-enabled IP backbone
Optical Core
UMTSRAN
Internet
PSTN
SIP Terminals
Transport & connectivity layer
Session layer
Service Co-ordination layer
Application layer
Portal
3rd party Application
Inte
grat
edM
anag
emen
t
HLR
3rd party Application3rd party
Application
GGSN
HSS
Mediaserver
A-MGW
V/G-MSC Server
SGSN
T-MGW
Multimedia Softswitch
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 22
Step 5 Mobile: Multimedia Services> IMS is the operator solution to differentiate from commodity-
priced best-effort data services• Offering end-to-end Quality of service• Network operator as the broker of added-value services
– Services can be offered by 3rd party service providers• New business model unlocking new revenue sources
> Multimedia Softswitch providing new services• Re-use of the currently deployed packet switched IP backbone
and network equipment (SGSN and GGSN)• New NGN signaling with new type of end-user terminals
– SIP protocol with proper extensions to ensure end-to-end QoS per service invocation
• Open interfaces towards 3rd party service provider • Inter-working with voice services through interface with MSC
Server
All rights reserved © 2002, AlcatelSéminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002— 23
Conclusions
> Migration to NGN is an evolution of existing networks> Driven by
• Enhanced capabilities of Broadband access• Demand for new services from customers
> Speed of migration depends on • Widespread acceptance and appropriation of new services• But also on the maturity of the newly introduced technologies
> There is no universal migration scenario• Each migration depends on specific operator conditions, strategy,
and…available budget• Migration process must be self-financed by revenue from new
services and/or cost reductions from network optimization• Interoperability with the installed base is a key condition for
success
www.alcatel.comThank You !Questions ?