NGN framework Part II Corporate Planning & Monitoring Cell, BSNL
What options? What strategy? Rs. Today Strategy Time 2
An NGN framework architecture alone can support enablement of newer services Rs. Today Time 3
Requirements of an NGN framework architecture Resilient network Never stop routing Never stop forwarding Never interrupt services for upgrades Dynamic network Dynamically move resources to where they are most profitably deployed Real time and policy driven allocation Centralized policy engine The New Network Secure network Protection at services and network layer Policy driven and dynamic Open network Interfaces based on common standards Open APIs Scalable network Traffic: Scalable transport & control plane Subscribers/end points: Scalable subscriber density with QoE Services: enabling multi-service, multi-access and device agnostic QoE Efficient network Reduce watts per bit Reduce carbon footprint Better facility utilization 4
NGN framework high level network node architecture CUSTOMER ENVIRONMENT Home Network Head Office Branch Office Data Centre Mobile Network LAN ~millions of NG-CE locations NTE LAN CG WiFi/Ethernet GE/G.703 CG NTE WiFi/Ethernet GE/G.703 LAN CG GE/FCP ISCSI/ESCON LAN Bluetooth/ WiFi/Ethernet CG NTE NTE APPLICATIONS (MOBILE TAS, SMSC, IN) CONTROL CORE (MSC, CSCF, HSS, XDMS, AAA, HLR) ACCESS NETWORK E1 Eth ADSL GPON PDH SDH GE ADSL SDSL PDH SDH GE Fibre Cu Fibre Cu & Fibre Fibre ~30K-45K NG-AN locations AGGREGATION & CENTRAL OFFICE (MULTI-PLAY) Converged L2 MPLS/RPR CET (Carrier Ethernet + Transport) Aggregation Network ~300K-450K NG-CO locations IN PE Edge Services 4x (1+1) NG-DC locations Data Centre TRANSPORT CORE (NIB-II MPLS) Packet Switched Core (Optical/OEO DWDM & MPLS VPN) ~30-45 Transport (NG-CN) 5
FACILITIES CONSOLIDATION Zonal Centers, Data Centers POI s, Level 1&2 TAX s Tandem TAX s 4 Data Centers at Zonal level 30 to 45 NG-CN NG-DC NG- CN CO s 300 to 450 NG-CO NG-CO Last 5 kms Last km Phone PC Terminal 30K to 45K NG-AN Convergent Backhaul Points for Fixed & Mobile Phone PC Terminal Last 20 kms NG-AN Last km NG-CE Economies of scale and service enablement through Central Office consolidation 6
Fixed Access network - today IP/MPLS Exchange Power Plant Exchange -48V power Copper line < 3 km Plain Old Telephone Multi Play G E I T G H A E B R I N T E T DSLAM Splitter ADSL 2+ PC 230V Mains 7
Converged Access network - tomorrow Local Exchange becomes an NG-Access Node IMS (Soft Switch) IP Network G I G A B I T Exchange Power Plant Analog to IP Adaptor Exchange Line Unit -48V power Copper line < 1.6 km Intelligent Plain Old Telephone NG-CO Layer-2 Switch Content Security E T H E R N E T DSLAM BTS, Node B Wireless Splitter Handset Universal Customer Gateway 230V Mains Aggregation OFC ~ 20 km Network FTTH FTTH 8
NG-AN functions Erstwhile Telephone Exchange Building Re-christened as NG-AN, it serves as Aggregation point for all access technologies: Node-B DSLAM serving up to 2 km coverage area from exchange GPON OLT MSAN, ADM, PDH mux Subtends Layer-2 services to remotely located Access Node (Remote AN) to serve coverage area beyond 2 km (up to ~5 km) Provides a breakout point for Optical Network / Passive Optical Network Provides backhaul for both mobile and land line aggregation over converged MPLS/RPR/CE Centre for providing Access Related Customer Service > 2 km NG-AN Subtend 2 km max ON/PON DSLAM Exchange Building NODE-B or BTS Remote AN 2 km max NG-CE PC TV set Phone NG-CE PC TV set Phone 9
The NG-CO or Metro node converts data streams into services NG-AN NG-AN Service Enablement Function NG-CO NG-CN Nx-Gen Core Node NG-CO NG-CO NG-AN NG-CO Point of Interconnect International Gateway International External Networks 10
Metro node today Layer 3 MPLS VPN EDGE ROUTER SEF I/f SCF I/f Address Translate (v4/6, 10.x) Firewall Deep Packet Inspector Modem / TA bank GGSN IPSec / PPP term Media Transcoder BRAS Session Border Controller CE QOS Storage & Processing Home Gateway Policy enforcement Bandwidth Manager DASS2, DPNSS, SS7 handler Layer 2 frame Tier-1 Switch Ethernet Concentrator & Switch GFP/Martini/PWE3 FAD VoIP media & Sig g/w SDH ADM ATM Mux? G703 framer Content Server Content Storage CWDM Optical crossconnect Multiple switching technologies at metro node 11
Metro node tomorrow (Next-Gen Central Office or NG-CO) Layer 3 MPLS VPN EDGE ROUTER SEF I/f SCF I/f Address Translate (v4/6, 10.x) Firewall Deep Packet Inspector Modem / TA bank GGSN IPSec / PPP term Media Transcoder BRAS Session Border Controller CE QOS Storage & Processing Home Gateway Policy enforcement Bandwidth Manager DASS2, DPNSS, SS7 handler Content Server Content Storage Layer 2 MPLS Tier-1 Switch Multi-service aggregation done at NG-AN At NG-CO, Tier-1 switch is fully packetized 12
Next Gen - Central Office has 5 network functions Aggregates ~ 400K subs Scalable to 4mn. Routing & Transport Scale control plane IP/MPLS and Optical Integration 100GE Support Non-stop operations Packet handling & Security Multi-layer security protecting apps/services and infrastructure Scale subscribers, sessions and bandwidth Fixed Mobile Convergence Non-blocking Switch Fabric Interconnect supporting standards based interfaces to connect both networking and IT resources Subscriber/Enterprise Service Consolidate business, residential, fixed and mobile access in Unified Edge Scale subs, traffic & services Content Servers & Storage Caching & delivery of popular content/application Dynamic & network aware content delivery ON/PON DSLAM NODE-B or BTS Next Gen - Access Nodes 13
Transport Core node today MPLS Control Plane Layer 3 MPLS CORE ROUTER Client optics Costly DWDM transponders SDH switch Switches SDH VCs VC4 Packet switch i/f SDH switch i/f Multiple core networks Multiple sub-wavelength Multiplexing technologies To NG-CO DWDM Optical Patch Panel External fibres Switches wavelengths To other NG-CN 14
To NG-CO, NG-AN MPLS switches Transport Core node tomorrow (Next Generation Core node or NG-CN) MPLS Control Plane Core routers need to upgrade from STM16 to 10GE as access is now becoming 2.5G OTN Control Plane (optional) L3 MPLS CORE ROUTER DWDM Switches Packets Coloured optics Saves transponders cost Switches wavelengths To NG-CO Optical Patch Panel External fibres To other NG-CN Multi-service aggregation done at NG-AN NG-CN has only packet and wavelength switching 15
Interconnection model for NxGen-Nodes NG-CN Next-Gen Core Node NG-CO (4 lakh subs) Next-Generation Central Office Exchange housing Next-Gen Access Node NG-AN Phase I (10K) Phase II (10K) 16
NG CO Aggregation of Remote ANs TIER-1 Switch Primary ring Carrier Ethernet Backhaul over 10G (evolving to 100G) MPLS/RPR Ring structures connect to Tier-1 SW at NG - CO NG AN Erstwhile Exchange Building OLTE PON TIER-2 Switch Remote - AN SDH PON DSL Ba ck ha u l BTS OLTE Tier 3 switch Tier 3 switch Tier 3 switch Secondary ring Carrier Ethernet Backhaul over 10G MPLS/RPR Ring structures 1 Remote 2 - AN Remote 3 - AN Remote - AN PON DSL Remote - AN BTS PON DSL Remote - AN BTS PON DSL BTS PON DSL OLTE BTS PON DSL OLTE BTS Tier 3 switch Tier 3 switch Tier 3 switch Tier 3 switch OLTE OLTE OLTE BTS OLTE 4 5.. Remote - AN SDH PON DSL N = say 20 ADSL2+, FTTH RESIDENTIAL NG-CG HDSL (2 Mbps), VDSL, PDH, SDH, GE ENTERPRISE NG-CG 17
Aggregation of Remote-ANs at NG-AN Location of NG-AN (Tier-2 Switch) aggregating 25 Remote-ANs coverage 5 km radius) 10 22 1 23 2 3 4 5 6 N Location of Remote-ANs (coverage 1 km radius) 7 8 9 10 11 1 km 22 1 23 12 13 1 km 5 km 2 3 14 15 16 1 km 4 5 6 17 18 1 km 7 8 24 19 25 1 km 9 10 11 20 21 22 1 23 12 13 22 1 23 2 3 14 15 16 2 3 4 5 6 17 18 4 5 6 7 8 24 19 25 7 8 9 10 11 20 21 9 10 6 12 13 22 1 23 12 13 14 15 16 2 3 14 15 16 17 18 4 5 6 17 18 24 19 25 7 8 24 19 25 20 21 9 10 11 20 21 12 13 14 15 16 17 18 24 19 25 20 21 18
NxGen Unified Transport Architecture Converged Layer-2 aggregation network Extend MPLS up to NG-AN Circuit Emulation over Packets: SDH over MPLS using CEP (RFC 4842) PDH over MPLS using SAToP (RFC 4553) Mobile backhauling over MPLS 2G using SAToP, 3G/WiMax/LTE using Ethernet MPLS control plane Multi-vendor interoperability End to end MPLS tunnels from L2-MPLS and L3PE NG-AN NG-CO NG-CN NG-CO NG-AN 19
Transport Core requirements Optical Control Plane Restoration: Fast protection schemes using ITU-T G.841, Control plane protocols as defined in ITU-T G.771x series. Crank back, prioritised restoration Resilient to both node and complete duct failure No SDH switching SDH transported over MPLS Optical core only switches wavelengths Sub-wavelength multiplexing is fully packetized Jitter & Wander as per G.8251 (defines hops/ssu) MPLS Core routers must be carrier class & operationally stable 1 for n redundancy, modular software, hardware reliability, scalable High Performance Packet Switch Targets: 425us latency, 62 us jitter, max per hop Supports ATM CBR SLAs, ETSI compliant circuit emulation & PSTN 2.5 Gbps to10 Gbps interfaces Must support connection oriented services 20
Key attributes of optical transport & MPLS core Optical Core Use G.652 fibre The same control plane & restoration requirements as SDH Initially OEO moving to OOO Initial clients are SDH switches & Routers With colored interfaces on routers, optical core can become OOO MPLS Core Switches End to End MPLS tunnels from NG-AN and L3PE QoS to be DiffServ aware Traffic Engineering Security Must be impossible to hack from the Internet and by customers Current solution is No native IP in the core apart from the control plane OAM Must be able to manage connections Restoration at the appropriate network layers 21
NxGen Unified Control Architecture f(x) = a x? f(x) = Lg a x Does CAPEX and OPEX have to follow the traffic growth? How can Network Optimization help to close divergence? ALTTC, 05-08-2010 Acknowledgement: Adapted from Tekelec Presentation 33
Traffic growth Traffic Follows exponential growth patterns Applies to user plane and control plane (= signalling) f(x) = a x e.g. mobile usage Time 34
Revenue growth Revenue f(x) = Lg a x Follows logarithmic growth patterns Caused by volume discounts and flat rate plans Further accelerates traffic growth Creates the need for a controlled network growth Time ALTTC, 05-08-2010 Acknowledgement: Adapted from Tekelec Presentation 35
Solution approach How to avoid exponential CAPEX and OPEX growth in signalling networks? Lg a x Lg a x f(x) = a x f(x) = x f(x) = Lg a x 36
Taking the Logarithm of Numbers Logarithmic systems are hierarchical systems Decimal system is a typical example E.g. distinguish 1000 objects just by 3 decimal digits ( Lg 10 1000 = 3 ) 0 1 2 9 => creates a hierarchy of digits 0 1 2 9 0 1 2 3 4 5 6 7 8 9 A B C D E F Ђ Ω 37
Taking the Logarithm of Network Elements (step 1) Create network hierarchies with specialized nodes SCPs, STP/SGWs or SMS hubs are typical examples in signalling networks Specialized nodes 2 3 Basic nodes 1 2 1 2... 1 2 3 3 3 Supports a LINEAR network growth ALTTC, 05-08-2010 Acknowledgement: Adapted from Tekelec Presentation 38
Taking the Logarithm of Network Elements (step 2) Centralize signalling information Centralized databases Data 2 Data 3 Overlapping data creates synergies Specialized nodes Data 2 2 3 Data 3 Basic nodes 1 1... 1 Hierarchical signalling networks support a LOGARTHMIC network data growth ALTTC, 05-08-2010 Acknowledgement: Adapted from Tekelec Presentation 39
IMS follows logarithmic network growth First step: Decompose soft switch functionality into specialized nodes (e.g. P-CSCF, I-CSCF, S-CSCF, TAS, SCCP routing, SIP routing, SMS routing, etc.) Second step: Consolidate data into centralized databases which creates synergies and thus a logarithmic growth of information (e.g. MNP data, ENUM data, Measurement data, etc.) Optimization of Resources 40
Recap of 4-Stage FMC-IMS implementation Mobile TAS SMS IN MSC Soft Switch 1 SIP BSC UNC 2 SIP BSC S-CSCF DM UNC HSS XDMS I-CSCF 3 AAA HLR 4 SBC ICS GW P-CSCF MGW BSC RNC UMA WiFi LTE-SAE DSL Cable PSTN Note: The MSC is replaced in stage 4 by Mobile Telephone Application Server (TAS) and IMS Call Server Access Gate Way (ICS GW) 41
THANK YOU 42