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All rights reserved © 2006, Alcatel Benefits of Distributed Access Border Gateway in the Access Benoît De Vos Alcatel, May 29 th 2006
All rights reserved © 2006, Alcatel Page 2 Agenda Introduction, NGN reference architecture, SBC Distributed ABG Architecture Benefits & Challenges Conclusions & Next steps
All rights reserved © 2006, Alcatel Page 3 Introduction - Context Rapid Expansion of BB Access Ubiquitous delivery of best effort connectivities Free voice and video services over Internet, P2P Opportunity for Traditional Telcos: “Service Enablers” to keep control (IMS) and generate new revenues by improving the capabilities of the network New functions – integrating intelligence and higher layer services (L3+) in Access & Aggregation Networks
All rights reserved © 2006, Alcatel Page 4 Introduction NGN, simplified reference model PSTN IP Backbone Media Gateway Access Network Eth. EDGE CPN B Soft Switch ABG BC Application Server SS7 Network CPN A Access Network DSLAM SIP SBC located at edge and consisting of: -ABG Media -BC Signaling & Control ABG BC SIP NRC (Network resource Controller)
All rights reserved © 2006, Alcatel Page 5 Introduction Session Border Controllers BC handles signalling streams & control (= B2B User Agent) Allows operators to offer value-added features to the call Interacts with ABG to control media and signalling streams: NAT/Pinhole requests to ABG Adapt SDP in signalling streams with result of NAT by ABG Interacts with NRC (Network Resource Controller): QoS control (manage BW reservation / release) Inform charging entity (via RADIUS or Diameter) Protocol interworking (SIP, H.323, MGCP,…) ABG takes care of media streams Pinholing (opens and closes gates) Rate limiting Allocates adresses and ports for NAT (and performs for media streams) TOS remarking
All rights reserved © 2006, Alcatel Page 6 Disadvantages of current architecture Require dedicated NW element Extra cost, configuration, maintenance,… Resource control for Upstream Resources control in Access and Aggregation Network may be improved SPOF Number of user affected by a failure is important e.g. 100K users, 50 CAPS
All rights reserved © 2006, Alcatel Page 7 IP Backbone Eth. EDGE CPN C Access Network edge ABG BC SBC Operator 1: NAP1 + SP1 Owns its Sx IP Backbone ABG BC SBC ABG BC CPN A Access Network ABG BC Operator 2 : Owns its Sx Peering B2B SBCs DSLAM Soft Switch Application Server Central SBC – Combined App Retail & Wholesale SIP CPN B Wholesale Soft Switch Application Server SIP Retail Secured Overlay Network
All rights reserved © 2006, Alcatel Page 8 Distributed ABG – Combined App Retail & Wholesale IP Backbone Eth. EDGE CPN C Access Network SBC Operator 1: NAP1 + SP1 Owns its Sx IP Backbone ABG BC SBC ABG BC CPN A Access Network Operator 2 : Owns its Sx Peering B2B SBCs DSLAM edge BC ABG BC ABG Soft Switch Application Server SIP Extended Secured Overlay Network: includes Access and Aggregation Soft Switch Application Server SIP Retail CPN B Wholesale
All rights reserved © 2006, Alcatel Page 9 Benefits of Distributed ABG Architecture Secure (Overlay) network extended to the Access Nodes QoS control extended to Access and Aggregation Network (End-2-End) Shaping at ingress of the NAP network, limiting the upstream load on the aggregation part of the network Possible local management of line capacity Protect BC of DoS attacks (signalling) @ NW access. by limiting initial Upstream signalling rate in ABG. Better Scalability (smaller number of users per ABG ) Robustness (SPOF for far less users than ABG at edge) Potential Cost reduction (if integrated on existing AN hardware and BC in Sx)
All rights reserved © 2006, Alcatel Page 10 Challenges of Distributed ABG Session setup and signalling flows Communication between ABG and BC and Interaction with signalling ! Via MIDCOM protocol ? (Diameter / Megaco) Many parameters to be transferred – Ping Pong over A&A NW – Timing issues ? Integration into Access Nodes Optimal integration should not rely on use of dedicated resources (blade, NP…) Should be smartly integrated with existing designs to save cost, space resources Initiatisation, Configuration of ABG Need to configure ABG to allow first signalling at limited rate. Based on Dest IP @ of Border Controller Major
All rights reserved © 2006, Alcatel Page 11 Next steps Distributing intelligence in the network; step-wise approach Distributed ABG Data plane intelligence only Distributed SBC (SBC = ABG + BC) Data plane + control plane intelligence Distributed IMS/NGN (SBC + SoftSwitch) Data plane + full control plane intelligence NGN Edge SBC Central architecture Current Deployments IST Muse 1 ICIN Session 1B: QoS IST Muse 2 First ideas in ICIN Session 9 : P2P
All rights reserved © 2006, Alcatel Page 12 IP Backbone Next steps Distributed SBC Eth. EDGE CPN C Soft Switch Application Server CPN B Access Network SIP AN ABG BC NRC SIP SBC Operator 1: NAP1 + SP1 Owns its Sx IP Backbone ABG BC SBC ABG BC Soft Switch Application Server CPN A SIP Access Network NRC ABG BC Operator 2 : Owns its Sx Peering B2B SBCs
All rights reserved © 2006, Alcatel Page 13 Next steps Distributed NGN / SX Access Network IP Backbone CPN A NAT or No NAT in RGW SIP unaware Access Network EDGE Central functions ? for billing… SX functions, ABG media and BC control functions into the Access Node EDGE Peer to peer communications between acceess nodes DSLAM ABG BC SX DSLAM ABG BC SX DSLAM ABG BC SX Presentation ICIN 2006 Session 9 : P2P
All rights reserved © 2006, Alcatel Page 14 Conclusions Opportunity to integrate functions of existing central equipments (SBC) into existing elements of Access and Aggregation Network. Bring intelligence closer to the End user Distribute functions to improve efficiency and cost Distributed ABG, first step To be continued with D-SBC, D-NGN
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