Day 2-t9-1530 peter-nas-20120524


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LTE World Summit Barcelona May 2012 Day 2

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Day 2-t9-1530 peter-nas-20120524

  1. 1. F5 Traffix: Diameter Routing UseCases for the Signaling ExplosionBarcelona, 24th May 2012
  2. 2. 2Agenda• Introduction• Problem description• Use cases and solutions• Summary © F5 Networks, Inc.
  3. 3. 3 Introduction With data use at unprecedented levels due to smart phone popularity and usage patterns, signaling in the LTE network presents use cases never before experienced by operators. Yes we all might have plenty of signaling experience…. but how about Diameter signaling behavior??3 © F5 Networks, Inc.
  4. 4. 4 What is the Fundamental Pain: Explosive Mobile Data Growth What is the pain? - Need to expand capacity but with much lower revenues - How to keep the costs well below the revenue line Bring costs per Mb down: Launching of LTE networks (..trend towards All-IP)4 © F5 Networks, Inc.
  5. 5. 5Why Diameter? Signaling Growth Predictions • Smartphones, tablets Data and Signaling Growth and mobile broadband spread • IP-based services multiply • Usage patterns change Source: F5 and various secondary research • LTE • Network architecture changes and growth • New trends increase signaling load (M2M, VoLTE, virtualization)5 © F5 Networks, Inc.
  6. 6. 6 What is SO different?!! • SS7 signaling is much more voice/conversational services oriented, Diameter is mobility management AND database access oriented • Initially much more mobility management due to LTE Islands • Diameter is a session oriented peer-to-peer protocol and not like SS7 designed for networks, meaning things like: • no dedicated management messages, failures ‘to discover’ with each new request, relies on reliable transport, no defined traffic priorities, etc. • Customer and application + handset behavior much more unpredictable • Unpredicatable when, where and how it will hit you... • Massive smartphone signaling after “incidents”6 © F5 Networks, Inc.
  7. 7. 7LTE is happening now… 60+ networks launched 269 LTE devices7 © F5 Networks, Inc.
  8. 8. 8Meet the LTE Challenges• Element Connectivity • How to design a scalable network architecture • Many new network elements and traffic growth• Message Normalization • How to deal with different vendor’s Diameter implementations• Load Balancing • How to avoid careful planning per server • How to protect against signaling spikes, signaling Tsunami• Routing and Subscriber Guidance • How to guide transactions toward specific servers • How to manage network-wide routing and binding (like to PCRF, OCS)• Roaming for LTE • How to manage LTE - LTE global roaming • How to manage LTE – 2G/3G interworking• Topology Hiding • How to hide network topology • How to add clients and servers to the network without changing others• Visibility into Diameter Control Plane • How to view what’s going on • How to test and simulate with minimal impact 8 © F5 Networks, Inc.
  9. 9. 9 How to manage those differences and create new opportunities• Use a load balancer (and smart router) in front of your billing systems and/or elements like HSS, PCRF• Protect your network for high Diameter signaling loads to nodes like OCS, HSS, PCRFs• Protect your Radius servers from smartphone generated signaling peaks• Have a gateway between Diameter and LDAP, Radius, SS7-MAP and others • Re-use existing investments and processes• DRA, DEA, IWF for LTE networks • Internal network • Create a scalable architecture • Manage signaling loads • Roaming for LTE• MVNO market• IMS, more Diameter signaling9 © F5 Networks, Inc.
  10. 10. 10Use Case: Diameter Router for Charging andDRA/DEA OCS pool 1 Gx/Gy Gy GGSN OCS Gx/Gy OCS pool 2 Gy GGSN OCS S6a Gx MME PCRF PCRF S6a S6a/S6d MME HSS HSS IPv4 SCTP Key use cases: IPv4 TCP (could be IPv6, - Routing between MME and HSS IPsec, TLS, etc. as well - Routing & balancing to OCS (ongoing)10 - Session binding (ongoing)© F5 Networks, Inc.
  11. 11. 11Policy Control Ready for the Next WaveHow a PCRF is connected with a range of Diameter interfaces: Subscription AF Online Charging System (OCS) Profile Sp Repository Service Data (SPR) Flow Based Rx Credit Control HPLMN VPLMN Policy and Charging Rules S9 Function Policy and Charging (H-PCRF) Rules Function (V-PCRF) Sy AF= Application Function BBERF= Bearer Binding & Event Reporting Function Sd Gx TDF= Traffic Detection Function Gxx PCEF= Policy & Charging Enforcement Function Gy BBERF TDF PCEF Offline Gz Charging System (OFCS) Gateway Source: 3GPP TS 23.203 © F5 Networks, Inc.
  12. 12. 12 Use Case: Overload Protection • (Over)load control or better flow control • We limit load before OCS Or in other words: Never hit OCS load control mechanism with undesired side effects Flow control Overload control by OCS • Also applicable to other elements like HSS, PCRF, etc.12 © F5 Networks, Inc.
  13. 13. 13 XXX Network Diagram Optimized GGSN-1 Charging System GGSN-2 Server 1 GGSN-3 Charging System GGSN-4 Server 2 GGSN-5 Charging System GGSN-6 Server 3 GGSN-7 Charging System GGSN-8 Server 4 Hmm, this is a mesh.. or mess GGSN-9 Charging System GGSN-10 Server 5 Note: one server can handle 85% GGSN-11 Charging System Server 1.1 – active serverGGSN-1-1 ..... Charging SystemGGSN-1-8 Server 1.2 – active server13 © F5 Networks, Inc.
  14. 14. 14 Use Case: Contextual Routing Routing Example based on IMSI Maintains a database routing DB mapping between IMSIs and OCSs IMSI is extracted from Subscription-Data Grouped AVP in CCR-I/AAR OCS pool 1 IMSI Range: CCR IMSI 11112 1xyz-4xyz CCR IMSI 11112 GGSN-1 CCR IMSI 55555 OCS CCR IMSI 22222 CCR IMSI 22222 OCS pool 2 IMSI Range: 5xyz-9yxz GGSN-2 CCR IMSI 55555 OCS14 © F5 Networks, Inc.
  15. 15. 15 Use Case: Load Balancing GGSN-1 OCS-1 Session 4 Session 5 GGSN-2 OCS-2 GGSN-315 © F5 Networks, Inc.
  16. 16. 16 Use Case: Protocol Gateway Diameter LDAP PCRF Directory Server Diameter Billing HTTP GGSN Billing Diameter MAP MME HLR Diameter, RADIUS, LDAP, SQL, HTTP, COPS, GTP’, Web-Services, JMS, MAP, CAMEL, CORBA16 © F5 Networks, Inc.
  17. 17. 17 Use Case: LTE Roaming Guidelines• Defined in GSMA PRD IR.88• Diameter solution can be installed at VPMN, HPMN and IPX level VPMN HPMN S6a IPX MME HSS S6d Proxy Proxy Proxy Proxy S4 Agent Agent SGS SGSN S9 v-PCRF h-PCRF17 © F5 Networks, Inc.
  18. 18. 18 Use Case: Specialized applications like: • LTE Traffic Steering HPLM HSS Non preferred 3rd party applications network DSR VPLM1 VPLM2 MM MME MME • External events based routing • Like priority routing during “Katrina events” • Billing proxy18 • MVNO/MVNE security functions © F5 Networks, Inc.
  19. 19. 19 Conclusions • Diameter signaling is a fundamental part of 3G, LTE and IMS networks • Network usage, signaling, is very different than before • Unpredictable • Users, handsets and applications driven • Purpose built Diameter Routers are needed • Best place for DRA, DEA and more • Diameter Routers are ideal place to add more value • Spider in value-add web19 © F5 Networks, Inc.
  20. 20. 20 Peter Nas Sr Solutions Architect Sales Mobile: +31 628 02 59 28 E-mail: p.nas@f5.com20 For more information visit us at: © F5 Networks, Inc.
  21. 21. 21 Where to use a IWF/translation agent VPLMN HPLMN Network S6, Diameter Network Element Element with Diameter with Diameter & MAP & MAP MME HSS MAP, SS7 HLR SGSN EIR…21 © F5 Networks, Inc.