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What kind of signalling issues have to be solved by introducing LTE?
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What kind of signalling issues have to be solved by introducing LTE?

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FUSECO Forum 15th-16th November 2012, Berlin ...

FUSECO Forum 15th-16th November 2012, Berlin
E-Plus Mobilfunk GmbH & Co. K

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  • 1. What kind of signalling issues have to besolved by introducing LTE?FUSECO Forum 15th-16th November 2012, Berlin15.11.12E-Plus Mobilfunk GmbH & Co. KG
  • 2. Introduction E-Plus Group•  E-Plus Mobilfunk GmbH founded 1993•  Subsidiary of KPN N.V.•  Third largest MNO in Germany•  Service revenue 3,098 bn Euro in 2011•  24M customers end of 3Q/2012•  Prepaid customers: >65%•  Multiple Brands: •  Strongest wholesaler in the market:E-Plus Mobilfunk GmbH & Co. KG 15.11.12 Seite 2
  • 3. Diameter interfaces in LTE and IMS ShCx-subscriber profileGx-QoS IMS-ASGy-prepaid charging RoGz-postpaid charging Cx ISCRf-charging IMSRo-charging I-S-/CSCF S6dRx-QoS HSS RfS6a-authentication Rx P-CSCF OCS/S6d-authentication OFCSS9-QoS Gy/Gz Gx Gx GGSN PCRF S11 P-GW PC S5 S3 EPC SGSN MME S-GW A/Iu -c S1-c S1-u Foreign 2G/3G LTE NetworkE-Plus Mobilfunk GmbH & Co. KG 15.11.12 Seite 3
  • 4. Load- /Network Management HSS HSS HSS HSS HSS HSS HSS HSS MME MME MME MME MME MME HSS HSS HSS HSS HSS HSS HSS HSS DRA MME MME MME MME MME MMEE-Plus Mobilfunk GmbH & Co. KG 15.11.12 Seite 4
  • 5. Load- /Network Management • Subscriber profile available HSS on all HSS-FE, due to CUDB -BE architecture • Just a few boxes needed, due HSS HSS HSS to low subscriber base in the -FE -FE -FE early stage MME MME MMEE-Plus Mobilfunk GmbH & Co. KG 15.11.12 Seite 5
  • 6. Policy Binding • How to ensure, that all messages P-CSCF for the same subscriber are Rx routed to the same PCRF? • How to perform loadsharing PCRF to PCRF‘s? • How to bind Gx- and Rx-messages for the same PCRF subscriber? Gx PCRF PGWE-Plus Mobilfunk GmbH & Co. KG 15.11.12 Seite 6
  • 7. Policy Binding • DRA ensures, that all messages P-CSCF for the same subscriber are routed to the same PCRF • DRA enables PCRF scalability Rx PCRF by loadsharing to PCRFs Rx DRA • DRA binds Gx- and Gx Rx-messages for the same PCRF subscriber Gx PCRF PGWE-Plus Mobilfunk GmbH & Co. KG 15.11.12 Seite 7
  • 8. Policy Binding • PGW routes all messages for the P-CSCF same subscriber to the same Rx PCRF based on IMSI ranges • Static loadsharing at PGW to PCRF PCRF‘s is used based on IMSI ranges • CSFB instead of IMS is used. PCRF Thus, no P-CSCF exist and no binding of Gx- and Rx-messages ge-3) is needed. Gx (IMSI ran PCRF PGWE-Plus Mobilfunk GmbH & Co. KG 15.11.12 Seite 8
  • 9. Mediation Adapts Diameter variants of different vendors HSS -BE MME PGW Diameter Diameter PCRF DRA Variation 1 Variation 2 Vendor A Vendor B HSS -BE MME PGW Diameter PCRF Variation 1 Vendor A Vendor B New Vendor B has to adapt Diameter variant of existing Vendor AE-Plus Mobilfunk GmbH & Co. KG 15.11.12 Seite 9
  • 10. Congestion Control and Overload Protection • User-configurable TPS control per connection • Peer application/transport HSS congestion control S6a /C x/Sh S6a MME Gx/Rx Gx/Gy DRA PCRF Gy /RxPGW C x/Sh OCS CSCF/AS S6a HSS MME Cx/Sh Low traffic in the early Rx beginnings of LTE, thus no need for DRACSCF/AS PCRF Gx Gy PGW OCSE-Plus Mobilfunk GmbH & Co. KG 15.11.12 Seite 10
  • 11. Topology Hiding/Roaming • Topology hiding • Policy enhanced roaming steering • Diameter message mediation HSS HSS MME MME S6a MME S9 DRA DRA S9 PCRFPCRF S6a PCRF PCRF HSS MME HSS VPLMN MME HPLMN MME No roaming in the early HSS beginnings of LTE, thus no HSS MME need for DRA MME S6a MME S9 DRA DRA S9 PCRFPCRF S6a PCRF PCRF HSS MME HSS VPLMN MME HPLMN MMEE-Plus Mobilfunk GmbH & Co. KG 15.11.12 Seite 11
  • 12. Monitoring/Trouble shooting • Just a few probes are needed for tracing purposes • Some products do have HSS MME HSS MME internal tracing capabilities x/Sh HSS /C MME S6a S6a Gx/Gy Gx/Rx DRA PCRFPGW Gy PCRF PGW /Rx C x/Sh OCS Alternatively, a lot of new OCS CSCF/AS CSCF/AS probes are needed for tracing purposes S6a MME HSS MME HSS MME Cx/Sh HSS RxCSCF/AS CSCF/AS PCRF Gx PCRF Gy PGW OCS PGW OCSE-Plus Mobilfunk GmbH & Co. KG 15.11.12 Seite 12
  • 13. Conclusion Diameter is one of the most important protocols within LTE A Diameter Router Agent DRA helps you to solve the challenges while introducing LTE It is not a question whether it makes sense to introduce a DRA, it is more a question when to introduce it! It might be cheaper and faster not to introduce a DRA for the initial LTE launch, but you might have major efforts while introducing it laterE-Plus Mobilfunk GmbH & Co. KG 15.11.12 Seite 13