1. Lyngby, November 5, 2004 Halldór Matthías Sigurðsson Service Differentiation in Residential Broadband Networks Page 1 Service Differentiation in Residential Broadband Networks Lyngby, November 5, 2004 Halldór Matthías Sigurðsson (halldor@cti.dtu.dk) CICT Conference Presentation VoIP - Potentials and Challenges, Drivers and Barriers

2. Lyngby, November 5, 2004 Halldór Matthías Sigurðsson Service Differentiation in Residential Broadband Networks Page 2 Motivation INTERNET PSTN Modem CPE INTERNET PSTN Modem CPE TV CURRENTFUTURE Moving from several dedicated networks to converged multipurpose networks

3. Lyngby, November 5, 2004 Halldór Matthías Sigurðsson Service Differentiation in Residential Broadband Networks Page 3 Motivation Real-time communication (voice and video) pose timing constraints and end-to-end QoS Requirements

4. Lyngby, November 5, 2004 Halldór Matthías Sigurðsson Service Differentiation in Residential Broadband Networks Page 4 Resource Management Over provisioning –Provide more than you need Loose Control –Prioritise certain traffic Strict Admission –Resource Reservation Near future solution will be based on a combination of over provisioning and loose control

5. Lyngby, November 5, 2004 Halldór Matthías Sigurðsson Service Differentiation in Residential Broadband Networks Page 5 DSL Components +/- 2300 subscribers Copper wires DSLAM Aggregation Network BRAS CPE BRAS DSLAM ISP INTERNET AGGREGATION NETWORK SECOND MILE ACCESS NETWORK FIRST / LAST MILE CPE DSLAM BRAS

6. Lyngby, November 5, 2004 Halldór Matthías Sigurðsson Service Differentiation in Residential Broadband Networks Page 6 Current DSL Architecture Data centric Oversubscription Lack of Resource Management ISP INTERNET AGGREGATION NETWORK ACCESS NETWORK DSLAM BRAS CPE

7. Lyngby, November 5, 2004 Halldór Matthías Sigurðsson Service Differentiation in Residential Broadband Networks Page 7 CPE Levels of Competition ISP INTERNET DSLAM BRAS Internet –Public Garden Model –Lack of business models –Example: Internet services Inter Domain Inter Domain –Gated Garden Model –Based on profit sharing / Service level Agreements –Example: NTT DoCoMo’s I-mode Intra Domain –Walled Garden Model –Based on offering all services internally –Example: Telephony and Satelite Industry Intra Domain

8. Lyngby, November 5, 2004 Halldór Matthías Sigurðsson Service Differentiation in Residential Broadband Networks Page 8 Internet Video Internet Voice Inter Domain Voice Inter Domain Video Competition among Service Providers ISP INTERNET CPE DSLAM BRAS Intra Domain Voice Intra Domain Video Intra Domain Inter Domain Internet

9. Lyngby, November 5, 2004 Halldór Matthías Sigurðsson Service Differentiation in Residential Broadband Networks Page 9 Internet Voice Inter Domain Voice Inter Domain Video Scenario 1 Best Effort Current Situation Internet / Public Garden Model Network Access Provider must rely on income from transmission No QoS - Voice, video and data compete for resources Transmission characterised by bottlenecks and TCP ISP INTERNET CPE DSLAM BRAS Intra Domain Voice Intra Domain Video Best Effort

10. Lyngby, November 5, 2004 Halldór Matthías Sigurðsson Service Differentiation in Residential Broadband Networks Page 10 Internet Voice Inter Domain Voice Inter Domain Video Scenario 2 One Way Service Differentiation ISP INTERNET CPE DSLAM BRAS Intra Domain Voice Intra Domain Video Upgrade in BRAS (Same DSLAM and CPE) Downstream Prioritising – Upstream Competition Supports VoIP and VoD – Not television broadcasting Competing Service Providers are worse off HAN VoIP STB Priority Best Effort

11. Lyngby, November 5, 2004 Halldór Matthías Sigurðsson Service Differentiation in Residential Broadband Networks Page 11 Internet Voice Inter Domain Voice Inter Domain Video Scenario 3 Port Based Service Differentiation ISP INTERNET BRAS New CPE, DSLAM upgrade Port based prioritisation Supports VoIP, VoD and broadcast television Intra Domain / Walled Garden Model Discriminates Inter and Internet Service Providers HAN VoIP STB Intra Domain Video Intra Domain Voice CPE DSLAM Priority Best Effort

12. Lyngby, November 5, 2004 Halldór Matthías Sigurðsson Service Differentiation in Residential Broadband Networks Page 12 Internet Voice Scenario 4 Content Based Service Differentiation ISP BRAS New CPE, DSLAM upgrade Two way content based service differentiation Supports VoIP, VoD and broadcast television Inter Domain / Gated Garden Model Operators can choose which third party operators to allow access HAN VoIP STB Intra Domain Video Intra Domain Voice CPE DSLAM ISP Inter Domain Video Inter Domain Voice ISP INTERNET Priority Best Effort

13. Lyngby, November 5, 2004 Halldór Matthías Sigurðsson Service Differentiation in Residential Broadband Networks Page 13 Conclusion Residential Broadband Networks are moving towards converged voice, video and data transmission Operators are moving towards service differentiation Most likely path requires new equipment (both at customer and operator) Operators will choose a migration strategy that grants the market control Network Access Providers can discriminate competing service providers

14. Lyngby, November 5, 2004 Halldór Matthías Sigurðsson Service Differentiation in Residential Broadband Networks Page 14 Questions