1. UCT-COE Seminar Page 1 January 23, 2016 Vitalis G.O Neco Ventura Charging QoS-Enabled Services in Inter-domain IMS Frameworks Department of Electrical Engineering University of Cape Town

2. UCT-COE Seminar Page 2 January 23, 2016 Introduction QoS requirements in IMS Frameworks Inter-domain service brokering Pricing IMS services Policy and charging control – 3GPP approach Relevant Protocols Execution plan Work in standards

3. UCT-COE Seminar Page 3 January 23, 2016 IMS QoS Requirements QoS for media plane: delay, jitter, and throughput QoS for IMS signaling Pricing and charging relates to QoS Policy and charging control done together

4. UCT-COE Seminar Page 4 January 23, 2016 Inter-domain Service Brokering AD1 = AN1:CN1 AD1 = AN1:CN1 AD2 = AN2:CN2 AD2 = AN2:CN2 AD1 outsources AN1 users to AD2 on AN2 AD1 outsources AN1 users to AD2 on AN2 QoS or price triggered QoS or price triggered Inter-domain signalling between IM1 and IM2 on Mm reference point Inter-domain signalling between IM1 and IM2 on Mm reference point

5. UCT-COE Seminar Page 5 January 23, 2016 Pricing the IMS Which traffic to charge? What model to use? –Flat rate for IMS session traffic –Usage based charges for bearer plane traffic Predictable access network-dependent charges Retain low Internet charges for core network traffic

6. UCT-COE Seminar Page 6 January 23, 2016 Core Network Prices AD1 and AD2 provision resources from different ISPs using long term SLAs AD1 and AD2 provision resources from different ISPs using long term SLAs Abstraction: ISP sells bandwidth in aggregate blocks to AD1 and AD2 Abstraction: ISP sells bandwidth in aggregate blocks to AD1 and AD2 Admission cost component rises with no. of sold BW blocks Admission cost component rises with no. of sold BW blocks

7. UCT-COE Seminar Page 7 January 23, 2016 Profitable Condition P N ≥ 0 P N ≥ 0 I = sessions I = sessions J = CoS J = CoS N = users N = users T = time T = time V = volume of traffic V = volume of traffic B = bandwidth blocks B = bandwidth blocks

8. UCT-COE Seminar Page 8 January 23, 2016 Outsource Triggers Link failure: calls dropped, blocked, failed Revenue vs. cost imbalance: provisioned resources to cost more than revenue from extra users

9. UCT-COE Seminar Page 9 January 23, 2016 Benefits and Conditions for Outsourcing Conditions P Σ > P N Candidate network must offer lower per flow charges for outsourced sessions Benefits Increased revenue for both operators Boosted user satisfaction

10. UCT-COE Seminar Page 10 January 23, 2016 Requirements for Outsourcing Inter-domain policy and charging control message interaction over the Mm reference point Inter-domain policy and charging control message interaction over the Mm reference point

11. UCT-COE Seminar Page 11 January 23, 2016 Outsourcing Transactions SDP negotiation (request) between client and custodian network SDP request (required QoS, preferred access network etc.) and price offer to candidate network SDP answer and AA parameters for client from candidate network SDP answer to client with instruction to attach to candidate network Registration on candidate network: subscriber information exchange IMS session setup continuation via candidate network Accounting session initiation for IMS and media traffic

12. UCT-COE Seminar Page 12 January 23, 2016 Relevant Protocols and Specifications SIP - IETF RFC3261 DIAMETER – IETF RFC3588 SDP – IETF RFC3264 DiffServ – IETF RFC2475 3GPP TS 23.203– Policy and charging control

13. UCT-COE Seminar Page 13 January 23, 2016 Questions and Comments