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Slide title In CAPITALS 50 pt Slide subtitle 32 pt Advanced Paradigms for Building Convergent Next Generation Services. Service Composition and Service

Apr 02, 2015

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Slide title In CAPITALS 50 pt Slide subtitle 32 pt Advanced Paradigms for Building Convergent Next Generation Services. Service Composition and Service Brokerage in Multimedia Architectures Dr. Sorin Georgescu [email protected] Slide 2 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Multimedia Service Composition and Service BrokerageSorin Georgescu2 Agenda NG Service Platform Multimedia Services Ontology Service Composition Patterns Adding Semantics to Service Composition Enhancing the Business Model through Service Brokerage Slide 3 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Multimedia Service Composition and Service BrokerageSorin Georgescu3 Next Generation Networks Evolution Drivers Societal and Business trends Internet is becoming a major enabler of communications Consumers are embracing computing, mobile and digital technology in their everyday life Evolution of Business models require increased levels of personal mobility Societal and Business trends Internet is becoming a major enabler of communications Consumers are embracing computing, mobile and digital technology in their everyday life Evolution of Business models require increased levels of personal mobility Access Technology Enhancements HSPA (High Speed Packet Access) evolved WCDMA OFDMA (Orthogonal Frequency Division Multiple Access) 3GPP LTE, WiMAX, MBWA, ADSL/VDSL, DVB-T/H etc. Spatial Processing multi-antennas Base Stations supporting advanced spatial processing Access Technology Enhancements HSPA (High Speed Packet Access) evolved WCDMA OFDMA (Orthogonal Frequency Division Multiple Access) 3GPP LTE, WiMAX, MBWA, ADSL/VDSL, DVB-T/H etc. Spatial Processing multi-antennas Base Stations supporting advanced spatial processing Convergence Converged devices (Mobile, WLAN, Internet etc.) Connectivity Converged services Ease of use Converged networks Reliability, Security, Reduced OPEX/CAPEX Converged business models Increased margins, Avoidance of twin pitfalls risk Convergence Converged devices (Mobile, WLAN, Internet etc.) Connectivity Converged services Ease of use Converged networks Reliability, Security, Reduced OPEX/CAPEX Converged business models Increased margins, Avoidance of twin pitfalls risk Slide 4 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Multimedia Service Composition and Service BrokerageSorin Georgescu4 The Evolution to Multimedia Applications A Mobile View Non-Interactive Multimedia Image SMS MMS Presence Active phonebook Push-To-Talk Text Voice P2P Calls Video Person-to-Person dominates traffic growth Movies Photos Internet Text/Pictures SMS/MMS HTTP Streaming Download Video Music Ring tone Person-to-Content known usability patterns Interactive Multimedia Multimedia Content Social Networking Slide 5 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Multimedia Service Composition and Service BrokerageSorin Georgescu5 IMS 3GPP Architecture for Convergent Next Generation Services IMS is an open IP-based architecture using the Client-Server Network Computing model. 3GPP originally specified IMS to enable real-time multimedia services over the IP bearer, in GSM and W-CDMA networks. Later, 3GPP2 specified the MMD architecture for CDMA2000 networks based on IMS. 3GPP2 requirements are part of Common IMS in IMS release 8. The xDSL access, specified by TISPAN, is integrated into IMS. The cable access, specified by CableLabs in PacketCable 2.0, is part of IMS release 8. Interworking with WLAN was specified in IMS release 6, while the mobility with WiMAX has been addressed in EPC specifications. If IMS is not used: Multimedia communication at best effort Service roaming can be difficult to implement Provisioning and charging are service specific Compliance with LI requirements can be an issue If IMS is not used: Multimedia communication at best effort Service roaming can be difficult to implement Provisioning and charging are service specific Compliance with LI requirements can be an issue Slide 6 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Multimedia Service Composition and Service BrokerageSorin Georgescu6 IMS Service Routing the IFCs P-CSCF Visited A P-CSCF Visited B S-CSCF IMS AS HSS S-CSCF IMS AS HSS I-CSCF 1 2 3 4 Home A Home B 5 6 7 8 9 10 11 In comparison to IETF SIP Routing where the originator of SIP request may specify a preferred path in the Route header, in IMS the P-CSCF removes this path and ensures that IMS SIP Routing is followed. SIP requests in IMS architecture are always routed to the Home S-CSCF, in both the originating and terminating network. The S-CSCF uses subscribers Service Profile (downloaded during registration), to link-in the SIP AS which will process the SIP request. The Initial Filter Criteria (IFC) within the Subscriber Profile provide a simple service logic to decide which AS shall be linked-in. These rules are of static nature i.e. they do not change frequently. IMS Service Routing = Service Profile based Routing Slide 7 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Multimedia Service Composition and Service BrokerageSorin Georgescu7 Limitations of ISC Service Orchestration Model The application server decides whether to remain linked-in for the whole session by adding its address to the Record-Route SIP header. Application Servers are unaware of the existence of other AS', and whether these will be linked-in. No service or session state will be passed between application servers unless they use proprietary extensions i.e. are co-designed. Response messages are routed to the ASs in the reverse order S-CSCF HSS SIP-AS I-CSCF S-CSCF HSS SIP-AS I-CSCF If during call handling procedure an AS retargets the SIP request by changing the Request URI, subsequent filter analysis in the S-CSCF is stopped and the S-CSCF forwards the request towards the new target without linking-in the other AS specified by IFC. Req URI = A Req URI = B 1 2 Slide 8 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Multimedia Service Composition and Service BrokerageSorin Georgescu8 NG Service Platform The IMS-based Design Slide 9 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Multimedia Service Composition and Service BrokerageSorin Georgescu9 Slide 10 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Multimedia Service Composition and Service BrokerageSorin Georgescu10 NG Service Platform Functional Description Service Composition: Invokes the services published by external Service Providers which are interconnected in a Service Overlay Network. Services can be linked in statically (BPEL workflows) or dynamically, using their semantic description (OWL-S) Corresponds to the network-centric composition model => lower complexity of client implementation. Service Mediation: Mediates service protocols, data format, identity, security features, business processes Service Brokerage: Negotiates with other brokers in the Service Overlay Network the services which the Service Composition function will invoke. Uses context information to bind services based on dynamic conditions. Service Discovery: Publishes local services and performs service searches in the Service Overlay Network. Searches can be static (UDDI queries) or dynamic (UDDI queries with constrains, SWS Proxy queries). Slide 11 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Multimedia Service Composition and Service BrokerageSorin Georgescu11 Agenda NG Service Platform Multimedia Services Ontology Service Composition Patterns Adding Semantics to Service Composition Enhancing the Business Model through Service Brokerage Slide 12 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Multimedia Service Composition and Service BrokerageSorin Georgescu12 Service Modeling using Ontologies Gruber, 1993: An Ontology is a formal, explicit specification of a shared conceptualization of a domain. Formal = unambiguous, machine understandable, described using a formal language Explicit = precise, clarifying the subject Conceptualization = abstract representation of the object of study Gruber, 1993: An Ontology is a formal, explicit specification of a shared conceptualization of a domain. Formal = unambiguous, machine understandable, described using a formal language Explicit = precise, clarifying the subject Conceptualization = abstract representation of the object of study Ontologies consist of a set of axioms which place constrains on classes of individuals, and the types of relationships allowed between them. Can be described in graphical form (ex. RDF, UML) or logical form (ex. Description Logic, Rules). Ontologies consist of a set of axioms which place constrains on classes of individuals, and the