Contents. UMTS Core Network II. Core Network Concepts From the previous lectures. UMTS Network Architecture From the previous lectures
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1 1 Antti Vainio T CN_Lecture2.PPT / Contents Flashback from the previous lectures UMTS Core Network II Communication Management Connection Management Session Management T Special Course in Data Communications and Networks Antti Vainio Core Network architecture evolution CS domain evolution IP Multimedia Subsystem (IMS) Multimedia Broadcast / Multicast Service (MBMS) 2 Antti Vainio T CN_Lecture2.PPT / UMTS Network Architecture From the previous lectures Core Network Concepts From the previous lectures RADIO ACCESS NETWORK CORE NETWORK Concepts Location hierarchy Identities used in UMTS M SC/VLR G BS AC EIR HLR External Networks Core Network Functions Mobility Management (MM) GPRS Mobility Management (GMM) 3 Antti Vainio T CN_Lecture2.PPT / Antti Vainio T CN_Lecture2.PPT / Communication Management Division between CS and PS Domains Operation Principle Communication Management Incoming transaction Number Analysis Routing Outgoing transaction Charging CS Domain PS Domain I II III Connection Management (CM) Session Management (SM) Phase I Called number analysis Restriction check Phase II Transaction type Interworking Chargeability Statistics System knows where to route the connection Phase III Release resources 5 Antti Vainio T CN_Lecture2.PPT / Antti Vainio T CN_Lecture2.PPT /
2 7 Antti Vainio T CN_Lecture2.PPT / Call Structure Call consists of legs (two or more) Leg types Mobile Originated Call (MOC) Mobile Terminated Call (MTC) PSTN Originated Call (POC) PSTN Terminated Call (PTC) Network Interworking Interworking required when call goes beyond UMTS network border Modems, rate adapters Echo canceling Digital-to-analog / analog-to-digital conversion Acoustic echo Echo Canceling equipment (EC) CM functionality is distributed Serving /VLR handles MOC & MTC legs G handles POC & PTC legs EC Radio Access Network EC /VLR EC 8 Antti Vainio T CN_Lecture2.PPT / Concepts Charging Billing Accounting Charging Charging information in UMTS may be time, volume or QoS based Requirements Impacts of commercial model Fraud control Itemised billing Charging is based on Call Detail Records (CDR) Charging CDR Contents Charged party identity Terminal identity and class Called address Used 3G resources QoS parameters Serving 3G network and network element identities Time stamps MM information CDR identity 9 Antti Vainio T CN_Lecture2.PPT / Antti Vainio T CN_Lecture2.PPT / Session Management (SM) Session Management - Example Creates an illusion of always-on packet connection to the end user It is possible to active, deactivate and modify packet connections (i.e. sessions) SM states: Active and Inactive SM is dependent on lower level entities: GMM and RRC Request Context Activation PDP Context Activation Procedure RAB & CN Bearer Allocation Packet Data Protocol (PDP) takes care of the actual packet data transfer Normally IP PDP Context IP addresses Connection type QoS Packet data transfer is possible from to od example in the course book, p. 123 Some notes Network resource savings whenever possible Network may request context activation has to accept / deny SM is dependant on lower level entities 11 Antti Vainio T CN_Lecture2.PPT / Antti Vainio T CN_Lecture2.PPT /
3 13 Antti Vainio T CN_Lecture2.PPT / R99 First UMTS release Clear distinction between CS and PS domain Clear hierarchy Evolved from the existing GSM architecture Main enhancement: WCDMA radio access Discussed already on this and previous lecture R4 Traffic transport over IP CS Domain evolution Server CM functionality MM functionality VLR Media Gateway () Switching and interworking functions Transcoders, echo canceling, modems M SC/VLR Server 14 Antti Vainio T CN_Lecture2.PPT / All-IP R5 IP Multimedia Subsystem IP-based signaling (Session Initiation Protocol, SIP) Elements supporting IP multimedia services Utilizes PS domain, independent of CS domain Security and charging functionalities Relies on Mobility Management provided by PS domain Aim: conformable with IETF Internet Standards Enables offering multimedia services based on and built upon Internet applications, services and protocols 15 Antti Vainio T CN_Lecture2.PPT / Antti Vainio T CN_Lecture2.PPT / Proxy Call State Control Function First contact point within IMS Accepts / Forward SIP requests Includes Policy Control Function () 17 Antti Vainio T CN_Lecture2.PPT / Antti Vainio T CN_Lecture2.PPT /
4 19 Antti Vainio T CN_Lecture2.PPT / Interrogating Call State Control Function Contact point within operator s network Assigning to a user Topology Hiding Inter-network Gateway (THIG) Serving Call State Control Function Session control for the Maintain session state 20 Antti Vainio T CN_Lecture2.PPT / Home Subscriber Server HLR, UMS User identification Access authorization Service authorization Application Server Offers value added IP multimedia services Hosts and executes services decides which information is given to based on information from 21 Antti Vainio T CN_Lecture2.PPT / Antti Vainio T CN_Lecture2.PPT / Multimedia Resource Function (Controller / Processor) x incoming media streams Media stream source Media processing Breakout Gateway Control Function Selects the network in which PSTN breakout is to occur i.e. forwards calls directed to PSTN to correct place 23 Antti Vainio T CN_Lecture2.PPT / Antti Vainio T CN_Lecture2.PPT /
5 25 Antti Vainio T CN_Lecture2.PPT / Media Gateway + Control Function Terminate bearer channels from CS network and from packet network (e.g. RTP stream) Protocol & media conversion R5 Iu Flex Break strict hierarchy (I.e. is not anymore tied to a single / server) Pool of CN nodes Benefits Scalability Load balancing Less signaling PS Pool Area Area 1 Area 3 Area 2 CS Pool Area Area 4 PS Pool Area 26 Antti Vainio T CN_Lecture2.PPT / R6 Left-over items from R5 Regulatory requirements Presence Instant Messaging Etc New work items UMTS WLAN interworking Multimedia Broadcast / Multicast Service R6 Multimedia Broadcast / Multicast Service IP Multicast Netw ork Currently available multicast / broadcast services in UMTS Cell Broadcast Service (CBS) IP multicast support (R99) 27 Antti Vainio T CN_Lecture2.PPT / Antti Vainio T CN_Lecture2.PPT / R6 Multimedia Broadcast / Multicast Service Summary Communication Management Connection Management for CS domain Session Management for PS domain IP M ulticas t Netw ork Efficient utilization of resources in CN and Unidirectional, pointto-multipoint bearer service for IP packets Two modes of operation Core Network architecture evolution R99 Evolved from GSM System R4 IP transport of CN protocols CS Domain evolution R5 All-IP IP Multimedia Subsystem R6 Multimedia Broadcast / Multicast Service 29 Antti Vainio T CN_Lecture2.PPT / Antti Vainio T CN_Lecture2.PPT /
6 31 Antti Vainio T CN_Lecture2.PPT / References Books Kaaranen et al., UMTS Networks Architecture, Mobility and Services Korhonen, Introduction to 3G Mobile Communications 3GPP Specifications Network architecture TS Network Architecture (Release 5) IMS TS IP Multimedia Subsystem (IMS); Stage 2 (Release 6) TS Intra-domain Connections of Radio Access Network () s to Multiple Core Network (CN) s (Release 5) MBMS TS Multimedia Broadcast / Multicast Service (MBMS); Architecture and Functional Description (Release 6) TS Multimedia Broadcast / Multicast Service; Stage 1 (Release 6)
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