IMS Overview Vincente D Ingianni Director of Professional Services

IMS Overview Vincente D’Ingianni Director of Professional Services Binary Systems, Inc. vincente@binary-systems. com www. convergencetechnologycenter. org DUE 402356

Contents Ø Ø Ø Ø What is IMS? Basic Principles IMS building blocks IMS Architecture Why all the excitement? Who needs IMS Problems Conclusions www. convergencetechnologycenter. org 2

What is IMS? n IMS is an architecture, it is not a protocol. n Open-systems architecture that supports a range of IP-based services over both Private and Carrier networks, employing both wireless and fixed access technologies. n IMS is defined by 3 GPP. www. convergencetechnologycenter. org 3

Basic Principles n Access Independence n Different Network Architectures n Terminal and user mobility n Extensive IP-based services www. convergencetechnologycenter. org 4

IMS Building Blocks 1. An all-IP Core Network (CN) 2. An all-IP Radio Access network (RAN) 3. Multimedia call control based on SIP 4. Quality of Service (Qo. S) support for IP www. convergencetechnologycenter. org 5

IMS Architecture Application Layer SIP / OSA / CAMEL AS AS Management Control Layer MRF SIP, IP Provisioning HSS CSCF SG/MGCF Connectivity & Access Layer Charging MGW IP/MPLS PSTN/PLMN Number Mapping GERAN, UTRAN, WLAN, x. DSL, . . . www. convergencetechnologycenter. org 6

IMS Architecture HSS: Home Subscriber Server CSCF: Call Session Control Function: SGW Applications and Services Operator 1 I-CSCF: Interrogating CSCF BGCF OSA-SCS BGCF: Breakout Gateway Control Function AS: Application Server CSCF MRFC: Multimedia Resource Function Controller MRFP: Multimedia Resource Function Processor MGCF MGW AS SGW MRFC SCP: Service Control Point MGW: Media Gateway BGCF IM-SSF P-CSCF: Proxy CSCF MGCF: Media Gateway Control Function CSCF HSS S-CSCF: Serving CSCF Multimedia IP Networks Operator 2 MRFP CS Domain - or PSTN - or Legacy - or External GGSN Alternative Access Network Mobile GERAN UE SGSN UTRAN www. convergencetechnologycenter. org 7 6

Terminal Service 3 Service 2 Service 1 Vertical vs. Horizontal Architecture Common functions Network logic Terminal Replicated - not reusable Terminal Routing Network logic Terminal Replication of common functions Application logic Common functions Routing www. convergencetechnologycenter. org 8

Why all of the excitement? n n n Imagine starting a voice call on you home phone and transferring it seamlessly to your mobile as you drive to work. Imagine sending a multimedia message from your car that later appears on your TV screen. Imagine watching a movie on that same TV, pausing it in mid-show and then watching it on a wireless PDA as you relax in the garden. Imagine having a cell phone conversation with two or three friends and simultaneously sharing a video of the football match you are attending. Imagine that all of the above can be done with a single account, on a single log-in with multiple devices over any number of access networks These are only a few examples of seamless multimedia services that IMS will allow users to access “anywhere” at “anytime” www. convergencetechnologycenter. org 9

Who needs IMS? Fixed Network Users want n Multimedia Conferencing n Voice over IP n Streaming Services Mobile Network Users want n Push-to-X n Location Based Services n Mobile Gaming www. convergencetechnologycenter. org 10

Who needs IMS? Network Providers want n n n Fixed Mobile Convergence One service - one implementation for all access types New Business Models www. convergencetechnologycenter. org 11

An everyday scenario Vincente Mobile phone Daniel Mobile phone call In a taxi from the airport. . . Gerry Mobile phone call Walking to the office. . . Jacqueline www. convergencetechnologycenter. org 12

An everyday scenario Vincente Mobile phone Daniel Activates Video mode In a taxi from the airport. . . Gerry Mobile phone Views Images on his mobile Walking to the office. . . Jacqueline www. convergencetechnologycenter. org 13

An everyday scenario Mobile phone Vincente Daniel Mobile phone Buddy list > select project work group Initiate PTT session Join PTT session In a taxi from the airport. . . Walking to the office. . . Gerry Jacqueline Join PTT session In the office. . . Office PC Join PTT session In the office. . . www. convergencetechnologycenter. org Fixed line phone 14

An everyday scenario Vincente Laptop Computer Daniel Mobile phone Buddy list > personal list Invite others to Videoconference Join Videoconference At the hotel. . . Walking to the office. . . Gerry Jacqueline Join Videoconference In the office. . . Office PC Join Videoconference In the office. . . www. convergencetechnologycenter. org Fixed line phone 15

An everyday scenario Vincente Laptop Computer Daniel Participates in Videoconference At the hotel. . . Participates in Videoconference Walking to the office. . . Gerry Jacqueline Opens presentation and shares it with his colleagues In the office. . . Mobile phone Office PC Participates in Videoconference In the office. . . www. convergencetechnologycenter. org Fixed line phone 16

An everyday scenario Vincente Laptop Computer Daniel Office PC Participates in Videoconference Switches from Mobile to PC At the hotel. . . Arrived in the office. . . Gerry Jacqueline Participates in Videoconference In the office. . . Office PC Participates in Videoconference In the office. . . www. convergencetechnologycenter. org Fixed line phone 17

Problems and open issues n n n Architecture complexity. Guarantees of Qo. S. IETF and 3 GPP standardisation co-operation. SIP and IMS architecture are not mature enough to guarantee fully functioning network. Terminal complexity. www. convergencetechnologycenter. org 18

There is still work to be done. . n The current work in 3 GPP is still unfinished and the discussion with IETF has just been started. n The specification work still continue now. www. convergencetechnologycenter. org 19

Selected Acronyms 3 G Third Generation 3 GPP(2) Third Generation Partnership Project (2) API Application Programming Interface AS Application Server BGCF Breakout Gateway Control Function CAMEL Customised Applications for Mobile Enhanced Logic CSCF Call Session Control Function BICN Bearer Independent Core Network GGSN Gateway GPRS Support Node GPRS General Packet Radio Service GSM Global System for Mobility www. convergencetechnologycenter. org IMS IP IP-CAN ISIM IWF LAN Qo. S RACS RAN SCM SGSN SIP SLA UMTS IP Multimedia Subsystem Internet Protocol IP- Connectivity Access Network IMS Subscriber Identity Module Inter-Working Function Local Area Network Quality of Service Resource and Admission Control Subsystem Radio Access Network Session Control Manager Serving GPRS Support Node Session Initiation Protocol Service Level Agreement Universal Mobile Terrestrial Access 20