Mobile Computing #MC05 Internet Protocol and Mobile Computing
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1 Mobile Computing #MC05 Internet Protocol and Mobile Computing CS60002: Distributed Systems Winter
2 Where we left off... Device databases Flash, OR/direct Synchronization Algorithms Push/notifications Scale to MM Handheld design CPU, RTOS, battery Core Mobile Apps /IM, PDA,browse IP Protocols IMS, SIMPLE/XMPP Broadcast Algorithms Device Management Software & Config
3 Today Device databases Flash, OR/direct Synchronization Algorithms Push/notifications Scale to MM Handheld design CPU, RTOS, battery Core Mobile Apps /IM, PDA,browse IP Protocols IMS, SIMPLE/XMPP Broadcast Algorithms Device Management Software & Config
4 Agenda SIP Overview Session Initiation Protocol IMS Overview IP Multimedia Subsystem IMS Details Review Whitepaper Reading Assignment More IMS
5 What is SIP? Session Initiation Protocol Signaling protocol (very limited data e.g., vcard) Establishes IP+port used to send/receive data Hands session over to transport protocol (e.g. RTP) SIP Services User location Call set-up User availability User capabilities
6 Example SIP Session
7 SIP Features User Mobility sip: Call control Manual and automatic redirection Split/fork a call Reply with alternative media Customization (ringtone, spam, callerid,..)
8 SIP Server Roles Proxy Point of contact. Authentication. Tracking/presence. Gateway Bridge with foreign networks (PSTN, SIP,..) Registrar User profiles, preferences and capabilities Redirector Forward or split/fork calls
9 Optional reading exercises RFC 3261 Alcatel Whitepaper Session Initiation Protocol
10 What is IMS? Set of specifications Defined by 3GPP in R5 Part of transition from 2G to 3G networks (2002) Extensive Voice, video, data, presence Networks, operators, billing Not just GSM 3GPP R5 covers GPRS and UMTS 3GPP2 based MMD for CDMA2000 on IMS 3GPP added WLAN in R6
11 IMS Architecture Device Layer Computers, GSM+GPRS, POT and IP Phones, Settop boxes,.. Transport Layer Connects IP devices as well as GSM and POT Control Layer Manages sessions and profiles Service Layer Multimedia application services
12 IMS Architecture Device Transport Control Service WiFi SIP GPRS DSL IP Network HSS Diameter IM Service Presence Service CSCF SIP Group Service PSTN Gateway Other Services
13 Home Subscriber Server Database of user profiles Performs authentication and authorization Stores subscription-related information Stores dynamic information about user's location Similar to HLR and AUC in GSM Profile downloaded to CSCF on registration Multiple HSS on same domain SLF: Subscriber Location Function
14 Call Session Control Function (CSCF) Proxy or P-CSCF First contact point (DHCP or PDP Context) In visited network or in home network Authentication, IPSec, Compression Serving or S-CSCF Always in home network. Manages profiles at HSS. Connects to Application Services. Enforces policies. Interrogating or I-CSCF At edge of admin domains. Forwards SIP packets.
15 Application Servers Applications implemented on the Control Layer Interface uses SIP Three core servers Presence Server Group List Management Server Instant Messaging Server Custom application servers Often use vendor and domain-specific APIs
16 Reading Assignment Introduction to IMS Ericsson, March 2007 PDF at course website. Please be sure to read all of Section 4
17 Pros and Cons of IMS Open architecture for IP-based services Links packet-switched & circuit-switched networks Connects multiple fixed and wireless networks Uniform presence-and-availability Highly distributed and extensible Carrier/operator-centric 3GPP is not IETF! Legacy makes IMS complex Leaves room for competing standards
18 Optional Reading Assignment Services in the IMS ecosystem Ericsson, February 2007 PDF at course website. Discusses current and future IMS applications
19 SIP Recap Session Initiation Protocol IETF RFC 3261 Reading assignement IMS RFC and Alcatel WP (optional) IP Multimedia Subsystem Vast system of 3GPP protocols and standards Reading assignment Ericsson WP: Intro to IMS Ericsson WP: Services in the IMS ecosystem (optional)
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