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Jan 29, 2024 •244 likes •372 views

Outline 3GPP: IMS 3GPP Evolution (IP Multimedia Subsystem) SIP Architecture Mobility Management SIP and 3G Networks Eric Wu 2012 National Central University Department of Computer Science and Information Engineering Department

  1. Outline 3GPP: IMS  3GPP Evolution (IP Multimedia Subsystem)  SIP Architecture  Mobility Management  SIP and 3G Networks Eric Wu 2012 National Central University Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 1 2 TDMA, CDMA, OFDMA HSPA+, LTE Possible Peak Downlink Rate Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 3 4 MIMO Mobile Multicast/Broadcast TV Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 5 6 1

  2. 3GPP Release GPRS/EDGE Data Infrastructure R8 R9 R10 R99 R4 R5 R6 R7 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 HSPA UMTS HSPA HSPA LTE LTE Adv DL UL + EPC Common MMTel IMS IMS Releases cover the areas of: . Accesses (GSM, EDGE, HSPA, UMTS, LTE, LTE-Advanced, etc.) . Core Network (GSM Core, EPC) . Services (IMS, MMTel) Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 7 8 UMTS Voice and Data Traffic Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 9 10 Flat Architecture (Release 7-> 8) EPC (Evolved-Packet Core) Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 11 12 2

  3. IMS-IP Multimedia Subsystem IMS: IP Multimedia Subsystem Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 13 14 Session Initiation Protocol (SIP) MMTel (Multimedia Telephony) Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 15 16 Microsoft Voice .NET Services Session Initiation Protocol  SIP is originally proposed by Columbia University Internet Telephony and is specified by IETF. Service Provider (ITSP)  SIP is an end-to-end application-layer protocol  Establish, modify and terminate interactive multimedia sessions, e.g., VoIP and video conference, between SIP- based users.  Signaling protocol.  Client-Server framework.  H.323 is a alternative signaling protocol to support VoIP. Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 17 18 3

  4. Features of SIP H.323  Text-based  Easy implementation in Java or Perl  JSIP open source library  Easy debugging  Flexible and extensible  Less signaling comparing to H.323  QoS  Transport-layer independence  UDP is commonly used.  Forking a call request  Call forwarding  Parallel rings at different places Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 19 20 Four SIP Logical Entities  Introduction to SIP  SIP Architecture  User agent  Mobility management  Proxy Server  SIP and 3G Networks  Registrar  Redirect Server Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 21 22 User Agent Type of SIP Servers  User applications  Proxy Server  Both software and hardware  Application layer router used to relay SIP messages.  Registrar  Accept registration request from user agent.  Redirect Server  Redirects caller to other servers. Typically, “ SIP server ” implements the functionality of Proxy, Registrar and Redirect Servers. Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 23 24 4

  5. SIP Addressing SIP messages  SIP give you a globally reachable address.  Email-like address.  sip: leonard@a.ntu.edu.tw Request Line  sip: 82828888@a.ntu.edu.tw  User agents bind this address to Registrar by using SIP REGISTER message.  Each user agent communicates with one another by using this address. Status Line Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 25 26 Example: SIP Registration Example: Session Establishment Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 27 28 Routing Information Example: Session Forwarding Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 29 30 5

  6. Session Description Protocol (SDP) RTP, RTCP, and RTSP  The message body of SIP  Real Time Transport Protocol (RTP)  Encode and decode media stream  SDP is used to describe a multimedia  Recover the possible loss and jitter session  Real Time Control Protocol (RTCP)  QoS feedback  …  Real Time Streaming Protocol (RTSP)  Control stored media  VCR remote control  Support play, record , pause, fast forward, and etc. Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 31 32 RTSP protocol session SIP Interworking with the SS7 Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 33 34 Wireless Technologies Convergence  Introduction to SIP  SIP Architecture  Mobility management  SIP and 3G Networks Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 35 36 6

  7. Mobility Management Mobile IPv4: Registration Example Movement  Mobility Classification MH visits a foreign link  Roaming Mobile IP kicks in MH is at home Home address: 2.0.0.3 Internet Mobile IP is not used  Macro-mobility Care-of-address: 1.0.2.4 Home address: 2.0.0.3  Domain mobility Foreign Home 2.0.0.3 2.0.0.3  Micro-mobility Agent Agent Tunnel 2.0.0  Subnet mobility Foreign Link Home Link  Solutions Foreign  Network layer solution: Mobile IP Agent Foreign Link  Application layer solution: SIP Correspondent Host Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 37 38 Mobile IPv4: CH-to-MH Routing Mobile IPv4: MH-to-CH Routing Example Example MH visits a foreign link MH visits a foreign link Mobile IP kicks in Mobile IP kicks in Router Home address: 2.0.0.3 Home address: 2.0.0.3 Internet Infrastructure Care-of-address: 1.0.2.4 Care-of-address: 1.0.2.4 2.0.0.3 Foreign Foreign Home 2.0.0.3 Home Agent Agent Agent Agent Tunnel Tunnel 2.0.0 2.0.0 Foreign Link Home Link Foreign Link Home Link Foreign Foreign Agent Agent Foreign Link Foreign Link Correspondent Correspondent Host Host Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 39 40 Mobile IPv4 Mobile IPv6: Binding Update  Triangle route problem  Micro-mobility improvement  Cellular IP, Campbell in Column University.  Regional Registration, Perkins, Nokia Center.  … Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 41 42 7

  8. Application Layer Mobility Using SIP Terminal Mobility  Terminal Mobility  Session Mobility Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 43 44 Terminal Mobility Session Mobility  Allow a user to maintain a media session even while changing terminals. Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 45 46 Comparison  Introduction to SIP  SIP Architecture  Internetworking  Mobility management  SIP and 3G Networks Department of Computer Science and Information Engineering Department of Computer Science and Information Engineering 47 48 8

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