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Introduction

Requirements for vertical handover of multimedia sessions using SIP draft-niccolini-sipping-siphandover-04. Saverio Niccolini (NEC), S. Salsano (Univ. of Rome “Tor Vergata”), H. Izumikawa (KDDI Labs), R. Lillie (Motorola Labs), L. Veltri (Univ. of Parma), Y. Kishi (KDDI Labs). Introduction.

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Introduction

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  1. Requirements for vertical handover of multimedia sessions using SIPdraft-niccolini-sipping-siphandover-04 Saverio Niccolini (NEC), S. Salsano (Univ. of Rome “Tor Vergata”),H. Izumikawa (KDDI Labs), R. Lillie (Motorola Labs),L. Veltri (Univ. of Parma), Y. Kishi (KDDI Labs)

  2. Introduction • Terminal (“Mobile Host”, MH) • Different network interfaces (e.g. WiFi, 3G, WiMax, etc.) connected to different Access Networks (AN) • possibly active at same time • each one with different IP addresses • MH moves, “interface being used” may become not available (or suffering from bad performances, e.g. loss, delays) • MH wants to keep running sessions active (or achieve better performances)

  3. Reference scenario IETF 72 – Dublin – SIPPING

  4. Requirements (the basics) • The handover solution should be as fast as possible • The goal is to provide a "seamless" handover with no perception from the user point of view • The handover solution should not require a support in the different access network (no “network level mobility” e.g. MIP/MIPv6) • The access networks are only required to provide IP connectivity so that mobility support can be rapidly deployable • No special support from Correspondent Hosts (CHs) • CHs should be basic User Agents (UAs) with basic SIP capabilities • If this requirement is not fulfilled there is the need to change all SIP terminals to support the handovers of Mobile Host • The handover solution should be compatible with NATted networks • NAT discovery should not increase the handover delay

  5. Why a new solution? • There are solutions out there, why do you require a new one? • need to be faster • service disruption as small as possible, bound to 0 • do not want to rely on network capabilities • do not want to rely on correspondent host capabilities • need to be NAT-independent • More details in the additional requirements in the draft (here only 15 minutes) • details currently not addressed with available solutions

  6. References (running code?) • Currently two available (independent) “solution” drafts • http://tools.ietf.org/html/draft-salsano-sipping-siphandover-solution-02 • http://tools.ietf.org/html/draft-izumikawa-sipping-sipbicast-01 • The authors of the solution draft teamed up in the requirement draft to define a common set of requirements • Solutions to this problem have been designed and implemented • (At least) 3 (known) independent implementations • NEC Laboratories Europe, University of Rome “Tor Vergata”, KDDI Labs/Motorola • 2 of them tested interoperability already in 2006 • NEC Laboratories University of Rome “Tor Vergata” • Results of implementation and tests on operational networks documented • PIMRC conference, Sept. 2007 • IEEE Wireless Personal Communications, Nov. 2007 • IEEE Wireless Communications, Apr. 2008 • WCNC 2008, April 2008 • Trial with Italian operators

  7. Feedback received and addressed • Differences from Session Mobility ID (draft-shacham-sipping-session-mobility)? • difference in focus: Shacham's I-D is addressing "service mobility", Niccolini and Izumikawa I-Ds are addressing "terminal mobility“ • It is necessary to consider the solution to minimize the service disruption during handoff  explained in the draft • Are there any advantages/merits to perform a terminal mobility using SIP? • ease of deployment, no support needed in all terminals/networks, different roles and utilizations  reflected in the requirements • do you want to wait for an ubiquitous deployment of mobile IPv6 to start using network level mobility keeping your IP address when you roam across networks? • You are fixing some problems with an SBC!!! • solutions based on an intermediate element are promising without the need to rely on Correspondent Host capabilities  reflected in the requirements • anyway this draft does not hint any solutions, it just says current ones are not enough for the requirements • What about media like IM, File Transfer using MSRP? • added additional requirement • Decide which media stream to render when doing bicast • implementation issueout of the scope of SIP/SIPPING?

  8. Conclusions • Do SIPPING folks agree on requirements? • Is the work interesting for SIPPING? • Should this be chartered in SIPPING WG and become a WG item?

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