Problem Statement Media Independent Handover Signalling draft

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					   Problem Statement: Media
Independent Handover Signalling
   draft-hepworth-mipshop-mih-problem-statement-00


               E. Hepworth, G. Daley,
             S. Sreemanthula, S. Faccin

                   November 2005
      Scope of this discussion
• Related drafts have identified the need for
  mobility services to support media independent
  handover
• MIPSHOP charter proposal is to support these in
  some way
• Not clear how IETF and other bodies should split
  up the overall problem space
• Focus here is on responsibility for common
  protocol aspects rather than details of the
  individual services
Solution Components

 IS            CS             ES              …


            Transaction Semantics


         Common Protocol Functions
      (security, transport, discovery etc.)



                       IP
Possible Deployments
                      Information Exchange

MN                                                            NN
                       Transport over IP




                    Information Exchange

MN                            NN                              NN
      Transport over Other               Transport over IP




      Information Exchange             Information Exchange

                               NN
MN                                                            NN
        Transport over IP
                             (Proxy)     Transport over IP



Wireless Mobile         Access Network,             Somewhere else
    Nodes            including base stations
The value of a common solution
• There is a common core set of                         IS        CS         ES        …
  problems for all the different mobility
  services:                                                  Transaction Semantics

    – All services need to be able to dynamically         Common Protocol Functions
      discover “server” nodes                          (security, transport, discovery etc.)

    – For all services, there is a range of
                                                                        IP
      requirements on the common functionality.
        • e.g. secure or not, reliable or expedited
• Advantages:
    – Provides natural division of responsibility between different
      organisations
    – Prevents solving of same problem incompatibly multiple times
    – Easier to develop and deploy new mobility signalling services
    – Allows possibility to evolve the common part without affecting the
      individual services as you get advances in transport and security
      protocol understanding
     Role of IETF?

IS        CS          ES         …       ?


                                     ?
       Transaction Semantics


     Common Protocol Functions       IETF



                IP
                Summary
• Proposal is to split the problem space into
  generic and service specific parts
  – Does this approach seem feasible?
• If so, which areas would the IETF be
  prepared to consider?
  – Some parts of the problem space may already
    have solutions
  – There will be interactions with other
    standardisation groups
                             Backup
• The common function requirements identified so far include:
   – Discovery: providing the ability to locate nodes that support particular
     mobility services
   – Information from a trusted source: need to ensure that the information is
     trustworthy
   – Low latency: mobility services may want to exchange data with differing
     time sensitivities
   – Reliability: mobility services may want guarantees that information will
     be delivered
   – Congestion control: need to consider head of line blocking etc.
   – Secure delivery: the information may traverse untrusted intermediate
     networks
   – Multiplexing: mobility services may share a single transport
   – Multihoming: possibility that the request response may use different
     links