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Eleanor Hepworth, Srinivas Sreemanthula, Stefano Faccin, Yoshihiro Ohba July 2006

Problem Statement: Media Independent Handover Signalling draft-hepworth-mipshop-mih-problem-statement-02. Eleanor Hepworth, Srinivas Sreemanthula, Stefano Faccin, Yoshihiro Ohba July 2006 IETF#66, Montreal. Contents. The IEEE 802.21/IETF mipshop picture

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Eleanor Hepworth, Srinivas Sreemanthula, Stefano Faccin, Yoshihiro Ohba July 2006

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  1. Problem Statement: Media Independent Handover Signallingdraft-hepworth-mipshop-mih-problem-statement-02 Eleanor Hepworth, Srinivas Sreemanthula, Stefano Faccin, Yoshihiro Ohba July 2006 IETF#66, Montreal

  2. Contents • The IEEE 802.21/IETF mipshop picture • The overall problem and possible approaches to decomposition • Focus of this draft • ‘Transport’ and other common aspects • Basic MIH support functions • What next

  3. An 802.21 Primer • 802.21 covers a varied bunch of stuff • Framework for service continuity (i.e. how to incorporate mobility protocols) • Handover enabling functions (“MIH services”) • SAP definitions for different link layers • The MIH services are control-plane things which provide information which improve the operation of handover algorithms • From the (draft) charter: "MIH services can be delivered through link-layer specific solutions and/or through a "layer 3 or above" protocol. MIPSHOP will define the delivery of information for MIH services for this latter case. Notice that this allows the network information to reside anywhere (not necessarily across the link-layer hop), and enables MIH services even in the absence of the corresponding link-layer support. An L2 or L3 based mechanism to identify a valid information server is also required; in particular for L3, we expect that any of the several current L3 discovery mechanisms will be used." • This discussion is about protocol support for the MIH services

  4. 802.21 and mipshop

  5. Focus of this(*)draft … • … is a strawman problem statement for the mih-support item • Main aspect is common transport part • Status of common header is unclear • Could just be an issue of registry issues for some identifiers carried within ‘transport’ • A solution meeting the goals in the problem statement should be generally useful • Initially for transport of 802.21 MIH services • Possibly other services in the future (*)As compared to the next two drafts, which are about applicability to the specific MIH services (ES/CS/IS) that 802.21 has defined

  6. Basic Protocol Functions • As derived from consideration of the MIH services so far …: • Transport-like functions for moving IEs between the MIH service endpoints • Congestion/flow control, large message support, low-level reliability, multiplexing • Core security functions for moving IEs between the MIH service endpoints • Integrity (including replay) protection, privacy (of identity and other data) • Denial of service mitigation

  7. Components of A Solution Mobility Support Services 2 (e.g. Event Services) Mobility Services Signaling Layer Mobility Support Services 2 (e.g. Information Services) Mobility Support Services 3 (e.g. other) Mobility Services Transport Layer Mobility Service Transport Protocol IP

  8. IEEE 802.21 Transport Requirements The transport protocol must • … work regardless of the network location of the MIH Protocol Entity • … be capable to support both IPv4 and IPv6 versions • … be capable of delivering time- sensitive MIH information • … enable Network address Translation (NAT) traversal for IPv4 networks and enable Firewall pass-through for IPv4 and IPv6 networks • ... allow for more than one MIH Protocol Entity to be discovered at a time

  9. IEEE 802.21 Security Requirements The security mechanism • must provide (through the security mechanisms) a common security association (SA) negotiation method regardless of the network location of the MIH Protocol Entity • must provide (through the security mechanisms) mutual authentication of MIH end nodes • may provide one way authentication of either of MIH end nodes • must provide integrity protection for MIH Protocol exchanges. • may provide confidentiality for the MIH Protocol exchanges • must protect against replay attacks • may protect MIH service entities and discovery resources against denial of service attacks • must not be dependent on the MIH protocol • may provide means to reuse or fast reestablishment the SA due to host mobility.

  10. Other Considerations on the Mobility Service Transport Layer • Congestion Control: transferring of large amounts of data vs. low latency requirements • Multiplexing: support of different mobility services  multiplexing + ability to manage multiple discovery operations and peering relationships in parallel • Multihoming: carrying request/response messages over two different links (e.g. a handover command request on the current link while the response delivered on the new link). Depending on the IP mobility mechanism, there is some impact on the transport option for the mobility information services (including latency and security issues)

  11. Summary / What Next • Draft contains a definition of the problem that mih-support shall solve • This draft is a suggestion from people with 802.21 knowledge • Incorporates requirements officially approved un IEEE 802.21 • Proposal: adopt of PS statement draft for WG draft

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