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Enhancing Mobility Protocols with Local Link Information Conveyance

This draft explores leveraging local link information to enhance transport protocols during handoffs, addressing challenges in adapting to path changes. It highlights the importance of sharing sub-path characteristics for more efficient end-to-end communication.

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Enhancing Mobility Protocols with Local Link Information Conveyance

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  1. Link Characteristics Information conveyancedraft-korhonen-mobopts-link-characteristics-ps-01 Jouni Korhonen, Soohong Park, Ji Zhang, Cheulju Hwang, Pasi Sarolahti

  2. Background • How to make upper layers (e.g. transport) to adapt better after a handoff? Maybe explicit e2e signaling of crosslayer information between communicating peers could be used... • In the IETF#65 we showed some experimental (simulations) results of utilizing local link information as part of TCP Quick-Start during the vertical handoffs • The latest Problem Statement: • draft-korhonen-mobopts-link-characteristics-ps-01

  3. Problem Statement • IP mobility enabling protocols are • Designed to isolate transport and upper layer protocols from the mobility events • Operating on top of the link layer without proper e2e dialogue of the access network characteristics • Sharing the local sub-path characteristic information with the remote communicating nodes is not supported • e.g. the wireless access link is likely the bottleneck on the end-to-end communication path and often represent a significant portion of the end-to-end delay • Transport layer congestion control algorithms often fail to respond fast enough to such changes or react in a wrong way when the path characteristics suddenly change. • Sharing the local sub-path characteristics information allows the remote end to detect and react faster to the significant changes in the end-to-end path properties

  4. Major changes since -00 draft • It was clarified that the last hop & link knowledge is not really enough • The whole path should be considered.. the immediate question is then how to do this based on the ‘local’ sub-path information • Local sub-path changes could serve as an indication to reconsider the path characteristics and in some cases to set known upper limits (e.g. known max RTTs, MTUs, etc) • Not all path characteristic changes are due mobility.. • Definition of the locality is not limited to the first hop • Sub-path can extend beyond local access link.. • Link information monitoring function • Addition of MIH framework suitability considerations • Classification of explicit notification mechanisms • Discussion on possibilities for end-to-end information delivery

  5. Need for e2e Path Info –Current Situation Assumption: All routers on path support wanted feature Data Traffic / Signaling Traffic Routers mark packets or process E2E signaling messages to ensure that Feedback Mechanism using signaling protocol

  6. Use Local Sub-Path Information Assumption: Significant changes in access link / sub-path can initiate feedback mechanism Data Traffic Feedback Mechanism either using protocol specific extentions or a new signaling protocol Use local knowledge about sub-path characteristics R

  7. Discussion Items • Relation to TERNLI? • This work could be one key work area within TERNLI scope? • About information.. • What can be done with 1) local link, 2) sub-path or 3) full path information and how to get that information? • What is actually needed to initiate some further actions? • What data to collect and deliver to the other end? • How to use to link/sub-path information on both ends? • Local use of the sub-path information.. • Various mobility protocols/application layer protocols and their interactions • Generic end-to-end signaling protocol? • Both in-band and out-of-band should be considered

  8. Related (ongoing) work • draft-korhonen-mobopts-delivery-analysis-00 (analysis on e2e information delivery options) • draft-ietf-tsvwg-quickstart-03 • draft- schuetz-tcpm-tcp-rlci-00 • draft-iab-link-indications-04 • RFC 3168 (ECN)

  9. Questions.. Comments?

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