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TCP Response to Lower-Layer Connectivity-Change Indications draft-schuetz-tcpm-tcp-rlci-01

TCP Response to Lower-Layer Connectivity-Change Indications draft-schuetz-tcpm-tcp-rlci-01. Simon Schuetz NEC Lars Eggert Nokia Wesley Eddy Verizon Yogesh Swami, Khiem Le Nokia. Problem to Solve and Basic Idea.

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TCP Response to Lower-Layer Connectivity-Change Indications draft-schuetz-tcpm-tcp-rlci-01

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  1. TCP Response to Lower-Layer Connectivity-Change Indications draft-schuetz-tcpm-tcp-rlci-01 Simon Schuetz NEC Lars Eggert Nokia Wesley Eddy Verizon Yogesh Swami, Khiem Le Nokia IETF-68, Prague, Czech Republic

  2. Problem to Solve and Basic Idea • TCP is (mainly) unaware of events in lower layers  can be inefficient in case of mobility and/or temporary connectivity disruptions • RLCI • uses generic (technology-independent) indications from lower-layers (“something happened”) • avoids long idle time due to (repetitive) RTOs • re-probes path state to adapt faster to changed conditions • signals local indications to peer hosts through a new TCP option IETF-68, Prague, Czech Republic

  3. Why RLCI at TCPM? • RLCI provides generic approach to overcome problems in diverse networking scenarios • handovers • adapt faster to new paths • friendlier: avoid over-loading new path • performance: quickly use available capacity • connectivity disruptions • Increase performance and responsiveness IETF-68, Prague, Czech Republic

  4. What’s new? • -00 version was presented at IETF-66 • cleaned up description of connectivity-change indication processing • specification more formal • developed preliminary NS-2 prototype • first simulation results look promising • repeated “long disruption” scenarios from Simon’s and Lars’ CCR paper on retransmit-now mechanism* • got similar (good) results on performance improvements • final simulation results will be made available * Protocol Enhancements for Intermittently Connected Hosts. Simon Schütz, Lars Eggert, Stefan Schmid and Marcus Brunner. ACM Computer Communication Review (CCR), Vol. 35, No. 3, July 2005, pp. 5-18. IETF-68, Prague, Czech Republic

  5. Next Steps • Would like to start discussion on mailing list • Is the problem considered worth being followed up? • Is the RLCI approach the right way to go? • Are there technical issues with current draft? • Simulation results should be made available as soon as possible • Consider it as candidate for Experimental RFC IETF-68, Prague, Czech Republic

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