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Minutes Webex 22 February 2013, 6TSCH group

Note: timestamps in PST.

Present (alphabetically)

  1. Alfredo Grieco
  2. Dominique Barthel
  3. Kris Pister
  4. Maria Rita Palatella
  5. Michael Richarson
  6. Normann Finn
  7. Pascal Thubert
  8. Qin Wang
  9. Raghuram Sudhaakar
  10. Robert Assimiti
  11. Shitanshu Shah
  12. Tina Tsou
  13. Thomas Watteyne
  14. Tom Phinney
  15. Xavi Vilajosana


  • Status on Orlando meetings [5min]
  • Update on
    • presentation changes
    • discussion on the draft
  • time sync. [20min]
    • Summary of last week discussion. Talk on the multiroot case (over a shared backbone). Also, start discussing a model if the backbone is 802.1 TSN deterministic ethernet.
  • Drafts to come.
    • Archi [Pascal] [10min]
      • TOC
      • authors
    • 6tus [Qin, Xavi] [10min]
      • TOC
      • authors

Minutes: [09.07] meeting starts Orlando meeting update [Pascal] * bar BoF evolves into official meeting. We are going to have a working meeting. We are already starting the work. Meeting will look like a normal meeting. We can organize it as a conference. Open discussion, but progress on items. * Same meeting time on Tuesday and Wednesday, over lunch. Pascal tries to arrange for pizzas. * Tuesday: prepare for BoF * Wednesday: present drafts, open technical discussion. Update LLN draft [Thomas] * presentation of changes * request to send comments Synchronization * If there are multiple DAG roots in the network, should they be synchronized? * consenus on the call. Motion adopted. [09.24] 802.1 and TSN [Normann] * [Pascal] Goal: * IP abstraction the same across wireless and wired network * consistent with Ethernet semantics * [Normann] * slides highlight what WG is doing in the WiFi space. Active in 802.1, and WiFi * 802 is "Ethernet". 802.1 is "higher layers", bridging an up. WG was called "audio video task group", now called TSN. * define a profile of IEEE1588. IEEE1588 is a toolbox, which can provide time sync donw to 1us. Work in 802.11 to support time sync; maybe not 1us, but some sync. * Scheduled queuing. based on clock sync, you can set up so that queues on a bridge can be tied to a time-of-day schedule. E.g., schedule a certain class of service with 0 jitter at some part of the day. * 802.1 interworking standard. Idea is not to in spanning trees, but use IS-IS to help build schedule. Lots of interop demos. Every frame takes the least-cost path through the network. Two modes: * MAC-in-MAC * 802.1Qbz to put WiFi in middle of network, not on edge. AP is a bridge, not an intermediate. WiFi stations can be interconnected by a combination of wireless and wires. * one of characteristics of a bridged topology control protocols is that it operates per VLAN. Some VLANs can be under control of RPL. * Clarifying questions. * [Pascal] how can time/schedules pass across boundary between 802.15.4 and TSN world? * [Michael] Could IS-IS express some ETX (or other metric)? * [Thomas] We need to discuss 802.1 more, maybe at Orlando. * [Normann] Maybe will attend Tuesday meetings. [09.50] Presentation of 6tus adaptation layer [Xavi, Qin] * present slides * [Thomas] will get slot in Wednesday Orlando meeting to discuss this [10.10]* meeting ends