Wiki
Clone wikimeetings / 130215_webex
Minutes Webex 15 February 2013, 6TSCH group
Note: timestamps in PST.
Present (alphabetically)
- Alfredo Grieco
- Gennaro Boggia
- Marc Blanchet
- Normann Finn
- Pascal Thubert
- Qin Wang
- Raghuram Sudhaakar
- Robert Assimiti
- Sateesh Addepalli
- Thomas Watteyne
- Tina Tsou
- Tom Phinney
- Xavier Vilajosana
Agenda
- [10min] Status/Discussion on draft-watteyne-6tsch-tsch-lln-context
- [10min] Other potential early drafts, examples:
- the 'sublayer' specification (Qin, Xavi, others?)
- overall architecture document (Pascal, others?)
- [30min] Preparing for the bar BOF;
- [5min] agree on date (Tuesday or Wednesday noon). 5min
- [10min] bar BOF goals (sponsor?).
- [15min] List goals, scope, dependencies (liaisons) for a 6TSCH group
- [time permitting] misc topics based on ML discussions.
Minutes
Meeting starts at 09.05 PST
- Status/Discussion on draft-watteyne-6tsch-tsch-lln-context
- [Pascal] asks for status and update
- [Thomas] 3 open issues on draft:
- stressing requirements on security in section 3.1 (joining)
- adding text on deterministic networks
- extract gotcha: two ways of synchronizing
- Other potential early drafts
- [Pascal] Pascal to start architecture draft
- [Pascal] second draft about sublayer, started by Qin and Xavi
- [Normann] Offers to give a quick overview of work on deterministic
Ethernet in 802.1 IEEE group.
- Topology is not spanning tree, but rather IS-IS used to run the network
- BW reservation scheme
- time sync scheme based on 1588
- already work with the 802.11 group to have 802.11 appear as "just another medium", possibly to be used with wireless meshes of APs.
- Time scheduled transmission
- Preempting transmission with higher priority frame (not applicable to wireless).
- working group used to be called Audio Vdeo Group (AVG), name changed to Time Sensitive Networks (TSN)
- Interested in QoS, especially l3/l2 interaction.
- Preparing for the bar BOF
- [Pascal] We have a draw between Tuesday and Wednesday noon for bar-Bof.
- [Pascal] Let's hold it on Tuesday, so we can have an extra session of Wednesday noon if needed.
- [Thomas] Allows us to be right after ROLL.
- Pascal to e-mail ADs (in particular Ralph) to ask for room
- [Pascal] Would Marc agree to helf 6tsch group out to run the bar BoF and
prepare for a successful BoF?
- [Marc] Yes.
- [Pascal] We have 1.5h during bar-BoF. We should try not to dwell too much
on technical issues, but rather discuss:
- goals.
- scope.
- dependencies.
- [Thomas] Let's publicize in ROLL
- [Marc] we should use same room as ROLL, since meeting right after
- [Thomas] We can use draft-watteyne-6tsch-tsch-lln-context to list goals.
- misc topics based on ML discussions
- [Thomas] Synchronization:
- [Thomas] There are two mechanisms: EB and KA messages.
- [Robert] EB can be used exclusively. Using EBs consumes less power than KA.
- [Thomas] Let's discuss this on ML.
- [Thomas] Using time rather than ASN:
- [Tom] Don't want per se to discuss this in 6tsch context, we can carry on using ASN.
- [Robert] It's an important discussion to have. Problems comes up in 802.15.4g where multiple modulation/datarate settings cause packet to be very different. If deriving slot length from worst case packet length, this results in lots of bandwidth waste.
- [Robert] Can be done with extra IE.
- [Thomas] Let's "keep an eye open" for cases where switching between ASN and time poses a problem, and maybe write up a document which explains how to do so later.
- [Robert] Agreed.
- [Tom] Agreed.
- [Pascal] new "shim" layer draft.
- [Pascal] this draft needs to contain:
- the API towards IP
- the API towards the existing TSCH
- some text about the data flows
- [Qin] Have started working on it. Will take those changes into account.
- [Xavi] Agreed. Will work on the draft in the coming week.
- [Pascal] this draft needs to contain:
- [Thomas] Synchronization:
Meeting ends at 10.05 PST
Updated