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Minutes, December 5 2014 interim, 6TiSCH WG
Note: timestamps in PDT.
Connection details
- Webex: https://ciscosales.webex.com/ciscosales/j.php?ED=219615007&UID=481905242&PW=NZTRkNDAwOTE1&RT=MiMyMw%3D%3D
- Etherpad: http://etherpad.tools.ietf.org:9000/p/6tisch?useMonospaceFont=true
- Topic: 6TiSCH Weekly
- Time: 8:00 am, Pacific Daylight Time (San Francisco, GMT-07:00)
- Meeting Number: 206 802 913
- Meeting Password: sixtus
- CCM: +14085256800x206802913
Resources
- Webex recording: https://cisco.webex.com/ciscosales/lsr.php?RCID=89de8783bab243a5afc6eacaf94e1608
- Wiki: https://bitbucket.org/6tisch/meetings/wiki/141205_webex
- Slides: https://bitbucket.org/6tisch/meetings/src/master/141205_webex/slides_141205_webex.ppt
Taking notes (using Etherpad)
- Dominique Barthel
- Thomas Watteyne
- Diego Dujovne
- Michael Richardson
- Pascal Thubert
Present
- Alfredo Grieco
- Deji Chen
- Diego Dujovne
- Dominique Barthel
- Giuseppe Piro
- Guillaume Gaillard
- Malisa Vucinic
- Maria Rita Palattella
- Michael Richardson
- Nicola Accettura
- Pascal Thubert
- Pat Kinney
- Pouria Zand
- Raghuram Sudhaakar
- Sedat Gormus
- Thomas Watteyne
- ? unknown call in user ?
Action Items
- Pascal to announce Last call completion and signal for IESG review process
- Pascal to start LC for the Minimal draft
- Thomas to publish a TSCH draft addressing LC questions
- Thomas to start LC for CoAP draft
- Raghuram to add a disclaimer for the reviewers indicating that the changes may occur in RFC Ed Q due to dependencies on CoMI
Agenda
- Administrivia (2min)
- outcome IETF91 (25min)
- overview (chairs)
- tentative minutes
http://www.ietf.org/mail-archive/web/6tisch/current/msg02753.html
- LC draft-ietf-6tisch-tsch
http://www.ietf.org/mail-archive/web/6tisch/current/msg02759.html
- update draft-ietf-6tisch-minimal
http://www.ietf.org/mail-archive/web/6tisch/current/msg02761.html
- update tools.ietf.org/html/draft-ietf-6tisch-coap
- other next steps
- update IEEE802.15.4-2015 (Pat Kinney, 25min)
- AOB (5min)
Minutes
- [08.05] Meeting starts
- [08.07] Administrivia
- Approval agenda
Agenda approved
- Approval minutes IETF
Minutes of IETF approved. No comments on the call. (Can be changed until Dec 24th)
- Approval agenda
- [08.09] IETF91 Outcome
- Overview
- Discuss drafts
- Last Call for draft-ietf-6tisch-tsch
- Last Called launched last week, 2 comments received.
- consensus reached. Pascal (shepherd) will send to IESG, hopefully before Xmas.
- Thomas will do the change, asap.
- Update / Last Call for draft-ietf-6tisch-minimal
- Concerns about the security text at the IETF meeting. Xavi wrote the changes and published a new version.
- Pascal believes we are ready for last call. No objection on this call.
- Pascal will issue a 2-week Last Call shortly, to end before end-of-year vacations.
- Only question still in the air is NHC vs. ???. Can do an update during IESG discussion. Not blocking for submission, Pascal believes.
- Update / Last Call for draft-ietf-6tisch-coap
- Thomas: this -coap draft and CoMI overlap. CoMI is superset so trying to reference CoMi in the CoAP draft.
- Raghuram: Aligned the CoAP draft with the current version of CoMI; indicating that CoMI will supersede if a discrepancy occurs. Draft presents examples of how CoMI is used
- Thomas: draft is absolutely needed.
- Raghuram: definition of URIs and resources were needed and stable, but the examples are subject to change with CoMI.
- Thomas: are we there yet? Opinions on the call?
- Pascal: what's missing?
- Thomas: was updated yesterday
- Raghuram: payload format not fixed. Only point of contention with CoMI. Does not expect CoMI to change any more.
- Pascal: will stay in Ed. queue anyway, waiting for CoMI, if we list it as a normative reference. Still good to have our doc ready to encourage implementations, we should not keep it on hold.
- Pascal: believes that changes are minor, recommends to do the LC and apply changes per comments received.
- Raghuram: will put in datatracker and do changes.
- Other next steps (architecture & security, terminology)
- 6tisch-architecture draft. Shephard not Thomas or Pascal because co-authored. Michael and René will provide text for the security section. Will Last Call early next year (did I hear this right ????).
- -terminology Michael: security terms text was provided yesterday.
- security will not be discussed in this call because of tight agenda, but rather in the next call TW: two security calls since IETF91. Minutes to come. Will discuss security again at the next 6tisch call.
- Overview
- [08.32] update IEEE802.15.4-2015 (Pat Kinney)
- 15.4 undergoing a revision. Revision using 2011 as a baseline. 7 amendments to be rolled up.
- Hoping for approval mid-august 2015.
- Size reduction - 661 pages to go down. SCrubbing acronyms, definition, bib. Eliminate dup definition.
- Other groups can get assigned numbers. Relevance to 6tisch being discussed.
- IE ID's changed.
- Deleted Terms. More to go.
- Changes to IFS - fixed size
- Changes within TSCH - lot of them. TSCH Terminology harmonized with rest of the standard.
- CSMA-CA flow charts being redrawn to show TSCH. Consistency improved.
- [TW] : [PK] : Mac needs to construct the frame and can be tolerated by PHY.
- CSMA-CA and CCA are focused on coexistence within the same band ONLY.
- longer than 20us, will back off due to IEEE802.11
- Priority mechanism required between different nodes. PCA is the way to do it. Working to get it harmonized.
- Trying to clarify when to use what and how.
- Corrections on the Security area
- Security changes: State machines, frame counters, new frame types, TSCH: removed 5 octet
- Question from Thomas; Answer: Only one size frame counter.
- State machines design under heavy work. Ask for changes if states dissipated.
- nonce generation for TSCH .. not allowing short-addresses in ??? field.
- Short address is not unique: is ambiguous when outside. It can be reused. Thomas: out of scope from 802.15.4 Pat: Yes, from upper layers. Short address inappropriate to be used.
- Thomas: Increment allowed, usage of the ASN avoids tracking when reusing the same short address. Pat: SHort Address can allow the key to be exposed (as a general case)
- Pat: There is a possibility, it must be discussed.
- Pat: Short Address:...
- Thomas: can be
- Thomas: Example: Short Address asked from the node to the PCE
- Michael: Network Wide key.
- Pascal: Bring this to the ML
- Pat goes on. Protocol Implementation Conformance Statement
- Pat: Fast forward on slides.
- Pat: TG4.. q: ultra low power, r: ranging
- 802.15.9: key management, letter ballot
- 802.15.10: layer2 routing
- reflector information to follow.
- [08.55] AOB
- Thomas: Security discussions on 6TiSCH -> state machines
- Pat: Will build a document that can be distributed
- Thomas: PCA tracks? Pat: Simple on the mechanism, tough in the details. 802.15.4k Priority Channel Access. Contention access period. Check for the concepts. 6top must tell the priority of these packets.
- Thomas: Capture effect questions for the next call.
- Thomas: Any other questions for Pat? Go to the ML.
- Next security call on Tuesdays 9-16 December 11AM EST 1300 UTC
- See you on next call.
- [09.03] Meeting ends
Updated