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Minutes Webex 06 December 2013, 6TiSCH WG
Note: timestamps in PST.
Taking notes (using Etherpad)
- Xavi Vilajosana
- Pascal Thubert
- Thomas Watteyne
Present (alphabetically)
- Alaeddine Weslati
- Cedric Adjih
- Diego Dujovne
- Giuseppe Piro
- Kuor Hsin Chang
- Maria Rita Palattella
- Nicola Accettura
- Pascal Thubert
- Pat Kinney
- Patrick Wetterwald
- Pouria Zand
- Raghuram Sudhaakar
- Thomas Watteyne
- Xavi Vilajosana
Recording
- Webex recording (audio+slides,streaming)
- https://cisco.webex.com/ciscosales/lsr.php?AT=pb&SP=MC&rID=73615482&rKey=86552e76974c7216 [63min]
Slides
- slides_131206_webex.ppt: slides shared during the call
Action Items
- Pascal to published proposed milestones to ML.
- Thomas to create new repository for 6top interface draft on bitbucket.
- Thomas to continue discussion about need for 6LoWPAN context management for 6top on ML.
Agenda
- Administrivia [2min]
- Approval agenda
- Approval minutes last call
- 6TiSCH Milestones [15min]
- Proposal
- Discussion
- Status WG docs [5min]
- architecture changes
- 6top split
- 6LoWPAN context
- YANG example [15min]
- OTF draft [15min]
- PRMA paper [5min]
- AOB [3min]
Minutes
- [08.04] Meeting starts
- [08.05] Administrivia
- Note well, IPR, etc.
- IETF89 registration open. Hotel prices are very high, Pascal to ask IETF whether no negotiated prices.
- [Thomas] cannot take notes in Etherpad due to connectivity issues.
- Approval agenda
No issues raised. Agenda approved.
- Approval minutes last call
No issues raised. Minutes approved.
- 6TiSCH Milestones
- Proposal
- 12/2013 – WG to adopt 6TiSCH terminology
- 12/2013 – WG to adopt IEEE802.15.4e TSCH overview
- 12/2013 – WG to adopt 6TiSCH architecture
- 12/2013 – WG to adopt 6TiSCH minimal configuration
- 04/2014 – WG to adopt 6top draft(s)
- 04/2014 – WG to adopt 6TiSCH data model for CoAP
- 11/2014 – Submit first draft of 6TiSCH minimal configuration to the IESG
- 11/2014 – Submit first draft of 6top draft(s) to the IESG
- 11/2014 – Submit first draft of 6TiSCH data model for CoAP to the IESG
- 12/2014 – Submit first draft of 6TiSCH terminology to the IESG
- 12/2014 – Submit first draft of 6TiSCH architecture to the IESG
- 12/2014 – Evaluate WG progress, propose new charter to the IESG
- Discussion
- milestones of the WG presented together with the charter.
Action item: Pascal to published proposal to ML.
- work for minimal + yang models are doable within this year.
- expect to adopt the 6top and 6tisch data model after IETF in London
- submit the drafts of this group to the IESG by november.
- december 2014 terminology,etc..
- december 2014 proposal to recharter to the IESG
- [Xavi] 6top ready for IESG submissino by 11/2014 could be hard. Risks are:
- mapping to 15.4e may take time
- as we progress work on dynamic scheduling, 6top interface might evolve
- milestones of the WG presented together with the charter.
- Proposal
- Status WG docs
- architecture changes
- JP will probably add some intro text to upcoming PCE-related work
- goal is to support recharter in december
- [Thomas] Why the term TCP?
- [Pascal] Because JP will probably highlight problems of PCEP supporting only TCP.
- Proposed changes to architecture draft:
- suboptimal operation depending on the schedule
- 6top can modify bundle sizes but cannot indicate that this is a local decision, or not.
- describe chunk allocation scheme
- describe more-follows and need-more bits
- 6top split
- Qin/Xavi agreed to split doc in two
Action item: Thomas to create new repository for 6top interface draft on bitbucket.
- 6top interface
- list of commands
- mapping to YANG data model
- 6top sublayer specification
- monitoring process
- 6top to 6top protocol
- IE formats
- Qin/Xavi agreed to split doc in two
- 6LoWPAN context
- [Thomas] How do we distribute the context? Do we want to use 6top to distribute it
Action item: Thomas to continue discussion about need for 6LoWPAN context management for 6top on ML.
- [Xavi] What can you place on a context?
- [Thomas] very flexible
- Use contexts to reduce number of some bytes in packets. Use contexts to compress groups of addresses.
- [Thomas] As we are defining a set of elements in the YANG model, we could add the ability to install contexts.
- [Kuor Hsin] will people use it?
- [Thomas] yes, I have encountered it.
- [Pascal] We expect a way to agree implicitly about the contexts because if not it can break. Having to distribute context information requires coordination.
- [Thomas] How do we distribute the context? Do we want to use 6top to distribute it
- architecture changes
- [08.42] YANG example
- http://tools.ietf.org/pdf/draft-ietf-netmod-iana-timezones-03.pdf
- C-style syntax, organized in blocks. Tree diagram showing hierarchy.
- [Thomas] Doesn't look like too much work to express 6top interface in YANG.
- [Raghuram] Agreed.
- [08.47] OTF draft
- http://tools.ietf.org/html/draft-dujovne-6tisch-on-the-fly-00
- https://bitbucket.org/6tisch/draft-dujovne-6tisch-on-the-fly
- published today
- Addressed ML comments on bundles, discuss allocation policies, which metrics are used.
- Bundle size is over provisioned for peak policy vs. dynamic allocation policy
- [Diego] 6top manages the bundle size. If 6top changes bundle size, what will happen with OTF.
- [Pascal] 6top knows how to do it, but OTF decides when.
- [Diego] Need to define terms more precisely (e.g. reserve which is somewhere in between allocation and schedule)
- [Thomas] 6top is providing statistics and other layers make decisions, e.g. OTF makes decision.
- [Thomas] I don't think we want 6top to take decisions. 6top only provides statistics and commands. OTF is the component which decides when to resize a bundle.
- [Pascal] bundle is the BW between 2 routers. 6top does not make the decision.
- [09.00] PRMA paper
- http://www.ietf.org/mail-archive/web/6tisch/current/msg01598.html
- http://www.ietf.org/mail-archive/web/6tisch/current/msg01612.html
D.J. Goodman, R.A. Valenzuela, K.T. Gayliard, B. Ramamurthi. Packet Reservation Multiple Access for Local Wireless Communications. IEEE Trans. on Communication, vol. 37, no. 8, 1989
- recommended by Prof. Adam Wolisz
- [Thomas] core idea is simple: contention with arbitration by the AP. Stop talking means returning the slot to the "available" heap.
- [Thomas] Nice through simplicity. Direct applicability to 6TiSCH has challenges:
- expecting that the AP coordinates everything packet may not play well in multi-hop scenario
- a node needs to overhear and thus stay awake all the time to get all the ACKs
- Concepts are applicable to 6TiSCH. Piggybacking information in the ACKs is similar to using a "more bit". A parent grants its slots to its children it is very close ideas to what we do.
- [09.06] AOB
No other business raised.
- [09.06] Meeting ends.
Updated