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Minutes Webex 20 September 2013, 6TiSCH group
Note: timestamps in PDT.
Taking notes (using Etherpad)
- Xavi Vilajosana
- Thomas Watteyne
Present (alphabetically)
- Thomas Watteyne
- Pascal Thubert
- Alaeddine Weslati
- Geraldine Texier
- Guillaume Gaillard
- Ken Bannister
- Maria Rita Palattella
- Nicola Accettura
- Pouria Zand
- Qin Wang
- Raghuram Sudhaakar
- Tina Tsou
- Tom Phinney
- Xavi Vilajosana
Recording
- Webex recording (audio+slides,streaming)
- https://cisco.webex.com/ciscosales/lsr.php?AT=pb&SP=MC&rID=71580842&rKey=c5bf8edd4d83ae2e [62min]
Slides
- slides_130920_webex.ppt: slides shared during the call
Agenda
- Administrivia [4min]
- Approval agenda
- Approval minutes last call
- WG news
- Preparing for Vancouver [10min]
- Updates to "minimal" draft [10min]
- Need for hysteresis in using RPL OF0 [15min]
- RFC6719
- Scoping of Work Item 2 [20min]
- Examples report traffic
- Ideas for scope and discussion
- AOB [1min]
Minutes
- [08.05] Meeting starts
- [Thomas] The group is at an interesting point. We have had many discussions. With 6 weeks left before Vancouver, good time to consolidate discussions in drafts.
- [08.05] Administrivia [4min]
- Approval agenda
Xavi proposes to move his presentation on draft minimal at the end if time permits, or to next week. Change accepted.
- Approval minutes last call
No concerns raised on the call. Minutes approved.
- WG news
- Charting process in "External review" step. Scheduled for discussion by IESG on 09/26/2013 telechat.
- Requested a 90min meeting slot during IETF 88 in Vancouver.
- Approval agenda
- [08.10] Preparing for Vancouver [10min]
- 6 weeks left to IETF 88
- Main objective for Vancouver: have documents ready for WG adoption
- Charter items: minimal, architecture, models
- Others (TSCH, terminlogy)
- Show activity on other drafts (security, 6top)
- [Pascal] Volunteers for information and data models draft(s)?
- [Qin] Difference between information and data model?
- [Pascal] See http://tools.ietf.org/html/rfc3444. "Information model" is abstract description of interactinos, "data model" is very concrete (bits-and-bytes).
Raghuram and Pouria volunteer. Xavi happy to help review, but not author. Thomas happy to help define problems statement and follow process, but not author.
- [Pascal] Thanks. You will need to elect one editor.
- Second objective for Vancouver: informal interop and mini-demo
- Objectives
- informal
- show implementations related to 6TiSCH
- discuss implementation details
- at the very best, show some interop of different implementations of the minimal draft
- We might need to ask for a room?
- [Thomas] It would be good to document goals and methods in a "implementers guide" draft.
Xavi volunteers to participate.
- [Pascal] Interop or demo? We might want invite IAB members to come take a look.
- [Thomas] This is very early on, so let's not announce it as an official interop.
- Objectives
- Updates to "minimal" draft [10min]
Pushed to end of call, or next week.
- Need for hysteresis in using RPL OF0 [15min]
- See http://tools.ietf.org/html/rfc6719
- Requirement of pass a value boundary on rank in order to change parent (to avoid Hysteresis)
- Experiment with other techniques:
- stability counter.
- delta threshold.
- [Xavi] Should we add this to the minimal draft?
- [Pascal] We could keep RFC6719 in minimal, use experiment to decide on hysteresis, and maybe push to ROLL in the future
- [Pascal] Per the charter, at the end, our interest is to produce a recommendation
- [08.34] Scoping of Work Item 2 [20min]
- Intro [Thomas]
- Thanks to volunteers to contribute to document
- We need to scope work item 2 clearly. FYI, charter states:
Produce an Information Model containing the management requirements of a 6TiSCH node. This includes describing how an entity can manage the TSCH schedule on a 6TiSCH node, and query timeslot information from that node. A data model mapping for an existing protocol (such as Concise Binary Object Representation (CBOR) over the Constrained Application Protocol (CoAP)) will be provided.
- Start with presentationof example report flows by Pouria, followed by discussion
- Examples report traffic [Pouria]
- Pouria presents report traffic flow examples
- ISA100.11a
- Services to read/write/execute
- interesting objects: candidates, neighbors, neighborDiag, channelDiag, alertPolicy
- WirelessHART
- metrics: device, neighbor, signal levels
- Discussion/Questions
- [Xavi] Do we want to focus our work in the same way as ISA/WirelessHART which is closed and restricted to a set of parameters, or rather go to a more open mechanism.
- [Thomas] +1. Our goal is not to replicate ISA/WirelessHART. Information Pouria presented is an example, we want to make sure the mechanism we design support this type of interaction. We're looking for "outlier" type of interaction the CoAP-based solution we are designing might not cover.
- [Thomas] Pouria, from this exercise, have you seen any type of interaction that CoAP might not be able to deal with?
- [Pouria] A priori, it seems feasible to use CoAP. Although we need a more detailed investigation on CoAP.
- [Raghuram] Extensibility is important, we need to come up with just the base of of commands and functionality we need, and allow for extensions.
- [Qin] Clarifying question: Pouria's presentation did not touch on action and request flows. Do those not exist?
- [Pouria] The application layer services include "execute", which can be mapped to the action flow we identified.
- [Thomas] Let's not forget the decentralized case.
- toward CoAP mapping [Thomas]
- Important questions to answer for work item 2. CoAP related. These are just examples, but something like that could be answered by work item 2 draft.
- What is the URI scheme going to look like?
- possible example:
coap://6t/
to access 6TiSCH resource
- possible example:
- How to map methods?
- possible example:
PUT coap://6t/c/
to add a cell
- possible example:
- How to allow extensions?
- possible example: use profiles.
GET coap://6t/p/
to access list
- possible example: use profiles.
- Intro [Thomas]
- [09.07] AOB [1min]
Qin and Maria Rita volunteer to contribute to the information model as well.
- [09.08] Meeting ends
Updated