## DRAFT ##

# Minutes, 17 March 2017 interim, 6TiSCH WG #

Note: timestamps in PDT.

Connection details
------------------

* Date: 7-8am Pacific: http://www.worldtimebuddy.com/?qm=1&lid=100,12,5392171,1850147&h=100&date=2017-03-17&sln=14-15
* Webex link: https://cisco.webex.com/ciscosales/j.php?MTID=mcdbbe3a4e38d97d986b507ec12a1f9b1
* Webex Recording: https://cisco.webex.com/ciscosales/lsr.php?RCID=83818f25e86144849f121e60e49bd090
    * Recording password: SveKaRy7 
* Material link: https://bitbucket.org/6tisch/meetings/raw/master/170317_webex/slides_170317_webex.ppt

Taking notes _(using Etherpad)_
-------------------------------

1. Xavi Vilajosana
1. Michael Richardson
1. Pascal Thubert

Present _(alphabetically)_
--------------------------

1. Tengfei Chang
1. Pascal Thubert
1. Michael Richardson
1. Diego Dujovne
1. Xavi Vilajosana
1. Sedat Gormus


Action Items
------------

1. Michael to send feedback on security piece of the agenda

Agenda
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* Administrivia [2min]
    * Approval agenda 
    * Approval minutes last call
* Status of drafts [Pascal] [5min]
* Update on security [Michael] [15min]
* Update on 6P [Xavi] [10min]
* Update on SF0 [Diego] [10min]
* Preparation for IETF 98[Pascal] [QS]
* AOB [3min]

Minutes
-------


started 10:07.

* Administrivia [2min]
    * Approval agenda 
    * Approval minutes last call

Note well. Reminder.

    
* Status of drafts [Pascal] [5min]

    * 6tisch-minimal-21 status, email sent to Tero to confirm that he is happy. No reply yet (Tero AFK).
    * no other hangups in status yet. Expect draft to advance during the meeting.
    
* Update on security [Michael] [15min]
    
    * Major change is that there are more documents:
        - created another version of EDHOC-OSCOAP called EALS 
        - tries to do secure transport 
        - zero touch security within the EDHOC protocol
        - question is how the WG will articulate the JRC centraly driven.
        - Devices do not need to stay awake the whole time. They need to listen for traffic for them.
        - Shared schedule is used for everybody to join (e.g minimal). 
        - having indication on how long it should wait the JN.
        - trade-off between energy consumption and energy congestion during the joining phase. This is related on how long a JN has to wait to be authenticated.
        - GOAL: figure out the compromise between energy and congestion.
        
* Update on 6P [Xavi] [10min]
    * finalize the missing pieces: reordering of the text, remove duplicated text.
    * refine section 4, define first the headers, and then the details.
    * renamed status to count now that we can allocate ny type of cell
    * removed xcell suggestion that was complex
    * structure now ready. plan for last call at the meeting
    * will do a pass and on Monday of the IETF will publish and ask for feed back
        
* Update on SF0 [Diego] [10min]
  * some changes to summarize the changes since last IETF.
  * Cell Estimation Algorithm, three alternatives. 
  * picked alternative 3, most accurate to what people have implemented.
  * Xavi:  what about churn because the application has a cycle different than the slot frame.
  * Xavi: what if 3 time slots needed every 2 slot frames, or if I have bursts, many needed in one slotframe and none at the next. Need mechanism to avoid continuous re-scheduling
  * SF0 has a hystersis so that it does not deallocate until the need is below a *lower* threshold.
  * Diego: Added PDR computation. Need to discuss Timeout calculation, requires 6P collaboration.
    
   * Requires 6P collaboration. 
   *  
* Preparation for IETF 98[Pascal] [QS]

    * security questions: 
    * do we need centralized control over enrollment to avoid congestion in the network?
    * can we give a (secured?) hint to nodes waiting to be contacted as to how long to sleep?
    * do we want to use EALS to do vouchers within the key agreement protocol? (round trips vs size of packets)
    * CoMI for management of rekeying
    * Do we need K1 and K2? Or just one key set?
    * open issues with pledge initiated version
    * 
    * 6P/SF0 ask for Last call.  
    * 
    *
    *    
    
* AOB [3min]

    * No OB.