yep, makes sense. We thought it in the wrong way then. I update minimal right now.
thanks for the quick response! X 2016-11-21 14:29 GMT+01:00 Thomas Watteyne <thomas.watte...@inria.fr>: > Tero, > > Your explanation about setting the cell to ADVERTISING makes sense. > > Xavi? > > Thomas > > On Mon, Nov 21, 2016 at 1:26 PM, Tero Kivinen <kivi...@iki.fi> wrote: > >> Xavi Vilajosana Guillen writes: >> > We discussed this. We said to use NORMAL in order to support any type of >> > packet in the minimal cell/s and not only EBs. From our discussions, I >> think >> > that we all understood (at least is what I captured in the minimal >> text) that >> > if the type is NORMAL we can also send EBs there and hence we discarded >> > ADVERTISEMENT type. >> >> I would disagree with that. >> >> Note, that LinkType of ADVERTISING and NORMAL are local matters, they >> are never transmitted over air, and there is not bits for them in the >> IEs. >> >> The section 8.2.19.3 MLME-SET-LINK.request of 802.15.4-2015 says: >> >> LinkType Enumeration ADVERTISING, Set to ADVERTISING if the link >> NORMAL is to be used to advertise the >> network, otherwise set to NORMAL. >> >> And: >> >> If LinkType is set to ADVERTISE, the links may be used to send >> Enhanced Beacon frames as the result of the MAC receiving a >> MLME-BEACON.request. >> >> Then in section "6.3.6 TSCH PAN formation" the text talks about the >> "advertising device": >> >> A TSCH PAN is formed when a device, referred to as an >> advertising device, advertises the presence of the network by >> sending Enhanced Beacon frames upon receipt of a >> MLME-BEACON.request from a higher layer. In a TSCH PAN the >> Enhanced Beacon frames contain the following IEs: >> >> ... >> >> My understanding is that the fact that LinkType is set to ADVERTISING >> indicates that specific link is used to send Enhanced Beacons out, >> i.e. it is used to advertise the network compared to the other tx >> links, which are not used to advertise network, but which are used for >> normal traffic in the network. >> >> The ADVERTISING link can also be used to send normal traffic on it, >> and it may be used to send Enhanced Beacons after the higher layer >> calls MLME-BEACON.request. I.e., MAC layer somehow needs to know which >> link it should be using to send beacons out, and ADVERTISING LinkType >> tells that to the MAC level. I also assume that the same link is also >> used to send periodic Enhanced Beacons, altough I do not think that is >> specified anywhere in the 802.15.4-2015. >> >> I do not know what the MAC level does if none of the links are set to >> ADVERTISING and higher layer calls MLME-BEACON.request. It might wait >> for the next ADVERTISING link, and not finding them it would not send >> the EB out ever. >> >> So I think the LinkType for the minimal should be set as ADVERTISING, >> so it can will be used to send EBs and other traffic out. >> >> > A clarification of these will be really valuable now that I will >> > proceed with the revision of minimal. >> -- >> kivi...@iki.fi >> > > > > -- > _______________________________________ > > Thomas Watteyne, PhD > Research Scientist & Innovator, Inria > Sr Networking Design Eng, Linear Tech > Founder & co-lead, UC Berkeley OpenWSN > Co-chair, IETF 6TiSCH > > www.thomaswatteyne.com > _______________________________________ > -- Dr. Xavier Vilajosana Guillén Research Professor Wireless Networks Research Group Internet Interdisciplinary Institute (IN3) Universitat Oberta de Catalunya +34 646 633 681| xvilajos...@uoc.edu | Skype: xvilajosana http://xvilajosana.org http://wine.rdi.uoc.edu/ Parc Mediterrani de la Tecnologia Av. Carl Friedrich Gauss, 5. Edifici B3 08860 Castelldefels (Barcelona)
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