Hi Michel,
The idea is very interesting since the nodes are provisioned with the right
value upfront via BEACON IE so that they start using the power that is
appropriate, as determined by the PAN coordinator. In the absence of
this, the
nodes might start-off with arbitrary power levels that can potentially
result
in unpredictable network behaviour for the existing flows. I would
assume, the
coordinator will have an ability to manage these power levels by
re-provisioning them depending on the state of the network in a way that the
hidden and exposed node problems are avoided.
One more thought. Does it make sense to use the BEACON IE approach when the
node joins the network and let an external centralized controller (NME), use
the 6top MIB interface to subsequently manage the phyTXPower ? The
assumption
is that the interface provides the output power limit of the node as well.
Am I missing something here ?
Anand
On Monday 08 June 2015 09:03 PM, Michel Veillette wrote:
> Hi Anand and Qin
>
>
>
> Ill like to introduce the idea of supporting the option of
adding the phyTXPower value in an IE within BEACON frames.
>
> Provisioning the phyTXPower can be an issue when targeting multiple
markets with different output power limits.
>
> Including the phyTXPower within BEACON frames will enable joining
nodes to adjust dynamically their output power based on a value managed
at the PAN coordinator.
>
>
>
> cid:image001.jpg@01C868D8.BF0BB7E0
>
>
> Michel Veillette
> System Architecture Director
>
> Trilliant Inc.
> Tel: 450-375-0556 ext. 237
> michel.veille...@trilliantinc.com
>
> www.trilliantinc.com
>
>
>
>
>
> From: 6tisch [mailto:6tisch-boun...@ietf.org] On Behalf Of Qin Wang
> Sent: 8 juin 2015 11:08
> To: an...@ece.iisc.ernet.in; Kris Pister
> Cc: 6tisch@ietf.org
> Subject: Re: [6tisch] 6top and transmit power control
>
>
>
> Hi Anand,
>
>
>
> Regarding to power management, there is a parameter in the
IEEE802.15.4 PIB, i.e. phyTXPower. You can control the transmitting
power by changing its value. Is that what you want? If so, I think
6tisch MIB will provide the interface to access phyTXPower, which will
be defined in the 6tisch-interface draft.
>
>
>
> Thanks
>
> Qin
>
>
>
>
>
>
>
> On Saturday, June 6, 2015 2:50 PM, "an...@ece.iisc.ernet.in"
<an...@ece.iisc.ernet.in> wrote:
>
>
>
> Hi Kris,
>
> Thanks!
>
> I was not sure if and how such a parameter can be accommodated in the
> current scheme of things, although it could be a useful control parameter
> from the operator's perspective.
>
> Anand
>
>
>
> > seems like a good idea.
> >
> > ksjp
> >
> > On 6/4/2015 4:15 AM, SVR Anand wrote:
> >> Dear All,
> >>
> >> A slight digression from the ongoing ML discussions. Hope the timing
> >> is OK!
> >>
> >> As we all know, transmit power control is one of the powerful knobs
> >> that can be
> >> used to minimize the interference and thereby improve the wireless
> >> network
> >> performance and also provide deterministic network. Cell breathing
> >> technique
> >> used in WLANs comes to our mind. When it comes to 6tisch, one might
> >> argue that
> >> with 16 channels at our disposal, the interference can be avoided
> >> through smart
> >> 6top cell management interface without worrying much about transmit
> >> power
> >> control. However, there can be scenarios where transmit power control
> >> might be
> >> required, for instance, (i) large scale dense deployments with heavy
> >> traffic
> >> demands (ii) Co-existing WiFi reducing available non-overlapping
> >> channels for
> >> 15.4 (iii) prevent wireless leaks beyond the periphery of the
> >> deployement
> >> region and (iv) OTF scheduling where nodes make local decisions for
> >> managing
> >> cells, may be more.
> >>
> >> One possibility is to leave the power management to the nodes. We are
> >> then
> >> leaving this to implementors to device their own algorithms to handle
> >> interference. Alternatively, a centralised controller (NME)
knowing the
> >> information about conflicting links can adaptively and optimally
> >> adjust the
> >> operating transmit power of the nodes to avoid the interference and
> >> maximize
> >> the wireless network performance.
> >>
> >> If we treat transmit power as one of the controllable parameters along
> >> with the
> >> cell management parameters, wondering if 6tisch 6top interface MIB is
> >> the place
> >> to define this. Or this parameter is beyond the scope of 6tisch.
> >>
> >> Any suggestions ?
> >>
> >> Anand
> >>
> >
> >
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