Re: [v6ops] unicast RA to save battery: link-layer joining multicast groups

Andrew Yourtchenko <ayourtch@gmail.com> Wed, 22 July 2015 12:18 UTC

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From: Andrew Yourtchenko <ayourtch@gmail.com>
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Date: Wed, 22 Jul 2015 14:18:17 +0200
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To: Alexandru Petrescu <alexandru.petrescu@gmail.com>
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Subject: Re: [v6ops] unicast RA to save battery: link-layer joining multicast groups
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You proposed dropping all multicast RAs when device is I standby. I commented that the devices are already doing it and it is exactly a problem that we are trying to solve with the draft, thus the suggestion is unhelpful. 

Makes sense ?

--a

Sent from my iPhone

> On 22 Jul 2015, at 14:06, Alexandru Petrescu <alexandru.petrescu@gmail.com>; wrote:
> 
> Thanks for the pointer, but that's a long discussion, it's hard to draw quickly a conclusion on it.
> 
> I would think to argue that if Android has a problem in this then it's an Android problem.
> 
> If it's a particular driver problem (dependent on the card of that samsung phone) then fix that problem.
> 
> Maybe it's not so.
> 
> But I am sure the linux devices I use dont consume more power when receiving more RAs, on wifi.
> 
> And even if they did, I have enough batteries and enough other sources of energy to provide them in order to be able to make handovers fast enough to not loose 1 single packet.
> 
> Not sure whether the goal here is to save energy?
> 
> Alex
> 
> Le 22/07/2015 10:34, Andrew 👽  Yourtchenko a écrit :
>> This is what some phones do today and is exactly the problem we are
>> trying to solve.
>> 
>> https://code.google.com/p/android/issues/detail?id=32662
>> 
>> --a
>> 
>>> On 7/21/15, Alexandru Petrescu <alexandru.petrescu@gmail.com>; wrote:
>>> On another hand,
>>> 
>>> IEEE 802.11bgn multicast groups (33::1 etc) are 'joined' at MAC layer by
>>> setting filters.  (maybe even by MAC messaging for joining MAC multicast
>>> groups).
>>> 
>>> Maybe we can request the Hosts to set local filters to not receive
>>> multicast RAs.  Or request the Hosts short on energy to express interest
>>> in these IPv6 multicast groups.
>>> 
>>> Alex
>>> 
>>> _______________________________________________
>>> v6ops mailing list
>>> v6ops@ietf.org
>>> https://www.ietf.org/mailman/listinfo/v6ops
>