Re: [pim] [Mcast-wifi] Issues with MLD and Android powersaving / sleep mode...

Dino Farinacci <farinacci@gmail.com> Fri, 27 March 2020 22:09 UTC

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From: Dino Farinacci <farinacci@gmail.com>
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Date: Fri, 27 Mar 2020 15:09:17 -0700
Cc: =?utf-8?Q?Linus_L=C3=BCssing?= <linus.luessing@c0d3.blue>, mcast-wifi@ietf.org, Mark Smith <markzzzsmith@gmail.com>, pim@ietf.org
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To: Hitoshi Asaeda <asaeda@ieee.org>
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Subject: Re: [pim] [Mcast-wifi] Issues with MLD and Android powersaving / sleep mode...
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> RFC6636 (Tuning the Behavior of the Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) for Routers in Mobile and Wireless Networks) gives some guideline to tune IGMP/MLD.
> Android and iOS implement some specific mechanisms to save battery power, hence I don't know if they work what we expect, though.

The techniques in this RFC are good but to get bang for the buck, the quering router needs to support Explicit Tracking, as you stated in the document.

But the RFC does not say what to do when a mobile node goes to sleep and how it should, or if it should, be woken up to refresh group membership status.

One important technical questiont that should be asked and answered is: 

Should a mobile host send a Leave message when the app is still joined to the group but the phone wants to go to sleep.

Dino