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Re: [6tisch] downstream traffic adaptation

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Fri, 23 August 2019 14:23 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Tengfei Chang <tengfei.chang@gmail.com>, 6tisch <6tisch@ietf.org>
Thread-Topic: [6tisch] downstream traffic adaptation
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Date: Fri, 23 Aug 2019 14:23:13 +0000
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Subject: Re: [6tisch] downstream traffic adaptation
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Looks good Tengfei. Did you already implement and test?

Pascal

From: 6tisch <6tisch-bounces@ietf.org> On Behalf Of Tengfei Chang
Sent: vendredi 23 août 2019 14:28
To: 6tisch <6tisch@ietf.org>
Subject: [6tisch] downstream traffic adaptation

Hi All,

As discussed in IETF 105, we are going to support adapting downstream traffic.
And now this feature is added in draft-ietf-6tisch-msf-06 published one weeks ago.

Some main changes related to this feature are:

  1.  After joined the network and got Rank, the node will only add one Tx Cell to its parent (NOT add Rx Cell)
  2.  When adapting downstream traffic, the mote will check the cell usage on the Rx Cells.
  3.  At each Rx cell to parent, the NUMCELLELAPSE increments
  4.  If there is any frames received on the Rx cell, the NUMCELLUSED increments
  5.  If NUMCELLELAPSE reaches MAX_NUMCELLS, check the percentage of cell usage, if higher than the high threshold, add one Rx cell to parent, if lower than the low threshold, remove one Rx cell to parent.
  6.  The AutoRx cell is used for downstream as well and will never be removed.
Those changes are integrated into version 06 content. You can read it to check exactly how we did the changes.
Please let me know if you have comments on them. Thanks!

Tengfei

--
Chang Tengfei,
Postdoctoral Research Engineer, Inria

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