Re: [6tisch] [minimal] rank calculation when numTxACK is zero

2016-05-30 Thread Pascal Thubert (pthubert)
. Cheers, Pascal From: 6tisch [mailto:6tisch-boun...@ietf.org] On Behalf Of Tengfei Chang Sent: lundi 30 mai 2016 11:37 To: Fabrice Theoleyre Cc: 6tisch@ietf.org Subject: Re: [6tisch] [minimal] rank calculation when numTxACK is zero Dear Fabrice, Yes, I agree that both ETX of 15 and 1 are not

Re: [6tisch] [minimal] rank calculation when numTxACK is zero

2016-05-30 Thread Tengfei Chang
Dear Fabrice, Yes, I agree that both ETX of 15 and 1 are not appropriate. An ETX threshold value should be a good idea to avoid the cases that parent frequently changes or not change at all. Thanks for the good advice! Regard, Tengfei On Sat, May 28, 2016 at 9:24 AM, Fabrice Theoleyre wrote:

Re: [6tisch] [minimal] rank calculation when numTxACK is zero

2016-05-28 Thread Fabrice Theoleyre
Dear Tengfei, Thank you Tengfei for pointing out this problem. However, it may perform poorly in dense networks: a node has to test iteratively each neighbor. Let me describe what I imagine: -> a node selects one neighbor P as parent (default ETX = 1) -> after sending many packets, the ETX of

[6tisch] [minimal] rank calculation when numTxACK is zero

2016-05-27 Thread Tengfei Chang
Dear all, The OpenWSN community recently has a question related to the calculation of RANK in minimal draft. and I would like share with you. In minimal draft, the link quality is measured by ETX=(numTX/numTXAck). 1. At the beginning of the network, numTxACK is zero. we need to give a default va