Dear Georgios,
Thanks for the feedback, responding to your query : Deadline Time (DT) by itself does not guarantee deterministic behaviour, but its information enables intermediate nodes to implement delay sensitive scheduling and routing algorithms towards achieving deterministic behaviour. As a use case application of our draft, we implemented a basic EDF policy in OpenWSN 6tisch stack. Please find the link for our openwsn implementation https://github.com/openwsn-berkeley/openwsn-fw/tree/develop/openapps/uexpiration Thanks & Regards, Lijo Thomas From: 6lo [mailto:[email protected]] On Behalf Of Georgios Z. Papadopoulos Sent: 24 July 2018 13:49 To: Lijo Thomas Cc: [email protected]; [email protected]; Malati Hegde; Samita Chakrabarti; Gabriel Montenegro; lo; Charlie Perkins; [email protected] Subject: Re: [6lo] working group last call (wg lc) on https://datatracker.ietf.org/doc/draft-ietf-6lo-deadline-time/ Hello Lijo, Thank you so much for your detailed comments. I appreciate it very much. I am happy with your response, I just have one last clarification point, see below: On Jul 24, 2018, at 09:38, Lijo Thomas <[email protected] <mailto:[email protected]> > wrote: Dear Georgios, Thanks for your valuable suggestions and we really appreciate for taking your valuable time for the review . Please find our comments inline below marked as (*** [LT]) We will be happy to receive your further inputs !!! Thanks & Regards, Lijo Thomas From: 6lo [ <mailto:[email protected]> mailto:[email protected]] On Behalf Of Georgios Z. Papadopoulos Sent: 17 July 2018 21:40 To: <mailto:[email protected]> [email protected] Cc: <mailto:[email protected]> [email protected]; <mailto:[email protected]> [email protected]; Malati Hegde; Samita Chakrabarti; Gabriel Montenegro; lo; Charlie Perkins; <mailto:[email protected]> [email protected] Subject: Re: [6lo] working group last call (wg lc) on <https://datatracker..ietf.org/doc/draft-ietf-6lo-deadline-time/> https://datatracker.ietf.org/doc/draft-ietf-6lo-deadline-time/ Dear Lijo and co-authors, I went through the draft, please find my comments below: — — High level comments: */ [GP] The draft defines the Deadline Time (DT), but it is not clear to me how the arrival of the datagram within this pre-defined DT period is guaranteed? Indeed, the draft provides the necessary DT information, however, the only action I could observe is the delay-sensitive datagram to be dropped if the indicated DT is elapsed. *** [LT] Yes, the Deadline Time (DT) specifies the maximum allowable delay before which the packet should be delivered to the destination. The proposed draft provides a mechanism for transporting the DT information. By incorporating deadline based scheduling/routing mechanisms within the intermediate nodes using DT, one could guarantee deterministic behavior in terms of delay. [GP] Would you agree that this draft do not guarantees deterministic behavior in terms of delay, but it provides the information of maximum allowable delay for a packet to be delivered to the destination? To be more precise, for instance, lets us consider the following multi-hop network A—> B —> C. According this draft, it will required 2 timeslots (or 20ms) for a packet to be delivered at the DODAG Root C. However, if there is an external interference from A to B, then A may need to retransmit multiple times in order the datagram to be received by B. Then there are two options according to the draft: a) the datagram is dropped, to reduce the traffic, energy consumption. b) the datagram is delivered even if the deadline time is crossed, i.e., as you said in your e-mail “in some scenarios where the intention is also to know the total delay experienced by the packets in a network” In both bases, a and b, there is no guarantee that the datagram will be delivered in predefined time, i.e., in deterministic behavior. — — Thank you so much, Georgios ____________________________________ Georgios Z. Papadopoulos, Ph.D. Associate Professor, IMT Atlantique, Rennes web: www.georgiospapadopoulos.com <http://www.georgiospapadopoulos.com> twitter: @gzpapadopoulos <https://twitter.com/gzpapadopoulos?ref_src=twsrc%5Etfw&ref_url=http://georgiospapadopoulos.com/> ____________________________________ ------------------------------------------------------------------------------------------------------------------------------- [ C-DAC is on Social-Media too. Kindly follow us at: Facebook: https://www.facebook.com/CDACINDIA & Twitter: @cdacindia ] This e-mail is for the sole use of the intended recipient(s) and may contain confidential and privileged information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies and the original message. 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