Thank you. On Mon, Aug 29, 2011 at 3:48 AM, Daniel Minder <[email protected]>wrote:
> Hi, > > > Can anyone give me some hint on the rationale behind this design and > > why address is not contained and checked in ACK? > > I can only refer to the 802.15.4 standard, which specifies: "The MHR for > an acknowledgment frame shall contain only the Frame Control field and > the Sequence Number field." > > I understand TinyOS radio stack does not check address to be compliant with 802.15.4. But I'm wondering why 802.15.4 does not contain address information in the first place. Just to make ACK shorter and potentially increase it's reliability? > > What if a nearby node, which is not the recipient of the data > > packet, happens to send an ACK with the same DSN? > > I've seen in simulations that I get "wrong" ACKs from other nodes as you > assumed. > I've seem "wrong" ACKs in actual testbed. I noticed sometimes for one unicast packet sent, there are multiple ACKs. That's how I found out. > > Best, > Daniel > > -- > Daniel Minder > University of Duisburg-Essen, Networked Embedded Systems > Bismarckstr. 90, 47057 Duisburg, Germany > Skype: d.minder > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > -- -Xiaohui Liu
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