On Aug 7, 2006, at 11:05 PM, Diego Bartolomé Arquillo wrote:
Hi all,
I am agree with Phil about the section 5.1 of the paper. It is not
neccesary to fire a timer every 20 symbols. I think the statement:
"In order to communicate in a beacon-enabled network, a timer
expiring every 20 symbols, i.e. 320 us, is needed" is not correct.
The only real problem that I see, could be the related in section
5.3. If it is true that the transmission of an acknowledgment from
software require 132 symbols, it will not be possible to carry out
the timing requirements for slotted acknowledgments.
Unfortunately, the paper is not specific enough in where that cost
goes. 132 symbols is 1.8ms. That seems high; I've been able to
transmit full packets at 600Hz (1.6ms) when backoffs are enabled.
Also, there's the question of whether they are generating a new full
packet and sending it (slow), or if they are using the hardware
functionality the CC2420 provides specifically for this purpose, the
SACK strobe register (fast).
Phil
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