Hi all,
After reading the CTP paper and understanding the implementation in TinyOS, I
conducted a numerical example to understand the behaviour of ETX. I had the
following observations:
1) Beacon-driven link quality (BLQ) tends to increase the value of ETX, while
data-driven link quality (DLQ) tends to decrease the value of ETX.
2) BLQ is unidirectional from the incoming beacons, while DLQ is bidirectional
from data packets and ACKs.
3) BLQ is calculated for all neighbours, while DLQ is calculated for my the
next hop neighbour only.
4) ACK is on 1-to-1 basis, which means that a node sends a single data packet
and waits for the ACK before sending a new data packet.
5) ACK does not include the seq. number of the data packet since it is a 1-to-1
scheme.
6) Snoop and intercept do not update the neighbour entries in the routing
tables.
Are my observations about CTP correct?
Regards
Islam
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