Hi,
The LQI measurement is a characterization of the strength and/or quality of a
received packet.
The LQI measurement shall be performed for each received packet, and the result
shall be reported to the MAC sublayer using PD-DATA.indication (see 6.2.1.3
Std. 802.15.4) as an integer ranging from 0x00 to 0xff. The minimum and maximum
LQI values (0x00 and 0xff) should be associated with the lowest and highest
quality compliant signals detectable by the receiver, and LQI values in between
should be uniformly distributed between these two limits.
I’ve just done a little ‘test’ program in order to see the best link quality of
the end-devices(micaZ devices) with respect the coordinator of my network.
Imagine a network where there may be multiple coordinator devices and many more
end-devices. I want that each end-device will attempt join to the coordinator
which has the best link quality (nearest).
The problem is that the link quality varies ONLY between values [100, 108]
–decimal- when all the devices are totally together (distance < 3 cm),
corresponding to [0x64, 0x6C] in hexadecimal.
I don’t know why LQI never reaches the maximum value (0xFFFF).
I’m using IEEE 802.15.4 TinyOS Implementation (TKN154) whose libs are located
at "/tos/lib/mac/tkn154" and test applications at "/apps/tests/tkn154"
directories.
Any help will be very appreciate.
Thanks a lot,
Felipe Cruz.
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