02 s
tlpl
slp Sleep period of the radio in the LPL mode variable
ilpl Amortized current drawn by an XSM variable
in the LPL mode
mpr # control messages transmitted every hour 240
me # event-detection messages generated by the variable
heaviest-loaded XSM every hour
mpp # event-detection messages routed by the variable
heaviest-loaded XSM every hour
imsg
act Current drawn in transmitting 1 packet variable
when the radio is in active mode (no LPL)
imsg
lpl Current drawn in transmitting 1 packet variable
when the radio is in LPL mode
ievent
awk Amortized current drawn in staying variable
awake due to events
isensor Current drawn by continuously active sensors variable
frepr # reprogramming is performed wirelessly 6
erepr Energy spent in 1 wireless reprogramming 18.22
mA-hr
elocalization Energy spent in 1 localization 4 mA-hr
ilpl: Amortized current drawn by an XSM in the LPL mode. Its value depends
on the following four factors:
1. tlpl
slp - The sleep period used for the radio (listed above).
2. ilpl
slp - The average current consumed by an XSM when the processor
and radio are sleeping (excluding the current consumed by any active
sensor). By measurement on an XSM, we found that ilpl
slp =0.1974
mA9.
9 This is a significantly higher value than expected in sleep mode. We expected it
to be close to 0.035 mA. The higher value of 0.1974 mA is because in the LPL
mode, the XSM wakes up every 27.
Pages:
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447