Table 6 List of variables
From: A power efficient MAC protocol for wireless body area networks
Variable | Explanation |
|---|---|
P tx | Power required for TX (transmission) |
P rx | Power required for RX (reception) |
T data | Time required for data packet transmission |
T ack | Time required for Ack packet transmission |
T b | Time required for Beacon packet transmission |
P t | Power required to switch the transceiver between RX and TX |
T t | Time required to switch the transceiver between RX and TX |
N | Number of one hop neighboring nodes |
P active | Power consumption in active state |
R | Data rate of the radio |
L x | Length of a frame x, where x ∈ {data, ack, beacon, wakeup} |
P tr | Power required to turn on the transceiver from sleep state into the RX or TX state |
T tr | Time required to turn on the transceiver from sleep state into the RX or TX state |
θ | Crystal tolerance of a wakeup timer |
T cca | Time required for CCA or carrier sensing |
P sl | Power consumed in sleep state |
P twbn | Power required to transmit low power wakeup packet |
P rwbn | Power required to receive low power wakeup packet |
T wbn | Time required to send low power wakeup packet |
P twack | Power required to transmit low power Ack packet |
T wk | Interval between preamble/beacon samplings |
T sl | Time spend in sleep state |
T p | Preamble duration |
T wkrx | Interval between preamble samplings in X-MAC |
N probe | Expected preamble-listen iterations required |
T | Total time duration |
T px | Average number of preambles during time T |