Performance gain of TWRT over OWRT in energy efficiency with unequal circuit powers at each node. The gain of the maximal energy efficiency of TWRT over that of OWRT, considering unequal circuit power consumptions at each node. The circuit powers of node in transmit, receive, and idle modes are, respectively, , and . The circuit powers of nodes and ℝ are and where k
reflect the unequal circuit powers at the three nodes. The attenuation factor α = 4.