Exploiting energy-saving potential in heterogeneous networks.

We investigate the energy-saving potential of transport protocols. We seek an answer to strategic issues of maximising energy and bandwidth exploitation, without damaging the dynamics of multiple-flow equilibrium. We claim that (i) an energy-saving strategy of the transport level needs to be associated with some energy potential index which, unlike energy expenditure, is not device-specific and (ii) system-wise an energy-efficient system of flows is not always a better choice: we show that a less energy-efficient system may be more reliable in terms of packet multiplexing and, in turn, may reduce the probability that some flows may expend their energy with zero gain. We perform experiments using a real testbed and ns-2 based simulations. [ABSTRACT FROM AUTHOR]