Energy harvesting communications with continuous energy arrivals

Abstract

Abstract-This work considers an energy harvesting transmitter that gathers a continuous flow of energy from intermittent sources, thus relaxing the modeling assumption of discrete amounts of harvested energy present in all previous work on energy harvesting communications. Tools from convex analysis are utilized to describe the optimal transmission policy as the boundary of a properly defined region based on the energy profile. The results are extended to include models where the transmitter has a finite capacity battery with various imperfections, as well as those that incorporate a processing cost (circuit power) at the transmitter whenever it is in operation.

Optimal Transmission Policies for Multi-Hop Energy Harvesting Systems

“…Based on (18), (19) and p * rd,B * sr,s (t) < p * rd,Bsr (t), ∀t ∈ (a, t 0 ), we have E * rd,B * sr,s (t 0 ) < E * rd,Bsr (t 0 ). This proves (17).…”

“…In [18], a throughput maximization problem with battery imperfections has been studied. The authors in [19] investigate an EH system with a degrading battery of finite capacity by convex analysis tools for a continuous harvested energy curve. Although, in [18], [19], the harvested energy curve is continuous but all data is stored in information buffer at the beginning of the transmission and the arrival data curve has not been considered.…”

“…To sum up, considering a system with continuous data arrival in a multi-hop setup is significant when analyzing EH systems. Besides, since the amount of harvested energy in an energy harvester device is naturally continuous by time, considering a continuous-time model will be more appropriate for the amount of harvested energy [19], [23].…”

On Optimal Online Algorithms for Energy Harvesting Systems With Continuous Energy and Data Arrivals

“…Considering a discrete model for the EH process in [2], an online algorithm to maximize the throughput of a wireless channel with arbitrary fading coefficients is designed. Recently, a few works have considered a continuous model for the harvested energy in the throughput maximization problem [3]- [5]. M Our focus in this letter is on the delay metric, i.e., the time minimization problem, which is investigated in [6]- [8].…”

“…The continuity assumption together with the arrival data existence makes our proof techniques to be different from the existing works. Although most of existing research works assume a discrete model for the harvested energy to make the analysis tractable, a continuous model is more accurate for the EH sources in many applications [3], [9]. Besides, as we show in Section IV, the discretizing of harvested energy curve reduces the efficiency of system.…”