Optimal packet scheduling in a multiple access channel with energy harvesting transmitters

• Published in: Journal of communications and networks Vol. 14; no. 2; pp. 140 - 150
• Main Authors: Jing Yang, Ulukus, S.
• Format: Journal Article
• Language: English
• Published: Editorial Department of Journal of Communications and Networks 01.04.2012; 한국통신학회
• Subjects: Convex functions; Energy harvesting; Energy-harvesting communications; iterative backward waterfilling; Minimization; multi-access channel; Resource management; Scheduling algorithms; throughput maximization; Transmitters; 전자/정보통신공학
• ISSN: 1229-2370; 1976-5541
• DOI: 10.1109/JCN.2012.6253062

In this paper, we investigate the optimal packet scheduling problem in a two-user multiple access communication system, where the transmitters are able to harvest energy from the nature. Under a deterministic system setting, we assume that the energy harvesting times and harvested energy amounts are known before the transmission starts. For the packet arrivals, we assume that packets have already arrived and are ready to be transmitted at the transmitter before the transmission starts. Our goal is to minimize the time by which all packets from both users are delivered to the destination through controlling the transmission powers and transmission rates of both users. We first develop a generalized iterative backward waterfilling algorithm to characterize the maximum departure region of the transmitters for any given deadline T. Then, based on the sequence of maximum departure regions at energy arrival instants, we decompose the transmission completion time minimization problem into convex optimization problems and solve the overall problem efficiently.