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Relay nodes are used to improve the throughput, delay and reliabilityperformance of energy harvesting networks by assisting both energy andinformation transfer between information nodes and access point. Previousstudies on radio frequency energy harvesting networks are limited to singlesource single/multiple relay networks. In this paper, a novel joint relayselection, scheduling and power control problem for multiple source multiplerelay network is formulated with the objective of minimizing the total durationof wireless power and information transfer. The formulated problem isnon-convex mixed-integer non-linear programming problem, and proven to beNP-hard. We first formulate a sub-problem on scheduling and power control for agiven relay selection. We propose an efficient optimal algorithm based on abi-level optimization over power transfer time allocation. Then, for optimalrelay selection, we present optimal exponential-time Branch-and-Bound (BB)based algorithm where the nodes are pruned with problem specific lower andupper bounds. We also provide two BB-based heuristic approaches limiting thenumber of branches generated from a BB-node, and a relay criterion based lowercomplexity heuristic algorithm. The performance of the proposed algorithms aredemonstrated to outperform conventional harvest-then-cooperate approaches withup to $88\%$ lower schedule length for various network settings.

Relay Selection, Scheduling and Power Control in Wireless Powered Cooperative Communication Networks