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In this work, we address the relay selection problem for the wireless poweredcommunication networks, where the relays harvest energy from the source radiofrequency signals. A single source-destination pair is considered without adirect link. The connecting relay nodes are equipped with storage batteries ofinfinite size. We assume that the channel state information (CSI) on thesource-relay link is available at the relay nodes. Depending on theavailability of the CSI on the relay-destination link at the relay node, wepropose different relay selection schemes and evaluate the outage probability.The availability of the CSI at the relay node on the relay-destination linkconsiderably improves the performance due to additional flexibility in therelay selection mechanism. We numerically quantify the performance for theproposed schemes and compare the outage probability for fixed and equal numberof wireless powered forwarding relays.

Minimizing Outage Probability by Exploiting CSI in Wireless Powered Cooperative Networks