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OPTIMAL PARTIAL RELAYING FOR ENERGY-HARVESTING WIRELESS
NETWORKS
ABSTRACT:
In this paper, we asses the benefits of using partial relaying in energy-harvesting
networks. We consider a system composed of a source, a relay, and a destination. Each of the
source and the relay has energy-harvesting capability and generates its own traffic. The
source is helped by the relay through a partial relaying network-level cooperation protocol.
The relay regulates the arrivals from the source by accepting only a proportion of the
successfully received packets at the relay. The relaying parameter, which determines the
proportion of packets to be accepted, is selected based on the parameters of the network to
ensure the stability of the source and the relay data queues. In this work, we provide an exact
characterization of the stability region of the network. We derive the optimal value of the
relaying parameter to maximize the stable throughput of the source for a given data arrival
rate to the relay. Also, we compare the stability region of the proposed strategy with partial
relaying to the stability regions of simple transmission strategies. Finally, we consider the
problem of network utility optimization in which we optimize over the value of the relaying
parameter for a given pair of data arrival rates for the source and the relay.