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| In this paper, we study a bidirectional two-way relaying selection network consisting of a source, a destination and multiply half-duplex decode-and-forward (DF) relays. Firstly, we consider three time slots transmission model. In the first slot, selected relay applies time-switching protocol to harvest radio frequency energy radiated by source and destination; in the remaining slots, selected relay cooperates source and destination for information exchange. Secondly, due to finite-size data buffer and finite-size battery of relay, we propose optimal relay selection and power allocation policy, under the delay-tolerant and delay-constraint constraints. Without considering the link outage, users can adaptively adjust transmission rate to maximize system sum-throughput. In addition, we analyze the effect of transmission time on sum-throughput. However, our sum-throughput optimization problem is a non-convex problem. Further, we relax relay selection coefficient and use Karush-Kuhn-Tucker (KKT) conditions. The optimal power is obtained by Lagrange dual decomposition. Simulations can prove that sum-throughput of our proposed strategy is affected by buffer size and battery capacity, as well as time allocation of each transmission phase. |
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| Keywords:Battery, data buffer, energy harvest, throughput maximization, two-way. |
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