Buffer-aided relaying with adaptive link selection
Zlatanov N, Schober R, Popovski P (2013)
Publication Type: Journal article
Publication year: 2013
Journal
Book Volume: 31
Pages Range: 1530-1542
Article Number: 6330084
Journal Issue: 8
Abstract
In this paper, we consider a simple network consisting of a source, a half-duplex decode-and-forward relay, and a destination. We propose a new relaying protocol employing adaptive link selection, i.e., in any given time slot, based on the channel state information of the source-relay and the relay-destination link a decision is made whether the source or the relay transmits. In order to avoid data loss at the relay, adaptive link selection requires the relay to be equipped with a buffer such that data can be queued until the relay-destination link is selected for transmission. We study both delay-constrained and delay-unconstrained transmission. For the delay-unconstrained case, we characterize the optimal link selection policy, derive the corresponding throughput, and develop an optimal power allocation scheme. For the delay-constrained case, we propose to starve the buffer of the relay by choosing the decision threshold of the link selection policy smaller than the optimal one and derive a corresponding upper bound on the average delay. Furthermore, we propose a modified link selection protocol which avoids buffer overflow by limiting the queue size. Our analytical and numerical results show that buffer-aided relaying with adaptive link selection achieves significant throughput gains compared to conventional relaying protocols with and without buffers where the relay employs a fixed schedule for reception and transmission. © 1983-2012 IEEE.
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APA:
Zlatanov, N., Schober, R., & Popovski, P. (2013). Buffer-aided relaying with adaptive link selection. IEEE Journal on Selected Areas in Communications, 31(8), 1530-1542. https://dx.doi.org/10.1109/JSAC.2013.130816
MLA:
Zlatanov, Nikola, Robert Schober, and Petar Popovski. "Buffer-aided relaying with adaptive link selection." IEEE Journal on Selected Areas in Communications 31.8 (2013): 1530-1542.
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