DocumentCode :
56043
Title :
Buffer-Aided Relaying with Adaptive Link Selection
Author :
Zlatanov, Nikola ; Schober, Robert ; Popovski, Petar
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of British Columbia, Vancouver, BC, Canada
Volume :
31
Issue :
8
fYear :
2013
fDate :
Aug-13
Firstpage :
1530
Lastpage :
1542
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.
Keywords :
buffer circuits; decode and forward communication; optimisation; protocols; radio links; relay networks (telecommunication); adaptive link selection; buffer aided relaying; buffer overflow; channel state information; decision threshold; delay constrained transmission; delay unconstrained transmission; half duplex decode and forward relay; link selection protocol; optimal power allocation scheme; queue size; relay destination link; relaying protocol; source relay link; throughput; wireless relay network; Adaptive systems; Delay; Optimized production technology; Protocols; Queueing analysis; Relays; Throughput; Wireless relay network; adaptive link selection; buffer-aided; delay; relaying; throughput;
fLanguage :
English
Journal_Title :
Selected Areas in Communications, IEEE Journal on
Publisher :
ieee
ISSN :
0733-8716
Type :
jour
DOI :
10.1109/JSAC.2013.130816
Filename :
6330084
Link To Document :
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