Abstract
Applying data buffers at relay nodes significantly improves the outage performance in relay networks, but the performance gain is often at the price of long packet delays. In this paper, a novel relay selection scheme with significantly reduced packet delay is proposed. The outage probability and average packet delay of the proposed scheme under different channel scenarios are analyzed. Simulation results are also given to verify the analysis. The analytical and simulation results show that, compared with non-buffer-aided relay selection schemes, the proposed scheme has not only significant gain in outage performance but also similar average packet delay when the channel signal-to-noise ratio (SNR) is high enough, making it an attractive scheme in practice.
Highlights
R ELAY selection provides an attractive way to harvest the diversity gain in multiple relay cooperative networks [1], [2]
We propose a novel buffer-aided relay selection scheme with significantly reduced packet delay
The system model of buffer-aided relay selection is similar to that shown in Fig. 1, except that every relay is equipped with a data buffer Qk (1 ≤ k ≤ N ) of finite size L
Summary
R ELAY selection provides an attractive way to harvest the diversity gain in multiple relay cooperative networks [1], [2]. We propose a novel buffer-aided relay selection scheme with significantly reduced packet delay. This is achieved by giving higher priority to select the relay-todestination than the source-to-relay links, so that the data queues at relay buffers are as short as possible. The remainder of this paper is organized as follows: Section II proposes the new relay selection scheme; Section III analyzes the outage probability; Section IV analyzes the average packet delay; Section V analyzes the asymptotic performance; Section VI shows simulation results; and Section VII concludes this paper
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