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In this paper, we propose a novel max-weight secure link selection (MWSLS) scheme to enhance physical layer security of decode-and-forward (DF) buffer-aided relay networks. The MWSLS scheme can select the link with the largest weight among all secure and available source-to-relay and relay-to-destination links. By modeling the dynamic buffer state transitions as a Markov chain, we derive the closed-form expressions of the secrecy outage probability, the secrecy diversity gain, the average secrecy throughput and the end to end delay, which provide a comprehensive and effective way to evaluate the impacts of different parameters on the secrecy performance. The results of this paper reveal that: 1) For the case with small buffer sizes, a significant enhancement on the secrecy outage performance can be observed compared with the popular max-link secure link selection (MLSLS) scheme. 2) When <inline-formula> <tex-math notation="LaTeX">$L\ge 3$ </tex-math></inline-formula>, the secrecy diversity gain of the system can achieve <inline-formula> <tex-math notation="LaTeX">$2M$ </tex-math></inline-formula>, while the MLSLS scheme achieves the same secrecy diversity gain only when <inline-formula> <tex-math notation="LaTeX">$L \to \infty $ </tex-math></inline-formula> (where <inline-formula> <tex-math notation="LaTeX">$M$ </tex-math></inline-formula> denotes the number of relays and <inline-formula> <tex-math notation="LaTeX">$L$ </tex-math></inline-formula> is the buffer size). 3) The MWSLS scheme outperforms the MLSLS scheme in terms of the average secrecy throughput and the end to end delay in the low signal-to-noise ratio (SNR) regime, and obtain the same performance as the latter in the high SNR regime.

Enhancing Physical Layer Security of DF Buffer-Aided Relay Networks With Small Buffer Sizes