دانلود رایگان مقاله انگلیسی قرار دادن کش ترکیبی برای امنیت فیزیکی لایه در شبکه های همیاری - نشریه IEEE

Abstract

Due to the broadcast nature of wireless transmission, traditional wireless two-hop relaying is vulnerable for eavesdroppers to overhear messages. In order to enhance the physicallayer security, this paper studies one cooperative network with caching relays to reduce the transmission links overheard by the eavesdropper. Relays are grouped into different clusters so that the secrecy outage probability of any cluster is better than the traditional two-hop transmission. Based on the secrecy outage probability of clusters and the groups of files, we propose a novel hybrid cache placement (HCP) which combines the traditional base station caching strategy, most popular content caching strategy (MPC) and largest content diversity (LCD) caching strategy to cache the popular contents. The performance analysis and optimal design results are provided on the two objective functions: the secrecy outage probability and average secrecy capacity. From these two objective functions, some interesting observations are reached: for the function of secrecy outage probability, we can always find an optimal value of most popular files to minimize the secrecy outage probability, and for the function of average secrecy capacity, we can also find an optimal value of most popular files to maximize the average secrecy capacity. The numerical and simulation results are finally demonstrated to verify the proposed studies.

VI. CONCLUSIONS

In this paper, we proposed a novel method that using the hybrid cache placement to improve the physical layer security in cooperative networks. The main idea of hybrid cache placement is combining three different cache strategies to cache different files in terms of the secrecy outage probability of relay clusters and the popularity of files. We presented the performance analysis results and optimal design results on secrecy outage probability and average secrecy capacity, and some interesting observations are reached. For secrecy outage probability, we know that there always exists an optimal value of most popular files to minimize the secrecy outage probability, and for average secrecy capacity, we also see that there always exists an optimal value of most popular files to maximize the average secrecy capacity. Finally, the numerical simulations were provided to verify our analytical results that utilizing hybrid cache placement can contribute to improve the physical layer security in cooperative networks.