Physical Layer Security in Large-Scale Probabilistic Caching: Analysis and Optimization

被引：27
|
作者：
Zhang, Shubin [1 ]
Sun, Wen [2 ]
Liu, Jiajia [2 ]
Nei, Kato [3 ]
机构：
[1] Xidian Univ, Sch Cyber Engn, Xian 710126, Shaanxi, Peoples R China
[2] Northwestern Polytech Univ, Sch Cybersecur, Xian 710071, Shaanxi, Peoples R China
[3] Tohoku Univ, Grad Sch Informat Sci, Sendai, Miyagi 9808577, Japan
来源：
IEEE COMMUNICATIONS LETTERS | 2019年 / 23卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Edge caching; content placement; optimization; physical layer security; SMALL-CELL NETWORKS;
D O I：
10.1109/LCOMM.2019.2926967
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
Edge caching is proposed to offload traffic from backhaul links by storing popular contents on edge servers and reusing these pre-cached contents to meet the frequent requests from local users. Due to the limited computing and caching resources of edge servers, the traditional encryption and decryption technologies, deployed in the upper layers of protocol stacks, appeared difficult in providing secure content delivery for the growing number of mobile users. In this letter, we consider the physical layer security issues for the popular probabilistic caching. Unlike most prior works, which are concentrated on maximizing achievable transmission rate, we analyze the average secure delivery probability of the caching network and jointly optimize the redundant rate and caching probabilities. Simulation results are identical with the theoretical ones and the outperformance over existing caching strategies is observed with the optimal caching probability derived in this letter.
引用
收藏
页码：1484 / 1487
页数：4
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