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Optimization of hybrid cache placement for collaborative relaying

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journal contribution
posted on 15.12.2016, 09:27 by Gan ZhengGan Zheng, Himal A. Suraweera, Ioannis Krikidis
Traditional wireless multi-hop relaying systems suffer from inefficient use of bandwidth resources. This letter studies the use of content caching at distributed relays to tackle this problem and improve the performance of collaborative relaying. We propose a hybrid caching scheme that is jointly optimized with the transmission schemes, to achieve a fine balance between the signal cooperation gain and the caching diversity gain. The optimization problem of cache placement to minimize the outage probability is studied and is shown to be convex. Numerical results demonstrate significant outage performance gains over traditional relaying without caching.


. This work was supported in part by the UK Engineering and Physical Sciences Research Council (EPSRC) project EP/N007840/1, and the Research Promotion Foundation, Cyprus, under the project KOINA/ERANETMED/1114/03.



  • Mechanical, Electrical and Manufacturing Engineering

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IEEE Communications Letters


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ZHENG, G., SURAWEERA, H. and KRIKIDIS, I., 2016. Optimization of hybrid cache placement for collaborative relaying. IEEE Communications Letters, 21 (2), pp.442-445




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