Impact of outdated antenna selection on cache-aided UAV relay networks

Abstract

In this work, we analyze the effects of outdated antenna selection on cache-aided unmanned aerial vehicle (UAV) relay networks, where the UAV acts as a decode-and-forward (DF) relay. More precisely, the transmitter communicates with destination, assisted by a UAV relay equipped with a cache, which can provide ultra-reliable and low-latency services. We firstly propose two antenna selection criteria to choose the best transmit antenna among M antennas for acquiring the maximal channel gains of direct and relaying links, respectively. Then, both analytical and approximate expressions of the outage probabilities are derived for the considered networks to evaluate the impacts caused by outdated channel state information (CSI). Moreover, the experimental results verify our analysis, while showing that the concerned cache-aided UAV relay networks provide much better services of ultra-reliable and low-latency than the one without cache.