Abstract
The rapid growth of mobile data traffic demand will cause congestion to the future communication network. The cache-enabled device-to-device communication has been proven to effectively enhance the performance of wireless communication networks. This article investigates the caching deployment problem from the energy efficiency in the cache-enabled device-to-device networks. According to the random geometry theory modeling, the closed form expression of energy efficiency is derived, which measures the average number of successful transmitted file bits per unit time and per unit power consumption. And then we establish an optimization problem to maximize energy efficiency. As the formulated optimization problem is a multiple-ratio fractional programming problem that cannot be solved conveniently, we propose a quadratic transformation method to nest in the energy efficiency maximization problem. To tackle this problem, an iterative optimization algorithm is proposed to optimize the caching policy and network energy efficiency. The simulation results demonstrate that the proposed policy can achieve higher energy efficiency and hit probability in the cache-enabled device-to-device network.
Highlights
The demand for video delivery services has dramatically increased, which promotes the exponential growth of wireless data traffic.[1,2,3] conventional solutions like the ultra-dense network with increased base station (BS) deployment density, the millimeter-wave communication using higher frequency spectrum communication, and the multiple input multiple output (MIMO) technology cost too much and have reached their limits.[4]
Since device-to-device (D2D) communication can directly communicate with nearby user equipments (UEs) without data forwarding through the BSs, as a result, D2D communication has attracted widespread attention in recent years.[6,7,8]
We propose a novel D2D caching policy for the content-related EE in the D2D communication network
Summary
The demand for video delivery services has dramatically increased, which promotes the exponential growth of wireless data traffic.[1,2,3] conventional solutions like the ultra-dense network with increased base station (BS) deployment density, the millimeter-wave communication using higher frequency spectrum communication, and the multiple input multiple output (MIMO) technology cost too much and have reached their limits.[4] new paradigms need to be studied to enhance the performance of traditional cellular network architecture.[5] Since device-to-device (D2D) communication can directly communicate with nearby user equipments (UEs) without data forwarding through the BSs, as a result, D2D communication has attracted widespread attention in recent years.[6,7,8] From a practical perspective, the storage of UEs is growing rapidly at low cost Inspired by these facts, the cacheenabled D2D communication was proposed in Golrezaei and colleagues[9,10] to offload more transmitted data traffic.
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