Caching and Placement for In-Network Caching in Device-to-Device Communications

Somayeh Soleimani,Xiaofeng Tao

doi:10.1155/2018/9539502

Abstract

Caching content by users constitutes a promising solution to decrease the costly transmissions with going through the base stations (BSs). To improve the performance of in-network caching in device-to-device (D2D) communications, caching placement and content delivery should be jointly optimized. To this end, we jointly optimize caching decision and content discovery strategies by considering the successful content delivery in D2D links for maximizing the in-network caching gain through D2D communications. Moreover, an in-network caching placement problem is formulated as an integer nonlinear optimization problem. To obtain the optimal solution for the proposed problem, Lagrange dual decomposition is applied in order to reduce the complexity. Simulation results show that the proposed algorithm has a near-optimal performance, approaching that of the exhaustive search method. Furthermore, the proposed scheme has a notable in-network caching gain and an improvement in traffic offloading compared to that of other caching placement schemes.

Highlights

The recent explosion in the number of smart mobile devices and new applications has caused data traffic to rise sharply, which challenges the capacity of network infrastructure
This work presents a distributed caching mechanism and maximal cellular traffic offloading with D2D communications, it does not address the success of content delivery over a D2D link sufficiently
We describe a joint design of caching decision and content discovery strategy to improve the performance of in-network caching in D2D communications

Summary

Introduction

The recent explosion in the number of smart mobile devices and new applications has caused data traffic to rise sharply, which challenges the capacity of network infrastructure. This work presents a distributed caching mechanism and maximal cellular traffic offloading with D2D communications, it does not address the success of content delivery over a D2D link sufficiently. Joint optimization of caching and discovery, with consideration of successful content delivery among devices, is crucial for improving the performance of D2D caching network. We describe a joint design of caching decision and content discovery strategy to improve the performance of in-network caching in D2D communications. We model the in-network caching placement as a joint optimization problem of caching decision and content discovery strategy by deriving the probability of success for a content delivery to maximize in-network caching gain.

Related Work

System Model and Successful Content Delivery Criterion

In-Network Caching Placement and Problem Formulation

Duality-Based In-Network Caching Placement

Simulation Results

Conclusion