Optimizing Content Caching to Maximize the Density of Successful Receptions in Device-to-Device Networking

Abstract

Device-to-device (D2D) communication is a promising approach to optimize the utilization of air interface resources in 5G networks, since it allows decentralized opportunistic short-range communication. For D2D to be useful, mobile nodes must possess content that other mobiles want. Thus, intelligent caching techniques are essential for D2D. In this paper we use results from stochastic geometry to derive the probability of successful content delivery in the presence of interference and noise. We employ a general transmission strategy where multiple files are cached at the users and different files can be transmitted simultaneously throughout the network. We then formulate an optimization problem, and find the caching distribution that maximizes the density of successful receptions (DSR) under a simple transmission strategy where a single file is transmitted at a time throughout the network. We model file requests by a Zipf distribution with exponent ${\gamma }_r$, which results in an optimal caching distribution that is also a Zipf distribution with exponent ${\gamma }_c$, which is related to ${\gamma }_r$ through a simple expression involving the path loss exponent. We solve the optimal content placement problem for more general demand profiles under Rayleigh, Ricean and Nakagami small-scale fading distributions. Our results suggest that it is required to flatten the request distribution to optimize the caching performance. We also develop strategies to optimize content caching for the more general case with multiple files, and bound the DSR for that scenario.

arXiv commentpublished in IEEE Transactions on Communications, 2016

References in corpus (8)

• A Tractable Approach to Coverage and Rate in Cellular Networks
• Optimal Geographic Caching In Cellular Networks
• Spectrum Sharing for Device-to-Device Communication in Cellular Networks
• Wireless Device-to-Device Caching Networks: Basic Principles and System Performance
• SINR-based k-coverage probability in cellular networks with arbitrary shadowing
• Asymptotic Laws for Joint Content Replication and Delivery in Wireless Networks
• Wireless Multihop Device-to-Device Caching Networks
• Coding for Caches in the Plane

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• Markov Decision Policies for Dynamic Video Delivery in Wireless Caching Networks
• Cost-optimal caching for D2D networks with user mobility: Modeling, analysis, and computational approaches
• A Caching Strategy Towards Maximal D2D Assisted Offloading Gain
• On Consideration of Content Preference and Sharing Willingness in D2D Assisted Offloading
• Modeling, Analysis, and Optimization of Coded Caching in Small-Cell Networks
• Stochastic Design and Analysis of Wireless Cloud Caching Networks