Chapter 10: D2D Caching Fundamentals

Learning Objectives

• Define the D2D (device-to-device) caching network where users are both transmitters and receivers
• State the Ji-Caire-Molisch scaling law: per-user throughput scales as $\Theta(M/N)$ for random demands
• Understand why D2D caching converts local traffic into a globally distributed library
• Analyze the asymptotic throughput scaling as network size $n \to \infty$
• Compare D2D + caching with infrastructure-based (base station) delivery
• Characterize the random-geometric-graph model assumptions underlying the scaling law