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Recently, wireless edge caching has been emerged as a promising technologyfor future wireless networks to cope with exponentially increasing demands forhigh data rate and low latency multimedia services by proactively storingcontents at the network edge. Here, we aim to design efficient cache placementand delivery strategies for an orthogonal frequency division multiple access(OFDMA)-based cache-enabled heterogeneous cellular network (C-HetNet) whichoperates in two separated phases: caching phase (CP) and delivery phase (DP).Since guaranteeing fairness among mobile users (MUs) is not well investigatedin cache-assisted wireless networks, we first propose two delay-based fairnessschemes called proportional fairness (PF) and min-max fairness (MMF). The PFscheme deals with minimizing the total weighted latency of MUs while MMF aimsat minimizing the maximum latency among them. In the CP, we propose a novelproactive fairness and transmission-aware cache placement strategy (CPS)corresponding to each target fairness scheme by exploiting the flexiblewireless access and backhaul transmission opportunities. Specifically, wejointly perform the allocation of physical resources as storage and radio, anduser association to improve the flexibility of the CPSs. Moreover, In the DP ofeach fairness scheme, an efficient delivery policy is proposed based on thearrival requests of MUs, CSI, and caching status. Numerical assessmentsdemonstrate that our proposed CPSs outperform the total latency of MUs up to27% compared to the conventional baseline popular CPSs.

Fairness and Transmission-Aware Caching and Delivery Policies in OFDMA-Based HetNets