Distributed Pricing-Based User Association for Downlink Heterogeneous Cellular Networks

摘要: This paper considers optimization of the user and base-station (BS) association in a wireless downlink heterogeneous cellular network under proportional fairness criterion. We first consider case where each BS has single antenna transmits at fixed power propose distributed price update strategy for pricing-based scheme, which users are assigned to based on value utility function minus price. The proposed algorithm is coordinate descent method solving dual maximization problem it rigorous performance guarantee. main advantage as compared an existing subgradient that independent parameter choices can be implemented asynchronously. Further, this joint control proposes iterative significantly outperforms approaches. Finally, beamforming BSs equipped with multiple antennas spatially multiplex users. incorporate weighted minimum mean-squared error (WMMSE) show achieves nearly same computationally more complex benchmark (which applies WMMSE entire association) while avoiding excessive handover.