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Energy Efficient Resource Sharing in Multi-Operator Heterogeneous Cloud RAN

In this paper, we consider a multi-operator heterogeneous cloud radio access network, where operators share their small cells. A formulation for the energy efficiency of the shared network is suggested and an energy-efficient resource allocation algorithm is proposed for the user assignment and power allocation in the multi-operator network. The problem is formulated as a mixed-integer optimization problem and solved using Lagrange Dual Decomposition method. Numerical results proved the benefits of sharing in terms of network energy efficiency, power consumption and users satisfaction. It also showed the efficiency of the proposed algorithm in achieving additional power saving in a multi-operator Heterogeneous Cloud RAN.