干扰门限与回程容量限制下UDN的能效与谱效联合优化算法

Aiming at the scenarios which consider the constraint of backhaul capacity restriction and interference threshold in ultra-dense networks (UDN), an integer linear programming (ILP) and Lagrangian dual decomposition (LDD) based joint optimization algorithm of energy efficiency and spectrum efficiency was proposed. In the proposed algorithms, the user association problem with the constraint of limited backhaul capacity was modelled as an ILP problem and then finished the connection between the user and the base station of microcell by solving this problem with dynamic programming method. Therefor, Lagrangian dual decomposition (LDD) was applied in an iteration algorithm for spectrum resource allocation and power allocation. The simulation results show that compared with traditional schemes, the proposed algorithm can significantly improve the energy efficiency and spectrum efficiency of system and use the microcell's load capacity more efficiently.