Iterative Multi-Level Level Soft Frequency Reuse With Load Balancing for Heterogeneous LTE-A Systems
Abstract: This paper deals with the planning of two two-layer long-term term evolution evolution-advanced cellular systems, taking both the co co-tier and cross-tier tier interference into account. In particular, we propose the novel multi-level multi level soft frequency reuse (MSFR) scheme, where the users in three different regions of a macro/micro cell adopt distinct frequency segments and different transmission power levels. The optimization off power control parameters and cell association with MSFR results in a non-convex convex problem. We present the iterative-MSFR iterative (I-MSFR) MSFR) scheme, where the main optimization problem is divided into two sub-problems sub problems that can be subsequently solved by means of class classical ical optimization methods. Finally, we propose two simplified schemes that achieve a comparable performance as II MSFR in terms of utility, cell capacity, and outage conditions. II-MSFR and the simplified schemes have shown better performance than other schemes sche in the literature.