Performance evaluation of dynamic point selection CoMP scheme in heterogeneous networks with FTP traffic model

摘要

High traffic demand is considered as one of the key challenge in modern wireless communication systems which are typically limited by amount of available spectrum. Recently heterogeneous networks (HetNet) have been proposed as an attractive approach to cope with this problem, by enabling cell splitting gain via deployment of an additional layer of pico-cells. While low power and small antenna height of pico-cell base stations simplify search of the site location, the efficiency of cell splitting gain in HetNet is typically limited by small coverage area of pico-cells. To address the issue of HetNet performance in LTE-A Rel-11, coordinated multipoint (CoMP) traffic management schemes were considered. In particular a combination of dynamic point selection (DPS) with dynamic point blanking (DPB) was identified as a promising mechanism to provide cell load balancing and interference mitigation in HetNet. Dynamicity of CoMP schemes is expected to provide performance benefits in various scenarios including non-full buffer traffic models, where scheduling decisions of DPS/DPB can be based on the instantaneous cell's loading conditions. In this paper we provide detailed system level performance analysis for DPS/DPB CoMP scheme in HetNet scenario with non-full buffer FTP traffic model. The performance results are conducted for different traffic loadings of the cells and DPS/DPB scheduling decision granularities.