부산대학교 도서관

Wireless operators worldwide are struggling with network congestion following explosion of mobile data traffic over the last several years. In many countries, spectrum addition is not an option. Improvement in spectral efficiency is not keeping up with traffic growth. Hence, the only option to add network capacity is to re-use existing spectrum. However, in many large cities, inter-site distances among macro cells are reaching the lower bounds of practical deployment, thereby forcing the industry to explore alternative network architectures. Heterogeneous Networks (HetNets) are defined as a mix of multi-technology macro and Small Cells. Small Cells may be used in licensed and/or unlicensed spectrum bands. There are three primary challenges of deploying Small Cells: (1)Where to deploy them so that maximum traffic is captured, (2)How to minimize interference with macro cells and (3)How to minimize deployment costs. This paper discusses a methodology for balancing the three constraints in a real-life network.