A novel load balancing algorithm for TD-LTE hierarchical network

In recent years, with rapid development of smart phones and mobile internet, except present 2G and 3G wireless network, TD-LTE representing 4G is being built, which will offer higher spectral efficiency and data rate. To satisfy the requirements resulting from the explosive data which is analyzed as exponentially increasing, while simultaneously reusing Marcos with existing 3G network , TD-LTE has to take a hierarchical architecture in actual network building, namely, allocated frequency band 1.9GHz (called band F) is used as the main band providing continuous coverage while allocated frequency band 2.6GHz (called band D) is used as a secondary one covering hotspot area. For a hierarchical network working on band F and D with different transmitting characters , load balancing between different layers become a very important and complex problem. In this paper, we analyzed three possible configuration types for TD-LTE hierarchical network and then proposed a novel load balancing algorithm. Simulation results show that with the proper architecture, a minimum 33% gain on downlink and 21% gain on uplink can be achieved for cell throughput. Although UE reduction can affect the throughput of the main layer with band F, the average system performance remains increasing under the scenarios of dense urban.