Coordinated downlink multi-point communications in heterogeneous cellular networks

A. Barbieri, P. Gaal, S. Geirhofer, T. Ji, D. Malladi, Y. Wei, F. Xue
2012 2012 Information Theory and Applications Workshop  
In this paper we assess how coordination among base stations can be exploited to improve downlink capacity in fourth generation (4G) cellular networks. We focus on heterogeneous networks where low-power pico cells are deployed within the coverage area of an existing macro network with the aim of offloading traffic from the (potentially congested) macro cells to low-power cells. Firstly, we describe an enhanced inter-cell interference coordination scheme which is shown to achieve a significant
more » ... pacity gain in such deployments by leveraging a loose coordination among neighbor base stations. Secondly, we explore how a tighter coordination among base stations can be exploited to further improve the network capacity. Even though the schemes described in this paper apply to long term evolution (LTE) wireless networks, we point out that most of the findings and conclusions we draw apply to any cellular network. 1 An interesting exception is the case where the number of TX and RX antennas can be significantly increased. For mobile devices with size constraints, this is only suitable at higher frequency band, which is only usable for small cells due to physical propagation limitation 2 The two main differences between a macro BS and a pico BS are the transmission power, which is typically 10-20dB lower in pico BS [6] , and the antenna height and gain. Furthermore, pico BSs may have reduced equipment size, reduced power consumption (leading to a reduced OPEX), and sometimes a reduced set of features (e.g., fewer number of supported concurrent users).
doi:10.1109/ita.2012.6181826 dblp:conf/ita/BarbieriGGJMWX12 fatcat:3odeexf6pvbkzeg6jopqwiryh4