Fast cell site selection with interference avoidance in packet based OFDM cellular systems

Abstract

In this paper, we consider fast cell site selection (FCS) in the downlink of a packet based orthogonal frequency division multiplexing cellular system. Mobile stations near the cell boundary can have opportunities to encounter a link that can provide better condition than the link in service due to the nature of fading effect. Conventional FCS schemes can track the variation of channel fading, exploiting a site selection diversity gain. However, mobile stations near the cell boundary may suffer from other cell interference (OCI) which is highly time-varying and unpredictable. To mitigate the OCI effect, we propose a new FCS scheme that exploits cell selection diversity while preventing adjacent cells from using the same sub-channels. We also consider the selection of candidate cells. The performance of the proposed FSC scheme is analyzed in terms of the capacity using an upper bound. Finally, analytic results are verified by computer simulation.