A base station selection technique for up/downlink in CDMA systems

In order to maintain the communications quality at the target level, signal-to-interference ratio-based power control methods have been proposed in CDMA cellular systems. These power control methods, however, do not necessarily improve system efficiency when there is large deviation in traffic between cells because these methods do not control traffic balance. In this paper, we evaluate the location of cell boundary and the communications quality when a mobile station adaptively selects a base station (BS) in both uplink and downlink under non-uniform traffic. Because of the system asymmetry between the uplink and downlink, the optimum cell boundaries determined by the adaptive BS selection are not always coincident. The location of the cell boundary for the downlink varies according to the loss in orthogonality.