A new CDMA based 2.5G Network base station power control algorithm for improving user capacity

Abstract

In TDMA and FDMA each user is allocated a unique time and frequency slot. The capacity of these systems has a predefined value; therefore power control has no effect on capacity. In CDMA every mobile user is allowed to transmit on the full available spectrum simultaneously. In this the capacity is defined by the number of users that can be accommodated without losing acceptable QoS. The SIR of all users should not fall below a threshold, so power control in CDMA has a great impact on capacity. In this paper, a new BS Power Control algorithm is proposed for 2.5G network to achieve an average SIR for all users which is above a certain threshold. This algorithm is based on three-valued power update coefficients (≥5, between 2 and 5; and ≤2) and implemented for three static users of a cell at every epoch with 16 iterations for improving user capacity. © 2012 Springer-Verlag GmbH Berlin Heidelberg.