base station,
Ptk= g(rt,k)PO
where Po is the maximum transmission power. The optimum power functions are transmitted to the Mobile station which calculates the optimal power and starts transmitting at that value. Thus meeting the required QoS parameters.The method and algorithm for optimal power control is detailed in the IEEE paper 503476[[Media:IEEEYao.pdf|Optimal power control law for Multi-media - Multi-rate CDMA systems- Shee Yao and Evaggelos Geraniotis]].
==Conclusion==
Substantial amount of research has been done in the field of QoS in CDMA communication system in the year 1998-99 and this has led to the invention of multitude of methodologies ranging from power control to Rate matching and so on with the sole aim of improving QoS.