This power index will ascertain the optimal power to be alloted to each service channel.<br>
'''Pi = (gi*No*W )/ (Hi*(1-(Sgj)'''<br>
where No is AWGN(Additive White Guassian Noise)a constant,<br> Hi is path loss which is dependent on the distance and is a costant for a path,<br> and Sgj is sum of the power index of all the sessions which is constant for all sessions of the radio frame. <br> From the above analysis, we observe that Bit Rate the bit rate is inversely proportional to Spreading the spreading factor which will inversely effect the power index and hence the optimal power. Therefore, the Bit Rate and Optimal power go hand in glove hand, and have the same effect on Eb/I and QoS. The method and algorithm to schedule optimal power is detailed in the IEEE paper '''[[Media:IEEEGurbuz.pdf|Dynamic Resource Scheduling for Variable QoS Traffic in W-CDMA - Ozgur Gurbuz, Henry Owen''']]. Thus , we conclude that by adjusting the optimal power we are actually trying to implement a rate matching step.[[Media:IEEE1.pdf]]
===Power control and QoS===