DRXn where n = {2, 3, …, 9}. DRX7 is the most common selected by the service

providers. The receiver active ON time is less than 6 milliseconds for GSM and depending on signal processors can be between 1 msec and 20 msec for WCDMA. Smaller DRx cycle reduces standby battery life. Longer DRx cycle results in longer time before cell phone first ring with more ring back cycles to call originator. During the deep sleep mode the system clock is off.

For GSM n = DRx cycle = n * (15*8*51)/26 milliseconds

e.g.: DRx2 = 2 * (15*8*51)/26 = 470.769 msec DRx3 = 706.154 msec DRx4 = 941.538 msec

DRx5 = 1.176923 seconds (commonly used for GSM systems)

DRx6 = 1.412308 seconds DRx7 = 1.647.692 seconds DRx8 = 1.883077 seconds DRx9 = 2.118462 seconds

For WCDMA k = DRx cycle=> DRx(k) = 2^

k

* 0.01 seconds

e.g. K= 2 = 2^2 * 0.01 = 40 mses K= 3 = 80 msec K= 4 = 160 msec K= 5 = 320 msec K= 6 = 640 msec K=

7 = 1.28 seconds (commonly used for WCDMA systems)

K= 8 = 2.56 seconds K= 9 = 5.12 seconds