System frame number (sfn) evaluator

When continuously counter passing time and calculating passing time difference exceeds the threshold value the access terminal again to obtain the system frame number sfn. Through the access terminal sleep mode period and keep the movement of the continuous counter to generate continuous counter passing time and calculating passing time base according to the sleep state period stopping using the continuous counter the counter value is derived sfn. On one side successive counting device can be used in the sleep mode period is composed of a continuous clock which is used as clock but not continuous counter can be used by the sleep mode period which is used for stopping is fast the clock which is used as clock. The sleep mode after the weight of activated during the counting device is set the time of the discontinuous counter is set with the continuously counting device with the indication of sfn corresponding to the reset of the counter value.