Patent ID: 8437701

Claim:
A method for acquiring a frequency difference, the method comprising: acquiring a difference T 1 between clock timing before dormancy and clock timing of a base station; recording a dormancy period T between dormancy start and dormancy end; acquiring a difference T 2 between clock timing after dormancy and clock timing of the base station; and computing a frequency difference between a low speed clock and a base station clock, wherein computing the frequency difference comprises: performing a subtraction operation using the difference T 2 and the difference T 1 to obtain a phase offset within the dormancy period T; dividing the phase offset by the dormancy period T to obtain a frequency difference ratio; and multiplying the frequency difference ratio with a normalized frequency of the low speed clock to obtain the frequency difference between the low speed clock and the base station clock, or multiplying the frequency difference ratio with a normalized frequency of the base station clock to obtain the frequency difference between the low speed clock and the base station clock.