Patent ID: 7899433

Claim:
A method of controlling listening periods in a wireless telecommunications device, the method comprising: setting a first power-saving mode and a second power-saving mode, each of the first and second power-saving modes having a power-saving mode period in which power is saved and data is not transmitted and received, and a standby mode period in which data is transmitted and received; detecting the standby mode periods of the first and second power-saving modes; adjusting a starting period of one of the first and second power-saving modes so that the detected standby mode periods of the first and second power-saving modes overlap in time; and controlling power according to the adjusted one of the first and second power-saving modes and the other one of the first and second power saving modes, wherein the first power-saving mode is classified as a first type in which a sum of the power-saving mode period and the standby mode period is multiplied by a number raised to an exponent, and the second power-saving mode is classified as a second type in which a sum of the power-saving mode period and the standby mode period is fixed.