Wireless communication system and method of operating the same for low power consumption of terminal device

The wireless communication system is configured to adaptively change a status report (SR) cycle and a discontinuous reception (DRX) cycle on the basis of a quality of a radio link between a terminal device and a network device. When the quality of the radio link is good, the DRX cycle or the SR cycle is lengthened accordingly, and when the quality of the radio link is poor, the DRX cycle or the SR cycle is shortened accordingly. Furthermore, when the quality of the radio link is good for a long time, the power consumption can be significantly reduced by turning off the terminal device, and after a certain time, turning on the device.