1. A wireless communications device, comprising:
a communication sensitivity checking portion of the wireless communications device configured to check a sensitivity of at
least one communications channel used to communicate with an external access point and to provide a sensitivity signal based
on the checked sensitivity; and
a power mode changing portion of the wireless communications device configured to receive the sensitivity signal from the
communication sensitivity checking portion and to change a power mode of the wireless communications device between a working
mode and at least one sleep mode based on the sensitivity signal received from the communication sensitivity checking portion,
wherein the power mode changing portion is configured to switch the power mode into the working mode once a predetermined
time period elapses after the power mode has been switched to the at least one sleep mode, and wherein a length of the predetermined
time period varies based on a value of a predefined sensitivity value.
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