Patent ID: 7876699

Claim:
A mobile station adapted for communicating with an access point, the mobile station comprising: an association module for associating with the access point via an original address and a virtual address of the mobile station; a mode switching module for switching between an active mode and a power saving mode; a verifying module for transmitting a first test frame to the access point, then transmitting a data acquiring frame to the access point to acquire the first test frame, presetting a period of time for receiving the first test frame, and determining whether a time when the first test frame is received is after or before the preset period of time has elapsed, wherein a source address of the first test frame is the virtual address, and a destination address of the first test frame is the original address; and a recording module for recording whether the access point supports Frame Exchange Sequence (FES) to switch between the active mode and the power saving mode according to a determined result of the verifying module.