in accordance with embodiments of the invention , in a wireless local area network configured in accordance with the hiperlan type 2 standard where an access point and mobile terminals use a duplex airlink having a mac frame structure to communicate with each other , when an mt fails to properly perceive and decode a wakeup announcement in the mac frame that is directed to it by the ap , the mt will remain awake and continue to decode and monitor subsequent mac frames until it either receives a wakeup announcement directed to it , or until a predetermined number of mac frames transpire . where the mt fails to correctly decode a wakeup announcement and / or fails to send an acknowledgment signal back to the ap when the wakeup announcement includes a polling request , the ap will continue to resend the wakeup announcement and any appropriate , associated downlink data pending for the ap , in subsequent mac frames . the ap continues until either the mt correctly receives the wakeup announcement and responds appropriately , or until a predetermined number of mac frames expire .