A method for operating an access point (AP) includes scheduling, by the AP, first resources for a first periodic restricted access window (PRAW), and generating, by the AP, a first PRAW indicator including first information associated with the scheduled first resources for the first PRAW. The method also includes determining, by the AP, a next PRAW indication time in accordance with the first PRAW, and transmitting, by the AP, the first PRAW indicator and the next PRAW indication time in a first frame.