Patent ID: 8270607
Filing Date: 2012-09-18
Classification: H04L,H04W

Abstract:
1. A method of protecting a broadcast frame, the method comprising: broadcasting a beacon and a maintenance beacon frame (MBF) from an access point (AP) to a plurality of terminals during a maintenance beacon waiting period (MBWP); broadcasting broadcast management frames (BMFs) from the AP to the plurality of terminals during a broadcast management frame waiting period (BMFWP); checking whether a time synchronization is performed during a previous beacon interval; and extracting a previous key of a previous key field of the MBF and checking whether the previous key belongs to a hash chain and corresponds to the previous beacon interval when the time synchronization is not performed during the previous beacon interval, wherein the MBF comprises a BMFs message integrity code (MIC) field including a BMFs MIC calculated from concatenated BMFs to be sent in a current beacon interval.