A Master device (Access point /P2P GO device) also needs to contend for the medium as any regular 802.11 station connected to the BSS. There are instances when the Beacon transmission might be delayed due to a delay in obtaining channel access. The connected stations need to wait till a beacon is received by them at Target Beacon Transmission time (TBTT). Most connected Stations – wait a period of 10 milliseconds after TBTT to receive a beacon and term it as a beacon miss if no beacon is received by them in that interval.
The below interval indicates how an Access Point needs to contend for the medium to transmit the beacon frame
Fig Courtesy: 802.11 standard