The IEEE 802.15.3 is an ad hoc MAC layer suitable for multimedia WPAN applications and a PHY capable of data rates in excess of 20 Mbps. In 2.4 GHz unlicensed band, IEEE 802.15.3 specifies data rates up to 55 MBPS. It basically employs an ad hoc PAN topology, with roles for \"Master\" and \"Slave\" devices. In this paper, it needs to determine the delay in discovering the devices by Pico Net Controller (PNC) and the most efficient antenna pattern so as to achieve maximum throughput and as a result increase in the QoS. At the beginning of each super-frame, a network beacon is transmitted which carries WPAN-specific parameters, including power management, and information for new devices to join the ad hoc network.