Monitoring the Delay and Directivity of Antennas in Gigabit WPAN (802.15.3c)

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 work, 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. PNC sends beacons to various devices and the device, which accepts the beacon, sends an acknowledgment frame to PNC. When the devices are connected to PNC, the piconet is formed through which PNC and devices can communicate with each other. For the performance assessment of the wireless networks using antennas, baseline models of directional antenna and isotropic antennas have been developed using the simulator OPNET Modeler 12.0. The code developed is to be such that, it can be easily extended to a real time implementation. From the results of the simulation it is observed that although the models with isotropic antennas have good throughput, the maximum is achieved by using directional antenna models. Moreover, use of directional antennas at transmitter and receiver decreases in end-to-end delay. For simulation, licence version of OPNET Modeler 12.0 is used. Keywords— PNC, QoS, piconets, DEVs, throughput