Simulate Mobile Adhoc Network with Directional Antenna.|| WSN Practical 5 скачать в хорошем качестве

Simulate Mobile Adhoc Network with Directional Antenna.|| WSN Practical 5

MANET stands for Mobile Adhoc Network also called a wireless Adhoc network or Adhoc wireless network that usually has a routable networking environment on top of a Link Layer ad hoc network.. They consist of a set of mobile nodes connected wirelessly in a self-configured, self-healing network without having a fixed infrastructure. MANET nodes are free to move randomly as the network topology changes frequently. Each node behaves as a router as they forward traffic to other specified nodes in the network. Mobile ad hoc networks are typically assumed to be equipped with omnidirectional antennas. However, it may be possible to improve the network capacity by using directional antennas effectively. Although recent research activity has addressed some of the problems related to directional medium access, the impact of directional antennas on the performance of higher-layer protocols has not been adequately explored. As evident from subsequent sections of the paper, the impact of directional communication on the performance of an ad hoc network is often counterintuitive. While fewer hop routes may be discovered due to the higher transmission range of directional antennas, performing a simple neighborhood broadcast may now require the antenna system to sweep its transmitting beam sequentially over multiple directions. As a result, neighbors of a node receive broadcast packets at different points of time (unlike omnidirectional antennas). Also, sweeping incurs greater delay and can incur higher control overhead, partially negating the advantages derived from reducing the hop count of discovered routes. More subtle tradeoffs arise from directional medium access control. A routing protocol that remains unaware of the underlying changes can degrade system performance significantly. To study such tradeoffs, we evaluate the performance of an omnidirectional routing protocol (DSR) using directional antennas. In addition to these discussed issues, the energy consumption of directional antennas may also be of interest. In this paper, we do not evaluate the tradeoffs associated with energy consumption—this is a part of our future work. The contributions of this paper include identifying connectivity, delay, and throughput issues associated with directional routing, optimizations to address some of these issues, and a new metric to evaluate the control overhead of routing protocols. @Recorded by Shardanand Jha #wsn #wireless #wirelessensorsnetwork #sensor