The communication range of devices in a wireless ad hoc network is inherently limited, but it can be enhanced by interconnecting it to a wired network like the internet, thus forming a hybrid wireless network. This interconnection to improve scalability has been achieved by using gateways, which brings the biggest overhead in WANET accessing Internet. So a mobile node in WANET has to find a route to a gateway first to communicate with the Internet host. It requires an efficient gateway discovery mechanism. The discovery and selection of Internet gateway are one of the key challenges to provide inter-connectivity. The gateway discovery mechanisms called proactive, reactive and hybrid are developed to enable mobile nodes to register with internet gateways. But the performance of the network largely depends on the gateway discovery method used and it can be analyzed using various performance metrics such as packet delay, throughput, routing overhead, Bandwidth efficiency etc. This paper focuses on various issues for WANET-Internet integration and their proposed technical solutions by various researchers for different Internet gateway discovery mechanisms to improve the performance.
The adhoc networks are considered to be infrastructure less networks therefore the scarcity of resources (i.e. Bandwidth and Energy) are the main issues requiring attention.In this paper the routing applications/algorithms for optimizing battery life time are analyzed while taking into account the highly unreliable real time behavior of mica2 motes. Routing applications are run in Matlab based probabilistic event driven platform having layered architecture for power centric radio model. Although the adhoc networks have dynamic topology and are randomly placed in specified environments, radio motes are placed in a twodimentional virtual grid for simulating the flow of packet information in a multicasting source-destination domain. Power Efficient Wireless Adhoc Networks have their applications in military (spying, battlefield surveillance), environmental (forest fire and flood detection, seismic structure response and bio-complexity), health (drug administration in hospitals) set ups.
Many Computer Vision and Machine Vision researchers are working very hard to connect the world together by enhancing the standards of wireless communication. In this concept of globalization, Wireless ad hoc networks (WANET) plays an important role due to their infrastructure less and autonomous attributes. In this paper we presented a concept of auto assignment of addresses to ad hoc nodes for allowing efficient duplex communication with corresponding nodes of infrastructure based network. To work with heterogeneous network of nodes, we consider four different wireless networks for the purpose of simulation. These networks are WiFi, ZigBee, UMTS and Satellite network. We analyze the performance of IPv6 based addressing over IPv4 based addressing for mobile nodes on the basis of parameters Average Packet Drop (APD), Delay, Routing Overhead (RO), Packet Receiving Rate (PRR) with respect to simulation time. In our study we found the improved performance of IPv6 based addressing over IPv4 based addressing when communicating in between network containing networks of different standards.
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