Connectivity of ubiquitous sensor network with fixed network

Ad-hoc wireless sensor network allows portable devices to establish communication independent of a central infrastructure within a USN. A lot of sensor nodes can move randomly due to un-centralized infrastructure. But it´s faces numerous routing threats which adversely affect the success of important applications and gather information about physical phenomena. The current method is providing more accurate and more relevant information to fixed network and the existence of numerous independent sensor networks. In this paper we propose the solutions for routing and three methods for gateway detection and it have been implemented and compared. Mobile sensor nodes to establish a connection of gateway. There are several ad-hoc routing protocols, such as DSR, DSDV, ZRP, AODV, TORA etc in this paper we have to need for modification in ad-hoc routing protocols AODV and then we established a communication between a mobile sensor nodes to a gateway. For this purpose we had to use in Network Simulator-2.29, the simulation result show that the AODV protocol can increase the performance of routing in a wireless sensor network fields.