Localization Technique in Wireless Sensor Network

. Localization is a fundamental issue of wireless sensor networks. Localization in wide areas remains very challenging due to various interfering factors. Combined& Differentiated Localization approach that exploits the strength of range free approaches and range-based approaches using received signal strength indicator. A critical observation is that ranging quality greatly impacts the overall localization accuracy. To achieve a better ranging quality virtual-hop localization is used. For the first phase of CDL, virtual-hop localization initially computes node locations. This is an enhanced version of hop count- based localization. Virtual-hop particularly addresses the issue of non uniform deployment. The data transfer takes place between the network by using IP address. External Agents an IP-based host. An EA node is a full-fledged computer with full TCP/IP networking stack or IP network. Sensor Nodes provide data that is requested by EA. . It has both IP network stack and DD sensor network capability. Data returned by sensor nodes is also processed and forwarded by gateway node to IP-based hosts. The data transfer between the nodes is not assured full data packet transfer to the destination due to various factors such as heavy load information, source-destination length. To overcome this drawback load balancing algorithm is implemented.