Review Over Hole Healing Techniques in Wireless Sensor Networks

Improving coverage and connectivity is a very important issue in wireless sensor networks. The unattended or uncovered region in a sensing field is called a coverage hole. A coverage hole impacts the performance of the wireless sensor network, disconnects the network topology and causes delay in data transmission. These coverage holes can be healed randomly or each hole can be assigned a priority value for healing. In this paper we will discuss about various hole healing strategies and their mechanism