Performance improvement in wireless sensor and actor networks based on actor repositioning

Wireless sensor and actor network is a heterogeneous network in which actor nodes enjoy higher capabilities of sensing, transmitting, and processing. The collaboration of actor nodes with the sensor nodes has significant advantages compare to traditional sensing. Actor nodes take accurate decisions and appropriate actions based on the collected data by sensor nodes, and also reposition themselves to nearby event region. In Wireless Sensor and Actor Networks (WSAN), sensor nodes are larger in quantity with lesser capabilities and actor nodes are very few but have higher capabilities. Actor nodes are responsible for taking a localized decision which requires strong cooperation among neighboring actor nodes. Therefore, appropriate placement of actor nodes in WSAN is very important and it needs proper attention to cover larger region, reduce communication delay, and get better load balancing among actor nodes. However, in some applications this may not be possible as sensor networks are deployed on run time. Moreover, accurate deployment is difficult at the time of network establishment. After event detection sensor nodes inform the nearest actor node through multihop communication. To get better performances like low energy consumption by sensor nodes and better network life time, actor nodes must be repositioned near to the event region. In this paper we have introduced a novel mechanism for getting better network lifetime, low energy consumption, minimum delay, and high throughput through proper repositioning of actor nodes. In this paper an actor can find suitable coordinates for repositioning itself or some other actor based on Euclidean distance, energy of the region and number of nodes.