Wireless sensor network (WSN) deploys tiny wireless sensor nodes to communicate with each other with limited processing speed, power and security measures. A recent WSN routing protocol defined as Secure Real-Time Load Distribution (SRTLD) has been developed to provide realtime transfer, high delivery ratio, and longer sensor node lifetime. However, SRTLD uses broadcast packets to perform neighbor discovery for every packet transfer every hop, thus consume high energy.

In this paper we have presented the improved ACO algorithm that has been utilized in BIOSARP to perform self-optimized routing in WSN. BIOSARP has been studied and verified through simulation in network simulator 2 (NS-2). In simulation study BIOSARP normalized overhead is 12.1% less as compare to E&D ANTS and achieves 14% higher delivery ratio with 9% less power consumption when compared to SRTLD.

Wireless Sensor Networks (WSNs) is one of the core technologies to contribute in the next generation networks (NGNs). WSN consists of numerous miniaturized low cost wireless sensor nodes with limited power, processing capability and data storage. Applications like medical care, battlefield surveillance, fire detection, structural and environmental monitoring can be benefited from wireless sensor nodes that communicates in multihop manner to collect and transfer the required data to the given destination.