Localization plays a very prominent role in WSNs. It is essential because if one node contains information placid from physical entity to transfer and the location of other node which is meant to receive is not known then the information gathered becomes feckless. The basic idea in localization involves placing GPS in each and every node in the network to know its location. It results in increase of cost which is not a desirable feature. Moreover the efficiency of GPS is not Satisfactory in monitoring indoor applications. In localization, the distance between nodes is essential which will be further calculated by using RSSI method. RSSI is adopted in many of the localization algorithms because of its low cost and simplicity. In ranging mechanism, Classical Trilateral algorithm is considered but it results distance errors due to instability in equations.The proposed mobile aided Trilateral method results in increasing the network lifetime, reducing the time of estimation, improving the signal strength besides minimizing the energy consumption of nodes. In this method the mobile node moving in random manner gathers the information of neighbouring nodes which will be further useful in Trilateral minimum condition method to localize the unknown nodes position.In this method the distance calculations are performed by mobile node resulting in the minimization of energy usage and distance error associated with neighbouring nodes. As a result the proposed mobile aided method produces the best results in case of signal strength and life time of network when compared to previous Classical Trilateral methods.

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