WEIGHTED RENDEZVOUS PLANNING FOR MILITARY BASED WIRELESS SENSOR NETWORKS.

Abstract

Wireless sensor network (WSN) consists of a large number of sensor nodes deployed in a wide area. WSN is used for the monitoring and collection of data about the physical conditions of the environment. Unlike traditional WSNs, a military-based large size sensor network possesses unique requirements/challenges in terms of surveillance widespread areas that are indeed harder to monitor, self-configuration, coverage, connectivity, and energy dissipation. Sensor nodes sense data and send it to special nodes called a sink. Sensor nodes are powered with a non-rechargeable battery. Minimizing the energy consumption of the node to prolong network lifetime is a critical issue. Several studies have demonstrated the benefit of using a mobile sink to reduce the energy consumption of nodes. To manage the above issues researchers introduced a Rendezvous design technique, where some sensor nodes are selected as a Rendezvous Point (RP) and the nodes which are not RP's will forward data to the nearest RP's. However, the major issue in this design is to select RP's and determine the tour length that visits these RP's. This paper proposed a scheme called the Weighted Rendezvous Planning (WRP) method for militarybased application, whereby each sensor node is assigned a weight corresponding to its hop distance from the tour and the number of data packets that it forwards to the closest RP. The simulation is performed using NS2 simulator,  results demonstrate that WRP enables a mobile sink to retrieve all sensed data within a given deadline while conserving the energy expenditure of sensor nodes