ПОБОЉШАЊА У ЖИВОТНОМ ВЕКУ МРЕЖЕ ЗА СОЛАРНЕ ЧВОРОВЕ У БЕЖИЧНОЈ МРЕЖИ СЕНЗОРСКЕ МРЕЖЕ
IMPROVEMENTS IN NETWORK LIFETIME FOR SOLAR-POWERED NODES IN WIRELESS SENSOR NETWORKS

Summary/Abstract: Wireless sensor networks with specific hardware configuration and possibilities for their network lifetime improvement are examined in this paper. Nodes in the network are equipped with solar cells. Storing solar energy in batteries is a very cost-effective and longlasting solution for sensor nodes that are difficult to reach for regular maintenance. Solar power provides more power for more frequent data acquisition and greater communication distance. The downside of this approach is battery lifetime, not a single charge lifetime but the total overall number of times battery can be recharged before it fails. Here we propose a design of the whole sensor node configuration and, most importantly, hardware and software improvements of sensor nodes for increasing battery life and thus network lifetime. A survey of relevant literature is provided, as wellas the analysis of experimental data from referenced authors. Some experiments have been done to discuss the testing methods of other researchers. Good results in improving network lifetime for most used battery types were obtained by this research. Network lifetime of wireless sensor networks can be doubled or even tripled by modifying battery charging strategies, which would enable up to ten years of maintenance-free operation of sensor nodes. Partial charging strategies present a significant improvement in increasing Li-ion battery cycle-count expectancy and can also increase calendar-life expectancy because of batteries not being kept at elevated states of charge.

• Details
• Contents