01485nas a2200133   4500008004100000245007900041210006900120260001800189520095100207100002101158700002201179700002601201856012401227       2021                        eng d00aExploring the energy efficiency for Search and Rescue operations over LoRa0 aExploring the energy efficiency for Search and Rescue operations  cApril 19 - 213 aThe Internet of Things (IoT) is one of the pioneering domains of Computer Science and Engineering, that comes to solve a plethora of real-life problems. One of the most promising technologies that aim to provide long-distance transmission while retaining energy consumption at low levels, is Long Range (LoRa). In this paper, a thorough study of the energy efficiency in LoRa based Search and Rescue (SAR) project for people with special needs, called Wearable based Search And Rescue system (WeSAR) is presented. After research the authors propose a LoRa based system, taking into consideration the energy efficiency. The results of the proposed mechanism are encouraging in terms of energy consumption, and the battery can last enough for the majority of the SAR operations, even when the battery is not fully charged. Also, there is no deterioration in terms of the delivery ratio of the network which is important for localization algorithms.1 aBouras, Christos1 aGkamas, Apostolos1 aKatsampiris, Spyridon  uhttp://telematics.upatras.gr/telematics/publications/exploring-energy-efficiency-search-and-rescue-operations-over-lora