Multi-Hop CT-LoRa Technology



LoRa, a sub-GHz low-power wide-area (LPWA) technology, can achieve a remarkable transmission range by exploiting the chirp spread spectrum (CSS) technology. However, the current LoRa network which adopts single-hop star topology greatly weakens its penetration power in indoor environments. In this research, we strive to construct the CT-LoRa network – a multi-hop LoRa network based on the highly efficient concurrent transmission (CT) protocol to provide an omnipresent indoor coverage. In addition, in order to further improve the network utilization, we are studying a smart SF assignment strategy which exploits the orthogonality between different SFs and performs parallel transmissions to offload the data traffic into multiple subnets. Moreover, we carry out large-scale prototyping experiments over several buildings to prove that the CT-LoRa is able to construct a robust multiple-building-area network (MBAN), which can become the backbone of many important IoT applications, such as energy management and surveillance control systems.