PRM - Private Interference Discovery for IEEE 802.15. 4 Networks
Dominik Roy George, Savio Sciancalepore · 2022
Due to the mobile and pervasive nature of IoT networks, even more frequently, multiple IoT networks managed by different network administrators share the same spectrum and operate in the same area, leading to packet losses and degradation of the Quality of Service (QoS). Assuming the use of the widespread IEEE 802.15.4 communication technology, the most straightforward solution would be to allow the networks to share the local Radio Scheduling Table (RST) to optimize channel access. However, exchanging the RST can leak several key information, such as the topology of the network, the number of devices, and the channel access patterns. To address such problems, we present PRM, the first scheme for discovering in advance potential interferences among IEEE 802.15.4 networks, without exposing the whole RST to untrusted parties. Our solution adapts a protocol for Private Set Intersection, while combining it with an innovative iterative set division algorithm, making the whole solution feasible on constrained devices of the IoT domain. Our experimental performance assessment, carried out on heterogeneous devices, shows that PRM can discover colliding channel assignments in less than 1 sec. on more capable embedded devices (e.g., the Raspberry PI), while also being feasible for more constrained platforms (e.g., the ESPCopter), depending on the amount of used radio resources.