Cooperative coexistence of heterogeneous wireless sensor networks
Onur Carhacioglu · TU/e Research Portal · 2018
Wireless Sensor Networks have already entered into our lives and they are expected to be even more widespread in the close future.The technologies of the future, such as self driving cars, smart cities, and smart homes require variety of Wireless Sensor Networks standards to operate in the same environment with high reliability.However, if these standards use the same ISM band, the network can suffer from Cross Technology Interference, which can decrease the reliability.The main focus of this thesis is the Cross Technology Interference in 2.4 GHz.2.4 GHz is an unlicensed, therefore highly occupied, ISM band.Efficient use of this band is of foremost importance.The most common 2.4 GHz Wireless Sensor Networks standards are BLE, IEEE 802.15.4,and TSCH.This thesis makes the following contributions.Cooperative coexistence methods for BLE-IEEE 802.15.4,and BLE-TSCH networks are proposed.For heterogeneous BLE-IEEE 802.15.4 network, only time domain rescheduling methods are used.However, for heterogeneous BLE-TSCH network, both time and frequency domain rescheduling methods are discussed.The proposed solutions do not impose any protocol change.They use the MAC layer functions defined in these standards.The proposed solutions are tested using real hardware devices.In these tests, packet reception ratio is used as a performance metric, and energy overhead is used as a cost metric.The overall packet reception ratio improves up to 12 % for BLE-IEEE 802.15.4 network and 45.6 % for BLE-TSCH network.I would like to express my gratitude to my TU/e supervisor Asst.Prof. Majid Nabi for his guidance and encouragement throughout my studies.This thesis could not be written without his constant support and constructive comments.