Simulation and Analysis of Bluetooth Low Energy Packet Collisions (Masterthesis)
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Radio-frequency based wireless networks are used in industrial, personal/civilian and medical applications. Recent research compared different available technologies in respect to various technology and design parameters. Bluetooth Low Energy is an emerging wireless technology for wireless sensor networks, with a focus on low-cost and low-power. It is already actively analyzed in respect to various parameters, e.g. connection setup latency and power consumption. In this thesis the effects of interference between Bluetooth Low Energy devices is researched in detail. To achieve this a simulator for advertising and data channel packets was developed and verified. Finally, it was compared to an analytical model for advertising packet channel collisions. Simulation results show that packet collisions are quite relevant in advertising. Already very few advertising devices, e.g. 4, can reach up to 9% packet loss depending on their configuration; for 128 advertisers the packet loss is already up to about 98%. Data channel packets collision are not as likely, but still relevant depending on the number of connections and usable data channels. For a lower amount of connections the packet loss might be negligible with up to 1.9% (8 connections), but in crowded networks collisions can contribute to a packet loss of up to 28.2% (128 connections). Thus when designing Bluetooth Low Energy networks, packet interference should be considered for the parameterization.