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This article evaluates the quality-of-service performance and scalability ofthe recently released Bluetooth Mesh protocol and provides general guidelineson its use and configuration. Through extensive simulations, we analyzed theimpact of the configuration of all the different protocol's parameters on theend-to-end reliability, delay, and scalability. In particular, we focused onthe structure of the packet broadcast process, which takes place in timeintervals known as \textit{Advertising Events} and \textit{Scanning Events}.Results indicate a high degree of interdependence among all the differenttiming parameters involved in both the scanning and the advertising processesand show that the correct operation of the protocol greatly depends on thecompatibility between their configurations. We also demonstrated thatintroducing randomization in these timing parameters, as well as varying theduration of the \textit{Advertising Events}, reduces the drawbacks of theflooding propagation mechanism implemented by the protocol. Using datacollected from a real office environment, we also studied the behavior of theprotocol in the presence of WLAN interference. It was shown that Bluetooth Meshis vulnerable to external interference, even when implementing the standardizedlimitation of using only 3 out of the 40 Bluetooth Low Energy frequencychannels. We observed that the achievable average delay is relatively low, ofaround 250~ms for over 10 hops under the worst simulated network conditions.However, results proved that scalability is especially challenging forBluetooth Mesh since it is prone to broadcast storm, hindering thecommunication reliability for denser deployments.

Understanding the Performance of Bluetooth Mesh: Reliability, Delay and Scalability Analysis