LoRaWANuppkopplade smartcyklar : En studie som undersöker hur väl LoRaWAN fungerar för smartcyklar.

Detta är en Kandidat-uppsats från Jönköping University/JTH, Datateknik och informatik; Jönköping University/JTH, Datateknik och informatik

Författare: Erik Befwe; Jonny Fherm; [2019]

Nyckelord: ;

Sammanfattning: The purpose of this thesis is to examine if LoRaWAN is a possible alternative to older, more established, wireless networks in the smart bike context, and how much power a LoRaWAN node consumes in the same context. A hardware application was developed where a connection to the LoRa network can be achieved. Theoretical calculations for power consumption and for waiting time to send data were made to answer if it is possible to send data with LoRaWAN every 50 meters when a cyclist has an average speed of 25 km/h. In addition, the coverage of the network in the central parts of Jönköping municipality was also examined. To examine the coverage in Jönköping, an experiment was constructed where signal strength and packet loss could be tested in several places in the city. The result of the experiment were different RSSI and SNR values which could then be analyzed to produce a coverage map for the positions tested. In order to answer whether it is possible to send data often enough for a smart bike which, according to the demarcations, must be updated every 50 meters, calculations were made according to the chapter on restrictions and power calculation. 25 km/h is used for cyclists’ average speed and the time interval to be achieved is calculated to 7.2 seconds. This interval can be achieved if several sub-bands are used, which indicates that it is possible to use LoRaWAN for a smart cycle application. Calculations for power consumption were made using the collected theory about power calculation. Graphs were compiled for how the power depends on the amount of data when the time interval is constant (7.2 seconds) and how the power depends on the time interval when the data amount is constant (12 bytes). The coverage was perceived as good even though the network is not yet so widespread and given the low DR (data rate) used. The results of the study will be useful for deciding as to whether it is a good idea to use LoRaWAN as an alternative to more well-established networks for applications that needs to send data relatively often and be wireless and energy efficient. Another possible use of the results could be to strategically place more gateways for Jönköping Energy's LoRa network. Due to time shortage, the sample size for signal strength and packet loss is small. To get a more reliable result more extensive experimentation would have been needed. According to research, weather plays a role in radio communication and unfortunately the weather could not be considered for the same reasons. Calculations have also not been made for how the average power is affected when a GPS module is used, which is a requirement for sending the smart bikes coordinates.

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