A Low-Power Self-service Bus Arrival Reminding Algorithm on Smart Phone

In this paper, a low-power self-service bus arrival reminding algorithm on smart phone is proposed and implemented. The algorithm first determines the current position of the bus by Global Positioning System (GPS) module in smart phone and calculates the linear distance from the bus current position to the destination station, then sets a buffer distance for reminding passengers of getting off the bus, estimates the bus maximum speed and calculates the minimum time of approaching the buffer. In terms of the time, the frequency of the GPS location and the distance calculation between the bus and the destination station is intelligently adjusted. Once the distance to destination station is within the buffer distance, smart phone will immediately remind passengers to get off. The test result shows that the algorithm can timely provide personalized arrival reminding service, efficiently meet the requirements of different passengers and greatly reduce the power consumption of smart phone.