A system is provided for maintaining Quality of Service parameters of data transmissions. The base unit and the portable unit communicate with each other via wireless frequency hopping radio communications links. The system further comprises a service that communicates with the wireless device via a wireless network. the patient’s stomach, an inflation subcomponent causes the implant to expand from a compact delivery state to an expanded, volume-occupying, deployed state. The gravity sensor circuit system performs self-diagnosis, zero-offset, and digital output, thereby using a more accurate sensor signal, improving the vehicle stability, and increasing the control precision and accuracy.