| 主权项 |
1. A method comprising:
receiving, at a first device, a first piece of sensor data and a second piece of sensor data from a sensor; storing, in a storage unit included in the first device, the first piece of sensor data and the second piece of sensor data in response to communication being disconnected between the first device and a second device configured to analyze sensor data; determining that communication has been connected between the first device and the second device; receiving, at the first device and from the second device, a first query; and transmitting to the second device, in response to the determination that communication has been connected, the stored first piece of sensor data, but excluding the stored second piece of sensor data, as sensor data selected by the first query, wherein the first query comprises a continuous query specifying repeated queries, each repeated query requiring pieces of sensor data, wherein the first query further comprises an allowable delay limit indicating a maximum allowable amount of time that may elapse from a time that sensor data is generated to a predetermined time, and selecting sensor data selected by the first query comprises:
generating query windows where each query window is a basic unit of a set of sensor data that is used to process each repeated query in the continuous query;calculating a time elapsed from a generation time of a last sensor data of each query window to the predetermined time; andextracting sensor data contained in at least one query window of which the calculated elapsed time is less than the allowable delay limit. |
