Patent ID: 8224616
Filing Date: 2012-07-17
Classification: H04L

Abstract:
1. A server which receives observation data from a terminal which alternates between an activated state and a sleeping state, transmits the observation data by wireless communications in the activated state and stops transmitting observation data in the sleeping state, comprising: a latest data storage manager which manages a set of latest observation data of observation data received from the terminal; a history data storage manager which manages history data of the observation data received from the terminal from a set of previous observation data received from the terminal to the set of latest observation data; and a missing data manager which manages loss of the history data indicating missing observation data transmitted from the terminal and not received by the server, wherein the missing data manager sends a retransmission request to the terminal to retransmit the missing observation data that was not received by the server based on a predetermined rule, and receives the missing observation data retransmitted by the terminal receiving the retransmission request, and wherein, in case that a request for observation data is received from user terminal, at least one of the set of latest observation data managed by the latest data storage manager and the history data managed by the history data storage manager is output to the user terminal according to a type of the request for observation data received from the user terminal.