Patent ID: 9600443
Date: 2017-03-21
CPC Classifications: G06F,G06K,G07C,G10L

Claim:
1. A computer-implemented method, performed in a first sensor device, for tracking a movable entity, wherein the movable entity is a physical entity within a physical space, the method comprising: a) synchronizing, with one or more other sensor devices, a first data value corresponding to a first time slot associated with a current time, the first time slot being one of a series of time slots shared by all the sensor devices; b) generating a set of data based on sensing of one or more attributes of the movable entity, wherein the set of data is uniquely identifiable data that uniquely identifies the movable entity; c) calculating identifying data from the generated set of data for identifying the movable entity based on the identifying data, wherein the identifying data is a reduced size set of data relative to the generated set of data and is directed to identifying characteristics of the movable entity within the generated set of data; d) calculating derivative identifying data by applying a modifying function on the identifying data, the modifying function using the identifying data as first input value and using the first data value as a second input value for modifying the identifying data based on the first data value, wherein the derivative identifying data is anonymized data which does not uniquely identify the movable entity; e) calculating a first hash value at least by applying a hash function to the derivative identifying data; and f) sending a message from the first sensor device to a central server for determining the position of the movable entity, the message comprising the hash value and an identifier of the first sensor device.