US 11,889,390 B2
System for monitoring a state of occupancy of a pre-determined area
Roger Meier, Granges-Paccot (CH); and Patrick Terreaux, Bulle (CH)
Assigned to ROOMZ S.A., Fribourg FR (CH)
Appl. No. 17/294,939
Filed by ROOMZ S.A., Fribourg (CH)
PCT Filed Nov. 18, 2019, PCT No. PCT/EP2019/081632
§ 371(c)(1), (2) Date May 18, 2021,
PCT Pub. No. WO2020/104366, PCT Pub. Date May 28, 2020.
Claims priority of application No. 18206949 (EP), filed on Nov. 19, 2018.
Prior Publication US 2022/0022012 A1, Jan. 20, 2022
Int. Cl. H04W 4/33 (2018.01); H04W 4/38 (2018.01); H04W 4/029 (2018.01); H04W 4/021 (2018.01)
CPC H04W 4/33 (2018.02) [H04W 4/021 (2013.01); H04W 4/029 (2018.02); H04W 4/38 (2018.02)] 11 Claims
OG exemplary drawing
 
1. A system for monitoring a state of occupancy of a pre-determined area by at least one live presence, the system comprising:
a first sensor comprising a first time counter, the first sensor being configured to detect at least one movement of a live presence within a first pre-determined zone within the pre-determined area and being further configured to maintain a first log comprising, for each movement detected by the first sensor, a corresponding first event timestamp having a value which is based on a value of the first time counter when said movement within the first pre-determined zone is detected;
at least one second sensor comprising a second time counter, the second sensor being configured to detect at least one movement of a live presence within a second pre-determined zone within the pre-determined area and being further configured to maintain a second log comprising, for each movement detected by the second sensor, a corresponding second event timestamp having a value which is based on a value of the second time counter when said movement within the second pre-determined zone is detected; and
a server configured to receive the first and second logs via a wireless communications network, the first and second sensors further configured to attach or otherwise insert, respectively, a first and a second send timestamp to their corresponding logs, the first and second send timestamps having values derived from their respective time counters when the respective logs are sent, the server being further configured to analyze the first and second logs to provide the state of occupancy of the pre-determined area;
wherein:
the first sensor and the second sensor are battery-operated passive infra-red motion sensors; and
the server has access to a reference time counter and to topographic information concerning at least the first and second pre-determined zones, the first, second and reference time counters being configured to count at substantially a same frequency; and
wherein said analysis by the server includes combining the topographic information of the first and second pre-determined zones and the timestamps synchronised according to the reference time counter.