A method for locating a tag by a network of sensors using the IEEE 802.15.4a protocol. The reference anchor of the network sends a UWB signal comprising first beacons at regular intervals, and a narrow band signal on an auxiliary channel, comprising second beacons, the second beacons being in synchronous relation with the first beacons. The tag negotiates with a coordinator anchor, via the auxiliary channel, the allocation of an elementary interval within the UWB superframe. When an elementary interval is allocated to the tag, it places its narrow band receiver in standby mode and sends a clap message in the elementary interval.
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
H04W 4/80 - Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
G01S 13/02 - Systems using reflection of radio waves, e.g. primary radar systemsAnalogous systems
A method for reconfiguring a network of wireless sensors in which certain nodes, referred to as coordinating anchors, emit beacon signals, and others, referred to as subordinated anchors, receive the signals only for synchronisation purposes. The whole network synchronises from peer to peer via wireless links from a primary anchor, the various nodes being further configured, via an auxiliary channel, from a central server. When a node loses its synchronisation, one or more subordinated anchors can be transformed into coordinating anchors by the central server so as to restore the synchronisation of the node. Likewise, when an electronic tag moves through the network, subordinated anchors can be transformed dynamically into coordinating anchors in order to ensure the synchronisation of the tag.
The present invention relates to a handover method for a tag in a wireless sensor network having a cellular architecture. At the tag or the coordinating anchor, the distances separating the tag from the different coordinating anchors in the cell are used to determine if the tag is in a coverage area of the cell. If the tag is not in a coverage area of the cell, the tag searches for the beacon signal from neighbouring cells that has the strongest power over a plurality of superframes. If this power value satisfies a selection criterion, the tag establishes a link with the coordinating anchor of this new cell and breaks the link with the coordinating anchor of the previous cell.
H04W 36/36 - Reselection control by user or terminal equipment
H04W 36/32 - Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
G01S 1/80 - Systems for determining direction or position line using a comparison of transit time of synchronised signals transmitted from non-directional transducers or transducer systems spaced apart, i.e. path-difference systems
The present invention concerns a method for locating a tag by a network of sensors using the IEEE 802.15.4a protocol. The reference anchor of the network sends a UWB signal comprising first beacons at regular intervals, and a narrow band signal on an auxiliary channel, comprising second beacons, the second beacons being in synchronous relation with the first beacons. The tag negotiates with a coordinator anchor, via the auxiliary channel, the allocation of an elementary interval within the UWB superframe. When an elementary interval is allocated to the tag, it places its narrow band receiver in standby mode and sends a clap message in said elementary interval.
The invention relates to a method for reconfiguring a network of wireless sensors in which certain nodes, referred to as coordinating anchors, emit beacon signals, and others, referred to as subordinated anchors, receive said signals only for synchronisation purposes. The whole network synchronises from peer to peer by means of wireless links from a primary anchor, the various nodes being further configured, via an auxiliary channel, from a central server. When a node loses its synchronisation, one or more subordinated anchors can be transformed into coordinating anchors by the central server so as to restore the synchronisation of the node. Likewise, when an electronic tag moves through the network, subordinated anchors can be transformed dynamically into coordinating anchors in order to ensure the synchronisation of the tag.
09 - Scientific and electric apparatus and instruments
38 - Telecommunications services
42 - Scientific, technological and industrial services, research and design
Goods & Services
Measuring, signalling, checking (supervision) and life-saving apparatus and instruments; Computer software; Computer software for systems for positioning, geopositioning and tracking of objects and persons, for use indoors and outdoors; Electronic apparatus and instruments for navigation, location, guidance, tracking, targeting and cartographic purposes, for use indoors and outdoors; Global location instruments for use indoors and outdoors; Global positioning apparatus for use indoors and outdoors; Global positioning instruments; GPS location system receivers; Transmitters for global location systems, for use indoors and outdoors; Electronic global positioning and location apparatus and systems, for use indoors and outdoors; Electronic sensors; GPS detectors; Protection devices for personal use against accidents; Geopositioning apparatus for diagnostics (not for medical purposes) for goods and individuals; Computers and data processing equipment, in particular relating to the geopositioning, indoors and outdoors, of connected objects and individuals; Computer hardware for the dissemination and compilation of positioning data. Telecommunications, communications by computer terminals or by fibre optic networks; Providing access to databases; Electronic advertising services (telecommunications); Providing telecommunications connections to a global computer network; Rental of telecommunication equipment; The aforesaid services being provided in connection with data relating to the positioning, geopositioning and tracking of objects and/or individuals, indoors and outdoors. Engineering evaluations and appraisals in the fields of science and technology; Scientific and technical research; Design and development of computer hardware and software; Technical project studies, research and development of new products for others, in particular relating to navigation, location, guidance and tracking of objects and individuals, indoors and outdoors; Design, installation, maintenance, updating and rental of computer software; Computer programming; Computer system analysis; Computer system design; Consultancy in the field of computers; Software as a service (SaaS); Information technology [IT] consultancy; Energy auditing.
09 - Scientific and electric apparatus and instruments
38 - Telecommunications services
42 - Scientific, technological and industrial services, research and design
Goods & Services
Measuring, signalling, checking (supervision) and life-saving apparatus and instruments; Computer software; Computer software for systems for positioning, geopositioning and tracking of objects and persons, for use indoors and outdoors; Electronic apparatus and instruments for navigation, location, guidance, tracking, targeting and cartographic purposes, for use indoors and outdoors; Global location instruments for use indoors and outdoors; Global positioning apparatus for use indoors and outdoors; Global positioning instruments; GPS location system receivers; Transmitters for global location systems, for use indoors and outdoors; Electronic global positioning and location apparatus and systems, for use indoors and outdoors; Electronic sensors; GPS detectors; Protection devices for personal use against accidents; Geopositioning apparatus for diagnostics (not for medical purposes) for goods and individuals; Computers and data processing equipment, in particular relating to the geopositioning, indoors and outdoors, of connected objects and individuals; Computer hardware for the dissemination and compilation of positioning data. Telecommunications, communications by computer terminals or by fibre optic networks; Providing access to databases; Electronic advertising services (telecommunications); Providing telecommunications connections to a global computer network; Rental of telecommunication equipment; The aforesaid services being provided in connection with data relating to the positioning, geopositioning and tracking of objects and/or individuals, indoors and outdoors. Engineering evaluations and appraisals in the fields of science and technology; Scientific and technical research; Design and development of computer hardware and software; Technical project studies, research and development of new products for others, in particular relating to navigation, location, guidance and tracking of objects and individuals, indoors and outdoors; Design, installation, maintenance, updating and rental of computer software; Computer programming; Computer system analysis; Computer system design; Consultancy in the field of computers; Software as a service (SaaS); Information technology [IT] consultancy; Energy auditing.
