Part-I - Controller General of Patents Designs and Trademarks

(12) PATENT APPLICATION PUBLICATION (21) Application No.1949/CHE/2011 A
(19) INDIA
(22) Date of filing of Application :08/06/2011 (43) Publication Date : 21/06/2013
(54) Title of the invention : PEOPLE LOCATING SYSTEM USING ZIGBEE
(51) International classification :H04L
(31) Priority Document No :NA
(32) Priority Date :NA
(33) Name of priority country :NA
(86) International Application No
:NA
Filing Date
:NA
(87) International Publication No : NA
(61) Patent of Addition to Application Number :NA
Filing Date
:NA
(62) Divisional to Application Number
:NA
Filing Date
:NA
(71)Name of Applicant :
1)AMERICAN MEGATRENDS INDIA PRIVATE
LIMITED
Address of Applicant :KUMARAN NAGAR, OFF OLD
MAHABALIPURAM ROAD, SEMMANCHERY, CHENNAI -
600 119 Tamil Nadu India
(72)Name of Inventor :
1)SRIDHARAN MANI
2)SANTHOSH SAMUEL MATHEWS
(57) Abstract :
A people locating system using a Zigbee network comprising 3 types of devices, a) an arm band for victim namely target device,
end device or victim's device b) mobile device for the search person namely router or search person's device c) mobile device for
staff-in-charge, namely coordinator. The coordinator initiates the Zigbee network and allows routers and end devices to join. All
routers are registered with the coordinator as a non-victim device. Each router will update of the node identifier of newly
connected devices to the coordinator and identify any new devices as the target device. Coordinator requests RSSI from the
respective target device which then sends broadcast message to all routers. Each router then sends RSSI of the node along with
node ids and GPS location to the coordinator. The coordinator receives response of the target device and all connected routers so
that location of all routers and RSSI from the connected routers is known to it. The coordinator then dynamically changes the
function of the end device to a router so that it can connect to other victims and extend the range of discovery of victims. The
RSSI is dynamically calibrated based on the distance calculated using GPS and RSSI between routers and transmission power of
each router. The transmission power of the mobile devices carried by the search person is dynamically adjusted to stay connected
with out-of-coverage devices or increase battery life. If three or more than three devices are connected to the target device,
trilateral technique will be applied to get more accurate location information. The LCD panel of the coordinator and search
persons displays the relative position of the coordinator, routers and victims.
No. of Pages : 28 No. of Claims : 10
The Patent Office Journal 21/06/2013 13963