Asset tracking system having primary and secondary tracking devices
US9813850B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 2014 |
| Grant date | Nov 7, 2017 |
| Priority date | — |
| Expiry date | Sep 13, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W4/029
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An asset tracking system that utilizes a wireless network system and which includes primary (active) and secondary (passive) tracking devices. The primary tracking device acts as a coordinator and the secondary devices surrounding the coordinator act as end-devices. Each secondary device can communicate only with the primary device. The primary device passes messages (data) from the secondary devices to the remote host transparently. Each secondary device only sends its data when it triggered by a ‘ping’ from the primary device. When a ping event occurs, the primary device broadcasts a main data packet, in some embodiments followed by two additional data packets. Within this time span of the primary data packet, the secondary devices send their data packets to the primary device, in some embodiments, as two small data packets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.