Radio tag system and method with improved tag interference avoidance
US6034603A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 24, 1997 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | Jan 24, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10356
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data transmission system includes a reader transceiver and one or more tag transceivers. The reader transmits an activation signal to a tag. The tag selectively transmits a response signal to the reader at a specific time determined by a detected level of communications channel activity. The detector operates in a low-power standby state until the time it receives the activation signal, and then operates in an active state. The invention further incorporates a technique to maintain an extremely low power state to the tag during quiescent mode while retaining full sensitivity to reader activation signals. The reader transceivers are of a modular architecture with each module operating independently, yet in concert with the others. The modules are interconnected in a media independent method and can interact remotely with other modules.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.