Method and system for inventorying wireless transponders providing anti-eavesdropping anti-collision
US8258927B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2008 |
| Grant date | Sep 4, 2012 |
| Priority date | — |
| Expiry date | May 19, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/13095
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides one or more powered wireless transponders and/or one or more passive wireless transponder devices communicating with a reader/interrogator and the method of efficiently inventorying these devices without the risk of eavesdropping. A reader transmits a random number and transponders generate their own random number. The transponders whose random number matches all or a part of the random number responds. If a collision occurs, the reader's random number can be changed and retransmitted until almost one transponder response is verified in a tree search algorithm. Specifically, the invention concerns a method for inventorying wireless transponders providing anti-eavesdropping anti-collision.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.