Method of preventing collisions between RFID readers in RFID system
US8222997B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 7, 2007 |
| Grant date | Jul 17, 2012 |
| Priority date | — |
| Expiry date | Nov 11, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/18
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Disclosed herein is a method of preventing collisions between readers in an RFID system. The method includes a first step of RFID readers selecting transmitting channels by examining channels, a second step of transmitting signals via the selected transmitting channels, a third step of receiving signals via channels having the same frequencies as the selected transmitting channels; a fourth step of determining whether a collision has occurred by examining the status of the signals that are received via the transmitting channels; a fifth step of, if, as a result of the determination at the fourth step, it is determined that a collision between the readers has occurred, repeating the first to fourth steps after delays of random time periods based on a predetermined equation, and a sixth step of, if, as a result of the fourth step, no collision between readers is detected, communicating with the corresponding RFID tags.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.