Method for managing collisions in a contactless data exchanging system
US6646543B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1999 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Nov 22, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/0008
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method handles collisions in a data interchange between portable objects and at least one data transceiver. The method includes the steps of the transceiver transmitting to said plurality of portable objects general call messages, each including a collision probability modulation parameter. Each portable object conditionally transmits to the transceiver a general call response with a probability of less than 100% as a function of the collision probability modulation parameter and having a specific identifier. The transceiver receives a general call response message, and in the absence of any collision between said message and a message transmitted by another portable object, a specific data communication link is established. Otherwise the method returns to the first step and repeats, optionally modifying the dynamic range of the probability modulation parameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.