Method for managing collisions in a contactless data exchanging system
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United States of America Patent
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Nov 11, 2003
Grant Date -
N/A
app pub date -
Nov 22, 1999
filing date -
Mar 3, 1997
priority date (Note) -
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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.
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