| 摘要 |
<p>The invention relates to a method for managing collisions in a data exchange system between portable objects and at least one send-receive terminal capable of cooperating with a plurality of said portable objects which are simultaneously present in the communications field of the terminal. The method consists of the following steps: a) transmission of call messages by the terminal to the portable objects; b) conditional transmission from the portable object to the terminal of a response message to the call message with a probability of possibly less than 100 %, where the response message contains an identification code specific to the portable object; c) when the terminal receives an answer from an identified portable object and if said response does not collide with the answer sent by another portable object, a specific data communication link is established between the terminal and identified portable object, data are exchanged and the process returns to step a) for a further iteration; and d) if there is no reception without collision, return to step a) for a further iteration. According to the invention, the portable object over time modulates said probability of response depending on whether or not it has already replied to a call message sent by the terminal.</p> |
