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    • 2. 发明公开
    • PROCEDE PERFECTIONNE DE GESTION DES COLLISIONS DANS UN SYSTEME D'ECHANGE DE DONNEES SANS CONTACT
    • 改进方法管理冲突在通信系统,而无需联系
    • EP0976084A1
    • 2000-02-02
    • EP99900940.0
    • 1999-01-15
    • Innovatron Electronique (Societe Anonyme)
    • GRIEU, François
    • G06K7/00G06K7/10
    • G06K7/10346G06K7/0008G06K7/10039
    • 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 a response from an identified portable object and if said response does not collide with the response 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, terminal transmissions comprise two types of call messages: query messages, which initialise the probability of response by the portable objects, and marker messages sent out in succession after query messages. The marker messages are able to instruct the portable objects to adjust the probability value on reception of a marker message in the absence of a previous response to a call message.
    • 3. 发明授权
    • PROCEDE PERFECTIONNE DE GESTION DES COLLISIONS DANS UN SYSTEME D'ECHANGE DE DONNEES SANS CONTACT
    • 改进方法管理冲突在通信系统,而无需联系
    • EP0976084B1
    • 2005-10-05
    • EP99900940.0
    • 1999-01-15
    • Innovatron Electronique (Societe Anonyme)
    • GRIEU, François
    • G06K7/00G06K7/10
    • G06K7/10346G06K7/0008G06K7/10039
    • 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 a response from an identified portable object and if said response does not collide with the response 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, terminal transmissions comprise two types of call messages: query messages, which initialise the probability of response by the portable objects, and marker messages sent out in succession after query messages. The marker messages are able to instruct the portable objects to adjust the probability value on reception of a marker message in the absence of a previous response to a call message.