Title:
複数の非接触データ・キャリアと通信する方法および非接触データ・キャリア
Document Type and Number:
Japanese Patent JP4052674
Kind Code:
B2
Abstract:
A method of communicating with a plurality of contactless data carriers and a contactless data carrier for use in communicating with a base station. The method of communicating includes the base station transmitting a wake up signal for a plurality of contactless data carriers which are in a wait state. Then, the data carriers exit the wait state and transmit identity information to the base station in a time slot that is randomly self-assigned. The base station registers the identity information by polling the registered data carriers and initiates dialogue with registered data carriers in an order determined by the randomly self-assigned time slots of the registered data carriers. The method of communication helps to avoid the problem of data collision that often occurs when multiple contactless data carriers or smart cards operate in the field of a single base station or card reader.
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Inventors:
Garkel, anil
De shamp, paul
De shamp, paul
Application Number:
JP52314898A
Publication Date:
February 27, 2008
Filing Date:
November 03, 1997
Export Citation:
Assignee:
ATMEL RESEARCH
International Classes:
G06K17/00; G06K19/07; G06K7/00; H04B5/02
Domestic Patent References:
| JP8004746A | ||||
| JP8167090A | ||||
| JP8136648A | ||||
| JP5266267A | ||||
| JP4232488A | ||||
| JP8062327A | ||||
| JP5273338A | ||||
| JP63005286A | ||||
| JP6020107A |
Attorney, Agent or Firm:
Kuro Fukami
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Toshio Morita
Yoshihei Nakamura
Yutaka Horii