Communication apparatus and communication method

Details Communication apparatus and communication method Communication apparatus and communication method

2007-04-24

2007-04-24

Phu, Sanh D. (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

Short range rf communication

C455S088000, C342S042000, C342S044000

Reexamination Certificate

active

10715447

ABSTRACT:
A communication apparatus and a communication method prevent responses from being simultaneously received from two or more communicating parties. A first NFC apparatus transmits data for requesting IDs, and acquires IDs sent from second and third NFC apparatuses in reply to the request. After acquiring the IDs of the second and third NFC apparatuses, the first NFC apparatus transmits data that includes their IDs as the data for the second and third NFC apparatuses. If the first NFC apparatus cannot properly acquire the IDs of the second and third NFC apparatuses, then it sends the data for requesting their IDs again. Upon receipt of the request for the IDs, the second and third NFC apparatuses generate their own IDs by using random numbers and send the generated IDs. If the second and third NFC apparatuses receive the request for their IDs again, then they re-generate their own IDs by using random numbers, and send the re-generated IDs again. The present invention can be applied to, for example, an IC card system.

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