Communication system, communication method, and data processing apparatus

摘要

A communication system and communication method enable various types of near field communication. NFC communication apparatuses have two features in that each can perform communication in two communication modes and that each can perform data transmission at a plurality of transfer rates. The two communication modes consist of a passive mode and an active mode. In the passive mode, between the NFC communication apparatuses, for example, a first NFC communication apparatus transmits data to a second NFC communication apparatus by modulating electromagnetic waves generated by itself, while the second NFC communication apparatus transmits data to the first NFC communication apparatus by performing load modulation on the electromagnetic waves generated by the first NFC communication apparatus. Alternatively, in the active mode, either of the NFC communication apparatuses transmits data by modulating electromagnetic waves generated by itself. The present innovation can be applied to, for example, an IC card system, etc.

主权项

1. A communication system, comprising:
a first data processing apparatus and a second data processing apparatus configured to perform electromagnetic-induction communication using a carrier having a single frequency, each of the first and second data processing apparatuses comprising circuitry configured to:
modulate electromagnetic waves in accordance with data to be transmitted at one of a plurality of transfer rates; anddemodulate a signal of data transmitted at the one of the plurality of transfer rates, the one of the plurality of transfer rates corresponding to a transfer rate between the first and second data processing apparatuses, wherein the first data processing apparatus is configured to transmit a request command to the second data processing apparatus and to receive a response command from the second data processing apparatus in response to the request command, the first data processing apparatus is configured to transmit to the second data processing apparatus the request command including an indication relating to the transfer rate, and the second data processing apparatus is configured to change a specified transfer rate based on the indication, and to send the response command at the specified transfer rate in response to the request command.