Apparatus and method for providing near field communication for mobile device

An apparatus for providing near field communication (NFC) for a mobile device, the apparatus comprising:

• a USB (universal serial bus) signal processing unit configured to convert a signal of the mobile device that is received through a USB interface into a value which is to be processed in a central processing unit, and convert the value received from the central processing unit into a signal which is to be transmitted to the USB interface;
• an interface of a contact-type IC card, which is configured to serve as an interface of one of a contact reset signal, a contact I/O (input/output) signal and a contact clock;
• a contact serial signal processing unit configured to convert the digital signal received from the interface of the contact-type IC card into a value which is to be processed in the central processing unit, and convert the value processed the central processing unit into a digital signal;
• and
• an analog signal processing unit configured to convert an analog signal wirelessly received from an outside device through an antenna, and convert the digital signal of the central processing unit into an analog signal to transmit the converted analog signal to the antenna.

A method for providing near field communication (NFC) for a mobile device, the method comprising:

• outputting a logical value for notifying that a non-contact signal is detected when a RF (radio frequency) signal from outside is detected through an antenna while power is not provided from a mobile device;
• after the power is provided by the mobile device which checks that the non-contact signal is detected by the logical value, receiving a command notifying that the power is provided by the mobile device through a data line of a USB interface;
• and
• after a command notifying that the power is provided, transmitting ATR (answer to reset) serving as a response command thereto to the mobile device.

A method for providing near field communication (NFC) for a mobile device, the method comprising:

• generating an RF (radio frequency) field in outside through an antenna using the power provided by the mobile device connected through a USB (universal serial bus) interface;
• transmitting a request for feature of a RF communication to an outside device;
• if there is a response to the request for the feature of the RF communication from the outside device, determining whether feature parameters are variable;
• if it is determined that the feature parameters are variable, transmitting a command of request for varying the feature parameters to the outside device;
• and
• after a response command notifying a request for varying the feature parameters of the RF communication is received from the outside device, varying the feature parameters of the RF communication and performing the RF communication using the varied feature parameters.