Communication system and method for near field communication

A communication method for NFC using a mobile device that includes a host card emulation (HCE) application module and a security module that are connected to each other, the HCE application module including an NFC controller and a data processing module that are connected to each other, the method comprising steps of:

• activating the HCE application module;
• creating a connection between the HCE application module and the security module;
• waiting for an NFC signal from an external NFC reader;
• receiving the NFC signal by the NFC controller of the HCE application module;
• receiving the NFC signal from the NFC controller by a service unit of the data processing module, the service unit being connected to the NFC controller;
• processing the NFC signal by a data processing unit of the data processing module, the data processing unit being connected to the service unit;
• transmitting the NFC signal to the security module by a communication unit of the data processing module, the communication unit being connected to the security module and the data processing unit;
• storing at least one transaction-related key and transaction-related data of the NFC transaction signal in the security module and executing a process corresponding to the NFC signal by the security module;
• transmitting a responsive signal to the HCE application module by the security module via the communication unit, the data processing unit and the service unit of the data processing module of the HCE application module;
• and
• transmitting the responsive signal to the NFC reader by the NFC controller of the HCE application module.