Nfc method and device for communication with improved power harvesting

Method for near field communication (NFC) with improved power harvesting, the method enabling Power Save Mode (PSM) in NFC between a first active NFC device and a second NFC device, when the first active NFC device and the second NFC device are in NFC connected mode, characterized by:

• the first active NFC device and the second NFC device entering PSM comprising:
• a first initialization step and thereafter the first active NFC device and the second NFC device concurrently alternating between the following steps:
• during a first time slot, called active data mode, data is exchanged between the first active NFC device and the second NFC device, the field strength optionally being controlled;
• and
• during a second time slot, called standby mode, the first active NFC device transmitting a standby sequence of NFC waves having lower average power than in the data sequence in said first slot, the NFC waves comprising at least one of:
• lower average field strength than in said first slot comprising substantially zero field strength;
• and
• non-continuous duration,
• while the first active NFC device and the second NFC device remain in NFC connected mode and the second NFC device harvesting sufficient power to remain in NFC connected mode.