NFC method and device enabling power save mode during NFC connected mode 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 introducing two sub modes in form of time division between two time slots, the 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, data is exchanged between the first active NFC device and the second NFC device, NFC field strength being controlled;
• and
• during a second time slot, the first active NFC device transmitting a standby sequence of NFC waves having lower average power than in the first time slot, the NFC waves comprising at least one of:
• lower average field strength than in the first time slot comprising substantially zero field strength;
• and
• non-continuous duration,
• while the first active NFC device and the second NFC device remain in the NFC connected mode and the second NFC device harvesting sufficient power from the NFC waves to remain in the NFC connected mode.