Patent ID: 11922746
Assignee: NXP B.V.
Field: Control (Instruments)
Classification: CPC G  B | IPC G

Claim 7:
8. A portable device for an access control system, the portable device comprising:
a biometric sensor configured to detect biometric signals;
a memory configured to store a digital identifier;
a body area network, BAN, transceiver;
a control unit coupled to the memory, the biometric sensor and the BAN transceiver; wherein the control unit is configured to:
receive a request signal from an access controller via the BAN transceiver in response to a body area network, BAN, of a user of the portable device being formed between the portable device and the access controller;
transmit a digital key via the BAN transceiver to the access controller, the digital key comprising a biometric signature of the user determined from the biometric sensor and the digital identifier; and the access controller being configured to authenticate a user access from the digital key and to control an actuator to lock or unlock a door;

a power management module coupled to the BAN transceiver, wherein the power management module is configured to trigger a transition from a first operating mode to a second operating mode in response to receiving the request signal and trigger a transition from the second operating mode to the first operating mode after a predetermined time period, wherein the portable device has a lower power consumption in the first operating mode than the second operating mode;
wherein the portable device further comprises an RF transceiver coupled to the control unit, and a power management module coupled to the RF transceiver, wherein the power management module is configured to trigger a transition from the first operating mode to the second operating mode in response to an RF signal transmitted from the access controller being detected and determining that the portable device is within a predetermined range of the access controller.