Patent ID: 11889459
Assignee: KONINKLIJKE KPN N.V.
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 17:
18. A wireless node comprising a transceiver, an oscillator coupled to a frequency synthesizer for generating carrier signals at different carrier frequencies, a phase detector configured to determine a phase difference between a phase of a response signal received by the node from a further node and a phase of a carrier signal selected from the different carrier signals, a computer readable storage medium having at least part of a program embodied therewith; and, a processor, preferably a microprocessor, coupled to the computer readable storage medium and the transceiver, wherein responsive to executing the computer readable program code, the processor is configured to perform executable operations comprising:
transmitting a first request message based on a first carrier signal to the further node and receiving a plurality of first response messages from the further node, the plurality of first response messages being transmitted based on a first reference carrier signal by the further node to the node;
transmitting a second request message based on a second carrier signal to the further node and receiving a plurality of second response messages from the further node, the plurality of second response messages being transmitted based on a second reference carrier signal by the further node to the node;
receiving a first phase difference and second phase difference from the further node, the first phase difference defining a difference between a phase of the first carrier signal and a phase of the first reference carrier signal at a predetermined time instance associated with the first request message and the second phase defining a difference between a phase of the second carrier signal and a phase of the second reference carrier signal at a predetermined time instance associated with the second request message;
determining a set of third phase differences and a set of fourth phase differences based on the plurality of first response messages and the plurality of second response messages respectively, each of the set of third phase differences defining a difference between a phase of the first reference carrier signal and a phase of the first carrier signal at a predetermined time instance associated with one of the plurality of first response messages; and, each of the set of fourth phase differences defining a difference between a phase of the second reference carrier signal and a phase of the second carrier signal at a predetermined time instance associated with one of the plurality of second response messages; and, optionally,
determining a distance and/or a frequency offset between the node and the further node based on the first and second phase difference and the set of third and fourth phase differences.