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

Claim 18:
19. A wireless node comprising a transceiver, an oscillator coupled to a frequency synthesizer for generating carrier signals of different carrier frequencies, a phase detector configured to determine a phase difference between a phase of a response signal received by the node from an further node and a phase of a carrier signal selected from the N 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 request messages based on carrier signals at carrier frequencies to the further node and receiving for each of the request signals, a time series of response messages from the further node, wherein for each of the request messages the time series of response messages being transmitted based on one of reference carrier signals, each one of the reference carrier signals being transmitted at one of reference carrier frequencies by the further node to the node, wherein the carrier frequencies and the reference carrier frequencies form frequency channels between the node and the further node;
receiving first phase differences from the further node, each of the first phase differences defining a difference between a phase of one the carrier signals and a phase of one of the reference carrier signals at a predetermined time instance associated with one of first request messages, the frequency of the one of the carrier signals and the frequency of the one of the references carrier signals being in the same frequency channel;
determining second phase differences based on the request signals and the response messages, the determining of the second phase differences including computing for each one of the carrier signals phase differences, each of the phase differences defining a difference between a phase of one of the reference carrier signals and a phase of one of the carrier signals at a predetermined time instance associated with one of the time series of response messages; and, optionally,
determining a distance and/or a frequency offset between the node and the further node based on the first phase differences and the second phase differences.