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

Claim 0:
1. A method for determining a distance and/or a frequency offset between a first node and a second node in a wireless network, the method comprising:
the first node transmitting a first request message based on a first carrier signal to the second node and receiving a plurality of first response messages from the second node, the plurality of first response messages being transmitted based on a first reference carrier signal by the second node to the first node;
the first node transmitting a second request message based on a second carrier signal to the second node and the first node receiving a plurality of second response messages from the second node, the plurality of second response messages being transmitted based on a second reference carrier signal by the second node to the first node;
the first node receiving a first phase difference and second phase difference from the second 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;
the first node 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,
the first node and/or the second node or a further node determining a distance and/or a frequency offset between the first node and the second node based on the first and second phase difference and the set of third and fourth phase differences.