Koninklijke Kpn N.v.

Technische Universiteit Delft

Geert Jozef Therese Leus

Mario Alberto Coutino Minguez

Alle Jan Van Der Veen

Tarik Kazaz

Gerardus Johannes Maria Janssen

The invention relates to methods and systems for phase-based determination of a distance and/or a frequency offset between a first node and a second node in a wireless network. The method may comprise 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, the first node and/or the second 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.

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Rotterdam, Netherlands

Geert Jozef Therese Leus