Precision time protocol link time error calibration using over-the-air synchronization
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsGábor Kovács, Andreas Olsson, Mikael Johansson, Stefano Ruffini
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Abstract
According to certain embodiments, a method (700) by a network node (660) includes determining (705) a timing error associated with a closed loop comprising at least one radio link between two radio points. The timing error is determined based on at least one timing measurement associated with the at least one radio link. The method further includes adjusting (710) timing information carried over the a timing protocol link based on the timing error associated with the closed loop comprising the at least one radio link.
Claims24
A method by a network node comprising:
- determining a timing error associated with a closed loop comprising at least one radio link between two radio points, the timing error determined based on at least one timing measurement associated with the at least one radio link;
- and
- adjusting timing information carried over a timing protocol link based on the timing error associated with the closed loop comprising the at least one radio link;
- wherein determining the timing error associated with the closed loop comprises:
- obtaining a PTP network topology associated with a first set of radio points, T, that includes the at least two radio points;
- obtaining an Over-the-Air Synchronization (OAS) network topology associated with a second set of radio points, R, that includes the at least two radio points;
- and
- selecting a set of network elements, N, that is an intersection of the first set of radio points, T, and the second set of radio points, R, and
- wherein the PTP network topology and the OAS network topology form a connected graph.
A network node adapted to:
- determine a timing error associated with a closed loop comprising at least one radio link between two radio points, the timing error determined based on at least one timing measurement associated with the at least one radio link;
- and
- adjust timing information carried over a timing protocol link based on the timing error associated with the closed loop comprising the at least one radio link;
- wherein, when determining the timing error associated with the closed loop, the network node is adapted to:
- obtain a PTP network topology associated with a first set of radio points, T, that includes the at least two radio points;
- obtain an Over-the-Air Synchronization (OAS) network topology associated with a second set of radio points, R, that includes the at least two radio points;
- select a set of network elements, N, that is an intersection of the first set of radio points, T, and the second set of radio points, R, and
- wherein the PTP network topology and the OAS network topology form a connected graph.
Dependencies are inferred from the claim text.