A selection method is implemented in a mobile network (BN) comprising a group (G1) of first network clocks (N111-N114) each having a local clock (LC), belonging to a link-by-link synchronization domain in which they communicate in a link-by-link synchronization scheme and communicating in an end-to-end synchronization scheme with a master clock (MC) providing a frequency reference for synchronizing the local clocks (LC). This method comprises a step (i) consisting in collecting datasets of the local clocks (LC) of this group (G1), a step (ii) consisting in comparing these collected clock datasets to determine the best one according to criteria, then in selecting the first network clock (N113) offering this best clock dataset, and a step (iii) during which the selected first network clock is configured as a frequency synchronization gateway for interconnecting the master clock (MC) in an end-to-end synchronization domain by using a domain identifier of an end-to-end synchronization domain.
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