Abstract: Disclosed is a method for synchronizing transmission of signals from antenna reference points, ARP, (121, 122) of a wireless communication network (100). The method comprises initiating transmission of a first synchronization reference signal from a first ARP (121) at a first time point, instructing a second ARP (122) to determine a second time point for reception of the first synchronization reference signal, initiating transmission of a second synchronization reference signal from the second ARP (122) at a third time point, and instructing the first ARP to determine a fourth time point for reception of the second synchronization reference signal. The first and the second synchronization references signals are either transmitted in uplink communication resources available or they are transmitted in downlink communication resources.

Abstract: Methods and apparatuses for determining asynchronization between a first clock used by a first node (N1) and a second clock used by a second node (N2). A sequence of time differences is measured based on a sequence of signals periodically sent by the second node (N2) and received by the first node (N1), wherein each time difference of a signal is between a respective transmission timestamp in accordance with the second clock and a respective receiving timestamp in accordance with the first clock; and at least one of a relative phase offset or a relative frequency offset between the first and the second clock is estimated based on the sequence of time differences.

Abstract: A method and a first device (110A) for synchronizing a first clock in the first device (110A) with a second clock in a second device (110B). The first device (110A) estimates 5 (A430) a relative clock phase offset, based on a sequence of round trip times, RTTs, of precision time protocol, PTP, messages which are exchanged between the first and second devices (110A, 110B). The estimated relative clock phase offset is a time difference between a time of arrival of a first arrived PTP message among the PTP messages and a direct subsequent clock cycle. The first device (110A) further determines 10 (A450) a clock value of the first clock, based on the estimated relative clock phase offset, to synchronize the first clock with the second clock.

Abstract: A method and a first device (110A) for synchronizing a first clock in the first device (110A) with a second clock in a second device (110B). The first device (110A) estimates 5 (A430) a relative clock phase offset, based on a sequence of round trip times, RTTs, of precision time protocol, PTP, messages which are exchanged between the first and second devices (110A, 110B). The estimated relative clock phase offset is a time difference between a time of arrival of a first arrived PTP message among the PTP messages and a direct subsequent clock cycle. The first device (110A) further determines 10 (A450) a clock value of the first clock, based on the estimated relative clock phase offset, to synchronize the first clock with the second clock.