Phase-shift guard-space timestamp point for 5G/6G synchronization

A method for a user device of a wireless network to receive synchronization signals, the method comprising:

• a) receiving a signal occupying a single symbol-time of a resource grid, the signal comprising a first guard-space portion followed by a second guard-space portion followed by a message portion;
• b) wherein the message portion comprises a final region at an ending of the symbol-time, and a pre-final region immediately preceding the final region;
• c) comparing the signal in the second guard-space portion to the signal in the final region of the message portion;
• d) comparing the signal in the first guard-space portion to the signal in the pre-final region, phase-shifted according to a predetermined phase shift;
• e) determining, according to the comparing, a timestamp time corresponding to a boundary between the first guard-space portion and the second guard-space portion;
• and
• f) adjusting a clock setting of the user device, according to the timestamp time, to bring the clock of the user device into agreement with a clock of a base station of the wireless network.

A method for a user device, of a wireless network comprising a base station, to adjust a clock frequency, the method comprising:

• a) periodically receiving a guard-space timestamp point comprising a 180 degree phase reversal of a signal in a guard-space of a predetermined resource element;
• b) upon receiving each timestamp point, determining a timing correction according to a time difference comprising a time of the timestamp point minus a time of a midpoint of the guard-space, and applying a time correction to a clock of the user device according to the time difference;
• c) after receiving at least integer N timestamp points, determining an average of N time differences;
• d) calculating a frequency offset comprising the average of N time differences, times a frequency of the clock of the user device, divided by an interval between the timestamp points;
• and
• e) adjusting the frequency of the clock of the user device according to the frequency offset.