Method, apparatus, and system for time synchronization
AssigneeHuawei Technologies Co., Ltd.
InventorsGuijin Xu, Guozhu Long, Ruzhou Feng
Life of this patent
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Abstract
A method, apparatus, and system for time synchronization are disclosed. The method comprising: obtaining a master sending time stamp, a slave receiving time stamp, a slave sending time stamp, and a master receiving time stamp; and adjusting the time of the slave clock according to the offset calculated from the time stamps to synchronize with the clock time of the master clock. With the present invention, in passband transmission systems that transmit signals continuously in units of symbols, the time synchronization is implemented between the master clock and the slave clock.
Claims13
A method for time synchronization, the method comprising:
- obtaining a master sending time stamp, a slave receiving time stamp, a slave sending time stamp, and a master receiving time stamp, wherein the master sending time stamp is the time instant got from a master clock when a specific position of a first specific symbol is sent at the master clock side, the slave receiving time stamp is the time instant got from a slave clock when the specific position of the first specific symbol is received at the slave clock side, the slave sending time stamp is the time instant got from the slave clock when a specific position of a second specific symbol is sent at the slave clock side, and the master receiving time stamp is the time instant got from the master clock when the specific position of the second specific symbol is received at the master clock side;
- and
- adjusting the time of the slave clock according to the offset calculated from the time stamps to synchronize with the clock time of the master clock.
An apparatus for time synchronization, the apparatus comprising:
- a time stamp obtaining module, adapted to obtain a master sending time stamp, a slave receiving time stamp, a slave sending time stamp, and a master receiving time stamp, wherein the master sending time stamp is the time instant got from a master clock when a specific position of a first specific symbol is sent at the master clock side, the slave receiving time stamp is the time instant got from a slave clock when the specific position of the first specific symbol is received at the slave clock side, the slave sending time stamp is the time instant got from the slave clock when a specific position of a second specific symbol is sent at the slave clock side, and the master receiving time stamp is the time instant got from the master clock when the specific position of the second specific symbol is received at the master clock side;
- and
- a time adjusting module, adapted to adjust the clock time of the slave clock according to the offset calculated from the time stamps to synchronize with the clock time of the master clock.
A system for time synchronization, the system comprising:
- a master clock device, adapted to obtain and send a master sending time stamp and a master receiving time stamp;
- and
- a slave clock device, adapted to:
- obtain the master sending time stamp, a slave receiving time stamp, a slave sending time stamp, and the master receiving time stamp, and adjust clock time of a slave clock according to the offset calculated from the time stamps to synchronize with clock time of a master clock, wherein:
- the master sending time stamp is the time instant got from a master clock when a specific position of a first specific symbol is sent at the master clock side;
- the slave receiving time stamp is the time instant got from a slave clock when the specific position of the first specific symbol is received at the slave clock side;
- the slave sending time stamp is the time instant got from the slave clock when a specific position of a second specific symbol is sent at the master clock side;
- and the master receiving time stamp is the time instant got from the master clock when the specific position of the second specific symbol is received at the master clock side.
Dependencies are inferred from the claim text.