Air-Interface-Based Synchronization Method, Base Station, Control Apparatus, and Wireless Communications System

A central controller, comprising:

• an interface configured to perform information exchange with a base station;
• a processor connected to the interface;
• and
• a non-transitory computer readable medium connected to the processor and having stored thereon instruction that, when executed by the processor, cause the central controller to:
• acquire at least one time difference;
• acquire a time adjustment value of a second base station based on the at least one time difference and a reference time of a first base station, wherein the at least one time difference is a time difference between the first base station and the second base station, wherein the at least one time difference comprises a first time difference, wherein the first time difference is a time difference acquired based on non-contention based random access of a first user equipment (UE) handed over between the first base station and the second base station, and wherein the first base station is a reference base station and the second base station is a non-reference base station;
• and
• send the time adjustment value through the interface to the second base station.

A base station, which serves as a first base station, comprising:

• an interface;
• a processor connected to the interface;
• and
• a non-transitory computer readable medium connected to the processor and having stored thereon instruction that, when executed by the processor, cause the base station to:
• acquire a first time difference, wherein the first time difference is a time difference acquired based on non-contention based random access of a first user equipment (UE) handed over between the first base station and a second base station;
• and
• send the first time difference through the interface to a central controller, so that the central controller acquires a time adjustment value of the second base station based on acquired at least one time difference and a reference time of the first base station, wherein the at least one time difference comprises the first time difference, wherein the first base station is a reference base station, and the second base station is a non-reference base station.