Wireless communication system, wireless terminal, and time synchronization method

A wireless terminal in a wireless communication system including a wireless base station and the wireless terminal, the wireless terminal comprising:

• a wireless receiver configured to separately receive timing information having a fixed frame length and transmitted from the wireless base station and time information indicating a transmission time indicated by a first clock included in the wireless base station at a time when the wireless base station completes transmitting the timing information;
• a second clock;
• and
• a correction processor configured to:
• store a reference time indicated by the second clock at a time when the wireless receiver detected synchronization of a radio frame relating to the timing information;
• calculate, from the fixed frame length of the timing information and a transmission rate used for wireless communication between the wireless base station and the wireless terminal, a time required to receive the timing information and
• correct the second clock using a difference between a elapsed time indicating a time when the time required to receive the timing information has elapsed from the reference time and the transmission time indicated by the time information as a correction quantity.

A time synchronization method executed by a wireless communication system including a first wireless device and a second wireless device, the time synchronization method comprising:

• a transmission step in which the first wireless device wirelessly transmits timing information and time information separately, the time information being acquired from a first clock included in the first wireless device and indicating a transmission time when a transmission of the timing information is completed, and the timing information having a fixed frame length;
• a reception step in which the second wireless device receives the wirelessly transmitted timing information and time information separately;
• a storing step in which the second wireless device stores a reference time indicated by the second clock at a time when the wireless receiver detected synchronization of a radio frame relating to the timing information;
• a calculation step in which the second wireless device calculates, from the fixed frame length of the timing information and a transmission rate used for wireless communication between the first wireless device and the second wireless device, a time required to receive the timing information;
• and
• a correction step in which the second wireless device corrects the second clock using a difference between a elapsed time indicating a time when the time required to receive the timing information has elapsed from the reference time and the transmission time indicated by the time information as a correction quantity.