Base station device for wireless communication of OFDM signal including a synchronization control unit

摘要

While a clock generated by a built-in clock generator is used as a reference signal for determining a carrier frequency of a transmit signal, carrier frequency synchronization is achieved between base stations. A base station device is configured to perform wireless communication with a terminal device. In the base station device, accuracy of a carrier frequency of an OFDM signal is affected by accuracy of a clock frequency generated by a built-in clock generator 18. The base station device receives an OFDM signal transmitted from another base station device while transmission to the terminal device is stopped, estimates a carrier frequency offset of the OFDM signal, and corrects a carrier frequency of an OFDM signal to be transmitted to the terminal device.

主权项

1. A base station device configured to perform wireless communication of an OFDM signal with a terminal device and including a built-in clock generator that generates an operating clock, in which accuracy of a carrier frequency of the OFDM signal is affected by accuracy of a clock frequency generated by the built-in clock generator, the base station device comprising:
means for receiving a radio signal transmitted from another base station device while transmission to the terminal device is stopped; estimation means for determining, based on an OFDM signal received while transmission to the terminal device is stopped, an estimated value of a carrier frequency offset of the OFDM signal as synchronization mismatch between the base station device and another base station device; frequency correction means for correcting a carrier frequency of an OFDM signal to be transmitted to the terminal device, based on the estimated value; a storage unit for storing history information of synchronization mismatch between the base station device and another base station device; and a synchronization control unit for changing a cycle in which transmission to the terminal device is stopped, based on the history information of synchronization mismatch stored in the storage unit.