BASE STATION, COMMUNICATION SYSTEM, AND SYNCHRONIZATION SIGNAL TRANSMISSION DEVICE

PROBLEM TO BE SOLVED: To provide a base station, a communication system, and a synchronization signal transmission device that can restrain mutual interference if plural types of TDD communication systems are used together in the same frequency band.SOLUTION: A base station capable of radio communication with a mobile station includes radio communication means for wirelessly communicating with the mobile station by using a first TDD (Time Division Duplex) system. The base station sets transmission and reception timing at a radio frame according to the first TDD system so that, between the radio frame according to the first TDD system and a radio frame according to a second TDD system used by another base station for wirelessly communicating with the mobile station by the second TDD system different from the first TDD system, transmission timing of a radio signal to the mobile station in the first TDD system does not overlap with reception timing of a radio signal from the mobile station in the second TDD system, and reception timing of a radio signal from the radio station in the first TDD system does not overlap with transmission timing to the mobile station in the second TDD system.SELECTED DRAWING: Figure 5 【課題】複数種類のＴＤＤ方式の通信システムを同一周波数帯で共存させて利用する場合に相互干渉を抑制することできる基地局、通信システム及び同期信号発信装置を提供する。【解決手段】移動局と無線通信可能な基地局は、第１のＴＤＤ（時間分割復信）方式を用いて移動局と無線通信を行う無線通信手段を備える。第１のＴＤＤ方式の無線フレームと、第１のＴＤＤ方式とは異なる第２のＴＤＤ方式で移動局と無線通信を行う他の基地局で用いる第２のＴＤＤ方式の無線フレームとの間で、第１のＴＤＤ方式における移動局に対する無線信号の送信タイミングと第２のＴＤＤ方式における移動局からの無線信号の受信タイミングとが重ならないように且つ第１のＴＤＤ方式における移動局からの無線信号の受信タイミングと第２のＴＤＤ方式における移動局に対する送信タイミングとが重ならないように、第１のＴＤＤ方式の無線フレームにおける送受信タイミングを設定する。【選択図】図５