BASE STATION, COMMUNICATION SYSTEM, AND SYNCHRONIZATION SIGNAL TRANSMISSION DEVICE

• Main Authors: MURAMATSU YUKI, HIRASAWA HIROKI, SHIMAZAKI YOSHIHITO, UMEHARA TAKESHI, HIBI NORIAKI, NAKAI HIROTO, UEYAMA HOSHITO, ASANUMA KUNIMITSU, KON YOSHIKI
• Format: Patent
• Language: English; Japanese
• Published: 01.02.2018
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; MULTIPLEX COMMUNICATION; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION; WIRELESS COMMUNICATIONS NETWORKS

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 synchronizes a radio frame according to the first TDD system with a radio frame according to a second TDD system so that first timing to switch from a downlink time slot of a radio frame according to the first TDD system to an uplink time slot accords with second timing to switch from a downlink time slot of a radio frame according to the second TDD system used by another base station that wirelessly communicates with the mobile station by the second TDD system different from the first TDD system to an uplink time slot.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のダウンリンク用タイムスロットからアップリンク用タイムスロットに切り替わる第１のタイミングと、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のダウンリンク用タイムスロットからアップリンク用タイムスロットに切り替わる第２のタイミングとが一致するように、第１のＴＤＤ方式の無線フレームを第２のＴＤＤ方式の無線フレームに同期させている。【選択図】図５