The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2008
Filed:
Aug. 27, 2004
Katsushi Miyawaki, Yokohama, JP;
Yuuichi Takahashi, Yokohama, JP;
Katsushi Miyawaki, Yokohama, JP;
Yuuichi Takahashi, Yokohama, JP;
Hitachi Communication Technologies, Ltd., Tokyo, JP;
Hitachi Hybrid Network Co., Ltd., Yokohama-Shi, JP;
Abstract
In the case of radio base stations of different kinds, a synchronization in a radio section cannot be established so that the efficiently effective use of electric waves cannot be retained. According to the invention, therefore, there is provided a TDMA type mobile communication systemcomprising: a plurality of radio base stations of different system kinds (i.e., a general type radio base station, an IP connection type radio base stationand a main digital cordless phone); mobile phonesA andB wirelessly connected with the plural radio base stations; and a private branch exchangewired with the radio base stations. The radio base station receives, when a synchronized operation mode is decided, a frame signal containing a control CH signal, from a reference radio base station (i.e., a reference station); and times the transmission of the frame signal of a local station to the transmission position of the control CH signal in the frame signal, thereby to establish a frame synchronization in a radio section between own station and the reference radio base station.