Hitachi, Ltd.

Takeshi Maki

Toshiro Suzuki

Yuji Fukai

Kenichi Aoyama

Tsutomu Kusaki

Shiro Tanabe

Ken Nanjo

Toshiya Ouchi

Yasushi Shiina

A mobile radio communications system having a plurality of base stations accommodating a plurality of mobile stations through radio transmission channels, each of the base stations being connected to a mobile communications exchanger through a plurality of signal lines. Each of the base stations is provided therein with a signal line allocating function unit for selecting a particular signal line from a plurality of signal lines and for allocating a communication slot for a mobile station dominated by the base station at a particular slot position on the selected signal line, a radio channel allocating function unit for allocating a communication slot for the mobile station dominated by the base station at a particular slot position on a radio transmission channel at a particular frequency, and a radio signal delay control unit for performing delay control for a timing at which the base station transmits a radio signal to the mobile station dominated by the base station.

Mobile radio communications system

A mobile communication network is provided with a plurality of base stations each of which communicates with a plurality of mobile stations, a plurality of base station controllers (BSC) or control stations each of which is connected to a group of base stations, and switching centers each of which is connected to a plurality of BSC's. The BSC's are interconnected by an exclusive network and terminal information of the mobile stations are stored by the respective local service points (SCP) of the BSC's in a decentralized manner. When an authentication processing and the retrieval of location data for a mobile station is to be made by each BSC and in the case where necessary terminal information is not held in the local SCP of that BSC, the BSC broadcasts a request message for transfer of terminal information or vicarious execution of authentication processing to other BSC's through the exclusive network and waits for a response message from a BSC in which the necessary terminal information is held.

Mobile communication network and control method thereof

A slots assignment method for a control channel signal in a mobile telecommunication system employing a time division multiple access/time division duplex (TDMA-TDD) system having a plurality of base stations each having at least one mobile station. Each of the base stations detects a control-channel signal transmitted from other base stations and a control-channel signal transmitted from the mobile station throughout a plurality of multiple frame periods, discriminates down-link control-channel slots from up-link control-channel slots being used by other base stations, selects, as optimum down-link control-channel slot candidates, ones of idle slots of idle slot blocks other than the down and up-link control-channel slots being used by other base stations with use of a predetermined evaluation function, and assigns one of the selected idle slots as a down-link control-channel slot of its own base station.

Slots assignment method for control channel signal in mobile

Growing community of inventors

Yokohama, Japan

Takeshi Maki