Hitachi, Ltd.

Hitachi Computer Engineering Co., Ltd.

Other

Takaharu Aoyama

Hidehiko Jusa

Kenichiro Orita

Tomoaki Ishifuji

Kazuo Sugai

Nobuhito Matsuyama

Masaaki Shida

Masato Hirai

Atsushi Anzai

Hirokatsu Shioda

Toshimi Sugita

Tsuyoshi Katoh

An information processing unit having a bus controller connected to a plurality of different shared buses which can independently control the different shared buses, and a double adaptor connected to the different shared buses which can independently control the different shared buses, wherein first and second ones of the shared buses are independently controlled to send data from the bus controller to the double adaptor, and from the double adaptor to the bus controller, respectively.

Information processing unit for separately controlling a plurality of shared buses

A frequency-hopped mobile communication system is disclosed, in which a mobile wireless station automatically becomes a base station in accordance with the surrounding conditions, thereby automatically reconfiguring a communication network. A control frame is generated by at least one master station, and frequencies are hopped by a plurality of slave stations in accordance with the control frame. Each slave station switches the master thereof to be tracked, in accordance with the receiving conditions of the control frame and the relation between the control frame received from the master station and the status of the slave station and decides in which mode, master station or slave station, the slave station is to operate. The cells are thus automatically reconfigured.

Frequency-hopped wireless communication system and mobile wireless

In a wireless LAN system, each wireless terminal device determines whether or not the wireless terminal device has entered into a wireless LAN domain established by a base station, and if it has entered, transmits an entry terminal identification information update control frame including identification information of its own device to the base station at a predetermined time interval. The base station receives the entry terminal identification information update control frame from the wireless terminal device, stores in a storage the identification information of the wireless terminal device entered into the wireless LAN domain established by its own base station, and when it receives an information frame from a wired transmission line connected to its own base station, relay-transmits only the information frame to the wireless terminal device having the identification information thereof stored in the storage by referring the information stored in the storage.

Wireless LAN system, base station device and wireless terminal device

Growing community of inventors

Atsugi, Japan

Takaharu Aoyama