Hitachi, Ltd.

Yoshiyuki Machida

Yuichiro Katsu

Masao Hayama

Shirou Mazawa

Fumihiko Shimazaki

Kouichi Shiraishi

Kouhei Matsuzawa

Hiroshi Shouda

Adjacent station information of various base stations communicating using CDMA is automatically updated. A maintenance apparatus () includes a protocol message acquisition unit () for acquiring protocol messages transmitted between each base station and a mobile terminal; a protocol message storage area () for storing the protocol messages; a base station information acquisition unit () for acquiring base station information of every base station; a base station information storage area () for storing the base station information of all the base stations; and an information update instruction unit (). The information update instruction unit () extracts a Route Update message at the time of hard handoff from the protocol message storage area (), and uses communication characteristic information of a handoff candidate base station included in that message, in order to specify the handoff candidate base station among base stations whose base station information is stored in the base station information storage area (). The information update instruction unit () instructs the handoff source base station to add the information on the specified handoff candidate base station to its adjacent station information.

Radio communication system, adjacent station information management method for this system, and management apparatus therefor

A radio communication system arranged to deliver multimedia information into a plurality of mobile stations is arranged to deliver the multimedia information according to the wave circumstances of each mobile station, layer the information components composing the multimedia information, create the frame containing the layered information components and the transmission priorities of the components, connect the frames on a multimedia information unit, and then transmit the connected frames to a base station.

Base station apparatus, mobile station, and contents provider

Growing community of inventors

Kawasaki, Japan

Yoshiyuki Machida