Fujitsu Corporation

Hitoshi Koike

Keiichi Nakatsugawa

Fumiyuki Iizuka

Nobutsugu Fujino

Itaru Nakagawa

Koji Ogawa

Yoshiyuki Seguchi

Kazuhiro Muraoka

Ryuichi Sato

Hidetoshi Abeta

Hiraku Koganemaru

Masahiko Fuse

Tatsuya Wakuta

Takeshi Kamura

Tohru Nakahara

Naotaka Tsuji

Zenichi Yashiro

A communication system includes a control device, a first base station, and a second base station, wherein the first base station and the second base station are execute an S2 handover process, and after the S2 handover process, the first base station and the second base station execute an X2 handover process, the first base station transmits address information of the first base station to the second base station via the control device when the first base station executes the S2 handover process to the second base station, the second base station stores the received address information of the first base station, and transmits a connection request to the first base station based on the received address information of the first base station, and the first base station establishes a connection for the X2 handover process in response to the connection request.

Communication system, method of handover and base station

There is provided a mobile communication system, a base station, and a method of controlling cell coverage that is capable of operating a mobile communication system such that the cell coverage is maintained approximately and timely at a target level without requiring much labor. In this mobile communication system, a mobile station reports to the base station the position information of the mobile station and the value of reception power of reference signal from the base station. The base station obtains the measured cell coverage as a result of measurement of cell coverage based on the position information and the value of reception power from the mobile stations, and controls at least one of plural parameters including transmission power to the mobile stations, tilt angle of antenna, etc., so as to minimize deviation of the measured cell coverage from the target cell coverage.

Mobile communication system, base station, cell coverage control method

A mobile node is arranged to perform a high-quality hand-over operation for eliminating an interruption time in communication and keeping the continuance of communication excellent. The mobile node has a function of interfacing with networks and includes a network quality monitor, a hand-over controller, and a network controller. The network quality monitor operates to monitor a network quality based on at least one of an intensity and a radio bandwidth of a radio wave received by network devices. The hand-over controller performs the hand-over operation of transmitting a care of address to an address registering destination in response to a state of the network quality before a communication is disconnected, changing a route of communication information, and switching a connecting destination into a new network. The network controller receives a response that indicates an update of the care of address in the address registering destination and keeping a function of receiving data from the network before being switched until the communication is disconnected.

Mobile node

A method and a wireless communication control apparatus for handing off a mobile station in a mobile communication system including at least two wireless base stations. A handoff threshold which is set in the mobile station is varied according to quality of a wireless link between the mobile station and a first wireless base station which currently controls the mobile station. Then, the processing for handing off the mobile station from the first wireless base station to a second wireless base station is performed based on the handoff threshold.

Method and apparatus for performing handoff by varying threshold level

Growing community of inventors

Yokohama, Japan

Hitoshi Koike