Hitachi, Ltd.

Hitachi Communication Technologies, Ltd.

Kddi Corporation

Masato Inagaki

Hideo Aoe

Tsutomu Uchida

Hiroshi Tamaribuchi

Akira Yamaguchi

Satoshi Masuda

Manabu Yoshimura

Shirou Mazawa

Tsuyoshi Taniguchi

Yoshio Takauchi

A radio communication terminal, being used in a radio communication systems in which the transmission rate varies depending on radio wave conditions and communication statuses of other users, comprises a reception module which receives packets transmitted by a base station in an idle state of the radio communication terminal, a signal processing module which estimates a transmission rate available in communication based on the packets received by the reception module, and a display module which displays information indicating the transmission rate estimated by the signal processing module.

Method and apparatus for determining transmission rate based on number of unused slots

In a mobile communication system, a base station controller has a handoff information management table for storing distance information for each mobile station notified from each of base stations and a detection unit for updating the handoff information management table each time a new handoff information was received from the base stations and detecting any of the mobile stations that is moving out of a service area into an out-of-communication range. The detection unit performs the out-of-range detection by selecting any of the mobile stations currently communicative only with one or more of the border cell base stations as a detection target and comparing the distance information in the handoff information management table with a predetermined threshold value.

Mobile communication system detectable mobile station moving out of communication range

Radio communication terminal and communication method

A method of controlling hand over that reliably performs SHO even when there exists discrepancy between a range of a cell or sector and a range in which communication is possible. A reference value, which is compared with a received level of a perch channel signal for judging timing of starting and ending SHO, is corrected by using a correction value prepared for each combination of an SHO source cell and an SHO destination cell. The reference value is corrected such that SHO is started when the mobile stationarrives at a range in which the mobile stationcan communicate with a base stationthat covers the SHO destination candidate cell, and the hand over is ended when the mobile stationcomes out of a range in which the mobile stationcan communicate with a base station that covers the SHO source cell.

Hand over control method, base station controller and mobile terminal

Growing community of inventors

Fujisawa, Japan

Masato Inagaki