Sharp Kabushiki Kaisha Corporation

Akio Yoshihara

Shinichi Sawada

Shigeto Suzuki

Hirokazu Kobayashi

Kohki Suzuki

Yuhsuke Takagi

Tadashi Shimonabe

Mitsuru Sakamoto

Shumpei Fuse

Kouki Suzuki

Koki Suzuki

A wireless communication system allows a handover operation to a base station communicating through a plurality of frequency bands. The mobile terminal includes a communication unit adapted to perform communication with any of the base stations through a plurality of frequency bands. The communication unit of the base station notifies, when communication through a plurality of frequency bands is possible, a mobile terminal about information directed to identifying a main frequency band from relevant frequency bands in a manner allowing discrimination from one or more frequency bands other than the main frequency band. The communication unit of the mobile terminal determines that, upon receiving information directed to identifying a main frequency band from the second base station during having communication connection with the first base station, that the frequency band identified by the relevant information is a subject of handover towards the second base station.

Wireless communication system, communication method, base station, and mobile terminal

A mobile communication system includes: a plurality of mobile communication terminals; and a first base station device configured to wirelessly communicate with the plurality of mobile communication terminals. The first base station device is configured to report to the plurality of mobile communication terminals that a second base station device allowing only a particular mobile communication terminal access is set to allow all the plurality of mobile communication terminals access, by transmitting using cell broadcast service, identification information of the second station device.

Mobile communication system, base station device, and mobile communication terminal

The mobile station device has: a first step of selecting a plurality of base station devices meeting a predetermined handover condition, based on reception levels of a plurality of signals transmitted from the plurality of base station devices; and a second step of reselecting, if the plurality of base station devices selected in the first step include a plurality of base station devices for specific subscribers, a base station device to be accessed from among the plurality of base station devices for specific subscribers, by using a predetermined correlation between frequencies and priorities. Accordingly, the number of frequencies can be reduced, and the ping-pong phenomenon can be suppressed.

Cell reselecting method and mobile station device

A priority storing unit (b) stores, for each of frequency bands predetermined, a priority for accessing a base station device using associated one of the frequency bands. A service type determining unit (b) chooses, based on identification information received from the at least one first base station device, which of the first and second services to receive from each of the at least one first base station device. A priority determining unit (b) determines, based on a type of a connection service chosen by the service type determining unit (b), a priority for each of the frequency bands which is used by the at least one first base station device, and to update the priority stored by the priority storing unit (b) based on the priority determined. A selection evaluator (b) selects a base station device to access, based on the priority updated by the priority determining unit (b) and a reception level of a reception signal for each of the frequency bands which is received from each of the base station devices.

Communication system, mobile station device, connection destination evaluating method, connection destination evaluating program, and base station device

A mobile communication system includes: a mobile station device; a first base station device to which an accessible time is set; and a second base station device. If the mobile communication system detects that a time according to the accessible time elapses and if the mobile station device is in communication with the first base station device, the mobile communication system performs a handover to switch a communication connection between the mobile station device and the first base station device to a communication connection between the mobile station device and the second communication device. Accordingly, disconnection of a call is prevented from occurring if the communication device is in communication with the first base station device when the accessible time expires.

Mobile communication system, base station device, mobile station device, and handover method

A wireless communication system includes: a macrocell base station device; a micro base station device serving a cell having a region including at least a part of a region of a cell served by the macrocell base station device; and a mobile station device. One of the macrocell base station device and the micro base station device includes a reporter configured to report, to the mobile station device, micro base station information indicating the micro base station device to which the mobile station device can perform a handover. The mobile station device includes a handover destination selector configured to select a handover destination based on the micro base station information reported. Thereby, a handover is prevented while preventing the processing load on the mobile station device.

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Osaka, Japan

Akio Yoshihara