Fujitsu Corporation

Yuji Munakata

Hideaki Yoshida

Sachito Shibata

When a first MS control signalling device that controls a mobile station fails, a second MS control signalling device takes over the processing of the first MS control signalling device. The second MS control signalling device requests a RLC parameter necessary for communication of the mobile station, and the mobile station transmits the requested RLC parameter to the second MS control signalling device. The second MS control signalling device controls communication of the mobile station, using the obtained RLC parameter. A data path for transmitting user data of the mobile station is not released but is held when the MS control signalling devices are switched.

Recovery method and radio network controller in radio communication system

An ATM switch comprises a detector that detects impairments in signal lines, and a controller that controls the preservation of paths that have been established by call control via a signal line when an impairment has been detected on a signal line by the detector. When an impairment has occurred only on a signal line, interruptions in communications services are prevented by causing the data line paths to be preserved rather than released.

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Kawasaki, Japan

Yuji Munakata