Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2005-07-05
2005-07-05
Tieu, Binh Kien (Department: 2643)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C370S216000, C370S231000, C370S253000, C375S222000
Reexamination Certificate
active
06915127
ABSTRACT:
A radio base station is disclosed that monitors faults of radio communication modems based on the content of received frames that are received during call connection. The radio communication modems are mounted in units of prescribed number on signal converters of card structure and are assigned to correspond to mobile stations that perform call connections. The radio base station uses fault detection data to check the content of frames that are received during call connections for each radio communication modem, and counts the total number of received frames and the number of frames in which faults are detected. Upon termination of a call connection, the radio base station determines whether or not a fault has occurred in a radio communication modem based on the counted ratio of the number of frames in which faults are detected to the total number of received frames, and if a fault has occurred, attempts recovery control. If a radio communication modem does not recover, the radio base station deletes the radio communication modem as a candidate for next assignment. The radio base station further transmits, to maintenance personnel through the radio base station controller, a message prompting exchange of a signal conversion card in which the number of faulty radio communication modems reaches or exceeds a particular number.
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Dickstein Shapiro Morin & Oshinsky LLP.
NEC Corporation
Tieu Binh Kien
LandOfFree
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