Radio terminal and fault detection method
AssigneesDenso Corporation, Ntt Docomo, Inc.
InventorsRyohei Kataoka, Hisashi Takeshita, Hiroyuki Itazu, Mio Okamoto
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Abstract
Method for detecting transmission power faults in cellular telephones without detecting transmission power. A microcomputer compares a criteria B with an absolute value |Pi−Pc| of the differential between initial transmission power value Pi and transmission power concentration value PC. A transmission power fault is determined to have occurred when the absolute value 51 Pi−Pc| is larger than criteria B (|Pi−Pc|>B), so transmission power faults can be detected without detecting the transmission power.
Claims9
A radio terminal with transmission power for transmission to a base station controlled by a base station, wherein the radio terminal comprises:
- means for determining and storing a transmission power concentration value when the transmission power controlled by the base station has been concentrated,
- first fault detecting means for detecting the transmission power fault based on the stored concentration value;
- output means for outputting a signal for transmission to the base station at a controlled transmission power.
- signal detecting means for detecting the signal output from the output means, wherein the first fault detecting means can be used for detecting faults in the transmission power when the controlled transmission power cannot be detected by the signal detecting means;
- and
- second fault detecting means for detecting transmission power faults based on the signal detected by the signal detecting means when the controlled transmission power is capable of being detected by the signal detecting means.
A fault detection method for a radio terminal that transmits to a base station, wherein the transmission power of the radio terminal is controlled by the base station, and wherein the method comprises:
- storing a concentration value for the concentrated transmission power when the transmission power controlled by the base station is concentrated;
- outputting a signal for transmission to the base station at a controlled transmission power;
- detecting faults in the transmission power based on the stored concentration value when the controlled transmission power cannot be detected;
- and
- detecting faults in the transmission power based on the signal when the controlled transmission power is capable of being detected.
Dependencies are inferred from the claim text.