Receiving device, semiconductor integrated circuit, transmitting/receiving device, transport apparatus portable transmitting/receiving device, communication system and receiving method
First Claim
1. A receiving device for receiving a signal transmitted from a base station, the device comprising:
- a receiver circuit for outputting a reception electric field intensity of a signal received via an antenna as a reception electric field intensity signal;
a comparator circuit for comparing a level of the reception electric field intensity signal output from the receiver circuit using a first threshold indicating that the receiving device is in a communication area and a second threshold which is lower than the first threshold and indicates a continuous field measurement level and outputting a result of the comparison;
an intermittent reception control circuit for outputting a periodic signal for intermittently operating the receiver circuit; and
an operation control circuit for controlling an operation of the receiver circuit based on a comparison result of the comparator circuit,wherein, based on the comparison result of the comparator circuit, if the level of the reception electric field intensity signal is lower than the second threshold, the operation control circuit makes the receiver circuit perform intermittent operation based on the periodic signal and if the level of the reception electric field intensity signal is equal to or higher than the second threshold, the operation control circuit makes the receiver circuit perform a continuous operation.
2 Assignments
0 Petitions
Accused Products
Abstract
A receiving device includes a receiver circuit for outputting a received signal as a reception electric field intensity signal, an operation control circuit for controlling an operation of the receiver circuit, and an intermittent reception control circuit for outputting a periodic signal. A comparator circuit holds a first threshold indicating that the receiving device has entered a communication area and a second threshold indicating a start of a continuous electric field intensity measurement. If the reception electric field intensity signal is lower than the second threshold, the operation control circuit makes the receiver circuit perform intermittent operation. If the reception electric field intensity signal is equal to or higher than the second threshold, the operation control circuit makes the receiver circuit perform a continuous operation. If the reception electric field intensity signal is equal to or higher than the first threshold, the operation control circuit makes the demodulation circuit perform an operation.
24 Citations
45 Claims
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1. A receiving device for receiving a signal transmitted from a base station, the device comprising:
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a receiver circuit for outputting a reception electric field intensity of a signal received via an antenna as a reception electric field intensity signal; a comparator circuit for comparing a level of the reception electric field intensity signal output from the receiver circuit using a first threshold indicating that the receiving device is in a communication area and a second threshold which is lower than the first threshold and indicates a continuous field measurement level and outputting a result of the comparison; an intermittent reception control circuit for outputting a periodic signal for intermittently operating the receiver circuit; and an operation control circuit for controlling an operation of the receiver circuit based on a comparison result of the comparator circuit, wherein, based on the comparison result of the comparator circuit, if the level of the reception electric field intensity signal is lower than the second threshold, the operation control circuit makes the receiver circuit perform intermittent operation based on the periodic signal and if the level of the reception electric field intensity signal is equal to or higher than the second threshold, the operation control circuit makes the receiver circuit perform a continuous operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method for receiving a signal using a receiving device for receiving a signal transmitted from a base station, the method comprising:
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a first step of receiving the signal via an antenna by a receiver circuit; a second step of outputting a reception electric field intensity of the received signal as a reception electric field intensity signal from the receiver circuit; a third step of comparing the level of the reception electric field intensity signal with a first threshold indicating that the receiving device is in a communication area and a second threshold which is lower than the first threshold and indicates a continuous field measurement start level; a fourth step of making, if the level of the reception electric field intensity signal is lower than the second threshold, as a result of the comparison, the receiver circuit perform an intermittent operation; and a fifth step of making, if the level of the reception electric field intensity signal is equal to or higher than the second threshold, as a result of the comparison, the receiver circuit perform a continuous operation. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification