Communication terminal device, base station, and communication method
First Claim
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1. A communication terminal that performs bidirectional communication using different frequencies for transmission and reception, comprising:
- a receiving unit receives a reception signal that is transmitted from a base station at a constant interval;
a detecting unit detects a reception start time comprising an arrival time of a first wave of a pilot channel of a reception period during which the reception signal is received by the receiving unit, and also detects an assignment of a transmission opportunity and a reception opportunity;
an adjusting unit adjusts, by offsetting the arrival time, a transmission start time of a transmission period during which a transmission signal is to be transmitted, so that the transmission start time coincides with the reception start time; and
a transmitting unit starts a transmission of the transmission signal to the base station at the adjusted transmission start time, whereinaccording to the assignment of the transmission opportunity and the reception opportunity, the receiving unit receives the reception signal and the transmitting unit transmits the transmission signal at the same time based on the adjusted transmission start time.
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Abstract
In a communication terminal that performs bidirectional communication using different frequencies for transmission and reception, a receiving unit receives reception signals transmitted from the base station, a detecting unit detects the timing of DL when the receiving unit receives the reception signals, an adjusting unit adjusts the timing of UL to transmit the transmission signals so as to synchronize the timing of the DL 101 and the timing of the UL, and a transmitting unit transmits transmission signals to the base station based on the timing of UL adjusted.
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Citations
11 Claims
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1. A communication terminal that performs bidirectional communication using different frequencies for transmission and reception, comprising:
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a receiving unit receives a reception signal that is transmitted from a base station at a constant interval; a detecting unit detects a reception start time comprising an arrival time of a first wave of a pilot channel of a reception period during which the reception signal is received by the receiving unit, and also detects an assignment of a transmission opportunity and a reception opportunity; an adjusting unit adjusts, by offsetting the arrival time, a transmission start time of a transmission period during which a transmission signal is to be transmitted, so that the transmission start time coincides with the reception start time; and a transmitting unit starts a transmission of the transmission signal to the base station at the adjusted transmission start time, wherein according to the assignment of the transmission opportunity and the reception opportunity, the receiving unit receives the reception signal and the transmitting unit transmits the transmission signal at the same time based on the adjusted transmission start time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11)
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8. A communication method of a communication terminal that performs bidirectional communication using different frequencies for transmission and reception, comprising:
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receiving a reception signal that is transmitted from a base station at a constant interval; detecting a reception start time comprising an arrival time of a first wave of a pilot channel of a reception period during which the reception signal is received, and also detecting an assignment of a transmission opportunity and a reception opportunity; adjusting, by offsetting the arrival time, a transmission start time of a transmission period during which a transmission signal is to be transmitted, so that the transmission start time coincides with the reception start time; and starting a transmission of the transmission signal to the base station at the adjusted transmission start time, wherein according to the assignment of the transmission opportunity and the reception opportunity, the communication terminal receiving the reception signal and transmitting the transmission signal at the same time based on the adjusted transmission start time.
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Specification