Radio terminal, radio communication system, and radio base station

摘要

A radio terminal comprises a communication unit, a measurement unit, a measurement unit, and a control unit. The communication unit selects the CDMA or OFDM scheme as a communication scheme to be used in a cell formed by a radio base station and performs radio communication. The measurement unit measures the receiving quality relating to the time difference between the preceding and delayed wave of a received signal in the OFDM scheme and measures the receiving quality of a received signal in the CDMA scheme. When the OFDM scheme is used in an idle state, when the receiving quality relating to the time difference which is obtained by the measurement unit is deteriorated below a threshold value corresponding to a guard interval used in the OFDM scheme, the control unit causes the measurement unit to measure the receiving quality of the received signal in the CDMA scheme.

主权项

1. A radio terminal comprising:
a transceiver that performs radio communication by selecting any of a Code Division Multiple Access (CDMA) scheme and an Orthogonal Frequency Division Multiplexing (OFDM) scheme as a used communication scheme to be used in a cell formed by a radio base station; and a processor that controls measuring reception quality of a reception signal of the OFDM scheme and measuring reception quality of a reception signal of the CDMA scheme; wherein, while the OFDM scheme is selected as the used communication scheme, the processor controls measuring the reception quality of the reception signal of the CDMA scheme only when both the user terminal is in an idle state and the reception quality measured in the OFDM scheme is less than a first threshold used in the OFDM scheme, and wherein, when both the user terminal is in the idle state and a reception quality measured in the CDMA scheme is greater than a second threshold, the processor controls reselecting a cell formed by a radio base station supporting the CDMA scheme, and controls the transceiver to cause the transceiver to switch the used communication scheme from the OFDM scheme to the CDMA scheme.