User terminal and radio communication method

Abstract

The present invention is designed so that, when a plurality of user terminals with different numerologies are multiplexed in the same carrier, the effect of latency reduction can be achieved effectively. According to the present invention, a user terminal has a receiving section that receives a downlink (DL) signal in a carrier in which a plurality of user terminals with different numerologies are multiplexed, a transmission section that transmits the retransmission control information of the DL signal, and a control section that configures a retransmission control subframe based on the same numerology among the plurality of user terminals, and controls transmission of the retransmission control information in the retransmission control subframes. In another aspect, a radio communication method is also disclosed.

1 . A user terminal comprising:
 a receiving section that receives a downlink (DL) signal in a carrier in which a plurality of user terminals with different numerologies are multiplexed;   a transmission section that transmits a retransmission control information of the DL signal; and   a control section that configures a retransmission control subframe based on a same numerology among the plurality of user terminals, and controls transmission of the retransmission control information in the retransmission control subframe.   
     
     
         2 . The user terminal according to  claim 1 , wherein the numerology of the retransmission control subframe is a numerology in which a subframe length is shortest among the numerologies of the plurality of user terminals. 
     
     
         3 . The user terminal according to  claim 1 , wherein the control section configures the retransmission control subframe periodically or aperiodically, at intervals longer than a longest subframe length among the numerologies of the plurality of user terminals. 
     
     
         4 . The user terminal according to  claim 1 , wherein the transmission section transmits the retransmission control information in the retransmission control subframe when a numerology of the DL signal and the numerology of the retransmission control subframe are equal. 
     
     
         5 . The user terminal according to  claim 1  wherein, when a numerology of the DL signal is different from the numerology of the retransmission control subframe, the control section controls transmission of the retransmission control information in the retransmission control subframe based on a latency requirement level. 
     
     
         6 . A radio communication method for a user terminal in a carrier in which a plurality of user terminals with different numerologies are multiplexed, the radio communication method comprising:
 receiving a downlink (DL) signal;   configuring a retransmission control subframe based on a same numerology among the plurality of user terminals; and   controlling transmission of a retransmission control information in the retransmission control subframe.   
     
     
         7 . The user terminal according to  claim 2 , wherein the control section configures the retransmission control subframe periodically or aperiodically, at intervals longer than a longest subframe length among the numerologies of the plurality of user terminals. 
     
     
         8 . The user terminal according to  claim 2 , wherein the transmission section transmits the retransmission control information in the retransmission control subframe when a numerology of the DL signal and the numerology of the retransmission control subframe are equal. 
     
     
         9 . The user terminal according to  claim 3 , wherein the transmission section transmits the retransmission control information in the retransmission control subframe when a numerology of the DL signal and the numerology of the retransmission control subframe are equal. 
     
     
         10 . The user terminal according to  claim 2  wherein, when a numerology of the DL signal is different from the numerology of the retransmission control subframe, the control section controls transmission of the retransmission control information in the retransmission control subframe based on a latency requirement level. 
     
     
         11 . The user terminal according to  claim 3  wherein, when a numerology of the DL signal is different from the numerology of the retransmission control subframe, the control section controls transmission of the retransmission control information in the retransmission control subframe based on a latency requirement level. 
     
     
         12 . The user terminal according to  claim 4  wherein, when a numerology of the DL signal is different from the numerology of the retransmission control subframe, the control section controls transmission of the retransmission control information in the retransmission control subframe based on a latency requirement level.