User terminal, radio base station and radio communication method

Abstract

The present invention is designed so that a predetermined cell is activated and/or deactivated properly even when shortened TTIs are used. A user terminal, which communicates with a plurality of cells, including a given cell in which a shortened TTI having a TTI duration shorter than 1 ms is configured, has a receiving section that receives an activation command and/or a deactivation command directed to the given cell, and a control section that controls activation of the given cell based on the activation command and/or controls deactivation of the given cell based on the deactivation command, and the control section controls an operation period for activation and/or deactivation of the given cell based on the TTI duration in the given cell, or a TTI duration in a cell where the activation command and/or the deactivation command is received.

1 . A user terminal that communicates with a plurality of cells, including a given cell in which a shortened TTI having a TTI duration shorter than 1 ms is configured, the user terminal comprising:
 a receiving section that receives an activation command and/or a deactivation command directed to the given cell; and   a control section that controls activation of the given cell based on the activation command and/or controls deactivation of the given cell based on the deactivation command,   wherein the control section controls an operation period for activation and/or deactivation of the given cell based on the TTI duration in the given cell, or a TTI duration in a cell where the activation command and/or the deactivation command is received.   
     
     
         2 . The user terminal according to  claim 1 , wherein the control section makes the operation period for activation and/or deactivation of the given cell shorter than an operation period for activation and/or deactivation applied to a cell where a TTI duration is 1 ms. 
     
     
         3 . The user terminal according to  claim 1  wherein the control section controls the operation period for activation and/or deactivation of the given cell based on a TTI duration applied to a downlink channel where the activation command and/or the deactivation command is received. 
     
     
         4 . A radio base station that communicates with a user terminal connected with a plurality of cells, including a given cell in which a shortened TTI having a TTI duration shorter than 1 ms is configured, the radio base station comprising:
 a transmission section that transmits an activation command and/or a deactivation command directed to the given cell, to the user terminal; and   a receiving section that receives a UL signal transmitted from the user terminal,   wherein the receiving section controls reception of the UL signal transmitted from the user terminal based on the TTI duration in the given cell, or a TTI duration in a cell where the activation command and/or the deactivation command is transmitted.   
     
     
         5 . A radio communication method for a user terminal that communicates with a plurality of cells, including a given cell in which a shortened TTI having a TTI duration shorter than 1 ms is configured, the radio communication method comprising:
 receiving an activation command and/or a deactivation command directed to the given cell; and   controlling activation of the given cell based on the activation command and/or controlling deactivation of the given cell based on the deactivation command,   wherein the user terminal controls an operation period for activation and/or deactivation of the given cell based on the TTI duration in the given cell, or a TTI duration in a cell where the activation command and/or the deactivation command is received.