Mobile communication method and radio terminal

Abstract

A mobile communication method starts, at a user equipment, a discontinuous reception (DRX) operation with a DRX cycle having an On duration in which a downlink signal transmitted from a radio base station is to be monitored and an Off duration other than the On duration in a radio resource control (RRC) connected state where a RRC connection is established between the user equipment and the radio base station. The method determines, at the user equipment, a first DRX cycle to be configured to the user equipment. The Off duration of the first DRX cycle is greater than that of a second DRX cycle currently configured to the user terminal. The method transmits, from the user equipment to the radio base station, first information indicating the first DRX cycle, and the radio base station uses the first information to configure parameters for the RRC connected state to the user equipment.

What is claimed is: 
     
         1 . A mobile communication method, comprising:
 starting, at a user equipment, a discontinuous reception (DRX) operation with a DRX cycle having an On duration in which a downlink signal transmitted from a radio base station is to be monitored and an Off duration other than the On duration in a radio resource control (RRC) connected state where a RRC connection is established between the user equipment and the radio base station;   determining, at the user equipment, a first DRX cycle to be configured to the user equipment, wherein the Off duration of the first DRX cycle is greater than the Off duration of a second DRX cycle which is currently configured to the user terminal; and   transmitting, from the user equipment to the radio base station, first information indicating the first DRX cycle, wherein the first information, when transmitted to the radio base station, is used by the radio base station to configure parameters for the RRC connected state to the user equipment.   
     
     
         2 . The mobile communication method according to  claim 1 , further comprising:
 transmitting, from the user equipment to the radio base station, second information indicating that the user equipment does not give priority to configurations for improved power savings of the user equipment, in response to when the user equipment does not give priority to the configurations for improved power savings in the RRC connected state, wherein   the second information, when transmitted to the radio base station, is used by the radio base station to configure parameters on the RRC connected state to the user equipment, and   the configurations for improved power saving comprise a configuration in which the Off duration of a DRX cycle is increased relative to the Off duration of a DRX cycle presently used by the user equipment.   
     
     
         3 . A user equipment, comprising:
 at least one memory; and   at least one processor electrically coupled to the at least one memory, the at least one processor configured to cause the user equipment to   start a discontinuous reception (DRX) operation with a DRX cycle having an On duration in which a downlink signal transmitted from a radio base station is to be monitored and an Off duration other than the On duration in a radio resource control (RRC) connected state where a RRC connection is established between the user equipment and the radio base station;   determine a first DRX cycle to be configured to the user equipment, wherein the Off duration of the first DRX cycle is greater than the Off duration of a second DRX cycle which is currently configured to the user terminal; and   transmit, to the radio base station, information indicating the first DRX cycle, wherein the information, when transmitted to the radio base station, is used by the radio base station to configure parameters for the RRC connected state to the user equipment.   
     
     
         4 . A device for a user equipment, comprising:
 at least one processor configured to cause the user equipment to   start a discontinuous reception (DRX) operation with a DRX cycle having an On duration in which a downlink signal transmitted from a radio base station is to be monitored and an Off duration other than the On duration in a radio resource control (RRC) connected state where a RRC connection is established between the user equipment and the radio base station;   determine a first DRX cycle to be configured to the user equipment, wherein the Off duration of the first DRX cycle is greater than the Off duration of a second DRX cycle which is currently configured to the user terminal; and   transmit, to the radio base station, information indicating the first DRX cycle, wherein the information, when transmitted to the radio base station, is used by the radio base station to configure parameters for the RRC connected state to the user equipment.