A radio terminal (1; 12) configured to perform radio communication with a base station, comprising: a communication unit (1a; 21) configured to perform discontinuous reception, DRX, during which radio measurement and monitoring of a paging signal of the base station are performed in DRX cycles; and a control unit (1b; 22) configured to: control the communication unit (1a; 21) to perform a Non-Access Stratum, NAS, Attach procedure that includes transmitting an NAS Attach Request to the base station and, in response, receiving an NAS Attach Accept from the base station, wherein the NAS Attach Accept specifies a period of time during which DRX is to be performed next by the radio terminal (1; 12), control the communication unit (1a; 21) to perform the radio measurement and the monitoring of a paging signal in a DRX cycle during the period of time specified by the NAS Attach Accept, and after the communication unit (1a; 21) has performed the radio measurement and the monitoring of the paging signal in the DRX cycle during the period of time specified by the NAS Attach Accept, control the communication unit (1a; 21) to stand by for an event to occur in an application layer of the radio terminal (1; 12), wherein the communication unit (1a; 21) is configured to transmit an event report to the base station when the event occurs, wherein the control unit (1b; 22) is configured to perform the radio measurement and the monitoring of a paging signal within each DRX cycle after the event has occurred. a communication unit (1a; 21) configured to perform discontinuous reception, DRX, during which radio measurement and monitoring of a paging signal of the base station are performed in DRX cycles; and a control unit (1b; 22) configured to: control the communication unit (1a; 21) to perform a Non-Access Stratum, NAS, Attach procedure that includes transmitting an NAS Attach Request to the base station and, in response, receiving an NAS Attach Accept from the base station, wherein the NAS Attach Accept specifies a period of time during which DRX is to be performed next by the radio terminal (1; 12), control the communication unit (1a; 21) to perform the radio measurement and the monitoring of a paging signal in a DRX cycle during the period of time specified by the NAS Attach Accept, and after the communication unit (1a; 21) has performed the radio measurement and the monitoring of the paging signal in the DRX cycle during the period of time specified by the NAS Attach Accept, control the communication unit (1a; 21) to stand by for an event to occur in an application layer of the radio terminal (1; 12), wherein the communication unit (1a; 21) is configured to transmit an event report to the base station when the event occurs, control the communication unit (1a; 21) to perform a Non-Access Stratum, NAS, Attach procedure that includes transmitting an NAS Attach Request to the base station and, in response, receiving an NAS Attach Accept from the base station, wherein the NAS Attach Accept specifies a period of time during which DRX is to be performed next by the radio terminal (1; 12), control the communication unit (1a; 21) to perform the radio measurement and the monitoring of a paging signal in a DRX cycle during the period of time specified by the NAS Attach Accept, and after the communication unit (1a; 21) has performed the radio measurement and the monitoring of the paging signal in the DRX cycle during the period of time specified by the NAS Attach Accept, control the communication unit (1a; 21) to stand by for an event to occur in an application layer of the radio terminal (1; 12), wherein the communication unit (1a; 21) is configured to transmit an event report to the base station when the event occurs, wherein the control unit (1b; 22) is configured to perform the radio measurement and the monitoring of a paging signal within each DRX cycle after the event has occurred.