Terminal device, and in-zone cell checking method and cell re-selection method thereof

A terminal device including a radio unit which adopts code division multiple access (cdma), wherein

• said radio unit including an RRC (Radio Resource Controller), and
• said RRC starts cell re-selection in each predetermined cell re-selection cycle and when an in-zone cell remains unchanged before and after said cell re-selection, extends said cell re-selection cycle, wherein
• said radio unit further including a measurement unit, wherein
• said RRC outputs an in-zone cell monitoring start instruction to said measurement unit at the start of said cell re-selection and collates a reported in-zone cell received from said measurement unit and an in-zone cell obtained at the time of output of said monitoring start instruction to determined whether said cell re-selection cycle is to be extended, and
• said measurement unit records a cell which becomes an in-zone cell for a desired period of time in response to said monitoring start instruction and counts the number of times when the cell becomes an in-zone cell to specify said reported in-zone cell based on the count result and send the obtained result to said RRC.