A communications apparatus and method for camping on a serving cell. The apparatus includes a radio frequency (RF) signal processing device, processing a plurality of RF signals to generate a plurality of baseband signals, a baseband signal processing device, processing the baseband signals, and a processor, determining whether a first predetermined threshold value related to cell reselection of the serving cell is greater than a second predetermined threshold value related to cell reselection of a predetermined neighbor cell, and when the first predetermined threshold value is greater than the second predetermined threshold value, determining not to perform cell reselection to reselect to the predetermined neighbor cell and determining to perform at least one radio activity instead in a predetermined period of time reserved for performing the cell reselection.