A communications apparatus is provided. In one implementation, the apparatus includes a processor, coupled to a transceiver. The transceiver receives one or more configuration messages carrying information regarding to a first sub-frame subset, a second sub-frame subset and a plurality of reporting parameters from a peer communications apparatus. The processor further includes a first processor logic unit, for obtaining the information regarding at least the first sub-frame subset, the second sub-frame subset and the reporting parameters configured by the peer communications apparatus, a second processor logic unit, for determining at least one reporting instance according to the reporting parameters for reporting a measurement result linked to the first sub-frame subset; and a third processor logic unit, for determining a measuring instance for measuring the power of a desired signal corresponding to the first sub-frame subset based on the reporting instance.