The present disclosure relates to a network access device and method for the same, medium and program product. A network access device, comprising: a memory storing instructions; and a processor executing at least the following operations: monitoring changes in channel state between user equipment and a network access device; storing and updating the list of static user equipment from the user equipment, wherein a monitored change in a channel state during a first time period is smaller than a first threshold; grouping two or more user equipment in the list of static user equipment into at least one first sounding group based on sounding grouping criteria; and performing channel sounding, in the absence of the list of static user equipment, for the at least one first sounding group at a second channel sounding frequency lower than a first channel sounding frequency.