| CPC H04W 24/08 (2013.01) [H04W 64/00 (2013.01)] | 19 Claims |

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1. A network access device, the network access device comprising:
a memory having one or more instructions stored thereon; and
a processor, configured to execute the instructions stored in the memory to cause the network access device to:
monitor changes in channel state between each user equipment of a plurality of user equipment and the network access device;
store and update a list of static user equipment, the list of static user equipment comprises one or more of the user equipment of the plurality of user equipment identified based on the monitored changes in the channel state during a first time period being smaller than a first threshold;
group two or more user equipment from the list of static user equipment into at least one first sounding group based on sounding grouping criteria; and
perform channel sounding on user equipment in the at least one first sounding group at a second channel sounding frequency lower than a first channel sounding frequency at which channel sounding on the plurality of user equipment is performed in the absence of the list of static user equipment.
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