Device, system, and method of power saving in wireless network. For example, a method includes: receiving from a wireless access point a wireless communication signal indicting wireless network load information represented as a value of a parameter in a Basic Service Set load information element, wherein the parameter comprises a parameter selected from a group consisting of: a station count parameter, a channel utilization ratio parameter, an available admission control parameter, a network congestion parameter, a transmission power suggestion parameter, a reception power suggestion parameter, and a late adaptation suggestion parameter; and modifying a power consumption mode of a communication unit of a wireless communication device based on said parameter.