Various embodiments relate to a system and method for joint sounding by a client with a master access point (AP) and a slave (AP), including: receiving a message from the master AP; applying network allocation vector (NAV) rules to update a NAV values, wherein the received message is treated as an intra-basic service set (BSS) message when the transmit address (TA) of the received message has a prespecified value; receiving a first trigger frame; and transmitting a first channel state information (CSI) to the master AP when the channel is idle based upon the updated NAV value in response to the trigger frame.