A sharing AP (110) is configured to share a transmission opportunity, TXOP, with a shared AP (120, 130) within a Multi-AP set for participating in a coordinated transmission, wherein the sharing AP (110) is configured to communicate with one or more stations (115a-c) associated with the sharing AP via one or more spatial streams and the shared AP is configured to communicate with one or more stations (125a, b) associated with the shared AP via one or more further spatial streams. The sharing AP comprises a communication interface (113) configured to transmit a frame to the shared AP, wherein the frame comprises a common block, comprising one or more parameters for the shared AP, one or more station information blocks, wherein each station information block includes one or more parameters of the respective station associated with the sharing AP, and a shared AP information block for the shared AP comprising information about a number of the one or more further spatial streams.