A method of controlling wireless transmissions in a wireless communication system, the method comprising: an access point (10; 1000; 1100) of the wireless communication system configuring a carrier for communication with one or more wireless devices associated with the access point (10; 1000; 1100); the access point (10; 1000; 1100) contending at least with one or more other access points (10; 1000; 1100) for access to the carrier to transmit data to at least one of the wireless devices associated with the access point (10; 1000; 1100); the access point (10; 1000; 1100) cooperating with the one or more other access points (10; 1000; 1100) by sharing a transmission opportunity, TXOP, reserved on the carrier by one of the access points (10; 1000; 1100) in response to gaining access to the carrier, wherein said sharing of the TXOP is based on an invitation to participate in the sharing of the TXOP, the invitation being transmitted by the access point (10; 1000; 1100) that gained access to the carrier to reserve the TXOP and to offer sharing of the TXOP; before transmitting data in the shared TXOP, the access point (10; 1000; 1100) performing a Ready-to-Send/Clear-to-Send, RTS/CTS, procedure; and the access point (10; 1000; 1100) coordinating the RTS/CTS procedure with an RTS/CTS procedure respectively performed by each of the one or more other access points (10; 1000; 1100) sharing the TXOP, wherein said coordinating the RTS/CTS procedures is based on control information transmitted from the access point (10; 1000; 1100) that reserved the TXOP to the one or more other access points (10; 1000; 1100) sharing the TXOP, at least a part the control information being transmitted in a message conveying the invitation to participate in the sharing of the TXOP. an access point (10; 1000; 1100) of the wireless communication system configuring a carrier for communication with one or more wireless devices associated with the access point (10; 1000; 1100); the access point (10; 1000; 1100) contending at least with one or more other access points (10; 1000; 1100) for access to the carrier to transmit data to at least one of the wireless devices associated with the access point (10; 1000; 1100); the access point (10; 1000; 1100) cooperating with the one or more other access points (10; 1000; 1100) by sharing a transmission opportunity, TXOP, reserved on the carrier by one of the access points (10; 1000; 1100) in response to gaining access to the carrier, wherein said sharing of the TXOP is based on an invitation to participate in the sharing of the TXOP, the invitation being transmitted by the access point (10; 1000; 1100) that gained access to the carrier to reserve the TXOP and to offer sharing of the TXOP; before transmitting data in the shared TXOP, the access point (10; 1000; 1100) performing a Ready-to-Send/Clear-to-Send, RTS/CTS, procedure; and the access point (10; 1000; 1100) coordinating the RTS/CTS procedure with an RTS/CTS procedure respectively performed by each of the one or more other access points (10; 1000; 1100) sharing the TXOP, wherein said coordinating the RTS/CTS procedures is based on control information transmitted from the access point (10; 1000; 1100) that reserved the TXOP to the one or more other access points (10; 1000; 1100) sharing the TXOP, at least a part the control information being transmitted in a message conveying the invitation to participate in the sharing of the TXOP.