Wireless communications systems and methods related to considering channel variations for medium sharing in a spatial domain are provided. A first wireless communication device transmits one or more reservation response signals indicating spatial channel information in response to a reservation request for a transmission opportunity (TXOP) in a frequency spectrum. The first wireless communication device receives, from a second wireless communication device, a communication signal from a first spatial subspace during the TXOP based on the reservation request. In one embodiment, the first wireless communication device may repeat a transmission of the reservation response signal after transmitting a portion of the communication signal. In another embodiment, the first wireless communication device may include a channel variation parameter in the reservation response signal.