A method comprising: in a wireless communication device (102, 104, 106): configuring a receiver of said wireless communication device (102, 104, 106) to receive communications in a higher-sensitivity mode of operation; communicating with one of one or more other wireless communication devices (102, 104, 106) to schedule access to a medium shared by said wireless communication device (102, 104, 106) and said one or more other wireless communication devices (102, 104, 106) while in the higher-sensitivity mode of operation; after one or more medium access periods (108, 110, 112, 114) are scheduled for said wireless communication device (102, 104, 106), configuring said receiver of said wireless communication device (102, 104, 106) to receive communications in a lower-sensitivity mode of operation and transmitting data onto said medium upon receiving from one of one or more other wireless communication devices (102, 104, 106), during one of said one or more medium access periods (108, 110, 112, 114) scheduled for said wireless communication device (102, 104, 106), a medium reservation message designating said wireless communication device (102, 104, 106). in a wireless communication device (102, 104, 106): configuring a receiver of said wireless communication device (102, 104, 106) to receive communications in a higher-sensitivity mode of operation; communicating with one of one or more other wireless communication devices (102, 104, 106) to schedule access to a medium shared by said wireless communication device (102, 104, 106) and said one or more other wireless communication devices (102, 104, 106) while in the higher-sensitivity mode of operation; after one or more medium access periods (108, 110, 112, 114) are scheduled for said wireless communication device (102, 104, 106), configuring said receiver of said wireless communication device (102, 104, 106) to receive communications in a lower-sensitivity mode of operation and transmitting data onto said medium upon receiving from one of one or more other wireless communication devices (102, 104, 106), during one of said one or more medium access periods (108, 110, 112, 114) scheduled for said wireless communication device (102, 104, 106), a medium reservation message designating said wireless communication device (102, 104, 106). configuring a receiver of said wireless communication device (102, 104, 106) to receive communications in a higher-sensitivity mode of operation; communicating with one of one or more other wireless communication devices (102, 104, 106) to schedule access to a medium shared by said wireless communication device (102, 104, 106) and said one or more other wireless communication devices (102, 104, 106) while in the higher-sensitivity mode of operation; after one or more medium access periods (108, 110, 112, 114) are scheduled for said wireless communication device (102, 104, 106), configuring said receiver of said wireless communication device (102, 104, 106) to receive communications in a lower-sensitivity mode of operation and transmitting data onto said medium upon receiving from one of one or more other wireless communication devices (102, 104, 106), during one of said one or more medium access periods (108, 110, 112, 114) scheduled for said wireless communication device (102, 104, 106), a medium reservation message designating said wireless communication device (102, 104, 106).