Embodiments may comprise logic to determine whether a value of a network allocation vector indicates that the apparatus is blocked from transmitting on the medium; logic to transmit a first clear to send packet at a first power level in response to determining that the apparatus is not blocked from transmitting on the medium, the first clear to send packet comprising a flag or bit to indicate the Shading Transmission Starts (STS); logic to receive a second clear to send packet after transmitting the first clear to send packet; and logic to transmit a first data transmission at a second power level after receiving the second clear to send packet, the second power level being less than the first power level.