A method for use in a User equipment, UE, comprising: receiving a first signal indicating a request to transmit to the UE from a first transmitting UE; receiving one or more additional signals indicating that one or more additional transmitting UEs are requesting to transmit to corresponding target UEs; identifying, based on a received power of the first signal and the one or more additional signals, one or more incompatible UEs, the incompatible UEs comprising at least one of the one or more additional transmitting UEs; determining, based on a priority of, the first transmitting UE, the one or more additional transmitting UEs, and the corresponding target UEs, whether to block transmission by the incompatible UEs; and in response to the determination to block transmission of the one or more incompatible UEs, sending a signal indicating a block on transmission by the one or more incompatible UEs, wherein the signal indicating the block on transmission comprises a grant signal, sending the grant signal comprises transmitting a tone matrix comprising a plurality of tones corresponding to each of the first transmitting UE and the one or more additional transmitting UEs, the grant signal indicating the grant to the first transmitting UE comprises the tone matrix with power on a first tone corresponding to the first transmitting UE, the tone matrix comprises two tones for at least one of the one or more potentially incompatible UEs, the two tones comprise a grant tone and a deny tone for a corresponding UE, and the grant signal comprises power on a deny tone for the at least one of the one or more potentially incompatible UEs. receiving a first signal indicating a request to transmit to the UE from a first transmitting UE; receiving one or more additional signals indicating that one or more additional transmitting UEs are requesting to transmit to corresponding target UEs; identifying, based on a received power of the first signal and the one or more additional signals, one or more incompatible UEs, the incompatible UEs comprising at least one of the one or more additional transmitting UEs; determining, based on a priority of, the first transmitting UE, the one or more additional transmitting UEs, and the corresponding target UEs, whether to block transmission by the incompatible UEs; and in response to the determination to block transmission of the one or more incompatible UEs, sending a signal indicating a block on transmission by the one or more incompatible UEs, wherein the signal indicating the block on transmission comprises a grant signal, sending the grant signal comprises transmitting a tone matrix comprising a plurality of tones corresponding to each of the first transmitting UE and the one or more additional transmitting UEs, the grant signal indicating the grant to the first transmitting UE comprises the tone matrix with power on a first tone corresponding to the first transmitting UE, the tone matrix comprises two tones for at least one of the one or more potentially incompatible UEs, the two tones comprise a grant tone and a deny tone for a corresponding UE, and the grant signal comprises power on a deny tone for the at least one of the one or more potentially incompatible UEs.