A method implemented in a network node, the method comprising: performing energy detection on assigned resources corresponding to a configured uplink grant for a wireless device, WD, wherein performing the energy detection on the assigned resources corresponding to the configured uplink grant further comprises one of: performing a demodulation reference signal, DMRS, sequence detection on the assigned resources corresponding to the configured uplink grant, the DMRS sequence detection assuming that the wireless device has transmitted a transport block on a physical uplink shared channel and an associated DMRS according to the configured uplink grant; and performing the energy detection on the assigned resources corresponding to the configured uplink grant on a physical uplink shared channel on which a transport block is transmitted by the wireless device, based on a radio frequency signal detected on the assigned resources corresponding to the configured uplink grant; and based on a level of the detected energy, one of: when the level of the detected energy is less than a threshold, sending an energy detection indication corresponding to the assigned resources associated with the configured uplink grant, wherein as a result of sending the energy detection indication before a timer started when the transport block is sent on the physical uplink shared channel expires, receiving a retransmission of the transport block from the WD; and when the level of the detected energy is at least equal to the threshold, demodulating and decoding the transport block associated with the configured uplink grant, wherein the threshold is set considering the specific configuration of the WD, which configuration comprises one or more out of: DMRS configuration, antenna port configuration, PUSCH power control configuration of the WD. performing a demodulation reference signal, DMRS, sequence detection on the assigned resources corresponding to the configured uplink grant, the DMRS sequence detection assuming that the wireless device has transmitted a transport block on a physical uplink shared channel and an associated DMRS according to the configured uplink grant; and performing the energy detection on the assigned resources corresponding to the configured uplink grant on a physical uplink shared channel on which a transport block is transmitted by the wireless device, based on a radio frequency signal detected on the assigned resources corresponding to the configured uplink grant; and based on a level of the detected energy, one of: when the level of the detected energy is less than a threshold, sending an energy detection indication corresponding to the assigned resources associated with the configured uplink grant, wherein as a result of sending the energy detection indication before a timer started when the transport block is sent on the physical uplink shared channel expires, receiving a retransmission of the transport block from the WD; and when the level of the detected energy is at least equal to the threshold, demodulating and decoding the transport block associated with the configured uplink grant, wherein the threshold is set considering the specific configuration of the WD, which configuration comprises one or more out of: DMRS configuration, antenna port configuration, PUSCH power control configuration of the WD. when the level of the detected energy is less than a threshold, sending an energy detection indication corresponding to the assigned resources associated with the configured uplink grant, wherein as a result of sending the energy detection indication before a timer started when the transport block is sent on the physical uplink shared channel expires, receiving a retransmission of the transport block from the WD; and when the level of the detected energy is at least equal to the threshold, demodulating and decoding the transport block associated with the configured uplink grant, wherein the threshold is set considering the specific configuration of the WD, which configuration comprises one or more out of: DMRS configuration, antenna port configuration, PUSCH power control configuration of the WD.