A method to operate a first wireless network unit (A) is provided, wherein the method comprises: determining (102) a data entity (DE) intended to be transmitted via a physical shared radio channel (PSCH); determining (104) a plurality of segments of the determined data entity (DE); determining (106) at least one first radio resource window (rw(n−1)) of the physical shared radio channel (PSCH); monitoring (108) the at least one first radio resource window (rw(n−1)); determining (110) a plurality of candidate resources (rr12, rr22) in a second resource window (rw(n)) of the physical shared radio channel (PSCH) in dependence on monitored radio resources (rr11, rr21) of the at least one first radio resource window (rw(n−1)), wherein each candidate resource (rr12, rr22) of the plurality of candidate resources (rr12, rr22) is part of a resource chain (RC1, RC2) of the physical shared radio channel (PSCH); selecting (112) one of the plurality of candidate resources (rr12, rr22) as a transmission start resource (rr12); and transmitting (114, 116, 118) the plurality of the determined segments of the data entity (DE) via radio resources (rr12, rr13, rr14) along the resource chain (RC1) to which the selected transmission start resource (rr12) belongs to, wherein a single one of the segments is transmitted via a single one of the radio resources (rr12, rr13, rr14) of the resource chain (RC1).