First radio terminal, method to operate a first radio terminal, and method to operate a radio communications network

A first radio terminal (UE1) of a radio communications network (RCN), said first radio terminal (UE1) comprising:

• at least one processor, at least one memory comprising computer program code, at least one communication module, and at least one antenna, wherein the computer program code and the memory are configured, together with the at least one processor, the at least one communication module, and the at least one antenna, to cause the radio terminal (UE1) at least to
• determine (102) a SPS configuration for the first radio terminal (UE1), wherein the SPS configuration indicates a set (s1) of SPS, semi-persistently scheduled, radio resources (rr1-rr4) of a shared device-to-device radio channel (CH), wherein the indicated SPS radio resources (rr1-rr4) are intended for a transmission by the first radio terminal (UE1);
• transmit (104), towards at least one second radio terminal (UE2), data via a first subset (ss1) of the set (s1) of the SPS radio resources (rr1-rr4);
• select (106) at least one sensing resource (sr) out of the set (s1) of SPS radio resources (rr1-rr4);
• sense (108) the at least one sensing resource (sr);
• determine (110) a contention indicator (CONT) in dependence on the sensing (108) of the at least one sensing resource (sr);
• and
• refrain (114) from transmitting data via a second subset (ss2) of the set (s1) of SPS radio resources (rr1-rr4) if the contention indicator (CONT) indicates a contention situation at the at least one sensing resource (sr).