Also note that terminology such as eNodeB and UE should be considering non-limiting and does in particular not imply a certain hierarchical relation between the two; in general “eNodeB” could be considered as device 1 and “UE” device 2, and these two devices communicate with each other over some radio channel. Herein, we also focus on wireless transmissions in the downlink, but the embodiments herein are equally applicable in the uplink for equivalent functions. For example, for the uplink, the first communication device 101 may send a newly-designed PUCCH together with a DeModulation Reference Signal (DMRS) or a Sounding Reference Signal (SRS), where the PUCCH may carry some information about its upcoming contention-based PUSCH transmissions. In such UL scenarios, it may be noted that the UL RS may be referred to with a different name than as a discovery signal.