The present disclosure relates to a method for allocating Time Transmission Intervals, TTI, during Up Link, UL, transmissions in a shared radio cell environment. The present disclosure also relates to a network node for performing said allocation method. The allocation is performed by determining for each network node (10; 20A; 20B; 20C) in the shared radio cell environment which UEs (30) it serves and listens to. The TTIs are the allocated such that the UE transmission for UEs related to a network node (10; 20A; 20B; 20C) is coordinated by scheduling said UE transmission in the same TTI frame for a serving network node (10; 20A; 20B; 20C) and for one or more of listening network nodes (10; 20A; 20B; 20C) in the shared radio cell environment.
