A probabilistic Grant Free scheduling model to allocate resources for eXtreme URLLC applications

Ultra-Reliable Low-Latency Communication (URLLC) in 5G demands 0. 5ms latency for end-to-end one-way transmission including a scheduling process within the tight latency budget. For this reason, a Grant-Free (GF) scheduling model has intuitively appealed to 5G research community. In 6G, this communication paradigm coined eXtreme ultra-reliable and low-latency communication (xURLLC) is expected to demand even tougher requirements, which seems to make the GF scheduling not optional but mandatory for 6G xURLLC.In this paper we propose a probabilistic GF scheduling model to allocate resource for URLLC applications. The nature of a GF scheduling model naturally resolves the latency issue raised in URLLC, and the reliability issue can be under control by tuning various parameters including radio resources we allocate.