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The newly introduced ultra-reliable low latency communication service classin 5G New Radio depends on innovative low latency radio resource managementsolutions that can guarantee high reliability. Grant-free random access, wherechannel resources are accessed without undergoing assignment through ahandshake process, is proposed in 5G New Radio as an important latency reducingsolution. However, this comes at an increased likelihood of collisionsresulting from uncontrolled channel access, when the same resources arepreallocated to a group of users. Novel reliability enhancement techniques aretherefore needed. This article provides an overview of grant-free random accessin 5G New Radio focusing on the ultra-reliable low latency communicationservice class, and presents two reliability-enhancing solutions. The firstproposes retransmissions over shared resources, whereas the second proposalincorporates grant-free transmission with non-orthogonal multiple access withoverlapping transmissions being resolved through the use of advanced receivers.Both proposed solutions result in significant performance gains, in terms ofreliability as well as resource efficiency. For example, the proposednon-orthogonal multiple access scheme can support a normalized load of morethan 1.5 users/slot at packet loss rates of ~10^{-5} - a significantimprovement over the maximum supported load with conventional grant-freeschemes like slotted-ALOHA.

Uplink Grant-Free Random Access Solutions for URLLC services in 5G New Radio