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The advent of 5G NR (New Radio) technology has enabled a wide range of new use cases in commercial and tactical communications, particularly in the realm of Ultra-Reliable Low-Latency Communications (URLLC). In the conventional approach supported by the 3GPP standards, URLLC transmissions tend to preempt ongoing lower-priority transmissions (such as enhanced Mobile Broadband), degrading the Quality of Service (QoS) for the preempted transmissions. This paper proposes a novel frequency-domain spread spectrum underlay signal technique to address this challenge. The proposed approach enables the immediate transmission of URLLC traffic without preemption, increasing the network’s resiliency. This paper describes the design of the proposed underlay signaling for URLLC traffic, which is transmitted concurrently by the 5G base station (BS) with the non-URLLC traffic on the 5G PDSCH …