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This paper considers the coexistence of Ultra Reliable Low LatencyCommunications (URLLC) and enhanced Mobile BroadBand (eMBB) services in theuplink of Cloud Radio Access Network (C-RAN) architecture based on the relayingof radio signals over analog fronthaul links. While Orthogonal Multiple Access(OMA) to the radio resources enables the isolation and the separate design ofdifferent 5G services, Non-Orthogonal Multiple Access (NOMA) can enhance thesystem performance by sharing wireless and fronthaul resources. This paperprovides an information-theoretic perspective in the performance of URLLC andeMBB traffic under both OMA and NOMA. The analysis focuses on standard cellularmodels with additive Gaussian noise links and a finite inter-cell interferencespan, and it accounts for different decoding strategies such as puncturing,Treating Interference as Noise (TIN) and Successive Interference Cancellation(SIC). Numerical results demonstrate that, for the considered analogfronthauling C-RAN architecture, NOMA achieves higher eMBB rates with respectto OMA, while guaranteeing reliable low-rate URLLC communication with minimalaccess latency. Moreover, NOMA under SIC is seen to achieve the bestperformance, while, unlike the case with digital capacity-constrained fronthaullinks, TIN always outperforms puncturing.

Non-Orthogonal eMBB-URLLC Radio Access for Cloud Radio Access Networks with Analog Fronthauling