Non-Orthogonal eMBB-URLLC Radio Access for Cloud Radio Access Networks with Analog Fronthauling
Open Access
- 2 September 2018
- Vol. 20 (9), 661
- https://doi.org/10.3390/e20090661
Abstract
This paper considers the coexistence of Ultra Reliable Low Latency Communications (URLLC) and enhanced Mobile BroadBand (eMBB) services in the uplink of Cloud Radio Access Network (C-RAN) architecture based on the relaying of radio signals over analog fronthaul links. While Orthogonal Multiple Access (OMA) to the radio resources enables the isolation and the separate design of different 5G services, Non-Orthogonal Multiple Access (NOMA) can enhance the system performance by sharing wireless and fronthaul resources. This paper provides an information-theoretic perspective in the performance of URLLC and eMBB traffic under both OMA and NOMA. The analysis focuses on standard cellular models with additive Gaussian noise links and a finite inter-cell interference span, 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 analog fronthauling C-RAN architecture, NOMA achieves higher eMBB rates with respect to OMA, while guaranteeing reliable low-rate URLLC communication with minimal access latency. Moreover, NOMA under SIC is seen to achieve the best performance, while, unlike the case with digital capacity-constrained fronthaul links, TIN always outperforms puncturing.Keywords
Funding Information
- H2020 European Research Council (725731)
This publication has 24 references indexed in Scilit:
- 5G transport networks: the need for new technologies and standardsIEEE Communications Magazine, 2016
- Toward Massive, Ultrareliable, and Low-Latency Wireless Communication With Short PacketsProceedings of the IEEE, 2016
- Connecting the DotsCirculation, 2016
- Ordered Tomlinson-Harashima Precoding in G.fast DownstreamPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2015
- Fronthaul and backhaul requirements of flexibly centralized radio access networksIEEE Wireless Communications, 2015
- Non-orthogonal multiple access for 5G: solutions, challenges, opportunities, and future research trendsIEEE Communications Magazine, 2015
- Five disruptive technology directions for 5GIEEE Communications Magazine, 2014
- Millimeter Wave Mobile Communications for 5G Cellular: It Will Work!IEEE Access, 2013
- Cooperative Wireless Cellular Systems: An Information-Theoretic ViewFoundations and Trends® in Communications and Information Theory, 2011
- On information rates for mismatched decodersIEEE Transactions on Information Theory, 1994