journal article·2022-01-01Open access

Open RAN—Radio Access Network Evolution, Benefits and Market Trends

Dariusz Wypiór, Mirosław Klinkowski, Igor Michalski

Applied Sciences· Volume 12· Issue 1

Abstract

Open RAN (radio access network) movement is perceived as a game changer, having robust potential to introduce shifts in mobile radio access networks towards tailor-made solutions based on the architecture decomposition. It is widely assumed that those changes will affect the approach to network deployments and supply chains of network elements and their further integration and maintenance. First deployments of O-RAN-based networks have already delivered broadband services to end users. In parallel, many proof-of-concept feature evaluations and theoretical studies are being conducted by academia and the industry. In this review, the authors describe the RAN evolution towards open models and make an attempt to indicate potential open RAN benefits and market trends.
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Research context

OpenAlex topics: Advanced MIMO Systems Optimization · Advanced Wireless Communication Technologies · Millimeter-Wave Propagation and Modeling

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

National Institute of Telecommunications, 1 Szachowa Street, 04-894 Warsaw, Poland

Funding

National Science Centre, Poland · the Department of Electromagnetic Compatibility, National Institute of Telecommunications

References (77)

Show source-provided references
1. Advanced mobile phone service: Introduction, background, and objectives10.1002/j.1538-7305.1979.tb02208.x ↗
2. Advanced mobile phone service: The cellular concept10.1002/j.1538-7305.1979.tb02209.x ↗
3. ITU (2017). ITU-R Report M.2410-0 Minimum Requirements Related to Technical Performance for IMT-2020 Radio Interface(s), ITU.
4. ITU (2008). ITU-R Report M.2134 Requirements Related to Technical Performance for IMT-Advanced Radio Interface(s), ITU.
5. (2021, November 09). 3GPP TR 38.801 Study on New Radio Access Technology: Radio Access Architecture and Interfaces, R14. Available online: https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3056.
6. (2021, November 09). Ericsson Mobility Report, Sweden. Available online: https://www.ericsson.com/4a03c2/assets/local/mobility-report/documents/2021/june-2021-ericsson-mobility-report.pdf.
7. (2021, November 09). Mobile Radio Access Networks and 5G Evolution, Ericsson. Available online: https://www.ericsson.com/495922/assets/local/policy-makers-and-regulators/5-key-facts-about-5g-radio-access-networks.pdf.
8. (2021, November 09). Common Public Radio Interface, Specification Overview. Available online: http://www.cpri.info/spec.html.
9. Kukushkin, A. (2018). Introduction to Mobile Network Engineering GM, 3G-WCDMA. LTE and the Road to 5G, John Wiley & Sons Ltd.10.1002/9781119484196 ↗
10. (2021, November 09). Evolving to an Open C-RAN Architecture for 5G. Heavy Reading White Paper. Available online: https://www.fujitsu.com/us/imagesgig5/FNC-Fujitsu-Evolving-to-an-Open-C-RAN-Architecture-for-5G-White-Paper.pdf.
11. (2021, November 09). Small Cell Forum Identifies Virtualization Opportunity for Small Cells. Available online: https://www.smallcellforum.org/press-releases/small-cell-forum-identifies-virtualization-opportunity-small-cells.
12. (2021, November 09). 5G End-to-End Architecture Framework, NGMN Alliance. Available online: https://ngmn.org/wp-content/uploads/Publications/2019/190916-NGMN_E2EArchFramework_v3.0.8.pdf.
13. A survey of the functional splits proposed for 5G mobile crosshaul networks10.1109/COMST.2018.2868805 ↗
14. (2021, November 09). 3GPP TSG RAN Meeting #80 RP-180684—Revised SID on CU-DU Lower Layer Split for New Radio. Available online: https://www.3gpp.org/ftp/TSG_RAN/TSG_RAN/TSGR_80/Docs/RP-180684.zip.
15. (2021, November 09). 3GPP TS 38.401, Architecture Description. Available online: https://www.3gpp.org/ftp/Specs/archive/38_series/38.401/38401-g70.zip.
16. (2021, November 09). 3GPP TS 38.470 NG-RAN, F1 General Aspects and Principles. Available online: https://www.3gpp.org/ftp/Specs/archive/38_series/38.470/38470-g50.zip.
17. (2021, November 09). 3GPP TR 38.913 Study on Scenarios and Requirements for Next Generation Access Technologies v 16.0.0. Available online: https://www.3gpp.org/ftp//Specs/archive/38_series/38.913/38913-g00.zip.
18. Overview of O-RAN fronthaul specification
19. (2021, November 09). 3GPP TR 38.816 Study on Central Unit (CU)—Distributed Unit (DU) Lower Layer Split for NR. Available online: https://www.3gpp.org/ftp//Specs/archive/38_series/38.816/38816-f00.zip.
20. Modulation compression in next generation RAN: Air interface and fronthaul trade-offs10.1109/MCOM.001.2000453 ↗
21. Mukherjee, U. (2021, January 13–15). RAN Disaggregation: Where are we heading. Proceedings of the IEEE 5G World Forum, Montreal, QC, Canada. virtual event.
22. Minimum delay function placement and resource allocation for Open RAN (O-RAN) 5G networks10.1016/j.comnet.2021.107809 ↗
23. Open, programmable, and virtualized 5G networks: State-of-the-Art and the road ahead10.1016/j.comnet.2020.107516 ↗
24. Gavrilovska, L., Rakovic, V., and Denkovski, D. (2020). From Cloud RAN to Open RAN. Wireless Personal Communications, Springer Science+Business Media.10.1007/s11277-020-07231-3 ↗
25. (2021, November 09). Transition towards Open and Interoperable Network, 5G Americas White Paper. Available online: https://www.5gamericas.org/transition-toward-open-interoperable-networks.
26. Albrycht, I. (2021, November 09). 5G Made by America, Brief Programowy. Available online: https://ik.org.pl/wp-content/uploads/ik_brief_programowy_5g_madebyamerica_v4.pdf.
27. O-RAN Alliance (2021, November 09). Available online: https://www.o-ran.org/about.
28. O-RAN Alliance (2021, October 14). Open & Intelligent Software for the Radio Access Networks. Available online: https://www.o-ran.org/software.
29. Kafka, H. (2021, November 09). O-RAN Sofware Community—Bringing 3GPP and Linux Foundation Together. Available online: https://o-ran-sc.org/wp-content/uploads/sites/122/2020/12/ORAN_SC_presentation.pdf.
30. (2021, November 09). O-RAN Software Community. Available online: https://wiki.o-ran-sc.org/display/ORAN.
31. (2021, November 09). Telecom Inra Projects. Available online: https://telecominfraproject.com/.
32. (2021, November 09). Comments of the Telecom Infra Projects, Available online: https://www.ntia.doc.gov/files/ntia/publications/telecom_infra_project_02102021.pdf.
33. (2021, November 09). OpenRAN TIP. Available online: https://cdn.brandfolder.io/D8DI15S7/as/q60sew-6zd7ls-gd8ahv/TIP_Project_Group_Charter-OpenRAN.pdf.
34. (2021, November 09). Small Cells Forum. Available online: https://www.smallcellforum.org/what-we-do/.
35. (2021, November 09). ONF Announces New 5G SD-RAN™ Project. Available online: https://opennetworking.org/news-and-events/press-releases/onf-announces-new-5g-sd-ran-project/.
36. (2021, November 09). ONF and Deutsche Telekom Demonstrate Fully Disaggregated Open RAN with Open RIC Platform. Available online: https://opennetworking.org/news-and-events/press-releases/onf-and-deutsche-telekom-demonstrate-fully-disaggregated-open-ran-with-open-ric-platform/.
37. (2021, November 09). Open RAN Policy Coalition. Solutions to Expand the Global Advanced Wireless Supply Chain. Available online: https://www.openranpolicy.org/open-fan-policy-coalition-launches-to-advance-open-and-interoperable-solutions-to-expand-the-global-advanced-wireless-supply-chain/.
38. Ghadialy, Z. (2021, November 09). Introduction to O-RAN Timeline and Releases. Available online: https://www.parallelwireless.com/blog/introduction-to-o-ran-timeline-and-releases/.
39. (2021, November 09). xRAN Forum Merges with C-RAN Alliance to Form ORAN Alliance. Available online: https://www.businesswire.com/news/home/20180227005673/en/xRAN-Forum-Merges-C-RAN-Alliance-Form-ORAN.
40. (2021, November 09). O-RAN Specification. Available online: https://www.o-ran.org/specifications.
41. (2021, November 09). O-RAN: Towards an Open and Smart RAN. White Paper. Available online: https://static1.squarespace.com/static/5ad774cce74940d7115044b0/t/5bc79b371905f4197055e8c6/1539808057078/O-RAN+WP+FInal+181017.pdf.
42. O-RAN Alliance (2021, November 28). O-RAN Minimum Viable Plan and Acceleration towards Commercialization White Paper. Available online: https://static1.squarespace.com/static/5ad774cce74940d7115044b0/t/60f9b144abdc902712f43475/1626976585796/O-RAN+Minimum+Viable+Plan+and+Acceleration+towards+Commercialization+White+Paper+29+June+2021.pdf.
43. (2021, November 09). The Innovation Potential of Non Real-Time RAN Intelligent Controller. Available online: https://www.ericsson.com/en/blog/2020/10/innovation-potential-of-non-real-time-ran-intelligent-controller.
44. (2021, November 09). Nokia Open RAN, FCC Open RAN Showcase. Available online: https://www.openranpolicy.org/wp-content/uploads/2021/09/michael_murphy_-_nokia.pdf.
45. (2021, November 09). MoU on the Implementation of Open RAN Based Networks in Europe. Available online: https://www.politico.eu/wp-content/uploads/2021/01/20/POLITICO-Memorandum-of-Understanding-OPEN-RAN-big-four-operators-January-2021.pdf.
46. (2021, November 09). Open RAN Technical Priority Document under the Open RAN MoU. Available online: https://telecominfraproject.com/openran-mou-group/.
47. ITU (2018). ITU-T Technical Report GSTR-TN5G—Transport Network Support of IMT-2020/5G, ITU.
48. IEEE (2021, November 09). Next Generation Fronthaul Interface (1914) Working Group. Available online: https://sagroups.ieee.org/1914/.
49. (2018). IEEE Standard for Local and Metropolitan Area Networks—Time-Sensitive Networking for Fronthaul (Standard No. IEEE 802.1CM-2018).
50. Towards an efficient C-RAN optical fronthaul for the future networks: A tutorial on technologies, requirements, challenges, and solutions10.1109/COMST.2017.2773462 ↗
51. Passive optical networks for 5G transport: Technology and standards10.1109/JLT.2018.2856828 ↗
52. Imran, M.A., Zaidi, S.A.R., and Shakir, M.Z. (2017). Access, Fronthaul and Backhaul Networks for 5G & Beyond. IET, The Institution of Engineering and Technology.10.1049/PBTE074E ↗
53. (2021, November 09). Open RAN Technical Priorities—Executive Summary, The OpenRAN MOU. Available online: https://www.telefonica.com/documents/737979/146026852/Open-RAN-Technical-Priorities-Executive-Summary.pdf.
54. (2021, November 09). Open RAN Technical Priorities, The OpenRAN MOU. Available online: https://cdn.brandfolder.io/D8DI15S7/at/gf2qtrc9c3tptgxh5jjf/Open-RAN-Technical-Priority-Document-Final-Version-1.xlsx.
55. (2021, November 09). Open RAN: What Should Telcos Do? STL Partners Webinar. Available online: https://go.stlpartners.com/Open-Ran-Webinar-Presentation.
56. The road towards 6G: A comprehensive survey10.1109/OJCOMS.2021.3057679 ↗
57. (2021, November 09). Open RAN: Reality or Illusion, Microwave Journal. Available online: https://www.microwavejournal.com/articles/35108-open-ran-reality-or-illusion.
58. Anastasopoulos, M., Pelekanou, A., Manolopoulos, A., Tzanakaki, A., and Simeonidou, D. (2021, January 13–16). Optical Networks in Support of Open-RAN in 5G Systems and Beyond. Proceedings of the 2021 European Conference on Optical Communication (ECOC), Bordeaux, France.10.1109/ECOC52684.2021.9605967 ↗
59. Ayala-Romero, J.A., Garcia-Saavedra, A., Costa-Perez, X., and Iosifidis, G. (2021, January 10–13). Demonstrating a Bayesian Online Learning for Energy-Aware Resource Orchestration in vRANs. Proceedings of the IEEE INFOCOM 2021—IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS), Vancouver, BC, Canada.10.1109/INFOCOMWKSHPS51825.2021.9484585 ↗
60. Cao, Y., Lien, S.-Y., Liang, Y.-C., and Chen, K.-C. (2021, January 14–23). Federated deep reinforcement learning for user access control in open radio access networks. Proceedings of the ICC 2021—IEEE International Conference on Communications, Montreal, QC, Canada.10.1109/ICC42927.2021.9500603 ↗
61. Pamuklu, T., Erol-Kantarci, M., and Ersoy, C. (2021, January 14–23). Reinforcement Learning Based Dynamic Function Splitting in Disaggregated Green Open RANs. Proceedings of the ICC 2021—IEEE International Conference on Communications, Montreal, QC, Canada.10.1109/ICC42927.2021.9500721 ↗
62. Lee, H., Cha, J., Kwon, D., Jeong, M., and Park, I. (2020, January 7–11). Hosting AI/ML Workflows on O-RAN RIC Platform. Proceedings of the 2020 IEEE Globecom Workshops (GC Wkshps), Taipei, Taiwan.10.1109/GCWkshps50303.2020.9367572 ↗
63. Kuklinski, S., Tomaszewski, L., and Kolakowski, R. (2020, January 7–11). On O-RAN, MEC, SON and Network Slicing integration. Proceedings of the 2020 IEEE Globecom Workshops (GC Wkshps), Taipei, Taiwan.10.1109/GCWkshps50303.2020.9367527 ↗
64. A perspective of O-RAN integration with MEC, SON, and network slicing in the 5G era10.1109/MNET.2020.9277891 ↗
65. Kumar, H., Sapru, V., and Jaisawal, S.K. (2020, January 7–11). O-RAN based proactive ANR optimization. Proceedings of the 2020 IEEE Globecom Workshops (GC Wkshps), Taipei, Taiwan.10.1109/GCWkshps50303.2020.9367582 ↗
66. Reus-Muns, G., Jaisinghani, D., Sankhe, K., and Chowdhury, K.R. (2020, January 7–11). Trust in 5G Open RANs through Machine Learning: RF Fingerprinting on the POWDER PAWR Platform. Proceedings of the GLOBECOM 2020—2020 IEEE Global Communications Conference, Taipei, Taiwan.10.1109/GLOBECOM42002.2020.9348261 ↗
67. Lee, J.S., Park, J., Choi, J., and Lee, M.-S. (2020, January 21–23). Design of a Management Plane for 5G Open Fronthaul Interface. Proceedings of the 2020 International Conference on Information and Communication Technology Convergence (ICTC), Jeju, Korea.10.1109/ICTC49870.2020.9289612 ↗
68. Wang, T.-H., Chen, Y.-C., Huang, S.-J., Hsu, K.-S., and Hu, C.-H. (2021, January 8–10). Design of a Network Management System for 5G Open RAN. Proceedings of the 2021 22nd Asia-Pacific Network Operations and Management Symposium (APNOMS), Tainan, Taiwan.10.23919/APNOMS52696.2021.9562627 ↗
69. Garcia-Saavedra, A., and Costa-Perez, X. (IEEE Communications Standards Magazine, 2021). O-RAN: Disrupting the virtualized RAN ecosystem, IEEE Communications Standards Magazine.10.1109/MCOMSTD.101.2000014 ↗
70. Orhan, O., Swamy, V., Tetzlaff, T., Nassar, M., Nikopour, H., and Talwar, S. (2021). Connection management xAPP for O-RAN RIC: A graph neural network and reinforcement learning approach. arXiv.10.1109/ICMLA52953.2021.00154 ↗
71. Data-Driven network slicing from core to RAN for 5G broadcasting services10.1109/TBC.2020.3031742 ↗
72. Tamim, I., Saci, A., Jammal, M., and Shami, A. (2021). Downtime-Aware O-RAN VNF deployment strategy for optimized self-healing in the O-Cloud. arXiv.10.1109/GLOBECOM46510.2021.9685775 ↗
73. (2021, November 28). Open RAN Forecast Revised Upward, According to Dell’Oro Group. Available online: https://www.delloro.com/news/open-ran-forecast-revised-upward/.
74. (2021, November 28). Open RAN: Major New Research Report. Available online: https://appledoreresearch.com/2020/12/14/open-ran-market-research-report/.
75. (2021, November 28). Open RAN Capex to Reach $40.7 Billion in 2026: Report. Available online: https://telecom.economictimes.indiatimes.com/news/open-ran-capex-to-reach-40-7-billion-in-2026-report/78632329.
76. (2021, November 28). O-RAN Market Segmentation by Component. Available online: https://www.researchnester.com/reports/open-radio-access-network-market/2781.
77. O-RAN Alliance (2021, November 28). O-RAN Use Cases and Deployment Scenarios White Paper. Available online: https://static1.squarespace.com/static/5ad774cce74940d7115044b0/t/5e95a0a306c6ab2d1cbca4d3/1586864301196/O-RAN+Use+Cases+and+Deployment+Scenarios+Whitepaper+February+2020.pdf.