On performance analysis of multioperator RAN sharing for mobile network operators

Enhancing the coverage and eliminating the poor performance is key to balance end-user experience and future network investments for mobile network operators (MNOs). Although vast amounts of infrastructure investments are provided by MNOs, there are still coverage and capacity planning problems at remote locations. This is because, in most cases, the population density and return-of-investments are low in those areas. In this paper, radio access network (RAN) sharing paradigm is utilized on experimental sites in Turkey to accommodate user equipment of multiple network operators under the same cell sites. We first investigate characteristics, benefits, and limitations of two different RAN sharing deployment scenarios. Then, a city-wide experimental RAN sharing study is conducted on live long-term evolution (LTE) networks between two MNOs in Turkey. Through experimental tests, we show overall performance gains of enabling RAN sharing feature in terms of observing various key performance indicators that are obtained from shared base stations. Our experimental results demonstrate that both downlink and uplink average user throughput values increased by 17.8% and 42.85%, respectively. After RAN sharing was enabled between MNOs, increase in the number of user equipment due to higher 4G coverage yielded a higher number of interradio access technology (inter-RAT) handover attempts. This caused inter-RAT handover out success rate to decrease by 70.66%. Intrafrequency handover out success rate, which indicates if the subscriber is using the same RAT type, increased by 358.33% and service drop rates dropped by 86.1%, respectively, after RAN sharing was enabled. Finally, we discuss and summarize the main takeaways of the outcome of the considered large-scale RAN sharing experiments

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[1] 3GPP. Network Sharing; Architecture and functional description (Release 15)), TS 23.251 V15.1.0. Technical Specification Group Services and System Aspects, 2018.
[2] 3GPP. Intra-domain connection of Radio Access Network (RAN) nodes to multiple Core Network (CN) nodes (Release 15), TS 23.236 V15.0.0. Technical Specification Group Services and System Aspects, 2018.
[3] Chien HT, Lin Y, Chang H, Lai C. Multi-operator fairness in Transparent RAN Sharing by Soft-Partition with Blocking and Dropping Mechanism. IEEE Transactions on Vehicular Technology 2018; 67(12): 11597-11605. doi: 10.1109/TVT.2018.2872042
[4] Lin Y, Chien H, Chang H, Lai C. Multi-operator fairness in transparent RAN Sharing. In: Proceedings of IEEE International Conference on Computing, Networking and Communications (ICNC); Maui, HI; 2018. pp. 259-263.
[5] Lin Y, Chien H, Chang H, Lai C, Lin K. Transparent RAN sharing of 5G Small Cells and Macrocells. IEEE Wireless Communications 2017; 24(6): 104-111. doi: 10.1109/MWC.2017.1600372
[6] Tran TX, Pompili D. Dynamic Radio Cooperation for User-Centric Cloud-RAN With Computing Resource Sharing. IEEE Transactions on Wireless Communications 2017; 16(4): 2379-2393. doi: 10.1109/TWC.2017.2664823
[7] Narmanlioglu O, Zeydan E. New era in shared C-RAN and core network: A case study for eﬀicient RRH usage. In: Proceedings of the IEEE International Conference on Communications (ICC); Paris, France; 2017. pp. 1-7.
[8] Narmanlioglu O, Zeydan E. New Era in shared cellular networks: Moving into open and virtualized platform. International Journal of Network Management 2017; 27(6): 1-19. doi: 10.1002/nem.1986
[9] Narmanlioglu O, Zeydan E, and Arslan SS. Service-aware multi-resource allocation in software-defined next gener- ation cellular networks. IEEE Access 2018; (6)1: 20348-20363. doi: 10.1109/ACCESS.2018.2818751
[10] Khan SN, Goratti L, Riggio R, Hasan S. On active, fine-grained RAN and spectrum sharing in multi-tenant 5G networks. In: Proceedings of IEEE 28th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC); Montreal, Canada; 2017. pp. 1-5.
[11] Park S, Simeone O, Shamai S. Multi-Tenant C-RAN with spectrum pooling: Downlink Optimization under Privacy Constraints. IEEE Transactions on Vehicular Technology 2018; 67(11):10492-10503. doi: 10.1109/TVT.2018.2865599
[12] Samdanis K, Costa-Perez X, Sciancalepore V. From network sharing to multi-tenancy: The 5G network slice broker. IEEE Communications Magazine 2016; 54(7): 32-39. doi: 10.1109/MCOM.2016.7514161
[13] Marotta MA, Kaminski N, Gomez-Miguelez I, Granville LZ, Rochol J et al. Resource sharing in heterogeneous cloud radio access networks. IEEE Wireless Communications 2015; 22(3): 74-82. doi: 10.1109/MWC.2015.7143329
[14] Yu R, Ding J, Huang X, Zhou M, Gjessing S et al. Optimal resource sharing in 5G-Enabled Vehicular Net- works: A Matrix Game Approach. IEEE Transactions on Vehicular Technology 2016; 65(10): 7844-7856. doi: 10.1109/TVT.2016.2536441
[15] Timus B, Kallin H, Mildh G. Full and partial resource access in RAN sharing. US9596698B2, US Patent, 2014. [16] Morper H, Markwart C. Multiplexing core networks in RAN sharing. US9615318B2, US Patent, 2014.
[17] Byun D, Xu J. Method and device for base station supporting RAN sharing. US20180288815A1, US Patent, 2018
[18] Liang C, Yu FR, Zhang, X. Toward Information-centric network function virtualization over 5g mobile wireless networks. IEEE Network 2015; 29(3): 68-74. doi: 10.1109/MNET.2015.7113228
[19] Ksentini A, Nikaein N. Toward enforcing Network Slicing on RAN: Flexibility and Resources Abstraction. IEEE Communications Magazine 2017; 55(6): 102-108. doi: 10.1109/MCOM.2017.1601119
[20] Afolabi I, Taleb T, Samdanis K, Ksentini A, Flinc H. Toward network slicing and softwarization: A survey on Principles, Enabling Technologies, and Solutions. IEEE Communications Surveys & Tutorials 2018; 20(3):2429- 2453. doi: 10.1109/COMST.2018.2815638
[21] Foukas X, Nikaein N, Kassem MM, Marina MK, Kontovasilis K. FlexRAN: A Flexible and Programmable Platform for Software-Defined Radio Access Networks. In: Proceedings of the 12th International on Conference on emerging Networking Experiments and Technologies (CoNEXT ’16). Association for Computing Machinery; New York, NY; 2016, USA. pp. 427-441.
[22] Guo T, Arnott R. Active LTE RAN sharing with partial resource reservation. In: Proceedings of IEEE 78th Vehicular Technology Conference (VTC Fall); Vegas, NV; 2013. pp. 1-5.
[23] Ahmad I, Wan C, Chang K. LTE-railway user priority-based cooperative resource allocation schemes for coexisting public safety and railway networks. IEEE Access 2017; 2017(5):7985-8000. doi: 10.1109/ACCESS.2017.2698098
[24] Kim H, Kim Y, Park P, Ahn S, Jo J et al. Network coverage expansion in radio access network sharing. In: Proceedings of Sixth International Conference on Future Generation Communication Technologies (FGCT); Dublin, Ireland; 2017. pp. 1-5.
[25] Khan SN, Goratti L, Riggio R. On active, fine-grained RAN and spectrum sharing in multi-tenant 5G networks. In: Proceedings of the IEEE 28th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC); Montreal, QC, Canada; 2017. pp. 1-5.
[26] 3GPP TS 29.573 V16.1.0.5G System; Public Land Mobile Network (PLMN) Interconnection, Stage 3 (Release 16), 2019.
[27] Turk Y, Zeydan E, Mercimek IF, Danisman E. HUBBLE: An Optical Link Management System for Dense Wave- length Division Multiplexing Networks. Turkish Journal Electrical Engineering & Computer Sciences 2019; (2020)28: 743-756. doi: 10.3906/elk-1904-207
[28] Turk Y, Zeydan E, Mercimek IF, Danisman E. Unified and automated fault management platform for optical networks. In: Proceedings of the Network Traﬀic Measurement and Analysis Conference (TMA); Paris, France; 2019. pp. 197-198.