Control Plane Functions for 5G: Spectrum Sharing and Mobility Frameworks

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School of Electrical Engineering | Doctoral thesis (article-based) | Defence date: 2019-06-20
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Authors

Date

2019

Department

Tietoliikenne- ja tietoverkkotekniikan laitos
Department of Communications and Networking

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Mcode

Degree programme

Language

en

Pages

86 + app. 78

Series

Aalto University publication series DOCTORAL DISSERTATIONS, 111/2019

Abstract

Unlike the previous generations, the design of the 5th Generation of cellular mobile communications (5G) is driven by a large number of diverse use cases, which are often classified into three types: enhanced Mobile Broadband (eMBB), Ultra Reliable and Low Latency Communication (URLLC) and massive Machine Type Communication (mMTC). These diverse use cases brought a new set of problems such as ultra-low latency, ultra-high reliability and extremely long battery life requirements, in addition to the traditional but exponentially growing throughput requirement. As such, the control plane design plays a key role in 5G to efficiently integrate and use all concepts that address diverse use cases and even directly addressing the requirements of some of the use cases. In this thesis, we studied control plane functions for inter-operator spectrum sharing and mobility. The spectrum sharing framework includes a coordination protocol for co-primary spectrum sharing. We have shown that this can be implemented using a non-cooperative game model that requires minimal information exchange and equal favour exchanged with instantaneous reciprocity among the operators. The game is shown to have Nash equilibrium, that can be reached by playing sequential games with myopic best response strategies. Two cooperative game models are also studied for co-primary spectrum sharing. These games can be used as an upper bound for performance analysis of the non-cooperative game. Simulation results show that the performance of the non-cooperative game outperforms default spectrum usage partitions for mutual renting and resource pooling and achieves close to optimal performance in some scenarios. The mobility framework discusses a state machine with novel RRC Connected Inactive state. In contrast to the spectrum sharing framework, the mobility framework mainly addresses User Equipments (UEs) who do not have high data activity. As such, the design is driven by the objective of minimizing UE power consumption, at the same time reducing the number of messages and latency, which has an impact on the network. The characteristics of RRC Connected Inactive and the procedures required in this state are designed to this end. Simulation results show that it has significantly better performance than LTE in terms of signalling overhead, UE power consumption and control plane latency.

Description

Supervising professor

Tirkkonen, Olav, Prof., Aalto University, Department of Communications and Networking, Finland

Thesis advisor

Säily, Mikko, Nokia Bell Labs, Finland
Dowhuszko, Alexis, Dr., Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Spain

Keywords

control plane, co-primary sepctrum sharing, radio resource control (RRC)

Other note

Parts

  • [Publication 1]: S. Hailu, A. Dowhuszko, O. Tirkkonen. Adaptive Co-primary Shared Access Between Co-located Radio Access Networks. In Internat. Conf. on Cognitive Radio Oriented Wireless Networks (CrownCom), pp. 131-135, June 2014.
    DOI: 10.4108/icst.crowncom.2014.255381 View at publisher
  • [Publication 2]: S. Hailu, A. Dowhuszko, O. Tirkkonen, L. Wei. One-Shot Games for Spectrum Sharing among Co-Located Radio Access Networks. IEEE Internat. Conf. on Communication Systems, pp. 61-66, November 2014.
    DOI: 10.1109/ICCS.2014.7024766 View at publisher
  • [Publication 3]: B. Singh, S. Hailu, K. Koufos, A.A. Dowhuszko, O. Tirkkonen, R. Jäntti, R. Berry. Coordination protocol for inter-operator spectrum sharing in co-primary 5G small cell networks. In IEEE CommunicationsMagazine, 2015, vol. 53, no. 7, pp. 34-40.
    DOI: 10.1109/MCOM.2015.7158263 View at publisher
  • [Publication 4]: S. Hailu, R. Freij-Hollanti, A.A. Dowhuszko, O. Tirkkonen. Network resource sharing games with instantaneous reciprocity. Submitted to IEEE Trans. On Mobile Computing, September 2018.
  • [Publication 5]: I.L. Da Silva, G. Mildh, M. Säily, S. Hailu. A novel state model for 5G Radio Access Networks. IEEE International Conference on Communications Workshops (ICC), pp. 632-637, 2016.
    DOI: 10.1109/ICCW.2016.7503858 View at publisher
  • [Publication 6]: S. Hailu, M. Säily, O. Tirkkonen. Towards a configurable state model for 5G radio access networks. In River Publishers Proceedings of Global Wireless Submit 2016 (GWS-2016), pp. 123-127.
  • [Publication 7]: S. Hailu, M. Säily. Hybrid paging and location tracking scheme for inactive 5G UEs. European Conference on Networks and Communications (EuCNC), pp. 1-6, 2017.
    DOI: 10.1109/EuCNC.2017.7980730 View at publisher
  • [Publication 8]: S. Hailu, M. Säily, O. Tirkkonen. RRC state handling for 5G. IEEE Communications Magazine, 2019, vol. 57 no. 1, pp. 106 – 113.
    Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-201901301423
    DOI: 10.1109/MCOM.2018.1700957 View at publisher

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https://urn.fi/URN:ISBN:978-952-60-8597-5

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[diss] Sähkötekniikan korkeakoulu / ELEC