Resource Allocation for 5G Systems

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School of Electrical Engineering | Doctoral thesis (article-based) | Defence date: 2021-12-14
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Authors

Date

2021

Department

Tietoliikenne- ja tietoverkkotekniikan laitos
Department of Communications and Networking

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Mcode

Degree programme

Language

en

Pages

80 + app. 62

Series

Aalto University publication series DOCTORAL DISSERTATIONS, 169/2021

Abstract

The 5th generation of cellular communications is driven by three broadly classified use cases, enhanced mobile broadband, massive machine type communication, and ultra-reliable low latency communication. These new use cases bring a new set of problems such as provisioning of extremely high user rates, ultra-high reliability, ultra-low latency, extremely low jitter, and extremely long battery life, to name a few. Therefore, in this thesis, we focus on lower protocol layers of radio access networks, designing technology components enabling communication confirming new extreme requirements introduced by 5th generation systems. To increase the amount of spectrum available for an operator in a specific geographic region, we discuss inter-operator spectrum sharing. The operators employ non-cooperative game-theoretic mechanisms to enable sharing without revealing their RAN-related information, e.g., optimization targets and traffic load to each other. The operators are independent and motivated by self-interest. However, if the sharing persists over a long time, non-cooperative operators may develop a degree of cooperation to maximize their self-interest by employing repeated games. Rational operators tend to cooperate due to fear of repercussions if they focus on optimizing long-term instead of short-term gains. Such cooperation emerges from individuals' greedy decisions. Simulation results show that the spectrum sharing based on repeated games provides better network utility than default spectrum allocations in the scenarios like limited spectrum pool or mutual renting. In contrast to spectrum allocation, which focuses on the rate improvement for most users in a mobile broadband scenario, the other half of the thesis pivots to providing extremely reliable service, which induces the need to concentrate on the extremely deficient users in a service area. To improve critical communication, we consider allocation designs that boost rate availability and reliability. The availability targets a specific rate that a cell can provide at probable locations. We inspect multi-hop mechanisms for extreme availability, focusing on time scheduling weights, power allocation, and precoding weights. Inter-cell interference can limit availability at the cell edge, and thus we consider coordination among cells in limiting the interference. Furthermore, we consider allocation designs for minimum rate improvement using transmission repetitions for low latency contention-based access services. Simulation results show that the employed techniques significantly improve 5G ultra-reliable, low latency services.

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Supervising professor

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

Thesis advisor

Koufus, Konstantinos, Dr., University of Bristol, UK
Li, Zexian, Dr., Nokia Bell Labs, Finland

Keywords

5G, spectrum sharing, ultra-reliable low latency communication

Other note

Parts

  • [Publication 1]: B. Singh, K. Koufos, O. Tirkkonen and R. Berry. Co-primary inter-operator spectrum sharing over a limited spectrum pool using repeated games. In IEEE International Conference on Communications (ICC), pp. 1494-1495, June 2015.
    DOI: 10.1109/ICC.2015.7248535 View at publisher
  • [Publication 2]: B. Singh, K. Koufos, O. Tirkkonen and R. Jäntti. Repeated spectrum sharing games in multi-operator heterogeneous networks. In IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN), pp. 221-228, September 2015
  • [Publication 3]: B. Singh, S. Hailu, K. Koufos, A. A. Dowhuszko, O. Tirkkonen, R. Jäntti and R. Berry. Coordination protocol for inter-operator spectrum sharing in co- primary 5G small cell networks. In IEEE Communications Magazine, vol. 53, no. 7, pp. 34-40, July 2015.
    DOI: 10.1109/MCOM.2015.7158263 View at publisher
  • [Publication 4]: B. Singh, Z. Li, O. Tirkkonen, M. A. Uusitalo and P. Mogensen. Ultra-reliable communication in a factory environment for 5G wireless networks: Link level and deployment study. In IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) Workshop, pp. 1-5, September 2016.
    DOI: 10.1109/PIMRC.2016.7794586 View at publisher
  • [Publication 5]: B. Singh, O. Tirkkonen, Z. Li, M.A. Uusitalo and R. Wichman. Selective multi-hop relaying for ultra-reliable communication in a factory environment. In IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), pp. 1-6, September 2016.
    DOI: 10.1109/PIMRC.2016.7794882 View at publisher
  • [Publication 6]: B. Singh, O. Tirkkonen, Z. Li and M. A. Uusitalo. Interference coordination in ultra-reliable and low latency communication networks. In European Conference on Networks and Communications (EuCNC), pp. 251-255, June 2018.
    Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-201812106040
    DOI: 10.1109/EuCNC.2018.8443229 View at publisher
  • [Publication 7]: B. Singh, O. Tirkkonen, Z. Li and M. A. Uusitalo. Contention-Based Access for ultra-reliable low latency uplink transmissions. IEEE Wireless Communications Letters, vol. 7, no. 2, pp. 182-185, April 2018.
    Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-201806183322
    DOI: 10.1109/LWC.2017.2763594 View at publisher

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https://urn.fi/URN:ISBN:978-952-64-0615-2

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[diss] Sähkötekniikan korkeakoulu / ELEC