University of Oulu

S. K. Joshi, K. B. S. Manosha, M. Codreanu and M. Latva-aho, "Dynamic Inter-Operator Spectrum Sharing via Lyapunov Optimization," in IEEE Transactions on Wireless Communications, vol. 16, no. 10, pp. 6365-6381, Oct. 2017. doi: 10.1109/TWC.2017.2722999

Dynamic inter-operator spectrum sharing via Lyapunov optimization

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Author: Joshi, Satya Krishna1; Manosha, K. B. Shashika1; Codreanu, Marian1;
Organizations: 1Centre for Wireless Communications, University of Oulu, 90014 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.4 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2017
Publish Date: 2018-08-01


The problem of spectrum sharing between two operators in a dynamic network is considered. We allow both operators to share (a fraction of) their licensed spectrum band with each other by forming a common spectrum band. The objective is to maximize the gain in profits of both operators by sharing their licensed spectrum bands rather than using them exclusively, while considering the fairness among the operators. This is modeled as a two-person bargaining problem, and cast as a stochastic optimization. To solve this problem, we propose centralized and distributed dynamic control algorithms. At each time slot, the proposed algorithms perform the following tasks: 1) determine spectrum price for the operators; 2) make flow control decisions of users data; and 3) jointly allocate spectrum band to the operators and design transmit beamformers, which is known as resource allocation (RA). Since the RA problem is NP-hard, we have to rely on sequential convex programming to approximate its solution. To derive the distributed algorithm, we use alternating direction method of multipliers for solving the RA problem. Numerically, we show that the proposed distributed algorithm achieves almost the same performance as the centralized one. Furthermore, the results show that there is a trade-off between the achieved profits of the operators and the network congestion.

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Series: IEEE transactions on wireless communications
ISSN: 1536-1276
ISSN-E: 1558-2248
ISSN-L: 1536-1276
Volume: 16
Issue: 10
Pages: 6365 - 6381
DOI: 10.1109/TWC.2017.2722999
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This research was supported by the Finnish Funding Agency for Technology and Innovation (Tekes), Academy of Finland, Broadcom, Nokia, Huawei, Anite, Elektrobit, Nokia Foundation, and Tauno Tönning Foundation.
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