Joint resource allocation over licensed and unlicensed spectrum in U-LTE networks
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Joint resource allocation over licensed and unlicensed spectrum in U-LTE networks Xiaojian Zhen1,2 • Hangguan Shan1,2
•
Guanding Yu1,2 • Yu Cheng3 • Lin X. Cai3
Accepted: 6 November 2020 Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract By sharing unlicensed spectrum with Wi-Fi networks, unlicensed LTE (U-LTE) is one of the promising approaches to further improve LTE network throughput. However, the problem of coexistence with Wi-Fi networks is one of the main challenges of U-LTE technology. In this work, we study joint resource allocation for LTE over the legacy licensed spectrum and the unlicensed spectrum to maximize the benefit of U-LTE in a multi-cell scenario. Specifically, we formulate a mixed-integer power-channel-time allocation problem aiming at maximizing the network throughput, with the constraints of protecting the coexisting Wi-Fi networks and satisfying hardware limitation on bandwidth occupancy of user equipments (UEs), while guaranteeing per UE’s throughput. To solve the resource allocation problem, we exploit the delay column generation approach to decompose the original optimization problem and then propose a novel algorithm based on Karush–Kuhn–Tucker conditions. Furthermore, we analyze the gap between the proposed algorithm and the optimal solution. Simulation results show the advantage of the proposed algorithm in terms of the network throughput and convergence speed. Keywords U-LTE network Resource allocation Optimization Delay column generation
1 Introduction The cellular data traffic has been increasing in the past few years due to the explosive growth in mobile applications, putting a lot of pressure on capacity improvement on licensed spectrum. It is forecast in [2] that the data traffic will be 77 exabytes/month by 2022. As a result, the academic and industry start to pay attention to the 5 GHz unlicensed spectrum where the competition of spectrum is not severe [3]. Unlicensed LTE (U-LTE), first proposed by
This work was presented in part at IEEE VTC 2017-Fall [1]. & Hangguan Shan [email protected] 1
College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
2
Zhejiang Provincial Key Laboratory of Information Processing and Communication Networks, Hangzhou 310027, China
3
Department of Electrical and Computer Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA
Qualcomm and Ericsson, is one of the effective approaches to relieve the problem of lack of licensed spectrum. However, the 5 GHz unlicensed band is mainly used by Wi-Fi networks. The coexistence between the Wi-Fi and LTE networks becomes one of the main challenges of U-LTE technology because they employ different access technologies and have evolved independently in the last decade. The authors in [4] survey solutions based on listenbefore-talk (LBT) and almost blank subframe (ABS), which are expected to guarantee harmonious coexistence between the Wi-Fi and LTE networks on unlice
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