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Entropy 2018, 20(2), 88; https://doi.org/10.3390/e20020088

Traffic Offloading in Unlicensed Spectrum for 5G Cellular Network: A Two-Layer Game Approach

School of Electronics and Information Engineering, Beijing Jiaotong University, Beijing 100044, China
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Received: 7 December 2017 / Revised: 21 January 2018 / Accepted: 25 January 2018 / Published: 28 January 2018
(This article belongs to the Special Issue Information Theory in Game Theory)
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Abstract

Licensed Assisted Access (LAA) is considered one of the latest groundbreaking innovations to provide high performance in future 5G. Coexistence schemes such as Listen Before Talk (LBT) and Carrier Sensing and Adaptive Transmission (CSAT) have been proven to be good methods to share spectrums, and they are WiFi friendly. In this paper, a modified LBT-based CSAT scheme is proposed which can effectively reduce the collision at the moment when Long Term Evolution (LTE) starts to transmit data in CSAT mode. To make full use of the valuable spectrum resources, the throughput of both LAA and WiFi systems should be improved. Thus, a two-layer Coalition-Auction Game-based Transaction (CAGT) mechanism is proposed in this paper to optimize the performance of the two systems. In the first layer, a coalition among Access Points (APs) is built to balance the WiFi stations and maximize the WiFi throughput. The main idea of the devised coalition forming is to merge the light-loaded APs with heavy-loaded APs into a coalition; consequently, the data of the overloaded APs can be offloaded to the light-loaded APs. Next, an auction game between the LAA and WiFi systems is used to gain a win–win strategy, in which, LAA Base Station (BS) is the auctioneer and AP coalitions are bidders. Thus, the throughput of both systems are improved. Simulation results demonstrate that the proposed scheme in this paper can improve the performance of both two systems effectively. View Full-Text
Keywords: LAA; WiFi; Carrier Sensing and Adaptive Transmission; two-layer game; Collation-Auction Game-based Transaction; coexistence LAA; WiFi; Carrier Sensing and Adaptive Transmission; two-layer game; Collation-Auction Game-based Transaction; coexistence
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Li, Y.; Xu, S. Traffic Offloading in Unlicensed Spectrum for 5G Cellular Network: A Two-Layer Game Approach. Entropy 2018, 20, 88.

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