Abstract
Long Term Evolution (LTE)-License Assisted Access (LAA), which leverages unlicensed resource sharing with the Wi-Fi network, is a promising technique to address the spectrum scarcity issue in present and future wireless networks. However, unlicensed spectrum sharing between Wi-Fi and LAA requires fair resource allocation with specific performance guarantees for both sets of Wi-Fi and LAA stations. In this paper, an optimal communication policy is devised for LAA stations coexisting on a single unlicensed channel with Wi-Fi stations. The inter-network collisions are avoided through non-overlapping transmission phases for Wi-Fi and LAA networks. The throughput performance of LAA network is maximized while guaranteeing a proportionally fair performance among LAA stations and a fair share for Wi-Fi stations. The proposed scheme, unlike the state-of-the-art coexisting mechanism, jointly optimizes the transmission probability and the transmission rate for each LAA station. The formulated optimization problem to maximize network throughput is solved analytically. The numerical results demonstrate a significant improvement in the LAA throughput, more than 75%, as compared to the case when transmission probabilities are not optimized. Moreover, a notable gain of 8-9% in the fairness index reflects the intra-network fairness of the proposed LAA network over the conventional LAA network.
Highlights
Wireless communication industry has turned its attention towards utilizing the unlicensed spectrum as an efficient means to address the spectrum scarcity and rapidly growing demand for data traffic by users [1]
Different variants of the fourth generation Long Term Evolution (LTE) have been proposed to leverage the unlicensed 5 GHz band which is mainly used by the Wi-Fi network, e.g., LTE unlicensed (LTE-U), LTE licensed assisted access (LAA) and MulteFire [2]
In this paper, a fair coexistence scheme is proposed for the Wi-Fi and LAA network
Summary
Wireless communication industry has turned its attention towards utilizing the unlicensed spectrum as an efficient means to address the spectrum scarcity and rapidly growing demand for data traffic by users [1]. In this regard, different variants of the fourth generation Long Term Evolution (LTE) have been proposed to leverage the unlicensed 5 GHz band which is mainly used by the Wi-Fi network, e.g., LTE unlicensed (LTE-U), LTE licensed assisted access (LAA) and MulteFire [2]. In release 13, the 3rd generation partnership project (3GPP) issued LTE-LAA as a global standard to coexist with the unlicensed band [4].
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