Performance-Fairness Trade-off for Wi-Fi and LTE-LAA Coexistence

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 nonoverlapping 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 intranetwork fairness of the proposed LAA network over the conventional LAA network.INDEX TERMS Licensed assisted access (LAA), Wi-Fi, proportional fairness, random channel access, transmit power control.

Performance Analysis of Dual-Hop AF Cognitive Relay Networks with Best Selection and Interference Constraints

“…Due to the exponential increase in demand for mobile communication and the shortage of licensed bands, network providers and researchers have been continuously working over the last decade on different techniques to find a solution for these challenging problems. One of the obtained solutions is to exploit the unlicensed spectrum bands for mobile communication [1][2][3]. Therefore, different algorithms and techniques were proposed to allow mobile networks to access a few unlicensed spectrum bands such as the 2.4 GHz and 5 GHz bands, which are essentially occupied by Wi-Fi technology [4][5][6][7].…”

A new fair-efficient spectrum allocation scheme for the LTE and WiFi coexistence platform

“…attentions toward utilizing the unlicensed spectrum. In this regard, a variant of longterm evolution (LTE) technology, called licensed-assisted access (LAA), has been proposed to provide enhanced LTE services by sharing the unlicensed 5 GHz band, which is mainly used by WiFi networks [1][2][3].…”

“…In this paper, we investigate the LTE/WiFi system infrastructure, and construct the most appropriate spectrum allocation scheme in a fair-efficient manner. This approach can maximize the LTE/WiFi system performance while ensuring a desirable service fairness under diversified traffic environments [3,6].…”