Static Contention Window Method for Improved LTE-LAA/Wi-Fi Coexistence in Unlicensed Bands



Alhulayil, Moawiah and Lopez-Benitez, Miguel ORCID: 0000-0003-0526-6687
(2019) Static Contention Window Method for Improved LTE-LAA/Wi-Fi Coexistence in Unlicensed Bands. In: 2019 International Conference on Wireless Networks and Mobile Communications (WINCOM), 2019-10-29 - 2019-11-1.

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Abstract

The 3rd Generation Partnership Project (3GPP) has recently defined a Licensed Assisted Access (LAA) scheme to enable Long Term Evolution (LTE) networks to use unlicensed frequency bands. However, the unlicensed bands are mainly occupied by the Wi-Fi technology. Hence, achieving fairness between LAA using LTE (LTE-LAA) and Wi-Fi in the unlicensed bands is a primary challenge. The 3GPP has recently standardised in Release 13 a Listen Before Talk (LBT) algorithm to ensure the fairness among these two technologies (LTE and Wi-Fi) over the unlicensed bands. In this paper, we focus on the downlink performance of LTE-LAA and Wi-Fi with different traffic loads. To achieve not only better fairness but also higher total aggregated throughputs for the coexisting networks, a static Contention Window (CW) selection method based on the fairness definition is proposed. The main novelty of this work is that the knowledge of Wi-Fi activity statistics is exploited effectively to select the CW of LAA. We show that the fairness between LAA and Wi-Fi networks depends on the LAA CW size adaptation criterion. Simulation results validate that the proposed method is effective in LAA/Wi-Fi coexistence scenario, can improve fairness performance and provide higher total aggregated throughputs for both coexisting networks compared with the current Category 4 LBT (Cat 4 LBT) algorithm defined in the 3GPP standard.

Item Type: Conference or Workshop Item (Unspecified)
Uncontrolled Keywords: 46 Information and Computing Sciences, 4606 Distributed Computing and Systems Software, 4006 Communications Engineering, 40 Engineering
Depositing User: Symplectic Admin
Date Deposited: 17 Sep 2019 15:23
Last Modified: 11 Jun 2024 01:31
DOI: 10.1109/wincom47513.2019.8942468
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3054968