LBT Enhancement for LTE-LAA Fair Coexistence
Amsatou Mbengue, Yongyu Chang · International Journal of Future Generation Communication and Networking · 2017
A common approach to increase wireless network capacity is to use additional spectrum.LTE in the unlicensed spectrum band has been introduced in the release 13 of 3GPP as Licensed Assisted Access (LAA).The LTE technology in the unlicensed band is enabled by Listen Before Talk (LBT) procedure for fair coexistence with other wireless technologies (i.e., Wi-Fi) operating in the same spectrum.LBT based on binary exponential back-off known as LBT category 4 can achieve a fair coexistence in low buffer but presents some limitations under full buffer evaluation.In this paper we propose different LBT mechanisms and evaluate their performances based on 3GPP coexistence scenarios (LAA/Wi-Fi, LAA/LAA).The simulation results show that the LBT category 4 with Optimal Constant Contention Window (OCCW) and the proposed fixed periodic LBT (P-LBT) can achieve better performance under saturation state even better than Wi-Fi only coexistence.