重庆邮电大学学报（自然科学版）2017，Vol.29Issue(5)：590-597,8.DOI:10.3979/j.issn.1673-825X.2017.05.003
LTE-U与WiFi系统在非授权频段共存机制研究
Coexistence mechanism of LTE-U and WiFi systems in the unlicensed spectrum
摘要
Abstract
The deployment of the long-term evolution (LTE) systems in the unlicensed spectrum has been considered as an effective way to alleviate the current shortage problem of spectrum resources.However,the primary challenge is the coexistence between LTE systems and WiFi systems in the unlicensed spectrum.In this paper,we propose two access mechanisms:listening before talking (LBT) based random access mechanism (LBT-RA) and listening and talking (LAT) based collisions avoidance access mechanism (LAT-CA) to reduce the overall collision probabilities and increase the spectrum utilization ratio while ensureing the transmission performance of WiFi systems.LBT-RA is based on LBT detection method,which performs clear channel assessment (CCA) before transmission and could random access the available unlicensed band according to detection results.LAT-CA is based on the LAT detection method of full-duplex technology,which could achieve the simultaneous operations of sensing and transmission while reducing the collisions probability of users.Simulation results show that the proposed LBT-RA and LAT-CA mechanism can effectively improve the utilization of the unlicensed spectrum,and ensure the harmonious coexistence of LTE-unlicensed (LTE-U) and WiFi systems.关键词
非授权频段LTE(LTE-U)/频谱利用率/共存机制Key words
LTE-U(LTE-unlicensed)/spectrum utilization ratio/coexistence mechanism分类
信息技术与安全科学引用本文复制引用
黄晓舸,李扬扬,刘思嘉,陈前斌..LTE-U与WiFi系统在非授权频段共存机制研究[J].重庆邮电大学学报（自然科学版）,2017,29(5):590-597,8.基金项目
国家自然科学基金(61401053) （61401053）
长江学者和创新团队发展计划(IRT1299)The National Natural Science Foundation of China (61401053) （IRT1299）
The Program for Changjiang Scholars and Innovative Research Team in Universities (IRT1299) （IRT1299）
