Wireless Internet. 10th International Conference, WiCON 2017, Tianjin, China, December 16-17, 2017, Proceedings

Research Article

An Enhanced Listen Before Talk (e-LBT) Mechanism for Avoiding Hidden Nodes in an LTE-U and WiFi Coexistence System

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  • @INPROCEEDINGS{10.1007/978-3-319-90802-1_21,
        author={Liangyu Chu and Jun Zheng and Jie Xiao},
        title={An Enhanced Listen Before Talk (e-LBT) Mechanism for Avoiding Hidden Nodes in an LTE-U and WiFi Coexistence System},
        proceedings={Wireless Internet. 10th International Conference, WiCON 2017, Tianjin, China, December 16-17, 2017, Proceedings},
        proceedings_a={WICON},
        year={2018},
        month={5},
        keywords={Coexistence Hidden node LBT LTE-U WiFi},
        doi={10.1007/978-3-319-90802-1_21}
    }
    
  • Liangyu Chu
    Jun Zheng
    Jie Xiao
    Year: 2018
    An Enhanced Listen Before Talk (e-LBT) Mechanism for Avoiding Hidden Nodes in an LTE-U and WiFi Coexistence System
    WICON
    Springer
    DOI: 10.1007/978-3-319-90802-1_21
Liangyu Chu1,*, Jun Zheng1,*, Jie Xiao1,*
  • 1: Southeast University
*Contact email: lychu@seu.edu.cn, junzheng@seu.edu.cn, jiexiao@seu.edu.cn

Abstract

This paper considers the hidden node avoidance problem in an LTE-U and WiFi coexistence system operating in unlicensed bands. An enhanced Listen Before Talk (e-LBT) mechanism is proposed for coordinating the LTE-U and WiFi systems. To support the e-LBT mechanism, we first enhance an LTE-U node by introducing a WiFi module in the LTE-U eNB and redefining the RRC and MAC functional blocks in both LTE-U eNB and LTE-U UE in order to enable information exchange between an LTE-U node and a WiFi node. Moreover, the e-LBT mechanism incorporates an RTS/CTS handshaking mechanism in the basic LBT mechanism to resolve the hidden node problem. Simulation results show that the proposed e-LBT mechanism can significantly improve the performance of the coexistence system in terms of LTE-U system throughput as compared with the basic LBT mechanism.