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Erschienen in:
2018 | OriginalPaper | Buchkapitel
An Enhanced Listen Before Talk (e-LBT) Mechanism for Avoiding Hidden Nodes in an LTE-U and WiFi Coexistence System
verfasst von : Liangyu Chu, Jun Zheng, Jie Xiao
Erschienen in: Wireless Internet
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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.