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Coexistence Analysis of LTE and WLAN Systems With Heterogenous Backoff Slot Durations



Yao Ma, Daniel G. Kuester, Jason B. Coder, William F. Young


To enable constructive coexistence with wireless local area network (WLAN), unlicensed long-term evolution (LTE) systems use listen before talk (LBT) as a major candidate technique. The LBT has flexible backoff idle slot duration, which can be significantly larger than the WLAN counterpart. To our knowledge, however, available analytical results on the LTE and WLAN coexistence have considered only identical backoff slot durations. There is formidable technical difficulty to coexistence analysis for different backoff slot durations. In this paper, we develop a new technical approach to address this open issue. First, we point out an LBT backoff slot jamming effect, and propose a modified LBT backoff scheme to avoid this problem. Second, we develop a new analytical framework to address system interactions with non-equal backoff slot durations, model the LTE backoff process as super-counters, and provide a thorough analysis on the throughput, backoff counter hold time, and successful transmission probabilities of LTE-LBT and WLAN systems. Finally, our extensive computer programming and simulation results validated the analysis. This result fills a major gap and provides practical value for MAC-layer LTE-LBT and WLAN coexistence performance analysis with heterogeneous sensing and backoff slot durations.
Conference Dates
May 21-25, 2017
Conference Location
Conference Title
IEEE International Conference on Communications (ICC) 2017


LTE, WLAN, Coexistence Analysis, CSMA/CA, MAC-layer Performance


Ma, Y. , Kuester, D. , Coder, J. and Young, W. (2017), Coexistence Analysis of LTE and WLAN Systems With Heterogenous Backoff Slot Durations, IEEE International Conference on Communications (ICC) 2017, Paris, -1, [online], (Accessed May 19, 2024)


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Created May 21, 2017, Updated January 27, 2020