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Probability of Coexistence of LTE-LAA and WLAN Systems Based on Delay Constraints



Yao Ma, William Young, Eric W. Anderson, Jason Coder


To support efficient spectrum sharing and related standardization efforts in unlicensed spectrum, it is important to develop analytical tools to accurately quantify coexistence performance between long-term evolution license assisted access (LTE-LAA) and legacy systems, such as wireless local area network (WLAN). Though joint throughput of spectrum sharing LTE-LAA and WLAN systems has been extensively studied, there lacks a systematic study on a high level metric -- the probability of coexistence (PoC), which indicates whether the coexistence is successful or not. Another problem is that majority of available results either ignored delay constraints, or studied only the mean (or variance) of delay, but have not considered the delay distribution and its impact on the throughput. To address these problems, we define and analyze original PoC metrics between LTE-LAA and WLAN systems based on two practical delay constraints. The first PoC is based on the joint distribution probability of delays for successful transmissions; and the second PoC is defined upon the joint probability of delay-constrained throughput (DCT) of LAA and WLAN systems. To address the involved technical difficulties, we design a novel analytical framework to evaluate the moment generating function (MGF) and cumulative distribution function (CDF) of the delay, and a new method to evaluate the DCT and its CDF. Consequently, the PoCs can be evaluated accurately with low complexity. The analytical results are verified by our Monte carlo simulations, which demonstrate impacts of delay and throughput requirement on the PoCs, and illustrate some design tradeoffs and insightful findings. These results provide theoretical and practical value for designing improved LTE-LAA and WLAN systems, and may be extended to other emerging spectrum sharing communication systems.
Proceedings Title
The 27th International Conference on Computer Communications and Networks (ICCCN 2018)
Conference Dates
July 30-August 2, 2018
Conference Location
Hangzhou, CN


WLAN, LTE-LAA, Probability of Coexistence, Delay-Constrained Throughput, Delay Outage Probability


Ma, Y. , Young, W. , Anderson, E. and Coder, J. (2018), Probability of Coexistence of LTE-LAA and WLAN Systems Based on Delay Constraints, The 27th International Conference on Computer Communications and Networks (ICCCN 2018), Hangzhou, CN, [online], (Accessed May 30, 2024)


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Created July 29, 2018, Updated April 19, 2022