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Slot Jamming Effect and Mitigation Between LTE-LAA and WLAN Systems With Heterogenous Slot Durations
Yao Ma1, Daniel G Kuester1, Jason Coder1
1Communications Technology Laboratory, National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado, USA.
IEEE Transactions on Communications. IEEE Communications Society
|July 6, 2019
Summary
A new anti-slot-jamming (ASJ) scheme effectively mitigates slot-jamming effects in long-term evolution license-assisted access (LAA) systems. This improves channel access probability and throughput for better spectrum sharing with wireless local area networks (WLANs).
Area of Science:
- Wireless communication
- Spectrum sharing technologies
- Radio access networks
Background:
- Long-term evolution (LTE) license-assisted access (LAA) utilizes unlicensed spectrum, necessitating efficient spectrum sharing with incumbent systems like wireless local area networks (WLANs).
- Listen-before-talk (LBT) is a proposed LAA channel access method, potentially using larger backoff-slot durations than WLANs.
- A significant slot-jamming (SJ) effect can arise from differing backoff durations, degrading LAA-LBT link performance, specifically channel access probability (CAP) and throughput.
Purpose of the Study:
- To investigate the slot-jamming (SJ) effect in LAA-LBT systems operating in unlicensed spectrum.
- To propose and evaluate an effective anti-slot-jamming (ASJ) LBT scheme to mitigate the SJ effect.
- To develop a novel performance analysis framework for coexisting systems with disparate slot durations.
Main Methods:
- Development of a new performance analysis approach for heterogeneous coexisting systems.
- Modeling the LAA backoff process using super-counters for in-depth analysis.
- Derivation of key performance indicator (KPI) statistics, including backoff hold time, successful transmission probability, CAP, and throughput.
- Validation of analytical results through comprehensive simulations.
Main Results:
- The proposed anti-slot-jamming (ASJ) LBT scheme effectively mitigates the slot-jamming (SJ) effect.
- The novel analytical approach accurately predicts performance metrics for systems with different slot durations.
- Simulation results confirm the analytical findings and the efficacy of the ASJ-LBT scheme.
Conclusions:
- The ASJ-LBT scheme offers a robust solution for improving spectrum sharing between LAA and WLAN systems.
- The developed analytical framework provides valuable insights into system performance and coexistence.
- This research addresses a critical gap in spectrum sharing, with potential applications for optimizing heterogeneous wireless systems.
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