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Table of contents
1 Introduction
1.1 Context and Motivations
1.2 LTE in Unlicensed Spectrum
1.2.1 Network deployment scenarios
1.3 Research Challenges and Problem Statements
1.4 Thesis Contributions and Research Approaches
1.5 Thesis Outline
2 Inter-Radio Access Technology Coexistence: State of the art
2.1 LTE/Wi-Fi Coexistence in Unlicensed Spectrum
2.1.1 TDM-based MAC layer Protocol
2.1.2 Frame Based Equipment MAC Layer Protocol
2.1.3 Load Based Equipment MAC Layer Protocol
2.1.4 Category 4 MAC Layer Protocol
2.1.5 Enhancing LTE/Wi-Fi Coexistence
2.2 WiMAX/Wi-Fi Coexistence
2.3 Synthesis
3 TDM-based Protocol: Studying the Impact of LTE on Wi-Fi Downlink Performance
3.1 LTE/Wi-Fi Interaction
3.2 Wi-Fi Analytical Model
3.2.1 Transition Probabilities and Probability of Collision
3.2.2 Downlink Wi-Fi Throughput
3.3 Model Validation and Simulation Results
3.3.1 Comparison With Simulation Results
3.3.2 Analyzing LTE Impact on Wi-Fi
3.4 Summary
4 TDM-based Protocol: Modeling and Performance Analysis of LTE/Wi- Fi Coexistence
4.1 Revisiting Wi-Fi Analytical Models
4.2 New Wi-Fi Analytical Models
4.2.1 Slot-by-Slot Random Walk Model
4.2.2 Exponential Model for LTE
4.2.3 Frame-by-Frame Random Walk Model
4.2.4 Linking the two analytical models
4.2.5 Wi-Fi Model with Capture Effect
4.3 LTE Analytical Model
4.4 Models Validation and Simulation Results
4.4.1 Validation Through Simulation and Observations
4.4.2 Wi-Fi/LTE Coexistence Model Analysis and Application
4.4.3 Comparison Between Different LTE Configurations
4.4.4 Controlling Wi-Fi/LTE Coexistence Using the Model
4.4.5 LTE Analytical Model Validation
4.5 Summary
5 FBE Protocol: Modeling and Performance Analysis of LTE/Wi-Fi Coexistence
5.1 LTE/Wi-Fi Interaction
5.2 LTE/Wi-Fi Analytical Models
5.2.1 LTE Markov Chain Model
5.2.2 Transition Probabilities and LTE Throughput
5.2.3 LTE Renewal Process
5.2.4 Wi-Fi Throughput
5.3 Models Validation and Simulation Results
5.4 Summary
6 Category 4 Protocol: Adaptive Energy Threshold for Improved Coexistence Between Licensed Assisted Access and Wi-Fi
6.1 Coexistence Below Energy Detection Threshold
6.2 Adaptive Energy Detection Threshold Scheme
6.2.1 Scheme at the Wi-Fi side
6.2.2 Scheme at the LAA side
6.3 System Model
6.4 Performance Comparison
6.4.1 Single UE per technology located both at the cell-edge
6.4.2 Single UE per technology located both at the cell-centre
6.4.3 Multiple UE per technology uniformly distributed
6.5 Summary
7 Conclusions and Future work
7.1 TDM-based MAC layer protocol
7.2 Frame Based Equipment MAC layer protocol
7.3 Insights towards a New Hybrid MAC layer protocol
7.4 Enhancing LTE/Wi-Fi Coexistence
References
