I. Introduction 1 1.1 Backgrounds 1 1.2 Outline and Contributions 2 1.2.1 Chapter 2 2 1.2.2 Chapter 3 3 1.2.3 Chapter 4 3 1.2.4 Chapter 5 3 II. Non-terrestrial networks for UAVs: Base station Service Provisioning Schemes With Antenna Tilt 4 2.1 Introduction 4 2.2 System Model 7 2.2.1 Network Model 7 2.2.2 Channel Model 8 2.2.3 Vertical Antenna Gain 9 2.2.4 BS Association Rule 11 2.3 Outage Probability Analysis 13 2.3.1 Interference Model 14 2.3.2 Outage Probability 14 2.4 Numerical Results 18 2.4.1 Outage Probability of Ground and Air Users 19 2.4.2 Results of IS-BS Scheme 21 2.4.3 Results of ES-BS Scheme 23 2.4.4 Comparison Between IS-BS Scheme and ES-BS Scheme 24 2.5 Conclusion 27 III.Lightening Backhaul Load for Aerial Multi-hop Integrated Access and Backhaul Networks 28 3.1 Introduction 28 3.2 System Model 30 3.2.1 Network Model 30 3.2.2 Signal-to-Interference-plus-Noise Ratio (SINR) 30 3.2.3 Lightening Backhaul Load Scheme 31 3.3 Successful Transmission Probability Analysis 32 3.3.1 Association Probability 32 3.3.2 Successful Transmission Probability 34 3.4 Numerical Results 36 3.5 Conclusion 38 IV.Precoding Design for Integrated Access and Backhaul Networks: Rate-Splitting Approach 39 4.1 Introduction 39 4.2 System Model 42 4.2.1 Network Model 42 4.2.2 Signal Model of IAB Donor 43 4.2.3 Signal Model of IAB Node 45 4.3 Precoding and Backhaul Rate Design for IAB Networks With Rate-Splitting Approach 47 4.3.1 Problem Formulation 48 4.3.2 Algorithmic Design for Precoding Vector 49 4.3.3 Optimal Solution for Backhaul Rate 53 4.3.4 Algorithmic Design for Precoding Vector and Backhaul Rate 55 4.4 Numerical Results 56 4.5 Conclusion 57 V. Conclusions 59 References 60
