I. INTRODUCTION
A. Overview of 6G
B. Requirements and Challenges of 6G Channel Research
C. Paper Contributions and Organization
II. MODELING METHODOLOGY OF ITU/3GPP STOCHASTIC CHANNEL
A. Large-Scale Channel Fading
B. Small-Scale Channel Fading
III. THZ CHANNEL MEASUREMENTS AND MODELS
A. THz Channel Measurements
B. Important Channel Propagation Characteristics in THz Bands
C. THz Channel Modeling
D. Summary and Prospects
IV. E-MIMO CHANNEL MEASUREMENT AND MODELING
A. E-MIMO Channel Measurement
B. E-MIMO Channel Characteristics
C. E-MIMO Channel Modeling
D. Summary and Prospects
V. ISAC CHANNEL MEASUREMENT AND MODELING
A. ISAC Channel Measurement Progress
B. ISAC New Channel Characteristics
C. ISAC Channel Modeling
D. Summary and Prospects
VI. RIS CHANNEL MEASUREMENT AND MODELING
A. RIS Channel Measurements
B. RIS Channel New Characteristics
C. RIS Channel Modeling
D. Summary and Prospects
VII. SAGIN CHANNEL MEASUREMENTS AND MODELS
A. SAGIN Channel Measurements
B. SAGIN Channel Characteristics
C. SAGIN Channel Modeling
D. Summary and Prospects
VIII. 6G CHANNEL SIMULATOR
A. Development of Channel Simulators for 6G
B. Basic Simulation Framework of BUPTCMG-6G
C. Software Structure and Functions
D. Applications
E. Summary and Prospects
IX. CONCLUSIONS