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Facing the demand for interconnectivity sensing of three-dimensional coverage for the sixth-Generation mobile communication (6G) networks and the spectrum scarcity issue caused by the widespread access of wireless devices, the multi-dimensional expanded Integrated Sensing and Communication (ISAC), based on Unmanned Aerial Vehicles (UAV) and Intelligent Reflecting Surfaces (IRS), is capable of achieving synergistic communication and sensing functions in the three-dimensional network space. This can effectively enhance spectrum efficiency, hardware resource utilization, and align with the wireless network vision of 6G Internet of Everything. This paper provides an overview of the architecture for the 6G multi-dimensional expanded ISAC. Firstly, it summarizes the theoretical foundations of the 6G network vision and ISAC networks, and the application scenarios, development trends, and performance …