The two-volume set LNICST 645 + 646 constitutes the proceedings of the 19th International Conference on Communications and Networking in China, ChinaCom 2024, held in Chongqing, China, during November 2?3, 2024. The 40 full papers and 2 Short papers included in this book were carefully reviewed and selected from 98 submissions. They focus on Wireless Communications and MIMO systems, Unmanned Aerial Vehicles and Augmented Reality, Edge Computing and the Internet of Things, Signal Processing and Optimization Algorithms, Task Scheduling and blockchain. They were organized in topical sections as follows: Part I: Wireless Communications and MIMO systems; Unmanned Aerial Vehicles and Augmented Reality Part II: Edge Computing and the Internet of Things; Signal Processing and Optimization Algorithms; Task Scheduling and Blockchain