With the advent of 5G era, interest in time-sensitive services is growing, and even more so with upcoming 6G. Hyper-immersive interactive service such as hologram communication, and high-precision vertical service such as remote control of machine/ robot/drone are two representative time-sensitive service types. In order to realize the services end-to-end, not only mobile communication but also packet network technology must be considered together. This presentation will briefly introduce recent packet network technologies guaranteeing in-time/on-time and lossless delivery of data to meet the service requirements, discuss their limitations and issues, and share ETRI’s approach to solve them.