<ul data-eligibleForWebStory="true">Real-time network traffic forecasting is essential for network management and resource allocation.Existing approaches assume full network traffic data, but practical scenarios often have missing data.A generative model approach is proposed for real-time network traffic forecasting with missing data.The approach models forecasting as a tensor completion problem and incorporates a pre-trained generative model for low-rank structure.The generative model captures the low-rank structure of network traffic data, simplifying the optimization process.Optimization is done on the latent representation rather than the high-dimensional tensor.A theoretical recovery guarantee quantifies the error bound of the proposed approach.Experiments on real-world datasets show accurate network traffic forecasting within 100 ms with a MAE below 0.002.