FBS-TGCN: a temporal graph-convolutional-network model for spatiotemporal prediction of spam messages from fake base stations

Abstract

Spam messages affect the normal communication of mobile phone users and public security. Fake base station (FBS) is the main channel for sending spam messages. Accurate spatiotemporal prediction of spam messages from FBS is important for implementing short-term spam prevention measures by the police. However, existing models used for spam messages modeling often focus on capturing spatial dependencies based on distance, thus failing to fully exploit spatial dependencies hidden in the data. Meanwhile, they encounter difficulties in mitigating the impact of excessive zero data. Therefore, based on the crowdsourced spam message data, a temporal graph-convolutional-network model (FBS-TGCN) is developed for the spatiotemporal prediction of spam messages from FBS. This model includes graph convolutional network (GCN) and gated temporal convolutional network (TCN) to capture the spatial and temporal dependencies alternatively. We further combine a weighted adjacency matrix and a self-adaptive adjacency matrix to capture both distance-based spatial dependencies and hidden spatial dependencies. A weighted loss function is used to mitigate the influence of excessive zero data. Experimental results using the spam dataset in Beijing demonstrate the effectiveness of the proposed model when compared to the baseline models, especially in the prediction of spam messages quantity and high spamming areas.