Introduction

What is GCT flow?

GCT (Geographical Cellular Traffic) is cellular traffic data augmented with the location it was generated from, calculated using Chunghwa Telecom's proprietary algorithms. With its spatial attribute, we can flexibly select regions for data collection.

GCT flow refers to the accumulated GCT within a region over a specific time interval (typically 5 minutes). Over time, the series of GCT flows reflect the patterns of the respective region, which depend on the characteristics of the surrounding area.

* For noise information, including Ping-Pong and oscillation effects (caused by mobile devices frequently switching between cell towers), Chunghwa Telecom effectively minimizes them to prevent distortion of device location representations in GCT flow calculations.

Dataset

What is Multi-type GCT flow?

We collaborated with Chunghwa Telecom to ascertain the type of user generating each Geographical Cellular Traffic (GCT), including Vehicle, Pedestrian, and Stationary types. Correspondingly, the GCT flow for each is represented by V-GCT, P-GCT, and S-GCT flows.

Leveraging multi-type GCT flows, we can initiate regional pattern analysis. For instance, commuting areas predominantly display a higher proportion of V-GCT flow compared to P-GCT and S-GCT flows. Conversely, in residential-commercial areas, P-GCT and S-GCT flows are relatively more significant.

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Authors

ChungYi Lin

Ph.D. candidate in the Graduate Institute of Networking and Multimedia at National Taiwan University

Senior Researcher in the Department of Internet of Things at Chunghwa Telecom Laboratories.

Shen-Lung Tung

Ph.D. from the Department of Electrical Engineering at National Central University

Senior Researcher in the Department of Internet of Things at Chunghwa Telecom Laboratories.

Winston H. Hsu

Professor in the Department of Computer Science and Information Engineering at National Taiwan University.