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Telecommunication data is being used increasingly in urban mobilityapplications around the world. Despite its ubiquity and usefulness, technicaldifficulties arise when using Packet-Switched Charging Data Records (CDR),since its main purpose was not intended for this kind of applications. Due toits particular nature, a trade-off must be considered between accessibility andtime accuracy when using this data. On the one hand, to obtain highly accuratetimestamps, huge amounts of network-level CDR must be extracted and stored.This task is very difficult and expensive since highly critical network nodeapplications can be compromised in the data extraction and storage. On theother hand, post-mediation CDR can be easily accessed since no network nodeapplication is involved in its analysis. The pay-off is in the lower accuratetimestamps recorded, since several aggregations and filtering is performed inprevious steps of the charging pipelines. In this work, a detailed descriptionof the timestamp error problem using post-mediation CDR is presented, togetherwith a methodology to analyze error time series collected in each network cell.

Time Accuracy Analysis of Post-Mediation Packet-Switched Charging Data Records for Urban Mobility Applications