用于城市移动应用的后调解分组交换计费数据记录的时间精度分析
Time Accuracy Analysis of Post-Mediation Packet-Switched Charging Data Records for Urban Mobility Applications
摘要：
电信数据越来越多地用于世界各地的城市移动应用。尽管它的普遍性和实用性，技术困难出现时，使用分组交换计费数据记录（CDR），因为它的主要目的是不打算为这种应用程序。由于其特殊性质，在使用这些数据时，必须在可访问性和时间准确性之间进行权衡。一方面，为了获得高度精确的时间戳，必须提取和存储大量的网络级CDR。这个任务是非常困难和昂贵的，因为高度关键的网络节点应用程序可以在数据提取和存储中受到损害。另一方面，可以很容易地访问后中介CDR，因为在其分析中不涉及网络节点应用程序。回报是在记录的较低准确度的时间戳中，因为在计费管道的先前步骤中执行了若干聚合和过滤。在这项工作中，使用后调解CDR的时间戳错误问题的详细描述，连同一种方法来分析在每个网络单元中收集的错误时间序列。
英文摘要：
Telecommunication data is being used increasingly in urban mobility applications around the world. Despite its ubiquity and usefulness, technical difficulties arise when using Packet-Switched Charging Data Records (CDR), since its main purpose was not intended for this kind of applications. Due to its particular nature, a trade-off must be considered between accessibility and time accuracy when using this data. On the one hand, to obtain highly accurate timestamps, huge amounts of network-level CDR must be extracted and stored. This task is very difficult and expensive since highly critical network node applications can be compromised in the data extraction and storage. On the other hand, post-mediation CDR can be easily accessed since no network node application is involved in its analysis. The pay-off is in the lower accurate timestamps recorded, since several aggregations and filtering is performed in previous steps of the charging pipelines. In this work, a detailed description of the timestamp error problem using post-mediation CDR is presented, together with a methodology to analyze error time series collected in each network cell.
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