Tracing information acquisition method, device and system

Provided are a source tracing information acquisition method, device and system, the method being applicable to a communication system comprising a control plane CP and a user plane UP separated, the communication system comprising a CP device and a first UP device, the method comprising: in response to meeting a first condition, the CP device sending a first charging message to the first device, the first charging message comprises an identifier of the first UP device, the first charging message is related to a message corresponding to a first user transmitted by the first UP device, and the identifier of the first UP device is used for indicating that the traceability information of the first user is related to the first UP device. The traceability information acquisition method provided by the invention can meet the requirement of acquiring more traceability information. 本申请提供了一种溯源信息获取方法、装置和系统，该方法可以应用于包括控制面CP和用户面UP分离的通信系统中，该通信系统包括CP设备和第一UP设备，该方法包括：响应于满足第一条件，该CP设备向第一设备发送第一计费报文，该第一计费报文包括该第一UP设备的标识，该第一计费报文与该第