Roaming charging method, related device and online charging system

The invention provides a roaming charging method, a related device and a system. In the roaming charging method provided by the embodiment of the invention, embedded PCRF (Policy Control Rule Function) equipment acquires ARP (Alternative Roaming Provider) ordering information of a subscriber from a CBP (Convergent Billing Point) and acquires ARP package usage amount of the subscriber from an ARP OCS (Online Charging System), and then the PCRF equipment performs policy decision-making on the subscriber according to the ARP package usage amount; and then home PCEF (Policy and Charging Enforcement Function) equipment performs policy control on the subscriber according to a control policy issued by the PCRF equipment, and the subscriber can start to use the traffic of an ARP package. Compared with the prior art, the roaming charging method provided by the embodiment of the invention can be applicable to charging in a convergent OCS scene and is good in adaptability. 本发明提供了种漫游计费方法、相关装置及系统。在本发明实施例提供的漫游计费方法中，嵌入式PCRF