Method for implementing roaming charging and system thereof

A method for implementing roaming charging, comprising the steps of:

• configuring a proxy Charging Rule Function (CRF) in a Public Land Mobile Network (PLMN), wherein the proxy CRF is used for interchanging charging related information with the CRF in another PLMN;
• providing information for selecting charging rules for the proxy CRF in the currently visited PLMN;
• forwarding, by the proxy CRF, the information for selecting the charging rules to a terminal's home CRF, wherein the terminal is using bearer resources or packet data services in the currently visited PLMN;
• selecting, by the terminal's home CRF, charging rules according to the received information;
• and
• providing, by the terminal's home CRF, the charging rules for a Traffic Plane Function (TPF) which collects charging information according to the charging rules, wherein:
• configuring the proxy CRF in the PLMN comprises:
• configuring a proxy CRF for the TPF and/or an Application Function (AF) in the terminal's currently visited PLMN, wherein the proxy CRF is used for interchanging charging related information with the CRF in other PLMN;
• if it is determined according to a terminal identifier that the terminal's home PLMN is the terminal's currently visited PLMN, providing the terminal's home CRF with the information for selecting the charging rules;
• and
• if it is determined according to a terminal identifier that the terminal's home PLMN is not the terminal's currently visited PLMN, providing the proxy CRF with the information for selecting the charging rules.