Patent ID: 8392324

Claim:
A method for charging correlation, comprising: receiving, by a sub-service server, a multi-service identifier of a multi-service and a sub-service identifier of a sub-service of the multi-service from a service control function entity, and a service identifier assigned for an application or service, wherein the multi-service identifier and the sub-service identifier are assigned by the service control function entity for the multi-service and the sub-service of the multi-service respectively, the multi-service comprises at least two sub-services each corresponding to one sub-service server; correlating Charging Data Records (CDRs) generated for a plurality of sessions of a same user, a plurality of sessions of a part of or all users or a plurality of sub-services in the application or service based on the service identifier, generating, by the sub-service server, a CDR for the sub-service that corresponds to the sub-service identifier; and sending, by the sub-service server, the CDR, the multi-service identifier and the sub-service identifier to a billing center via a charging information collecting function entity corresponding to the sub-service server, so as to enable the billing center to correlate the CDR with the sub-service identifier, and to correlate the correlated CDR with the multi-service identifier.