Patent ID: 8346253

Claim:
A method for realizing user identity association, comprising: setting an equivalent behavior user identifier in a Home Subscription Server (HSS); associating IP Multimedia Subsystem (IMS) Public User Identities (IMPUs) with equivalent behavior through the equivalent behavior user identifier; receiving, by the HSS, a request message for requesting the IMPUs with the equivalent behavior from an Application Server (AS); and presenting, by the HSS, the IMPUs with the equivalent behavior to the AS according to the request message, wherein the step of receiving the request message comprises: receiving, by the HSS, the request message carrying an identity set attribute value pair (AVP) indicating an identity type of the equivalent behavior from the AS; and wherein the step of presenting comprises: presenting, by the HSS, the IMPUs with the equivalent behavior as an IMPU in the request message to the AS, according to the identity type of the equivalent behavior as indicated in the request message.