MECHANISM TO SUPPORT TRANSPARENT ROAMING BETWEEN IMP SERVICE PROVIDERS IN WIRELESS NETWORKS

摘要

The instant messaging and presence (IMP) protocol implementations are swapped in and out as a client application roams among various service provider networks. The IMP API, and hence the IMP application, remains unchanged. Moreover, the IMP application continues to operate seamlessly and transparently. When the client application roams and a service provider change is detected, the system signals to the new service provider a profile containing the old IMP session details. A new IMP implementation is swapped into the existing IMP application. The IMP implementation may be downloaded in real-time, or it may exist on a SIM card or an SD card, or other suitable memory device.