Service Mobility with SIP, SDP and MPEG-21

The ubiquitous access to multimedia services anywhere and at any time requires flexible service accommodation to user requirements and to device capabilities. At mobility of persons and devices, it is possible to enforce not only terminal-based adaptations, but also the media sessions can migrate from device to device to optimize the user experience. As the capabilities of mobile hand-held devices are limited, migrating sessions to close-by high-performance terminals like wall displays or in-home entertainment systems will indeed contribute to optimized device application and to more satisfactory media consumption. The current SIP/SDP framework can partially enable a session-migration process. However, SIP/SDP lacks advanced client-search and description capabilities. On the other hand, MPEG-21 DI can support sophisticated service descriptions but it misses a control-data exchange approach. Therefore, this paper proposes to merge concepts from IMS using SIP/SDP(ng) with MPEG-21 DI to implement a novel session migration concept based on standardized mechanisms.