SESSAMO: Session Mobility for Video Streaming Applications

Nowadays, telecom operators are making a remarkable progress in providing a wide offer of broadbandaccess to answer the high demand for high bit rate applications. Nevertheless, user requirements do notstop at providing high rate connection, but exceeds it to ensuring transparent service portability among hisequipments. The user would like to choose among his devices those which respond at best his needs andconstraints. From small smart phones to large screen devices, the customer enjoys its entertainments orbusiness meetings according to its current situation. Service continuity over different terminals known assession mobility is a challenging operation in terms of handover latency, context transfer and mediaadaptation. Moreover, this transfer requires synchronization between the involved terminals.In this paper we present “SESSAMO”, a new lightweight session mobility protocol for streamingapplications using RTSP. This solution is transparent to the network and does not require any changes inthe client or server streaming application. The solution is detailed and a set of measurement results arepresented. In addition, we present a new method to renegotiate session parameters following terminalcapacities in order to adapt the flow accordingly. Renegotiation proposal is based on the use of SDPng andMPEG-21.