Accessibility support for persons with disabilities by total conversation service mobility management in Next Generation Networks

This paper describes the principles and concepts necessary to support total conversation service mobility within a fixed/mobile converged telecommunication network. Regarding the network platform, this paper considers the functional architecture of the Next Generation Network (NGN), as the International Telecommunication Union (ITU) standardizes it. The presented procedure shall enable persons, who are disabled by deafness, speech disabilities and/-or vision disabilities, to use the advantages of fixed/mobile converged telecommunication networks not only in a stationary situation but also when they are mobile. A strong focus is given on the support of context based service performance adaptation. Different handover scenarios are considered, including devices and network access of different capabilities.