Requirements for mobility support in ATM

This paper deals with the integration of future mobile systems in a B-ISDN environment, namely, the transport functions required for the support of terminal mobility. Handover (involving an air interface), rerouting (routing optimisation in the fixed network), macro-diversity and mobile trunk connections are defined and the involved transport functions are mapped to the ATM layer of the B-ISDN protocol reference model. This results in the identification of the ATM layer functions which can be reused from the B-ISDN and those which need to be added for mobility support.