Start Date: 01-10-1995 Duration: 36 months Contract Type IP


RAINBOW (Radio Access Independent Broadband On Wireless) investigates, through a laboratory implementation, the architectural and intergration issues relevant to expected transport and mobility cntrol functions of UMTS. The implementation is based on the conceptual designs development within the project. The radio access part of UMTS is implemented mainly to study a “generic” UMTS access infrastructure capable of coping with different innovative radio access techniques and, at the same time,guaranteeing a soft migration from the second to third generation mobile systems. All local transport and control functions associated with terminal mobility (e.g. handover) are studied by implementing a platform emulating the radio behaviour of the adopted radio access techniques. The infrastructure is intergrated with the B-ISDN network to realise the IN based service functions needed to control the upper layer mobility procedures.

Technical Approach

The test-bed implements the UMTS access infrastructure with the relevant transport and control functions.The intergration and interworking with IBC are achieved by using National Host facilities to provide B-ISDN Call Control capabilities and ATM transport in the Core/Access Network.The test-bed works in real time to experiment with voice and data traffic.The intergrated test-bed will be built on an emulated platform modelling the radio,traffic and user mobility encountered in real environment. Architectural solutions will be implemented by carrying-out specific laboratory demonstrations adopting second generation systems (GSM and DECT) on the UMTS access infrastructure. Specific results of RACE II projects relevant to the UMTS network functions and the emulated radio environments are extensively used as specifications for the experiments. The radio segment of the demonstrator is defined so that innovative radio access techniques, developed by other projects within the ACTS framework, can be managed by the generic mobility control functions. In particular, it is planned to replace the RAINBOW radio path emulator with the FRAMES base stations that will be controlled by the RAINBOW network infrastructure. A study will extend the system concepts developed in RAINBOW to analyse the support of the Internet by the UMTS system, and investigate the applicability of the software radio concept and assess the possibility of achieving multi-media/multi bearers calls and inter LE handover.


• Alcatel
• Alcatel Bell
• Aldiscon
• DeTeMobile
• Gie Cegetel
• Intracom
• KPN Research
• Lucent Technologies
• Nortel
• Telefonica de Espana
• University of Athens
• University of Limerick