Abstract. The basic principles of the physical layer of the FRAMES (Future Radio Wideband Multiple Access System) FMAZ (FRAMES Multiple Access) wideband CDMA system are described in this paper. The FMAZ is part of the FRAMES dual mode platform designed as UMTS air interface, where the harmonisation with GSM is also taken into account. The main characteristics features in the FMAZ are the asynchronous network operation and flexible layer 1 support for the variable rate transmission needs. This paper presents also performance results. which allow to conclude that the FMAZ meets UMTS air interface requirements. The FMAZ concept was a major part of the ETSI (European Telecommunications Standards Institute) wideband CDMA concept group, selected by ETSI as a basis for UMTS air interface for the paired frequency band.
An assessment of several multiple access schemes against UMTS criteria has been carried out within the FRAMES project. Based on this comprehensive evaluation, an harmonized multiple access platform has been designed consisting of two modes, a wideband TDMA with and without spreading and a wideband CDMA, which is presented hereafter. Both modes are compared against UMTS criteria. In general, they can both fulfill the UMTS objectives and will form the FRAMES input into UMTS standardization. However, Mode 1 seems more suitable for bursty type of traffic and in addition to FDD for asymmetric TDD operation while Mode 2 suits better for moderately varying circuit switched data in public radio environments.
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