Key technical aspects concerning the realization of a reconfigurable user t
erminal based on software-defined radio technology are discussed in this ar
ticle. These include functionalities such as mode monitoring, mode switchin
g, adaptive baseband, and software download. The implications of these func
tionalities and the need for related entities within the network are also d
iscussed. The concepts presented here form part of the 5th Framework IST Eu
ropean Research project Transparent Reconfigurable Ubiquitous Terminal (TRU
ST). It is the intention of this article to present the technical achieveme
nts of the TRUST project together with an overview of the potential complex
ity in the realization of a reconfigurable user terminal.