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In this article, we present a novel architecture of mobile networks referred to as mobile ubiquitous service environment (MUSE), which aims to bring users always best experiences (ABE) employing heterogeneous networks and personal area networks. We aim to provide a uniform ubiquitous service environment, which consists of detectable, representable, evaluable, expansible, and adaptable abstract features. Thus, it appears as homogeneity to the services. We aim for the joint utilization of the capabilities provided by novel terminals and heterogeneous networks. As a result of this view, we introduce two interactive environments, the terminal service environment (TSE) and network service environment (NSE), which provide the MUSE capabilities to bring experiences to users. In this paper, the design principles of MUSE and the ABE concept are presented, and the QoS framework and the reconfiguration, which play key roles in MUSE, are presented in more detail.