Abstract
As the heterogeneity of wireless access technologies increases, dynamic allocation and utilisation of spectrum become ever more important. The traditional rigid allocation of spectrum for technology-specific usage is not suitable for the increasingly dynamic demand driven by the continuous emergence of technologies providing new services with different quality of service requirements. New spectrum management techniques and increasingly flexible spectrum usage rights are therefore called for. We discuss the limitations of present spectrum management techniques and explore some new alternatives including spectrum trading and opportunistic spectrum access.
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