  In this paper, we devise a novel radio resource block (RB) structure named
dynamic resource block structure (D-RBS) which can handle low latency traffics
and large fluctuations in data rates by exploiting smart time and frequency
duplexing. In our framework, the main resource block with a predefined
bandwidth and time duration is divided into several small blocks with the same
bandwidth and time duration. Depending on the service requirements, e.g., data
rate and latency, the users are assigned to some these small blocks which could
be noncontiguous both in frequency and time. This is in contrast to the
previously introduced static resource block structure (S-RBS) where the size of
each RB is predetermined and fixed. We provide resource allocation frameworks
for this RB structure and formulate the optimization problems whose solutions
are obtained by alternate search method (ASM) based on successive convex
approximation approach (SCA). We provide a global optimal solution by
exploiting the monotonic optimization method. By simulation we study the
performance of our proposed scheme with S-RBS scheme and show it has 26% gain
compared to the S-RBS scheme.
