170 Advances in Mobile Cloud Computing Systems
the platform that is flexible to new, rapid, and easy changes to the
technology.
The entire baseband DSP and time-frequency RB scheduling is
carried out by BSU located in the cloud. The AUs that are present
at the cell sites will receive digitally sampled in-phase and quadra-
ture phase (I/Q) sequence of bit streams from their respective BSUs
located in the cloud. Interference is a major issue as SPs will be main-
taining HetNets containing macrocells, microcells, picocells, and user
installed home-based femtocells. As frequency planning is cumber-
some when many users install femtocells indoors in an unplanned
manner, a flexible approach to overcome intercell interference is
needed. Cognitive radio (CR)