  The geometrical spectra in loop quantum gravity (LQG) suffer from ambiguity
up to the free Immirzi parameter that is often determined by comparing results
from the theory with the established dynamics at the black hole horizon. We
address conceptual difficulties associated with such approaches and point out
that the Immirzi parameter can be fixed naively by applying the LQG version of
the equipartition rule at a holographic boundary such that the Hawking-Unruh
temperature law follows. The value of the Immirzi parameter derived in this way
should possess universal validity. This approach also provides a clue that this
parameter could be rooted in the holographic principle.
