Downlink Power Control In LTE
The eNodeB determines the downlink transmit energy per resource element (EPRE). Downlink cell-
specific reference-signal (RS) EPRE is constant across the downlink system bandwidth and constant
across all subframes until different cell-specific RS power information is received. The downlink RS EPRE
is given by the parameter Reference-signal-power provided by higher layers.
In cases 16QAM, 64QAM, spatial multiplex TRI>1 or multi-user MIMO the DL power is given by ρA and
ρB
A = + P power-offset ρ δ
or
10log (2) power-offset 10 = + + A A ρ δ P
(if precoding for transmit diversity with 4 cell-specific antenna ports is used.) Furthermore PA and PB are
signalled values, also setting the ratio
δpower-offset is used for multi-user
MIMO Depending on the number of antenna ports and CP configuration ρA and ρB are applied to the
OFDM symbols 0..6.
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