03_rn31633en50gla0_ranpar_1_cchs_and_powercontrol_v1.0_ru50_nokia
DESCRIPTION
gaiTRANSCRIPT
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RN31633EN50GLA0
Common Channels & Power Control
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Most common channel have fixed configuration & power:
CPICH
P-CCPCH
P/S-SCH
AICH
PICH & SCCPCH power depends on selected configuration
PICH: depending on paging repetition used per radio frame (10ms)
SCCPCH: depending on number of SCCPCH used
Setting the DL Common Control Channel Power is a trade off between:
cell coverage: all the channels must be decoded at the cell edge
cell capacity: the common channel power consume resources from the traffic channels
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UE transmits the first preamble with the power determined by UL open loop PC
If the UE does not detect any acquisition indicator in AICH, it increases the preamble Tx power by a specified offset Po
If the UE detects the positive indicator in AICH, it transmits the random access message, 3 or 4 access slots after the UL access slot of the last transmitted preamble
The Tx power of the control part of random access message should be Pp-m higher than the last transmitted preamble power
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