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relationship between RAB setup and UE RRC state

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Raiyan
relationship between RAB setup and UE RRC state

Hi experts

is there any relationship as subject line? ex- is it possible to continue/establish a RAB in CELL_FACH/CELL_PCH state? Thought of this because smart phones should have apps which needs frequent data dl/ul. If UE always needs to enter in to CELL_DCH state for installed apps in it, then I think battery life would be very short.

Could anybody please help me to understand this? Thanks.