PSCH和SSCH只用于『____』和『____』,不承载层2和层3的任何信令,属于物理层信号。(PSCH and SSCH o

PSCH和SSCH只用于『____』和『____』，不承载层2和层3的任何信令，属于物理层信号。(PSCH and SSCH only use in 『____』and 『____』, not the bearing level 2 and the level 3 any signaling, that belongs to the physical level signal.)