CU/DU高层切分:R15阶段CU/DU高层分割采用option2,也就是将( )作为集中单元并将( )作为分布单元。
ARLC/PDCP/RRCMAC/PHY
BRLC/MAC/PDCP/RRCPHY
CRRCPDCP/RLC/MAC/PHY
DPDCP/RRCRLC/MAC/PHY
ARLC/PDCP/RRCMAC/PHY
BRLC/MAC/PDCP/RRCPHY
CRRCPDCP/RLC/MAC/PHY
DPDCP/RRCRLC/MAC/PHY