Section: 6.3 PDCP Sublayer
Content: In EN-DC, CA duplication (see [3]) can be applied in the MN and in the SN, but MCG bearer CA duplication can be configured only in combination with E-UTRAN PDCP and MCG bearer CA duplication can be configured only if DC duplication is not configured for any split bearer. In NGEN-DC, CA duplication can only be configured for SCG bearer. In NE-DC, CA duplication can only be configured for MCG bearer. In NR-DC, CA duplication can be configured for both MCG and SCG bearers, and can be configured together with DC duplication. In MR-DC, RoHC and EHC (as described in TS 36.323[ Evolved Universal Terrestrial Radio Access (E-UTRA); Packet Data Convergence Protocol (PDCP) specification ]  [15] and TS 38.323[ NR; Packet Data Convergence Protocol (PDCP) specification ]  [16]) can be configured for all the bearer types. In MR-DC with 5GC, UDC (as described in TS 38.323[ NR; Packet Data Convergence Protocol (PDCP) specification ]  [16]) can be configured for all the bearer types.