This TS provides the description of the Packet Data Convergence Protocol (PDCP).
PDCP provides its services to the NAS at the UE or the relay at the Radio Network Controller (RNC).
The Packet Data Convergence Protocol shall perform the following functions:
Header compression and decompression of IP data streams (e.g., TCP/IP and RTP/UDP/IP headers for IPv4 and
IPv6) at the transmitting and receiving entity, respectively.
Transfer of user data. This function is used for conveyance of data between users of PDCP services.
Maintenance of PDCP sequence numbers for radio bearers that are configured to support lossless SRNS
Relocation or lossless DL RLC PDU size change.
Transfer of CS counter if the radio bearer is connected to a CS domain radio access bearer.
Add and remove the padding in PDCP PDU for octet alignment.
PDCP uses the services provided by the Radio Link Control (RLC) sublayer.