Section: 6.4.1 Services and Functions
Content: The main services and functions of the PDCP sublayer include: - Transfer of data (user plane or control plane); - Maintenance of PDCP SNs; - Header compression and decompression using the ROHC protocol; - Header compression and decompression using EHC protocol; - Compression and decompression of uplink PDCP SDUs: DEFLATE based UDC only; - Ciphering and deciphering; - Integrity protection and integrity verification; - Timer based SDU discard; - For split bearers, routing; - Duplication; - Reordering and in-order delivery; - Out-of-order delivery; - Duplicate discarding. Since PDCP does not allow COUNT to wrap around in DL and UL, it is up to the network to prevent it from happening (e.g. by using a release and add of the corresponding radio bearer or a full configuration).