Chapter 6

Packet Data Convergence Protocol Functions

The packet data convergence protocol (PDCP) sublayer is part of LTE layer 2 protocols, which is responsible for the IP header compression of user-plane data packets in order to reduce the number of information bits transmitted over the air-interface and to improve transmission efficiency. The PDCP sublayer is also responsible for ciphering and integrity protection of RRC messages, as well as in-sequence delivery and duplicate removal. At the receiver side, the PDCP protocol performs the corresponding deciphering and decompression operations. There is one PDCP entity per radio bearer configured for a terminal. The main services and functions of the PDCP on the control-plane include ciphering ...

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