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Packet Data Convergence Protocol

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PDCP stands for Packet Data Convergence Protocol. It is one of the layer of the Radio Traffic Stack in UMTS and performs IP header compression and decompression, transfer of user data and maintenance of sequence numbers for Radio Bearers which are configured for loseless SRNS relocation.

The compression technique can be based on either RFC 2507 or RFC 3095.RFC 1144 can also be used for some help but it's not used now a days, still it gives you the idea how does the compression/decompression techniques look like.

If PDCP is configured for No Compression it will send the IP Packets without compression else it will compress the packets according to it's configuration by upper layer and attach PDCP header and send the packet.It uses the service provided by lower layer called RLC.

PDCP header consists of two fields PID and PDU TYPE.The PDU type field indicates whether the PDU is Data PDU or Seq Num PDU. The PID field value indicates header compression protocol type used and packet type or CID.

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