Why do we have sequence number in RLC and PDCP?
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would say PDCP is a kind of interface between inside world and outside world. By "Inside World", I roughly mean "Network Access Network(mainly eNodeB) and Controller for eNodeB", "Network Emulator Hardware and internal firmware", and "Mobile Device (UE)". PDCP is a layer sitting at the top most part of the radio stack. In terms of basic operation, what PDCP does seems very simple. Just "adding the PDCP header to the incoming data and forward to RLC in downlink", or "removing the PDCP header from the incoming packet and forward it to IP layer in case of uplink" is all that it does. However, this layer can be pretty busy stack if you enables various additional features like Integrity, Ciphering and Header Compression. Recently (from Rel 12) as Dual Connectivity (Split Bearer) is supported, this layer has become much busier.
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