LTE spec

3GPP Releases
http://www.3gpp.org/specifications/67-releases

3GPP specification Release version matrix
http://www.3gpp.org/DynaReport/SpecReleaseMatrix.htm

Master Telecom Faster - Fast tracks into the LTE Specifications
http://www.mastertelecomfaster.com/index.php

Master LTE Faster - The SpecTool - LTE Protocols
http://www.masterltefaster.com/index.php

LTE/SAE Call Flow Diagrams @ GSM, SIP, H.323, ISUP and IMS Call Flows
http://www.eventhelix.com/realtimemantra/Telecom/#LTE_SAE_Call_Flow_Diagrams

Telecom • Networking • Software
http://www.eventhelix.com/RealtimeMantra/#.VnzvgjWkVC0

LTE (Long Term Evolution) Tutorials and Call Flows
http://www.eventhelix.com/lte/#.VnzxXDWkVC0

Networking Protocol Sequence Diagrams
http://www.eventhelix.com/Realtimemantra/Networking/#.VnzxQDWkVC2

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PDCP
http://www.eventhelix.com/lte/presentations/3GPP-LTE-PDCP.pdf