This 4G Americas whitepaper is intended to provide a brief review of some of the key specifications in 3GPP Release 11.
3GPP Rel-11 standards for HSPA+ and LTE-Advanced were frozen in December 2012 with the core network protocols stable in December 2012 and radio access network (RAN) protocols stable in March 2013.
Since its introduction, LTE is continuously worked on in terms of improvements. 3GPP groups added technology components into so called releases. Initial enhancements were included in 3GPP Release 9, followed by more significant improvements in 3GPP Release 10, also known as LTE-Advanced.