DL - 4G Americas

Once each Building Block item is completed, a decision will be made as to which parts of the Building
Blocks are to be transferred to normative specifications.
8.5 POTENTIAL AREAS OF FUTURE STANDARDIZATION
The following features have not been agreed to date for Rel-11, but may be considered in the future for
standardization in Rel-11 or beyond.
a) Enhanced Carrier Aggregation for LTE: Some example of enhancements are as follows:
i. Extension carrier for DL
ii. Multiple timing advances for different UL bands
b) MIMO Enhancement for LTE-Advanced (e.g. enhancements to Multi-User MIMO): These
enhancements can be considered under the CoMP SI
c) 4X4 MIMO for HSPA+
d) Carrier Aggregation between HSPA+ and LTE
www.4gamericas.org February 2011 Page 94