During the application of HSPA, some questions occurred and needed to be solved, such as how to solve the problem the discontinuous CQI feedback will create, how to increase the control channel efficiency and how to increase the HSPA resource efficiency. Due to the fact that multi-carrier HSPA is backward compatible with HSPA, the same questions also exist in multi-carrier HSPA. In order to solve these questions, the SI "HSPA Feedback and Signalling Efficiency Enhancements for LCR TDD" is approved at the RAN#54 meeting. This TR summarizes all the study results of the SI "HSPA Feedback and Signalling Efficiency Enhancements for LCR TDD".

The present document summarizes the study results of the SI "HSPA Feedback and Signalling Efficiency Enhancements for LCR TDD". The study results focus on the following three study items.

1. CQI feedback enhancement
   • Evaluate the impact the discontinuous CQI feedback will create
   • If needed, find out how to solve the problem the discontinuous CQI feedback will create
   • Evaluate how much gain will be obtained with the new methods.
2. HSPA control channel efficiency optimisation
   • find out the new methods for increasing the HSPA control channel efficiency.
   • Evaluate how much gain will be obtained with the new methods.
3. HSPA signalling enhancements for more efficient resource usage
   • find out the new methods for more efficient HSPA resource usage
   • Evaluate how much gain will be obtained with the new methods.