Effect of Channel-Quality Indicator Delay on HSDPA Performance

This paper evaluates the effect of the channel estimation inaccuracy on the performance of an HSDPA system. This study provides some results from system level simulations that have been conducted over a very complete dynamic simulator which models an HSDPA system full compliant with specifications. This emulator allows performing multi-user transmission and link adaptation with a limited Modulation and Coding Scheme (MCS) selection based on the Channel Quality Indicator (CQI) modes. Many factors such as the User Equipment (UE) speed, the employed scheduling algorithm or the traffic load have been considered in the assessment.