From Stat KPIs %RRC setup Succ has slightly degraded cause problem RRC radio fail greater due to attempt RRC registration increased after upgrade add FSME and spilt site. Mostly found that RRC radio fail Cells are located at the cluster border. Possibly that U900 frequency is not clean enough. Further investigation is required. Besides, Pilot Pollution of 3G900 is still polluted. ANT optimization is required.