dkumar,
i’m afraid your issue requires someone that knows about ericsson.. i’m not sure i understand what is ICM 🙂
anyway, if your qos looks like there is a lot of interference, and there is no interference from your own network, and there is no hardware faults, then i would suggest you are facinf an external interferer (other operators, other technologies, alarm system, army radar, anti-theft systems, etc etc etc)
you could perform some frequency scanning in the area, while turning your site off for a while.
it could also be your antenna, or feeders, but that’s quite a rare problem.