Bassam, it’s just impossible to have 100% congestion or more.
100% congestion means that there is absolutely no traffic that is carried : all the traffic is rejected.
More than 100% means that there is actually more traffic rejected than required. Not possible in our sad little world. 🙂
An extremely congested cell would have around 60% TCH “call setup” congestion rate, at most… (in my experience)