Date Added: Oct 2011
Of the numerous performance metrics applied to cellular telephone systems, probably none is more important for customer satisfaction than the system drop call rate. Customers are more sensitive to call dropping than to call blocking at initiation. Proper system design and operation involve keeping the drop call rate as low as possible. Call/packet dropping refers to the event described as the termination of calls in progress before either involved party intentionally ends the call. There are numerous drop call causes in cellular networks with majority of them occurring in the Um interfaces mainly due to lack of radio resources created by electromagnetic causes and user mobility (i.e. handover).