"Definition of Call Setup Success Rate," the call setup success rate involves the RRC connection setup success rate and E-RAB establishment success rate. The analysis methods of problems related to the two rates are as follows:
First analyze the original traffic statistics to check whether the call setup success rate meets the requirement. If it does not, check whether the problem is caused by improper basic configurations, such as the NE configuration, cell status, and interference from the environment. If basic configurations are proper, locate causes for top cells using traffic statistics or by tracing signaling. The following figure shows the analysis and optimization procedure for the success rate.
