Under the background of the great development of 4G network

VoLTE technology as a means of providing high-definition voice solutions has been highly valued by operators. However

VoLTE technology protocol is very complex

involving many network element interfaces

and it is difficult to maintain and optimize. This paper summarizes the methodology by studying the optimization of VoLTE service performance indicators such as connection rate and connection time

which provides ideas and experience for the follow-up optimization of VoLTE network.