As an evolution scheme to solve the voice technology in LTE

VoLTE makes it possible to carry both voice and data service in area covered with LTE. However

in LTE blind coverage area

the voice service is still carried in 2G/3G network

and e SRVCC handover from LTE to 2G/3G must be supported. The eSRVCC handover process involved many units in LTE and GSM network

and the signaling interaction is complicated. Moreover

the user’s experience is affected much by the different types of phone

different home PLMN

and different scenes. So this article conclude a set of ways by optimization experience

about how to locate the issues

and solve them to improve the successful rate of e SRVCC handover.