With the reduction of network resource

network optimization has been developing towards precision since 2018. How to find the critical moment when users can not use 4 G network

accurate network expansion and optimization

putting limited network resources into areas with more business needs has become a key topic. This paper defines the 4 G network black spot user from the 4 G user’s network attachment behavior

uses the 4 G network black spot user’s resident 2 G cell

focuses on the 4 G weak coverage area

establishes the network 4 G weak coverage black spot recognition model based on the user behavior

and has been used in the latest phase of mobile FDD expansion project in the second half of 2019

and has obtained good application effect.