With the commercialization of VoLTE services and the large scale increase of 4G users

4G networks not only undertake data services but also voice services

which puts forward higher requirements for uplink quality.With the increasing complexity of network structure and wireless environment

LTE link quality restricts the performance of LTE network to a great extent.The degree of interference

coverage

or capacity limitation of the LTE network directly affects the actual perception of users such as call quality

upload and download rates

and time delay

and also causes a series of problems such as failure to connect

drop calls and handover failure.In this paper

the power margin value PH is used to characterize the uplink quality of LTE

and the uplink performance parameters are mined and adjusted to quickly improve the uplink quality.Combined with the practical problems of top cells with low power margin in core urban area

this paper explores the main reasons for the high proportion of low PHR cells and proposes a set of parameter optimization scheme different from the traditional optimization method

so as to reduce the proportion of low PHR cells and improve the uplink quality.Through pilot verification

it can be seen that the proportion of cells with low PHR problems in the core urban area has been reduced from 3.94% to 1.48%.