Emerging technologies bring not only better performance

but also greater power consumption. Meanwhile

the user equipment presents the characteristics of miniaturization and portability

which makes it impossible for it to carry large capacity battery. This will result in the poor battery life of the user equipment

and eventually have a negative impact on the user experience. Thus

as an energy saving mechanism

discontinuous reception received much attention in the recent standardization process. Many organizations and institutions put forward ideas and schemes to improve it. This paper gives a brief introduction and analysis to the DRX mechanism and corresponding promotion schemes.