۱٫ Introduction

۲٫ Background and Related Technologies

۳٫ Recent Achievements

۴٫ Open Problems

۵٫ Conclusions

Acknowledgement

References

The exponential growth and availability of data is the main driving force to the continuing evolution in the communication industry. The mobile video traffic is the main component of the immense amount of traffic generated by smart devices and requires a paradigm shift in all aspects of mobile network. Ultra-dense network (UDN) is one of the leading ideas where the access nodes and the communication links per unit area are densified. In this paper, we provide an introduction of UDN and video services. The relative techniques are summarized as well as the recent finding. Finally, we discuss the problems to the researchers in the field of video application in UDN.

Introduction

According to the global mobile data traffic report of the newest Cisco Visual Networking Index, the global mobile data traffic was 400 petabytes per month in 2011, and it had reached 7.2 exabytes per month at the end of 2016, while it is forecasted to reach 49.0 exabytes per month by 2021. Which means that, the mobile data traffic had grown 18-fold from the past five years, and will increase 7-fold in the next five years1 . With the increasing popularity of smart devices, user-oriented mobile multimedia services, such as e-healthcare, video conference, video surveillance, and online gaming, especially for the high resolution (HD) video and ultra-high resolution (UHD) video with high quality requirement are rising rapidly, which led directly to the mobile data traffic provided by smart devices for a dominant position. As of the end of 2016, smart devices accounted for 46 percent of the total mobile devices and the 89 percent of the mobile data traffic was generated by these smart devices.