Ultra-Dense Networks for 5G and Beyond

12Cooperative Video Streaming in Ultra‐dense Networks with D2D Caching

Nguyen‐Son Vo¹ and Trung Q. Duong²

¹Institute of Fundamental and Applied Sciences, Duy Tan University, Vietnam

²School of Electronics, Electrical Engineering and Computer Science, Queen's University Belfast, UK

12.1 Introduction

The world has been in a new era of industry, namely the fourth industrial revolution, where by 2020 there will be about 50 billion connected devices communicating with each other in the context of the Internet of Things [1]. In this context, 5G networks will be facing the challenge of a massive number of mobile users (MUs) requesting an explosive amount of traffic. In other words, this may cause 5G networks to be degraded due to the traffic congestion problem in the backhaul links of macro base stations (MBSs). Though ultra‐dense networks (UDNs) hold considerable promise as a new architecture innovation to meet the requirements of 5G networks, e.g. a thousand‐fold system capacity and less than one millisecond end‐to‐end latency [2], the development of UDNs requires more disruptive techniques and optimization designs that can provide the surge in MUs with high data rate services, e.g. video streaming services (VSSs), at high quality of experience (QoE) and high resource saving.

To cope with the challenge, many techniques and optimization designs for UDNs have been focusing on how to efficiently utilize the spatial, spectrum, bandwidth, and energy resources as well as how to bring the ...