Signal Processing for 5G: Algorithms and Implementations

Chapter 20Ultra Dense Networks: General Introduction and Design Overview

Jianchi Zhu, Xiaoming She and Peng Chen

1. 20.1 Introduction
   1. 20.1.1 Application Scenarios
   2. 20.1.2 Challenges
   3. 20.1.3 Key Technologies
2. 20.2 Interference Management
   1. 20.2.1 Network Coordination
   2. 20.2.2 Advanced Receivers
3. 20.3 Mobility Management
   1. 20.3.1 Dual Connectivity
   2. 20.3.2 Virtual Cell
   3. 20.3.3 Virtual Layer
   4. 20.3.4 Mobility Anchor
   5. 20.3.5 Handover Command Diversity
4. 20.4 Architecture and Backhaul
5. 20.5 Other Issues in UDNs for 5G
6. 20.6 Conclusions
7. Acknowledgements
8. References

20.1 Introduction

The evolution of 3G into 4G is driven by the creation and development of new services for mobile devices, and is enabled by advancement of the technology available for mobile communication systems. Mobile communication has experienced explosive growth over the past decade, fueled by the popularity of smart phones and tablets, the number of which almost doubles every year. According to the Cisco Visual Networking Index [1], mobile data traffic volume is expected to grow at a compound annual growth rate of 61% from 2013 through 2018. Furthermore, a broad consensus in the wireless industry anticipates a continuation of this trend for several years to come. It is predicted that data traffic volume will reach 1000 times its 2010 value by 2020, referred to as the 1000× data challenge [2]. The main factors accounting for the significant growth in mobile data traffic are the emergence of mobile internet applications and the proliferation ...