Signal Processing for 5G: Algorithms and Implementations

Chapter 21Radio-resource Management and Optimization in 5G Networks

Antonis Gotsis, Athanasios Panagopoulos, Stelios Stefanatos and Angeliki Alexiou

1. 21.1 Introduction
2. 21.2 Background
   1. 21.2.1 Radio-resource Management Challenges
   2. 21.2.2 Optimization Tools applied to Centralized Radio-resource Management
3. 21.3 Optimal Strategies for Single-antenna Coordinated Ultradense Networks
   1. 21.3.1 System Model and Scope
   2. 21.3.2 User Association and Scheduling
   3. 21.3.3 User Association, Scheduling and Power Allocation
   4. 21.3.4 Numerical Results
4. 21.4 Optimal Strategies for Multi-antenna Coordinated and Cooperative Ultradense Networks
   1. 21.4.1 System Model and Scope
   2. 21.4.2 Precoder Design for given User Association
   3. 21.4.3 Joint Precoder Design and User Association for Constrained Backhaul
   4. 21.4.4 Numerical Results
5. 21.5 Summary and Future Research Directions
6. Acknowledgments
7. References

21.1 Introduction

The introduction of previous cellular generations (2G to 4G) was marked by advances in link spectral efficiency (coding, MIMO) and user multiplexing (CDMA, OFDMA, SDMA). The 5G wireless network is expected to efficiently exploit new technologies, infrastructures and user devices, providing a transparent massive connectivity framework [1]. The main enablers of this approach will be the availability of hyperdense deployments of access/serving points and the exploitation of communications proximity. In this sense, ultradense networks (UDNs) are considered a cornerstone of 5G network evolution [2–6], building ...