IEEE 5G Tech Focus
Volume 1, Number 1, March 2017

In This Issue

Message from the Founding Editorial Board

IEEE 5G Tech Focus is a multidisciplinary online journal. It is sponsored by the IEEE Future Directions 5G Initiative, which includes researchers, scientists, and engineers from industry, academia, and governments around the world working together to meet the challenges associated with the development and deployment of 5G. It will publish timely short articles on original research or development and brief tutorials in areas related to 5G technologies. IEEE 5G Tech Focus is designed to bring clarity to global 5G R&D efforts and foster collaboration among the diverse stakeholders by providing high-impact and relevant editorial content from the world's subject matter experts on timely 5G issues and deployments.

As you can see from the inaugural issue, IEEE 5G Tech Focus publishes short articles of different styles, range from cutting edge theories and techniques, to advanced prototyping and trial results in broad scope, from 5G related devices, systems, to potential applications of 5G networks. In short, everything related to 5G!

IEEE 5G Tech Focus is currently published quarterly and will gradually shift into bi-monthly. A journal cannot succeed without support from authors and readers. We warmly welcome authors for their submissions and readers for their feedback on the journal.

Founding Editorial Board of the IEEE 5G Tech Focus

Geoffrey Li, Editor-in-Chief
Amine Maaref, Managing Editor
Siming Zhang, Assoc. Managing Editor
Chih-Lin I
Paul Nikolich
James Irvine

5G Channel Model with Improved Accuracy and Efficiency in mmWave Bands

By Theodore S. Rappaport, Shu Sun, and Mansoor Shafi

This article compares two popular channel models for 5G wireless communications, the 3GPP TR 38.900 Release 14 and NYUSIM channel models. Simulation results indicate that the 3GPP channel model yields unrealistic eigenvalues and higher spectral efficiency than NYUSIM, revealing the problematic choice of some channel parameters in the 3GPP model for frequencies above 6 GHz.

Massive MIMO for 5G

By Erik G. Larsson and Liesbet Van der Perre

Massive MIMO is the currently most compelling sub-6 GHz physical-layer technology for future wireless access. The main concept is to use large antenna arrays at base stations to simultaneously serve many autonomous terminals, as illustrated in Figure 1. The rich and unique propagation signatures of the terminals are exploited with smart processing at the array to achieve superior capacity. Massive MIMO splendidly offers two most desirable benefits.

Ultra-Dense Networks (UDNs) for 5G

By Jialing Liu, Weimin Xiao, Chih-Lin I, Chenyang Yang, Anthony Soong

This article gives an overview of the current state of UDN development and issues related to 5G RAN.

Since the beginning of mobile industry, cell splitting and densification has been one of the most effective means to deliver ever-increasing capacity and improving user experience. In recent years, UDN has emerged as a prominent solution to meet the challenges of fulfilling IMT-2020 (5G) extremely high capacity density requirements of up to 10 Mbps/m². Qualitatively, UDN is a network with much higher density of radio resources than that in current networks, i.e., much denser small cell network in terms of either relative density or absolute density of the BSs. Quantitatively, the definition of UDN varies among the literature. In [1-4], UDN is defined as a network where the BS (or AP) density potentially reaches or even exceeds the user density, which is appropriate to characterize the scenario when the traffic per user increases while the number of users does not. In [5], an UDN is characterized as a network where the inter-site distance is only a few meters. In [6], UDN is identified as a network reaching the point where its capacity grows sub-linearly, due to the growing impact of interference, as the BS density increases.

Towards 5G Network Slicing - Motivations and Challenges

By Prof. Alex Galis and Dr. Chih-Lin I

This paper introduces the motivation for and the challenges of Network Slicing in the context of 5G Networks.

5G networks are conceived as extremely flexible and highly programmable end-to-end connect-and-compute infrastructures that are both application- and service-aware, as well as being time-, location-, and context-aware.

These 5G networks represent:

A revolution, over 4G networks, in terms of capacity, performance, and spectrum access in radio network segments; as well as
A revolution of native flexibility and programmability conversion in all radio and non-radio 5G network segments: Radio Access Network, Fronthaul and Backhaul Networks, Access Networks, Aggregation Networks, Core Networks, Mobile Edge Networks, Software Networks, Software-Defined Cloud Networks, Satellite Networks and Edge IoT Networks.

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IEEE 5G Tech FocusVolume 1, Number 1, March 2017