0 SK Telecom Proprietary 2018 SK Telecom Mobile Network History and leading mobile network evolution to 5G 5G

~10Gbps

LTE-A Pro 1Gbps LTE-A Pro 700~900M bps 900Mbps

2CC 4x4 LTE-A 500Mbps 256QAM 800MHz LTE-A 3CC CA (50MHz) LTE-A 300Mbps 28GHz 225Mbps or LTE-A 700Mbps 3CC 4x4 100MHz 150Mbps 256QAM 256QAM 256QAM Bandwidth /LTE Multi- 2CC CA 2CC CA 3CC CA 3CC CA 5CC CA 3CC CA (50MHz) 3.5GHz WCDMA/HSDPA 75Mbps Carrier (20MHz) (30MHz) (40MHz) (40MHz) (70MHz) CDMA1x & EVDO

1996~2002 2006 2011.7 2012.7 2013.6 2014.6 2014.12 2016.6 2017.6 2018.1H 2019~

World’s First Korea’s First World’s First World’s First World’s First World’s First World’s First World’s First 1 SK Telecom Proprietary 2018 5G Commercialization and Services 5G Commercialization will be initiated in 2019 1Q

2017 2018 2019 2020

‘17.3 ‘18.6 ‘19.12 Release 15 Release 16 Release 17

3GPP 5G SI 5G NR WI Phases 1 5G NR WI Phases 2 5G standard 5G Commercialization ‘17.12 ‘18.6 ‘18.12 ‘19.12 (tentative)

R15 early-drop 5G phase 1 (SA) R15 late-drop 5G phase 2 completion completion completion completion (NSA)

5G Commercial Service (with 3GPP compliant infra/device)

Smart Factory Virtual Education Remote Surgery Autonomous Driving

2 SK Telecom Proprietary 2018 Beyond 5G Technologies Requirement for Telecom Operators The goal is to provide innovative services with less investment

Source : Forbes Customer’s satisfaction 5G service may be expensive

Beyond 5G Technology Requirement

1. Cost effective with better performance 2. Innovative Services

3 SK Telecom Proprietary 2018 Fiber Optics to The last wired network needs to be replaced with wireless networks with tera bps

Internet

Expensive for rent, construction, and management

First version to wireless FWA (Fixed Wireless Access)

Multi-10G Fronthaul/backhaul networks  Wireless terabit networks

Source:

4 SK Telecom Proprietary 2018 Terahertz Band Communications Terahertz band communications will play a key role for substitute for fiber optics 【 Characteristics and challenges】

• Broad bandwidth • Very small antenna • Power consumption (DAC/ADC, RF/PHY) • Short coverage

【 Terahertz Network Architecture 】

Terahertz Terahertz Terahertz

Data Center

NR (<6GHz) NR (>6GHz)

5 SK Telecom Proprietary 2018 Cell-based to Cell-free Network Architecture Cell-free network allows to maximize network performance with less investment

Less Investment & Better Performance

Cell-based Network Cell-free Network • Inter-cell interference at cell edge • Low interference due to user centric coverage • Same investment for areas with a few mobile users • Less investment using cooperative beamforming

6 SK Telecom Proprietary 2018 Massive MIMO and RAN Virtualization for Cell-free Network Fully virtualized RAN with Massive MIMO supports cell-free network

Cloud RAN E2E Control

Virtualized Virtualized N/W functions N/W functions

Massive MIMO

Data Center

• Base station with only antenna and RF • Flexibility for rollout • Maximizing network performance • Cost-effective network configuration

7 SK Telecom Proprietary 2018 5G V2X for Autonomous Driving V2X using 5G RANs is currently being standardized for autonomous driving

5G V2X

Mission  Low latency Critical Service  high reliability  Realtime processing V2X  Big data transmission

IoT

HUD/ AR ITS V2X Map ADAS Sensor

8 SK Telecom Proprietary 2018 Non-Terrestrial Networks for Autonomous Flight/Voyage NTNsNon-Terrestrial Networks with extremely broad coverage are essential for autonomous flight in the sky and autonomous voyage at sea in the future

【 Characteristics 】

 Broad coverage  Long latency  Low Capacity (~100Mbps)

9 SK Telecom Proprietary 2018 Evolution of Non-Terrestrial Networks Ultra-high throughput NTNs with low latency become a fundamental technology in the future where everything moves freely on its own

Source: Fraunhofer

Delay Requirement ~10msec

Source: 3GPP

10 SK Telecom Proprietary 2018 Enabling Technologies for Future Networks

1. Terabit Communications with Tera Hertz Waves

2. Full RAN Virtualization with Massive MIMO for Cell-free Networks

3. Ultra-high Throughput Non-Terrestrial Networks with Low Latency for Autonomous Flight/Voyage

11 SK Telecom Proprietary 2018 12 SK Telecom Proprietary 2018