5G Radio Access Technology Kumar Balachandran Principal Research Engineer Ericsson Research
5G Wireless Access A wide range of requirements and capabilities More than just enhanced mobile broadband • Very high traffic capacity • High data rates everywhere • Very low latency • Ultra-high reliability and availability • Massive number of devices • Very low device cost and energy consumption Connectivity anywhere and anytime for anyone and anything • Very high network energy performance • ... Flexibility for new applications and usage cases 5G Radio Access | Public | IEEE 5G Summit, Seattle| 2016-11-05 | Page 2 5G Radio Access | Public | IEEE 5G Summit Seattle | 2016-11-05 | Page 2
5G Radio Access Evolution of existing technology + New radio-access technology Tight interworking NR Evolution of LTE Enhanced Multi-antenna Latency V2X LAA 1 enhancements reductions MTC 5G Radio Access | Public | IEEE 5G Summit, Seattle| 2016-11-05 | Page 3 5G Radio Access | Public | IEEE 5G Summit Seattle | 2016-11-05 | Page 3
NR – 3GPP timeplan 2013 2014 2015 2016 2017 2018 2019 2020 2021 Specs Vision, feasibility Requirements Proposals Requirements Specifications Rel-13 Rel-14 Rel-15 Rel-16 Rel-17 5G SI(s) NR Phase2 NR Phase1 Acceleration 5G Radio Access | Public | IEEE 5G Summit Seattle | 2016-11-05 | Page 4
NR – Key technology features Extension to Ultra-lean design higher frequency bands 4G Minimize network transmissions 5G not directly related to user data delivery 1 GHz 3 GHz 10 GHz 30 GHz 100 GHz Direct Access/backhaul device-to-device integration connectivity Massive antenna Multi-site configurations connectivity/coordination OFDM-based physical layer 5G Radio Access | Public | IEEE 5G Summit, Seattle| 2016-11-05 | Page 5 5G Radio Access | Public | IEEE 5G Summit Seattle | 2016-11-05 | Page 5
Duplex arrangement › Lower frequencies: Mainly FDD – Co-existence with existing deployments – Avoid TDD-specific interference › Higher frequencies: Mainly TDD – Easier to find unpaired spectrum supporting very wide transmission bandwidth – Higher degree of channel reciprocity Additional beam-forming possibilities – Enabling dynamic assignment of downlink/uplink resources 5G Radio Access | Public | IEEE 5G Summit, Seattle| 2016-11-05 | Page 6 5G Radio Access | Public | IEEE 5G Summit Seattle | 2016-11-05 | Page 6
Multi-antenna transmission NR › Lower frequencies: – Similar antenna configurations as LTE – Bandwidth limited Spatial multiplexing (data rates) and multi-user MIMO (capacity) more important – Evolution/refinement of LTE multi-antenna transmission › Higher frequencies: – Very large number of controllable antenna elements – Typically plenty of bandwidth Beam-forming for coverage more important – Need coverage for all transmissions, including control, system information, random access, …. – Mobility between beams rather than between cells – Also beam-forming at the device side 5G Radio Access | Public | IEEE 5G Summit, Seattle| 2016-11-05 | Page 7 Page 7
Radio Network Evaluations 5G Radio Access | Public | IEEE 5G Summit, Seattle| 2016-11-05 | Page 8
Assumptions › LTE and NR using the same sites › Over-the-roof-top deployment – ISD = 235 m or ISD = 127 m › Only outdoor users LTE – 20MHz FDD – 4x4 MIMO Peak rate ~400 Mbps NR – 200MHz TDD at 28GHz – 2x4 SU-MIMO, 90% DL Peak rate ~1.4 Gbps – Total of 32 BS antennas 5G Radio Access | Public | IEEE 5G Summit Seattle | 2016-11-05 | Page 9
Downlink peak Throughput Limited throughput in some Close to peak throughput in outdoor areas most outdoor areas 5G Radio Access | Public | IEEE 5G Summit Seattle | 2016-11-05 | Page 10
Gains from interworking Interworking improves achievable throughput 5G Radio Access | Public | IEEE 5G Summit Seattle | 2016-11-05 | Page 11
Summary › NR offers a new air interface for 5G operation in all IMT bands – New frame structure – Better support for large antenna arrays than LTE – Lean design with self-contained frame › System evaluations highlight the need for new spectrum – Denser networks are needed for good standalone operation – Operation at higher bands (e.g. at 28 GHz ) benefits from coverage in lower bands (<6 GHz) – Good quality of experience will need wider system bandwidth for coverage bands 5G Radio Access | Public | IEEE 5G Summit, Seattle| 2016-11-05 | Page 12 5G Radio Access | Public | IEEE 5G Summit Seattle | 2016-11-05 | Page 12
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