5g radio access technology - ieee 5g summit · 5g radio access technology kumar balachandran...

5G Radio Access Technology

Kumar BalachandranPrincipal Research EngineerEricsson Research

5G Radio Access | Public | IEEE 5G Summit Seattle | 2016-11-05 |

• 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

• Very high network energy performance

• ...

5G Wireless Access

More than just enhanced mobile broadband

Connectivity anywhere and anytime for anyone and anything

Flexibility for new applications and usage cases

A wide range of requirements and capabilities

5G Radio Access | Public | IEEE 5G Summit, Seattle| 2016-11-05 | Page 2


5G Radio Access

NRTight

interworkingEvolution of LTE

Evolution of existing technology + New radio-access technology


1Latency

reductionsLAAMulti-antennaenhancements

Enhanced MTC

V2X


Proposals

Rel-14

NR – 3GPP timeplan2013 2014 2015 2016 2017 2018 2019 2020 2021

Rel-13 Rel-15 Rel-16

5G SI(s)

Rel-17

Requirements Specifications

Vision, feasibility Requirements Specs

NR Phase1 NR Phase2

Acceleration


NR – Key technology features

Access/backhaulintegration

Direct

device-to-deviceconnectivity

Massive antennaconfigurations

Ultra-lean designExtension to higher frequency bands

Multi-site connectivity/coordinationOFDM-based

physical layer

Minimize network transmissions not directly related to user data delivery

1 GHz 3 GHz 10 GHz 30 GHz 100 GHz

4G

5G



› 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

Duplex arrangement


› 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

Multi-antenna transmissionNR


5G Radio Access | Public | IEEE 5G Summit, Seattle| 2016-11-05 |

Radio Network Evaluations


Assumptions

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

› LTE and NR using the same sites

› Over-the-roof-top deployment– ISD = 235 m or ISD = 127 m

› Only outdoor users


Downlink peak Throughput

Limited throughput in some outdoor areas

Close to peak throughput in most outdoor areas


Gains from interworking

Interworking improves achievable throughput

5G Radio Access | Public | IEEE 5G Summit Seattle | 2016-11-05 | 5G Radio Access | Public | IEEE 5G Summit, Seattle| 2016-11-05 | Page 12

› 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

Summary

5g radio access technology - ieee 5g summit · 5g radio access technology kumar balachandran...

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