5G Radio Access Technology

Transcription

1 5G Radio Access Technology Kumar Balachandran Principal Research Engineer Ericsson Research

2 5G Wireless Access More than just enhanced mobile broadband A wide range of requirements and capabilities 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 Page 2 5G Radio Access Public IEEE 5G Summit Seattle Page 2

3 5G Radio Access Evolution of existing technology + New radio-access technology Evolution of LTE Tight interworking NR Multi-antenna enhancements LAA 1 Latency reductions Enhanced MTC V2X 5G Radio Access Public IEEE 5G Summit, Seattle Page 3 5G Radio Access Public IEEE 5G Summit Seattle Page 3

4 NR 3GPP timeplan Vision, feasibility Requirements Proposals Specs Requirements Specifications Rel-13 Rel-14 Rel-15 Rel-16 Rel-17 5G SI(s) NR Phase1 NR Phase2 Acceleration 5G Radio Access Public IEEE 5G Summit Seattle Page 4

5 NR Key technology features Extension to higher frequency bands 4G 5G Ultra-lean design Minimize network transmissions not directly related to user data delivery 1 GHz 3 GHz 10 GHz 30 GHz 100 GHz OFDM-based physical layer Massive antenna configurations Multi-site connectivity/coordination Access/backhaul integration Direct device-to-device connectivity 5G Radio Access Public IEEE 5G Summit, Seattle Page 5 5G Radio Access Public IEEE 5G Summit Seattle Page 5

6 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 Page 6 5G Radio Access Public IEEE 5G Summit Seattle Page 6

7 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 Page 7 Page 7

8 Radio Network Evaluations 5G Radio Access Public IEEE 5G Summit, Seattle Page 8

9 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 Page 9

10 Downlink peak Throughput Limited throughput in some outdoor areas Close to peak throughput in most outdoor areas 5G Radio Access Public IEEE 5G Summit Seattle Page 10

11 Gains from interworking Interworking improves achievable throughput 5G Radio Access Public IEEE 5G Summit Seattle Page 11

12 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 Page 12 5G Radio Access Public IEEE 5G Summit Seattle Page 12

13