5g radio access for networked society - ieee 5g summit · janne peisa, principal researcher ieee 5g...

Janne Peisa, Principal ResearcherIEEE 5G Summit, Lisbon

5G radio access for networked society

Public | © Ericsson AB 2015 | 2015-08-18 |

› 5G use cases

› Massive and critical communications

› 5G radio access

› Techniques for critical communication

– Low latency

– Reliability

Outline

© Telefonaktiebolaget LM Ericsson | January 2017


5G Use Cases

Broadbandexperienceeverywhere

anytime

Smart Transport

Infrastructureand vehicles

Remotecontrolledmachines

Mass market personalizedmedia and

gaming

Human machine

interaction

P

Meters andsensors,

“Massive MTC”

And muchmore

Multiple use-cases supported by a common network platform

???



Wide Range of Requirements

Massive MTC

CAPILLARY NETWORKS

LOW COST, LOW ENERGY

SMALL DATA VOLUMES

MASSIVE NUMBERS

ULTRA RELIABLE

VERY LOW LATENCY

VERY HIGH AVAILABILITY

LOGISTICS, TRACKING AND FLEET MANAGEMENT

SMART

AGRICULTURE

SMART BUILDINGREMOTE HEALTH

CARE

Critical MTC

SMART

METER

TRAFFIC SAFETY & CONTROL

INDUSTRIAL APPLICATION

& CONTROL

REMOTE

MANUFACTURING,

TRAINING, SURGERY



5G Radio Access

Tight

interworkingEvolution

of LTE

Evolution of existing technology + New radio-access technology

NR

(“New Radio”)

Targeting spectrum below 6 GHz Targeting entire 5G spectrum range



NR – selected design targets

Beam centric

Multi-connectivity

Ultra-lean

Minimize network transmissions

not directly related to user-data delivery


Forward compatibility

Low latency

Multi-service

One slot

Mini-slot

Network Slices


› Short scheduling units

– Short regular slots – 125 s at 60 kHz

– “Mini slots” – Arbitrary starting point and length within a slot

› Fast retransmissions

– Two interlaces Retransmission within 250 µs (60 kHz numerology)

– Enabled by front-loaded DMRS/DCI and frequency-first interleaving

allowing for rapid data demodulation/decoding

› Uplink grant-free transmission

– Fast access to channel

– Preferably avoiding explicit time alignment (asynchronous access)

NR – Low latency


› Unlicensed transmissions should follow LBT “rule”

– Do not start transmission until channel is available

– Occupy channel as soon as it is available

› Slot-based scheduling: Dummy transmission until start of slot

› Mini-slot transmission: Rapid occupation of channel with useful data transmission

Mini-slot transmission

Channel available

Dummy TX

Channel available

Slot-based scheduling

Mini-slot transmission

Unlicensed operation


-100 -80 -60 -40 -20 010

-10

10-8

10-6

10-4

10-2

100

Fading Gain (dB)

CD

F

› Diversity may be obtained through

– spatial diversity, and

– frequency diversity

› Time diversity difficult due to latency

constraint

› Coding needed to fully exploit frequency

and transmit diversity

Redundancy through diversity

Diversity is key for ultra-reliable communications

-100 -80 -60 -40 -20 010

-10

10-8

10-6

10-4

10-2

100

Fading Gain (dB)

CD

F

Div Order = 1

Div Order = 2

Div Order = 4

Div Order = 8

Div Order = 16

18 dB

90 dB

Rayleigh fading channel


› Joint connectivity to multiple sites or multiple systems

› Intra-layer connectivity

– Joint transmission/reception: Enhanced coverage

– Distributed MIMO: Higher peak data rates

› Inter-layer connectivity

– Enhanced connectivity robustness

– Intra-RAT or inter-RAT (LTE+NR)

Multi-connectivity

Intra-layerInter-layer


LTE/NR coexistence

Frequency multiplexing

NR overlaid on LTE sCell

NR overlaid on LTE pCell

› NR in LTE MBSFN subframes

› NR unused LTE UL subframes

› …


› 5G designed for new use cases from the beginning

› 5G = LTE evolution + NR

› Key technologies for critical communication include

– Mini-slots for lower latency

– Multi-connectivity for increased reliability

Summary

5g radio access for networked society - ieee 5g summit · janne peisa, principal researcher ieee 5g...

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