5g radio access for networked society - ieee 5g summit · janne peisa, principal researcher ieee 5g...
TRANSCRIPT
Public | © Ericsson AB 2015 | 2015-08-18 | Page 2
› 5G use cases
› Massive and critical communications
› 5G radio access
› Techniques for critical communication
– Low latency
– Reliability
Outline
© Telefonaktiebolaget LM Ericsson | January 2017
Public | © Ericsson AB 2015 | 2015-08-18 | Page 3
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
???
© Telefonaktiebolaget LM Ericsson | January 2017
Public | © Ericsson AB 2015 | 2015-08-18 | Page 4
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
© Telefonaktiebolaget LM Ericsson | January 2017
Public | © Ericsson AB 2015 | 2015-08-18 | Page 5
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
© Telefonaktiebolaget LM Ericsson | January 2017
Public | © Ericsson AB 2015 | 2015-08-18 | Page 6
NR – selected design targets
Beam centric
Multi-connectivity
Ultra-lean
Minimize network transmissions
not directly related to user-data delivery
© Telefonaktiebolaget LM Ericsson | January 2017
Forward compatibility
Low latency
Multi-service
One slot
Mini-slot
Network Slices
Public | © Ericsson AB 2015 | 2015-08-18 | Page 7
› 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
Public | © Ericsson AB 2015 | 2015-08-18 | Page 8
› 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
Public | © Ericsson AB 2015 | 2015-08-18 | Page 9
-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
Public | © Ericsson AB 2015 | 2015-08-18 | Page 10
› 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
Public | © Ericsson AB 2015 | 2015-08-18 | Page 11
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
› …
Public | © Ericsson AB 2015 | 2015-08-18 | Page 12
› 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