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5G – Ultra-Reliable Wireless Technology with Low Latency
János Farkas, Torsten Dudda, Alexey Shapin, and Sara [email protected] , [email protected] , [email protected] , [email protected]
Ericsson Research 2020-03-24Reliable and Available Wireless (RAW) WG, IETF 107
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J. Farkas, T. Dudda, A. Shapin, S. Sandberg | 2020-03-24 | 5G - Ultra-Reliable Wireless Technology with Low Latency | Page 2
Outline
— 5G URLLC use cases & overview
— 5G NR low-latency features
— 5G NR reliability features
— 5G multi-connectivity features
— Integration of 5G and TSN
— 5G and DetNet combinations
— Summary
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J. Farkas, T. Dudda, A. Shapin, S. Sandberg | 2020-03-24 | 5G - Ultra-Reliable Wireless Technology with Low Latency | Page 3
Industrial Use Cases and Requirements
Source: 5G-ACIA: White Paper, “5G for Connected Industries and Automation,” Feb. 2019
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J. Farkas, T. Dudda, A. Shapin, S. Sandberg | 2020-03-24 | 5G - Ultra-Reliable Wireless Technology with Low Latency | Page 4
5G URLLC Overview
5G
Enhanced mobile broadband
Ultra-Reliable and Low-Latency
Communication(URLLC)
Massive machine-type
communication
Timesynchronization
Low latency
Reliability
Resource management5GURLLC gNB
UE
UL schedulingrequest (SR)
UL grant UL
transmission
Skip SR-to-grant delay
NR slot = 14 OFDM symbols
Mini-slot
5G System
5G ultra-reliable and low-latency communication
Latency
Pro
babi
lity
Bou
nd
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J. Farkas, T. Dudda, A. Shapin, S. Sandberg | 2020-03-24 | 5G - Ultra-Reliable Wireless Technology with Low Latency | Page 5
5G NR – Scheduled Wireless Access
Dynamic DL & UL resource assignments
— gNB schedules radio resources according to availability and QoS
— primarily licensed spectrum
Admission control
— QoS of existing users ensured by admission control of further users
Quality of Service (QoS)
— QoS flows established through core and radio network
— Packet delay budget, priority, packet error rate
STOP!
5G
NRUser #1 scheduledUser #2 scheduled
Time-frequency fading, user #1
Time-frequency fading, user #2
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J. Farkas, T. Dudda, A. Shapin, S. Sandberg | 2020-03-24 | 5G - Ultra-Reliable Wireless Technology with Low Latency | Page 6
5G NR – Low-latency Features
Numerology & mini-slotμ SCS [kHz] Slot duration0 15 1 ms1 30 0.5 ms2 60 0.25 ms3 120 0.125 ms4 240 0.0625 ms
μ=0
Time
Freq
.
Min
i-slo
t
NR slot
μ=2
μ=1
Pre-scheduling
gNB
UE
UL scheduligrequest (SR)
UL grant UL transmission
Skip SR-to-grant delay
Fast processing & re-tx (HARQ)
DL DataDC
I
UL DataK0
K2
K1
DLACK
The fastest case is K0 = K1 = K2 = 0 slots
Pre-emption
eMBB eMBB
UR
LLC
Pre-emptionindication
Repair transmission
Applicable to both IP and Ethernet PDU sessions
Multiple Control channel monitoring occasions within one slot is supported
slot
CTRL
CTRL
CTRL
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J. Farkas, T. Dudda, A. Shapin, S. Sandberg | 2020-03-24 | 5G - Ultra-Reliable Wireless Technology with Low Latency | Page 7
5G NR – Reliability Features
Robust control and datachannels— Extra-robust modulation
and coding schemes— Robust control channel
design— Channel state reporting and
centralized link adaptation
Multi-antenna techniques
— Exploit diversity and increased channel quality of multiple antennas at transmitter and receiver
Multi-connectivity
— Multiple duplicate transmissions on different carriers
— More on next slide ...
Applicable to both IP and Ethernet PDU sessions
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J. Farkas, T. Dudda, A. Shapin, S. Sandberg | 2020-03-24 | 5G - Ultra-Reliable Wireless Technology with Low Latency | Page 8
5G – Multi-connectivity Features
UE
DeviceTx/Rx
Tx/Rx
HPREOF/FRER
Dual Connectivity
MgNB
SgNBUE
Dual UEs in the Device
UE
DeviceTx/Rx
Tx/Rx
HPREOF/FRER
gNB1
gNB2
DevicegNBUE
PDCP
L2low
L1
L2low
L1
L2low
L1
L2low
L1
PDCP
Carrier 1Carrier 2
RAN internal: PDCP duplication
UPF1
UPF2
UPF1
UPF2
— Full redundancy of UE and network
— Network user plane redundancy
— Redundant over-the-air transmissions
— 5G is ready for DetNet service protection:
— PREOF: Packet Replication, Elimination, and Ordering Functions, see RFC 8655 DetNet Architecture
— FRER: Frame Replication and Elimination for Reliability, see IEEE Std 802.1CB
Applicable to both IP and Ethernet PDU sessions
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J. Farkas, T. Dudda, A. Shapin, S. Sandberg | 2020-03-24 | 5G - Ultra-Reliable Wireless Technology with Low Latency | Page 9
5G as Virtual Bridge for TSN Integration
5G System
Virtual TSN Bridge
Virtual TSN Bridge
SDN Controller
Endstation
Central NetworkControl (CNC)
Endstation
Central UserControl (CUC)
PCF
TSN AF
gNB UPFUE
IO device(sensor/actuator)
Controller
CUC control CUC control
NETCONF/RESTCONF
End-to-end Ethernet
gNB UPFUETSNbridge
TSNbridge
TSNbridge
TSNbridge
FRE
R
FRE
R
TT
TT TT
TT
PDU Session 1
PDU Session 2
TSN FRER
5G control plane5G user plane
TSN Translator (TT)for Interworking
deterministic latency IEC/IEEE 60802 TSN for IA
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J. Farkas, T. Dudda, A. Shapin, S. Sandberg | 2020-03-24 | 5G - Ultra-Reliable Wireless Technology with Low Latency | Page 10
5G Matches Deterministic Wireline Networking
Timesynchronization
Low latency
Reliability
Resource management5GURLLC gNB
UE
UL schedulingrequest (SR)
UL grant UL
transmission
Skip SR-to-grant delay
NR slot = 14 OFDM symbols
Mini-slot
5G System
5G ultra-reliable and low-latency communication
Latency
Pro
babi
lity
Bou
nd
match
Resource management
Time sync(provided by lower layerfor DetNet)
Reliability
Bounded low latency DetNet/TSN
Guaranteed delivery in aguaranteed time window
Latency
Pro
babi
lity
Bou
nd
Network Controller
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J. Farkas, T. Dudda, A. Shapin, S. Sandberg | 2020-03-24 | 5G - Ultra-Reliable Wireless Technology with Low Latency | Page 11
5G and DetNet Combination Examples
a) TSN was considered as first sub-network technology candidate for DetNet, but more to come …
DetNet
TSN
b) 5G acting as a sub-network for DetNet
DetNet
5G
c) 5G & TSN sub-networks for DetNet
DetNet
5G
I-D.ietf-detnet-ip-over-tsnI-D.ietf-detnet-mpls-over-tsn
TSN
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J. Farkas, T. Dudda, A. Shapin, S. Sandberg | 2020-03-24 | 5G - Ultra-Reliable Wireless Technology with Low Latency | Page 12
Summary
— 5G provides centrally controlled scheduled wireless segments with high reliability and availability— Dynamic and pre-scheduled DL & UL resource assignment — Admission control to ensure QoS
— 5G provides QoS guarantees for latency and reliability— latency below 1ms with reliability up to 99.999%
— 5G contains several features to achieve ultra-reliable and low latency performance, e.g.,: — support for different OFDM numerologies and slot-durations— fast processing capabilities— redundancy techniques
— 5G includes features to support Industrial IoT— 5G supports integration with TSN
— Reliability equally applicable to DetNet— 5G is DetNet ready
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J. Farkas, T. Dudda, A. Shapin, S. Sandberg | 2020-03-24 | 5G - Ultra-Reliable Wireless Technology with Low Latency | Page 13
Thank you!
Q&A