5g - ultra-reliable wireless technology with low latency

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

mailto:[email protected]




J. Farkas, T. Dudda, A. Shapin, S. Sandberg | 2020-03-24 | 5G - Ultra-Reliable Wireless Technology with Low Latency |

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


Industrial Use Cases and Requirements

Source: 5G-ACIA: White Paper, “5G for Connected Industries and Automation,” Feb. 2019

https://www.5g-acia.org/publications/5g-for-connected-industries-and-automation-white-paper/


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


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


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


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


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 ...



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



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

https://1.ieee802.org/tsn/iec-ieee-60802/

https://www.ericsson.com/en/ericsson-technology-review/archive/2019/5g-tsn-integration-for-industrial-automation?utm_source=twitter&utm_medium=social_organic&utm_campaign=bnew_global_etr_20190827&utm_content=5g_tsn_integration


5G Matches Deterministic Wireline Networking

Timesynchronization

Low latency

Reliability

Resource management5GURLLC gNB

UE

UL schedulingrequest (SR)

UL grant UL

transmission


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


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

https://datatracker.ietf.org/doc/draft-ietf-detnet-ip-over-tsn/

https://datatracker.ietf.org/doc/draft-ietf-detnet-mpls-over-tsn/


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


Thank you!

Q&A

5g - ultra-reliable wireless technology with low latency

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