R16 NR V2X RAN2 Issues - std-share.itri.org.tw

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R16 NR V2X RAN2 Issues

ICL 周敬淳 / Ching-Chun Chou

[email protected]

109年11月30日


• Part of New Radio (NR)

– Release-15 + Release-16

• 5G: IMT-2020

– Submission to ITU-R by the end of 2019

– 3GPP will submit NR + LTE as the IMT-2020 solution

3GPP Release-16

Slide

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Release-16 Executive Summary• Enhancement of Ultra-Reliable

(UR) Low Latency Communications (URLLC)

• 5GS Enhanced support of Vertical and LAN Services

• Cellular IoT support and evolution

• Advanced V2X support

• 5G Location and PositionningServices

• UE radio capability signalling optimization

• Satellite Access in 5G

• Enablers for Network Automation Architecture for 5G

• Wireless and Wireline Convergence Enhancement

• Mission Critical, Public Warning, Railways and Maritime

• Streaming and TV

• User Identities, Authentication, multi-device

• Slicing

• Other cross-TSG Release 16 Features

• NR-related Release 16 Features

• Release 16 Features impacting both LTE and NR

• LTE-related Release 16 Features

Ref: TS 21.916

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Release-17 in the planning stage

• From the RAN plenary in June, 2019

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Current R16 and R17 Status

• Release-16 ASN.1 freeze by 2020/06

• Release-17 from 2020/01 to 2021/12

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Ref: https://www.3gpp.org/news-events/2118-tsg_sa_87


C-V2X Development in 3GPP

• As an extension of D2D and V2V

– Proximity Service (ProSe)

• Vehicular-to-Anything communication

– Vehicular, Pedestrian, Infrastructure, Network

• Cellular V2X

– 3-phase development

– Including LTE and NR

– Aim for 5G network

V2V

V2P

V2I

Pedestrian

Vehicle

Vehicle

Network

Tx UE

Communication

range

Message

broadcasting

Rx UE

Rx UE

Rx UE

Ref: TR 22.885 & TS 22.185

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C-V2X Phases

• Release-14: LTE based V2X services

– From 2015/08 to 2017/03

• Release-15: 3GPP V2X Phase-2

– From 2017/04 to 2018/06

• Release-16: 5G C-V2X

– From 2018/06 to 2020/06

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Qualcomm’s View on V2X Evolution

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Nokia’s View on MEC and C-V2X

• Short range + Long range communication

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Main Scenario for C-V2X

• Vehicles Platooning

– Leading vehicle forms and control a group

• Advanced Driving

– Automated or semi-auto driving

– Coordination among vehicles

• Extended Sensors

– Sharing information on sensors of nearby cars

– Along with the road side unit (RSU)

• Remote Driving

– High reliability, low latency

– Remote control

Ref: TR 22.886

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Requirement of Scenarios

Max. End-to-End

Latency (ms)Reliability (%)

Data Rate

(Mbps)

Min. Communication

Range (m)

Platooning 10 ~ 25 90 ~ 99.99 50 ~ 65 80 ~ 350

Advanced Driving 3 ~ 100 90 ~ 99.999 10 ~ 53 360 ~ 700

Extended Sensors 3 ~ 100 90 ~ 99.999 10 ~ 1000 50 ~ 1000

Remote Driving 5 99.999 UL: 25 / DL: 1

Ref: TR 22.886

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LTE V2X Use Cases• Forward Collision Warning

• Control Loss Warning

• V2V Use case for emergency vehicle warning

• V2V Emergency Stop Use Case

• Cooperative Adaptive Cruise Control

• V2I Emergency Stop Use Case

• Queue Warning

• Road safety services

• Automated Parking System

• Wrong way driving warning

• V2X message transfer under MNO control

• Pre-crash Sensing Warning

• V2X in areas outside network coverage

• V2X Road safety service via infrastructure

• V2N Traffic Flow Optimisation

• Curve Speed Warning

• Warning to Pedestrian against Pedestrian Collision

• Vulnerable Road User (VRU) Safety

• V2X by UE-type RSU

• V2X Minimum QoS

• Use case for V2X access when roaming

• Pedestrian Road Safety via V2P awareness messages

• Mixed Use Traffic Management

• Enhancing Positional Precision for traffic participants

• Privacy in the V2V communication environment

• V2N Use Case to provide overview to road traffic participants and interested parties

• Remote diagnosis and just in time repair notification

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Advanced Use Cases

• 30 advanced

use cases are

defined

– Detailed

requirements

– Main concerns

– Service flows

Use case group Use case name

Platooning

eV2X support for Vehicle Platooning

Information exchange within platoon

Automated Cooperative Driving for Short distance Grouping

Information sharing for limited automated platooning

Information sharing for full automated platooning

Changing Driving-Mode

Advanced Driving

Cooperative Collision Avoidance (CoCA)

Information sharing for limited automated driving

Information sharing for full automated driving

Emergency Trajectory Alignment

Intersection Safety Information Provisioning for Urban Driving

Cooperative lane change (CLC) of automated vehicles

3D video composition for V2X scenario

Remote drivingeV2X support for Remote Driving

Teleoperated Support (TeSo)

Extended Sensor

Automotive: Sensor and State Map Sharing

Collective Perception of Environment

Video data sharing for automated Driving

General

Communication between vehicles of different 3GPP RATs

Multi-PLMN environment

Use case on Multi-RAT

Use case out of 5G coverage

Dynamic Ride Sharing

Tethering via Vehicle

Proposal for secure software update for electronic control unit

Vehicle quality of service support

QoS aspect of vehicles platooning

QoS aspects of advanced driving

QoS aspects of remote driving

QoS Aspect for extended sensor

Different QoS estimation for different V2X applications

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Network Slicing and LADN• Network slicing (NS)

– Extend the current framework

– Provide integrated service

– Flexibility, scalability, efficiency

• Local Area Data Network (LADN)

– Localized information service

– Differentiated data provision

– Cloud integration with NS

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RAN1 leads the C-V2X Standard Development

• 3GPP RAN Working Group 1 is responsible for the

main tasks

– RAN2 handles the MAC layer design

– This is because the sidelink should be defined in the first

place

• The PC5 interface connects the vehicular to vehicular communication

• Operation modes may include the base station or not

• It is characterized by the centralized and distributed

modes

– RAN2 should be the focus on the medium access operation

– Protocol layers and the corresponding functions

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RAN1 Main Tasks on Standard Development (1/2)

• Sidelink design

– Physical layer structure

– Physical layer procedure

– Synchronization

– Resource allocation

• Uu evaluation

• Resource allocation and configuration

• QoS management

• Co-existence

• The original agenda

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RAN1 Main Tasks on Standard Development (2/2)

• Physical Layer Structure for sidelink

• Resource allocation for NR sidelink

– Mode 1

– Mode 2

– Other

• Sidelink synchronization mechanism

• In-device co-existence between LTE and NR sidelinks

• Physical layer procedures for sidelink

• Support of NR Uu controlling LTE sidelink

• Other

• Agenda changed by May 2019

– To enable the implementation of Release-16 V2X

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RAN2 Main Tasks on Standard Development

• General

• Sidelink design

– Scenarios

– L2/3 protocol design common for unicast, groupcast and broadcast

– L2/3 protocol design specific for unicast, groupcast and broadcast

– Resource allocation and configuration

– Others

• Uu enhancements

• RAT/interface selection

• QoS management

• Others

• The original agenda

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RAN2 Main Tasks on Standard Development

• General

• L2/3 protocols for mode 1 resource allocation

• L2/3 protocols for mode 2 resource allocation

• PC5 RRC procedures and information

• L2/3 protocols for QoS support

• L2/3 protocols for cross-RAT resource allocation

• L2/3 protocols common to mode 1 and mode 2 resource allocation

• Others

• Agenda changed by May 2019

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Mode 1 and Mode 2 Operation

• Mode 1 with gNB

– Under the supervision of base station

• Within coverage

– Some tasks can be centralized resolved

• Synchronization, collision, resource allocation, etc.

• Mode 2 distributed operation

– Sidelink is handled and managed by the UEs

• Sense and transmit

– Collision between DL/UL and SL

• Synchronization is also an issue

• QoS management

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RAN2 Progress: RAN2#105

• NR Sidelink agreed to support advanced use cases

• Casting types

– Unicast basis with AS

– Groupast agreed and no specific 1:M RLM

• Mode-1 resource allocation

• RAT/interface selection

– Consider in-coverage and out-of-coverage

• QoS management

– Data rate and casting types

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RAN2 Progress: RAN2#105bis

• New agenda items started

• Initiate the Uu controlling sidelink discussion

• BSR issues and configured grant

• RRC messages and signaling flow

• QoS model problem

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• Logical Channel Prioritization (LCP)

• UL/SL prioritization

• HARQ feedback support

• Cell (re)selection issue started

• QoS management

– CONNECTED/IDLE configuration

– Casting type specific

– SLRB configuration

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• UL/SL prioritization continued

– How to resolve it

– LTE and NR differentiation

• Cell reselection

– NR controlling LTE Uu and vice versa

• Exceptional resource pool configuration

• SLRB configuration details

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RAN2 Progress: RAN2#107bis

• SL HARQ

• UL/SL prioritization based on LCH priority

• Acknowledgement modes

• SDAP supported– Connection establishment and release

– Entity and session ID

• QoS information– Resource Type (GBR, Delay critical GBR or Non-GBR)

– Priority Level

– Packet Delay Budget

– Packet Error Rate

– Averaging window (for GBR and Delay-critical GBR resource type only)

– Maximum Data Burst Volume (for Delay-critical GBR resource type only)

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• UL/SL prioritization

– Continue with the comparison between SL/UL or DL,

LTE/NR

• CSI reporting

• RLC mode

• SL configure grant

• HARQ

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RAN2 Progress: RAN2#109-e

• Email discussion

– RRC for 5G V2X

– Cell selection/reselection: LTR or NR

– Feature list and UE capability

– HARQ based TX side RLM/RLF

– PDCP remaining issue

– CR and spec approval

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RAN2 Progress: RAN2#109bis-e


– RRC open issues: SIB and SL-SRB configuration

– ASN.1 issues

– Remaining MAC issues

– Remaining RLC issues

– RLM/RLF

– PDCP

– CR and corrections

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RAN2 Progress: RAN2#110-e


– Mixing of blind and feedback based HARQ retransmission of

a TB

– RRC ASN.1

– 38.331/36.331 CRs

– SIB12 overhead reduction

– UE capabilities issues

– Cell selection/reselection

– 38.321/36.321 updates

– PDCP issues, SDAP issues

– MAC issues

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RAN2 V2X QoS Management

• Per-flow/per-packet QoS model

• SDAP

• SLRB configuration

• Prioritization

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THANK YOU

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R16 NR V2X RAN2 Issues - std-share.itri.org.tw

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