3gpp sidelink and its proposed extensions to other topics...

3GPP Sidelink and its proposed extensions to other topics such as eV2X and FeD2D

ICL 蔡華龍 (Hua-Lung Tsai) 106年05月05日

Copyright 2017 ITRI 工業技術研究院

Outline

What is the Sidelink ? Further Enhancements LTE Device to Device, UE to Network Relays for IoT and Wearables in Rel.14 LTE-based V2X Services in Rel. 14 Cellular Advanced V2X services in Rel-15


What is the Sidelink ?

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• Sidelink is a direct link for communications between devices – Sidelink has been used for several applications, such as Proximity

service (D2D), V2V, V2P, IoT, wearable. • Sidelink provides different operations for end-to-end communication

– Distributed control and managements among devices – Direct communication with and without network coverage – Extended range of communication through relay

• Potential se cases for NR sidelinks – SA1 V2X requirements

• Including V2V and V2P – Public safety NR D2D for out of network and in-network – IoT: including machine type communication and sensors – Wearable devices: communication between devices

Sidelink Use Cases


A generic sidelink framework for all use cases A single mode operation for communication between different use cases

– e.g. V2P Co-existence and inter-working between different applications in the

same spectrum – e.g. wearable devices, IoT devices, ProSe Flexible duplex – Dynamic resource allocation of DL/UL/SL Minimize mutual interference – joint interference management among

DL/UL/SL with different sidelink applications Extended coverage through relay by same or different sidelink

applications.

Sidelink Framework


Further Enhancements LTE Device to Device, UE to Network Relays for Wearables

New SI: Enhanced Device to Device ProSe (RP-160677) – March. 2016, RAN#71 – RAN2 leads this working item (Qualcomm , Huawei, Intel ,LG) – Objective:

Enhancement of UE-to-Network relaying functionality for Wearable and IoT Enhancements to enable reliable unicast PC5 link to at least support low power, low rate and low complexity/cost devices. (IoT)


Use Case to LTE Device to Device, UE to Network Relays for IoT and Wearables

Source: Qualcomm RP-160268


Architecture • R2-162529 On Scenarios and Objectives for Wearables and feD2D Ericsson

− rUE: relay UE − wUE: wearable UE

Source: R2-162529

Schematic architecture showing the considered nodes and interfaces

Coverage scenarios


• R2-162741 Scenarios for FeD2D Qualcomm

PC5 based UE-to-Network Relay

PC5

Uu (Uplink and Downlink)

Uu (Downlink)

Remote UE

Relay UE

Bidirectional relay Uni-directional relay

Advantage of D2D relay for Cat-M remote UE Advantage of D2D relay for NB-IOT remote UE


Gaps between current D2D and enhancement for FeD2D

R12/13 D2D Enhancement for FeD2D Communication type

Broadcast/Groupcast Unicast

Retransmission Blind retransmission Feedback, HARQ optimization

Link adaptation No Adaptive MCS, Tx power, resource

Power control Open loop Closed loop Data rate Low Diverse Power consumption Impacted by blind

retransmission Need to consider power saving solution

Complexity Not optimized for Wearables and IoT devices

Simplified channel design and signal design; Narrow band sidelink

Operation bandwidth

Full band Need to support variable operation bandwidth

Resource allocation Mode 1 and Mode 2 Relay UE assisted resource allocation


• Combinations of Uu and PC5 interface capabilities for Relay and Remote UEs

• For Relay UE, the full system bandwidth processing capability at Uu and PC5 air-interface is assumed.

• For Remote UE, the following options are considered: Option 1. The narrow bandwidth processing capability at Uu and PC5

air-interface (i.e. Cat M1, Cat). Option 2. The full system bandwidth processing capability at Uu and

PC5 air-interface is assumed.

Requirements for Sidelink Wearable/IoT/Relaying

Source: Intel


• Sidelink Synchronization Scanning for synch. Signal Avoid increasing UE power consumption Avoid downgrading synchronization accuracy

(narrow band signal and low cost oscillator )

Physical Layer enhancement for Sidelink Synchronization (1/2)


• Synchronization Assistance Relay UEs (assisting cellular terminals) can serve as a synchronization

donors for sidelink synchronization of proximate Remote UEs, even for the case when remote UEs are in-coverage.

Sidelink physical structure of PSSS/SSSS/PSBCH and synchronization procedure needs to be reconsidered for bandwidth limited UEs in order to simplify and reduce power consumption of sidelink synchronization process.

Physical Layer enhancement for Sidelink Synchronization (2/2)


• Physical Structure of Sidelink Discovery Channel .

• Discovery Assistance

Physical Layer enhancement for Sidelink Discovery


• RRM for Relay Support of wearable and UE-to-NW relaying use cases may require

radio-resource management function at the cellular assisting UE (Relay UE) in order to support concurrent communication with multiple Remote UEs or avoid conflict in terms of cellular and sidelink operation.

The radio-resource management function can be enabled at Relay UE (cellular assisting UE) under eNB control.

Physical Layer enhancement for Sidelink Communication


Physical Layer enhancement for UE-to-NW Relaying

Conflict free operation for UE-to-NW Relaying.

Multi-hop and UE-to-UE relaying

Bidirectional and unidirectional relaying modes.


Introduction V2X • China shows great interest in vehicular communications

– In 2014, CCSA has finished the feasible study for vehicle safety application based on TD-LTE

– The series of industrial standard of communication based on LTE for vehicle application began

– In 2015, the frequency study of V2X also started – National Regulatory Authority in China will allocate the

frequency of connected vehicles • Vehicle manufacturers and cellular network operators also

show strong interests in vehicle wireless communications for proximity safety services as well as commercial applications

• 3GPP’s goal is to realize “connected car” via LTE

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*CCSA (China Communications Standards Association) 中國通信標準化協會


V2X國際主流性評估

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LTE-V2X activities in China National key project “Standardization and prototyping for LTE-V wireless transmission

technology (2016-2017)” was released by MIIT Shanghai Intelligent Connected Vehicle Pilot Area” was approved by MIIT, China . Initial

plan was disclosed by Shanghai International Automobile City Phase 1 (present-2016.6): 40 connected vehicles (802.11p and LTE-V2X) Phase 2 (2016.7-2017.12): 400 connected vehicles (802.11p and LTE-V2X) Phase 3 (2018.1-2019.12): 1000 connected vehicles (LTE-V2X)


V2X實際場域佈建資訊

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5G Automotive Association Mission Statement of 5GAA Develop, test and promote communications solutions, initiate their standardization and accelerate their commercial availability and global market penetration to address society’s connected mobility and road safety needs with applications such as autonomous driving, ubiquitous access to services and integration into smart city and intelligent transportation


Rel.14 WID LTE-based V2X Services

New WI proposal: LTE-based V2X Services (RP-161298) June. 2016, RAN#72 RAN1 leads this working item (LG Electronics, Huawei, HiSilicon,

CATT) Objective:

To specify enhancements to both SC-PTM and MBSFN transmissions for support of V2X services including:

To specify enhancements to UL SPS transmissions for support of V2X services including:

To specify enhancements for support of V2P service To specify solution(s) facilitating long-term basis co-channel coexistence

between DSRC/IEEE 802.11p and LTE PC5 for V2V operating over the same frequency channels [RAN1]

To specify other enhancements to PC5/Uu for V2X


Definition for V2X Road Side Unit an entity supporting V2I Service that can transmit to, and

receive from a UE using V2I application. RSU is implemented in an eNodeB or a stationary UE.

V2I Service (Vehicular-to-Infrastructure/Network) a type of V2X Service, where one party is a UE and the

other party is an RSU both using V2I application. V2P Service (Vehicular-to-Pedestrian) a type of V2X Service, where both parties of the

communication are UEs using V2P application V2V Service (Vehicular-to-Vehicular) a type of V2X Service, where both parties of the

communication are UEs using V2V application 22


Synchronization source priorities for V2V sildelink

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GNSS

UE directly synchronized with GNSS

UE indirectly synchronized with GNSS

UE without any Synchronization

Source

eNB

UE directly synchronized

with eNB

UE indirectly synchronized

with eNB

UE without any Synchronization

Source

Highest priority Second priority


Why need the UE autonomous resource (re)selection mode?

Need the UE autonomous resource (re)selection mode

Some parts will move to V2X WID

Source : Qualcomm


PC5 enhancements for V2V (Resource Allocation)


UE autonomous resource (re)selection mode(cont’d)

• Terms and Definitions for UE autonomous Resource Reselection mode


• Co-channel coexistence between DSRC/IEEE 802.11p and LTE PC5 for V2V operating over the same frequency channels

Co-channel coexistence between IEEE 802.11p and LTE PC5 for V2V

Resource mapping for the LTE-ITS detection sequence

RX power probe measurement at blank LTE-V2V subframes


Evolution of LTE-V2X & NR

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Source: LG

• Approve at RAN#75 an SI for 3GPP V2X phase 3. – SID is proposed in – A WI is also expected for 3GPP V2X phase 2 which is to be specified within Rel-15.

• Study scope can be prioritized based on input on the commercial demand. – A spin-off WI can be considered in Rel-15.

• Initial study needs to focus on the completion of eV2X evaluation methodology. – This is a leftover from NR phase 1 SI.

SI on 3GPP V2X phase 3

Rel-15 Rel-16

WI on 3GPP V2X phase 3

WI on 3GPP V2X phase 2

Rel-14 WI on 3GPP V2X phase 1

(Rel-14 LTE V2X) Backward compatible

Non-backward compatible

3GPP V2X evolution path


Enhanced V2X services in SA1 • SA1 study was completed with TR 22.886 and normative WI is approved

in. • Four categories of eV2X use cases

(1)

(2)

<Platooning> <Advanced driving>

<Extended sensors> <Remote driving> Source: LG


Enhanced V2X services in SA1 • Summary of KPIs

Latency Reliability Data rate Communication range

Platooning

10 ~ 25 ms 90 ~ 99.99% 12 kbps ~ [65] Mbps [5] ~ [10} sec * relative speed

Advanced driving

[3] ~ [100] ms

[99.99] ~ [99.999]%

65 kbps ~ [50] Mbps (inc. DL [0.5] UL [50] Mbps)

[5] ~ [10} sec * relative speed

Extended sensors

3 ~ 100 ms 90 ~ 99.999% 25 ~ 1000 Mbps 50 ~ 1000 meters

Remote driving

5 ~ [20] ms [99.999]% UL 25, DL 1 Mbps

General requirement on positioning: Relative lateral position accuracy of 0.1 m between UEs

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