new si proposal: feasibility study on lte-based v2x services

3GPP LTE-A標準制定與5G進展說明會講義

DEVICE-TO-DEVICE COMMUNICATION

IN 5G CELLULAR NETWORKS

作者：魏存毅 Chun-Yi WEI

現職：國立台北大學通訊系 National Taipei University

Usecases & Services

• Three emerging high level usecases for Next Generation

Radio Technology (also from IMT 2020 discussion):

1. Enhanced Mobile Broadband

2. Massive Machine Type Communications

3. Ultra-reliable and Low Latency

• Wide agreement that the Next Generation Radio

Technology should be able to support a variety of new

services

• Automotive, Health, Energy, Manufacturing ...

• Some of these new services are being described by SA1 in the

SMARTER project

New radio

• Emerging consensus that there will be a new, non-

backward compatible, radio as part of Next Generation

Radio Technology

• Strong LTE evolution continued in parallel © 3GPP 2012

• The requirements and scope of the new radio will be

established by RAN in the SI starting in December

• WGs will then proceed with the evaluation of technology solutions

in the SI starting in March

Phasing

• Emerging consensus that there should be two phases for

the normative work

• Phase 1 to be completed by H2 2018 to address a more urgent

subset of the commercial needs (to be agreed)

• Phase 2 to be completed by Dec 2019 for the IMT 2020 submission

and to address all identified usecases & requirements

• The above implies the following, tentative, release timing

The evolution

HOW TO BRING THE RIGHT PEOPLE

TOGETHER?

LTE World Summit 2014/Thomas Henze

HOW TO CREATE PROXIMATE

AWARENESS?


LOCAL IS RELEVANT


The applications of D2D

• Proximity-based networking, gaming

• Advertisement for by-passers

• Public-Safety

• and more… (imagination required)

The potential gains of D2D

• Capacity gain: due to the possibility of sharing spectrum

resources between cellular and D2D users.

• Peak rate gain: due to the close proximity and potentially

favorable propagation conditions high peak rates may be

achieved.

• Latency gain: when devices communicate over a direct

link, the end-to-end latency may be reduced.

• Coverage extension: the eNB’s coverage can be

extended with the assistance of D2D UE located in cell-

edge.

The illustration of D2D use cases

IEEE Communications Magazine • April 2014

The network control

• Device to Device and Cellular communications share the

same radio resources.

• The network controls and optimizes the use of the

resources for both Cellular communication and D2D,

resulting in enhanced performance and quality of service.

The types of D2D

The scenarios of D2D communications

IEEE Communications Magazine • April 2014

3GPP structure

D2D Roadmap

D2D in R12

• Objective:

• Coverage type:

• D2D discovery: in network coverage (intra-cell and inter-cell)

• D2D communication in network coverage (intra-cell and inter-cell), in

partial network coverage and outside network coverage.

• Application:

• The communication part is targeted to apply only to public safety use.

Scenarios UE1 UE2

1A: Out-of-Coverage Out-of-Coverage Out-of-Coverage

1B: Partial-Coverage In-Coverage Out-of-Coverage

1C: In-Coverage-Single-Cell In-Coverage In-Coverage

1D: In-Coverage-Multi-Cell In-Coverage In-Coverage

D2D operating bands

Channel bandwidths

• 10 MHz allocation for both UL and DL for FDD (20 MHz

for TDD) for both the general and Public Safety scenarios

• 10 MHz channel bandwidth for D2D_communications,

and all existing channel BWs per E-UTRA band be

baseline for D2D_discovery.

Discovery - Types of Discovery

• Type 1: a discovery procedure where resources for

discovery signal transmission are allocated on a non UE

specific basis

• Type 2: a discovery procedure where resources for

discovery signal transmission are allocated on a per UE

specific basis:

• Type 2A: Resources are allocated for each specific transmission

instance of discovery signals;

• Type 2B: Resources are semi-persistently allocated for discovery

signal transmission.

Procedure: D2D discovery

• In case of Type 1, a UE autonomously selects radio resources

from the indicated Type 1 transmission resource pool for

discovery signal transmission.

• In case of Type 2B, only an RRC CONNECTED UE may

request resources for transmission of D2D discovery messages

from the eNB via RRC. The eNodeB assigns resource via RRC.

• As baseline, UE releases the transmission resources the latest when

the UE enters RRC_IDLE or when the eNB withdraws the resource by

RRC signalling.

• In case of Type 2B as baseline radio resource are allocated by RRC.

Use of activation/deactivation of radio resources using PDCCH is FFS.

• Receiving UEs monitor both Type 1 and Type 2B discovery

resources as authorised.

Mode of D2D Communication

• From a transmitting UE’s perspective, a UE can operate in

two modes for resource allocation:

• Mode 1: eNodeB or a relay node schedules the exact resources

used by a UE to transmit direct data and direct control information

• Mode 2: a UE on its own selects resources from resource pools to

transmit direct data and direct control information

• D2D communication capable UE shall support at least

Mode 1 for in-coverage

• D2D communication capable UE shall support Mode 2 for

at least edge-of-coverage and out-of-coverage

Procedure: D2D Communication

• Scheduling Assignment (SA) • indicates the location of the resource(s) for reception of the

associated physical channel that carries D2D data are transmitted by the UE and the transmission pattern for data transmission (T-RPT)

• The SA resource pool includes reception pool(s) for modes 1 and 2 and the transmission pool for mode 2.

• For Mode 1: • The location of the resources for transmission of the SA by the

broadcasting UE comes from the eNodeB.

• For Mode 2: • A resource pool for SA is pre-configured and/or semi-statically

allocated.

• UE on its own selects the resource for SA from the resource pool and transmit its SA.

Format of Scheduling Assignment (SA)

R1- 142056

Format of Resource Pattern of

Transmission • The bitmap is mapped to the available D2D data

subframes within a data scheduling period

The source of interference to D2D

reception • D2D operates on the UL resource, i.e. UL spectrum for FDD bands

and UL subframes for TDD bands.

• D2D reception is hence subject to interference from:

• a) D2D UEs operating on the same channel due to in-band emissions.

• b) LTE UEs operating on adjacent channel due to both Tx emissions from

the LTE UEs and the receiver blocking of the D2D UE (LTE UE is the

blocker).

LTECell

LTETx

D2DRx

D2DTx(non-desiredforD2DRxUE)

D2DTx(desiredforD2DRxUE)

(b)LTEUEtoD2DUE

interference

(a)D2DUEtoD2DUEin-bandinterference

The impact of the interference to D2D Rx

UE • The minimum physical separation between the D2D Rx

UE and the interference (co-channel D2D UE or LTE UE

on adjacent channel

Table 7.1.1-1: D2D Rx UE (handheld) desense due to (a) co-channel D2D UE,

or (b) LTE UE on adjacent channel

FUL_low - FUL_high FUL_low - FUL_high Rxfreq Noise MCL

MHz MHz MHz MHz dBm/MHz MHz D2DTx D2DRx dBm/100kHz dB 23 15 8

LTEUE

(adj.UL)13 777 - 787 -13 10 10 -43 72 120 48 21

D2DUE

(IBE)14 788 - 798 -2.55 10 10 -33 82

LTEUE

(adj.UL)20 843 - 853 -10 10 10 -40 75 160 64 28

D2DUE

(IBE)20 832 - 842 -2.55 10 10 -33 82

UEdist(m)@UEavg.txpower

LTEUE(dBm)/D2DUE(23dBm)

Interferencecalculations

AntennaGain

793

837

Emissions

399

378

InterferingUE/

E-UTRABand/ULoperatingchannel

Interferer

20 832 - 842

Band

ProSeBand/

ProSeOperatingChannel

Band

14 788 - 798

Table 7.1.1-2: D2D Rx UE (vehicle) desense due to (a) co-channel D2D UE,

or (b) LTE UE on adjacent channel

FUL_low - FUL_high FUL_low - FUL_high Rxfreq Noise MCL

MHz MHz MHz MHz dBm/MHz MHz D2DTx D2DRx dBm/100kHz dB 23 15 8

LTEUE

(adj.UL)13 777 - 787 -13 10 1 -34 81 337 134 60

D2DUE

(IBE)14 788 - 798 -2.55 10 1 -24 91

LTEUE

(adj.UL)20 843 - 853 -10 10 1 -31 84 452 180 80

D2DUE

(IBE)20 832 - 842 -2.55 10 1 -24 91

20 832 - 842 837

1065

Interferer BandAntennaGain LTEUE(dBm)/D2DUE(23dBm)

14 788 - 798 793

1124

ProSeBand/

ProSeOperatingChannel

InterferingUE/

E-UTRABand/ULoperatingchannel EmissionsInterferencecalculations UEdist(m)@UEavg.txpower

Band

Priority of UE capabilities

• If UE transmission capabilities are limited at a given time:

• Cellular UL has highest priority

• Communication has higher priority than discovery both with in a

carrier and across carriers

• If UE reception capabilities are limited at a given time:

• Cellular DL has highest priority

• Communication reception is the second priority

• D2D discovery is the third priority

D2D synchronization

• Signal design – Synchronization signal (D2DSS) and

synchronization channel (PD2DSCH)

• Timing of transmitting D2DSS

• Type of D2DSS/PD2DSCH to relay

PD2DSCH Format

• PD2DSCH contents:

• DFN: 14 bits = 10 bits counter + 4 bits offset

• TDD UL-DL config: 3 bits:

• In case of FDD, this field is set to 000, purely for the purpose of

decoding of PD2DSCH and does not imply any other UE behaviour

• The UE is assumed to know a priori the duplex mode of the carrier

• In-coverage indicator: 1 bit

• Sidelink system bandwidth: 3 bits

• Reserved field: 20 bits set to a SIB-signalled or preconfigured value

in Rel-12

D2DSS Format

• 40 ms of periodicity.

• Primary D2D Synchronization Signal (PD2DSS)

• PD2DSS is a Zadoff Chu sequence

• Secondary D2D Synchronization Signal (SD2DSS)

• SD2DSS is a M sequence

• D2DSS ID in D2DSSue_net has range {0-167}

• D2DSS ID in D2DSSue_oon has range {168-335}

• Note that the index in the agreement where the index of the D2DSS

sequence in D2DSSue_oon is the same as the index of the D2DSS

sequence in D2DSSue_net assumes that the index is relative to the

start of the range of the respective set of sequences.

• A synchronization source has a physical layer identity known as

Physical Layer Identity (PSSID) and PSSID is the same as D2DSS

ID.

Timing of transmitting D2DSS -D2D communications

• For in-coverage UEs • A UE transmitting SA or D2D data, in each subframe in the D2DSS

resource, the UE shall transmit D2DSS

• the subframe does not conflict with cellular transmission from the UE perspective

• the subframe is within the SA or D2D data period in which SA or data is transmitted

• the UE is RRC_Connected and the eNB has instructed it to start D2DSS transmission

• the RSRP value of the UE is less than the threshold

• For an in-coverage D2D communication-capable UE that is not transmitting SA or D2D data

• the UE shall transmit D2DSS if the UE is RRC_Connected and the eNB has instructed it (by dedicated signalling) to start D2DSS transmission, AND the eNB has not instructed the UE (by dedicated signalling) to stop D2DSS transmission

Timing of transmitting D2DSS -D2D communications

• For out-of-coverage UEs

• A UE transmitting SA or data

• A UE shall transmit D2DSS if the D2D measurement for selected

transmission timing reference is below SynchSourceThresh

Timing of transmitting D2DSS -D2D discovery

• For a discovery UE, for each discovery pool, the UE shall transmit

D2DSS in the first subframe of the discovery pool if this subframe is

in the D2DSS resource, or otherwise in the latest subframe of the

D2DSS resource before the start of the discovery pool

Type of D2DSS/PD2DSCH to relay

• In-coverage UE

• If the UE is camping/connected to an eNB

• The D2DSS sequences and PD2DSCH contents are signalled by the eNB

• Partial Coverage

• If the UE selects D2DSS/PD2DSCH from in-coverage UEs as its

transmission timing reference and D2DSS belongs to D2DSSue_net

• The D2DSS sequences and PD2DSCH contents are the same as the

received

Type of D2DSS/PD2DSCH to relay

• Out of coverage case 1

• If the UE selects D2DSS/PD2DSCH from out-of-coverage UEs as its transmission timing reference and D2DSS belongs to D2DSSue_net

• The PD2DSCH contents are the same as the received PD2DSCH

• D2DSS is the sequence in D2DSSue_oon that has the same index as the received sequence in D2DSSue_net


• If the UE selects D2DSS/PD2DSCH from out-of-coverage UEs as its transmission timing reference and D2DSS belongs to D2DSSue_oon

• PD2DSCH contents are the same as the received PD2DSCH

• The D2DSS sequence is the same as the received D2DSS


• If the UE does not select any D2DSS/PD2DSCH as its transmission timing reference and it is not camping/connected to an eNB

• The PD2DSCH contents are determined by the pre-configuration

• The D2DSS sequence is arbitrarily selected from D2DSSue_oon

Decision to become a synchronization

source • For in-coverage UE, it can become a D2D

Synchronization Source at least if it is configured to do so

by the eNB

• For out-of-coverage UE, it may become a D2D

Synchronization Source if received signal strength of all

received D2DSS(s) by the UE are below a threshold.

Priority for Synchronisation source

selection • eNB

• UEs within network coverage

• among which higher priority is given to D2DSS received with

higher synchSourceThresh measurement

• UEs out of network coverage transmitting D2DSS from

D2DSSue_net

• among which higher priority is given to D2DSS received with higher

synchSourceThresh measurement

• UEs out of network coverage transmitting D2DSS from

D2DSSue_oon

• among which higher priority is given to D2DSS received with higher

synchSourceThresh measurement

Procedure of D2D synchronization

R1-143978

D2D in R13

• New WI: Enhanced Device to Device (eD2D) ProSe (RP-

142311)

• Type 1 discovery for the partial and outside network coverage

scenarios targeting public safety use

• Support the extension of network coverage using UE-to-Network

Relays, including service continuity (if needed), based on Release

12 D2D communication, considering applicability to voice, video.

• Enhance D2D discovery support in the presence of multiple

carriers and PLMNs

• Traffic switch between infrastructure path, relay path and direct path

Service Continuity and UE-NW

Relaying

eNB1

UE1 UE2

Switch eNB2

UE1-UE2

proximity

border

Switch

EPC

eNB1

UE2 UE1

Switch

UE1-UE2

proximity

border

UE3

EPC

Status of eD2D in R13

Estimated level of completion of the work/study item

overall (mandatory to be provided): Core part: 55% RAN4 Perf. part: XXX % RAN5 Testing part: XXX % SI: XXX % per WG (mandatory to be provided) for Core part or SI: RAN WG1: 100% RAN WG2: 60% RAN WG3: 30% RAN WG4: 25% RAN WG5: XXX%

Estimated completion date of the work/study item

This SI is planned to be 100% complete in: Dec 2015 The Core part WI is planned to be 100% complete in: Dec 2015 The Performance part WI is planned to be 100% complete in: June 2016 The Testing part WI is planned to be 100% complete in: XXXXXXX

R13 Core port finalization

• In Dec 2015

RAN #69 Q4/2015 RAN #70 R1L R1U R2L R2U R2J R3 R4RF

Core R4RD Core

R4RF Perf

R4RD Perf

R1L R1U R2L R2U R2J R3 R4RF Core

R4RD Core

R4RF Perf

R4RD Perf

82bis 82bis 91bis 91bis 91bis 89bis 76bis 76bis 76bis 76bis 83 83 92 92 92 90 77 77 77 77

3 1 1 1.5 3 1.5 1.5

The last WG discussion.

The focus of R13 eD2D

• Supporting Priority

• different mode-2 resource pools (for PSCCH and PSSCH)

• different sets of T-RPTs

• NOT Limited to above two methods

• The metric of UE-to-Network Relays selection

• Only RSRP, no RSRQ

• Discovery in non-primary carrier

• If the UE has the activated serving cell in non-primary carrier, then

the activated serving cell is always used for DL measurements and

synchronization

NEXT ?

D2D + mobility = V2V

V2X

• Cooperative Awareness Messages (CAM) for vehicular driving security are broadcasted using adapted D2D discovery channels and procedures • CAM messages are typically 300-

500 bytes in length and are delivered every 0.1-1s

• Support for occasionally out of coverage vehicles is required (the out of coverage discovery solutions for NSPS can be largely reused)

• The eNB controls V2V resources • Different RRM strategies are

possible within the resources allocated by the eNB

V2V (RP-142032 Ericsson)

LT

E

D2D

V2V

V2P V2I*

V2I RSU

(Road Side Unit

for DSRC)

Cellular network,

Internet, application

servers and so on

Pedestrian

(UE, mobile device)

Vehicle

Vehicle

V2X (RP-141958 LG Electronics)

3GPP TSG RAN Meeting #68 RP-151109

Malmö, Sweden, June 15 - 18, 2015

Source: LG Electronics, CATT, Vodafone, Huawei

Title: New SI proposal: Feasibility Study on LTE-based V2X Services

Document for: Approval

Agenda Item: 13.1.1

Title: Feasibility Study on LTE-based V2X Services

Acronym: FS_LTE_V2X

NEW study item approved – V2X

EU Roadmap 1/2

EU Roadmap 2/2

Reference

• 3GPP TR 36.843 V c.0.1 (2014-03)

• 3GPP Radio Access Network : Rel-12 and beyond, Dino

Flore, 3GPP RAN Chairman

• 3GPP TR 36.877 V c.0.0 (2015-03)

• RP-141894_Status_Report for D2D

• RP-151337_Status_Report for eD2D

• 3gpp.org

3GPP Documents on D2D • SA1

• TR 22.803 “Feasibility study for Proximity Services (ProSe)”

• TS 22.278 “Service requirements for the Evolved Packet System (EPS)”

• TS 22.115 “Service aspects; Charging and billing”

• TS 21.905 “Vocabulary for 3GPP Specifications”

• SA2

• TR 23.703 “Study on architecture enhancements to support Proximity-based Services (ProSe) (Release 12)”

• TS 23.303 “Proximity-based services (ProSe); Stage 2 (Release 12)”

• SA3

• TR 33.833 “Study on security issues to support Proximity Services”

• RAN1 & RAN2

• TR 36.843 “Study on LTE Device to Device Proximity Services - Radio Aspects

• RAN4

• TR 36.877 “LTE Device to Device Proximity Services User Equipment (UE) radio transmission and reception.

• CT1

• TS 24.333 “Proximity-services Management Object (MO)”

• TS 24.334 “Proximity-services (Prose) User Equipment (UE) to Proximity-services (ProSe) Function aspects (PC3); Stage 3”

THANK YOU

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