New SI proposal: Feasibility Study on LTE-based V2X Services ...
Transcript of 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?
LTE World Summit 2014/Thomas Henze
LOCAL IS RELEVANT
LTE World Summit 2014/Thomas Henze
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
• Out of coverage case 2
• 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
• Out of coverage case 3
• 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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