Overview of D2D Proximity Services Standardization ...

Overview of D2D Proximity Services Standardization in 3GPP LTE

Workshop on Radio Access and Spectrum Session 2: Device-to-Device Communications and Public Safety Michael Gundlach, Nokia Bologna, Italy, 2014-06-23

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22/06/2014 © Nokia 2014

Dr. Michael Gundlach

Acknowledgement  This presentation is within the scope of CRS-i, the cognitive radio standardization initiative – from FP7 research to global standard  It has partly been prepared by Christian Mouton, NEC Technologies (UK)

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22/06/2014 © Nokia 2014

Dr. Michael Gundlach

Motivation Device-to-device (D2D) communication, i.e. direct communication between nearby mobile devices, will be added to LTE in 3GPP Release 12 within several work items related to “Proximity Services”.  General advantages 

improve spectrum utilization



improve overall throughput and performance



improve energy consumption



enable new peer-to-peer and location-based applications and services

 Advantages related to public safety 

fallback public safety networks that must function when cellular networks are not available or fail



closing the evolution gap of safety networks to LTE

 Challenges and risks  3

Business opportunity related to the long-standing cellular architecture

22/06/2014 © Nokia 2014

Dr. Michael Gundlach

Data Paths for Proximity Based Service Communication UE 1

UE 1

eNB

eNB

SGW/PGW

SGW/PGW

UE 2

UE 2

eNB

eNB

Default data path scenario in the EPS for communication between two UEs UE 1

eNB

UE 2 SGW/PGW

Source: 3GPP TR 22.803 V12.2.0 (2013-06) “Feasibility study for Proximity Services (ProSe)”

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eNB

“Locally-routed" data path in the EPS for communication between two UEs when UEs are served by the same eNBs

The "direct mode" data path in the EPS for communication between two UEs

Direct over-the-air data exchange between devices  For 3GPP, the direct over-the-air exchanges between devices can be:  

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either based on a new air interface (designed by 3GPP RAN) or based on WLAN air interface

22/06/2014 © Nokia 2014

Dr. Michael Gundlach

Use Cases and Scenarios  Public Safety Use Cases

 General Use Cases              6

Restricted ProSe Discovery Use Case Open ProSe Discovery Use Case Discovery Use Case with Subscribers from Different PLMNs Discovery Use Case with Roaming Subscribers Network ProSe Discovery Use Case Service Continuity between Infrastructure and E-UTRA ProSe Communication paths Operator A uses ProSe to Enhance Location and Presence Services ProSe for Large Numbers of Ues ProSe-assisted WLAN Direct Communications Use Case Service Management and Continuity for ProSe-assisted WLAN Direct Communications Use Case for ProSe Application Provided by the ThirdParty Application Developer Concurrent E-UTRAN Infrastructure and WLAN Proximity Communication Network Offloading via WLAN ProSe Communication

22/06/2014 © Nokia 2014

Dr. Michael Gundlach

           

ProSe Discovery Within Network Coverage ProSe Discovery Out of Network Coverage Can Discover But Not Discoverable Basic ProSe One-to-One Direct User Traffic Initiation in Public Safety Spectrum UE with Multiple One-to-One Direct User Traffic Sessions in Public Safety Spectrum ProSe Group ProSe Broadcast ProSe Relay ProSe Hybrid and Range Extension ProSe Range Public Safety Implicit Discovery Co-existence of ProSe Communication and E-UTRAN communication

Example General Use Case ProSe-assisted WLAN Direct Communications Use Case This use case describes how WLAN direct communication can be used between ProSe-enabled UEs  Pre-Conditions







Bob and John are subscribers to a mobile data service from an MNO;



Bob and John both carry UEs that have WLAN capabilities;



Both UEs are enabled for ProSe Discovery and Communication;



Bob and John use ProSe-enabled applications on their UEs;



The 3GPP network has the capability to provide WLAN configuration information to ProSe-enabled UEs;



Bob has clicked the ProSe-enabled UE to send an HD video to John.

Service Flows 

The 3GPP EPC determines proximity of Bob’s and John’s UEs and provides them with WLAN configuration information to assist with WLAN direct connection establishment.



Bob’s and John’s UEs use the configuration information to verify feasibility of the WLAN direct connection and establish ProSe-assisted WLAN direct communications.



The ProSe-enabled application on Bob’s UE streams the HD video to the ProSe-enabled application on John’s UE using the established WLAN connection.

Post-Conditions 

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John has received Bob’s HD video via the ProSe-enabled application on his UE.

22/06/2014 © Nokia 2014

Dr. Michael Gundlach

Example Public Safety Use Case ProSe Broadcast This use case describes the scenario where a given UE initiates a ProSe Broadcast Communication transmission to all UEs within transmission range.  Pre-Conditions       



Service Flows    

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An operator offers a service, which makes use of the ProSe feature. Fire-fighters A-D, E-H and an incident commander use ProSe-enabled public safety UEs. Fire-fighters A-D, E-H and an incident commander are subscribed to a Public Safety service that allows them to use ProSe. Fire-fighters A-D’s UEs are configured to belong to communications group X. Fire-fighters E-H’s UEs are also configured to belong to communications group Y, which is separate from fire-fighters A-D. The incident commanders UE is configured to belong to communication group X and communication group Y. The fire-fighters may or may not be in E-UTRAN coverage. After arriving at the scene of a fire, fire-fighters A-D’s UEs discover each other and communicate among themselves in communications group X using ProSe Group Communications. Later, fire-fighters E-H also arrive on the fire scene and communicate among themselves in communications group Y using ProSe Group Communications. At some point, the incident commander wants to provide the same information concurrently to all of the fire-fighters at the scene of the incident within transmission range. The incident commander’s UE transmits a ProSe Broadcast Communications message to all of the fire-fighters’ UEs. A single transmission is received by all of the fire-fighters’ UEs rather than individual transmissions being sent to each of the fire-fighters.

22/06/2014 © Nokia 2014

Dr. Michael Gundlach

Scenarios

PLMN A UE1

UE2

1A UE2 UE1

When the registered PLMN, Proximity based service direct communication path and coverage status (in coverage or out of coverage) are considered, there are a number of different possible scenarios. Additional scenarios may be added.

1B PLMN A

PLMN A

PLMN A

UE2 UE2

UE1

UE1

1C

1D

PLMN A

PLMN B

PLMN A

PLMN B

UE1 PLMN A UE1 PLMN A UE2 PLMN B

Source: 3GPP TR 23.703 V12.0.0 (2014-02) Study on architecture enhancements to support Proximity-based Services (ProSe) (Release 12)

1E

PLMN A

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Dr. Michael Gundlach

1F

PLMN B

UE1 PLMN A

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UE2 PLMN B

1G

UE2 PLMN B

Supported E-UTRAN ProSe direct communication Modes Two different modes for ProSe direct communication are supported:  Network independent direct communication: This mode of operation for ProSe direct communication does not require any network assistance to authorize the connection and communication is performed by using only functionality and information local to the UE(s). This mode is applicable: 

only to pre-authorized ProSe-enabled Public Safety UEs;



regardless of whether the UEs are served by E-UTRAN or not;



to both ProSe direct communication one-to-one and to ProSe direct communication one-to-many.

 Network authorized direct communication: This mode of operation for ProSe direct communication always requires network assistance by the EPC to authorize the connection. This mode of operation applies:

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

to ProSe direct communication one-to-one;



when both UEs are "served by E-UTRAN"; and



for Public Safety UEs it may apply when only one UE is served by E-UTRAN.

22/06/2014 © Nokia 2014

Dr. Michael Gundlach

System Architecture PC1

A ProSe Function is introduced in the network and has the following main roles:  Provisioning (via the Direct Provisioning Function - DPF)  Direct discovery management (e.g. allocation of ProSe Application code)  EPC discovery (acting as a location services client)

MME S/PGW ProSe application

LTE-Uu

UE B

E-UTRAN

HSS PC5 ProSe application UE A

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Dr. Michael Gundlach

SLP

LTE-Uu PC4a PC3

PC1 11

S6a

S1

ProSe Function

PC4b

PC2

ProSe Application Server

3GPP structure Project Co-ordination Group (PCG) TSG GERAN GSM EDGE Radio Access Network

TSG RAN Radio Access Network

TSG SA Service & Systems Aspects

TSG CT Core Network & Terminals

GERAN WG1 Radio Aspects

RAN WG1 Radio Layer 1 spec

SA WG1 Services

CT WG1 MM/CC/SM (lu)

GERAN WG2 Protocol Aspects

RAN WG2 Radio Layer 2 spec Radio Layer 3 RR spec

SA WG2 Architecture

CT WG3 Interworking with external networks

GERAN WG3 Terminal Testing

RAN WG3 lub spec, lur spec, lu spec UTRAN O&M requirements

SA WG3 Security

CT WG4 MAP/GTP/BCH/SS

RAN WG4 Radio Performance Protocol aspects

SA WG4 Codec

CT WG6 Smart Card Application Aspect

RAN WG5 Mobile Terminal Conformance Testing

SA WG5 Telecom Management

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Dr. Michael Gundlach

Maintenance of Work Items and Documents  Work/Study Items are created on a per-Technical Group basis and progress is tracked on a per-TG basis.  Study Items are for feasibility studies and deliver Technical Reports, which are nonnormative documents, used to feed the subsequent (if any) normative phase which deliver Technical Specifications.  Working Groups reports and specifications have to go through an approval process by their own Technical Specifications Group.  Technical Reports are not maintained.

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Dr. Michael Gundlach

Work Prioritization in 3GPP Release 12  In September 2013, TSG SA reviewed the Rel-12 progress in different working groups. Due to the important activities in the radio access area, not only due to proximity services, 3GPP TSG RAN proposed to reduce the scope of proximity services in Rel-12. Similarly, experimenting an overload situation, 3GPP WG SA2 proposed to limit Rel-12 to a list of essential features. Based on these information, 3GPP TSG SA decided to limit the proximity features for Rel-12 to discovery and public safety group communication.

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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”

 CT1

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

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”

22/06/2014 © Nokia 2014

Dr. Michael Gundlach

Progress in 3GPP Work Item

Completion

Status

Proximity-Based Services (ProSe) SA1 part – TR & TS phases

100 %

Completed

SA2 part – TR & TS phases

100 %

Completed

SA3 part – TR phase

40 %

Expected to be completed June 2014

SA3 part – TS phase

0%

tbd

Study on LTE device to device proximity services – Radio Aspects (sFS_LTE_D2D_Prox) RAN1/2/4 part – TR phase

100 %

Completed

RAN1/2/4 part – TS phase

65 %

Expected to be completed June 2014

CT aspects of proximity-based services (ProSe-CT) Overall CT

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0%

Dr. Michael Gundlach

New WI, expected to be completed September 2014

3GPP Roadmap CY11

CY12

CY13

CY14

CY15

Stage1 Release 12 ProSe • ProSe Discovery • ProSe Communication 1-to-Many • ProSe UE-to-NW relay (with no RAN impact) • ECP support for WLAN

Tentative Release 13 ProSe • Communication: − 1:1 communication, direct, via eNB − Service continuity • Discovery: − Interaction with 3rd party apps & UE terminal apps

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Dr. Michael Gundlach

Stage 2 Stage 3

Stage1 Stage 2 Stage 3

Final Remarks  CRS-i will continue to deliver regular standardization update reports regarding D2D in 3GPP  The first report has been produced by NEC Technologies (UK) on March 19, 2014  CRS-i would be happy to discuss with your project the possibility of joint contributions to standards on cognitive radio and dynamic spectrum access, including D2D Proximity Services; for this please contact the CRS-i Consultancy Service on Standardization (http://www.ict-crsi.eu/index.php/contact-us)

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22/06/2014 © Nokia 2014

Dr. Michael Gundlach

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22/06/2014 © Nokia 2014

Dr. Michael Gundlach