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D2X and Next Generation
Architecture: Trend and Status
Shubhranshu
2016/03/04
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Content
Introduction
3GPP D2D/ProSe & NexGen: System Architecture Perspectives
Architecture Model and Concepts
ProSe Function, D2D interface, etc
ProSe Discovery
EPC support for WLAN direct discovery and communication
3GPP SA2 NexGen
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Introduction (1)
ProSe = 3GPP Proximity Services
Discovery Communication
In-coverage Partial coverage Out-of-coverage
EPC Assisted Direct
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Open Restricted
Major contributors in 3GPP:
Qualcomm, Intel, ALU, Ericsson, Telecom Italia,
Huawei, Samsung, ….…
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Introduction (2)
Definitions from TS 23.303
ProSe Direct Communication: A communication between two or more UEs in proximity that are ProSe-enabled, by means of user plane transmission using E-UTRA technology via a path not traversing any network node.
ProSe Discovery: A process that identifies that a UE that is ProSe-enabled is in proximity of another, using E-UTRA or EPC.
ProSe Direct Discovery: A procedure employed by a ProSe-enabled UE to discover other ProSe-enabled UEs in its vicinity by using only the capabilities of the two UEs with E-UTRA technology.
EPC-level ProSe Discovery: A ProSe Discovery procedure by which the EPC determines the proximity of two ProSe-enabled UEs and informs them of their proximity.
Definitions from TS 22.278
Open ProSe Discovery: is ProSe Discovery without explicit permission from the ProSe-enabled UE being discovered.
Restricted ProSe Discovery: ProSe Discovery that only takes place with explicit permission from the ProSe-enabled UE being discovered.
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Introduction (3)
ProSe, why?
Enables LTE to become a competitive (cost efficient) broadband
communication technology (e.g. PS networks)
The close location of nodes allows for high data rates at low latency
and low energy consumption (proximity-gain);
Reuse of transmission resources within the same cell by cellular as well
as D2D links is possible, thereby increasing the reuse factor (reuse-
gain);
Only one direct link is required, compared to up- and downlink in
cellular communication; less resources are used in overall (hop-gain);
Switching from infrastructure to direct path offloads cellular traffic,
alleviating congestion, and thus benefitting other non-D2D UEs as
well.
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Introduction (4)
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Release 12
• TR 23.703: Study on architecture enhancements to support Proximity-based Services (ProSe);
• TS 23.303: Proximity-based services (ProSe); Stage 2;
Release 13
• TR 23.713: Study on extended architecture support for proximity services;
• TS 23.303: Proximity-based services (ProSe); Stage 2.
Timeline
Rel-14
03/2016 - …… ?
V2V, V2I, V2P, D2D for Wearables, IoT…
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Architectural Reference Model
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Non-Roaming Reference Architecture
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ProSe Function
Provision of the UE with necessary parameters in order to use ProSe
Direct Discovery and ProSe Direct Communication;
To allocate and process the mapping of ProSe Application IDs and ProSe
Application Codes used in open ProSe Direct Discovery;
Authorization of discovery requests;
Provision of security material to UEs in order to protect discovery
messages transmitted over the air;
Provides the necessary charging and security functionality for usage of
ProSe;
….
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ProSe Discovery - Overview
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Open Discovery Non-PS / PS UE – in coverage
Restricted Discovery Non-PS
Model A Model B
Public Safety Discovery
EPC Assisted Discovery Direct Discovery
Model A Model B (on-demand) With application-controlled extensions
Release-12 Release-13
Model A Model B
On-demand announcing
UE-to-Network Relay Group member discovery UE-to-UE Relay
Scope of this tutorial
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Model A / Model B
Model A: involves one UE announcing "I am here"
This model defines two roles for the ProSe-enabled UEs that are
participating in ProSe Direct Discovery.
Announcing UE: The UE announces certain information that could be used
by UEs in proximity that have permission to discover.
Monitoring UE: The UE that monitors certain information of interest in
proximity of announcing UEs.
Model B: involves one UE asking "who is there" and/or "are you there"
This model defines two roles for the ProSe-enabled UEs that are
participating in ProSe Direct Discovery.
Discoverer UE: The UE transmits a request containing certain information
about what it is interested to discover.
Discoveree UE: The UE that receives the request message can respond with
some information related to the discoverer's request.
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EPC-level ProSe Discovery procedures
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Contributing companies in SA2: Intel, ALU, ITRI,..…
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Proximity Alert
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FS_NexGen: Study on Architecture for Next Generation System
Progress so far
A set of definitions and architectural assumptions and principles are adopted.
A list of topics/aspects that need to be handled preferentially is identified and adopted as an
annex for the TR. It includes the RAN-CN function split as a basis for determining the work split
between WGs.
Agreed Key Issues so far:
Support of network slicing
QoS framework
Mobility framework
Session management
nabling (re)selection of efficient user plane paths
minimizing access dependencies of the Next Generation core and access - core interface
……
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FS_NexGen: Study on Architecture for Next Generation System
Major companies involved
Amost all big (& smaller) companies
Next steps:
Continue to work on the TR 23.799 (& subsequently on the TS)
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Thank you
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