1. The Role of D2D Communications in Public Safety: A Networking Perspective Dr. Leonardo Goratti (Supported by Dr. Tinku Rasheed)

2. Few Basic Facts - Traffic Volume Use cases Connected Devices &
Avalanche of
Traffic Volume
Large diversity of
Use cases
&
Requirements
Massive growth in
Connected Devices
Further expansion of mobile broadband
Additional traffic due to communicating machines
“Communicating machines”
Device-to-Device Communications
Car-to-Car Comm.
New requirements and characteristics due to communicating machines
“1000x in ten years”
“50 billion devices in 2020”
Source: A. Osseiran, “Toward a 5G Mobile & Wireless System Concept” FIA Athens March 2014

3. What is the Situation for the Public Safety Community?

4. Current Status for Public Safety – 1
Public protection and Disaster Relief Organizations (PPDR) intervene in the aftermath of a crisis and include police forces, fire fighters, medical aid (e.g. 911 in the USA or 112 in Europe)
Professional Mobile radio (PMR) networks provide communications for PPDR users
Crisis scenarios
Special events
TETRA, TETRAPOL, P25

5. Current Status for Public Safety – 4
■　Carriers restricted voice traffic by as much as 70 to 95 percent.*
■　Packet traffic, however, was either not restricted or restricted at a lower rate (0 to 30 percent) than voice traffic.
■　Carriers restricted phone traffic by as much as 80 to 90 percent.*
Max. outgoing traffic restrictions
* There was 4 to 9 times the normal volume of traffic (NTT East.)
* There was 50 to 60 times the normal volume of traffic (DoCoMo).
Fixed-line Communications
Mobile Communications
voice
packet

6. Current Status for Public Safety – 3

7. D2D Communications

8. D2D Communications – 3GPP
3GPP studies D2D as part of the wider concept of Proximity Services (ProSe)
D2D communication is defined as the communication between two UEs in physical proximity using LTE air interface to set up a direct link without routing via base station and possibly core network.
In Rel. 12 3GPP considered ProSe D2D and isolation conditions for public safety
More is expected in 3GPP Rel. 13

9. D2D Communications – FP7 ABSOLUTE (www.absolute-project.eu)
D2D scenarios 1
D2D scenarios 3
D2D scenarios 2

10. D2D Communications – Public Safety
D2D communications for PPDR organizations
Range extension
Relieve lack of resources or network failures
Guarantee voice services
Group calls (one-to-many)
Direct calls (one-to-one)
Fast call setup time: few milliseconds with LTE-A
Message dispatching
Many new ones
High-definition video,
Social networking, location augmentation, MTC, location-based services, and fast file transfer
D2D communications exploit the physical proximity of professional user equipments