GLOVE Architecture integration of GNSS and vehicular communications

10:20-12:20, Nov 3, Mon
Room: Schubert 1, First Floor

Riccardo Scopigno

Director of MLW Research Area of ISMB


Vehicular ad hoc networks (VANETs) are considered as one of the most valuable means for improving road safety and transport efficiency and as an enabler of value-added services for passengers and drivers. With VANETs, drivers will receive information about nearby nodes (also beyond their visual horizon) and about events occurring in the neighborhood: this will represent a concrete opportunity for further improving the driving experience and safety, leveraging ICT solutions.
VANETs have already been standardized (international harmonization is still in progress) and undergone field operational tests. Even if they are still being investigated for solving possible issues related to their scalability in the future – when a large number of cars will have been equipped with VANET transceivers – they are ready for day-1 exploitation.

VANETs are expected to have the same impact on driving, as GNSS (GPS) navigators had in the past years, with an ever increasing number of equipped cars. Even more, the availability and reliability of positioning based on Global Navigation Satellite Systems (GNSS) is still improving and, last but not least, new GNSSes are being deployed. In particular, Galileo is the European global satellite-based navigation system, a unique civil system under civil control that will start early services in 2015. By offering dual frequencies as standard, Galileo will deliver real-time positioning with unprecedented accuracy for a publicly available system. Furthermore, Galileo will offer enhanced availability and coverage with respect to other navigation systems. There is no need to wait to the full constellation in order to join the significant improvements, because it is fully interoperable with GPS, the United States’ Global Positioning System.

From a conceptual point of view, VANETs and Galileo are just two enablers.
GLOVE is a technological STREP project which addresses the mutual benefits coming from the cross-domain integration between the two.
The problem is split into three steps, corresponding to the functional blocks constituting the overall GLOVE OBU: a GNSS receiver (OBUg) suitable to receive GPS/Galileo signals and to exploit SBAS (Satellite Based Augmentation System) corrections (e.g. provided by EGNOS or EDAS), integrating also information other than GNSS signals (e.g. from VANET domain); a VANET transceiver/router (OBUv) benefiting as much as possible from both time and space information; a block (OBU^) performing the integration between GNSS and VANET data, expected to improve existing vehicular services and to enable novel ones.

PART 1: The role of GNSS in VANETs (45 min)
• Fundamentals of VANETs
   o MAC issues in VANETs (hidden terminal, congestion, spatial reuse).
   o Decentralized congestion control techniques
• The role of Galileo and GPS time and position in current VANET solutions
   o Position in CAM/DENM messages
   o Geo-forwarding
   o Channel switching and absolute synchronization
• Possible future on-board uses of Galileo and GPS
   o Position based MACs
   o Alternative TDMA approaches: the case of MS-ALOHA
     - Synchronization constraints
   o The role of certified time and position (future services)

PART 2: On-board GNSS receivers (30 min)
• GNSS: recent trends and role of Galileo
   o The basic principles of satellite navigation
   o Current status of GNSS constellations
   o Galileo: role and opportunities
• The need for GNSS position integrity and authentication in ITS
   o The growing menace of jamming and spoofing attacks
   o Other issues in urban scenarios (multipath, non-line-of-sight signals, …)
   o The classic (aviation-born) integrity approach
   o The “Local Integrity” approach
   o Anti-spoofing techniques
   o Galileo: solutions for signal authentication

PART 3: On-board integration: the GLOVE perspective (45 min)
• On-board synchronization: results
• Other types of integration: GLOVE approach
   o OBUg: Mutual positioning (collaborative positioning)
     - Proof of concept
   o OBUg: Cars as sensors for GNSS signal quality assessment
   o OBUv: possible new MAC methods
     - Visual demonstrations
   o OBU^: integration of VANET messages on the navigator
     - New non-distractive on-board HMIs
     - The role of companion devices

Intended length
2 hours

Intended audience and assumed background knowledge
The tutorial addresses typical ICCVE attendees that, according to the topics of the tutorial can be classified as: newcomers, industrial professionals and skilled researchers.
The instructors will provide details on their slides but, depending on the feedback of the audience, they will skip some of them just highlighting results - all the information will be however available through the electronic copy of slides.
In order not to bore the audience and to simplify the comprehension, several details (propagation phenomena and their impact, protocol performance, etc.) will be facilitated through examples, simulation results and, sometimes, visual animations (they have developed two Visualization tools).