Post on 27-Mar-2015
The GAUSS ProjectThe GAUSS ProjectGGALILEO AAnd UUMTS SSynergetic SSystem
Project Coordinator: A. Di Fazio (Telespazio)antonella_difazio@telespazio.it
Presented by A. Vernucci (Space Engineering)
GAUSS URL: http://galileo.cs.telespazio.it/gauss
SUMMARYSUMMARY
Project overview
Findings and Developments
Trials
Next milestones
RTD project co-funded by the EC-IST ProgrammeGAUSSGAUSS GGALILEO AAnd UUMTS SSynergetic SSystem
2 years, starting December 2000DurationDuration
ConsortiumConsortium
Project OverviewProject Overview
ObjectivesObjectivesTo provide enhanced Location-Based services for Info-mobility and Inter-modality applications, by the integration of Satellite Navigation and Communications functions.
Main project aims are:
To study and assess the GAUSS reference model, integrating NAV (GALILEO) and COM (S-UMTS-compatible) functions (the GAUSS Target System)
To demonstrate the GAUSS approach by exploiting existing facilities and performing new developments where required (the GAUSS Demonstrator)
To contribute in the standardisation process, with regard to both Galileo and UMTS
Project OverviewProject Overview
Project OverviewProject Overview
HISTORY
MethodologyMethodology
User NeedsAnalysis
User
Requirements
Trial Campaign & Result Evaluation
“Demonstrator”Design &
Development
Jun 01 Sep 02 Dec 02Dec 00 Sept 01 Feb 02 Jul 02
Realistic implementation of the GAUSS model, based on: existing infrastructures
available standard Navigation Satellite Systems (the Mediterranean Test Bed - MTB) for positioning
a GEO satellite payload (EMS) for communication
the Gateway Station located at LARIO (owned by Telespazio)
new hardware and software:
an advanced multi-mode Mobile Terminal
a low-rate S-UMTS-compatible access system
innovative applications using GIS technology
GAUSS future solution, integrating: Galileo for Navigation S-UMTS for Communications
“Target System”Definition
Main ChallengesMain Challenges
To develop advanced and innovative applicationsapplications
To develop an advanced n advanced multi-mode user terminalmulti-mode user terminal handling, in integrated manner, the COM and the NAV signals appearing in:
the S-UMTS band (COM signal) the GPS, EGNOS and GALILEO bands (NAV signal)
To specify and implement an access system tailored upon location-based services (requiring low-capacity and bursty resources) and featuring maximum commonalties with the emerging S-UMTS standard (W-CDMA)
Project OverviewProject Overview
GAUSS ServicesGAUSS Services
Location-Based (i.e. integrated NAV/COM) services
integrity and high accuracy (1-5m) (for Navigation)
global coverage, high reliability and continuity,quasi real-time (for Communications)
Characterised by the following requirements:
very great number of Mobile Users (MUs) for each Service Provider (SP) and Service Centre (SC)
Messages originating from MU always carry Position-Velocity & Timing (PVT) data
Project OverviewProject Overview
Bursty and unbalanced traffic, with greater capacity requirement in the RL with respect to the FL
Services handled by GAUSS typically feature:
Two-way messages exchange between MUs and SPs/SCs
Low-bit rate transmission by the MUs of small data packets carrying accurate position and timing data
either periodically or asynchronously (e.g. upon request or following an event)
Messages can be generated:
Support of requirement for message acknowledgement
Project OverviewProject Overview
point-to-point (P-to-P),MU SP (NAV related messages)SP MU (service provisioning messages or ACK)
broad (B)-casting, SP all MU/subscribers broad-catching, SP all MU/subscribers multi (M)-casting, SP a group/set of MU multi-catching, SP a group/set of MU
Highly reliable and near real-time communications:
Service features: 1% - message loss probability 8 * 424 bit - maximum message size 1 msg/sec. - maximum message transmission rate 0.85 sec. - message transmission time 1% - blocking probability at busy hour
Project OverviewProject Overview
GAUSS Approach vs. S-UMTSGAUSS Approach vs. S-UMTS
The GAUSS system:
is conceived to constitute one of the UMTS RANs, optimized for the provision of location-based services
The GAUSS RAN is envisioned as fully integrated within the overall UMTS, not a competitor:
standard interfaces to the UMTS CN to be possibly complemented by other via-satellite RANs for supporting higher traffic levels and bit-rates
the GAUSS RAN is specifically designed to effectively and efficiently fulfil the requirements of inter-modality and info-mobility applications (small-size messages, low bit rate)
Project OverviewProject Overview
Tight integration & harmonisation between the 3G mobile networks and the GAUSS satellite component supporting the NAV/COM services:
Common Core Network, but distinct Radio Access Networks
Single User Terminal (dual mode) for Satellite and Terrestrial access
Basic System Design Concepts and Drivers
Reference to current standards with regard to architecture, interfaces, protocols
Use of consolidated and existing technologies as much as possible
Project OverviewProject Overview
The GAUSS Integrated NAV/COM Reference Model
Project OverviewProject Overview
Designed for maximum consistency with emerging S-UMTS standards
Adaptations required to best suit a service environment characterized by:
many MTs featuring very low activity highly-bursty low-rate communications support of broad/multi-casting communications transmission of structured short data packets
GAUSS radio protocols and access scheme
Project OverviewProject Overview
The GAUSS Demonstrator
Findings and DevelopmentsFindings and Developments
The GAUSS Integrated NAV/COM Message Structure
remaining 48 bytes constitute the information field:
service id SP/SC or MU ID PVT data auxiliary optional data
5 bytes for the header
fixed length(53-byte)
a common structure for all GAUSS services and applications
At application level, GAUSS messages are formatted as cells (the GAUSS CellGAUSS Cell), characterised by:
8 B I T S 1 H
1 S E R V I C E - E
2 I D S E R V A3 I C E - P R O V D
4 I D AR EA I D E5 A U X . D A T A R
6 S U B DH E A D E R A
TA
P V T + O T H E FR - I N F O . L
48 D
Findings and DevelopmentsFindings and Developments
GAUSS applications typically require transmission of just 1 cell. Longer messages are anyway also supported, by concatenating up to 8 cells (424 bytes)
A GAUSS packet comprises the GAUSS cell plus the overhead needed for EDC and burst preamble
Messages are encapsulated into an UDP segment by the application, before delivery to the Upper Layers
The GAUSS message format is flexible, and capable of supporting virtually all kinds of message-based services (e.g., the so-called SAR services), in addition to those demonstrated within GAUSS
Findings and DevelopmentsFindings and Developments
The GAUSS S-UMTS compatible access systemThe GAUSS S-UMTS compatible access system• The GAUSS access system was developed with regard to specifications being currently considered for S-UMTS
• Access is based on SW-CDMA: Forward Link: a solution close to DSCH approach specified by 3GPP Return Link: a reservation-based approach, based upon synchronous CDMA (GPS-assisted), with requests in slotted Aloha
Findings and DevelopmentsFindings and Developments
R A N RR A 2R A 1 ... D ata
T res T D
T R
tim e
The GAUSS User Terminal
a standard graphic system for position visualisation on digital maps
An multi-mode Mobile Terminal breadboard is being produced,comprising both ad-hoc developments and off-the-shelf items, i.e.:
an integrated NAV / COM digital receive front-end, able to de-multiplex: the NAV signals:
the current GPS signal simulated Galileo signals (E1 + E5)
and the COM signal, in the S-UMTS band
for COM: a transmit front-end, and a baseband & control section operating on CDMA and supporting the upper protocol layers
for NAV: a navigation receiver
Findings and DevelopmentsFindings and Developments
Innovative applications, based on GIS technology and exploiting the integrated satellite NAV / COM functions, for:
Use of consolidated open standards for distributed applications development (open-source components, standard data formats, protocols and interfaces)
assisted river navigation
inter-modal transport management (road/river)
The GAUSS Applications
Findings and DevelopmentsFindings and Developments
TrialsTrials
Components
The The Gateway StationGateway Stationlocated at Lario (Telespazio earth station)
The The User TerminalUser Terminal Installed on a vesseland on a car
The The Service SegmentService Segment the Service Centre the Authority the Service Provider
The The D-GPS SystemD-GPS System
The The MTB System MTB System (Mediterranean Test Bed)
The The Access SystemAccess SystemLow-rate, S-UMTS compatible
The The ITALSAT EMSITALSAT EMS(European Mobile System)
Inter-modality scenario with inland- waterways as core mode of transport
ARNIARNI
ARNI REGIONAL BOARD FOR
INLAND NAVIGATION
cargo boat loaded with hazardous goods (gas)
Validation of the applications with direct involvement of a real user and environment:
TrialsTrials
Next MilestonesNext Milestones
Forecoming Events
GAUSS Demonstrator AIT finalisation (July 2002)
Trial results analysis and evaluation
Trials campaign (scheduled to start by August 2002)
Thank you for your attention…