presentazione TTLAB

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The GAUSS Project GALILEO And UMTS Synergetic
System
Project Coordinator A. Di Fazio
(Telespazio) antonella_difazio_at_telespazio.it Pres
ented by A. Vernucci (Space Engineering) GAUSS
URL http//galileo.cs.telespazio.it/gauss
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SUMMARY

• Project overview
• Findings and Developments
• Trials
• Next milestones

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Project Overview
GAUSS
GALILEO And UMTS Synergetic System
?
RTD project co-funded by the EC-IST Programme
Duration
2 years, starting December 2000
Consortium
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Project Overview
Objectives
To 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

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Project Overview
Methodology
HISTORY
User Needs Analysis
User Requirements
Target System Definition
Demonstrator Design Development
Trial Campaign Result Evaluation
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Project Overview
Main Challenges

• To develop an advanced multi-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)

• To develop advanced and innovative applications

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Project Overview
Location-Based (i.e. integrated NAV/COM) services

• 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

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Project Overview
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

• Bursty and unbalanced traffic, with greater
  capacity requirement in the RL with respect to
  the FL

• Support of requirement for message
  acknowledgement

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Project Overview

• Highly reliable and near real-time
  communications

• 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

• 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

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Project Overview
GAUSS 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 specifically designed to
  effectively and efficiently fulfil the
  requirements of inter-modality and
  info-mobility applications (small-size messages,
  low bit rate)

• 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

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Project Overview
Basic System Design Concepts and Drivers

• 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

• Reference to current standards with regard to
  architecture, interfaces, protocols

• Use of consolidated and existing technologies as
  much as possible

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Project Overview
The GAUSS Integrated NAV/COM Reference Model
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Project Overview
GAUSS radio protocols and access scheme

• 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

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Findings and Developments
The GAUSS Demonstrator
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Findings and Developments
The GAUSS Integrated NAV/COM Message Structure

• At application level, GAUSS messages are
  formatted as cells (the GAUSS Cell),
  characterised by

• a common structure for all GAUSS services and
  applications

• fixed length(53-byte)

• 5 bytes for the header

• remaining 48 bytes constitute
• the information field
• service id
• SP/SC or MU ID
• PVT data
• auxiliary optional data

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Findings 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)

• Messages are encapsulated into an UDP segment by
  the application, before delivery to the Upper
  Layers

• A GAUSS packet comprises the GAUSS cell plus the
  overhead needed for EDC and burst preamble

• 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

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Findings and Developments
The 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

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Findings and Developments
The GAUSS User Terminal
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
? a standard graphic system for position
visualisation on digital maps
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Findings and Developments

• Innovative applications, based on GIS technology
  and exploiting the integrated satellite NAV /
  COM functions, for

• assisted river navigation
• inter-modal transport management (road/river)

• Use of consolidated open standards for
  distributed applications development
  (open-source components, standard data formats,
  protocols and interfaces)

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Trials
Components

• The ITALSAT EMS
• (European Mobile System)

• The MTB System
• (Mediterranean Test Bed)

• The Gateway Station

located at Lario (Telespazio earth station)

• The D-GPS System

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Trials

• Inter-modality scenario with inland- waterways
  as core mode of transport

• Validation of the applications with direct
  involvement of a real user and environment

• ARNI ? REGIONAL BOARD FOR
• INLAND NAVIGATION
• cargo boat loaded with hazardous
• goods (gas)

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Next Milestones
Forecoming Events

• GAUSS Demonstrator AIT finalisation (July 2002)

• Trials campaign (scheduled to start by August
  2002)

• Trial results analysis and evaluation

Thank you for your attention