Project objectives
The objectives of MOWGLY are to solve the most significant and critical technical issues prerequisite to development, deployment and evolution of a broadband access satellite architecture for collective mobile users.
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The technical objectives are:
To provide an cost effective collective mobile terminal
- Antenna solutions (mechanical steering antenna subsystem)
The special Requirements of the antenna system are:
• Size of the system, especially the radome height protruding from the aircraft
• Antenna system performance, regarding the Gain, in order to meet the Link Budget/Data Rates requirements
• Regulations regarding the Antenna system performance, mainly Side-Lobes and Cross Polarization
- Optimisation of on board network architecture maximizing reuse of already qualified equipment. On board and ground equipments will be based as much as possible on existing airborne qualified hardware in order to concentrate the research efforts on the innovative technology aspects.
To efficiently use of the spectrum and of system resources:
- The use of the DVB-S2 (flexible advance coding and modulation scheme) standard will reduce significantly the satellite capacity required and thus the associated transmission costs.
- The use of dynamic data rate and adaptive coding (DRA) on the return link (terminals to the Hub) and introduction of lower data rates securing the link will allow the use of smaller antennas, thus reducing the cost of the installation.
- The use of IP QOS and SLA advanced features will allow to assign priorities between different service flows taking into account real times services like VoIP and non real time services like file transfer. Compared to what is proposed by the competition, these features will be real advantages for the relation between the service provider and the end-user but also between the service provider and the access network operator;
To support mobility of the terminal and user
- The Synchronization mechanisms to counteract Doppler and multi-paths effects will be analysed, studied, developed and implemented at both gateways and terminals levels. From this work, the consortium will be able to propose enhancements to be made to the DVB-S2, DVB-RCS standards to make them adapted for mobile satellite terminals.
- The Hand-over mechanisms (at physical and IP layer) for terminal mobility between spots, satellites and gateways will be investigated, in order to maintain QoS to the users.
- The On board routing & End to End features (security, performance proxy, QoS, billing, authentication ….) will also be addressed during this project.
To achieve its objectives, MOWGLY has adopted a 3-step approach:
1. Economical and usage analysis, leading to mission requirements and business case
2. Engineering study to define system architectures and establish development plan
3. Development and field trial experimentation of the communication chain
These 3 steps will be performed for the three targeted transportation means: aircraft, train and vessel.
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To achieve competitiveness and early market penetration, MOWGLY will be based on:
- DVB-S2, DVB-RCS broadband access standards. MOWGLY will produce technical analysis for the extension of these standards to mobile applications.
- Maximization of the re-use of fixed broadband satellite infrastructure:
- For the space segment via use of existing satellite capacity and coverage at Ku band to achieve early roll-out but with synergy to future system evolutions operating in Ka band to provide additional capacity and more cost effective systems. MOWGLY will develop versatile Ku/Ka collective mobile onboard antenna.
- For the Hub (satellite gateway) also deployed for fixed satellite broadband services
- Specific mobility development: MOWGLY will develop a prototype modem able to compensate the mobility characteristics of the physical layer and will update the hub to take into account handover features.
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