The System Testbed will be used to validate the work of the HeliNet project, by testing
several possible broadband applications and services selected in workpackage 1 to a fixed user.
Additionally it will be used to provide vital measurement data for the more advanced high-speed
train applications, and to more accurately characterise the propagation environment for the
Three alternative aerial platform technologies are envisaged for the System Testbed.
To support this a common test/measurement methodology will be developed in order to maximise the
coordination and use of common equipment and maximise the applicability of the different measurement data.
The aerial platforms envisaged are:
Test Session 1 - a set of tests (over several weeks) with a 300m altitude 15m tethered aerostat (UK)
- Broadband FWA up to 120Mbit/s to a fixed user (see Figure 4) using 28GHz band.
- Demonstration of end-to-end network connectivity.
- Demonstration of services such as: high speed internet, video-on-demand.
- Assessment of the suitability of the tethered aerostat technology to deliver "Broadband for All"
in its own right.
- Optical communications - HAP ground - wide beamwidth - check suitability for backhaul comms up
to 622Mbit/s (see Figure 6), + comparison with Japanese equipment (subject to payload constraints).
- Propagation measurements for fixed and mobile scenarios at 28GHz. Particularly examining multipath
(from near to ground objects) and doppler. We see this as essential for any array based technologies.
Effect of scintillation around the edges of clouds will be assessed if time/conditions permits.
Test Session 2 - Stratospheric Balloon test (Sweden or Italy) - short term mission - several hours
- BFWA - selection of those trials done at 300m. This will use the
28/31GHz bands if possible, or alternatively 47/48GHz bands – this will
depend on receiving the appropriate radio regulatory clearances. The
scope of this will be subject to the station-keeping characteristics of
the balloon, balloons payload capabilities and make up of the
communications equipment (Figure 5)
- Propagation measurements, including possible scintillation on edge of clouds
- Optical Communications
- High rate backhaul link test 622Mbit/s (including BER). Test
of pointing acquisition and tracking (PAT) equipment (see Figure 6)
- Results comparison with equivalent Japanese trial
Test Session 3 - Japanese trial(s) – part of the ongoing trial programme by CRL
- Details to be negotiated (during project). CRL will sign a
Memorandum of Agreement (see Appendix B) with UOY and have agreed in
principle to support the CAPANINA project by sharing their trial data
and offering their trial equipment. They have access to HAP equipment
and will be performing broadband trials in future years.