FINAL REPORT - Stakeholders - Ofcom
FINAL REPORT - Stakeholders - Ofcom
FINAL REPORT - Stakeholders - Ofcom
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Encourage move of HF voice to HFDL More efficient use of current<br />
HF channels<br />
Use Satcom to replace HFDL High cost of satellite<br />
communication makes this<br />
unlikely in the short term<br />
Transfer ACARS to VDL2 10 fold increase in VHF<br />
channel utilisation<br />
Move ATIS to digital ATIS on VDL Mode<br />
2<br />
Move some ATS controller pilot dialogue<br />
to data on VDL Mode 2<br />
Investigate more efficient ways of<br />
allocating analogue channels as<br />
communications move to data<br />
Free up UHF spectrum by moving<br />
surface vehicles to VHF<br />
Remove requirement for some<br />
VHF voice channels<br />
Little effect on spectrum (in<br />
fact need spectrum at top of<br />
voice band)<br />
A key issue – as voice moves<br />
to data, voice channel<br />
utilisation becomes very low –<br />
how can this be taken<br />
advantage of?<br />
Makes it possible to introduce<br />
new services into UHF<br />
spectrum<br />
Wholescale movement of current analogue services to digital<br />
Move voice to VDL Mode 3 Provides up to 4 voice<br />
channels per 25kHz channel<br />
Move communication to VDL Mode 4 More efficient than current<br />
VHF communication<br />
Reconsider Mode S datalink Potential to introduce data link<br />
into an existing part of the<br />
spectrum reducing overload<br />
elsewhere (i.e. in VHF<br />
spectrum)<br />
Establish new satellite services including<br />
NGSS and SDLS<br />
Introduce broadband services in existing<br />
spectrum (VHF or L band)<br />
Not possible to determine at<br />
this stage<br />
Potential for highly efficient<br />
system in VHF band<br />
Share services over WiFi (Gatelink) Aviation benefits from<br />
commercially allocated<br />
spectrum, reducing pressure<br />
on spectrum elsewhere<br />
Piggy back ATS services on to satellite<br />
commercial services (e.g. future AMSS,<br />
Boeing Connexion)<br />
Not possible to determine at<br />
this stage<br />
Note that VDL 2 is not<br />
particularly efficient for two way<br />
point to point communication<br />
because of its random access<br />
protocol and need for guard<br />
bands<br />
Will become possible as VDL<br />
Mode 2 is introduced<br />
VDL2 not a long term solution for<br />
CPDLC because of random<br />
access protocol and no support<br />
for priority<br />
Open ended requiring more<br />
investigation<br />
Currently happening at some<br />
airports (e.g. Heathrow)<br />
Unlikely to offer many<br />
advantages over 8.33kHz<br />
channelisation and hence<br />
implementation considered<br />
unlikely<br />
Spectrum efficiency still to be<br />
proven<br />
Mode S data link has been<br />
considered and rejected in the<br />
passed by the community.<br />
However, there is some<br />
possibility that it could be reconsidered<br />
on the back of the roll<br />
out of the Mode S surveillance<br />
ground infrastructure.<br />
Development should emphasise<br />
spectrum efficiency<br />
New system, implementation in<br />
VHF requires clearing out of old<br />
VHF services<br />
In L band, would require proof<br />
that services could be provided<br />
at an attractive price<br />
Airport authorities actively<br />
planning to expand WiFi services<br />
Driven by reduced marginal<br />
costs.<br />
Mixing safety critical and nonsafety<br />
critical on the same<br />
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