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3.4.6.6 L-Band DME
EUROCONTROL’s navigation strategy calls for further provision of DMEs to enhance
coverage. Roughly 230 DMEs are forecast to be needed in core Europe to ensure full
coverage for RNP-RNAV operations.
3.4.6.7 L-Band GNSS
The introduction of new augmentation systems (such as EGNOS), in addition to extra
GNSS satellites being launched (GPS2, Galileo), will see greater usage of the allocated
bands. The overall power of each of these systems is likely to increase; plans already
exist for GPS L1 and L2 signals to increase in power.
3.4.7 Possible New Technologies (in-band)
3.4.7.1 Loran-C
Not applicable.
3.4.7.2 NDB
None known.
3.4.7.3 Marker Beacons
Not applicable.
3.4.7.4 ILS
The 108-117.975 MHz band is currently shared between ILS/VORs (108-111.975 MHz)
and stand-alone VORs (112-117.975 MHz). ICAO proposes to allow the future allocation
of the ILS portion of the band to GNSS ground-based augmentation services (GBAS) and
VHF Datalink (VDL Mode 4). GBAS would probably be co-located with ILS equipment for
the foreseeable future – regulation may therefore be necessary to ensure appropriate
allocations are given to each technology such that interference is kept to a minimum.
A new resolution from WRC 2003 provided the approval for the use of aeronautical
mobile radionavigation services in this band – namely VHF Data Link Mode 4.
3.4.7.5 VHF VOR
In common with ILS (see above), VORs may be affected by potential changes to the
Radio Regulations to allow aeronautical mobile radionavigation services to be allocated to
the band on a primary basis. As such, VDL Mode 4 may impact upon the frequency
congestion if it is introduced as planned in the medium-term.
More information on VHF Datalink Mode 4 can be found in section 5.
3.4.7.6 C-Band MLS
HiperLAN – High Performance Radio Local Area Network – has been ratified by CEPT
and the ITU for use on a non-interfering non-protected secondary basis at 5150-5250
MHz. This may be extended to 5350MHz in the future.
In addition, 5091-5150 MHz is shared with non-geostationary satellite systems in the
mobile satellite service. It should be noted that WRC-03 modified Radio Regulation
footnotes 5.444 & 5.444A and Resolution 114 (Rev.WRC-03) which relates to this band.
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