FINAL REPORT - Stakeholders - Ofcom

Parameter Value Notes
ATN compliance No Current systems being implemented are based
on TCP/IP and are not ATN compliant. The ICAO
ATN Manual contains provisions for previous
Gatelink solutions – but not WACS as considered
here.
Frequency band 2.4 GHz, Other potential systems at 5.2 GHz, 5.8 GHz and
17.1 GHz
RF Channels Single channel
Modulation scheme Frequency Hopping
Spread Spectrum
(FHSS) and Direct
Sequence Spread
Spectrum (DSSS)
Bit rate 2.4 GHz FHSS:
Current systems have a
rate of 1-2 Mbps
2.4 GHz DSSS:
Bit rate on current
systems is 2 Mbps – in
future this may be
increased to 11 Mbps
Other Systems:
5.2 and 5.8 GHz:
Bit rates of up to 20 Mbps are expected
17.1 GHz:
Bit rates of up to 150 Mbps are expected
Channel access method CSMA-CA, TDMA Systems complying with IEEE 802.11a (5 GHz
systems) and 802.11b (2.4 GHz systems) use
Carrier Sense Multiple Access with Collision
Avoidance (CSMA-CA)
Frequency availability
(allocation status)
Dependencies None
Frequencies allocated
worldwide and available
Table 5- 9 Characteristics of Gatelink
HiperLAN systems (5 GHz systems) use Time
Division Multiple Access TDMA
Frequencies at 2.4 GHz are available worldwide
for use by WACS/Gatelink and do not require a
licence.
At 5.2 GHz, there are worldwide frequencies
available which do not require a licence.
At 17.1 GHz, allocation is worldwide but users
require a licence for a particular geographical
area.
5.9.2 Transfer to commercial data links
The increase in requirements for passenger services (IFE etc) drives the provision of new
high data rate links (particularly for uplink services). An opportunity for ATS
communication is to piggy back on top of these services. The advantage is that
passenger services will be commercially driven with separate business cases providing a
low marginal cost route for ATS. The drawbacks include the lack of precedent for sharing
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