ASIA-PACIFIC TELECOMMUNITY
The 4th Meeting of the APT Conference Preparatory
Group for WRC-15 (APG15-4)
09 – 14 February 2015, Bangkok, Thailand
Document
APG15-4 /INP-18
09 February 2015
Korea (Republic of)
PRELIMINARY VIEWS ON WRC-15 AGENDA ITEMS 1.5, 1.16, 1.17 AND
1.18
Agenda item 1.5: to consider the use of frequency bands allocated to the fixed-satellite service
not subject to Appendices 30, 30A and 30B for the control and non-payload communications of
unmanned aircraft systems (UAS) in non-segregated airspaces, in accordance with Resolution
153 (WRC-12) ;
Resolution 153 (WRC-12) – To consider the use of frequency bands allocated to the fixedsatellite service not subject to Appendices 30, 30A and 30B for the control and non-payload
communications of unmanned aircraft systems in non-segregated airspaces
1. Background
The demands of unmanned aircraft system (UAS) have dramatically increased for using a large
variety of applications in the fields of industry, public safety and science. UA operations have
been restricted to segregated airspaces currently. However, it is planned to extend the UA
operation in non-segregated airspaces to facilitate for the further development of UA
application. It is necessary to take into account a seamless communication link between UA and
remote control station for safe flight operation of UA in non-segregated airspaces.
Report ITU-R M.2171 identified the spectrum requirements for the UA control and non-payload
communications (CNPC) in the both line of sight (LOS) and beyond line of sight (BLOS). In
aspect of WRC, it is required to address BLOS requirements for the CNPC of UAS as only LOS
requirement was addressed at WRC-12.
WRC-12 Agenda item 1.5 was adopted to take the necessary regulatory action to support the use
of fixed-satellite service (FSS) bands for the CNPC of UAS in non-segregated airspace and two
Methods are developed to satisfy this agenda item in the draft CPM Report: Method A is
proposed that provision in Radio Regulations should be added for using FSS for UAS CNPC
applications. Method B is also proposed there is no need to change the Radio Regulations. The
section 3/1.5/6.1 provides example of modification to Table of Frequency Allocation in the band
14-14.25 GHz based on Method A and also addresses note as follows:
The footnote in the example above could be applied to those frequency bands allocated to the
FSS and not subject to RR Appendix 30, 30A, or 30B for which studies have been conducted
in the frequency ranges 10.95-14.5 GHz, 17.8-20.2 GHz and 27.5-30 GHz.
These bands, or some part of, 10.95-14.5 GHz, 17.8-20.2 GHz and 27.5-30 GHz are already
allocated to mobile service and fixed service on a primary basis, however compatibility study
results in these bands between UAS CNPC and land mobile service are not included in the
Contact:
SHIM, YONG-SUP
National Radio Research Agency,
Ministry of Science, ICT and Future Planning,
Republic of Korea
Email: wave0908@msip.go.kr
APG15-4/INP-18
Report ITU-R M.[UAS-FSS], the reason is that since no technical characteristics of land mobile
system which have been identified in those frequency bands. It may be difficult to introduce
UAS CNPC in these bands taking into account no compatibility studies. Therefore, the bands
which were not completed compatibility studies should be excluded from considered frequency
bands. It is noted that ITU-R WP5D is developing the Report ITU-R M.[IMT. ABOVE 6 GHz]
on the technical feasibility of IMT in the bands above 6 GHz (att. 5.5 in Document 5D/836) and
this Report includes some measurement/test results in the bands 28 GHz, 39 GHz, 60 GHz and
72 GHz, etc.
2. Preliminary views
The Republic of Korea is of the view that the bands which were not conducted compatibility
studies should be excluded from considered frequency bands and proposes to delete note below
the example of modification to Table of Frequency Allocations.
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Agenda Item 1.16: To consider regulatory provisions and spectrum allocations to enable
possible new Automatic Identification System (AIS) technology applications and possible new
applications to improve maritime radiocommunication in accordance with Resolution 360
(WRC-12)
1. Background:
Resolution 360 (WRC-12) resolves to invite WRC-15
1
to consider, based on the results of ITU-R studies, modifications to the Radio Regulations
(RR), including possible spectrum allocations, to enable new AIS terrestrial and satellite
applications, with ensuring that these applications will not degrade the current AIS
operations and other existing services;
2
to consider, based on the results of ITU-R studies, additional or new applications for
maritime Radiocommunication within existing maritime mobile and mobile-satellite service
allocations, and if necessary to take appropriate regulatory measures.
1.1 Automatic Identification System
The Automatic Identification System (AIS) is a proven maritime data system, with a large
number of ships equipped and a supporting terrestrial and satellite infrastructure established. The
AIS is designed mainly for navigation, with top priority on vessel collision avoidance. The
shipborne automatic identification system, mandated under Chapter V of the international
convention for the safety of life at sea (SOLAS), has become well accepted by the maritime
community and is also being used by thousands of ships not subject to the SOLAS Convention.
The AIS is supported by a large shore based VHF infrastructure as well as being able to be
detected by satellite. The AIS is routinely used by ships for navigation and crew familiarity is a
positive factor. AIS messages can be sent with a priority #1 (highest) through #4 (lowest).
Critical link management messages including position report messages are the highest priority
(priority #1), safety related messages are the high service priority (priority #2), and some of the
other messages including application-specific messages (ASM) are the lowest priority (priority
#4). It is recognized that the establishment of the maritime AIS offers potential enhancements to
VHF maritime safety communications.
1.2 AIS VHF Data Link Loading
Heavy use of AIS by thousands of vessels results in that the existing AIS 1 and AIS 2 channels
are over loaded with increasing demand for maritime VHF data communications.
So far, some Administrations reported that the AIS VHF Data Link (VDL) loading in high
traffic area is nearing or has already exceeded critical limiting factor of 50 % as noted in IALA
Recommendation A-124 Appendix 18 “VDL Loading Management” to ITU-R Working Party
5B (WP 5B), ITU-R; Japan – 38 % with increase of 10 % within four years, Korea – 40 %. A
preliminary study conducted in China in the middle of 2012 showed the occupancy rate of AIS1
and AIS2 frequencies was in average about 30% in some of the busiest area such as Shanghai
port and Bohai Bay. In rush hours, the occupancy might reach up to 40%. These data indicates
the necessity of additional channels for the AIS.
1.3 VHF Data Exchange concept
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The main activity relating to resolves 1 and resolves 2 in Resolution 360 (WRC-12) relates to a
new concept called the VHF Data Exchange System (VDES) proposed by the International
Association of Marine Aids to Navigation and Lighthouse Authorities (IALA). Initially
proposed as a terrestrial system, with a possible satellite broadcast capability (space-to-Earth)
and called VDE, the current proposal includes transmit capability from ships (and other stations)
to satellites (Earth-to-space) on certain VHF Appendix 18 channels, through VDES. The
satellites could be in low Earth orbits and/or medium Earth orbits. It is important to note that
existing channels Automatic Identification System (AIS) 1 and AIS 2, and channels 75 and 76 as
used for the transmission of Message 27 (long-range broadcast Message) are all included in the
VDES plan, and that AIS itself, will play a crucial role, as will the Global Navigation Satellite
System (GNSS).
At this time, WP 5B discusses reservation of AIS 1 and AIS 2 channels for their original
purpose of safety of navigation, position reporting and identification, in both the ship-to-ship
and ship-to-shore and shore-to-ship direction and the use of upper legs of the duplex channels 27
and 28 in Appendix 18 of the RR for all non-navigation AIS messages.
2. Preliminary Views:
-
Supports ITU-R studies towards new applications using the Automatic Identification
System (AIS) and enhanced maritime radiocommunications in the maritime mobile service
in accordance with Resolution 360 (WRC-12).
-
No modifications are required to existing AIS equipment on board existing vessels, but
rather allow for new applications using AIS technology to evolve, supported by
communication primarily on the new frequencies identified by WRC-12, while protecting
the integrity of the original operational purpose of AIS as the primary function on the
existing AIS frequencies.
-
That the frequency band identified to VDES should accommodate the expected future AIS
VDL loading.
-
Supports the frequency bands identified by WRC-12 for digital modulation could be
considered as possible candidates for the global and regional channel allocation for VDE.
-
Any new allocation for the future applications, including satellite application, to the
frequency bands listed in the Appendix 18 should be based on issued ITU-R
Recommendation(s) to contain on gap analysis, sharing and compatibility, experiments and
tests, applications, system architecture, characteristics, shipborne equipment standards,
performance or managing requirements, etc..
-
Transitional arrangements are required to minimize the impact of use of new
applications on the existing services using frequencies listed in the Appendix 18. The
VDES equipment should provide backwards compatibility for existing AIS, the
installation costs should be minimized and the proper transitional period should be
considered.
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APG15-4/INP-18
-
APT Members support Methods in DRAFT CPM Report in order to enable possible
new Automatic Identification System(AIS) technology applications and possible new
applications to improve maritime radiocommunication in accordance with Resolution
360(WRC-12) as follows:

Application specific message designation (Issue A) : Method A1 – Channels 2027
and 2028 will be assigned for the ASM application.

New applications for maritime radiocommunication – terrestrial component
(Issue B) : Method B1 : It is proposed to identify the following duplex channels of
RR Appendix 18: 24, 84, 25 and 85.

VDES regional solution(Issue D) : Method D : Channel 80, 21, 81, 22, 82, 23 and
83 are available in some Regions as follows
- Channels 80, 21, 81, 22, 82, 23, 83 can be used using multiple 25 kHz
contiguous channels for both ship and coast station transmission as regional use.
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APG15-4/INP-18
Agenda item 1.17: to consider possible spectrum requirements and regulatory actions,
including appropriate aeronautical allocations, to support wireless avionics intracommunications (WAIC), in accordance with Resolution 423 (WRC-12)
Resolution 423 (WRC-12) – Consideration of regulatory actions, including allocations, to
support Wireless Avionics Intra-Communications
1. Background
The demands for using airline have dramatically increased in aerospace industry and more costefficient, safe, reliable aircraft is required. To achieve these goals, wireless technologies on the
aircraft is attractive as providing structural benefits and cost savings.
Wireless avionics intra-communications (WAIC) systems make use of radio communications
between two or more stations on a single aircraft; consisting of on-board networks supporting
the operation of the aircraft. The WAIC systems provide communications within a single aircraft
but may not be limited to the interior of the aircraft structure, depending on the type of aircraft.
However, WAIC systems do not provide communications between an aircraft and the ground,
another aircraft or a satellite.
As WRC-12 approved agenda item 1.17, this agenda item considers the spectrum requirements
as described in Report ITU-R M.2283. This Report concludes that 145 MHz of bandwidth is
required to implement WAIC. Also, regulatory action to support WAIC system is discussed.
The frequency bands 960 MHz-15.7 GHz containing aeronautical mobile (route) service
(AM(R)S), aeronautical mobile service (AMS), aeronautical radio navigation service (ARNS)
allocation is studied for compatibility between WAIC systems and systems operating under an
allocation to an incumbent service in accordance with Resolution 423(WRC-12).
For the possible spectrum requirements to the WAIC systems, ITU-R WP 5B studied on the
compatibility between WAIC systems and existing services in candidate frequency bands. In the
draft CPM text on this agenda item developed by WP 5B, only frequency bands 4200-4400
MHz is compatible with existing services based on compatibility studies.
Two methods are proposed to address the agenda item. One is method A that adds a new
allocation AM(R)S for WAIC in the frequency bands 4200-4400 MHz with options for an
accompanying Resolution. The other one is method B that provides same allocation with
Method A but it is referenced by ITU-R Recommendation.
2. Preliminary views
The Republic of Korea supports a new allocation to AM(R)S for WAIC in the frequency bands
4200-4400 MHz.
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APG15-4/INP-18
Agenda item 1.18: to consider a primary allocation to the radiolocation service for automotive
applications in the 77.5-78.0 GHz frequency band in accordance with Resolution 654 (WRC-12)
Resolution 654 (WRC-12) – Allocation of the band 77.5-78 GHz to the radiolocation service to
support automotive short-range high-resolution radar operations
1. Background
There has been significant growth in using radiolocation service (RLS) due to high demand of
consumers for safety in the field of automobile. It can prevent a number of traffic accidents by
using collision avoidance technology and also, can facilitate the construction of intelligent
transport systems (ITS).
Agenda item 1.18 was approved to consider a primary allocation in the frequency band 77.5-78
GHz to the radiolocation service (RLS) for automotive applications in accordance with
Resolution 654(WRC-12) at WRC-12. Resolution 654 invites ITU-R to conduct the appropriate
technical, operational and regulatory studies including sharing and compatibility studies taking
into account incumbent services and existing uses of the frequency band 77.5-78 GHz.
The Report ITU-R M.[AUTOMOTIVE RADARS] provide sharing studies between the
automotive radars and incumbent services in the frequency range 76-81 GHz. Systems
characteristics of automotive radars for sharing studies are obtained from Recommendation ITUR M.2057.
There are two methods to provide a primary allocation to the RLS in frequency band 77.5-78
GHz on a worldwide basis. Method A limits the use of the new allocation to automotive
application. Method B supports the unrestricted use of automotive radars operation.
2. Preliminary views
The Republic of Korea supports the method A that add a primary allocation to the RLS on a
worldwide basis, limited to automotive applications, between 77.5 GHz and 78 GHz as
compatibility studies were not performed enough to support the method B.
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