CPGPTD(09)104 CPG11 PTD Helsinki 35 November 2009 Date Issued

cpgptd(09)104 cpg11 pt-d helsinki, 3-5 november 2009 date issued: 30 october 2009 source: france subject: wrc-11 ai 1.7

CPGPTD(09)104
CPG11 PT-D
Helsinki, 3-5 November 2009
Date issued: 30 October 2009
Source: France
Subject: WRC-11 AI 1.7 – Views regarding invites iv of resolution 222
Summary:
This document presents the reason why seeking for other frequency
bands for AMS(R)S is not required under AI 1.7, as long-term AMS(R)S
spectrum requirements can be accommodated in the 2x10 MHz referred to
in N° 5.357A, without placing undue constraints on existing systems.
Proposal:
CPG-PTD is invited to agree that seeking for other frequency bands for
AMS(R)S is not required under AI 1.7, and that this is reflected in
the draft Brief for AI 1.7.
Background:
1.7 to consider the results of ITU-R studies in accordance with
Resolution 222 (Rev.WRC-07) in order to ensure long-term spectrum
availability and access to spectrum necessary to meet requirements for
the aeronautical mobile-satellite (R) service, and to take appropriate
action on this subject, while retaining unchanged the generic
allocation to the mobile-satellite service in the bands 1 525-1 559
MHz and 1 626.5-1 660.5 MHz
Resolution 222 invites ITU-R:
to conduct, in time for consideration by WRC-11, the appropriate
technical, operational and regulatory studies to ensure long-term
spectrum availability for the aeronautical mobile-satellite (R)
service (AMS(R)S) including:
(iv) if the assessment identified in invites ITU-R (i) and (ii)
indicates that these requirements cannot be met, to study existing MSS
allocations or possible, new allocations only for satisfying the
requirements of the aeronautical mobile satellite (R) service for
communications with priority categories 1 to 6 of Article 44, for
global and seamless operation of civil aviation taking into account
the need to avoid undue constraints on existing systems and other
services,
Invites iv of Resolution 222 opens the possibility to study existing
MSS allocations or possible, new allocations only for satisfying the
requirements of AMS(R)S in case that:
*
long term AMS(R)S spectrum requirements are higher than 2x10 MHz
and will not fit in the current frequency bands referred to in N°
5.357A
*
any new regulatory means don’t cause undue constraints to existing
MSS networks
According to studies undertaken in WP 4C, long term (around the period
of 2025/2030) and worst case AMS(R)S spectrum requirements in Europe
will be lower than 3.3 MHz in the forward link and 1.3 MHz in the
return link and globally lower than 4.2/4.5 MHz in the forward link
and 1.6/1.8 MHz in the return link (See ITU-R draft Report M.[AMSRS
spectrum estimate], Annex 9 of the Chairman Report) which is lower
than the current 2x10 MHz given in No. 5.357A.
One could question on the meaning of undue constraints. However,
France is of the view that in the worst case a maximum of 3.3 MHz in
the forward link and 1.3 MHz in the return link for AMS(R)S, when
compared with the 40 MHz allocated to MSS in the 1.5/1,6 MHz
frequencies, is less than 10% of the total available MSS spectrum and
thus it does not constitute an undue constraint to the existing
systems. Additionally, the above studies used worst case assumptions,
which in real term mean that lower spectrum use is expected than the
one which resulted from the worst case studies. The studies also
showed that when assuming different modes of transmission (e.g.
multi-cast communications for certain type of AMS(R)S services) for
AMS(R)S systems a lower amount of spectrum is needed, i.e. in Europe
2.0 MHz in the forward link and 1.3 MHz in the return link, and
globally 2.7 MHz in the forward link and 1.6 MHz in the return link.
Furthermore, long-term use of the MSS allocation by MSS system will be
more efficient due to innovative technologies (e.g. smaller spot beam
and higher modulation) which are already being deployed. Hence, we
believe that there is no cause of undue constraints by AMS(R)S in the
long-term.
Moreover, the regulatory option proposed by France is effectively a no
change to the current Radio Regulations and will only ensure that the
priority given to AMS(R)S by N° 5.357A is put into practice. France
proposes in the revision of Resolution 222 that the actual year by
year AMS(R)S spectrum requirements are estimated by a competent
international meeting, possibly at the ITU and with the involvement of
ICAO, where all administrations and operators can attend so that they
are justified. Then France proposes that during the yearly ORM
process, operators assign in priority spectrum to AMS(R)S according to
N° 5.357A, and that concerned Administrations of MSS systems taking
part in the multilateral coordination meetings make sure that N°
5.357A is fulfilled. At the end of such meetings, the ORM participants
inform through a formal process the ITU-R that these justified AMS(R)S
spectrum requirements have been accommodated.
France is of the view that those proposals only ensure that in the
coordination process, N° 5.357A is respected, as it should already be
the case. It should be also be noted that these proposals allow the
current multilateral frequency coordination process to continue, since
it is seen to be a very important process where all operators sit
together to share diligently the spectrum resource.
France also understands that accommodating AMS(R)S spectrum
requirements will reduce the spectrum available for other MSS
operators as it is already the case today under the current MLM and
ORM arrangements, thus it is believed that the proposals made by
France will not change the current process in the spectrum
assignments. Hence, it could not be considered as an undue constraint
as it is the way it already happening today within the arrangements of
the MLM and ORM and as it is already done under the current provisions
of the footnote N° 5.357A.
Moreover, the band was made MSS generic in 1997, meaning that MSS
operators have been able to use the all MSS L-band for more than 10
years under the premises that new AMS(R)S systems will come and that
AMS(R)S spectrum requirements will grow as it is also expected of any
other MSS services.
For all the reasons explained above, France is of the view that the
long-term AMS(R)S spectrum requirements can be met in the 2x10 MHz
referred to in N° 5.357A and that this will not cause undue
constraints on existing MSS networks.
France proposes that CPG-PTD agrees that seeking for other frequency
bands for AMS(R)S is not required under AI 1.7, and that this is
reflected in the draft Brief for AI 1.7.