3rd SADC WRC-07 MEETING 04 – 06 JUNE 2007 INDABA …
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Transcript 3rd SADC WRC-07 MEETING 04 – 06 JUNE 2007 INDABA …
Agenda Item: 1.12
Title: Extension of current worldwide
allocation to the Earth exploration–satellite
(active) service in the frequency band 9300–
9900 MHz
ITU-R Group: WP7C
RSA Rapporteur: Dr. Adrian Tiplady
Relevant
Resolution/s
RESOLUTION 651 (WRC-12)
Possible extension of the current worldwide
allocation to the Earth exploration-satellite (active)
service in the frequency band 9 300-9 900 MHz by
up to 600 MHz within the frequency bands 8 700-9
300 MHz and/or 9 900-10 500 MHz
Issues
Growing demand for increased resolution of
global environmental mapping, achieved through
increased bandwidth (600 MHz) to achieve 1.2
GHz contiguous bandwidth
Compatibility studies required to consider:
EESS(active) and existing services in bands under
consideration, to ensure protection of existing services
Unwanted OOB emissions affecting Space Research Service
in 8,400 – 8,500 MHz
Unwanted OOB emissions affecting Space Research Service,
Radio Astronomy Service and EESS (passive) in 10,600 –
10,700 MHz
Frequency Bands
under consideration
• Current worldwide allocation:
– 9,300 MHz – 9,900 MHz
• Bands under consideration:
– 8,700 MHz – 9,300 MHz
– 9,900 MHz – 10,500 MHz
Summary of Relevant
ITU SG/WP Progress
WP7C Meeting May 2014 (next in October 2014)
Preliminary reports and studies
DN ITU-R RS.[EESS-9GHz_OOBE] – Sharing between EESS (active)
and OOB emissions with the SRS in 8 400 8 500 MHz and RAS
and other passive services in 10.6-10.7 GHz.
For protection of RAS and other passive services, further mitigation
measures discussed with WP 7B (SRS) and WP 7D (RAS). APPROVED
PDN ITU-R RS.[EESS-9GHz_FS/MS/AS] – Sharing between EESS
(active) and the fixed service in bands 8 700 - 8 750 MHz and 10
000-10 500 MHz
Completed, but further questions raised regarding protection margins
for FS. APPROVAL FOR NEXT MEETING
PDN ITU-R RS.[EESS-9GHz_RDS] - Sharing of wideband EESS SAR
transmissions with stations in RDS in the bands 8 700-9 300
MHz and 9 900-10 500
Liaison statement to WP5B, indicating 8,700 – 9,200 MHz no longer
under consideration. APPROVAL FOR NEXT MEETING
Summary of Relevant
ITU SG/WP Progress
Proposed new Recommendations for Mitigation
PDN ITU-R RS.[EESS9GHz-RAS-MITIGATION] - Protection of RAS
in band 10.6-10.7 GHz from unwanted OOB from synthetic
aperture radars operating in EESS (active) around 9 600 MHz
Agreed at WP7C in close liaison with WP7D. Further discussion
required at next meeting, as various operational aspects to be
considered
PDN ITU-R RS.[EESS9GHz-SRS-MITIGATION] - Protection of SRS
space-to-earth links in the 8 400 8 450 MHz and 8 450 8 500
MHz bands from unwanted OOB from synthetic aperture radars
operating in the EESS (active) around 9 600 MHz
Agreed at WP7C in close liaison with WP7B. Further discussion
required at next meeting, due to various operational mitigation
measures and further engagement required.
Summary of Relevant
ITU SG/WP Progress
Study Highlights (Existing in-band
allocations)
Sharing between EESS & RDS
9,000 – 9,200 MHz not retained due to lack of guidance from ITU
on processing gain, and safety critical service of ARNS
As a result, 8,700 MHz – 9,000 MHz no longer considered as it
would not provide a contiguous 1,200 MHz band
9,300 MHz – 10,000 MHz already studied, indicating no
interference
10,000 MHz – 10,500 MHz may result in interference 0.00001% *
N, where N = number of systems, of time over 11 days
Sharing between EESS & FS/MS
Feasible
Sharing between EESS & Amateur RS / Amateur RSS
Very limited interference (0.004% of the time)
Summary of Relevant
ITU SG/WP Progress
Study Highlights (OOB Emissions)
Space Research Service (SRS) – 8,400 – 8,450 MHz
(deep space), 8,450 – 8,500 MHz (near earth)
For normal operations, 77dB attenuation required for deep space,
31dB attenuation required for near earth
SRS Receiver damage by:
71dB if 8,700 – 9,300 MHz
9dB if 9,000 – 9,300 MHz and 9,900 – 10,200 MHz
2dB if 9,900 – 10,500 MHz
Operational mitigation strategies exist
Radio Astronomy Service (RAS) – 10,600 – 10,700 MHz
63dB attenuation required to reduce to 2% allowable data loss
Operational mitigation strategies exist
SRS (passive) & EESS (passive) – 10,600 – 10,700 MHz
No interference expected
Method(s) to satisfy
the agenda Item
Method A - Primary EESS (active) allocation in
the frequency band 9 900-10 500 MHz.
Method A1 – Add primary allocation: Shall impose that EESS
shall not cause harmful interference to, nor claim protection
from, radio location service allocated in the frequency band 9
900-10 500 MHz. In addition, the extension band shall only be
used by EESS (active) systems requiring a bandwidth greater
than 600 MHz that cannot be accommodated in the frequency
band 9 300-9 900 MHz. The protection of radio astronomy
service in the frequency band 10.6-10.7 GHz will be ensured
through Recommendation incorporated by reference in the RR.
Method A2 - Add primary allocation, subject to inclusion of
technical and regulatory constraints in the RR: As above, but
inclusions will ensure protection for radiolocation and fixed
services (ensured through footnote in RR with pfd-limit).
Method(s) to satisfy
the agenda Item
Method B - Primary EESS (active) allocation in
the frequency bands 9 200-9 300 MHz and 9 900
10 400 MHz.
Impose that EESS (active) shall not cause harmful
interference to, nor claim protection from the radio
determination services allocated in the frequency bands 9
200-9 300 MHz and 9 900-10 400 MHz. In addition, the
extension band shall only be used by EESS (active) systems
requiring a bandwidth greater than 600 MHz that cannot
be accommodated in the frequency band 9 300-9 900 MHz.
The protection of radio astronomy service in the frequency
band 10.6-10.7 GHz will be ensured through
Recommendation incorporated by reference in the RR.
Method(s) to satisfy
the agenda Item
Method A1
Advantages
Achieves required 600 MHz for EESS
Provides explicit protection of radiolocation service
Disadvantages
None
Method A2
Advantages
As above, but also specifies provisions for protection of FS
Disadvantages
Depending on value of pfd limit, may place undue
constraints on EESS
Method(s) to satisfy
the agenda Item
Method B
Advantages
Achieves required 600 MHz for EESS
Provides an explicit requirement for protection of the
RLS and the RNS by footnote
Disadvantages
None
Preliminary SA
Position
Method A2 or B
A2 provides stronger protection
measures for radiolocation and fixed
services
B provides for explicit protection
requirement for radiolocation and
radionavigation services, whilst also
reducing potential impact as a result
of unwanted OOB emissions (larger
guard band)
Conclusion
No significant controversy
Discussions ongoing regarding
mitigation techniques
Responsibility of coordination
should be on EESS operators, not
SRS/RAS