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Earth Station on Vessels: An Update to the NSMA Spectrum Management

This presentation provides a regulatory update on Earth Stations on Vessels (ESV), including information on FCC regulations, ESV coordination in Europe, interference analysis methodologies, frequency coordination, and licensing.

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Earth Station on Vessels: An Update to the NSMA Spectrum Management

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  1. Earth Station on VesselsAn Update to the NSMA Spectrum Management 2006 Presented by Ken Ryan, Skjei Telecom May 17, 2006

  2. Earth Station on Vessel 2006 • Regulatory Update • What’s Happening in Europe • Status of U.S. ESV Coordinations • Interference Analysis Methodologies • Interference Criteria • Frequency Coordination • Licensing • Proposal for Future ESV Work

  3. Earth Station on Vessel 2006 • Regulatory Update • FCC Docket # 02-10 (FCC DA 04-286) • Released January 6, 2005 • C and Ku-band ESV Co-primary • 15 year license term • New Rule Parts • 25.221 : C-band • 25.222 : Ku-Band • No ESV licenses granted to date

  4. What’s Happening in Europe? • European Conference of Postal and Telecommunications Administrations (CEPT) paper: “Compatibility of Earth Stations on Board Vessels Transmitting Within the Gaps in the CEPT Fixed Service Channel Plan for the Lower 6 GHz Band (5926-6425 MHz)” • Interference Criteria Proposed: • Long Term (single entry) : between -10 & -19 dB (-169 dBW/4kHz, -178 dBW/4kHz) • Minimum safe distances from shore, dependent upon operating conditions. • The ESV antenna main beam axis elevation is not lower than 20°. • The ESV transmits a single carrier per HPA. • The phase noise floor of the ESV carrier does not exceed -120 dBc/Hz. • The p.s.d. of the 1st spectrum side lobe of the ESV carrier is at least 27 dB below the in-band p.s.d. • The ESV e.i.r.p. does not exceed 58 dBW. • The ESV does not transmit when the vessel speed is lower than 10 knots (18,3 km/h). • Limit ESVs to use of Band Gaps as shown in the figure on next slide:

  5. C-band CEPT 30 MHz FS Channel Plan* • Blue shaded areas indicate approximately 25 MHz spectrum is unoccupied, so-called 4% solution. • * Channel plan identical to FCC Part 101.147 i(8) for Lower 6 GHz.

  6. What’s Happening in the U.S.? • Not Much Lately… • The NSMA Examined Analysis and Coordination issues last in 1999 • Some ESVs are being coordinated at C-band • U.S. Coordinators are using the NSMA developed Critical Contour Point analysis method • Current FSS earth station long-term interference objectives are being used: -154 dBW/4 kHz • Use of band gaps being explored, although no proposals to limit ESVs to these bands is proposed • Use of real FS receiver filter curves • No consideration for the motion of the ESV

  7. A Brief Summary of the Current ESV Coordination Process • Steps Required to Coordinate: • Properly characterize the ESV • Route breakpoints • Speed* • Number of approaches* • Analyze operation versus FS systems • Frequency Coordination • Licensing * Only required for in-motion analysis

  8. Characterizing the ESV • Identifying the breakpoints is dependent upon the type of ESV service being provided • Need to identify deep-draft sea lanes • Need to go far enough out to satisfy the FCC rules (300 km) • The route of the ESV must characterize its worst case excursions

  9. Interference Criteria • ESVs currently use existing long and short term interference criteria used by all U.S. coordinated 6 GHz earth stations: • -154 dBW/4kHz long term, -131 dBW/4kHz short term • ITU and TIA documents suggest proper FSS into FS digital interference criteria is: • -146 dBW/MHz long term, -103 dBW/MHz short term • Other options include: • Fractional Degradation in Performance (FDP) criteria, 25% • Performance Degradation Limit (PDL) see TIA TSB-86, five 9’s or 25% performance degradation • Interpolated interference criteria using existing long and short term criteria calculated

  10. Interference Analysis • Currently we are using the Critical Contour Point (CCP) methodology • Current version of the CCP uses a “static” analysis, no benefit for ESV motion is considered • Other analysis approaches are discussed in ITU-R SF. 1585 and 1649 • Other methods which model the ESV motion and collect interference statistics could be examined, for digital FS systems the following three methods could be used: • Long-term objective of –146 dBW/MHz that can be exceeded only 20% of the time and a short-term objective of –103 dBW/MHz that can be exceeded only 0.002% of the time. • Fractional Degradation in Performance • Performance Degradation Limit • The above approaches involve developing interference criteria on a link-by-link basis

  11. Critical Contour Point

  12. Collect Interference Statistics

  13. Digital FS Interference Criteria Interference Objective = Imax - d

  14. Fractional Degradation in Performance Where: Ii: Linear value of ith interference level. fi: Fraction of time interference from ESV is between the ith interference level and the (i + 1)the interference level NT: Linear value of thermal noise level. In order to account for the 1-dB noise degradation objective as suggested by TIA TSB 10-F, the interference objective is: Imax – FDP – 5.86 (dB).

  15. Fractional Degradation in Performance

  16. Fractional Degradation in Performance

  17. Performance Degradation Limit

  18. Frequency Coordination • Process is offshoot of the process developed by the NSMA 6 years ago and is very similar to current coordination model • Provide route and ESV parameters • Currently use the Critical Contour Point analysis method • PCN data is used by other licensees to analyze interference • Incumbent licensees generate cases and response • Coordinator resolves cases in response letter

  19. Licensing • ESV licensee files an initial filing outlining hub and remote parameters • License is a network license essentially providing a blanket authorization for the remote ESVs • Licensee is required to submit a prior coordination showing for each ESV coordinated • ESV is considered licensed once the coordination final report is submitted to the FCC

  20. Proposals for Future Work • Finalize PCN data format and content recommendation • Review international ESV work done, both ITU and CEPT • Examine use of band edge segments for ESV use • Interference analysis methods and criteria for in-motion ESVs • Establishment of an NSMA working group to come to a consensus on these issues, so that ESVs can more easily and realistically be analyzed and coordinated

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