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AFI Spectrum Management Seminar: HF Planning Issues in AFI Region

Explore HF congestion and mobile communication coverage in AFI region with insights from the 2000 survey. Learn about the NAFISAT network and improvements for air-ground communications.

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AFI Spectrum Management Seminar: HF Planning Issues in AFI Region

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  1. Agenda Item 8: HF Planning issues in AFI Presented by Mary Obeng RO/CNS, ICAO Dakar International Civil Aviation OrganisationMiddle East OfficeSeminar on Aeronautical Spectrum ManagementCairo 4-6 June 2006

  2. INTRODUCTION • Due to increase in VHF coverage, there has been considerable decrease in the use of HF in AFI. However, IFALPA has been complaining of some HF congestion in AFI, notably AFI-3 (11300 KHz) and AFI-4 (8894 KHz). • A COM survey was conducted by IFALPA and IATA on VHF and HF coverage in the AFI Region to see how best the congestion could be eased.

  3. Objectives of the Survey • Establish status of implementation of mobile communications throughout the region • Monitor progress in extension of VHF radio coverage • Identify deficiencies in aeronautical mobile service coverage • Assess problems of congestion on mobile frequencies and the extent to which they are used for ground/ground coordination • Provide information to the COM/SG which will be useful in planning the improvement of air/ground communications

  4. Call sign: Position: Origin: Time: z Date: Flight Level: Aircraft type: Destination: Signed: Communications information ATS Unit: Strength Clarity Congestion Fre-quency: VHF (SEE NOTE 3) 1 – 2 – 3 – 4 - 5 1 – 2 – 3 – 4 - 5 Low – Medium - High HF 1 – 2 – 3 – 4 - 5 1 – 2 – 3 – 4 - 5 Low – Medium - High Was the frequency apparently in use for ground/ground co-ordination? Yes No Comments: The Survey Form

  5. IATA Mobile Communications Survey - 2000 • Last Survey made in 1994 • Responding to decision 4/16 of COM SG/4 • Survey conducted in cooperation between IATA & IFALPA • Dates – 20 April – 30 May 2000 • More than 1140 pilot reports received • Analysis by IATA Regional Office using Access database

  6. Main Conclusions • Higher proportion of calls are being made on VHFcompared to 1994 • HF still the only means available in significant portions of the AFI Region en route • Noticeable improvement in average quality of communications, in line with increased availability of VHF • Some reduction in congestion on AFI-4 family of frequencies but severe congestion persists on AFI-3 (11300Khz) • Congestion directly associated to lack of VHF cover and non availability of ATS/DS

  7. Use of VHF 1994 - 2000 • 1994 - 37% of reports – VHF • 2000 – 54% of reports - VHF HF VHF HF VHF VHF EXTENTIONS IN SOUTHERN AND EASTERN AFI ALSO ACCRA LUANDA,N’DJAMENA,KANO,NIAMEY,TUNIS FIRS

  8. Percentage Use of VHF by FIR - 2000

  9. Quality of Communications Strength 1994 vs 2000

  10. Quality of Communications Clarity 1994 vs 2000

  11. Quality 1994 vs 2000 • 1994 - 63% of reports 3x3 or better • 2000 – 79% or reports 3x3 or better 3x3 or better 3x3 or better

  12. Quality by FIR - 2000

  13. Deficiencies in Mobile Coverage • The survey identifies those positions where mobile communications deficiencies occur • Following slides show positions where repetitive reports indicate difficulties in air/ground communication in both HF and VHF • All reports used in these slides indicate quality of communication less than 3x3

  14. Deficiencies in Mobile coverage • Abidjan • MISLA • Luanda • Alger • ATAFA; Djanet; MOKAT; NSL; RAZEL; ROFER; • Khartoum • ALVOR; ME; Malakal;

  15. Deficiencies in Mobile coverage • Kinshasa • Buta Zega; KIBRO; MERON; SOBTO; TALAC; USDUP • N’djamena • MERON • Tripoli • Kufra; NALUT; SEB;

  16. HF Frequencies – by number of reports ALG; KAN; NIM; AFI-2 ACC; FIH; GBE; KAN; LAD; NDJ; NIM AFI-4 ADD; CAI; KRT; MGQ; NBO; TIP AFI-3 FIH AFI-4 DKR; ROB AFI-1 ACC; ABJ AFI-4 DAR; MRU; SEZ; TNR INO-1

  17. Congestion by FIR • Percentage of Reports indicating HIGH congestion - Top Five • Percentage of Reports indicating HIGH and/or MEDIUM congestion - Top Five

  18. Use of Mobile Frequencies for Coordination AFI-3 AFI-4 Frequency used for coordination INADEQUATE ATS/DS IN AFI-3 IMPLEMENTATION OF VSAT COM/SG/5 DECISION

  19. Outcome of the survey • By improving aeronautical fixed services, implementation of the NAFISAT network will reduce the use of air-ground frequencies for ATS coordination (e.g. reduction of congestion on HF frequency 11300KHz. • NAFISAT MOU has been signed by Djibouti, Egypt, Eritrea, Libya, Kenya (Somalia), Civil Aviation Caretaker Authority (CACAS) Seychelles, Sudan, Uganda, Tanzania, Yemen, ATNS and IATA hopefully Ethiopia and Saudi Arabia will join the network. • NAFISAT contract already awarded. The network is expected to be operational by 2007.

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