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18GHz Band Update

18GHz Band Update. Chris Cheeseman. Date: 10 th Sept 2001 Document Reference: prFLCC 0201 006 0 Meeting: FLCC Working Paper No: FLCC (02-01) / 006. 18 GHz Access Radio Deployment. 15,000 radio tranceivers,. Typical 8Mbit/s business link Cellular network infrastructure.

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18GHz Band Update

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  1. 18GHz Band Update Chris Cheeseman Date: 10th Sept 2001 Document Reference: prFLCC 0201 006 0 Meeting: FLCC Working Paper No: FLCC (02-01) / 006

  2. 18 GHz Access Radio Deployment • 15,000 radio tranceivers, • Typical 8Mbit/s business link • Cellular network infrastructure

  3. 18GHz Fixed and Satellite spectrum MOBILE (not used) FSS (Space to Earth) - [Astralink, Spaceway etc] MSS Feeder Links NGSO FSS (Teledesic) EESS BSS Feeder Links FIXED SERVICE Existing BT low-capacity systems (10/20MHz spaced) New BT low-capacity systems (7 MHz Spaced as 38GHz) High / medium capacity BT systems (inc. SDH 55/27.5MHz sp 1' 2' 3' 4' 5' 6' 7' 8' 1 2 3 4 5 6 7 8 17.7 17.8 17.9 18.0 18.1 18.2 18.3 18.4 18.5 18.6 18.7 18.8 18.9 19.0 19.1 19.2 19.3 19.4 19.5 19.6 19.7 (GHz) FREQUENCY

  4. Current status • Band due to return to RA management in 2003: • Complex band so many logistical issues • Difficult sharing issues with satellite • Particularly NGSO (teledesic) • Channel plans: • ITU-R F.595 and CEPT ERC Rec. compliant • 7MHz, 1008 duplex for low capacity • 110/55/27.5MHz, 1010MHz duplex med/high cap. • Many antenna/equipment combinations - need time to sort out tools ! • Some legacy (low capacity) systems in centre of band • Standards • BT and ETSI specs (e.g. new ETSI EN 301 787)

  5. 18GHz Satellite Feeder links • 17.7-18.4 GHz allocated to FSS (E-S) for feeder links for BSS • Sharing Constraints for FSS due to fixed links in 17.7 - 19.7GHz band, especially in urban areas. • Trend is for growth in number of FSS Earth stations. • Desirable to safeguard the FS spectrum from FSS uplinks - especially in urban areas. • Existing UK FSS policies on the band could be publicised ?

  6. Satellite sharing issues • 8,000 fixed links in UK and growing fast • New FSS systems planned yr. 2005? (e.g. Teledesic, ARCS, Spaceway) • Risk of interference to Earth station from existing fixed links at 18GHz (low risk) • Satellite PFD limits tightened across most of the band at WRC-97 • Mitigation techniques needed (ATPC, antennas, site shielding) as appropriate. i Isat IBT Probability ?

  7. New ERC Decisions on FS/FSS New “ERC Decisions” developed for 11GHz, 18GHz and 28 GHz bands • Intensive discussions in CEPT over 3 years • 11 GHz : gives priority to FSS (FS limited to long-haul high capacity) • 18 GHz : emphasizes that uncoordinated Earth stations take the risk of interference from FS and recommends interference mitigation techniques • 28 GHz : segments the band 1/3 FSS, 1/3 FS and 1/3 shared (geographic basis)

  8. WRC2003 Agenda item 1.25 • WRC-2003 will consider regulatory issues and identification of spectrum for high density fixed-satellite systems above 17.3GHz, in particular above 19.7 GHz • Teledesic want to get 18.8-19.3 / 28.6-29.1 GHz identified for HDFSS exclusively. • UK working hard within ITU in order to make sure that the thrust of the ERC Decisions get carried through to ITU-R Recommendations • BT encourages identification of current exclusive FSS bands and support opening up new bands such as 39.5-40GHz ?

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