MIC 40 GHz fixed-relay sharing parameters: selected English translation
Source: Rakuten Mobile, 1.7GHz帯/1.8GHz帯携帯電話向け非静止衛星通信システム フィーダリンクの共用検討の進め方について（修正版）, 2 July 2021, Satellite Communications Systems Committee Working Group, meeting 27, material 27-2. English title: Approach to feeder-link sharing studies for a non-geostationary satellite communications system serving mobile phones in the 1.7/1.8 GHz bands (revised). MIC-hosted Japanese PDF.
Page 23: government fixed-relay link
Heading: 共用検討に使用する40GHz帯公共・一般 官庁固定局のTX/RXパラメータ. English: Transmit/receive parameters for 40 GHz public/general-service government fixed stations used in the sharing study.
Subheading: Radio parameters of the relay system.
| Item | Transmit/receive station 1 | Transmit/receive station 2 |
|---|---|---|
| Centre frequency | 37.525 GHz (37525 MHz) | 38.525 GHz (38525 MHz) |
| Frequency bandwidth | 42 MHz | 42 MHz |
| Antenna power | 50 mW | 50 mW |
| Unwanted-emission level | −13 dBm/MHz | −13 dBm/MHz |
| Feeder loss | 0 dB | 0 dB |
| Maximum antenna gain | 42.6 dBi | 42.6 dBi |
| Antenna pattern | ITU-R F.699; centre 37525 MHz; diameter 0.6 m | ITU-R F.699; centre 38525 MHz; diameter 0.6 m |
| Antenna height | 59.5 m | 130.4 m |
| Tilt angle | 4.55° upward | 4.55° downward |
| Permissible interference criterion | −95.5 dBm (NF = 12 dB, I/N = 10 dB) | Same |
The tilt is calculated from the stations' coordinates, a horizontal separation of 898.405 m, and antenna elevations including ground elevation of 61.7 m and 133.2 m. The accompanying pattern plot states approximately 48 dB attenuation at 90° elevation and 31 dB at 10° elevation.
The slide credits Dynamic spectrum sharing, 38 GHz stakeholder coordination meeting 3, 24 March 2021, “38 GHz sharing conditions,” p. 14.
This is one explicitly specified relay pair, separated by 1000 MHz, rather than a complete channel-centre table. The source labels 42 MHz as frequency bandwidth, not channel spacing. It does not establish a grid or prove a separate plan from the 25 MHz channel width in the 2014 report translation.