WRC 2000 and 40.5-43.5GHz

Date: 12th June 2000

Title: WRC and 40GHz

Source: RA

Objectives: To update on the outcome of WRC for the 40GHz band.

Contact: Barry Lewis
Tel: 0207 211 0313
Fax: 0207 211 0115

WRC 2000 and 40.5-43.5GHz

Introduction The negotiations regarding use of the 40Hz band were included under the topic of High Density Fixed Services (HDFS) and the following is extracted from the CEPT/CPG Press Release on WRC 2000:

"High Density Fixed Service (HDFS)

With regard to the already identified bands for HDFS (31.8-33.4 GHz, 51.4-52.6 GHz, 55.78-59 GHz and 64-66 GHz) the CEPT positions were maintained. For the sake of compromise CEPT accepted an allocation to the FSS (also retaining BSS) in Region 1 in the band 40.5 - 42.5 GHz, which was requested by many administrations even within CEPT. In exchange to this allocation to the satellite services it was possible to maintain all other CEPT positions for the range 37 - 43.5 GHz, namely the identification to HDFS, pfd limits for the FSS and BSS as well as adequate protection for the radioastronomy service. Consequently, a total of 10 GHz of spectrum have been identified for HDFS above 30 GHz. This will allow for the long term development of fixed wireless access, wireless local loop, etc."

Article S5
The frequency allocation tables in Article S5 of the Radio Regulations now have a footnote S5.547 that has the following text:

"S5.547

The bands 31.8-33.4 GHz, 37-40 GHz, 40.5-43.5 GHz, 51.4-52.6 GHz, 55.78-59 GHz and 64-66 GHz are available for high-density applications in the fixed service (see Resolutions [COM5/11] (WRC-2000)(BL: Not applicable to the 40GHz band) and [COM5/27] (WRC-2000)). Administrations should take this into account when considering regulatory provisions in relation to these bands. Because of the potential deployment of high-density applications in the fixed-satellite service in the bands 39.5-40 GHz and 40.5-42 GHz, administrations should further take into account potential constraints to high-density applications in the fixed service, as appropriate (see Resolution [COM5/28] (WRC-2000))."

The updated table is shown below:

40.5-55.78 GHz

Fixed Satellite Service

Examination of the Article S5 table shows that in the range 40.5-42.5GHz the Fixed Satellite Service has access to the band in all three regions. In order to facilitate this, studies in the last study period developed power flux density limits for space-borne transmitters in order to protect the fixed Service from interference. These were developed in ITU-R SG4-9S and CPM supported in Europe by work within CEPT SE19. As a result agreed limits were available and these have been incorporated into Article S21 of the Radio Regulations. Examination of the table shows different limits for emissions from geostationary satellites and non-geostationary satellites and for different parts of the band. Extract from Article S21 modifications:

Table S21-4 (end)

Further Work

Further studies have been proposed by the following resolutions mentioned above in the text for footnote S5.547:

Resolution [COM5/28] (WRC-2000):

Power flux-density limits in the bands 37.5-42.5GHs for the fixed-satellite service, broadcasting-satellite service and mobile-satellite service.

Despite resolving to apply the limits in the table above, invites studies on whether the pfd values adequately protect FS in the bands 37.5-40GHz, 40.5-42GHz and 42-42.5GHz from space-borne transmitters.

To study pfd values for the BSS in the range 40.5-42.5GHz.

To address the criteria and techniques for addressing interference into FSS receivers from FS transmitters intended to operate in the same area.

To study the nominal clear-sky pfd’s and time percentages that they might be exceeded to cater for fading conditions between satellites and earth stations.

Resolution [COM5/27] (WRC-2000):

Development of the technical basis for co-ordination of radio astronomy stations with transmitting high-density fixed systems in the fixed service, in the band 42.5-43.5GHz.

Resolves to conduct studies on the co-ordination distance between radio astronomy stations operating in this band and HDFS stations with a view to developing ITU-R Recommendations.

Top