INTERNATIONAL TELECOMMUNICATION UNION
WRC-2000
WORLD
RADIOCOMMUNICATION
CONFERENCE
ISTANBUL, 8 MAY – 2 JUNE 2000
Document 292-E
19 May 2000
Original: English
PLENARY MEETING
In addition to the measures described in Document CMR2000/34 and its Corrigendum 1, the following may be applied in the replanning action undertaken by the Radiocommunication Bureau during WRC-2000, if necessary to resolve BSS-BSS incompatibilities in order to achieve successful replanning:
1 Those operating systems which entered in the process with a peak e.i.r.p. above
58.9 dBW and protection ratios of 31 dB (co-channel downlink at WARC-77) and 40 dB
(co-channel feeder link at Orb-88) may be requested to align themselves to have standard e.i.r.p. of
58.9 dBW or lower (down to 56 dBW) and protection ratios of 24 dB (co-channel downlink at
WRC-97) and 30 dB (co-channel feeder link at WRC-97). These operating systems may need to be analysed with respect to Recommendation ITU-R BO.1213. They may also be requested to further reduce their protection ratio of co-channel downlink down to 21 dB.
2 Existing systems * may be requested to accept, and Part B ** systems which have submitted due diligence information in accordance with Resolution 49 (WRC-97) before
12 May 2000 1700 hours, may need to accept additional EPM degradation of about 1 dB greater than that referred to in paragraph 6.2 of Attachment 1 to Document 34. These systems which have a co-channel protection ratio of 24 dB or higher may need to further reduce their co-channel protection ratio downlink to 21 dB.
3 If a significantly high number of beams remain not included in the Plan at the end of
Step 3, the implementation of both Step 3 and Step 4 will continue as follows: a) co-channel and adjacent channels downlink and feeder-link protection ratios may be reduced by about 1 dB;
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* Whenever the term “existing” is used in this document, it refers to notified assignments that are in conformity with Appendices S30 and S30A, which have been brought into use and for which the date of bringing into use has been confirmed to the Bureau.
** Whenever the term “Part B” is used in this document, it refers to satellite networks which have successfully completed the coordination procedure of Article 4 of Appendices S30/S30A, yet to be brought into use.
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CMR2000/292-E b) c)
EPM degradation threshold may be increased beyond 0.45 dB; the orbital separation arc limit beyond which interference will not be taken into account, currently 15 and 9 degrees may be reduced to 9 degrees.
4 In case of national assignments, if the preferred orbital position could not be accommodated after 3 runs, another orbital position may be allocated, in consultation with the administration.
5 There are cases in which two or more sets of channels and beams were used with different characteristics in order to meet requirements of coordination with a given country (or given countries). This situation may create difficulties with regard to accommodating national assignments of certain other (either the same or neighbouring) countries. To resolve the issue, the beam characteristics can be aligned with those which are less interfering or less sensitive.
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