TNAG-2857-FCO40-4110-Satellite-Licensing-and-Asia-Satellite-Telecommunications-Co-1993 — Page 44

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Summary Record of Coordination Meeting between Telecommunications Administrations of the People's Republic of China and the United Kingdom of Great Britain and Northern Ireland Regarding Satellite Networks

Beijing 25-26 June, 1993

The representatives of the Telecommunications Administrations of the People's Republic of China (China) and the United Kingdom of Great Britain and Northern Ireland (UK) met at the request of the UK in Beijing on 25-26 June 1993 for the purpose of coordinating the AsiaSat satellite networks with the Chinese satellite networks.

The list of delegates is given in Annex 1.

The Agenda is attached as Annex 2.

1.

Both sides confirmed the satellite networks which had been completed coordination previously and the C/I criteria which had been agreed. Reference should be made to summary records for previous six meetings.

2.

The UK informed China that AsiaSat-E at 100.5°E would be launched in late 1994, Due to time constraint of this meeting, both sides mutually agreed to focus the discussion on the mutual interference problem between the C-band transponders of DFH-3-OB at 103°E and of AsiaSat-E at 100.5°E. The mutual interference between the Ku-band transponders of Chinasat-11 at 101.5°E and of AsiaSat-E would be discussed at a later date.

3.

Both sides exchanged the interference calculation results of DFH-3-OB and AsiaSat-E. The calculations that China provided were the same as shown in the summary records of the sixth meeting. The calculations provided by the UK are attached in Annex 3.

4. The interference calculation results showed that the agreed C/I criteria were not met in most co-frequency transponders of both sides.

5.

Both sides unanimously agreed that under the condition of not changing orbital position and coverage area of the respective networks, DFH-3-OB and AsiaSat-E networks would be compatible by taking the following technical measures:

i)

By modifying the polarization of one side's network, the co-frequency transponders of both sides would have opposite polarization. Under the condition of 2.5 degree separation between the satellites, it would improve the C/I value by 4-5 dB. The UK said that improvement should be 4-10 dB and would supply more information to China for study. Accordingly, part of the interference problems would be solved.

Before either side put the transponders into service, it should provide detailed and accurate transponder traffic plans to the other side. If the agreed C/I interference limits were not met, re-arrangement of the traffic in the transponders would be required.

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