RADIO INTERFFERENCE IN BORDER AREAS Group 5 RADIO INTERFFERENCE IN BORDER AREAS

Overview What types of interferences do you country often encounter? When encountering malicious interference, how should we normally process with the help of ITU regulation? How do your country usually do to reduce the possibility of interference? Does your country have any bilateral or multilateral frequency cooperation agreement? If yes, give some details about it?

Introduction Interference: Any signal received from Transmitter different than the intended one Interference occur as the radio signal could not stop at the border line. Divide into two kinds: malicious interference, and unintentional

Interference faces different country China: mainly domestic interferences. Some agreements signed with neighbor countries, like Russia, Vietnam, etc. Bangladesh: is surrounded by India in 3 sides and Bay of Bengal in another side. And interference from India. No bilateral agreement made. Processing going on. Two country level meeting occured. Indonesia: have bilateral forum with Malysia, especially for FM Radio Broadcasting we have special task fora. Potentially harmful interference on FM Radio broadcast from neighbor country (strong spill over from neighbor country to Indonesia) . Lao: Interference case between Lao and Thailand. View: 1. Mobile service in band 850MHz to 900MHz (Lao-Thailand). 2. interference of the Aeronautical from Sound Broadcasting.

Interference case

Bilateral Agreement The topic was proposed by China side in 2012. The agreement was signed this year in Russia. land mobile service 150-156MHz band Reason: quite hard to come to an agreement on the use of these frequencies in border areas.

Frequency Coordination Proposal of 150/400MHz Suggestion from the China side: The coordination should be conducted based on the principle of sharing frequency resouces on the parity basis and striving for mutual respect and benefit. Both Sides should allocate preferential and non-preferential frequencies taking into consideration of but not limited to the frequency assignments in Master International Frequency Register. It is recommended to try to allocate continous channels for each Side.

Restrictions Preferential Channels（trigger） Non-Preferential Channels(limit) Shared Channels(limit) Frequcy (MHz) 150 400 Field strength dB(µV/m) at the height of 10m(10%time,50%location) 12 20 At the Distance From the Border(km) 80 50 Maximum interference distance (km)

Components Definitions General Technical provisions Content of the agreement Appendix Language is English

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