WiMAX has developed system profiles covering the popular licence-exempted bands in 2.4 GHz and 5 GHz and other licensed bands in 2.3 GHz, 2.5 GHz and 3.5 GHz. At the moment, WiMAX will focus its conformance and interoperability test procedures on equipment that operates in 2.5 GHz and 3.5 GHz licensed bands and 5.8 GHz unlicensed band using 256 FFT OFDM modulation scheme. The flexible channel plan from 1.5 MHz to 20 MHz per channel will be adopted by WiMAX.
In China, Hong Kong is playing a pioneer role in WiMAX market. At present, radio equipment comply with the Exemption Order can be used in Hong Kong without a licence. WiMAX equipment can readily be operated in the license exempted 2.4 GHz and 5GHz bands provided that they meet the technical conditions given in the Exemption Order.
Some countries have already deployed wireless broadband services. In the U.S., the frequencies are in the 2.5- 2.7 GHz bands. Europe, Latin America and Asia including the Mainland have frequency allocations in the 3.5 GHz band. The actual frequency allocations are slightly different from each country, but most of them fall within the 3.4 – 3.6 GHz band.
There were discussions in the Radio Spectrum Advisory Committee (RSAC) in March 2004 on the frequency allocations for WiMAX systems in Hong Kong. In Mainland, the 3.4 –3.43 GHz / 3.5 –3.53 GHz band is opened for the implementation of BWA services. As the Mainland is a large market for BWA, Hong Kong will benefit if the spectrum allocation for BWA is harmonized with that adopted in the Mainland. OFTA is now considering the feasibility of opening more frequency bands to facilitate the future implementation of WiMAX application in Hong Kong.
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