One reason for the relatively slow uptake of 5GHz 802.11a Wi-Fi, compared to its 2.4GHz cousin 802.11g, has been the complexity of licensing regulations affecting the 5GHz band – also an issue for WiMAX in the unlicensed spectrum. Two extensions to the 802.11 standard are easing the situation and should boost the adoption of the ‘a’ variant. One is the 802.11j specification, ratified last week, which supports the Japanese opening of the 4.9GHz band for Wi-Fi; the other is 802.11h, already finalized but mandatory in many areas from the start of 2005, which defines mechanisms to prevent WLans interfering with radar.
Via [theregister.co.uk]
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