WiMax or Worldwide Interoperability for Microwave Access is a fourth generation technology which allows 37 Mbps broadband speed without the need for cables and this has been launched in Kochi by BSNL. Yup BSNL haad already 3G services running and now its going 4G. The technology is provided by AVIAT, formerly Harris Stratex.
Though there is no specific tariff rates declared for Kochi but BSNL has already a tariff plan for WiMax in place which includes Limited / Unlimited Home plan and business plan and if you compare with current broadband plan its more or less same but with same speed. Check out the WiMax Tariff