The regulator had proposed a reserve price of Rs 2,685 crore per megahertz for 800 Mhz, used for CDMA services, in its February recommendations.
Trai had proposed a reserve price of around Rs 1,800 crore for 800 Mhz for the auction in March 2013 wherein Sistema Shyam Teleservices (SSTL) was only bidder and it won radiowaves to operate in 8 circles for Rs 3,639 crore.
The new reserve price of Rs 3,104 crore is 72 per cent higher than the Rs 1,800 crore rate in 2013 auction.
The DoT had sent back Trai's recommendations on 800 MHz band for reconsidering some points.
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The Department had also sent back Trai's proposals on 900 Mhz and 1800 Mhz bands, on which the Authority had reiterated its earlier stand on all proposals.
Trai said regarding DoT's request for reviewing price, it is of the view "that since the reserve prices have been referred for reconsideration, it is obliged to take into account developments subsequent to its earlier Recommendations of February 2014 for the 800 MHz band.
The Authority applies five approaches to calculate the valuation of 800 MHz which include 1.5 times or 2 times of value of 1800 Mhz band, producer surplus model, model based on revenue from data services and February auction determined price of 900 MHz (for three metro circles).
It then fixes the reserve price at 80 per cent of the average valuation arrived through the five approaches.
Apart from the reserve price, Trai has reiterated its other recommendations like putting the entire available spectrum with the DoT in 800 Mhz to auction.
The regulator also stood by its recommendation that entire CDMA spectrum held by MTNL be put up for auction as it is underutilised and government should take back CDMA spectrum held by BSNL for auction except one block of frequency in Jammu and Kashmir, Assam and North-East service areas.