Operators, however, would need to strike a balance between the costs of sharing (0.5 per cent increase in spectrum usage charges) and the benefits derived from spectrum sharing, it added.
In a bid to ease telecom congestion, the government on August 12, allowed companies to share airwaves in the same band so as to reduce call drops but did not allow leasing of spectrum.
"Spectrum sharing among telecom operators will benefit large players in terms of spectral efficiencies and small players in terms of advanced mobile technologies and thus is a positive for the sector and customers," Ind-Ra said.
"Disallowing spectrum leasing means that operators that were hoping to monetise their underutilised spectrum holdings cannot do so," it said.
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Operators can pool their spectrum holding for a common use, and cannot lease out additional/unutilised spectrum held by them.
"Not allowing efficient allocation of a scarce resource is a negative for the industry," it added.
Ind-Ra said sharing will be economically viable for both large and small players.
However, the sharing of liberalised/auction allocated spectrum with administratively allocated spectrum is a roadblock.
An operator needs to pay one-time spectrum charges to liberalise his administratively allocated spectrum block, it added. Ind-Ra expects most action in the 800MHz and 1,800MHz bands as they have the capability to provide 4G services over 5MHz contiguous blocks.
Broadband base in India is growing and there is increasing demand for spectrum to support growing data volumes over wireless mobile network.
"This is unique to India (with global average being below 50 per cent) and therefore demands higher spectrum," Ind-Ra said.