Spectrum sharing can take a number of forms. In India, it primarily is an immediate issue with respect to mobile operators pooling spectrum in the 2G and 3G bands.
The Telecom Regulatory Authority of India (TRAI) recommends allowing mobile operators to share spectrum, including capacity at 2100 MHz, for the purpose of improving spectral efficiency.
Sharing is allowed in 800 MHz, 900 MHz, 1,800 MHz, 2,300 MHz and 2,500 MHz bands, so long as all the carriers wishing to share have licenses in the shared bands.
