  Licensed but unutilized television (TV) band spectrum is called as TV white
space in the literature. Ultra high frequency (UHF) TV band spectrum has very
good wireless radio propagation characteristics. The amount of TV white space
in the UHF TV band in India is of interest. Comprehensive quantitative
assessment and estimates for the TV white space in the 470-590MHz band for four
zones of India (all except north) are presented in this work. This is the first
effort in India to estimate TV white spaces in a comprehensive manner. The
average available TV white space per unit area in these four zones is
calculated using two methods: (i) the primary (licensed) user and secondary
(unlicensed) user point of view; and, (ii) the regulations of Federal
Communications Commission in the United States. By both methods, the average
available TV white space in the UHF TV band is shown to be more than 100MHz! A
TV transmitter frequency-reassignment algorithm is also described. Based on
spatial-reuse ideas, a TV channel allocation scheme is presented which results
in insignicant interference to the TV receivers while using the least number of
TV channels for transmission across the four zones. Based on this reassignment,
it is found that four TV band channels (or 32MHz) are sufficient to provide the
existing UHF TV band coverage in India.
