The Rajya Sabha (meaning the "Council of States") is the upper house of the Parliament of India. West Bengal elects 16 seats and they are indirectly elected by the state legislators of West Bengal. The number of seats, allocated to the party, are determined by the amount of seats, a party possesses during nomination and the party nominates a member to be voted on. Elections in within the state legislatures are held using Single transferable vote with proportional representation.
Taking effect from April 2.Source: NDTV 24x7.
Source:Parliament of India (Rajya Sabha)