If there is a deadlock over any bill between Lok Sabha and Rajya Sabha, the procedure prescribed for resolving the deadlock is the
President may call a joint sitting of the two houses in which the matter is decided
A joint session or joint convention is, most broadly, when two normally separate decision-making groups meet together, often in a special session or other extraordinary meeting, for a specific purpose.
Most often it refers to when both houses of a bicameral legislature sit together. A joint session typically occurs to receive foreign or domestic diplomats or leaders, or to allow both houses to consider bills together.
If a bill has been rejected by any house of the parliament and if more than six months have elapsed, the President may summon a joint session for purpose of passing the bill. The bill is passed by a simple majority of a joint sitting.