How can you say that “Upper House is permanent in Bi-cameral Legislature”?

In Bi-cameral legislature, the two Houses exist, one is known as the Upper House and
the other is Lower House. The Upper House is permanent:
 The members to the senate of Canada are nominated for whole life.
 The House of Lords in Britain is hereditary which never ceases to exist.
 The one-third members of the Rajya Sabha in India get retired after every two years
and new members are elected there. Hence, they enjoy the tenure of six years as
well as it never dissolves.