Get sub page or child page name in tabs page

I am wondering how to get the sub page or child page name from Tabs page. I have searched a lot. I got `this.navCtrl.getActive() but unfortunetely this returns me the current tab name. My secnario is as follows:
From tabs page i am in Page A (Home page) and from Page A i went to Page B. My question is how i will i get the current page name(which is Page B) in Tabs.ts. Any help will be appriciated.