Liferay : How can we read form values from form when we redirect action one portlet to another portlet?

Question

Example There is two portlet : PortletA and PortletB

Now, I have one form in PortletA, When submit the form ActionURL redirect to PortletB. Now, I want to read all the form parameter in PortletB action method.

Problem

I got blank values in portletB because there is diffrent portlet-namespace. Please give me solution