What is page segmentation
 

Paging is used to get a large linear address space without having to buy more physical memory. Segmentation allows programs and data to be broken up into logically independent address spaces and to aid sharing and protection.

I'm not sure of what exactly you mean by page segmentation, but I'd guess that's memory segmentation (i.e. memory being addressed via a segment identifier + an offset within that segment, instead of just a flat address) implemented on top of paging.