MPLS Backhaul for LTE ?

I never read much about MPLS except for attending few classes on it in my university to get my Masters degree. But for past couple of days I am trying to understand MPLS and how can it be used as back haul in LTE. The traditional T1 lines currently used will have to fade away as the air interface bandwidth has increased from 10 Kbps to 100 Mbps, that is by 10000 folds and laying more T1/E1 lines to support such speeds in the back haul would increase the cost tremondously. So moving to ethernet is a possible solution. I first read an article whose link was published in LTE group in LinkedIn. I was pretty much fascinated by the article and it made some sense to me. Iam still trying to draw conclusions but first "how does MPLS work" is what I should be doing this weekend.
The following links would give more insights on MPLS back haul for 4G networks.
LTE and Black Sawn
Mobile Back haul for Mobile Wimax and LTE by Sprint Nextel
MPLS in Mobile Back haul Networks : Frame work and requirements