Minimum RSSI for Data Connection over LTE

I am presently doing some range calculations for the use area of an HD2, and am wondering what is the lowest reasonable RSSI I can have while still maintain some semblance of a network connections. Does anyone have this information?

Thanks.

There really is no chart out there that shows how the network behaves at any given signal level. If you are talking about LTE you will probably have a usable signal all the way down to -100, and the lower the number the better the signal strength. When a signal gets as strong as -60 there is little to no performance increases going to -55 etc.