Sandbox 4 now has SDRs which are capable of acting as LTE UE or eNBs for experimentation. Two commercial basestations are attached as well. In addition, an LTE EPC is available for interoperability tests and experimentation. Finally, a number of COTS UEs are available as client devices. More details are available at the following wiki pages:
Just a heads up, we are replacing components of the noise injection system, and so it will unavailable until further notice.
Thank you, -Mike Sherman