Solver LTE is a high-performance test tool for load and functional tests of the EPC (Evolved Packet Core) in LTE networks, using the S1 interface to connect to the SUT, (System Under Test).

S1 is a standardised logical interface between the eNodeB and the Evolved Packet Core (EPC). S1 has two “flavours”, S1-MME for exchange of signalling messages between the eNodeB and the MME; (control plane), and S1-U for the transport of user datagrams between the eNodeB and the Serving Gateway (S-GW); (user plane).

The Solver LTE solution simulates traffic over the S1 interface.