Abstract: A method for adapting communications system topology includes receiving, by an adaptation device, first signal plus interference to noise ratio (SINR) values from user equipments in a communications system, the first SINR values associated with a transmission configuration as configured by the communications system, and adapting, by the adaptation device, a topology of the communications system in accordance with the first SINR values received from the user equipments already attached to the communications system.

Abstract: A method and apparatus for bi-direction training in D2D/cellular networks. An embodiment method includes sending training symbols to sense interference from the cellular UEs, calculating an interference subspace from the cellular UE to each of the D2D UEs, calculating an orthogonal projection matrix based on the interference subspace calculated, and iteratively updating receive filters through forward training and transmit beamformers through backward training after the orthogonal projection matrix is calculated to align the D2D UEs. In an embodiment, training symbols are sent to sense interference from the cellular UE.