Transmitter cooperation in interference channel with delayed CSIT

摘要

In this work we study the impact of limited transmitter cooperation on interference management in two-user interference channel. In particular, we consider the two-user interference channel with delayed channel state information at the transmitters (delayed CSIT). We first present a model to capture and quantify the amount of cooperation between the transmitters. In this model we denote the fraction of shared messages that are intended for Rx, Rx by ρ,ρ, respectively, and then, characterize the degrees of freedom (DoF) region as a function of ρ, ρ. As a result, the two-user interference channel and two-user multiple-input single-output (MISO) broadcast channel become special cases of no cooperation (ρ = ρ = 0) and full cooperation (ρ = ρ = 1) in our framework. Moreover, our result indicates that the maximum benefit of cooperation from the DoF perspective is achieved by sharing only half of the messages between the transmitters.