On multiple access channels with delayed CSI at transmitters

We consider a two-user state-dependent multiaccess channel in which the states of the channel are known only strictly causally at both encoders, but not at the decoder. Both encoders transmit a common message and, one of the encoders also transmits an individual message. We study the capacity region of this communication model. We establish inner and outer bounds on the capacity region. The outer bound is non-trivial, and has a relatively simple form. Furthermore, we show that the inner and outer bounds coincide in some special case; and, so, we characterize the capacity region fully in these cases. The results shed more light on the utility of delayed channel state information for increasing the capacity region of multiaccess channels; and tie with some recent progress in this framework.