The model is built upon the assumption that the probabil- ity distribution of available destinations among the buered frames at the Base Station (BS) is approximately the same as the probability distribution of the trac arriving to the BS, th

If SDMA is used on the downlink of a multi-user MIMO system, either long-term or short-term channel state information has to be available at the base station (BS) to faciliate the joint precoding of the signals intended for the different users.