Multiuser Orthogonal Opportunistic Schemes: A Stability Target

Scheduling in a Broadcast multiantenna channel based on partial Channel State Information at the Transmitter (CSIT) is carried out in an opportunistic way, where several beams are randomly generated at the Base Station (BS) transmitter to simultaneously deliver some users with their intended data. System stability is considered along the paper to guarantee a non-explosive behaviour of users´ queues at the BS. To account for a better stability achievement while keeping an acceptable system sum rate, several random beam sets are generated to serve the users in a heterogeneous system, where both voice and data applications are considered. The analytical study is followed by extensive simulations for an outdoor wireless scenario where it is shown the superior performance of the proposed additional processing.