METHOD AND APPARATUS FOR MEDIUM ACCESS CONTROL IN A WIRELESS BROADBAND SYSTEM WITH MULTIPLE-INPUT MULTIPLE-OUTPUT OR MULTIPLE-INPUT SINGLE-OUTPUT TECHNOLOGY WITH MULTIUSER CAPABILITIES

摘要

Method and apparatus for medium access control in a wireless broadband system with multiuser MIMO/MISO technology comprising the steps of a transmitter (Tx) broadcasting a polling message (1) to all the users (Rx1... Rxi... RXN) associated to said transmitter (Tx); the users answering with reply messages (2) during a time slot (61...6m) randomly selected from a plurality of time slots in which a period of time dedicated to sending reply messages (5) is divided; the transmitter (Tx) performing a scheduling and transmission of data (3); and scheduled users sending Acknowledgment messages (4). Preferably, only users which measure a Signal to Noise plus Interference Ratio over a pre-defined threshold for a transmission beam send reply messages (2).