Patent ID: 8792577
Filing Date: 2014-07-29
Classification: H04L

Abstract:
1. A method for Medium Access Control in a wireless broadband system with Multiple-Input Multiple-Output or Multiple-Input Single-Output technology with multiuser capabilities, the method comprising: (i) creating, by means of a plurality of antennas comprised by a transmitter, a plurality of transmission beams which are multiplexed in space; (ii) broadcasting from the transmitter to a plurality of users through every transmission beam a polling message which requests a state information of, at least, one transmission beam, said polling message includes a length of a period of time dedicated to sending reply messages; (iii) measuring a signal to noise plus interference ratio for each transmission beam at each user; (iv) sending a reply message from at least one user which receives the polling message, wherein the reply message comprises, at least, a first field which indicates the highest signal to noise plus interference ratio measured by the user among the transmission beams and a second field which indicates an identifier of the transmission beam for which the highest signal to noise plus interference ratio is measured at the user; and wherein the reply message is sent during a time slot randomly selected from a plurality of time slots in which a period of time dedicated to sending reply messages is divided; (v) at the transmitter, assigning a user and a transmission bit rate to each transmission beam according to the signal to noise plus interference ratio measured by the assigned user for said transmission beam; (vi) simultaneously sending data from a transmission queue to each assigned user at the assigned transmission bit rate over the plurality of transmission beams; and (vii) sending an Acknowledgement message to the transmitter from each user which successfully receives data from the transmission queue sent by the transmitter.