A scheduler for scheduling downlink transmissions of orthogonal frequency division multiple access (OFDMA) signals using spatially directed beams to a plurality of subscriber stations in a wireless network. The scheduler schedules the downlink transmissions as a function of frequency, time, and space....http://www.google.de/patents/US8098632?utm_source=gb-gplus-sharePatent US8098632 - Apparatus and method for downlink scheduling in a SDMA-enabled OFDMA wireless network
