Device, system and method of simultaneously communicating with a group of wireless communication units

A system comprising:

• at least one wireless communication device including:
• one or more antennas;
• and
• a wireless communication unit to assign a plurality of other wireless communication devices to at least one Space-Division Multiple Access (SDMA) group based on traffic-specification (TSPEC) information corresponding to the plurality of other wireless communication devices, and to simultaneously transmit via the antennas a plurality of different wireless communication transmissions to the plurality of other wireless communication devices of the group, wherein the wireless communication unit is to assign a wireless communication device of the plurality of wireless communication devices to an isochronous group if the TSPEC information corresponding to the wireless communication device represents a first traffic pattern, and to assign the wireless communication device to an asynchronous group if the TSPEC information corresponding to the wireless communication device represents a second traffic pattern, different from said first traffic pattern.