Patent ID: 9048895
Filing Date: 2015-06-02
Classification: H04B,H04L

Abstract:
1. A method for execution by a wireless communication device, the method comprising: transmitting a multi-user null data packet (MU-NDP) announcement frame to a plurality of wireless communication devices, wherein the MU-NDP announcement frame indicating which of the plurality of wireless communication devices being sounded, wherein the MU-NDP announcement frame includes a group definition field for use to interpret group identification fields (group IDs); after transmitting the MU-NDP announcement frame, transmitting a plurality of NDP sounding frames to those of the plurality of wireless communication devices being sounded as indicated within the MU-NDP announcement frame, wherein each NDP sounding frame of the plurality of NDP sounding frames includes a respective group ID that, when interpreted based on the group definition field, indicates which of the plurality of wireless communication devices is sounded by that NDP sounding frame and that is different from group IDs included within each of the other NDP sounding frames of the plurality of NDP sounding frames; and after transmitting the plurality of NDP sounding frames, receiving a plurality of sounding feedback signals from the plurality of wireless communication devices being sounded as indicated within the MU-NDP announcement frame or from a subset thereof.