US 11,943,016 B2
Physical layer shielding of wireless communications
John Matthew Swartz, Lithia, FL (US); Nagendra Kumar Nainar, Morrisville, NC (US); and Matthew Aaron Silverman, Shaker Heights, OH (US)
Assigned to CISCO TECHNOLOGY, INC., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Nov. 17, 2022, as Appl. No. 17/989,262.
Application 17/989,262 is a continuation of application No. 17/582,689, filed on Jan. 24, 2022, granted, now 11,575,413.
Prior Publication US 2023/0239012 A1, Jul. 27, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 7/0452 (2017.01); H04B 7/0426 (2017.01); H04B 17/327 (2015.01); H04B 17/336 (2015.01)
CPC H04B 7/0452 (2013.01) [H04B 7/0426 (2013.01); H04B 17/327 (2015.01); H04B 17/336 (2015.01)] 20 Claims
OG exemplary drawing
 
1. A system comprising:
a serving wireless access point configured for wireless communication with one or more wireless client devices within a physical space; and
a plurality of shield wireless transceiver devices configured to be positioned around a perimeter of, or in an arrangement within, the physical space, wherein each of the shield wireless transceiver devices includes one or more directional antennas pointing outward from the physical space so that transmissions from respective shield wireless transceiver devices are strongest in a predetermined area within the physical space or outside of the physical space where shielding is to be achieved for transmissions between the serving wireless access point and the one or more wireless client devices;
wherein the serving wireless access point is configured, for a downlink transmission to a first wireless client device of the one or more wireless client devices, to:
send a multi-user multiple-input multiple-output (MU-MIMO) transmission that includes a stream containing downlink traffic intended for the first wireless client device; and
cause one or more first shield wireless transceiver devices of the plurality of shield wireless transceiver devices to send a downlink cover transmission while the downlink traffic is being transmitted to the first wireless client device that creates interference with reception of the downlink traffic outside of the physical space of the downlink traffic transmitted to the first wireless client device.