# US 10,455,469 B2 · Radar channel switching for Wi-Fi virtual reality

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- Number: US 10,455,469 B2
- Document ID: US10455469B2
- Status: Granted
- Kind: B2
- Application number: 15/857,046
- Filed: 2017-12-28
- Published: 2019-01-31
- Granted: 2019-10-22
- Earliest claimed: 2017-12-28
- Assignees: Intel Corporation
- Applicants: Intel Corporation
- Inventors: Rajneesh Chowdhury; Noam Ginsburg; Ofer Hareuveni; Karthik Veeramani
- Web page: https://patentgrep.com/patent/US10455469B2

## CPC

- H04W 36/0005: {Control or signalling for completing the hand-off}
- H04L 65/611: for multicast or broadcast (systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06)
- H04L 65/764: {at the destination (reformatting of additional data in video clients H04N21/4355)}
- H04L 67/131: Protocols for games, networked simulations or virtual reality
- H04W 36/142: {over the same radio air interface technology}
- H04L 65/61: for supporting one-way streaming services, e.g. Internet radio
- H04W 36/06: Reselecting a communication resource in the serving access point
- H04W 36/20: for optimising the interference level
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Systems and methods may use radar channels for virtual reality streaming or output. A method may include sending virtual reality content to a head-mounted device over a radar channel, detecting a signal on the radar channel, propagating channel switch feedback to a virtual reality subsystem using an interface between the virtual reality subsystem and a wireless component. The method may include modifying the virtual reality content based on the channel switch feedback, such as by using the virtual reality subsystem.

## Claims

### Claim 1

A device for using radar channels for virtual reality output comprising:
a virtual reality (VR) subsystem to generate VR content;
a wireless component to broadcast the VR content to a head-mounted device over a radar channel;
a radar detector to detect a signal on the radar channel;
an interface between the VR subsystem and the wireless component to, in response to the radar detector detecting the signal on the radar channel, propagate channel switch feedback to the VR subsystem; and
wherein the VR subsystem is to modify the VR content based on the channel switch feedback.

### Claim 2 (depends on 1)

The device of claim 1, wherein the wireless component is to switch to a second channel in response to the radar detector detecting the signal on the radar channel.

### Claim 3 (depends on 2)

The device of claim 2, wherein the second channel is a non-radar 5 GHz channel or a 2.4 GHz channel.

### Claim 4 (depends on 2)

The device of claim 2, wherein the second channel is a second radar channel, and wherein the device further comprises a second radar detector to determine that the second radar channel is clear before the wireless component switches to the second radar channel.

### Claim 5 (depends on 4)

The device of claim 4, wherein to determine that the second radar channel is clear, the second radar detector is to monitor the second radar channel for at least sixty seconds before the wireless component switches to the second radar channel.

### Claim 6 (depends on 2)

The device of claim 2, wherein to switch to the second channel, the wireless component is to use a priority queue based on information received from the VR subsystem via the interface.

### Claim 7 (depends on 1)

The device of claim 1, wherein to propagate the channel switch feedback to the VR subsystem, the interface is to notify the VR subsystem of an upcoming channel switch in advance of the wireless component switching from the radar channel.

### Claim 8 (depends on 1)

The device of claim 1, wherein the VR subsystem is further to render the VR content at a lower frame rate or not render frames during a duration of a channel switch time.

### Claim 9 (depends on 1)

The device of claim 1, wherein the VR subsystem is further to enable frame synthesis for a duration of a channel switch time by sending a message to the head-mounted device via a special wireless queue that the wireless component is to dispatch before switching from the radar channel.

### Claim 10 (depends on 1)

The device of claim 1, wherein the VR subsystem is to identify that queued content is a last portion of a frame, and in response, send the last portion of the frame to a special wireless queue that the wireless component is to dispatch before switching from the radar channel.

### Claim 11 (depends on 1)

The device of claim 1, wherein the VR subsystem is to identify that queued content is a new frame, and in response, discard the queued content instead of sending it to the wireless component.

### Claim 12 (depends on 1)

The device of claim 1, wherein, in response to the wireless component switching to a congested channel from the radar channel, the VR subsystem is to perform a quality of service change.

### Claim 13 (depends on 12)

The device of claim 12, wherein the quality of service change includes an instruction to adjust a graphics processing unit of the device to render frames at a lower resolution or pixel density.

### Claim 14 (depends on 12)

The device of claim 12, wherein the VR subsystem is to determine that the VR content is non-interactive content, and wherein the quality of service change includes an instruction to use a graphics processing unit of the device to decode and render additional frames for a duration of time the wireless component is connected to the congested channel.

### Claim 15 (depends on 1)

The device of claim 1, wherein the wireless component operates in accordance with an IEEE 802.11 family of standards.

### Claim 16

A method for using radar channels for virtual reality output comprising:
generating virtual reality (VR) content using a VR subsystem of a device:
broadcasting, from a wireless component of the device, the VR content to a head-mounted device over a radar channel;
detecting a signal on the radar channel using a radar detector of the device;
propagating, in response to the radar detector detecting the signal on the radar channel, channel switch feedback to the VR subsystem using an interface between the VR subsystem and the wireless component; and
modifying the VR content based on the channel switch feedback, using the VR subsystem.

### Claim 17 (depends on 16)

The method of claim 16, further comprising switching to a second channel, using the wireless component, in response to the radar detector detecting the signal on the radar channel.

### Claim 18 (depends on 17)

The method of claim 17, wherein the second channel is a second radar channel, and further comprising determining, using a second radar detector, that the second radar channel is clear before the wireless component switches to the second radar channel.

### Claim 19 (depends on 18)

The method of claim 18, wherein determining that the second radar channel is clear includes monitoring the second radar channel for at least sixty seconds before switching to the second radar channel.

### Claim 20 (depends on 17)

The method of claim 17, wherein switching to the second channel includes using a priority queue based on information received from the VR subsystem via the interface.

### Claim 21 (depends on 16)

The method of claim 16, wherein propagating the channel switch feedback to the VR subsystem includes notifying the VR subsystem of an upcoming channel switch in advance of switching from the radar channel.

### Claim 22 (depends on 16)

The method of claim 16, further comprising rendering the VR content at a lower frame rate or not render frames during a duration of a channel switch time.

### Claim 23

At least one non-transitory machine-readable medium including instructions for using radar channels for virtual reality output, which when executed by a processor, cause the processor to:
generate virtual reality (VR) content using a VR subsystem of a device:
broadcast, from a wireless component of the device, the VR content to a head-mounted device over a radar channel;
detect a signal on the radar channel using a radar detector of the device;
propagate, in response to the radar detector detecting the signal on the radar channel, channel switch feedback to the VR subsystem using an interface between the VR subsystem and the wireless component; and
modify the VR content based on the channel switch feedback, using the VR subsystem.

### Claim 24 (depends on 23)

The at least one non-transitory machine-readable medium of claim 23, wherein to propagate the channel switch feedback to the VR subsystem, the instructions further cause the processor to notify the VR subsystem of an upcoming channel switch in advance of switching from the radar channel.

### Claim 25 (depends on 23)

The at least one non-transitory machine-readable medium of claim 23, wherein the instructions further cause the processor to render the VR content at a lower frame rate or not render frames during a duration of a channel switch time.