Streaming display data from a mobile device using backscatter communications

Patent metadata

Field	Value
Publication number	US-9602191-B2
Application number	US-201414317735-A
Country	US
Kind code	B2
Filing date	Jun 27, 2014
Priority date	Jun 27, 2014
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

A method of wirelessly communicating a screen image between a mobile device and a base station coupled to a display terminal includes establishing a wireless display session between the mobile device and the base station. Electromagnetic (“EM”) radiation emitted from the base station is incident upon an antenna of the mobile device. The screen image is transmitted to the base station for display on the display terminal by modulating a radar cross-section of the mobile device between two or more states to encode the screen image on a backscatter channel of the EM radiation.

First claim

What is claimed is:

1. A method of wirelessly streaming display data, the method comprising:
establishing a wireless display session between a mobile device and a base station coupled to a display terminal;
receiving, at the mobile device, electromagnetic (“EM”) radiation emitted from the base station and incident upon an antenna of the mobile device; and
encoding a screen image generated by the mobile device onto a backscatter channel of the EM radiation by modulating an impedance of the antenna of the mobile device between two or more states; and
transmitting the screen image, for display on the display terminal coupled to the base station, from the mobile device to the base station over the backscatter channel of the EM radiation.

2. The method of claim 1 , wherein the mobile device comprises one of a mobile phone, a head wearable display, a wrist watch, a body-mountable device, a body-implantable device, a tablet, or a laptop.

3. The method of claim 1 , wherein the wireless display session comprises a screen sharing session for wirelessly mirroring the screen image of the mobile device onto the display terminal.

4. The method of claim 1 , wherein the wireless display session comprises a remote display session for wirelessly conveying the screen image from the mobile device onto the display terminal, wherein the screen image is a companion image that is distinct from a primary image being displayed on a screen of the mobile device.

5. The method of claim 1 , wherein establishing the wireless display session between the mobile device and the base station comprises conveying session initiation information via a wireless side channel that does not use backscatter of the EM radiation from the base station.

6. The method of claim 5 , wherein control signaling for managing the wireless display session is conveyed via the wireless side channel while the screen image is conveyed via the backscatter channel of the EM radiation.

7. The method of claim 1 , wherein transmitting the screen image for display on the display terminal from the mobile device to the base station comprises transmitting the screen image without compressing the screen image at the mobile device prior to the transmitting.

8. The method of claim 1 , further comprising:
powering the modulation of the impedance of the antenna of the mobile device using a primary battery of the mobile device.

9. The method of claim 1 , wherein the screen image comprises an inbound video image associated with a video call, the method further comprising:
receiving the video call at the mobile device via a communication link of the mobile device that is separate from the backscatter channel; and
transmitting the inbound video image to the base station over the backscatter channel for display on the display terminal.

10. The method of claim 1 , wherein the screen image comprises a virtual desktop generated by the mobile device in real-time, the method further comprising:
communicating between the mobile device and a keyboard over a wireless side channel that does not use the backscatter channel to provide a keyboard interface with the virtual desktop,
wherein communications between the mobile device and the keyboard occur while the virtual desktop is conveyed to the display terminal via the base station over the backscatter channel.

11. The method of claim 1 , further comprising:
performing a configuration routine to identify a subset of available impedances that improve a signal-to-noise ratio (“SNR”) of the backscatter channel; and
using the identified subset of available impedances as a symbol constellation for encoding the screen image on the backscatter channel during the wireless display session.

12. The method of claim 1 , further comprising:
selecting a source for the screen image; and
coupling the source to a backscatter tag of the mobile device for transmission to the base station via the backscatter channel,
wherein the source comprises one of a memory module, a display module, or control circuitry of the mobile device.

13. At least one non-transitory machine-readable storage medium that provides instructions that, when executed by a mobile device, will cause the mobile device to perform operations comprising:
establishing a wireless display session between the mobile device and a base station coupled to a display terminal to receive electromagnetic (“EM”) radiation incident upon an antenna of the mobile device from the base station;
modulating a radar cross-section of the mobile device between two or more states;
encoding a screen image generated by the mobile device onto a backscatter channel of the EM radiation via the modulating; and
transmitting the screen image from the mobile device to the base station for display on the display terminal.

14. The at least one non-transitory machine-readable storage medium of claim 13 , wherein the wireless display session comprises a screen sharing session for wirelessly mirroring the screen image of the mobile device onto the display terminal.

15. The at least one non-transitory machine-readable storage medium of claim 13 , wherein the wireless display session comprises a remote display session for wirelessly conveying the screen image from the mobile device onto the display terminal, wherein the screen image is a companion image that is distinct from a primary image being displayed on a screen of the mobile device.

16. The at least one non-transitory machine-readable storage medium of claim 13 , wherein control signaling for managing the wireless display session is conveyed via a wireless side channel while the screen image is conveyed via the backscatter channel of the EM radiation.

17. The at least one non-transitory machine-readable storage medium of claim 13 , wherein transmitting the screen image for display on the display terminal from the mobile device to the base station comprises transmitting the screen image without compressing the screen image at the mobile device prior to the transmitting.

18. The at least one non-transitory machine-readable storage medium of claim 13 , wherein the screen image comprises an inbound video image associated with a video call, the at least one machine-accessible storage medium of claim 1 , further providing instructions that, when executed by the mobile device, will cause the mobile device to perform further operations, comprising:
receiving the video call at the mobile device via a communication link of the mobile device that is separate from the backscatter channel; and
transmitting the inbound video image to the base station over the backscatter channel for display on the display terminal.

19. The at least one non-transitory machine-readable storage medium of claim 13 , further providing instructions that, when executed by the mobile device, will cause the mobile device to perform further operations, comprising:
performing a configuration routine to identify a subset of available radar cross-sections that improve a signal-to-noise ratio (“SNR”) of the backscatter channel; and
using the identified subset of available radar cross-sections for encoding the screen image on the backscatter channel during the wireless display session.

20. A base station, comprising:
backscatter transceiver circuitry coupled to output electromagnetic (“EM”) radiation and to receive a backscatter signal of the EM radiation;
a display adapter; and
control circuitry coupled to the backscatter transceiver circuitry and the display adapter, the control circuitry including logic,

Assignees

• Google Inc
• X Dev Llc

Inventors

• Deyle Travis

Classifications

• H04B7/26

  at least one of which is mobile · CPC title

• G06F3/1454 Primary

  involving copying of the display data of a local workstation or window to a remote workstation or window so that an actual copy of the data is displayed simultaneously on two or more displays, e.g. teledisplay · CPC title

• H04B7/22 Primary

  Scatter propagation systems {, e.g. ionospheric, tropospheric or meteor scatter} · CPC title

• H04N21/43615 Primary

  Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals (home Audio Video Interoperability [HAVI] data switching networks H04L12/2805) · CPC title

• H04N21/43637

  involving a wireless protocol, e.g. Bluetooth®, RF or wireless LAN [IEEE 802.11] (arrangements for wireless networking or broadcasting of information in indoor or near-field type systems H04B10/114) · CPC title