Techniques for encoding beacon signals in wireless power delivery environments

• US 9,961,705 B2
• Filed: 12/02/2015
• Issued: 05/01/2018
• Est. Priority Date: 12/02/2014
• Status: Active Grant

• Current Assignee: Ossia, Inc.
• Original Assignee: Ossia, Inc.
• Inventors: Zeine, Hatem Ibrahim, Shylendra, Prithvi, Alfarra, Anas
• Primary Examiner(s): Hiltunen, Thomas J
• Application Number:
  US14/956,673
• Publication Number:
  US 20160156388A1
• Time in Patent Office: 881 Days
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H04L 5/0026 Division using four or more dimensions
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04W 76/14 Direct-mode setup

Abstract

Embodiments of the present disclosure describe techniques for encoding beacon signals in wireless power delivery environments. More specifically, techniques are disclosed for encoding beacon signals to isolate client devices for wireless power delivery in wireless power delivery environments. The beacon signals can be encoded or modulated with a transmission code that is provided to selected clients in the wireless power delivery environment. In this manner, beacon signals from the select clients can be identified and the corresponding client devices isolated for wireless power delivery. In some embodiments, the transmission code can be a pseudorandom sequence that is used by the wireless power delivery clients to encode transmitted beacon signals.

Claims

1. A wireless power delivery system comprising:

multiple antennas;

control circuitry operatively coupled to the multiple antennas, the control circuitry configured to;

establish a wireless communications link with client devices in a wireless power delivery environment via one or more of the multiple antennas;

process client-specific information received from the wireless devices to select a set of the client devices for power reception in the wireless power delivery environment and generate beacon transmission scheduling information, wherein the beacon transmission scheduling information includes beacon transmission scheduling assignments for the selected set of client devices; and

direct the one or more antennas to send a beacon transmission scheduling assignment and a transmission code to each of the selected set of client devices, wherein the transmission code is used to isolate signals transmitted by the selected set of client devices from each other.

2. The wireless power delivery system of claim 1, wherein the control circuitry is further configured to select a unique transmission code for each device of the selected set of client devices.

3. The wireless power delivery system of claim 2, wherein the transmission code is unique to the wireless power delivery system.

4. The wireless power delivery system of claim 1, wherein the transmission code comprises a pseudo-random sequence.

5. The wireless power delivery system of claim 1, wherein the control circuitry is further configured to:

decode a coded beacon signal received from a particular client device to determine whether the particular client device is an authorized device, wherein authorized devices are included in the selected set of client devices.

6. The wireless power delivery system of claim 5, wherein the coded beacon signal is phase-modulated based on the transmission code.

7. The wireless power delivery system of claim 6, wherein the control circuitry is further configured to:

measure phases at which the coded beacon signal is received at one or more of the multiple antennas, wherein one or more of the multiple antennas are radio frequency adaptively-phased antennas configurable to direct wireless power to individual client devices in the wireless power delivery environment;

determine or update location information corresponding to the client device based on the measured phases; and

adjust the adaptively-phased antennas to direct wireless power to the particular client.

8. The wireless power delivery system of claim 1, wherein the control circuitry is further configured to:

process the client-specific information received from the wireless devices to generate power transmission scheduling information; and

direct the one or more antennas to send the power transmission scheduling information to the selected set of client devices.

9. The wireless power delivery system of claim 1, wherein the beacon transmission scheduling information comprises a beacon beat schedule (BBS).

10. The wireless power delivery system of claim 1, wherein the beacon transmission scheduling assignments overlap.

11. A method of operating a power reception apparatus for wirelessly receiving power from a wireless power delivery system in a wireless power delivery environment, the method comprising:

establishing a wireless communications link with the wireless power delivery system;

transmitting client-specific information to the wireless power delivery system;

receiving beacon transmission scheduling information and a transmission code from the wireless power delivery system,

wherein the transmission code comprises a unique code operable to isolate signals transmitted by the power reception apparatus from other power reception apparatuses in the wireless power delivery environment;

encoding a beacon signal with the transmission code resulting in an encoded beacon signal; and

sending the encoded beacon signal to the wireless power delivery system during a beacon transmission assignment,

wherein the beacon transmission assignment is indicated by the beacon transmission scheduling information.

12. The method of claim 11, wherein the transmission code comprises a pseudo-random sequence, and wherein encoding the beacon signal comprises one or more of phase shifting the beacon signal based on the pseudo-random sequence, or modulating the beacon signal based on the pseudo-random sequence.

13. The method of claim 12, wherein encoding the beacon signal comprises phase shifting the beacon signal based on the pseudo-random sequence, and wherein the pseudo-random sequence comprises a binary number where each “

1”

of the binary number indicates a predetermined amount of phase shift and each “

0”

indicates zero phase shift.

14. The method of claim 11, further comprising:

in response to sending the encoded beacon signal, receiving wireless power from the wireless power delivery system during a power cycle assigned to the power reception apparatus.

15. The method of claim 11, wherein the client-specific information includes system information specific to a wireless device in which the power reception apparatus is embedded.

16. The method of claim 11, wherein the client-specific information includes one or more of a battery level of a wireless device in which the power reception apparatus is embedded, battery usage information of the wireless device, a battery level of the power reception apparatus, battery usage information of the power reception apparatus, information regarding a previous charge cycle, information regarding a previous charge time, information regarding a previous charger that provided power to the wireless device, priority charging information, received signal strength indication (RSSI) information, temperature information of the wireless device, or temperature information of the power reception apparatus.

17. A method of operating a wireless power delivery system for providing isolated wireless power to client devices in a wireless power delivery environment, the method comprising:

establishing a wireless communications link with the client devices in the wireless power delivery environment;

receiving client-specific information from the wireless devices;

selecting a set of the client devices for wireless power delivery;

generating beacon transmission scheduling information including beacon transmission scheduling assignments for the selected set of client devices based, at least in part, on the client-specific information;

sending a beacon transmission scheduling assignment and a transmission code to each of the selected set of client devices, wherein the transmission code is used to isolate signaling transmitted by the selected set of client devices from each other.

18. The method of claim 17, wherein the wireless power delivery system uses a unique transmission code for each client of the set of the selected set of client devices.

19. The method of claim 17, wherein the transmission code comprises a pseudo-random sequence, the method further comprising:

decoding an encoded beacon signal received from a particular client device to determine whether the particular client device is an authorized device, wherein authorized devices are included in the selected set of client devices and assigned a unique transmission code.

20. The method of claim 19, further comprising:

measuring phases at which the coded beacon signal is received at one or more of the multiple antennas, wherein one or more of the multiple antennas are radio frequency adaptively-phased antennas configurable to direct wireless power to individual client devices in the wireless power delivery environment;

determining or updating location information corresponding to the client device based on the measured phases; and

directing wireless power to the particular client.