FTM protocol with angle of arrival and angle of departure

1. A method of performing a ranging operation between an initiator device and a responder device, the method performed by the initiator device and comprising:

transmitting, to the responder device, a fine timing measurement (FTM) request frame including a request to estimate angle information for a number of frames exchanged between the initiator device and the responder device and indicating a level of accuracy for the estimated angle information;

receiving a first FTM frame from the responder device;

transmitting an acknowledgement (ACK) frame to the responder device; and

receiving, from the responder device, a second FTM frame including angle information of the first FTM frame and timing information of one or more of the exchanged frames.

2. The method of claim 1 , wherein the request is embedded within a vendor specific information element (VSIE) of the FTM request frame.

3. The method of claim 1 , wherein the angle information comprises at least one of angle of departure (AoD) information of the first FTM frame and angle of arrival (AoA) information of the ACK frame.

4. The method of claim 1 , wherein the timing information indicates a difference between a time of departure (TOD) of the first FTM frame and a time of arrival (TOA) of the ACK frame.

5. The method of claim 1 , wherein the angle information is embedded within one member of the group consisting of a time of departure (TOD) field and a time of arrival (TOA) field of the second FTM frame.

6. The method of claim 5 , wherein the timing information is embedded within the other member of the group consisting of the TOD field and the TOA field of the second FTM frame.

7. The method of claim 1 , further comprising:

receiving, from the responder device, a beacon frame containing information indicating whether the responder device is capable of estimating angle of arrival (AoA) information or angle of departure (AoD) information.

8. The method of claim 1 , further comprising:

receiving, from the responder device, a response frame indicating a level of accuracy with which the responder device is to estimate the angle information.

9. The method of claim 8 , wherein the response frame comprises the first FTM frame, and the indicated level of accuracy is embedded in an information element (IE) of the first FTM frame.

10. The method of claim 1 , wherein the angle information comprises an angle of arrival (AoA) of the ACK frame estimated using a plurality of different antenna patterns of the responder device.

11. The method of claim 1 , wherein the angle information comprises an angle of departure (AoD) of the first FTM frame estimated using a plurality of different antenna patterns of the responder device.

12. An initiator device, comprising:

one or more processors; and

a memory configured to store instructions that, when executed by the one or more processors, cause the initiator device to:

transmit, to a responder device, a fine timing measurement (FTM) request frame including a request to estimate angle information for a number of frames exchanged between the initiator device and the responder device and indicating a level of accuracy for the estimated angle information;

receive a first FTM frame from the responder device;

transmit an acknowledgement (ACK) frame to the responder device; and

receive, from the responder device, a second FTM frame including angle information of the first FTM frame and timing information of one or more of the exchanged frames.

13. The initiator device of claim 12 , wherein the request is embedded within a vendor specific information element (VSIE) of the FTM request frame.

14. The initiator device of claim 12 , wherein the angle information comprises at least one of angle of departure (AoD) information of the first FTM frame and angle of arrival (AoA) information of the ACK frame.

15. The initiator device of claim 12 , wherein the timing information indicates a difference between a time of departure (TOD) of the first FTM frame and a time of arrival (TOA) of the ACK frame.

16. The initiator device of claim 12 , wherein the angle information is embedded within one member of the group consisting of a time of departure (TOD) field and a time of arrival (TOA) field of the second FTM frame.

17. The initiator device of claim 16 , wherein the timing information is embedded within the other member of the group consisting of the TOD field and the TOA field of the second FTM frame.

18. The initiator device of claim 12 , wherein execution of the instructions further causes the initiator device to:

receive, from the responder device, a beacon frame containing information indicating whether the responder device is capable of estimating angle of arrival (AoA) information or angle of departure (AoD) information.

19. The initiator device of claim 12 , wherein execution of the instructions further causes the initiator device to:

receive, from the responder device, a response frame indicating a level of accuracy with which the responder device is to estimate the angle information.

20. The initiator device of claim 19 , wherein the response frame comprises the first FTM frame, and the indicated level of accuracy is embedded in an information element (IE) of the first FTM frame.

21. The initiator device of claim 12 , wherein the angle information comprises an angle of arrival (AoA) of the ACK frame estimated using a plurality of different antenna patterns of the responder device.

22. The initiator device of claim 12 , wherein the angle information comprises an angle of departure (AoD) of the first FTM frame estimated using a plurality of different antenna patterns of the responder device.

23. A non-transitory computer-readable storage medium comprising one or more programs containing instructions that, when executed by one or more processors of an initiator device, cause the initiator device to perform a ranging operation with a responder device by performing operations comprising:

transmitting, to the responder device, a fine timing measurement (FTM) request frame including a request to estimate angle information for a number of frames exchanged between the initiator device and the responder device and indicating a level of accuracy for the estimated angle information;

receiving a first FTM frame from the responder device;

transmitting an acknowledgement (ACK) frame to the responder device; and

receiving, from the responder device, a second FTM frame including angle information of the first FTM frame and timing information of one or more of the exchanged frames.

24. The non-transitory computer-readable storage medium of claim 23 , wherein the angle information comprises at least one of angle of departure (AoD) information of the first FTM frame and angle of arrival (AoA) information of the ACK frame.

25. The non-transitory computer-readable storage medium of claim 23 , wherein the timing information indicates a difference between a time of departure (TOD) of the first FTM frame and a time of arrival (TOA) of the ACK frame.

26. The non-transitory computer-readable storage medium of claim 23 , wherein the angle information is embedded within one member of the group consisting of a time of departure (TOD) field and a time of arrival (TOA) field of the second FTM frame.

27. The non-transitory computer-readable storage medium of claim 26 , wherein the timing information is embedded within the other member of the group consisting of the TOD field and the TOA field of the second FTM frame.

28. The non-transitory computer-readable storage medium of claim 23 , wherein the angle information comprises an angle of arrival (AoA) of the ACK frame estimated using a plurality of different antenna patterns of the responder device.

29. The non-transitory computer-readable storage medium of claim 23 , wherein the angle information comprises an angle of departure (AoD) of the first FTM frame estimated using a plurality of different antenna patterns of the responder device.

30. An initiator device, comprising:

means for transmitting, to a responder device, a fine timing measurement (FTM) request frame including a request to estimate angle information for a number of frames exchanged between the initiator device and the responder device and indicating a level of accuracy for the estimated angle information;

means for receiving a first FTM frame from the responder device;

means for transmitting an acknowledgement (ACK) frame to the responder device; and

means for receiving, from the responder device, a second FTM frame including angle information of the first FTM frame and timing information of one or more of the exchanged frames.