Methods and systems for representing errors

Patent metadata

Field	Value
Publication number	US-11218980-B2
Application number	US-201816019910-A
Country	US
Kind code	B2
Filing date	Jun 27, 2018
Priority date	Sep 28, 2015
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

Disclosed are systems, devices and methods for transmission of messages between wireless transceiver devices including fields representing values such as, for example, a range between devices, time of transmission of a message or time of receipt of a previous message. In particular embodiments, message may also comprise fields to express a maximum error in values representing range, time of transmission of a message or time of receipt of a previous message.

First claim

What is claimed is:

1. A method, at a first wireless station, comprising:
synchronizing a first clock state of the first wireless station with a second clock state of a second wireless station;
determining a range between the first wireless station and the second wireless station;
determining a binary value of five or fewer bits comprising at least part of an exponent of a formula to express a maximum range error within a set of maximum range errors that spans at least from 1 m to 2000 m; and
transmitting a fine timing measurement (FTM) range report message comprising at least a range field and at least one other field, the range field indicating the range, and the at least one other field comprising the binary value.

2. The method of claim 1 , wherein the at least one other field corresponds to the maximum range error being at least as small as 0.00025 m.

3. The method of claim 1 , wherein the at least one other field corresponds to the maximum range error being at least 4096 m.

4. A non-transitory storage medium having computer-readable instructions stored thereon which are executable by a process of a first wireless station (STA) to:
synchronize a first clock state of the first wireless station with a second clock state of a second wireless station;
determine a range between the first wireless station and the second wireless station;
determine a binary value of five or fewer bits comprising at least part of an exponent of a formula to express a maximum range error within a set of maximum range errors that spans at least from 1 m to 2000 m; and
initiate transmission of a fine timing measurement (FTM) message through a wireless transmitter comprising at least a range field and at least one other field, the range field indicating the range, and the at least one other field comprising the binary value.

5. The non-transitory storage medium of claim 4 , wherein the at least one other field corresponds to the maximum range error at least as small as 0.00025 m.

6. The non-transitory storage medium of claim 4 , wherein the at least one other field corresponds to the maximum range error of at least 4096 m.

7. A first wireless station (STA), comprising:
a wireless transceiver to transmit messages to a wireless communication network; and
one or more processors coupled to the wireless transmitter, the one or more processors being configured to:
synchronize a first clock state of the first wireless station with a second clock state of a second wireless station;
determine a range between the first wireless station and the second wireless station;
determine a binary value of five or fewer bits comprising at least part of an exponent of a formula to express a maximum range error within a set of maximum range errors that spans at least from 1 m to 2000 m; and
initiate transmission of a fine timing measurement (FTM) message through the wireless transmitter comprising at least a range field and at least one other field, the range field indicating the range, and the at least one other field comprising the binary value.

8. The first STA of claim 7 , wherein the one or more processors are:
configured to determine the binary value to be equal to zero based on the maximum range error being unknown;
configured to determine the binary value to be equal to decimal 25 based on the maximum range error being greater than or equal to 4096 m; and
configured to determine the binary value to be equal to decimal N based on the maximum range error being equal to 2 N-13 wherein N is an integer between decimal one and decimal 24 , inclusive.

9. The first STA of claim 7 , wherein the at least one other field corresponds to the maximum range error at least as small as 0.00025 m.

10. The first STA of claim 7 , wherein the at least one other field corresponds to the maximum range error of at least 4096 m.

11. A first wireless station, comprising:
means for receiving one or more fine timing measurement (FTM) messages;
means for synchronizing a first clock state of the first wireless station with a second clock state of a second wireless station;
means for determining a range between the first wireless station and the second wireless station;
means for determining a binary value of five or fewer bits comprising at least part of an exponent of a formula to express a maximum range error within a set of maximum range errors that spans at least from 1 m to 2000 m; and
means for transmitting an FTM range report message based, at least in part, on the received one or more FTM messages, the FTM range report message comprising at least a range field and at least one other field, the range field indicating the range, and the at least one other field comprising the binary value.

12. The first wireless station of claim 11 , wherein the at least one other field corresponds to the maximum range error at least as small as 0.00025 m.

13. The first wireless station of claim 11 , wherein the at least one other field corresponds to the maximum range error of at least 4096 m.

14. A method, at a first wireless station, comprising:
synchronizing a first clock state of the first wireless station with a second clock state of a second wireless station;
receiving a fine timing measurement (FTM) range report message comprising at least a range field and at least one other field, the range field indicating the range, and the at least one other field comprising a binary value of five or fewer bits comprising at least part of an exponent and expressing a maximum range error in five bits or less; and
decoding the at least one other field according to a formula to determine the maximum range error within a set of maximum range errors that spans at least from 1 m to 2000 m.

15. The method of claim 14 , wherein the at least one other field corresponds to the maximum range error at least as small as 0.00025 m.

16. The method of claim 14 , wherein decoding the at least one other field to determine the maximum range error of a value between no more than 1 m and up to at least 2000 m comprises decoding the at least one other field to determine the maximum range error up to at least 4096 m.

17. A non-transitory storage medium having computer-readable instructions stored thereon which are executable by a processor of a first wireless station (STA) to:
synchronize a first clock state of the first wireless station with a second clock state of a second wireless station;
obtain a fine timing measurement (FTM) message received at a wireless receiver comprising at least a range field and at least one other field, the range field indicating the range, and the at least one other field comprising a binary value of five or fewer bits comprising at least part of an exponent and expressing a maximum range error in five bits or less; and
decode the at least one other field according to a formula to determine the maximum range error within a set of maximum range errors that spans at least from 1 m to 2000 m.

18. The non-transitory storage medium of claim 17 , wherein the instructions are further executable by the processor to decode the at least one other field to determine the maximum range error at least as small as 0.00025 m.

19. The non-transitory storage medium of claim 17 , wherein the instructions are executable by the processor to decode the at least one other field to determine the maximum range error up to at least 4096 m.

20. A first wireless station (STA), comprising:
a wireless receiver to receive messages from a wireless communication network; and
one or more

Assignees

• Qualcomm Inc

Inventors

• Aldana Carlos Horacio

Classifications

• G01S5/021

  Calibration, monitoring or correction (G01S5/0252 takes precedence) · CPC title

• H04W56/001 Primary

  Synchronization between nodes · CPC title

• H04W56/003 Primary

  Arrangements to increase tolerance to errors in transmission or reception timing · CPC title

• G01S5/0009

  Transmission of position information to remote stations (involving assistance data G01S5/0236) · CPC title

• G01S13/765

  with exchange of information between interrogator and responder · CPC title